JP2002054400A - Temporary lock bolt and lock bolt execution method making use thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a temporary lock bolt capable of releasing the fixing, if necessary, after a piece to be fixed is temporarily fixed to the ground with excellent strength and a lock bolt execution method making use the temporary lock bolt. SOLUTION: A steel pipe front end 331 is expanded to the direction of a diameter from the attachment 312 of a bolt body 31 inserted into a steel pipe 33 to release a contact state between the steel pipe front end 331 and the excavated hole interior wall surface 41 by moving the bolt body 31 to the front end side of the steel pipe 33 from a state coming into contact with the excavated hole interior wall surface 41, and the steel pipe 33 and the bolt body 31 can be pulled out from an excavated hole 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temporary lock bolt for fixing an object to be fixed, such as rock, concrete, or the surface of a ground, to the ground, and a method of constructing a lock bolt using the temporary lock bolt.

[0002]

2. Description of the Related Art Grout-type lock bolts have been frequently used to fix an object such as rock to the ground. For example, to reinforce the ground, after drilling holes in the ground using a drilling machine, insert a lock bolt into the drilling holes, inject a cement such as cement milk or mortar, and lock with the cement. The bolt and the ground are in close contact. Finally, an anchor plate is attached to the tip of the lock bolt, and the ground surface is tightened by the anchor plate to prevent the ground surface from sliding down.

[0003]

The above-mentioned conventional lock bolts are semi-permanently fixed to the ground. In recent years, however, recently, the ground has been temporarily reinforced or rock or concrete has been temporarily grounded. There is a demand that the lock bolts be removed from the ground or the like when necessary. That is, temporary type lock bolts have recently been highlighted.

However, to date, there has been no temporary lock bolt capable of temporarily fixing an object to be fixed such as rock, concrete, or the ground surface with excellent strength to the ground. It is desired to provide a temporary lock bolt and a method of constructing a lock bolt using the temporary lock bolt.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and a temporary lock bolt capable of temporarily fixing an object to the ground with excellent strength and then releasing the fixation as required. An object of the present invention is to provide a lock bolt construction method using a temporary lock bolt.

[0006]

SUMMARY OF THE INVENTION In a temporary lock bolt according to the present invention, an outer diameter of a tip portion increases in a drilled hole penetrating an object to be fixed and extending into the ground as the drilling direction is increased. The rod-shaped member is inserted, and a steel pipe whose distal end is expandable and retractable can be inserted into the rod-shaped member. Then, when the rod-shaped member and the steel pipe are inserted into the drilled hole and the rod-shaped member relatively moves to the rear end side of the steel pipe, the distal end of the steel pipe is expanded in the radial direction to be in close contact with the inner wall surface of the drilled hole. For this reason, the fixed object can be fixed to the ground with excellent strength.

On the other hand, when the rod-shaped member relatively moves toward the tip of the steel pipe from the fixed state, the close contact between the tip of the steel pipe and the inner wall surface of the hole is released, and the rod-shaped member and the steel pipe can be extracted from the hole. Become. Therefore, the object to be fixed can be removed from the ground after the rod-shaped member is relatively moved to the distal end side of the steel pipe as necessary, and the temporarily required time for fixing the object to the ground by the lock bolt, which has been conventionally required, can be improved. Fixation becomes possible.

Here, the temporary lock bolt can temporarily fix the ground surface portion as an object to be fixed, for example, in order to prevent the ground surface portion from slipping off the ground, and can also partially fix the ground surface portion from the ground. Alternatively, the entire exposed rock can be temporarily fixed to the ground, or concrete formed on the surface side of the ground can be temporarily fixed to the ground, and temporarily fixed to the ground. It can be used for all things.

In addition, since the temporary lock bolt can be pulled out from the hole, for example, after temporarily fixing the object to be fixed and then pulling out the hole from the hole, it is necessary to fix another object to be fixed. Can be repeatedly used, and the construction cost for temporarily fixing the fixed object to the ground can be reduced.

Here, the rod-shaped member may be an integrally formed one, but may also be constituted by attaching an attachment portion to the tip of a steel rod. In this case, the rod-shaped member is integrally formed. As compared with the case of forming the rod-shaped member, the production is easier and the cost of the rod-shaped member can be reduced. In addition, it is possible to prepare attachment parts having different shapes from each other, select an attachment part suitable for work at a work site, and attach it to the tip of a steel rod to complete the rod-shaped member. In other words, while the steel bars that constitute the bar-shaped member are shared, only the attachment portion is selected, so that it is possible to accurately respond to the work site and improve workability.

Further, the rod-shaped member may be constituted as follows. That is, a steel rod having a male screw formed at the tip is screwed into the through hole of the attachment part, and a fastening member is screwed into the tip of the steel rod protruding from the tip of the attachment part to tighten the attachment part. Thus, a bar-shaped member is formed. By doing so, the steel rod is screwed into the attachment portion, and the distal end of the attachment portion is fastened by the fastening member, so that the bonding strength between the steel rod and the attachment portion can be increased.
As a result, the steel bar can be pulled up with a large force, and the bar-shaped member can be firmly fixed to the rock.

