KR101000599B1 - Sealing packer for rock bolt filler, sealing method of rock bolt hole using such sealing packer, and constructing method of rock bolt - Google Patents

Abstract

PURPOSE: A sealing packer for a rock bolt filler using a foaming material, a sealing method of a rock bolt hole using such a sealing packer, and a constructing method of a rock bolt are provided to prevent a rock bolt from falling due to own weight since when the rock bolt is installed on a installation hole for installing the rock bolt after the hole is formed on the ground, the rock bolt is stably supported. CONSTITUTION: A sealing packer for a rock bolt filler using a foaming material comprises a packer body, a first foaming agent and a second foaming agent. The synthetic-resin coated aluminum foils of the front and rear sides of the packer body are thermally-bonded to form an inner space. The inner space of the packer body is divided into two areas by an inner partition line(22), which is formed by the thermal bonding. The first foaming agent and the second foaming agent are respectively filled in the two areas of the inner space of the packer body. The first and second foaming agents are mixed and form a foaming body.

Description

Sealing Packer for Rock Bolt Filler, Sealing Method of Rock Bolt Hole using such Sealing Packer, and Constructing Method of Rock Bolt}

The present invention relates to a sealing packer capable of sealing an inlet of a mounting hole provided with a lock bolt, a method for sealing a rock bolt mounting hole using the same, and a method for constructing a rock bolt, specifically, to a ground such as a ceiling surface of a tunnel. In drilling the hole for installing the bolt (hereinafter abbreviated as " mounting hole ") and filling the filler after installing the lock bolt in the mounting hole, it prevents the filler from flowing out of the mounting hole and outflowing. Rock bolt filler sealing packer using a foamable material, which is installed at the inlet of the mounting hole so that the lock bolt disposed in the mounting hole does not fall by its own weight, and seals the mounting hole. It relates to a bolt construction method.

After the tunnel is excavated, rock bolts are installed on the tunnel excavation surface, ie the rock in the tunnel, to prevent the excavation surface from relaxing. FIG. 1 is a schematic cross-sectional view illustrating a state in which a rock bolt 100 is installed in a relaxation zone of a tunnel ceiling in a tunnel excavation surface, and FIG. 2 shows a rock bolt 100 formed of a deformed reinforcement 101. A schematic diagram showing a state in which the mounting hole 200 is filled with a filler 201 such as non-contraction mortar in a state in which the mounting hole is installed is shown.

The lock bolt 100 is made of a steel bar 101 for supporting a tensile force, the nut member 103 is fastened to the end of the steel bar 101 is fixed in the fixing plate 102 placed on the ground. Although not shown in FIG. 2, if necessary, a grouting hose for injecting the filler into the mounting hole, and a portion of the filler is discharged to the outside when the filler exhausts the air in the mounting hole when the filler is injected and the filler is faithfully filled. An air hose may be further provided in the rock bolt to confirm whether the filling is faithful. The grouting hose and the air hose are components that can be omitted if necessary. In the following description, a deformed steel bar is used as the steel bar for convenience, and the prior art and the present invention will be described by illustrating a rock bolt further provided with a grouting hose and an air hose.

In order to install the rock bolts, the drilling equipment is drilled to form rock bolt mounting holes by using a drill machine. When the mounting holes are drilled, the rock bolts made of deformed steel, grouting hoses, and air hoses are placed in the mounting holes, and fillers such as non-shrink mortar are injected into the mounting holes to fill the insides of the mounting holes. The rock bolt is constructed by integrating the cavities of the mounting holes with each other.

However, as shown in FIG. 1, when the rock bolt 100 is to be installed in an inclined direction upward or upward like a ceiling surface of a tunnel, the filler flows from the mounting hole when the filler is injected into the mounting hole. Therefore, the member which can prevent the fall of a filler is needed. There is also a need for a method of supporting the weight of the rockbolt member so that the rockbolt member can be held in position in a mounting hole drilled upwards prior to filling the filler. Of course, after the filler is injected, the weight of the filler must also be supported until the filler is cured.

To this end, a conventional cap made of a cylindrical shape is inserted into the inlet of the mounting hole to prevent leakage of the filler. Figure 3 is a schematic perspective view of a filler leakage preventing cap 300, which was conventionally inserted into a mounting hole of a rock bolt and used to prevent leakage of a filler. Such a conventional filler leakage preventing cap is made of polyurethane and has a cylindrical shape. It consists of a statue.

On the other hand, the rock bolt mounting hole drilled by the drill rig and its hole inlet has irregular bends and shapes due to impact, rotation, or natural joint by the drill bit of the drill rig, and also causes irregular gaps. By the way, the conventional filler leakage prevention cap 300 as shown in Figure 3 is made of a polyurethane material and has elasticity, but because the shape is a cylindrical shape, as described above, the impact by the drill bit If the opening part of the mounting hole is broken or a gap occurs during the drilling of the mounting hole due to rotation or natural cutting, etc., and has a non-circular shape, Even if it is inserted into the mounting hole, there is a problem in that the hole inlet can not be closed tightly, and hence the outflow of the filler material cannot be avoided.

