JP2015067982A - Rubber concrete for road bridge and construction method therefor, and expansion device using rubber concrete for road bridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide rubber concrete that is adapted to an expansion device for road bridges and exhibiting literal elasticity, namely deformation properties and reconstruction properties, and a construction method therefor, and to provide the expansion device using the same.SOLUTION: Rubber concrete for road bridges is constituted by using a low hardness rubber material curing under the ordinary temperature and aggregate, in which the cured rubber hardness of the low hardness rubber material is in a range of Hs=5-50 degrees. Also, an expansion device using the rubber concrete for the road bridges is constituted by including: a dead space between the surface of adjacent floor slabs 11, 12 and the surface of the side surface of pavements 13, 14 constructed on the floor slabs; the rubber concrete constructed in the dead space, constituted by a low hardness rubber material curing under the ordinary temperature and aggregate, and in which the cured rubber hardness of the low hardness rubber material is in a range of Hs=5-50 degrees; and adhesive means for joining the rubber concrete coming into contact with the floor slab and the pavement by adhesives.

Description

  The present invention relates to rubber concrete for road bridges, its construction method, and a telescopic device using the same, and is particularly applied to a joint portion between floor slabs.

  It is well known that steps are easily formed at the joints that make up the road surface, such as between the floor slabs of road bridges, and if such steps are formed, it can cause impact and vibration to the traveling vehicle, and can also be a source of noise. It is as follows. In addition, the problem due to the step does not only extend to vehicle traffic, etc., but also causes the seam part to be damaged and cause water leakage, and it also affects each other such that it increases the effect on the vehicle. Become. For this reason, installing an expansion-contraction apparatus in the joint part is performed.

  For example, FIG. 8 illustrates an expansion device for a road bridge, and is an example in which the expansion device c is installed in a gap (gap) between the bridge beam a, the bridge beam b, and the connecting road d. The bridge girders a and b are provided with a gap between them in order to expand and contract due to changes in temperature, etc., but this gap induces the problem as described above, so that this is covered to facilitate the movement of vehicles and pedestrians. It is necessary to plan. And in order to absorb the expansion and contraction between play, the expansion-contraction apparatus c has been provided conventionally. In addition, the edge part processing e which used the corrugated steel joint which can respond to the expansion-contraction of an expansion-contraction apparatus as shown in FIG.

  The present inventor has also worked on such a telescopic device and has filed patent applications for certain results. Japanese Unexamined Patent Application Publication Nos. 2008-25320 and 2008-25324 are some of the results. These are expansion and contraction devices that solve the problem of level difference and are interposed between the floor slabs. On the other hand, in the conventional expansion and contraction device applied to the joint between floor slabs, mixing and adhering rubber powder and rubber chip containing asphalt and aggregate have been performed. However, since asphalt is a plastic material and rubber powder and rubber chips have been vulcanized, the aggregate cannot be bonded with the rubber after vulcanization and curing even if rubber is mixed. In addition, the stretchability may improve, but the change in the shrinkage is hardly seen and remains deformed, so the road surface is smoothed as the load of the passing vehicle is applied. That is, since it expands and does not contract, it is difficult to call it a telescopic device. However, in this technical field, such a device is conventionally used as a telescopic device. The term “rubber” generally refers to a polymer that has been modified by processing raw materials, and the above description of rubber is used in this sense.

  In addition, the expansion and contraction device using the conventional rubber powder and asphalt containing rubber chips tends to cause wrinkles, which is also evidence of plastic deformation. In addition, it has been pointed out that conventional rubber powder and asphalt containing rubber chips are easy to peel off from the adhesive surface, causing water leakage, increasing vibration, and generating noise in a short period of only 1 or 2 years. That is, the conventional expansion and contraction device in which asphalt is the main material and rubber powder and rubber chips are mixed therewith has a problem of insufficient strength and tends to cause unevenness on the road surface. As described above, the expansion and contraction device using the conventional rubber powder and the asphalt containing rubber chips may affect the floor slab structure, and in such a case, the entire durability is impaired.

JP 2008-25320 A JP 2008-25324 A

  This invention is made | formed in view of the said point, The subject is providing the rubber concrete which exhibits the literal stretch property, ie, the deformability, and the restoring property suitable for the expansion device for road bridges. Another object of the present invention is that the rubber concrete does not make a step between adjacent floor slabs, does not give an impact to the vehicle, and is extremely durable compared to a conventional expansion device mainly made of asphalt. It is providing the expansion-contraction method and apparatus using the rubber concrete for road bridges which can improve property. Moreover, the other subject of this invention is providing the expansion-contraction apparatus which exhibits favorable water stop, without affecting a floor slab structure.

