Bracket fixing structure

Abstract

To provide a bracket fixing structure that allows the angle of the bracket relative to the hole wall to be adjusted vertically and horizontally. [Solution] The bracket fixing structure 1 of the present invention comprises a fixing member 10 fixed to the tunnel wall A, a bracket 20 extending from the tunnel wall A toward the inside of the tunnel, an adjustment member 30 connecting the fixing member 10 and the bracket 20, and a support member 40 supporting the bracket 20 by applying a reaction force to the tunnel wall A below the bracket 20, wherein the adjustment member 30 comprises a first member 31, a second member 32, a plurality of adjustment bolts 33, and a plurality of nuts 34, and the surface of the second plate 31a facing the tunnel wall A abuts against a hemisphere 31c, a plurality of second communicating holes 32b are connected to the plurality of adjustment bolts 33, and nuts 34 are screwed onto the tips of the adjustment bolts 33, thereby fixing the bracket 20 to the tunnel wall A in such a way that the angle can be adjusted vertically and horizontally.

Description

[Technical Field]

[0001] The present invention relates to a bracket fixing structure, and more particularly to a bracket fixing structure that allows the angle of the bracket relative to the wall of a hole to be adjusted both vertically and horizontally. [Background technology]

[0002] In mountain tunnel construction, construction equipment such as total stations are installed on the tunnel walls to ensure wide access routes for construction vehicles and make effective use of the limited tunnel space.In addition to total stations, the construction equipment installed on the tunnel walls is diverse, including rails for moving work carts, belt conveyors, photographic devices such as face monitoring cameras, piping, communication devices such as wireless access points, lighting fixtures, warning lights, etc. To install the construction equipment on the tunnel wall, brackets made of steel beams braced in a diagonal brace shape are fixed to the tunnel wall at predetermined intervals in the axial direction of the tunnel, and the construction equipment is supported by the brackets (Patent Documents 1 to 3). The bracket is fixed to the hole wall by drilling a long hole horizontally in the hole wall using a construction machine such as a drill jumbo, injecting grout into the long hole, inserting a rock bolt to secure it in place, and connecting the bracket to the head of the rock bolt. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-199708 [Patent Document 2] Japanese Patent Application Publication No. 2019-105471 [Patent Document 3] Japanese Patent Application Laid-Open No. 2001-280059 Summary of the Invention [Problem to be solved by the invention]

[0004] It is difficult to accurately drill holes in tunnel walls with uneven surfaces, such as those made of sprayed concrete, and the drilling direction is prone to tilt and variations in drilling position. This can lead to uneven angles and heights when mounting brackets, requiring the time-consuming task of using spacers to adjust the height as needed. Furthermore, if the heights of multiple brackets differ, there is a risk of rattle occurring in the rails and pipes that span between the brackets. To ensure the accuracy of drilling, it is necessary to use construction machinery such as jumbo drills, but because it takes time to align the arms and adjust the inclination, there is a risk that the construction cycle, including drilling the face, will be extended.In addition, these machines occupy a large amount of space inside the mine, which may interfere with the progress of other processes.

[0005] SUMMARY OF THE INVENTION An object of the present invention is to provide a bracket fixing structure that solves the above-mentioned problems of the prior art. [Means for solving the problem]

[0006] The bracket fixing structure of the present invention comprises a fixing member fixed to the tunnel wall, a bracket extending from the tunnel wall toward the inside of the tunnel, an adjustment member connecting the fixing member and the bracket, and a support member that supports the bracket by applying a reaction force to the tunnel wall below the bracket, wherein the adjustment member comprises a first member, a second member, a plurality of adjustment bolts, and a plurality of nuts, wherein the first member comprises a first plate fixed to the head of the fixing member and a hemisphere provided on the tunnel side surface of the first plate, and the second member comprises a second plate fixed to the base end of the bracket and a plurality of second communicating holes that connect the second plate, wherein the tips of the adjustment bolts protrude from the tunnel side surface of the first plate and the tunnel wall side surface of the second plate abuts against the hemisphere, and the plurality of adjustment bolts are connected to the plurality of second communicating holes and nuts are screwed onto the tips of the adjustment bolts, thereby fixing the bracket to the tunnel wall in such a way that the angle can be adjusted vertically and horizontally.

[0007] In the bracket fixing structure of the present invention, the second member may have an adjustment groove provided on the surface of the second plate facing the hole wall, and the hemisphere may be abutted within the adjustment groove.

