Strong ramming semi-replacement construction technique

A construction technology and a technology for ramming pits, which are applied in the field of dynamic compaction semi-replacement construction technology, can solve problems such as being unsuitable for general cohesive soil and collapsible loess foundation, etc., and achieve the effect of good application prospects.

Active Publication Date: 2008-03-19
山西机械化建设集团有限公司 +1
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AI Technical Summary

Problems solved by technology

[0011] In order to solve the problem that the dynamic compaction method in the prior art is not suitable for dealing with high-saturation general cohesive soil and collapsible loess foundation, the present invention provides a dynamic compaction semi-replacement construction process

Method used

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Embodiment Construction

[0019] 1. Parameter design

[0020] 1.1 point ramming

[0021] 1 Determine the energy level according to the processing depth requirements.

[0022] 2 According to the energy level, determine the spacing of the tamping points and the form of the points, and the equilateral triangle is the best, followed by the square. Generally, 2000kN·m tamping distance is 4.0m; 3000kN·m tamping distance is 4.5m; 4000kN·m tamping distance is 5m;

[0023] 1.2 Reconsolidation

[0024] The re-tamping is carried out at the origin of the point ramming, and the energy level is 1 / 2 of the point ramming point.

[0025] 1.3 Full Ram

[0026] The full ramming energy level is determined according to the point ramming energy level. Below 4000kN·m, choose 1000-1500kN·m; above 4000kN·m, choose 2000kN·m.

[0027] The full ramming adopts the ramming stamp to match the 1 / 4 hammer diameter, and it can be completed once or twice.

[0028] The number of single hits is generally 3 to 6 hits. When the design...

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Abstract

The present invention belongs to the foundation ground treatment technical field, in particular to a heavy tamping semi replacement construction process, which solves the problem of the prior art that the heavy tamping method is not suitable for treating the high saturation general clay foundation and the collapsible loess foundation. The heavy tamping semi replacement construction process has the following steps that: firstly, an under layer is laid, and then is tamped 2 to 3 times with a rammer, in the process of tamping, filling material is added into a tamping pit to form a macadam pier, and the length of the macadam pier is less than the thickness of soft soil. The present invention effectively solves the problems that the effect is not good when the general clay foundation and the collapsible loess foundation adopt the direct tamping method, and the construction is complex and the cost is high when the heavy tamping replacement method is adopted. The climate in our country is humid and has a lot of rain, and the foundation treatment market is wide in the south area widely distributed with the general clay and the high-saturated soil, and the present invention has good application prospect.

Description

technical field [0001] The invention belongs to the technical field of building foundation treatment, in particular to a dynamic compaction semi-replacement construction process suitable for treating high-saturation general cohesive soil and collapsible loess foundation. Background technique [0002] The dynamic compaction method is a method in which dozens of tons (usually 8-40t) heavy hammers are freely dropped from a height of tens of meters (usually 6-40m), and the soil is strongly compacted. With its strong impact energy (generally 500-8000kN m), dynamic compaction generates a large shock wave and stress in the soil, causing a series of instantaneous effects of pore compression in the soil, and causing local liquefaction of the soil and accelerated drainage. pathway (fissure). Regarding the mechanism of dynamic compaction, Mena made the following four points: [0003] 1 Pore water is compressible due to the presence of tiny air bubbles. [0004] 2 Due to the repeated...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D3/046E02D3/08
Inventor 李保华郝玉柱安明张循当杨印旺王永强郭伟林刘淑芳霍瑞琴岳效宁闫续屏冯廷华
Owner 山西机械化建设集团有限公司
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