A rotary drilling type high-pressure grouting device and construction method for the side wall of the hole formed by pumping sand

A high-pressure grouting and hole-forming technology, which is applied to the high-pressure grouting device and the construction field for the side wall of the rotary drilling type sand pumping hole formation, can solve the problem that the calcareous sand foundation cannot be well applied and reduce the friction between the calcareous sand particles. , pile hole collapse and other problems, to achieve the effect of preventing collapse, saving materials and improving bearing capacity

Active Publication Date: 2022-06-21
SHENZHEN LOTUT INNOVATION DESIGN CO LTD
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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 calcareous sand foundation, lubricating the interior of the calcareous sand, reducing the friction between the calcareous sand particles, and finally the remaining mud skin hung on the side wall of the pile hole, and the mud skin Gravity is greater than the cohesive force between calcareous sands, resulting in the collapse of pile holes. Therefore, traditional mud retaining walls cannot be well applied to calcareous sand foundations

Method used

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  • A rotary drilling type high-pressure grouting device and construction method for the side wall of the hole formed by pumping sand
  • A rotary drilling type high-pressure grouting device and construction method for the side wall of the hole formed by pumping sand
  • A rotary drilling type high-pressure grouting device and construction method for the side wall of the hole formed by pumping sand

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Embodiment 1

[0047] see Figure 1-4 , a rotary drilling type high-pressure grouting device for sand pumping into the side wall of the hole, which comprises an inner casing 1, the outer part of the inner casing 1, and a length of the upper part of the casing is wrapped with a flower tube 2, the inner casing The outer part of the protective tube 1, and is located in the lower part of the remaining length of the fixed sleeve with a steel protective tube 22, an annular cavity is formed between the inner protective tube 1 and the flower tube 2, and constitutes a slurry storage layer 11, the slurry storage layer 11 The top opening of the inner casing 1 is blocked by pressing sheet 21; the slurry storage layer 11 is communicated with the grouting machine 7 used for grouting; the bottom end of the inner casing 1 is spliced ​​with a rotary drawer 3, 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 ch...

Embodiment 2

[0062] The method of using any one of the rotary drilling type sand extraction and hole forming side wall high pressure grouting device for construction includes the following steps:

[0063] S1: Carry out land leveling in the construction area and remove sundries, make a unified arrangement for the mud pool, suction machine, grouting machine and construction access road in the construction area to facilitate construction, and investigate 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, select the appropriate size of the suction tray 3 of the suction hole 31 according to the average particle size of the calcareous sand under the foundation measured before construction, and place it at the front of the device, splicing the steel frame 62 inside the device and the digging plate 3 Buc...

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Abstract

The invention provides a rotary drilling type sand pumping hole-forming side wall high-pressure grouting device and construction method. The outer casing of the inner casing is wrapped with flower tubes. A steel casing is set, an annular cavity is formed between the inner casing and the flower tube, and a slurry storage layer is formed, and the top opening of the slurry storage layer is sealed with a pressing sheet; the slurry storage layer is used for The grouting machines for grouting are connected; the bottom of the inner casing is spliced ​​with a rotary drawer, and the inside of the inner casing is provided with a chain bucket device, and the chain bucket device is provided with multiple Evenly spaced buckets for digging sand. The device realizes high-pressure grouting on the side wall of the pile hole while suction drilling, and improves the foundation structure condition through the pressure grouting on the side wall of the pile hole to solidify the pile circumference.

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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Patent Type & Authority Patents(China)
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 SHENZHEN LOTUT INNOVATION DESIGN CO LTD
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