JPH08151650A - Packing for protecting manhole cover adn its installation method - Google Patents

Abstract

PURPOSE: To increase vibration resistance and compression resistance by cutting out impregnated cloth made by impregnating cloth having compression resistance with an elastic resin according to the inner surfaces of a manhole support frame and the iron cover supporting surface of a support frame, and laminating and sticking it in a specified thickness. CONSTITUTION: An impregnated part 11 of an impregnated cloth for side surface 1 is made in contact with and stuck on the inner surfaces 52 of a manhole support frame 5 laminatedly so that its thickness becomes that equals a clearance between a manhole iron cover and the cloth. Next, in this case, connecting threads 12 extended from the impregnated part 11 are stuck on the iron cover support surfaces of a support frame 5. Also the impregnated cloth for support surface is stuck on the connecting threads 12 laminatedly by desired layers so that a height difference is not produced between the ground surface and the iron cover. Then the vibration of the manhole cover is absorbed by elastic resin soaked in the cloth 1 so as to prevent wear due to contact of it with the support frame. In addition, the cloth 1 with compression resistance prevents a packing itself from being compression-deformed permanently so as to prevent chattering of the cover and the production of height difference. Thus the packing can compensate for the degree of wear and can prevent damage to the manhole.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manhole iron cover protection, that is, vibration isolation, position adjustment, and foreign matter contamination prevention technique.

[0002]

2. Description of the Related Art Since a manhole is usually installed underground on a road, the manhole cover at the doorway is always affected by the outside world. In particular, in the manhole cover that opens on the road with a large amount of traffic, the iron cover vibrates every time a car is passing, and it collides with the receiving frame and wears out. When the iron lid and the receiving frame become worn, the iron lid will dance greatly when passing through the car, which may damage the lid or the receiving frame, and in some cases, the lid may come off and cause an automobile accident. It was In addition, the sound generated each time a vehicle passes by became extremely loud, causing complaints due to noise problems.

FIG. 4 is a diagram showing a conventional manhole opening. In the figure, only one side cross section of the manhole receiving frame and the lid is shown. In the figure, 4 is a manhole iron cover, and 5 is a receiving frame. The iron lid 4 is placed on the iron lid bearing surface 51 of the receiving frame 5. In a conventional iron lid, a packing 31 made of an ethylene vinyl acetate copolymer (hereinafter referred to as EVA) is attached to prevent vibration. In the figure, 8 indicates an inner lid for locking and 9 indicates the ground.

In the conventional EVA packing 31, the packing is misaligned due to vibration due to weighting and passing of the automobile.
Sometimes it didn't work perfectly. Further, since permanent compression strain is generated in the EVA itself, a step 33 is formed between the ground 9 and the plane of the iron lid 4, resulting in a vicious cycle of further increasing the impact when the vehicle travels.

Further, the vibration caused by the passage of the vehicle causes wear on the side surface 52 of the iron lid 4 and the receiving frame 5 which is in contact with the iron lid 4 and causes a gap 32. When gravel, pebbles, and the like enter the gap 32, the gravel and the like damage the EVA packing 31 and also cause a crack in the lid 4 and the receiving frame 5. In addition, sand and pebbles were mixed into the EVA packing itself to be assimilated, and the EVA packing was replaced every time the iron lid was opened because it could not be used thereafter. In order to prevent the invasion of the gravel or the like, a soft polyurethane foam is injected into the gap 32. However, polyurethane foam has a large compression strain,
Immediately, the iron lid shifts in the direction of travel of the car, leaving a gap on the opposite side. Further, this polyurethane foam is damaged every time the manhole cover is opened and cannot be used continuously. Therefore, the injection work of the polyurethane foam must be repeated every time the work is performed in the manhole.

[0006]

The reason why the problems cannot be solved by these conventional techniques is considered to be as follows. That is, firstly, it is argued that the conventional packing uses a material having a relatively large compressive strain because it has a vibration damping function. These EVA
With polyurethane foam, it is unavoidable that gaps and gaps will reoccur. On the other hand, if a hard member is used instead of this, the packing itself will be immediately damaged, and the fragments will be scattered on the road, causing a danger.

