JP7680232B2 - Bridge expansion device and its manufacturing method - Google Patents

Description

The present invention relates to a bridge expansion device that is installed at the joints of bridge structures and a method for manufacturing the same.

In bridges such as road bridges, a superstructure with a deck and bridge girders is suspended over a substructure such as a pier or abutment, and is connected to the road at the end of the bridge. In order to absorb movements caused by deflection of the deck due to traffic load and expansion and contraction due to temperature changes, bridge expansion devices (see, for example, Patent Document 1) are installed at the joints between the deck and road and between decks themselves in the superstructure of such bridges. The bridge expansion device disclosed in Patent Document 1 has a pair of supports that are connected to the deck or road and spaced apart at a predetermined distance, and a rubber sealant that is bonded to be installed between the two supports, and allows the deck or road to expand and contract through the gap (gap) between the pair of supports, while the rubber sealant prevents rainwater, sand, and gravel from falling through the gap.

Patent No. 4601689

In the bridge expansion device disclosed in Patent Document 1, the rubber sealant is exposed to the road surface, and as a result, deterioration such as hardening and molecular chain scission caused by exposure to ultraviolet rays and ozone, wear due to contact with vehicle tires, and deterioration caused by the load of the vehicle applied through the sand and gravel accumulated on the surface can cause tears and cracks in the rubber sealant over time, reducing its sealing ability, making it impossible to prevent rainwater, sand, and gravel from falling through the gaps, and causing adverse effects such as corrosion and deterioration of structures below the rubber sealant.

In other words, the objective of the present invention is to provide a bridge expansion device with excellent sealing properties and a manufacturing method thereof.

In order to overcome the problems and achieve the intended object, the first invention of the present application provides:
A bridge expansion device that connects opposing bridge structures,
Supports are positioned at a predetermined distance from each other and fixed to correspond to each of the bridge structures;
a first rubber seal member provided to connect the support portions and to seal the gap between the support portions with a first seal portion;
The gist of the invention is that it comprises a second rubber sealant that is provided at a position spaced below the first seal portion of the first rubber sealant so as to connect the support portions and seal the gap between the support portions with the second seal portion.
In this way, since the second rubber sealant is provided below the first rubber sealant, the second rubber sealant is less likely to be exposed to ultraviolet rays or ozone, and deterioration such as hardening or molecular chain scission can be suppressed, and since the load of the vehicle is not applied to the second rubber sealant through contact with tires or sand and gravel, the sealing performance of the second rubber sealant can be maintained for a long period of time. In other words, the sealing performance of the bridge expansion joint is improved, and it is possible to prevent rainwater, sand and gravel from falling through the gap (gap) and causing adverse effects on the structure below.

The second invention is
The gist of the present invention is that the bonding strength between the first rubber sealant and the supporting portion is greater than the bonding strength between the second rubber sealant and the supporting portion and/or the first rubber sealant.
In this way, by making the bonding strength of the first rubber sealant exposed to the road surface greater than that of the second rubber sealant not exposed to the road surface, it is possible to improve the sealing performance without impairing the function of the bridge expansion device. Also, by reducing the bonding strength of the second rubber sealant not exposed to the road surface, it is possible to simplify the installation work of the second rubber sealant.

The third invention is
The second rubber sealant has a leg portion connected to an end of the second seal portion and facing the support portion, the leg portion being joined to the support portion and/or the first rubber sealant,
The present invention is characterized in that a non-jointed portion is provided on the leg portion of the second rubber seal material at an end portion connected to the second seal portion.
In this way, by providing a non-jointed portion in the second rubber sealing material, the second rubber sealing material is allowed to elastically deform over a wide range when the gap expands, and the load on the support portion and the joint with the first rubber sealing material is reduced, preventing damage, etc.

In order to overcome the problems and achieve the intended object, the fourth invention of the present application is:
A method for manufacturing a bridge expansion device that connects opposing bridge structures, comprising the steps of:
A first rubber seal is fixed so as to connect the support parts arranged at a predetermined distance from each other, and the gap between the support parts is sealed with a first seal part of the first rubber seal,
The gist of the invention is that a second rubber sealing material is fixed to a position spaced below the first sealing portion of the first rubber sealing material so as to connect the support portions, and the gap between the support portions is sealed by the second sealing portion of the second rubber sealing material.
In this way, since the first rubber sealing material has a first folded portion that is elastically deformable, the work of installing the second rubber sealing material can be easily performed by elastically deforming the first folded portion to widen the gap between the pair of support portions.

