KR101192605B1 - Fleet fix-rock bolt fix device and construction method - Google Patents

Abstract

PURPOSE: A device for fixing a rock bolt to the inner front end of a borehole is provided to maintain a fixed state of a rock bolt fixed to the front end of a borehole by flexibly corresponding to the diameter of the borehole. CONSTITUTION: A device for fixing a rock bolt to the inner front end of a borehole comprises a tip cap(10), a fixing member(20), and a rock bolt. The tip cap has a head portion(11), a hollow body portion(12), and upper holes(14). The fixing member has outer upper protrusions(22) and inner protrusions(23). The outer upper protrusions are coupled to the upper holes of the tip cap. The inner protrusions are protruded inward between the outer upper protrusions. The rock bolt is coupled to the fixing member and has spiral inner protrusions fixed to the inner protrusions.

Description

Fleet Fix-Rock bolt Fix device and construction method

The present invention relates to a tip fixing rock bolt fixing device and a construction method thereof, and more particularly, in a tunnel construction or the like, drilling holes are formed in all walls such as slopes and rock wool to install rock bolts, In order to fix the bolt to be located in the center hole of the drilling hole and is firmly fixed in the drilling hole, it relates to a front end fixed lock bolt fixing device for fixing so as not to fall freely during upward construction.

Rock bolt construction is one of the most important auxiliary methods for the tunnel construction.In order to prevent the mortar and resin from flowing out when using mortar or resin, it is impossible to precisely install the rock bolt hole in advance. It is used to remedy the defects that cannot be precisely constructed because the shotcrete is not filled in the back of the rockbolt backing plate. , The beam forming effect, the pressure resistance effect, the ground arch forming effect, the ground improving effect, and the like, and the types of rock bolts can be divided into the classification by the mounting method and the classification by the construction method.

For example, tip-mounted (wedge, extended, tip-bonded), front-adhesive (filled, infused), mixed (enlarged + grouted, tip + routed), friction (swellex) ), The rock bolt consists of a dowel bar, a rock bolt support plate (face plate), washer, nut, and the like.

In the conventional rock bolt, as shown in FIG. 1, the bearing bolt 50 is connected to the outside of the wall 90 after inserting the rock bolt 30 by simply forming the punched hole 40 in the wall 90. And the mortar injection tube 70 and the air discharge pipe 80 are connected to the boring hole 40, and then coupled with the nut 60 to supply mortar to the mortar injection tube 70. In the lock bolt 30 was to be fixed.

However, in the conventional rock bolt construction, when the rock bolt is inserted into the drilled hole inclined to the rock slope, the inside of the drilled hole is mortared and hardened. At this time, the rock bolt inserted into the drilled hole drilled inclined downward from the slope is distal to the tip portion. In the process of hardening the mortar material with the self load and gravity inclined to the lower part of the core line of the hole, the anchoring strength between the rock bolt and the mortar material is significantly weakened, and the rock slope due to the weakening strength Shear strength also decreases, so rock bolts do not have a large resistance, causing problems such as cracking or collapse of rock, easily occurring or corrosion of deformed steel, resulting in increased secondary maintenance costs and safety problems. It happened.

In addition, the rock bolt installed inclined downward from the line of the central axis of the drilled hole is easy to bend and deform due to the pressure of the internal rock, and has a defect in safety accidents and structural safety due to poor construction. .

Since the rock bolt has a simple reinforcing bar shape, the supporting force is weak and the length of the rock bolt itself or the number of installation of the rock bolt must be increased in order to have a large resistance, and a separate fixing structure using a spring or wedge principle as the tip of the rock bolt. However, this structure is difficult to manufacture, expensive, many problems occurred because it can not be used to flexibly change according to the diameter of the rock bolt or drilling hole in the state of being integrally installed to the end of the rock bolt as standard.

Document 1. Utility Model Registration No. 0410020 (registered Feb. 22, 2006) Document 2. Patent Registration No. 0797818 (2008. 01. 18. registration) Document 3. Patent Publication No. 2011-0087745 (2011. 08. 03. published) Document 4. Patent Registration No. 0998589 (Registered Nov. 30, 2010)

Therefore, the problem of the present invention devised to solve the conventional drawbacks, the fixing member and the end cap at the end of the drilling hole to maintain a rigid fixed state to prevent the separation of the lock bolt, to flexibly cope with the diameter of the drilling hole It is an object of the present invention to provide a lock bolt fixing device to maintain a secure fixing state at the tip of the drilling hole.

