JPH10183655A - Manhole replacement method and double casing used for the method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce construction time period until the opening of a road to traffic by quickening manhole replacement work by pressing a casing in ground for separating an existing manhole from the ground and by using the casing for retaining earth when placing a new manhole thereafter. SOLUTION: A casing sufficiently large for surrounding a manhole is pressed in the ground, and the manhole member is separated from the adjacent earth. After releasing the joints between a manhole lid receiving frame, sloped walls 3 and straight walls 35, or by raising the whole of the manhole, the manhole member is taken out and removed. The pressed casing is used as an earth retaining member when installing a new manhole. If double casing is used, the separation from the ground can be done more certainly and the removal can be made easier.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for quickly and quickly replacing an existing manhole, for example, a slope wall portion.

[0002]

2. Description of the Related Art Manholes that have been built and aged
Concrete is damaged by the load of passing vehicles, frost heave phenomenon in cold regions, groundwater, and corrosive components contained in sewage in the case of sewer manholes, requiring repair or replacement.

However, under the present circumstances, the surrounding area of the manhole was excavated, soil was applied to expose the replacement part of the manhole, and the damaged old part was removed and replaced with a new part. In this conventional construction method, excavation and subsequent earth retaining are required, so that it takes two to four days to complete the manhole replacement work, during which the road of the construction part has to be restricted.

[0004]

In the conventional method of replacing manholes, it is necessary to occupy a part of the road required for the replacement work and to restrict traffic, and it takes time to open the traffic. Was inconvenient.

The present invention has been developed with the objective of overcoming this drawback, exchanging manholes in a short time, and opening the traffic as short as possible.

[Means for Solving the Problems]

[0006] The casing is press-fitted so as to enclose the manhole, and the surrounding ground of the manhole and the edge of the manhole are cut off by press-fitting the casing, so that the existing manhole member can be easily removed. Is used as a retaining member to assemble and construct a new manhole member so that replacement of the manhole can be achieved in a short time.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction sequence will be described with reference to FIG. In this embodiment, a manhole composed of a sloping wall 3 and a straight wall 35 will be described by taking removal and replacement of the sloping wall 3 as an example. First, as shown in A, the center position of the manhole is measured and obtained.

[0008] A cut is made at a diameter slightly larger than the diameter of the straight wall portion of the manhole as shown in B by a circular cutter (not shown) in accordance with the measured center position, and a casing press-fitting guide 1 is provided. This cut cuts the pavement plate in the depth direction. The cutting depth should be the whole pavement plate,
Alternatively, the depth may be sufficient to serve as a guide for the casing. When the casing press-fitting machine has a strong ability, the casing can be directly press-fitted without forming the guide cut.

[0009] The cutting chips and the like generated during the cutting of the guide 1 are cleaned. Next, as shown in C, the manhole cover receiving frame 4 is inserted into the Japanese Patent Publication No. 61-25844 and Japanese Patent Publication No. 61-3393.
No. 8, using a method described in Japanese Patent Laid-Open No. H8 (1994), a hydraulic breaker 6 is cut between the sloping wall 3 and the receiving frame 4, the receiving frame and the sloping wall are separated, and the manhole cover receiving frame 4 is joined together with the surrounding paving plate 5. And remove it. As a method of removing the receiving frame, another method, for example, a method of pulling up while crushing or breaking around the receiving frame may be used.

[0010] As shown in D, a casing 2 is set in a guide 1 provided with a circular cutter and press-fitted. The reaction force of press-fitting may be obtained by adding a weight to the own weight of a press-fitting machine (not shown), or by using an existing manhole itself as an anchor and using the manhole itself as a reaction force member. Take the reaction force.

In case that the ground is hard and the reaction force is expected to be insufficient, a spare weight is attached to the base of the press-fitting machine so that the casing can be press-fitted smoothly. I do. Depending on the properties of the ground, any one of rotation, swing and vibration or a combination thereof is added to the casing to promote the press-fitting of the casing 2.

This embodiment is an example in which a double casing is used as a casing. As shown in FIG. 2, the double casing 21 includes an outer casing 25 and an inner casing 26 detachably fixed inside the outer casing 25.
A circular cutter 23 having a serrated blade 24 is provided at a lower portion of the outer casing. The diameter of the outer casing 25 may be smaller than the diameter of the cutter 23, and the cutter 23 may protrude outside the outer casing 25 to serve as a friction cutter 27, or the cutter 23 may be provided at the lower end of the outer casing 25 with the same diameter. Good.

