JP2003253999A - Work execution method for self-drilling lock bolt and anchor structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To work execute a self-drilling lock bolt whose strength is increased. <P>SOLUTION: In the work execution method for a self-drilling lock bolt 2, the self-drilling lock bolt 2 that has a screw section on its peripheral surface and is made of a pipe-like hollow steel is placed on the foundation by drilling using a bit 1 at the tip of the bolt, a grout material 22 is filled from the inside of the self-drilling lock bolt 2 to the inside or outside through the bit 1, at the same time the head of the bolt is clamped by a nut 9, and its introduction force is transmitted to the foundation. In the execution method, a wire 4 having a grip 5 is inserted into the inside from the head section of the self-drilling lock bolt 2 to the tip before curing the grout material 22, the grip 5 is brought into contact with or connected to the head end section of the self-drilling lock bolt 2 for curing and hardening the grout material 22, the nut 9 is clamped to the head section of the self-drilling lock bolt 2, and specific tension is introduced to the self-drilling lock bolt 2. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction method and anchor structure for a self-drilling rock bolt used for stabilizing slopes and tunnels.

[0002]

2. Description of the Related Art Generally, rock bolts are used to stabilize the ground such as tunnels and slopes.
A hole is drilled deep in the ground, a lock bolt is inserted into the hole, the grout material is filled, and the rock bolt is fixed to the ground by the fixing force of the grout material. The anchoring power stabilizes the upper ground of the tunnel. In addition, by applying tension to the lock bolt on the surface side of the pressure receiving plate (law frame, PC plate, etc.) installed on the ground surface, the pressure receiving plate acts as a reaction force and tightens the ground to stabilize the slope. It is a thing.

Then, a PC steel material is inserted into the center hole of the self-drilling lock bolt to form a rod as a lock bolt.
A self-drilling lock bolt (Japanese Patent Laid-Open No. 11-343800) for increasing the strength by adding a PC steel material is disclosed.

[0004]

However, in this method, the self-drilling rock bolt embedded on the ground side is long,
The length of the protrusion with respect to the head side is shorter than the height of the cap. As a result, the stress transmitting portion (nut for screw type lock bolt, anchor head for PC steel material) of the pressure receiving plate head of the self-drilling lock bolt is sandwiched, and adhesion to the self-drilling lock bolt is made on the ground side and the head side of the PC steel material. The strength is extremely different, and when the ground loosens and a large stress acts between the pressure plate and the fixing part of the self-drilling rock bolt (underground side), the self-drilling rock bolt acts as a shearing force at the fixing part and self-drilling. When the lock bolt is elastically deformed or plastically deformed and stretched, the adhesion of the PC steel material adhered to the grout material on the head side is broken between the self-drilling lock bolt or the PC steel material, and the PC steel material Does not contribute to the increase in strength of the self-drilling rock bolt.

This is because the fixing force on the fixing portion side with respect to the PC steel material is ignored, and the self-drilling lock bolt alone receives the load, and the PC steel material inserted into the self-drilling lock bolt is a self-drilling lock bolt. It has no effect on the strength of the product and has become a useless long product.

Further, since the self-drilling rock bolt is not provided with irregularities inside, the PC steel material and the self-drilling rock bolt cannot be reliably integrated with each other through the grout material, and the self-drilling rock bolt is grounded. Depending on the embedding length of
In some cases, the C steel material may be insufficiently adhered to the self-drilling lock bolts and may escape, and there is a risk that the proof strength of the PC steel material may not be fully utilized.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a method of constructing a self-drilling rock bolt and an anchor structure having increased strength.

[0008]

In order to solve the above-mentioned problems and to achieve the object, the present invention has the following constitution.