Secondly, since the conventional EVA packing is installed on the receiving frame of the existing one, it is not possible to cope with the degree of wear of the manhole cover. The amount of wear of the manhole cover varies depending on the installation location, and the degree of wear is not uniform depending on the traveling direction of the automobile. On the other hand, the existing EVA packing does not completely eliminate steps and gaps.

In view of the above problems, the present invention provides a packing which has both vibration proof and anti-compression properties and is not deteriorated even when the manhole cover is repeatedly opened and closed. The present invention also provides a packing laying method that can be applied to individual manhole covers having different wear states.

[0009]

In order to solve the above problems, the packing for a manhole cover according to the present invention is constructed by using an impregnated cloth obtained by impregnating a cloth having anti-compression property with a resin having elasticity. In this impregnated cloth, the side surface impregnated cloth 1 having a width corresponding to the height of the inner side surface 52 of the manhole receiving frame and the iron cover supporting surface 51 of the manhole receiving frame are cut.
The bottom surface impregnated cloth 2 is cut out in accordance with the shape of. The packing of the present invention is characterized by being formed by shaping each impregnated cloth into a predetermined thickness. Here, the “compressible cloth” is a cloth that has not been subjected to special processing for vibration damping such as felt processing. Further, if the cloth is previously subjected to compression processing, the anti-compression property is further enhanced. Further, the term "corresponding" does not necessarily mean the same width or the same shape, and includes a case where a slightly smaller size or a larger size is used as needed. The "predetermined thickness" means the thickness corresponding to the width of the gap 32 for the side surface impregnated cloth, and the thickness corresponding to the height of the step 33 for the bottom surface impregnated cloth. Say it. Further, "shaping" to a predetermined thickness may be a single layer or a plurality of layers. Furthermore, when the sizes of the gap 32 and the step 33 are not uniform,
It may be laminated only partially.

The packing laying method of the present invention is a method of integrally laying the above-mentioned packing into a shape corresponding to the wear condition of the iron lid and the receiving frame. In the packing laying method of the present invention, the side surface impregnated cloth 1 including the band-shaped impregnated portion 11 having a width corresponding to the height of the inner side surface 52 of the manhole receiving frame 5 and the plurality of connecting threads 12, and the manhole receiving frame. 5
The bearing surface impregnated cloth 2 cut out in accordance with the shape of the iron lid bearing surface 51 is used. The packing is generated by first setting the impregnated portion 11 of the side surface impregnated cloth 1 on the inner side surface 52 of the manhole receiving frame 5 and the connecting thread 12 on the manhole receiving frame 5.
On the iron-cover bearing surface 51 of each of them, so as to be in contact with each other, and to have a thickness corresponding to the width of the gap 32.
Stick more than one. Next, the impregnating cloth 2 for the bearing surface is laid on the connecting thread 12 in a single layer or a plurality of layers so as to have a thickness corresponding to the height of the step 33, thereby completing the process. Here, "on the iron lid bearing surface 51" and "contacting" means that the connecting thread 12 is directly brought into contact with the upper lid bearing surface 51,
This may be either a case where the impregnating cloth 2 for the bearing surface is laid in advance on the bearing surface of the upper lid and the surface is brought into contact therewith.

[0011]

In the packing for the manhole cover of the present invention, the elastic resin contained in the impregnated cloth absorbs the vibration of the manhole cover well and prevents the abrasion due to the contact with the receiving frame. On the other hand, the cloth having the anti-compression property serves as the core of the impregnated cloth to prevent the permanent compression strain of the packing itself. Therefore, the manhole cover does not dance in the receiving frame, the bulkiness of the packing is not reduced, and the step 33 is not generated between the cover and the ground.

Further, in the packing laying method of the present invention, the impregnating cloth 2 for the bearing surface is prepared on the spot according to the degree of wear of the iron lid.
Since they can be stacked, the step 33 can be accurately eliminated at the laying site. Further, in the packing laying method of the present invention, the connecting yarn 1 extended from the side surface impregnated cloth 1
Since the impregnated cloth 2 for the bearing surface is laid on the support 2, the iron lid and the automobile are loaded from above, so that the packing is integrally formed, and the packing is not damaged even when the iron lid is opened and closed. It can be used continuously.

