JPH0341283A - Buried pipe removal method - Google Patents

Abstract

PURPOSE:To make it possible to certainly pull out a buried pipe which is integral with a steel bar to one side of a pit by inserting the steel bar into the existing buried pipe in the ground and charging adhesive reinforcement into the buried pipe and firmly integrating them. CONSTITUTION:Steel bars 10A through 10F are connected to each other in order in a pit 4 through joint members 11 making a steel bar 10, which is inserted into a buried pipe 3, into which adhesive reinforcement 12 is charged. After the solidification of the adhesive reinforcement 12, the buried pipe 3 and adhesive reinforcement 12 are integrally pulled out toward either the pit 4 or 5 through the steel bar 10, and then the adhesive reinforcement 12 pulled out is broken to pieces near the joint members 11 of the steel bar 10 to expose the steel bar 10, and then the connections of the joint members 11 are disconnected to take back the steel bar 10 from the interior of the buried pipe 3. In such manner buried pipes are certainly pulled out to one of the two pits, and steel bars can be easily taken back in pits.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method for removing buried pipes, and more specifically, removes the ends of buried pipes without digging up the topsoil of the buried location. This relates to a construction method in which the existing pipe is pulled out into a pit formed at a location where the existing pipe is crushed and cut.

[Conventional technology]

Protection pipes for domestic water, gas, and electricity piping and communication cables will be buried underground, while road construction will also proceed. In such cases, the above-mentioned protection pipes are often buried across or along the road. The buried pipe may be, for example, a cast iron pipe or a ceramic pipe with a length of about 3 m, but in either case, the openings at both ends are connected to other pipes to form a continuous sealed space.

If such underground pipes are used underground for a long period of time, they will deteriorate, so it is necessary to pull out the existing pipes and backfill the space, or replace them with new pipes as necessary. In that case, two small pits are formed with an interval between them where the existing buried pipe is located, and the existing pipe between the pits is pulled out into one of the pits, in a place that does not cause too much of a hindrance to the passage of vehicles. There is.

As an example of taking out existing pipes, JP-A-55-99
There is a conduit continuous exchange device described in Japanese Patent No. 61. According to this device, it is possible to remove buried pipes and bury new pipes while preserving the shape of old ceramic pipes, etc., without excavating from the road. That is, the traction rods on which the spacer-cum-anchors protrude are connected to make a long one, and are inserted into the buried pipe from the pull-out side pit to the opposing pit. Then, collar stoppers to prevent concrete from flowing out are attached to both ends of the buried pipe, and concrete is supplied around the tow rod to fill the inside of the buried pipe.

When this concrete hardens, the buried pipe, which has become fragile, will be reinforced, and the buried pipe will be integrated with the anchored tow rod. Pull out the buried pipe while towing the towing rod with the center hole jack in the pull-out side pit, and push the new pipe in from the push-in side pit with the push jack.

- Once the new pipe is pushed in, the push jack is removed, the new pipe is connected and the same operation is repeated, removing the buried pipe and laying the new pipe. Note that if the new pipe is not buried, the space left after the buried pipe is pulled out will be backfilled with soil.

[Problem to be solved by the invention] By the way, the pull-out side pit and the push-in side pit have sides of 3 to 4.
It is a narrow space of about m. Jack into the drawer side pit
Once the length of the stroke has been drawn out, it is sized so that it can be removed from a narrow space by smashing the part and carrying it to the ground in a bucket. Post-processing of such buried pipes requires time and effort in a narrow pit, and furthermore, all the processed material becomes industrial waste, which increases the cost of pulling out the buried pipes. Improvement is desired.

The present invention was made to solve the above-mentioned problems.
The purpose is to ensure that the buried pipes are removed and to reuse some of the materials used during removal.
It is an object of the present invention to provide a method for removing buried pipes, which facilitates transport to the ground, improves efficiency of buried pipe removal work, and reduces costs required for the work.

[Means to solve the problem]

The buried pipe removal method of the present invention involves pulling out an existing buried pipe 3 buried underground 2 into one of pits 4 and 5 formed at its front and rear ends 3a and 3b, and removing the buried pipe 3 from the ground. Applicable to construction methods in which the material is removed sequentially from the inside.

