Rotary drilling type sand-pumping hole-forming side wall high-pressure grouting device and construction method

A high-pressure grouting and hole-forming technology, used in excavation, infrastructure engineering, sheet pile walls, etc., can solve problems such as the inability to apply calcareous sand foundation, reduce friction between calcareous sand particles, and collapse of pile holes. , to achieve the effect of preventing collapse, saving materials and improving bearing capacity

Active Publication Date: 2021-07-27
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Different from traditional foundations, calcareous sand has the properties of looseness, large pores, and easy breakage. The traditional mud retaining method is used to inject sea cement slurry prepared with materials such as bentonite, seawater, tackifier, and dispersant into the pile holes of the calcareous sand foundation. In the study, it was found that the water in the mud would permeate and flow away when it entered the

Method used

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  • Rotary drilling type sand-pumping hole-forming side wall high-pressure grouting device and construction method
  • Rotary drilling type sand-pumping hole-forming side wall high-pressure grouting device and construction method
  • Rotary drilling type sand-pumping hole-forming side wall high-pressure grouting device and construction method

Examples

Experimental program
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Effect test

Embodiment 1

[0047] see Figure 1-4 , a rotary drilling-type sand pumping hole-forming side wall high-pressure grouting device, which includes an inner casing 1, the outside of the inner casing 1, and a length of casing on the upper part of which is wrapped with a flower tube 2, the inner casing 1 The outside of the casing 1, and the remaining length of the lower part is fixed with a steel casing 22. An annular cavity is formed between the inner casing 1 and the flower tube 2, and a slurry storage layer 11 is formed. The slurry storage layer 11 The opening at the top of the casing is blocked by a pressing sheet 21; the slurry storage layer 11 is connected to the grouting machine 7 for grouting; A chain bucket device 6 is arranged inside the inner casing 1 , and a plurality of evenly distributed buckets 5 for sand digging are arranged on the chain bucket device 6 . By adopting the high-pressure grouting device with the above-mentioned structure, the high-pressure grouting of the side wall ...

Embodiment 2

[0062] The method for constructing using any one of the rotary drilling type sand pumping hole-forming sidewall high-pressure grouting devices includes the following steps:

[0063] S1: Level the construction area and remove debris, make uniform arrangements for the mud pool, suction machine, grouting machine and construction access road in the construction area to facilitate construction, survey the average particle size of calcareous sand at different depths in the area, Add expansion agent, accelerator and additives to prepare modified slurry with suitable water-cement ratio;

[0064] S2: Determine the size and depth of the piling hole. According to the average particle size of the calcareous sand under the foundation measured before construction, select the pumping pan 3 of the appropriate size suction hole 31 and place it on the front end of the device, and splice the steel frame 62 inside the device with the excavation. bucket 5, and make its length suitable for the dept...

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Abstract

The invention provides a rotary drilling type sand-pumping hole-forming side wall high-pressure grouting device and a construction method. The rotary drilling type sand-pumping hole-forming side wall high-pressure grouting device is characterized in that an inner protection cylinder is sleeved with a floral tube in a wrapping mode, a steel protection cylinder is fixedly arranged on the portion, located on the lower portion, of the outer portion of the inner protection cylinder in a sleeving mode by a certain length, an annular cavity is formed between the inner protection cylinder and the floral tube, a grout storage layer is formed, an opening in the top end of the grout storage layer is blocked by a pressing sheet, the grout storage layer communicates with a grouting machine for grouting, a rotary type drawing disc is arranged in the bottom end of the inner protection cylinder in a spliced mode, a chain bucket device is arranged in the inner protection cylinder, and a plurality of evenly-distributed digging buckets used for digging sand are arranged on the chain bucket device. According to the rotary drilling type sand-pumping hole-forming side wall high-pressure grouting device, high-pressure grouting is conducted on the side wall of a pile hole while suction type drilling is conducted, and the foundation structure condition is improved through the technology in which the pile periphery is solidified through pressure grouting of the side wall of the pile hole.

Description

technical field [0001] The invention relates to a new hole forming method and the field of pile side reinforcement in a calcareous sand foundation, in particular to a rotary drilling type sand pumping type high pressure grouting device and a construction method for the side wall of the hole. Background technique [0002] Coral sand is coral or shell fragments, with the characteristics of continuous release of calcium carbonate, with different particle sizes and various specifications. The biggest feature of coral sand is that it is rich in micropores, has low strength, is easy to break, and is not easy to recover after structural damage. When a pile is formed in a calcareous sand foundation, because the calcareous sand will break down under a small stress, whether it is a driven pile or a cast-in-place pile, due to the disturbance to the calcareous sand foundation soil, the calcareous sand around the pile will be broken. After being squeezed, the particles are broken, resul...

Claims

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Application Information

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IPC IPC(8): E02D5/74E02D17/08
CPCE02D5/74E02D17/08
Inventor 刘杰陶鑫波王瑞红程其芬雷星宇王芳陈子悦张瀚包顺骆浩何卓文李远航
Owner CHINA THREE GORGES UNIV
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