Composite soil nailing wall and pile-anchor support compound support structure and construction method

A technology of composite soil nailing and composite support, which is applied in basic structure engineering, excavation, construction, etc., and can solve problems such as poor mechanical properties of backfill soil layers, small grading space, and influence of composite soil nailing on wall support, etc.

Active Publication Date: 2018-07-31
北京爱地地质工程技术有限公司
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the process of foundation pit construction, there are often complex working conditions in which the thickness of the artificial filling soil layer in the foundation pit is relatively large and the grading space is small. Due to the poor mechanical properties of the backfill soil layer, when the prestressed anchor is stretched, The pressure of the rod end of the prestressed anchor rod on the composite soil nail wall to the soil will destroy the grading boss, which will not only affect the support of the composite soil nail wall, but may also cause the force failure of the prestressed anchor rod

Method used

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  • Composite soil nailing wall and pile-anchor support compound support structure and construction method
  • Composite soil nailing wall and pile-anchor support compound support structure and construction method
  • Composite soil nailing wall and pile-anchor support compound support structure and construction method

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Embodiment 1

[0030] A composite support structure of composite soil nail wall and pile-anchor support suitable for backfilling, such as figure 1 As shown, it is applied to the side wall of the foundation pit with a deep backfill soil layer 11 under the ground 1, including steel pipe piles 3, slope protection piles 2, soil nail surface walls 41, and prestressed anchor rods 7.

[0031] like image 3 As shown, the slope protection pile 2 is a reinforced concrete pile. In order to increase the retaining capacity of the support system without excessively increasing the cost of the support system, two steel pipe piles 3 are inserted between adjacent slope protection piles 2, and the slope protection pile 2 Together with the steel pipe pile 3, a soil retaining structure is formed. The cost of the steel pipe pile 3 is lower than that of the slope protection pile 2 made of reinforced concrete piles, and its soil retaining capacity can basically meet the soil retaining requirements between adjacent...

Embodiment 2

[0039] A construction method for composite support suitable for deep backfilled soil foundation pits, the steps of which are as follows:

[0040] S1: Excavate the earthwork to the elevation of the construction work surface. According to the depth and distance of the foundation pit designed in the initial stage, drill holes vertically downward from the ground 1 to form several pile holes. Bind the reinforcement cage according to the diameter of the pile holes and lower them into the pile holes. and cast to form reinforced concrete piles;

[0041] S2: Insert one or more steel pipe piles 3 between adjacent reinforced concrete piles depending on the soil layer, and inject cement slurry into the steel pipe piles 3;

[0042] S3: Make a crown beam 5 on the top of all the reinforced concrete piles to connect the tops of all the slope protection piles 2 as a whole, and pass through 3 steel pipe piles, which can be connected by planting reinforcement;

[0043] S4: Insert soil nails 6 a...

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Abstract

The invention discloses a composite soil nailing wall and pile-anchor support compound support structure and a construction method. A composite soil nailing wall and a pile-anchor support are used ina combined manner; the composite soil nailing wall fully utilizes the available space in a foundation pit to perform moderate grading, therefore the density of slope protection piles in the pile-anchor support is lowered, and the construction cost is lowered; and meanwhile, a proper number of steel pipes are inserted among the slope protection piles to assist the slope protection piles, and foundation pit supporting is performed according to an advanced supporting concept. Meanwhile, for deep backfill which is loose and soft in soil texture, to achieve the effect that the pile-anchor support and the composite soil nailing wall can both give play to the actual supporting effect, one ends of pre-stressed anchor rods close to the upper portion of the foundation pit are locked into a top beam,and the other ends are inserted into a pebble bed under the backfill stratum in a large-angle inclined inserting manner to form a reliable tension effect. The steel pipes are additionally arranged between the ends of the pre-stressed anchor rods of the grading segment and the slope protection piles, so that the tension force of the pre-stressed anchor rods is transferred to the slope protection piles without damaging a grading boss.

Description

technical field [0001] The invention relates to the field of foundation pit support, in particular to a composite support structure and construction method of a composite soil nail wall and pile anchor support. Background technique [0002] The foundation pit project is a temporary support and soil reinforcement project to protect the smooth progress of the open-cut construction in the underground space and the surrounding environment from damage. Two common support forms in the field of foundation pit support are pile anchor support and composite soil nail wall support. When the foundation pit is supported, when the space meets the slope conditions, it is preferable to slope the side wall of the foundation pit, and use a small slope coefficient to cooperate with the composite soil nail wall for support. However, grading itself needs to occupy the space of the foundation pit and its surroundings. For the occasions where the construction space is limited, it is necessary to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D17/04
CPCE02D17/04Y02A10/23
Inventor 张娇孙剑李强李芳屈正杨波于元峰
Owner 北京爱地地质工程技术有限公司
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