JP2004353359A - Construction method for burying reinforcing pipe for underground drilling, and connecting rotary adaptor for use in the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a screw clamp between a metallic pipe mouth part of a reinforcing pipe and a pipe body thereof or between a metallic pipe end and an adaptor from being ruptured by having rotation of a drilling bit transferred to the reinforcing pipe when the reinforcing pipe made of fiber-reinforced resin is buried in ground. <P>SOLUTION: The reinforcing pipe 10 made of the fiber-reinforced resin has the rotary adaptor 36 which is connected to the metallic pipe mouth part 14' at a leading end; the rotary adaptor 36 is composed of first and second adaptor sleeves 38 and 40 which are coupled together in a mutually turnable manner by a protrusion-recess coupling part 42; the adaptor sleeve 38 is connected to a casing shoe 34 by welding; and the mouth part 14' is screw-coupled to the adaptor sleeve 40. The rotation, which may be transferred to the casing shoe 34, is prevented from being transferred to the metallic pipe mouth part 14 by the rotary adaptor 36. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for embedding a reinforcing pipe for underground drilling, and a reinforcing pipe and a casing shoe used in this method, for example, when excavating a tunnel or the like, in order to stabilize the ground in front of the face of the tunnel. And a rotary adapter for connection with the
[0002]
[Prior art]
BACKGROUND ART When excavating a tunnel or the like, an injection type long front receiving method is employed for the purpose of stabilizing the ground in front of the face of the tunnel. In this method, a drilling rod is placed inside a reinforcing pipe (buried pipe or outer pipe), a drilling bit connected to the tip of the drilling rod is exposed from the tip of the reinforcing pipe, and drilled with a drill jumbo or the like. The drilling bit is applied to the drill bit through the drill rod, and the reinforcing pipe is advanced while drilling the ground while water is supplied from the rock drill through the internal hollow portion of the drill rod. After drilling the drilling water from the drilling bit to break the ground, the slime generated at that time is discharged outside from the space between the reinforcing pipe and the drilling rod, and after placing the reinforcing pipe in this way In this method, the drilling rod and the drilling bit are collected while leaving the reinforcing pipe in the ground, and a resin is injected into the remaining reinforcing pipe and solidified. The reinforcing pipe is lengthened by sequentially adding several meters of reinforcing pipe as the drilling progresses.
[0003]
In this method, it is preferable to cast the reinforcing pipe at a small elevation angle so that the reinforcing pipe is as close as possible to the steel support in front of the face, but recently, to achieve this, the reinforcing pipe was fiber-reinforced. It has been proposed to make a resin (FRP) tube and to sequentially add and reinforce the fiber-reinforced resin tube (see Patent Document 1).
[0004]
The use of this fiber-reinforced resin reinforcing pipe makes it possible to drive at a small elevation angle as compared with the case of using a steel reinforcing pipe, so that it is not necessary to widen the cross section when installing the support, and Since the reinforcing pipe is made of a fiber-reinforced resin, the reinforcing pipe portion that hinders the support work can be scraped off during the excavation.
[0005]
The fiber-reinforced resin reinforced pipe used in this method requires a metal coupling to connect a unit-length reinforced pipe with high strength if the entire length is a fiber-reinforced pipe. The diameter of the reinforcing pipe is enlarged by a cup rig, which causes resistance to advance of the reinforcing pipe to the ground due to drilling, and it is not possible to place a reinforcing pipe smoothly unless the drilling is further increased. Due to the diameter increase, a gap is generated between the embedded reinforcing pipe and the drilled hole, and the stability of the ground decreases.
[0006]
In addition, the mechanical strength of the screw connection between the reinforcing pipe and the coupling, which is made of fiber-reinforced resin, is small, and an extra part called a coupling is required. There were drawbacks that were cumbersome.
[0007]
For this reason, the present applicant has previously proposed a reinforcing pipe in which metal pipe mouths are connected to both ends of a pipe main body of a reinforcing pipe made of fiber-reinforced resin with the same diameter as the pipe main body (see Patent Document 2). .
