JPS637500A - Self-drilling type lock bolt - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention involves fitting the tip of a bolt with a pointed tip, attaching the bolt itself to a rock drill, and drilling it as a rock drilling rod until it reaches a predetermined position. This is a self-drilling type Rockpol (K) in which grout is directly injected into the bolt and used as a rock anchor after the bolt has been drilled without being pulled out.

(Prior Art) Rock bolts are used in places where the rock is in poor condition, such as being soft, so they are reinforced by tightening them with rock bolts.

By the way, the conventional method for installing rock bolts is as described in Japanese Patent Publication No. 60-20532, after drilling a hole with a rock drill and a rock drilling rod, the rock bolt is After pulling it out, a rock bolt is inserted into the hole instead and grouting agent is injected into the hole.

(Problem to be Solved by the Invention) In the conventional rock bolt installation method described above, the hole wall is required to be self-supporting when the hole is first drilled with a rock drilling rod, but in the first place the rock bed is reinforced with the rock bolt. The rock is in poor condition, so if the rock is heavily weathered and lumpy, drilling with a rock drilling rod will cause the hole to collapse. Therefore, (1) It is difficult to pull out the rock drilling rod after drilling to a predetermined position.

(2) Even if the rock drilling rod is pulled out, the hole becomes clogged with collapsed soil, making it difficult to insert a rock bolt into the hole thereafter.

Therefore, the hole must be re-drilled until the rock bolt can be inserted into the hole, or the hole must be re-drilled with the rock drill rod at a different position.

Therefore, the work is time-consuming and the work efficiency is low.

There is a problem with this point.

(Means for Solving the Problems) Therefore, in order to solve the above problems, the present invention aims to taper the tip of a rock bolt (Al) provided with a hollow hole.
1), and a screw (2) is provided at the base, and the tapered fitting hole (4) at the center of the base side of the drill bit (3) is fitted into the tapered tip (1) of the screw (2). ) is provided with a discharge port (5) communicating with the tapered fitting hole (4).

(Function) Rockpol) (Screw the Al screw (2) to the adapter of the rock drill, and use the rock drill to lock the drill bit with the tip (3)) (By applying impact and rotation to the Al, the drill tip (3) Lock bolt with (drill with Al).

After completing the drilling to the specified position, remove the rock drill from the al.
The grouting agent is injected into the hole from the outlet (5), and the rock bolt (a) with the pointed tip (3) is fixed in the hole by the grouting agent.

(Example) To explain the structure of one embodiment of the present invention shown in the drawings, (al is a rock bolt, which is constructed by connecting three deformed reinforcing bars with hollow holes. (6) is a lock bolt. The bolt (Al tip lock bolt) is made of a deformed reinforcing bar with a hollow hole (7), the tip of which is tapered (1), and the base is provided with a trapezoidal screw (8).

(9) is a lock bolt) (al middle lock bolt,
Trapezoidal screws αυ at both ends of the deformed reinforcing bar with hollow hole α1,
α2 is provided respectively. C13 is a lock bolt (a
) base lock bolt, which is made of a deformed reinforcing bar with a hollow hole (14) and long and short trapezoidal screws (2), α9, respectively, at both ends.

(3) is a drill bit with a blade αe attached to the tip.
) is provided with a tapered fitting hole (4) on the base side, and the proximal end communicates with the tapered fitting hole (4) and the tip has a conical tip (3).
) are bored with two outlet ports (5) facing into the tip recess αη facing in opposite directions. The bet is a coupler with a screw hole. Then, the tip lock bolt (6), the intermediate lock bolt (9), and the base lock bolt (alpha) are connected to each other by the coupler plate and the alpha step to form a lock bolt (al), and the tip lock bolt (6) A self-drilling lock bolt is constructed by fitting the drill point (3) into the hole.

(bl is a shank adapter with a hollow hole (19) for a rock drill. A screw hole (■) is provided in the center of the tip surface, and a screw escape recess (211) is formed in the deep part of the screw hole shank. A tool engaging part is provided on the outer peripheral surface of the part, a collar is formed in the middle part, and the base side of the collar is formed into a hexagonal columnar Q center.

(2) is a grout plug, with a center hole (2) in the center and an exhaust pipe insertion hole (2) in the upper part.

■ is a washer, and a vertically long hole ω is connected above the center hole. l31) is an exhaust pipe, and C33 is a nut.

ω is a hard bedrock, (to) is a bedrock on the surface side of the bedrock ω, (c) is a bedrock ■, (to) is the hole drilled in (a) with a drill tip (3) is a grouting agent that is filled into the hole, and is made by mixing cement, water, additives, etc.

Next, its effect will be explained.

(1) First, as shown in Fig. 10, after fitting the tapered fitting hole (4) of the tip (3) into the tapered part (1) of the tip lock bolt (6), (6
) Screw the jackhammer adapter (bl screw hole ①) into the screw (8) of the rock drill.

Therefore, in areas where the bedrock and rice fields are dry, air is blown from the rock drill through the hollow hole of the adapter (BL) and into the hollow hole of the tip rock bolt (6).
5) On the other hand, in the place where the bedrock is wet, water is supplied into the hollow hole of the tip rock bolt (6) in the same way as above, and the water is ejected from the outlet (5). Make it squirt.

After that, press the tip (3) against the desired location on the surface of the rock sample and start operating the rock drill.
A blow and rotation are applied to the tip lock bolt (6) with a cone point (3) by the bl, and the tip lock bolt (6) with a cone tip (3) makes a hole.

(Ill) When the tip of the rock bolt (6) entered the bedrock @ Tauchi, the jackhammer adapter (bl)
from the screw (8) of the tip lock bolt (6).

