JP3155356B2 - Thrust transmission method and device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for transmitting thrust to a pipe to advance the pipe through a hole formed in the ground.

[0002]

2. Description of the Related Art In a pipe propulsion method of constructing a pipeline in the ground, a plurality of pipes are formed in the ground by a leading device such as a shield type tunnel excavator by a thrust generated by a main pushing device. Are sequentially pressed. However, in this type of pipe propulsion method, simply transmitting the thrust to the rear end face of the pipe increases the required thrust in proportion to the length of the pipeline to be constructed, that is, the length between the shafts. A large compressive force acts on the rearmost tube, and the tube may be damaged.

In order to solve the above-mentioned problem, a technique has been proposed in which thrust is transmitted to a rear end face of a rearmost pipe and a rear end face of at least one other pipe. However, according to this known technique, when a soft pipe such as a pipe made of vinyl chloride is used, the pipe is expanded in a radial direction by a compressive force in an axial direction and is damaged.

In order to solve the above-mentioned problems, elastically deformable tubes are arranged for each tube, and each tube is inflated with a fluid to frictionally engage each tube with the inner surface of the corresponding tube. A technique for advancing each tube by advancing each tube has been proposed. However, in this known technique, since an elastically deformable tube is used, the engaging force between the tube and the tube is small due to the elastic deformation of the tube, and as a result, the tube cannot be advanced.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to ensure that even if a soft pipe such as a pipe made of vinyl chloride is used, the pipe is reliably advanced without damaging the pipe. .

[0006]

A thrust transmitting method according to the present invention is a method for transmitting a thrust for advancing a plurality of pipes in a hole formed in the ground to the pipes, which can be expanded in a radial direction of the pipes. And disposing the tubular body in the pipe, expanding the tubular body in the radial direction by the thrust to abut on the inner surface of the pipe, and moving the tubular body forward.

In the thrust transmitting method of the present invention, while the thrust acts on the tubular body, the tubular body is expanded in the radial direction and frictionally engages with the inner surface of the pipe, and is advanced in that state. This will advance the tube.

A thrust transmitting device of the present invention is a device for transmitting thrust for advancing a plurality of pipes in a hole formed in the ground to the pipes. A plurality of relays that receive the thrust and sequentially transmit the thrust, of the adjacent relays, a first tubular body coupled to the front end of the rear relay, And a second tubular body engaged with the rear end of the forward relay body so as to be able to expand in the radial direction of the pipe, wherein the first and second tubular bodies have the thrust of When acting on the first cylindrical body, each has a contact portion that expands the second cylindrical body in the radial direction in cooperation with each other.

In the thrust transmitting device of the present invention, when the thrust is transmitted to the rear relay, the first tubular body is advanced,
The second tube is radially enlarged, so that the second tube frictionally engages the inner surface of the tube. Accordingly, the pipe is advanced by the second tubular body being frictionally engaged with the inner surface of the pipe while the thrust is being transmitted to the rear relay body.

According to the present invention, the thrust is transmitted to the inner surface of the pipe through the cylindrical body expanded in the radial direction by the thrust, and there is no need to use an elastically deformable member as the cylindrical body. Because of the large frictional engagement force between the tubular body and the pipe,
Even if a soft pipe such as a pipe made of vinyl chloride is used, the pipe can be reliably advanced without damaging the pipe.

It is preferable that the contact portion of at least one of the first and second cylindrical bodies is defined by at least one surface portion whose diameter dimension gradually increases from front to rear. Thus, when the thrust is transmitted to the first tubular body, the second tubular body is surely expanded in the radial direction and receives the thrust without fail. The frictional engagement force is increased, so that the tube can be advanced more reliably.

It is preferable that at least one of the first and second cylindrical bodies has the abutting portion defined by a plurality of the surface portions forming a part of a conical shape having the same apex angle.
Accordingly, since the apex angle is a surface portion forming a part of the same conical shape, the second cylindrical body is expanded in parallel to the radial direction, and as a result, friction between the second cylindrical body and the pipe is increased. The engagement force is larger, and as a result, the tube can be more reliably advanced.

The contact portion of the first cylindrical body is defined by at least one outer peripheral surface portion whose diameter dimension gradually increases from front to rear, and the contact portion of the second cylindrical body is Preferably, the diameter dimension is defined by at least one inner circumferential surface portion that gradually increases from front to back. Thus, thrust can be reliably transmitted from the first tubular body to the second tubular body, and the second tubular body can be more reliably expanded in the radial direction.