The feature is that, as shown in FIG. 1, steel rods 10A to IOF are sequentially connected using a joint member 11 in a pit 4, and the connected steel rod IO is inserted into a buried pipe 3. Step: A process of filling adhesive reinforcing material 12 into the buried pipe 3 through which the connected long steel rod 10 passes vertically.After the filled adhesive reinforcing material 12 is solidified, it is poured into one side of the pit 4.5. , steel bar 1
0, the buried pipe 3 and the adhesive reinforcing material 12 are drawn out into one of the pits 4, and the buried pipe 3 and the adhesive reinforcing material 12 are pulled out from the joint member 11 of the steel bar 10.
The method includes a step of crushing the steel rod 10 near the joint member 11 and exposing the steel rod 10 (see FIG. 16), and a step of disconnecting the steel rod 11 at the joint member 11 and recovering the steel rod 10 from the buried pipe 3. That's true.

In the second invention, the buried pipe 3, adhesive reinforcing material 12, and steel rod 10 pulled out into one of the pits 4 are cut into an integral block 18 (see FIG. 20) within the pit 4. This is because it has a process of

〔Effect of the invention〕

According to the present invention, the steel rod inserted into the buried pipe is firmly integrated with the buried pipe through the adhesive reinforcing material filled in the buried pipe, ensuring that the buried pipe integrated with the steel rod goes to one side of the pit. can be pulled out. Further, in one of the pits, the buried pipe and adhesive reinforcing material are crushed in the vicinity of the joint member of the steel rod to expose the steel rod, so that the steel rod can be recovered at the joint member.

According to the second invention, the buried pipe, adhesive reinforcing material, and steel rod are cut into an integrated block in one pit, so that one block after cutting can be easily carried from the narrow pit to the ground. It can be carried out, making the buried pipe removal work more efficient.

〔Example〕

EMBODIMENT OF THE INVENTION Hereinafter, the buried pipe removal apparatus to which the buried pipe removal method of this invention is applied will be described in detail based on the Example. As shown in Fig. 1, the underground pipe 3 laid underground 2 is made up of a plurality of ceramic pipes 38 to 3F connected to each other with a length of approximately 3 m, and is connected to the outside of the opening on the large diameter side. The diameter is, for example, 170 mm, the body diameter is approximately 95 mm, and an appropriate number of communication cables are inserted into the inside. Usually, the buried pipe 3 is divided at intervals of about 40 m in length, and the front and rear ends 3a and 3b are
Vertical pits 4 and 5 with a diameter of approximately 1.5 m are formed, and above them are manholes 6 and 7 through which necessary equipment can be taken out.
is provided. These manholes 6.7 are located on the road surface 8 such as a roadway or sidewalk, or are installed at a location away from the road.

The buried pipe removal device l has a hydraulic jack 9 attached to the wall surface 4a of the pull-out pit 4, which is one of the pits.
9, a plurality of short steel rods 10A to IOF are connected by a joint member 11 and pull a long steel rod 10 inserted through the inside of the buried pipe 3. There is a delivery pump device 13 that supplies an adhesive reinforcing material 12 such as fresh concrete or mortar from one of the pits (pit 4 in the figure) into the buried pipe 3, and the other pit 5 has a cylindrical protruding member 1.
The buried pipe 3 is fitted inside the cone body 15 integrated with the buried pipe 3.
An impact type propulsion machine ■6 is installed to push the.

An adhesive reinforcing material 17 such as a bond is filled between the protruding member 14 and the base end 3 of the buried pipe 3 to firmly adhere the two. Most of the space in the buried pipe 3 is filled with the above-mentioned adhesive reinforcing material 12 which has lower adhesive strength than the adhesive reinforcing material 17 but is cheaper.

The cone body 15 shown in FIG. 2 has a conical front end base and a cylindrical rear end, and has a conical space inside which fits and accommodates the front half of the impact type propulsion device 16 (see FIG. 1). 15a is formed. A protruding member 14 is integrated with the tip of the cone body 15 by welding. The diameter of the front surface 15b of the front end base is made slightly larger than the body diameter of the buried pipe 3 (see FIG. 3), so that the impact force of the impact type propulsion device 16 can be easily transmitted through the cone body 15.

An adhesive reinforcing material 12 is attached to the front end base of the cone body 15.
An air vent hole 15c necessary for filling is opened.