According to a first aspect of the present invention, a self-drilling rock bolt made of pipe-shaped hollow steel having a threaded portion on its peripheral surface is driven into the ground by drilling with a bit at the tip of the bolt, and the self-drilling rock bolt. In the construction method of the self-drilling rock bolt that fills the inside and outside of the grout material from inside to outside with the bit and tightens the bolt head with the nut to transmit the introduction force to the ground, grip before hardening the grout material. Insert the wire rod having the above from the head to the tip of the self-drilling rock bolt, and contact or connect the grip to the head end of the self-drilling rock bolt to cure and solidify the grout material, and the self-drilling. A method of constructing a self-drilling rock bolt, characterized in that a nut is tightened on the head of the lock bolt, and a predetermined tension is introduced into the self-drilling rock bolt. That.

According to the first aspect of the present invention, the wire rod having the grip is inserted into the self-piercing lock bolt before the grout material is hardened, and the grip is applied to the head end of the self-piercing lock bolt. By contacting or connecting to cure and solidify the grout material and tightening the nut on the head of the self-drilling lock bolt, the head side of the wire is fixed on the head side of the self-drilling lock bolt, and inside the self-drilling lock bolt. Since the structure for inserting the wire rod can be integrated, the strength of the wire rod is transmitted to the self-drilling lock bolt by this integration, so that the tensile strength,
Shear strength and bending resistance can be increased.

According to a second aspect of the present invention, a self-drilling rock bolt made of pipe-shaped hollow steel having a threaded portion on its peripheral surface is driven into the ground by drilling with a bit at the tip of the bolt, and the self-drilling rock bolt is provided. In the construction method of the self-drilling lock bolt that fills the inside and outside of the grout material from inside to outside with the bit and tightens the bolt head with the nut to transmit the introduction force to the ground. With a plurality of wire rods having grips inserted in the holes of the self-drilling lock bolts, the grips are inserted into the interior from the head to the tip of the self-drilling lock bolts, and the grips contact the head end face of the self-drilling lock bolts via the washers Until the state is fixed, the grout material is cured and solidified, and a nut is tightened on the head of the self-drilling lock bolt, so that the self-drilling lock bolt has a predetermined length. A method of constructing the self drilling rock bolt and introducing the force.

According to the second aspect of the present invention, a plurality of wire rods having grips are inserted into the holes of the washer before the grout material is hardened, and the wire rods are inserted into the self-drilling lock bolts. By tightening until the state where it abuts the head end surface of the self-drilling lock bolt through the washer to cure and solidify the grout material and tighten the nut on the head of the self-drilling lock bolt, the head side of the wire rod is self-drilling locked. It is fixed on the head side of the bolt, and the wire rod can be integrated into the self-drilling lock bolt, and the strength of the wire rod is transmitted to the self-drilling lock bolt by this integration. It is possible to increase the yield strength and the yield strength against bending.

The invention according to a third aspect is characterized in that the self-drilling lock bolt has a wall thickness which causes unevenness of the rope screw inside the pipe material when the pipe material is processed into an outer rope screw. It is a construction method of the self-drilling rock bolt according to claim 1 or 2.

According to the third aspect of the present invention, the wire rod can be securely fixed to the inside of the self-drilling rock bolt through the grout material due to the unevenness of the pipe material and the wire rod unevenness of the self-drilling rock bolt. Since the structure for inserting the wire rod is integrated and the proof stress of the wire rod is transmitted to the self-drilling lock bolt, the behavior of the self-drilling lock bolt and the wire rod are matched as a whole, and the proof stress of the self-drilling lock bolt is improved. You can

According to a fourth aspect of the present invention, a wire rod curing holder is attached to the head of the self-piercing lock bolt to cure and solidify the grout material, and the wire rod curing holder is removed to remove the self-piercing lock bolt. The method for constructing a self-drilling lock bolt according to any one of claims 1 to 3, characterized in that a nut is tightened on the head of the.

According to the invention of claim 4, the wire rod curing holder is mounted on the head of the self-drilling lock bolt,
The wire having a grip can be protected to cure and solidify the grout.

