Expansion apparatus, and expansion apparatus installation method

Abstract

To provide an expansion apparatus having effectively improved durability and vehicle running performance.SOLUTION: Disclosed is an expansion apparatus 30 installed at a joint gap 13 between a pair of floor slabs 11A, 12A mutually facing at intervals in a bridge 10, which comprises: a pair of joint members 31, 31 fixed to gradation parts 11B, 12B formed at mutually facing edge parts of the floor slabs 11A, 12A respectively so that the upper ends thereof are positioned below the upper faces of asphalt pavement parts 11D, 12D paved at the upper faces of the floor slabs 11A, 12A; and an elastic pavement part 38 formed by paving an elastic paving material above the joint members 31, 31 of the gradation parts 11B, 12B to clog the upper end side of the joint gap 13, and further continuous with the asphalt pavement parts 11D, 12D.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to an expansion device and a method for installing an expansion device. [Background technology]

[0002] Generally, in bridges such as road bridges, expansion devices are installed in the gaps of bridge girders to absorb expansion and contraction of bridge girders due to temperature changes and deformation of bridge girders due to earthquakes and traffic loads. Examples of this type of expansion device include finger joint type, product joint type, and buried joint type.

[0003] An example of a finger-joint type expansion device is disclosed in Patent Document 1. The expansion device described in Patent Document 1 is configured by installing a sealing material, a backup material, etc. below a pair of steel finger plates that are interlocked and placed at the joints between deck slabs.

[0004] An example of a product joint type expansion device is disclosed in Patent Document 2. The expansion device described in Patent Document 2 is configured by installing elastic seal material, gutter members, etc. between matching joint members that have multiple anchors that are fixed to the ends of the deck slab with post-cast concrete.

[0005] Examples of buried joint type expansion devices are disclosed in Patent Documents 3 and 4. The expansion device described in Patent Document 3 is configured by placing a backup material between a pair of opposing bridge members to absorb expansion and contraction displacement, and filling and embedding a joining material in a recess provided above the gap. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2017-115496 A [Patent Document 2] Patent Publication No. 2019-120091 [Patent Document 3] JP 2014-240575 A [Patent Document 4] JP 2005-105599 A Summary of the Invention [Problem to be solved by the invention]

[0007] Finger-jointed and pre-assembled jointed expansion devices are used in bridges with relatively large amounts of expansion and contraction and deformation. Finger-jointed and pre-assembled jointed expansion devices have excellent watertightness and are less susceptible to deterioration due to water leaks, which gives them the advantage of a relatively long design service life. However, finger-jointed and pre-assembled jointed expansion devices are prone to unevenness at the connection points, which can cause vibrations and noise, impairing vehicle drivability. In particular, when finger-jointed and pre-assembled jointed expansion devices are used in vertical joints, unevenness can continue for a certain distance in the direction of vehicle travel, raising concerns about the generation of abnormal noise during vehicle travel and motorcycle overturning accidents.

[0008] Buried joint type expansion devices have the advantage of covering the upper part of the gap with elastic paving material such as a jointing material, so that the top surface is continuous with the asphalt pavement surface, suppressing noise generation and providing excellent vehicle travelability. However, because buried joint type expansion devices do not have high expansion performance, they cannot be applied to bridges with relatively large expansion and contraction amounts and deformations. In addition, buried joint type expansion devices are vulnerable to repeated bending and vibration, so their designed service life is shorter than that of finger joint type and pre-assembled joint type expansion devices. Furthermore, because it is difficult to install drainage structures with buried joint type expansion devices, if cracks or deterioration occur in the elastic paving material, rainwater and other substances will flow into the piers and abutments, accelerating the deterioration of the substructure.

[0009] In other words, there is a demand in the market for an expansion device that combines the durability that is an advantage of the finger joint type and the product joint type with the vehicle travelability that is an advantage of the buried joint type.