[0008]
Since this reinforcing pipe has a screw connection portion composed of a male screw metal tube and a female screw metal tube connected in advance at both ends thereof, it is not necessary to connect the reinforcing tube by a coupling rig as in the prior art, and therefore, the reinforcing tube in a connected state is not required. Since the diameter is not expanded, the reinforcement pipe can be smoothly advanced to the ground without increasing the drilling diameter, and the reinforcement pipe is stably embedded in the drilling hole, so high strength You can assemble the shoring.
[0009]
The reinforcing tube is rotatably coupled to a drill bit attached to the tip of a drill rod via a casing shoe. As described above, the casing shoe is rotatably coupled to the drill bit, but the rotation of the drill bit is transmitted to the casing shoe by frictional resistance between the drill bit and the casing shoe. There is. Since this rotation is transmitted to the metal pipe mouth connected to the casing shoe, there is a tendency for breakage to occur between the fiber main body of the fiber reinforced resin of the reinforcing pipe and the metal pipe mouth.
[0010]
The reinforcing pipe having the metal pipe opening or the reinforcing pipe having a metallic length is directly screwed to the casing shoe, or screwed to an adapter connected to the casing shoe by welding or the like, and connected to the casing shoe. In this case, the screw between the adapter and the end of the metal pipe of the reinforcing pipe (the metal pipe opening in the case of a reinforcing pipe made of fiber reinforced resin) is transmitted to the casing shoe. May be destroyed by rotation.
[0011]
[Patent Document 1] Japanese Patent Application Laid-Open No. 2000-34882
[Patent Document 2] Japanese Patent Application No. 2003-52428
[Patent Document 3] Japanese Patent Application No. 2003-7212
[Problems to be solved by the invention]
The problem to be solved by the present invention is to bury a reinforcing pipe made of fiber reinforced resin or metal between a main body of the reinforcing pipe and a metal pipe opening (end) or between a reinforcing pipe and an adapter. It is an object of the present invention to provide a method for burying a reinforcement pipe for underground drilling, in which a reinforcement pipe can be buried while preventing breakage from occurring at a screwed portion.
[0015]
Another problem to be solved by the present invention is to bury a reinforcing pipe made of fiber-reinforced resin or metal, between a main body of the reinforcing pipe and a metal pipe mouth (end), or between the reinforcing pipe and an adapter. To provide a rotary adapter for connecting a reinforcing pipe for underground drilling and a casing shoe suitable for embedding a reinforcing pipe while preventing breakage from occurring at a screwed portion between them. .
[0016]
[Means for Solving the Problems]
A first object of the present invention is to connect a reinforcing pipe embedded in a drilling hole and a drilling rod surrounded by the reinforcing pipe and connected to a shank rod of a rock drill through a casing shoe, The reinforcing pipe and the drilling rod are operated by a rock drill and the reinforcing pipe is pushed into the ground together with the drilling rod while drilling in the ground with a drilling unit attached to the tip of the drilling rod. In the method of embedding a reinforcing pipe for underground drilling to pull out the rod from the reinforcing pipe, the end of the metal pipe of the reinforcing pipe and the casing shoe are connected so that they can rotate freely from each other, and the drilling rod is connected to the casing shoe. It is an object of the present invention to provide a method of burying a reinforcement pipe for underground drilling, wherein the rotation is transmitted while being prevented from being transmitted to an end of a metal pipe of the reinforcement pipe.
[0017]
In this first solution, the reinforcing pipe has a rotary adapter screw-connected to an end of the metal pipe, and the rotary adapter is provided with a concave-convex joint formed of internal and external concave-convex portions that mesh with each other and are complemented. A first adapter sleeve and a second adapter sleeve rotatably coupled to each other. The first adapter sleeve has at least one diameter-enlarging vertical groove at the concave / convex joint, and this vertical groove is While expanding, the outer peripheral uneven portion of the second adapter sleeve is driven into the inner peripheral uneven portion of the first adapter sleeve, and thereafter, a solvent which does not adhere the vertical groove of the first adapter sleeve to the second adapter sleeve is used. Can be welded.