The fifth invention is
The gist of the present invention is that the second rubber sealing material is joined to the supporting portion and/or the first rubber sealing material so that the bonding strength between the first rubber sealing material and the supporting portion is greater than the bonding strength between the second rubber sealing material and the supporting portion and/or the first rubber sealing material.
In this way, by making the bonding strength of the first rubber sealant exposed to the road surface greater than that of the second rubber sealant not exposed to the road surface, it is possible to improve the sealing performance without impairing the function of the bridge expansion device. Also, by reducing the bonding strength of the second rubber sealant not exposed to the road surface, it is possible to simplify the installation work of the second rubber sealant.

The sixth invention is
The gist of the invention is that a non-jointed portion is provided on the connected end between the leg portion facing the support portion in the second rubber sealing material and the second sealing portion, and the leg portion is joined to the support portion and/or the first rubber sealing material.
In this way, by providing a non-jointed portion in the second rubber sealing material, the second rubber sealing material is allowed to elastically deform over a wide range when the gap expands, and the load on the joint with the support part and the first leg part is reduced, preventing damage, etc.

The present invention can improve the sealing performance of bridge expansion joints.

1 is a schematic plan view showing a bridge expansion device according to an embodiment of the present invention. 2 is a cross-sectional view taken along line AA in FIG. 1, in which (a) shows the state before the gap (gap) is expanded, and (b) shows the state after the gap (gap) is expanded. 1 is a table evaluating the adhesives of the examples and comparative examples. FIG. 4 is an explanatory diagram showing a manufacturing process of the bridge expansion device according to the embodiment. FIG. 2 is a schematic vertical cross-sectional view showing a bridge expansion device according to a first alternative embodiment. FIG. 11 is a schematic vertical cross-sectional view showing a bridge expansion device according to a second alternative embodiment.

Next, a preferred embodiment of the bridge expansion device and its manufacturing method according to the present invention will be described below with reference to the attached drawings.

The bridge expansion device 10 of the embodiment is a device installed at the joint between decks or between a deck and a road, which are bridge structures that constitute a bridge. As shown in Figures 1 and 2, this bridge expansion device 10 is equipped with a pair of joint members 12, 12 arranged facing each other with a predetermined distance between them, a first rubber seal material 16 provided in the gap (hereinafter referred to as the gap) 14 between the joint members 12, 12, and a second rubber seal material 18 provided at a position spaced below the first seal portion 16b of the first rubber seal material 16 in the gap 14. This joint member 12 is equipped with a plate-shaped support portion 20, a bottom plate 22 provided at the lower end of the support portion 20 and extending away from the other joint member 12, and a different diameter reinforcing bar 24 provided on the outer surface of the support portion 20 and extending away from the other joint member 12. Then, with the support parts 20 of the pair of joint members 12 facing each other with a space between them, the bottom plate 22 and the different diameter reinforcing bars 24 are fixed to the deck or road, which is a bridge structure. In this way, the bridge expansion device 10 is installed at the joint part so that the pair of joint members 12, 12 are separated in the direction of vehicle traffic, and the first rubber seal material 16 and the second rubber seal material 18 located above and below are designed to prevent rainwater, sand, and stones from falling through the gap 14. The support part 20 is formed in a plate shape with its short side extending in the vertical direction and its long side extending in the road width direction intersecting with the traffic direction. In this embodiment, the recessed and protruding parts are formed so as to be repeated in the longitudinal direction, but it may be bent or flat. The support part 20, the bottom plate 22, and the different diameter reinforcing bars 24 are all made of steel, and general structural steel (SS400) is preferably used for the support part 20.

The first rubber seal 16 is made of, for example, chloroprene rubber (CR) and is vulcanized and bonded to a pair of support parts 20, 20. As shown in FIG. 2, the first legs 16a, 16a extend vertically along each support part 20, and the first seal part 16b is connected between the upper ends of the first legs 16a, 16a and is folded back downward in an approximately U-shape and hangs down. The outer surfaces of the first legs 16a, 16a are vulcanized and bonded to the inner surfaces of each support part 20, and the first seal part 16b faces between the pair of support parts 20, 20. In other words, the first legs 16a, 16a are connected to the ends of the support parts 20, 20 in the direction of separation of the first seal part 16b so as to face each other, and the ends of the support parts 20, 20 on the road surface side are connected by the first rubber seal 16 to close the gap 14. The first rubber seal 16 is provided over the entire length of the support parts 20, 20 in the longitudinal direction, and fills the gap 14 between the pair of support parts 20, 20 over the entire length in the longitudinal direction, and is configured so that when the gap 14 expands or contracts, the first seal part 16b elastically deforms to follow the movement of the support parts 20, 20. The first rubber seal 16 is also provided with stoppers 16c that protrude inward below the lower end of the first seal part 16b in each first leg part 16a, and is configured so that the second rubber seal 18 can be positioned by the stoppers 16c, 16c during the bonding operation of the second rubber seal 18 described later (see FIG. 4(d)).