As shown in Figure 3, the conventional filler leakage preventing cap is formed on the outer surface of the projection 301 of the inverted shape in the insertion direction to support the self-weight of the rock bolt and the weight of the filler through such a projection structure, filler injection To resist the pressure of the city. However, as mentioned above, since the inlet of the mounting hole drilled in the ground is very weak due to impact, rotation, or natural joint by the drill bit, even if the inverted protrusion is formed as described above, the original intended function (self-support, There is a limit to improperly performing pressure resistance during charging).

The present invention was developed to overcome the limitations of the prior art as described above, and when the rock bolt is installed in the mounting hole after drilling the mounting hole for the installation of the rock bolt in the ground, the weight of the rock bolt stably The purpose is to prevent the rock bolts from falling by their own weight.

In addition, in the present invention, after the rock bolt is installed, a filler is injected into the empty space of the mounting hole to integrate the empty wall of the rock bolt and the mounting hole. The purpose of the present invention is to make it possible to effectively seal the mounting hole so that the filling material injected into the mounting hole does not leak or spill out of the mounting hole despite the broken or cracked state or the shape which is not circular.

It is another object of the present invention to stably support the self-weight of the filler before the filler filled in the mounting hole is cured and to effectively resist the injection pressure of the filler.

In the present invention, in order to achieve the above object, the inner partition line by heat bonding is formed in the packer body made of synthetic resin-coated aluminum foil of the front and rear surfaces to divide the inside of the packer body into two areas, the first area in each area The internal partition line is broken while the foaming liquid and the second foaming liquid are filled so that the first foaming liquid and the second foaming liquid contained in each region are mixed with each other. The foam formed by the foaming action according to the mixing of the first foaming liquid and the second foaming liquid in the state of being installed with the rock bolt at the inlet of the mounting hole drilled in the ground is ejected from the packer body, and is formed between the rock bolt and the cavity of the mounting hole. Provided is a rock bolt filler sealing pack using a foam material, characterized in that the filling.

In the present invention, the rock bolt filler sealing packer is wound around the outside of the rock bolt in a state in which the first and second foaming liquids contained in the respective regions are broken by breaking the inner partition line; Installing a rock bolt in which the sealing packer is wound in a mounting hole drilled in the ground to install the rock bolt, wherein the sealing packer is positioned at the inlet of the mounting hole; The foam by the mixing of the first foaming liquid and the second foaming liquid is ejected from the packer body to fill the gap between the rock bolt and the hole of the mounting hole. A sealing method is provided.

In another aspect, the present invention provides a method for constructing a rock bolt, comprising: drilling a mounting hole for installing a rock bolt in the ground; Winding the rock bolt filler sealing packer to the outside of the rock bolt while breaking the inner partition line so that the first foaming liquid and the second foaming liquid contained in each region are mixed with each other; Installing the lock bolt wound around the sealing packer in the mounting hole, but installing the sealing packer at the inlet of the mounting hole; When the foam by the mixing of the first foam and the second foam liquid is ejected from the packer main body and filled up between the reinforcing bar and the vacant wall of the mounting hole, a filler is injected into the mounting hole sealed with the foam to fill the mounting bolt. To be fixed at; And it provides a rock-bolt construction method using a filler sealing packer comprising the step of injecting and filling the filler in the mounting hole sealed with the foam.

According to the present invention, when the mounting hole for the installation of the rock bolt is drilled in the ground, when the rock bolt structural member is installed in the mounting hole, the rock bolt structural member stably supports the self-weight of the rock bolt structural member. The effect which does not fall by is exhibited.

According to the present invention, after the rock bolts are installed, fillers are injected into the empty spaces of the mounting holes to integrate the reinforcing bars of the rock bolts and the empty walls of the mounting holes. In spite of the condition, partly broken or cracked, or non-circular shape), the mounting hole can be effectively sealed so that the filler injected into the mounting hole does not leak or leak out of the mounting hole.

In addition, according to the present invention, not only the filler filled in the mounting hole can be stably supported by the weight of the filler before it is cured, but also the effect of being able to effectively resist the injection pressure of the filler is exerted.

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings. The present invention has been described with reference to the embodiments shown in the drawings, which are described as one embodiment by which the technical spirit of the present invention and its core configuration and operation are not limited.

The rock bolt filler sealing packer or sealant (hereinafter referred to as "sealing packer") using the foamable material according to the present invention is installed inside a mounting hole drilled into the ground to form a foam by installing a rock bolt. Seal the mounting holes.

4 is an exploded perspective view illustrating a state before the sealing packer 1 according to the present invention is completed by thermal bonding, and FIG. 5 is a perspective view of the completed state of the sealing packer 1 according to the present invention. It is. As shown in the drawings, the sealing packer 1 of the present invention has a structure in which the front and rear synthetic resin-coated aluminum foils 11 and 12 are thermally bonded to each other to form a space therein. A packer body (10) in which the inner space is divided into two regions by an inner dividing line (22) formed by bonding; It consists of a first foamed liquid and a second foamed liquid, each filled in two areas partitioned in the inner space of the packer body 10 to form a foam when mixed with each other. That is, the packer body 10 has a structure in which the front and rear synthetic resin-coated aluminum foils 11 and 12 are thermally bonded to each other to form an inner space, and the inner space of the packer body 10 is formed by thermal bonding. The two compartments of the packer body 10 partitioned in this manner are partitioned into two regions by the inner partition line 22, and the first foaming liquid and the second foaming liquid are respectively filled, so that the sealing packer (foaming property) according to the present invention is filled. Rock bolt filler anti-flow packer (1) using the material is made. When the first foam and the second foam is mixed with each other to form a foam having water tightness, for example, the first foam may be made of methylene diphenyl diisocyanate, and the second foam is It may be made of a resin premixed liquid. The resin premixed liquid is a product that has already been commercialized, and in general, when the weight of the polyol is 100, 0 to 4 parts by weight of water, 1 to 3 parts by weight of silicon, 0 to 5 parts by weight of catalyst, and 0 to 20 parts by weight of flame retardant And 0 to 10 parts by weight of the additive, 0 to 10 parts by weight of the crosslinking agent and 10 to 40 parts by weight of the blowing agent. (For example, 0 to 4 g of polyol, 1 to 3 g of silicone, 0 to 5 g of catalyst, 0 to 20 g of flame retardant, 0 to 10 g of additive, 0 to 10 g of crosslinking agent and 10 to 40 g of blowing agent are prepared). The composition of the resin premixed liquid used as the two foaming liquid is not limited to the above, and commercialized resin premixed liquid products of various compositions can be used.