By the way, if the attachment portion is formed long in the drilling direction, the contact area between the attachment portion and the tip of the steel pipe is increased, and the tip of the steel pipe can be brought into close contact with the inner wall surface of the drill hole with a larger area. The pull-out strength of the lock bolt can be improved. However, if the male screw formed on the steel bar has a special shape, for example, it may be difficult to form a female screw over the entire through hole of the long attachment portion. In such a case, the attachment portion is divided into a plurality of divided portions in the drilling direction, female screws are formed in each of the divided portions having a short length, and each divided portion is formed of a steel rod having a small outer diameter. , Which are screwed into each other so as to be in close contact with each other, thereby forming an attachment portion having a flared skirt. In this way, even if the long attachment portion is divided in the drilling direction, a female screw can be formed in the entire through hole, and the bonding strength between the steel rod and the attachment portion can be improved. .

Further, according to the rock bolt construction method of the present invention, a rod-like member having a flared tip and a steel pipe inserted through the rod-like member are inserted into a drilled hole that penetrates an object and extends into the ground. After that, the bar-shaped member is relatively moved to the rear end side of the steel pipe. As a result, the distal end of the steel pipe is radially expanded by the distal end of the rod-shaped member, and the outer peripheral surface of the distal end of the steel pipe comes into close contact with the inner wall surface of the hole. Subsequently, the object can be firmly fixed to the ground by tightening the object with the plate.

Further, from this state, after the plate is released from tightening as necessary, the rod-shaped member is relatively moved to the tip of the steel pipe, whereby the close contact between the tip of the steel pipe and the inner wall surface of the hole is released. Thus, the bar-shaped member and the steel pipe can be extracted from the hole. Therefore, while the object to be fixed can be fixed to the ground with excellent strength, the bar-shaped member and the steel pipe can be extracted from the drilled hole as needed, so that the object to be fixed can be temporarily fixed to the ground. For example, an object to be fixed to the ground can be removed from the ground by extracting the rod-shaped member and the steel pipe from the hole.

Here, a driving device for moving the rod member relative to the steel pipe in the drilling direction is prepared, and the rod member is cut from the steel pipe by using the driving device in the close contact step and the extraction step. It may be relatively moved in the hole forming direction. In this way, for example, when installing a plurality of temporary lock bolts, one drive device is prepared, and by sharing this drive device, the plurality of temporary lock bolts can be fixed to the drill hole or extracted from the drill hole. Thus, the cost required for installing the temporary lock bolt can be reduced.

[0016]

1 to 7 are views showing a method of removing rock using a temporary lock bolt according to an embodiment of the present invention. In these figures, reference numeral 1 denotes a rock to be removed, and reference numeral 2 denotes a ground on which the rock is present. In the following description, when removing a large rock 1 that is at risk of falling, By implementing the temporary lock bolt 3 (rock bolt construction) on the rock 1 to be formed, the rock 1 is temporarily fixed to the ground 2 to prevent the rock 1 from dropping during the removal operation. Then, while sequentially pulling out the temporary lock bolts 3 from the rock 1, the rock 1
The portion of the rock 1 that is exposed from the ground (hereinafter, referred to as a “removed portion”) is removed.

First, a method of applying the temporary lock bolt 3 when fixing the rock 1 to the ground 2 will be described.

First, as shown in FIG. 1, three drill holes 4 extending through the rock 1 into the ground 2 along the drilling direction X are formed by a drilling machine. As described above, when the rock 1 is large, the rock 1 is securely fixed to the ground 2 by forming a plurality of drill holes 4 and constructing the temporary lock bolts 3 so that the rock 1 is being worked. Prevents falling.
The number of drilled holes is not limited to “3” in the present embodiment, but is arbitrary and may be set appropriately according to the size and weight of the object to be fixed to the ground 2. Good.

Here, the position where the temporary lock bolt 3 is to be constructed, that is, the position where the drill hole 4 is to be formed is determined by the rock 1
In this embodiment, for example, as shown in the figure, the part to be removed of the rock 1 is divided into four regions (R1 to R4), and the second, third and fourth regions ( R
2 to R4), the temporary lock bolt 3 is installed. By doing so, the first region R where the temporary lock bolt 3 is not constructed
The rock 1 can be removed from 1 and the temporary lock bolts 3 are applied to other areas, thereby preventing the rock 1 from dropping during the removal operation.

Next, as shown in FIG. 2A, a bolt body (bar-shaped member) 31 is inserted into the hole 4 in the second region R2. As shown in FIG. 8, the outer diameter of the bolt body 31 increases at the tip end of a threaded steel rod 311 having a thread formed on the whole thereof, from the top in the drilling direction X. Attached portion 312 in the shape of a truncated cone. Here, as the threaded steel rod 311, besides a general PC steel rod, “Total screw PC steel rod / Gevin Destab” / “Small diameter deformed PC steel rod / Sumitwist” manufactured by Sumitomo Electric Industries, Ltd.
And "High-strength deformed steel bar / screw-con" manufactured by Kobe Steel, Ltd. can be used. Also, the attachment unit 31
2, a hole 3121 is formed from the top along an axis of rotational symmetry (not shown), and a female screw which can be screwed to a male screw of the steel rod 311 is formed in the hole 3121. I have. The tip of the steel rod 311 is screwed into a female screw of the attachment part 312 to be integrated.