The outer peripheral surface and the inner peripheral surface may form a part of a cone having the same apex angle. Further, a plurality of the outer peripheral surface portions and a plurality of the inner peripheral surface portions each forming a part of a conical shape having the same apex angle can be formed in the first and second cylindrical bodies, respectively.

The second cylindrical body is a plurality of members sequentially arranged around the axis and is engaged with a rear end of the front relay body. May be provided.

Further, it is preferable to include at least one annular elastic member which is arranged on an outer peripheral portion of the second cylindrical body and urges the second cylindrical body in the radially reducing direction. . Thus, when the second tubular body is retracted, the second tubular body is forcibly reduced by the elastic member.

The first tubular body has a first engaging portion defined by a surface facing rearward, and the second tubular body is a first engaging portion engageable with the first engaging portion. It is preferable to have a second engaging portion defined by a second engaging portion and a surface facing forward. Thus, the second tubular body can be retracted by retracting the second tubular body, so that the thrust transmission device can be easily removed from the inside of the pipe.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, a thrust transmitting device 10 includes a thrust generated by a main pushing device 12 and a leading device 14 for forming a hole in the ground, and a plurality of serially disposed behind the leading device 14. To the tube 16 so that the leading device 14 and the tube 16 can be advanced.

The main pushing device 12 includes a plurality of multi-stage jacks 18 driven synchronously, and a pipe 1 driven by driving the jacks.
6 includes a slider 22 reciprocated in the axial direction 20 and a rail 24 for restricting the movement of the slider. The main pushing device 12 is arranged in a starting shaft 26. A reaction wall 28 is formed in the shaft 26.

The leading device 14 is a known arbitrary device such as a device for forming a hole while excavating the ground like a shield type tunnel excavator, and a device for forming a hole without excavating the ground like a pile driver. A lead device can be used. A sleeve 30 is arranged around the adjacent tubes 16. Each sleeve 30 is made of a soft material such as vinyl chloride and has a corresponding tube 16 made of an adhesive or the like.
Adhered to.

As shown in FIGS. 2 to 5, the thrust transmitting device 1
Numeral 0 denotes a plurality of tubular relay bodies 32 sequentially arranged in the front-rear direction in a pipe formed by the pipe 16 and receives a thrust when the slider 22 is advanced, and the thrust is disposed at the rear end. Push wheel 34 (FIG. 2) for transmitting to the rear end face of relay body 32
), And of the adjacent relay bodies 32, the rear relay body 3
2 includes a first cylindrical body 36 connected to the front end of the second relay body 32 and a second cylindrical body 38 connected to the rear end of the front relay body 32 among the adjacent relay bodies 32.

Each of the relays 32 is made of a material having high mechanical strength such as a metal, and has a flange 4 on its outer peripheral surface at its rear end and its outer peripheral surface at the center in the longitudinal direction.
It has 0 and 42. The flange portion 42 is provided for reinforcing the relay body 32, and therefore the flange portion 42 may not be provided.

As shown in FIGS. 3 and 4, the first and second tubular bodies 36 and 38 are provided for each pair of adjacent relay bodies 32. Each first cylindrical body 36 is provided integrally with the front end of the rear relay body 32 among the adjacent relay bodies 32. On the other hand, each second cylindrical body 38 is
Of the adjacent relays 32, the relays 32 are engaged with the flange portions 40 of the front relay 32 so as to be expandable in the radial direction.

Each of the first cylindrical bodies 36 has a plurality of outer peripheral surfaces 44 whose diameters gradually increase from the front to the rear.
Each of the second cylindrical bodies 38 has a plurality of inner peripheral surfaces 46 whose diameter dimension gradually increases from the front to the rear, and is spaced apart in the direction of the axis 20. It has it in the place where it was put. Outer peripheral surface 44 and inner peripheral surface 46
Form part of a cone with the same apex angle. The first and second cylindrical bodies 36 and 38 are in contact with the outer peripheral surface 44 and the inner peripheral surface 46.

The first and second cylindrical bodies 36 and 38 have engaging portions 48 and 50 which can contact each other. The engaging portion 48 of the first tubular body 36 is defined by a surface facing rearward, and the engaging portion 50 of the second tubular body 38 is defined by a surface facing backward.