[0018]
In the first means for solving the problems, when the reinforcing pipe is composed of a pipe main body made of fiber reinforced resin and a metal pipe mouth connected to an end of the pipe main body, the rotating adapter is provided with the reinforcing pipe. The metal tube mouth of the tube is screwed to this mouth as the metal tube end.
[0019]
A second problem solving means of the present invention is a rotary adapter for connecting a reinforcing pipe and a casing shoe used in a method of burying a reinforcing pipe for underground drilling according to the first problem solving means described above. A first adapter sleeve and a second adapter sleeve rotatably coupled by a concave / convex coupling portion formed from inner and outer concave / convex portions rotatably meshed and complemented, and the first adapter sleeve is a casing shoe. The second adapter sleeve is connected to the end of the metal pipe of the reinforcing pipe.
[0020]
According to this second object solving means, the first adapter sleeve has at least one vertical expanding groove at a portion corresponding to the concave / convex joint portion, and the first and second adapter sleeves have the first and second adapter sleeves. It is preferable that the concave and convex portions are engaged by the diameter expansion in the vertical groove of the adapter sleeve, and the vertical groove is closed by a welded portion using a solvent that does not adhere to the second adapter sleeve.
[0021]
In this way, when the metal pipe end of the reinforcing pipe and the casing shroud are rotatably connected to each other, even if the rotation of the drill bit is transmitted to the casing shoe due to frictional resistance, this rotation is performed. Since it is not transmitted to the end of the metal pipe, there is no breakage at the screwed portion between the fiber main body of the reinforcing pipe and the metal pipe mouth or between the reinforcing pipe and the adapter. .
[0022]
A first adapter sleeve rotatably coupled by a concave / convex joint formed of internal and external concave / convex portions in which a rotary adapter provided between the metal tube end of the reinforcing tube and the casing shoe meshes and is complemented with each other. And a second adapter sleeve, wherein the first adapter sleeve has at least one longitudinally expanding groove in the concave-convex joint, and the first and second adapter sleeves are formed of the first adapter sleeve. The concave and convex joints can be easily engaged with each other by expanding the diameter of the vertical groove, and the vertical groove of the first adapter sleeve is welded using a solvent that does not adhere to the second adapter sleeve. When closed by the portion, the welded portion does not fix the first and second adapter sleeves to each other, and the prevention of breakage of the reinforcing tube can be reliably maintained.
[0023]
BEST MODE FOR CARRYING OUT THE INVENTION
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described in detail with reference to the drawings. As shown in FIGS. It is used for placing the reinforcing pipe 10 obliquely along the upper edge 3a of the face 3 in the ground portion 2a above the cutting face 3 in order to receive the ground 2 in advance for the purpose of reinforcing the ground deep inside the pit. .
[0024]
As shown in FIG. 2, a plurality of reinforcement pipes 10 are cast side by side along the ceiling of the tunnel 1. As shown in FIG. 1, each reinforcing pipe 10 has a predetermined length by sequentially adding a plurality of steel pipe units 10A, 10B, 10C,...
[0025]
As shown in FIG. 3, the reinforcing pipe 10 is composed of a pipe main body 12 made of fiber reinforced resin and metal pipe openings 14, 14 'provided at both ends of the pipe main body. The fiber reinforced resin that is the material of the tube body 12 is typically a fiber reinforced resin such as unsaturated polyester or epoxy resin containing glass fiber, carbon fiber, or metal fiber.
[0026]
One of the metal pipe openings 14, 14 ′ is formed of a male screw metal pipe, and the other metal pipe mouth 14 ′ is formed of a female screw metal pipe. Are formed so as to complement each other except for the base, so that the adjacent reinforcing pipes 10 connect the male screw metal pipe mouth 14 of one reinforcing pipe 10 with the female screw metal mouth 14 of the other reinforcing pipe 10. To be connected to each other. The metal pipe openings 14, 14 'are made of, for example, steel.
