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Structured cemented gravel pile and construction method thereof

A construction method and technology of crushed stone piles, which are applied in basic structure engineering, soil protection, construction, etc., can solve problems such as cement slurry polluting sea water, semi-rigid piles cannot meet foundation deformation, and construction progress is slow, so as to improve resistance Capability of horizontal load, increased strength and stiffness, less pollution effect

Active Publication Date: 2018-08-17
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Semi-rigid piles cannot meet the requirements of foundation deformation. At the same time, the grouted gravel piles are grouted to reinforce the gravel after the soil is consolidated. Not only the construction progress is slow, but the injected cement slurry will pollute the seawater

Method used

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  • Structured cemented gravel pile and construction method thereof
  • Structured cemented gravel pile and construction method thereof
  • Structured cemented gravel pile and construction method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Such as figure 2 As shown, the construction result of this embodiment is a structured cemented crushed stone pile 100 with a single-stage cemented crushed stone pile body 1, with a diameter of 500 mm, and the cemented crushed stone pile body 1 is located at the top of the pile. The length of the stone pile 1 is 2m, the particle size of the crushed stone 4 is 30-80mm, the self-compacting cement-based material 3 adopts the self-compacting cement paste, the expansion of the self-compacting cement paste is 260mm, and the V-shaped funnel time is 2.57s .

[0047] The specific construction steps are as follows:

[0048] S1: Perform on-site in-situ tests according to design requirements to determine that the void ratio of the compacted aggregate 4 is 0.3, and the expansion degree of the self-compacting cement-based material 3 used to form the cemented aggregate pile 1 is 260mm, V-shaped funnel Passing time is 2.57s;

[0049] S2: Pile hole 5 is formed during construction;

[0050] S3...

Embodiment 2

[0053] Such as image 3 As shown, the construction result of this embodiment is a structured cemented gravel pile 100 with a multi-section cemented crushed stone pile body 1. The structured cemented crushed stone pile 100 is applied to sea reclamation projects, and the multi-section cemented crushed stone pile body 1 Located at the top of the pile and the bottom of the pile, the diameter of the pile is 500mm, the length of the cemented gravel at the top of the pile is 2m, the length of the cemented gravel at the bottom of the pile is 2.5m, and the particle size of the gravel 4 is 30 -50mm, self-compacting cement-based material 3 adopts underwater self-protecting self-compacting cement paste, the expansion degree of underwater self-protecting self-compacting cement paste is 280mm, and the V-shaped funnel time is 2.0s.

[0054] The specific construction steps are as follows:

[0055] S1: Perform on-site in-situ tests according to design requirements to determine that the void ratio o...

Embodiment 3

[0062] Such as Figure 4 As shown, the construction result of this embodiment is a structured cemented gravel pile group. According to the calculation of the engineering structure, the structured cemented gravel pile group includes a variety of structured cemented gravel piles 100, and part of the pile tops are poured Cemented gravel pile body 1 is formed, the middle of the pile body of part of the pile is poured to form cemented gravel pile body 1, the top of the pile of part of the pile body is poured to form cemented gravel pile body 1, and the pile body of some piles includes multiple cemented gravel piles Pile body 1.

[0063] The structured cemented crushed stone piles 100 of this embodiment are arranged in groups, and the position of the cemented crushed stone pile body 1 of each pile in the pile group realizes the optimal design of structural performance through structural calculation, thereby improving the stability of the entire reinforced foundation.

[0064] According t...

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Abstract

The invention discloses a structured cemented gravel pile and a construction method thereof. The structured cemented gravel pile comprises a cemented gravel material pile body and a gravel material pile body. The construction method of the structured cemented gravel pile comprises the following steps of 1, an on-site in-situ test is performed according to design requirements to determine the porosity ratio of a gravel material in the compact accumulation process and the expansion degree and viscosity of a self-compacting cement-based material used for forming a cemented gravel material; 2, construction is carried out on the ground to form a pile hole; 3, the gravel material is backfilled into the pile hole to form the gravel material pile body, and the gravel material pile body is vibratedby adopting a vibrator until the porosity ratio of the gravel material reaches a preset value; and 4, the self-compacting cement-based material is poured into the pile hole so as to bond a part of the gravel material in the gravel material pile body to form the cemented gravel material pile body. According to the structured cemented gravel pile, the water permeability of the gravel pile is kept,the strength and the rigidity of the structured cemented gravel pile are increased, and the capability of supporting the horizontal load of the structured cemented gravel pile is improved.

Description

Technical field [0001] The invention relates to the field of foundation engineering reinforcement, in particular to a structured cemented gravel pile and a construction method thereof. Background technique [0002] Crushed stone pile is a traditional foundation treatment method. Firstly, the pile hole is constructed by vibrating sinking pipe, hammering sinking pipe or impacting to empty the pile, and then backfilling gravel material into the pile hole and vibrating to compact, finally forming gravel pile Pile. The gravel piles are usually arranged in the form of piles, and the gravel piles and the soil between the piles interact to form a composite bearing system, thereby improving the bearing capacity of the foundation and reducing the compression deformation of the foundation. The vibro-compacted crushed stone still has a connected pore structure, which has good water permeability. When the soil around the pile is consolidated, the gravel pile acts as a drainage channel and ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D3/08
CPCE02D3/08
Inventor 金峰周虎王刚黄杜若王卫
Owner TSINGHUA UNIV
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