Mine roadway assembly type U-shaped steel arch support structure

Abstract

The utility model provides a mine roadway assembly type U-shaped steel arch support structure which comprises a plurality of support units arranged in an arrayed mode, each support unit comprises a support leg, a top arch beam is arranged on the top of the support leg, contact plates are arranged on the inner sides of the support leg and the top arch beam, and the mine roadway assembly type U-shaped steel arch support structure further comprises a U-shaped clamp and an anchor rod. The opening end of the U-shaped clamp is buckled on the inner side of the supporting leg, one end of the anchor rod is connected to the U-shaped clamp through threads, and the other end of the anchor rod extends towards the outer side of the supporting leg. The device further comprises a plurality of connecting steel belts which connect the supporting units in series. The U-shaped steel arch support structure and a mine roadway are constructed and installed in a non-welding mode. And specifically, the connecting parts are connected through bolts, welding connection can be replaced, fire operation in the steel arch supporting process is eliminated fundamentally, fire accidents are restrained, and construction safety is improved.

Description

Technical Field

[0001] The utility model relates to the field of mine tunnel support equipment, in particular to an assembled U-shaped steel arch support structure for a mine tunnel. Background Art

[0002] During the construction of mine infrastructure, renovation and expansion, and mining and production period, the transportation tunnels and outer tunnels of the main mining area are usually designed at the junction of ore and rock. The geological structure of this area is complex and the rock structure is unstable, which brings many inconveniences to the construction. When encountering Class IV and V surrounding rocks during the construction process, the conventional method adopts U-shaped steel arch frame or shotcrete comprehensive support method. During the arch frame support process, resin anchor rods need to be applied to the two sides and the top of the tunnel for connection and fixation, and steel bars are used to connect the arch frames. In the existing construction process, it is necessary to use hot work to cut the anchor rods and weld the steel bars to form a unified whole to ensure that the arch frame is evenly stressed. However, welding hot work can easily bring fire risks to the underground. As a result, mine fire accidents occur frequently, causing casualties. In order to learn from the lessons of the accidents, the mine "double reduction of hot work" is now fully carried out to ensure the safety of mine support construction. In view of this, an assembled U-shaped steel arch frame support structure for mine tunnels is proposed. Summary of the invention

[0003] The technical problem to be solved by the utility model is to solve the fire hazard caused by the welding hot work of the existing U-shaped steel arch frame during the tunnel construction process.

[0004] The technical solution adopted by the utility model to solve its technical problems is:

[0005] Provided is a mine tunnel assembled U-shaped steel arch support structure, comprising a plurality of support units arranged in an array, each of the support units comprising a support leg, a top arch beam being arranged on the top of the support leg, a contact plate being arranged on the inner side of the support leg and the top arch beam, and first connection holes being arranged at both ends of the contact plate;

[0006] It also includes a U-shaped card and an anchor rod, the open end of the U-shaped card is buckled on the inner side of the support leg, second connecting holes are provided at both ends of the U-shaped card, one end of the anchor rod is connected to the second connecting hole by a thread, and the other end of the anchor rod extends to the outside of the support leg.

[0007] It also includes a plurality of connecting steel belts, which are connected between adjacent supporting units, wherein the ends of the connecting steel belts are connected to the first connecting holes of the contact plate by bolts, so as to connect the plurality of supporting units in series.

[0008] Preferably, the supporting legs and the top arch beam are two-body structures, and connecting arc plates are provided on the outer sides of the connecting ends of the top arch beam and the supporting legs. The connecting arc plates are respectively connected to the top arch beam and the supporting legs by bolts to fix the two.

[0009] Preferably, the connecting hole is a waist hole structure.

[0010] Preferably, the contact plate is mounted on the support leg or the top arch beam by bolts.

[0011] Preferably, the contact plate connected to the top arch beam has a curved surface facing the inner side surface of the top arch beam.

[0012] Preferably, a clamping plate is provided on the outer side of the supporting leg and the top arch beam, the anchor rod passes through the clamping plate and is connected to the U-shaped clip, and the anchor rod is connected to the clamping plate by threads.

[0013] Preferably, the distance between adjacent support units is 1m-1.2m.

[0014] Preferably, a wire mesh is provided on the outer side of the support unit, wherein the wire mesh is tied to the supporting legs and the top arch beam by steel wires.

[0015] The beneficial effect of the utility model is that the U-shaped steel arch support structure in the utility model is installed in the mine tunnel construction in a non-welding form. Specifically, the connecting parts are connected by bolts, which can replace the welding connection, eliminate the hot work in the steel arch support process from the root, curb the occurrence of fire accidents, and improve the construction safety.

