JP2852577B2 - Square manhole cover height adjustment method - 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 for adjusting the height of a square-shaped manhole cover for adjusting the height of a square-shaped cover when building a manhole under a road.

[0002]

2. Description of the Related Art Conventionally, when building a manhole under a road,
The manhole cover needs to be adjusted up and down with respect to the road surface. For this purpose, various manhole cover height adjustment methods or height adjustment devices have been proposed. Generally, the manhole cover is often circular, but there are also quite a number of cases where the cover is made rectangular due to the contents accommodated in the manhole. To adjust the height of the manhole cover, adjust the cover frame up and down with respect to the upper concrete block of the manhole, and arrange the outer and inner forms along the outer and inner peripheral surfaces of the upper concrete block and the cover frame. Then, the height adjusting gap between the upper concrete block and the lid frame between the outer and inner frames is filled with mortar or the like and solidified.

[0003]

When the cover of the manhole is circular, the means for fixing the outer mold and the inner mold have a circular shape with respect to the circular outer mold and the inner mold. The outer formwork is tightened from the outside by the tightening band and the tension band, and the inner formwork is tightened from the inside to stably fix it.The upper concrete block and lid frame between the outer formwork and the inner formwork By filling mortar or the like into the height adjustment gap and solidifying it, the operation can be performed relatively easily.
However, if the manhole cover has a square shape, especially a rectangular shape, it is easy to fasten and fix the rectangular outer mold frame from the outside with a tightening band. Tensioning with tension bands is not easy.

That is, when the rectangular inner mold is tensioned from the inside, the pressing force at the four corners tends to be insufficient. For this reason, when the inner form is tensioned diagonally,
The worker cannot enter the manhole (entrance). The long side of the inner mold is pushed by the mortar filled between the outer mold and the inner mold, and the mortar is easily spilled into the manhole. After the mortar is solidified, the outer mold and the inner mold are difficult to remove, and the member that tensions the inner mold from the inside cannot be reused because it is used only once, which is uneconomical. A lot of time is required for attaching and detaching the outer mold frame, the inner mold frame, and a member for tensioning the inner mold frame from the inside. And so on. The present invention has been made to solve the above-mentioned various problems.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides a manhole cover having a square-shaped cover for adjusting the height of a manhole under a road. In the construction method, the lid frame is adjusted vertically with respect to the upper concrete block of the manhole, and an outer frame and an inner frame made of a foamed polyurethane sheet etc. are arranged along the outer peripheral surface and the inner peripheral surface of the upper concrete block and the lid frame. The height adjustment gap between the upper concrete block and the lid frame is filled with mortar or the like to be solidified, the outer frame is tightened with a tightening band, and the inner frame is provided with a holding band and a tightening jig. The fastening jig has a rectangular metal band frame with a cushion material attached to the outside, and the corner and the straight portion of the band frame are provided at four corners of the metal band frame, respectively. A tension mechanism is provided to tension the band frame, the band frame is tensioned by the tension mechanism, a mortar or the like is filled between the outer frame and the inner frame, and after the mortar is solidified, the tension mechanism is loosened to release the band frame. The straight jig is bent or curved inward, and the fastening jig is removed.

[0006]

According to the above means, the method for adjusting the height of the rectangular manhole cover according to the present invention performs the following operations. Since the outer frame and the inner frame are made of a foamed polyurethane sheet or the like, they can be easily processed into a mold frame, have good releasability from solidified mortar and the like, require a short working time, and have a clean finish. A holding band and a fastening jig are provided on the inner frame, and a cushioning material is attached to the outside of the rectangular metal band frame. Does not damage the inner frame made of sheets or the like. A tension mechanism is provided at the four corners of the square metal band frame of the fastening jig to tension the corners and the straight portions of the band frame, so that not only the four corners of the band frame but also the straight portions are tensioned to a desired tension state. The mortar and the like filled between the outer frame and the inner frame do not spill into the manhole from the long side of the inner frame. In addition, since the manhole can be freely inserted, the working efficiency is improved. After the mortar filled between the outer frame and the inner frame solidified, the tensioning mechanism was loosened and the straight part of the band frame was bent or bent inward to remove the fastening jig. The attachment / detachment operation to the inner frame can be performed in a short time, and the fastening jig can be used any number of times.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be specifically described below with reference to the accompanying drawings. 3 and FIG.
Has a rectangular shape built under the road 2
A manhole having a predetermined depth is provided with a valve 3 at the bottom of the manhole 1. Gas pipes 4 laid under the road 2 are connected to the left and right sides of the valve 3 through the manhole wall. The inner lid frame 11, the inner lid 13, the upper lid frame 15, and the upper lid 16, which will be described later, each have a rectangular planar shape.

