JP2011117233A - Joint structure of bridge - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a joint structure of a bridge which has superior extending/retracting function and prevents cracking from occurring in the road surface of the bridge. <P>SOLUTION: A block 5 is vertically moved by the mutual separation and approach of the left contact surface 2b and the right contact surface 3b of a left side bridge body 2 and a right side bridge body 3 by the extension/retraction of the left side bridge body 2 and the right side bridge body 3 due to a temperature change in summer and winter. Since a joint rubber 4 the lateral width and the thickness of which change according to the extension/retraction of the left side bridge body 2 and the right side bridge body 3 is vertically moved, the flat surface 4a of the joint rubber 4 and the front surfaces S of the left side bridge body 2 and the right side bridge body 3 can be continuously maintained to be flush with each other without any gap. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a bridge joint structure in which a joint rubber is disposed.

  This will be described with reference to FIGS. In general, a bridge erected on a river, a lake, the ground, or the like has a joint 10 between an adjacent left bridge body 11 and a right bridge body 12 in order to cope with expansion and contraction of the bridge due to temperature changes such as summer and winter. The joint 10 is provided with a joint rubber 13 having a comb-like iron plate and an opening and having high stretchability (see FIG. 2).

  Various structures exist in the joint portion 10 of the bridge in which the joint rubber 13 is disposed. In many cases, an opening recess 14 is formed in a surface layer portion of the joint portion 10. For this reason, sand or the like enters the opening recess 14, and if the regular maintenance is neglected, there is a problem that the expansion / contraction function of the joint 10 is hindered. Moreover, since traffic regulation is required when maintenance is performed, there is a problem that traffic congestion is caused. Furthermore, since the unevenness is formed on the road surface by the opening recess 14, there is a problem that noise due to passing of the vehicle becomes high.

  On the other hand, a bridge joint structure that does not form such an opening recess 14 has also been devised (see, for example, Patent Document 1). As shown in FIG. 3, the joint structure is provided with an expansion / contraction device 15 between the adjacent left bridge body 11 and right bridge body 12, and a rubber material 16 is filled in a triangular concave portion at the center thereof. Asphalt 17 is continuously laid without gaps. This conventional technique does not have the problem that sand enters because the joint 10 does not have the opening recess 14.

  However, the above-described conventional technique has a problem that the asphalt 17 is cracked due to repeated expansion and contraction of the expansion and contraction device 15 because the asphalt 17 is continuously laid without gaps in the joint 10 of the bridge.

  The present invention has been devised in view of these problems, and an object thereof is to provide a bridge joint structure that is excellent in expansion and contraction functions and that does not cause cracks on the road surface.

  This will be described with reference to FIG. 1 and FIGS. The bridge joint structure according to claim 1 is a bridge constructed on a river, a lake, or on the ground, in a joint 1 formed between end faces where the gap between the adjacent left bridge body 2 and the right bridge body 3 changes. It is a structure and is always densely arranged in the upper gap U formed at the upper part between the end surfaces of the left bridge body 2 and the right bridge body 3, and the upper surface is the surface layer S of the left bridge body 2 and the right bridge body 3. The joint rubber 4 is provided with a continuous flat surface 4a that is flush with the flat surface 4a without gap.

  The bridge connecting portion structure according to claim 2 is a bridge constructed on a river, a lake, or the ground, and is formed of a joint 1 formed between end faces where a gap between adjacent left and right bridge bodies 2 and 3 changes. It is a structure and is always densely arranged in the upper gap U formed at the upper part between the end surfaces of the left bridge body 2 and the right bridge body 3, and the upper surface is the surface layer S of the left bridge body 2 and the right bridge body 3. And a joint rubber 4 in which a continuous flat surface 4a can be deformed without any gaps, and a frame 5 made of a hard material that supports the joint rubber 4 is installed immediately below the joint rubber 4. .

