JPH06158675A - Rubber composition for mounting on paved surface and manhole cover cushioning material - Google Patents

Abstract

PURPOSE:To reduce the difference in wear rate between members by specifying the composition of a rubber composition for mounting on a paved surface and that of an annular cushioning material in covering the upper surface of a cover with the rubber composition and providing the annular cushioning material around it. CONSTITUTION:An embedded manhole cover 1 is covered at its upper surface with a rubber composition 4 for mounting on a paved surface and with an annular manhole cover cushioning material 5 and is embedded while its upper surface is flush with a road surface. The rubber composition 4 and the cushioning material 5 are both composed of 100 parts by weight of general-purpose rubber or a mixture of general-purpose rubber and thermoplastic resin, 70 to 300 parts by weight of soft carbon and 30 to 300 parts by weight of white filling agent. when necessary 5 to 25 parts by weight of black substitute and 0 to 20 parts by weight of cork powder are added thereto. A display portion of characters, etc., made from a material with a wear rate equivalent to that of the cushioning material 5 is embedded in the cushioning material 5 in such a manner as to pass through the material in the direction of thickness. Formation of a gap due to the difference in wear and flowing properties between them can thus be prevented and the loss of the display portion due to wear can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber composition for installing on a pavement surface and a cushioning material for a manhole cover using the rubber composition.

[0002]

2. Description of the Related Art When laying cables, pipes, etc. under a pavement surface such as a pavement, a manhole is often provided because of necessity of repair or the like.

Such a manhole is provided with a metal lid so as not to obstruct the passage of cars, pedestrians and the like. At this time, as shown in FIG. 5, the manhole cover 1 is mounted on the receiving frame 3 installed in the manhole 2 so that the pavement surface 4 and the upper surface 11 of the manhole cover 1 are flush with each other. It was

[0004]

Therefore, there are the following problems.

(1) Since the pavement surface and the lid have different degrees of wear, the pavement surface portion 42 wears first, resulting in a step between the lid 1 and the pavement surface 4.

(2) Due to the difference in flowability between the pavement surface and the manhole in the summer, a step is generated at the boundary between the two.

(3) When a vehicle or the like passes by, vibration is generated and a metallic noise is generated due to the collision between the lid 1 and the receiving frame 3.

(4) Vibration of the lid 1 may damage the pavement surface 41 around the lid.

(5) In a region with a large amount of snow, the cutting edge of the snow remover may be damaged by the metal lid 1 or the receiving frame 3.

For this reason, it is often necessary to adjust the height of the lid according to the height of the paved surface.

The above problems are caused by the fact that the manhole cover is exposed on the pavement surface, and the applicant of the present invention invented a construction method in which the manhole cover is embedded in the pavement surface. FIG. 1 is a cross-sectional view when the construction method is carried out. As is clear from this figure, the receiving frame 3 is formed (deeply) below the horizontal plane of the pavement surface 4, and the manhole cover 1 is It is placed on the receiving frame 3. A ring-shaped rubber cushioning material 5 is placed on the upper portion of the manhole cover 1, and the inside of the ring of the cushioning material 5 is paved.

The cushioning material 5 is for indicating the position of the manhole 2 buried in the road surface 4.

By adopting the above-mentioned construction method, as shown in the perspective view of the pavement surface after construction in FIG. 2, the lid 1 is not exposed on the pavement surface 4 and the car passes over the manhole. Even if it does, there is no risk of vibration, metal noise caused by the collision between the lid and the receiving frame, and damage to the pavement surface in the peripheral portion. Further, there is an advantage that there is no fear of damaging the cutting edge during the operation of the snow plow.

However, since the paved surface 4 and the cushioning material 5 have different degrees of wear, it is inevitable that a step difference is unavoidable due to the difference in the degree of wear between the paved surface and the cushioning material.

[0015]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and by suppressing the difference in the degree of wear between the paved surface and the cushioning material to a minimum, the occurrence of a step caused by wear is prevented. It is an object to provide a rubber composition and a cushioning material using the rubber composition.

[0016]

In order to achieve the above object, a rubber composition for paving a surface according to the present invention comprises a general-purpose rubber base material or a mixture of a general-purpose rubber base material and a thermoplastic resin 100.
70 to 300 parts by weight of soft carbon and 30 to 300 parts by weight of white filler are added to the parts by weight.

