JP2787551B2 - Updating existing buried pipes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a renewal method for replacing old buried pipes, such as sewers, gas and telegraphs, which have been buried in the ground for many years, without replacing them with new pipes.

[0002]

2. Description of the Related Art Existing buried pipes that have been buried in the ground for many years have been deteriorated due to corrosion by sewage or soil, and it is necessary to replace existing buried pipes. As a simple method of updating an existing buried pipe, a new pipe is connected from one shaft to the end face of the existing buried pipe, and the end face of the new pipe is pressed by a hydraulic jack or the like, and the existing buried pipe is pushed out to the other shaft side. The way has been done. In this method, a hydraulic jack is installed in the shaft on the pushing side, a new pipe is connected to the end face of the existing buried pipe, the head of the hydraulic jack is brought into contact with the end face of the new pipe, and the hydraulic jack is extended for one pipe. When the existing buried pipe is pushed out to the other shaft and removed, the hydraulic jack is reduced and a new pipe is installed between the hydraulic jack and the existing buried pipe. Then, a hydraulic jack is brought into contact with the end face of the new pipe to extend the pipe, thereby sequentially replacing the existing buried pipe.

[0003] The force required for pushing out the existing buried pipe varies depending on the soil conditions and the diameter of the existing buried pipe, but it depends on the frictional force and adhesion between the outer periphery of the existing buried pipe and the surrounding ground. It grows in proportion to the extension, and a long extension update requires a very large punching force.

[0004]

According to the above-mentioned prior art renewal method, it is possible to replace an existing buried pipe with a new pipe without excavating the pipe, thereby avoiding road traffic obstacles and living environment. However, existing buried pipes
It has been a long time since the construction was completed, and the outer circumference of the existing buried pipe has been strongly tightened to the ground. The frictional and adhesive forces of the surrounding ground become very large, and the overall pushing force becomes large. For this reason, it is necessary to increase the number of main push equipment such as hydraulic jacks installed in the shaft, resulting in a large equipment cost.

[0005] Further, when the pushing force becomes large, a large pushing force also acts on the end face of the newly installed pipe, causing breakage and cracking of the end face, which may cause water leakage after embedding. Further, if the pushing force becomes larger and exceeds the axial load capacity of the new pipe, the existing buried pipe cannot be punched.

[0006] For this reason, the renewal method of pushing out an existing buried pipe is currently used only for construction in which the existing buried pipe is relatively short. Therefore, the present invention
An object of the present invention is to provide a method for updating an existing buried pipe to solve the above-mentioned problems.

[0007]

That is, according to the present invention, an inner wall surface of an existing buried pipe is fixed to an inner wall of the existing buried pipe by a telescopic member of a movable support arm provided on an outer periphery of a casing connected to the existing buried pipe. A process in which a certain amount of the existing buried pipe is pushed out through the casing by the push-out jack installed at the rear end, sequentially from the existing buried pipe on the tip pushing side, and a new pipe connected behind the existing buried pipe is installed at the rear end And a step of pushing the fixed amount by the pushing jack.

The length of each casing is made substantially the same as the length of the existing buried pipe, and the connection may be made by a bolt connection or the like according to the prior art. A groove is provided at a predetermined position in the middle part of the outer periphery of each casing so that one end of an expansion / contraction tool mounted on the support arm can be stored. The support arm is provided with a hydraulic jack or the like that can expand and contract in both directions. At the tip of the existing buried pipe-side telescopic device, in order to easily press against the inner wall of the existing buried pipe,
It is good to attach rubber etc.

[0009] The length of the existing buried pipe to be sequentially extruded from the punching side by a predetermined amount is set to the length of the steel collar attached to the outer periphery of the existing buried pipe connection part and, in the case of the C-shaped pipe, within the lap length of the joint. By doing so, it is possible to prevent the upper sand and groundwater in the surrounding ground from flowing into the pipe.

[0010]

According to the invention described above, the casing and the existing buried pipe are fixed by the extension of the telescopic member of the support arm, and the existing buried pipe is sequentially pushed through the existing buried pipe by a fixed amount one by one from the punching side. It is not necessary, and only a low push-out force acts on the new pipe, and the main push equipment such as a hydraulic jack installed in the shaft is also simplified.

The pushing force is always set to the existing buried pipe 1
It is only the frictional force and adhesive force of this part, and it is not affected by the extension of the existing buried pipe.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view illustrating a method for updating an existing buried pipe according to an embodiment of the present invention. In the existing buried pipe 7,
The casing 5 having substantially the same length as the existing buried pipe 7 is inserted from the vertical shaft 12 on the push-in side by joining flanges and the like (not shown), sequentially connected by bolts and nuts, and inserted. A groove 3 is provided at a predetermined position in the middle part of the outer periphery of each casing 5 so that one end of a telescopic device 2 mounted on the support arm 1 can be stored therein. The support arm 1 is equipped with a hydraulic jack or the like that can expand and contract in both directions perpendicular to the casing 2.
The support arm 1 is equipped with wheels 4 so that it can freely move around the outer periphery of the casing 5 and can be moved by wire pulling or a drive (not shown). Rubber or the like is attached to the distal end of the expansion / contraction tool 2 in order to make it easier to press against the existing buried pipe 7.
In the shaft 12 at the rear end of the casing 5, a push-out jack 10 for pushing out the casing 5 by a fixed amount is provided. A new pipe 9 is connected to the rear end of the existing buried pipe 7 in the shaft 12, and a push jack 11 for pushing the new pipe 9 by a fixed amount is provided on the rear end face of the new pipe 9. .