[0027]
As shown in FIGS. 4 and 5, the male screw metal pipe mouth 14 and the female screw metal pipe mouth 14 'are formed with a small-diameter uneven portion in which unevenness appears alternately in the longitudinal direction on the outer periphery of a base (a portion having no screw). The pipe main body 12 made of fiber reinforced resin has an uneven small diameter portion 18 of the male screw metal pipe mouth portion 14 and an uneven small diameter portion 18 'of the female screw metal pipe mouth portion 14'. It is formed so as to embed the uneven surface of the small diameter portions 18 and 18 '. In the illustrated embodiment, the concave / convex small-diameter portions 18 and 18 'are formed continuously, but may be formed intermittently.
[0028]
The reinforcing pipe 10 can be manufactured, for example, as follows. A vinyl tape or the like is wound around a stainless steel hollow core (not shown) to form a release layer, and a male screw metal pipe mouth 14 and a female screw metal pipe mouth 14 ′ are fitted and connected to both ends of the hollow core. Then, a reinforcing fiber sheet (for example, a glass fiber non-woven fabric) is placed on the hollow core over the uneven small diameter portion 18 of the male screw metal tube mouth portion 14 and the uneven small diameter portion 18 'of the female screw metal tube mouth portion 14'. The sheet is impregnated with an epoxy resin or the like by application or spraying, and is wound in multiple layers to form a tube body 12 made of a resin containing a reinforcing material. Each reinforcing fiber sheet and the impregnated resin bite into the concave and convex surfaces of the concave and convex small-diameter portions 18 and 18 'of the male screw metal pipe opening 14 and the female screw metal pipe opening 14' when the sheets are wound. In this way, the fiber reinforced resin pipe body 12 is connected to the male screw metal pipe mouth 14 and the female screw metal pipe mouth 14 'while maintaining a large pull-out strength. 4 and 5, the inner diameter of the tube body 12, that is, the outer diameter of the hollow core is smaller than the inner diameters of the screw metal tube mouths 14, 14 ', and the outer surface of the hollow core has a release layer. Therefore, after forming the resin-made tube main body 12 containing the reinforcing material, the hollow core can be easily pulled out from the threaded metal tube opening 14 or 14 ′. At this time, the release layer remains on the inner surface of the pipe main body 12, but it does not hinder the driving of the reinforcing pipe 10 at all.
[0029]
As shown in FIG. 1, the reinforcing pipes 10 advance forward into the ground while successively adding, and these reinforcing pipes 10 connect the male screw of the male screw metal pipe mouth portion 14 with the immediately preceding female screw metal pipe of the reinforcing pipe 10. It is added by screwing and connecting into the female screw of the mouth part 14 '. In this case, since the reinforcing pipe 10 can be added without using a coupling, a diameter-enlarged portion due to the coupling does not occur on the outer periphery of the connected reinforcing pipe 10, and it is necessary to make a large hole. There is no. Therefore, there is no gap between the drilled hole and the reinforcing pipe, and the stability of the ground can be improved.
[0030]
In order to embed the reinforcing pipe 10 in front of the face 3, as shown in FIG. 1, a hollow drilling rod 20 connected to a shank rod 30 </ b> S of a rock drill 30 and inserted into the reinforcing pipe 10 is used. Can be As shown in FIG. 1, the drill rod 20 is formed by sequentially connecting a plurality of unit rods 20A, 20B, 20C,... The shank rod 30S of the rock drill 30 is connected to the rear end of the drilling rod 20 via a shank rod connection pulling 32.
[0031]
As shown in FIG. 6, the drilling unit 26 is connected to the tip of the drilling rod 20. The drilling unit 26 includes a drill bit 28 and a ring bit 30 each formed by casting steel or the like. ing. These drill bit 28 and ring bit 30 have carbide tips 28T and 30T embedded so as to be exposed at the tip end surfaces. The drill bit 28 has a function of drilling the central hole 2b in the rock wall of the ground 2, and the ring bit 30 has a function of expanding the diameter of the central hole 2b (see FIG. 1).