Next, as shown in Figure 2, screw one half of the coupler α into the screw (8) of the tip lock bolt (6), and attach the intermediate lock bolt (9) to the other half of the coupler α. screw(
13 and connect the lock bolts (6) and (9) with coupler αQ.

After that, operate in the same way as above (I+), screw the rock drill adapter (BL) onto the screw (1υ) of the middle rock bolt (9), and start operating the rock drill. Drill the holes using the attached lock bolts (6) and (9).

Plate The rock bolts (6) and (9) are bedrock (b), ω
Once inside, operate in the same manner as described above (III), remove the rock drill adapter (bl) from the screw αυ of the intermediate rock bolt (9), and then connect the intermediate rock bolt (9) and the base rock bolt α. Screw both halves of coupler U onto the national screws (11) and the lock bolts (9).
, (1'5 are connected by coupler (18) and the tip (3)
[Al, that is, constitutes a self-drilling lock bolt. Next, when the adapter (BL) is screwed onto the screw (2) of the rock bolt (AL) and the operation of the rock drill is started, a hole is drilled using the rock bolt (AL) with the tip (3).

■ As shown in Figure 1, after drilling the hole (G) to the specified position with the lock bolt (al) with the drilled tip (3), attach the adapter (bl) to the lock bolt (the screw of the al) ( 2), then fit the center hole CO of the grout plug (2) into which the exhaust pipe C31) has been inserted through the insertion hole into the screw (2) of the lock bolt (a), and insert the grout plug into the hole (2). Press-fit into the open end of (to).

Therefore, the open grout can is supplied into the hollow hole (14) of the base rock bolt α from its base end opening, and the rock bolt (
It is passed through the hollow hole (14) of al, (Irj, (force) and injected into the hole (g) from the outlet (5) of the drill tip (3).

Then, when the grouting agent (2) starts to flow out from the exhaust pipe Gll, it means that the hole (to) is filled with the grouting agent (2), so the injection operation of the grouting agent (2) is stopped.

Therefore, the grouting agent ω in the hole hardens by adhering to the outer circumferential surface of the hole 4 wall and the rock bolt with the tip (3) (at is the grout). Firmly and integrally fixed to the hard rock field through the open field.

Therefore, after that, insert the center hole of the washer □□□ into the drill tip (3).
After fitting the lock bolt (Al screw (2) and the vertical hole ω to the exhaust pipe C311 and applying the washer Q8) to the end face of the rock machining, screw the nut (32 to the screw (2)). When firmly tightened, the rock (2) is fastened to the hard rock (2) via the washer (2), nut (2), rock bolt (al) and grout opening.

In addition, rockpol) (al is instead of connecting the three deformed reinforcing bars mentioned above, connect any number of deformed reinforcing bars, or form it into a single piece, and fit the drill point (3) to it. Even if the self-drilling lock bolt is constructed using the same method, it will work in the same way as above.

(Effects of the Invention) The self-drilling rock bolt of the present invention has the following remarkable effects.

(1) Fit the tip of a rock bolt onto the tip of the rock bolt, attach the rock bolt with the tip to a rock drill, and use it as a rock drilling rod to drill holes.After drilling to the specified position is completed, Rock bolts are used as rock anchors by injecting grout into the borehole without being pulled out, and rock bolts are used for both rock drilling rods and rock anchors, so the rock bolts can be pulled out using conventional methods.
Work such as re-drilling holes is eliminated, reducing the effort and time involved and improving work efficiency.

(2) By dividing the rock bolt into several pieces and connecting them together, you can continue drilling with the rock bolt while connecting the heads of the short rock bolts, allowing construction even in very narrow spaces. can do.

(3) Form the tip of the lock bolt into a taper,
Since the taper fitting hole of the drill tip is fitted into this and the drill tip is installed with a tapered tip, the center of the lock bolt and the drill tip are accurately aligned, and the drill tip has good straightness, making smooth drilling and improving work efficiency. Get better.

(4) Since the grout is passed through the hollow hole of the rock bolt and injected into the hole from the discharge port at the tip of the rock bolt, the grout can be completely injected into the hole from the back of the hole to the opening end. be exposed.

[Brief explanation of drawings]

Fig. 1 is a vertical sectional side view of rock fastened with a self-drilling rock bolt according to an embodiment of the present invention, and Fig. 2 is an enlarged side sectional view of the same rock fastener, with the middle part cut away. show. Figure 3 is a side view with the middle part of the tip lock bolt cut away, Figure 4 is a side view with the middle part of the intermediate lock bolt cut away, and Figure 5 is a side view with the middle part of the base lock bolt cut away. Figure 6 is an enlarged side sectional view of the screw of the above tip lock bolt, Figure 7 is a side view of the tip, Figure 8 is a front view, Figure 9 is a plan view, and Figure 10 is the tip lock with the tip of the tip. It is a side sectional view of the bolt attached to the shank adapter of the rock drill, with the middle part cut away. FIG. 11 is a side view of the shank adapter, FIG. 12 is a front view, and FIG. 13 is a plan view. (al...lock bolt, (bl...adapter, (
1)...Tapered tip, (2)...Screw, (3)
... Drill tip, (4) ... Tapered fitting hole, (5) ...
・Exhaust port, (force, α0, α4・−・Hollow hole, ■・−・Screw hole, Patent applicant (044) Okabe Co., Ltd., Figure +6

Claims (1)

[Claims] The tip of the rock bolt with a hollow hole is tapered, and the base is equipped with a screw that is removably screwed into the screw hole of the rock drill adapter. A self-drilling lock bolt fitted with a tapered fitting hole, and having a discharge port communicating with the tapered fitting hole at the tip of the conical tip.