In order to solve the above-mentioned problems, the present invention is composed of a low-hardness rubber material and an aggregate hardened at room temperature as rubber concrete for road bridges, and the rubber hardness after hardening of the low-hardness rubber material. Is in a range of Hs = 5 to 50 degrees.
According to the present invention, it is desirable that the low-hardness rubber material has a rubber hardness after curing in the range of Hs = 5 to 50 degrees. If the rubber hardness is less than 5 degrees, the strength is insufficient and exceeds 50 degrees. The problem that mixing becomes difficult. More desirable rubber hardness is in the range of Hs = 5 to 35 degrees, and if it is within this range, the stretchability is not insufficient in the cold season, and the stretchability is not excessive in the hot season.

  The term “rubber concrete” is a coined word in the present invention, which means rubber elasticity, strength suitable for road paving, and durability such as concrete. That is, in the present invention, a vulcanized material (curing agent) is mixed with an unvulcanized rubber (room temperature vulcanization), and a fixing force to the aggregate and the like is obtained by a so-called vulcanization adhesive action. Further, rubber concrete is configured by fixing an aggregate using a low-hardness rubber material as an adhesive, and is used for construction at a construction site like concrete.

  In the construction of the rubber concrete, the low hardness rubber material may be composed of a rubber latex for natural rubber, and a synthetic rubber composed of a main agent composed of a butadiene-based material and a curing agent used in combination therewith. Desirably, these become rubber elastic bodies that are extremely flexible after being cured, and thus give good results as rubber concrete for road bridges according to the present invention. The term “curing agent” is used in the present invention to mean a vulcanized material (curing agent). Since it is clear that natural rubber may be used in the rubber concrete of the present invention, a vulcanizing agent is used as a curing agent for natural rubber. The mixing ratio of the low hardness rubber material and the aggregate is desirably in the range of 10 to 40% low hardness rubber material and 90 to 60% aggregate in mass ratio. If the hardness of the low-hardness rubber material is less than 10%, both the extensibility and the contractibility are insufficient, and if it exceeds 40%, both the extensibility and the contractility are excessive. Therefore, the rubber material can be applied to the present invention within the above range. it can.

  Furthermore, the present invention is composed of a low-hardness rubber material and an aggregate that are cured at room temperature, and the rubber hardness after curing of the low-hardness rubber material is in the range of Hs = 5 to 50 degrees, The hardness rubber material is composed of a main agent composed of a butadiene-based material and a curing agent used in combination with the main material, and the mixing ratio of the low hardness rubber material and the aggregate is 10 to 40% of the low hardness rubber material and the aggregate 90 to 60 in mass ratio. The invention of the construction method using the rubber concrete for road bridges in the range of% is included. This road concrete rubber concrete construction method has a temperature of 30 to 60 ° C. on the surface of the rubber concrete for road bridges constructed under normal outside temperature in order to promote the hardening of the rubber concrete for road bridges. In the range of 2 to 3 hours. In addition, although 25 degreeC is assumed for normal outside temperature, if it is the range of +/- 13 degreeC, there is no problem. However, it is possible to ensure the pot life by heating the material even when the temperature is lower than 12 ° C., and when the temperature exceeds 38 ° C., avoiding direct sunlight with a tent or the like.

  When heating the surface of the concrete already applied, it takes 6-12 hours to cure to the specified hardness when the temperature is less than 30 ° C under the standard condition of 25 ° C outside temperature. As the working time, it is not allowed to cure for 3 hours or more, so the lower limit is 30 ° C. On the other hand, the upper surface temperature of the road in midsummer is 60 ° C, and the upper limit of soldering used for heating equipment is 70 ° C. The temperature range is appropriate. When the heating time is less than 2 hours, the effect is insufficient and the softness still remains, and when the heating time exceeds 3 hours, the curing proceeds and becomes saturated, so the time in the above range is appropriate. In addition, as a construction method of the road concrete rubber concrete of this invention, processes other than the said heating can be implemented by normal temperature construction. In the conventional so-called elastic concrete, it is necessary to always maintain the heating temperature at 193 to 204 ° C., whereas the rubber concrete according to the present invention is not necessary.

