JP6864575B2 - Tunnel ground exploration equipment and protective members - Google Patents

Description

The present invention relates to a technique for exploring the ground in front of the face of a tunnel.

As a technique for exploring the ground in front of the face of the tunnel, the ground in front of the face is drilled with a drill jumbo, various data output from the drilling machine, the properties of the chestnut powder contained in the return water of the drilled water, A method of collecting information such as the state of spring water and an image of a tunnel wall and grasping the properties of the ground in front of the face based on this information is known (for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 9-317372

In the ground exploration in front of the face using a drill jumbo, the return water containing the chestnut powder generated in front of the bit flows toward the face, but the return water contacts the hole wall behind the bit, so the hole behind the bit There is a risk that soil particles from the ground will return from the wall and mix with the water. In that case, the collected return water will contain a mixture of dust particles in front of the bit and soil particles in the ground behind the bit, so it is necessary to accurately grasp the properties of the ground according to the position in the tunnel excavation direction. Can't be done.

In view of the above circumstances, the present invention provides a technique for preventing soil particles and the like in the ground behind the bit from being mixed in the return water in the ground exploration in front of the face using a drill jumbo.

The present invention is used for tunnel ground exploration in front of the face, and is connected to a bit connected to the tip of a rod of a drill jumbo and a bit arranged behind the bit so as to be slidable in the circumferential direction with respect to the bit. A non-flexible relay tube and a flexible tube that is arranged behind the relay tube, is connected to the relay tube, and is deformed into a tubular shape so as to surround the rod in a region extending from the connection position to the face. A tunnel ground exploration device provided with a protective sheet of the above is proposed as the first aspect.
In the tunnel ground exploration device of the first aspect, the device is arranged behind the bit, slidably connected to the bit in the circumferential direction, and is a part of the total extension of the rod from the position of the connection to the rear. A non-flexible protective tube is provided, and the relay tube is arranged behind the protective tube and is slidably connected to the bit in the circumferential direction via the protective tube. It may be adopted as the second aspect.
In the tunnel ground exploration device of the first or second aspect, when the rod attached to the relay pipe and disconnected from the bit is pulled out from the hole drilled by the bit, the rod As a third aspect, a configuration may be adopted in which the protective sheet is provided with a cutting member that is pushed in the diameter direction of the relay pipe by the diameter-expanded portion of the relay tube to make a cut in the protective sheet.
In the tunnel ground exploration device of the first or second aspect, the protective sheet is connected to the relay pipe by being arranged inside the relay pipe and sandwiching the protective sheet between the relay pipe and the relay pipe. The connecting ring includes a ring, and when the rod that has been disconnected from the bit is pulled out from the hole drilled by the bit, the connecting ring is pushed backward by the enlarged diameter portion of the rod and moves. A configuration in which the connection between the relay pipe and the protective sheet is released as the connecting ring moves rearward may be adopted as the fourth aspect.
Further, the present invention has a cylindrical portion inserted into a hole to be drilled using the tunnel ground exploration apparatus according to any one of the first to fourth aspects, and a face from the rear end portion of the cylindrical portion. A protective member having a conical portion whose diameter increases toward the surface and preventing damage to the protective sheet due to contact with the tunnel ground is proposed as a fifth aspect.

According to the present invention, in the ground exploration in front of the face using a drill jumbo, it is possible to prevent soil particles and the like in the ground behind the bit from being mixed in the return water.

The figure which shows the tunnel ground exploration apparatus 10. The figure which shows the face K. FIG. 2 is a cross-sectional view taken along the line AA shown in FIG. Top view of the tunnel ground exploration device 10. A vertical sectional view showing a bit 6, a protective tube 20, and a rod 4. The vertical sectional view which shows the protection tube 20, the relay tube 30, and the protection sheet 40. The figure which shows the relay tube 30 seen from the rear side. The figure which shows the protection member 50. The vertical sectional view of the structure including the cutting member 60. A side view of the configuration including the cutting member 60 as viewed from the rear. The vertical sectional view of the structure including the cutting member 60. The vertical sectional view of the structure including the connecting ring 70. A side view of the configuration including the connecting ring 70 as viewed from the rear. A vertical cross-sectional view showing a configuration without a protective tube.