Another problem of the present invention is to lock the bolt to the center of the perforation hole by the combination of the fixing member and the tip cap to prevent the sliding and falling of the lock bolt to proceed safely mortar work, The purpose of the present invention is to provide a state in which the lock bolt is firmly fixed to the center of the drilling hole after the end.

The present invention provides a rock bolt fixing device for fixing by mortar filling by inserting the rock bolt into the hole formed in the wall,

A tip cap forming a large hole at the same interval as the body portion having an inner diameter and forming a head portion at an upper side thereof;

A fixing member which is coupled to the large hole of the tip cap and protrudes an outer large protrusion, and forms an inner protrusion which protrudes inwardly between the outer large protrusions;

It is characterized in that it is made of a lock bolt fitted to the fixing member and the spiral inner projection is fixed to the inner projection.

The present invention provides a method for preparing a rock bolt and constructing it in the hole of the wall,

A tip cap and fixing member preparing step (S1) of preparing a tip cap and a fixing member to be installed into the drilled hole formed in the wall to be constructed;

Insert the fixing member into the inner diameter of the body of the tip cap so that the outer big protrusion of the fixing member protrudes outward from the large hole of the tip cap, and fix it with the tip cap that couples the outer small protrusion of the fixing member to the small hole of the tip cap. Member assembly step (S2);

A front end fixed type lock bolt assembly step (S3) of assembling the front end cap and the fixing member and then engaging the lock bolt at the lower side of the fixing member so that the inner protrusion of the fixing member is coupled to and fixed to the spiral inner protrusion of the lock bolt;

A tip fixed type lock bolt insertion step (S4) for supplying a tip cap and a lock bolt to the drill hole so that the lock bolt is positioned at the center of the drill hole while the head of the tip cap touches the tip of the drill hole;

Inserting a finishing member from the outside of the drilling hole and installing a bearing plate to connect the mortar injection pipe and the air discharge pipe, and tighten the nut to seal the drilling hole (S5);

A mortar placing step (S6) of injecting and curing mortar into the perforated hole through the mortar injection tube;

The lock bolt tensioning and fixing step (S7) for tensioning and fixing the lock bolt in the drilling hole; by performing sequentially, it is characterized in that the lock bolt is stably fixed at the center of the drilling hole.

The present invention is installed so that the upper end portion of the rock bolt can be located at the center of the front end of the drilling hole in the interior of the front end cap and the fixing member, the front end of the drilling hole in the state in which the fixing member is coupled with the front end cap In the state fixed to the end to prevent the release of the lock bolt, the lock bolt on the lower side of the perforated hole to the outer diameter of the lock bolt with a closing member to fill the mortar in the perforated hole until the hardening does not slip or fall until the work is It is very easy to provide, especially for upward construction.

According to the present invention, the lock bolt is coupled by an inner protrusion formed on the fixing member of the lock bolt fixing device, and the outer large protrusion protruding outward is formed radially so that the lock bolt can be positioned at the center of the drill hole. The anchoring action on the lock bolt to increase the pull tension and the pull friction resistance to improve the original construction purpose of the rock bolt construction, in particular to provide the effect of preventing the fall of the rock bolt during the up-construction.

1 is a cross-sectional view of the installation state for a conventional rock bolt
2A is a front view of the tip cap of the present invention.
2B is a cross-sectional view of the tip cap of the present invention.
2C is a plan view of the tip cap of the present invention.
2D is a bottom view of the tip cap of the present invention.
Figure 3a is a front sectional view of the fixing member of the present invention
Figure 3b is a side cross-sectional view of the fixing member of the present invention
Figure 3c is a plan view of the holding member of the present invention
Figure 4 is an assembled state sectional view of the front end cap and the fixing member of the present invention
Figure 5 is an assembled side cross-sectional view of the front end cap and the fixing member of the present invention
6 is an exploded perspective view of the main part of the present invention;
7 is an isolated cross-sectional view of the main part of the present invention.
8 is an assembled cross-sectional view of the main part of the present invention.
9 is a cross-sectional view of the installation state of the present invention
10 is a block diagram showing a preferred manufacturing method of the present invention

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2A is a front view of the tip cap of the present invention, FIG. 2B is a sectional view of the tip cap of the present invention, FIG. 2C is a top view of the tip cap of the present invention, and FIG. 2D is a bottom view of the tip cap of the present invention. It is shown.