  The bridge joint structure according to claim 3 is a bridge constructed on a river, a lake, or the ground, and is formed between end faces where the gap between the adjacent left bridge body 2 and the right bridge body 3 changes. The upper bridge U is always densely disposed in the upper gap U formed between the end surfaces of the left bridge body 2 and the right bridge body 3, and the upper end surface is a surface layer S of the left bridge body 2 and the right bridge body 3. A deformable joint rubber 4 is provided which is a flat surface 4a which is flush with a flat surface and is a concave surface 4b.

  Further, it is formed to communicate with the lower surface of the upper bridge U between the end surfaces of the left bridge body 2 and the right bridge body 3 and is disposed in an intermediate gap M wider than the upper gap U. A convex surface 5a in contact with the concave surface 4b of the rubber 4 is provided with a hard piece 5 having a left inclined surface 5b on the left side of the lower end surface and a right inclined surface 5c on the right side.

  Furthermore, a left claw portion 2a that protrudes rightward from the lower end portion of the left end surface of the left bridge body 2 and has a left abutment surface 2b that abuts the right inclined surface 5c of the top 5 on the upper surface of the right end portion, and the right bridge. A right claw portion 3a that protrudes from the lower end portion of the end surface of the body 3 to the left and intersects with the left claw portion 2a, and has a right abutment surface 3b that abuts the left inclined surface of the top 5 on the upper surface of the left end portion. And comprising.

  Then, the frame 5 is moved up and down by the separation of the left contact surface 2b and the right contact surface 3b due to the expansion and contraction of the left bridge body 2 and the right bridge body 3 due to temperature change, and thereby the left bridge body 2 The joint rubber 4 whose left and right width and wall thickness change with the expansion and contraction of the right bridge body 3 is moved up and down, and the flat surface 4a of the joint rubber 4 and the surface layer S of the left bridge body 2 and the right bridge body 3 are moved. To maintain the same level.

  The bridge joint structure according to claim 4 is a bridge constructed on a river, a lake, or on the ground, in a joint 1 formed between end faces where the gap between the adjacent left bridge body 2 and the right bridge body 3 changes. The upper bridge U is always densely disposed in the upper gap U formed between the end surfaces of the left bridge body 2 and the right bridge body 3, and the upper end surface is a surface layer S of the left bridge body 2 and the right bridge body 3. A deformable joint rubber 4 is provided which is a flat surface 4a which is flush with a flat surface and is a concave surface 4b.

  Further, it is formed to communicate with the lower surface of the upper bridge U between the end surfaces of the left bridge body 2 and the right bridge body 3 and is disposed in an intermediate gap M wider than the upper gap U. A convex surface 5a in contact with the concave surface 4b of the rubber 4 is provided with a hard piece 5 having a left inclined surface 5b on the left side of the lower end surface and a right inclined surface 5c on the right side.

  Furthermore, a left claw portion 2a that protrudes rightward from the lower end portion of the left end surface of the left bridge body 2 and has a left abutment surface 2b that abuts the right inclined surface 5c of the top 5 on the upper surface of the right end portion, and the right bridge. A right claw portion 3a that protrudes from the lower end portion of the end surface of the body 3 to the left and intersects with the left claw portion 2a, and has a right abutment surface 3b that abuts the left inclined surface of the top 5 on the upper surface of the left end portion. And comprising.

  Then, the frame 5 is moved up and down by the separation of the left contact surface 2b and the right contact surface 3b due to the expansion and contraction of the left bridge body 2 and the right bridge body 3 due to temperature change, and thereby the left bridge body 2 The joint rubber 4 whose left and right width and wall thickness change with the expansion and contraction of the right bridge body 3 is moved up and down, and the flat surface 4a of the joint rubber 4 and the surface layer surface S of the left bridge body 2 and the right bridge body 3 are moved. And a hollow portion 4 c is formed in the joint rubber 4.