An inner casing 26 is provided on a step 28 provided on the cutter 23.
Are fixed to the outer casing 25 with bolts 22 via a lubricating layer of asphalt, grease or the like, and are integrated. The inner casing 26 does not come into contact with the ground because the space of the ground formed by cutting the ground by the cutter 23 sinks together with the outer casing. Even if the lower end of the inner casing 26 is in a free state without providing the step portion 28, there is no particular influence on the press-fitting of the casing.

The inner casing 26 is a double casing 2
After laying down, 1 is lifted together with the slope, which is a manhole member to be removed. By simultaneously pulling up the members to be removed, such as the inner casing 26 and the sloping wall 3, it becomes easy to cut off the member to be removed and the ground, and the removal can be performed smoothly.

After the existing manhole member is removed, the press-fitted casing 2 is used as an earth retaining member and works inside the casing. Therefore, as shown in E, the lower end of the manhole member to be replaced, as shown in FIG. The casing 2 is press-fitted to a position deeper than the lower end of the sloping wall 3, and after the existing old sloping wall 3 is removed, the casing is inserted so as not to move due to earth pressure or the like.

As shown in E, the joint between the inclined wall 3 and the straight wall 35 is disengaged by engaging the hydraulic rupture machine 6 in the same manner as when the receiving frame 4 is removed, as shown in F. The part is pulled up and removed, and the removal process is completed as shown in G.

To remove the sloping wall 3, as shown in FIG. 3, the frame 8 is fitted into a concave portion 29 provided at the upper end of the casing and fixed so as not to move.
Is suspended from the frame 8. The lifting assisting member 10 having an end surface that matches the inclination of the wall of the sloping wall 3 is inclined and lowered into the manhole, and is leveled to bring the end surface of the auxiliary member 10 into contact with the wall surface of the sloping wall member. The slope wall 3 is pulled up using the chain block 9 and removed together with the inner casing 26.

As shown in FIG. 3H, the new slope wall 31 is connected to the straight wall 3.
Then, the outer casing 25 is removed by setting the upper part 2 and joining them together, sealing the joint so as not to cause water leakage.

Finally, as shown in I, the roadbed and the roadbed are backfilled, a receiving frame 41 is installed at the upper end of the new sloping wall 31, the mortar 7 is filled in the removed roadbed, and the surrounding area is covered with the road surface. Rolling is performed so that there is no step with the above, and the construction is completed.

[0020]

According to the present invention, the manhole and the surrounding ground are trimmed and soiled by using a casing, so no separate earthing work is required, and since there is no excavation work, the construction is speeded up and the manhole is removed. In addition, there is an advantage that the replacement work can be performed in a short time, and the time for occupying the road and limiting the traffic can be reduced.

[Brief description of the drawings]

FIG. 1 is a process chart of an embodiment of sloping wall replacement.

FIG. 2 is a detailed view when the slope is lifted.

FIG. 3 is a partially broken sectional view of a double casing.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Guide 2 Casing 21 Double casing 22 Bolt 23 Cutter 24 Serrated blade 25 Outer casing 26 Inner casing 29 Depression 3 Sloping wall 35 Straight wall 4 Manhole cover receiving frame 5 Paving plate 6 Breaker 7 Mortar 8 Frame 9 Chain block 10 Auxiliary member

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Katsuya Sato, Inventor 2-88, Hirono-cho, Uji-shi, Kyoto (72) Inventor, Yu Murase 345-2-401, Uchigochi-cho, Hachioji-shi, Tokyo

Claims (7)

[Claims] 1. A method for replacing a manhole, comprising press-fitting a casing so as to surround the manhole, cutting an edge between the manhole and the ground, and removing an existing manhole. 2. The method according to claim 1, wherein the casing is press-fitted by applying any one of swing, rotation and vibration to the casing. 3. The method for replacing manholes according to claim 1, wherein the casing is a double casing, and the existing manhole is pulled up and removed together with the inner casing. 4. The method for replacing manholes according to claim 1, wherein the casing is deepened below the removing member, and after removing the existing manhole, the manhole is used as a retaining member. 5. The manhole replacing method according to claim 1, wherein the manhole cover receiving frame is removed, and then the inclined wall portion is removed. 6. A double casing for manhole replacement, comprising a double casing for manhole replacement, comprising an outer casing and an inner casing detachably fixed inside the outer casing, and a cutter provided at a lower portion of the outer casing. casing. 7. The double casing for manhole replacement according to claim 6, wherein a lubricating layer is provided between the inner casing and the outer casing.