The second rubber seal 18 is made of, for example, chloroprene rubber and is bonded to a pair of support parts 20, 20 with an adhesive 26, and is formed in approximately the same shape as the first rubber seal 16. That is, as shown in FIG. 2, the second rubber seal 18 is composed of second leg parts 18a, 18a extending in the vertical direction along each support part 20, and a second seal part 18b connected between the upper ends of both second leg parts 18a, 18a and hanging down in an approximately U-shape, and the outer surfaces of both second leg parts 18a, 18a are bonded to the inner surfaces of each support part 20 with an adhesive 26, and the second seal part 18b faces between the pair of support parts 20, 20. That is, the second legs 18a, 18a are connected to the ends of the second seal portion 18b in the direction of separation of the support portions 20, 20 so as to face each other, and the second rubber seal material 18 connects the position of the first rubber seal material 16 that is spaced downward from the first seal portion 16b, thereby closing the gap 14. The second rubber seal material 18 is also provided over the entire length of the support portions 20, 20 in the longitudinal direction, and closes the gap 14 between the pair of support portions 20, 20 over the entire length in the longitudinal direction, and is configured so that when the gap 14 expands and contracts, the second seal portion 18b elastically deforms to follow the movement of the support portions 20, 20.

The second rubber seal 18 has a non-jointed portion 28 that is not joined to the first rubber seal 16 and the support portion 20 at the end of the second leg 18a connected to the second seal portion 18b. Specifically, the second rubber seal 18 of the embodiment has a non-jointed portion 28 that overlaps the inside of the first leg 16a of the first rubber seal 16 and is not bonded to the first leg 16a above the joint portion of each second leg 18a with the support portion 20, and is configured so that when the gap 14 expands, the second leg portions 18a, 18a of the second rubber seal 18 can elastically deform at the non-jointed portion 28, 28. Note that rubber other than chloroprene rubber can be used as the material for the first rubber seal 16 and the second rubber seal 18 as long as it is not porous and does not allow rainwater to penetrate.

Here, we will explain the results of evaluating the types of adhesive 26 used to bond the second rubber sealant 18 and the support portion 20 that are suitable for use in the bridge expansion device 10, using the examples and comparative examples shown in Figure 3.

The types and various physical properties of the examples and comparative examples are as shown in Figure 3. The example is a product manufactured by Shin-Etsu Chemical Co., Ltd. under the product name Sealant Master 300, Comparative Example 1 is a product manufactured by Momentive Performance Materials Japan LLC under the product name TSE-385, Comparative Example 2 is a product manufactured by Shin-Etsu Chemical Co., Ltd. under the product name KE-4920-T, and Comparative Example 3 is a product manufactured by Shin-Etsu Chemical Co., Ltd. under the product name Sealant 70. The tensile stress and breaking elongation of the post-curing physical properties were measured in accordance with JIS K 6849.

For the examples and comparative examples, the adhesive peel strength was measured, and the peeling state when the adhesive peel strength was measured and the behavior immediately after the adhesive was applied were observed, and an overall judgment was made. For the adhesive peel strength, a 20 mm wide sample made of chloroprene rubber was prepared, and the adhesive peel strength was measured in accordance with JIS K 6854-2 (1999) for each of the following cases: when the sample was adhered to untreated steel material made of SS400 and the surface of which had not been pretreated; when the sample was adhered to chloroprene rubber; and when the sample was adhered to treated steel material made of SS400 and the surface of which had been applied with a primer and overcoat for vulcanization adhesion and then baked and dried. The behavior immediately after application was also evaluated by applying the adhesive to a vertical wall and determining whether the adhesive dripped.

