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Cast-in place pile post-grouting construction method for pouring construction

A technology of bored piles and construction methods, which is applied in construction, sheet pile walls, foundation structure engineering, etc., can solve the problems that the sediment at the bottom of the pile and the mud skin on the pile side cannot be effectively reinforced, and the vertical load drops greatly, and achieves The effect of shortening the number of pile foundations, shortening pile length, and reducing pile diameter

Inactive Publication Date: 2015-05-13
CHINA RAILWAY CONSTR BRIDGE ENG BUREAU GRP OF THE FIFTH ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] With the increasing development of high-rise buildings in my country, the requirements for the bearing capacity of pile foundations are getting higher and higher, and the design parameters of pile diameter and pile length are more and more demanding. In areas where the underground soil is mainly muddy clay, drilling Cast-in-situ pile foundations are frequently used, but the biggest disadvantage of bored-in-place piles formed by the existing common bored-hole grouting method is that the sediment at the bottom of the pile and the mud skin on the pile side cannot be effectively reinforced, and the vertical load drops greatly. defect

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  • Cast-in place pile post-grouting construction method for pouring construction

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Embodiment 1

[0040] The present invention proposes a grouting construction method after the bored pile for pouring construction, such as figure 1 shown, including the following steps:

[0041] 1) Hole-forming construction of bored piles: According to the construction process requirements, the bored piles are drilled to form pile holes. During the construction process, the hole depth, diameter and verticality are controlled to understand the condition of the hole wall and the hole wall in time. Internal conditions, whether there are collapsed holes and water leakage, so as to carry out effective technical control during post-grouting construction;

[0042] 2) Cleaning the hole for the first time: After step 1), clean the inside of the pile hole and clean up the residue left during drilling;

[0043] 3) Install reinforcement cages and grouting pipes: hang the assembled reinforcement cages with grouting pipes into the pile holes; strictly control the connection between the grouting pipes and...

Embodiment 2

[0054] This embodiment is further optimized on the basis of the above embodiments. Further, in order to better realize the present invention, the step 3) includes the following steps:

[0055] 3.1) Manufacture and installation of grouting pipe: the grouting pipe is made of steel pipe with a diameter of 25mm~32mm, and the wall thickness of the grouting pipe is greater than or equal to 2.5mm. The grouting pipe is composed of three parts: the pile end grouting device, the middle straight pipe, and the top Joints with threaded buckles, the pile end grouting device is made within 30cm of the bottom of the grouting pipe, and the side wall of the pile end grouting device is provided with grout holes in the shape of a plum blossom. Wrap the completed pile end grouting device with adhesive tape, wrap the outside with lead wire tightly to prevent leakage, and also prevent the concrete grout from blocking the grouting hole of the pile end grouting device of the grouting pipe, affecting th...

Embodiment 3

[0058] This embodiment is further optimized on the basis of the above embodiments. Further, in order to better realize the present invention, in the step 6), when performing pile concrete maintenance, it also includes pressurized water unplugging process, pile pouring Use high-pressure water pressure to pass the grouting pipe within 2~3 days after the completion of the concrete. The water pressure is 2MPa, and the water pressure time is 3~5min. When the pressure exceeds 4MPa, it can be considered that the pipeline is blocked; , indicating that the pipeline has been opened, stop water injection immediately, so as to prevent a large amount of water from pouring into the ground; sooner or later, the uncorking time is particularly critical to the grouting effect. Destroying the concrete strength at the pile end, unplugging the plug too late, and the strength of the concrete wrapping the grouting pipe is too high will cause the adhesive tape of the grouting head to be unopened, the ...

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Abstract

The invention discloses a cast-in place pile post-grouting construction method for pouring construction. The method comprises the steps that cast-in place pile pore-forming construction is carried out; first-time hole clearing is carried out; reinforcement cage and grouting pipe mounting is carried out; second-time hole clearing is carried out; pile body concrete placing is carried out; pile concrete curing is carried out; grouting soil mass reinforcement is carried out; grouting is stopped; next cast-in place pile grouting working is carried out; and checking and accepting are carried out. After pile forming, the intensity of pile body concrete reaches a certain degree, a high-pressure generating device is used, high-pressure cement grout flow with concentrated energy is formed, grout is combined with pile body surrounding soil mass through the effects of permeating, separation, filling, compaction and the like, pile body sediment and pile side mud cakes are solidified, pile side friction resistance and pile end bearing force are enlarged, the shortcomings that due to hole bottom sediment and pile side mud cakes of a common cast-in place pile, bearing force is low, and vertical load decreasing is high are overcome, and important economic and social significance is achieved in single pile bearing force improving, pile foundation sedimentation lowering, pile foundation engineering quality guaranteeing and the like.

Description

technical field [0001] The invention relates to the technical field of pouring construction, in particular to a post-grouting construction method for bored piles used for pouring construction. Background technique [0002] The development of grouting technology has a history of 100 years. Its principle mechanism is to inject some grout that can be well consolidated with rock and soil into the pores and cracks of rock and soil by hydraulic, pneumatic, or electrochemical methods. To make the rock and soil become a new structure with high strength, good impermeability and high stability, so as to achieve the purpose of improving the physical and mechanical properties of the rock and soil. [0003] The research and application of grouting technology in my country is relatively late, and it only started in the early 1950s. However, after more than 50 years of development, my country has made great progress in grouting technology, especially in the development of cement grouting m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D5/34E02D15/04
CPCE02D5/34E02D15/04
Inventor 张庆李海云何十美
Owner CHINA RAILWAY CONSTR BRIDGE ENG BUREAU GRP OF THE FIFTH ENG
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