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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: 2009-09-02
山西机械化建设集团有限公司 +1
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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 rammer

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

[0022] 2. According to the energy level, determine the distance between the tamping points and the form of the points. The equilateral triangle is the best, followed by the square. Generally, the ramming distance is 4.0m for 2000kN·m; 4.5m for 3000kN·m; 5m for 4000kN·m; 5m for 5000kN·m, and 5.5m for 6000kN·m.

[0023] 1.2 Retamping

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

[0025] 1.3 full ram

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

[0027] Full tamping uses tamping stamps to match 1 / 4 hammer diameter, which can be completed in one pass or two passes.

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

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Abstract

The invention belongs to the technical field of building foundation treatment, and in particular relates to a dynamic compaction semi-replacement construction process, which solves the problem that the dynamic compaction method in the prior art is not suitable for treating high-saturation general cohesive soil and collapsible loess foundation. The construction process of dynamic compaction semi-replacement, the steps of which are to lay the cushion first, and then use the rammer to ram 2 to 3 times. During the ramming, fillers are added to the rammed pit to form a crushed stone pier. The length of the crushed stone pier is less than the thickness of the soft soil layer. The invention effectively solves the problem that the direct dynamic tamping method is not effective for high-saturation general cohesive soil and collapsible loess foundation, and the construction is complicated and costly by the dynamic tamping replacement method. In the south of my country, where the climate is humid and rainy, and generally cohesive soil and highly saturated soil are widely distributed, the foundation treatment market is broad and has a 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 technique suitable for treating highly saturated general cohesive soil and collapsible loess foundation. Background technique [0002] The dynamic compaction method is a method in which a heavy hammer of tens of tons (generally 8-40t) is freely dropped from a height of tens of meters (generally 6-40m) to compact the soil strongly. With its powerful impact energy (generally 500-8000kN·m), dynamic compaction produces 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 (crack). Regarding the mechanism of the dynamic compaction method, Mena proposed the following four points: [0003] 1 Due to the existence of tiny bubbles, pore water is compressible. [0004] 2 Due to...

Claims

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Application Information

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Patent Type & Authority Patents(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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