The inner diameter is formed in the cylindrical body portion 12 having a hollow state at the same interval at the top hole 14 in the four directions; The upper hole 14 is formed to extend in the longitudinal direction so as to form at least two lines, the lower hole 15 is formed below the upper hole 14, and the upper side of the body portion 12 is conical to the head ( 11) is to form a tip cap 10 to protrude.

Figure 3a is a front cross-sectional view of the fixing member of the present invention, Figure 3b is a side cross-sectional view of the fixing member of the present invention, Figure 3c shows a plan view of the fixing member of the present invention.

Fixing member 20 to be coupled to the tip cap 10 is formed of SUS sheet of iron sheet or similar strength, it is preferable to perform a treatment such as heat treatment for strength reinforcement.

The fixing member 20 is formed as a cylinder (21) to meet each other at the cutout portion 25, so that the outer upper projection 22 is formed in the yarn direction at equal intervals; The outer upper projection 22 is formed so that the upper portion is connected and the lower portion is cut in three directions to form a shape projecting in the outer direction, it is formed in at least two lines.

On the lower side of the outer upper protrusion 22, the outer lower protrusion 24 is formed on both sides so as not to be separated after being fixed once.

An inner protrusion 23 formed between the outer upper protrusion 22 in the cylinder 21; The lower side of the inner protrusion 23 is connected to the cylinder 21 and is formed so that the upper portion is cut in three directions to protrude inward.

Figure 4 is an assembled state cross-sectional view of the front end cap and the fixing member of the present invention, Figure 5 is an assembled state side cross-sectional view of the front end cap and the fixing member of the present invention, Figure 6 is an exploded perspective view of the main part of the present invention, Figure 7 is a separated state cross-sectional view of the main part of the present invention, Figure 8 is an assembled state cross-sectional view of the main part of the present invention.

When the outer upper protrusion 22 is positioned in the upper hole 14 by engaging the fixing member 20 with the inner diameter at the lower side of the tip cap 10, the outer upper protrusion 22 is exposed outward from the upper hole 14. The outer lower protrusion 24 of the fixing member 20 is fixed to the lower hole 15 of the tip cap 10 so as to be integrally coupled so as not to rotate and move upward and downward.

After the front cap 10 and the fixing member 20 are combined, the lock bolt 30 consisting of the spiral protrusion 31 and the spiral inner protrusion 32 is coupled to the inner diameter of the fixing member 20 at the lower side.

The inner protrusions 23 are coupled to the spiral inner protrusions 32 of the lock bolt 30 to maintain the mutually fixed state.

9 is a cross-sectional view showing the installation state of the present invention, and forms a punched hole 40 in the wall 90, and the fixing member 20 and the end cap 10 are inserted into the front end of the lock bolt 30 is inserted. To the inner end of the drilling hole 40.

The bearing plate 50 is installed on the outside of the drilling hole 40 to connect the mortar injection pipe 70 and the air discharge pipe 80, and the nut 60 is coupled to the outside of the bearing plate 50. Installing the finishing member 41 on the inside is installed to prevent the leakage of mortar.

