JP3470146B2 - Sheath tube type propulsion method and its driving force transmission 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 non-excavation propulsion method for burying fluid transportation pipes used for water supply, gas, sewerage, etc. underground and a seismic resistant propulsion force transmission device suitable for use in the same. Is.

[0002]

2. Description of the Related Art As one construction method for burying a fluid transportation pipe such as a ductile cast iron pipe, there is a sheath pipe method. This method is a method of propelling a reinforced concrete pipe or a steel pipe as a sheath pipe, and inserting a ductile cast iron pipe or the like into the sheath pipe, and it is widely adopted because it does not require excavation.

The pipe joint in the sheath type propulsion method which has been conventionally adopted is, for example, as shown in FIG. This joint 100 is called a PII type joint,
The receiving port 101, the insertion port 102, the lock ring 103, the set bolt 104, the rubber ring 105, and the like.

FIG. 14 shows an outline of the above-mentioned conventional sheath tube type propulsion construction method. In the existing pipe (sheath pipe) P'which is buried between the starting pit S and the reaching pit R, more than this is shown. Insert a new pipe P with a small diameter. A hydraulic jack J is installed at the start pit, the rear portion of the hydraulic jack abuts against the reaction force receiver H, and the front portion presses the new pipe P via the pushing angle B. The new pipe P is sequentially joined by inserting the insertion opening 102 at the tip end thereof into the receiving opening 101 at the rear end portion of the preceding new pipe, and is pushed into the existing pipe. A leading sled K is attached to the front end of the new pipe.

The new pipes P, ... Are joined in the following manner. First, the lock ring 103 and the rubber ring 105
To the inside of the mouth. After that, the hydraulic jack J is operated, the insertion port 102 is inserted into the receiving port 101, and the set bolt is tightened. As a result, the succeeding new pipe is joined to the rear part of the preceding new pipe whose rear end faces the start pit. When the following new pipe is joined, press it with the hydraulic jack J,
A series of joined pipes is advanced toward the reaching pit.
The propulsive force of the hydraulic jack is
It is transmitted by contact with the end surface of the lock ring groove 107. Although the new pipe is inserted into the existing pipe in FIG. 14, the method of inserting the new pipe into the sheath pipe of the propulsion work by the pipe-in-pipe method is also performed in the same manner.

Next, FIG. 12 shows an S-shaped joint. This S-shaped joint has a receptacle 2, an insertion opening 3, a lock ring 4, an insertion projection 5, and a backup, which have an opening with a deep recess. Ring 6, split ring 7, push ring 8, bolt / nut 9 (a,
b), the rubber ring 10 and the like. In this S-shaped joint, a rubber ring 10 that is a sealing material is mounted between the opening of the deep recess of the receiving opening 2 and the outer peripheral surface of the insertion opening 3.
A push ring 8 is formed by a plurality of bolts and nuts screwed to the end of the socket 3.
Is pressed from the rear side, whereby the rubber ring 10 is fixed via the split ring 7 by being pushed between the receiving opening and the outer peripheral surface of the opening. After the rubber ring is attached, the head of the bolt is in a state of protruding toward the rear of the push ring.

[0007]

In the case of the PII type joint, since the lock ring 103 and the end surface 107a of the lock ring groove 107 are in contact with each other after the pipe-in is completed, as shown in FIG. , The insertion opening 102 is the receiving opening 1
You cannot move in the direction 01. Therefore, there is a problem that the joint does not satisfy the performance as a seismic resistant pipe that needs to expand and contract in both directions. When a large pulling force acts on the joint due to an earthquake or the like, the lock ring 103 and the end face on the opposite side of the lock ring groove 107 are engaged with each other to exert a disengagement prevention force. S-type ductile tube used, SII
It is said that it can withstand the pulling force of half of that of the ductile type tube and the NS type ductile tube.

