JP2022189654A - Packer movement mechanism and ground reinforcement method - Google Patents

Abstract

To reliably fix a ground reinforcing pipe to the ground with a fixing material by eliminating leakage of the fixing material from a hole drilled in the ground with excellent construction efficiency.SOLUTION: A packer movement mechanism 1 comprises a ground reinforcement pipe 2 provided with a hollow portion 21 for injecting a fixing material therein, a guide body 3 comprising a front side guide pipe portion 31 and a rear side guide pipe portion 32 which are arranged at intervals in the axial direction of the ground reinforcement pipe, and externally inserted with a clearance provided on the outer circumference of the ground reinforcement pipe 2, an inflatable packer 4 that spans the front side guide pipe portion 31 and the rear side guide pipe portion 32 and is provided so as to cover the ground reinforcement pipe 2, an injection hose 5 fixed to at least the rear side guide pipe portion 32 and for injecting the injection material M1 into the packer 4. The guide body 3 moves according to the movement of the injection hose 5 in the axial direction of the ground reinforcement pipe 2.SELECTED DRAWING: Figure 1

Description

In the present invention, a sealing partition is formed on the outer circumference of a ground reinforcement pipe placed in a drilled hole, and a fixing material such as mortar is injected into the drilled hole on the back side of the sealing partition to reinforce the ground. It relates to a packer movement mechanism and a ground reinforcement construction method used when doing so.

Conventionally, in tunnel excavation work, the ground is reinforced by the post-injection fore-poling method. In the post-injection fore-poling method, as shown in FIGS. 10 and 11, the outer circumference of the arch-shaped shoring 502 near the face 501 of the natural ground 500 is used as a guide, and fixed obliquely forward from the tunnel space 503. A rock reinforcement pipe with a hollow for material injection is inserted into the drilled hole. Then, caulking is performed at the mouth of the drilled hole using a waste cloth and caulking material, fixing material is injected into the drilled hole through the rock reinforcement pipe, and the fore polling 504 composed of the rock reinforcement pipe and the anchoring material is formed. Form. Further, a rock bolt 506 is driven into the natural ground 500 from the tunnel wall 505 in the orthogonal direction.

In addition, as a prior art for such a forepolling method, in Patent Document 1, a hollow bolt provided with an easily breakable portion near the proximal end is constructed next from the inner peripheral side of the arch shoring near the face. A construction method is disclosed in which the anchoring material is injected through hollow bolts by inserting the arch shoring obliquely into the ground in front of the face so as to pass through the outer peripheral side of the arch shoring.

Japanese Patent Application Laid-Open No. 2020-125606

By the way, in the caulking work of the fore-poling method, since the shoring 502 is installed and the wire mesh 508 is installed to prevent the separation and cracking of the shotcrete 507, it is difficult for the operator to reach the hole. It is difficult to caulk in the back. That is, in order to prevent the fixing material from leaking from the opening of the drilled hole or a fragile portion in the vicinity thereof during the operation of injecting the fixing material into the drilled hole, the drilled hole is originally sealed at the portion P in FIG. Although it is ideal to inject the fixing material deeper into the hole than that, caulking is performed at the mouth because the worker's hand cannot reach it.

As in Patent Document 1, according to the method of driving the hollow bolt of the rock reinforcement pipe from the inner peripheral side (lower side) of the arch shoring near the face, caulking is required at the back of the hole from the mouth of the drilled hole. However, if this method is used, it will be necessary to remove the breakable part and fixing material located at the mouth of the hollow bolt in the next tunnel excavation, so the efficiency of construction work will be greatly reduced. .

In addition, not only fore polling, but also for injection-type rock bolt construction, for example, there is already lining concrete, but rock bolts are driven to repair structures that have a cavity between the back of the lining concrete and the natural ground. If the fixing material is injected into the hole, the injection material will flow out into the back cavity of the lining concrete unless it is sealed at the back of the drilled hole rather than at the mouth of the drilled hole, so the rock bolt cannot be fixed. Gone.

Therefore, there is a demand for a technique that eliminates the leakage of the fixing material from drilling holes in the ground and enables the ground reinforcement pipe to be firmly fixed to the ground.

The present invention is proposed in view of the above-mentioned problems, and is to eliminate the leakage of the fixing material from drilling holes in the natural ground, and to securely fix the natural ground reinforcing pipe to the natural ground with the fixing material. It is an object of the present invention to provide a packer moving mechanism and a ground reinforcement construction method that make it possible. For the sake of convenience in explaining the present invention, hereinafter, when the ground reinforcement pipe is installed in the drilled hole, the side arranged on the back side of the drilled hole will be referred to as "front" and "tip", and the mouth side of the drilled hole. The side that is placed on the back is sometimes expressed as "after".

