JPH09165767A - Device technology for adjusting height of cover for manhall therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate readjustment after the completion of the execution of works by using a sponge material, in which a coil spring is contained, as an elastic body for adjusting the height of a manhole cover. SOLUTION: Adjusting bolts 10 are disposed in upright at a plurality of places on the top faces of upper concrete blocks 3, and elastic bodies 12 are inserted to the adjusting bolts 10. The elastic bodies 12 are inserted to the adjusting bolts 10 so that the diametrical expanding sections of coil springs 12b are positioned at upper sections. An inner mold 6 is disposed, washers are inserted to the adjusting bolts 10, and inserting holes 4b bored to the flange section 4a of a cover receiving frame 4 are put into the adjusting bolts 10 and the cover receiving frame 4 is set. Adjusting nut 11 are screwed to the adjusting bolts 10, the quantities of the adjusting nuts 11 screwed are adjusted and the height of a cover is controlled so that a manhole cover 5 coincides with a road surface while shrinking the elastic bodies 12. An outer mold 7 is arranged, and the clearance of height adjustment is filled with mortar.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manhole cover receiving frame height adjusting device and method for adjusting a height of a manhole cover receiving frame when a manhole is constructed under a road.

[0002]

2. Description of the Related Art Conventionally, when building a manhole under a road,
The lid portion of the manhole needs to be adjusted up and down according to the inclination of the road surface, etc. Therefore, various construction methods or adjusting devices for adjusting the height of the lid receiving frame of the manhole have been proposed.

As an example thereof, Japanese Patent Laid-Open No. 62-24871.
There is known one using an adjusting bolt as described in Japanese Patent Publication No. As shown in FIG. 7, a plurality of height adjusting bolts 54 are erected on the upper surface of the manhole upper portion 53 of the manhole main body 52 provided by excavating the roadbed 51, and the adjusting nuts 55 are attached to the adjusting bolts 54. The lid receiving frame 56 is installed on the adjusting nut by screwing. Then, the screwing amount of the adjusting nut 55 is adjusted so that the lid receiving frame 56 has a predetermined height and inclination, and the lid receiving frame 56 is fixed by the fixing nut 57. After that, the upper surface of the manhole upper portion 53 and the lid receiving frame 56
The concrete 58 is poured into the adjustment gap formed between and to solidify.

As another example, JP-A-2-28252
There is known one using an elastic body such as a spring for height adjustment as described in Japanese Patent Publication No. As shown in FIG. 8, this is an upper concrete block 61 of a manhole.
The fixing bolt 62 is erected on the
The coil spring 63 is inserted, and the bolt hole of the flange portion 64a of the lid receiving frame 64 is also inserted to install the lid receiving frame 64. Then, a nut 65 is screwed onto the fixing bolt 62 from the upper side of the flange portion 64a, and the nut 65 is tightened or loosened so that the coil spring 63 is elastically deformed and the lid receiving frame 64 is adjusted up and down. Meet face to face. After that, the outer form 66 and the inner form 67 are arranged along the outer peripheral surface and the inner peripheral surface of the upper concrete block 61 and the lid receiving frame 64, and the height adjusting gap between the upper concrete block 61 and the lid receiving frame 64. The lid receiving frame 64 is positioned and fixed by filling mortar or the like and hardening it.

[0005]

SUMMARY OF THE INVENTION In the above-described conventional method for adjusting the height of the lid receiving frame of the manhole, in the height adjusting gap between the upper portion of the manhole and the lid receiving frame, after the height adjustment, the lid receiving frame is laterally displaced, or Considering the strength of passing vehicles,
The position of the lid receiving frame is fixed by filling concrete or mortar and hardening it.

By the way, even after the height of the lid receiving frame of the manhole is once adjusted with respect to the road surface and the construction is completed, the height of the road surface itself may be lowered due to the depression of the road surface or the re-paving of the road surface. It has changed and it is necessary to readjust the height of the lid receiving frame again. At this time, when the height adjustment gap between the upper part of the manhole and the lid receiving frame is filled with concrete or mortar and hardened to fix the position of the lid receiving frame,
Adjustment bolts, adjustment nuts, or adjustment jigs such as springs cannot be reused because they are buried together with concrete or mortar. Therefore, a new adjustment jig must be prepared, which causes a problem that the construction cost becomes expensive.