Further, in the case of the S-type joint, when the propulsion is completed, the tip of the insertion opening 3 is in contact with the rear end surface 2a of the receiving opening 2 as shown by the chain line in FIG. Therefore, when an earthquake occurs, it is possible to move in the pull-out direction and there is a margin for expansion, but it is not possible to move in the push-in direction. Therefore, even the S-shaped joint having the highest seismic performance has a problem in that it cannot fully exhibit its performance as a seismic resistant tube because there is no expansion / contraction amount on the pushing side. In addition,
In the pipe joint structure similar to S-type joint, it is inserted into the sheath tube by mounting the liner between the insert opening and the receptacle, by removing the upper Symbol liner after propulsion completion <br/>, push-in direction Has been proposed (Japanese Patent Application Laid-Open No. 10-29106).
-148290). However, this method has a problem that a work for removing the liner and a special removing device are required .

Therefore, an object of the present invention is to provide a construction method having a simple structure that does not require a special work for securing a pushing amount after completion of propulsion and can secure a sufficient expansion and contraction amount as a seismic resistant joint.

[0010]

In order to solve the above problems, the present invention employs the following configurations. That is, in the construction method according to the first aspect of the present invention, a sealing material mounted between the inner surface of the receiving opening and the outer peripheral surface of the insertion opening is attached to the receiving end surface by a plurality of bolts and nuts that are attached via a push ring. A pod type propulsion method using an S-shaped pipe joint that is pressed and fixed from the side, in which the annular propulsion force transmitting member that abuts the rear end of the bolt does not slip when transmitting propulsion force It is characterized in that it is fixed to the insertion port so that it slips when it acts, and the tube is pushed in while transmitting the propulsion force of the insertion port to the receiving side via the propulsion force transmission member and the bolt.

A propulsion force transmission device according to a second aspect of the present invention is a propulsion force transmission device attached to an S-shaped pipe joint for connecting pipes by fitting an insertion port and a reception port. A propulsive force transmitting member that abuts a rear end portion of a bolt that presses and fixes a sealing material, which is mounted between the inner surface of the opening of the inner recess of the mouth and the outer peripheral surface of the insertion opening from the rear via a push ring, and the propulsion member. The force transmitting member is capable of transmitting a propulsive force, and is provided with a fixing means for slippingly inserting and fixing the force transmitting member to the outer peripheral surface of the opening when a pushing force due to an earthquake acts.

Further, by providing the propulsive force transmitting member with a roller protruding in the radial direction of the tube, the insertion tube can be easily inserted and a core for supporting the insertion tube in the central portion of the sheath tube. The centering becomes easy, and it is not necessary to separately provide a centering member. Further, the roller can reduce the resistance at the time of propelling the pipe.

Even if there are stones or steps on the bottom of the sheath tube, the front lower corner of the projecting piece to which the above-mentioned roller is attached is obliquely formed into a warp shape so as to have a function as a warp. You can get over it,
There is no problem in promoting the insertion tube.

According to the present invention, the propulsion force can be transmitted to the preceding pipe through the propulsion force transmission member and the bolt for fixing the sealing material during the propulsion when the pipe is inserted, so that the propulsion of the pipe can be efficiently performed. It can be carried out. After the end of propulsion, the propulsion force transmission member remains as it is, but when a large pushing force is applied due to an earthquake, slip occurs between the propulsion force transmission member and the insertion slot, and the insertion slot moves in the pushing direction. Since it can be moved, no excessive force is applied to the pipe itself or the joint. In addition,
The margin in the pulling direction is the same as before, so
It is possible to obtain a buried pipe with excellent earthquake resistance.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a detailed description will be given based on an embodiment of the present invention shown in the drawings. 1 to 5
Represents a structure of a pipe joint provided with a propulsion force transmission device according to the present invention. The pipe joint 1 is an S-shaped joint that is usually used as a seismic joint for waterworks. As shown, it comprises a socket 2 and an insert 3. The insertion opening 3 is integrally provided with an insertion opening projection 5 on the outer peripheral surface of the distal end portion of the ductile tube. When a large pulling force acts on the pipe joint due to an earthquake or the like, the insertion opening projection 5 and the lock ring 4 are engaged with each other, so that the insertion opening 3 is prevented from coming out of the receiving opening 2. The insertion port projection 5 is provided in a ring shape on the entire outer peripheral portion of the insertion port 3.

