JP5572174B2 - Modular bridge expansion and contraction device - Google Patents

Description

  The present invention relates to a modular bridge expansion and contraction device for connecting between beams of a road bridge composed of a plurality of girders, and in particular, smoothly and horizontally moves a support beam to reduce impact and noise. The present invention relates to a telescopic device for a modular bridge.

As disclosed in Patent Document 1, the present applicant has already filed an application for a modular bridge expansion / contraction device for connecting the bridges of a road bridge composed of a plurality of girders. Will be described with reference to FIGS.
As shown in FIGS. 12 and 13, the road bridge telescopic device 1 described in Patent Document 1 has a left end plate beam 4A on the end wall of the left girder 2 of the left and right girder 2 and 3 facing each other. The right end plate beam 4B is attached to the end wall of the right girder 3, and an appropriate number of cell plate beams 4C, parallel to the left and right end plate beams 4A, 4B, are provided between the left and right end plate beams 4A, 4B. 4C ... are arranged.

Further, as shown in FIG. 13, the road bridge telescopic device 1 passes through the cut-out holes 5, 5 ... opened in the left and right end plate beams 4A, 4B and an appropriate number of cell plate beams 4C, 4C .... As shown in FIG. 14, an appropriate number of support beams 7, 7... Are slidably arranged perpendicular to the longitudinal direction of the left and right end plate beams 4A, 4B and an appropriate number of cell plate beams 4C, 4C. Has been.
In the lower portions of both ends of the support beam 7, the left and right end plate beams 4A, 4B are cut out from the cutout holes 5, 5 ... in order to prevent the left and right end plate beams 4A, 4B from falling out of the cutout holes 5, 5 .... In order to engage with the vicinity, protruding pins 6 and 6 shown in FIG. 15 are formed protruding downward.

As shown in FIG. 13, the road bridge telescopic device 1 includes plate beams (left and right end plate beams 4A, 4B, 4B, 4B,...) That are adjacent to each other of right and left end plate beams 4A, 4B and an appropriate number of cell plate beams 4C, 4C. 4B and the cell plate beam 4C are commonly referred to as plate beams.) A plurality of three-stage reaction forces are generated in the vicinity of the front and rear of the support beam 7 between them to urge adjacent plate beams away from each other. The reaction force three-stage springs 8, 8,.
As shown in FIG. 12, the left and right end plate beams 4A, 4B and an appropriate number of cell plate beams 4C, 4C,... Seal rubbers 9, 9... Are arranged and are configured to seal between the upper ends of the plate beams adjacent to each other.

Further, the cut-out holes 5, 5 ... of the left and right end plate beams 4A, 4B are provided with boxes 10, 10 ... on the side of the spar end walls of the cut-out holes 5, 5 ... in order to prevent inflow of concrete and accessories. The girder end wall side of the cut-out holes 5, 5. The boxes 10, 10... Are fixed to the anchor bars 11 installed on the left and right end plate beams 4A, 4B.
In FIG. 13, reference numeral 12 denotes a sliding plate disposed on the upper surface of the lower end of the cut-out holes 5, 5... Of the left and right end plate beams 4A, 4B or the upper surface of the cut-out hole 5 of the cell plate beam 4C. .

In FIG. 12, both ends of the seal rubber 9 are positioned at the upper end positions on the adjacent sides of the plate beams 4, 4 ... adjacent to each other of the left and right end plate beams 4A, 4B and an appropriate number of cell plate beams 4C, 4C ... Are formed in the longitudinal direction of the plate beams 4, 4..., Respectively. On the other hand, the seal rubber 9 is fitted with cut-out portions 14 for fitting into the cut-out grooves 13, 13 at both ends. , 14 extend in the longitudinal direction of the seal rubber 9.
As shown in FIG. 15, the support beam 7 includes upper and lower load supporting beams 15 and 16 and a displacement pressure lead rubber layer 17 attached between them.

