JP3489804B2 - New and old pipe replacement laying method and its equipment by non-cutting of gas supply pipe - 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 an apparatus for replacing an existing gas supply pipe, which is a steel pipe or a cast iron pipe, with a synthetic resin pipe.

[0002]

2. Description of the Related Art When a conventional existing gas supply pipe is replaced with a new gas supply pipe, since the entire replacement section is opened and cut, problems such as traffic obstacles and earthworks costs occur. Therefore, as a method of replacing the old and new pipes by non-opening, hard holes are drilled at both ends of the replacement section, the old and new pipes are connected in one hole, and the old pipe is pulled out by inserting a hydraulic drawing device into the other hole. However, a construction method has been proposed in which the new pipe is replaced by pulling it in (Japanese Patent Laid-Open No. 64-39418).

However, in the above-mentioned known example, since the pulling-out device uses hydraulic pressure, it is necessary to bring a hydraulic motor, a hydraulic cylinder, or a control mechanism into a working hole. is necessary. For this reason, it is not suitable for replacement of a lead-in pipe in a general house or work in a narrow space, and it is not one in which a worker can easily replace a new pipe with a new pipe. Further, the working hole requires a large excavation because a hydraulic machine can be inserted therein, and a lot of earthwork cost is required for the excavation and backfilling.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for replacing old and new pipes and a device for the same, which allows non-opening and exchanging old and new pipes manually by an operator and also reduces earthwork costs as much as possible. Is to provide.

[0005]

The construction method for replacing the old and new pipes by the non-opening of the gas supply pipe provided by the present invention and the structure of the apparatus are as follows.

1. Exchanging the soil at both ends of the replacement laying section until the existing gas supply pipe is exposed to dig the pull-in side vertical hole and the pull-side vertical hole, set the pulling device using the chain block in the pulling-side vertical hole, Connect the chain of the set chain block to the existing gas supply pipe using a pipe holder.Introduce the tip of the synthetic resin pipe into the pull-in tight hole, connect the universal joint to this synthetic resin pipe, and connect the existing gas supply pipe. Connect the connection adapter to, and connect the connection adapter and the universal joint, by driving the chain block in the traction vertical hole, to pull the existing gas supply pipe, the synthetic resin into the hole where the existing gas supply pipe is pulled out. Pull in the pipe, cut the root of the existing gas supply pipe that has been pulled after pulling the length allowed within the pulling vertical hole, and hold the pipe again at this cut portion. Set, and pull out the existing gas supply pipe with the chain block again while pulling in the synthetic resin pipe, and by repeating this, the synthetic resin pipe is replaced in the hole in which the existing gas supply pipe was buried. New and old pipe replacement laying method by non-open cutting of pipes.

2. A vertical reaction force receiving frame is formed on the front side of the horizontal base frame, and a fixing plate with a U-shaped groove for fixing the chain block is planted at the center of the rear side of the horizontal base frame. A traction device body, a chain block detachably set from above in a U-shaped groove of the device body, and a hole into which an existing gas supply pipe is inserted are formed in the center, and a wedge groove is formed in a part of this hole. A pipe holder consisting of a ring-shaped holder main body provided with a plurality of fixing screws directed toward the center and a wedge with an engagement ring driven into the wedge groove, and a synthetic resin pipe at one end. A universal joint having a connection part and a connection adapter connection part formed at the other end, and a connection having a connection part for the existing gas supply pipe formed at one end and a connection part for the connection adapter formed at the other end. Consisting of an adapter Old pipe replacement laying apparatus according trenchless gas supply pipe.

3. The connection adapter described in 2 above,
A connection screw is formed in the connection portion with the existing gas supply pipe, and the screw formed on the outside of the existing gas supply pipe is configured to be screwed into the connection screw for connection. New and old pipe replacement laying equipment by non-open cutting of the supply pipe.

4. The connection adapter described in the above 2 is formed with an insertion part with a fixing hole to be inserted into the inner surface of the existing gas supply pipe, and after inserting the insertion part into the existing gas supply pipe, The old and new pipe replacement laying equipment by non-opening of the gas supply pipe, characterized in that it can be fixed to the existing gas supply pipe by inserting a fixing pin from the adapter fixing hole opened on the side surface.

5. The connection adapter described in 3 above is a laying device for replacing a new and old pipe by non-excavation of a gas supply pipe, wherein an auxiliary groove for tightening is formed on an outer peripheral surface of a connection portion of an existing gas supply pipe.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention is applied when the old pipe is a steel pipe or a cast iron pipe and the new pipe is a synthetic resin pipe. The target is a relatively small scale, and the target is a lead-in pipe from a main pipe laid on a road to a house. The working groove will only be drilled with vertical holes at both ends of the replacement section.