The receiving port 2 is formed by expanding the diameter of the rear part of the ductile tube into a generally funnel shape, and its opening is formed as a tapered hole 2b with a deep recess. A lock ring groove 12 is provided in the inner surface portion on the inner side of the tapered hole portion 2b over the entire circumference, and a lock ring 4 which is divided into ones and freely made is fitted therein. The rear end surface of the receiving port 2 is formed as a flat surface 13 perpendicular to the axial direction, and screw holes 13a for screwing bolts are provided on this surface. This screw hole 1
The bolts 9 inserted into the through holes of the push ring 8 are attached to 3a, ....
(A), ... Are screwed together. A nut 9 (b) is screwed on the rear side of the push wheel 8.

A rubber ring 10 as a sealing material is attached to the inner surface of the opening of the recessed portion of the receiving opening 2 and the outer peripheral portion of the insertion opening 3. This rubber ring 10 is formed in a shape along the inner surface of the opening of the receiving port 2, a split ring 7 is applied to the rear part thereof, and a push ring 8 is arranged at the rear part of the split ring. As described above, the bolt 9 (a) is inserted into the push ring 8, and the nut 9 (b) is screwed behind the bolt 9 (a). Therefore, when the bolt is tightened, the push ring 8 is pushed forward and the split ring 7 is inserted. The rubber ring 10 is pushed into the gap between the tapered hole 2b of the receiving port 2 and the outer peripheral surface of the insertion port 3. A backup ring 6 is arranged at the tip of the rubber ring 10. The backup ring protects the rubber ring 10.

A propulsive force transmitting member 25 for transmitting a propulsive force and fixing means for fixing the propulsive force transmitting member 25 to the outer peripheral surface of the insertion slot 3 are provided on the outer peripheral portion of the insertion slot 3. Propulsion force transmission member 25
As shown in FIGS. 2 and 3, radial projections 26a, 26a are provided at both ends, and a flange 26b is provided at the front edge.
, Which are integrally formed with each other, are fastened to each other with bolts 27, ... And nuts 27a ,. The bolts 27, ... And the nuts 27a, .. are fixing means of the propulsion force transmission member 25. By this fastening, the propulsion force transmission member 25 transmits the propulsion force to the preceding pipe at the time of propulsion, and a huge force due to an earthquake acts. When it does, it is fixed to the outer peripheral portion of the insertion slot 3 so as to slip. In addition, this propulsion force transmission member 25
Is a material having elasticity and an appropriate strength such that it can be moved along the outer circumference of the insertion slot by tightening the bolts 27, ... And the nuts 27a ,.
It can be made of wood.

The propulsive force transmitting member 25 in the illustrated example is a pair of ring pieces 26 (A, A) having the same shape as shown in FIG.
And a ring piece 26 (B) smaller than these (see FIGS. 4 and 5). Small ring piece 26
(B) is arranged at the lowermost side, and its protruding piece 26
a, 26a and the adjacent large ring piece 26 (A,
A roller (caster) 30 is attached between the protruding piece of A). As the material of this roller, SS material or FCD material can be used similarly to the propulsive force transmitting member. The outer surface of the roller may be provided with a resin lining or a rubber lining. 6 (a) and 6 (b) show this roller 30. As shown in FIG. 6 (c), this roller 30 has a through hole 31 provided in the roller and a bolt 32 on the protruding piece. It is attached to the projecting piece by inserting through and tightening with the nut 32a. This roller rolls on the inner surface of the sheath, and the provision of this roller significantly reduces propulsion resistance.

Further, the front lower corners of the protruding pieces 26a, ... Of the ring piece are slanted obliquely. In this way, if the protruding pieces 26a, 26a are formed so as to function as sleds, the insertion tube can be lifted and propelled from the bottom of the sheath tube, so there are stones or steps on the bottom of the sheath tube. But it will be easier to get over it. If a member that can lift the insertion tube is provided like the roller 30 and the sled 26c, another supporting member for supporting the tube is not required, and the insertion tube is supported at the center of the sheath tube. The centering of is also easy.

