JP5148993B2 - Propulsion method and mechanism for tubular body - Google Patents

Description

  The present invention relates to a tubular body propulsion method and a propulsion mechanism.

  Conventionally, as a method of replacing existing pipes such as water pipes buried underground without digging, the existing pipes (old pipes) are removed by breaking the existing pipes using plasma cutting and expanding the diameter. There is a method of replacing the existing pipe with a new pipe having the same diameter as the existing pipe. This method uses a plasma torch in advance to cut grooves in the pipe axis direction and the circumferential direction in an existing pipe, and then inserts it in the pipe axis direction using a diameter expanding device having a tapered diameter expanding portion. The existing pipe is expanded and fractured, and then the new pipe is propelled from the base end side and is laid while being sequentially connected (for example, see Patent Document 1).

In such a propulsion method for propelling pipes such as new pipes, new pipes are added sequentially to the starting point side in the propulsion direction, and a reaction force is applied to the reaction wall by a propulsion jack installed at the starting pit at the rear end of the pipe. It is common to adopt a propulsion mechanism that takes propulsion force and gives propulsive force, and pushes the preceding tube in accordance with propulsion.
JP 2007-39934 A

However, the conventional tube propulsion method has the following problems.
That is, since the existing pipe is slightly bent at the adjacent joint portion, in the process of propelling while connecting the new pipe, the bending of the existing pipe is transmitted to the pipe body in the start shaft through the new pipe, The pipe body in the shaft vibrates and a deviation occurs between the axial direction of the propulsion jack and the axial direction of the pipe body, and a lateral force acts on the propulsion jack and vibrates (bends back). There was a problem that the propulsive force could not be transmitted reliably.
On the other hand, the tube body is pressed so as not to move with steel materials or wires, and vibrations acting on the tube body are mechanically suppressed, but it cannot be reliably suppressed. There was room for improvement.

  The present invention has been made in view of the above-described problems, and provides a tubular body propulsion method and a propulsion mechanism that can reliably transmit the propulsive force to the tubular body by eliminating the vibration of the propulsion jack. For the purpose.

In order to achieve the above object, in the tube propulsion method according to the present invention, the tube receiving rail whose longitudinal direction is in the same direction as the axial direction of the tubular body, and the longitudinal direction perpendicular to the axial direction of the tube receiving rail. Place the tube receiving rail on the rail receiving member in a non-fixed state, and place the tube receiving rail so that it can move on the rail receiving member. The propulsion jack for pushing out the tube is placed in a state where the tube body and the propulsion jack can move together, and the reaction force receiving member provided behind the propulsion jack and the propulsion jack are brought into contact with each other through the spherical seat. The tube is propelled forward by extending the propulsion jack along the tube receiving rail.

Further, the propulsion mechanism according to the present invention is a propulsion mechanism for propelling the tubular body forward by pushing the tube body from the rear by extending the propulsion jack by taking a reaction force on the reaction force receiving member, and in the longitudinal direction. With the tube body and propulsion jack mounted in a state where the tube body and the propulsion jack can move integrally, and a tube receiving rail that supports the tube body and the propulsion jack from below, and a longitudinal direction of the tube receiving rail. A rail receiving member disposed in a direction orthogonal to the axial direction of the tube receiving the tube receiving rail in a non-fixed state , and the tube receiving rail is mounted so as to be movable on the rail receiving member, The reaction force receiving member and the propulsion jack are in contact with each other via a spherical seat.

  In the present invention, the tube body and the propulsion jack are supported by the same tube receiving rail, and the tube receiving rail is mounted so as to be movable on the rail receiving member. The axial direction of the tube body and the propulsion jack can always coincide with each other. Furthermore, since the abutting portion between the propulsion jack and the reaction force receiving member is configured to be pivotally abutted in an arbitrary direction by the spherical seat, the position of the propulsion jack moves together with the tubular body and changes its direction. Even so, the reaction force of the propulsion jack can be taken from the reaction force receiving member via the spherical seat, and the propulsion force can be reliably transmitted to the tube.

  According to the tubular body propulsion method and the propulsion mechanism of the present invention, since the propulsion jack and the tubular body are mounted on the same tube receiving rail, there is a bend in the connecting portion between the tubular bodies that are propelled. Even so, the axial direction of the tube directly pushed out by the propulsion jack and the propulsion jack can always be matched, and the propulsion jack and the reaction force receiving member are always in contact with each other via the spherical seat. The reaction force of the propulsion jack can be taken from the reaction force receiving member, and the propulsion force can be reliably transmitted to the pipe body. Accordingly, since the axial direction of the tube body and the propulsion jack do not coincide with each other as in the prior art, it is possible to eliminate the problem that the propulsion jack undergoes vibration due to bending back during propulsion.