In the manhole 1, a lower block 5 is placed on a foundation fixed with a foundation pile, a grit stone, etc.
The divided pipe surrounding block 6, upper pipe block 7, straight wall block 8, pedestal block 9, adjustment block 10, inner lid frame 11, inner lid block 12, and the like are sequentially stacked, and an epoxy resin impregnated body is joined to each joint. It is arranged and glued, and at the same time waterproofed to form a confidential manhole. Then, the inner lid 13 is fitted to the inner lid frame 11 and the inner lid block 12, and a plurality of upper lid frame fixing bolts 14 provided on the inner lid block 12,
The upper cover frame 15 is fixed by 14. The upper cover 16 is fitted to the upper cover frame 15. When the upper lid frame 15 is fixed to the inner lid block 12 via a plurality of upper lid frame fixing bolts 14, 14,... In the present invention, as shown in FIG. An adjustment table 18 and the like are provided.

In the above-described manhole 1, when the road 2 is rehabilitated and the height of the manhole cover is adjusted according to the pavement height of the road, first, a road pavement material (asphalt or Concrete) is removed, and then the soil up to the inner lid block 12 around the outer periphery of the manhole 1 is excavated and removed. The upper cover frame fixing bolt 14 is provided with a casting nut 19 provided on the inner cover block 12.
The lower end portion is screwed into and is erected through the adjusting table 17 and the resin adjusting table 18.
5a, the upper surface of the resin adjustment table 18 and the upper lid frame 15
An adjustment spring 20 and a washer 21 each having a truncated conical side surface are interposed between the lower surface and a nut 14a. The vertical height of the upper lid frame 15 is adjusted via the adjustment spring 20 by the rotation of the nut 14a.

An outer frame 22 and an inner frame 22 made of a foamed polyurethane sheet are formed along the outer peripheral surface and the inner peripheral surface from the inner lid block 12, which is the upper concrete block of the manhole 1, to the adjusting table 17, the resin adjusting table 18, and the upper lid frame 15. A frame 23 is provided, and a resin mortar 24 is filled in a height adjustment gap between the resin adjustment table 18 and the upper lid frame 15 to be solidified. At this time, the outer frame 22 is tightened by a tightening band 27 via a backing plate 25 and a urethane foam rubber 26 serving as a cushioning material.
The upper part is pressed by a holding band 29 via urethane foam rubber 28, and the lower part is fastened by a fastening jig 31 via urethane foam 30.

As shown in FIG. 1, the fastening jig 31 has a rectangular metal band frame 32 on the outside of which a urethane foam rubber 30 is attached. The metal band frame 32 is provided with spring steel plates 32a, 32a on the short sides and stainless steel plates 32b, 32b from the long sides to the short sides.
Hinges 33, 33 that can rotate inward are provided. At four corners of the metal band frame 32, turnbuckles 34, which are tension mechanisms for tensioning the corners and the straight portions of the band frame 32, respectively, are pivoted parts 35, 35.
Has been pivoted through.

The band frame 32 is tensioned by the turnbuckles 34, 34,.
The height adjustment gap between the upper surface of the resin adjustment table 18 and the lower surface of the upper lid frame 15 is filled with the resin mortar 24 from between the inner frame 23 and the resin mortar 24, and after the resin mortar 24 is solidified, the turnbuckles 34, 34. Is loosened, and the straight portions of the band frame 32 are connected to the hinges 33, 33 and the spring steel plates 32a,
The fastening jig 31 is removed from the portion 32a by bending or bending inward.

The height adjusting device (construction method) for the square-shaped manhole cover of one embodiment configured as described above repairs the road 2 and adjusts the height of the manhole cover according to the pavement height of the road. First, asphalt or concrete which is a road pavement material on the outer periphery of the upper cover frame 15 is removed, and then the soil around the manhole 1 is excavated up to the inner cover block 12 to expose the outer periphery. Then, the upper surface of the resin adjustment base 18 and the upper lid frame 15 are placed on the upper lid frame fixing bolts 14.
The adjustment spring 20 and the washer 21 are interposed between the lower surface of the upper cover frame 15, the mounting hole 15a of the upper lid frame 15 is inserted, and the nut 14a is screwed into the upper end. In this state, by rotating the nut 14a, the adjustment spring 20 expands and contracts, and the vertical height of the upper lid frame 15 is adjusted, so that it can be adjusted to the new pavement surface height of the road 2.

After the vertical height of the upper lid frame 15 has been adjusted (or before the height adjustment is performed), the outer peripheral surface and the inner peripheral surface from the inner lid block 12 to the adjusting table 17, the resin adjusting table 18, and the upper lid frame 15 are formed. The outer frame 22 and the inner frame 23 are disposed along the outer frame 22, and the outer frame 22 is tightened and fixed by the tightening band 27 via the backing plate 25 and the urethane foam rubber 26, and the inner frame 23 is in the upper position. Urethane foam 2
8, and is held down by a holding band 29, and the lower portion thereof is fastened and fixed by a fastening jig 31 via a urethane foam rubber 30.