[0008] The bracket fixing structure of the present invention may be configured such that the bracket has a connecting end extending from the base end toward the tunnel wall and a connecting hole connecting the connecting end horizontally, the second member has a height adjustment plate extending from the tunnel inner surface of the second plate and an adjustment hole connecting the height adjustment plate horizontally, the bracket is fixed to the second member by passing a bolt through the connecting hole and the adjustment hole and screwing a nut into it, and at least one of the connecting holes and the adjustment hole may be arranged in parallel in the vertical direction, and the height of the bracket relative to the fixing member may be changed by selecting the connecting hole or adjustment hole through which the bolt passes.

[0009] In the bracket fixing structure of the present invention, the first member may have a plurality of first communication holes communicating with the first plate, and a plurality of adjustment bolts may be communicated with the plurality of first communication holes.

[0010] The bracket fixing structure of the present invention may be such that the adjustment member comprises a plurality of tapered washers, which are annularly attached to the adjustment bolt and interposed between the first plate and the head of the adjustment bolt, and / or between the second plate and the nut, and the tapered surfaces of the tapered washers are abutted against the outer edge of the first communicating hole and / or the outer edge of the second communicating hole. [Effects of the Invention]

[0011] The bracket fixing structure of the present invention is a structure that allows the angle of the bracket relative to the hole wall to be adjusted vertically and horizontally via an adjustment member, so even if there is a tilt in the drilling direction or a deviation in the drilling position, the bracket angle can be adjusted via the adjustment member. This eliminates the need to adjust the height using spacers or the like as in the prior art, and also prevents rattling of the construction equipment due to differences in bracket height. Furthermore, because drilling does not require the high precision required by conventional techniques, the work can be done manually using hammer drills, etc., without relying on construction machinery. This not only shortens the construction cycle, but also makes effective use of the limited underground space, improving construction efficiency. [Brief explanation of the drawings]

[0012] [Figure 1] Bracket fixing structure diagram [Figure 2] Construction equipment diagram [Figure 3] Illustration of fixing parts and brackets [Figure 4] Diagram of adjustment parts (1) [Figure 5] Diagram of adjustment parts (2) [Figure 6] Height adjustment function diagram [Figure 7] Angle adjustment function diagram [Figure 8] Explanatory diagram of Example 2 DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, the bracket fixing structure of the present invention will be described in detail with reference to the drawings. [Example]

[0014] [Bracket fixing structure] <1> Overall configuration (Figure 1) The bracket fixing structure 1 (hereinafter referred to as "fixing structure 1") is a structure for fixing a bracket 20 that supports construction equipment B and the like to a tunnel wall A. In this example, a case will be described in which the bracket 20 is fixed to a shotcrete surface at a mountain tunnel construction site. However, the hole wall A is not limited to a shotcrete surface, and may be, for example, a lining concrete surface. It may also be the hole wall A of a tunnel that is in service. The fixing structure 1 comprises at least a fixing member 10 fixed to the tunnel wall A, a bracket 20 extending from the tunnel wall A toward the inside of the tunnel, an adjustment member 30 connecting the fixing member 10 and the bracket 20 so that the angle can be adjusted, and a support member 40 supporting the bracket 20 from below. One feature of the fixing structure 1 is that the bracket 20 is fixed to the hole wall A in such a way that the angle can be adjusted in the vertical and horizontal directions by the structure of the adjustment member 30.

[0015] <1.1> Construction equipment (Fig. 2) Construction equipment B is construction equipment installed on the tunnel wall A. In this example, construction equipment B is a rail for moving a tunnel face containment balloon cart. The tunnel face containment balloon cart is a work cart that uses inflated balloons to form a partition wall in the tunnel during blasting excavation at the tunnel face in mountain construction work, blocking flying stones and dust caused by blasting. However, construction equipment B is not limited to moving rails for face containment balloon trolleys, but also includes belt conveyors, surveying equipment such as total stations, photographing devices such as face monitoring cameras, piping, communication equipment such as wireless access points, lighting equipment, warning lights, and any other equipment that can be supported by bracket 20 for use during tunnel construction or while the tunnel is in service.

[0016] <2> Fixing member (Fig. 3) The fixing member 10 is a member to be inserted into the tunnel wall A and fixed thereto. In this example, the fixing member 10 is a combination of a rock bolt 11 inserted into a long hole A1 provided in the hole wall A and grout material 12 filled around the rock bolt 11 in the long hole A1. The fixed end 11a of the head of the rock bolt 11 protrudes into the hole. However, the fixing member 10 is not limited to the combination of the rock bolt 11 and the grout material 12, but may be any member that can be fixed to the hole wall A, such as an anchor bolt or a chemical anchor (registered trademark).

