JP3398470B2 - Propulsion method and distance piece used for it - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a propulsion method and a distance piece used therein.

[0002]

2. Description of the Related Art Thrust is transmitted between a receptacle formed at the end of one tube and an insertion receptacle formed at the end of the other tube and inserted into the receptacle. , A propulsion method for propelling and laying these pipes underground is known.

5 and 6 show a joint structure of a ductile cast iron pipe for a propulsion method. One tube 1 as shown
A receiving port 2 is formed at the end of the pipe 1, and an insertion port 4 to be inserted into the receiving port 2 is formed at the end of the other pipe 3 joined to the pipe 1. An exterior concrete layer 5 is formed on the outer circumference of the body of the pipes 1 and 3 to reduce the propulsion resistance by making the outer diameter of the body equal to the outer diameter of the receiving port 2. Further, the mortar lining layer 7 is provided on the inner circumference of the pipes 1 and 3.
Are formed.

A sealing material pressure contact surface 8 is formed on the inner periphery of the receiving opening 2, and an annular sealing material 9 is arranged between the sealing material pressure contact surface 8 and the outer peripheral surface of the insertion opening 4. . A push ring 11 is applied to the sealing material 9 via a split ring 10.
As shown in FIG. 6, the head of the bolt 12 screwed out from the push ring 11 pushes the rear end surface 14 of the receiving port 2 via the connecting rod 13 to compress the sealing material 9.

A flange 16 having a reinforcing rib 15 is formed on the outer periphery of the insertion slot 4, and this flange 16 is usually the receptacle 2.
The thrust is transmitted between these sockets and outlets by contacting the end face of the.

However, when the thrust force suddenly rises for some reason or when the vehicle is propelled in a curve, a distance piece is interposed between the distal end surface of the insertion opening and the rear end surface of the receiving opening, so that the inner surface of the pipe is The thrust is transmitted between the insertion port and the receiving port on the side. Especially when driving a curve,
As shown in FIG. 5, a distance piece 17 is interposed between the rear end surface 14 of the receiving opening 2 and the push ring 11, and a wedge metal fitting 18 is arranged between the push ring 11 and the tip end surface of the insertion slot 4. , Mouth 4
The thrust is transmitted between the and the socket 2. Since the thickness of the wedge metal fitting 18 varies in the pipe axis direction along the circumferential direction, the joint portion can be bent according to the curvature of the curve to be propelled.

In the case of this curve propulsion, it is necessary to install the wedge metal fitting 18 at the beginning end of the curve in the middle of the propulsion path. Therefore, the opening device 21 shown in FIG. 6 is used to obtain a space required for installation.

The opening device 21 is provided with a hydraulic jack 23 at each tip of a plurality of radially extending telescopic arms 22. The hydraulic jack 23 has a base end side and a tip end side each having a radial outside. Claws 24 and 25 that project in the direction are provided.

The telescopic arm can be used to obtain space for installation.
By extending 22 the claws 24 and 25 are inserted between the insertion port 4 and the receiving port 2 where the wedge metal fitting 18, the distance piece 17 and the bolt 12 are not installed in the circumferential direction, and in that state the hydraulic jack 23 And operate one of the claws 24 to insert 4
And the other claw 25 on the back end face of the socket.
Apply to 14. And in that state, further hydraulic jack
The required installation space is formed by extending 23.

On the contrary, at the end of the curve, it is necessary to remove the distance piece 17 and the wedge metal fitting 18, but since these are strongly sandwiched between the insertion opening 4 and the receiving opening 2, the opening device 21 To open the joint and release the pinching force.

[0011]

However, in the case of using the opening device 21 as described above, since the opening device 21 is large, the workability is poor, and the restraining force of the pipes 1 and 3 is large depending on the working conditions. Therefore, there is a problem that the joint part may not be opened.

Therefore, the present invention solves such a problem, and attaches and detaches the distance piece and the wedge metal fitting without using a conventional large-scale opening device and without needing to open the joint portion. The purpose is to be able to.

[0013]

In order to achieve this object, the propulsion method of the present invention is to install these pipes between the receiving end of one pipe and the inserting end of the other pipe inserted into this receiving end. When transmitting the thrust for propelling into the ground, the distance between the pair of pieces is changed by operating the bolt of the distance piece in which the pair of pieces are connected by the bolt of the reverse screw to change the distance between the pair of pieces. After making the length of the distance piece in the axial direction correspond to the distance between the distal end surface of the insertion opening and the rear end surface of the receiving opening, place this distance piece between the distal end surface of the insertion opening and the rear end surface of the receiving opening. It is something to intervene.

The distance piece for propulsion method of the present invention is for propelling these pipes into the ground between the receiving end of one pipe and the inserting end of the other pipe inserted into this receiving end. When transmitting the thrust, the distance piece interposed between the distal end surface of the insertion opening and the rear end surface of the receiving opening is the first piece arranged on the distal end surface side of the insertion opening and the receiving piece. The second piece arranged on the rear end face side and the first and second pieces
And a bolt having a reverse thread in the tube axis direction for connecting the pieces to each other so that the length in the tube axis direction can be adjusted.

