JPH10169393A - Friction bolt and fixing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily, rapidly, costlessly, and securely stabilize the ground. SOLUTION: A friction bolt 2 is constituted of a pipe body 4, a male screw member 6 inserted in the inside of the pipe body 4, and a nut 8. A plurality of cuts 16 extending in the longitudinal direction of the pipe body 4 are formed at every peripheral distance of the pipe body and at every longitudinal distance of the pipe body. A plurality of narrow pieces 18 extending in the longitudinal direction of the pipe body are formed between the cuts 16. The pieces are deformed to the radial outward direction of the pipe body by a compressive force. The male screw member 6 is formed to have the outer diameter which can be inserted in the pipe body and a larger length than the pipe body. The front end of the male screw member 6 is welded to the front end of the pipe body. The nut 8 can be fitted on the screw 602 of the male screw member 6 and provided with the outline which can be fitted to contact the end face 402 of the base end of the pipe body 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a friction bolt used for preventing the collapse of ground and stabilizing the ground in tunnel work and slope excavation work, and a method of fixing the friction bolt.

[0002]

2. Description of the Related Art For example, in order to prevent collapse of a tunnel wall surface in tunnel construction, a large number of holes are drilled in a tunnel wall surface, and a lock bolt or a friction bolt is driven into each hole. Conventionally, as this type of lock bolt, a hole is drilled in the tunnel wall, mortar is filled in the hole, and the lock bolt is inserted. And a method of stabilizing the ground is used. Swellex bolts, split setter bolts, and the like are used as friction bolts. Swellex bolts are of the type in which water pressure is applied to the inside of the bolt, radially outwardly expanded and pressed against the wall of the tunnel, and split setter bolts are elastically deformable tubular bolts with cuts Is pressed into the hole while reducing the diameter, and the surface of the bolt that returns elastically is pressed against the wall surface of the tunnel.

[0003]

However, in the friction bolt of the type in which the mortar is filled, a curing period until the mortar hardens is required about 1 to 3 days, so that it takes a long time until the reinforcing effect is exhibited. Cost,
Mortar spills out at the spring area, making construction impossible. Swellex bolts are expensive and splitter bolts have a weak reinforcing effect, and these friction bolts are rarely used in practice. The present invention has been devised in view of the above circumstances, the object of the present invention,
An object of the present invention is to provide a friction bolt and a method for fixing the friction bolt, which can easily and quickly perform the operation, stably secure the ground at low cost.

[0004]

In order to achieve the above object, a method for fixing a friction bolt according to the present invention has an outer diameter inserted into a drilled hole and a length corresponding to the hole. A pipe body is provided, and at a plurality of locations spaced apart in the longitudinal direction of the pipe body, a diameter-enlarging portion that is deformed by a compressive force acting in the longitudinal direction of the pipe body and expands radially outward of the pipe body is provided. Inserting the tubular body into the excavated hole, applying a compressive force to the tubular body in the longitudinal direction to expand the enlarged diameter portion, and pressing the tubular body against the wall of the hole. Features. Further, in the present invention, the enlarged diameter portion extends in the longitudinal direction of the tubular body with a narrow width formed between a plurality of cuts extending in the longitudinal direction of the tubular body at intervals in the circumferential direction of the tubular body. It is characterized by being constituted by a plurality of existing pieces. Further, the friction bolt of the present invention has an outer diameter to be inserted into an excavated hole, and is formed with a length corresponding to the hole, and is inserted through the inside of the tube, and a tip thereof is the pipe. A male screw member that is immovably connected to the body in the longitudinal direction thereof and whose base end protrudes outward in the longitudinal direction from the base end of the tubular body, and at a plurality of locations spaced apart in the longitudinal direction of the tubular body, Formed between a plurality of cuts extending in the longitudinal direction of the tube at intervals in the circumferential direction of the tube, and deformed radially outward of the tube by applying a compressive force in the longitudinal direction of the tube A plurality of pieces having a narrow width and extending in the longitudinal direction of the tubular body; a male thread formed at a location where the male screw member projects from a base end of the tubular body; and the tubular body capable of being screwed to the male thread. And a nut member that can be brought into contact with the end face of the base end. Further, the present invention is characterized in that the male screw member is formed of a tubular member.

[0005] According to the friction bolt fixing method of the present invention, when a compressive force is applied to the pipe body, the diameter-expanded portions are expanded at a plurality of locations spaced apart in the longitudinal direction of the pipe body, and the excavated hole is formed. And the friction bolt is fixed to the hole. Further, in the friction bolt of the present invention, when the nut member is tightened, a plurality of pieces are deformed radially outward of the pipe at a plurality of locations spaced apart in the longitudinal direction of the pipe, and are excavated. The friction bolt is fixed to the hole by pressing against the hole wall of the hole.