[0017] <3> Bracket (Figure 3) The bracket 20 is a member that supports the construction equipment B. In this example, the bracket 20 is a combination of a bracket main body 21, a connecting end 22 provided at the base end of the bracket main body 21, an inclined base 23 provided on the underside of the bracket main body 21, and a guide roller 24 installed on the upper surface of the bracket main body 21. The bracket body 21 is a main body member of the bracket 20. The bracket body 21 can be made of an H-shaped steel with flange surfaces arranged in the vertical direction. The connecting end 22 is a member for connecting to the adjustment member 30. The connecting end 22 can be made of a steel plate extending in the height direction and extending from the end of the bracket body 21 on the hole wall A side. The connecting end 22 is provided with a connecting hole 22a that communicates with both faces. The inclined base 23 is a base that supports the bracket body 21 by the support member 40. The inclined base 23 extends downward from the lower surface of the bracket body 21, and the lower surface is inclined toward the hole wall A side. The guide rollers 24 are rollers for mounting a moving rail, which is the construction equipment B. The guide rollers 24 are axially supported on the upper surface of the bracket body 21 in the longitudinal direction of the bracket body 21. However, the configuration of the bracket 20 is not limited to the above, and for example, the bracket body 21 may be an angle bar, a channel bar, a square steel pipe, a circular steel pipe, etc. Also, the connecting end 22 does not have to have the connecting hole 22a. If the construction equipment B is not a rail, the guide roller 24 does not have to be provided.

[0018] <4> Adjustment member (Fig. 4, 5) The adjustment member 30 is a member that connects the fixing member 10 and the bracket 20 . The adjustment member 30 includes at least a first member 31, a second member 32, a plurality of adjustment bolts 33, and a plurality of nuts 34. In this example, the adjustment member 30 further includes a plurality of tapered washers 35.

[0019] <4.1> First member (Figs. 4 and 5) The first member 31 is a member that connects the fixed member 10 and the second member 32 together. The first member 31 includes at least a first plate 31a, and in this example, further includes a plurality of first communication holes 31b, a connecting portion 31c, and a hemisphere 31d. In detail, for example, a rectangular steel plate is used as the first plate 31a, and first communicating holes 31b having a diameter larger than the outer diameter of the adjustment bolts 33 are provided at the four corners of the first plate 31a. A connecting portion 31c for screwing the fixed end 11a of the fixing member 10 is provided at the center of the surface of the first plate 31a facing the hole wall A, and a hemisphere 31d is provided at the center of the surface of the first plate 31a facing inside the hole. The semi-sphere 31d is a member that supports the surface of the second plate 32a (described later) on the side of the hole wall A so as to be able to adjust the angle. In this example, a cap nut welded to the first plate 31a is used as the semi-sphere 31d.

[0020] <4.2> Second member (Fig. 4, 5) The second member 32 is a member that connects the bracket 20 and the first member 31 together. The second member 32 includes at least a second plate 32a and a plurality of second communication holes 32b, and in this example, further includes an adjustment groove 32c and a height adjustment plate 32d. In detail, for example, a rectangular steel plate is used as the second plate 32a, and second communication holes 32b having a diameter larger than the outer diameter of the adjustment bolt 33 are provided at positions corresponding to the first communication holes 31b at the four corners of the second plate 32a. An adjustment groove 32c is provided in the center of the surface of the second plate 32a facing the hole wall A. In this example, the adjustment groove 32c is a vertically elongated hole that communicates with both sides of the second plate 32a. However, the structure of the adjustment groove 32c is not limited to the above, and it may be horizontally elongated, cross-shaped, elliptical, or the like. It may also be a recessed shape that does not penetrate the second plate 32a.

[0021] <4.2.1> Height adjustment plate (Fig. 6) The height adjusting plate 32d is a member for adjusting the height of the bracket 20 relative to the wall A of the hole. In this example, the height adjustment plate 32d has a plurality of adjustment holes 32e that communicate with both surfaces of the height adjustment plate 32d. The adjustment holes 32e are arranged in parallel at predetermined intervals in the height direction of the height adjustment plate 32d. The bracket 20 is fixed to the second member 32 by passing a bolt through the connecting hole 22a of the connecting end 22 of the bracket 20 and the adjustment hole 32e of the height adjustment plate 32d and fastening it. At this time, by selecting the position of the adjustment hole 32e through which the bolt passes, the connecting position between the bracket 20 and the fixing member 10 can be changed, and the height of the bracket 20 relative to the hole wall A can be adjusted. For example, by connecting and fastening a bolt between the lowest adjustment hole 32e of the multiple adjustment holes 32e and the connecting hole 22a of the bracket 20, the bracket 20 can be fixed at the lowest position relative to the hole wall A (Fig. 6(a)). On the other hand, by connecting and fastening a bolt between the highest adjustment hole 32e of the multiple adjustment holes 32e and the connecting hole 22a of the bracket 20, the bracket 20 can be fixed at the highest position relative to the hole wall A (Fig. 6(b)). However, the connection structure between the bracket 20 and the fixing member 10 is not limited to the above, and may be configured, for example, such that multiple connection holes 22a are arranged in parallel in the height direction of the connecting end 22, and the height of the bracket 20 is adjusted by the position of the connection holes 22a through which the bolts are passed.