As shown in the figure, by providing a rectangular recess 3122 in the bottom view of the attachment portion 312 at the bottom of the attachment portion 312, the attachment portion 312 can be screwed by a tool having a shape that can be fitted into the recess 3122. It is desirable to adopt such a configuration from the viewpoint of improving workability, which can be fastened to the steel rod 311. In addition, workability can be improved even during removal. Note that the shape of the concave portion 3122 is not limited to a quadrangle, and may be a polygon. Alternatively, a convex portion may be provided on the attachment portion 312 side, and a concave portion capable of fitting with the convex portion may be provided on the tool side.

Returning to FIG. 2, a method of installing the temporary lock bolt 3 will be described. When the insertion of the bolt body 31 into the drill hole 4 is completed, as shown in FIG. 2B, the anchor plate 32 is attached to the rear end, and the inner diameter of the steel pipe 33 is smaller than the outer diameter of the attachment portion 312.
Through the bolt body 31 and the anchor plate 32
Is brought into contact with the surface of the rock 1.

As shown in FIG. 9, the steel pipe 33 has a tapered tip portion 331 and two slits 332 provided in the longitudinal direction thereof. Can be extended and retracted. That is, in the steel pipe 33, the distal end 331 expands in the radial direction by applying an external force to the distal end 331, while the distal end 331 retreats by removing the external force from the expanded state. An anchor plate 32 having a flange 321 formed on the upper end thereof is detachably screwed to the rear end of the steel pipe 33. With this configuration, for example, when the steel pipe 33 is consumed due to friction with the bolt body 31 or the like, only the steel pipe 33 can be replaced.

When the insertion of the steel pipe 33 into the hole 4 is completed,
As shown in FIG. 2B, the nut 34 is screwed from the rear end side of the bolt body 31. Subsequently, the support member 5 is attached to the anchor plate 32 as shown in FIG.
The support member 5 is formed in a cylindrical shape, and has a protrusion 51 formed on the inner wall thereof, which is in contact with the upper surface of the anchor plate 32. In addition, an opening (not shown) is formed in the side surface of the support member 5, and for example, the nut 34 can be tightened from the outside of the support member 5 through the opening. I have.

When the mounting of the support member 5 is completed, as shown in FIG.
O.K. manufactured by Osaka Jack Manufacturing Co., Ltd. J. The power jack EC100H15) 6 is externally inserted into the bolt body 31 and attached to the upper end of the support member 5, and the nut 61 is screwed from the rear end side of the bolt body 31 to move the movable portion 62 of the hollow jack 6.
Tighten the top.

In this state, as shown in FIG. 3 (a), when the hollow jack 6 is driven to move the movable part 62 upward, the bolt body 31 is integrated with the movable part 62 and
3 moves to the rear end side (upward in the figure). At this time, since the rear end of the steel pipe 33 is pressed by the anchor plate 32 and the support member 5, the bolt body 31 relatively moves to the rear end side of the steel pipe 33 in the drilled hole 4, Attachment part 312 of steel pipe tip part 33
Get inside 1. As a result, the steel pipe tip 331 is expanded in the radial direction, and the outer peripheral surface thereof is in close contact with the inner wall surface 41 of the hole.

As shown in FIG. 3 (b), when the steel pipe tip 331 and the bore hole inner wall surface 41 come into close contact with each other, the anchor plate 32 is screwed to the bolt body 31 immediately above the anchor plate 32, as shown in FIG. Tighten 32. As a result, the temporary lock bolt 3 is fixed to the drill hole 4 that penetrates the rock 1 and extends into the ground 2, so that the rock 1 is firmly fixed to the ground 2. When the fixing of the rock 1 by the temporary lock bolt 3 is completed, FIG.
As shown in (c), the hollow jack 6 and the support member 5
From the temporary lock bolt 3.

The construction of the temporary lock bolts 3 described above is repeated, and the rock 1 is fixed to the ground 2 by the three temporary lock bolts 3. Thus, the hollow jack 6
And the support member 5 can be used for construction of another temporary lock bolt 3. Therefore, it is not necessary to prepare the hollow jack 6 and the supporting member 5 for each of the plurality of temporary lock bolts 3. Cost can be reduced.

When the fixing of the rock 1 to the ground 2 (lock bolt construction) is completed, a plurality of holes 11 are formed in the first region R1 where the temporary lock bolt 3 is not attached, as shown in FIG. And a rock drill (e.g., K-2 manufactured by Hirado Metal Industry Co., Ltd.)
A crack is generated by 5W40A400) 7 and the rock 1 is removed while being divided into small pieces that can be transported.

When the removal of the rock 1 in the first region R1 is completed, prior to the removal of the rock 1 in the second region R2,
It is necessary to pull out the temporary lock bolt 3 attached to the second region R2. This is because if the temporary lock bolts 3 are left inserted in the rock 1, the temporary rock bolts 3 prevent the cracks from being generated by the rock breaking machine 7, and it is difficult to break the rocks 1. Hereinafter, a method of applying the temporary lock bolt 3 when extracting the temporary lock bolt 3 from the hole 4 will be described.

First, as shown in FIG. 5A, a locking member 8 composed of a pair of locking pieces 81 is locked to both ends of the anchor plate 32.

