Bridge expansion device and its manufacturing method

Abstract

To provide an extending device for a bridge with excellent sealability, and its manufacturing method.SOLUTION: A first rubber seal material 16 and a second rubber seal material 18 are connected separately in an up-down direction between a pair of support parts 20, 20. In the first rubber seal material 16, a pair of downwardly extending first leg parts 16a, 16a connected to end parts of a hanging-down first seal part 16b in a separation direction of the support parts 20, 20 are vulcanized and adhered to the corresponding support parts 20, 20. In the second rubber seal material 18, a pair of downwardly extending second leg parts 18a, 18a connected to end parts of a hanging-down second seal portion 18b in the separation direction of the support parts 20, 20 are adhered by adhesives 26 to the corresponding support parts 20, 20.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a bridge expansion device to be installed at a joint of a bridge structure, and a method for manufacturing the same. [Background technology]

[0002] In bridges such as road bridges, a superstructure having a deck and bridge girders is suspended above a substructure such as a pier and abutment, and is connected to an access 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, etc., in such bridge superstructures, a bridge expansion device (see, for example, Patent Document 1) is installed at the joint between the deck and road or between the decks themselves. The bridge expansion device disclosed in Patent Document 1 has a pair of support parts that are connected to the deck or road and spaced apart at a predetermined interval, and a rubber sealant that is bonded to be installed between the two support parts, and allows the expansion and contraction of the deck or road through the gap (gap) between the pair of support parts, while the rubber sealant prevents rainwater, sand, gravel, etc. from falling through the gap. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 4601689 Summary of the Invention [Problem to be solved by the invention]

[0004] 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 vehicle load applied through sand and gravel accumulated on the surface can cause tears and cracks in the rubber sealant over time, reducing its sealing ability, and making it impossible to prevent rainwater, sand and gravel from falling through the gaps, which can have adverse effects such as corroding and deteriorating the structures below the rubber sealant.

[0005] That is, an object of the present invention is to provide a bridge expansion device with excellent sealing properties and a manufacturing method thereof. [Means for solving the problem]

[0006] In order to overcome the problems and achieve the intended object, the first invention of the present application is: 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, by providing the second rubber sealant 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.

[0007] The second invention is The gist of the 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.

[0008] 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, and the leg portion is joined to the support portion and / or the first rubber sealant, The gist of the present invention is that a non-jointed portion is provided on the leg portion of the second rubber seal material at an end side 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.

[0009] 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 sealant is fixed to a position spaced below the first seal portion of the first rubber sealant so as to connect the support portions, and the gap between the support portions is sealed by the second seal portion of the second rubber sealant. In this way, since the first rubber sealing material has a first folded portion that is elastically deformable, the second rubber sealing material can be easily installed by elastically deforming the first folded portion to widen the gap between the pair of support portions.

[0010] The fifth invention is The gist of the invention is that the second rubber sealing material is joined to the support portion and / or the first rubber sealing material so that the bonding strength between the first rubber sealing material and the support portion is greater than the bonding strength between the second rubber sealing material and the support 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.

[0011] 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 sealant and the second seal portion, and the leg portion is joined to the support portion and / or the first rubber sealant. 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 joints with the support part and the first leg part is reduced, preventing damage, etc. Effect of the Invention

[0012] According to the present invention, the sealing performance of a bridge expansion joint can be improved. [Brief description of the drawings]

[0013] [Figure 1] 1 is a schematic plan view showing a bridge expansion device according to an embodiment of the present invention. [Diagram 2] 2 is a cross-sectional view taken along line AA in FIG. 1, in which (a) shows a state before the gap (gap) is expanded, and (b) shows a state after the gap (gap) is expanded. [Diagram 3] 1 is a table evaluating the adhesives of the examples and comparative examples. [Figure 4] FIG. 4 is an explanatory diagram showing a manufacturing process of the bridge expansion device according to the embodiment. [Diagram 5] FIG. 2 is a schematic vertical cross-sectional view showing a bridge expansion device according to a first alternative embodiment. [Figure 6] FIG. 11 is a schematic vertical cross-sectional view showing a bridge expansion device according to a second alternative embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Next, a bridge expansion device and a manufacturing method thereof according to the present invention will be described below by way of preferred embodiments with reference to the accompanying drawings.

[0015] 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 Figs. 1 and 2, the bridge expansion device 10 includes a pair of joint members 12, 12 arranged facing each other with a predetermined distance between them, a first rubber seal member 16 provided in a gap (hereinafter referred to as a clearance gap) 14 between the joint members 12, 12, and a second rubber seal member 18 provided at a position spaced below the first seal portion 16b of the first rubber seal member 16 in the clearance gap 14. The joint member 12 includes a plate-shaped support member 20, a bottom plate 22 provided at the lower end of the support member 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 member 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 capable of preventing 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, and 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.