The invention according to claim 5 is made of pipe-shaped hollow steel having a threaded portion on its peripheral surface, and is driven into the ground by drilling a bit at the tip of a bolt, and at the same time through the bit from inside the bolt. Fill the inside and outside with grout material,
In an anchor structure that allows the introduction force generated by tightening the bolt head with a nut to be transmitted to the ground, insert a wire rod that has a grip before the grout material hardens from the head to the tip of the self-piercing lock bolt. Then, the grip is brought into contact with or connected to the head end portion of the self-drilling lock bolt to cure and solidify the grout material, and a nut is tightened on the head of the self-drilling lock bolt to fix the self-drilling lock bolt to a predetermined position. The anchor structure is characterized by introducing the tension.

According to the invention of claim 5, the wire rod having the grip is inserted into the self-drilling lock bolt before the grout material is hardened, and the grip is applied to the head end portion of the self-drilling lock bolt. By contacting or connecting to cure and solidify the grout material and tightening the nut on the head of the self-drilling lock bolt, the head side of the wire is fixed on the head side of the self-drilling lock bolt, and inside the self-drilling lock bolt. Since the structure for inserting the wire rod can be integrated, the strength of the wire rod is transmitted to the self-drilling lock bolt by this integration, so that the tensile strength,
Shear strength and bending resistance can be increased.

The invention according to claim 6 is made of pipe-shaped hollow steel having a threaded portion on its peripheral surface, is driven into the ground by drilling a bit at the tip of the bolt, and is passed through the bit from the inside of the bolt. Fill the inside and outside with grout material,
In the anchor structure that allows the introduction force generated by tightening the bolt head with the nut to be transmitted to the ground, the self-drilling in a state in which a plurality of wire rods having grips are inserted into holes of the washer before the grout material is hardened. Inserted inside from the head to the tip of the lock bolt, tightened until the grip comes into contact with the head end surface of the self-drilling lock bolt through the washer, curing and solidifying the grout material,
The anchor structure is characterized in that a nut is tightened on the head of the self-drilling lock bolt to introduce a predetermined tension into the self-drilling lock bolt.

According to the sixth aspect of the present invention, the wire rod having a plurality of grips is inserted into the hole of the washer before the grout material is hardened, and the wire rod is inserted into the self-drilling lock bolt so that the grip is By tightening until the state where it abuts the head end surface of the self-drilling lock bolt through the washer to cure and solidify the grout material and tighten the nut on the head of the self-drilling lock bolt, the head side of the wire rod is self-drilling locked. It is fixed on the head side of the bolt, and the wire rod can be integrated into the self-drilling lock bolt, and the strength of the wire rod is transmitted to the self-drilling lock bolt by this integration. It is possible to increase the yield strength and the yield strength against bending.

The invention according to claim 7 is characterized in that the self-drilling lock bolt has a wall thickness that causes unevenness of the rope screw even inside the pipe material when the pipe material is processed into an outer rope screw. The anchor structure according to claim 5 or claim 6.

According to the invention as set forth in claim 7, since the inner surface of the pipe material of the self-drilling rock bolt and the unevenness of the wire material can surely fix the material through the grout material, the wire material can be fixed inside the self-drilling rock bolt. Since the structure for inserting the wire rod is integrated and the proof stress of the wire rod is transmitted to the self-drilling lock bolt, the behavior of the self-drilling lock bolt and the wire rod are matched as a whole, and the proof stress of the self-drilling lock bolt is improved. You can

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the self-drilling rock bolt construction method and anchor structure of the present invention will be described below with reference to the drawings, but the present invention is not limited to these embodiments.

First, the construction method and anchor structure of the first self-piercing lock bolt will be described with reference to FIGS. 1 to 8. 1 is a process drawing from drilling to the end of drilling, FIG. 2 is a process drawing of grout material injection to attachment of a wire rod curing holder, FIG. 3 is a process drawing of curing to construction completion, and FIG. 4 is a wire rod having a grip. A cross-sectional view of the inserted self-drilling lock bolt, FIG. 5 is a side view of a wire rod having a grip, FIG. 6 is a cross-sectional view of a self-drilled rock bolt, and FIG. 7 shows a state in which a wire rod curing holder is attached. 8 is a side view of the wire rod curing holder.