Next, the packer body 10 forming the sealing packer 1 according to an embodiment of the present invention will be described with reference to FIGS. 6 to 10. 6 is a schematic plan view showing a heat bond line forming structure and an internal configuration of a packer body 10 according to the present invention. 7 and 8 are photographs before heat bonding of the synthetic resin coated aluminum foils 11 and 12 for forming the packer body 10, respectively. FIG. 9 is a photograph showing a process of thermally bonding the synthetic resin coated aluminum foils 11 and 12, and FIG. 10 is a photograph showing a state in which thermal bonding of the synthetic resin coated aluminum foils 11 and 12 is completed.

As shown in the figure, the packer body 10 is formed by thermally bonding edges in a state in which two sheets of synthetic resin-coated aluminum foils 11 and 12 of the front and rear face each other. The synthetic resin coated aluminum foils 11 and 12 are formed by coating polypropylene or polyethylene-based vinyl (synthetic resin) on the surface of the aluminum foil. When the foaming liquid is stored for a long time, the sheet or sheet material of general vinyl may be dissolved in the foaming liquid, and may influence light or air on the foaming liquid. Therefore, in the present invention, heat resistance, cold resistance, durability and good light Aluminum foil made of aluminum and low oxygen permeability is used for the manufacture of a packer body. Since the aluminum material is not heat-bonded, in the present invention, a vinyl (synthetic resin) coated on one surface of the aluminum foil is used. As can be seen in the figure, for example, two sheets of synthetic resin-coated aluminum foil having a size of 170 mm (width) and 120 mm (length) are overlapped with each other and heat-bonded at edges. Through this configuration, the packer body 10 in which the internal space is formed is formed.

On the other hand, in the present invention, the inner partition of the packer body 22 is formed in the packer body 10 made of the synthetic resin-coated aluminum foil, and the inner space of the packer body 22 is divided into two regions. Each of the two regions is filled with a first foaming liquid and a second foaming liquid.

As such, the inner partition line 22 is broken while the first foaming liquid and the second foaming liquid are filled in the two regions, respectively, so that the first foaming liquid and the second foaming liquid contained in the respective regions are mixed with each other. It is.

To this end, in the present invention, when forming the packer body 10 by facing two synthetic resin-coated aluminum foils and thermally bonding the edges, the joint lines 21 and the inner partition lines 22 of the edges and the thermal bonds of the foam liquid inlets are formed. Different intensity

Specifically, as shown in FIG. 6, the seam line 21 at the edge of the packer body 10 is maintained so that the foamed liquid does not leak, that is, does not rupture not only during the use of the packer body but also after use. Sealing area (area A denoted by the same pattern) and a burst area (shown with the same pattern) formed at the edge of one side and the foam formed by mixing the first and second foaming liquids mixed with each other come out of the packer body 10 Injection zone (D zone indicated by the same pattern) for injecting the first foaming liquid and the second foamed solution into each of the two zones divided by the internal partition line 22 (C zone indicated by the same pattern). Separated by.

The sealing area (A area) is thermally bonded to a strong degree so that the first and second foaming liquids do not leak, that is, they do not rupture not only during the use of the packer body 10 but also after use. As the region, for example, it can be formed by thermal bonding with a thermal bonding strength of 8. The injection region (D region) is open in the state before the first foaming liquid and the second foaming liquid are injected, and is joined and sealed after injecting the first foaming liquid and the second foaming liquid into the respective regions. In the completely sealed state, as in the sealing area (area A), the heat sealer should be thermally bonded to a strong degree so as not to rupture not only during the use of the packer body but also after use. It is heat bonded. The numerical value of "thermal bonding strength" exemplified in the present specification refers to the thermal adhesive strength indicated on the hand gluer manufactured and marketed by Brother Co., Ltd. as a reference, and bonding to each area of the edge joint line 21. Numerical values used for illustratively comparing the strengths.