  Further, the present invention relates to a telescopic device applied to a joint portion between floor slabs constituting a road bridge, and a space between the surface of the adjacent floor slab and the side surface of the pavement constructed on the floor slab. And a rubber having a low hardness rubber material and an aggregate cured at room temperature, and having a rubber hardness after curing of the low hardness rubber material in a range of Hs = 5 to 50 degrees. The technical scope also includes an invention of an expansion / contraction device configured to have a bonding means for bonding concrete and rubber concrete contacting the floor slab and the pavement.

  The expansion and contraction device according to the present invention is filled in a space between the surface of the adjacent floor slab and the surface of the side surface of the pavement constructed on the floor slab. Therefore, a space is formed in the joint portion between the floor slabs constituting the road bridge, and construction is performed in this space using a low-hardness rubber material and an aggregate that are cured at room temperature. The rubber hardness after curing of the low-hardness rubber material used in the above construction is rubber concrete in a range of Hs = 5 to 50 degrees, and can constitute a desirable paved road surface.

  The floor slab and the rubber concrete in contact with the pavement are bonded by an adhesive means. As the bonding means, materials having affinity for rubber concrete and asphalt pavement and floor slab made of rubber concrete and concrete can be used. However, it is desirable to use a low-hardness rubber material that constitutes rubber concrete and a special primer as a bonding means. By using this, the boundary peeling between rubber concrete and asphalt pavement and concrete is almost eliminated. In addition, there is an advantage that the durability is remarkably increased and the water stoppage on the bonded surface is improved.

  In the expansion and contraction device according to the present invention, when the thickness of the rubber concrete is larger than the pavement thickness, the rubber concrete is formed as an integral body having a size over the adjacent floor slab, and both ends of the rubber concrete are The structure which shall be fixed using the reinforcing bar fixed to the adjacent floor slab can be taken.

  Further, in the expansion and contraction device according to the present invention, when the thickness of the rubber concrete is within the pavement thickness, a gap is provided at the fixed end portion of the adjacent floor slab, and the floor slab adjacent to the gap is provided. It is possible to take a construction in which rubber concrete is constructed on both sides of the steel. Further, when the thickness of the rubber concrete is within the pavement thickness, there is a gap at the fixed end portion of the adjacent floor slab, and the rubber concrete is spread over both sides of the floor slab adjacent to the gap. The rubber concrete is constructed, and a groove-like portion is formed from the upper part of the rubber concrete toward the lower gap, and the groove-like part can be filled with a sealing material. is there.

  Furthermore, in the expansion / contraction apparatus according to the present invention, the expansion plate according to the present invention includes a floor plate that supports a load applied to the play portion between the floor slabs, and the floor plate has flexibility that can be expanded and contracted according to the load, and is a portion that is located in the play portion It can take the structure which consists of a thin steel plate or a wire mesh formed so that it may have a concave cross-sectional shape. When a ring load or the like is applied to the free space between the floor slabs, the floorboard itself can be easily expanded and contracted by elastic deformation so that the apparatus is not destroyed.

  Since this invention is comprised as mentioned above and acts, there exists an effect that the rubber concrete which exhibits the literal stretchability and durability suitable for the expansion device for road bridges can be provided. Further, according to the present invention, there is no step between adjacent floor slabs due to the expansion and contraction of rubber concrete, and since there is no impact on the vehicle, it is compared with a conventional expansion device using asphalt as an adhesive for aggregates. Thus, it is possible to provide a telescopic device using rubber concrete for road bridges with significantly improved durability. Moreover, according to the expansion-contraction apparatus which concerns on this invention, since sufficient intensity | strength by rubber concrete is obtained, it does not need to exert a bad influence on a floor slab structure, and can show favorable water stop.

Hereinafter, the present invention will be described in more detail with reference to embodiments.
<About rubber concrete for road bridges>
The rubber concrete according to the present invention is composed of a low-hardness rubber material and an aggregate that are cured at room temperature. Among them, as a low-hardness rubber material for synthetic rubber, a material composed of a main component composed of polybutadiene and a curing agent used in combination with this is used. Further, as described above, rubber latex can be used as a low-hardness rubber material for natural rubber, and the material to be used can be arbitrarily selected according to specific conditions such as construction purposes. In addition, a coarse aggregate, a fine aggregate, etc. are used for an aggregate. The coarse aggregate used had a particle size of 2.5 to 25 mm, and the fine aggregate had a particle size of about 0.075 to 2.5 mm.