[0010] The technology of the present disclosure has been made in consideration of the above circumstances, and aims to provide an extension device that can effectively improve durability and vehicle drivability. [Means for solving the problem]

[0011] The telescopic device of the present disclosure comprises: An expansion device (30) installed in a gap (13) between a pair of opposing decks (11A, 12A) of a bridge (10) at a distance from each other, a pair of joint members (31, 31) fixed to stepped portions (11B, 12B) formed at opposing ends of the deck slabs (11A, 12A) so that their upper ends are positioned lower than the upper surfaces of asphalt pavement portions (11D, 12D) laid on the upper surfaces of the deck slabs (11A, 12A); an elastic pavement portion (38) formed by paving an elastic pavement material above the joint members (31, 31) of the stepped-down portions (11D, 12D), which closes the upper end side of the gap (13) and is continuous with the asphalt pavement portion (11D, 12D). It is characterized by:

[0012] In another aspect of the telescopic device of the present disclosure, The joint members (31, 31) include vertical plate portions (33, 33), A first elastic water-stopping member (36) for stopping water from entering the gap (13) is provided between the vertical plate portions (33, 33) of the pair of joint members (31, 31). It is desirable.

[0013] Another aspect of the telescopic device of the present disclosure is A second elastic water-stopping member (37) is provided which is detachably attached to the lower surface of the end of the floor slab (11A, 12A) and stops water from flowing through the lower end of the gap (13). It is desirable.

[0014] In another aspect of the telescopic device of the present disclosure, The pair of joint members (31, 31) each have a horizontal plate portion (32, 32) at the upper end, and a sheet-like edge insulating material (39) is provided between the horizontal plate portion (32, 32) and the elastic pavement portion (38). It is desirable.

[0015] In another aspect of the telescopic device of the present disclosure, The pair of joint members (31, 31) each have a vertical plate portion (33) from which an anchor member (34) protrudes, and are fixed to the ends of the deck slabs (11A, 12A) by pouring post-cast concrete (C) into the stepped portions (11B, 12B) where the anchor members (34) are arranged. The elastic pavement portion (38) is formed by paving the elastic pavement material on top of the joint members (31, 31) and the post-cast concrete (C). It is desirable.

[0016] In another aspect of the telescopic device of the present disclosure, The joint (13) is a vertical joint extending in the bridge axis direction, The pair of joint members (31, 31) each have a horizontal plate portion (32, 32) at an upper end thereof, The opposing ends of the pair of horizontal plate portions (32, 32) are formed in a linear shape extending in the bridge axis direction. It is desirable.

[0017] The method for installing an expansion device according to the present disclosure includes the steps of: A method for installing an expansion joint (30) in a gap (13) between a pair of opposing decks (11A, 12A) of a bridge (10) with a gap therebetween, comprising the steps of: Step-down portions (11B, 12B) are formed at the opposing ends of the deck slabs (11A, 12A), respectively; a pair of joint members (31, 31) are fixed to the stepped-down portions (11B, 12B) so that their upper ends are positioned below the upper surface of an asphalt pavement portion (11D, 12D) laid on the upper surface of the deck (11A, 12A); By laying an elastic paving material above the joint members (31, 31) of the stepped portions (11B, 12B), the upper end side of the gap (13) is closed and an elastic paving portion (38) continuous with the asphalt paving portion (11D, 12D) is formed. It is characterized by:

[0018] In the above description, to aid in understanding the present disclosure, the symbols used in the embodiments are added in parentheses to components corresponding to the embodiments, but each component is not limited to the embodiment defined by the symbol. [Effects of the Invention]

[0019] According to the technology of the present disclosure, the durability and vehicle travelling performance of the extension device can be effectively improved. [Brief explanation of the drawings]

[0020] [Figure 1] FIG. 1 is a schematic perspective view illustrating an outline of a method for replacing deck slabs of an existing bridge. [Figure 2] FIG. 1 is a schematic cross-sectional view showing an extension device according to an embodiment of the present invention. [Figure 3] FIG. 2 is a schematic perspective view showing a part of the extension device according to the present embodiment in a cutaway view. [Figure 4] FIG. 10 is a schematic perspective view showing a part of an extension device according to another embodiment, with a cutaway view. [Figure 5] FIG. 4 is a schematic cross-sectional view illustrating a first step of the method for installing the expansion device according to the present embodiment. [Figure 6] FIG. 10 is a schematic cross-sectional view illustrating a second step of the method for installing the expansion device according to the present embodiment. [Figure 7] FIG. 10 is a schematic cross-sectional view illustrating a third step of the method for installing the expansion device according to the present embodiment. [Figure 8] FIG. 10 is a schematic cross-sectional view illustrating a fourth step of the method for installing the expansion device according to the present embodiment. [Figure 9]FIG. 10 is a schematic cross-sectional view illustrating the process of installing a wall parapet after the installation of the expansion device according to the present embodiment. [Figure 10] FIG. 10 is a schematic cross-sectional view illustrating the process of installing a wall parapet after the installation of the expansion device according to the present embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0021] Hereinafter, the extension device and the installation method of the extension device according to this embodiment will be described with reference to the accompanying drawings.