In this embodiment, a method of constructing a small diameter self-drilling lock bolt 2 on an inclined surface is such that one wire 4 is inserted into the self-drilling lock bolt 2. As shown in FIG. 5, the wire 4 has a grip 5 at its end and is made of steel stranded wire. Further, as shown in FIG. 6, the self-drilling lock bolt 2 uses a rod having a wall thickness that causes unevenness 6 of the rope screw to be formed inside the pipe when the pipe material is processed into the rope screw on the outside.

The self-drilling lock bolt is constructed by previously constructing the slope 21 on the slope of the ground 20 (FIG. 1 (a)) and setting the punch 30 in the hole 21a at the intersection of the slope 21. Insert the piercing lock bolt 2.

The self-drilling lock bolt 2 is made of pipe-shaped hollow steel having a threaded portion on its peripheral surface, and the self-drilling lock bolt 2 has a bit 1 at the tip of the bolt. Perforator 3
0 is operated to insert it while drilling to a predetermined depth with the bit 1 at the tip of the self-drilling rock bolt 2,
(Fig. 1 (b)).

The punching machine 30 is removed from the self-drilling lock bolt 2, a grout material injection adapter 3 is connected to the head of the self-drilling lock bolt 2, and the bit is inserted from the inside of the self-drilling lock bolt 2 through the injection adapter 3. 1, the necessary amount of grout material 22 is injected into the inside and outside thereof, and is filled into the inside of the self-drilling rock bolt 2 and the hole of the ground 20 (FIG. 2).
(D)).

The grout material injection adapter 3 is detached from the head of the self-drilling lock bolt 2, and the wire 4 having the grip 5 is attached to the self-drilling lock bolt 2 before the grout material 22 is cured.
Insert from the head to the tip of the head (Fig. 2
(E)).

The grip 5 is brought into contact with the end portion of the head of the self-drilling lock bolt 2 (FIG. 4), and the wire rod holder 15 is attached to the head of the self-drilling lock bolt 2 (FIG. 2 (f)). As shown in FIGS. 7 and 8, the wire rod curing holder 15 has a female screw portion 15a in a recess, an external nut portion 15b, and is rotated by the nut portion 15b to self-drill the female screw portion 15a. It is screwed onto the head of the bolt 2, and the grip 5 is held in contact with the head end of the self-piercing lock bolt 2.

While the wire rod curing holder 15 is attached to the head of the self-drilling lock bolt 2, the grout rod is cured and solidified (FIG. 3 (g)), and the wire rod curing holder 15 is removed and the method is performed. A washer 7 and a washer 8 are inserted into the self-drilling lock bolt 2 from above the frame 21, and a nut 9 is tightened on the head of the self-drilling lock bolt 2 to introduce a predetermined tension to the self-drilling lock bolt 2 (FIG. 3). (H)).

The oil cap 1 is attached to the male screw of the washer 8.
0 is tightened and attached (Fig. 3 (i)), and the construction of the self-piercing lock bolt 2 for transmitting the introduction force to the ground is completed (Fig. 3).
(J)).

The method frame 21 may be installed after the self-drilling lock bolt 2 is drilled, or before the self-drilled rock bolt 2 is drilled as in the present configuration. . When used for a tunnel, the legal framework 21 is not used.

As described above, since the unevenness associated with the processing of the outer screw is automatically formed inside the self-drilling lock bolt 2, the grout material 22 is surely fixed to the self-drilling lock bolt 2. It

If the wire rod 4 is made of PC steel wire having a strong adhesion to the grout material 22, a rope screw wire rod having irregularities, or a deformed rebar having a screw node shape, the wire rod 4 is fixed to the grout material 22. The part of the wire 4 embedded in the self-drilling lock bolt 2 is firmly integrated via the grout 22.

Further, the grip 5 is crimped to the end of the wire 4 (a nut may be used for a screw wire or the like), and the ground side end surface of the grip 5 is brought into contact with the head end surface of the self-piercing lock bolt 2. , The self-drilling lock bolt 2 receives the tension received by the tightening portion (fixing nut) of the self-drilling lock bolt 2.
Can be transmitted to the wire 4 from the end of the head portion of the head via the grip 5 (or nut), and the tightening portion of the self-piercing lock bolt 2 and the end of the wire can be integrated.