The second rubber composition for paving a surface according to the present invention contains 7 parts by weight of soft carbon based on 100 parts by weight of a general-purpose rubber base material or a mixture of a general-purpose rubber base material and a thermoplastic resin.
It is characterized in that 0 to 300 parts by weight, 30 to 300 parts by weight of white filler are added, and further 5 to 25 parts by weight of black sub and 0 to 20 parts by weight of cork powder are added.

The present invention also provides a cushioning material for a manhole cover using the above composition, wherein soft carbon 70 is added to 100 parts by weight of a general-purpose rubber base material or a mixture of a general-purpose rubber base material and a thermoplastic resin. ˜300 parts by weight and a white filler 30 to 300 parts by weight are added to a ring-shaped manhole cover cushioning material main body, which has the same or almost the same degree of wear as the main body and has a predetermined character or pattern or a combination thereof. It is characterized in that a display portion formed so as to penetrate therethrough in the thickness direction is embedded.

The second manhole cover cushioning material according to the present invention contains 70 to 30 parts of soft carbon based on 100 parts by weight of a general-purpose rubber base material or a mixture of a general-purpose rubber base material and a thermoplastic resin.
0 parts by weight, 30 to 300 parts by weight of white filler are added, and further 5 to 25 parts by weight of black sub and cork powder 0 to
Indication that the buffer material for the ring-shaped manhole lid added with 20 parts by weight has the same or substantially the same degree of wear as the above-mentioned main body, and has a predetermined character or pattern or a combination thereof penetrating in the thickness direction. It is characterized in that the part is buried.

[0020]

DETAILED DESCRIPTION OF THE INVENTION The rubber composition for paving the surface according to the present invention is required to have a degree of wear which is substantially the same as or close to that of the paving surface. In order to achieve this requirement, a rubber as a base material used in the rubber composition for paving the surface according to the present invention is added with a wear modifier.

The rubber as the base material is not basically limited in the present invention, and general purpose rubbers such as isoprene rubber, chloroprene rubber, nitrile rubber and natural rubber can be effectively used.

As the thermoplastic resin mixed with this general-purpose rubber base material, ethylene-vinyl acetate copolymer, polyurethane resin, ethylene butene polymer, styrene resin, chlorosulfonated polyethylene, ethylene propylene polymer, etc., having a softening temperature of 100 ° C. The following thermoplastic resins can be used.

The above-mentioned thermoplastic resin has a softening point of 100 ° C. or lower, but if it exceeds 100 ° C., it cannot be expected that the pavement surface will be constant due to the temperature on the road and the vehicle load.

When the above-mentioned thermoplastic resin is mixed with a general-purpose rubber base material, 0-9 when the whole mixture is 100.
It is added in a proportion of 0% by weight. If it exceeds 90% by weight,
Due to the characteristics of the thermoplastic resin due to the temperature on the road and the vehicle load, it deforms and causes maintenance problems such as opening and closing the lid.

Soft carbon and a white filler are used as wear modifiers added to such a general-purpose rubber base material or a mixture of a general-purpose rubber base material and a thermoplastic resin.

Soft carbon has a larger particle size than hard carbon and has a particle size in the range of about 40 mμ to 210 mμ, whereas hard carbon is used as a reinforcing material for rubber, whereas soft carbon is a filler. Is commonly used as. The soft carbon in the present invention is
It is added to increase the wear of the above-mentioned general-purpose rubber base material or a mixture of a general-purpose rubber base material and a thermoplastic resin, and the addition amount is 100 parts by weight of a general-purpose rubber base material or a mixture of a general-purpose rubber base material and a thermoplastic resin. On the other hand, it is 70 to 300 parts by weight. If it is less than 70 parts by weight, the effect of adjusting wear is not obtained, while if it exceeds 300 parts by weight, rubber properties are significantly deteriorated.
This is because there is a risk that it will become unusable.

As such soft carbon, for example, first extruding F (FEF), high modulus F (HMF), general purpose F
(GPF), semi-line forcing (SRF), fine thermal (FT), medium thermal (Mt), etc. can be used.

The particle size of this soft carbon powder is preferably 30 to 200 mμ. If it is less than 30 mμ, the abrasion of the rubber base material is small, and the degree of abrasion with the pavement surface may be significantly different. On the other hand, if it exceeds 200 mμ, the characteristics of the rubber substrate are impaired and the abrasion degree becomes too large. There is a fear.