Hereinafter, a tube propulsion method and a propulsion mechanism according to an embodiment of the present invention will be described with reference to FIGS. 1 to 5.
1 is a side view showing an outline of a propulsion method for a propulsion pipe according to an embodiment of the present invention, FIG. 2 is a sectional view taken along line AA shown in FIG. 1, and FIG. 3 is an enlarged view of a spherical seat shown in FIG. 4 is a view showing another example of a spherical seat, corresponding to FIG. 3, FIG. 5 is a view showing a propulsion mechanism at the time of propulsion, and FIG. FIG. 5B is a diagram in the case where the propulsion pipe is bent.

The code | symbol 1 shown in FIG. 1 is a propulsion mechanism for propelling the propulsion pipe 2 (pipe body) by this Embodiment embed | buried in the ground by a propulsion construction method. In the propulsion method of the propulsion pipe 2 according to the present embodiment, the propulsion mechanism 1 is disposed on the start point side in the propulsion direction, and the propulsion pipe 2 having a predetermined length is sequentially connected from the start point to the end point side for propulsion. It has become a method.
In addition, as needed, the propulsion side in the propulsion direction of the propulsion pipe 2 will be described as “front” and “front end”, and the opposite sides as “rear” and “rear end”.

  As shown in FIGS. 1 and 2, the propulsion pipe 2 propulsion method using the propulsion mechanism 1 can move the pipe receiving rails 4 and 4 on a plurality of rail receiving members 5, 5,. The propulsion pipe 2 and the propulsion jacks 3 and 3 are placed along the pipe receiving rails 4 and 4, and the reaction force receiving member 6 and the propulsion jack 3 provided at the rear of the propulsion jacks 3 and 3 are disposed. The propulsion pipe 2 is propelled forward by abutting through the spherical seat 7 and extending the propulsion jack 3 along the pipe receiving rails 4 and 4.

  That is, the propulsion mechanism 1 includes a propulsion jack 3 that pushes out the propulsion pipe 2 from the rear, pipe receiving rails 4 and 4 that support the propulsion pipe 2 and the propulsion jack 3 from below, and a pipe receiving rail that is fixed on the floor 12. A plurality of rail receiving members 5, 5,... That can be moved, and a reaction force receiving member 6 that is fixed to the structure side wall 11 and receives the driving reaction force of the propulsion jack 3. A spherical seat 7 provided between the propulsion jack 3 and the reaction force receiving member 6 is schematically configured.

  Two propulsion jacks 3 are provided in parallel along the tube receiving rails 4, 4. One end 3 a is fixed to the rear end 2 a of the propulsion tube 2, and the other end 3 b is interposed via a spherical seat 7 described later. It is the structure which contact | abutted to the reaction force receiving member 6 (refer FIG. 3). Each propulsion jack 3 is placed on a jack receiving stand 8 whose jack body 31 is fixed on the tube receiving rail 4 so as to be movable in the propulsion direction.

  As shown in FIG. 2, the jack support base 8 is made of an H-shaped steel material, and is provided with support convex portions 8 a and 8 a along the longitudinal direction on both sides of the upper edge portion in a cross-sectional view. The jack body 31 of the propulsion jack 3 is placed on the pair of support convex portions 8a and 8a. Therefore, the propulsion jack 3 is configured to be movable along the jack support base 8, and has a configuration in which movement in a direction substantially orthogonal to the movement direction is restricted by the pair of support convex portions 8a and 8a.

  The tube receiving rails 4, 4 are made of H-shaped steel, and are supported by upper edge portions 4 a, 4 a disposed opposite to each other so that the positions of the obliquely lower portions of the propulsion tube 2 are brought into contact with each other. The two propulsion jacks 3 and 3 are placed and supported via 8 at a predetermined interval in parallel. That is, each of the tube receiving rails 4 and 4 is arranged in a state in which the longitudinal direction thereof is substantially in the same direction as the axial direction of the propulsion tube 2 (reference numeral O2 shown in FIG. 5A). As shown in FIG. 2, the pair of tube receiving rails 4 and 4 are connected by a connecting member 41 at an appropriate position. A lubricant is applied to the contact portion between the tube receiving rails 4 and 4 and the propulsion tube 2 so that they are easily slidable with each other.

  The plurality of rail receiving members 5, 5,... Are H-shaped steel materials, and the longitudinal direction thereof is arranged in a direction orthogonal to the axial direction of the tube receiving rails 4, 4 (corresponding to the propulsion direction of the propulsion tube 2). Each is fixed on the floor 12 in parallel with a predetermined interval. Therefore, the pair of tube receiving rails 4, 4 are placed in a non-fixed state on the rail receiving members 5, 5,... And can move freely.

