JP3071362U - Level adjustment mat - Google Patents

Abstract

(57) [Summary] [Problem] Asphalt cools down over time,
Even if used, asphalt will be scattered or peeled off, making it virtually unusable. For this reason, work efficiency is poor, such as the need to go asphalt for each location,
It is an object of the present invention to provide a level-adjusting mat which can solve the problem such that the remaining asphalt becomes an industrial waste with a limited treatment and can be constructed economically in a short time. A level adjustment mat includes a lower mat having a plurality of holes that are cut at least in the lid receiving frame and are placed at the bottom of a recess around the lid receiving frame, and a lid receiving frame on the lower mat. The upper surface of the upper layer mat is adjusted to be the same as the level of the upper surface of the road surface and the upper surface of the manhole cover. An intermediate layer mat is provided between the lower layer mat and the upper layer mat, and the mats of the respective layers can be divided and joint metal fittings are provided at joint portions.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a level adjuster used to raise and lower a manhole cover installed under a road to a road surface level.

[0002]

[Prior art]

 Generally, when the height of the existing manhole cover does not match the height of the new road due to road construction, the manhole cover installed under the road prior to the road construction (including replacement of the lid and repair of the neck) should be attached to the top surface. However, it is raised and lowered so that there is no step with the road surface.

[0003] Specifically, the periphery of the manhole cover is cut with a pavement cutter, excavated to a predetermined depth, and then the number of neck blocks at the upper end of the manhole on which the cover receiving frame is placed is increased and decreased. And fix it to the upper surface of the top neck block with the insert bolt for fixing the lid receiving frame that is upright. If the neck block is not used, increase or decrease the number of bricks and raise or lower the lid receiving frame with mortar.

After the height of the lid receiving frame and its inclination with respect to the road surface are matched, the recessed portion around the receiving frame is backfilled with crushed stone, earth and sand, and the upper portion is paved with asphalt to raise the height of the receiving frame. Complete the lowering work, open the road and move to the next site.

[0005]

[Problems to be solved by the invention]

 However, such a cover height adjustment work is a small-scale work, and it is usually necessary to carry out temporary paving at each site and move to the next site. However, the minimum shipping amount of asphalt for temporary paving is about 0.5 ton, which causes a problem that most of the asphalt is left behind.

In particular, asphalt cools down over time, and even when used, asphalt scatters or peels off, making it virtually unusable. As a result, work efficiency was low, such as the necessity of removing asphalt at each location, and the remaining asphalt became industrial waste with limited treatment.

An object of the present invention is to provide a level adjustment mat that can be constructed in a short time and economically in view of the above-mentioned problems.

[0008]

[Means for Solving the Problems]

 In view of the above-mentioned problem, the present invention provides a buried structure which is embedded in a recess around a lid receiving frame formed on a lid receiving frame and a road surface after adjusting a lid height of a manhole, by cutting out at least the lid receiving frame portion. It consists of a lower mat with a plurality of holes to be placed at the bottom of the recess around the lid receiving frame, and a hard upper mat that cuts and places the lid receiving frame on the lower mat. A level adjustment mat provided with an intermediate layer mat is formed between the upper layer mat and the upper layer mat. The mats divided into each layer have a weight that can be transported and constructed when buried in the recess.

The thickness of the mat in each layer is adjusted and formed in advance so that the upper surface of the upper mat is the same as the level of the road surface and the upper surface of the manhole cover. The height can be raised and lowered so that there is no step between the end surface and the road surface.

Other configurations will be described in detail in the following embodiments.

[0011]

[Embodiment of the invention]

 Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic sectional view illustrating the level adjusting mat of the present invention, FIG. 2 is an external view showing a structure around a lid receiving frame according to the present invention, and FIG. 3 is a level adjusting mat of the present invention. FIG. 4 is an external view showing a lower layer mat of the present invention, FIG. 4 is an external view showing an intermediate layer mat of the level adjusting mat of the present invention, and FIG. 5 is an upper layer mat of the level adjusting mat of the present invention. In the drawings, the portions denoted by the same reference numerals as those in the drawings represent the same components.

As shown in FIGS. 1 to 5, the level adjuster of the present invention is embedded in a recess 4 around the lid receiving frame formed on the lid receiving frame 2 and the road surface 3 after adjusting the lid of the manhole 1. It is a buried structure, and is mainly composed of an upper layer mat 5, an intermediate layer mat 6, and a lower layer mat 7.

The lid receiving frame 2 has a height-adjusting neck block 2b laminated on the lower surface of the bottom wall and is fixed by insert bolts 2c. The lid receiving frame 2 and the height of the lid receiving frame 2 are determined by the number of layers of the height neck block 2b. The upper surface of the lid 2a is aligned with the upper surface of the road surface 3. A recess 4 is formed between the lower surface of the bottom wall and the peripheral wall, as shown in FIG. It is needless to say that the present invention is applied even when the neck block 2b is not used.