The packer moving mechanism of the present invention includes a rock reinforcement pipe having a hollow portion for injecting a fixing material therein, a front guide pipe portion and a rear guide pipe portion spaced apart in the axial direction of the rock rock reinforcement pipe. a side guide pipe portion and a guide body that is externally inserted with a clearance provided on the outer periphery of the rock reinforcement pipe; An inflatable packer provided to cover the pipe, and an injection hose fixed to at least the rear guide pipe portion and injecting the injection material into the packer, wherein the It is characterized in that the guide body moves according to the movement of the injection hose.
According to this, by moving the injection hose, the guide body and the expandable packer are moved with respect to the rock reinforcement pipe, arranged at a desired position, and the packer is expanded at this desired position to form the sealed partition wall. be able to. That is, the packer can be easily moved and arranged at a desired position deep in the hole from the mouth of the drilled ground, and the sealing partition wall can be constructed. Therefore, it is possible to eliminate leakage of the fixing material from drilling holes in the natural ground, and to securely fix the natural ground reinforcing pipe to the natural ground. In addition, there is no need to remove the easy-to-break portion and the fixing material located at the mouth of the rock reinforcement pipe as the tunnel is excavated in Patent Document 1, and the construction work of the rock reinforcement structure is performed with excellent construction efficiency. It can be performed.

In the packer moving mechanism of the present invention, the guide body is composed of the separate front guide tube portion and the rear guide tube portion, and the injection hose is also fixed to the front guide tube portion, A notch for discharging the injection material into the packer is formed at a position between a fixing portion of the front guide tube portion and a fixing portion of the rear guide tube portion of the injection hose.
According to this, by separating the front side guide tube portion and the rear side guide tube portion, the degree of freedom of the length of the packer to be bridged, in other words, the degree of freedom of the packer that can be used is increased, and versatility is improved. . Further, the injection hose between the fixed portion of the front guide tube portion and the fixed portion of the rear guide tube portion can maintain the desired interval between the front guide tube portion and the rear guide tube portion. Further, even if the injection hose is fixed to the front guide tube portion, the notch allows the injection material to be reliably injected into the inside of the packer and the packer to be inflated.

In the packer moving mechanism of the present invention, the packer has a double structure composed of an outer peripheral base material and an inner peripheral base material, and an injection material is injected between the outer peripheral base material and the inner peripheral base material by the injection hose. It is characterized by
According to this, when the packer is inflated by injecting the injection material, the outer peripheral base material of the packer can be pressed against the peripheral wall of the drilled hole and sealed, and the inner peripheral base material can be attached to the ground reinforcement pipe. Sealing can be performed by pressing, and more reliable sealing can be performed with an inflated packer so that the fixing material does not flow out of the drilled holes.

In the packer moving mechanism of the present invention, the guide body is formed in a tubular shape by integrating the front side guide tube portion and the rear side guide tube portion, and an intermediate portion in the axial direction of the guide body is provided for injecting material distribution. is formed with a flow hole.
According to this, the number of parts can be reduced by forming a tubular guide body in which the front side guide tube portion and the rear side guide tube portion are integrated. Further, the gap between the tubular guide body and the ground reinforcement pipe can be filled with the injected injection material and sealed by the circulation hole in the intermediate portion of the guide body.

The ground reinforcement method of the present invention is a ground reinforcement method using the packer moving mechanism of the present invention, wherein the ground reinforcement pipe is arranged inside a drilled hole formed in the ground, and the injection hose is installed as described above. A first step of moving to the back side of the drilled hole and arranging the guide body and the packer at a predetermined position on the back side from the mouth of the drilled hole, and injecting the injection material into the packer from the injection hose. a second step of forming a sealing partition by the inflated packer at a predetermined position of the drilled hole; and a third step of injecting the fixing material into the inner side of the hole from the sealing partition wall.
According to this, it is possible to eliminate leakage of the fixing material from the drilled hole in the natural ground with excellent construction efficiency, and to securely fix the natural ground reinforcing pipe to the natural ground with the fixing material.

Advantageous Effects of Invention According to the present invention, it is possible to reliably fix a ground reinforcement pipe to the ground with a fixing material, with excellent construction efficiency, without leakage of the fixing material from drilling holes in the ground.

BRIEF DESCRIPTION OF THE DRAWINGS The isometric view explanatory drawing of the packer moving mechanism of 1st Embodiment by this invention. FIG. 4 is a longitudinal explanatory view of the packer moving mechanism of the first embodiment; (a) to (d) are process explanatory diagrams for explaining the process of applying fore-poling using the packer moving mechanism of the first embodiment. (a) is a vertical cross-sectional view of the packer moving mechanism of 1st Embodiment in case a rock reinforcement pipe is a rock bolt, (b) is the elements on larger scale of the same figure (a). (a) to (c) are process explanatory diagrams for explaining the process of installing a rock bolt using the packer moving mechanism of the first embodiment. FIG. 4 is a transverse explanatory view of a tunnel in which rock bolts are driven using the packer moving mechanism of the first embodiment; (a) is cross-sectional explanatory drawing of the packer moving mechanism of 2nd Embodiment by this invention, (b) is a perspective view which shows the guide body and packer in the packer moving mechanism of 2nd Embodiment. (a) is a cross-sectional explanatory view of the packer moving mechanism of the third embodiment according to the present invention, (b) is a cross-sectional explanatory view of the packer moving mechanism of the fourth embodiment according to the present invention, (c) is the fifth embodiment according to the present invention Cross-sectional explanatory drawing of the packer moving mechanism of a form. Cross-sectional explanatory drawing of the packer moving mechanism of 6th Embodiment by this invention. FIG. 11 is a vertical cross-sectional explanatory diagram of a tunnel in which a conventional fore polling is installed. Schematic cross-sectional view of a tunnel in which a conventional forepole is placed.