JP-A-11-200310

The road bridge telescopic device of Patent Document 1 can reduce the impact and noise when the wheels of an automobile pass through the road bridge telescopic device, as well as the bridge axis direction at the end of the road bridge and the direction perpendicular to the bridge axis. It is possible to absorb the displacement of the end of the girder by moving to.
However, the extension device for the road bridge has a problem in that impact and noise are generated between the support plate and the sliding plate disposed on the upper surface of the lower end or the lower surface of the upper end of the left and right end plate beam and cell plate beam. was there.
Moreover, there is a possibility that the seal rubber may fall out of the notch groove of the plate beam due to the pressure of earth and sand or snow and ice, and the solution has been desired.

In view of the above situation, an object of the present invention is to provide a modular bridge expansion / contraction device capable of smoothly performing horizontal movement and rotational movement of a support beam to reduce impact and noise.
It is another object of the present invention to provide a modular bridge expansion / contraction device that prevents the seal rubber from falling off the plate beam.

In order to solve the above problems, the present invention provides the following configurations.
The invention according to claim 1 of the present invention is a modular bridge expansion and contraction device for connecting between bridge bridge girders composed of a plurality of girders.
A left end plate beam attached to the wall of the left girder of the left and right girder facing each other;
A right end plate beam attached to the girder wall of the right girder,
An appropriate number of cell plate beams arranged in parallel with the left and right end plate beams between the left and right end plate beams;
The left and right end plate beams and the appropriate number of cell plate beams are pierced through the cutout holes and slidable perpendicularly to the longitudinal direction of the left and right end plate beams and the appropriate number of cell plate beams. In order to prevent the left and right end plate beams from coming off from the respective cutout holes, projecting pins are formed at the lower ends of both ends in order to engage with the vicinity of the cutout holes of the left and right end plate beams. With the appropriate number of support beams,
The left and right end plate beams and the appropriate number of cell plate beams are respectively arranged in the vicinity of the front and rear of the support beam between the adjacent plate beams, and urge the adjacent plate beams in a direction away from each other. A plurality of reaction force three-stage springs that generate a three-stage reaction force;
The left and right end plate beams and the appropriate number of cell plate beams are disposed between the upper ends of the plate beams adjacent to each other so as to extend in the longitudinal direction of the plate beams, and seal between the upper ends of the plate beams adjacent to each other. A plurality of seal rubbers,
The left and right end plate beam cutout holes are provided with a box having anchor bolts on the side of the girder end wall of the cutout hole to prevent inflow of concrete or an attachment, and the girder end wall of the cutout hole. A modular bridge expansion and contraction device surrounded by a side,
A base plate in which one surface is fixed to the upper inner wall surface or lower inner wall surface of the cutout hole and a plurality of disk-shaped protrusions are formed on the other surface, and one protrusion of the base plate is inserted on one surface A plurality of rubber plate-shaped body rubbers that are rotatable around the protrusions, and a side plate having a predetermined width that is orthogonal to both side surfaces are fixed to each other, and one side and both side plates are formed. A soundproof shock buffer having a main body rubber in the groove portion and a sliding plate that slidably holds one surface of the support beam and both side surfaces in the vicinity thereof in the other groove portion formed by the other surface and both side plates. A modular bridge expansion / contraction device is provided, wherein the device is arranged by fixing one surface of the base plate to an upper inner wall surface and a lower inner wall surface of the cutout hole.