上記表１は全量に対する低硬度ゴム材の配合比である１０〜４０％の範囲の下限に近いものであり、その性状は攪拌困難に近い傾向を示し、この場合のゴム硬度はおおよそＨｓ＝１５〜２０度であった。 Example 1 Next, Example 1 of the blending ratio of rubber concrete for road bridges according to the present invention is shown.
Table 1

Table 1 above is close to the lower limit of the range of 10 to 40%, which is the blending ratio of the low-hardness rubber material with respect to the total amount, and its properties tend to be almost difficult to stir. In this case, the rubber hardness is approximately Hs = 15. It was -20 degrees.

上記表２は全量に対する低硬度ゴム材の配合比である１０〜４０％の範囲の上限に近いものであり、その性状はほぼドロドロの傾向を示し、この場合のゴム硬度はおおよそＨｓ＝２０〜３０度であった。 Example 2: Example 2 of the blending ratio of rubber concrete for road bridges according to the present invention is also shown.
Table 2

Table 2 above is close to the upper limit of the range of 10 to 40%, which is the blending ratio of the low-hardness rubber material with respect to the total amount, and its properties show a tendency to become muddy, and the rubber hardness in this case is approximately Hs = 20 to It was 30 degrees.

硬化剤の製品規格は表４の通りである。
表４

* As the low-hardness rubber material, a main agent and a curing agent ("Sky Seal" F-1: trade name) made of polybutadiene were used. The product specifications of the main agent are as shown in Table 3 below.
Table 3

Table 4 shows the product specifications of the curing agent.
Table 4

The above-mentioned rubber concrete for road bridge according to the present invention is processed by a method described later, and is applied to a joint portion between floor slabs constituting the road bridge. At that time, a primer is applied to the surface of the joint portion between the floor slabs constituting the road bridge so as to firmly adhere to the rubber concrete for the road bridge. Primer U (trade name) was used as a primer. The standard is shown in Table 5.
Table 5

Method of mixing rubber concrete M1. Pretreatment of low-hardness rubber material 1) The main agent (heated when the temperature is 20 ° C. or lower) is homogenized by stirring.
2) Add a curing agent and homogenize by stirring.
M2. Mixing process of materials 1) Fine sand, fine aggregate and coarse aggregate are mixed using a mixer and homogenized by stirring.
2) A low-hardness rubber material is put into the aggregate in the mixer mixed in 1) and mixed and stirred for a required time.
M3. Filling material M2. The rubber concrete according to the present invention mixed and stirred in the above is filled in the voids of the joints between the floor slabs constituting the road bridge. Implemented in).

Below, the construction method of this invention performed using said rubber concrete for road bridges is demonstrated.
<Construction method of rubber concrete for road bridge>
A telescopic device is constructed on the floor slab using the above rubber concrete for road bridges. This construction method can be performed according to the procedure of construction on site. Since the above site construction procedure is a known construction method, description is omitted here, but in the present invention, in addition to the known construction method, in order to promote the hardening of the constructed rubber concrete for road bridges, In addition, the following methods are taken.
First, the surface of the rubber concrete for road bridges covered was covered with a sheet called a soundproof sheet (at this time, the temperature outside the cover (outside temperature, the surface of the cover) was 25 ° C.).
Next, the soundproof sheet was turned over, and the rubber concrete inside was heated at 43 ° C. using a heater. The target compressive strength was 7.3 N / mm ^{2 in} 3 hours (measured by a Schmitt lock hammer KS type). Reached. Moreover, when the temperature was changed to 53 ° C. and the same heating was performed, the compression strength reached 8.4 N / mm ² (measured value by Schmidlock Hammer KS type) in 2 hours and 45 minutes.

Furthermore, the expansion / contraction apparatus using the above-mentioned rubber concrete for road bridge will be described.
<Expansion device using rubber concrete for road bridges>
An embodiment of a telescopic device using the rubber concrete for road bridge according to the present invention will be described with reference to the drawings. FIG. 1 shows a telescopic device 10 of Example 1 according to the present invention, 11 and 12 are adjacent floor slabs, 13 and 14 are pavements constructed on the upper layers, 15 and 16 are bar anchors, 17 , 18 is a through line, and M is rubber concrete according to the present invention. The rubber concrete M fills a space surrounded by the surfaces 11a and 12a of the adjacent floor slabs 11 and 12 and the surfaces 13a and 14a of the side surfaces of the pavements 13 and 14 constructed on the floor slabs. The above-mentioned void and the rubber concrete of the present invention have the same shape and the same volume.

