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Construction process of poured pile with steel pipe as wall protecting casing

A technology of bored piles and wall casings, applied in sheet pile walls, infrastructure engineering, construction, etc., can solve problems such as vibration, soil collapse, and inability to ensure subway safety, and achieve low noise, low vibration, Good social and environmental benefits

Inactive Publication Date: 2007-10-03
SHANGHAI NO 4 CONSTR
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AI Technical Summary

Problems solved by technology

[0006] The present invention aims to solve the technical problems of existing construction methods such as piling next to the subway, especially within the depth range of the subway tunnel, which will cause vibration, soil collapse, and failure to ensure the safety of the subway operation, etc., and provides a close-fitting The ultra-deep cast-in-place pile construction method for the subway line, which has the characteristics of small vibration and low noise during construction, and the depth of the hole is much higher than the bottom elevation of the subway tunnel. The extrusion of the adjacent soil layer ensures the safety of the subway tunnel in operation

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  • Construction process of poured pile with steel pipe as wall protecting casing

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Embodiment Construction

[0038] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0039] The process principle of the present invention: use a full set of pipe pile machine to bite and press the steel pipe, and press the steel pipe into the soil while taking the soil. After the steel casing is connected with the special method of internal hexagonal burial, continue to bite and press the steel casing until it reaches the design elevation. , In the range of the buried depth of the full casing, because of the casing, there will be no hole collapse and hole expansion, and the soil will not move. In this way, the operation safety of the subway tunnel will not be affected, and the bored pile construction will be carried out after the full casing is pressed to the design elevation and the soil is taken.

[0040] Process flow and operating points of the present invention:

[0041] 1. Process flow: as shown in Figure 1

[0042] 2. Key point...

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Abstract

The construction process of poured pile with steel pipe as wall protecting casing includes the following steps: leveling field and determining pile site, emplacing casing pile machine, emplacing steel pipe, pressing in the first steel casing, checking the verticality, taking soil and butt jointing steel casing, pressing in other steel casings until reaching the designed depth, measuring the hole depth, shifting the casing pile machine and emplacing the pile pouring machine, drilling hole, measuring hole depth, diameter and inclination, cleaning the hole and measuring bottom settling thickness, depositing reinforcing cage, depositing casing, cleaning hole and pouring concrete. The present invention has high pile constructing quality.

Description

technical field [0001] The invention relates to a construction method of bored cast-in-situ piles using steel pipes as casing wall protection, in particular to a construction method of ultra-deep cast-in-situ piles used next to subway running lines. Background technique [0002] There are four piles in the gap between the reconstruction and expansion project of the Far East Entertainment Plaza and the New World Mall, which are close to the subway tunnel. The designed pile diameter is Φ800 and the pile length is 78.2 meters. The root pile is on the east side of the uplink (Tibet Road), and the designed pile position is only about 1.6 meters away from the subway tunnel. Most of the soil around the subway tunnel has been reinforced with rotary grouting piles or mixing piles. During the construction of the basement of the square, an enclosure structure was built, and there were unforeseen factors such as underground obstacles within 7 meters of the ground in ...

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Application Information

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IPC IPC(8): E02D5/38E02D7/20
Inventor 张铭邱锡宏梅竹倪建新周红兵曹文根
Owner SHANGHAI NO 4 CONSTR
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