The examples are one-liquid type adhesives, and the adhesive peel strengths of the untreated steel, chloroprene rubber, and treated steel were all higher than the standard adhesive peel strength value required for bridge expansion devices (50N in this example), and there was no interfacial peeling. In addition, the behavior immediately after application was evaluated as being easy to apply, with a moderate viscosity and no dripping. In other words, the adhesives of the examples were rated as having adhesive peel strength that met the standard value, had sufficient strength for use in bridge expansion devices, and were easy to work with, so were rated as "◎".

Comparative Example 1 is a one-component adhesive, and the adhesive peel strengths of untreated steel, chloroprene rubber, and treated steel were all lower than the standard values, and there was interfacial peeling. In addition, the behavior immediately after application was evaluated as low viscosity, causing dripping, and there was a risk of dripping during application, causing unevenness, and the adhesive was evaluated as having poor application workability. In other words, the adhesive of Comparative Example 1 did not meet the standard value for adhesive peel strength, was not strong enough for use in bridge expansion devices, and had poor workability, so it was rated as "X."

Comparative Example 2 is a one-component adhesive, and the adhesive peel strength with untreated steel was lower than the standard value, and the peel state was interfacial peeling. In addition, the adhesive peel strength with chloroprene rubber and treated steel broke (peeled off) during handling before measurement, and the adhesive peel strength could not be measured, but the peel state was interfacial peeling. In addition, as with Comparative Example 1, the behavior immediately after application was evaluated as low viscosity, causing dripping, and poor application workability. In other words, the adhesive of Comparative Example 2 did not meet the standard value for adhesive peel strength, was not strong enough for use in bridge expansion devices, and had poor workability, so was rated as "X."

Comparative Example 3 is a two-component adhesive, and mixing the two components is complicated, and the adhesive thickens during application, making it difficult to use. Therefore, the adhesive peel strength was not measured. In other words, the adhesive of Comparative Example 3 was judged to be "X" because of its poor workability.

From the above evaluation, as the adhesive 26 used to bond the second rubber sealant 18 and the support portion 20 in the bridge expansion device 10, a one-component type adhesive is preferable for use in the bridge expansion device 10 because it does not require the mixing of two components as with two-component adhesives, does not thicken during application, and does not drip, making it extremely easy to work with. In addition, an adhesive that has an adhesive peel strength of 50 N/20 mm or more and satisfies the condition of no interfacial peeling is also suitable in terms of strength for use in the bridge expansion device 10. Here, the first rubber sealant 16 is bonded downstream to the support portions 20, 20 as described above, and the bonding strength of the first rubber sealant 16 is higher than the bonding strength of the second rubber sealant 18.

Next, a method for manufacturing a bridge expansion device according to the embodiment will be described with reference to FIG.
In the manufacturing method of the embodiment, as shown in FIG. 4(a), the joint members 12, 12 are positioned so that the pair of support parts 20, 20 face each other at a predetermined distance, and an unvulcanized rubber raw material 17 is set in the gap 14 between the pair of support parts 20, 20. Here, in this embodiment, a chloroprene rubber raw material is used as the unvulcanized rubber raw material 17 for forming the first rubber sealant 16. Also, a conventionally known primer suitable for vulcanization bonding of chloroprene rubber is applied to the surface of the support parts 20, 20 in advance. In this state, an upper mold (mold) 30 is pressed into the gap 14 from above the gap 14 under a predetermined pressure, and a lower mold (mold) 32 is pressed into the gap 14 from above the gap 14 under a predetermined pressure, vulcanizing the unvulcanized rubber raw material 17 to vulcanize and mold the first rubber sealant 16, and vulcanizing and bonding the first leg parts 16a, 16a of the first rubber sealant 16 to the support parts 20, 20. Here, the shapes of the dies 30, 32 are set so that the shape of the gap defined between the support parts 20, 20 and the upper and lower dies 30, 32 is the same as that of the first rubber seal material 16 shown in Fig. 2. After the first rubber seal material 16 is vulcanized and molded, the upper die 30 and the lower die 32 are opened so as to be pulled out from the clearance 14, thereby obtaining a pair of joint members 12, 12 in which the first rubber seal material 16 is vulcanized and bonded between the pair of support parts 20, 20 (see Fig. 4(b)). Prior to the vulcanization molding of the first rubber seal material 16, various pretreatments such as deoiling/wiping treatment and surface treatment by sandblasting are performed on the inner surface of each support part 20 (vulcanized bonding surface of the first rubber seal material 16).