[0022] [Overview] First, before describing the details of the expansion device of this embodiment, an outline of a deck replacement method for an existing bridge on which the expansion device of this embodiment is installed will be described.

[0023] FIG. 1 is a schematic perspective view of an existing bridge 10. The bridge 10 is, for example, a road bridge such as an expressway, and has a first bridge 11 for an inbound lane and a second bridge 12 for an outbound lane. The bridge 10 has a separated structure in which the first bridge 11 and the second bridge 12 are adjacent to each other with a gap 13 between them. The first bridge 11 includes, for example, an inbound driving lane L1 and an inbound passing lane L2 as lanes for vehicle travel. The second bridge 12 includes, for example, an outbound driving lane L4 and an outbound passing lane L3 as lanes for vehicle travel.

[0024] That is, the bridge 10 in the illustrated example is a four-lane road bridge (two lanes on each side) with four lanes L1 to L4. At the ends of each bridge 11, 12 in the width direction (direction X perpendicular to the bridge axis), shoulders S1, S2 are provided, respectively, onto which vehicles can retreat in emergencies, etc. Note that the number of lanes on the bridge 10 is not limited to four lanes as in the illustrated example, and may be, for example, six lanes or more (three lanes on each side), or may be two lanes (one lane on each side). Also, the bridge 10 does not have to be equipped with shoulders S1, S2.

[0025] One method of replacing the existing deck of bridge 10 with a new deck is to completely close either first bridge 11 or second bridge 12 to traffic and restrict two-way traffic on the other bridge, a method known as "full-section construction." However, full-section construction, which restricts two-way traffic, has the problem of making it difficult to maintain traffic volume and having a significant impact on the surrounding traffic environment.

[0026] One construction method that solves these problems is the so-called "half-section deck replacement method." In this method, for example, a temporary guardrail 15A is installed along the bridge axis direction Y at approximately the middle of the first bridge 11 in the direction orthogonal to the bridge axis X, thereby dividing the first bridge 11 into a work zone 16 for replacing the existing deck 20 and a traffic lane 17 through which vehicles can pass. In the work zone 16, the existing deck 20 and a portion of the existing balustrade 70 are removed, and new deck slabs and balustrades are installed. Furthermore, a temporary guardrail 15B is installed along the bridge axis direction Y on the second bridge 12, thereby turning a portion of the second bridge 12 into an uphill lane (an uphill passing lane in the illustrated example).

[0027] The half-section deck replacement method allows lane 17 to be used as a road on which vehicles can travel (in the illustrated example, an uphill lane), so traffic volume (number of lanes) can be secured more effectively than when restricting two-way traffic, such as with full-section construction. This type of half-section deck replacement method is also called the "width-direction division replacement method."

[0028] Since the bridge 10 has a separate structure in which the first bridge 11 and the second bridge 12 are separated, in order to use the lane 17 as a road on which vehicles can travel during construction, these bridges 11 and 12 must be connected to each other. However, the behavior of the first bridge 11 and the second bridge 12 is different, and differences in vertical and horizontal displacement may become large. For this reason, the first bridge 11 and the second bridge 12 cannot be rigidly connected using concrete, fiber-reinforced concrete, or the like. The expansion device 30 according to this embodiment is installed in the gap 13 between the first bridge 11 and the second bridge 12, and connects the first bridge 11 and the second bridge 12 so that the pavement surfaces are continuous while absorbing the difference in displacement between the first bridge 11 and the second bridge 12. The expansion device 30 will be described in detail below.

[0029] [Expansion device] Fig. 2 is a schematic cross-sectional view showing the extension device 30 according to this embodiment. Fig. 3 is a schematic perspective view showing a part of the extension device 30 according to this embodiment, which is cut away.