The second cylindrical body 38 is divided into a plurality of split members 52 sequentially arranged around the axis 20. The split member 52 is movably engaged with the flange portion 40 of the forward relay body 32 among the adjacent relay bodies 32,
The inner peripheral surface portion 46 and the engaging portion 50 are defined in cooperation with each other. The split member 52 is urged in a direction in which the second cylindrical body 38 is reduced by a plurality of annular elastic members 54 arranged on the outer peripheral portion of the second cylindrical body 38.

In the illustrated example, one set of the relay body 32 and the first and second cylindrical bodies 36 and 38 is provided for one pipe 16. However, the relay body 32 and the first and second cylindrical bodies 36 and 38 are provided. Of the cylindrical bodies 36 and 38 may be arranged as one set for a plurality of tubes 16 or a plurality of sets for one tube. FIG.
In the above, the collar 56 is disposed between the rearmost tube 16 and the pressing ring 34, but the collar 56 may not be provided.

As shown in FIG. 3, before the thrust is transmitted to the last relay body 32, the first relay body 32 disposed in relation to the rearmost relay body 32 and the relay body 32 in front thereof. The tubular body 36 is separated from the rear end face of the relay body 32 in front,
The second cylindrical body 38 is reduced. Therefore, the second cylindrical body 38 is not pressed against the inner surface of the tube 16.

As the leader 14 and tube 16 are advanced, the jack 18 is extended synchronously. This allows
Since the slider 22 is moved forward, the original pushing device 12
Is transmitted to the rear end face of the rearmost relay body 32 via the pressing wheel 34.

When the thrust is transmitted to the rearmost relay body 32, the first tubular body 36 is pushed forward against the second tubular body 38, and as shown in FIG. The tubular body 36 contacts the rear end surface of the front relay body 32. Thus, the thrust transmitted to the rear relay body 32 is reduced by the first cylindrical body 36.
Is transmitted to the relay body 32 in front of the vehicle.

When the first relay 36 is moved forward with respect to the second relay 38, the second relay 38 is moved radially outward by the first relay 36 as shown in FIG. And is pressed against the inner surface of the tube 16. Therefore, the first cylindrical body 36 is maintained in a state of being in contact with the rear end surface of the front relay body 32, and the second cylindrical body 38 is maintained in a state of being pressed against the inner surface of the tube 16. Thereby, the second relay body 38
Is advanced in frictional engagement with the inner surface of the tube 16 and the tube 1
6 is advanced with the advance of the second relay body 38.
The leading device 14 receives a thrust via a state-of-the-art relay.

The lead device 14 and the tube 16 are combined into one tube 16
When the jack 18 is advanced by a distance corresponding to the length of the
Is contracted and new tubes, relays and first and second
Are arranged at the rearmost portions, and the jack is extended again. Thereafter, the leading device 14 and the pipe 16 are advanced a predetermined distance, the jack 18 is contracted, and a new
The tube, relay, and first and second tubulars are located at the rear end and the process of extending the jack again is repeated.

When the leading device 14 reaches the arrival shaft,
An operation of removing the leading device 14 and the thrust transmission device 10 is performed. The leading device 14 is removed to the side of the arrival shaft (not shown), while the thrust transmission device 10 is removed to the starting shaft 26.

When the thrust transmission device 10 is removed, a force that pulls the thrust transmission device 10 back toward the starting shaft 26 is applied by the jack 18 to the rearmost relay body 32. As a result, the first tubular body 36 is retracted with respect to the second tubular body 38, so that the second tubular body 38 is reduced by the elastic member 54 and separated from the inner surface of the tube 16. When the first tubular body is further pulled back, the first and second tubular bodies 36,
The engagement portions 48 and 50 of the 38 come into contact with each other, and the second tubular body 38 and the front relay body 32 engaged with the second tubular body are pulled back.

According to the thrust transmission device 10, the outer peripheral surface portion 44
And the inner peripheral surface portion 46 forms a part of a conical shape having the same apex angle, so that the displacement of the first and second cylindrical bodies 36 and 38 is stabilized, and the thrust is reduced from the first cylindrical body 36. The second cylindrical body 38 is reliably transmitted to the second cylindrical body 38, and the second cylindrical body 38 is reliably expanded in the radial direction, so that the second cylindrical body 38 is securely frictionally engaged with the inner surface of the tube 16.