[Packer Moving Mechanism of First Embodiment]
As shown in FIGS. 1 and 2, the packer moving mechanism 1 of the first embodiment according to the present invention includes a rock reinforcement pipe 2 having a hollow portion 21 for injecting fixing material therein, and a rock reinforcement pipe. 2, the guide body 3 is composed of a front side guide tube portion 31 and a rear side guide tube portion 32 which are arranged with an interval in the axial direction of 2, and is externally inserted with a clearance 33 provided on the outer circumference of the rock reinforcement pipe 2; An inflatable packer 4 provided to cover the rock reinforcement pipe 2 and an injection hose 5 for injecting an injection material M1 into the packer 4 are provided. The ground reinforcement pipe 2 shown in FIGS. 1 to 3 is an injection pipe used in the fore-poling method, and an injection plug 23 to which a pressure-feeding hose from an injection pump for fixing material is connected to the rear end. is provided.

The guide body 3 in the first embodiment is composed of a front side guide tube portion 31 and a rear side guide tube portion 32 which are separate and have a short tubular shape. The inner diameter of the front guide pipe portion 31 and the inner diameter of the rear guide pipe portion 32 are formed slightly larger than the outer diameter of the rock reinforcement pipe 2 so that a clearance 33 is formed around the outer circumference of the rock reinforcement pipe 2 . is extrapolated to The front guide tube portion 31 and the rear guide tube portion 32 are fixed to the front guide tube portion 31 and the rear guide tube portion 32 and arranged between the front guide tube portion 31 and the rear guide tube portion 32. The portion of the injection hose 5 is arranged so as to maintain a predetermined interval opened in the axial direction of the rock reinforcement pipe 2 .

The packer 4 has a shape in which an inflatable loose bulging portion 42 is formed between the cylindrical portions 41, 41, and is made of a material such as cloth or synthetic resin. It is provided so as to span the side guide tube portion 32 . When the packer 4 is made of cloth, for example, both ends of the substantially cylindrical cloth are sewn along the outer circumferences of the front guide tube portion 31 and the rear guide tube portion 32, respectively, with seams 43, and dart processing is performed. When formed by applying, the packer 4 having a predetermined shape can be easily formed, which is good (see FIG. 7(b)).

The injection hose 5 is provided so as to extend in the axial direction of the rock reinforcement pipe 2 and is arranged so as to contact the outer circumference of the front guide pipe portion 31 and the outer circumference of the rear guide pipe portion 32 . An elastic fixing band 6 is fitted to the outside at the contact point between the injection hose 5 and the front guide tube portion 31 , and the injection hose 5 and the front guide tube portion 31 are fixed by tightening the fixing band 6 . Similarly, at the contact point between the injection hose 5 and the rear guide tube portion 32, the elastic fixing band 6 is fitted to the outside, and the injection hose 5 and the rear guide pipe portion 32 are fixed by tightening the fixing band 6. Fixed. The fixing of the injection hose 5, the front guide tube portion 31, and the rear guide tube portion 32 is not limited to the fixing band 6. For example, when the injection into the packer 4 is not pressurized injection, vinyl tape is used. It can be fixed.

The front end opening of the injection hose 5 is blocked by a blocking portion 51, and the front guide tube portion 31 of the injection hose 5 is fixed by the fixing band 6 and the rear guide pipe portion 32 is fixed by the fixing band 6. A notch 52 for discharging the injection material M1 into the packer 4 is cut in a V-shape at the position of . A joint 53 with a valve for injecting the injection material M1 is attached to the rear end of the injection hose 5 .

The packer moving mechanism 1 is a guide body composed of a front side guide tube portion 31 and a rear side guide tube portion 32 arranged at a predetermined interval according to the movement of the injection hose 5 in the axial direction of the rock reinforcement pipe 2. 3 and a packer 4 move relative to the rock reinforcement pipe 2, and the injection hose 5 is moved to the inner side of the drilled hole to arrange the packer 4 at the required position of the drilled hole. It is possible to inflate the packer 4 with (see FIG. 3).

Using the packer moving mechanism 1 of the first embodiment, for example, as shown in FIG. 102 and shotcrete 103 are formed, drilling holes 105 are formed in the ground 100 using the outer periphery of the arch-shaped support 102 near the face 104 as a guide (see FIG. 3(a)).