FIG. 10 is a block diagram showing a preferred manufacturing method of the present invention. In the method for preparing the rock bolt 30 and constructing it, the tip cap to be installed into the drilled hole 40 formed in the wall 90 to be constructed A tip cap and a fixing member preparing process (S1) for preparing the 10 and the fixing member 20;

Inserting the fixing member 20 into the inner diameter of the body portion 12 of the tip cap 10 so that the outer upper protrusion 22 of the fixing member 20 protrudes outward from the upper hole 14 of the tip cap 10. And, the front end cap and the fixing member assembly step (S2) for coupling the outer lower protrusion 24 of the fixing member 20 to the lower hole 15 of the tip cap 10;

After assembling the tip cap 10 and the fixing member 20, the locking bolt 30 is coupled to the lower side of the fixing member 20 so that the inner protrusions 23 of the fixing member 20 are formed of the lock bolt 30. A fixed end lock bolt assembly step (S3) to be coupled and fixed to the spiral inner protrusion 32;

The cap bolt 10 and the lock bolt 30 are supplied to the punch hole 40 so that the lock bolt 30 is in contact with the head 11 of the tip cap 10 at the tip of the punch hole 40. An end fixed rock bolt insertion step (S4) set to be located at the center of the drilling hole 40;

After inserting the finishing member 41 from the outside of the drilling hole 40, the bearing plate 50 is installed to connect the mortar injection pipe 70 and the air discharge pipe 80, the nut 60 is fastened by drilling A member installation step (S5) for sealing the hole 40;

A mortar placing step (S6) of injecting and curing mortar into the boring hole 40 through the mortar injection tube 70;

The lock bolt 30 is stably fixed at the center of the drill hole 40 by sequentially performing the lock bolt tensioning and fixing process S7 for tensioning and fixing the lock bolt 30 at the punch hole 40. will be.

The present invention made of such a configuration is to prepare a rock bolt 30 and to form a punched hole 40 in the wall 90, and then to construct it,

In order to install the rock bolt 30 on the wall 90 to be constructed, the drilling hole 40 is molded at a desired place and position by a rock drill, and the tip cap 10 and the fixing member to be installed in the drilling hole 40 are formed. 20) to perform the front end cap and fixing member preparation step (S1).

When the tip cap 10 and the fixing member 20 are prepared, the fixing member 20 is inserted into an inner diameter of the body portion 12 of the tip cap 10 so that the outer upper protrusion 22 of the fixing member 20 is formed. A tip cap and a fixing member which protrude outward from the upper hole 14 of the tip cap 10, and couple the outer lower protrusion 24 of the fixing member 20 to the lower hole 15 of the tip cap 10. Perform the assembly process (S2) to assemble the front cap 10 and the fixing member 20 to be integral.

After assembling the tip cap 10 and the fixing member 20, the lock bolt 30 is coupled to the lower side of the fixing member 20 to the inner end of the cap 10 to the tip of the lock bolt 30. When pushed into position, the inner protrusions 23 of the fixing member 20 are coupled to the spiral inner protrusions 32 of the lock bolt 30 to be fixed and fixed to the lock bolt 30 by performing an end lock type bolt assembly process (S3). Provides a state in which the front end cap 10 and the fixing member 20 are integrally assembled at the front end.

The tip cap 10 and the lock bolt 30 are supplied to the punch hole 40 so that the head 11 of the tip cap 10 is in contact with the tip of the punch hole 40, and the lock bolt ( The lock bolt 30 is inserted into the drilled hole 40 by inserting the lock bolt 30 into the drilled hole 40 so as to be positioned at the center of the drilled hole 40 so as to be accurately inserted into the center position.

When the tip cap 10 and the lock bolt 30 are inserted into the tip of the drilling hole 40, the outer upper projection of the fixing member 20 protruding outward from the upper hole 14 of the tip cap 10 ( 22 is inserted into the drill hole 40 and the outer diameter is inserted to be smaller, and after being inserted into the tip, the outer upper protrusion 22 is fixed by providing a state in which the wings are extended from the inner wall of the drill hole 40. By preventing the separation is fixed to the front end of the lock bolt 30, the lock bolt 30 is to be set so that it can be maintained to maintain the exact center in the drilling hole (40).

Insert the finishing member 41 from the outside of the perforation hole 40 to close and seal the mortar so as not to be discharged to the outside, and then install a bearing plate 50 to close the mortar injection pipe 70 and the air discharge pipe 80. Located inside the connection hole 40, the nut 60 is fastened so that the mortar can be supplied from the outside of the hole 40 through the member installation process (S5) for sealing the hole 40 by tightening the nut (60). .