[0006]

Next, an embodiment of the present invention will be described. First, the friction bolt of the present invention will be described, and then the method of fixing the friction bolt of the present invention will be described together with the method of using the same. 1A is a side view of the friction bolt, FIG. 1B is an enlarged side view of the enlarged diameter portion, FIG. 1C is a side view of the enlarged diameter portion in an enlarged state, and FIG.
(A) to (D) are explanatory diagrams of a method of using a friction bolt, and FIG. 3 is an explanatory diagram at the time of construction of a ground stabilization operation using the friction bolt. The friction bolt 2
A tube 4, a male screw member 6 inserted into the tube 4,
And a nut member 8.

[0007] The tube 4 is a commercially available tube having both ends opened and having a uniform diameter. The outer diameter of the tube 4 is as shown in FIG.
As shown in (B), the outer diameter inserted into the hole 14 excavated in the ground 12, and the length of the pipe 4 corresponds to the depth of the hole 14 excavated in the ground 12. It is formed in length. As shown in FIG. 1B, a plurality of cuts extending in the longitudinal direction of the tube 4 are provided at a plurality of locations spaced in the longitudinal direction of the tube 4 at intervals in the circumferential direction of the tube 4. 16 are formed, and a plurality of strips 18 each having a small width and extending in the longitudinal direction of the tube body 4 are formed between the cuts 16 at the respective locations. As shown in FIG. 1 (C), the plurality of pieces 18 are deformed radially outward of the tube 4 by a compressive force acting in the longitudinal direction of the tube 4, and are deformed outside the tube 4. The plurality of pieces 18 constitute an enlarged-diameter portion 20. The deformation of the above-mentioned piece 18 may be plastic deformation or elastic deformation. Further, as described above, the pipe 4
In order to easily deform radially outward of the pipe 4 when a compressive force acts in the longitudinal direction of the pipe, a pipe made of mild steel used for a gas pipe, a water pipe, or the like is used.

The male screw member 6 has an outer diameter slightly smaller than the inner diameter of the tube 4 and an outer diameter inserted into the tube 4 and has a length larger than that of the tube 4. As the male screw member 6, a commercially available tube having a uniform diameter is used. The distal end of the male screw member 6 is welded to the distal end of the tube 4, so that the male screw member 6 is connected to the tube 4 so that it cannot rotate and cannot move in the axial direction. A male screw 602 is formed at a base end portion where the male screw member 6 protrudes from an end of the tube 4.

The nut member 8 has a contour that can be screwed into the male screw 602 and can abut on the end face 402 at the base end of the tube 4. Therefore, the nut member 8
Is rotated, the end surface of the nut member 8 comes into contact with the end surface 402 of the base end of the tube 4. Further, when the nut member 8 is rotated, a pulling force acts on the male screw member 6 and a compressive force acts on the tube body 4 in its longitudinal direction. At this time, the outer peripheral surface of the male screw member 6 is formed to have a size close to the inner peripheral surface of the tube body 4 so that the piece 18 is easily deformed radially outward. The male screw member 6 is formed with such strength that it can be deformed so as to be deformed.

Next, a method of stabilizing the ground 12 using the above-described friction bolt 2 will be described. First, as shown in FIG. 2A and FIG.
A hole (bore hole) 14 having a predetermined length
Drill using Next, as shown in FIGS. 2B and 3, the worker puts on the loading platform 28 of the aerial work vehicle 26 and inserts the friction bolt 2 into the hole 14 manually or by using the drifter 24. . Next, as shown in FIG. 2C, the nut member 8 is tightened using a tool 30 such as a torque wrench.

By tightening the nut member 8, FIG.
(C), as shown in FIG. 2 (D), the piece 18 is curved and deformed outward in each enlarged diameter portion 20 to have an outer diameter larger than that of the tube 4. Each piece 18 hits the hole wall of the hole 14 and is deformed into a shape corresponding to the unevenness of the hole wall, and each piece 18 is adhered to the hole wall, thereby fixing the tube 4 to the hole 14. finish. Next, a tool 3 such as a torque wrench
0 is removed, the washer 32 is attached to the base end of the male screw member 6, and the nut 34 is tightened to remove the washer 32 from the ground 12
And finish the work.