After that, using the outer periphery of the arch-shaped support 102 near the cutting face 104 as a guide, the ground reinforcement pipe 2, which is an injection pipe for forepoleing, is inserted into the drilled hole 105 formed in the ground 100 and arranged. . Then, regarding the guide body 3, the packer 4, and the injection hose 5 installed in the ground reinforcement pipe 2 before or after insertion into the drilled hole 105, the injection hose 5 is moved to the inner side of the drilled hole 105, and the guide body 3 and The packer 4 is arranged at a predetermined position behind the mouth of the drilled hole 105 (see FIGS. 3(b) and 3(c)).

Next, the injection material M1 is injected from the injection hose 5, and the injection material M1 is discharged and injected into the packer 4 from the notch 52 arranged corresponding to the bulging portion 42 to inflate the packer 4, and the hole is drilled. A sealing partition 40 is formed by the inflated packer 4 at a predetermined position 105 (see FIG. 3(c)). For the injection material M1, it is preferable to use, for example, mortar, silica resin, ultrafine particle cement milk, or the like.

After that, the fixing material M2 is injected from the fixing material injection hollow portion 21 of the ground reinforcement pipe 2, and the fixing material M2 is injected into the drilled hole 105 on the inner side of the sealed partition wall 40 of the packer 4 in the expanded state. . The injected fixing material M2 is injected and filled between the natural ground reinforcing pipe 2 and the drilled hole 105 from the discharge hole 22 near the tip of the natural mountain reinforcing pipe 2, and the natural mountain reinforcing pipe 2 and the solidified fixing material M2 are filled. The natural ground 100 is reinforced by (see FIG. 3(d)). For example, mortar, silica resin, ultrafine cement milk, or the like is preferably used as the fixing material M2, and it is preferable to use the same material as the injection material M1 because it can be used in common.

Further, using the packer moving mechanism 1 of the first embodiment, rock bolts can be installed from the inside of the lining concrete to reinforce the natural ground around the existing tunnel. In this case, for example, a self-drilling rock bolt having a discard bit 24r at the tip is used as the rock reinforcement pipe 2r having a hollow portion 21r for injecting the fixing material thereinto, and the surface side of the rock 200 is used. A sheet pile 201 and a lining concrete 202 are provided at the bottom, and a hole 204 is drilled from the surface of the lining concrete 202 toward the natural ground 200 in a structure in which a back cavity 203 is generated between the natural ground 200 and the sheet pile 201. 4 and 5(a).

Then, the guide body 3 and the packer 4 to which the injection hose 5 is attached are externally inserted into the ground reinforcement pipe 2r arranged in the drilled hole 204, and the injection hose 5 is moved to the inner side of the drilled hole 204 to move the guide body 3 and The packer 4 is arranged at a predetermined position on the far side from the mouth of the drilled hole 204 (see FIGS. 5(a) and 5(b)).

Next, the injection material M1 is injected from the injection hose 5, and the injection material M1 is discharged and injected into the packer 4 from the notch 52 arranged corresponding to the bulging portion 42 to inflate the packer 4, and the hole is drilled. A sealed partition wall 40 is formed by an inflated packer 4 at a predetermined position 204 (see FIGS. 5B and 5C). As the injection material M1, it is preferable to use the same material as the example of the fore-poling.

After that, the fixing material M2 is injected from the fixing material injection hollow portion 21r of the ground reinforcement pipe 2r, and the fixing material M2 is injected into the drilled hole 204 on the inner side of the sealing partition wall 40 of the expanded packer 4. . The injected fixing material M2 is injected and filled between the rock reinforcement pipe 2r and the drilled hole 204 from a discharge hole near the tip of the rock rock reinforcement pipe 2r (not shown), and the rock rock reinforcement pipe 2r and the solidified anchoring material M2 are filled. The natural ground 200 is reinforced with the material M2 (see FIGS. 5(c) and 6). As the fixing material M2, it is preferable to use the same material as the fore-polling example, and it is preferable to use the same material as the injection material M1 because it can be used in common.

According to the first embodiment, by moving the injection hose 5, the guide body 3 and the inflatable packer 4 are moved with respect to the rock reinforcement pipes 2 and 2r, arranged at desired positions, and the packer 4 is moved at this desired position. can be expanded to form the sealing partition 40 . That is, the packer 4 can be easily moved and placed at a desired position deep inside the drilled holes 105 and 204 of the ground 100 and 200 to form the sealing partition wall 40 . Therefore, leakage of the fixing material M2 from the drilled holes 105, 204 of the natural ground 100, 200 can be eliminated, and the natural ground reinforcing pipes 2, 2r can be reliably fixed to the natural ground 100, 200. In addition, there is no need to remove the easy-to-break part and fixing material located at the mouth of the rock reinforcement pipe during tunnel excavation. can.