FIGS. 10A and 10B are views showing the locking member 8, wherein FIG. 10A is a plan view and FIG. 10B is a front sectional view. Each locking piece 81 is formed in a C-shape in a plan view, as shown in FIG.
A lower flange 811 that engages with the flange 321 is formed, and a projection 812 that engages with a support member 9 described later is formed at the upper end thereof. Then, the locking pieces 81 are brought into contact with each other and locked at both ends of the anchor plate 32, so that three protrusions 81 are formed on the peripheral edge thereof.
An annular locking member 8 provided with 2 is formed.

Subsequently, as shown in FIG. 5B, the supporting member 9 is locked to the locking member 8.

FIGS. 11A and 11B are views showing the support member, FIG. 11A is a plan view, and FIG. 11B is a front view. As shown in the figure, the support member 9 is formed in a cylindrical shape, and has three flange portions 91 formed at the lower end of the inner wall surface thereof so as to be locked with the projections 812 of the locking member 8. . The projection 812 of the locking member 8 can be fitted into a gap 92 formed between the adjacent flanges 91. Furthermore, on the side surface of the support member 9,
An opening 93 is formed, through which the nut 34 screwed to the bolt body 31 can be tightened from outside the support member 9, for example.

The locking member 8 and the supporting member 9 configured as described above are locked as shown in FIG. FIG.
It is the top view which looked at the locking member 8 and the support member 9 from the upper end side. As shown in FIG. 9A, first, the position of each gap 92 of the support member 9 is positioned so as to coincide with each protrusion 812 of the locking member 8, and the support member 9 is positioned from above the locking member 8. Extrapolate. When the support member 9 is rotated from this state by 60 ° in the α direction in the figure, the flange portion 91 of the support member 9 is positioned below the protrusion 812 of the locking member 8 as shown in FIG. And the support member 9 and the locking member 8 are locked.

Returning to FIG. 5, the description of the method of applying the temporary lock bolt 3 will be continued. As shown in FIG. 5C, when the mounting of the support member 9 is completed, the hollow jack 6 used for fixing the rock 1 is mounted on the upper end of the support member 9. Then, the nut 34 tightening the anchor plate 32
Is moved upward along the bolt body 31 so as to contact the lower surface of the movable portion 62 of the hollow jack 6.

Subsequently, as shown in FIG. 6A, when the hollow jack 6 is driven to move the movable portion 62 downward, the bolt main body 31 is integrated with the movable portion 62 to form the steel pipe 3.
3 moves to the tip side. As a result, the steel pipe tip 331
Retreats from the bore hole inner wall surface 41, the tight contact between the steel pipe tip 331 and the bore hole inner wall surface 41 is released, and the bolt body 31 and the steel pipe 33 can be pulled out from the bore hole 4.

Then, as shown in FIG. 3B, after the hollow jack 6 and the nut 34 are removed from the bolt body 31, the support member 9, the anchor plate 32 and the steel pipe 33 are removed.
From the drill hole 4. Here, since the support member 9 is locked to the anchor plate 32 via the locking member 8,
When the support member 9 is moved upward, the anchor plate 3 is moved.
The steel pipe 2 and the steel pipe 33 can be pulled out of the hole 4 integrally with the support member 9. And finally, the bolt body 3
1 is pulled out from the hole 4, and the pulling out of the temporary lock bolt 3 is completed.

When the temporary lock bolt 3 attached to the second area R2 is extracted in this manner, the second area R2 is divided into small pieces by the rock drill 7 and removed as shown in FIG. Then, by repeating the above method, the third
While sequentially pulling out the temporary lock bolts 3 in the region R3 and the fourth region R4, the rock 1 is divided into small pieces by the rock breaking machine 7, and the rock 1 is removed.

As described above, in the temporary lock bolt 3 according to this embodiment, the outer diameter of the tip portion in the drilling hole 4 that penetrates the rock 1 and extends into the ground 2 in the drilling direction X. Is inserted, and a steel pipe 33 whose distal end is expandable and retractable is inserted through the bolt body 31. Then, by moving the bolt body 31 to the rear end side of the steel pipe 33, the steel pipe tip 331 is moved.
Is expanded in the radial direction and is brought into close contact with the inner wall surface 41 of the hole. Therefore, the temporary lock bolt 3 penetrates the rock 1 and the ground 2
Since the rock 1 is firmly fixed to the bore 4 extending inward, the rock 1 can be fixed to the ground 2 with excellent strength.

On the other hand, when the bolt body 31 is moved toward the tip of the steel pipe 33 from this fixed state, the close contact between the steel pipe tip 331 and the inner wall surface 41 of the bore is released, and the bolt body 31 and the steel pipe 33 are bored. 4 can be extracted. Therefore, the rock 1 can be fixed to the ground 2 to prevent the rock 1 from dropping during the work, and the rock 1 can be removed while the bolt body 31 and the steel pipe 33 are sequentially pulled out from the drilled hole 4. Temporary fixation of the rock 1 by the rock bolt having the problem becomes possible.

The temporary lock bolt 3 is provided with a hole 4
Can be used repeatedly for fixing the rock 1 and the like, and the construction cost for temporarily fixing the rock and the like can be reduced.