As described above, according to this embodiment, the friction bolt 2 is fixed to the ground 12, and the pressing force against the ground 12 is applied to the hole wall of the hole 14 by the deformation of the piece 18. By this pressing force, the effect of restraining the movement of the ground 12 is reliably provided, and the ground 12 can be reinforced in a stable state. In addition, the workability is very easy to insert, and the simple operation of tightening the nut member 8 allows the friction bolt 2 to be fixed to the ground 12 in a short time, so that the efficiency of the work is significantly improved. Becomes possible. In addition, a commercially available inexpensive steel pipe is used as the pipe body 4 and the male screw member 6, the unit price per friction bolt becomes very low, and furthermore, construction is possible even at a spring location. .

In the embodiment, the case where the enlarged diameter portion 20 is constituted by a plurality of pieces 18 has been described. However, the enlarged diameter portion 20 is constituted by forming the wall thickness to be thinner than the other tube 4 portions. The configuration of the enlarged diameter portion 20 is arbitrary.

[0014]

As is clear from the above description, the friction bolt fixing method according to the present invention provides a pipe body having an outer diameter to be inserted into a drilled hole and a length corresponding to the hole. Provided at a plurality of locations spaced apart in the longitudinal direction of the tubular body, provided with a diameter-enlarging portion that is deformed by a compressive force acting in the longitudinal direction of the tubular body and expands radially outward of the tubular body, A tube was inserted into the excavated hole, and a compressive force was applied to the tube in a longitudinal direction of the tube to expand the enlarged-diameter portion so that the tube was pressed against the wall of the hole. Further, the friction bolt of the present invention has an outer diameter to be inserted into an excavated hole, and is formed with a length corresponding to the hole, and is inserted through the inside of the tube, and a tip thereof is the pipe. A male screw member that is immovably connected to the body in the longitudinal direction thereof and whose base end protrudes outward in the longitudinal direction from the base end of the tubular body, and that is spaced in the circumferential direction of the tubular body and extends in the longitudinal direction of the tubular body. A plurality of narrow width extending in the longitudinal direction of the tubular body are formed between the plurality of extending cuts, and are deformed outward in the radial direction of the tubular body when a compressive force acts in the longitudinal direction of the tubular body. A piece, a male screw formed at a position where the male screw member protrudes from the base end of the tube, and a nut member that can be screwed to the male screw and abut on an end face of the base end of the tube. The configuration was adopted. Therefore, the work can be easily and quickly performed, and the ground can be reliably stabilized at low cost.

[Brief description of the drawings]

FIG. 1A is a side view of a friction bolt, and FIG.
FIG. 3 is an enlarged side view of the enlarged diameter portion, and FIG. 2C is a side view of a state where the enlarged diameter portion is enlarged.

FIGS. 2A to 2D are explanatory diagrams of a method of using a friction bolt.

FIG. 3 is an explanatory view at the time of construction of a ground stabilization operation using a friction bolt.

[Explanation of symbols]

 Reference Signs List 2 friction bolt 4 tube 6 male screw member 8 nut member 12 ground 14 hole 16 cut 18 piece 20 enlarged diameter portion

Claims (4)

[Claims] 1. A method of fixing a friction bolt inserted into a hole excavated in a ground and integrated with the ground, the outer diameter being inserted into the excavated hole and corresponding to the hole. A tubular body having a length that is set to a predetermined length is formed. The pipe body is inserted into the excavated hole, and a compressive force is applied to the pipe body in a longitudinal direction of the pipe body to expand the diameter-enlarged portion. A method for fixing a friction bolt, wherein the friction bolt is pressed. 2. The enlarged diameter portion extends in the longitudinal direction of the tubular body with a narrow width formed between a plurality of cuts extending in the longitudinal direction of the tubular body at intervals in the circumferential direction of the tubular body. The method for fixing a friction bolt according to claim 1, wherein the friction bolt is constituted by a plurality of pieces. 3. A friction bolt inserted into a hole excavated in the ground and integrated with the ground, wherein the friction bolt has an outer diameter inserted into the excavated hole and a length corresponding to the hole. A tubular body is formed, and is inserted into the inside of the tubular body, a distal end is immovably connected to the tubular body in a longitudinal direction thereof, and a proximal end is located outside the proximal end of the tubular body in the longitudinal direction. A male screw member protruding, formed at a plurality of locations spaced in the longitudinal direction of the tubular body, between a plurality of cuts extending in the longitudinal direction of the tubular body at intervals in the circumferential direction of the tubular body, A plurality of strips extending in the longitudinal direction of the tubular body with a narrow width deformed radially outward of the tubular body by a compressive force acting in the longitudinal direction of the body, and the male screw member being a proximal end of the tubular body A male screw formed at a position protruding from the male screw; Friction bolt, characterized in that it comprises a contact capable nut member. 4. The friction bolt according to claim 3, wherein said male screw member is formed of a tubular member.