The protruding member 14 is a cylinder having a diameter and length of about 800 mm so as to have an even gap space with respect to the inner diameter of the buried pipe 3. When removing the buried pipe 3, the protruding member 14
A semi-liquid adhesive reinforcing material 17 with high adhesive strength is applied in advance to the outer surface of the pipe and the inner surface of the buried pipe 3F. On the other hand, a part of the wall surface 5a of the other pit 5 buried underground 2 is excavated.
[See Figure 1] A left and right split type gauge 19 [See Figure 2], which will be removed later, is attached to the outer peripheral end of the exposed buried pipe 3F, and the protruding member of the cone body 15 is guided by the gauge 19. 14 is inserted concentrically into the buried pipe 3F together with the adhesive reinforcing material 17 as shown in FIG. Incidentally, if you do not want the impact force of the impact propulsion device 16 to be applied directly to the buried pipe 3, as shown in FIG.
The diameter of the front surface 15b of 5 may be made slightly smaller than the inner diameter of the buried pipe 3, and the pushing force may be applied via the adhesive reinforcing material 17.

In this way, when the adhesive reinforcing material 17 uniformly applied to the inner surface of the buried pipe 3F and the outer surface of the protruding member 14 hardens, the buried pipe 3F and the protruding member 14 are integrated with extremely strong bonding force. Ru. That is, the impact force of the impact propulsion device 16 when the buried pipe 3 is removed is transmitted to the entire buried pipe 3 via the adhesive reinforcing material 17 and the adhesive reinforcing material 12.

Instead of the above-mentioned air vent hole 15c, as shown in FIGS. 5 and 6, an air vent pipe 20 passing through the front end base of the cone body 15 and the adhesive reinforcing material 17 may be installed in advance.Furthermore, as shown in FIGS. In place of the above-mentioned cylindrical protruding member 14, a cylindrical protruding member 21 shown in FIG. 7 may be used and an air vent pipe 20 may be attached.In short,
It is sufficient that the air inside the buried pipe 3 does not obstruct entry into the buried pipe 3 when filling the adhesive reinforcing material 12.

FIG. 8 shows an example in which a ring 22 made of soft resin or rubber that can absorb the impact force of the impact propulsion device 16 to some extent is attached to the front end of the cylindrical protruding member 14.

This is because when the adhesive reinforcing material 17 is injected from the bond injection port 23 drilled in the upper part of the cone body 15 after the cone body 15 is brought into contact with the rear end 3b of the buried pipe 3F, the bond is injected excessively. Regulations are in place to prevent this from happening. A plurality of air vent holes 22a are provided around the ring 22 to ensure smooth bond injection.

The short steel rods 10A-10F in this example are cut into lengths of about 3 m, for example, and have threaded ribs 24 as shown in FIGS. 9 to 11 formed thereon.

The joint member 11 that connects the steel rod 10 is, as shown in FIGS. 12 and 13, a NAND member with a female thread 11a carved inside, and a pin penetrating the screw space in the center thereof. The shaft 11b is inserted and fixed, for example, a steel rod 10A screwed in from one side and a steel rod 10 screwed in from the other side.
B is connected to the pin shaft 11b so as to be adjacent thereto.

As mentioned above, before removing the buried pipe 3 laid underground 2 shown in FIG. , are fixed with adhesive reinforcing material 17. Subsequently, in one pit 4, another steel rod 10E is screwed into the joint member 11 screwed onto one end of the short steel rod 10F, and they are inserted into the empty buried pipe 3 as one body. If the spacer 25 attached to the steel rod 10F is inserted while sliding at the bottom of the buried pipe 3, the steel rod 10 will be located approximately at the center of the buried pipe 3. Short steel rods are connected and inserted one after another, and when one end of the steel rod 10A remains in the pit 4, the insertion of the steel rod 10 is stopped.

Note that the above-mentioned steel rod 10F is not directly connected to the protruding member 14, and care is taken so that the impact force from the impact type propulsion device 16 is not directly transmitted to the steel rod IO.

An adhesive reinforcing material 12 such as mortar is supplied from a delivery pump device 13 on the ground through a pipe 13a that enters the manhole 6 into the buried pipe 3 that is closed with a cover member 3C. During this filling operation, air is released from the air vent hole 15c,
The mortar 12 is filled inside the buried pipe 3 and the protruding member 14 . When a portion of the mortar 12 comes out from the air vent hole 15c, filling is stopped and the mortar is solidified and cured in that state.