[0016] The first rubber seal material 16 is made of, for example, chloroprene rubber (CR) and is vulcanized and bonded to the pair of support parts 20, 20, and includes first legs 16a, 16a extending vertically along each support part 20, and a first seal part 16b connected between the upper ends of both first legs 16a, 16a and hanging down in a generally U-shape, with the outer surfaces of both first legs 16a, 16a being vulcanized and bonded to the inner surfaces of each support part 20, and the first seal part 16b facing between the pair of support parts 20, 20. That is, the first legs 16a, 16a are connected to the ends of the first seal part 16b in the direction of separation of the support parts 20, 20 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 material 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 closes 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 portion 16b elastically deforms to follow the movement of the support parts 20, 20. The first rubber seal 16 is provided with stoppers 16c protruding inwardly at positions below the lower ends of the first seal portions 16b of the first leg parts 16a, and is configured so that the second rubber seal 18 can be positioned by the stoppers 16c, 16c when the second rubber seal 18 is bonded as described below (see FIG. 4(d)).

[0017] 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 substantially 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 a substantially U-shape, with the outer surfaces of both second leg parts 18a, 18a bonded to the inner surfaces of each support part 20 with the adhesive 26, and the second seal part 18b facing between the pair of support parts 20, 20. That is, the second leg portions 18a, 18a are connected to the ends of the second seal portion 18b in the separating direction 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 spaced downward from the first seal portion 16b to close the gap 14. The second rubber seal material 18 is 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 the second seal portion 18b elastically deforms to follow the movement of the support portions 20, 20 when the gap 14 expands and contracts.

[0018] In addition, the second rubber seal 18 is provided with 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 is provided with 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 the second leg portions 18a, 18a of the second rubber seal 18 can elastically deform at the non-jointed portions 28, 28 when the gap 14 expands. Note that the material of the first rubber seal 16 and the second rubber seal 18 can be any rubber other than chloroprene rubber as long as it is not porous and does not allow rainwater to penetrate.

[0019] Here, we will explain the results of evaluating the adhesive 26 used to bond the second rubber sealant 18 and the support portion 20 in terms of the type suitable for use in the bridge expansion device 10, based on the examples and comparative examples shown in Figure 3.

[0020] The types and various physical properties of the examples and comparative examples are as shown in Figure 3. The example is manufactured by Shin-Etsu Chemical Co., Ltd. under the product name Sealant Master 300, the comparative example 1 is manufactured by Momentive Performance Materials Japan LLC under the product name TSE-385, the comparative example 2 is manufactured by Shin-Etsu Chemical Co., Ltd. under the product name KE-4920-T, and the comparative example 3 is manufactured by Shin-Etsu Chemical Co., Ltd. under the product name Sealant 70. The tensile stress and breaking elongation in the physical properties after curing were measured in accordance with JIS K 6849.

[0021] 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 application of the adhesive were observed, and a comprehensive judgment was made. Regarding the adhesive peel strength, a sample made of chloroprene rubber with a width of 20 mm was prepared, and the adhesive peel strength was measured according to JIS K 6854-2 (1999) for each of the following cases: when the sample was adhered to an untreated steel material made of SS400 and the surface of which was not pretreated, when the sample was adhered to chloroprene rubber, and when the sample was adhered to a treated steel material made of SS400 and the surface of which was coated with a primer and an overcoat for vulcanization adhesion and then baked and dried. In addition, the behavior immediately after application was evaluated by applying the adhesive to a vertical wall and determining whether the adhesive dripped or not.

[0022] 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 an adhesive peel strength that met the standard value, had sufficient strength for use in bridge expansion devices, and were excellent in workability, so they were rated as "◎".

[0023] Comparative Example 1 is a one-liquid adhesive, and the adhesive peel strengths of untreated steel, chloroprene rubber, and treated steel were all lower than the standard values, and the peeling state 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 application workability was poor. 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 judged to be "X."

[0024] Comparative Example 2 is a one-liquid type adhesive, and the adhesive peel strength with untreated steel material 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 material was broken (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, did not have sufficient strength when used in a bridge expansion device, and had poor workability, so was judged to be "X."

[0025] Comparative Example 3 was a two-liquid adhesive, and mixing the two liquids was complicated, and the adhesive thickened during application, making it difficult to work with. 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.

[0026] From the above evaluation, as the adhesive 26 used for bonding 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 work of mixing two components as with a two-component type adhesive, does not thicken during application, and does not drip, making it extremely easy to work with. Also, an adhesive having an adhesive peel strength of 50N / 20mm or more and satisfying the condition of no interfacial peeling is also preferable 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.