According to a second aspect of the present invention, both ends of the sealing rubber are fitted at positions below a predetermined dimension from upper ends of adjacent plate beams adjacent to each other of the right and left end plate beams and the appropriate number of cell plate beams. Notch grooves to be joined are respectively formed in the longitudinal direction of the plate beam,
The notch groove is formed with an engagement portion having a wider groove width in the inner back part,
On the other hand, the both sides of the seal rubber are inserted into the notch groove, and an insertion part for engaging with the engagement part of the notch groove extends in the longitudinal direction of the seal rubber,
The fitting portion is configured such that a locking portion having a wide width is formed at a distal end portion, and the locking portion is locked to the engaging portion,
Further, the insertion portion opens on the exposed surface side when the insertion portion is inserted into the notch groove, and a wedge-shaped groove portion having a wide groove width in a sectional view wedge shape is formed in the inner back portion. A next insertion groove is formed extending in the longitudinal direction of the seal rubber;
On the other hand, in order to engage with the wedge-shaped groove portion, a wedge-shaped tip portion having a wider width in a sectional view wedge shape is formed at the tip portion, and the wedge-shaped rubber formed with higher hardness than the seal rubber is It is provided so that it can be inserted freely over the entire length of the secondary insertion groove,
When the wedge-type rubber is inserted into the secondary insertion groove of the seal rubber, the wedge-type tip portion of the wedge-type rubber is inserted into the wedge-type groove portion of the secondary insertion groove, whereby the seal rubber insertion portion Is pressed against the notch groove of the plate beam to prevent the seal rubber fitting portion from falling off the notch groove, and the wedge-shaped tip portion of the wedge-shaped rubber is a wedge-shaped groove portion of the secondary insertion groove. The modular bridge expansion and contraction device according to claim 1, wherein the wedge-shaped rubber is configured to prevent the wedge-shaped rubber from falling from the secondary insertion groove.

According to the present invention, it is possible to smoothly perform horizontal movement and rotational movement of the support beam, thereby reducing impact and noise.
Further, it is possible to provide a modular bridge expansion / contraction device that prevents the seal rubber from falling off the plate beam.

It is a front longitudinal cross-sectional view of the expansion device for modular bridges concerning one Example of this invention. 1 is a perspective view of a modular bridge telescopic device according to an embodiment of the present invention. (A) It is a front view of reaction force 3 step | paragraph spring. (B)-(c) It is a front view explaining the change of a reaction force 3 step | paragraph spring. (A) It is a front view of a vertical soundproof shock absorber. (B) It is a top view of a soundproofing shock absorber. (C) It is a side view of a vertical soundproof shock absorber. (A) It is a front view explaining the assembly method of a soundproof shock absorber. (B) It is a side view explaining the assembly method of a soundproof shock absorber. (A) The lower figure is a front view of the base plate, the upper figure is a plan view of the base plate, the upper right figure is a perspective view of the base plate, and the lower right figure is a side view of the base plate. (B) The lower figure is a front view of the main rubber, the upper figure is a plan view of the main rubber, the upper right figure is a perspective view of the main rubber, and the lower right figure is a side view of the main rubber. (C) The lower drawing is a front view of the sliding plate, the upper drawing is a plan view of the sliding plate, the upper right drawing is a perspective view of the sliding plate, and the lower right drawing is a side view of the sliding plate. (A) It is a top view which shows the state of the sound-proof shock-absorbing device of a modular type expansion-contraction apparatus for bridges, and a support beam at the time of normal bridge girder. (B) It is a top view which shows the state of the sound-proof impact buffering device and support beam of the expansion device for modular type bridges at the time of bridge girder extension. (C) It is a top view which shows the state of the sound-proof shock-absorbing device of a modular bridge expansion-contraction apparatus at the time of bridge girder contraction, and a support beam. (D)-(e) It is a top view which shows the state of the sound-proof shock-absorbing device of a modular bridge expansion-contraction apparatus when a support beam rotates, and a support beam. It is a partially expanded front longitudinal cross-sectional view of the plate beam and seal rubber which concern on one Example of this invention. It is a front view of the seal rubber and wedge type rubber concerning one example of the present invention. (A) It is a disassembled perspective view of seal rubber and wedge type rubber. (B) It is a perspective view which shows the state which inserted the wedge-shaped rubber in the seal rubber. (A) It is a perspective view which shows the example of a connection of the longitudinal direction of a right-and-left end plate beam. (B) It is a perspective view which shows the example of a connection of the longitudinal direction of a cell plate beam. (C) It is a perspective view which shows the other connection example of the longitudinal direction of a cell plate beam. It is a front longitudinal cross-sectional view of the expansion device for road bridges of patent document 1. FIG. It is a perspective view of the expansion device for road bridges of patent documents 1. It is AA sectional view taken on the line of the previous FIG. (A) It is a front view of a support beam. (B) It is a top view of a support beam. (C) It is a side view of a support beam. (D) It is a perspective view of a support beam.