[0013]

Embodiments of the present invention will now be described in detail with reference to the drawings. 1 and 2 are views showing steps in one embodiment of the packing laying method of the present invention. In the drawing, 1 is a side surface impregnated cloth, 2 is a bearing surface impregnated cloth, 4 is a manhole iron lid, and 5 is a receiving frame, all of which are shown in cross section.

In the packing laying method of this embodiment,
The impregnated cloth has a thickness of 0.51 mm, a weight of 350 g / square meter, a tensile strength of 350 × 350 kg / 3 cm, and an elongation of 16 ×.
15%, tear strength 90x90kg, water permeability 0.0146
A polyester cloth made of plain weave of cm / sec is used as a core (Tensile strength, elongation and tear strength are all JI
S L1096 test method, water permeability is JIS A1218
2 test method). This cloth is a geotextile normally used for civil engineering works.

The cloth used for the side surface impregnated cloth 1 is obtained by cutting the polyester cloth into a strip having a length of 3000 mm and a width of 55 mm, and removing warp yarns from the end of the width 55 mm except for some of the end yarns of 25 mm. It was done. FIG. 3 is a partially enlarged view schematically showing the details. In the figure, the thickness of the thread is drawn thinner than the actual one in order to clearly display the texture of the thread. Actually, the cloth has a thread thickness of about 1.0
A thread of mm × 1.0 mm woven orthogonally at a weave density of 6 × 6 threads / square centimeter is used by flattening the thread to 0.4 mm × 1.3 mm by means such as heat compression. The cloth has a strip shape extending in the vertical direction in the figure, but only a part thereof is shown in the figure. The weft yarn in the portion where the warp yarn is removed constitutes the connecting yarn 12. The warp yarn 13 at the end is left in order to prevent the connecting yarn 12 from fraying. The warp yarn 13 may be left in the middle between the plain weave portion 10 and the outermost end as well as the outermost end. Approximately 63 ml of urethane resin is impregnated into the portion 10 left in the plain weave state so as to have a uniform thickness of 1 mm to form an impregnated portion 11, and the side surface impregnated cloth 1 is completed.
This urethane resin is obtained by adding a curing agent to a liquid urethane elastomer for casting.

The cloth used as the impregnating cloth 2 for the bearing surface is made of the polyester cloth having a length and width of 500 mm and the urethane elastomer with a curing agent added, and approximately 175 ml of the cloth is impregnated to a uniform thickness of 1 mm. To cure. This is cut out into an arc shape of a 1/6 circle so as to correspond to the shape of the upper lid bearing surface 51 of the manhole receiving frame, and is used as a part of the bearing surface impregnated cloth.

The laying work is started after the manhole cover 4 is opened and removed, and then the receiving frame 5 is cleaned. After applying an adhesive to the inner side surface 52 of the manhole receiving frame, the impregnated portion 11 of the side surface impregnated cloth 1 is attached using a double-sided adhesive tape. At that time, the side surface impregnated cloth 1 is
The connecting thread 12 is installed so as to contact the upper lid bearing surface 51 of the receiving frame 5. The adhesive used is an epoxy-based synthetic resin adhesive. In the embodiment shown in FIG. 1 and FIG. 2, the side surface impregnated cloth 1 is attached in a single layer.
You may stick more than twice according to the width of. Alternatively, the amount of urethane resin may be increased in the later-described urethane resin pouring work (before and after returning the iron lid 4 to the receiving frame 5; see paragraph number 20).

Here, the iron lid 4 is once returned to the receiving frame 5, and the heights of the steps 33 are measured at six points on the circumference of the iron lid 4. The iron lid 4 is removed again, and the portion of the back surface and the side surface that comes into contact with the receiving frame is coated with a fluorine-based mold release agent that has been sprinkled into a sponge. Masking is performed with the kraft paper adhesive tape 7 so that the liquid urethane elastomer does not flow into the inner groove of the receiving frame 5. The kraft paper adhesive tape 7 is commercially available, and is obtained by subjecting kraft paper to extrusion coating with polyethylene, and then applying silicone onto the kraft paper for back treatment. In order to improve the peelability from the liquid urethane elastomer, an adhesive tape 7
Has its upper projecting end folded back to form both sides of the back surface to form a flange. When the adhesive tape 7 is attached, the double-sided tape 6 is sandwiched and adhered to reinforce the adhesive force.