The white filler powder combined with the soft carbon powder is added to complement the soft carbon powder. The addition amount is 30 to 300 parts by weight with respect to 100 parts by weight of a general-purpose rubber base material or a mixture of a general-purpose rubber base material and a thermoplastic resin. If it is less than 30 parts by weight, the effect of adjusting the wear is not obtained, while if it exceeds 300 parts by weight, the rubber properties are remarkably deteriorated and there is a fear that it cannot be used. Generally, when the addition amount of the soft carbon powder is large, the addition amount of the white filler powder is small, and when the addition amount of the soft carbon powder is small, the addition amount of the white filler powder tends to be large. Has no reinforcing property, the wear property does not change due to the difference in particle size.

As the white filler, one or more of calcium carbonate, talc, clay, diatomaceous earth, barium sulfate and the like can be used.

Since the white filler has no reinforcing property, the wear resistance does not change depending on the difference in particle size.

With respect to the rubber composition for paving the surface as described above, 5 to 25 parts by weight of black sub and 0 to cork powder are further added.
20 parts by weight can be added.

The black slab and cork powder are added in order to make the general-purpose rubber base material or the mixture of the general-purpose rubber base material and the thermoplastic resin easy to wear.
5 parts by weight. If it is less than 5 parts by weight, the effect of addition is not obtained, while if it exceeds 25 parts by weight, abrasion of the rubber base material tends to increase.

The amount of cork powder added is 0 to 20 parts by weight. If it exceeds 20 parts by weight, the properties of the rubber will be significantly deteriorated and the abrasion will be increased.

Further, the particle size of the cork powder is 0.1 to 0.
It is good that it is 3 mm. If it is less than 0.1 mm, the abrasion may not be so large that the degree of abrasion with the pavement surface may be different. On the other hand, if it exceeds 0.3 mm, the rubber properties are remarkably deteriorated.

The particle size of the above-mentioned wear modifier is large as compared with the commonly used particle size. This is to adjust the degree of wear in the same manner as the paved surface.

The rubber composition for paving the surface according to the present invention comprises
Although it has been described as a cushioning material for manholes, it is not limited to this, and it is obvious that it can be widely used as a material for a rubber component such as being embedded in a pavement surface.

The present invention also discloses a manhole cushioning material using the above rubber composition. As shown in FIGS. 2 and 3, a ring-shaped manhole cushioning material produced from the rubber composition as described above. Predetermined characters on the material body 51,
The display unit 52 is provided with a pattern or a combination thereof (hereinafter, referred to as a mark), for example, a company emblem or the like.

As shown in FIG. 4 which is a sectional view taken along the line AA of FIG. 4, the display section 52 comprises a mark section 521 for expressing characters, patterns or a combination thereof, and a display section main body 522. The chapter portion 521 is formed so as to penetrate through the entire thickness direction of the display portion 52, while the display portion main body 522 has a tapered cross section.

The display portion 52 as described above is provided in the cushioning material main body 51.
Are fitted into the mounting holes 511 formed through in the thickness direction thereof and adhered to each other. In this case, the taper is formed so that the taper gradually decreases to the surface (the side exposed on the pavement surface) of the cushioning material main body 51.

As described above, by making the side exposed on the pavement surface a taper taper, there is an advantage that it is difficult for the display portion 52 to be pulled out in the direction of the pavement surface.

The display unit 52 is used to display a mark indicating the owner or manager of the manhole. Therefore, it is required that the mark such as the company emblem displayed on the display unit 52 does not disappear due to wear or the like. In consideration of the above facts, in the present invention, the mark portion 521 is formed so as to penetrate the entire thickness of the display portion 52. Therefore, the cushioning material main body 51 and the display unit 52
Even if the wear gradually increases, the cushioning material main body 51 and the display unit 52
There is no danger of the mark disappearing unless it is worn and lost.

The display portion 52 as described above is provided with the cushioning material main body 51.
It is necessary to wear the same or almost the same.
Therefore, the cushioning material body is manufactured by using the same wear material as that of the cushioning material body. For example, the same or similar rubber composition in which only the cushioning material and the pigment are changed can be used, and the rubber composition can be produced by a method such as two-color molding.

[0044]

Example 1 A cushioning material for a manhole cover was produced using a rubber composition for paving a surface having the following composition.

Composition 1 Chloroprene rubber 100 parts by weight Soft carbon 210 parts by weight (average particle size 90 mμ) Calcium carbonate 30 parts by weight

Composition 2 Chloroprene rubber 100 parts by weight Soft carbon 210 parts by weight (average particle size 90 mμ) Calcium carbonate 30 parts by weight Black sub 25 parts by weight

Composition 3 Chloroprene rubber 100 parts by weight Soft carbon 70 parts by weight (average particle size 90 mμ) Calcium carbonate 300 parts by weight Black sub 25 parts by weight Cork powder 20 parts by weight (average particle size 0.10 to 0.30 mm)

A cushioning material for a manhole cover was manufactured by using the above composition 1, composition 2 and composition 3. The main body of the display part of the display part was the same rubber composition as the composition 1, the composition 2 and the composition 3, and the mark part was the composition in which the pigment of each of the compositions was changed.

