JPH0621995Y2 - Pipe for retracting method - Google Patents

Description

[Detailed Description of the Invention] Industrial field of use [Technical Field] The present invention relates to a pipe for a retracting method used in a so-called traction method such as a non-open cutting pipeline renewal method (PAP method).

Prior Art Mall with built-in air hammer as shown in FIG. 9 (A)
While crushing the existing pipe 102 with 101, pulling from the front with a cable 105 connecting the tip of the mall 101 and the winch 103
With the PAP method of laying a new pipe 108 from 6 to the reaching pit 107 along the existing pipeline, or with the pilot pipe 112 that connects the tip of the front conductor 111 and a winch or hydraulic jack (not shown) as shown in FIG. Tow from the front to reach from departure mine 106
Up to 7 there is known a traction method of laying a new pipe 108 in the ground.As a new pipe 108 used for such a construction method, conventionally, for example, as shown in FIG. 10, the outer diameter is almost equal in the axial direction, and There is a concrete exterior pipe with a smooth outer surface.

This pipe 108 was originally manufactured for the propulsion method, and when used for the above-mentioned construction method, the insertion opening 108b of the trailing tube is inserted into the receiving opening 108a of the preceding pipe, and the end surface of the receiving opening 108a and the insertion opening are inserted. The flange 115 provided on the outer peripheral surface of 108b is butted, and the bolts and nuts 116 provided at the butted portion are connected and joined.

Problems to be Solved by the Invention By the way, when carrying out the above-mentioned construction method, it is necessary to accurately lay a new pipe line along the existing pipe line or the pilot line line while correcting the direction by traction force. As a joint between the receiving port 108a side and the trailing tube insertion port 108b side of
A flexible joint (flexible joint) that can correct the direction is required.

However, since the joint of the pipe 108 has a rigid structure so as to prevent bending, even if some flexibility can be obtained by loosening the bolt nut 116,
It is not possible to expect great flexibility, and therefore it is not easy to correct the direction at the time of drawing and laying, and it is difficult to lay the pipeline of the new pipe accurately. In addition, if the ground changes greatly due to an earthquake or the like after installation, there is a problem that the pipelines are difficult to adapt to the geological changes.

Therefore, the present invention solves the problems of the conventional pipes described above, enables reliable pull-in transmission, and can be installed.
An object of the present invention is to provide a pipe for a pull-in method in which the direction of the pipeline can be easily corrected during and after installation.

Means for Solving the Problems In order to achieve the above-mentioned object, the present invention relates to a traction force transmission rod for transmitting a traction force by connecting a rear end face of a leading pipe of a sheath pipe and a front end face of a trailing pipe in a circumferential direction. A plurality of, one end of which is screwed and fixed to the screw portion provided on the rear end surface or the front end surface,
In addition, the other end is engaged with the engaging portion provided on the front end surface or the rear end surface so as to be movable in the axial direction and the radial direction.

Action According to the above configuration, the pulling force is transmitted from the leading pipe to the trailing pipe through the transmission rods of the plurality of exterior pipes that are pulled from the front by the winch or the like when the pulling-in is installed. Moreover, when transmitting the traction force, since the other end of the transmission rod is engaged with the engaging portion so as to be movable in the axial direction and the radial direction, the direction of the traction force can be corrected by a relatively large flexible soft member. A structural joint can be obtained, and the direction of the exterior pipe can be easily corrected during the pulling installation, and even if the geology changes due to an earthquake or the like after the installation, the installation pipeline can sufficiently adapt to this.

Embodiment 1 In FIG. 1, reference numeral 1 is a plurality of concrete exterior pipes as pipes for a pull-in method, which are manufactured from ductile cast iron pipes, for example. The outer pipe 1 has a pipe 2 such as a light-weight steel pipe on the outer peripheral side so that the outer diameter is equal in the axial direction and the outer surface is smooth, and a space between the pipe 2 and the iron pipe body 3 is an outer filling material such as mortar. 5 is filled. Exterior filler 5 is pipe 2
It is not filled up to the end on the insertion opening 1b side and stops at a position closer to the reception opening 1a side by a predetermined length from the end on the insertion opening side. A plurality of tap holes 7 as screw portions are formed in the end surface of the receiving port 1a of the outer tube 1 in the circumferential direction, and a male screw 10 provided at one end of the traction force transmitting rod 8 is screwed into the tap holes 7. ing.