[0015]

With this structure, the length of the distance piece in the axial direction of the tube is adjusted by operating the bolt, so that the distance piece can be inserted between the receiving and inserting openings without opening the joint portion. To be dressed. Also, by operating the bolt of the distance piece interposed between the receiving and inserting openings to shorten the length in the axial direction of the pipe, the distance piece can be removed without opening the joint. . Therefore, it is not necessary to use a large-scale opening device as in the related art.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to FIGS. 1 to 4 by giving the same reference numerals to the same members as those shown in FIGS. . As shown in the figure, the distance piece 31 according to the present invention has a socket 2
A plurality of them are provided in the circumferential direction by selecting a position between the inner end face 14 and the push ring 11 that avoids the bolt 12.

Each distance piece 31 has a pair of rectangular parallelepiped pieces 32, and these pieces 32 are connected to each other by a pair of counter-screw bolts 33 in the tube axial direction. Each bolt 33 has a right-hand thread 34 at one end and a left-hand thread 35 at the other end, and a hexagonal portion 36 for engaging a tool is formed between the right-hand thread 34 and the left-hand thread 35. Has been done.

A pair of right inner threads 37 for screwing the right screw 34 of the bolt 33 is formed in one of the pair of pieces 32, and a left screw 35 of the bolt 33 is screwed in the other. Is formed with a pair of left inner threads 38.

According to such a configuration, the pair of pieces 32
By inserting a tool between them and engaging them with the hexagonal portion 36, and operating this tool, the bolt 33 can be rotated. Then, the bolt 33 has a right-hand thread 34 and a left-hand thread 35.
Since the bolts are formed, the rotation of the bolt 33 causes the pair of pieces 32 to move closer to or farther from each other.

When starting the curve propulsion at the time of propelling the pipes 1 and 3, a wedge metal fitting 18 is provided between the push ring 11 and the tip end surface of the insertion port 4, and the pair of pieces is rotated by the rotation of the bolt 33. 32 The distance piece 31 whose length is shorter than the gap between the rear end surface 14 of the receptacle 2 and the push ring 11 is inserted into the gap. Then, by rotating the bolt 33 in the opposite direction to move the pieces 32 away from each other, as shown in FIG. 1, one of the pair of pieces 32 is applied to the rear end surface 14 of the receptacle 2 and the other of them is applied. Apply to push ring 11.

Similarly, by installing a plurality of distance pieces 31 in the same manner in the circumferential direction, the distance piece 31 and the wedge metal fitting 18 can be formed without opening the joint portion.
And can be installed between the receiving and inserting ports, and the thrust can be easily transmitted on the inner surface side of the pipe.

When the end of the curve is reached, a tool is inserted between the two pieces 32 of the distance piece 31 to rotate the bolt 33, and the pieces 32 are brought close to each other to move in the pipe axial direction. If the length of is shortened, the wedge metal fitting 18 can be removed without opening the joint portion.

[0023]

As described above, according to the present invention, since the length of the distance piece in the axial direction of the pipe can be adjusted by operating the bolt, the joint portion can be opened without using a large-scale opening device. The distance piece can be inserted between the receiving openings and can be removed from the receiving openings.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a pipe joint portion using a distance piece for a propulsion method according to an embodiment of the present invention.

FIG. 2 is a diagram showing in detail a vertical cross section and a horizontal cross section of the distance piece in FIG.

FIG. 3 is a schematic perspective view of the distance piece.

FIG. 4 is a transverse cross-sectional view of a pipe joint portion showing an arrangement state of the distance piece.

FIG. 5 is a vertical cross-sectional view of a pipe joint portion using a conventional distance piece.

6 is a view showing an opening device for opening the pipe joint portion of FIG. 5 together with the pipe joint portion.

[Explanation of symbols]

2 mouth 4 mouth 31 distance piece 32 pieces 33 Reverse screw bolt

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) F16L 1/024 E21D 9/06

Claims (2)

(57) [Claims] 1. A propulsion method for transmitting thrust force for propelling these pipes into the ground between the receiving end of one pipe and the inserting end of the other pipe inserted into this receiving end, By changing the distance between the pair of pieces by operating the bolt of the distance piece in which the pair of pieces are connected by the bolt of the reverse screw, the length of the distance piece in the tube axis direction A propulsion method characterized in that the distance piece is made to correspond to the distance between the front end surface and the rear end surface of the receiving opening, and the distance piece is interposed between the front end surface of the insertion opening and the rear end surface of the receiving opening. 2. When the thrust for propelling these pipes into the ground is transmitted between the receiving opening of one pipe and the inserting opening of the other pipe inserted into this receiving opening, these insertion openings are provided. A distance piece interposed between the front end surface of the and the rear end surface of the receiving opening, the first piece being arranged on the front end surface side of the insertion opening,
It has a second piece arranged on the rear end surface side of the receiving port and a reverse threaded bolt for connecting the first and second pieces to each other in the tube axis direction, and has a length in the tube axis direction. Distance piece for propulsion method characterized in that the height is adjustable.