[0030] 2 and 3, the expansion device 30 is installed in the gap 13 between the deck 11A of the first bridge 11 and the deck 12A of the second bridge 12, which are adjacent in the direction orthogonal to the bridge axis X. Specifically, at the opposing ends of each deck 11A, 12A, box-out sections 11B, 12B (step-down sections of the present disclosure) are provided by cutting out the upper end sides in a stepped shape. The expansion device 30 is installed in these box-out sections 11B, 12B.

[0031] The expansion device 30 comprises a pair of joint members 31, 31, an elastic sealing member 36 (first elastic water-stopping member of the present disclosure) as a primary water-stopping material arranged between each joint member 31, 31, a gutter member 37 (second elastic water-stopping member of the present disclosure) as a secondary water-stopping material arranged on the lower end side of the gap 13, and an elastic paving portion 38 that blocks the upper end opening of the gap 13.

[0032] The joint members 31, 31 are, for example, metal plate members with an inverted L-shaped cross section, and include horizontal plate portions 32, 32 and vertical plate portions 33, 33 extending downward from the ends of the horizontal plate portions 32, 32. As shown in FIG. 3 , the ends of the horizontal plate portions 32, 32 opposite the vertical plate portions 33, 33 are formed linearly extending in the bridge axis direction Y. By making the ends of the horizontal plate portions 32, 32 linear in this way, it is possible to accommodate expansion, contraction, and displacement in the bridge axis direction Y. Note that, as shown in FIG. 4 , convex portions 32A and concave portions 32B may be formed alternately in the longitudinal direction at the ends of the horizontal plate portions 32, 32. In this case, the joint members 31, 31 may be arranged so that the convex portions 32A and the concave portions 32B face each other with a predetermined gap between them in the direction orthogonal to the bridge axis X.

[0033] Anchor members 34, 34 extending in the horizontal direction (direction perpendicular to the bridge axis X) protrude from the back surfaces of the vertical plate portions 33, 33, opposite the opposing surfaces. L-shaped or U-shaped embedded reinforcing bars 11C, 12C are embedded in the box-cut portions 11B, 12B of each deck slab 11A, 12A with their upper ends exposed. The anchor members 34, 34 are fixed to the embedded reinforcing bars 11C, 12C via through bars 35, 35 extending longitudinally (in the bridge axis direction Y) through the gap 13. In this case, the joint members 31, 31 are installed using sponge members S for adjusting the height so that the vertical position of the horizontal plate portion 32 is approximately aligned with the upper surface (top surface) of each deck slab 11A, 12A.

[0034] The joint members 31, 31 are fixed to the ends of the respective deck slabs 11A, 12A by pouring post-cast concrete C into gaps between the anchor members 34, 34 of the box cutout portions 11B, 12B, the through bars 35, 35, and the embedded reinforcing bars 11C, 12C. The shape of the joint members 31, 31 is not limited to the inverted L-shaped cross section shown in the illustration, and may be T-shaped or L-shaped in cross section.

[0035] The elastic sealing member 36 is a block-shaped member made of an elastically deformable material, such as rubber, with a rectangular cross section. Both sides of the elastic sealing member 36 in the width direction (the direction perpendicular to the bridge axis X) are closely adhered to the opposing surfaces of the vertical plate portions 33, 33. A backup material 36A is provided below the elastic sealing member 36 to prevent leakage when the elastic sealing member 36 is filled. The elastic sealing member 36 is provided between the vertical plate portions 33, 33 over the entire length of the gap 13 in the longitudinal direction (the bridge axis direction Y). The elastic sealing member 36 absorbs the displacement and expansion and contraction of the deck slabs 11A, 12A by elastic deformation, while preventing rainwater and other elements from penetrating the gap 13 through the gaps between the joint members 31, 31. Instead of the elastic sealing member 36, a so-called dry waterstop material can be installed between the vertical plate portions 33, 33.

[0036] The gutter member 37 is a sheet-like member made of an elastically deformable material such as rubber. The gutter member 37 is attached to the lower end of the gap 13 so as to be curved downward in a substantially U-shape. The gutter member 37 is provided over the entire length of the gap 13 in the longitudinal direction (bridge axis direction Y) so as to close the lower end opening of the gap 13. The gutter member 37 absorbs the displacement and expansion / contraction of the deck slabs 11A, 12A by elastically deforming, and if rainwater or the like seeps in through gaps between the joint members 31, 31 due to deterioration of the elastic sealing member 36 or the like, the gutter member 37 guides the water to a drainage pipe or the like (not shown) and drains it, thereby preventing the rainwater or the like from falling under the bridge.