On the other hand, in the end portion on the insertion opening 1b side of the exterior filling material 5, there is an engagement case 12 with which the engagement ball portion 11 provided at the other end of the transmission rod 8 engages, at the same position as the tap hole 7. , And are buried at the same intervals. The engagement case 12 has an uneven portion such as a protrusion on its outer peripheral surface for improving the close contact with the exterior filling material 5, and the transmission rod 8 is engaged with the wall surface on one end side facing the insertion opening 1b side. Other than the spherical portion 11, the engaging spherical portion 11 cannot be inserted and an elongated hole-shaped engaging hole 13 is formed. That is, as shown in FIGS. 2A and 2B, the outer diameter of the engaging ball portion 11 of the transmission rod 8 is a, the outer diameter other than the engaging ball portion 11 is b, and the lateral length of the engaging hole 13 is short. If the width in the direction (circumferential direction) is c, then a>
c> b.

A female screw hole 15 through which the engaging ball portion 11 can be inserted is formed on the other end surface of the engagement case 12 facing the side opposite to the insertion opening 1b.
15 has a male thread 17 provided on the outer peripheral surface at one end of a root 16 having an H-shaped cross section.
Are screwed together. The root 16 is detachably attached to the engagement case 12 by such screwing because the engagement ball portion 11 is engaged with the engagement hole 13 before the transmission rod 8 is embedded in the engagement case 12. This is because it is stored in the case 12. Therefore, if this is possible, other designs may be used. For example, after the engaging ball portion 11 of the transmission rod 8 is housed in the case 12 instead of the screwing method, the inner peripheral surface of the hole 15 and the root portion 16 are The outer peripheral surface may be welded. Further, in the above description, the engaging cases 12 are individually embedded in the exterior filling material 5, but the cases may be integrated in a ring shape and the integrated ring-shaped engaging case 12 may be embedded.

18 is formed at the end of the pipe 2 on the side of the insertion opening 1b, and is a window for inserting a finger or a tool of the hand when the male screw 10 of the transmission rod 8 is screwed into the tap hole 7, 20 is a watertight rubber ring, and 21 is Shows the interior lining.

In order to manufacture the pipe 1 in which the engagement case 12 is embedded in the exterior filling material 5, the pipe body 3 is placed with the receiving port 1a facing down as shown in FIG.
After standing upright, the pipe 2 is covered with the spacer 22 using the spacer 22, and the exterior filler 5 is filled between the two from above. When the filling material 5 is filled up to near the end of the pipe 2 on the insertion opening 1b side,
Before it solidifies, the transmission rod 8 is engaged in the end portion of the filler 5 on the insertion side, and the previously assembled engagement case 12 is embedded.
When the filler 5 is solidified and the tap hole 7 is formed on the end surface of the receiving port 1a, the manufacturing is completed.

The leading pipe and the trailing pipe of the pipe 1 as described above are provided on the trailing pipe insertion port 1b side after the trailing pipe insertion port 1b is inserted into the receiving port 1a of the leading pipe in a usual manner. Each of the transmission rods 8 is pulled out from the engaging case 12, and the male screw 10 of these transmission rods 8 is inserted into the receptacle 1a of the preceding pipe.
Screw it into the tap hole 7 provided on the side. This completes the joining.

FIG. 4 shows a modified example of the receiving port of the outer tube 1. In this modified example, a ring 25 is provided on the outer periphery of the receiving port 1a, the outer surface of which is flush with the outer surface of the pipe 2, and a substantially half part thereof is at the receiving port 1a end. It is fitted and fixed so as to project further rearward. A female thread is provided on the inner circumference of approximately half of the ring 25.
26 is provided, and this female screw 26 has a ring with tap holes 27
The male screw 29 provided on the outer periphery of the member 28 is screwed and attached.

FIG. 5 shows another modified example. In this modified example, the ring 25 and the ring 28 are integrated into one piece, and the divided piece 32 with the tap hole 31 is divided into a plurality of pieces in the circumferential direction. It is fitted and fixed to the outer periphery of. An annular step portion 33 is cut out at the end of the piece 32 on the insertion opening 1b side, and an integral ring 35 is arranged on the annular step portion 33, and is fixed to the piece 32 with a screw or the like.

In the case of the socket 1a of each of these modified examples, it is not necessary to provide a tap hole in the socket itself, so that the axial length of the socket is extended to provide the tap hole as in the example of FIG. Is no longer necessary, and the tube body that has been used conventionally can be used as it is.