  The bridge joint structure according to claim 5 is a bridge constructed on a river, a lake, or the ground, and is formed of a joint 1 formed between end faces where the gap between the adjacent left bridge body 2 and the right bridge body 3 changes. The upper bridge U is always densely disposed in the upper gap U formed between the end surfaces of the left bridge body 2 and the right bridge body 3, and the upper end surface is a surface layer S of the left bridge body 2 and the right bridge body 3. There is provided a joint rubber 4 having a flat surface 4a which is flush with a concave surface 4b at the lower end surface.

  Further, it is formed to communicate with the lower surface of the upper bridge U between the end surfaces of the left bridge body 2 and the right bridge body 3 and is disposed in an intermediate gap M wider than the upper gap U. A convex surface 5a in contact with the concave surface 4b of the rubber 4 is provided with a hard piece 5 having a left inclined surface 5b on the left side of the lower end surface and a right inclined surface 5c on the right side.

  Furthermore, a left claw portion 2a that protrudes rightward from the lower end portion of the left end surface of the left bridge body 2 and has a left abutment surface 2b that abuts the right inclined surface 5c of the top 5 on the upper surface of the right end portion, and the right bridge. A right claw portion 3a that protrudes from the lower end portion of the end surface of the body 3 to the left and intersects with the left claw portion 2a, and has a right abutment surface 3b that abuts the left inclined surface of the top 5 on the upper surface of the left end portion. And comprising.

  Then, the frame 5 is moved up and down by the separation of the left contact surface 2b and the right contact surface 3b due to the expansion and contraction of the left bridge body 2 and the right bridge body 3 due to temperature change, and thereby the left bridge body 2 The joint rubber 4 whose left and right width and wall thickness change with the expansion and contraction of the right bridge body 3 is moved up and down, and the flat surface 4a of the joint rubber 4 and the surface layer surface S of the left bridge body 2 and the right bridge body 3 are moved. The joint rubber 4 is formed with a hollow portion 4c, and the hollow portion 4c is filled with the semi-vulcanized rubber R.

  The bridge joint structure according to claim 1 is a joint for mutual contact between the left contact surface 2b and the right contact surface 3b due to expansion and contraction of the left bridge body 2 and the right bridge body 3 due to temperature changes such as summer and winter. Since the flat surface 4a of the rubber 4 and the surface layer surface S of the left bridge body 2 and the right bridge body 3 are kept flush with each other, it solves the problem that the expansion and contraction function of the joint portion 1 deteriorates due to sand entering the opening recess. can do. Moreover, the maintenance which removes the sand which entered the opening recessed part becomes unnecessary, and traffic congestion is not caused. Furthermore, since unevenness is not formed on the road surface, noise due to vehicle passage can be suppressed.

  In the bridge joint structure according to claim 2, the frame 5 is formed by mutual separation of the left abutment surface 2b and the right abutment surface 3b due to expansion and contraction of the left bridge body 2 and the right bridge body 3 due to temperature changes such as summer and winter. By moving up and down, the joint rubber 4 whose left and right width and wall thickness change with the expansion and contraction of the left bridge body 2 and the right bridge body 3 is moved up and down. By doing so, the flat surface 4a of the joint rubber 4 and the surface layer surface S of the left bridge body 2 and the right bridge body 3 are maintained flush with each other. It is possible to solve the problem of lowering. Moreover, the maintenance which removes the sand which entered the opening recessed part becomes unnecessary, and traffic congestion is not caused. Furthermore, since unevenness is not formed on the road surface, noise due to vehicle passage can be suppressed.

  The bridge joint structure according to claim 3 is configured such that the top 5 is formed by mutual separation of the left abutment surface 2b and the right abutment surface 3b due to expansion and contraction of the left bridge body 2 and the right bridge body 3 due to temperature changes such as summer and winter. By moving up and down, the joint rubber 4 whose left and right width and wall thickness change with the expansion and contraction of the left bridge body 2 and the right bridge body 3 is moved up and down. By doing so, the flat surface 4a of the joint rubber 4 and the surface layer surface S of the left bridge body 2 and the right bridge body 3 are maintained flush with each other. No opening recess is formed in the flat surface 4a portion).