When the grip 5 of the wire rod 4 abuts on the head end of the self-drilling lock bolt 2, the head side of the wire rod 4 is fixed to the head side of the self-drilling lock bolt 2, and the self-drilling lock is made. Since the protrusions and recesses on the inner side of the bolt 2 and the protrusions and recesses on the wire 4 can securely fix through the grout material 22, the wire rod can be integrated into the self-drilling lock bolt 2.

Since the proof stress of the wire rod 4 is transmitted to the self-drilling lock bolt 2 by integrating both of them, the tensile proof strength, the shear proof strength as the lock bolt using the pressure receiving plate,
The proof stress against bending can be increased.

Next, the construction method and anchor structure of the second self-drilling lock bolt will be described with reference to FIGS. 9 to 14. 9 is a sectional view of a self-piercing lock bolt into which a wire rod having a grip is inserted, FIG. 10 is a sectional view taken along line XX of FIG. 9, FIG. 11 is a view showing a washer, FIG. 12 is a view showing a spacer, and FIG. 13 is a view showing a state in which a wire rod curing holder is attached, with a half cut away, and FIG. 14 is a side view of the wire rod curing holder.

This embodiment is a method of constructing a large-diameter self-drilling lock bolt 13 on an inclined surface, and has a structure in which three wire rods 4 are inserted into the self-drilling lock bolt 13. As shown in FIGS. 9 to 12, the plurality of wire rods 4 have grips 5 at their ends and are made of steel strands. This wire 4
The spacer 11 is inserted through the hole 11a of the washer 11, and a plurality of spacers 14 are attached to predetermined positions of the wire 4 to be integrated. The three wire rods 4 are the engaging recesses 14 a of the spacer 14.
Is held in engagement with.

Further, as shown in FIG. 9, the self-drilling lock bolt 13 uses a rod having a wall thickness that causes unevenness of the rope screw even inside the pipe when processing the outer rope screw of a large-diameter pipe material. , Bit 12.

In order to construct the self-drilling lock bolt 13, the law frame 21 is previously constructed on the slope of the ground 20, and the law frame 21 is installed.
The self-drilling lock bolt 13 with the punching machine set therein is inserted into the hole 21a at the intersection point of.

By operating the punching machine, the self-piercing lock bolt 13
Is drilled to a predetermined depth and mounted, the drilling machine is removed from the self-drilling lock bolt 13, the injection adapter of grout material is connected to the head of the self-drilling lock bolt 13, and the self-drilling lock bolt is inserted through the injection adapter. Bit 1 from inside 13
Inject the necessary amount of grout material 22 inside and outside through 2,
The inside of the self-drilling rock bolt 13 and the hole of the ground 20 are filled.

The grout material injection adapter is removed from the head of the self-drilling lock bolt 13, and before the grout material 22 is hardened, the wire rod 4 having the grip 5 is inserted into the hole 11a of the washer 11, and The perforated lock bolt 13 is inserted inside from the head to the tip.

The grip 5 is brought into contact with the head end of the self-piercing lock bolt 13 via the washer 11, and the wire rod curing holder 15 is mounted on the head of the self-piercing lock bolt 13. As shown in FIG. 13 and FIG.
The concave portion has a female screw portion 15a and an external nut portion 15b. The female screw portion 15a is rotated by the nut portion 15b.
Is screwed onto the head of the self-drilling lock bolt 13. Tighten until the tips of the plurality of wire rods 4 come into contact with the inside of the wire rod curing holder 15 and the grip 5 comes into contact with the head end portion of the self-piercing lock bolt 13 via the washer 11, and then the grout material. 22 is cured and solidified.

The wire curing member holder 15 is removed, the washer and the threaded washer are inserted into the self-drilling lock bolt 13 from above the method frame 21, and the nut is screwed and tightened to give a predetermined tension to the self-drilling lock bolt 13. Introduce and install the oil cap to complete.