Next, a mixture of the liquid urethane elastomer and the curing agent is thinly applied on the impregnated portion of the side surface impregnated cloth 1 adhered to the receiving frame 5 and the connecting thread 12. On top of that, the required number of parts of the impregnated cloth 2 for bearing surface (1/6 arc shape) are laid according to the height of the measured step. At this time, if the height of the step is different at each measured point, the number of sheets to be laid according to it is
Adjust for each part. FIG. 2 schematically shows a state in which four bearing surface impregnated cloths 2 are stacked,
The actual thickness of the impregnated cloths 1 and 2 is 1 mm.

Further, the bearing surface impregnated cloth 2 is laid, and then a mixture of the liquid urethane elastomer and the curing agent is poured. When this liquid urethane elastomer begins to harden, remove the double-sided tape 6 and the gum tape 7,
The back surface of the iron lid 4 is coated again with the release agent, and the iron lid is returned to the center of the receiving frame so that the deviation does not occur. After the iron lid 4 is closed, the mixture of the urethane elastomer and the curing agent is further injected into the upper remaining portion 3 of the gap 32, and the extra portion leached on the surface is removed with a spatula or the like. The surroundings are cleaned and the work is completed.

The side surface impregnated cloth 1, the bearing surface impregnated cloth 2, and the urethane elastomers injected into the upper residual portion 3 of the gap 32 are integrated by being subjected to weight and vibration due to the passage of a vehicle, and are integrated into the packing of the present invention. To make up.

In this embodiment, the cloth is impregnated with the urethane elastomer for liquid casting as the resin having elasticity, because this is easy to handle at the construction site.
The resin that can be used is not necessarily limited to the liquid casting urethane elastomer. If it has heat resistance, cold resistance, water resistance, oil resistance, weather resistance and the required elasticity,
Other materials may be used. As a usable material, polysulfide rubber, silicone rubber, various thermoplastic elastomers such as SBC and the like can be considered, but those having a low compression set are preferable.

In the present embodiment, the impregnated cloths 1 and 2 have a thickness of 1 mm, and an appropriate number of them are laminated to form a packing, but the embodiment is not necessarily limited to this, and an appropriate thickness is adopted. It is also possible to use polyester cloth to change the thickness of the impregnated cloth. Further, the material of the cloth used is not limited to the one made of polyester, and other materials such as polypropylene and vinylon may be used as long as they satisfy the condition that they are excellent in anti-compression property and corrosion resistance. . Further, in the present embodiment, the cloth used is a plain weave for facilitating the processing of the connecting yarn 12, but the replacement of this with a non-woven cloth or other cloth does not depart from the scope of the present invention.

In the manhole iron lid which is open to the road, the receiving frame 5 is worn while being biased toward the traffic direction of the automobile, while the iron lid 4 is worn while rotating in the receiving frame 5, The surroundings wear out evenly. Therefore, the gap 3
The width of 2 is not always constant at each point on the circumference of the iron lid. In such a case, the side surface impregnated cloth 1 can be partially laminated to correspond to the width of the gap.

Further, in this embodiment, the connecting thread 12 is brought into direct contact with the upper lid bearing surface 51. This is laid on the bearing surface of the upper lid in advance with the impregnating cloth 2 for the bearing surface, and then the connecting thread 1
If 2 is contacted, and the impregnated cloth 2 for the bearing surface is laid on top of it, it becomes a so-called sandwich shape, which contributes to a more integrated packing. Further, when the height of the step 33 due to wear is only partially deep, the parts of the impregnating cloth 2 for the bearing surface are laid only on that part, and the connecting thread 12 is brought into contact with it, and the height is increased. May be used for homogenization of

[0026]