Then, the pulling device is lowered into the vertical hole to pull out the old pipe to which the synthetic resin pipe is connected using the chain block, so that one worker can perform the replacement work. Therefore, the hard hole may be small. on the other hand,
Since the hard hole on the opposite side is simply connected to the synthetic resin pipe to the old pipe, it may be large enough for one worker to enter.
Further, in the case of a synthetic resin pipe, since it bends well, even if the diameter of the vertical hole is small, it is possible to work without much resistance.

The connection between the traction device and the old pipe is fixed by using a wedge so as to be as simple as possible, and the connection between the old pipe and the synthetic resin pipe is made as simple as possible. Only use universal joints and connection adapters.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the concept of the method of the present invention. In FIG. 1, 1 is a pull-side vertical hole, 2 is a pull-in side vertical hole,
Reference numeral 3 is an existing gas supply pipe, and 4 is a traction device incorporated in the traction side vertical hole 1. The traction device 4 vertically stands on a horizontal base frame 5 and the front side thereof as shown in FIG. The raised reaction force receiving frame 6, and a vertically movable tube holding rod 7 with a holding metal fitting 7a attached to the lower end attached to the center of the reaction force receiving frame 6.
And a U-shaped groove 8a raised in the rear center of the base frame 5
It comprises a chain block fixing plate 8 attached thereto and a chain block 9 set in the U-shaped groove 8a of the chain block fixing plate 8 from above. In the figure, 10 is a hook, 11 is a chain, and 12 is a handle.

Reference numeral 13 denotes a holding metal fitting, which is a holding metal fitting 1.
As shown in FIG. 3, the ring 3 has a hole 15 formed in the center of the ring 14 into which the existing gas supply pipe 3 is inserted, and a wedge groove 16 is formed in a part of the inner surface of the hole 15 to form a screw directed toward the center. Hole 1
7, 17a, 17b and these screw holes 17, 17a, 17
It consists of fixing screws 18, 18a and 18b screwed into b. Reference numeral 19 is a wedge, and 20 is an engagement ring attached to the wedge 19.

FIG. 4 is an explanatory view showing a state where the holding metal fitting 13 is attached to the existing gas supply pipe 3 and the holding metal fitting 13 is tightened to the existing gas supply pipe 3 by using the wedge 19. 21 is a connection adapter, and this adapter 21 is shown in FIG.
As shown in (A) and (B), a connection screw 22 with a universal joint is formed at the tip, a connection screw hole 23 with the existing gas supply pipe 3 is formed in the rear, and a rotation auxiliary groove 24 is formed on the outer periphery. It is the formed structure. The adapter 21 has a threaded portion remaining in the existing gas supply pipe 3. If the adapter 21 does not have a threaded portion, the adapter 21 is shown in FIGS. 6 (A) and 6 (B) (sectional view taken along the line AA '). As described above, the insertion portion 25 with the adapter fixing hole 26 is formed on the connection side with the existing gas supply pipe 3, and after the insertion portion 25 is inserted into the existing gas supply pipe 3, the fixing pin 27 is attached to the existing gas. You may make it fix by inserting in the adapter fixing hole 26 from the fixing hole 3a provided in the supply pipe 3 side.

Reference numeral 28 is a universal joint, and as shown in FIG. 7, this joint connects a connecting member 29 having a synthetic resin pipe connecting screw portion 29a, and an intermediate member 30 to the connecting member 29 by a pin 31. Further, after that, the adapter connection member 33 is connected by the pin 32, and the connection screw hole 34 is formed in the adapter-connection member 33. Figure 8
FIG. 7 is an explanatory diagram showing a state in which the existing gas supply pipe 3 and the synthetic resin pipe 35 are connected using the connection adapter 21 and the universal joint 28.

Next, a method for laying new pipes and replacing pipes using the apparatus according to the above embodiment will be described with reference to FIG. a. The traction side vertical hole 1 and the pull-in side vertical hole 2 are dug at the branch point (A) and the site (B) from the main branch pipe 36 on the road, respectively. b. The existing gas supply pipe 3 is cut in the vertical holes 1 and 2, respectively.

C. To the existing gas supply pipe 3 in the vertical hole 2, the synthetic resin pipe 3 through the connection adapter 21 and the universal joint 28.
Connect 5. d. A traction device 4 for pulling the existing gas supply pipe 3 is set in the vertical hole 1. e. The holding metal fitting 13 is fixed to the existing gas supply pipe 3 in the vertical hole 1 using the wedge 19 (see FIG. 4), and the chain block 9 is set in the U-shaped groove 8a of the chain block fixing plate 8 of the traction device body 4.

F. The hook 10 of the chain block 9 is hooked on the engagement ring 20 of the wedge 19. g. When the handle 12 of the chain block 9 is driven to pull the existing gas supply pipe 3, the existing gas supply pipe 3 is cut with a cutter or the like when pulled to about 50 cm per step. Thereafter, e, f, and g are repeated. h. The new synthetic resin pipe 35 is smoothly guided into the hole drawn from the existing gas supply pipe 3, and eventually reaches the vertical hole 1. i. The connection of the replaced synthetic resin pipe 35 and the existing buried pipe in the vertical holes 1 and 2 is performed by a conventional technique (method of connecting a steel pipe and a resin pipe).