On the other hand, in the edge joining line 21 of the packer body 10, a foam formed at the edge of one side and mixed with the first foaming liquid and the second foaming liquid to come out of the packer body 10 (B area) ) Is thermally bonded to a lower adhesive strength than the above-mentioned sealing region (A region) or injection region (D region), for example, thermal bonding strength of about 4.5-5. The bursting area (B area) is a foamed product that is burst by foaming pressure when foaming by the foaming liquid proceeds after the first foaming liquid and the second foaming liquid are mixed with each other and the sealing packer of the present invention is installed in the mounting hole. Is the part that comes out. Therefore, the ruptured area (B area) is bonded with a thermal adhesive strength that can be ruptured by the foam. As will be described later, the foam coming out of the packer body 10 after the rupture area is ruptured seals the mounting hole so that watertightness, self-weight support, and the like for the filler, groundwater, and the like are achieved.

The inner partition line 22 may also be formed by thermal bonding. When manufacturing and storing the sealing packer 1, two foaming liquids can be distinguished and stored, while two foaming liquids (first foaming liquid and second foaming) can be stored. When mixing the liquid), packer installers should be able to easily tear them off and bond them to have a thermal adhesive strength enough to communicate with each other. Thus, for example, it can be bonded to the heat adhesion strength of about 4.

Next, foaming liquids respectively filled in two areas divided by the inner partition line 22 of the packer body 10 will be described.

In the present invention, methylene diphenyl diisocyanate and resin premix were used as the first and second foaming liquids. The two foams are foamed when mixed with each other to form a watertight foam, and volume expansion having different characteristics occurs depending on the amount of mixing, the amount of mixing, and the restriction. In the sealed packer according to the present invention, two foamed liquids may be mixed in a volume ratio of 1: 1, which is a preferred example, and the present invention is not limited thereto. The above-mentioned first and second foaming liquids can be foamed 1 in water after mixing, and thus can be used even in areas affected by groundwater. FIG. 11 is a photograph of methylene diphenyl diisocyanate and resin premix contained in a storage container as examples of the first and second foams used in the present invention. Although methylene diphenyl diisocyanate and resin premix have been exemplified above as the first and second foaming liquids, the present invention is not limited thereto, and the first foaming liquid and the second foaming material may be used as long as they form a foam having water-tightness when mixed with each other. It can be used as a foaming liquid.

In the state in which the foamed liquid consisting of the above two liquids is contained in two divided areas of the packer body 10 according to the present invention, the inner partition line 22 is used to use the sealing packer 1 according to the present invention. When ruptured, foaming starts to occur while the first and second foaming liquids, ie, methylene diphenyl diisocyanate and resin premix, which are on both sides are mixed with each other. When mixing and foaming starts, a foam is formed and the inside of the packer body 10 expands, and the bursting area (region B) ruptures at the edge junction line 21 of the packer body 10 by the expansion pressure. Youre. In this way, the opening of the rupture zone (B zone) usually takes place about 1 minute 40 seconds to 3 minutes after the start of mixing.

  In this manner, as the rupture area (B area) ruptures at the edge junction line 21 of the packer body 10, the foam is ejected from the packer body 10. To have. Therefore, when the sealing packer 1 according to the present invention is installed in the mounting hole by winding the lock bolt as described below, the foam from the packer main body 10 is formed on the outer surface of the sealing packer 1 and the sealing packer 1. It fills tightly between the hollow walls of the mounting hole. In the state where the foam is filled with the mounting hole in the state where the lock bolt is installed, the foam is bonded to the empty wall of the mounting hole to support the weight of the rock bolt, to support the weight of the filler, and to prevent leakage of the filler. Function and support the injection pressure of the filler.

The amount of the foam liquid used in the present invention depends on the drilling diameter of the rock bolt, that is, the drilling diameter of the mounting hole. As a hole diameter of rock bolts, 40 mm, 45 mm and 50 mm are generally used. For 40 mm, 45 mm and 50 mm, for example, 19 ml and 25 ml for the first and second foams, respectively. And 30 ml are injected into the packer body, and the foam length becomes about 1 to 2 times the length of the packer body (the length of the mounting hole in the drilling direction) when the foaming liquid is mixed and foamed and ruptured. It becomes very suitable for exhibiting the functions aimed at by this invention, such as the support function of the weight of a bolt, a filler, etc., and the prevention of the leakage of a filler. That is, when the rock bolt has a hole diameter of 40 mm, the amount of each of the first and second foams contained in the packer body is preferably set to 19 ml. When the rock bolt has a hole diameter of 45 mm, it is contained in the packer body. Preferably, the amount of each of the first and second foams is set to 25 ml, and when the rock bolt has a hole diameter of 50 mm, the amount of each of the first and second foams contained in the packer body is preferably set to 30 ml. . However, the present invention is not limited thereto.

Next, a spacer 30 used when installing the rock bolt will be described. Since the drilling holes of the rock bolt by the drill equipment are generally made so that the mounting holes are circular, the spacer 30 installed inside the mounting holes is manufactured in a circular shape. FIG. 12 is a schematic perspective view of the spacer 30, and FIG. 13 is a photograph showing a state in which the lock bolt is inserted into the spacer 30. 12 and 13, the spacer 30 may be manufactured to fit not only the deformed rebar of the rock bolt, but also other members such as a grouting hose or an air hose. The spacer 30 serves to position the deformed rebar of the rock bolt installed in the mounting hole in the center of the mounting hole. Therefore, when the spacer 30 is used, the constituent members of the rock bolt are arranged at intervals in the center of the mounting hole, thereby ensuring a space in which the foam can be formed, so that the foam is evenly distributed in the cross section of the mounting hole. It can be spread and formed. The spacer 30 has a different number of installations depending on the length of the deformed bar, preferably at least two (two to three centimeters in front of the packer and an end position opposite the packer) are installed. When the length of the deformed rebar is long, the spacer may be installed at intervals of 2 m. 14 is a photograph showing the overall state of connecting the deformed reinforcing bar of the rock bolt and the grouting hose and the air hose together with the spacer 30 in installing the spacer, and FIG. 15 is about 2 for the sealing packer 1. It is a photograph showing a state in which the spacer 30 is installed at intervals of ~ 3cm.

