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Multi-row pile foundation pit support structure and its construction method

A technology for foundation pit support and support structure, which is applied in basic structure engineering, excavation, construction, etc., can solve problems such as unsatisfactory, occupying underground space, etc., and achieves the effect of saving construction period, convenient excavation, and no maintenance.

Active Publication Date: 2015-09-23
JIANGSU HONGJI ENERGY SAVING NEW TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The double row of piles is to use the pile top ring beam to connect the two rows of piles into a whole to form a portal structure; the composite support structure of piles and anchors means: there are piles vertically, and anchors are used between the piles Rods and anchors usually have two parts: free end and fixed end. The length is required to be longer, and drilling and grouting processes must be required. Because the process is complicated and it needs to occupy other people’s underground space, it is difficult to use; the reinforcement invented by me Confined soil composite support structure and construction method patents have greatly improved the stress state and application range of the unsupported foundation pit support structure, but it is still not ideal for weaker soil layers

Method used

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  • Multi-row pile foundation pit support structure and its construction method
  • Multi-row pile foundation pit support structure and its construction method
  • Multi-row pile foundation pit support structure and its construction method

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Embodiment 1 Multi-row pile stepped foundation pit support structure

[0030] Multi-row pile stepped foundation pit support structure (such as figure 1 Shown) The specific implementation method is:

[0031] 1) Construct outer row water stop pile 11, soil retaining pile 12, middle row soil retaining pile 3, and inner row soil retaining pile 2, and repeat the above production until all water stop piles and soil retaining piles are formed;

[0032] 2) Reinforcing soil 6 between construction piles;

[0033] 3) Excavate the earthwork to the top of the outer soil retaining and water-stop pile 1, and construct the pile top ring beam 4;

[0034] 4) Excavate the earthwork to the pile top elevation of the middle row of soil retaining piles 3, and use reinforced concrete construction to connect the beam plate 5 at the pile top of the middle row of soil retaining piles 3 and the corresponding waist of the outer row of soil retaining piles 1;

[0035] 5) Continue to excavate the ...

Embodiment 2

[0037] Embodiment 2 Multi-row pile stepped foundation pit support structure with reinforcement

[0038] In order to further improve the support depth of the foundation pit and expand the application of this method in the weak soil layer, reinforcement 7 can be added on the basis of the above-mentioned embodiment 1 to form a multi-row pile stepped foundation pit support structure with reinforcement ( Such as figure 2 shown), its concrete construction method is basically the same as the construction method of embodiment 1, and the difference is that two procedures are inserted between example 1 procedure 3) and 4), i.e.

[0039] Insertion 1) Continue to excavate the earth to the predetermined elevation of the reinforcement 7 on the first layer, and implant the reinforcement 7 horizontally into the soil behind the outer row of soil retaining and water-stop piles 1 according to the design interval; One end of the outer row soil retaining water stop pile 1 is connected;

[0040]...

Embodiment 3

[0042] Embodiment 3 Double-row pile frame type foundation pit support structure

[0043] When there are only two rows of support piles left, and the pile top elevations of the two rows of piles are the same, a double-row pile frame type foundation pit support structure can be formed (such as image 3 shown), the specific construction method is as follows:

[0044] 1) Construction of outer row water stop pile 11, soil retaining pile 12, and inner row soil retaining pile 2. The water-stop pile 11 can be a stirring pile and a rotary grouting pile, and the soil-retaining pile can be a bored pile, a prestressed pipe pile, and an H-shaped steel. Repeat the above manufacturing until all the water-stop piles and soil-retaining piles are formed;

[0045] 2) Reinforcing soil 6 between construction piles;

[0046] 3) Excavate the earthwork to the top of the outer row of soil retaining piles 1 and the inner row of soil retaining piles 2, and add temporary support on the top of the two r...

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Abstract

The invention relates to a multi-row pile foundation pit support; a plurality of outer-row soil-retaining and water-stopping piles (1), a plurality of middle-row soil-retaining piles (3) and a plurality of inner-row soil-retaining piles (2) of the support structure are lined vertically; pile top ring beams (4) are arranged on the tops of the outer-row soil-retaining and water-stopping piles (1); all outer-row piles are connected into a whole; first connecting beam slabs (51) are arranged on the tops of the middle-row soil-retaining piles (3) and the waists of the corresponding outer-row soil-retaining and water-stopping piles (1) to connect all the middle-row soil-retaining piles (3) with the corresponding outer-row soil-retaining and water-stopping piles (1) into a whole; second connecting beam slabs (52) are arranged on the tops of the inner-row soil-retaining piles (2) and the waists of the corresponding middle-row soil-retaining piles (3) to connect all the inner-row soil-retaining piles (2) with the corresponding middle-row soil-retaining piles (3) into a whole; and inter-pile reinforcing soil (6) is filled between two rows of piles. The multi-row pile foundation pit support structure which is constructed through the method can effectively maintain the stability of a foundation pit and a side slope, and the support in the pit is eliminated.

Description

technical field [0001] The invention relates to foundation pit support engineering in civil construction engineering, in particular to a multi-row pile foundation pit support structure and a construction method thereof. Background technique [0002] At present, in the foundation pit support structure, there are two kinds of foundation pit support structure without support and support structure of foundation pit. Due to the existence of supports in the supporting structure of the foundation pit, the earthwork needs to be transported repeatedly, which affects the excavation of the earthwork; the construction, maintenance and removal of the supports take time, which affects the construction progress. Commonly used unsupported foundation pit support schemes include: double-row pile foundation pit support structure, pile and anchor composite support structure, etc. The double row of piles is to use the pile top ring beam to connect the two rows of piles into a whole to form a po...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D17/04
Inventor 卫海夏秀华陈宝勤
Owner JIANGSU HONGJI ENERGY SAVING NEW TECH CO LTD
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