In addition, by separating the front guide tube portion 31 and the rear guide tube portion 32, the degree of freedom of the length of the packer 4 to be bridged, in other words, the degree of freedom of the packer 4 that can be used is increased, and versatility is improved. Excellent. Further, the injection hose 5 between the fixing point of the front guide tube portion 31 and the fixing point of the rear guide tube portion 32 maintains the desired interval between the front guide tube portion 31 and the rear guide tube portion 32 . can do. Further, even if the injection hose 5 is fixed to the front guide tube portion 31, the notch 52 allows the injection material M1 to be reliably injected into the packer 4 and the packer 4 to be inflated.

[Packer Moving Mechanism of Second Embodiment]
As shown in FIG. 7, the packer moving mechanism 1a of the second embodiment according to the present invention includes a rock reinforcement pipe 2 (or 2r) and a separate front guide pipe portion 31, which have the same configuration as that of the first embodiment. and a rear side guide pipe portion 32, and is provided with a guide body 3 and an injection hose 5 which are externally inserted with a clearance 33 provided on the outer periphery of the rock reinforcement pipe 2. - 特許庁

Moreover, unlike the first embodiment, the packer 4a in the second embodiment has a double structure composed of an outer peripheral base material 44a and an inner peripheral base material 45a. The outer peripheral base material 44a has a shape in which an inflatable slack bulging portion 442a is formed between the cylindrical portions 441a, 441a, and is made of a material such as cloth or synthetic resin. The inner peripheral base material 45a has a cylindrical shape having an inner diameter corresponding to the outer diameter of the front guide tube portion 31 and the rear guide tube portion 32 that constitute the guide body 3, and is made of a material such as cloth or synthetic resin. It is The outer peripheral base material 44a and the inner peripheral base material 45a are provided so as to span the front guide tube portion 31 and the rear guide tube portion 32, respectively.

The injection hose 5 is arranged between the front cylindrical portion 441a of the outer peripheral base material 44a and the inner peripheral base material 45a and between the rear cylindrical part 441a of the outer peripheral base material 44a and the inner peripheral base material 45a. By tightening the fixing band 6 in the same manner as in , between the front cylindrical portion 441a of the outer peripheral base material 44a and the inner peripheral base material 45a, and between the rear cylindrical part 441a of the outer peripheral base material 44a and the inner peripheral base material 45a, respectively. sandwiched. The notch 52 of the injection hose 5 is arranged to open at a position corresponding to the bulging portion 442a of the outer peripheral substrate 44a, and the injection hose 5 and the notch 52 are arranged between the outer peripheral substrate 44a and the inner peripheral substrate 45a. The injection material M1 is injected by the discharge, and the packer 4a expands.

In addition, when the outer peripheral base material 44a and the inner peripheral base material 45a of the packer 4a are made of cloth, for example, both ends of the substantially cylindrical cloth are placed along the outer circumferences of the front guide tube portion 31 and the rear guide tube portion 32, respectively. If the outer peripheral base material 44a is formed by pinch-stitching at the seams 43 and applying darts processing, the packer 4a having a predetermined shape can be easily formed (see FIG. 7(b)). When the packer 4a is made of cloth, the material of the inner peripheral base material 45a is coarser than that of the outer peripheral base material 44a. It is also suitable to seal the space between the mountain reinforcing pipes 2 and 2r.

As with the packer moving mechanism 1 of the first embodiment, the packer moving mechanism 1a of the second embodiment can be used to reinforce the ground by forepoleing during tunnel excavation, or by constructing rock bolts during tunnel excavation. It is used when performing mountain reinforcement, but when the packing material M1 is injected to expand the packer 4a and form the sealing partition wall 40, the outer peripheral base material 44a of the packer 4a is attached to the peripheral walls of the drilled holes 105 and 204. Sealing can be achieved by pressing, and sealing can also be performed between the inner peripheral base material 45a and the natural ground reinforcing pipes 2, 2r by pressing the inner peripheral base material 45a against the natural ground reinforcing pipes 2, 2r.

According to the second embodiment, when the packer 4a is expanded by injecting the injection material M1, the outer peripheral base material 44a of the packer 4a can be pressed against the peripheral walls of the drilled holes 105 and 204 for sealing. At the same time, since the inner peripheral base material 45a can be pressed against the ground reinforcement pipes 2, 2r for sealing, more reliable sealing can be performed so that the fixing material M2 does not flow out of the drilled holes 105, 204. Moreover, the corresponding effect can be obtained from the configuration corresponding to the first embodiment.

[Packer Moving Mechanism of Third Embodiment]
As shown in FIG. 8(a), the packer moving mechanism 1b of the third embodiment according to the present invention has the same configuration as that of the first embodiment. and an inflatable packer 4 provided to cover and an injection hose 5 for injecting an injection material M1 into the packer 4. - 特許庁

Further, unlike the first embodiment, the guide body 3b in the third embodiment is a front guide tube portion 31b which is a short tubular double tube, and a front guide tube portion 31b which is separate from the short tubular double tube. and a rear guide tube portion 32b, which is a tube. The front guide tube portion 31b and the rear guide tube portion 32b are respectively composed of an inner tube 34b and an outer tube 35b having substantially the same length, and the inner diameter of the inner tube 34b is the outer diameter of the rock reinforcement pipe 2 (or 2r). , and is inserted so that a clearance 33 is generated around the outer circumference of the rock reinforcement pipe 2 (or 2r).

