Soil nailing wall construction method for pre-reinforcing side slope rock-soil body

Abstract

The invention discloses a soil nailing wall construction method for pre-reinforcing a side slope rock-soil body, which comprises the following steps of: firstly, vertical layered horizontal running water construction is performed on a current side slope surface, holes are drilled in the side slope rock-soil body according to a certain angle, and the drilled holes penetrate through the to be excavated rock-soil body and enter a preset depth in the designed side slope rock-soil body through the designed side slope surface of the side slope; then, soil nails are inserted into the drilling section in the designed side slope rock-soil body from a current side slope surface hole opening following the drilling, and the drilling section provided with the soil nails is grouted and maintained to be strong; and finally, the rock-soil body to be excavated is excavated through layered horizontal running water construction according to the sequence from top to bottom, the designed slope surface of the slope is exposed in a layered mode, slope surface net hanging and concrete spraying operation is completed, and the process is repeatedly circulated to achieve vertical running water construction till the soil nailing wall supporting construction is completed after the first-stage slope is excavated in a layered mode. The temporary stability of the designed slope surface after layered excavation can be guaranteed, vertical flow construction and horizontal flow construction can be conveniently carried out at the same time, the construction efficiency is improved, and the phenomenon of idling of the construction site is avoided.

Description

technical field [0001] The invention relates to the technical field of slope reinforcement, in particular to a soil nailing wall construction method for pre-reinforced slope rock and soil mass. Background technique [0002] Soil Nailing Wall (Soil Nailing Wall) is a kind of in-situ rock-soil mass reinforced by high-strength materials such as steel bars, thereby improving the "visual cohesion" and strength of the in-situ rock-soil mass, making soil nails and shotcrete surfaces The in-situ soil reinforcement technology of "gravity-seeking retaining wall" formed by the layer and the reinforced rock-soil mass is very different from the original rock-soil mass, and is widely used in slope and foundation pit reinforcement projects. [0003] At present, the drilling and grouting type soil nails are mainly used in the reinforcement and treatment of slopes and foundation pit soil nail walls in my country. The soil nail wall shall be constructed according to the principle of "top-dow...

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Problems solved by technology

[0005] However, since the first layer of slope rock and soil is excavated and the anchor solid is maintained and the soil nails play a role, it is the most dangerous stage during the construction period. ) vibration, excavation and unloading of rock and soil, vibration caused by blasting or earthquake, and other events, it is difficult to guarantee the temporary stability of the slope during construction

[0006] In view of the following disadvantages in the current soil nailing wall support technology: ①Soil nailing walls usually adopt layered excavation to expose the slope surface, and then drill holes on the exposed design slope surface, insert soil nails, grout for strengthening, The construction process such as hanging nets on the slope surface and spraying concrete curing to be strengthened is difficult to realize the rock and soil excavation concept of "support first and then dig".

After the excavation of a layer of rock and soil, it is difficult to guarantee the stability of the slope under the disturbance of the subsequent construction of this layer; ②Only when the soil nail anchors of a certain layer and the shotcrete on the slope reach the strength required by the design, can the slope be carried out The excavation, soil nailing, net hanging and sprayed concrete operations of the next layer of rock and soil are not conducive to shortening the construction period; Stability usually adopts the principle of segmental excavation and segmental anchoring, the construction efficiency is low, and it is easy to appear the phenomenon of nest work; It is difficult to guarantee the temporary stability during the construction period before the action

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