Further, even if fine adjustment of the height adjustment of the lid receiving frame is performed after the height adjustment work, the height adjustment jig, especially the spring, is buried together with concrete or mortar. Therefore, it is not possible to vertically adjust the lid receiving frame by elastically supporting the spring. Therefore, despite the fine adjustment,
The hardened concrete or mortar must be destroyed, resulting in the problem that the work is time consuming and labor intensive.

The present invention has been proposed in order to solve the above-mentioned problems, and shortens the working time and labor even when the lid height is adjusted again after the construction is completed. The purpose is to make it possible to reuse the height adjustment jig.

[0009]

In order to achieve the above-mentioned object, a manhole cover height adjusting device according to the present invention has a height relative to a concrete block above a manhole when constructing a manhole under a road. In the manhole cover height adjusting device, in which the lid receiving frame is moved up and down by using the adjusting device to adjust the height of the lid part, the adjusting device is an adjusting bolt that stands on the upper surface of the concrete block. An elastic body that is interposed between the concrete block and the lid receiving frame and has a coil spring embedded in a sponge material; and a nut screwed to the adjusting bolt from the upper side of the lid receiving frame. It is what

Further, the elastic body is characterized in that a tapered coil spring is arranged in a hollow region of a hollow cylindrical sponge material.

Further, the elastic body is characterized in that a sheet material having a water-blocking property is integrally formed on the outer surface of a sponge material containing a coil spring.

Further, as a manhole cover height adjusting method according to the present invention, when a manhole is constructed under a road, a cover receiving frame is moved up and down with respect to a concrete block above the manhole by using a height adjusting device. In the manhole cover height adjustment method that adjusts the height of the lid part,
Adjusting bolts were erected at a plurality of points on the top surface of the concrete block, and an elastic body in which a coil spring was embedded in a sponge material was installed so that the coil spring could be inserted into the adjusting bolt, and provided on a flange portion of the lid receiving frame. Insert the adjustment bolt into the connection hole, screw a nut onto the adjustment bolt from the upper side of the lid receiving frame, adjust the screwing amount of the nut to adjust the height of the lid receiving frame while expanding and contracting the elastic body. Then
It is characterized in that the height adjusting gap formed between the concrete block upper surface and the lid receiving frame is filled with mortar and hardened.

Further, the elastic body has a tapered coil spring arranged in the hollow region of a hollow cylindrical sponge material,
When the elastic body is installed so that the coil spring is inserted into the adjustment bolt, the elastic body is installed so that the enlarged diameter portion of the taper is located above.

[0014]

The manhole cover height adjusting device according to the present invention is
As the elastic body, a coil spring inside a sponge material is used. Since this sponge material has an elastic force, it expands and contracts together with the coil spring, and prevents concrete, mortar, or the like from adhering to the coil spring embedded in the sponge material. Further, by adjusting the material or density of the sponge material, it is possible to adjust the absorption rate of concrete or mortar.

In the manhole cover height adjusting method according to the present invention, as described above, the adjusting bolt is erected on the upper surface of the concrete block constituting the upper part of the manhole, and the elastic body in which the coil spring is embedded in the sponge material is used as the coil spring. Is installed so as to pass through the adjustment bolt, and the height of the lid receiving frame is adjusted while adjusting the screwing amount of the nut to expand and contract the elastic body, and then the height adjustment gap is filled with mortar and cured. ing. At this time, the mortar slightly impregnates the sponge material, but the mortar does not adhere to the coil spring and the adjusting bolt. Further, by integrally forming a sheet material having water-blocking properties on the outer surface of the sponge material, it is possible to reliably prevent the sponge material from being impregnated with mortar.

