JP2782283B2 - Manhole cover height adjustment method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention raises a palate of a manhole installed on a route such as a gas pipeline laid under a road or the like to a height corresponding to a road surface level. To adjust the height of the manhole cover.

[Conventional technology]

Conventionally, this type of manhole cover height adjustment method is based on an inner cover block joined to the upper part of the manhole body, and further, on the base, corresponding to the raised height to be adjusted. From the prepared adjustment blocks of various heights,
Selecting one or a plurality of adjustment blocks of the required height, inserting them into embedded bolts inserted into the upper surface of the inner lid block, and stacking them at the required height; On top of that, one or more iron piece liners of the required thickness are selected for fine adjustment, and this is interposed between the upper adjustment block and the lid receiving frame to be placed thereon, so that the manhole cover Positioning the receiving frame in a relationship whose upper surface corresponds to the road surface height to be adjusted; After the alignment, remove the lid receiving frame again, spread the required amount of mortar (cement resin) in the plane of the fine adjustment gap with the iron piece liner interposed, put the lid receiving frame again, and place the flange on the lid receiving frame. The bolt holes provided in the above are fitted to the heads of the embedded bolts and tightened and fixed with nuts.

[Problems to be solved by the invention]

Such a conventional adjustment method has the following problems.

First, although the adjustment block stacked on the inner lid block for raising is penetrated by the embedded bolt erected on the inner lid block serving as the base, its fitting is only loosely penetrated Therefore, the adjustment block is used for vehicle load passing over the manhole palate, earthquake,
Horizontal and vertical loads, which are affected by changes in the temperature of the road surface, are likely to cause misalignment between the blocks, resulting in rattling and a change in the position of the adjustment block, which may alter the stacking condition. A phenomenon that causes a step with the road surface is derived.

Also, the iron piece liner interposed for fine adjustment is fixed by tightening the nut screwed to the embedded bolt, but the nut vibrates due to the vehicle load passing over the manhole cover described above. When loosened due to the impact, the iron piece liner also shifts in position and falls, causing a phenomenon that a step is formed between the liner and the road surface.

Further, there is a problem that the tightening portion by the nut is easily loosened due to the above-mentioned vibration, whereby the lid receiving frame rattles early and generates a rattling sound when the vehicle passes.

In addition, since the iron piece liner is interposed for fine adjustment, the work of interposing the iron piece liner is troublesome, the workability is poor, and there is a problem that time is required for the raising work and the cost is increased.

An object of the present invention is to provide a method for adjusting the bulkiness of a manhole, which solves the above-mentioned problems.

[Means for solving the problem]

To achieve this object, the adjustment method according to the present invention is:
An inner lid block is joined to the upper part of the manhole body buried under the road, and when adjusting the height of the lid receiving frame of the manhole palate fixed upward based on the inner lid block to a height corresponding to the road surface level, On the upper surface of the inner lid block, corresponding to the raised height to be adjusted, one or more adjusting blocks having a predetermined height dimension are stacked by penetrating the embedding bolts inserted on the upper surface of the inner lid block, and The top of the lid receiving frame is adjusted to the height corresponding to the road surface level by adjusting the distance of the lid receiving frame by tightening nuts from above, leaving a required fine adjustment space with a coil spring inserted through the embedded bolt. Then, after the alignment, the inner frame and the outer frame are fitted inside and outside the manhole between the inner lid block and the lid receiving frame, so that the fine adjustment space and the raising of the height by the adjustment block are performed. The inside and outside of the part are sealed, and in this sealed state, resin mortar having fluidity between the outer frame and the lid receiving frame is injected and filled up to the height position covering the nut tightening part of the embedded bolt and cured. It is characterized by being constructed so that

[Action]

In such an adjustment method, when the resin mortar is injected and filled from between the outer frame and the lid receiving frame, the inner and outer portions of the adjusting blocks, fine adjustment spaces, etc., which are stacked on the inner lid block, are raised. Since the resin mortar is sealed by the inner frame and the outer frame fitted to the manhole opening, the resin mortar is inserted into the fine adjustment space, through the insertion hole of the embedding bolt inserted into the adjustment block, and through the insertion hole. As a result, the adjusting blocks are sufficiently permeated and filled in the joint surfaces.