  In the case where the thickness of the rubber concrete M of the expansion / contraction device 10 is substantially equal to the pavement thickness, the expansion / contraction device 10 of Example 1 is an integral object having a size that spans the floor slabs 11 and 12 adjacent to each other. The rubber concrete M has a structure in which both ends of the rubber concrete M are fixed by using reinforcing bar anchors 15 and 16 and through bars 17 and 18 which are reinforcing bars fixed to the adjacent floor slabs 11 and 12. doing. Reference numeral 19 denotes a laying plate that covers the gap S between the floor slabs, and bitumen sheets 19a are provided on the upper and lower surfaces thereof to absorb expansion and contraction of the floor slabs 11 and 12 and to prevent water leakage.

  As for the construction method, the through bars 17 and 18 are attached to the insertion bar anchors 15 and 16, and the surface 11a and 12a of the floor slabs 11 and 12 and the pavement constructed on the floor slab prior to the filling of the rubber concrete M. The primers shown in Table 5 are applied to the surfaces 13a and 14a of the 13 and 14, respectively. The space between the surfaces 11a and 12a of the floor slabs 11 and 12 thus prepared and the surfaces 13a and 14a of the pavements 13 and 14 constructed on the floor slabs was mixed in the M2. Fill with rubber concrete M (M3). The filling of the rubber concrete M is performed at room temperature and can be performed using a normal tool. Therefore, large machines such as a heat melting machine, a daruma mixer, and a rolling roller, which are required in the conventional expansion and contraction device, are not necessary.

  In the expansion / contraction apparatus 10 of Example 1 configured as described above, the floor slabs 11 and 12 and the rubber concrete M are fixed by the bars 17 and 18 so that the adhesion surface does not peel off. As a result, when an external force is applied, it expands, but when the external force is removed, it contracts, no step is formed between adjacent floor slabs, and no impact is applied to the vehicle. At the same time, since the adhesive surface does not peel off, good results can be obtained with respect to water-stopping.

  FIG. 2 shows an expansion / contraction device 10 'according to a modification of Example 1 according to the present invention, which is the same as that of Example 1 except that the rubber concrete M is thicker than the pavement. Accordingly, the rubber concrete M is formed as an integral part of the size of the adjacent floor slabs 11 and 12, and both ends of the rubber concrete M are reinforcing bars fixed to the adjacent floor slabs 11 and 12. It has a fixed structure using a certain thread 17, 18. 19 is a laying board that covers the gap S between the floor slabs, and a bitumen sheet 19a is provided on the upper and lower surfaces thereof to absorb expansion and contraction of the floor slabs 11 and 12 and to prevent water leakage as in Example 1. is there. Therefore, the code | symbol regarding a common structure is used and detailed description is not repeated.

  In the telescopic device 10 'which is a modification of Example 1, the thickness of the floor slabs 11 and 12 in the gap S is reduced by making the thickness of the rubber concrete M larger than the pavement thickness. Since the strength of M is large, it is possible to satisfy the conditions necessary for vehicle traffic only by the strength. That is, the so-called jaw thickness H ′ of the floor slabs 11 and 12 can be maintained sufficiently and can prevent the jaw from being chipped (broken).

  Furthermore, the expansion-contraction apparatus 20 of Example 2 which concerns on this invention with FIG. 3 is shown. Reference numerals 21 and 22 denote adjacent floor slabs, and reference numerals 23 and 24 denote pavements constructed on respective upper layers. Reference numeral 25 denotes a backup material interposed between the adjacent floor slabs 21 and 22, and 26 denotes a sealing material. In a notch groove formed from the upper side toward the lower gap S at the center of the rubber concrete M. The rubber concrete M is connected at the lower part. The rubber concrete M, M is once constructed as a whole, and then formed by cutting using a cutter or the like (sometimes commonly referred to as a cutting joint). Thereafter, the formed groove is filled with the sealing material 26. The rubber concrete M fills the space surrounded by the surfaces 21a, 22a of the adjacent floor slabs 21, 22 and the surfaces 23a, 24a of the side surfaces of the pavements 23, 24 constructed on the floor slabs. The above-mentioned void and the rubber concrete of the present invention are also substantially the same shape, and have a slightly smaller volume corresponding to the groove.