  Therefore, it is possible to solve the problem that sand or the like enters the opening recess and the expansion / contraction function of the joint 1 is lowered. Moreover, the maintenance which removes the sand which entered the opening recessed part becomes unnecessary, and traffic congestion is not caused. Furthermore, since unevenness is not formed on the road surface, noise due to vehicle passage can be suppressed.

  Further, in this bridge joint structure, the flat surface 4a of the joint rubber 4 is exposed, and asphalt is not laid thereon as in the prior art. Therefore, it is possible to solve the problem that the road surface is cracked.

  The bridge joint structure according to claim 4 exhibits the same effect as the invention according to claim 1. In addition, since the hollow portion 4c is formed in the joint rubber 4, the elasticity of the joint rubber 4 can be increased, and even if the left bridge body 2 and the right bridge body 3 are severely expanded or contracted due to a large temperature change, both The upper gap U can be reliably filled. As a result, the formation of the opening recess can be more reliably prevented.

  The bridge joint structure according to claim 5 also exhibits the same effect as that of the invention according to claim 1. Moreover, since the hollow part 4c is formed in the joint rubber 4 and the hollow part 4c is filled with the semi-vulcanized rubber R, the elasticity of the joint rubber 4 is enhanced by the excellent viscosity of the semi-vulcanized rubber R. Can be increased. Further, by filling the semi-vulcanized rubber R into the hollow portion 4c, the mechanical strength of the joint rubber 4 can be increased as compared with a case where the hollow rubber 4c is not filled.

It is a top view which shows the junction part of a bridge. FIG. 9 is a cross-sectional view taken along the line P-P in FIG. 1, showing a joint portion according to a conventional example. It is the PP sectional view taken on the line of FIG. 1 which shows the junction part which concerns on another prior art example. 1 shows a joint structure according to the present invention and is a cross-sectional view taken along the line P-P in FIG. 1 (structure in summer). 1 shows a joint structure according to the present invention and is a cross-sectional view taken along the line P-P in FIG. 1 (structure in winter). FIG. 6 is an exploded cross-sectional view of the joint structure shown in FIGS. 4 and 5. FIG. 7 shows the left bridge body and the right bridge body in FIG. 6, and is a view (bottom view) taken along the arrow Q in FIG. 6. It is explanatory drawing which shows the relationship between the expansion area and compensation area in this invention. It is a figure for demonstrating the inclination-angle of the left inclined surface and right inclined surface of the top in this invention. It is a graph which shows the relationship between the movement length in this invention, and compensation length.

  A first embodiment of a bridge joint structure according to the present invention is shown in FIGS. 1 and 4 to 7. This is a structure of the joint 1 formed between the end faces where the gap between the adjacent left bridge body 2 and the right bridge body 3 changes in a bridge built on a river, a lake, or the ground, and is deformable joint rubber. 4, frame 5, left claw portion and right claw portion.

  The joint rubber 4 is always arranged densely in the upper gap U formed at the upper part between the end surfaces of the left bridge body 2 and the right bridge body 3, and the upper end surfaces thereof are the surfaces of the left bridge body 2 and the right bridge body 3. It is exposed on the road surface as a continuous flat surface 4a which is flush with the layer surface S and has no gap. The lower end surface is a concave surface 4b. Furthermore, a plurality of parallel horizontal through-hole-shaped hollow portions 4c are formed inside.

  The joint rubber 4 can be formed of a synthetic rubber material such as SBR, BR, EPDM, or a solid rubber made of a natural rubber material. Moreover, the hardness of the said joint rubber 4 can use a 30-90 degree thing, and a 45-70 degree thing is suitable in it. Furthermore, the joint rubber 4 can be increased in rigidity by adding a reinforcing agent such as carbon black, if necessary.

  The top 5 is disposed between the end surfaces of the left bridge body 2 and the right bridge body 3 in an intermediate gap M that is formed directly below the upper gap U and communicates with the upper gap U and is wider than the upper gap U. is doing. The top surface of the frame 5 is a convex surface 5 a that is in contact with the concave surface 4 b of the joint rubber 4. Further, a left inclined surface 5b is formed on the left side of the lower end surface, and a right inclined surface 5c is formed on the right side of the lower end surface. The top 5 is made of a hard material such as metal or hard plastic.