Further, by constructing the bolt body 31 as follows, the bonding strength between the steel rod 311 and the attachment part 313 can be improved. That is, as shown in FIG. 13, the bolt body 31 is connected to a steel rod 311 having a male screw formed on the entire body and a through-hole 31 along the rotational symmetry axis.
It comprises an attachment part 313 in which 31 is formed, and a nut 341 for fastening the tip of the attachment part 313. A female screw that can be screwed into a male screw of the steel rod 311 is formed in the through hole 3131 of the attachment part 313, and the tip of the steel rod 311 is attached to the attachment part 31.
3 to be integrated with the female screw of
Is projected from the tip of the attachment 313. Further, two nuts (fastening members) 314 are screwed to the tip of the steel rod 311 protruding from the tip of the attachment 313, and the tip of the attachment 313 is fastened via the washer 315. .

As described above, since the steel rod 311 is screwed into the attachment part 313 and the attachment part 313 is fastened by the nut 314 by forming the bolt body 31, the steel rod 311 and the attachment part 3 are connected.
13 are strongly bonded. Therefore, the steel pipe 33 can be expanded in the radial direction by pulling up the bolt main body 31 with a strong force, and as a result, the steel pipe 33 is
1, and the pull-out strength and pull-out durability of the temporary lock bolt 3 can be improved. The number of nuts 314 fastened to the tip of the steel rod 311 is not limited to two, and may be arbitrarily determined according to a desired fastening strength.
Also, a steel rod 311 is coated with a hard rubber 3111 or the like,
The corrosion resistance of the steel rod 311 may be improved.

The nut for tightening the distal end of the attachment 313 may be configured as follows. That is, as shown in FIG. 14, the nut 316 is formed in a truncated cone shape having an upper bottom portion having the same shape as the distal end surface of the attachment portion 313 and having the same inclination as the side surface of the attachment portion 313. By attaching the nut 316 to the tip of the attachment 313, the attachment 313 and the nut 316 form a tapered shape with a wider skirt. By doing so, the shape of the skirt spreading can be lengthened by the length of the nut 316, and the contact area between the bolt body 31 and the steel pipe 33 can be increased. As a result, the steel pipe 33 can be more firmly adhered to the bore inner wall surface 41. In FIG. 14,
Although a portion where the nut 316 is screwed with the steel rod 311 is a hole that does not penetrate, a through hole may be formed and screwed with the steel rod 311.

When a deformed PC steel bar is used as the steel bar 311, for example, the shape of the screw portion is special. Therefore, it is not easy to form a female screw to be screwed into the attachment portion. It was very difficult to form a female screw of about 20 cm or more. Therefore, in order to completely screw the deformed PC steel bar 311 into the long attachment portion, the attachment portion may be prepared as follows. First, as shown in FIG. 15A, a through-hole 3171 for forming a female screw is formed in the attachment portion 317 having a skirt. Then, the attachment portion 317 is divided into a plurality of truncated cone portions (divided portions) 3 in the drilling direction.
172 so that the height of each truncated cone portion 3172 is, for example, 20 cm or less (FIG. 13B). Subsequently, a female screw is formed in the through hole 3171 of each of the truncated cone portions 3172 (FIG. (C)).

By doing so, each of the truncated cone portions 3172
Functions like a nut and has a small frustoconical portion 317
2 and the frustoconical portions 3172 are brought into close contact with each other, and the attachment portion 317 having a wider skirt can be formed (FIG. 4D). Therefore, even if the long attachment part 317 is divided, the deformed PC steel rod 3
A female screw that can be screwed into the hole 11 can be formed in the entire through hole 3171 of the attachment part 317. as a result,
The deformed PC steel rod 311 and the attachment part 317 are completely screwed, and the bonding strength can be improved. In addition,
Since the female screw of each truncated cone portion 3172 is formed based on the through hole 3171 formed in the attachment portion 317 before being divided, the axes of the female screws are all the same, and the deformed PC steel rod 311 is formed. Even if it is screwed into and brought into close contact with each other, a flared shape can be formed without shifting.

The present invention is not limited to the above embodiment, and various changes other than those described above can be made without departing from the gist of the present invention. For example, the temporary lock bolt 3 of the above embodiment is used for temporarily fixing the rock 1, but is not limited to this, and for example, prevents the ground surface from slipping off the ground. It can also be used to temporarily fix the ground surface part, or to temporarily fix the concrete formed on the ground surface to the ground,
It can be used to temporarily fix an object to be fixed to the ground.

In the above embodiment, the bolt body 31
Although the hydraulic hollow jack 6 is used as a driving device for relatively moving the steel tube 33 with respect to the steel pipe 33, the driving device is not limited to this. For example, a driving device such as an air jack or a motor may be used. In short, it is sufficient that the bolt main body 31 can be relatively moved with respect to the steel pipe 33.

Also, irregularities or grooves may be provided on the outer peripheral surface of the steel pipe tip 331. In this case, for example, even when the ground is soft, the steel pipe tip 311 and the bored inner wall surface 41 may be provided. And the adhesion strength with the substrate can be increased.

