Method for protecting walls of punching piles in soft sand geology

A perforated pile and geological technology, which is applied to sheet pile walls, buildings, foundation structure engineering, etc., can solve problems such as the easy collapse of the perforated pile hole wall, and achieve the effect of improving the effect of grouting reinforcement, low cost and simple method

Inactive Publication Date: 2018-01-05
CHINA MCC20 GRP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention can effectively solve the problem that the hole wall of the perforated pile is easy to collapse in the weak sandy soil layer

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0011] The perforated pile wall protection method in the soft sand geology of the present invention, it comprises:

[0012] Step 1: First, measure and release the pile positions on site according to the blueprint, and clearly mark the pile positions;

[0013] Step 2: Use excavators or forklifts to level and compact the site where the piles are to be constructed to ensure the compactness of the upper sand layer, and cover a layer of 30cm thick clay at the same time, and embed it in the sand surface , making the surface closed;

[0014] Step 3: Install a 2-3 meter long steel casing at the pile position according to the pile diameter. The diameter of the casing is 10cm larger than the pile diameter, and the casing is 200-300mm above the ground;

[0015] Step 4: With the center of the pile position as the center of the circle and the casing as the boundary, grouting is carried out within the range of 1 times the pile radius outside the casing. The depth of grouting is determined ...

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Abstract

The invention relates to pile foundation construction, in particular to a method for protecting walls of punching piles in soft sand geology. The method comprises the steps that 1, pile positions aremeasured on site according to a blueprint, and the pile positions are marked; 2, a site where piles are planned to be constructed are rolled flat and compacted through an excavator or a forklift, thedegree of compactness of an upper sand layer is ensured, a layer of clay being 30 cm thick covers the sand layer while rolling is performed, the clay is embedded in the sand surface layer, and the surface is made to be closed; 3, steel protection tubes being 2-3 meters long are installed at the pile positions according to different pile diameters, the diameter of the protection tubes is 10 cm larger than the pile diameters, and the portions, exposed out of the ground, of the protection tubes are 200-300 mm; 4, grouting construction is performed outside the protection tubes within the width range of one time of the pile radius with the center of each pile position as the circle center and the corresponding protection tube as the boundary, and the grouting depth is determined by the thickness of the soft sand layer; and 5, maintenance is performed after grouting is completed, and the formal punching pile construction stage is started after grout reaches a certain degree of strength. By means of the method, the problem that hole walls of the punching piles in the soft sand layer are prone to collapsing is effectively solved.

Description

technical field [0001] The invention relates to pile foundation construction, in particular to a construction method for perforated piles in soft sand geology. Background technique [0002] In the deep and weak sandy stratum, when impact piles are used in the design, due to the soft and easy-to-collapse characteristics of the sandy soil layer, during the punching process, the vibration caused by the impact of the hammer head on the stratum and the surge of mud liquid will affect the hole. If there is a large disturbance in the wall, a steel casing with a length of 1.5 to 2 meters is usually used in the construction to prevent the hole wall from collapsing and causing buried hole accidents. However, when the thickness of the weak sandy soil layer is large, the conventional steel casing of 1.5-2 meters cannot meet the needs of on-site construction, and if a long casing is used, large machinery, vibrating hammers, mechanical arms, etc. must be used Equipment, and verticality c...

Claims

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Application Information

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IPC IPC(8): E02D5/38
Inventor 施群凯
Owner CHINA MCC20 GRP CORP
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