Hereinafter, embodiments of the present invention will be described with reference to the drawings showing examples.
The expandable device for a modular bridge according to the present invention is the same as the expandable device for a road bridge (1 in FIG. 12) of the above-mentioned Patent Document 1, particularly the cutout hole (5 in FIG. 13). The sliding plate (12 in FIG. 13), the seal rubber (14 in FIG. 12), the left and right end plate beams (4A, 4B in FIG. 12), and the cell plate beam (in FIG. 12) 4C) and the notch groove (13 in FIG. 12). Therefore, for convenience of explanation, the same components as those in the conventional example are denoted by the same reference numerals and the description thereof is omitted.

  1 and 2, reference numeral 31 denotes a modular bridge expansion / contraction device of the present invention for connecting one digit of a road bridge composed of a plurality of girders. As with the road bridge telescopic device (1 in FIG. 12), it is attached to the end wall of the left girder 2 of the left and right girder (left and right girder in FIG. 1) 2 and 3 facing each other. The left end plate beam 4A, the right end plate beam 4B attached to the end wall of the right girder 3, and the left and right end plate beams 4A and 4B are disposed in parallel with the left and right end plate beams 4A and 4B. A suitable number of cell plate beams 4C, 4C.

The modular bridge telescopic device 31 passes through the left and right end plate beams 4A, 4B and the appropriate number of cell plate beams 4C, 4C,. A proper number of support beams 7, 7... That are slidably arranged perpendicularly to the longitudinal direction of 4A, 4B and a proper number of cell plate beams 4C, 4C.
The cut-out holes 5, 5 ... of the left and right end plate beams 4A, 4B are provided with boxes 10, 10 ... on the side of the spar end walls of the cut-out holes 5, 5 ... in order to prevent the inflow of concrete and accessories. Thus, the side walls of the cutout holes 5, 5... Are surrounded. The boxes 10, 10... Are fixed to the anchor bars 11 installed on the left and right end plate beams 4A, 4B.

  Further, as shown in FIGS. 1 and 2, the modular bridge telescopic device 31 is provided between the plate beams 4 and 4 adjacent to each other of the right and left end plate beams 4A and 4B and an appropriate number of cell plate beams 4C, 4C. A plurality of reaction force three-stage springs 8, 8... That generate three-stage reaction forces are arranged in the vicinity of the front and rear of the support beam 7 to urge the adjacent plate beams 4, 4 in directions away from each other. Are arranged in the longitudinal direction of the plate beams 4, 4 ... between the upper ends of the plate beams 4, 4 adjacent to each other of the right and left end plate beams 4A, 4B and an appropriate number of cell plate beams 4C, 4C ... A plurality of seal rubbers 32, 32, which will be described later, are provided to improve the seal rubber (9 in FIG. 12) for sealing between the upper ends of the plate beams 4, 4 adjacent to each other.

  FIG. 3A shows the reaction force three-stage spring 8. The reaction force three-stage spring 8 includes a spring portion A having a weak rebound strength divided into three steps and a spring portion having a medium rebound strength. B and a spring portion C having a strong resilience strength are continuously integrated. Therefore, when the reaction force three-stage spring is compressed, as shown in FIGS. 3B and 3C, first, the spring portion A having a weak repulsion strength mainly works, and in turn, the medium repulsion strength. The spring part B having the above and the spring part C having a strong rebound strength mainly work. Therefore, by utilizing the elastic reaction force of the spring divided into three stages, an appropriate number of cell plate beams 4C, 4C,... The mutual expansion and contraction of the seal rubbers 32, 32. In addition, it is possible to maintain a superficial aesthetic by keeping the mutual distance uniform. Further, the reaction force three-stage spring 8 has a reliable restoring force against a large earthquake shake or large deformation. By providing the reaction force three-stage spring 8, the service life is extended, and the cell adjustment period can be extended.