The packing for the manhole cover of the present invention is
Impregnated cloth for side surface 1 cut out in a band shape having a width corresponding to the height of the inner side surface of the manhole receiving frame, and impregnated cloth for bottom surface consisting of parts cut out corresponding to the shape of the iron lid bearing surface of the manhole receiving frame Both of them and 2 can be integrated to eliminate the gap and the step of the manhole iron cover. Further, the packing for a manhole cover of the present invention absorbs vibrations caused by the passage of an automobile, but does not cause distortion due to compression. Therefore, gravel or the like does not enter the gap between the iron lid and the receiving frame, which prevents the iron lid and the receiving frame from being damaged, and the packing itself does not deteriorate.

In the packing laying method of the present invention,
Since the impregnating cloth 2 for the bearing surface can be stacked on the spot according to the degree of wear of the iron lid, the step 33 can be accurately set at the laying site.
Can be eliminated. Further, in the packing laying method of the present invention, it is possible to appropriately eliminate the gap 32 which is unevenly generated depending on the traveling direction of the automobile.
In addition, in the packing laying method of the present invention, since the bearing surface impregnated cloth 2 is laid on the connecting yarn 12 extending from the side surface impregnated cloth 1, the iron lid and the automobile are loaded from above. , The packing is integrally generated. When the iron lid is opened and closed, the packing is not damaged, and the work of injecting resin again each time it is opened and closed becomes unnecessary. As a result, the gaps and steps of the manhole iron lid are antipermanently eliminated, and as a result, the iron lid and the receiving frame can be protected and their damage can be prevented.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view illustrating a packing laying method according to an embodiment of the present invention and showing a packing production process of the present invention.

FIG. 2 is a partial cross-sectional view illustrating a packing laying method according to an embodiment of the present invention and showing a completed state of the packing of the present invention.

FIG. 3 is a diagram schematically showing details of a cloth used as an impregnated cloth according to an example of the present invention.

FIG. 4 is a partial cross-sectional view showing a state of a conventional manhole iron cover.

[Explanation of symbols]

 1 Side Impregnated Cloth 2 Bearing Surface Impregnated Cloth 3 Upper Gap 4 Manhole Iron Lid 5 Manhole Receiving Frame 6 Double-sided Tape 7 Kraft Paper Adhesive Tape 8 Locking Inner Lid 9 Ground 10 Plain Weave Part 11 Impregnation Part 12 Connecting Thread 13 Warp End Part 31 EVA packing 32 Gap 33 Step 51 Upper lid support surface 52 Inner side surface of receiving frame

Claims (2)

[Claims] 1. A strip-shaped side surface impregnating cloth having a width corresponding to the height of the inner side surface of the manhole receiving frame, and a bearing surface impregnating cloth having a shape corresponding to the shape of the lid supporting surface of the manhole receiving frame. In the packing for manhole cover, the side surface impregnated cloth has a thickness corresponding to a width of a gap between the manhole cover and the receiving frame, and the bearing surface impregnated cloth has a step difference between the manhole cover and the receiving frame. A packing for a manhole cover, which is formed into a thickness corresponding to a height, and each of the impregnated cloths is obtained by impregnating cloth with an elastic resin. 2. A side surface impregnated cloth comprising a band-shaped impregnated portion having a width corresponding to the height of the inner surface of the manhole receiving frame and a plurality of connecting threads, the impregnated portion being on the inner surface of the manhole receiving frame. Single or double so that the connecting thread is in contact with the lid supporting surface of the manhole receiving frame and has a thickness corresponding to the width of the gap between the manhole cover and the receiving frame.
Put more than double weight, and cut out the impregnating cloth for bearing surface cut out according to the shape of the lid supporting surface of the manhole receiving frame so that it has a thickness corresponding to the height of the step between the manhole lid and the receiving frame on the connecting thread. A method for laying a packing for a manhole cover by laying it in a single layer or a double layer or more, wherein the impregnated portion of the side surface impregnated cloth and the bearing surface impregnated cloth are made by impregnating a cloth with an elastic resin. A method for laying packing for a manhole cover, which is characterized by being a thing.