For the second rubber seal material 18, the upper and lower dies 30, 32 used in the vulcanization molding of the first rubber seal material 16 and the pair of joint members 12, 12 to which the first rubber seal material 16 has not been vulcanized are used, and unvulcanized rubber raw material is set between the gap 14 of the pair of support parts 20, 20 in the same manner as in the vulcanization molding of the first rubber seal material 16. Here, in this embodiment, chloroprene rubber raw material is used as the unvulcanized rubber raw material for forming the second rubber seal material 18, as in the first rubber seal material 16. Then, in this state, the upper die (die) 30 is pressed in from above the gap 14 under a predetermined pressure, and the lower die (die) 32 is pressed in from above the gap 14 under a predetermined pressure, and the unvulcanized rubber raw material is vulcanized to vulcanize the second rubber seal material 18. It is preferable to apply a release agent to the inner surface of the support part 20 of the joint member 12 used in vulcanization molding of the second rubber seal material 18 to prevent the second rubber seal material 18 from vulcanization bonding to the support part 20. Then, the pair of support parts 20, 20 are separated and the upper mold 30 and the lower mold 32 are opened to obtain the second rubber seal material 18 having the same shape as the first rubber seal material 16.

Prior to the bonding operation of bonding the second rubber seal material 18 to the pair of support parts 20, 20 to which the first rubber seal material 16 is vulcanization bonded, various pretreatments such as deoiling and wiping treatments and surface treatments by sandblasting are performed on the area of the support part 20 where the first leg part 16a of the first rubber seal material 16 is not vulcanization bonded (the bonding area of the second rubber seal material 18) to remove the primer used when the first rubber seal material 16 was vulcanization bonded.

Next, masking tape 36 is applied to the position of the non-jointed portion 28 provided on the connecting end side of the second leg 18a of the second rubber seal material 18 with the second seal portion 18b, and masking treatment is performed. Specifically, in this embodiment, masking tape 36 is applied to a predetermined area of the lower inner surface of the first leg 16a of the first rubber seal material 16 (the connecting side with the first seal portion 16b from the adhesive area), and an area where the first rubber seal material 16 and the second rubber seal material 18 are not bonded by the adhesive 26 is secured. Note that, as the masking tape 36, a tape made of, for example, polyethylene, to which the adhesive 26 does not adhere can be used, but tapes of other materials can be used as long as the adhesive 26 does not adhere.

Then, adhesive 26 is applied to the adhesion area of the second rubber seal material 18 in each support part 20. The process of attaching the masking tape 36 and the process of applying adhesive 26 are performed with the joint members 12, 12 to which the first rubber seal material 16 has been vulcanization-bonded turned upside down, as shown in FIG. 4(c). Note that although the pair of support parts 20, 20 are connected by the first rubber seal material 16, various processes can be easily performed in a state in which the first seal part 16b of the first rubber seal material 16 is elastically deformed to widen the gap 14 between the pair of support parts 20, 20.

A fixing jig 38 is attached between the second leg portions 18a, 18a of the vulcanized second rubber seal material 18 with double-sided tape or the like to maintain the separation between the second leg portions 18a, 18a. The second rubber seal material 18 is inserted between the pair of support portions 20, 20 from its seal portion side and positioned in a position regulated by the stoppers 16c, 16c provided on the first rubber seal material 16. At this time, since the joint members 12, 12 are upside down, the second rubber seal material 18 is positioned in a posture in which the second seal portion 18b extends from the first seal portion 16b of the first rubber seal material 16 toward the bottom side (upper side in the figure), which is the lower side when the bridge expansion device 10 is installed at the joint, as shown in Figure 4(d). Then, by reducing the gap 14 between the pair of supports 20, 20, the second leg 18a, 18a of the second rubber sealant 18 is clamped and pressed between the fixing jig 38 and the supports 20, 20, and the second leg 18a is cured until it is bonded to the support 20 by the adhesive 26. By removing the fixing jig 38 from the second rubber sealant 18 with the second leg 18a, 18a bonded to the supports 20, 20, the bridge expansion device 10 is obtained in which the first rubber sealant 16 and the second rubber sealant 18 that close the gap 14 are provided vertically spaced apart between the pair of supports 20, 20.