The band jig 31 is tightened by extending each of the turnbuckles 34 provided at the four corners of the rectangular metal band frame 32.
The two corners and the straight portion are tensioned through the pivotal attachment portions 35, 35, and the inner frame 23 is connected to the inner lid block 12, the adjusting base 17, the resin adjusting base 18, and the upper lid frame 1 through the urethane foam rubber 30.
5 and fixed to the inner peripheral surface. Then, from between the outer frame 22 and the inner frame 23, the upper surface of the resin adjustment base 18 and the upper lid frame 1
Resin mortar 24 is filled in the height adjustment gap with the lower surface of 5, and resin mortar 24 solidifies in a relatively short time.

When the resin mortar 24 has solidified, the turnbuckles 34, 34.
Of the straight part of the hinge 33, 33 position and spring steel plate 32
The fastening jig 31 can be easily removed from the portions a and 32a by bending or bending inward. Further, the holding band 29 is removed, and the inner frame 23 is removed while being peeled off from the resin mortar 24. Similarly, the fastening band 27 is removed, and the outer frame 22 is removed while being peeled off from the resin mortar 24. Then, the exposed portion of the outer periphery of the manhole 1 up to about the inner lid block 12 is backfilled with soil, and the outer peripheral portion of the upper lid frame 15 is paved at the same time as the pavement of the road 2 to complete the entire repair work.

[0017]

As described above, according to the method of adjusting the lid height of the rectangular manhole according to the present invention, the following effects can be obtained. Since the outer frame and the inner frame are made of a foamed polyurethane sheet or the like, processing into the outer frame and the inner frame is easy, and the releasability from the solidified mortar or the like is good, and the finish can be neatly finished. In addition, it requires less work time and is inexpensive. A holding band and a fastening jig are provided on the inner frame, and a cushioning material is attached to the outer side of the square metal band frame, so that the inner frame is stably supported, and a foamed polyurethane sheet or the like is provided. The inner frame made of is not damaged. A tension mechanism is provided at the four corners of the square metal band frame of the fastening jig to tension the corners and the straight portions of the band frame, so that not only the four corners of the band frame but also the straight portions are tensioned to a desired tension state. As a result, the inner frame can be securely fixed, and the mortar or the like filled between the outer frame and the inner frame can be prevented from spilling from the long side of the inner frame into the manhole. In addition, the manhole can be freely inserted. After the mortar filled between the outer frame and the inner frame solidified, the tensioning mechanism was loosened and the straight part of the band frame was bent or bent inward to remove the fastening jig. The attachment / detachment operation to the inner frame can be performed in a short time, and the fastening jig can be used any number of times.

[Brief description of the drawings]

FIG. 1 is a plan view of a fastening jig according to the present invention.

FIG. 2 is a longitudinal sectional view of a main part of a manhole.

FIG. 3 is a longitudinal sectional view of the entire manhole.

FIG. 4 is a plan view of a manhole cover.

[Explanation of Signs] 1 Manhole 2 Road 3 Valve 4 Gas pipe 5 Down pipe block 6 Pipe block 7 Pipe upper block 8 Straight wall block 9 Pedestal block 10 Adjustment block 11 Middle lid frame 12 Middle lid block 13 Middle lid 14 Upper lid frame Fixing bolt 14a Nut 15 Upper lid frame 15a Mounting hole 16 Upper lid 17 Adjustment stand 18 Resin adjustment stand 19 Cast-in nut 20 Adjustment spring 21 Washer 22 Outer frame 23 Inner frame 24 Resin mortar 25 Patch plate 26, 28, 30 Urethane foam rubber 27 Tightening band 29 Holding band 31 Tightening jig 32 Metal band frame 32a Spring steel plate 32b
Stainless plate 33 Hinge 34 Turnbuckle 35 Pivot

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Norikatsu Ike 3-18-3 Deputy Director, Yamato City, Kanagawa Prefecture Inside Hakko Development Technology Laboratory Co., Ltd. (56) References JP-A-3-228924 (JP, A) JP-A-3-228925 (JP, A) JP-A-3-228927 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) E02D 29/12

Claims (1)

(57) [Claims] In a manhole cover height adjusting method for adjusting the height of a square-shaped cover part when constructing a manhole under a road, a cover frame is moved up and down with respect to an upper concrete block of the manhole. Adjust and arrange the outer frame and inner frame made of foamed polyurethane sheet etc. along the outer peripheral surface and inner peripheral surface of the upper concrete block and the lid frame, and mortar in the height adjustment gap between the upper concrete block and the lid frame. The outer frame is tightened with a tightening band, the inner frame is provided with a holding band and a tightening jig, and the tightening jig has a rectangular shape with a cushion material attached to the outside. A metal band frame is provided, and a tension mechanism is provided at each of the four corners of the metal band frame to tension the corners and the linear portion of the band frame. After the mortar is solidified, mortar is filled between the outer and inner frames, and after the mortar has solidified, the tensioning mechanism is loosened and the straight part of the band frame is bent or bent inward to tighten. The height adjustment method of the square manhole cover, characterized in that the tool is removed.