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Construction method of high-pressure jet grouting pile used outside underground diaphragm wall joint for reinforcing seal waterstop

A technology of high-pressure rotary grouting piles and construction methods, which is applied to sheet pile walls, foundation structure engineering, construction, etc., can solve problems such as poor reinforcement and water-stopping effects, low foundation pit safety hazards, etc., to achieve convenient construction, reduce safety hazards, Satisfy the effect of economic benefit

Active Publication Date: 2016-10-05
MCC5 GROUP CORP SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a rigid structure, the underground diaphragm wall itself has good reinforcement, water-stop and anti-seepage effects, but the joints between the wall panels are often the weak link in the structural construction, which often leads to poor reinforcement and water-stop effects, especially affected by the surrounding environment. There are still serious safety hazards in the construction of low foundation pits for projects with greater impact
[0003] Therefore, there are above-mentioned inconveniences and problems in the known underground diaphragm wall interface external reinforcement seal water-stop mode

Method used

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  • Construction method of high-pressure jet grouting pile used outside underground diaphragm wall joint for reinforcing seal waterstop
  • Construction method of high-pressure jet grouting pile used outside underground diaphragm wall joint for reinforcing seal waterstop
  • Construction method of high-pressure jet grouting pile used outside underground diaphragm wall joint for reinforcing seal waterstop

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Effect test

Embodiment 1

[0043] The Fuzhou Rail Transit Command Center Project is located in the northeast corner of the intersection of Guangda Road and Da Road, Taijiang District, Fuzhou City. The safety level of the foundation pit support project is the first level, the importance coefficient is 1.1, and the protection level of the foundation pit is the first level. The service life of foundation pit support is one year. The foundation pit is constructed by the open cut method, the excavation depth is about 15m (the deepest is about 18.2m), the foundation pit is about 146m long, and the width is about 48.4-50.2m. There are 76 pieces of ground walls in this project, and the sections are numbered from Q1 to Q73 (Q11, Q21, and Q23 are 2 pieces respectively), of which 64 pieces are in the shape of "一", 6 pieces in the shape of "L", and 4 pieces in the shape of "∧". 1 piece, 2 pieces of "Z" type. There are 77 ground-to-wall interfaces. The engineering foundation pit enclosure adopts 800mm thick separa...

Embodiment 2

[0066] image 3 It is the general flow chart of jet grouting pile construction of the embodiment of the present invention, and its basic technical measures are the same as embodiment 1.

Embodiment 3

[0068] Figure 4 It is the construction flowchart of the double pipe high-pressure rotary grouting pile of the embodiment of the present invention, and its basic technical measures are the same as that of embodiment 1.

[0069] Single-pipe method construction, cement and water are weighed for stirring and mixing, and input to the high-pressure pump.

[0070] Double-pipe construction, spraying cement slurry and compressed air at the same time.

[0071] The injection tubes in the single-tube method and the double-tube method are thinner (within 5cm in diameter). The diameter of the three-pipe injection pipe is usually 7~9cm, and the structure is complex, so sometimes it is necessary to pre-drill a hole with a diameter of 15cm, and then put the three-pipe injection for construction. Cement silos, water tanks and weighing systems were specially set up during the construction. In the process of conveying cement slurry, high-pressure water and compressed air, monitoring devices a...

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Abstract

The invention relates to a construction method of a high-pressure jet grouting pile used outside an underground diaphragm wall joint for reinforcing a seal waterstop. The mature high-pressure jet grouting pile construction method is adopted, and the seal waterstop is strengthened and reinforced in the underground diaphragm wall joint weak link in a form of constructing the high-pressure jet grouting pile outside the underground diaphragm wall joint. The method is characterized by including the following technical steps of a, determination of construction parameters and selection of construction methods, b, jet material control, c, measurement and locating, d, pile test, e, technical control on jet process construction, f, grout return observation, g, recharge, h, observation of surroundings in the jet process, and i, abandoned slurry sewage discharge. The method has the advantages of the mature construction process of the high-pressure jet grouting pile, simpleness, convenience in construction, safety and reliability in construction quality, obvious effect on waterstop reinforcement of the underground diaphragm wall joint, capabilities of greatly lowering potential risk in foundation pit construction and meeting economic benefit of engineering construction.

Description

technical field [0001] The invention relates to a construction method of a high-pressure rotary grouting pile, in particular to a construction method of a high-pressure rotary grouting pile used for strengthening, sealing, and water-stopping outside the interface of an underground diaphragm wall. Background technique [0002] There are various forms of structural support for deep foundation pits in China. In recent years, with the development of production and the expansion of urban construction scale, there have been more and more deep foundation projects, and the construction conditions have become more and more restricted. Underground foundation pits are getting deeper and deeper, and the use of underground diaphragm walls as deep foundation pit support structures is becoming more and more mature. As a rigid structure, the underground diaphragm wall itself has good reinforcement, water-stop and anti-seepage effects, but the joints between the wall panels are often the we...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D5/46
Inventor 范振雷
Owner MCC5 GROUP CORP SHANGHAI
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