  4 to 6, reference numeral 33 denotes a soundproof shock absorbing device of the present invention used in place of the sliding plate (12 in FIG. 13) of the road bridge telescopic device (1 in FIG. 13). The soundproof shock absorbing device 33 is fixed to the upper inner wall surface (upper lower surface) and the lower inner wall surface (lower upper surface) of the cutout hole 5 in the same manner as the sliding plate (12 in FIG. 13). A base plate 35 made of a rolled structural steel material or the like, one surface of which is fixed to the upper inner wall surface or the lower inner wall surface of the cutout hole 5 and a plurality of disk-shaped protrusions 34, 34. An insertion hole 36 for inserting one protrusion 34 of the base plate 35 is formed on one surface, and a plurality of main body rubber 37 made of chloroprene rubber or the like, which is rotatable around the protrusion 34, and orthogonal to both side surfaces. Side plates 38 and 38 having a predetermined width are fixedly provided, The body rubber 37 is held in one groove formed by the side plates 38 and 38, and the other surface and the other groove formed by the side plates 38 and 38 have one surface of the support beam 7 and both sides in the vicinity thereof. And a sliding plate 39 made of austenitic stainless steel or the like that slidably holds the surface.

  FIG. 5 shows an assembling method of the soundproof shock absorbing device 33. The main body rubber 37 is fitted into one groove portion of the sliding plate 39 and held in a fixed state, and the protrusion of the base plate 35 is inserted into the insertion hole 36 of the main body rubber 37. 34 is inserted in a freely rotatable manner.

The operation of the soundproof shock absorbing device 33 will be described with reference to FIG.
As shown in FIG. 7 (a), when the bridge girder is extended from the normal state as shown in FIG. 7 (b), the space between the bridge girders becomes narrow, but at that time, the sliding plate 39 slides with respect to the support beam 7. Thus, external force and impact are absorbed, and a soundproof shock absorbing effect is exhibited.
In addition, as shown in FIG. 7C, when the bridge girder contracts, the space between the bridge girders is widened. At that time, the sliding plate 39 slides with respect to the support beam 7 to absorb external force and impact, and soundproof shock absorbing effect. Is demonstrated.

Further, as shown in FIG. 7D or 7E, when the support beam 7 rotates in the bridge axis direction perpendicular movement in which the bridge beam end moves in the direction perpendicular to the bridge axis direction, the support beam 7 As the sliding plate 39 of the soundproof shock absorbing device 33 slides, the main body rubber 37 rotates around the projection 34 of the base plate 35 to orient the support beam 7 and respond to the subsequent expansion and contraction, thereby applying external force. In addition, the shock is absorbed and the soundproof shock absorbing effect is exhibited.
Although not shown, the main body rubber 37 absorbs external force in the vertical direction and impact, and exhibits a soundproof shock absorbing effect.

Next, the configuration of the seal rubber 32 will be described.
1, the right and left end plate beams 4A, 4B and an appropriate number of cell plate beams 4C, 4C,... As shown in the figure, notch grooves 51 and 51 for engaging and engaging both ends of the seal rubber 32 are formed in the longitudinal direction of the plate beams 4 and 4, respectively, while the both ends of the seal rubber 32 are shown in FIGS. Are formed with extending portions 52, 52 extending in the longitudinal direction of the seal rubber 32 to be inserted into the notched grooves 51, 51.
The notch groove 51 is formed with an engaging portion 51a having a wide groove width at the inner back portion, while the fitting portion 52 is formed with a locking portion 52a having a wide width at the tip portion. The engaging portion 52a is configured to be engaged with the engaging portion 51a.

  The insertion portion 52 opens to the exposed surface side when the insertion portion 52 is inserted into the notch groove 51, and a wedge-shaped groove portion 53a having a wider groove width in a sectional view wedge shape is formed in the inner back portion. The secondary insertion groove 53 is formed to extend in the longitudinal direction of the seal rubber 32. On the other hand, in order to be engaged with the wedge-shaped groove 53a, the wedge-shaped distal end portion having a wider width in a wedge shape in section is formed at the distal end portion. A wedge-shaped rubber 54 formed with a hardness higher than that of the seal rubber 32 is provided so as to be fitted over the entire length of the secondary insertion groove 53.