[0022] <4.3> Tapered washer (Fig. 4, 5) The tapered washer 35 is a member that makes it easy to adjust the angle of the adjustment bolt 33. The tapered washer 35 has an outwardly tapered surface on one side. When the first member 31 and the second member 32 are bolted together, the tapered surfaces of the tapered washer 35 are brought into contact with the outer edges of the first communicating hole 31b and the second communicating hole 32b, so that even if the axis of the adjustment bolt 33 is inclined relative to the surfaces of the first plate 31a and the second plate 32a, the tapered washer 35 follows the inclination and automatically corrects the angle. This prevents gaps from being generated between the surfaces of the first plate 31a and the second plate 32a and the tapered washer 35 due to the inclination, and by ensuring sufficient axial tension on the adjustment bolt 33, it is possible to prevent the nut 34 from loosening. However, the tapered washer 35 is not an essential component of the present invention, and for example, a normal washer may be used instead of the tapered washer 35.

[0023] <4.4> Connection of the first and second members (Figs. 4 and 5) The first member 31 and the second member 32 are connected in the following procedure. The second plate 32a is placed on the inside of the tunnel of the first plate 31a, and the hemisphere 31d of the first member 31 is brought into contact with the groove of the adjustment groove 32c of the second member 32. A tapered washer 35 is annularly fitted around the adjustment bolt 33, the adjustment bolt 33 is connected to the first communicating hole 31b and the second communicating hole 32b, the tapered washer 35 is annularly fitted around the head of the adjustment bolt 33, and the adjustment bolt 33 is fastened by screwing on a nut 34. At this time, the tapered washer 35 is arranged with its tapered surface facing inward (i.e., toward the first plate 31a and second plate 32a). In this way, the first member 31 is connected to the second member 32 with the surface of the second plate 32a on the side of the well wall A pressed against the top of the semi-sphere 31d. In this example, the second plate 32a is provided with the adjustment groove 32c, and therefore the contact points between the hemisphere 31d and the second plate 32a are two points on the edge of the adjustment groove 32c, thereby increasing the stability of the connection.

[0024] <5> Support member (Figure 1) The support member 40 is a member that supports the bracket 20 from below. In this example, the support member 40 includes a jack base 41 for an inclined surface fixed to the underside of the inclined pedestal 23 of the bracket 20 . The jack base 41 is bridged in a diagonal brace manner between the underside of the inclined base 23 and the hole wall A below the bracket 20. However, the support member 40 is not limited to the jack base 41, but may be a pipe support, etc. In short, it is sufficient if it is a member that can receive a reaction force from the hole wall A and support the bracket 20 from below.

[0025] <6> Installation of fixed structures The fixing structure 1 is installed in the following manner. A long hole A1 having a depth corresponding to the length of the rock bolt 11 is drilled at a predetermined position on the pit wall A. The fixing structure 1 of the present invention allows the angle of the bracket 20 to be adjusted vertically and horizontally after drilling the long hole A1, so the drilling work does not require a high degree of perpendicularity to the hole wall A as in the prior art. Therefore, workers can easily drill the hole using a hammer drill or the like, without using construction machinery such as a drill jumbo. Grout material 12 is filled into the long hole A1, and the rock bolt 11 is inserted. An adjustment member 30 is attached to the fixed end 11a of the rock bolt 11. More specifically, the connecting portion 31c of the first member 31 is screwed and fixed to the fixed end 11a of the rock bolt 11. After the grout material 12 has hardened, the bracket 20 is attached to the second member 32 of the adjustment member 30. In detail, the height adjustment plate 32d of the second member 32 is brought into contact with the side surface of the connecting end 22 of the bracket 20, and a bolt is passed through the connecting hole 22a of the connecting end 22 and the adjustment hole 32e of the height adjustment plate 32d, and a nut is screwed and fastened to fix the bracket 20 to the second member 32. The jack base 41 of the support member 40 fixed to the lower part of the bracket 20 is adjusted to brace against the hole wall A below the bracket 20, and a reaction force is applied to the hole wall A to support the bracket 20 from below.