When the height is adjusted again after the above height adjustment, the coil spring and the adjusting bolt are protected from the mortar by the sponge material, so that the elastic effect of the coil spring is not lost. Therefore, even if the nut is loosened again after the mortar is hardened, the lid receiving frame is elastically supported by the coil spring, so that the height can be adjusted upward, and after the height is adjusted again, the newly created height adjustment gap can be adjusted. The mortar can be filled and hardened to complete the construction. Also, when adjusting the height of the lid receiving frame downward, it is not necessary to destroy all of the hardened mortar, and the height adjustment is performed by scraping off the mortar which is the upper part, that is, the moving amount of the lid receiving frame only. Then, after the height adjustment is performed again, the mortar can be filled and cured in the newly formed height adjustment gap to complete the construction.

Since the mortar does not adhere to the coil spring, after the mortar is filled and cured in the height adjusting gap,
It is also possible to remove the lid receiving frame and remove only the coil spring. In this case, if the expanded diameter portion of the tapered coil spring is installed so as to be located above, the coil spring can be easily removed. As a result, the coil spring can be used for adjusting the lid height of other manholes, and the construction cost can be reduced.

[0018]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a partial side sectional view of a manhole cover height adjusting method showing a first embodiment of the present invention.
Is a sewer assembly manhole built under the road, which is commonly called a prehole, and a lower part of the manhole 1 has a sewer pipe (not shown) penetrating and connected thereto. When constructing the manhole 1, the height from the road surface is first confirmed and then installed.

The manhole 1 is constructed by stacking various concrete rings 2 on a foundation piled with foundation piles and ground stones in order, arranging an epoxy resin impregnated body or the like at each joint and adhering them. It is stopped and installed. An upper concrete block 3 is arranged on the uppermost stage of the concrete ring 2.

Reference numeral 4 denotes a metal lid receiving frame, which has a circumferential flange 4a formed therein, and the circumferential flange 4a is provided with a plurality of insertion holes 4b. The outer diameter of the lid receiving frame 4 is formed to be substantially the same as the outer diameter of the upper concrete block 3, and an iron manhole lid 5 is installed on the lid receiving frame 4.

Reference numeral 6 denotes an inner mold frame that is installed between the inner peripheral surface of the lid receiving frame 4 and the inner peripheral surface of the concrete block 3, and the inner mold frame 6 is made of a flexible material such as rubber. It is formed of a material having.

Reference numeral 7 is an outer mold frame that is installed between the outer peripheral surface of the lid receiving frame 4 and the outer peripheral surface of the upper concrete block 3, and the outer mold frame 7 can be the same as the inner mold frame 6. It is made of a flexible material.

As the manhole cover height adjusting device of the present invention, the adjusting bolt 10 which is erected on the upper surface of the concrete block 3 and the adjusting bolt 10 which is screwed from the upper side of the lid receiving frame 4 to the adjusting bolt 10. It is composed of a nut 11 and an elastic body 12 interposed between the concrete block 3 and the lid receiving frame 4.

The elastic body 12 is a perspective view of FIG.
As shown in the top view of FIG. 2B, the sponge material 12a is internally provided with a tapered coil spring 12b. The sponge material 12a is formed in a hollow cylindrical shape having a required height, and the coil spring 12 having the same height as the sponge material 12a is provided in the hollow area of the sponge material 12a.
b is arranged. Then, the elastic body 12, that is, the sponge material 12a and the coil spring 12b are interlocked with each other to expand and contract. Also, the sponge material 1
On the outer surface of 2a, a sheet material 12c such as a film having a water blocking property is integrally formed.

Another example of the elastic body 12 is shown in FIG.
As shown in the cross-sectional view of FIG. 1, the sponge material 12 has an outer shape formed into a conical taper shape and has a bolt insertion hole formed in the central axis.
A tapered coil spring 12b is provided inside a. That is, the coil spring 12b is embedded in the sponge material 12a in a spiral shape, and the sponge material 12a and the coil spring 12b both expand and contract in the same manner as described above. .