  When the wedge-shaped rubber 54 is fitted into the secondary insertion groove 53 of the seal rubber 32, the wedge-shaped tip end portion 53 a of the wedge-shaped rubber 54 is fitted into the wedge-shaped groove portion 53 a of the secondary insertion groove 53. The fitting portion 52 is pressed against the notch groove 51 of the plate beam 4 to prevent the sealing rubber 32 from coming off from the notch groove 51, and the wedge-shaped tip portion 53a of the wedge-shaped rubber 54 is secondarily fitted. By engaging with the wedge-shaped groove 53a of the groove 53, it is possible to prevent the wedge-shaped rubber 54 from falling off from the secondary insertion groove 53.

As shown in FIG. 11 (a), when the left and right end plate beams 4A and 4B are connected in the longitudinal direction, connecting pieces 61 and 61 that are in contact with each other are connected to the end portions. The pieces 61, 61 may be connected by bolts and nuts 62, 62.
Further, as shown in FIG. 11B, when the cell plate beams 4C, 4C are connected in the longitudinal direction, the end of the other cell plate beam 4C is inserted into the end of the one cell plate beam 4C. A plate 63 is attached, and connecting pieces 64 and 64 are connected to the lower ends of the end portions of one and the other cell plate beams 4C and 4C, and the connecting pieces 64 and 64 are connected by bolts and nuts 65. In addition, when the cell plate beams 4C and 4C are connected in the longitudinal direction, they can be connected by a taper pin 66 as shown in FIG.

Since the modular bridge expansion / contraction device 31 of the present invention is configured as described above, the following effects (1) to (5) are obtained as in the road bridge expansion / contraction device of Patent Document 1. The description will be made using the reference numerals of the drawings used to describe the road bridge telescopic device of Patent Document 1.
(1) Expansion and contraction action When the distance between the left and right end plate beams 4A and 4B or the cell plate beam 4C changes, the expansion and contraction device 31 for the module type bridge is expanded and contracted, and the seal rubber 32 is deformed. In this case, the load on the modular bridge telescopic device 31 is supported by the cell plate beams 4C, 4C... And the support beams 7, 7..., And the load is transmitted to the left and right end plate beams 4A and 4B and the left and right beams 2 and 3. However, the support beam 7 can freely move through the left and right end plate beams 4A and 4B, and the upper and lower load support beams 15 and 16 of the support beam 7 have a displacement pressure lead rubber layer 17 in the middle thereof. The impact pressure can be adjusted.

(2) When there is a rotating transverse gradient At the end of the girder, not only the horizontal displacement due to the expansion and contraction of the girder, but also rotation (tilt) or transverse gradient caused by various changes in load, rotation (tilt) occurs. Alternatively, when a crossing gradient occurs, road surface unevenness accompanying expansion and contraction occurs. Even in such a case, the change of the beam end can be absorbed and adjusted by the displacement of the support beam 7 in the cutout hole 5.

(3) Support of load A live load by a vehicle or the like is directly applied to the cell plate beams 4C, 4C, or the left and right end plate beams 4A, 4B. Among them, the load received by the left and right end plate beams 4A and 4B is directly transmitted to the left and right girders 2 and 3, but the load applied to the cell plate beams 4C, 4C... Is once received by the support beam 7 and left and right end plate beams 4A and 4B. It is transmitted to digits 2 and 3. Therefore, the support beam 7 is a beam that is freely supported at both ends, and there is a displacement pressure lead rubber layer 17 in the middle part of the support beam 7, and such a function is impossible for the fixing part of the modular bridge telescopic device 31. Buffer without causing rotational force.
(4) Seal rubber wear, etc. Since the cell plate beam 4C and the left and right end plate beams 4A, 4B are located at the height of the road surface, and the seal rubber 32 is set at a position below the predetermined dimension from this, the load is supported. There is no concern about wear of the seal rubber 32 without any influence. These are very advantageous for the use of spike tires in snowy regions.