In the present invention, the spacer 30 is formed between the sealing packer 1 and the spacer 30 when two foamed liquids of the sealing packer 1 are mixed and foamed and ejected toward the mounting hole through the rupture portion. It also serves to distribute the foam evenly in the space (2-3 cm). Since the spacer 30 may break when the rock bolt is inserted into the mounting hole, the spacer 30 is preferably made of a soft material.

Next, the rock bolt construction method using the sealing packer 1 of the present invention as described above and the sealing method of the rock bolt mounting hole according to the present invention will be described.

Figures 16 and 17 show a schematic construction cross-sectional view showing the construction state of the rock bolts constructed on the ground according to the present invention, Figure 16 shows a state that the foam is not yet formed from the sealing packer (1) FIG. 17 shows a state in which a foam is formed and the mounting hole is sealed. FIG. 18 is a photograph of the parts used to construct the rock bolt as shown in FIG. 17. 19 to 22 are photographs showing each step of constructing a rock bolt according to the present invention, respectively.

First, a step of drilling a hole for installing a lock bolt in the ground, that is, a mounting hole 300 is performed. While performing the operation of drilling the mounting hole 300, the operation of installing the spacer 30 in the rock bolt may be performed separately (Figs. 19 and 20). In this case, as illustrated in the drawing, the grouting hose 401 and the air hose 402 are also arranged side by side with the steel bar 101 made of a deformed rebar to combine with the spacer 30.

As illustrated in FIG. 21, the inner partition line 22 of the packer body 10 is crushed so that two foaming liquids (eg, methylene diphenyl diisocyanate liquid and resin premix liquid) are mixed with each other. When the sealing packer 1 is rubbed for about 10 seconds, the inner partition line 22 is broken so that the two foam liquids are evenly mixed with each other. Once the foaming liquids are mixed with each other, the outer surface of the rock bolt is wrapped with the sealing packer 1 as illustrated in FIG. 22. That is, as shown in FIG. 16, when the lock bolt is disposed in the mounting hole 300, the lock bolt is wrapped in the sealing packer 1 at the position where the lock bolt is placed at the inlet of the mounting hole 300. In the case where the grouting hose 401 and the air hose 402 are provided in the rock bolt as illustrated in the drawing, not only the steel rod 101 but also the grouting hose 401 and the air hose 402 are sealed together at the same time. Wrap in packer (1). At this time, as described above, the sealing packer 1 is wrapped and installed so that the rupture area (B area) of the sealing packer 1 faces the inner direction (ground direction) of the mounting hole 300.

After the outer surface of the rock bolt is wrapped using the sealing packer 1 in which the foaming liquid is mixed, the rock bolt is inserted into the mounting hole. Therefore, the sealing packer 1 is located at the inlet of the mounting hole, that is, the outer direction of the mounting hole. As the foaming liquid is mixed and the foam is formed, the ruptured area (B area) of the sealed packer is ruptured, and the foam comes out of the sealed packer 1. Depending on the mixing amount of the foaming liquid, foaming proceeds after approximately 2 to 3 minutes, so that the foam 15 fills the inlet of the mounting hole as shown in FIG. That is, the gap between the rock bolt and the mounting hole 300 is filled by the foam 15 ejected from the sealing packer 1 so that the empty wall of the rock bolt and the mounting hole are integrated with each other and the mounting hole 300 is sealed. . The foam hardens rapidly, so that the foam exerts rigidity at the same time as filling the mounting holes, supporting the weight of the components of the rock bolt and sealing the mounting holes. Once the formation of the foam is complete, it is desirable to check once again that the rock bolts do not move and then carry out subsequent work.

During the above process, the foam is formed from the foam liquid, that is, during the foaming time, the operation of tying the sealing packer, the rebar, grouting hose and air hose together with respect to the rock bolt to be installed in the mounting hole at the other position is performed. can do.

When the foam is formed, the filling bolt such as non-shrink mortar is filled into the mounting hole through the grouting hose 401 so that the steel bar 101 and the empty wall of the mounting hole are integrated with each other in the mounting hole, so that the rock bolt is firmly installed on the ground. .

In the present invention, the foam is formed in a state in which the sealing packer (1) made of a simple structure as described above is wound around the reinforcing bar of the rock bolt at the inlet of the mounting hole, and the foam tightly blocks the opening of the mounting hole. Have Therefore, even if a part of the inlet of the mounting hole is broken or has a gap and has an irregular shape and irregular shape, the foam penetrates into the gap and closes the mounting hole tightly according to the shape and condition of the mounting hole. The problem caused by the shape other than the circular shape can be solved, and the filling material filled in the mounting hole can be effectively prevented from flowing down or leaking.