Abrasion degree was measured by running 1000 times with a spike wheel having a load of 20 kg on the cushioning material of composition 1, composition 2 and composition 3 and dense-grained ascon (pavement surface). The test was carried out in a dry state and at a temperature of -10 ° C.

As a result, the wear amounts of Composition 1, Composition 2 and Composition 3 were 1.01 cm ² , 1.10 cm ² and 1.3, respectively.
5 cm ² , while the wear amount of Ascon is 0.70
It was 1.30 cm ² .

[0051]

Example 2 A sample was manufactured using a rubber composition for paving a surface according to the following composition.

Composition 4 Chloroprene rubber 50 parts by weight Thermoplastic resin 50 parts by weight (ethylene acetic acid copolymer) Soft carbon 100 parts by weight (average particle size 90 mμ) Calcium carbonate 50 parts by weight

As a sample, size 300 mm × 300
Create mm x 50 mm (thickness), temperature 60 ℃, time 2
When the dynamic stability, which is an index of fluidity, was measured with time, it was 10500 times / mm.

Further, assuming a tire of an automobile as a wear wheel, urethane rubber was used and a taper wear test was conducted.

The results are shown in Table 1 below.

[0056]

[Table 1]

[0057]

EFFECTS OF THE INVENTION The rubber composition for paving the surface according to the present invention has almost the same degree of wear and flowability as the paving surface, and therefore, even when the rubber part manufactured by the rubber composition is embedded, There is an advantage that a step due to difference in wear and flowability is not generated.

Further, according to the manhole cover cushioning material of the present invention, since the display portion formed by penetrating a predetermined character or pattern or a combination thereof in the thickness direction is embedded, the manhole owner There is an advantage that the marks of managers, etc. do not disappear due to wear.

[0059]

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a usage state of a cushioning material for a manhole cover.

FIG. 2 is a perspective view of the manhole after construction.

FIG. 3 is a partial front view of a cushioning material for a manhole cover of the present invention.

4 is a sectional view taken along line AA of FIG.

FIG. 5 is a cross-sectional view of a conventional manhole installation state.

[Explanation of symbols]

 1 Manhole Cover 2 Manhole 3 Receiving Frame 4 Pavement Surface 5 Manhole Cover Cushioning Material 51 Cushioning Material Main Body 52 Display

Front page continued (72) Inventor Tsutomu Sanshin 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Corporation (72) Naoki Fukushi 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nihon Telegraph Phone Co., Ltd.

Claims (4)

[Claims] 1. A pavement characterized by adding 70 to 300 parts by weight of soft carbon and 30 to 300 parts by weight of a white filler to 100 parts by weight of a general-purpose rubber base material or a mixture of a general-purpose rubber base material and a thermoplastic resin. Rubber composition for surface installation. 2. 70 to 300 parts by weight of soft carbon and 30 to 300 parts by weight of white filler are added to 100 parts by weight of a general-purpose rubber base material or a mixture of a general-purpose rubber base material and a thermoplastic resin, and a black sub 5 is further added. -25 parts by weight and 0 to 20 parts by weight of cork powder are added. 3. A cushion for a ring-shaped manhole lid, wherein 70 to 300 parts by weight of soft carbon and 30 to 300 parts by weight of a white filler are added to 100 parts by weight of a general-purpose rubber base material or a mixture of a general-purpose rubber base material and a thermoplastic resin. A manhole cover having a material body having the same or substantially the same degree of wear as the body and having a display portion formed by penetrating a predetermined character or pattern or a combination thereof in the thickness direction. Cushioning material. 4. To 100 parts by weight of a general-purpose rubber base material or a mixture of a general-purpose rubber base material and a thermoplastic resin, 70 to 300 parts by weight of soft carbon and 30 to 300 parts by weight of a white filler are added, and a black sub 5 is further added. .About.25 parts by weight and 0 to 20 parts by weight of cork powder are added to the main body of the cushioning material for the ring-shaped manhole lid, which has the same or almost the same degree of wear as the main body and has a predetermined character or pattern or a combination thereof. A cushioning material for a manhole lid, characterized in that a display portion formed so as to penetrate in the vertical direction is embedded.