Thus, the wire 4 having a plurality of grips 5 in the hole 11a of the washer 11 before the grout material 22 is hardened.
Inserted inside the self-drilling lock bolt 13 and tightened until the grip 5 comes into contact with the head end surface of the self-drilling lock bolt 13 through the washer 11 to cure and solidify the grout material 22. , Self-piercing lock bolt 13
By tightening the nut on the head of the wire rod 4, the head side of the wire rod 4 is fixed to the head side of the self-drilling lock bolt 13, and the wire rod 4 can be integrated into the self-drilling lock bolt 13 as a configuration. By this integration, the proof stress of the wire rod 4 is transmitted to the self-drilling lock bolt 13, so that the tensile proof stress, shear proof stress, and bending proof stress can be increased.

Further, by using the spacer 14, the wire 4
Since the entanglement between them and the contact with the self-drilling lock bolt 13 are hindered, the adhesion with the grout material 22 is improved, and the tensile strength, shear strength, and bending resistance are increased without hindering the effect of the number of the wire rods 4. Is obtained.

Next, the construction method of the third self-drilling rock bolt and the anchor structure will be described with reference to FIGS. 15 to 17. FIG. 15 is a sectional view of a self-drilling lock bolt into which a wire rod having a grip is inserted, FIG. 16 is a side view of the wire rod having a grip, and FIG. 17 is a sectional view of a joint nut.

This embodiment is constructed in the same manner as the construction of the first self-drilling lock bolt described in FIGS. 1 to 14, but the grip 5 provided on the wire 4 has a large-diameter threaded portion. 5a is formed. The large-diameter screw portion 5a of the grip 5 is formed to have the same diameter as the self-drilling lock bolt 2, so that the wire rod 4 having the grip 5 is cured from the head of the self-drilling lock bolt 2 before the grout material 22 is cured. It is inserted into the inside through the tip, the joint nut 16 is screwed and connected to the screw portion 5a of the grip 5 and the head of the self-piercing lock bolt 2, and the grout material 22 is cured and solidified.

As described above, when the grip 5 crimped to the wire 4 is provided with the screw portion 5a, the joint nut 16
By using, the self-drilling lock bolt 2 and the wire 4 can be easily integrated.

In each of the above-described embodiments, the wire rod 4 may be a wire made of PC steel which is expected to adhere to the grout material 22, or may be a wire rod having an external thread on its outer diameter. You can choose a shape that has the effect of adhering to.

If a male screw, which is the same as the self-drilling lock bolt, is provided on a part of the grip 5 of the wire rod 4, the wire rod curing holder may be in the form of a long nut.

Further, the self-drilling lock bolts 2 and 13 can be connected to each other by a plurality of couplers through a coupler, similarly to a general lock bolt, and can be a lock bolt having a required rod length. .

Further, with respect to the washer 8 with a male screw, if the inside of one side is made spherical, by using a spherical male washer,
Even if an angle occurs between the method frame 21 and the self-drilling lock bolt, it is possible to cope with it.

Furthermore, the present invention can be applied to any application using a self-piercing rod. For example, as an anchor material used in tunnels, slopes, rockfall protection works, avalanche prevention works, etc. Since it becomes possible to use, when a plurality of self-drilling lock bolts are used, it is possible to reduce the required number of self-drilling lock bolts, and it is possible to expect great effects such as shortening the construction period and the construction cost.

[0057]

As described above, according to the first aspect of the invention, the wire rod having the grip is inserted into the self-piercing lock bolt before the grout material is hardened, and the grip is attached to the head of the self-piercing lock bolt. By abutting or connecting to the end to cure and solidify the grout material and tightening the nut on the head of the self-drilling lock bolt, the head side of the wire is fixed on the head side of the self-drilling lock bolt, and the self-drilling lock Since the wire rod can be integrated into the inside of the bolt, the strength of the wire rod is transmitted to the self-piercing lock bolt by this integration,
Tensile strength, shear strength, and bending resistance can be increased.