[0037] In this embodiment, both ends of the gutter member 37 in the width direction (the direction orthogonal to the bridge axis X), which is perpendicular to the longitudinal direction, are detachably attached to the undersides of the ends of the deck slabs 11A, 12A via resin plates 37A and bolts B. By detachably attaching the gutter member 37 to the undersides of the deck slabs 11A, 12A in this way, for example, when replacing the gutter member 37 due to deterioration or other reasons, the work can be performed without removing the joint members 31. In other words, the replacement work of the gutter member 37 can be easily performed, and maintainability can be reliably improved. Note that depending on the bridge structure, there may be cases where access from below between the deck slabs 11A, 12A is not possible. In such a structure, the gutter member 37 may be directly attached to the lower ends of each vertical plate portion 33, 33 when installing the expansion device 30.

[0038] The elastic pavement 38 is formed by paving an elastic pavement material on the upper surfaces (top surfaces) of the horizontal plate portions 32, 32 of the joint members 31, 31 and the upper surfaces (top surfaces) of the post-cast concrete C so that it is continuous with the asphalt pavement 11D, 12D of each deck slab 11A, 12A. While the type of elastic pavement material is not particularly limited, it is desirable to use a material that is highly elastic, has elasticity and conforms to expansion and contraction, and has abrasion resistance comparable to that of the asphalt pavement 11D, 12D. An example of a highly elastic pavement material is Falcon (product name) manufactured by Heatlock Industries, Ltd., which has skid resistance equivalent to that of heated asphalt mixture. By paving the elastic pavement material on the upper surfaces of the joint members 31, 31 in this way and providing the elastic pavement 38 that is continuous with the asphalt pavement 11D, 12D, the top surfaces of the vertical joints between the decks 11A, 12A are substantially flat with no steps. This reduces the vibrations and noise that occur when the vehicle is running, thereby improving the vehicle's running performance.

[0039] As will be described in detail later, after installing the expansion device 30, new balustrades may be installed at the ends of each deck slab 11A, 12A. In this case, it is necessary to remove part of the elastic pavement 38 and the asphalt pavement 11D, 12D in order to install the new balustrades. If the elastic pavement material that makes up the elastic pavement 38 is in close contact with the upper surfaces of the horizontal plate portions 32, 32 of the joint member 31, this will impair workability. Therefore, when installing new balustrades, or if there is a possibility of installing new balustrades in the future, it is desirable to install an edge-cutting material 39, such as an aluminum sheet, between the upper surfaces of the horizontal plate portions 32, 32 and the elastic pavement 38 when installing the expansion device 30.

[0040] In this way, by providing the edge separator 39 between the horizontal boards 32, 32 and the elastic paving 38, the elastic paving 38 can be easily removed when installing a new balustrade, thereby reliably improving workability. Furthermore, whether or not a new balustrade is installed, providing the edge separator 39 when paving the elastic paving material makes it possible to effectively prevent the elastic paving material from seeping into the gap 13.

[0041] [Expansion joint installation process] Next, a method for installing the extension device 30 according to this embodiment will be described with reference to FIGS.

[0042] In the first step shown in Figure 5, the existing wall parapets and ground coverings are removed, and the upper ends of the opposing ends of each deck slab 11A, 12A are cut out in a stepped shape to form box cutout portions 11B, 12B.

[0043] 6, the joint members 31, 31 to which the elastic seal members 36 have been attached are installed in the cutout sections 11B, 12B. Specifically, the anchor members 34, 34 protruding from the vertical plate members 33, 33 are fixed to the embedded reinforcing bars 11C, 12C exposed from the bottom surfaces of the cutout sections 11B, 12B via through bars 35, 35. At this time, the joint members 31, 31 are installed so that the vertical position of the horizontal plate members 32 is approximately flush with the top surfaces of the deck slabs 11A, 12A by interposing a sponge member S between the bottom surfaces of the cutout sections 11B, 12B and the vertical plate members 33, 33.