(5) Other effects In addition to this, the modular bridge expansion and contraction device 31 of the present invention can be manufactured at low cost, has the effects of being easy to assemble because of the small number of parts, and economical. is there.

Further, the modular bridge expansion and contraction device 31 of the present invention is an improvement of the road bridge expansion and contraction device of Patent Document 1, and therefore cannot be expected from the Patent Document 1 of the road bridge expansion and contraction device. It has various effects.
(1) When the bridge girder is extended or the bridge girder is contracted, the sliding plate 39 slides with respect to the support beam 7, so that the force and impact due to deformation are absorbed, and a soundproof shock absorbing effect is exhibited. Further, when the bridge beam end moves in a direction perpendicular to the bridge axis and the support beam rotates, the sliding plate 39 slides with respect to the support beam 7, and the main rubber 37 rotates around the protrusion 34 of the base plate 35, and external force or The shock is absorbed and the soundproof shock absorbing effect is exhibited.
(2) The main body rubber 37 relieves external forces and impacts and exhibits a soundproof shock absorbing effect.
(3) The notch groove 51 of the plate beams 4 and 4 is formed with an engaging portion 51a having a wide groove width at the inner back, while the fitting portion 52 of the seal rubber 32 is wide at the tip. Since the engaging portion 52a is formed and the engaging portion 52a is configured to be engaged with the engaging portion 51a, the engaging portion 52 of the seal rubber 32 is inserted into the notch groove 51, whereby the engaging portion When 52a is engaged with the engaging portion 51a, the fitting portion 52 of the seal rubber 32 is surely fitted into and engaged with the notch groove 51, and the fitting portion 52 of the seal rubber 32 is not easily detached from the notch groove 51. The effect can be expected.

(4) The insertion portion 52 opens to the exposed surface side when the insertion portion 52 is inserted into the notch groove 51, and has a wedge-shaped groove portion 53a having a groove width widened in a cross-sectional view in a wedge shape inside. Is formed so as to extend in the longitudinal direction of the seal rubber 32. On the other hand, in order to be engaged with the wedge-shaped groove 53a, a wedge-shaped wedge whose width is widened in a sectional view as a wedge is formed at the tip. The wedge-shaped rubber 54 formed with the tip end portion 54 a and having a higher hardness than the seal rubber 32 is provided so as to be fitted over the entire length of the secondary insertion groove 53. When inserted into the secondary insertion groove 53, the wedge-shaped tip end portion 53 a of the wedge-shaped rubber 54 is inserted into the wedge-shaped groove portion 53 a of the secondary insertion groove 53, so that the insertion portion 52 of the seal rubber 32 is inserted into the plate beam 4. The fitting portion 5 of the seal rubber 32 by being crimped to the notch groove 51 The wedge-shaped rubber 54 is prevented from falling off from the notch groove 51, and the wedge-shaped tip 54 a of the wedge-shaped rubber 54 is engaged with the wedge-shaped groove 53 a of the secondary-inserted groove 53. Dropping from the groove 53 can be prevented.

2 Left Girder 3 Right Girder 4 Plate Beam 4A Left End Plate Beam 4B Right End Plate Beam 4C Cell Plate Beam 5 Cut Out Hole 6 Projection Pin 7 Support Beam 8 Reaction Force 3 Stage Spring 31 Modular Bridge Stretcher 32 Seal Rubber 33 Soundproof Shock absorber 34 Projection 35 Base plate 36 Insertion hole 37 Body rubber 38 Side plate 39 Sliding plate 51 Notch groove 51a Engagement part 52 Insertion part 52a Locking part 53 Secondary insertion groove 53a Wedge-type groove part 54 Wedge-type rubber part 54a Wedge-type tip part

Claims (2)