According to the second aspect of the invention, a plurality of wire rods having grips are inserted into the holes of the washer before the grout material is hardened, and the wire rods are inserted into the self-drilling lock bolts so that the grips pass through the washers. The head of the self-drilling rock bolt by tightening until it comes into contact with the head end face of the self-drilling lock bolt, and curing and solidifying the grout material, and then tightening the nut on the head of the self-drilling lock bolt. It is fixed on the part side and the wire rod can be integrated into the self-drilling lock bolt, and the strength of the wire rod is transmitted to the self-drilling lock bolt by this integration, so tensile strength, shear strength, bending It is possible to increase the proof stress against.

According to the third aspect of the present invention, the wire rod is inserted into the self-drilling lock bolt because it can be reliably fixed through the grout material due to the unevenness of the pipe material and the wire rod unevenness of the self-drilling lock bolt. Since the structure is integrated and the proof stress of the wire rod is transmitted to the self-drilling lock bolt, the behavior of the self-drilling lock bolt and the wire rod match as a whole, and the proof stress of the self-drilling lock bolt can be improved.

According to the fourth aspect of the invention, the wire rod curing holder can be attached to the head of the self-drilling lock bolt to protect the wire rod having the grip and to cure and solidify the grout rod.

According to the invention of claim 5, a wire having a grip is inserted into the inside of the self-piercing lock bolt before the grout material is cured, and the grip is brought into contact with or connected to the head end of the self-piercing lock bolt. To cure and solidify the grout,
By tightening the nut on the head of the self-piercing lock bolt,
The head side of the wire rod is fixed to the head side of the self-drilling lock bolt, and the wire rod can be integrated into the self-drilling lock bolt, so that the strength of the wire rod is transmitted to the self-drilling lock bolt. Therefore, tensile strength, shear strength, and bending strength can be increased.

In a sixth aspect of the invention, before the grout material is hardened, a plurality of wire rods having grips are inserted into the holes of the washer, and the wire rods are inserted into the self-drilling lock bolts so that the grips pass through the washers. The head of the self-drilling rock bolt by tightening until it comes into contact with the head end face of the self-drilling lock bolt, and curing and solidifying the grout material, and then tightening the nut on the head of the self-drilling lock bolt. It is fixed on the part side and the wire rod can be integrated into the self-drilling lock bolt, and the strength of the wire rod is transmitted to the self-drilling lock bolt by this integration, so tensile strength, shear strength, bending It is possible to increase the proof stress against.

In the invention described in claim 7, the wire rod is inserted into the self-drilling rock bolt because the inner hole of the pipe material of the self-drilling lock bolt and the wire member of the self-piercing lock bolt can surely fix it through the grout material. Since the structure is integrated and the proof stress of the wire rod is transmitted to the self-drilling lock bolt, the behavior of the self-drilling lock bolt and the wire rod match as a whole, and the proof stress of the self-drilling lock bolt can be improved.

[Brief description of drawings]

FIG. 1 is a process drawing from drilling to completion of drilling.

FIG. 2 is a process drawing of attaching a wire rod curing holder from grout material injection.

FIG. 3 is a process diagram from curing to completion of construction.

FIG. 4 is a cross-sectional view of a self-drilling rock bolt into which a wire rod having a grip is inserted.

FIG. 5 is a side view of a wire having a grip.

FIG. 6 is a sectional view of a self-drilling rock bolt.

FIG. 7 is a fragmentary view showing a state in which a wire rod curing holder is attached.

FIG. 8 is a side view of a wire rod curing holder.

FIG. 9 is a cross-sectional view of a self-piercing lock bolt into which a wire rod having a grip is inserted.

10 is a cross-sectional view taken along line XX of FIG.

FIG. 11 is a view showing a washer.

FIG. 12 is a view showing a spacer.

FIG. 13 is a fragmentary view showing a state in which a wire rod holder is attached.

FIG. 14 is a side view of the wire rod curing holder.

FIG. 15 is a cross-sectional view of a self-piercing lock bolt into which a wire rod having a grip is inserted.