In addition, the rock bolt and the hole of the mounting hole are firmly integrated by the foam, so that the positions of the steel rods, grouting hoses, and air hoses are not only fixed, but also the rock bolts can be stably supported so as not to fall by their own weight. It is possible to more stably support the self-weight of the filler filled in the mounting hole in the state before curing, and to effectively resist the injection pressure of the filler.

Next will be described the experiment to confirm the performance of the rock bolt construction using the seal pack according to the present invention as described above.

The inventor performed the following test. That is, in the case of using the sealing pack according to the present invention, whether each of the constituent members of the rock bolt installed in the mounting hole can be fixed, whether it can withstand the weight of the rock bolt, and after the filler is injected into the mounting hole In order to verify whether the rock bolts, including the self-weight of the filler, can withstand the weight of the rock bolt, even before the filler is cured, a test is carried out to load dead weight while the foam is formed by mounting the sealing packer according to the present invention in the rock bolt. It was.

In addition, the present inventors performed a filler injection test to verify whether the filler can withstand the injection pressure of the filler when the filler is injected into the mounting hole to prevent the leakage of the filler.

Specifically, a circular pipe made of acrylic was used as a substitute for the mounting hole, but the aperture diameters of the mounting holes were set to 40 mm, 45 mm, and 50 mm. As a steel bar of rock bolt, a deformed steel bar was used, and as a deformed bar, a D25 (nominal diameter 25.4mm) was used. In this test, a grouting hose for injecting filler into the mounting hole when installing the lock bolt. The outer diameter of aluminum is 12 mm and the inner diameter is 10 mm, and the overall length is 40 cm. A curved aluminum tube was used. Although a conventional grouting hose can be used, a grouting hose of about 5 cm longer than a conventional grouting hose was used, since the grouting hose may be blocked when the foam length becomes longer. As the air hose, an outer diameter of 6 mm and an inner diameter of 4 mm were used, and the spacer 30 described above was also used. After winding the deformed reinforcing bar, grouting hose and air hose with the sealing packer according to the present invention, a portion of the sealing packer wound was installed in the circular pipe, and a test specimen was made to form a foam from the sealing packer to fill the inside of the circular pipe. . Methylene diphenyl diisocyanate liquid and resin premix liquid were used as the first foam liquid and the second foam liquid filled in the two areas of the packer body, respectively, and the injection amount of the first foam liquid and the second foam liquid was rockbolt. The reinforcing bars, grouting hoses and air hoses of the outside were wound to the extent that they can be inserted into the circular pipes, and when the foam is formed, the length of the sealing packers, that is, the sealing packers in the longitudinal direction of the circular pipes The injection amount of the first foaming liquid and the second foaming liquid was determined to form a foam up to about twice the length.

FIG. 23 is a photograph of a weight bracket installed on a test specimen manufactured as described above, and FIG. 24 is a photograph of a load loaded by placing a weight on the weight bracket. 23 and 24, in the test specimen manufactured as described above to perform the above test items, the plate 501 is coupled to the end of the reinforcing bar of the rock bolt protruding to the lower end of the circular pipe, After coupling four support rods 502 perpendicular to the plate member 501, the loading plate member 503 was coupled to the lower end of the support rod. That is, by manufacturing a weight pedestal consisting of an upper plate 501, a lower loading plate 503, and a support rod 502 connecting the upper plate and the loading plate, the weight pedestal to the end of the deformed bar Combined. As described above, the weight support was installed, and in the state where the upper end of the circular pipe was fixed, the weight 504 was placed on the loading board as shown in FIG. In this test, the load was increased by 20 kg each using four 20 kg weights and two 10 kg weights.

It was verified whether the deformed reinforcing bars, grouting hoses and air hoses could be fixed in the state where the foam was formed in the mounting hole by the sealing packer. According to the test results of the present invention, after the sealing packer 1 was installed, Between 30 minutes and 2 minutes, the foaming action of the foam liquid is rapidly formed from the sealing packer, and foam is formed, and the rebar, grouting hose and air hose are fixed by the foam, and the end of the rebar is facing downward. Even in the state, rock bolts such as deformed bars did not fall, and the grouting hose was fixed to such an extent that the human hand did not move. As such, when the sealing packer of the present invention is used, it is confirmed that the foam is rapidly formed in a state in which the rock bolt is disposed in a vertically perforated mounting hole, such as a ceiling, to support and fix the rock bolt's own weight.

In addition, for each of the 40 mm, 45 mm, and 50 mm hole diameters of the mounting holes, three test specimens were prepared, the weight support was set up, and the weight was lifted. As a result of the increase, it was confirmed that all the test specimens remained in place without dropping even after a dead weight of 100 kg. This shows that the use of the sealing pack according to the present invention can sufficiently support the weight of the rock bolt.

In the method using the sealed packer according to the present invention, a filler injection tester was used in order to verify whether the filler can withstand the injection pressure and prevent the leakage of the filler. 25 is a photograph of the filler injection tester used in this test. Mortar was used as a filler, and Mortar S-ROTar (25 kg) of Lock Industries was used, and the mixing ratio of S-ROTar: water was 60:40.

Table 1 below shows the formulation of the mortar S-ROTar used in the test of the present invention.