[0021]

According to the present invention, since the old and new pipes are drawn and laid by using the construction method and apparatus as described above, the following effects can be obtained. Since it is possible to replace old and new pipes by hand without using a hydraulic machine, it is particularly applicable to service pipes of general houses. Working time can be significantly reduced. Since the excavated area is small, the generation of waste such as residual soil can be minimized. Since the excavated area is small, traffic obstacles associated with construction can be greatly reduced. Since the excavated area is small, it is possible to prevent the soil from collapsing during replacement work.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a new and old pipe retraction installation method performed by using the device of the present invention.

FIG. 2 is a perspective view of a towing device.

FIG. 3 is an explanatory view of a pipe holder and a wedge.

FIG. 4 is an explanatory view showing a state where a pipe holder is attached to an existing gas supply pipe.

FIG. 5 is an explanatory diagram of a connection adapter.

FIG. 6 is an explanatory view of another embodiment of the connection adapter.

FIG. 7 is an explanatory view of a universal joint.

FIG. 8 is an explanatory diagram of a usage example of a universal joint and a connection adapter.

[Explanation of symbols]

1 Towing side vertical hole 2 Recessed side vertical hole 3 Existing gas supply pipe 3a fixing hole 4 Traction device 5 base frames 6 Reaction force receiving frame 7 Pipe retainer 8 Chain block fixing plate 9 Chain block 10 hooks 11 chains 12 handles 13 Holding bracket 14 ring 15 holes 16 wedge groove 17, 17a, 17b Screw holes 18, 18a, 18b Fixing screw 19 wedge 20 engagement ring 21 Connection adapter 22 Connection screw 23 Connection screw hole 24 rotation auxiliary groove 25 Insert 26 Adapter fixing hole 27 fixing pin 28 Universal 29 Connection member 30 Intermediate member 31, 32 pin 33 Adapter connection member 34 screw holes 35 synthetic resin tube 36 branch pipes

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

Claims (5)

(57) [Claims] 1. The excavation of soil at both ends of the replacement laying section until the existing gas supply pipe is exposed to dig a pull-in side vertical hole and a pull-side vertical hole. A pulling device using a chain block is set in the pull-side vertical hole. , Connect the chain of the chain block set in this traction device and the existing gas supply pipe using the pipe holder, introduce the tip of the synthetic resin pipe into the retracted rigid hole, and connect the universal joint to this synthetic resin pipe Along with connecting the connection adapter to the existing gas supply pipe, and connecting this connection adapter and the universal joint, by driving the chain block in the traction vertical hole, the existing gas supply pipe is pulled and this existing gas supply pipe is pulled out. The synthetic resin pipe was pulled into the hole, and the length of the tow allowed in the vertical hole was cut.The base of the existing gas supply pipe that had been pulled was cut and cut again. Set the pipe holder on the part and pull the synthetic gas pipe while pulling out the existing gas supply pipe again with the chain block, and by repeating this, replace the synthetic resin pipe in the hole where the existing gas supply pipe was buried. A new construction method for replacing old and new pipes by non-open cutting of the gas supply pipe. 2. A vertical reaction force receiving frame is formed on the front side of the horizontal base frame, and a fixing plate with a U-shaped groove for fixing the chain block is provided at the center of the rear side of the horizontal base frame. The traction device body that is planted, the chain block that is detachably set from above in the U-shaped groove of the device body, and the hole into which the existing gas supply pipe is inserted are formed in the center, and one of the holes is formed. While providing a wedge groove in the portion, a ring-shaped holder main body formed by attaching a plurality of fixing screws toward the center direction, and a wedge with an engaging ring driven into the wedge groove,
And a universal joint having a synthetic resin pipe connection at one end and a connection adapter connection at the other end, and a connection for the existing gas supply pipe at one end and the other end at the other end. A connection adapter formed by forming a connection portion for the connection adapter, and a new and old pipe replacement laying device by non-open cutting of a gas supply pipe. 3. The connection adapter according to claim 2,
A connection screw is formed in the connection portion with the existing gas supply pipe, and a screw formed on the outside of the existing gas supply pipe is configured to be screwed into the connection screw for connection. New and old pipe replacement laying equipment by non-open cutting of the supply pipe. 4. The connection adapter according to claim 2, wherein an insertion portion with a fixing hole to be inserted into the inner surface of the existing gas supply pipe is formed, and after the insertion portion is inserted into the existing gas supply pipe. The old and new pipe replacement laying equipment by non-opening of the gas supply pipe, characterized in that the fixing pin is inserted from an adapter fixing hole formed on the side surface of the existing gas supply pipe so as to be fixed to the existing gas supply pipe. 5. The connection adapter according to claim 3, wherein an auxiliary groove for tightening is formed on the outer peripheral surface of the connection portion of the existing gas supply pipe, the old and new by non-opening of the gas supply pipe. Pipe replacement laying device.