An example of a mode for carrying out the present invention will be described.
FIG. 1 is a diagram showing a tunnel ground exploration device 10. FIG. 2 is a diagram showing a face K. FIG. 3 is a cross-sectional view of the AA cross section shown in FIG. The drill jumbo 1 includes a guide cell 2, a drifter 3, a rod 4, a centerizer 5, and a bit 6. The rod 4 is centered by a centerizer 5 provided in the guide cell 2. The bit 6 is connected to the tip of the rod 4 and drills a hole in the ground toward the front of the face by the rotational force, striking force, and propulsive force given from the drifter 3 via the rod 4.

FIG. 4 is a plan view of the tunnel ground exploration device 10. The tunnel ground exploration device 10 includes a bit 6, a protective pipe 20, a relay pipe 30, a rod 4, and a protective sheet 40.

FIG. 5 is a vertical cross-sectional view showing the bit 6, the protective tube 20, and the rod 4. The protective tube 20 is arranged behind the bit 6 and is slidably connected to the bit 6 in the circumferential direction, and is inflexible so as to move rearward from the connection position and surround a part of the entire extension of the rod 4. It is a tube. The outer diameter of the protective tube is smaller than the outer diameter of the bit. Specifically, the protective pipe 20 may be any non-flexible pipe such as a steel pipe or a resin pipe. A groove 6a is formed in the circumferential direction on the outer circumference of the rear end of the bit 6, and a convex portion 21 extending in the circumferential direction is formed on the inner circumference of the front end of the protective tube 20. By fitting the convex portion 21 of the protective tube 20 into the groove 6a of the bit 6, the protective tube 20 is slidably connected to the bit 6 in the circumferential direction.

A female screw portion 6b is formed at the rear end of the bit 6. A diameter-expanded portion 4a having an enlarged outer diameter is provided at the front end of the rod 4. A male screw portion 4b corresponding to the female screw portion 6b of the bit 6 is formed on the outer circumference of the diameter expansion portion 4a, and the diameter expansion portion 4a is connected to the rear end portion of the bit 6. The drilling water is supplied to the bit 6 through the hollow portion of the rod 4 and is injected from the tip of the bit 6 via the flow path 6c inside the bit 6.

FIG. 6 is a vertical cross-sectional view showing the protective tube 20, the relay tube 30, and the protective sheet 40. FIG. 7 is a diagram showing a relay pipe 30 seen from the rear side. The relay pipe 30 is an inflexible pipe that is arranged behind the protective pipe 20 and is slidably connected to the bit 6 in the circumferential direction via the protective pipe 20. Specifically, the relay pipe 30 may be any non-flexible pipe such as a steel pipe or a resin pipe. The relay pipe 30 has a first pipe portion 31 arranged on the front side and a second pipe portion 32 arranged on the rear side. The first pipe portion 31 and the second pipe portion 32 are connected to each other via a bearing 33, and the second pipe portion 32 can slide in the circumferential direction with respect to the first pipe portion 31.

A female screw portion 22 is formed at the rear end of the protective tube 20. A male threaded portion 34 corresponding to the female threaded portion 22 of the protective tube 20 is formed at the front end of the first tube portion 31, and the front end of the first tube portion 31 is the protective tube 20. It is connected to the rear end of the.

The protective sheet 40 is a flexible sheet that is arranged behind the relay pipe 30, is connected to the relay pipe 30, and is deformed into a tubular shape so as to surround the rod 4 in the region from the connection position to the face K. is there. Specifically, the protective sheet 40 is made of a flexible material such as vinyl, and is a flat plate when no external force is applied. When an external force is applied, the protective sheet 40 is deformed into a shape corresponding to the external force, and the external force is removed. It has the property of returning to a flat plate when it is stressed.