[0016] In addition, a non-welded U-shaped steel arch frame structure is adopted, which has a simple structure and is easy to assemble, thus reducing labor intensity, saving costs and improving construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 This is a schematic diagram of the first structure of the support unit provided by the embodiment of the utility model;

[0019] Figure 2 This is a schematic diagram of a second structure of a support unit provided by an embodiment of the utility model;

[0020] Figure 3 This is a schematic diagram of a third structure of a support unit provided by an embodiment of the utility model;

[0021] Figure 4 yes Figure 3 The enlarged structural diagram at A in the middle;

[0022] Figure 5 It is a schematic diagram of the structure of the U-shaped steel arch frame after construction provided by the embodiment of the utility model;

[0023] In the figure: 1-support leg, 2-top arch beam, 3-connection plate, 3.1-first connecting hole, 4-U-shaped card, 4.1-second connecting hole, 5-anchor rod, 6-clamp plate, 7-bottom plate, 8-connecting steel belt, 9-connecting arc plate. DETAILED DESCRIPTION

[0024] The above scheme is further described below in conjunction with specific examples. It should be understood that these examples are used to illustrate the utility model rather than to limit the scope of the utility model. The implementation conditions used in the examples can be further adjusted according to the conditions of the specific manufacturer, and the implementation conditions not specified are usually the conditions in conventional experiments.

[0025] In a specific embodiment, an assembled U-shaped steel arch support structure for a mine tunnel is provided, which includes a plurality of support units arranged in an array, wherein each support unit includes a support leg 1, and a top arch beam 2 is arranged on the top of the support leg 1 to form an arch support frame.

[0026] In this example, a contact plate 3 is provided on the inner side of the support leg 1 and the top arch beam 2, and first connection holes 3.1 are provided at both ends of the contact plate 3;

[0027] In this example, a U-shaped card 4 and an anchor rod 5 are also included. After installation, the open end of the U-shaped card is buckled on the inner side of the support leg 1, and a second connecting hole 4.1 is provided at both ends of the U-shaped card. One end of the anchor rod 5 is connected to the second connecting hole 4.1 by a thread, and the other end of the anchor rod 5 extends to the outside of the support leg 1 and is fixed to the tunnel rock. The support unit is fixed by the anchor rod 5, and the threaded connection between the anchor rod 5 and the second connecting hole 4.1 can replace welding construction to avoid welding fire.

[0028] In order to arrange the supporting structure along the lane, this example also includes a plurality of connecting steel belts 8, which are connected to the contact plates 3 of the adjacent supporting units. Specifically, the ends of the connecting steel belts 8 are connected to the first connecting holes 3.1 by bolts. To further facilitate the connection and adjustment between the connecting steel belts 8 and the contact plates 3, the connecting holes 3.1 are preferably set as waist hole structures, which can realize the lateral adjustment of the connecting steel belts 8 during the installation process. In addition, multiple supporting units can be connected in series to form a supporting whole, which can also replace welding installation.

[0029] Therefore, threaded connections can be used on the support units instead of welding connections, thus eliminating hot work during steel arch support, effectively preventing and resolving safety risks, curbing accidents, and promoting the overall level of mine safety production.

[0030] In order to ensure the support strength and installation convenience to facilitate manual work, the distance between adjacent support units is set to 1m-1.2m, and the spacing of the steel arch frame is preferably set to 1m. Each support unit uses 12 Φ25mm anchor rods 5 and 6 sets of U-shaped clips 4 to connect the legs 1 and the top arch beam 2; between the support units, 10 950mm connecting steel belts 8 are used to connect, and a bottom plate 7 is set at the bottom of the leg 1 to improve the stability of the leg 1 and facilitate the vertical placement of the support unit during construction. In addition, the U-shaped clip 4 is made of 20mm thick steel plate, and the thickness of the connecting steel belt 8 is 20mm.

[0031] In addition, the support structure can be designed and adjusted according to the height and span parameters of different tunnels to ensure the reliability and applicability of tunnel support.

[0032] During construction, the contact plate 3 and the bottom plate 7 are first fixed to the legs 1 and the top arch beam 2 on the ground, and then the above components are transported to the construction site. First, the installation position of each support unit is adjusted, and then the anchor rod position is determined and the anchor rod is driven in. Then the U-shaped clip 4 is buckled on the inner side of the leg 1 and the top arch beam 2, and pre-connected with the U-shaped clip 4, and then the adjacent support units are pre-connected by connecting the steel belt 8. Finally, after all the corresponding positions are determined, pre-tightening is performed to achieve the anchor rod pulling the U-shaped clip 4, thereby achieving the fixation of the support unit and the tunnel rock wall, and multiple support units are connected to achieve the construction of the arch support structure. In order to further improve the anchor rod to fix the legs 1 and the top arch beam 2 in both the horizontal and longitudinal directions, a clamping plate 6 is arranged on the outside of the legs 1 and the top arch beam 2, and the anchor rod 5 passes through the clamping plate 6 to connect with the U-shaped clip, and the anchor rod 5 is connected to the clamping plate 6 by threads, that is, the legs 1 or the top arch beam 2 are clamped by the U-shaped clip and the clamping plate 6.