As a result, the raising block of the adjustment block, the fine adjustment space, etc., is hardened as an integral resin cured product, so that the horizontal direction acting due to the vehicle load passing on the manhole cover, an earthquake, a temperature change of the road surface, etc. , Sufficient strength to prevent misalignment against vertical load is obtained, and no misalignment occurs between the adjustment blocks or in the fine adjustment space. The inconvenience is resolved.

In addition, the resin mortar is filled to a level that covers the nut tightening part of the mounting bolt, so the resin mortar prevents the nut from loosening due to the integral curing of the resin mortar and prevents the lid receiving frame from rattling An effect that can be obtained is also obtained.

In addition, the adjusting method is a method of finely adjusting the raised height of the lid receiving frame, the lid receiving frame supported by the coil spring,
Since the means for adjusting the gap by tightening the nut from above is used for the alignment, workability is improved as compared with the conventional alignment using an iron piece liner, and the raising work can be performed in a short time.

〔Example〕

Hereinafter, an embodiment of a bulkiness adjusting method according to the present invention will be described with reference to the drawings.

FIG. 1 is a cross-sectional view of a part of a manhole opening to which an adjustment method according to the present invention is applied. In the figure, reference numeral 1 denotes a concrete manhole body buried and installed under a road or the like, and 2 denotes a manhole body. An inner lid block 3 joined to the upper portion of the manhole body 1 indicates an inner lid supported by the inner lid block 2. The inner lid block 2 is superposed on the manhole body 1 in a state where the joining surfaces thereof are bonded to each other by an impregnation method or the like.

(Step of Positioning Raising Height) The adjusting method according to the present invention is based on the upper surface of the inner lid block 2 when the raising method of the manhole palate 4 is performed. And the height level GL of the road surface to be adjusted is the dimension H of the raised height.

An embedding bolt 5 is erected by an insert on the upper surface of the inner lid block 2 at four equally-spaced portions in the circumferential direction. Then, a plurality of adjustment blocks 6, 6a having a predetermined height are stacked.

The adjustment blocks 6, 6a select an arbitrary one of various prepared height adjustment blocks corresponding to the above-mentioned raised height dimension H, and select and combine the adjustment blocks 6, 6a. Are superimposed so that the stacking height of each of them becomes a desired height dimension h. The number may be singular or three or more.

The above-mentioned embedded bolt 5 has a length protruding above the height level h in which the adjusting blocks 6, 6a are stacked, and reaches the upper portion in this embodiment to the projected portion of the embedded bolt 5. A conical coil spring 7 having a small coil diameter and a sufficient amount of deflection is inserted in accordance with the above-mentioned formula, and the circumferential flange 8a of the lid receiving frame 8 is fixed to the nut with the necessary fine adjustment space a opened by the conical coil spring 7. By adjusting the gap by tightening 5a, the upper surface of the lid receiving frame 8 (the upper surface of the manhole cover 4 fitted and supported by the lid receiving frame) is positioned so as to correspond to the road surface level GL to be adjusted.

(Sealing Step of Raising Adjustment Section) After this alignment, annular inner frames 10 and outer frames 11 having required heights are fitted inside and outside the manhole opening between the inner lid block 2 and the lid receiving frame 8, respectively. Thus, the inside and the outside of the raising adjustment section by the adjustment blocks 6, 6a and the fine adjustment space a are sealed.

Here, the inner frame 10 and the outer frame 11 are not particularly shown, but are desirably configured so as to be capable of expanding and reducing the diameter in the radial direction. After being inserted, the diameter is increased outward and adheres to the inner surface, and the outer frame 11 is attached to the outer periphery of the manhole opening in a state where the diameter is increased, so that the diameter is reduced inward and adheres to the outer surface,
The above-mentioned sealing effect is enhanced.

(Filling step of resin mortar) In a state where the above-mentioned raised portion is sealed by the inner frame 10 and the outer frame 11, an epoxy resin and sand are mixed between the outer frame 11 and the lid receiving frame 8. The resulting resin mortar 12 having fluidity is injected.

The resin mortar 12 is filled up to a position covering the nut 5a of the embedding bolt 5, and the filling pressure causes the resin mortar 12 to be filled in the closed fine adjustment space a, and a part of the filled mortar. Penetrates from the space a into the gap between the embedding bolt 5 penetrated through the adjustment blocks 6, 6a and the insertion hole,
Further, the space between the joining surfaces of the adjustment blocks 6, 6a is also filled with the penetration through the insertion holes.