  The expansion device 20 of Example 2 is a case where the thickness of the rubber concrete M is within the pavement thickness, the fixed end portions of the adjacent floor slabs 21 and 22 are cut to form a gap S, and the floor adjacent to the gap is provided. It corresponds to an apparatus having a structure in which rubber concrete is constructed on a plate. As a construction method, the backup material 25 and the sealing material 26 are arranged in a required position in advance, and the surfaces 21a and 22a of the floor slabs 21 and 22 and the surfaces 23a of the pavements 23 and 24 constructed on the floor slabs, 24 is coated with the primer shown in Table 5. In Example 2 having such a configuration, an elastic action by the rubber concrete M can be obtained, and a slight amount of rotational movement can be achieved by the backup material 25 and the sealing material 26 described above.

  FIGS. 4-6 shows the expansion-contraction apparatus 30 of Example 3 which concerns on this invention, 31 and 32 are the adjacent floor slabs, 33 and 34 are the pavements constructed in each upper layer, 35 and 36 are two or more. The piercing bar anchors 37 and 38 are a plurality of through bars, 39 and 41 are steel joints, and 40 is a sealing means. Anchors 39a and 41a are provided on the steel joints 39 and 41 (see FIG. 5).

  The sealing means 40 is a molded article, and FIG. 6 shows a cross section thereof. Therefore, the sealing means having the concave cross section extends in the transverse direction of the road. 6A includes a pair of side plates 40l and 40r and a rubber seal member 40m attached to the both side plates. As the sealing means 40-2 in FIG. 6B, there are a hollow structure main body 42 made of an elastic material suitable for the installation space, and deformable ribs 42a, 42b, 42c provided at three locations in the upper, middle, and lower portions of the hollow interior. This can also be used. These sealing means 40-1 and 40-2 are installed between the pavements 33 and 34 located above the floor slab space S. On the other hand, the rubber concrete M seals the sealing means so as to fill the voids between the surfaces 31a, 32a of the adjacent floor slabs 31, 32 and the surfaces 33a, 34a of the pavements 33, 34 constructed on the floor slabs. It is installed on both sides of 40-1 and 40-2.

  Furthermore, in the expansion-contraction apparatus 44 of Example 4 which concerns on this invention, it has the flexibility which can be expanded-contracted according to the said load as the baseplate 42 which supports the load concerning the loose part S between floor slabs, and in the said idle part S The structure which consists of a thin steel plate or a wire mesh formed so that it may have the concave cross-sectional shape 43 in the located part is applicable. In addition, it is the same as that of the said Example 1 etc. to provide the bitumen sheet | seat 42a on the upper and lower surfaces of the base plate 42 which consists of the said thin steel plate or a wire mesh. Further, since the other configuration is the same as the configuration so far, the reference numeral of Example 1 is used, and the detailed description is omitted (see FIG. 7).

  Conventionally, a steel plate having a thickness of about 6 mm has been used for the floor plate. However, when a wheel load is repeatedly applied to such a thick plate due to reasons such as that the steel plate and the floor slab are not smooth, the reaction force is applied to the surroundings. And the telescopic device will be destroyed in a relatively short period of time. Therefore, in Example 4 of the present invention, when a ring load or the like is applied to the free space S between the floor slabs, the floor plate 42 that easily expands and contracts due to elastic deformation is designed so as not to destroy the entire apparatus.

  As described above, the present invention is composed of a low-hardness rubber material and an aggregate that are cured at room temperature, and the rubber hardness after curing of the low-hardness rubber material is in the range of Hs = 5 to 50 degrees. In particular, the present invention is characterized by finding rubber concrete for road bridges that can be freely expanded and contracted. Since it is rubber concrete for road bridges that can be freely stretched and shrunk, it is stretched by external force, that is, shrinkage of the floor slab, and it is shrunk by external force, that is, stretching of the floor slab. In short, slight displacement (such as micro vibrations) in a short cycle is also suitably absorbed, so that wrinkles, swelling of adjacent portions, boundary peeling, and the like hardly occur, and the durability of the expansion device is remarkably improved. That is, according to the rubber concrete according to the present invention and the expansion device using the rubber concrete, even if the thickness of the rubber concrete is thin, it is elastic, has a large adhesive force, and exhibits the required strength. In road bridge applications, excellent properties such as water-stopping, vibration prevention and ultra-low noise can be obtained.