FIG. 2 is a cross-sectional view for explaining in detail how the support arm 1 is fixed to the casing 5. Existing buried pipe 7
The casing 5 is inserted in the inside. Two grooves 3 are provided at predetermined positions on the outer periphery of the casing 5. On the outer periphery of the casing 5, the support arm 1 is moved.
And the position of the groove 3 provided in the casing 5 is matched. Then, the casing 5 and the existing buried pipe 7 are fixed by extending the expansion / contraction tool 2. In this embodiment, the expansion and contraction device 2 of the support arm 1 is exemplified as two places, but the arrangement and the number of places can be increased or decreased depending on the diameter of the existing buried pipe 7 and soil conditions.

Next, a construction method using the apparatus for updating the existing buried pipe 7 of the present invention will be described. The position of the tip casing 5 is adjusted to the position of the existing buried pipe 7 on the punching side, and the support arm 1 is operated to move to the center of the tip casing 5. Then, the telescopic device 2 provided on the support arm 1 is extended, and is pressed against and fixed to the inner wall surface of the existing buried pipe 7 and the groove 3. Telescopic device 2
Is completed, the pushing jack 10 provided on the pushing shaft 12 is extended to push the casing 5. As the casing 5 moves forward, the distal end of the support
The existing buried pipe 7 fixed to the casing 5 advances together with the casing 5. The extension length of the push-out jack 10 is set so as to be within the steel collar length of the connection portion of the existing buried pipe 7 or the wrap length of the C-shaped pipe which was examined in advance.

When the push-out of the existing buried pipe 7 on the push-out side is completed, the push-out jack 10 is reduced and the casing 5 is moved backward so as to fit the existing buried pipe 7. As a method of moving the casing 5, a method in which the casing 5 is equipped with a driving device to be self-propelled, or a method in which the casing 5 is moved by using a push-out jack 10 provided in a rear end of the casing 5 may be used. When the movement of the casing 5 is completed, the support arm 1 is operated and moves to the intermediate portion of the existing buried pipe 7 that follows, the telescopic device 2 is extended, and the casing 5 and the existing buried pipe 7 are fixed. Then, the push-out jack 10 is extended, and the subsequent existing buried pipe 7 is pushed out until it comes into contact with the rear end face of the previous existing buried pipe 7. In this way, the existing buried pipe 7
Press out a certain amount at a time.

When the pushing out of the last existing buried pipe 7 is completed, the rear end face of the new pipe 9 connected to the last existing buried pipe 7 is pressed by the pushing jack 11, and the end face of the last existing buried pipe 7 is pushed. Push until it touches. As described above, the steps of sequentially pushing out the existing buried pipe 7 by a fixed amount from the existing buried pipe 7 on the pushing side and the step of pushing the new pipe 9 by a fixed amount up to the end face of the last existing buried pipe 7 are repeated. The existing buried pipe 7 can be easily renewed by removing the force.

In this embodiment, the method of sequentially pushing out the existing buried pipes 7 by a predetermined amount is described. However, when the pushing force is small depending on the soil condition and the diameter of the existing buried pipes 7, , Two or three pieces can be punched out at the same time. If the number of push-outs of the existing buried pipe 7 becomes smaller while repeating the above steps, and the pushing-out force and the pushing-in force of the new pipe 9 become smaller than the permissible axial load capacity of the new pipe 9, immediately after the new pipe 9 What is necessary is just to press an end surface.

[0018]

According to the method for renewing existing buried pipes of the present invention, the existing buried pipes are sequentially pushed out one by one from the punching side. The construction can be performed reliably without increasing the force.

Further, as described above, the existing buried pipes can be constructed one by one with a low punching force, so that the existing buried pipes are not damaged or cracked. In addition, the pushing force applied to the new pipe following the existing buried pipe row is only the outer peripheral frictional force and the adhesive force of the new pipe itself, so that the end face of the new pipe does not break or crack.

[0020]

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view illustrating a method for updating an existing buried pipe according to one embodiment of the present invention.

FIG. 2 is a transverse sectional view for explaining a support arm in detail.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Support arm 2 Telescopic device 3 Groove 4 Wheel of support arm 5 Casing 6 Wheel of casing 7 Existing buried pipe 8 Steel collar 9 New pipe 10 Push-out jack 11 Push-in jack 12 Vertical shaft

Claims (1)

(57) [Claims] 1. A method of renewing an existing buried pipe connected and buried in the ground, wherein an inner wall surface of the existing buried pipe and the casing are connected to each other by a telescopic member of a movable support arm provided on an outer periphery of a casing connected to the existing buried pipe. Fixedly extruding a predetermined amount of the existing buried pipe through the casing by a punching jack provided at the rear end of the casing, sequentially from the existing buried pipe on the tip pushing side, and a new connection connected to the rear of the existing buried pipe. And a step of pushing in the fixed amount by a pushing jack installed at a rear end of the pipe.