(Removal process of inner frame 10 and outer frame 11) After filling the above-mentioned resin mortar 12, after the filled resin mortar 12 is cured after a predetermined time, the above-mentioned inner frame 10 and outer frame 11 are removed. Then, the periphery of the lid receiving frame 8 is backfilled to complete the lid height adjusting method.

〔The invention's effect〕

According to the manhole cover height adjusting method according to the present invention,
As described above, after adjusting the raised position of the lid receiving frame 8, the adjustment block stacked on the inner lid block 2.
6, 6a, the fine-adjustment space a and the like are adjusted by the inner frame 10 and the outer frame 11 fitted inside and outside the manhole opening, and the resin mortar 12 is sealed in this sealed state. Since the resin mortar 12 is injected and filled from between the outer frame 11 and the lid receiving frame 8, the resin mortar 12 is inserted into the fine adjustment space a, through the insertion hole of the embedding bolt 5 inserted through the adjustment blocks 6, 6a, and through the insertion hole. As a result, the adjusting blocks 6, 6a can be sufficiently filled with permeation between the joint surfaces.

As a result, the raised portions of the adjustment blocks 6, 6a, the fine adjustment space a, and the like are cured as an integral resin cured product, so that the vehicle load passing through the manhole cover 4 can be reduced.
Sufficient displacement prevention strength is obtained for horizontal and vertical loads acting due to earthquakes, road surface temperature changes, etc.
Since no displacement occurs between the adjustment blocks or the inclusions in the fine adjustment space, it is possible to eliminate various inconveniences caused by the conventional displacement.

In addition, since the resin mortar 12 is filled to a level where the filling level covers the nut tightening portion of the embedding bolt 5, the resin mortar 12 is integrally hardened to prevent the nut 5a from being loosened, and the lid receiving frame is loose. Can also be prevented.

Further, according to the present invention, as means for finely adjusting the raised height of the lid receiving frame 8, the lid receiving frame 8 supported by the coil spring 7 is used.
Is a means for adjusting the distance by tightening the nut 5a from above, so that the workability is improved as compared with the conventional alignment with the interposition of the iron piece liner, and the effect that the lifting work can be carried out in a short time is also achieved. can get.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a part of a manhole opening to which a manhole bulkiness adjusting method according to the present invention is applied, and FIG. 2 is a cross-sectional view showing a part of the manhole opening cut away. 1 ... manhole body, 2 ... inner lid block, 3 ... inner lid, 4 ... manhole palate, 5 ... embedded bolt, 5a ...
Nut, 6, 6a ... Adjustment block, 7 ... Coil spring, 8
... lid receiving frame, 8a ... circumferential flange of lid receiving frame, 10 ... inner frame, 11 ... outer frame, a ... fine adjustment space.

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Kenji Oshima 3-18-18 Daikan, Yamato-shi, Kanagawa Prefecture Inside HAKKO Development Technology Research Institute Co., Ltd. (56) References Jikaichi Sho 61-146548 (JP, U) 54-20839 (JP, Y2) (58) Fields investigated (Int. Cl. ⁶ , DB name) E02D 29/12

Claims (1)

(57) [Claims] 1. An inner lid block is joined to an upper part of a manhole body buried under a road, and a lid receiving frame of a manhole palate fixed upward on the basis of the inner lid block to a height corresponding to a road surface level. At the time of raising the height, one or more adjusting blocks having a predetermined height are passed through the embedding bolts inserted into the upper surface of the inner lid block, on the upper surface of the inner lid block, according to the raised height to be adjusted. The upper surface of the lid receiving frame was adjusted to the road surface level by adjusting the distance between the lid receiving frame and the upper part of the lid receiving frame by tightening nuts from above, leaving a required fine adjustment space with a coil spring inserted through the embedded bolt. After the alignment, the inner frame and the outer frame are fitted inside and outside the manhole between the inner lid block and the lid receiving frame to fit the fine adjustment space and the adjustment block. The inside and outside of the raised portion are sealed, and in this sealed state, the resin mortar having fluidity between the outer frame and the lid receiving frame is injected and filled to the height position covering the nut tightening portion of the embedded bolt. The method of adjusting the height of the manhole cover, characterized in that it is constructed so that it hardens when it is set.