  The left claw portion 2a protrudes continuously in the right direction from the lower end portion of the end surface of the left bridge body 2, and forms a left contact surface 2b that contacts the right inclined surface 5c of the top 5 on the upper surface of the right end portion. The left contact surface 2b has a gradient equal to the right inclined surface 5c of the top 5.

  The right claw portion 3b protrudes continuously from the lower end portion of the end face of the right bridge body 3 in the left direction so as to intersect with the left claw portion 2a, and the right abutment that abuts the left inclined surface of the top 5 on the upper surface of the left end portion. The contact surface 3b is formed. The right contact surface 3b and the left inclined surface 5b of the top 5 are set to have the same gradient. For example, as shown in FIG. 7, a pair of the left claw portions 2a is provided via the insertion space G and the right claw portion 3a is inserted into the insertion space G. Can be done.

  As a result, when the left bridge body 2 and the right bridge body 3 expand and contract due to temperature changes, the left contact surface 2b and the right contact surface 3b move away from each other or approach each other to increase or decrease the distance between them. The frame 5 is moved up or down. Thereby, the joint rubber 4 is moved up and down, and the flat surface 4a of the joint rubber 4 and the surface layer surface S of the left bridge body 2 and the right bridge body 3 are maintained flush with each other.

  For example, in the winter season, the joint rubber 4 extends in the left-right direction corresponding to the upper gap U that increases as the left bridge body 2 and the right bridge body 3 contract, and the thickness thereof decreases. At this time, the left claw portion 2a and the right claw portion 3a approach each other due to the contraction of the left bridge body 2 and the right bridge body 3, and the frame 5 is moved upward by the left abutment surface 2b and the right abutment surface 3b. As a result, the joint rubber 4 whose thickness is reduced is moved upward. As a result, the flat surface 4a of the joint rubber 4 can be kept flush with the surface layer S of the left bridge body 2 and the right bridge body 3 without descending.

  As a result, no opening recess is formed in the flat surface 4a of the joint rubber 4, and sand or the like does not enter. Therefore, it is possible to prevent a situation in which the expansion / contraction function of the joint portion 1 is lowered, and it is not necessary to perform maintenance such as removing sand. This does not cause traffic congestion. In addition, since asphalt is not laid on the joint rubber 4 in a state of being continuous from the left bridge body 2 and the right bridge body 3, the road surface is cracked even if the left bridge body 2 and the right bridge body 3 expand and contract due to temperature changes. The situation that occurs does not occur.

  In addition, since the joint rubber 4 in this embodiment forms the hollow part 4c in which several cross sections are circular or square shape (diamond) in the inside, the elasticity of the said joint rubber 4 can be improved, and big temperature Even if the width of the upper gap U changes greatly due to the change, it can be easily followed. Accordingly, it is possible to more reliably prevent the opening recess from being formed immediately above the joint rubber 4. In FIG. 5, three hollow portions 4 c are provided between the left bridge body 2 and the right bridge body 3.

  Moreover, while the hollow part 4c of the joint rubber 4 can be filled with the semi-vulcanized rubber R, by doing so, the elasticity of the joint rubber 4 is enhanced by the high viscosity of the semi-vulcanized rubber R, and The mechanical strength can be improved by filling the hollow portion 4c.

Note that the inclination angles of the left abutment surface 2b of the left claw portion 2a, the right abutment surface 3b of the right claw portion 3a, the left inclined surface 5b of the top 5 and the right inclined surface 5c are set by the equation y = bx / (a + x). can do. That is, as shown in FIG. 8, when the left and right width of the joint rubber 4 extends from a to x, the thickness becomes y (here, the joint rubber 4 is considered to have a constant volume even if it expands and contracts). When the joint rubber 4 contracts, the area S _{1 that} is expanded by the joint rubber 4 is obtained by the equation (1). Further, the compensation area S ₂ required with it is determined by equation (2).

