Miniature pile bridge structure for surface mine slope support

Abstract

The utility model discloses a micro pile bridge structure for surface mine slope support, which belongs to the technical field of slope support engineering and comprises a bridge deck, micro piles and pre-stressed anchor cables, the bridge deck is arranged on a slope crest walking platform, the micro piles are vertically arranged, pile bodies of the micro piles penetrate through a fault structure, the bridge deck is arranged at the tops of the micro piles, and the pre-stressed anchor cables are arranged on the micro piles. The micro piles and the bridge deck form a reinforced concrete supporting structure, and the pre-stressed anchor cables are arranged on the slope surface of the surface mine slope and penetrate through a potential sliding surface and a fault structure developed in the slope body. According to the utility model, a plurality of pre-stressed anchor cables are arranged at the slope surface before geological disasters such as collapse, collapse, ground fissure, settlement and the like occur at the initial stage of the surface mine slope to penetrate through a potential sliding surface and a fault structure developed in the slope body, so as to provide a horizontal anchoring force; a reinforced concrete supporting structure composed of the micro piles and the bridge deck slabs is arranged on the walking platform at the slope top, so that vertical adhesive force is provided, the stability of the slope of the stope is improved, and hidden danger is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of slope support engineering, and more specifically to a micro pile bridge structure used for open-pit mine slope support. Background Art

[0002] At present, the open-pit mine slopes formed by blasting and stripping have developed unfavorable geological conditions such as fault structures inside the slopes. However, as rapid mining and production continue to extend downward, the slope height continues to increase, and the slope stress is redistributed. The slope rock mass is affected by the geological structure, ground stress release, weathering and groundwater, which can easily cause geological disasters such as landslides, collapses, ground fissures, and subsidence, which seriously threaten the safety of transportation roads and the safety of deep mineral mining equipment. Utility Model Content

[0003] 1. Technical issues to be solved

[0004] In view of the problems existing in the prior art, the purpose of the utility model is to provide a micro-pile bridge structure for open-pit mine slope support. In the early stage of open-pit mine slope formation, before geological disasters such as landslides, collapses, ground fissures, and subsidence occur, multiple prestressed anchor cables are implemented on the slope surface to penetrate the potential sliding surface and the fault structure developed in the slope body to provide horizontal (lateral) anchoring force. A reinforced concrete support structure composed of micro-piles and bridge panels is implemented on the walking platform at the top of the slope to provide a vertical (longitudinal) bonding force, thereby improving the stability of the mine slope and reducing disaster risks.

[0005] 2. Technical solution

[0006] To solve the above problems, the utility model adopts the following technical solutions.

[0007] A micro pile bridge structure for supporting an open-pit mine slope comprises a bridge deck arranged on a walking platform on the top of the slope, micro piles and prestressed anchor cables. The micro piles are arranged vertically, and their pile bodies penetrate fault structures. The bridge deck is arranged on the tops of the micro piles. The micro piles and the bridge deck form a reinforced concrete support structure. The prestressed anchor cables are arranged on the slope surface of the open-pit mine slope, and penetrate potential sliding surfaces and fault structures developed in the slope.

[0008] Furthermore, the construction method comprises the following steps:

[0009] A. Clear the dangerous rocks and floating stones on the slope of the open-pit mine;

[0010] B. Implement multiple prestressed anchor cables on the slope surface of the open-pit mine to penetrate the potential sliding surface and the fault structure developed in the slope to provide horizontal anchoring force;

[0011] C. A reinforced concrete support structure consisting of micropiles and bridge deck is implemented on the walking platform at the top of the slope to provide vertical bonding force.

[0012] Furthermore, in step B, the prestressed anchor cable is of tension type; the cable body material is 8-12 bundles of 15.2mm diameter, 1860MPa low-relaxation bonded steel strands; the anchor cable hole diameter is 140mm, and the inclination angle is 15-20°; the grouting material is cement mortar with a lime-sand ratio of 1:0.5-1:1.

[0013] Furthermore, in step C, the micro pile is a vertical reinforced concrete circular pile, the pile body of which penetrates the fault structure, and the pile bottom is constructed to reach the complete hard bedrock below. The pile length is 25-40m, the pile diameter is 200-300mm, the micro piles are arranged in a plum blossom shape, the pile spacing is 2-3m, and the pile body is made of fine stone concrete with a concrete strength grade of C30.

[0014] Furthermore, in step C, after the micro-pile construction is completed, the pile head is connected to the bridge deck using C30 reinforced concrete to form an end-bearing pile-bridge composite structure. The pile-bridge composite structure works together with the prestressed anchor cable to form a longitudinal and transverse double bonding reinforcement for the unstable area of ​​the open-pit mine slope.

[0015] 3. Beneficial effects

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] By implementing multiple prestressed anchor cables on the slope surface, penetrating the potential sliding surface and the fault structure developed in the slope, horizontal (lateral) anchoring force is provided; a reinforced concrete support structure composed of micropiles and bridge panels is implemented on the walking platform at the top of the slope to provide a vertical (longitudinal) adhesion to bear the disturbance of the mine car transportation load to the unstable area of ​​the mine slope; micropile construction can improve the support progress efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the utility model;

[0019] Figure 2 and Figure 3 All of them are structural schematic diagrams of the bridge deck and micro piles of the utility model.