During the propulsion work of the pipe P provided with this propulsion force transmission device, as shown in FIG. 7A, the push ring 8, the rubber ring 10, the backup ring 6, and the lock ring 4 are provided on the outer peripheral portion of the insertion port 3. Deposit in the order of and insert into the receiving slot 2. The insertion depth of the insertion slot 3 at this time is a distance L between the tip 3a of the insertion slot 3 and the receiving end surface 2a, as shown in FIG.
The depth is defined as the remaining (pushing margin). The amount L of indentation is about 1% of the length of the pipe. Next, the split ring 7 is mounted between the push ring 8 and the rubber ring 10, and the nut 9b screwed to the bolt 9a is tightened. As a result, the push wheel 8 is moved to the socket 2
The rubber ring 10 that is pushed to the side and is a sealing material via the split ring 7.
The pressing force acts on.

When the insertion opening 3 is inserted and the rubber ring 10 is completely attached, the propulsive force transmitting member 25 is attached to the front surface of the flange portion 26b of the bolt 9 (a) for pressing the rubber ring as shown in FIG. ) Attach so that it touches the rear end. This mounting method is as described above. In this case, since the work of joining the pipes and securing the amount of expansion and contraction of the joints can be all performed on the outer surface side of the pipes, the present invention can be applied to pipes having a diameter of less than 800 mm that a worker cannot enter inside.

After the pipe P is joined by the S-shaped joint according to the above procedure, the jack J is operated to push the pipe P into the sheath P '. At the time of this push-in, the thrust applied to the rear end of the insertion slot 3 is transmitted from the propulsion force transmission member 25 to the preceding pipe through the bolt for fixing the sealing material to propel it. Therefore, the propulsive force transmitting member 25 needs to be firmly fixed to the insertion port 3 so as not to slip due to this thrust. However, when a huge pushing force is applied due to an earthquake, the insertion opening 3 causes the propulsive force transmitting member 25 to move.
On the other hand, since it must slip, it is not preferable to fix it by welding or the like.

While the insertion tube P is being pushed in, the sled 26c provided on the propulsion force transmitting member 25 and the rotating roller 30 roll on the inner surface of the sheath tube P'while supporting the insertion tube.
Requires less propulsion resistance. Also, the insertion tube is lifted and held near the center of the sheath tube. On the other hand, even if there is a large step or bend, the sled 26c comes into contact with the inner surface of the sheath and thus does not hinder the propulsion work.

Further, even if there are obstacles such as stones or steps on the traveling orbit of the roller 30, it is possible to easily get over them by the sled 26c, and the propulsive force is increased or propelled by the obstacles of this kind. There is little danger of an impossible situation.

In the state in which the propulsion of the pipe is completed, FIG.
As shown in FIG. 5, the propulsive force transmitting member 25 is attached to the outer peripheral portion of the insertion slot 3 with the pushing margin amount L left. On the other hand, when an earthquake occurs and a strong pushing force acts, a slip occurs between the propulsion force transmitting member 25 and the insertion opening 2, as shown in FIG.
The insertion port 3 is pushed into the receiving port 2. At this time, the amount of margin for pushing is the distance L until the tip of the insertion port 3 contacts the rear end surface 2a of the receiving port 2, so that it can sufficiently cope with a normal earthquake.

Further, when a large pulling force acts on the pipe joint due to an earthquake or the like, as shown in FIG.
Since the protrusion 5 of the insertion slot 3 can move in the pull-out direction until it comes into contact with the lock ring 4, it is possible to adapt to the external force in this direction.

Next, FIGS. 9 and 10 illustrate an embodiment different from the above. In this embodiment, the propulsive force transmitting member 25 'has four ring pieces 26', which have the same shape and size.
... are bolted together. Also in this case, the roller 30 is provided in the space between the lowermost protruding pieces. Thus, if as many ring pieces as possible have the same shape and size, the number of molding dies and the like can be reduced, the parts management is easy, and it is economical.

FIG. 11 illustrates a further different embodiment, in which a cushioning material (for example, expanded polystyrene) 35 is interposed between the propulsive force transmitting member 25 and the bolt 9 (a), so that curving is promoted. In this case, even if the propulsive force concentrates on one bolt, it can be dispersed to other bolts. Therefore, by including such a cushion material, the safety of the pipe joint in terms of water stopping performance is improved.