S ₁ = bx−0.5xy (1)
S ₂ = ay + 0.5xy (2)

  Here, since (1) and (2) are equal, y = bx / (a + x) from both equations. Thereby, as shown in FIG. 9, the inclination angles of the left inclined surface 5b and the right inclined surface 5c of the top 5 can be set. In the present embodiment, the inclination angle of the left contact surface 2b of the left bridge body 2 is set equal to the right inclination surface 5c, and the inclination angle of the right contact surface 3b is set equal to the left inclination surface 5b (these All inclination angles are set equal).

Table 1 shows the numerical values when a = 10 cm and b = 5 cm (y1) and when a = 10 cm and b = 10 cm (y2). FIG. 10 shows the graph. The approximate value line of y ₁ and y ₂ in FIG. 10 may be an approximate line (zero point is moving) made by applying the least square method to the linear equation, and because it is gentle, the rubber shrinks in winter. Since it expands in summer, it may be a straight line as in the approximate expression shown in FIG.

DESCRIPTION OF SYMBOLS 1 Joint part 2 Left bridge body 2a Left claw part 2b Left contact surface 3 Right bridge body 3a Right claw part 3b Right contact surface 4 Joint rubber 4a Flat surface 4b Concave surface 4c Hollow part 5 Top 5a Convex surface 5b Left inclined surface 5c Right inclined surface 10 Joint 11 Left bridge body 12 Right bridge body 13 Joint rubber 14 Opening recess 15 Stretching device 16 Rubber material 17 Asphalt G Insertion space M Middle part gap R Semi-vulcanized rubber S Surface layer U Upper gap

JP-A-3-290505

Claims (5)