Next, a manhole cover height adjusting method using the above-described cover height adjusting device will be described. First, the adjustment bolts 10 are erected at a plurality of points on the upper surface of the upper concrete block 3. Next, the elastic body 12 is inserted into the adjusting bolt 10. At this time, the coil spring 12b is adjusted so that the expanded diameter portion of the coil spring 12b is located above.
0 is inserted. Then, the inner formwork 6 is arranged, the washer is passed through the adjustment bolt 10, and then the insertion hole 4b formed in the flange portion 4a of the lid receiving frame 4 is inserted into the adjustment bolt 1.
The lid receiving frame 4 is set by inserting it through 0. Next, the adjusting nut 11 is screwed onto the adjusting bolt 10, the screwing amount of the nut 11 is adjusted, and the elastic body 12 (sponge material 12a and coil spring 12b) is contracted, so that the manhole cover 5 matches the road surface. Adjust the lid height so that

After adjusting the height of the lid, the outer frame 7 is arranged,
The height adjusting gap generated between the concrete block 3 and the lid receiving frame 4 is filled with mortar. At this time, although the mortar slightly impregnates the sponge material 12a of the elastic body 12, due to the relationship between the viscosity of the mortar and the density of the sponge material,
Does not impregnate the inside (hollow region). Therefore, the mortar does not adhere to the coil spring 12b and the adjusting bolt 10 which are installed in the sponge material 12a. If a sheet material 12c is integrally formed on the outer surface of the sponge material 12a, the sheet material 12c prevents the sponge material 12a from impregnating the mortar, so that the coil spring 12b and the adjusting bolt 10 have mortar. It can be surely prevented from adhering. Then, after the mortar is hardened, the periphery of the manhole cover 5 is backfilled to complete the construction.

Next, by re-paving the road surface,
A case where the height of the manhole cover is adjusted again will be described. As described above, since the mortar does not adhere to the coil spring 12b, the coil spring 12b
Has not lost its elastic effect. Therefore, as shown in FIG. 4, when the adjustment nut 11 is unscrewed and the lid receiving frame 4 is removed, the mortar is hardened in the initial height adjustment gap, but the coil spring 12b has the original height. Restore to.

When the height of the manhole cover 5 is adjusted upward in the above-mentioned state, as shown in FIG. 5, the inner formwork 6 is mounted and a coil spring is newly added with a hollow cylindrical sponge material 12a '. 12b is installed and the lid receiving frame 4 is set. Then, by adjusting the screwing amount of the adjusting nut 11, the sponge material 12
The height of the lid receiving frame 4 is adjusted so that the manhole lid 5 is aligned with the road surface while expanding and contracting a'and the coil spring 12b. Then, after mounting the outer mold 7, the mortar is filled in the height adjusting gap newly formed between the upper surface of the cured mortar and the lid receiving frame 4 and cured. After the mortar is hardened, the manhole cover 5 is backfilled to complete the construction.

When the height of the manhole cover 5 is adjusted downward after hardening the mortar, as shown in FIG. 6, the adjustment amount, that is, the lid receiving frame 4 is set without destroying all the hardened mortar. Scrap off the hardened mortar required for the height adjustment movement downward. Then, in the same manner as described above, after the height is adjusted again, the mortar is filled and hardened in the height adjusting gap newly formed between the upper surface of the mortar and the lid receiving frame 4, and the periphery of the manhole lid 5 is backfilled. Complete the construction.

Further, in the lid height adjusting method of the first stage,
Since the mortar does not adhere to the coil spring 12b after the mortar is hardened, the coil spring 12b can be removed by removing the lid receiving frame 4. At this time, as shown in FIGS. 1 and 4, the coil spring 12b has a taper expanded portion located above, so that there is an advantage that the coil spring 12b can be easily removed when the coil spring 12b is pulled out upward and removed. When the lid height is adjusted again, the coil spring 12b is again attached to the sponge material 12
The height of the lid is adjusted by arranging it so that it is placed inside a. By removing the coil spring 12b in this manner, the coil spring 12b can be used for adjusting the lid height of other manholes, and the construction cost can be reduced.

As described above, when the lid height is adjusted again after the first-stage lid height adjustment, the height adjusting device used for the first-stage lid height adjustment, particularly the coil spring 12b and the adjusting bolt 10, can be reused. . Therefore, it is not necessary to completely destroy the hardened mortar as a preparatory step, and the work labor can be reduced. Further, when the lid height is adjusted again, a new height adjusting device is not required, so that the construction cost can be reduced.