[0032]
As shown in FIG. 6, the drill bit 28 includes a bit adapter 32 having a female screw connection portion 32T to which a male screw at the tip of the drill rod 22 is coupled. The ring bit 30 is connected to the ring bit 30 by inserting and rotating into the bit 30. In this connection, the drill bit 28 rotates together with the ring bit 30 in the direction in which the drill bit 28 rotates in the drilling operation, but when the drill bit 28 rotates in the direction opposite to the rotation direction of the drilling operation, the drill bit 28 It is performed in such a manner that it can escape from the ring bit 30.
[0033]
Similarly, as shown in FIG. 6, a casing shoe 34 is rotatably fitted to the bit adapter 32, and the casing shoe 34 is attached to the metal pipe opening 14 'of the most advanced reinforcing pipe 10. As will be described later, the rotating adapter 36 has an opposite inclined surface 34C corresponding to the distal inclined surface 36C of the rotating adapter 36, and a groove formed between these inclined surfaces 36C and 34C is welded. It is connected to the reinforcing pipe 10. In FIG. 6, reference symbol W indicates a welded portion between the casing shoe 34 and the reinforcing pipe 10.
[0034]
7 and 8, the rotary adapter 36 comprises first and second adapter sleeves 38, 40 which are rotatable relative to each other but are axially coupled. The adapter sleeves 38 and 40 are connected by a concave / convex connecting portion 42 which is rotatably meshed with each other.
[0035]
More specifically, as shown in FIG. 8 (A), the first adapter sleeve 38 is provided with an annular concave portion and an annular convex portion gradually increasing in diameter in a stepwise manner toward the distal end on the inner periphery. As shown in FIG. 8 (B), the second adapter sleeve 40 has an inner peripheral uneven portion 42A corresponding to the inner peripheral uneven portion 42A of the first adapter sleeve 38. 42B. Accordingly, the rotary adapter 36 is axially connected to the first and second adapter sleeves 38 and 40 by the concave / convex connecting portion, but can freely move in the rotational direction. .
[0036]
As shown in FIGS. 9 and 10, the first adapter sleeve 38 of the rotary adapter 36 has at least one vertically extending groove in a portion having an inner peripheral uneven portion 42A (a portion corresponding to the uneven connecting portion). 38SL, in the illustrated embodiment, has two shoe expanding vertical grooves 38SL, and the second adapter sleeve 40 expands the vertical grooves 44 and moves the outer peripheral uneven portion 42B into the first adapter sleeve 38. The inner and outer concave and convex portions 42A and 42B are engaged with each other by being driven into each other, and thereafter, the vertical groove 38SL of the first adapter sleeve 38 is welded by using a solvent that does not adhere to the second adapter sleeve 40. The first and second adapter sleeves 38, 40 are rotatably connected to each other. In FIG. 7, the inner peripheral uneven portion 42A of the first adapter sleeve 38 and the outer peripheral uneven portion 42B of the second adapter sleeve 40 have a rectangular wave shape. ), These uneven portions 42A and 42B have a sawtooth shape, but in reality, one of the forms shown in FIG. 7 or FIG. 8 is used. However, in order to make it easier to drive the second adapter sleeve 40 into the first adapter sleeve 38, the concave and convex portions 42A and 42B shown in FIG. 8 are preferable.
[0037]
The tip inclined surface 36C of the rotary adapter 36 is formed at the tip of the first adapter sleeve 38, and the first adapter sleeve 38 is connected to the casing shoe 34 by welding. The outer peripheral surface of the rear end of the second adapter sleeve 40 has a male screw portion 40a to which the female screw portion of the metal pipe opening 14 'at the foremost end of the reinforcing pipe 10 is connected. The part 14 'is connected by screwing its female screw part to this male screw part 40a. In this way, the reinforcing pipe 10 is connected to the casing shoe 34 via the rotating adapter 36.