Mortar was injected into the hopper for filling test, and then the grouting hose installed with the rock bolt and the mortar outlet of the mortar injection tester were connected. And mortar was injected into the circular pipe of the test specimen by applying pressure to the cylinder under the hopper of the mortar injection tester. Figure 26 is a photograph of the mortar is injected into the mortar injection tester, Figure 27 is a photograph of the mortar is injected into the circular pipe. When mortar flowed out through the air hose provided in the rock bolt, the injection of mortar was completed, and thus the injection was stopped.

According to the injection test results for the specimen according to the present invention as described above, the mortar outflow did not occur during or after the injection of the mortar for the specimen with a hole diameter of 40 mm, 45 mm and 50 mm of the mounting hole.

In addition, it was confirmed that the mortar outflow by increasing the pressure after blocking the air hose, there was no mortar outflow until the pressure of 2.5 bar, this measurement pressure is higher than the normal filler injection pressure, According to the present invention, it is confirmed that the leakage of the filler does not occur because it has stability against the filler injection pressure.

As described above, according to the present invention, even if the filler is injected into the lock bolt mounting hole, it is possible to prevent the leakage of the filler, thereby facilitating the construction and convenience of the rock bolt installation work in the field.

According to the present invention, it is possible to firmly fix the deformed rebar, grouting hose and air hose installed in the mounting hole, and prevent the deformed rebar, grouting hose and air hose from falling down by its own weight, and after the filling material is completed. Further, even if the weight of the injected filler is further applied, the members of the rock bolt do not fall by the weight of themselves, thereby increasing the safety and convenience of construction for the user. Furthermore, since the construction can be performed at a lower price than the spill prevention cap made of a urethane material, the effect of improving the construction economy is exerted.

1 is a schematic tunnel cross-sectional view showing a state in which a rock bolt is installed in the relaxation zone of the tunnel ceiling in the tunnel excavation surface.

2 is a schematic view showing a state in which a conventional rock bolt made of a deformed steel bar is filled with a filler such as non-shrinkable mortar in a mounting hole in a state where it is installed in the mounting hole.

3 is a schematic perspective view of a filler leakage preventing cap that was conventionally inserted into a mounting hole of a rock bolt and used to prevent leakage of a filler.

4 is an exploded perspective view showing a state before the sealing pack according to the present invention is completed by heat bonding.

5 is a perspective view of the completed state of the sealing pack according to the present invention.

6 is a schematic plan view showing a heat bond line forming structure and an internal configuration of a packer body according to the present invention.

7 and 8 are photographs showing the state before the thermal bonding of the synthetic resin coated aluminum foil for forming the packer body, respectively.

9 is a photograph showing a process of thermally bonding a synthetic resin coated aluminum foil.

10 is a photograph of a state in which thermal bonding of a synthetic resin coated aluminum foil is completed.

11 is a photograph of the foam liquid used in the present invention contained in a storage container.

12 is a schematic perspective view of a spacer used in the present invention.

13 is a photograph showing a state in which a spacer is inserted into a deformed rebar of a rock bolt.

14 is a photograph showing a state in which the deformed reinforcing bar of the rock bolt and the grouting hose and the air hose are connected to the spacer together, respectively.

15 is a photograph showing a state in which the spacer is installed at intervals of about 2 ~ 3 cm for the sealing pack according to the present invention.

Figure 14 is a schematic construction cross-sectional view showing the construction state of the rock bolt constructed on the ground in accordance with the present invention.

FIG. 15 is a photograph of parts used to construct a rock bolt as shown in FIG. 14.

Figure 16 is a schematic construction cross-sectional view showing a state in which the rock bolt is installed on the ground in accordance with the present invention, but the foam is not yet formed from the sealing packer.

17 is a schematic construction cross-sectional view showing a state in which a lock bolt is installed on the ground and a foam is formed from a sealing pack to seal the mounting hole according to the present invention.

FIG. 18 is a photograph of the parts used to construct the rock bolt as shown in FIG. 17.

19 to 22 are photographs showing each step of constructing a rock bolt according to the present invention, respectively, and FIGS. 19 and 20 show a step of combining a deformed reinforcing bar, grouting hose, and air hose of a rock bolt using a spacer. 21 shows a state in which the internal partition line is broken for mixing the foam liquid, and FIG. 22 is a photograph showing the sealing packer wound on the outer surface of the rock bolt.

Figure 23 is a photograph showing a state in which the weight bracket is coupled to the end of the deformed reinforcing bar of the rock bolt.

24 is a photograph of the weight on the back plate material.

25 is a photograph of the filler injection tester used in this test.

Figure 26 is a photograph of the injection of mortar to the mortar injection tester.

27 is a photograph of a state in which mortar is injected into a round pipe.

Claims (5)