  As shown in FIGS. 1 and 3, the spherical seat 7 is engaged with a convex curved surface 71 provided at the rear end 3b of the propulsion jack 3 and the convex curved surface 71 in a freely rotating manner in any direction. It consists of a concave curved surface 72 having the same curvature as or slightly smaller than the convex curved surface 71 formed on the receiving member 7A. Here, the receiving member 7 </ b> A is provided between the rear end 3 b of the propulsion jack 3 and the reaction force receiving member 6 so as to be in contact with the reaction force receiving member 6.

That is, the convex curved surface 71 protrudes from the rear end surface of the propulsion jack 3 to the reaction force receiving member 6 side (receiving member 7A side) and is formed in a smooth arc surface shape. The concave curved surface 72 is the same as the convex curved surface 71. Alternatively, it is formed by a curved surface that is recessed in a bowl shape having a slightly smaller curvature.
The convex curved surface 71 is loosely fitted to the concave curved surface 72 so as not to fall off. That is, the propulsion jack 3 can move freely within the concave curved surface 72 of the convex curved surface 71 and can freely change the direction with respect to the spherical seat 7. In the spherical seat 7, the convex curved surface 71 is always in contact with the concave curved surface 72 when the propulsion jack 3 extends. As shown in FIG. 4, the curvature of the concave curved surface 72 may be made relatively smaller than the curvature of the convex curved surface 71 so that a part of the convex curved surface 71 abuts the concave curved surface 72.

Next, the effect | action of the propulsion method of the propulsion pipe 2 by this Embodiment is demonstrated based on drawing.
As shown in FIG. 5A, when the joint portions of the propelled pipes 2 that have already been propelled are arranged in a straight line without bending, that is, the central axis O1 of the propulsion pipes 2A and 2B coupled in the front-rear direction. , O2 and the center axis O3 of each propulsion jack 3 are oriented in the same direction, the center axis O3 of the propulsion jack 3 and the center axis O4 of the concave curved surface 72 of the receiving member 7A coincide with each other. . Therefore, reaction force can be applied to the reaction force receiving member 6 by the propulsion jacks 3 and 3 and the propulsion force can be reliably transmitted to the propulsion pipe 2.

  As shown in FIGS. 1 and 2, the propulsion pipe 2 and the propulsion jacks 3 and 3 are supported by the same pipe receiving rails 4 and 4, and the pipe receiving rails 4 and 4 are connected to rail receiving members 5 and 5. ... Is mounted so that it can move above, so that the propulsion jack 3 moves together via a jack receiving stand 8 fixed to the tube receiving rail 4 in accordance with the position of the propelling tube 2B to be directly pushed out. The axial direction of the propulsion pipe 2 and the propulsion jacks 3 and 3 can always be matched.

  Since the abutting portion between the propulsion jack 3 and the reaction force receiving member 6 is abutted by the spherical seat 7 so as to be freely rotatable in any direction, the propulsion is performed as shown in FIG. Even when the connecting portion between the tubes 2A and 2B is bent and the position of the propulsion jack 3 moves with the propulsion tube 2 and changes its direction, the reaction force of the propulsion jack 3 is received by the reaction force via the spherical seat 7. It becomes possible to take from the member 6, and the propulsive force can be reliably transmitted to the propulsion pipe 2.

  More specifically, as shown in FIG. 5 (b), the propulsion pipe 2B (the propulsion pipe 2 directly pushed out by the propulsion jack 3) located at the rearmost end is adjacent to the front side of the propulsion pipe 2A (center axis O1). , The central axis O2 ′ of the propulsion pipe 2B and the central axes O3 ′ and O3 ′ of the propulsion jacks 3 and 3 are in the same direction.

  At this time, the propulsion pipe 2B is locked in a state of being sandwiched between the upper edge portions 4a and 4a (see FIG. 2) of the pipe receiving rails 4 and 4, so that the rails are connected to the pipe receiving rails 4 and 4 Although the movement in the axial direction is possible, the movement in the direction orthogonal to the rail axial direction is restricted. Further, the propulsion jack 3 with respect to the tube receiving rails 4 and 4 also has a portion of the jack main body 31 between the support convex portions 8a and 8a (concave portions) of the jack receiving frame 8 to which the tube receiving rails 4 and 4 are fixed. Since it is locked in a clamped state, it can move in the axial direction with respect to the jack receiving stand 8, but the movement in the direction orthogonal to the axial direction is restricted. It has become.

That is, the direction of the tube receiving rails 4 and 4 is determined in accordance with the direction of the propulsion tube 2B located at the rearmost end during propulsion, and the direction of the propulsion jacks 3 and 3 is determined in accordance with the direction of the tube receiving rails 4 and 4. Since the direction is determined, the directions of the central axes of the propulsion pipe 2B and the propulsion jack 3 always coincide with each other.
At this time, the center axis O3 ′ of the propulsion jack 3 and the center axis O4 of the concave curved surface 72 are shifted by a predetermined inclination angle θ (see FIG. 3). However, when the propulsion jack 3 extends, the convex curved surface 71 Since it always abuts against the concave curved surface 72, it is possible to propel the propulsion pipe 2 by applying a reaction force to the reaction force receiving member 6.