[0038]
The casing shoe 34 has a ring bit coupling portion 44 that is retained on the inner periphery of the ring bit 30 of the drilling unit 26 but is coupled to be rotatable. The ring bit coupling portion 44 is formed in the outer periphery of the casing shoe 34 and has an annular groove 46 having a substantially semicircular cross section, and is softly engaged with the annular groove 46 and prevented from falling off by the lower end inner flange 30F of the ring bit 30. Wire connecting member 48. The wire connecting member 48 is inserted into a ring through hole (not shown) of the casing shoe 34 which is opened on the outer peripheral surface of the ring bit 30 and penetrates into the inner space of the ring bit 30 and inserted into the ring bit 30. Will be involved.
[0039]
The bit adapter 32 and the casing shoe 34 have mutually engaging shoulders 32S, 34S on opposite surfaces thereof, and these shoulders 32S, 34S are connected to the bit adapter 32 by the drilling unit 26. In this state, they are engaged with each other and the pushing force from the drilling rod 20 is transmitted to the reinforcing pipe 10 via the casing shoe 34 to push the reinforcing pipe 10.
[0040]
As shown in FIG. 6, the drill bit 28 injects drilling water, which is fed from the inside of the drill rod 26 to the hollow portion 32H of the bit adapter 32, onto the rock wall on which the central hole 2b is to be drilled, thereby removing soil. It has a bifurcated water guide hole 50 for guiding it to break, and two backflow holes 52 provided close to two outlets of the water guide hole 50 for backflowing slime generated by crushing by drilling water. The backflow holes 52 communicate with the reinforcing pipe 10 via a corresponding pair of side grooves 32G (shown by dotted lines in FIG. 6) of the bit adapter 32, so that the slime is The water flows backward inside and is discharged.
[0041]
In this manner, the drill bit 28 and the ring bit 30 of the drill unit 26, as shown in FIG. 1, strike and rotate forces from the shank rod 30S of the rock drill 30 via the drill rod 20. While receiving the water, pressure water pumped through the drilling rod 20 gushes out of the water guide hole 50 of the drilling unit 26 to drill the ground portion 2a in front of the tip opening of the reinforcing pipe 10. As shown in FIG. 1, the drill 10 receives a pushing force from the bit adapter 32 connected to the drilling rod 20 via the casing shoe 34, and thus advances as the drilling unit 26 drills (perforates).
[0042]
After the reinforcing pipe 10 is driven into the ground 2 with a predetermined length, the drilling bit 28 integral with the bit adapter 32 at the tip of the drilling rod 22 is rotated together with the drilling rod 20 in the drilling operation. By rotating in the opposite direction to release the connection with the ring bit 30, the drill bit 20 is withdrawn from the reinforcing tube 10 including the ring bit 30, the casing shoe 34, and the rotating adapter 36, and the drill bit 20 is collected together with the drill bit 28. Therefore, the ring bit 30 and the casing shoe 34 of the drilling unit 26 are left underground together with the reinforcing pipe 10.
[0043]
Thereafter, an injection pipe connected via a hose to an injection machine (not shown) for injecting an injection material such as silica resin is drawn into the reinforcement pipe 10, the injection material is filled into the reinforcement pipe 10, and a part thereof is reinforced. It leaks around the reinforcing pipe 10 through a large number of discharge holes (not shown) of the pipe 10, and the inner and outer injection materials are hardened to receive the ground portion 2 a in front of the face 3.
[0044]
In the illustrated embodiment, the rotary adapter 36 is connected to the casing shoe 34 by welding. However, an external thread is formed on the outer periphery of the rear end of the casing shoe 34 so that the inner end of the first adapter sleeve 38 of the rotary adapter 36 is formed. A female screw may be formed on the circumference to connect the rotary adapter 36 and the casing shoe 34 by screw connection.
