Post-grouting bored pile construction method

A technology of bored piles and construction methods, applied in sheet pile walls, foundation structure engineering, construction, etc., can solve the problems that concrete prefabricated piles are difficult to pass through hard silty clay layers, and achieve large bearing capacity and ensure mud Effects on mass, avoidance of collapse and diameter reduction

Inactive Publication Date: 2019-12-27
POWER CHINA HENAN ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is: to overcome the deficiencies of the prior art, provide a post-grouting bored pile construct

Method used

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Examples

Experimental program
Comparison scheme
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Example Embodiment

[0050] The steps of the post-grouting bored pile construction method of the present invention are as follows:

[0051] A post-grouting bored pile construction method is characterized in that it comprises the following steps:

[0052] Construction preparation:

[0053] 1) According to the physical characteristics of the construction ground, select appropriate drilling rigs, drill bits, arm guard casings and other mechanical equipment;

[0054] 2) The concrete adopts dense sand and gravel, the cement used for post-grouting is PC32.5 ordinary Portland cement, and the water-cement ratio is 1:2;

[0055] 3) The selection of steel bars and welding rods, the steel bars use φ-HPB300, φ-HRB335, and φ-HRB400 grades; among them: HPB300 steel bars use E43 type welding rods, HRB335, HRB400 steel bars use E50 type welding rods;

[0056] Specific construction steps:

[0057] A. Hole

[0058] 1) Positioning and stakeout: use the wire method to measure and place the axis of the pile position with a total s...

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PUM

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Abstract

The invention discloses a post-grouting bored pile construction method. The post-grouting bored pile construction method comprises the following steps of hole forming: measuring a pile position first,and then vertically burying a pile aligning the center of a steel protective cylinder with the center of a pile hole, and finally, drilling to form a hole; after the hole is drilled to a designed depth, using a hole cleaning drill bit to clean the hole once; transporting a made steel reinforcement cage to the site through a cage transporting vehicle; lowering the steel reinforcement cage in place; after a guide pipe is lowered, carrying out secondary hole cleaning; pouring concrete to the pile depth within half an hour of secondary hole cleaning; when the pouring is performed to the top of the pile, measuring the elevation of the top of the pile by using a heavy hammer or a measuring rod in real time; and finally, carrying out post-grouting construction, wherein in post-grouting construction, grouting is carried out on the pile side first; and after a grouting liquid is initially set, the grouting liquid is grouted to the bottom of the pile. By using the post-grouting bored pile construction method to construct, harmful effects on adjacent buildings and surrounding environments are small, the length and diameter of the pile can be freely changed according to design requirements, the end of the pile can enter a supporting layer or can be embedded into a rock stratum; and the bearing capacity of a single pile is large.

Description

[0001] 1. Technical field [0002] The invention relates to a pile foundation construction method, in particular to a post-grouting bored pile construction method, and belongs to the technical field of building construction. [0003] 2. Background technology: [0004] In pile foundation construction, grouting after pouring piles is often used to improve the bearing and pullout resistance of piles. For the main buildings (structures) of power plants, natural foundations cannot meet the strength and deformation requirements, and artificial foundations must be used; In general, the buried depth of the main building foundation of a power plant is between -5.00m and -7.50m, and the main bearing layers of the foundation are layer ① and layer ②, and some are layer ② or layer ③. The silty clay contains a large number of calcareous concretions, and it is difficult for the prefabricated concrete pile to penetrate the hard silty clay layer. [0005] 3. Contents of the invention: [0006...

Claims

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Application Information

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IPC IPC(8): E02D5/34E02D5/38E02D15/02
CPCE02D5/34E02D5/38E02D15/02
Inventor 郭俊义杜锦强李达疆汪洋连丽
Owner POWER CHINA HENAN ENG CO LTD
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