By solidifying the mortar 12, the cone body 15 and the steel rod 10
Furthermore, all the buried pipes 3 are integrated. Hydraulic jacks 9.9 are attached to the wall surface 4a of the focus 4, and both jacks 9, 9 and the end of the steel rod 10A are connected via a pull-out member 26, and as the jacks 9.9 are extended, The buried pipe 3 is pulled out together with the steel rod 10 into the pit 4 by static traction force.

When the extension of one stroke of the jacks 9, 9 is completed, the jacks 9, 9 are reduced, and the connection between the steel rod 10A and the pull-out member 26 is released.
An interpolation material (not shown) is interposed between the wall surface 4a of the pit 4 and the base of the jack 99. Pulling out is repeated with the extension of the jack 9.9, and the first joint member 11 and steel rod 10 are
The work of pulling out the buried pipe 3A continues until a part of the pipe B comes out into the pit 4. During this pulling operation, the impact force of the impact propulsion device 16 is transmitted from the cone body 15 to the buried pipe 3 via the adhesive reinforcing material 12 or the adhesive reinforcing material 17, promoting the separation of the buried pipe 3 from the surrounding topsoil. be done. The impact type propulsion unit 16 is connected to a ground compressor (not shown) via piping, and the supply of compressed air can be switched using an internal control valve. The reciprocating movement of the impactor generates impact force and pushing force on the cone body 15. Although the pushing force by this impact type propulsion device 16 is not large, it is a repetitive load, and the jack 9
Combined with the static traction force, this effectively contributes to pulling out the buried pipe 3.

Although the mortar 12 is filled from the pit 4, it may be fed from the other pit 5 if necessary.

For example, a mounting hole 27a as shown in FIG. 14 is provided, the tip of the injection pipe 27 is screwed in, and the mortar 12 is injected into the buried pipe 3.

If air vent holes 28 are provided in the lid members 3C of the four pits, filling with the mortar 12 can be performed smoothly.

Remove the jack 9.9 attached to the wall 4a,
As shown in FIG. 15, the triangular marks on the outer periphery of the buried pipes 3A and 3B are successively smashed with a hammer or the like. Buried pipe 3A
, 3B and the mortar 12 are removed, while the steel rod 1
0A, IOB and joint member 11 are exposed [16th
See figure]. At that time, buried pipes 3A, 3B and mortar 12
Fragments and other debris are placed in a waste bucket (not shown) and transported to the ground.

The steel rod 10A is removed from the joint member 11, and the steel rod 10A
A short steel rod 10G is attached in place of this [see Figure 17]. This steel rod 10G is attached to the pull-out member 26, and the subsequent buried pipes 3B to 3F and steel rods 10B to IOF are pulled out. In addition, there is no need to connect steel bar 10G to steel bar 10B.
Insert the tip of the nut 26a [first
If the joint member 1 can be fixed with
Furthermore, as shown in FIG. The buried pipe 3A may be removed at this point.

Instead of smashing the buried pipe 3 with a hammer as described above, a hydraulic crusher 29 shown in FIG. 19 may be used to crush the portions marked with triangles in FIG. 15. The main body member 29A of this crusher 29 has left and right cutters 3QA.
, 30B are rotatably supported by bottle shafts 29a and 29b, and a hydraulic cylinder 31 is mounted on the upper part of the main body member 29A.
By the expansion and contraction operation of the double-sided vines 30A and 30B, the opening and closing are made. While holding the handle 29B, place it so that it straddles the buried pipe 3, and as shown in the figure,
If a pipe is provided, cracks are made in advance in the buried pipe 3, and then the pipe is crushed or crushed with the cutting part of the cutter.

After the final buried pipe 3F is removed and the steel rod 10F is recovered by repeating the above-mentioned pulling out operation, soil and the like are backfilled. In some cases, a new pipe (not shown) may be connected to the rear of the impact type propulsion device 16 and laid at the same time as the buried pipe is pulled out.

Incidentally, in this example, an adhesive reinforcing material 17 such as a bond is inserted into the base end 3K of the buried pipe 3 to strengthen the integration between the protruding member 14 of the cone body 15 and the buried pipe 3F, and the impact type propulsion device 16 This prevents the buried pipe 3 from collapsing due to the impact force transmitted from the pipe. Although bond is more expensive than mortar or the like, it is effective in strongly reinforcing areas that are subjected to strong impact force from the impact type propulsion device 16. Note that bond is extremely sticky and difficult to fill into long buried pipes 3, making it impossible to reuse the injection pump and piping system, so we decided to use bond. As mentioned above, mortar 12 or the like is used in places where it is not necessary to do so. Of course, it is not absolutely necessary to use bond, so the adhesive reinforcing material 17 may not be used and only the mortar 12 may be filled into the buried pipe 3.