[0045]
In the illustrated embodiment, the drilling unit 26 includes a drill bit 28 connected to a bit adapter 32 and a ring bit 30 fitted to the drill bit 28. The present invention can also be applied to a configuration in which the ring bit 30 is integrated. In this case, when the drilling rod 20 is pulled out of the reinforcing pipe 10 together with the bit adapter 32 after the embedding work is completed, the entire drilling unit 26 is left underground (see Patent Document 3).
[0046]
In the above-described embodiment, the present invention is applied to a reinforcing pipe made of fiber reinforced resin having metal pipe openings at both ends, but the present invention can also be applied to a reinforcing pipe having a full length of a metal pipe. In this case, the female thread at the end of the metal pipe of the reinforcing pipe is screwed and connected to the male thread 40 a of the second adapter sleeve 40 of the rotary adapter 36.
[0047]
When a striking force and a rotational force are applied to the drilling rod 26 at the time of embedding the reinforcing pipe, a rotational force is also applied to the casing shoe 34 rotatably fitted to the drilling rod 26 by frictional resistance. This rotation is not transmitted to the reinforcing tube 10 by the relative rotation of the first and second adapter sleeves 38, 40 of the rotary adapter 36. Therefore, breakage occurs at the screwing portion between the fiber reinforced resin pipe main body 12 of the reinforcing pipe 10 and the metal pipe opening 14 ′ or between the fiber reinforced resin or metal reinforcing pipe 10 and the rotary adapter 36. Will not occur.
[0048]
【The invention's effect】
According to the present invention, as described above, since the metal pipe end of the reinforcing pipe is rotatably connected to the casing shoe, the rotation of the drill bit may be transmitted to the casing shoe by frictional resistance. Also, this rotation is not transmitted to the end of the metal pipe, so it is broken at the screwed part between the fiber reinforced resin pipe main body of the reinforcing pipe and the metal pipe mouth or between the reinforcing pipe and the adapter. Does not occur.
[0049]
In addition, the first and second adapter sleeves of the rotary adapter interposed between the metal pipe end of the reinforcing pipe and the casing shoe are complementarily engaged with each other by inner and outer irregularities that complement each other so as to be rotatable with each other. Although the first adapter sleeve is connected, the first and second adapter sleeves of the rotating adapter of the reinforcing pipe have at least one vertical dividing groove corresponding to the concavo-convex connection portion. The diameter of the first adapter sleeve can be easily engaged by the diameter expansion of the first adapter sleeve by the diameter-enhancing vertical groove, and the vertical groove of the first adapter sleeve can adhere to the second adapter sleeve. Since the first and second adapter sleeves are not fixed to each other, the welded portion can be reliably prevented from being broken since the welded portion is closed by a welded portion using no solvent. Can.
[Brief description of the drawings]
FIG. 1 is a schematic side sectional view illustrating a state in which a reinforcing pipe is buried while excavating underground by the method of the present invention.
FIG. 2 is a schematic front sectional view showing the state of FIG. 1 from the front.
FIG. 3 is a longitudinal sectional view in which a part of a reinforcing pipe made of fiber reinforced resin is omitted as an example of a reinforcing pipe used in the present invention.
FIG. 4 is an enlarged side view showing a longitudinal section of an upper half portion of a mouth portion of a male screw metal pipe used in the reinforcing pipe of FIG. 3;
FIG. 5 is an enlarged side view showing a longitudinal section of an upper half portion of a female screw metal pipe mouth used for the reinforcing pipe of FIG. 3;
FIG. 6 is an enlarged vertical sectional view of a connection portion between a drilling unit, a drilling rod, and a reinforcing pipe.
FIG. 7 is an enlarged cross-sectional view of a rotary adapter coupled between a metal pipe mouth portion of a reinforcing pipe and a casing shoe.
8 shows an exploded state of the first and second adapter sleeves of the rotary adapter of FIG. 7; FIG. 8 (A) is an enlarged longitudinal sectional view of the first adapter sleeve, and FIG. It is an expanded sectional view of adapter sleeve No. 2.
FIG. 9 is a perspective view of a portion of the casing shoe having a vertical groove.
