Combined soil nailing construction method

A construction method and soil nailing technology, applied in excavation, infrastructure engineering, sheet pile walls, etc., can solve the problems of increased support displacement, difficulty under the steel bar, and inability to achieve reinforcement effects, so as to improve the pullout resistance and improve The grouting efficiency and the effect of avoiding the loss of mortar

Active Publication Date: 2013-01-16
HUNAN HENGDUN GEOTECHN GROUTING TECH +2
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Problems solved by technology

In addition, the creep of soft soil may significantly increase the support displacement and fail to achieve the expected strengthening effect
[0005] In addition, during construction, due to the loose, weak, and poor soil stability of the soil layer, the soil d

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Embodiment Construction

[0034] The present invention will be further described below with reference to the drawings.

[0035] figure 1 A drilling tool 100 according to the present invention is shown, which includes a steel pipe 11 used as a drill rod and a drill bit 12 arranged at the front end of the steel pipe 11.

[0036] Preferably, a connecting sleeve 14 can be used to connect a plurality of steel pipes 11 according to actual conditions to achieve the required drilling depth. The drill bit 12 of the drilling tool 100 is made of a material with strong penetrating power, so that the drilling tool 100 can penetrate various soil layers.

[0037] In use, the drilling tool 100 uses the steel pipe 11 to drill holes on the slope. In one embodiment, the driving device used is a portable drilling machine, such as a hand-held coal power drilling machine. After drilling, the steel pipe 11 remains in the hole without being pulled out and is used as a grouting pipe in the grouting process described below. Prefera...

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Abstract

The invention relates to a combined soil nailing construction method, which belongs to the field of geotechnical engineering, and includes the steps as follows: step 1, preliminary grouting is vertically performed at the top of a slope; step 2, earth is excavated to form a sloping surface, and bottom layer concrete is sprayed on the sloping surface; step 3, injected holes are distributed in a concrete surface formed in the step 2 and holes are drilled, wherein drill stems of drilling tools are steel pipes, and the steel pipes are left in the holes to serve as grouting pipes after the holes are formed; step 4, the grouting pipes are grouted, then rigid rod pieces are inserted in the pipes to form combined soil nails; step 5, panel tie pieces are placed on the sloping surface, and are enabled to be jointed with exposed heads of the rigid rod pieces in the step 4; and step 6, surface layer concrete is sprayed on the panel tie pieces, and the construction is completed. The method provided by the invention solves the supporting problem of soil layers with poor soil strength, and has the advantages of low construction cost and short construction period.

Description

Technical field [0001] The invention relates to a soil nail support construction method, more specifically to a combined soil nail support construction method suitable for loose soil foundation pits. Background technique [0002] Soil nailing is a new type of soil retaining technology used to maintain soil excavation and slope stability. Because of its low construction cost, simple method, fast speed and reliable construction quality, it is widely used in foundation pit engineering. [0003] The soil nailing support is highly dependent on the nature of the soil layer of the construction site. Generally speaking, the soil layer suitable for soil nailing should have a certain degree of cementation and compactness, such as sand, silt, gravel soil, plain fill and hard or hard plastic cohesive soil. [0004] However, for loose, weak, and weak soil layers, such as loose sand and soil layers with abundant underground water sources, traditional soil nail support, especially saturated clay ...

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Application Information

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IPC IPC(8): E02D17/02E02D5/76
Inventor 黄友汉曹剑书牛建东戴习东王克宏谭旭亮罗蓉刘毅
Owner HUNAN HENGDUN GEOTECHN GROUTING TECH
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