On the other hand, the level adjusting mat of the present invention has a lower layer mat having a plurality of holes which are cut out at least at the lid receiving frame 2 and are placed at the lowermost portion of the recess 4 around the lid receiving frame 2. 7, a hard upper layer mat 5 in which the lid receiving frame 2 is cut out and mounted on the lower layer mat 7, and in the embodiment, an intermediate layer mat mounted between the respective layers 5.7. It consists of six.

The thickness of the mat 5.6.7 in each layer is adjusted so that the upper surface of the upper mat 5 is at the same level as the upper surface of the road surface 3 and the upper surface of the cover 2 a of the manhole 1.

The mat 5.6.7 of each layer uses a hard mat made of recycled rubber as described below in consideration of the compressibility, strength, weight, and the like. Of these, the upper layer used on the road surface 3 side The mat 5 is formed in two parts as shown in FIG. 5, and a joint metal fitting 5a is attached to a joint portion. The intermediate layer mat 6 is divided into four parts. The lower layer mat 7 is a two-part type and is used at the lowermost part of the crushed stone (not shown), and has a mesh structure having a plurality of holes in order to improve the familiarity of the crushed stone mat.

In the embodiment of the present invention, mats of each layer having an average size of 1.4 m × 1.4 m were formed under the following conditions. Upper layer mat weight 16.5 kg × 2 thickness 20 mm tear strength 15 kgf / m ² tensile strength 30 kgf / m ² middle layer mat weight 8.3 kg × 4 thickness 20 mm tear strength 15 kgf / m ² tensile strength 30 kgf / m ² Lower mat Weight 7.0kg × 2 Thickness 15mm

In order to construct the level adjustment mat of the present invention, first, after the height of the lid is adjusted, backfilling is performed. From the state of FIG. 2, crushed stones around the lid receiving frame 2 a and in the recessed portion 4. Then, a lower layer mat 7 is placed as shown in FIG. At this time, since the lower mat 7 is provided with a plurality of holes as described above, the crushed stones that are exposed in an uneven manner enter the holes of the lower mat 7, so that the uneven mounting surface is somewhat reduced. Can be flattened.

Next, the intermediate layer mat 6 is stacked and placed on the lower layer mat 7. The intermediate layer mat 7 compensates for some unevenness of the lower layer mat 7 and performs more flattening.

Then, the upper layer mat 5 is placed on the intermediate layer mat 6 and fixed with the joint fitting 5a. With this upper layer mat 5, the road surface 3, the upper surface of the upper layer mat 5, and the upper surface of the lid 2a become flush, and in this state, the road is opened and the vehicle moves to the next site.

[0021]

[Effect of the invention]

 Since the present invention is configured as described above, compared to the conventional method, there is no need to take asphalt every time the work is completed, so the work time per unit work is greatly reduced. Work can be performed continuously for many places. In addition, this is an innovative and meaningful invention that can prevent the generation of useless industrial waste and contributes to environmental health.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view illustrating a level adjustment mat of the present invention.

FIG. 2 is an external view showing a structure around a lid receiving frame according to the present invention.

FIG. 3 is an external view showing a lower layer mat in the level adjustment mat of the present invention.

FIG. 4 is an external view showing an intermediate layer mat of the level adjustment mat of the present invention.

FIG. 5 is an external view showing an upper layer mat of the level adjustment mat of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Manhole 2 Lid receiving frame 2a Lid 2b Height adjustment neck block 2c Insert bolt 3 Road surface 4 Depression 5 Upper mat 5a Joint fitting 6 Middle mat 7 Lower mat

Claims (4)

[Utility model registration claims] 1. A buried structure which is buried in a concave portion around a lid receiving frame formed on a lid receiving frame and a road surface after adjusting a lid height of a manhole, wherein at least the lid receiving frame portion is cut off to form a buried structure around the lid receiving frame. The lower mat having a plurality of holes to be placed at the lowermost portion of the concave portion, and a hard upper mat that is mounted on the lower mat by notching the lid receiving frame portion, wherein the thickness of the mat of each layer is higher. A level adjusting mat, wherein the upper surface of the mat is adjusted to be the same as the level of the upper surface of the road surface and the upper surface of the manhole cover. 2. The level adjusting mat according to claim 1, wherein an intermediate layer mat is provided between the lower layer mat and the upper layer mat. 3. The level adjusting mat according to claim 1, wherein the mat of each of the layers can be divided. 4. The level-adjusting mat according to claim 1, wherein said upper mat can be divided and a joint is provided at a joint portion.