  In a bridge constructed on a river, a lake, or the ground, it is a joint structure formed between end faces where the gap between the adjacent left bridge body (2) and the right bridge body (3) changes, and the left bridge body and It is always densely arranged in the upper gap (U) formed at the upper part between the end faces of the right bridge body, and the upper end surface is flush with the surface layer (S) of the left bridge body and the right bridge body and is continuous and flat. Bridge joint structure characterized in that the surface (4a) comprises a deformable joint rubber (4).   In a bridge constructed on a river, a lake, or the ground, it is a joint structure formed between end faces where the gap between the adjacent left bridge body (2) and the right bridge body (3) changes, and the left bridge body and It is always densely arranged in the upper gap (U) formed at the upper part between the end faces of the right bridge body, and the upper end surface is flush with the surface layer (S) of the left bridge body and the right bridge body and is continuous and flat. The surface 4a is provided with a deformable joint rubber (4), and a hard-made piece (5) for supporting the joint rubber (4) is provided immediately below the joint rubber (4). Bridge joint structure.   In a bridge constructed on a river, a lake, or the ground, it is a joint structure formed between end faces where the gap between the adjacent left bridge body (2) and the right bridge body (3) changes, and the left bridge body and It is always densely arranged in the upper gap (U) formed at the upper part between the end faces of the right bridge body, and the upper end surface is flush with the surface layer (S) of the left bridge body and the right bridge body and is continuous and flat. A deformable joint rubber 4 whose lower end surface is a concave surface (4b) at the surface (4a) and formed between the left bridge body and the end surface of the right bridge body, directly below the upper gap, Located in the middle gap (M) wider than the upper gap, the upper end surface is a convex surface (5a) in contact with the concave surface of the joint rubber, has a left inclined surface (5b) on the left side of the lower end surface, and on the right side A hard piece (5) having a right inclined surface (5c) and an end of the left bridge body; A left claw portion (2a) that protrudes rightward from the lower end portion and has a left abutment surface (2b) that abuts on the right inclined surface of the top on the upper surface of the right end portion, and left from the lower end portion of the end surface of the right bridge body A right claw portion (3a) having a right abutment surface (3b) that protrudes in a direction and intersecting with the left claw portion and that abuts the left inclined surface of the top on the upper surface of the left end portion, The frame is moved up and down by mutual separation of the left contact surface and the right contact surface due to expansion and contraction of the left bridge body and the right bridge body due to a change, and thereby along with expansion and contraction of the left bridge body and the right bridge body A bridge joint characterized by supporting a lower end surface of the joint rubber whose left-right width and wall thickness change, and maintaining the upper end surface of the joint rubber and the surface layer surfaces of the left bridge body and the right bridge body flush with each other Part structure.   In a bridge constructed on a river, a lake, or the ground, it is a joint structure formed between end faces where the gap between the adjacent left bridge body (2) and the right bridge body (3) changes, and the left bridge body and It is always densely arranged in the upper gap (U) formed at the upper part between the end faces of the right bridge body, and the upper end surface is flush with the surface layer (S) of the left bridge body and the right bridge body and is continuous and flat. A deformable joint rubber (4) whose lower end surface is a concave surface (4b) and a surface (4a), and the end surface of the left bridge body and the right bridge body are formed to communicate directly under the upper gap. The upper surface is a convex surface (5a) in contact with the concave surface of the joint rubber, and has a left inclined surface (5b) on the left side of the lower surface, A hard piece (5) having a right inclined surface (5c) and an end of the left bridge body; A left claw portion (2a) that protrudes rightward from the lower end portion and has a left abutment surface (2b) that abuts on the right inclined surface of the top on the upper surface of the right end portion, and left from the lower end portion of the end surface of the right bridge body A right claw portion (3a) having a right abutment surface (3b) that protrudes in a direction and intersecting with the left claw portion and that abuts the left inclined surface of the top on the upper surface of the left end portion, The frame is moved up and down by mutual separation of the left contact surface and the right contact surface due to expansion and contraction of the left bridge body and the right bridge body due to a change, and thereby along with expansion and contraction of the left bridge body and the right bridge body The joint rubber is configured to support a lower end surface of the joint rubber whose left-right width and wall thickness change, and to maintain the upper end surface of the joint rubber and the surface layer surfaces of the left bridge body and the right bridge body flush with each other. A bridge characterized in that a hollow part (4c) is formed in Junction structure.   In a bridge constructed on a river, a lake, or the ground, it is a joint structure formed between end faces where the gap between the adjacent left bridge body (2) and the right bridge body (3) changes, and the left bridge body and It is always densely arranged in the upper gap (U) formed at the upper part between the end faces of the right bridge body, and the upper end surface is flush with the surface layer (S) of the left bridge body and the right bridge body and is continuous and flat. A deformable joint rubber (4) whose lower end surface is a concave surface (4b) and a surface (4a), and the end surface of the left bridge body and the right bridge body are formed to communicate directly under the upper gap. , Disposed in the middle gap (M) wider than the upper gap, the upper end surface is a convex surface (5a) in contact with the concave surface of the joint rubber, and has a left inclined surface (5b) on the left side of the lower end surface, Hard frame top (5) having a right inclined surface (5c) on the right side and the left bridge body A left claw portion (2a) that protrudes rightward from the lower end portion of the end surface and has a left abutting surface (2b) that abuts on the right inclined surface of the top on the upper surface of the right end portion, and from the lower end portion of the end surface of the right bridge body A right claw portion (3a) that protrudes in the left direction so as to intersect with the left claw portion and has a right abutment surface (3b) that abuts on the left inclined surface of the top on the upper surface of the left end portion; The frame is moved up and down by mutual contact of the left contact surface and the right contact surface due to the expansion and contraction of the left bridge body and the right bridge body due to a temperature change, thereby accompanying the expansion and contraction of the left bridge body and the right bridge body And supporting the lower end surface of the joint rubber whose left-right width and wall thickness change, and maintaining the upper end surface of the joint rubber and the surface layer surfaces of the left bridge body and the right bridge body flush with each other. A hollow part (4c) is formed in the rubber, and the hollow part is half-heated Bridge junction structure, characterized in that filled with rubber (R).

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