On the other hand, when the impact type propulsion device 16 is used, an extremely large extrusion effect is exhibited during the initial extraction of the buried pipe, but the jack 9
．． The present invention can also be applied to the case where the buried pipe 3 is pulled out using only the traction force by the pipe 9.

In the above explanation, the case where the steel rod 10 is recovered from the buried pipe 3 that has been pulled out has been described, but as shown in FIG. After pulling out the pipe 3A from the wall 4a, remove the jack 9 (see Figure 1) attached to the wall 4a, and remove the rotary blade cutter 3 from the buried pipe 3A at a position slightly away from the wall 4a.
It is also possible to cut it by 3 as shown in FIG.

The cut block 18 is an integral body of the buried pipe 3A, the adhesive reinforcing material 12, and the short steel rod 10A, and the manhole 6
A rope was lowered from the crane, which lifted it up and carried it to the ground.

After being cut as shown in FIG. 21, a part of the buried pipe 3A remaining in the pit 4 and protruding and the adhesive reinforcing material 12 are broken at the broken line, and the steel bar 10A is fixed to the nine-out member 26. , the same drawing operation will be continued thereafter. In this way,
Since the underground pipe 3 is pulled out to the pit 4 together with the steel rod 10 and treated all at once, the extraction work including the post-processing of the buried pipe 3 can be made more efficient.

[Brief explanation of drawings]

Fig. 1 is a schematic configuration diagram of the buried pipe removal device, Figs. 2 and 3 are explanatory diagrams of the connection between the buried pipe and the protruding member, Fig. 4 is a diagram of installing the cone body with a small front diameter, and Fig. 5 is 6 is a sectional view taken along the line VI-Vl in FIG. 5; FIG. 7 is a sectional view of a connection using a cylindrical protruding member; Figure 8 is a sectional view of the connection part when it has a ring, Figure 9 is a partial front view of the steel rod, Figure 10 is a view taken along the line X-X in Figure 9, and Figure 11 is a view taken along the line XI in Figure 9. -XI
12 is a cross-sectional view taken along the line, FIG. 12 is an external view of the joint member, and FIG. 13 is a cross-sectional view taken along line XI-XI in FIG. , FIG. 15 is a sectional view of the buried pipe pulled out into the focus, FIGS. 16 and 17
The figure is an explanatory diagram of the state of the steel bar after the buried pipe is crushed, Figure 18 is an explanatory diagram of the state when the buried pipe is partially crushed, Figure 19 is a front view of the crusher, and Figure 20 is the state of the steel bar pulled out into the pit. FIG. 21 is a cross-sectional view of the case where the buried pipe is cut, and FIG. 21 is an explanatory diagram of the state after the buried pipe is cut. 2-Underground, 3.3A ~ 3F-Buried pipe, 3a-Front end, 3
b-rear end, 4--pit (drawer side pit), 5--pit, 10. IOA~10F--steel rod, 11--joint member, 12-adhesive reinforcing material (fresh concrete, mortar)
, 18...Block.

Claims (2)

[Claims] (1) In this construction method, an existing underground pipe is pulled out into one of the pits formed at the front and rear ends of the pipe, and the buried pipe is sequentially removed from the ground using a joint member inside the pit. The process of connecting steel bars one after another and inserting the connected steel bars into a buried pipe, the process of filling an adhesive reinforcing material into a buried pipe through which the connected long steel bars pass vertically, and the process of filling the filled pipe with adhesive reinforcement. After the adhesive reinforcing material has solidified, a step of pulling out the buried pipe and the adhesive reinforcing material together through the steel rod into one of the pits; It is characterized by comprising the steps of crushing the steel rod in the vicinity of the joint member and exposing the steel rod, and disconnecting the steel rod at the joint member and recovering the steel rod from the buried pipe. Buried pipe removal method. (2) Instead of the step of exposing the steel rod and the step of recovering the steel rod from the buried pipe in claim 1, the buried pipe pulled out into one of the pits, the adhesive reinforcing material, and the steel rod are A buried pipe removal method characterized by the process of cutting into integral blocks within a pit.