Next, the operation of the bridge expansion device 10 according to the embodiment will be described. In the bridge expansion device 10 according to the embodiment, the first rubber sealant 16 and the second rubber sealant 18 are provided vertically spaced apart between a pair of support parts 20, 20, so that the second rubber sealant 18, which is not exposed to the road surface, is less likely to be exposed to ultraviolet rays or ozone, and deterioration such as hardening and molecular chain scission can be suppressed. In addition, deterioration due to physical loads such as tire contact and the load of the vehicle applied through sand and gravel can be prevented, and the sealing property of the second rubber sealant 18 can be maintained for a long period of time. In other words, the sealing property of the bridge expansion device 10 is improved, and rainwater, sand and gravel, etc. can be prevented from falling from the gap 14 and causing adverse effects on the structure below. In addition, even if the first rubber sealant 16 is torn or cracked, the second rubber sealant 18 can prevent rainwater, sand, and gravel from falling through the gap 14, so the bridge expansion device 10 does not need to be replaced as often, and the labor time and costs associated with replacement can be reduced. In addition, the first rubber sealant 16 and the second rubber sealant 18 have seal portions 16b, 18b of approximately the same shape that can be elastically deformed, so that good compliance with the expansion and contraction of the gap 14 can be maintained even when the second rubber sealant 18 is added.

In the embodiment of the bridge extension device 10, the first rubber seal material 16 is vulcanized and bonded to the pair of support parts 20, 20, so that the adhesive strength between the first rubber seal material 16 and the support part 20 can be increased, and the first rubber seal material 16 can be prevented from peeling off from the support part 20. In addition, since the second rubber seal material 18 is bonded to the support part 20 with an adhesive 26, the second rubber seal material 18 can be easily bonded between the pair of support parts 20, 20 without using a vulcanizing device or the like. In this way, by vulcanizing and bonding the first rubber seal material 16 exposed to the road surface side to a higher bonding strength than the second rubber seal material 18 not exposed to the road surface side, the sealing property can be improved without impairing the function of the bridge extension device 10. In addition, since the bonding strength of the second rubber seal material 18 not exposed to the road surface side can be suppressed, the installation work of the second rubber seal material 18 can be simplified.

The second rubber seal 18 has non-bonded portions 28, 28 that overlap the first leg portions 16a, 16a of the first rubber seal 16 without being bonded. As shown in FIG. 2(b), when the gap 14 expands, not only the second seal portion 18b of the second rubber seal 18 but also the non-bonded portions 28, 28 of the second leg portions 18a, 18a of the second rubber seal 18 elastically deform. In other words, when the gap 14 expands, the second rubber seal 18 elastically deforms over a wide range, so that the joint between the second leg portions 18a, 18a and the support portions 20, 20 is prevented from being subjected to a large load in the direction of peeling the joint, and problems such as the second rubber seal 18 peeling off or being damaged from the support portions 20, 20 can be prevented.

The first rubber seal material 16 having the elastically deformable first seal portion 16b is vulcanized and bonded to the pair of support portions 20, 20, and then the second rubber seal material 18 is bonded to the support portions 20, 20. With the first seal portion 16b elastically deformed to widen the gap 14 between the support portions 20, 20, the adhesive 26 can be easily applied to the bonding area and the second rubber seal material 18 can be easily set between the pair of support portions 20, 20. In other words, the bonding work of the second rubber seal material 18 (the work of placing the second rubber seal material 18 between the pair of support portions 20, 20) is easy and the work time can be shortened, making it easy to manufacture a bridge expansion device 10 with excellent sealing properties.

Before applying the adhesive 26 to the adhesive area, the first legs 16a, 16a of the first rubber sealant 16 are masked by applying a masking tape 36. Therefore, even if the adhesive 26 overflows from the adhesive area when the second legs 18a, 18a of the second rubber sealant 18 are clamped and pressed between the fixing jig 38 and the support parts 20, 20, the legs 16a, 18a of both sealants 16, 18 are not bonded by the adhesive 26, and the non-bonded part 28 can be reliably provided. In addition, before bonding the second rubber sealant 18, the inner surface of the support parts 20, 20 to which the second legs 18a, 18a are bonded is subjected to a surface roughening treatment to form a large number of roughnesses on the inner surface, so that the adhesive area of the adhesive 26 can be increased and the adhesive strength between the second legs 18a, 18a and the support parts 20, 20 can be increased. In the embodiment, the second rubber seal material 18 is vulcanized using the same molds 30, 32 used to vulcanize the first rubber seal material 16, which reduces mold costs.

Figures 5 and 6 show a bridge expansion device according to another embodiment. The parts that differ from the embodiment are explained, and the same parts as those already mentioned are given the same reference numerals.