[0033]

As described above, according to the present invention, since the sponge material containing the coil spring is used as the elastic body,
Since the mortar etc. filled in the height adjustment gap does not adhere to the coil spring, the coil spring can be reused, and even when the lid height is adjusted again, the hardened mortar is not destroyed. The lid height can be adjusted again. As a result, it is possible to reduce the work labor and the work time, and further, since the height adjusting device can be reused, it is possible to reduce the work cost.

[Brief description of the drawings]

FIG. 1 is a partial side sectional view of a manhole cover height adjusting method of the present invention.

FIG. 2 is an explanatory diagram of an elastic body.

FIG. 3 is an explanatory view of a state in which a lid receiving frame is removed after the lid height is adjusted.

FIG. 4 is an explanatory view of a state in which the lid receiving frame is removed after the lid height is adjusted.

FIG. 5 is an explanatory diagram of a lid height adjusting method.

FIG. 6 is an explanatory diagram of a lid height adjusting method.

FIG. 7 is an explanatory diagram showing a conventional example.

FIG. 8 is an explanatory diagram showing a conventional example.

[Explanation of symbols]

 1 Manhole 2 Concrete ring 3 Upper concrete block 4 Lid receiving frame 4a Flange 4b Insertion hole 5 Manhole lid 6 Inner formwork 7 Outer formwork 10 Adjustment bolt 11 Adjustment nut 12 Elastic body 12a Sponge material 12b Coil spring 12c Sheet material G Height adjustment gap

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiromasa Shimura 1-10-6 Takaban, Meguro-ku, Tokyo Hakko Co., Ltd. (72) Inventor Isamu Yuki 3-18-3 Daikan, Kanagawa Prefecture Hakko Co., Ltd. (72) Inventor Masatoshi Utano 751 Shin-Maruko-cho, Nakahara-ku, Kawasaki-shi, Kanagawa

Claims (5)

[Claims] 1. A manhole for adjusting a height of a lid part when a manhole is constructed under a road, by moving a lid receiving frame up and down by using a height adjusting device with respect to a concrete block above the manhole. In the lid height adjusting device, the adjusting device is interposed between the adjusting bolt standing on the upper surface of the concrete block, and the concrete block and the lid receiving frame,
A manhole cover height adjusting device comprising: an elastic body having a coil spring embedded in a sponge material; and a nut screwed to the adjusting bolt from above the lid receiving frame. 2. The manhole cover height adjusting device according to claim 1, wherein the elastic body is formed by arranging a tapered coil spring in a hollow region of a hollow cylindrical sponge material. 3. The manhole cover height according to claim 1, wherein the elastic body is formed by integrally forming a sheet material having water impermeability on an outer surface of a sponge material containing a coil spring. Adjustment device. 4. A manhole for adjusting a height of a lid part when a manhole is built under a road, by moving a lid receiving frame up and down with respect to a concrete block above the manhole by using a height adjusting device. In the lid height adjusting method, the adjusting bolts are erected at a plurality of positions on the concrete block upper surface, and an elastic body having a coil spring embedded in a sponge material is installed so that the coil spring is inserted into the adjusting bolt. The adjustment bolt is inserted into the connection hole provided in the flange portion of the receiving frame, the nut is screwed onto the adjustment bolt from the upper side of the lid receiving frame, and the elastic amount is expanded and contracted by adjusting the screwing amount of the nut. While adjusting the height of the lid receiving frame, a mortar is filled in the height adjusting gap formed between the upper surface of the concrete block and the lid receiving frame to cure the mortar. Lid height adjustment method of Lumpur. 5. The elastic body according to claim 4, wherein a tapered coil spring is arranged in a hollow region of a hollow cylindrical sponge material, and the elastic body is installed so that the coil spring is inserted into the adjusting bolt. 5. The manhole cover height adjusting method according to claim 4, wherein the taper expanded portion is installed so as to be located at the upper side.