[0027] 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 material 17 is set in the gap 14 between the pair of support parts 20, 20. Here, in this embodiment, a chloroprene rubber material is used as the unvulcanized rubber 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 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).

[0028] For the second rubber seal 18, the upper and lower dies 30, 32 used in the vulcanization molding of the first rubber seal 16 and the pair of joint members 12, 12 to which the first rubber seal 16 is not vulcanized are used, and an unvulcanized rubber material is set in the gap 14 between the pair of support parts 20, 20 in the same manner as in the vulcanization molding of the first rubber seal 16. Here, in this embodiment, a chloroprene rubber material is used as the unvulcanized rubber material for forming the second rubber seal 18, similar to the first rubber seal 16. Then, in this state, an upper die (die) 30 is pressed into the gap 14 from above under a predetermined pressure, and a lower die (die) 32 is pressed into the gap 14 from above under a predetermined pressure, and the unvulcanized rubber material is vulcanized to vulcanize the second rubber seal 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 so that the second rubber seal material 18 does not adhere to the support part 20 by vulcanization. Then, the pair of support parts 20, 20 are separated and the upper mold 30 and the lower mold 32 are opened, whereby the second rubber seal material 18 having the same shape as the first rubber seal material 16 is obtained.

[0029] Prior to the bonding operation of bonding the second rubber sealant 18 to the pair of supports 20, 20 to which the first rubber sealant 16 is vulcanization bonded, various pretreatments such as deoiling / wiping treatment and surface treatment by sandblasting are performed on the area of ​​the support 20 to which the first leg 16a of the first rubber sealant 16 is not vulcanization bonded (the bonding area of ​​the second rubber sealant 18) to remove the primer used when the first rubber sealant 16 was vulcanization bonded.

[0030] Next, masking treatment is performed by applying masking tape 36 to the formation position of non-joint portion 28 provided on the connecting end side of second leg portion 18a of second rubber seal material 18 with second seal portion 18b. Specifically, in this embodiment, masking tape 36 is applied to a predetermined range of the lower inner surface of first leg portion 16a of first rubber seal material 16 (connected to first seal portion 16b from the bonding area) to secure an area where first rubber seal material 16 and second rubber seal material 18 are not bonded by adhesive 26. Note that, as masking tape 36, a tape made of, for example, polyethylene to which adhesive 26 does not adhere can be used, but a tape made of another material can be used as long as adhesive 26 does not adhere.

[0031] Then, adhesive 26 is applied to the bonding area of ​​the second rubber seal material 18 in each support portion 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 is vulcanization bonded turned upside down, as shown in Fig. 4(c). Note that although the pair of support portions 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 portion 16b of the first rubber seal material 16 is elastically deformed to widen the gap 14 between the pair of support portions 20, 20.

[0032] A fixing jig 38 is attached between the second leg portions 18a, 18a of the vulcanization-molded second rubber seal material 18 with double-sided tape or the like to maintain the separation between the second leg portions 18a, 18a, and the second rubber seal material 18 is inserted between the pair of supports 20, 20 from its seal portion side and positioned at 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 turned 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 portion, as shown in Fig. 4(d). Then, by reducing the gap 14 between the pair of supports 20, the second leg 18a of the second rubber sealant 18 is clamped and pressed between the fixing jig 38 and the supports 20, and the state is cured until the second leg 18a is bonded to the supportant 20 by the adhesive 26. By removing the fixing jig 38 from the second rubber sealant 18 with the second leg 18a bonded to the supports 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.

[0033] 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, and deterioration due to physical loads such as the contact of tires and the load of a 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, gravel, etc. can be prevented from falling from the gap 14, and adverse effects on structures below can be prevented. In addition, even if a tear or crack occurs in the first rubber sealant 16, the second rubber sealant 18 can prevent rainwater, sand, gravel, etc. from falling from the gap 14, so that the frequency of replacement of the bridge expansion device 10 can be reduced, and the work time and cost associated with replacement can be reduced. Furthermore, since the first rubber seal material 16 and the second rubber seal material 18 have elastically deformable seal portions 16b, 18b of approximately the same shape, good compliance with the expansion and contraction of the gap 14 can be maintained even when the second rubber seal material 18 is added.

[0034] In the bridge extension device 10 of the embodiment, the first rubber seal material 16 is vulcanization-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, the second rubber seal material 18 is bonded to the support part 20 with an adhesive 26, so that 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 the first rubber seal material 16 exposed to the road surface to be bonded to a higher bonding strength than the second rubber seal material 18 not exposed to the road surface, 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 can be suppressed, the installation work of the second rubber seal material 18 can be simplified.