The bridge expansion device 40 according to the first alternative embodiment shown in FIG. 5 has the second legs 18a, 18a of the second rubber sealant 18 bonded by adhesive 26 to the inner side of the first legs 16a, 16a of the first rubber sealant 16, which is vulcanized and bonded to a pair of support parts 20, 20. As for the adhesive 26 used in the first alternative embodiment, as described above with reference to FIG. 3, by using the adhesive of the embodiment, a necessary and sufficient adhesive peel strength can be obtained. In addition, the manufacturing method is the same as the embodiment, except that the part (adhesion area) where the adhesive 26 is applied during the bonding operation of the second rubber sealant 18 is changed to the inner side of the first legs 16a of the first rubber sealant 16.

In the bridge expansion device 42 according to the second alternative embodiment shown in FIG. 6, one of the second legs 18a of the second rubber sealant 18 is directly bonded to the support portion 20 with adhesive 26, while the other of the second legs 18a of the second rubber sealant 18 is bonded to the inner surface of one of the first legs 16a of the first rubber sealant 16 with adhesive 26. For the second alternative embodiment as well, the adhesive of the embodiment shown in FIG. 3 is used to obtain a necessary and sufficient adhesive peel strength. The manufacturing method is the same as the embodiment, except that the area (adhesive area) where the adhesive 26 is applied during the bonding process of the second rubber sealant 18 is changed.

The bridge expansion devices 40, 42 according to the first and second alternative embodiments have the same effects as the embodiment.

(Example of change)
The present application is not limited to the configurations of the above-described embodiment and other embodiments, and other configurations can be appropriately adopted.
1. In the embodiment, a stopper for positioning the second rubber seal is provided on the first leg of the first rubber seal, but if a separate member is used to set the second rubber seal in the appropriate position between the pair of supports, the stopper can be omitted.
2. In the embodiment, the sealing portion of each sealing material is formed in a U-shape, but various shapes that can be elastically deformed in response to expansion and contraction of the gap, such as a V-shape or a concave shape, can be used.

14 gap (gap), 16 first rubber seal material, 16a first leg portion, 16b first seal portion, 18 second rubber seal material, 18a second leg portion, 18b second seal portion, 20 support portion, 26 adhesive, 28 non-joint portion, 30 upper die (die), 32 lower die (die)

Claims (10)

