Comprehensive foundation pit support construction method for sandstone combined soil layer

A construction method and sand layer technology, which are applied in basic structure engineering, excavation, construction, etc., can solve the problems of long construction period and complex foundation pit support construction, and achieve the goal of reducing support costs, construction time, and difficulty. Effect

Active Publication Date: 2015-12-02
河北二十冶建设有限公司
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Problems solved by technology

[0004] The purpose of the present invention is to provide a comprehensive foundation pit support construction method with sandstone combined with soil layer, to solve the problems in the prior art that the foundation pit support construction is relatively complicated and the construction period is long in the environment of sandstone combined with soil layer

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  • Comprehensive foundation pit support construction method for sandstone combined soil layer
  • Comprehensive foundation pit support construction method for sandstone combined soil layer

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Embodiment Construction

[0020] Such as figure 1 and figure 2 Shown, the concrete steps of foundation pit comprehensive support construction method of the present invention are:

[0021] (1) Carry out earthwork excavation on the upper clay layer 1, and stop the earthwork excavation work until the sand layer 2 appears, and alternately install a number of obliquely inserted well point downwater pipes 4 and Several vertical well point downpipes 5.

[0022] (2) Simultaneously operate the obliquely inserted well point downpipe 4 and the vertical well point downpipe 5: use the obliquely inserted well point downpipe 4 to intercept the groundwater at the interface between the sand layer 2 and the rock layer 3, and use the vertical well point to dewater The pipe 5 intercepts groundwater in the sand layer 2 .

[0023] (3) After the water level of the groundwater in the sand layer 2 drops to the predetermined elevation, the foundation pit will be excavated in the next step. After excavation until the rock la...

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Abstract

The invention provides a comprehensive foundation pit support construction method for a sandstone combined soil layer. The method comprises specific steps as follows: a, a clay layer on the upper layer is subjected to earth excavation, and a plurality of oblique inserting type well point dewatering pipes and a plurality of vertical type well point dewatering pipes are alternately mounted on a sand layer after excavation is performed to the sand layer; b, the oblique inserting type well point dewatering pipes and the vertical type well point dewatering pipes are operated simultaneously; c, excavation is continuously performed after water level of underground water in the sand layer is decreased to a reserved elevation, and dense steel screens are paved at the lower part of the sand layer and soil nails are adopted for anchoring after the excavation is performed to a rock layer; d, rocks of the rock layer are chiseled, and earth excavation is performed continuously; e, broken stones after chiseling are removed, and structural construction is performed. According to the method, a support mode of combination of light dewatering wells and dense steel screen anchoring is adopted, underground water in the sand layer can be drained in time, the safety of the foundation pit support process is improved, and the difficulty of foundation pit excavation is reduced. The support technology is simpler, the support cost is reduced, and the construction time is shortened.

Description

technical field [0001] The invention relates to a construction method for foundation pit support, in particular to a construction method for foundation pit comprehensive support with sandstone combined with soil layers. Background technique [0002] According to the actual project construction needs and the increasing shortage of construction land, the selected area for project construction land is gradually close to the areas along the river, coastal areas and tidal flats, and these areas are mostly sandstone-combined strata. Therefore, when excavating the foundation pit, it needs to pass through the clay layer, sand layer and rock layer in sequence from top to bottom. Since the middle sand layer has a high water content and sufficient water source, a large area of ​​quicksand will appear when the base excavation passes through the sand layer. , resulting in the inability to excavate the foundation pit smoothly. In the case of precipitation construction, because the rock l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D17/04
Inventor 张宝建
Owner 河北二十冶建设有限公司
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