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Construction method for lock catch steel pipe pile cofferdam without bottom sealing concrete in high-water-level complex stratum

A technology for back-sealing concrete and complex strata, which is applied in water conservancy projects, separation methods, chemical instruments and methods, etc., can solve the problems of long construction period, high construction cost, complex construction process, etc., to reduce construction difficulty, improve construction efficiency, The effect of shortening the construction period

Inactive Publication Date: 2021-03-23
CHINA CONSTR THIRD ENG BUREAU GRP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to solve the problems of complex construction process, long construction period and high construction cost in the above-mentioned construction method of locking steel pipe pile cofferdam underwater bottom sealing concrete, and to provide a kind of high water level complex stratum without Bottom-sealed concrete locking steel pipe pile cofferdam construction method to reduce construction difficulty, shorten construction period and save construction cost

Method used

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  • Construction method for lock catch steel pipe pile cofferdam without bottom sealing concrete in high-water-level complex stratum
  • Construction method for lock catch steel pipe pile cofferdam without bottom sealing concrete in high-water-level complex stratum
  • Construction method for lock catch steel pipe pile cofferdam without bottom sealing concrete in high-water-level complex stratum

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Embodiment Construction

[0030] Attached below Figure 1-3 and Examples further illustrate this specification.

[0031] According to the present invention, the construction method of the cofferdam of the unsealed concrete locking steel pipe piles in the high water level complex stratum includes the following steps.

[0032] Step 1. Refer to figure 1 , use the guide frame 3 to insert and lock the steel pipe pile 1.

[0033] Step 2. Refer to figure 1 , use a rotary drilling rig to drill downward from the steel pipe pile 1, and install dewatering wells 2 in the steel pipe pile 1, and the number and depth of the dewatering wells 2 are determined according to calculation. In this embodiment, the stratum is complex. From below the riverbed surface 31, the stratum is successively a fine sand layer 32, a pebble layer 33, a silty clay layer 34, a fine sand layer 35, a hard clay layer 36, a medium sand layer 37, and a silty clay layer. 38. Considering that the hard clay layer 36 has weak water permeability,...

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Abstract

The invention discloses a construction method for a lock catch steel pipe pile cofferdam without bottom sealing concrete in high-water-level complex stratum. The construction method comprises the steps that a lock catch steel pipe pile is inserted and driven by using a guide frame; rotary drilling is carried out downwards from the interior of the steel pipe pile by adopting a rotary drilling rig,and a dewatering well is arranged in the steel pipe pile; a submersible pump is arranged in the dewatering well; the water level in the cofferdam is lowered to be below the bottom of a foundation pit,foundation pit supporting and excavating are carried out, and foundation cleaning is carried out to the bottom of a bearing platform; and a concrete cushion at the bottom of the bearing platform is poured, and bearing platform construction is completed in a water-free environment.

Description

technical field [0001] The invention belongs to the technical field of bridge foundation construction, and in particular relates to a construction method of a deep-water cap under the condition that there is no bottom seal in a complex stratum with high water level. Background technique [0002] Commonly used construction methods for deep water caps include steel casing cofferdam, steel sheet pile cofferdam and steel pipe pile cofferdam. Locking steel pipe pile cofferdam has high rigidity, strong adaptability, good penetration and penetration characteristics, and can be adapted to various complex strata. [0003] For high water level geological conditions, the locking steel pipe pile cofferdam generally needs to be equipped with bottom-sealing concrete to resist the water and soil pressure at the bottom of the pit and prevent the foundation pit from bursting. The specific method of concrete construction for the bottom cover is: the constant water level around the cofferdam ...

Claims

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Application Information

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IPC IPC(8): E02D19/04E02D5/28E02D17/04E02D19/10E02D29/16E02D31/02B01D36/04
CPCB01D36/04E02D5/285E02D17/04E02D19/04E02D19/10E02D29/16E02D31/02
Inventor 甄玉杰李华龙黎建宁代子洲罗国龙卢慧忠刘刚张志伟李钰莹徐盟
Owner CHINA CONSTR THIRD ENG BUREAU GRP CO LTD
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