[0030]

As is apparent from the above description, according to the present invention, it is possible to transmit the propulsive force necessary for the insertion tube inserted into the sheath tube, and further, after the propulsion is completed, a large force due to an earthquake or the like is generated. When a pushing force is applied, a slip occurs between the propulsion force transmitting member and the insertion opening, and the insertion opening is pushed into the receiving opening. The nature has come to be obtained.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a pipe joint portion illustrating an embodiment of the present invention.

FIG. 2 is an external view of FIG.

FIG. 3 is a sectional view taken along line XX in FIG.

FIG. 4 is a partial sectional front view (a) and side view (b) of a ring piece 26 (A).

FIG. 5 is a front view (a) and a side view (b) of a partial cross section of a ring piece 26 (B).

6A is a sectional view of the roller 30 and FIG. 6B is a front view thereof, and FIG. 6C is an external view of a bolt / nut supporting the roller.

FIG. 7 is an explanatory diagram of an assembling method.

FIG. 8 is an explanatory diagram of a stretched state.

FIG. 9 is an external view of a different embodiment of the present invention.

10 is a sectional view taken along line YY of FIG. 9.

FIG. 11 is a sectional view showing still another embodiment of the present invention.

FIG. 12 is a sectional view of a conventional PII type joint.

FIG. 13 is a sectional view of a conventional S-shaped joint.

FIG. 14 is an explanatory diagram of a pipe-in-pipe propulsion method.

[Explanation of symbols]

1 Pipe fitting 2 mouth 3 outlet 4 lock ring 5 protrusions 6 backup ring 7 split ring 8 push ring 9 Bolt (a) and nut (b) 10 Rubber ring (seal material) 25 Propulsion force transmission member 26c sled 27 volts 30 Laura

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Naoki Tomita 1-12-19 Kitahorie, Nishi-ku, Osaka City, Osaka Prefecture Kurimoto Iron Works Co., Ltd. (56) Reference JP-A-51-102219 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) F16L 1/024 F16L 21/00

Claims (5)

(57) [Claims] 1. A plurality of bolts (9 (a)) having a sealing member (10) mounted between the inner surface of the opening of the receiving opening (2) and the outer peripheral surface of the inserting opening (3) fixed to the end surface of the receiving opening. And nut (9
In (b), S is pressed and fixed from the rear side through the push ring (8).
A pod type propulsion method using a shaped pipe joint, wherein an annular propulsion force transmitting member (25) is in contact with the rear end of the bolt.
Is fixed to the insertion opening (3) so as not to slip when transmitting the propulsive force but to slip when a large pushing force due to an earthquake acts, and the propulsive force of the insertion opening is provided through the propulsion force transmitting member and the bolt. The sheath-tube propulsion method, characterized in that the pipe is pushed in while transmitting to the receiving side. 2. A propulsion force transmission device attached to an S-shaped pipe joint for connecting pipes by fitting an insertion opening (3) and a receiving opening (2), wherein the depth of the receiving opening is reduced. Force for abutting the rear end of the bolt (9 (a)) for pressing and fixing the sealing material (10) mounted between the inner surface of the opening of the and the outer peripheral surface of the insertion opening from the rear via the push ring (8) A transmission member (25), and a fixing means (27) capable of transmitting the propulsive force and capable of slipping when the pushing force due to an earthquake acts and fixing the propulsive force to the outer peripheral surface of the opening. Propulsion force transmission device. 3. The propulsive force transmitting member (25) is composed of a plurality of arc-shaped members (26), and the plurality of arc-shaped members are annularly arranged on the outer peripheral portion of the insertion port (3) and are mutually bolted (2).
The propulsion force transmission device according to claim 2, wherein the propulsion force transmission member is fixed to the insertion port by fastening in 7). 4. The propulsion force transmission device according to claim 2, wherein the propulsion force transmission member (25) is provided with a roller (30) rolling on the inner surface of the sheath tube (P ′). 5. The propulsion force transmission device according to claim 2, wherein the propulsion force transmission member (25) is provided with a projecting piece (26a) which is formed in a warp shape and projects in the radial direction of the pipe. .