The inner diameter of the outer tube 35b is slightly larger than the outer diameter of the inner tube 34b so that the outer tube 35b is fitted onto the inner tube 34b. is provided with a recessed groove 351b formed so as to bulge outward and extend in the axial direction. The injection hose 5 and the closing portion 51 are fitted or adhered to the groove 351b of the front guide tube portion 31b, and the injection hose 5 is fitted and fitted to the groove 351b of the rear guide tube portion 32. or glued. In other words, in the third embodiment, the front guide pipe portion 31b and the injection hose 5 are fixed, and the rear guide pipe portion 32 and the injection hose 5 are fixed without using the fixing band 6 . The notch 52 of the injection hose 5 is arranged corresponding to the bulging portion 42 so that the packer 4 can be bulged by discharging and injecting the injection material M1 into the packer 4 .

As with the packer moving mechanism 1 of the first embodiment, the packer moving mechanism 1b of the third embodiment can be used to reinforce the ground by forepoleing during tunnel excavation or by installing rock bolts during tunnel excavation. Used for mountain reinforcement.

According to the third embodiment, a corresponding effect can be obtained from a configuration corresponding to the first embodiment.

[Packer Moving Mechanism of Fourth Embodiment]
The packer moving mechanism 1c of the fourth embodiment according to the present invention is fixed to the front guide tube portion 31 and the rear guide tube portion 32, respectively, as shown in FIG. The structure is the same as that of the first embodiment except for the configuration in which a connecting rod 36c connected to the pipe portion 32 is provided. Similarly to the packer moving mechanism 1 of the first embodiment, when the ground reinforcement is performed by forepolling during tunnel excavation. It is also used when rock bolts are used to reinforce the ground during tunnel excavation.

According to the fourth embodiment, the predetermined distance between the front guide tube portion 31 and the rear guide tube portion 32 can be maintained more reliably. Furthermore, corresponding effects can be obtained from a configuration corresponding to the first embodiment. It should be noted that the injection hose 5 used in the fourth embodiment may have an open end inside the packer 4 in place of the notch 52 (see FIG. 8), as in the fifth embodiment described below. (c)).

[Packer Moving Mechanism of Fifth Embodiment]
As shown in FIG. 8C, the packer moving mechanism 1d of the fifth embodiment according to the present invention has the same configuration as that of the first embodiment. An inflatable packer 4 and a fixing band 6 are provided so as to cover the .

A guide body 3d in the fifth embodiment is formed in a tubular shape in which a front side guide tube portion and a rear side guide tube portion are integrated. , and a rear guide pipe portion 372d are provided in order, and the front guide pipe portion 371d and the rear guide pipe portion 372d are arranged with an interval in the axial direction of the rock reinforcement pipe 2. As shown in FIG. The guide body 3d is externally inserted with a clearance 33 provided on the outer periphery of the rock reinforcement pipe 2, and a flow hole 38d for flow of the injection material is formed in the intermediate portion 373d of the guide body 3d.

The packer 4 is provided so as to span the front side guide tube portion 371d and the rear side guide tube portion 372d, and is fixed to the front side guide tube portion 371d and the rear side guide tube portion 372d by tightening the fixing band 6. . The injection hose 5d for injecting the injection material M1 into the packer 4 has a shape in which the tip opening 54d is open without the closing portion 51 and the notch 52 is not formed. It is fixed by tightening the fixing band 6 only to the portion 372d. A tip opening 54d of the injection hose 5 is arranged at a position corresponding to the bulging portion 42 of the packer 4, and the packing material M1 can be discharged and injected into the packer 4 from the tip opening 54d to expand the packer 4. It has become. Also in the fifth embodiment, the guide body 3d moves in the axial direction according to the movement of the injection hose 5d in the axial direction of the rock reinforcement pipe 2 (or 2r).

Similarly to the packer moving mechanism 1 of the first embodiment, the packer moving mechanism 1d of the fifth embodiment is also used when the ground is reinforced by forepoleing during tunnel excavation, or when rock bolts are installed during tunnel excavation. It is used for mountain reinforcement, and when the packing material M1 is injected to expand the packer 4 to form the sealing partition wall 40, the tubular guide is formed by the circulation hole 38d of the intermediate portion 373d of the guide body 4d. The gap 39d between the body 4d and the rock reinforcement pipe 2 (or 2r) can also be filled with the injected grouting material.

According to the fifth embodiment, the tubular guide body 3d in which the front guide tube portion 371d and the rear guide tube portion 372d are integrated can reduce the number of parts. Further, the gap 39d between the tubular guide body 3d and the ground reinforcement pipe 2 (or 2r) can be filled and sealed with the injected injection material M1 through the flow hole 38d of the intermediate portion 373d of the guide body 3d. can.