[0044] In Fig. 6, gutter members 37 are attached to the undersides of the ends of deck slabs 11A and 12A via resin plates 37A with bolts B. The attachment of gutter members 37 may be performed in parallel with the second step, or in parallel with the third or fourth step described below, or after the fourth step is completed.

[0045] Next, in the third step shown in FIG. 7, post-cast concrete C is poured into the gaps between the anchor members 34, 34 of the box cutout portions 11B, 12B, the through bars 35, 35, and the embedded reinforcing bars 11C, 12C, thereby fixing the joint members 31, 31 to the ends of the respective deck slabs 11A, 12A. At this time, the post-cast concrete C is poured to a height approximately flush with the top surfaces of the respective deck slabs 11A, 12A. The post-cast concrete C may be ordinary concrete, fiber-reinforced concrete, mortar, fiber-reinforced mortar, or the like. Various cement compositions can be used for the post-cast concrete C.

[0046] Next, in the fourth step shown in Figure 8, a siding material 39 is placed on the top surfaces of the horizontal plate portions 32, 32 of the joint members 31, 31, and an elastic paving material is laid on top of the siding material 39 and the post-poured concrete C to construct an elastic paving section 38. At this time, the elastic paving material is laid to approximately the same height as the top surface of the asphalt paving 11D, 12D. This makes the top surface of the vertical grain portion, which is the connection between the deck slabs 11A, 12A, flat and without any steps. Once the elastic paving section 38 has been constructed, the installation of the expansion device 30 is complete.

[0047] Once the deck replacement work for the first bridge 11 and the second bridge 12 in the section where the expansion joint 30 is installed is completed, new balustrades are installed at the ends of each deck slab 11A, 12A in that section, as shown in Figures 9 and 10. Note that the subsequent steps will not be carried out if new installation of balustrades is not required due to the road structure, etc.

[0048] 9, a space SP for installing a new balustrade is formed by removing a portion of the elastic pavement 38 and the asphalt pavement 11D, 12D. At this time, because the edge separator 39 is provided between the elastic pavement 38 and the horizontal plate portions 32, 32 of the joint members 31, 31, the elastic pavement can be easily removed without remaining on the upper surfaces of the horizontal plate portions 32, 32.

[0049] In the parapet installation process shown in Figure 10, a new parapet 80 is installed in the space SP. The new parapet 80 may be a precast concrete parapet, a steel parapet, or a cast-in-place concrete parapet. Once the new parapet 80 is installed, the road in that section is fully opened to traffic.

[0050] According to the present embodiment described above in detail, the expansion device 30 comprises a pair of joint members 31, 31 that are fixed so that their upper surfaces are positioned lower than the top surfaces of the asphalt paving 11D, 12D by pouring post-poured concrete C into the box-out portions 11B, 12B formed at the ends of each deck slab 11A, 12A, and an elastic paving portion 38 that is formed by paving the post-poured concrete C and elastic paving material on the upper surfaces of the joint members 31, 31 at approximately the same height as the asphalt paving 11D, 12D.

[0051] That is, the expansion device 30 is constructed by placing joint members 31, 31, which have excellent expansion and contraction performance and can accommodate drainage structures, in the gap 13, and forming an elastic pavement 38 that is continuous with the asphalt pavement 11D, 12D on top of the joint members 31, 31. As a result, the expansion and contraction and deformation of the bridges 11, 12 can be effectively absorbed by the joint members 31, 31, while the elastic pavement 38 can make the joints of the deck slabs 11A, 12A flat and step-free, thereby reliably improving vehicle travelability. Furthermore, because no step extending in the bridge axis direction Y occurs at the joints of the deck slabs 11A, 12A, it is possible to effectively prevent the generation of abnormal noises associated with vehicle travel and motorcycle tip-over accidents.

[0052] The expansion device 30 also has a waterproof structure that, from top to bottom, comprises an elastic pavement 38 paved with elastic paving material, an elastic sealing member 36 formed in a block shape from an elastically deformable material such as rubber, and a gutter member 37 formed in a sheet shape from an elastically deformable material such as rubber. In other words, a triple waterproof structure is constructed in which rainwater and other water on the road surface is prevented from seeping into the gap 13 by the elastic pavement 38, and if the elastic pavement 38 deteriorates, the elastic sealing member 36 prevents the intrusion of rainwater and other water, and if the elastic sealing member 36 deteriorates, the gutter member 37 prevents rainwater and other water from falling below the bridge. This effectively prevents drainage such as rainwater from flowing into the piers and abutments, and also effectively suppresses deterioration of the substructure.

