Construction method of piled anchor and liquid nitrogen frozen earth wall combined support system

A composite support and construction method technology, applied in sheet pile wall, excavation, infrastructure engineering and other directions, can solve the problems of complicated construction, long formation time of frozen soil wall, low construction efficiency of support system, etc., and achieve support performance. Reliable, high bearing capacity and practical effect

Inactive Publication Date: 2018-11-13
王海霖
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a construction method for a composite support system of pile anchors and liquid nitrog

Method used

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  • Construction method of piled anchor and liquid nitrogen frozen earth wall combined support system
  • Construction method of piled anchor and liquid nitrogen frozen earth wall combined support system
  • Construction method of piled anchor and liquid nitrogen frozen earth wall combined support system

Examples

Experimental program
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Effect test

Embodiment 1

[0039] The construction method is as follows:

[0040] Step 1. Evenly arrange the slope protection piles 1 along the edge of the foundation pit 5. In this embodiment, the slope protection piles 1 are long spiral drilled cast-in-place piles. The specific process is as follows:

[0041] (1) Hole forming: use a long auger drilling rig for drilling construction, first straighten the drilling rig, and then stop after drilling to the design elevation with the drill pipe.

[0042] (2) Pumped concrete: pump concrete with a slump of 220±20mm while lifting the drill until it reaches the orifice. When the pouring of concrete starts, the driver of the drilling rig blows his whistle to give a signal. The person in charge of the pump truck starts to pump the concrete and responds by whistle to the driver of the drilling rig. The driver of the drilling rig starts to lift the drill after receiving a clear response. If there is not much concrete stored in the ground pump during the pouring pr...

Embodiment 2

[0071] The difference between this embodiment and Embodiment 1 is that in step (2) of step 3, the liquid nitrogen supply pipeline adopts pipelines of different materials. The freezing tube 4 is made of Ф108×8mm low-temperature resistant plastic pipe, the temperature measuring tube is made of Ф89×5mm low-temperature resistant plastic pipe, the liquid supply pipe and the system connecting pipe are made of Ф32×3.0mm R304 low-temperature resistant plastic pipe, and the plastic material can be PVC, PPR, ABS , PE and other plastic materials. In this embodiment, there is no need to pull out the freezing tube 4 in step (4) of step 3. The steps of pulling out the frozen pipe 4 are reduced, the construction steps are reduced, and the efficiency is improved.

Embodiment 3

[0073] The difference between this embodiment and Embodiment 1 is that the shape of the liquid nitrogen frozen soil wall 2 is not an upright plane wall but a curved frozen soil wall, and the freezing pipe 4 in step 1 is arranged along a curve. The span of the curved frozen soil wall is small, and the rigidity of the end of the frozen soil wall and the overall stability of the frozen soil wall must be guaranteed. The frozen column pile 7 needs to bear the thrust transmitted by the curved frozen soil wall and the pressure of the soil within the pile range. The tension side of the liquid nitrogen frozen soil wall 2 is also provided with steel bars, glass fiber bars or bamboo bars as tensile materials. Can adapt to the foundation pit 5 needs of more shapes like this.

[0074] Before the construction of the composite support system, the drainage system can be set first to avoid the impact of groundwater on the construction of the support system, and drainage structures such as surf...

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Abstract

The invention discloses a construction method of a piled anchor and liquid nitrogen frozen earth wall combined support system. The construction method comprises the following steps of 1, uniformly arranging slope protection piles along the edge of a foundation pit, wherein the slope protection piles are long auger drilling cast-in-situ bored piles; 2, driving anchor rods into the stratum in an inclined manner, and anchoring the anchor rods through lock beams after the anchor rods penetrate the slope protection piles and are stretched; and 3, arranging a frozen earth wall in foundation soil, and anchoring the frozen earth wall and the anchor rods together by means of the freezing effect of the liquid nitrogen frozen earth wall. The construction method has the advantages that the construction method is good in waterproofness and can adapt to various complex environments and geological conditions; steel and concrete are saved, and safety and environmental friendliness are achieved; and the freezing speed is high, and freezing strength is high.

Description

technical field [0001] The invention relates to the field of building construction, in particular to a construction method for a composite support system of pile anchors and liquid nitrogen frozen soil walls. Background technique [0002] At present, the pile-anchor support system belongs to the pull-anchor structure, which is suitable for deep foundation pit support of various soils such as sandy soil and cohesive soil, and is widely used in urban underground engineering. The pile-anchor support system is mainly composed of a pile maintenance system, a bolt anchorage system and a water retaining system. In the design process of the foundation pit pile anchor support scheme, the depth and stiffness of the pile, support interval, anchor rod form, etc. must be reasonably selected in order to achieve the best match in terms of economy, safety and construction technology. The support of deep foundation pits is difficult, the construction period is long, and there are many unsta...

Claims

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Application Information

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IPC IPC(8): E02D17/04E02D19/14E02D19/18E02D5/18
CPCE02D5/18E02D17/04E02D19/14E02D19/18E02D2250/0023
Inventor 王海霖
Owner 王海霖
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