A bridge expansion device that connects opposing bridge structures,
Supports are positioned at a predetermined distance from each other and fixed to correspond to each of the bridge structures;
a first rubber seal member provided to connect the support portions and to seal the gap between the support portions with a first seal portion that is folded downward in a U-shape and hangs down ;
a second rubber sealant provided at a position spaced downward from the first seal portion of the first rubber sealant so as to connect the support portions and close the gap between the support portions with a second seal portion,
The second rubber sealant is provided with a leg portion that is connected downward to an end of the second seal portion and faces the support portion. A bridge expansion device that connects opposing bridge structures,
Supports are positioned at a predetermined distance from each other and fixed to correspond to each of the bridge structures;
a first rubber seal member provided to connect the support portions and to seal the gap between the support portions with a first seal portion that is folded downward in a U-shape and hangs down ;
a second rubber sealant provided at a position spaced downward from the first seal portion of the first rubber sealant so as to connect the support portions and close the gap between the support portions with a second seal portion,
The second rubber sealant has a leg portion connected to an end of the second seal portion and facing the support portion, the leg portion being located inside the support portion. A bridge expansion device that connects opposing bridge structures,
Supports are positioned at a predetermined distance from each other and fixed to correspond to each of the bridge structures;
a first rubber seal member provided to connect the support portions and to seal the gap between the support portions with a first seal portion;
a second rubber sealant provided at a position spaced downward from the first seal portion of the first rubber sealant so as to connect the support portions and close the gap between the support portions with a second seal portion,
The second rubber sealant has a leg portion connected to an end of the second seal portion and facing the support portion, and the leg portion is joined to the support portion and the first rubber sealant. A bridge expansion device that connects opposing bridge structures,
Supports are positioned at a predetermined distance from each other and fixed to correspond to each of the bridge structures;
a first rubber seal member provided to connect the support portions and to seal the gap between the support portions with a first seal portion;
a second rubber sealant provided at a position spaced downward from the first seal portion of the first rubber sealant so as to connect the support portions and close the gap between the support portions with a second seal portion,
the second rubber seal member includes a leg portion connected to an end of the second seal portion and facing the support portion,
The leg portion has a joint portion that is joined to the support portion and/or the first rubber sealant, and a non-joint portion that overlaps the first rubber sealant on the second seal portion side of the joint portion and is not bonded to the first rubber sealant. A bridge expansion device that connects opposing bridge structures,
Supports are positioned at a predetermined distance from each other and fixed to correspond to each of the bridge structures;
a first rubber seal member provided to connect the support portions and to seal the gap between the support portions with a first seal portion;
a second rubber sealant provided at a position spaced downward from the first seal portion of the first rubber sealant so as to connect the support portions and close the gap between the support portions with a second seal portion,
A bridge expansion device, wherein the bonding strength between the first rubber sealant and the supporting portion is greater than the bonding strength between the second rubber sealant and the supporting portion and/or the first rubber sealant. A method for manufacturing a bridge expansion device that connects opposing bridge structures, comprising the steps of:
A first rubber seal is fixed so as to connect the support parts arranged at a predetermined distance from each other, and the gap between the support parts is sealed with a first seal part of the first rubber seal,
a second rubber seal material is fixed to a position spaced downward from the first seal portion of the first rubber seal material so as to connect the support portions, and the gap between the support portions is blocked by the second seal portion of the second rubber seal material;
the second rubber seal member includes a leg portion that is connected downward to an end portion of the second seal portion and faces the support portion ,
A method for manufacturing an expansion and contraction device for a bridge , wherein the first seal portion is folded back downward in a U shape and hangs down . A method for manufacturing a bridge expansion device that connects opposing bridge structures, comprising the steps of:
A first rubber seal is fixed so as to connect the support parts arranged at a predetermined distance from each other, and the gap between the support parts is sealed with a first seal part of the first rubber seal,
a second rubber seal material is fixed to a position spaced downward from a first seal portion of the first rubber seal material so as to connect the support portions, and the gap between the support portions is blocked by a second seal portion of the second rubber seal material;
the second rubber seal member includes a leg portion connected to an end of the second seal portion and facing the support portion, the leg portion being disposed inside the support portion ;
A method for manufacturing an expansion and contraction device for a bridge , wherein the first seal portion is folded back downward in a U shape and hangs down . A method for manufacturing a bridge expansion device that connects opposing bridge structures, comprising the steps of:
A first rubber seal is fixed so as to connect the support parts arranged at a predetermined distance from each other, and the gap between the support parts is sealed with a first seal part of the first rubber seal,
a second rubber seal material is fixed to a position spaced downward from a first seal portion of the first rubber seal material so as to connect the support portions, and the gap between the support portions is blocked by a second seal portion of the second rubber seal material;
A method for manufacturing an expansion device for a bridge, in which the second rubber sealant has a leg portion connected to an end of the second seal portion and facing the support portion, and the leg portion is joined to the support portion and the first rubber sealant. A method for manufacturing a bridge expansion device that connects opposing bridge structures, comprising the steps of:
A first rubber seal is fixed so as to connect the support parts arranged at a predetermined distance from each other, and the gap between the support parts is sealed with a first seal part of the first rubber seal,
a second rubber seal material is fixed to a position spaced downward from a first seal portion of the first rubber seal material so as to connect the support portions, and the gap between the support portions is blocked by a second seal portion of the second rubber seal material;
the second rubber seal member includes a leg portion connected to an end of the second seal portion and facing the support portion,
A manufacturing method for a bridge expansion device, wherein the leg portion has a joint portion that is joined to the support portion and/or the first rubber sealant, and a non-joint portion that overlaps the first rubber sealant on the second seal portion side of the joint portion and is not bonded to the first rubber sealant. A method for manufacturing a bridge expansion device that connects opposing bridge structures, comprising the steps of:
A first rubber seal is fixed so as to connect the support parts arranged at a predetermined distance from each other, and the gap between the support parts is sealed with a first seal part of the first rubber seal,
a second rubber seal material is fixed to a position spaced downward from a first seal portion of the first rubber seal material so as to connect the support portions, and the gap between the support portions is blocked by a second seal portion of the second rubber seal material;
A manufacturing method for a bridge expansion device, in which the second rubber sealant is joined to the supporting portion and/or the first rubber sealant so that the bonding strength between the first rubber sealant and the supporting portion is greater than the bonding strength between the second rubber sealant and the supporting portion and/or the first rubber sealant.

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