[0053] [others] The present disclosure is not limited to the above-described embodiments, and can be modified as appropriate within the scope of the present disclosure.

[0054] For example, in the above embodiment, the pair of joint members 31, 31 was described as a so-called product joint type as an example, but it is also possible to use a finger joint type joint member having a pair of finger plates arranged in an interlocking state. Furthermore, in the above embodiment, an example was described in which the bridge slabs 11, 12 of the inbound and outbound lanes are connected to each other in the deck replacement work of the existing bridge 10. However, the present disclosure can be widely applied to other construction work that connects adjacent deck slabs, such as widening work to increase the number of lanes of the existing bridge 10 or construction of a new bridge. Furthermore, the location where the expansion device 30 is installed is not limited to a vertical joint, and it can also be installed in a horizontal joint. Furthermore, the technology disclosed herein can be widely applied to bridges other than road bridges. [Explanation of symbols]

[0055] 10...Bridge, 11...First bridge, 12...Second bridge, 11A, 12A...Deck slab, 11B, 12B...Box cutout section, 11C, 12C...Embedded rebar, 11D, 12D...Asphalt pavement, 13...Gap, 30...Expansion device, 31...Joint member, 32...Horizontal plate section, 32A...Convex portion, 32B...Concave portion, 33...Vertical plate section, 34...Anchor member, 35...Through bar, 36...Elastic sealing member, 37...Gutter member, 37A...Resin plate, B...Bolt, 38...Elastic pavement section, 39...Edge cutting material, L1...Uphill driving lane, L2...Uphill passing lane, L3...Downhill passing lane, L4...Downhill driving lane, 15A, 15B...Temporary protective fence, 16...Work zone, 17...Traffic lane, 20...Existing deck slab, 70...Existing wall parapet, 80...Wall parapet

Claims

1. An expansion device installed in the gap between a pair of deck slabs facing each other at a distance from each other of a bridge, A pair of joint members fixed to stepped portions formed at opposing ends of the deck slab so that their upper ends are positioned below the upper surface of the asphalt pavement portion paved on the upper surface of the deck slab; and an elastic pavement portion formed by paving an elastic paving material above the joint member of the step-down portion, which closes the upper end side of the gap and is continuous with the asphalt pavement portion. An expansion device characterized by:

2. The telescopic device according to claim 1, The coupling member includes a vertical plate portion, A first elastic water-stopping member that stops water from entering the gap is provided between the vertical plate portions of the pair of joint members. An expansion device characterized by:

3. The telescopic device according to claim 1 or 2, A second elastic water-stopping member is provided which is detachably attached to the underside of the end of the deck slab and stops water from flowing through the lower end of the gap. An expansion device characterized by:

4. The telescopic device according to claim 1, The pair of joint members each have a horizontal plate portion at the upper end, and a sheet-like edge insulating material is provided between the horizontal plate portion and the elastic pavement portion. An expansion device characterized by:

5. The telescopic device according to claim 1, The pair of joint members each have a vertical plate portion from which an anchor member is protruded, and are fixed to the end portion of the deck by pouring post-cast concrete into the step-down portion where the anchor member is arranged. The elastic pavement portion is formed by paving the elastic pavement material on top of the joint member and the post-cast concrete. An expansion device characterized by:

6. The telescopic device according to claim 1, The joint is a vertical joint extending in the bridge axis direction, The pair of joint members each include a horizontal plate portion at an upper end, The opposing ends of the pair of horizontal plate portions are formed in a straight line extending in the bridge axis direction. An expansion device characterized by:

7. A method for installing an expansion device in a gap between a pair of deck slabs of a bridge that face each other at a distance, comprising: Step-down portions are formed at the opposing ends of the deck slabs, A pair of joint members are fixed to the stepped portion so that their upper ends are positioned below the upper surface of the asphalt pavement portion paved on the upper surface of the deck, By paving the step-down portion above the joint member, the upper end side of the gap is blocked and an elastic pavement portion that is continuous with the asphalt pavement portion is formed. A method for installing an expansion device.

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