  As described above, in the tubular body propulsion method and the propulsion mechanism according to the present embodiment, the propulsion jack 3 and the propulsion pipe 2 are mounted on the same pipe receiving rails 4 and 4. 2 (symbols 2A and 2B shown in FIG. 5B), the axial direction of the propulsion pipe 2 and the propulsion jack 3 that are directly pushed out by the propulsion jack 3 should always be matched even when there is a bend in the connecting portion between the two. In addition, since the propulsion jack 3 and the reaction force receiving member 6 are always in contact with each other via the spherical seat 7, the reaction force of the propulsion jack 3 can be taken from the reaction force receiving member 6, and the propulsion is performed. The force can be reliably transmitted to the propulsion pipe 2. Therefore, it is possible to eliminate the problem that the axial direction of the propulsion pipe 2 and the propulsion jack 3 do not coincide with each other as in the prior art, and a lateral vibration occurs during propulsion.

Although the embodiments of the tubular body propulsion method and the propulsion mechanism according to the present invention have been described above, the present invention is not limited to the above-described embodiments, and can be appropriately changed without departing from the scope of the present invention. .
For example, in this embodiment, the propulsion mechanism 1 is configured to propel the propulsion pipe 2 with two propulsion jacks 3 and 3. However, the propulsion mechanism 1 is not limited to two propulsion jacks, and may be three or more. Absent.
Further, in the present embodiment, the concave curved surface 72 for engaging the convex curved surface 71 is formed on the receiving member 7A. However, the present invention is not limited to this configuration. For example, the concave curved surface 72 is formed on the reaction force receiving member 6. It may be what you did.

And in this Embodiment, although the propulsion jack 3 is mounted on the pipe receiving rail 4 via the jack receiving stand 8 which consists of H-shaped steel material, Alternatively, a configuration in which the jack support base 8 is not provided may be used.
Furthermore, the structure, shape, length dimension, quantity, etc. of the tube receiving rail 4, the rail receiving member 5, and the reaction force receiving member 6 are not particularly limited, and the outer diameter, weight, and length of the propulsion pipe are not limited. It can be arbitrarily set according to conditions such as a shaft space.

It is a side view which shows the outline | summary of the propulsion method of the propulsion pipe by embodiment of this invention. It is the sectional view on the AA line shown in FIG. It is an enlarged view of the spherical seat shown in FIG. It is a figure which shows the other example of a spherical surface, Comprising: It is a figure corresponding to FIG. It is a figure which shows the propulsion mechanism at the time of propulsion, (a) is a figure in case a propulsion pipe is arrange | positioned at linear form, (b) is a figure in case a bend is in a propulsion pipe.

Explanation of symbols

1 Propulsion mechanism 2 Propulsion pipe (tube)
3 Propulsion jack 4 Tube receiving rail 5 Rail receiving member 6 Reaction force receiving member 7 Spherical seat slightly 71 Convex curved surface 72 Concave curved surface 8 Jack receiving stand

Claims (2)

A tube receiving rail whose longitudinal direction is oriented in the same direction as the axial direction of the tubular body is placed in a non-fixed state on a rail receiving member which is arranged with the longitudinal direction oriented in a direction perpendicular to the axial direction of the tubular rail. And placing the tube receiving rail so as to be movable on the rail receiving member,
The tube body and the propulsion jack for pushing the tube body from the rear along the tube receiving rail are placed in a state where the tube body and the propulsion jack can move integrally ,
The reaction force receiving member provided behind the propulsion jack and the propulsion jack are brought into contact with each other via a spherical seat,
A method of propelling a tubular body, wherein the tubular body is propelled forward by extending the propulsion jack along the tube receiving rail. A propulsion mechanism for propelling the tube forward by pushing the reaction tube back from the reaction force receiving member and extending the propulsion jack,
A tube receiving rail for supporting the tube body and the propulsion jack from below by placing the tube body and the propulsion jack in a state in which the longitudinal direction is in the same direction as the axial direction of the tube body and the tube body and the propulsion jack are integrally movable. ,
A rail receiving member that is arranged with its longitudinal direction oriented in a direction perpendicular to the axial direction of the tube receiving rail, and for placing the tube receiving rail in an unfixed state ;
With
The tube receiving rail is movably mounted on the rail receiving member,
The propulsion mechanism, wherein the reaction force receiving member and the propulsion jack are in contact with each other via a spherical seat.

Images