The inner partition line 22 by heat bonding is formed in the packer main body 10 which consists of the synthetic resin coating aluminum foils 11 and 12 of the front and back surfaces, and divides the inside of the packer main body 10 into 2 area | regions, and each area | region The inner partition line 22 is broken while the first foaming liquid and the second foaming liquid are filled in such a manner that the first foaming liquid and the second foaming liquid contained in the respective regions are mixed with each other; A joint line 21 is formed at an edge of the packer body 10, and the joint line 21 does not rupture not only during the use of the packer body but also after use so that the first and second foaming liquids do not leak. The sealing area (area A), which is always bonded and maintained in a sealed state, is opened by the pressure of the foam by the mixing of the first and second foaming liquids mixed with each other so as to come out of the packer body 10. The first and second foams are opened before injecting the first and second foaming liquids into each of the ruptured areas (areas B) bonded to each other by the heat-bonding strength and the inner partition line 22. Injection area that is sealed after injection of the liquid and the second foaming liquid so that the first foaming liquid and the second foaming liquid do not rupture not only during the use of the packer body but also after use, and always remain in a bonded state (D area) Phrase with) It is and; When the foam is formed by the foaming action according to the mixing of the first foaming liquid and the second foaming liquid in a state of being installed with the rock bolt at the inlet of the mounting hole drilled in the ground while winding the outside of the rock bolt, The rupture zone (B zone) is ruptured and automatically opened by pressure, so that the foam is ejected from the packer body through the rupture zone (B zone) to fill the gap between the rock bolt and the cavity of the mounting hole to close the mounting hole. Rock bolt filler sealing packer using a foamable material characterized in that. delete The method of claim 1, The first foaming liquid is a methylene diphenyl diisocyanate liquid, The rock-bolt filler sealing packer, characterized in that the second foaming liquid is a resin premixed liquid. The inner partition line 22 by heat bonding is formed in the packer main body 10 which consists of the synthetic resin coating aluminum foils 11 and 12 of the front and back surfaces, and divides the inside of the packer main body 10 into 2 area | regions, and each area | region The inner partition line 22 is broken while the first foaming liquid and the second foaming liquid are filled in such a manner that the first foaming liquid and the second foaming liquid contained in the respective regions are mixed with each other; A joint line 21 is formed at an edge of the packer body 10, and the joint line 21 does not rupture not only during the use of the packer body but also after use so that the first and second foaming liquids do not leak. The sealing area (area A), which is always bonded and maintained in a sealed state, is opened by the pressure of the foam by the mixing of the first and second foaming liquids mixed with each other so as to come out of the packer body 10. The first and second foams are opened before injecting the first and second foaming liquids into each of the ruptured areas (areas B) bonded to each other by the heat-bonding strength and the inner partition line 22. Injection area that is sealed after injection of the liquid and the second foaming liquid so that the first foaming liquid and the second foaming liquid do not rupture not only during the use of the packer body but also after use, and always remain in a bonded state (D area) Phrase with) A rock bolt filler sealing packer (1), that is, the inside by breaking the lot lines 22 close to the outside of the rock bolt in a state such that the mixing of the first and second foaming liquid which was contained in each region; Inserting the rock bolt into the spacer 30 so that the rock bolt is centered in the mounting hole to secure the foam forming space; A rock bolt on which the sealing packer (1) is wound and the spacer (30) is inserted is installed in a mounting hole drilled in the ground, and the sealing packer (1) is installed at the inlet of the mounting hole; When the foam is formed by the foaming action according to the mixing of the first foaming liquid and the second foaming liquid, the bursting area (B area) is ruptured by the pressure of the foaming and is automatically opened, so that the foaming area is the bursting area ( A method for sealing a rock bolt mounting hole using a rock bolt filler seal packer, which is ejected from the packer body through a region B to fill the gap between the rock bolt and the cavity wall of the mounting hole. As a construction method of rock bolt, The inner partition line 22 by heat bonding is formed in the packer main body 10 which consists of the synthetic resin coating aluminum foils 11 and 12 of the front and back surfaces, and divides the inside of the packer main body 10 into 2 area | regions, and each area | region The inner partition line 22 is broken while the first foaming liquid and the second foaming liquid are filled in such a manner that the first foaming liquid and the second foaming liquid contained in the respective regions are mixed with each other; A joint line 21 is formed at an edge of the packer body 10, and the joint line 21 does not rupture not only during the use of the packer body but also after use so that the first and second foaming liquids do not leak. The sealing area (area A), which is always bonded and maintained in a sealed state, is opened by the pressure of the foam by the mixing of the first and second foaming liquids mixed with each other so as to come out of the packer body 10. The first and second foams are opened before injecting the first and second foaming liquids into each of the ruptured areas (areas B) bonded to each other by the heat-bonding strength and the inner partition line 22. Injection area that is sealed after injection of the liquid and the second foaming liquid so that the first foaming liquid and the second foaming liquid do not rupture not only during the use of the packer body but also after use, and always remain in a bonded state (D area) Phrase with) Winding the rock bolt filler sealing pack 1, which is broken in the inner partition line 22, in a state in which the first foaming liquid and the second foaming liquid contained in the respective regions are mixed with each other. ; Inserting the rock bolt into the spacer 30 so that the rock bolt is centered in the mounting hole to secure a foam forming space; Install the lock bolt in which the sealing packer 1 is wound and the spacer 30 is inserted into the mounting hole perforated in the ground, and the sealing packer 1 is located at the inlet of the mounting hole and the tear of the sealing packer 1 is broken. Installing the lock bolt in the mounting hole with the area facing inward of the mounting hole; And When the foam is formed by the foaming action according to the mixing of the first foaming liquid and the second foaming liquid, the bursting region (region B) is automatically ruptured and opened by the pressure of the foam, and thus the foam is opened in the bursting region ( B area is ejected from the packer main body to fill the space between the lock bolt and the hole of the mounting hole to close the mounting hole, and then the filler is injected into the mounting hole to fill the inside of the mounting hole with the filler so that the lock bolt is fixed at the mounting hole. Rockbolt construction method using a filler sealing packer, characterized in that it comprises a step.

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