[0020] Description of the numbers in the figure:

[0021] 1. Bridge deck; 2. Micro piles; 3. Open-pit mine slope; 4. Fault structure; 5. Prestressed anchor cable. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model; it is obvious that the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the utility model without making creative work are within the scope of protection of the utility model.

[0023] Example:

[0024] A micro pile bridge structure for supporting an open-pit mine slope comprises a bridge deck 1, micro piles 2 and prestressed anchor cables 5 arranged on a walking platform on the top of the slope. The micro piles 2 are arranged vertically, and their pile bodies penetrate fault structures 4. The bridge deck 1 is arranged on the top of the micro piles 2. The micro piles 2 and the bridge deck 1 form a reinforced concrete support structure. The prestressed anchor cables 5 are arranged on the slope surface of the open-pit mine slope 3, and penetrate potential sliding surfaces and fault structures 4 developed in the slope.

[0025] The construction method includes the following steps:

[0026] A. Clear the dangerous rocks and floating stones on the slope of the open-pit mine;

[0027] B. Implement multiple prestressed anchor cables 5 on the slope surface 3 of the open-pit mine, penetrate the potential sliding surface and the fault structure 4 developed in the slope body, and provide horizontal anchoring force;

[0028] C. A reinforced concrete support structure consisting of micropiles 2 and bridge deck 1 is implemented on the walking platform at the top of the slope to provide vertical bonding force.

[0029] In step B, the prestressed anchor cable 5 is of tension type; its cable body material is 8-12 bundles of 15.2mm diameter, 1860MPa low relaxation bonded steel strands; its anchor cable hole diameter is 140mm, and the inclination angle is 15-20°; the grouting material is cement mortar with a lime-sand ratio of 1:0.5-1:1.

[0030] In step C, the micro pile 2 is a vertical reinforced concrete circular pile, the pile body of which penetrates the fault structure 4, and the pile bottom is constructed to reach the complete hard bedrock below. The pile length is 25-40m, the pile diameter is 200-300mm, the micro pile 2 is arranged in a plum blossom shape, the pile spacing is 2-3m, and the pile body is made of fine stone concrete with a concrete strength grade of C30.

[0031] In the step C, after the construction of the micropile 2 is completed, the pile head is connected to the bridge deck 1 using C30 reinforced concrete to form an end-bearing pile-bridge composite structure. The platform can bear the mine car transportation load, reducing the disturbance of the mine car transportation dynamic load to the unstable area of ​​the mining area slope. The pile-bridge composite structure and the prestressed anchor cable 5 work together to form a longitudinal and transverse double bonding reinforcement for the unstable area of ​​the open-pit mine slope 3, thereby improving the physical and mechanical strength of the rock mass of the unstable area slope and improving the anti-slip ability of the overall slope.

[0032] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A micro pile bridge structure for open-pit mine slope support, characterized in that: The invention comprises a bridge deck (1) arranged on a walking platform at the top of a slope, a micropile (2) and a prestressed anchor cable (5); the micropile (2) is arranged vertically, and its pile body penetrates a fault structure (4); the bridge deck (1) is arranged on the top of the micropile (2); the micropile (2) and the bridge deck (1) form a reinforced concrete support structure; the prestressed anchor cable (5) is arranged on the slope surface of an open-pit mine slope (3) and penetrates a potential sliding surface and a fault structure (4) developed in the slope.

2. The micro pile bridge structure for open-pit mine slope support according to claim 1 is characterized in that: The construction method includes the following steps: A. Clear the open-pit mine slope (3) of dangerous rocks and floating stones on the slope; B. Implement multiple prestressed anchor cables (5) on the slope surface of the open-pit mine (3), penetrate the potential sliding surface and the fault structure (4) developed in the slope body, and provide horizontal anchoring force; C. A reinforced concrete support structure consisting of micropiles (2) and the bridge deck (1) is implemented on the walking platform at the top of the slope to provide vertical bonding force.

3. The micro pile bridge structure for open-pit mine slope support according to claim 2 is characterized in that: In step B, the prestressed anchor cable (5) is of tension type; its cable body material is 8-12 bundles of 15.2mm diameter, 1860MPa low relaxation bonded steel strands; its anchor cable hole diameter is 140mm, and the inclination angle is 15-20°; the grouting material is cement mortar with a lime-sand ratio of 1:0.5-1:

1.

4. The micro pile bridge structure for open-pit mine slope support according to claim 2 is characterized in that: In step C, the micro pile (2) is a vertical reinforced concrete circular pile, the pile body of which penetrates the fault structure (4), and the pile bottom is constructed to reach the complete hard bedrock below. The pile length is 25-40m, the pile diameter is 200-300mm, the micro pile (2) is arranged in a plum blossom shape, the pile spacing is 2-3m, and the pile body is made of fine stone concrete with a concrete strength grade of C30.

5. The micro pile bridge structure for open-pit mine slope support according to claim 2 is characterized in that: In step C, after the construction of the micropile (2) is completed, the pile head is connected to the bridge deck (1) using C30 reinforced concrete to form an end-bearing pile-bridge composite structure. The pile-bridge composite structure and the prestressed anchor cable (5) work together to form a longitudinal and transverse double bonding reinforcement for the unstable area of ​​the open-pit mine slope (3).

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