FIG. 10 is a front view of a welding portion of the casing shoe.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Tunnel 2 Ground 2a Ground 2b Drilled part 3 Face 10 Reinforcement pipe 10A1 Pipe unit 10A2 Pipe unit 10A3 Pipe unit 12 Pipe main body 12C Inclined surface 14 Metal pipe mouth 14 'Metal pipe mouth 18, 18' Part 20 rock drill 20S shank rod 22 hollow drilling rod 22A unit rod 24 shank rod coupling 26 drilling unit 28 drilling bit 28T carbide tip 30 ring bit 30T carbide tip 32 bit adapter 32S shoulder 32G side groove 32H Hollow hole 34 Casing shoe 34C Opposite inclined surface 34S Shoulder portion 36 Rotating adapter 38 First adapter sleeve 38SL Vertical dividing groove 40 for second diameter Second adapter sleeve 42 Concavo-convex coupling portion 42A Outer concavo-convex portion 42B of first adapter sleeve Inner peripheral uneven portion 46 of second adapter sleeve Annular groove 48 Wire connecting member 50 Bifurcated water guide hole 52 Backflow hole W Welded portion

Claims (5)

A reinforcing pipe to be embedded in a drilling hole and a drilling rod surrounded by the reinforcing pipe and connected to a shank rod of a rock drill are connected via a casing shoe, and the reinforcing pipe and the drilling rod are connected to each other. The reinforcing pipe is pushed into the ground together with the drilling rod while drilling in the ground by a drilling unit attached to the tip of the drilling rod, operated by a rock drill, and then the drilling rod is reinforced. In the method of embedding a reinforcing pipe for underground drilling to be pulled out from a pipe, the metal pipe end of the reinforcing pipe and the casing shoe are connected so as to be rotatable with each other and the casing shoe is cut from the drilling rod. Burying while preventing rotation transmitted to the metal pipe from being transmitted to the end of the metal pipe of the reinforcing pipe. The method of burying a reinforcing pipe for underground drilling according to claim 1, wherein a rotating adapter is interposed between a metal pipe end of the reinforcing pipe and the casing shoe, and the rotating adapters rotate relative to each other. A first adapter sleeve and a second adapter sleeve rotatably coupled by a concave / convex coupling portion formed from inner and outer concave / convex portions that are freely meshed and complemented, wherein the first adapter sleeve is A portion corresponding to the coupling portion has at least one vertical dividing groove for expanding the diameter, and the outer peripheral uneven portion of the second adapter sleeve is inserted into the inner peripheral uneven portion of the first adapter sleeve while expanding the vertical dividing groove. Burying the vertical groove of the first adapter sleeve with a solvent that does not adhere to the second adapter sleeve. 3. The method of burying a reinforcing pipe for underground drilling according to claim 1, wherein the reinforcing pipe includes a pipe main body made of a fiber-reinforced resin and a metal pipe opening connected to an end of the pipe main body. 4. Wherein the end of the metal pipe of the reinforcing pipe is the mouth of the metal pipe. A rotary adapter for connecting a reinforcing pipe and a casing shoe used in the method for burying a reinforcing pipe for underground drilling according to claim 1, wherein the rotary adapter is formed from inner and outer concave and convex portions which are rotatably meshed with each other and complemented. A first adapter sleeve and a second adapter sleeve rotatably coupled by a concave / convex coupling portion, wherein the first adapter sleeve is connected to the casing shoe, and wherein the second adapter sleeve is connected to the casing shoe. A connection rotary adapter, wherein the sleeve is connected to a metal pipe end of the reinforcing pipe. 5. The rotary adapter for a connection part according to claim 4, wherein the first adapter sleeve has at least one diameter-enlarged vertical groove at a portion corresponding to the concave-convex joint, and the first and the second adapter sleeves have the same diameter. The concave and convex portions of the second adapter sleeve are engaged with each other by expanding the diameter in the vertical groove of the first adapter sleeve, and the vertical groove uses a solvent that does not adhere to the second adapter sleeve. A rotary adapter for connection characterized by being closed by a welded part.

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