[0035] Since 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, when the gap 14 expands, not only the second seal portion 18b but also the non-bonded portions 28, 28 of the second leg portions 18a, 18a of the second rubber seal 18 elastically deform as shown in Fig. 2(b). In other words, when the gap 14 expands, the second rubber seal 18 elastically deforms over a wide range, so that it is possible to prevent a large load from being applied to the joint between the second leg portions 18a, 18a and the support portions 20, 20 in a direction that would peel the joint, and it is possible to prevent problems such as the second rubber seal 18 peeling off from the support portions 20, 20 or being damaged.

[0036] Since the first rubber seal material 16 having the elastically deformable first seal portion 16b is vulcanization-bonded to the pair of supporting parts 20, 20 and then the second rubber seal material 18 is bonded to the supporting parts 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 supporting parts 20, 20 in a state in which the gap 14 of the supporting parts 20, 20 is widened by elastically deforming the first seal portion 16b. In other words, the bonding work of the second rubber seal material 18 (the work of providing the second rubber seal material 18 between the pair of supporting parts 20, 20) is easy and the work time can be shortened, so that a bridge expansion device 10 with excellent sealing properties can be easily manufactured.

[0037] Before applying the adhesive 26 to the adhesion 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 protrudes from the adhesion area when the second legs 18a, 18a of the second rubber sealant 18 are sandwiched and pressed between the fixing jig 38 and the supports 20, 20, the legs 16a, 18a of both sealants 16, 18 are not bonded by the adhesive 26, and the non-bonding area 28 can be reliably provided. In addition, before bonding the second rubber sealant 18, the inner side of the supports 20, 20 to which the second legs 18a, 18a are bonded is subjected to a surface roughening treatment to form a large number of irregularities on the inner side, so that the bonding area of ​​the adhesive 26 can be increased and the bonding strength between the second legs 18a, 18a and the supports 20, 20 can be increased. In this embodiment, the second rubber seal material 18 is vulcanized using the same dies 30, 32 that are used to vulcanize the first rubber seal material 16, so that the die costs can be reduced.

[0038] 5 and 6 show a bridge expansion device according to another embodiment, and only the parts that differ from the embodiment will be explained, with the same reference numerals being used to designate the same members as those already described.

[0039] In the bridge extension device 40 according to the first alternative embodiment shown in Fig. 5, the second leg portions 18a, 18a of the second rubber seal material 18 are bonded by the adhesive 26 to the inner side surface of the first leg portions 16a, 16a of the first rubber seal material 16 that is bonded by vulcanization to a pair of support portions 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 that of the embodiment, except that the part (adhesion area) to which the adhesive 26 is applied during the bonding operation of the second rubber seal material 18 is changed to the inner side surface of the first leg portion 16a of the first rubber seal material 16.

[0040] In the bridge expansion device 42 according to the second alternative embodiment shown in Fig. 6, one of the second leg portions 18a of the second rubber seal material 18 is directly bonded to the support portion 20 by the adhesive 26, while the other of the second leg portions 18a of the second rubber seal material 18 is bonded to the inner surface of one of the first leg portions 16a of the first rubber seal material 16 by the adhesive 26. In the second alternative embodiment as well, a necessary and sufficient adhesive peel strength can be obtained by using the adhesive of the embodiment shown in Fig. 3. In addition, the manufacturing method is the same as that of the embodiment, except that the portion (adhesive area) to which the adhesive 26 is applied during the bonding operation of the second rubber seal material 18 is changed.

[0041] The bridge expansion devices 40, 42 according to the first and second alternative embodiments have the same functions and effects as those of the embodiments.

[0042] (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 sealing material is provided on the first leg of the first rubber sealing material, but the stopper can be omitted if a separate member is used to set the second rubber sealing material in the appropriate position between a pair of supports. 2. In the embodiment, the sealing portion of each sealing material is formed into a U-shape, but various shapes that can be elastically deformed in response to the expansion and contraction of the gap, such as a V-shape or a concave shape, can be used. [Explanation of symbols]

[0043] 14 gap (gap), 16 first rubber seal material, 16a first leg portion, 16b first seal portion 18 second rubber seal member, 18a second leg portion, 18b second seal portion, 20 support portion 26 Adhesive, 28 Non-jointed part, 30 Upper mold (mold), 32 Lower mold (mold)

Claims

1. 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.

2. 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.

3. 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 gaps 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.

4. 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 gaps 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.

5. 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 gaps 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.

6. 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 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.

7. 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.

8. 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.

9. 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.

10. 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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