Foundation pit engineering - foundation pit support engineering - enclosure construction - foundation pit enclosure - QiangJin Foundation

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Foundation pit engineering

Foundation pit engineering

Enclosure structure and support structure adopted to excavate the earthwork within the scope of the underground structure of the building, ensure the smooth construction of the underground structure of the building, and protect the safety of the existing municipal roads, pipelines and buildings (structures) outside the foundation pit General term for engineering measures such as , precipitation, reinforcement, excavation and backfilling, including engineering survey, geotechnical design, construction, testing and monitoring during construction.

: Master core technology

Many innovative technologies, such as prestressed fish-belly foundation pit steel structure technology, intelligent piling technology, are lower in cost, shorter in duration and better in quality than traditional technology.

: Technology research and development capability

It has obtained 140 authorized patents, including 73 utility model patents and 6 design patents.New technology replaces traditional technology.

: Equipment development capability

The well-known innovation team in the industry has improved and researched and developed special equipment. The existing construction equipment has more than 100 sets. The process is reliable and the construction is efficient.

: Differential competitive advantage

Technology driven + perfect management + self-implementation enterprise, 4 offshore construction ships, more than 30,000 tons of prefabricated steel components.

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Construction Technology

Prestressed fish-belly type foundation pit steel support technology

: Prestressed fish-belly type foundation pit steel support technology

It has the characteristics of large space, high rigidity, strong stability, small deformation and convenient construction. Compared with the traditional internal support, it can shorten the construction period and reduce the cost. It has been successfully used in more than 100 projects in Shanghai, Jiangsu, Zhejiang, Guangdong, Anhui, Shandong, Beijing, Hubei, Jiangxi, Yunnan and other places, with an excavation depth of 22 meters. Editor-in-chief of provincial construction methods and national regulations.
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Undisturbed soil borrowing cast-in-place pile technology

: Undisturbed soil borrowing cast-in-place pile technology

This technology is suitable for retaining pile construction of foundation pit engineering, the pile length can reach more than 30 meters, the use of special equipment to take out the original soil immediately after pouring concrete, inserted into the steel cage, the formation of reinforced concrete pile.Eliminate mud discharge, reduce project cost, green environmental protection.It is also the construction solution adopted after the provision of "No. 645 of Shanghai Diplomatic Relations (2012)" that "GPS type bored pile machinery shall not be used for construction of bored pile with diameter more than 1 meter".
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SMW engineering technology

: SMW engineering technology

Strong seepage and water stop, its permeability coefficient K can reach 10 cm/s.Continuous integrity between piles, no joint.The maximum depth of the wall is up to 65 meters, and the thickness of the wall is 650-1000mm. It is suitable for soft and super hard strata such as silt, clay, silt, sand, gravel, strong weathering and moderate weathering, and overcomes the defects of the traditional two-axis mixing pile, such as small penetration force.
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CSM engineering technology

: CSM engineering technology

CSM method is Cutter Soil Mixing (milling) deep Mixing technology, the technology by double rotary cutting on the construction site of the original state Soil, at the same time into cement slurry and gas formation thickness of cement Soil under continuous wall, used for water stop curtain, retaining wall or formation improvement, with formation adaptability is strong, the construction speed is quick,High quality wall, especially suitable for complex strata.
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TRD engineering technology

: TRD engineering technology

The TRD method is to insert the cutting box with cutting chain and cutter head into the ground to the designed depth, and inject cement slurry into the soil while cutting vertically and pushing laterally into the groove, so that the cement slurry can be cut and stirred with the original soil to form the continuous wall under the cement soil with equal thickness, which is suitable for clay, sand and other soil layers.
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Occlusal pile technology

: Occlusal pile technology

TRD first adopts a spacer soil-cement mixing pile machine to construct soil-cement piles, and then uses a dual-power drill with spiral blades built into the full supporting cylinder to cut the diameter of the piles in a tubular manner. Then, the concrete is poured or pressed and vibrated to form the foundation pit retaining pile closely interlocking with soil-cement piles, which has the dual functions of water stop and soil retaining.
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1-6 axis cement-soil mixing pile technology

: 1-6 axis cement-soil mixing pile technology

1-6 axis cement-soil mixing pile technology inherits the advantages of uniaxial mixing pile with good pile formation effect, biaxial (uniaxial) mixing pile with less soil displacement, small water-cement ratio, high pile strength, good soil reinforcement effect and low cost.It overcomes the defects of low work efficiency, poor stability, low degree of automation and high labor intensity of biaxial (uniaxial) mixing pile.The defects of high cost, large amount of displaced soil and low strength of soil-cement were eliminated.
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Bored pile technology

: Bored pile technology

The bored pile with mud wall protection is a pile formed by slowly drilling with a pile machine under the condition of mud wall protection, taking out the drilling slag with mud, and protecting the hole wall from collapse. After the hole is formed, the mud is replaced by underwater concrete pouring. During construction, it has the advantages of no vibration, no soil compaction, low noise, and is suitable for use in urban areas with dense buildings. It is widely used in foundation pit retaining piles.
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Stiffening pile technology

: Stiffening pile technology

The rotary jet mixing stiffening pile is a kind of oblique cement soil stiffening anchor formed by combining the rotary jet mixing and mixing cement soil technology, and combining the prestress and soil reinforcement technology. During the pile forming process, the soil around the pile is cut, mixed, infiltrated, squeezed and replaced, so that the strength of the slope soil is greatly improved; Under the action of prestressed anchor bars, the stress state of slope soil is improved, and the bearing capacity and stability of slope soil are improved.
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High pressure jet grouting pile technology

: High pressure jet grouting pile technology

High pressure jet grouting is a kind of high-pressure jet grouting method, which is to insert the grouting pipe with special nozzle into the designed soil depth, and then inject the cement slurry from the nozzle in the form of high-pressure flow to impact and cut the soil. The soil mass and the cement slurry are mixed to form a mixed slurry to form a continuous overlapping cement plus solid.
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Traditional steel support technology

: Traditional steel support technology

The traditional steel support refers to the use of steel pipes, H-shaped steel, angle steel, etc. to enhance the stability of engineering structures. Generally, it is inclined connecting members, and the most common are herringbone and cross shapes. Steel bracing is widely used in subway and foundation pit support. Because the steel support can be recycled, it has the characteristics of economy and environmental protection.
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Traditional concrete support technology

: Traditional concrete support technology

The internal support of foundation pit refers to the retaining, reinforcement and protection measures adopted for the side wall and the surrounding environment of the foundation pit to ensure the safety of the underground structure construction and the surrounding environment of the foundation pit. Reinforced concrete internal support is a common form of foundation pit internal support. The reinforced concrete beam and slab structure are poured to form a whole with the vertical retaining structure around the foundation pit, and the bearing column is installed at the intersection of the support beam.
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