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

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.

Construction Technology

Prestressed fish-belly type foundation pit steel support technology

The high-rigidity and high-stability structural system effectively improves the safety of the foundation pit, and the high-precision process requires strict control of the foundation pit deformation, which greatly reduces the impact of the development and construction of underground space on the surrounding buildings (structures), municipal road pipelines and other environments.

Undisturbed soil borrowing cast-in-place pile technology

This technology is suitable for the construction of supporting piles in foundation pit projects. The length of the piles can reach more than 30 meters. After taking out the undisturbed soil with special equipment, concrete is poured immediately, and the reinforcement cages are inserted to form reinforced concrete piles.

SMW construction technology

It has strong anti-seepage and water resistance, and its permeability coefficient K can reach 10 cm/s. The piles are continuous and complete without joints. It has strong mixing ability to form a wall, the maximum depth of the wall can reach 65 meters, and the thickness of the wall is 650-1000mm. The traditional two-axis mixing pile has the defects of low drilling penetration and other defects.

CSM construction technology

CSM construction method is the abbreviation of Cutter Soil Mixing (milling deep mixing technology), which cuts the undisturbed soil at the construction site through double-wheel rotation, and injects cement slurry and gas at the same time to form an equal-thickness cement soil underground diaphragm wall, which is used to stop water Curtain, retaining wall or stratum improvement, has the characteristics of strong stratum adaptability, fast construction speed and high wall quality, especially suitable for complex strata.

TRD construction technology

The TRD construction method is to insert a cutting box with a cutting chain and a cutter head into the ground to the design depth, and while longitudinally cutting and horizontally pushing it into a groove, inject cement slurry into the soil to make it cut and stir with the undisturbed soil to form, etc. Underground diaphragm wall for thick cement soil, suitable for soil layers such as clay and sand.

bite post technique

First, use a mixing pile driver with a cage-type double-layer agitator to construct the solidified soil pile, and then use the undisturbed soil borrowing and grouting concrete pile driver to cut adjacent solidified soil piles to form holes, press concrete and insert the reinforcement cage to form an occlusal foundation pit support. The protective structure has the dual functions of water stop and soil retention.

1-6 axis cement-soil mixing pile technology

The 1-6-axis cement-soil mixing pile technology inherits the good pile forming effect of the single-axis mixing pile, the less soil displacement of the double-axis (single-axis) mixing pile, the small water-cement ratio, the high strength of the pile body, and the good soil reinforcement effect. , low cost, etc.; it overcomes the defects of low efficiency of double-shaft (single-shaft) mixing pile, poor stability of pile driver, low degree of automation, and high labor intensity; eliminates the high cost of three-shaft mixing pile, large amount of soil replacement, cement Defects such as low soil strength.

Bored pile technology

The mud wall-forming hole-in-situ pile is drilled slowly by the pile driver under the condition of mud wall protection, and the drilling slag is taken out by the mud, and the hole wall is protected from collapse. After the hole is formed, the mud is replaced by the method of underwater concrete pouring. formed pile. It has the advantages of no vibration, no soil extrusion, low noise, and suitable for use in dense urban buildings, and is widely used in foundation pit enclosure piles.

Stiffening pile technology

Rotary jetting and stirring stiffening pile is a kind of oblique cement-soil stiffening anchor body formed by combining rotary jetting and stirring cement-soil technology, and combining prestressing and soil reinforcement technology. Stirring, infiltration, extrusion and replacement can greatly improve the strength of the slope soil; under the action of prestressed anchor bars, the stress state of the slope soil is improved, and the bearing capacity and stability of the slope soil are improved. sex.

High pressure spray pile technology

High-pressure jet grouting is a kind of high-pressure jet grouting method. A grouting pipe with a special nozzle is inserted into the designed soil depth, and then the cement slurry is ejected from the nozzle in the form of high-pressure flow to impact and cut the soil. The soil mass and the cement slurry are stirred to form a mixed slurry, forming a continuous lapped cement-added solid.

Traditional steel support technology

Traditional steel supports refer to the use of steel pipes, H-beams, angle steels, etc. to enhance the stability of engineering structures. Generally, they are inclined connecting members, and the most common ones are herringbone and cross shapes. Steel supports are widely used in subway and foundation pit enclosures. Because the steel support can be recycled and reused, it has the characteristics of economy and environmental protection.

Traditional concrete support technology

The support in the foundation pit refers to the support, reinforcement and protection measures adopted for the side wall of the foundation pit and the surrounding environment in order to ensure the safety of the construction of the underground structure and the surrounding environment of the foundation pit. Reinforced concrete inner support is a common form of support in foundation pit. By pouring reinforced concrete beams, the slab structure and the surrounding vertical enclosure structure of the foundation pit form a whole, and the cross nodes of the supporting beams are placed with load-bearing columns.

QiangJin core competitiveness

Master core technology

A number ofinnovative technology, such as prestressed fish-belly foundation pit steel structure technology, intelligent piling technology, compared with the traditional technology cost is low, short duration, good quality.
Technology research and development capabilities

Has authorized 61 invention patents and 73 utility model patents; chiefly participated in the compilation of a number of national and local norms and regulations.
equipment development capability

The experienced R&D team has improved and developed special equipment. There are more than 100 construction equipment, with reliable technology and efficient construction.
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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Tel:400-100-2850

Address:No. 289, Huixian Road, Jiading District, Shanghai

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