A groove 35 in the circumferential direction is formed on the outer periphery of the second pipe portion 32. The protective sheet 40 is wound around the outer circumference of the second pipe portion 32. At this time, the protective sheet 40 is arranged so that the front end of the protective sheet 40 overlaps the groove 35, and the annular fixing member 41 is arranged on the outer circumference of the protective sheet 40. The fixing member 41 is a kind of caulking, and the protective sheet 40 is connected to the second pipe portion 32 by being pressed by the second pipe portion 32 from the outside and plastically deformed.

The width of the protective sheet 40 is wider than the peripheral length of the outer circumference of the relay pipe 30, and as shown in FIG. 4, the protective sheet 40 is arranged so that the ends of the protective sheet 40 overlap each other at the top end. The protective sheet 40 is deformed into a tubular shape along the hole wall in the hole.

The protective sheet 40 is preferably colorless and transparent. By photographing the hole wall covered with the colorless and transparent protective sheet 40 using an imaging means such as a fiberscope, the hole wall can be observed.

FIG. 8 is a diagram showing a protective member 50. (A) is a front view. (B) is a side view. The protective member 50 includes a cylindrical portion 51 inserted into the hole to be drilled, and a conical portion 52 whose diameter increases from the rear end portion of the cylindrical portion 51 toward the face K, and is in contact with the tunnel ground. Prevents damage to the protective sheet due to.

According to the present embodiment, since the return water path is formed by the flexible protective sheet having a tubular shape in the hole, it is possible to prevent soil particles and the like from the ground behind the bit from being mixed into the return water. Can be done. Further, since the relay pipe to which the protective sheet is connected is slidably connected to the bit in the circumferential direction via the protective pipe, the protective sheet and the relay pipe do not interfere with the driving of the bit.

The above embodiment may be modified as follows. Moreover, a plurality of variants may be combined.

[Modification 1]
9 and 11 are vertical cross-sectional views of a configuration including the cutting member 60. FIG. 10 is a side view of the configuration including the cutting member 60 as viewed from the rear. The cutting member 60 is attached to the relay pipe 30, and when the rod 4 which is disconnected from the bit 6 is pulled out from the hole drilled by the bit 6, the diameter-expanded portion 4a of the rod 4 causes the relay pipe 30 to be pulled out. It is pushed in the radial direction to make a cut in the protective sheet 40. Specifically, the cutting member 60 is attached to the rear end of the second pipe portion 32 of the relay pipe 30, and is a spring so as to maintain the posture shown in FIG. 9 when no external force is applied. Force is working. At this time, the tip of the cutting member 60 is in a position where it does not come into contact with the protective sheet 40.

When the rod 4 is pulled out, the enlarged diameter portion 4a of the rod 4 pushes the cutting member 60 backward to rotate the cutting member 60 (see FIG. 11), and the tip of the cutting member 60 is pressed against the protective sheet 40. There is a cut in the protective sheet 40. As shown in FIG. 10, since a plurality of cutting member 60 members are arranged in the circumferential direction, the protective sheet 40 has a plurality of cuts in the circumferential direction. By pulling the protective sheet 40 having a plurality of cuts backward using a heavy machine or the like, the protective sheet 40 is torn off at the positions of the cuts.