Further, the above-mentioned temporary lock bolt 3 is used as a lock bolt for temporarily fixing rocks or the like. For example, after the temporary lock bolt 3 is used a plurality of times, it is used as a permanent lock bolt. Is also good. That is, after inserting and fixing the temporary lock bolt 3 into a drill hole formed in rock or the like, a cement material such as cement milk or mortar is injected into the drill hole to completely insert the temporary lock bolt 3 into the drill hole. Fixed to. By doing so, for example, the temporary lock bolt 3 which has become difficult to use repeatedly due to increased wear of the bolt body 31 and the steel pipe 33 can be used as a permanent lock bolt by using a solidifying material. In addition, effective utilization of materials can be achieved.

[0052]

As described above, according to the present invention, a bar-shaped member having a flared tip is inserted into a drilled hole penetrating an object to be fixed and extending into the ground, and a tip portion is formed in a radial direction. By inserting the expandable and retractable steel pipe through the rod-shaped member and moving the rod-shaped member relatively to the rear end side of the steel pipe, the tip end of the rod-shaped member can make the tip end of the steel pipe adhere to the inner wall surface of the borehole, The object to be fixed can be fixed to the ground with excellent strength. On the other hand, by moving the rod-shaped member relatively to the tip side of the steel pipe, the close contact between the tip end of the steel pipe and the inner wall surface of the drilled hole can be released, so that the rod-shaped member and the steel pipe can be extracted from the drilled hole, for example, on the ground. The fixed object fixed to the ground can be removed from the ground. Therefore, the object to be fixed can be temporarily fixed by the lock bolt, which has been conventionally required.

Further, the bar-shaped member can be constituted by attaching an attachment portion to the tip of the steel bar, which makes it possible to reduce the length of the bar-shaped member compared to the case where the bar-shaped member is integrally formed.
Its manufacture is easy, and the cost of the rod-shaped member can be reduced. In addition, it is possible to prepare attachment parts having different shapes from each other, select an attachment part suitable for work at the work site, attach it to the tip of the steel rod to complete the rod member, and complete the rod member. By sharing the steel bars to be configured and selecting only the attachment portion, it is possible to accurately cope with the work site and improve workability.

[Brief description of the drawings]

FIG. 1 is a view showing a method of removing rock using an embodiment of a temporary lock bolt according to the present invention.

FIG. 2 is a diagram showing a method of removing rock using an embodiment of a temporary lock bolt according to the present invention.

FIG. 3 is a view showing a method of removing rock using an embodiment of a temporary lock bolt according to the present invention.

FIG. 4 is a view showing a method of removing rock using an embodiment of a temporary lock bolt according to the present invention.

FIG. 5 is a view showing a method of removing rock using an embodiment of a temporary lock bolt according to the present invention.

FIG. 6 is a view showing a rock removing method using the temporary lock bolt according to one embodiment of the present invention.

FIG. 7 is a view showing a method of removing rock using an embodiment of a temporary lock bolt according to the present invention.

FIG. 8 is a perspective view of a bolt main body in the temporary lock bolt according to the present invention.

FIG. 9 is a side view of the steel pipe and the anchor plate in the temporary lock bolt according to the present invention.

FIG. 10 is a view showing a locking member used in a rock removing method using a temporary lock bolt according to an embodiment of the present invention.

FIG. 11 is a view showing a support member used for a rock removing method using the temporary lock bolt according to one embodiment of the present invention.

FIG. 12 is a diagram illustrating locking between a locking member and a support member.

FIG. 13 is a partial cross-sectional view showing another configuration example of the bolt body.

FIG. 14 is a partial sectional view showing another example of the configuration of the bolt body.

FIG. 15 is a partial sectional view showing another configuration example of the bolt body.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Rock (fixed object) 2 ... Ground 3 ... Temporary lock bolt 4 ... Drilling 6 ... Hollow jack (drive device) 31 ... Bolt body (rod-shaped member) 32 ... Anchor plate (plate) 33 ... Steel pipe 41 ... Drilling Inner wall surface 311 steel bar 312 313 317 attachment part 314 316 nut (fastening member) 331 steel pipe tip 3131 3171 through hole 3172 truncated cone part

[Procedure amendment]

[Submission date] November 14, 2000 (200.11.
14)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

2. The rod-shaped member includes a steel rod having a male screw formed at least at a tip end thereof and extending in the drilling direction. An attachment part in which a through-hole through which the steel rod can be inserted is formed in the drilling direction, and an internal thread formed on at least a part of the inner surface of the through-hole, which can be screwed into a male screw of the steel rod; One or two or more fastening members that are screwed into the tip of the steel bar protruding from the tip side of the attachment portion and tighten the tip of the attachment portion; and the attachment portion and the fastening member are the steel bar. The temporary lock bolt according to claim 1, wherein the temporary lock bolt is attached to a tip end of the lock bolt.

3. The attachment part comprises a plurality of divided sections divided in the drilling direction, and the steel is inserted into at least the through hole of the last one of the plurality of divided sections. 3. The temporary lock bolt according to claim 2, wherein a female screw which can be screwed with the male screw of the rod is formed.