In a modular bridge expansion and contraction device for connecting between beams of road bridges composed of multiple beams.
A left end plate beam attached to the wall of the left girder of the left and right girder facing each other;
A right end plate beam attached to the girder wall of the right girder,
An appropriate number of cell plate beams arranged in parallel with the left and right end plate beams between the left and right end plate beams;
The left and right end plate beams and the appropriate number of cell plate beams are pierced through the cutout holes and slidable perpendicularly to the longitudinal direction of the left and right end plate beams and the appropriate number of cell plate beams. In order to prevent the left and right end plate beams from coming off from the respective cutout holes, projecting pins are formed at the lower ends of both ends in order to engage with the vicinity of the cutout holes of the left and right end plate beams. With the appropriate number of support beams,
The left and right end plate beams and the appropriate number of cell plate beams are respectively arranged in the vicinity of the front and rear of the support beam between the adjacent plate beams, and urge the adjacent plate beams in a direction away from each other. A plurality of reaction force three-stage springs that generate a three-stage reaction force;
The left and right end plate beams and the appropriate number of cell plate beams are disposed between the upper ends of the plate beams adjacent to each other so as to extend in the longitudinal direction of the plate beams, and seal between the upper ends of the plate beams adjacent to each other. A plurality of seal rubbers,
The left and right end plate beam cutout holes are provided with a box having anchor bolts on the side of the girder end wall of the cutout hole to prevent inflow of concrete or an attachment, and the girder end wall of the cutout hole. A modular bridge expansion and contraction device surrounded by a side,
A base plate in which one surface is fixed to the upper inner wall surface or lower inner wall surface of the cutout hole and a plurality of disk-shaped protrusions are formed on the other surface, and one protrusion of the base plate is inserted on one surface A plurality of rubber plate-shaped body rubbers that are rotatable around the protrusions, and a side plate having a predetermined width that is orthogonal to both side surfaces are fixed to each other, and one side and both side plates are formed. A soundproof shock buffer having a main body rubber in the groove portion and a sliding plate that slidably holds one surface of the support beam and both side surfaces in the vicinity thereof in the other groove portion formed by the other surface and both side plates. A module type bridge expansion / contraction device, wherein the device is disposed by fixing one surface of the base plate to the upper inner wall surface and the lower inner wall surface of the cutout hole. A notch groove for engaging and engaging both ends of the seal rubber at a position below a predetermined dimension from the upper end of the adjacent plate beam adjacent to each other of the right and left end plate beams and the appropriate number of cell plate beams. Formed in the longitudinal direction of the beam,
The notch groove is formed with an engagement portion having a wider groove width in the inner back part,
On the other hand, the both sides of the seal rubber are inserted into the notch groove, and an insertion part for engaging with the engagement part of the notch groove extends in the longitudinal direction of the seal rubber,
The fitting portion is configured such that a locking portion having a wide width is formed at a distal end portion, and the locking portion is locked to the engaging portion,
Further, the insertion portion opens on the exposed surface side when the insertion portion is inserted into the notch groove, and a wedge-shaped groove portion having a wide groove width in a sectional view wedge shape is formed in the inner back portion. A next insertion groove is formed extending in the longitudinal direction of the seal rubber;
On the other hand, in order to engage with the wedge-shaped groove portion, a wedge-shaped tip portion having a wider width in a sectional view wedge shape is formed at the tip portion, and the wedge-shaped rubber formed with higher hardness than the seal rubber is It is provided so that it can be inserted freely over the entire length of the secondary insertion groove,
When the wedge-type rubber is inserted into the secondary insertion groove of the seal rubber, the wedge-type tip portion of the wedge-type rubber is inserted into the wedge-type groove portion of the secondary insertion groove, whereby the seal rubber insertion portion Is pressed against the notch groove of the plate beam to prevent the seal rubber fitting portion from falling off the notch groove, and the wedge-shaped tip portion of the wedge-shaped rubber is a wedge-shaped groove portion of the secondary insertion groove. 2. The modular bridge telescopic device according to claim 1, wherein the wedge-shaped rubber is configured to prevent the wedge-shaped rubber from falling off from the secondary insertion groove.

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