[Packer Moving Mechanism of Sixth Embodiment]
The packer moving mechanism 1e of the sixth embodiment according to the present invention, as shown in FIG. As in the second embodiment, a double structure packer 4e is provided which is composed of an outer peripheral base material 46e and an inner peripheral base material 47e.

The outer peripheral base material 46e of the packer 4e has a shape in which an inflatable slack bulging portion 462e is formed between the substantially cylindrical cylindrical portions 461e, 461e, and is made of a material such as cloth. The inner peripheral base material 47e is provided between the front guide pipe portion 31e, which is a cylindrical core material described later, and the natural ground reinforcement pipe 2 (or 2r), and between the rear guide pipe portion 32e, which is a cylindrical core material, and the natural ground reinforcement pipe 2 (or 2r). It has a tubular shape with a diameter capable of forming a clearance 33e with the reinforcing tube 2 (or 2r), and is made of a material such as cloth. The bulging portion 462e of the outer peripheral base material 46e has a larger diameter than the inner peripheral base material 47e and can be pressed against the peripheral wall of the drilled hole. The outer peripheral base material 46e and the inner peripheral base material 47e are provided so as to span the front side guide tube portion 31e and the rear side guide tube portion 32e, respectively.

The front guide tube portion 31e, which is a cylindrical core material, is provided between the inner peripheral base material 47e and the outer peripheral base material 46e at a position corresponding to the front cylindrical part 461e, and has a sewn portion 481e which is located inward with respect to the packer 4e and a sewn portion 481e which is located outward with respect to the packer 4e. is sewn in at the sewn portion 482e, is internally packed in a double packer, and is sandwiched between the inner peripheral base material 47e and the outer peripheral base material 46e. The rear guide tube portion 32e, which is a cylindrical core material, is formed between the inner peripheral base material 47e and the outer peripheral base material 46e at a position corresponding to the rear cylindrical part 461e, and a sewn portion 481e that is located inward with respect to the packer 4e. It is sewn in at the sewn portion 482e on the outer side, and is enclosed in a double packer and sandwiched between the inner peripheral base material 47e and the outer peripheral base material 46e. Cylindrical core materials that respectively constitute the front guide tube portion 31e and the rear guide tube portion 32e are thin tubular having an inner diameter slightly larger than the outer diameter of the ground reinforcement pipe 2 (or 2r). It is made of a material such as iron, plastic, or paper, and is formed so as to retain its cylindrical shape.

The injection hose 5 has a front end opening closed by a closing portion 51 and has a notch 52. The injection hose 5 is provided between the cylindrical portion 461e on the front side of the outer peripheral base material 46e and the inner peripheral base material 47e, and on the rear side of the outer peripheral base material 46e. is arranged between the cylindrical portion 461e and the inner peripheral base material 47e. In the tubular portion 461e on the rear side of the packer 4e, the injection hose 5 is provided so as to penetrate between the inner peripheral base material 47e and the outer peripheral base material 46e, and the outer periphery of the inserted injection hose 5 is slightly pressed. In this manner, the outer peripheral base material 47e and the inner peripheral base material 46e are sewn and fixed at the sewn portions 481e and 482e. In the tubular portion 461e on the front side of the packer 4e, the injection hose 5 is provided so as to be inserted halfway between the inner peripheral base material 47e and the outer peripheral base material 46e, and the outer circumference of the injection hose 5 in a state of being inserted halfway is The outer peripheral base material 47e and the inner peripheral base material 46e are sewn into the outer peripheral base material 47e and the inner peripheral base material 46e so as to be slightly pressed, and the injection hose 5 protrudes to the tip side at the outer sewing part 482e positioned at the extreme end. It is stopped and fixed to prevent it. Instead of the closing portion 51, the front end opening of the injection hose 5 may be sewn and closed by the sewn portion 482e located at the forefront.

The front end and the rear end of the packer 4e are closed by sewn parts 481e and 482e, respectively, to prevent the packer 4e from flowing out to the front end side and the rear end side when the injection material M1 is injected. 5 and the notch 52, the injection material M1 is injected into the packer 4e without flowing out to the outside, and the packer 4e expands. In addition, the inner peripheral base material 47e and the outer peripheral base material 46e at the front end of the front cylindrical part 461e of the packer 4e are further fixed with a vinyl tape or a fixing band, and the inner peripheral base material 47e at the rear end of the rear cylindrical part 461e of the packer 4e is fixed. It is preferable to further fix the outer peripheral base material 46e with a vinyl tape or a fixing band.

As with the packer moving mechanism 1 of the first embodiment, the packer moving mechanism 1e of the sixth embodiment moves the front guide tube portion 31e according to the movement of the injection hose 5 in the axial direction of the rock reinforcement pipe 2 (or 2r). and the rear guide pipe portion 32e can be moved, and when the ground reinforcement is performed by forepoleing during tunnel excavation, or when rock bolts are installed during tunnel excavation, etc., the ground reinforcement is performed. Used when

According to the sixth embodiment, a corresponding effect can be obtained from a configuration corresponding to the second embodiment. For the front guide tube portion 31e and the rear guide tube portion 32e, it is possible to use a cylindrical core material having a smaller outer diameter and size than those of the front guide tube portion 31a and the rear guide tube portion 32b. Accordingly, it is possible to reduce the overall diameter of the packer moving mechanism 1e in which the injection hose 5 is set and to move the packer 4e with respect to the rock reinforcement pipe 2 (or 2r) more smoothly.