FIG. 16 is a side view of a wire having a grip.

FIG. 17 is a sectional view of a joint nut.

[Explanation of symbols]

1, 12 bits 2,13 Self-drilling lock bolt 3 injection adapter 4 wire rod 5 grips 7 washers 8 washers 9 nuts 10 oil cap 15 Wire rod holder 20 ground 21 legal framework 22 grout 30 punch

Claims (7)

[Claims] 1. A self-drilling rock bolt made of pipe-shaped hollow steel having a threaded portion on its peripheral surface is driven into the ground by drilling a bit at the tip of the bolt, and the self-drilling rock bolt is passed through the bit from the inside of the bolt. A self-drilling lock bolt construction method that fills the inside and outside with grout material, tightens the bolt head with a nut, and transmits the introduction force to the ground.In the method of self-drilling a wire rod having a grip before hardening of the grout material. Inserted from the head to the tip of the lock bolt, the grip is abutted or connected to the head end of the self-drilling rock bolt to cure and solidify the grout material, and a nut is attached to the head of the self-drilled rock bolt. And applying a predetermined tension to the self-drilling lock bolt. 2. A self-drilling rock bolt made of pipe-shaped hollow steel having a threaded portion on its peripheral surface is driven into the ground by drilling with a bit at the tip of the bolt, and the self-drilling rock bolt is passed through the bit from inside the self-drilling rock bolt. In the construction method of the self-drilling rock bolt that fills the inside and outside with the grout material, tightens the bolt head with the nut, and transmits the introduction force to the ground, there are multiple grips in the hole of the washer before hardening of the grout material. The wire rod is inserted into the self-drilling lock bolt from the head to the tip, and the grip is tightened until it comes into contact with the head end face of the self-drilling lock bolt through the washer. The grout material is cured and solidified, a nut is tightened on the head of the self-drilling lock bolt, and a predetermined tension is introduced to the self-drilling lock bolt. How to install self-drilling rock bolts. 3. The self-drilling lock bolt has a wall thickness that causes unevenness of the rope screw inside the pipe material when the pipe material is machined to form the outside rope screw. The method for constructing the self-drilling rock bolt according to 2. 4. A wire rod curing holder is attached to the head of the self-drilling lock bolt to cure and solidify the grout material, the wire rod curing holder is removed, and a nut is tightened to the head of the self-drilling lock bolt. The method for constructing a self-drilling rock bolt according to any one of claims 1 to 3, wherein: 5. A pipe-shaped hollow steel having a threaded portion on its peripheral surface, which is driven into the ground by drilling a bit at the tip of a bolt and is filled with grout material from the inside of the bolt through the bit to the inside and outside thereof. In an anchor structure that allows the introduction force generated by tightening the bolt head with a nut to be transmitted to the ground, a wire rod having a grip before the hardening of the grout material is applied inside from the head to the tip of the self-drilling lock bolt. Insert, abut or connect the grip to the head end of the self-drilling lock bolt to cure and solidify the grout material, tighten the nut to the head of the self-drilling lock bolt, An anchor structure characterized by introducing a predetermined tension. 6. A pipe-shaped hollow steel having a threaded portion on its peripheral surface, which is driven into the ground by drilling a bit at the tip of a bolt and is filled with grout material from the inside of the bolt through the bit to the inside and outside thereof. In the anchor structure that allows the introduction force generated by tightening the bolt head with the nut to be transmitted to the ground, in the state where a plurality of wire rods having grips are inserted into the holes of the washers before the grout material is hardened, Inserted from the head to the tip of the perforated lock bolt, tightened until the grip comes into contact with the head end surface of the self-perforated lock bolt through the washer, cure and solidify the grout material, and self-drill An anchor structure, characterized in that a nut is tightened on the head of the lock bolt to introduce a predetermined tension to the self-drilling lock bolt. 7. The self-drilling lock bolt has a wall thickness which causes unevenness of the rope screw inside the pipe material when the pipe material is processed to form the outside rope screw. The anchor structure according to item 6.