[0033] Therefore, a non-welded assembled U-shaped steel arch frame structure is adopted, which has a simple structure and is easy to assemble, reducing labor intensity, saving costs, and improving construction efficiency. In addition, no hot work is required, and the hot work approval process is cancelled, saving management personnel time; at the same time, no special operations personnel or fire watchers are required, reducing labor costs. The reinforcement welding operation of each arch frame takes 8 hours, saving 4 hours of time for each arch frame, and the daily salary of welders and fire watchers is 500 yuan. Each arch frame saves 500 / 2*2=500 yuan in labor costs, saving construction costs.

[0034] During construction, in order to facilitate the transportation of the supporting unit into the tunnel, the legs 1 and the top arch beam 2 are configured as a two-body structure, and a connecting arc plate 9 is provided on the outer side of the connecting end of the top arch beam 2 and the legs 1. The connecting arc plate 9 is respectively connected to the top arch beam 2 and the legs 1 by bolts to fix the two. The legs 1 and the top arch beam 2 can be disassembled during transportation and assembled in the tunnel during construction.

[0035] In addition, the contact plate 3 is installed on the support leg 1 or the top arch beam 2 by bolts, and can be installed on site in the tunnel, which is convenient for adjustment during installation. On this basis, in order to enable the contact plate 3 to completely fit the inner curved surface of the top arch beam 2, the end surface of the contact plate 3 facing the top arch beam 2 is a curved surface, which can be fitted with the top arch beam 2 after installation to improve the connection strength.

[0036] In addition, in order to prevent the rock fragments from falling off the tunnel wall and causing casualties, a wire mesh is set on the outside of the support unit, wherein the wire mesh is tied to the support leg 1 and the top arch beam 2 by steel wires to facilitate loading and unloading, while also avoiding welding and hot work.

[0037] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without departing from the technical concept of the invention through the above description. The technical scope of the invention is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A U-shaped steel arch support structure for a mine tunnel, comprising a plurality of support units arranged in an array, each of the support units comprising a support leg (1), a top arch beam (2) being arranged on the top of the support leg (1), characterized in that: A contact plate (3) is provided on the inner side of the supporting leg (1) and the top arch beam (2), and first connection holes (3.1) are provided at both ends of the contact plate (3); It also comprises a U-shaped clip (4) and an anchor rod (5), wherein the open end of the U-shaped clip (4) is buckled on the inner side of the leg (1), and second connection holes (4.1) are provided at both ends of the U-shaped clip, one end of the anchor rod (5) is connected to the second connection hole (4.1) by means of a thread, and the other end of the anchor rod (5) extends toward the outer side of the leg (1); It also includes a plurality of connecting steel belts (8), wherein the connecting steel belts (8) are connected between adjacent supporting units, wherein the ends of the connecting steel belts (8) are connected to the first connecting holes (3.1) of the contact plate (3) via bolts, thereby connecting the plurality of supporting units in series.

2. The assembled U-shaped steel arch support structure for a mine tunnel as claimed in claim 1, characterized in that: The supporting leg (1) and the top arch beam (2) are two-body structures, and a connecting arc plate (9) is arranged on the outer side of the connecting end of the top arch beam (2) and the supporting leg (1), and the connecting arc plate (9) is connected to the top arch beam (2) and the supporting leg (1) respectively by bolts to fix the two.

3. The assembled U-shaped steel arch support structure for a mine tunnel as claimed in claim 1, characterized in that: The connecting hole (3.1) is a waist hole structure.

4. The assembled U-shaped steel arch support structure for a mine tunnel as claimed in claim 1, characterized in that: The contact plate (3) is mounted on the supporting leg (1) or the top arch beam (2) by means of bolts.

5. The assembled U-shaped steel arch support structure for a mine tunnel as claimed in claim 4, characterized in that: The contact plate (3) connected to the top arch beam (2) has a curved surface facing the inner side surface of the top arch beam (2).

6. The assembled U-shaped steel arch support structure for a mine tunnel as claimed in claim 1, characterized in that: A clamping plate (6) is arranged on the outside of the supporting leg (1) and the top arch beam (2); the anchor rod (5) passes through the clamping plate (6) and is connected to the U-shaped clip (4); and the anchor rod (5) and the clamping plate (6) are connected by threads.

7. The assembled U-shaped steel arch support structure for a mine tunnel as claimed in claim 1, characterized in that: The distance between adjacent support units is 1m-1.2m.

8. The assembled U-shaped steel arch support structure for a mine tunnel as claimed in claim 1, characterized in that: A wire mesh is arranged on the outside of the support unit, wherein the wire mesh is tied to the support legs (1) and the top arch beam (2) by means of steel wires.

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