[Modification 2]
FIG. 12 is a vertical cross-sectional view of the configuration including the connecting ring 70. FIG. 13 is a side view of the configuration including the connecting ring 70 as viewed from the rear. The connecting ring 70 is arranged inside the relay pipe 30, and connects the protective sheet 40 to the relay pipe 30 by sandwiching the protective sheet 40 with the relay pipe 30. Specifically, the protective sheet 40 is inserted inside the second pipe portion 32 of the relay pipe 30 to form a tubular shape. The connecting ring 70 is, for example, an annular member in which a part of the ring is missing. When no external force is acting, the outer diameter of the connecting ring 70 is larger than the inner diameter of the second pipe portion 32. When the connecting ring 70 compressed so as to shrink in diameter is inserted inside the second pipe portion 32 covered with the protective sheet 40 and the external force is removed from the connecting ring 70, the outer peripheral surface of the connecting ring 70 presses the protective sheet 40. It is pressed against the inner surface of the second pipe portion 32 through the pipe. In this way, the protective sheet 40 is connected to the relay pipe 30.

When the protective sheet 40 is connected to the relay pipe 30, the inner diameter of the connecting ring 70 is smaller than the outer diameter of the enlarged diameter portion 4a of the rod 4. In the connecting ring 70, when the rod 4 that has been disconnected from the bit 6 is pulled out from the hole drilled by the bit 6, the force for pulling out the rod 4 reduces the frictional resistance between the connecting ring 70 and the protective sheet 40. When it exceeds, the connecting ring 70 is pushed backward by the enlarged diameter portion 4a of the rod 4 to move, and the connecting ring 70 is pulled out from the relay pipe 30 together with the rod 4. In this way, the connection between the relay pipe 30 and the protective sheet 40 is released as the connecting ring 70 moves rearward.

[Modification 3]
FIG. 14 is a vertical cross-sectional view showing a configuration without the protective tube 20. A convex portion 36 extending in the circumferential direction is formed on the inner circumference of the front end portion of the first pipe portion 31 of the relay pipe 30. By fitting the convex portion 36 into the groove 6a of the bit 6, the relay pipe 30 is slidably connected to the bit 6 in the circumferential direction.

1 ... Drill jumbo, 2 ... Guide cell, 3 ... Drifter, 4 ... Rod, 5 ... Centerizer, 6 ... Bit, 10 ... Tunnel ground exploration device, 20 ... Protective pipe, 30 ... Relay pipe, 40 ... Protective sheet, 50 ... protective member, 60 ... cutting member, 70 ... connecting ring

Claims (5)

A bit connected to the tip of the rod of the drill jumbo, which is used for tunnel ground exploration in front of the face,
An inflexible relay tube arranged behind the bit and slidably connected to the bit in the circumferential direction.
A tunnel ground provided behind the relay pipe, connected to the relay pipe, and provided with a flexible protective sheet that is deformed into a tubular shape so as to surround the rod in the region from the connection position to the face. Exploration equipment. Provided with an inflexible protective tube located behind the bit, slidably connected to the bit in the circumferential direction, from the position of the connection to the rear and enclosing a portion of the entire extension of the rod.
The tunnel ground exploration device according to claim 1, wherein the relay pipe is arranged behind the protection pipe and is slidably connected to the bit in the circumferential direction via the protection pipe. When the rod attached to the relay pipe and disconnected from the bit is pulled out from the hole drilled by the bit, it is pushed in the diameter direction of the relay pipe by the enlarged diameter portion of the rod. The tunnel ground exploration apparatus according to claim 1 or 2, further comprising a cutting member for making a cut in the protective sheet. A connecting ring that is arranged inside the relay pipe and connects the protective sheet to the relay pipe by sandwiching the protective sheet between the relay pipe and the relay pipe is provided.
When the rod, which has been disconnected from the bit, is pulled out from the hole drilled by the bit, the connecting ring is pushed backward by the enlarged diameter portion of the rod and moves.
The tunnel ground exploration apparatus according to claim 1 or 2, wherein the connection between the relay pipe and the protective sheet is released as the connecting ring moves rearward. A cylindrical portion inserted into a hole to be drilled using the tunnel ground exploration device according to any one of claims 1 to 4.
It is provided with a conical portion that expands in diameter from the rear end of the cylindrical portion toward the face.
A protective member that prevents damage to the protective sheet due to contact with the tunnel ground.

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