[0026] <7> Angle adjustment function (Figure 7) In the fixing structure 1 of the present invention, when the first member 31 and the second member 32 of the adjustment member 30 are combined, the surface of the second plate 32a facing the hole wall A abuts the top of the hemisphere 31d, so that the second plate 32a can be tilted in all directions centered on the top of the hemisphere 31d, including the vertical direction (Figure 7(a)) and the horizontal direction (Figure 7(b)). Therefore, the second plate 32a can be positioned at any angle relative to the first plate 31a, and the adjustment bolt 33 and nut 34 can be tightened to support the second plate 32a against the hemisphere 31d, thereby fixing the inclination angle of the second member 32 relative to the first member 31. Furthermore, by using a jack base 41 arranged in a diagonal brace shape below the bracket 20 to support the bracket 20 from below, it is possible to prevent the bracket 20 from tilting due to the load or vibration of the construction equipment B, and ensure a stable support state. [Example]

[0027] [Example without first communication hole] (Figure 8) In the first embodiment, the first member 31 has the first communication hole 31b and the adjustment bolt 33 is inserted into the first communication hole 31b, but the first communication hole 31b is not an essential component. In this example, the adjustment bolt 33 is integral with the first plate 31a, and the tip of the adjustment bolt 33 protrudes from the surface of the first plate 31a facing the inside of the tunnel. In detail, for example, the threaded portion of the adjustment bolt 33 can be welded to the surface of the first plate 31a facing the inside of the tunnel. In this example, there is no need to insert the adjustment bolt 33 into the first communicating hole 31b, and the adjustment bolt 33 can be prevented from falling out of the first communicating hole 31b when the first member 31 and the second member 32 are connected. [Explanation of symbols]

[0028] 1 Bracket fixing structure 10 Fixing member 11 Rock Bolt 11a fixed end 12 Grout material 20 Bracket 21 Bracket body 22 Connecting end 22a Connection hole 23 Inclined pedestal 24 Guide roller 30 Adjustment member 31 First member 31a Plate 1 31b 1st communication hole 31c connection part 31d hemisphere 32 Second member 32a Second Plate 32b 2nd communication hole 32c adjustment groove 32d Height adjustment plate 32e adjustment hole 33 Adjustment bolt 34 Nut 35 Tapered washer 40 Support member 41 Jack base A Pit wall A1 long hole B. Construction Equipment

Claims

1. a fixing member fixed to the tunnel wall; A bracket extending from the well wall toward the inside of the well; an adjustment member that connects the fixing member and the bracket; a support member that receives a reaction force from the hole wall below the bracket and supports the bracket, the adjustment member includes a first member, a second member, a plurality of adjustment bolts, and a plurality of nuts; The first member comprises a first plate fixed to the head of the fixing member and a hemisphere provided on the surface of the first plate facing the borehole, the second member includes a second plate fixed to a base end of the bracket and a plurality of second communication holes communicating with the second plate; The tip of the adjustment bolt protrudes from the surface of the first plate facing the inside of the tunnel, The hole wall side surface of the second plate is abutted against the hemisphere, the plurality of adjustment bolts are connected to the plurality of second communication holes, and the nuts are screwed onto the tips of the adjustment bolts, thereby fixing the bracket to the hole wall in an angle adjustable manner in the vertical and horizontal directions. Bracket fixing structure.

2. The second member has an adjustment groove provided on the surface of the second plate facing the well wall, The hemisphere is abutted within the adjustment groove. The bracket fixing structure according to claim 1 .

3. The bracket has a connecting end extending from the base end toward the well wall side and a connecting hole that connects the connecting end in the horizontal direction, The second member includes a height adjustment plate extending from the surface of the second plate facing the inside of the tunnel, and an adjustment hole that horizontally connects the height adjustment plate, a bolt is passed through the connecting hole and the adjusting hole, and a nut is screwed onto the bolt to fix the bracket to the second member; At least one of the connecting hole and the adjusting hole is arranged in parallel in the height direction, The height of the bracket relative to the fixing member can be changed by selecting the connecting hole or the adjusting hole through which the bolt communicates. The bracket fixing structure according to claim 1 .

4. the first member has a plurality of first communication holes that communicate with the first plate; The plurality of adjustment bolts are connected to the plurality of first communication holes. The bracket fixing structure according to claim 1 .

5. the adjustment member comprises a plurality of tapered washers; The plurality of tapered washers are annularly attached to the adjustment bolt and are interposed between the first plate and the head of the adjustment bolt and / or between the second plate and the nut; a tapered surface of the tapered washer being in contact with an outer edge of the first communicating hole and / or an outer edge of the second communicating hole; The bracket fixing structure according to claim 4.

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