4. A method for constructing a lock bolt for temporarily fixing an object to be fixed to the ground, wherein the method penetrates the object to be fixed along a predetermined drilling direction, and further extends inside the ground. A hole forming step of forming a hole, a rod-shaped member inserting step of inserting a rod-shaped member having an outer diameter of a tip portion increasing in the hole forming direction into the hole, A steel pipe with a plate attached to its rear end during or after the rod insertion process
, Said a steel pipe insertion step of inserting into the drilling while inserted into the rod member, radially to the steel tube tip by the tip portion of the rod-shaped member by relatively moving the rod-shaped member on the rear side of the steel pipe And a fixing step of tightening the fixed object by the plate to fix the fixed object to the ground, and, if necessary, After releasing the fastening of the fixed object, the rod-shaped member is relatively moved from the close contact state to the distal end side of the steel pipe to release the close contact between the distal end of the steel pipe and the inner wall surface of the drilled hole. An extraction step of extracting a rod-shaped member and the steel pipe from the drilled hole, the method comprising:

5. further comprising a driving device preparation step of preparing a driving system for relatively moving the bar-like member in the boring forming direction relative to the steel tube, said in the adhesion step and the extraction step, the driving device The method according to claim 4 , wherein the rod member is moved relative to the steel pipe in the drilling direction.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0005

[Correction method] Change

[Correction contents]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and after temporarily fixing an object to the ground with excellent strength, the fixing can be released as needed, and the ground can be removed.
An object of the present invention is to provide a temporary lock bolt capable of repeatedly fixing an object to be fixed and a lock bolt construction method using the temporary lock bolt.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction contents]

[0006]

SUMMARY OF THE INVENTION In a temporary lock bolt according to the present invention, an outer diameter of a tip portion increases in a drilled hole penetrating an object to be fixed and extending into the ground as the drilling direction is increased. The rod-shaped member is inserted, and a steel pipe whose distal end is expandable and retractable can be inserted into the rod-shaped member. In addition, the rear end of the steel pipe can be engaged with an object
Plate is attached. Then, when the rod-shaped member and the steel pipe are inserted into the drilled hole and the rod-shaped member relatively moves to the rear end side of the steel pipe, the distal end of the steel pipe is expanded in the radial direction to be in close contact with the inner wall surface of the drilled hole. For this reason, the fixed object can be fixed to the ground with excellent strength.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction contents]

[0013] Further, according to the lock bolt construction method of the present invention, a rod-shaped member having a flared tip and a bar-shaped member having a flared end is formed in a drilled hole that penetrates an object and extends into the ground.
After the insertable steel pipe is inserted, the rod-shaped member is relatively moved to the rear end side of the steel pipe. As a result, the distal end of the steel pipe is radially expanded by the distal end of the rod-shaped member, and the outer peripheral surface of the distal end of the steel pipe comes into close contact with the inner wall surface of the hole. Also, the rear end of the steel pipe
Is fixed to the ground by tightening the fixed object with the plate.

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction contents]

Further, from this state, after the plate is released from tightening as necessary, the rod-shaped member is relatively moved to the tip of the steel pipe, whereby the close contact between the tip of the steel pipe and the inner wall surface of the hole is released. Thus, the bar-shaped member and the steel pipe can be extracted from the hole. Therefore, while the object to be fixed can be fixed to the ground with excellent strength, the bar-shaped member and the steel pipe can be extracted from the drilled hole as needed, so that the object to be fixed can be temporarily fixed to the ground. For example, an object to be fixed to the ground can be removed from the ground by extracting the rod-shaped member and the steel pipe from the hole. Also pull out
For rods, steel pipes and plates
Can be used repeatedly for rock bolt construction
You. Therefore, it greatly contributes to the reduction of construction costs.

[Procedure amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0052

[Correction method] Change

[Correction contents]

[0052]

As described above, according to the present invention, a bar-shaped member having a flared tip is inserted into a drilled hole penetrating an object to be fixed and extending into the ground, and a tip portion is formed in a radial direction.
Expandable and retractable, with a plate attached to the rear end
By inserting the steel pipe into the rod-shaped member and moving the rod-shaped member relatively to the rear end side of the steel pipe, the tip end of the rod-shaped member can bring the steel pipe tip into close contact with the inner wall surface of the borehole,
The object to be fixed can be fixed to the ground with excellent strength. On the other hand, by moving the rod-shaped member relatively to the tip side of the steel pipe, the close contact between the tip end of the steel pipe and the inner wall surface of the drilled hole can be released, so that the rod-shaped member and the steel pipe can be extracted from the drilled hole, for example, on the ground. The fixed object fixed to the ground can be removed from the ground. Therefore, the object to be fixed can be temporarily fixed by the lock bolt, which has been conventionally required. In addition, this temporary lock bolt is
Because it is configured to be removable, for example,
Temporary lock bolts used for fixing were removed from the drilled holes
After that, the lock bolt is used as it is for fixing the
It can be used repeatedly as a hook bolt. I
Therefore, when temporarily fixing the fixed object to the ground
Construction cost can be reduced. ────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] February 13, 2001 (2001.2.1)
3)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claim 1

[Correction method] Change

[Correction contents]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] Claim 4

[Correction method] Change

[Correction contents]

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction contents]

[0006]