It is sectional explanatory drawing which shows Example 1 of the expansion-contraction apparatus using the rubber concrete for road bridges which concerns on this invention. It is a section explanatory view showing the modification of the expansion and contraction device of example 1 similarly. It is sectional explanatory drawing which similarly shows Example 2 of an expansion-contraction apparatus. It is sectional explanatory drawing which similarly shows Example 3 of an expansion-contraction apparatus. It is a top view which shows an example of the steel joints same as the above. It is sectional drawing which shows A and B two examples of the sealing means in the same as the above. It is sectional explanatory drawing which similarly shows Example 4 of an expansion-contraction apparatus. It is a partial front view which shows the road bridge to which the expansion device for road bridges is applied. It is explanatory drawing which shows the edge part process called a steel joint etc. which similarly used the corrugated formwork.

10, 20, 30, 44 Telescopic device 11, 12, 21, 22, 31, 32 Floor slab 13, 14, 23, 24, 33, 34 Pavement 15, 16, 35, 36 Reinforcing bar anchor 17, 18, 37, 38 Reinforcing bars 19, 42 Base plate 25 Backup material 26 Sealing material 39, 41 Steel joint 40 Sealing means 43 Concave cross-sectional shape H Jaw thickness M Rubber concrete S Yuma

Claims (8)

For road bridges, characterized by comprising a low-hardness rubber material and an aggregate hardened at room temperature, and the rubber hardness after curing of the low-hardness rubber material is in the range of Hs = 5 to 50 degrees Rubber concrete. The low-hardness rubber material is composed of a main agent composed of a butadiene-based material and a curing agent used in combination with this.
2. The rubber concrete for road bridge according to claim 1, wherein the mixing ratio of the low hardness rubber material and the aggregate is in the range of 10 to 40% low hardness rubber material and 90 to 60% aggregate in mass ratio. It is composed of a low-hardness rubber material and an aggregate that are cured at room temperature, and the rubber hardness after curing of the low-hardness rubber material is in the range of Hs = 5 to 50 degrees, and the low-hardness rubber material is butadiene It is composed of a main agent composed of a system material and a curing agent used in combination with this, and the mixing ratio of the low hardness rubber material and the aggregate is in the range of 10 to 40% low hardness rubber material and 90 to 60% aggregate in mass ratio. A construction method using rubber concrete for road bridges,
In order to accelerate the hardening of the rubber concrete for road bridges, the surface of the rubber concrete for road bridges constructed under a normal outside temperature is heated for 2 to 3 hours at a temperature of 30 to 60 ° C. The construction method of the rubber concrete for road bridges characterized by doing. An expansion and contraction device applied to a joint portion between floor slabs constituting a road bridge,
A space between the surface of the adjacent floor slab and the side surface of the pavement constructed on the floor slab,
Rubber concrete constructed using the low-hardness rubber material and aggregate cured at room temperature, and having a rubber hardness after curing of the low-hardness rubber material in the range of Hs = 5 to 50 degrees. ,
An expansion and contraction device using rubber concrete for road bridges having an adhesive means for adhering rubber concrete in contact with the floor slab and pavement. When the thickness of the rubber concrete is within the pavement thickness,
5. The rubber for road bridges according to claim 4, wherein a gap is provided at a fixed end portion of the adjacent floor slab, and rubber concrete is constructed on both sides of the floor slab adjacent to the gap. Telescopic device using concrete. When the thickness of the rubber concrete is within the pavement thickness,
There is a gap in the fixed end of the adjacent floor slab, and rubber concrete is constructed on both sides of the floor slab adjacent to the gap. 5. A telescopic device using rubber concrete for road bridges according to claim 4, wherein a groove-shaped portion is formed toward the gap between the first and second slots, and the groove-shaped portion is filled with a sealing material. When the thickness of rubber concrete is larger than the pavement thickness,
The rubber concrete is formed as an integral part of a size that spans the adjacent floor slab,
The expansion / contraction apparatus using the rubber concrete for road bridges of Claim 4 which has the structure fixed using the reinforcing bar fixed to the adjacent floor slab. An expansion and contraction device applied to a joint portion between floor slabs constituting a road bridge,
A floor plate that supports a load related to the gap portion between floor slabs is provided, and the floor plate has flexibility that can be expanded and contracted according to the load, and has a concave cross-sectional shape at a portion located in the gap portion. The expansion-contraction apparatus using the rubber concrete for road bridges of Claim 4 which consists of the formed thin steel plate or wire mesh.

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