FIG. 6 shows a modification of the transmission rod. In this modification, the transmission rod 37 is divided into a plurality of parts in the axial direction, and the divided ends are pins 38.
The transmission rod 37 itself is bendable.

In the case of the transmission rod 37 of this modified example, the flexibility of the joint is further improved as compared with the transmission rod 8 of the example of FIG.

FIG. 7 shows another embodiment of the present invention, which is basically different from the example of FIG. 1 in that the transmission rods 8 are arranged in opposite directions. That is, a plurality of screw members 41 with tap holes 40 are embedded in the end portion of the exterior filler 5 on the side of the insertion opening 1b in the circumferential direction, and the male screw 10 of the transmission rod 8 is inserted into the tap holes 40 of the screw members 41. It is screwed.

On the other hand, on the end surface of the receiving port 1a, the same number as the axial hole 44 for attaching the engaging ring 43 at the position corresponding to the tap hole 40,
Further, female threads 45 are formed at the same intervals, on the receiving end side of the axial hole 44, and an engaging ring 43 is attached to the female thread 45 and a male thread 46 provided on the outer periphery thereof is screwed to be attached. Has been.
The wall surface of the engagement ring 43 on the receiving end side is shown in FIG.
As shown in (B), although the transmission rod 8 can be inserted except for the engaging ball portion 11, an elongated hole-shaped engaging hole 47 which is engaged with the engaging ball portion 11 and cannot be inserted is provided.

In addition, it goes without saying that each of the above-described embodiments is merely an example, and it is needless to say that the design matters of the details can be appropriately modified and changed. For example, the portions where both ends of the traction force transmission rod are fixed or engaged are other than those shown in the drawings. Good.

EFFECTS OF THE INVENTION Since the present invention has the above-described structure, the traction force transmission rod can transmit the traction force of the leading pipe to the trailing pipe to reliably pull in the plurality of exterior pipes for installation. Also, since the other end of the traction force transmission rod engages with the engaging portion so that the transmission rod can move in the axial direction and the radial direction, a flexible joint having a large flexibility can be obtained. It is possible to easily adapt to the direction of the road and to adapt to ground changes after installation. Furthermore, since the pipe can be shipped while the other end of the traction force transmission rod is engaged with the engagement portion provided on the front end face of the trailing pipe or the rear end face of the preceding pipe, the transmission rod is in transit to the joining site. There is an excellent effect that parts are easily managed without being lost.

[Brief description of drawings]

1 is a vertical sectional front view showing an embodiment of the present invention, FIG. 2 (A) is an enlarged vertical sectional side view taken along the line AA of FIG. 1, and FIG. 1 (B) is an enlarged front view of a traction force transmission rod. Fig. 3 (A) is a vertical sectional front view for explaining the manufacturing process of the outer casing, Fig. 3 (B) is a plan view thereof, and Figs. 4 and 5 are vertical sectional front views showing a modification of the outer casing receiving port. FIG. 6 is a front view showing a modified example of the traction force transmission rod, FIG. 7 is a vertical sectional front view showing another embodiment, FIG. 8 (A) is an enlarged side view of the engagement ring, and FIG. Is a vertical sectional front view, FIG. 9 (A) is a schematic sectional view showing the PAP method, FIG. 9 (B) is a schematic sectional view showing the traction method, and FIG. 10 is a conventional method used in the method shown in FIG. FIG. 3 is a vertical sectional front view showing an example of the new pipe of FIG. 1 …… Concrete exterior pipe, 1a …… Receptacle 1b …… Inlet, 2 …… Pipe 3 …… Iron tube, 5 …… Exterior filler 7 …… Tap hole, 8 …… Trucking force transmission rod 10 …… Male thread, 11 ... Engaging ball part 12 ... Engaging case, 13 ... Engaging hole

Claims (1)

[Scope of utility model registration request] 1. A retraction in which a plurality of exterior pipes having outer diameters substantially equal to each other in the axial direction and whose outer surfaces are formed smooth are joined and laid by inserting a leading end portion of a trailing pipe into a rear end portion of the preceding pipe. In the pipe for construction method, a plurality of traction force transmission rods for connecting the rear end face of the preceding pipe of the exterior pipe and the front end face of the trailing pipe to transmit the traction force are provided in the circumferential direction, and screws provided on the rear end face or the front end face. For the pulling-in method, one end of which is screwed and fixed, and the other end is engaged with an engaging portion provided on the front end surface or the rear end surface so as to be movable in the axial direction and the radial direction. tube.