https://www.pcc2.net/geotechnicalgallery daily 0.75 2020-02-13 https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580172293356-9SGWKO0F91KPLTX8AL3G/HU_Health_Sc_Library.jpg Geotechnical Gallery - Science Library This modern facility in Washington, D.C. is supported on 14-inch auger cast piles designed for 70 tons in compression and 10 tons uplift. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580172293356-9SGWKO0F91KPLTX8AL3G/HU_Health_Sc_Library.jpg Geotechnical Gallery - Science Library This modern facility in Washington, D.C. is supported on 14-inch auger cast piles designed for 70 tons in compression and 10 tons uplift. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580190109932-RWOA2IX11GI6CDJBTBWV/HU_Law_Library.jpg Geotechnical Gallery - Law Library The foundations are drilled belled piers (caissons) designed for 50,000 pounds per sq. ft. end bearing plus loads of 80,000 pounds horizontal and 235,000 pounds uplift with close tolerances on lateral displacement. https://static1.squarespace.com/static/5ddef78df9af5e60887004ea/5de68dbe83bec649d370ca6d/5df013e0bcec1416d2171c26/1576014816936/ Geotechnical Gallery https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580172287952-EPOH0D2HYZCCTNW0BKC2/DC_Public_Libraries.JPG Geotechnical Gallery - Public Libraries PCC provided geotechnical design services for four modern D.C. libraries: Tenley/Friendship, Benning, Shaw and Annacostia. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580172300508-6IUZ8OT5FWNPLHSY9OKQ/Wilson-HS-7.JPG Geotechnical Gallery - Athletic Facilities This Washington, D.C. school's modern aquatic center includes an olympic size pool, diving and other facilities. It is supported on drilled piers and spread footings. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580189918968-C6IP9G405KT2LOCCY297/Clark_Building_Bethesda_Md.jpg Geotechnical Gallery - Clark Building, MD While this Bethesda, MD building was being constructed, the adjacent Bethesda Metro Complex was being planned. One wall of Clark building is supported on deep-drilled piers in order to avoid underpinning. The rest of the building is on shallow foundations. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580172465468-IUUIFG1J2YVSKK0PEZ2Q/City_Center_14th_Street_NW_Washington_DC.jpg Geotechnical Gallery - City Center, DC This 12-story building with three levels of underground garage is supported on a reinforced concrete mat foundation. The mat places an average pressure of about 4000 pounds per square foot on soft to stiff lean clay underlying the site. The mat foundation extends about 45 feet below the adjacent streets. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580172467359-BEGNTV6M4ZUD86EVEB0L/Rosedale_Apartments_Bethesda_Md.jpg Geotechnical Gallery - Apartment Bldg, Bethesda, MD O'Donnell's restaurant was replaced with three levels of underground parking that extend under the street and two roughly eight-story buildings. Spread footings are supported on a combination of weathered rock and soil for 5 to 15 ksf. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580172589218-HMQUO7LUXQ1Y7XC6R8YQ/Upper_Level_Construction_1a.jpg Geotechnical Gallery - Bethesda Triangle This 12-story apartment building has 4 levels of underground parking extending 40 feet below the street. The small brick building was underpinned to a depth of 45± feet using hand-dug concrete pits. Dispersive wave testing performed on the drilled piers supporting the taller building indicated that it did not have to be underpinned. The excavation was shored with steel soldier piles, tiebacks and temporary wood lagging. The perimeter walls were constructed as one-faced reinforced concrete walls. Columns supporting 2,000,000 pounds are supported on footings designed for 15,000 psf on disintegrated rock. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580187734469-JH32DJDASQKR63MHP8HT/16th_Street_NW_Washington_DC.jpg Geotechnical Gallery - 16th Street NW This residential building in Washington, DC is supported on typical spread footings. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580187579984-5P56IRI5P6JX5E8CNJ9A/13th_Street_NW_Washington_DC.jpg Geotechnical Gallery - 13th Street, NW This is a typical Washington, DC building with three+ levels of parking below street level. This one is supported on normal spread footings. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580188078044-Q3ZCO75XBKJKEGU7RMFW/Benington_Apartments_Crystal_City_Va.jpg Geotechnical Gallery - Apartment Building, VA This building in Crystal City, VA is supported on drilled piers (caissons) with bells excavated in high plasticity pre-consolidated clay. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580188202184-TUIO77GGQ7LVFMU3INM7/Bethesda_Metro_Complex_Bethesda_Md.jpg Geotechnical Gallery - Bethesda Meto Complex Three buildings are supported above a large underground garage. Part of the structure is supported on small-diameter, heavily reinforced piers socketed into rock below the subway. The rest is on normal spread footings. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580256997141-JSYDMQNJ9UWHB1TD4YJ3/image-asset.jpeg Geotechnical Gallery - Storm Water Management This pond is created by a concrete flood wall instead of an earth dam. https://www.pcc2.net/retaining-walls-gallery daily 0.75 2020-02-13 https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580366878674-ELIEEFV1XY6RTQ3ST0WE/Beam+and+Gunite+Wall.JPG Retaining Walls Gallery - Beam and Gunite Wall Steel pile wall with gunite facing behind a stone gravity wall https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580366878674-ELIEEFV1XY6RTQ3ST0WE/Beam+and+Gunite+Wall.JPG Retaining Walls Gallery - Beam and Gunite Wall Steel pile wall with gunite facing behind a stone gravity wall https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1576015406779-GX724Q70MPCX5AHRFZD8/5-SRW.JPG Retaining Walls Gallery - Segmental Wall PCC designed and monitored construction of this 34-ft. tall geogrid-reinforced Keystone wall. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1576015297534-YH9EJE1SUUBDTQUC7CIQ/8-Soil+Nail+Walls.JPG Retaining Walls Gallery - Soiled Nailed Wall The sides of this quarry are stabilized with soil nailed walls with artistically carved and colored shot crete facing. The total height is 75 feet with individual walls of 10 to 40 feet in height. PCC worked for the design-build wall contractor on this site. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1576015130965-QI8B9J3KDXCCE0974L01/1-Tiebacks.jpg Retaining Walls Gallery https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1576015268099-DC475IXS6U7IWZJYYX2Z/13-Concrete.jpg Retaining Walls Gallery - Reinforced Concrete Wall Reinforced concrete and masonry retaining walls generally have good longevity. The reinforcing can get complex and expensive even in a relatively small height wall. This is the foundation of a 2-tiered closely spaced concrete wall that PCC designed and monitored. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580278767555-DN18BS9VUF27JP3BHZPG/12-Cantilever_Pile.jpg Retaining Walls Gallery - Cantilever Pile Wall This building is supported on top of a wall that is acting as a retaining structure. The wall is made with steel cantilever piles and cast-in-place concrete facing. PCC, working for the developer, assisted the contractor in design and provided construction monitoring. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580366275004-EWTRSG5NANI4L0193F6J/MSE+Wall+30+feet+tall.JPG Retaining Walls Gallery - MSE Wall 34-feet-tall Mechanically Stabilized Element (MSE) wall https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580366459117-MVHFBIJIF6OHG3OYPRMI/Steel+Beam+and+Timber+Wall.JPG Retaining Walls Gallery - Beam and Timber Wall This PCC uniquely designed wood wall is over 30 years old and looks almost new. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580366519663-VQZO7B4J4GNP9CX6OHLA/Stone+Gravity+Wall.JPG Retaining Walls Gallery - Stone Gravity Wall https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1581290398351-TE42LOLYP9AL1JMEZJ43/new+retaining+wall.jpg Retaining Walls Gallery - Beam & SRW facing This wall is designed with steel piles and Segmental Retaining Wall (SRW) facing, which is less expensive than concrete facing. https://www.pcc2.net/new-index daily 0.75 2020-01-30 https://www.pcc2.net/shoring-systems daily 0.75 2020-02-13 https://static1.squarespace.com/static/5ddef78df9af5e60887004ea/t/5e45acf342b9dc4a2c0b6183/1580257406560/ Shoring Systems Gallery - Temporary Support This system is common in the DC Metro area. It includes a steel soldier pile with tiebacks and wood lagging. The foundation walls of below-ground parking structures may be constructed as one-faced reinforced concrete walls. Design of the wall drainage system is a big factor in the design. https://static1.squarespace.com/static/5ddef78df9af5e60887004ea/5e18d1226dd985384acfaee2/5e30d056f9097826d3574ed2/1580257406560/ Shoring Systems Gallery - Temporary Support This system is common in the DC Metro area. It includes a steel soldier pile with tiebacks and wood lagging. The foundation walls of below-ground parking structures may be constructed as one-faced reinforced concrete walls. Design of the wall drainage system is a big factor in the design. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1581623546705-W83TFP1HD5HCLEFIWMOL/Excavation_%26_tiebacks_in_progress.jpg Shoring Systems Gallery - Temporary Support This system is common in the DC Metro area. It includes steel soldier piles with tiebacks and wood lagging. The foundation walls of below-ground parking structures may be constructed as one-faced reinforced concrete walls. Design of the wall drainage system is a big factor in the design. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580257758608-704IG9U1OLX8BEQ2JC5N/image-asset.jpeg Shoring Systems Gallery - Temporary Bracing This type of system uses a steel soldier piles with cross-lot struts and wood lagging. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1582738849608-B20ROUIH5IO1NXWGCTV4/3-SheetPile2.jpg Shoring Systems Gallery - Sheet Piles Sheet piles are used in soft ground conditions. This excavation is about half down and will extend well below groundwater for installation of a tunnel. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580269336315-EEMPJTZF4MG79PLZAFGN/image-asset.jpeg Shoring Systems Gallery - Slurry Wall Slurry walls are used to provide temporary support and as permanent below-grade walls. They are more expensive, but the stiffer system minimizes damage to adjacent buildings. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580365188482-12Y9RP1MEP64Z3AE30C9/image-asset.jpeg Shoring Systems Gallery - Temporary Support This system is common in the DC Metro area. It includes steel soldier piles with tiebacks and wood lagging. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1581623624124-7CGOM80GMEHHQ2E9V2Y2/Lower_Level_Columns_%26_Underpinning.jpg Shoring Systems Gallery - Conventional Underpinning Hand dug underpinning pits with tiebacks are sometimes used instead of steel piles with brackets. https://www.pcc2.net/forensics-landslides daily 0.75 2020-02-13 https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580361056104-Y0JL71Z8TFK35H5MYIDJ/image-asset.jpeg Forensics & Landslides Gallery - Pile Wall Failure and Landslide PCC designed a tieback retaining wall concept to stabilize a landslide that destroyed an existing steel pile and wood retaining wall, and threatened the house located above the wall. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580361056104-Y0JL71Z8TFK35H5MYIDJ/image-asset.jpeg Forensics & Landslides Gallery - Pile Wall Failure and Landslide PCC designed a tieback retaining wall concept to stabilize a landslide that destroyed an existing steel pile and wood retaining wall, and threatened the house located above the wall. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580361253273-C0J0VNTXSY5BYGGJIELQ/image-asset.jpeg Forensics & Landslides Gallery - Failed MSE Wall PCC designed a new Mechanically Stabilized Element (MSE) wall to replace a wall that failed and destroyed this parking lot. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580269532905-VMKJN39HYNNFYET3EGTR/image-asset.jpeg Forensics & Landslides Gallery - Permacrib Wall Repair The wood facing on this wall was pulling apart. PCC provided geotechnical exploration and consulting to the structural engineer. We have worked on several other types of walls that are not common to the Metro area. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580269723600-VDW6EJYEDF4KJHLZLVCF/image-asset.jpeg Forensics & Landslides Gallery - Timber Retaining Wall Timber retaining walls may be less expensive to construct, but the useful life depends on the design, construction and subsurface conditions. Walls like this need to be replaced. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580351646875-KRR49157SWIN6WJ0ZHNI/IMG_3302+%281%29.jpg Forensics & Landslides Gallery - Garage Wall Stabilization PCC designed a tieback wall and drainage relief system to stabilize this garage wall. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580269800495-VBMZP3ER6VXL858FCRGV/image-asset.jpeg Forensics & Landslides Gallery - Basement Walls Basement walls need to be designed to resist earth and sometimes water pressure. PCC has been involved in the repair or replacement of below grade walls on many projects. In this example, the wall was completely removed and replaced. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580279582590-3GTV7G3VH4F82GVF0FRX/image-asset.jpeg Forensics & Landslides Gallery - Building Stabilization PCC has designed and monitored numerous building stabilizations using multiple types of micropiles. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580362071912-88VF85SJ91AVYJVY7SD4/image-asset.jpeg Forensics & Landslides Gallery - Settlement Damage PCC uses surveying and monitoring to evaluate rate of settlement damage. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580362273765-ACKFBMKXHSUHXGIG23RC/Fox_Chase_3a.JPG Forensics & Landslides Gallery - Landslide PCC designed landslide stabilization using counter balancing berms and sub-drains, which were much less expensive than retaining structures for this project in Virginia. PCC also monitored construction. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580364382598-YX1SCD6JD52QWQ13HSSQ/image-asset.jpeg Forensics & Landslides Gallery - Sinkhole These sinkholes were repaired with grouting. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1581626087721-FRL965UVIV6LDT8B7KGM/Adams_Dr_2.jpg Forensics & Landslides Gallery - Slope Stabilization PCC analyzed slope and developed plans to prevent a house from sliding down a near vertical slope of 50 feet into a creek. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580365040625-GLR50POBNLK9U89R8UJQ/image-asset.jpeg Forensics & Landslides Gallery - Slope Stabilization This unstable slope has been remediated using rip-rap along the water; a tieback concrete retaining wall near the top of the slope; and underpinning of the house. PCC did the design, construction drawings and construction monitoring. It has been stable for over 10 years. https://www.pcc2.net/geology daily 0.75 2020-02-01 https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580589517247-YIDI68GG60DI1B9G0JFO/geoc256.jpg Local Geology - Generalized Geologic Map of Maryland Source: Maryland Geological Survey https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580590304554-GNFXBJ7ZYLB3PXY42NOI/Geology_Map_Of_Mid_Atlantic+-+large.jpg Local Geology - Generalized Geologic Map of Mid-Atlantic States https://www.pcc2.net/how-we-do-it daily 0.75 2020-03-09 https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1579715032690-KWE33ATMOY6Y0D8E88YG/SDC12302.JPG How We Do It Helical Pier Tiebacks https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1579714956966-BGP5CHYG136BT18VWF2W/hlthsciloadtest.JPG How We Do It Pile Load Test https://www.pcc2.net/what-we-do daily 0.75 2020-01-23 https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1579714267339-CXUFG7SPE8NUCRRD7ERP/14-SDC12311.jpg What We Do https://www.pcc2.net/home daily 1.0 2020-02-20 https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1577306603507-UJ1C6Q5R2LU95E0WB7BP/12-Cantilever_Pile.jpg Home - About PCC provides design, construction and forensics services for residential, commercial, private, public and government projects. From pre-purchase and design through construction and post-construction phases, our staff provides exceptional customer service every step of the way. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1577306293854-A73QXY2TEFVJG4D91KNH/IMG_3594+%281%29.jpg Home - Get Started Contact us for a customized proposal to meet your needs. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580277186186-KCMEQFJO4NPYEACEPYUK/RiverRd_2_SDC11596.jpg Home https://www.pcc2.net/geotechnical daily 0.75 2020-02-13 https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580172293356-9SGWKO0F91KPLTX8AL3G/HU_Health_Sc_Library.jpg Geotechnical - Science Library This modern facility in Washington, D.C. is supported on 14-inch auger cast piles designed for 70 tons in compression and 10 tons uplift. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580190109932-RWOA2IX11GI6CDJBTBWV/HU_Law_Library.jpg Geotechnical - Law Library The foundations are drilled belled piers (caissons) designed for 50,000 pounds per sq. ft. end bearing plus loads of 80,000 pounds horizontal and 235,000 pounds uplift with close tolerances on lateral displacement. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580172287952-EPOH0D2HYZCCTNW0BKC2/DC_Public_Libraries.JPG Geotechnical - Public Libraries PCC provided geotechnical design services for four modern D.C. libraries: Tenley/Friendship, Benning, Shaw and Annacostia. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580172300508-6IUZ8OT5FWNPLHSY9OKQ/Wilson-HS-7.JPG Geotechnical - Athletic Facilities This Washington, D.C. school's modern aquatic center includes an olympic size pool, diving and other facilities. It is supported on drilled piers and spread footings. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580189918968-C6IP9G405KT2LOCCY297/Clark_Building_Bethesda_Md.jpg Geotechnical - Clark Building, MD While this Bethesda, MD building was being constructed, the adjacent Bethesda Metro Complex was being planned. One wall of Clark building is supported on deep-drilled piers in order to avoid underpinning. The rest of the building is on shallow foundations. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580172465468-IUUIFG1J2YVSKK0PEZ2Q/City_Center_14th_Street_NW_Washington_DC.jpg Geotechnical - City Center, DC This 12-story building with three levels of underground garage is supported on a reinforced concrete mat foundation. The mat places an average pressure of about 4000 pounds per square foot on soft to stiff lean clay underlying the site. The mat foundation extends about 45 feet below the adjacent streets. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580172467359-BEGNTV6M4ZUD86EVEB0L/Rosedale_Apartments_Bethesda_Md.jpg Geotechnical - Apartment Bldg, Bethesda, MD O'Donnell's restaurant was replaced with three levels of underground parking that extend under the street and two roughly eight-story buildings. Spread footings are supported on a combination of weathered rock and soil for 5 to 15 ksf. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580172589218-HMQUO7LUXQ1Y7XC6R8YQ/Upper_Level_Construction_1a.jpg Geotechnical - Bethesda Triangle This 12-story apartment building has 4 levels of underground parking extending 40 feet below the street. The small brick building was underpinned to a depth of 45± feet using hand-dug concrete pits. Dispersive wave testing performed on the drilled piers supporting the taller building indicated that it did not have to be underpinned. The excavation was shored with steel soldier piles, tiebacks and temporary wood lagging. The perimeter walls were constructed as one-faced reinforced concrete walls. Columns supporting 2,000,000 pounds are supported on footings designed for 15,000 psf on disintegrated rock. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580187734469-JH32DJDASQKR63MHP8HT/16th_Street_NW_Washington_DC.jpg Geotechnical - 16th Street NW This residential building in Washington, DC is supported on typical spread footings. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580187579984-5P56IRI5P6JX5E8CNJ9A/13th_Street_NW_Washington_DC.jpg Geotechnical - 13th Street, NW This is a typical Washington, DC building with three+ levels of parking below street level. This one is supported on normal spread footings. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580188078044-Q3ZCO75XBKJKEGU7RMFW/Benington_Apartments_Crystal_City_Va.jpg Geotechnical - Apartment Building, VA This building in Crystal City, VA is supported on drilled piers (caissons) with bells excavated in high plasticity pre-consolidated clay. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580188202184-TUIO77GGQ7LVFMU3INM7/Bethesda_Metro_Complex_Bethesda_Md.jpg Geotechnical - Bethesda Meto Complex Three buildings are supported above a large underground garage. Part of the structure is supported on small-diameter, heavily reinforced piers socketed into rock below the subway. The rest is on normal spread footings. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580256997141-JSYDMQNJ9UWHB1TD4YJ3/image-asset.jpeg Geotechnical - Storm Water Management This pond is created by a concrete flood wall instead of an earth dam. https://www.pcc2.net/shoringsystems daily 0.75 2020-02-26 https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1581623546705-W83TFP1HD5HCLEFIWMOL/Excavation_%26_tiebacks_in_progress.jpg Shoring Systems - Temporary Support This system is common in the DC Metro area. It includes steel soldier piles with tiebacks and wood lagging. The foundation walls of below-ground parking structures may be constructed as one-faced reinforced concrete walls. Design of the wall drainage system is a big factor in the design. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580257758608-704IG9U1OLX8BEQ2JC5N/image-asset.jpeg Shoring Systems - Temporary Bracing This type of system uses a steel soldier piles with cross-lot struts and wood lagging. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1582738849608-B20ROUIH5IO1NXWGCTV4/3-SheetPile2.jpg Shoring Systems - Sheet Piles Sheet piles are used in soft ground conditions. This excavation is about half down and will extend well below groundwater for installation of a tunnel. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580269336315-EEMPJTZF4MG79PLZAFGN/image-asset.jpeg Shoring Systems - Slurry Wall Slurry walls are used to provide temporary support and as permanent below-grade walls. They are more expensive, but the stiffer system minimizes damage to adjacent buildings. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580365188482-12Y9RP1MEP64Z3AE30C9/image-asset.jpeg Shoring Systems - Temporary Support This system is common in the DC Metro area. It includes steel soldier piles with tiebacks and wood lagging. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1581623624124-7CGOM80GMEHHQ2E9V2Y2/Lower_Level_Columns_%26_Underpinning.jpg Shoring Systems - Conventional Underpinning Hand dug underpinning pits with tiebacks are sometimes used instead of steel piles with brackets. https://www.pcc2.net/contact daily 0.75 2023-11-06 https://www.pcc2.net/project-spotlights daily 0.75 2020-02-20 https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1581618979522-559P0R1IDXZXWASWCDZD/Pile%2BDrilling%2B1.jpg Project Spotlights https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1581619774205-04YLTQGRDD873IQP74WT/After+2.jpg Project Spotlights https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1582165612578-M63WMHYQBK4TR6JQXS43/After+3.jpg Project Spotlights https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1582164678130-TU4U7PFYFU13EX26QYW7/Before%252B2.jpg Project Spotlights https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1581628320263-OR95J3EGA03IHXUVFR6R/Tiebacks.jpg Project Spotlights https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580192025719-1FPH0A4R5RWZEF7PF92I/Upper_Level_Construction_1a.jpg Project Spotlights https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580192050132-RY08QYLDDRWBAHX3M18M/Upper_Level_Construction_2a.jpg Project Spotlights https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580192026564-2PFEHBRAAY6545DMXYT4/Excavation_%26_tiebacks_in_progress.jpg Project Spotlights https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1581619062698-OI4TZ2CYHM10ECC05FJ9/Pile%2BDrilling%2B2.jpg Project Spotlights https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1581619437846-XA73I45DIR8X8C4I610I/After+1.jpg Project Spotlights https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1582165221646-UP004I6OL8HTR9I7EEDT/After+4.jpg Project Spotlights https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1582164648269-G59BYQUGHXGCBL1FLJA2/case%252Bstudy%252Bimage.jpg Project Spotlights https://www.pcc2.net/our-team daily 0.75 2022-01-16 https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580163313277-ZH07MY9DEWWU1KXPZ1CA/bazaart1+%281%29.jpeg Our Team https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580163150528-2OPY4QC8TXYK3ZHT4R5V/IMG_0967.JPG Our Team https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580163232047-8PC1DHUJRVALW8LA1CQH/IMG_0969.JPG Our Team https://www.pcc2.net/forensicsandlandslides daily 0.75 2020-01-30 https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580361056104-Y0JL71Z8TFK35H5MYIDJ/image-asset.jpeg Forensics and Landslides - Pile Wall Failure and Landslide PCC designed a tieback retaining wall concept to stabilize a landslide that destroyed an existing steel pile and wood retaining wall, and threatened the house located above the wall. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580361253273-C0J0VNTXSY5BYGGJIELQ/image-asset.jpeg Forensics and Landslides - Failed MSE Wall PCC designed a new Mechanically Stabilized Element (MSE) wall to replace a wall that failed and destroyed this parking lot. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580269532905-VMKJN39HYNNFYET3EGTR/image-asset.jpeg Forensics and Landslides - Permacrib Wall Repair The wood facing on this wall was pulling apart. PCC provided geotechnical exploration and consulting to the structural engineer. We have worked on several other types of walls that are not common to the Metro area. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580269723600-VDW6EJYEDF4KJHLZLVCF/image-asset.jpeg Forensics and Landslides - Timber Retaining Wall Timber retaining walls may be less expensive to construct, but the useful life depends on the design, construction and subsurface conditions. Walls like this need to be replaced. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580351646875-KRR49157SWIN6WJ0ZHNI/IMG_3302+%281%29.jpg Forensics and Landslides - Garage Wall Stabilization PCC designed a tieback wall and drainage relief system to stabilize this garage wall. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580269800495-VBMZP3ER6VXL858FCRGV/image-asset.jpeg Forensics and Landslides - Basement Walls Basement walls need to be designed to resist earth and sometimes water pressure. PCC has been involved in the repair or replacement of below grade walls on many projects. In this example, the wall was completely removed and replaced. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580279582590-3GTV7G3VH4F82GVF0FRX/image-asset.jpeg Forensics and Landslides - Building Stabilization PCC has designed and monitored numerous building stabilizations using multiple types of micropiles. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580362071912-88VF85SJ91AVYJVY7SD4/image-asset.jpeg Forensics and Landslides - Settlement Damage PCC uses surveying and monitoring to evaluate rate of settlement damage. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580362273765-ACKFBMKXHSUHXGIG23RC/Fox_Chase_3a.JPG Forensics and Landslides - Landslide PCC designed landslide stabilization using counter balancing berms and sub-drains, which were much less expensive than retaining structures for this project in Virginia. PCC also monitored construction. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580364382598-YX1SCD6JD52QWQ13HSSQ/image-asset.jpeg Forensics and Landslides - Sinkhole These sinkholes were repaired with grouting. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1581626087721-FRL965UVIV6LDT8B7KGM/Adams_Dr_2.jpg Forensics and Landslides - Slope Stabilization PCC analyzed slope and developed plans to prevent a house from sliding down a near vertical slope of 50 feet into a creek. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580365040625-GLR50POBNLK9U89R8UJQ/image-asset.jpeg Forensics and Landslides - Slope Stabilization This unstable slope has been remediated using rip-rap along the water; a tieback concrete retaining wall near the top of the slope; and underpinning of the house. PCC did the design, construction drawings and construction monitoring. It has been stable for over 10 years. https://www.pcc2.net/retainingwalls daily 0.75 2020-02-13 https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580366878674-ELIEEFV1XY6RTQ3ST0WE/Beam+and+Gunite+Wall.JPG Retaining Walls - Beam and Gunite Wall Steel pile wall with gunite facing behind a stone gravity wall https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1576015406779-GX724Q70MPCX5AHRFZD8/5-SRW.JPG Retaining Walls - Segmental Wall PCC designed and monitored construction of this 34-ft. tall geogrid-reinforced Keystone wall. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1576015297534-YH9EJE1SUUBDTQUC7CIQ/8-Soil+Nail+Walls.JPG Retaining Walls - Soiled Nailed Wall The sides of this quarry are stabilized with soil nailed walls with artistically carved and colored shot crete facing. The total height is 75 feet with individual walls of 10 to 40 feet in height. PCC worked for the design-build wall contractor on this site. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1576015268099-DC475IXS6U7IWZJYYX2Z/13-Concrete.jpg Retaining Walls - Reinforced Concrete Wall Reinforced concrete and masonry retaining walls generally have good longevity. The reinforcing can get complex and expensive even in a relatively small height wall. This is the foundation of a 2-tiered closely spaced concrete wall that PCC designed and monitored. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580278767555-DN18BS9VUF27JP3BHZPG/12-Cantilever_Pile.jpg Retaining Walls - Cantilever Pile Wall This building is supported on top of a wall that is acting as a retaining structure. The wall is made with steel cantilever piles and cast-in-place concrete facing. PCC, working for the developer, assisted the contractor in design and provided construction monitoring. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580366275004-EWTRSG5NANI4L0193F6J/MSE+Wall+30+feet+tall.JPG Retaining Walls - MSE Wall 34-feet-tall Mechanically Stabilized Element (MSE) wall https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580366459117-MVHFBIJIF6OHG3OYPRMI/Steel+Beam+and+Timber+Wall.JPG Retaining Walls - Beam and Timber Wall This PCC uniquely designed wood wall is over 30 years old and looks almost new. https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1580366519663-VQZO7B4J4GNP9CX6OHLA/Stone+Gravity+Wall.JPG Retaining Walls - Stone Gravity Wall https://images.squarespace-cdn.com/content/v1/5ddef78df9af5e60887004ea/1581290398351-TE42LOLYP9AL1JMEZJ43/new+retaining+wall.jpg Retaining Walls - Beam & SRW facing This wall is designed with steel piles and Segmental Retaining Wall (SRW) facing, which is less expensive than concrete facing. https://www.pcc2.net/home-alt-bedford daily 0.75 2025-05-12 https://images.squarespace-cdn.com/content/v1/52a74d9ae4b0253945d2aee9/1390500612440-PGQSIY8KL9F7T5VIXQLO/chambers-2.jpg Home Alt A better world Starts with a choice Contact Us https://images.squarespace-cdn.com/content/v1/52a74d9ae4b0253945d2aee9/1390500503574-5BAPXZO9U06UV61P49UO/chambers1.jpg Home Alt Sustainability Starts with you Join Us https://images.squarespace-cdn.com/content/v1/52a74d9ae4b0253945d2aee9/1390500933384-LII4SRIPHFYOUFX0UCXC/chambers-4.jpg Home Alt A better world Starts with a choice Join Us https://images.squarespace-cdn.com/content/v1/52a74d9ae4b0253945d2aee9/1390504287124-HQ8GNX1JCE22V047MSQ9/chambers-8.jpg Home Alt Preserve Nature Join Us