SUMMARY OF THE INVENTION In a temporary lock bolt according to the present invention, an outer diameter of a tip portion increases in a drilled hole penetrating an object to be fixed and extending into the ground as the drilling direction is increased. The rod-shaped member is inserted, and a plurality of slits are formed in the rod-shaped member from the front end to the rear end.
A steel pipe which is provided in a notch toward the end and whose distal end is expandable and retractable can be inserted. At the rear end of the steel pipe, a plate capable of engaging with an object to be fixed is attached. Then, in a state in which the rod-shaped member and the steel pipe are inserted into the hole, the rod-shaped member relatively moves to the rear end side of the steel pipe while the notch-shaped slit remains in the steel pipe, thereby expanding the tip end of the steel pipe in the radial direction. To make close contact with the inner wall surface of the hole. For this reason, the fixed object can be fixed to the ground with excellent strength.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction contents]

Further, according to the method for constructing a lock bolt according to the present invention, a rod-shaped member having a flared tip can be inserted into a drilled hole that penetrates an object and extends into the ground, and can be inserted through the rod-shaped member . In addition, multiple slits
Is provided in a notch toward the rear end, and the front end is
After the steel pipe, which is capable of being extended and retracted , is inserted, the rod-shaped member is relatively moved to the rear end side of the steel pipe. Thereby , the tip of the steel pipe is radially expanded by the tip of the rod-shaped member while leaving the cut slit in the steel pipe ,
The outer peripheral surface of the tip of the steel pipe is in close contact with the inner wall surface of the hole. In addition, a plate is attached to the rear end of the steel pipe, and the object can be firmly fixed to the ground by tightening the object with the plate.

Claims (6)

[Claims] 1. A lock bolt which penetrates an object to be fixed along a predetermined drilling direction and is inserted and fixed in a hole extending into the ground to fix the object to the ground. A rod-shaped member that can be inserted into the hole, and the outer diameter of the tip of the rod-shaped member increases in the hole-forming direction; and inserted into the hole while being inserted through the rod-shaped member. A steel pipe whose tip has an inner diameter smaller than the outer diameter of the tip of the rod-shaped member, and whose tip is capable of expanding and retracting in the radial direction. The rod-shaped member is relatively movable in the drilling direction, and the rod-shaped member is relatively moved to the rear end side of the steel pipe so that the distal end of the rod-shaped member causes the distal end of the steel pipe to move in the radial direction. To the inner wall surface of the drilling On the other hand, the rod-shaped member is relatively moved toward the distal end side of the steel pipe from the adhered state, thereby releasing the close contact between the steel pipe distal end portion and the inner wall surface of the drilled hole. Temporary lock bolt characterized in that it can be extracted from a drilled hole. 2. The bar-shaped member is composed of a steel rod extending in the drilling direction and an attachment part whose outer diameter increases from the top in the drilling direction. 2. The temporary lock bolt according to claim 1, wherein a top portion of the attachment portion is attached to a tip portion of the steel bar. 3. The rod-shaped member has a steel rod having a male screw formed at least at a tip end thereof and extending in the drilling direction, and an outer diameter increases from a top of the rod in the drilling direction. An attachment part in which a through-hole through which the steel rod can be inserted is formed in the drilling direction, and an internal thread formed on at least a part of the inner surface of the through-hole, which can be screwed into a male screw of the steel rod; One or two or more fastening members that are screwed into the tip of the steel bar protruding from the tip side of the attachment portion and tighten the tip of the attachment portion; and the attachment portion and the fastening member are the steel bar. The temporary lock bolt according to claim 1, wherein the temporary lock bolt is attached to a tip end of the lock bolt. 4. The attachment part is composed of a plurality of divided sections divided in the drilling direction, and the steel is inserted into at least a through hole of the last divided part of the plurality of divided sections. 4. The temporary lock bolt according to claim 3, wherein a female screw which can be screwed with the male screw of the rod is formed. 5. A method for constructing a lock bolt for temporarily fixing an object to be fixed to the ground, wherein the rock bolt penetrates the object to be fixed along a predetermined drilling direction and further extends inside the ground. A hole forming step of forming a hole, a rod-shaped member inserting step of inserting a rod-shaped member having an outer diameter of a tip portion increasing in the hole forming direction into the hole, Along with the step, or after the rod-shaped member inserting step, a steel pipe insertion step of inserting the steel pipe into the drilled hole while inserting the steel pipe through the rod-shaped member, and by relatively moving the rod-shaped member to the rear end side of the steel pipe, A step of radially expanding the distal end of the steel pipe with a distal end to closely contact the inner wall surface of the drilled hole; and tightening the fixed object by a plate attached to a rear end side of the rod-shaped member. The above A fixing step for fixing to the panel, and, if necessary, after releasing the fastening of the object to be fixed by the plate, the rod-shaped member is relatively moved from the close contact state to the distal end side of the steel pipe to thereby form the tip of the steel pipe. A step of releasing the close contact between the portion and the inner wall surface of the hole, and extracting the rod-shaped member and the steel pipe from the hole. 6. A driving device preparing step for preparing a driving device for moving the rod-shaped member relatively to the steel pipe in the drilling direction, wherein the driving device is provided in the contacting step and the extracting step. 6. The method according to claim 5, wherein the rod-shaped member is moved relative to the steel pipe in the drilling direction.