Mortar is injected into the boring hole 40 into the mortar injection tube 70, and the mortar injected by performing the mortar pouring process (S6) for curing for a predetermined time is completely cured to insert the rock bolt 30. It is to be able to maintain a fixed state accurately.

By sequentially performing the lock bolt tensioning and fixing process S7 for tensioning and fixing the lock bolt 30 at the punching hole 40, the lock bolt 30 is stable in a state set at the center of the punching hole 40. It is to be able to easily perform the fixing operation of the lock bolt 30 through the action to secure.

According to the present invention, when the lock bolt is assembled to the inner diameter of the fixing member after inserting the tip cap and the fixing member and inserted into the drilling hole, the lock bolt is set to be positioned at the center. It is easy to mortar work, and the lock bolt is installed safely and firmly in the drilling hole.

10: tip cap 11: head
12 body portion 14 upper hole
15: lower hole 20: fixing member
21: cylinder 22: outer upper projection
23: inner projection 24: outer lower projection
25: incision 30: rock bolt
31: spiral protrusion 32: spiral inner projection
40: punched hole 50: bearing plate
60: nut 70: mortar injection tube
80: air discharge pipe 90: wall

Claims (8)

In the lock bolt fixing device for inserting the lock bolt 30 into the punched hole 40 formed in the wall 90 and fixed by mortar filling,
A tip cap 10 having an upper hole 14 formed at equal intervals in the body portion 12 having an inner diameter and a head portion 11 formed at an upper side thereof;
An outer upper protrusion 22 is formed to be coupled to the upper hole 14 of the tip cap 10 and is fixed to form an inner protrusion 23 that protrudes inwardly between the outer upper protrusions 22. The member 20;
Fit into the fixing member 20, the spiral inner projection 32 is made of a lock bolt 30 is fixed to the inner projection 23,
The tip cap 10 is formed so that the head portion 11 protrudes in a conical shape to the upper side of the body portion 12,
The fixing member 20 has an outer upper protrusion 22 protruding at equal intervals in the yarn direction and is fixed to the drilling hole 40, and an inner protrusion 23 protruding inwardly between the outer upper protrusions 22. ) To fix the lock bolt (30),
One side of the fixing member 20 is separated into the incision portion 25 is cut up and down, formed into a cylinder 21, and is made of iron plate and SUS plate is fixed to the front end fixing bolt, characterized in that to increase the strength by heat treatment Fixture.
delete delete delete delete delete delete In the method for preparing the rock bolt 30 and constructing it in the perforation hole 40 of the wall 90,
A tip cap and fixing member preparation process (S1) for preparing the tip cap 10 and the fixing member 20 to be installed into the drilling hole 40 formed in the wall 90 to be constructed;
Inserting the fixing member 20 into the inner diameter of the body portion 12 of the tip cap 10 so that the outer upper protrusion 22 of the fixing member 20 protrudes outward from the upper hole 14 of the tip cap 10. And, the front end cap and the fixing member assembly step (S2) for coupling the outer lower protrusion 24 of the fixing member 20 to the lower hole 15 of the tip cap 10;
After assembling the tip cap 10 and the fixing member 20, the locking bolt 30 is coupled to the lower side of the fixing member 20 so that the inner protrusions 23 of the fixing member 20 are formed of the lock bolt 30. A fixed end lock bolt assembly step (S3) to be coupled to and fixed to the spiral inner protrusion 32;
The cap bolt 10 and the lock bolt 30 are supplied to the punch hole 40 so that the lock bolt 30 is in contact with the head 11 of the tip cap 10 at the tip of the punch hole 40. An end fixed rock bolt insertion step (S4) set to be located at the center of the drilling hole 40;
After inserting the finishing member 41 from the outside of the drilling hole 40, the bearing plate 50 is installed to connect the mortar injection pipe 70 and the air discharge pipe 80, the nut 60 is fastened by drilling A member installation step (S5) for sealing the hole 40;
A mortar placing step (S6) of injecting and curing mortar into the boring hole 40 through the mortar injection tube 70;
By sequentially performing the lock bolt tensioning and fixing process (S7) for tensioning and fixing the lock bolt 30 in the punching hole 40, the lock bolt 30 is stably fixed at the center of the punching hole 40 Tip fixing rock bolt construction method characterized in that.

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