However, according to the present invention, instead of providing a plurality of sets of the outer peripheral surface 44 and the inner peripheral surface 46, one set of the outer peripheral surface 4
4 and the inner peripheral surface 46 may be provided, or the outer peripheral surface 44
One of the inner peripheral surface portion 46 and the inner peripheral surface portion 46 may be a projecting portion.
Instead of using as a contact portion of the second cylindrical bodies 36 and 38, a contact portion having another shape may be used.

[Brief description of the drawings]

FIG. 1 is a diagram showing one embodiment of a pipe propulsion device using a thrust transmission device of the present invention.

FIG. 2 is an enlarged sectional view of a part 2 in FIG.

FIG. 3 is an enlarged sectional view of a part 3 in FIG.

FIG. 4 is a cross-sectional view similar to FIG. 3, showing a state where a second tubular body is frictionally engaged with an inner surface of a tube.

FIG. 5 is a sectional view taken along line 5-5 in FIG. 4;

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 thrust transmitting device 12 main pushing device 14 leading device 16 tube 20 axis 30 sleeve 32 relay body 36 first cylindrical body 38 second cylindrical body 44 outer peripheral surface portion (contact portion) 46 inner peripheral surface portion (contact portion) ) 48,50 engaging portion 52 split member

Claims (10)

(57) [Claims] 1. A method for transmitting a thrust for advancing a plurality of tubes in a hole formed in the ground to the tubes, wherein a tubular body expandable in a radial direction of the tubes is disposed in the tubes. A thrust transmitting method, comprising: expanding the cylindrical body in the radial direction by the thrust to abut on the inner surface of the tube and advancing the cylindrical body. 2. An apparatus for transmitting a thrust to a plurality of pipes to advance the pipes in a hole formed in the ground to the pipes, the relays being sequentially arranged in the pipes in the front-rear direction and receiving the thrusts. And a plurality of relays that sequentially transmit the thrust,
A first tubular body connected to a front end of a rear relay body among adjacent relay bodies and a rear end part of a front relay body among adjacent relay bodies can be radially expanded to the pipe. A second cylindrical body engaged with the first cylindrical body, wherein the first and second cylindrical bodies cooperate with each other when the thrust acts on the first cylindrical body. A thrust transmission device having contact portions for expanding a cylindrical body in the radial direction. 3. The abutting portion of at least one of the first and second cylindrical bodies is defined by at least one surface portion whose diameter dimension gradually increases from front to back. 3. The thrust transmission device according to 1. 4. The method according to claim 2, wherein the abutting portion of at least one of the first and second cylindrical bodies is defined by a plurality of surface portions forming a part of a conical shape having the same apex angle. A thrust transmission device as described. 5. The abutting portion of the first cylindrical body is defined by at least one outer peripheral surface portion whose diameter dimension gradually increases from front to rear, and the abutting portion of the second cylindrical body. The thrust transmission device according to claim 2, wherein the portion is defined by at least one inner peripheral surface portion whose diameter dimension gradually increases from front to rear. 6. The thrust transmission device according to claim 5, wherein the outer peripheral surface and the inner peripheral surface form a part of a conical shape having the same apex angle. 7. The method according to claim 6, wherein each of the first and second cylindrical bodies has a plurality of the outer peripheral surface portions and a plurality of the inner peripheral surface portions forming a part of a conical shape having the same apex angle. A thrust transmission device as described. 8. The second tubular body is a plurality of members sequentially arranged around the axis, the second tubular body being engaged with a rear end of the forward relay body, and cooperating with each other to form the inner cylindrical body. 8. The method according to claim 5, further comprising a plurality of members that define a peripheral surface portion.
The thrust transmission device according to the item. 9. The semiconductor device further includes at least one annular elastic member disposed on an outer peripheral portion of the second cylindrical body and biasing the second cylindrical body in a direction to reduce the radial direction. The thrust transmission device according to any one of claims 2 to 8. 10. The first tubular body has a first engaging portion defined by a surface facing rearward, and the second tubular body is engageable with the first engaging portion. The thrust transmission device according to any one of claims 2 to 9, further comprising a second engagement portion defined by a surface facing forward, the second engagement portion being a second engagement portion.