[Scope of invention disclosed in this specification]
In addition to each invention, each embodiment, and each example listed as an invention, the invention disclosed in this specification can be changed to other contents disclosed in this specification to the extent applicable. What is specified, what is specified by adding other content disclosed in this specification to these contents, or these partial contents are deleted to the extent that partial effects can be obtained and general concepts Include what you specify. The invention disclosed in this specification also includes the following contents and the following further modifications.

For example, in the above-described embodiments, the example of using the packer moving mechanism 1, 1a to 1d for ground reinforcement in tunnel excavation was explained, but the packer moving mechanism of the present invention can be used for appropriate ground reinforcement within the applicable range. It is possible. In addition, the fixing of the front guide tube portion and the injection hose and the fixing of the rear guide tube portion and the injection hose in the present invention can be appropriately applied within the scope other than tightening, fitting, and bonding of the fixing band 6. is.

INDUSTRIAL APPLICABILITY The present invention can be used, for example, for ground reinforcement in tunnel excavation.

Reference Signs List 1, 1a, 1b, 1c, 1d, 1e Packer moving mechanism 2, 2r Rock reinforcement pipe 21, 21r Hollow portion 22 Discharge hole 23 Injection plug 24r Throw away bit 3, 3b, 3d Guide body 31 , 31b, 31e front guide tube portion 32, 32b, 32e rear guide tube portion 33, 33e clearance 34b inner tube 35b outer tube 351b groove 36c connecting rod 371d front guide tube portion 372d rear Side guide tube portion 373d Intermediate portion 38d Flow hole 39d Gap 4, 4a, 4e Packer 40 Sealing partition wall 41 Cylindrical portion 42 Bulging portion 43 Seam 44a Peripheral base material 441a Cylindrical portion 442a Swelling portion 45a Inner peripheral base material 46e Outer peripheral base material 461e Cylindrical part 462e Bulging part 47e Inner peripheral base material 481e, 482e Sewing part 5, 5d Injection hose 51 Closed part 52 Notch 53 Joint with valve 54d... Tip opening 6... Fixing band M1... Injection material M2... Fixing material 100... Natural ground 101... Tunnel space 102... Shoring 103... Shotcrete 104... Face 105... Drilling 200... Natural ground 201... Sheet pile 202... Lining Concrete 203 Back cavity 204 Drilling hole 500 Ground 501 Face 502 Shoring 503 Tunnel space 504 Fore polling 505 Tunnel wall 506 Rock bolt 507 Shotcrete 508 Wire mesh

Claims (5)

a rock reinforcement pipe provided with a hollow portion for injecting a fixing material therein;
a guide body composed of a front guide pipe portion and a rear guide pipe portion spaced apart from each other in the axial direction of the rock reinforcement pipe, and externally inserted with a clearance provided on the outer periphery of the rock rock reinforcement pipe;
an inflatable packer bridged between the front guide pipe portion and the rear guide pipe portion and provided so as to cover the rock reinforcement pipe;
An injection hose fixed to at least the rear guide tube portion and injecting an injection material into the packer,
A packer moving mechanism, wherein the guide body moves according to the movement of the injection hose in the axial direction of the rock reinforcement pipe. The guide body is composed of the separate front guide tube portion and the rear guide tube portion, and
The injection hose is also fixed to the front guide tube,
A notch for discharging the injection material into the packer is formed at a position between a fixing portion of the front guide tube portion and a fixing portion of the rear guide tube portion in the injection hose. The packer moving mechanism according to claim 1. The packer has a double structure composed of an outer peripheral base material and an inner peripheral base material,
3. The packer moving mechanism according to claim 1, wherein the injection hose injects the injection material between the outer peripheral base material and the inner peripheral base material. the guide body is formed in a tubular shape in which the front guide tube portion and the rear guide tube portion are integrated;
2. The packer moving mechanism according to claim 1, wherein a flow hole for flow of injection material is formed in an intermediate portion in the axial direction of the guide body. A ground reinforcement method using the packer moving mechanism according to any one of claims 1 to 4,
The rock reinforcement pipe is arranged inside the drilled hole formed in the ground, and the injection hose is moved to the inner side of the drilled hole to move the guide body and the packer to the deeper side than the mouth of the drilled hole. A first step of arranging at a predetermined position;
a second step of injecting the injection material from the injection hose into the packer and expanding it to form a sealing partition by the expanded packer at a predetermined position of the drilled hole;
and a third step of injecting the fixing material from the fixing material injection hollow portion of the ground reinforcement pipe, and injecting the fixing material into the inner side of the drilled hole from the sealing partition wall. Characteristic ground reinforcement method.

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