JP2014084690A - Bridge expansion device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bridge expansion device which can prevent clogging of a gap with soil, refuse and the like, and can suppress deterioration of drivability and comfort in a traveling vehicle.SOLUTION: A face plate 3, which is composed of carbon fiber laminated plates in which bundles of carbon fibers arranged in a predetermined direction are arrayed, is mounted to a first slide plate 1 or a second slide plate 2 so as to cover a groove part between the first slide plate 1 and the second slide plate 2.

Description

  The present invention relates to a bridge telescopic device.

  2. Description of the Related Art Conventionally, an expansion / contraction device that allows expansion / contraction of a bridge girder is provided between a bridge girder and an abutment of a bridge, or a portion between a bridge girder and a bridge girder. Such a telescopic device is fitted to each other by, for example, a steel plate on which finger portions are formed (see, for example, Patent Document 1).

JP 2000-96502 A

  The telescopic device described in Patent Document 1 is movable in the direction of the bridge axis of the bridge by meshing with the finger portions, and can follow the expansion and contraction of the bridge girder. However, when the finger portions are exposed, earth and sand and dust are clogged in the groove portions between the finger portions, and the expansion / contraction function of the expansion / contraction device may be lowered. Moreover, since the finger part is comprised with plates, such as rubber and steel, the groove part between the finger parts of this expansion-contraction apparatus will be exposed, and the safety | security with respect to a vehicle or a human will fall. Furthermore, when the vehicle passes over the groove, vibration is generated in the vehicle, the comfort is lowered, noise is generated, and the environment to the neighborhood is deteriorated. Further, when the vehicle travels in the groove portion between the finger portions, an impact is applied to the bridge, and the lifetime of the bridge is shortened by the impact, and the maintenance cost becomes enormous.

  Various problems may occur due to such a groove, but this problem can be solved by using an extension device without a groove. In order to obtain a telescopic device without a groove part, for example, a steel plate can be attached on the finger part so as to cover the groove part. In this case, since the steel plate is supported by the Feinger portion across the groove portion, the thickness of the steel plate must be able to withstand the load caused by the traveling vehicle, and thus becomes a considerable thickness. As a result, a large level difference is generated between the steel plate and the finger portion, so that an impact is applied to the bridge or noise is generated when the vehicle or the like travels on the steel plate. Further, since the toughness of the steel plate is low, when a gap is generated between the steel plate and the finger portion, an impact or noise is generated during traveling of the vehicle.

  The present invention has been made in view of the above-described circumstances, and an example of an object is to solve the above-described problems, and a bridge expansion and contraction device that can solve these problems is provided. The purpose is to do.

  The expansion and contraction device for a bridge according to the present invention includes a joint between a first bridge girder of a bridge and a second bridge girder facing the first bridge girder, or a joint between a first bridge girder of the bridge and a bridge abuts the first bridge girder. In a telescopic device provided in a part, a face plate composed of a carbon fiber laminated plate arranged as a road surface in the joint part and arranged in a bundle of carbon fibers arranged in a predetermined direction, and supporting the face plate, Expansion and contraction means that can extend and contract in the bridge axis direction of the bridge, and the extension means is provided at an end of the first bridge girder in the bridge axis direction and protrudes outward in the bridge axis direction A plurality of first slide members arranged side by side in the direction of the expansion joint intersecting the bridge axis direction, and the first slide member provided at an end of the second bridge girder or the abutment facing the first slide member. Inserted into the gap formed between the first protrusions A plurality of second slide members arranged side by side in the direction of the expansion joint, and the face plate is attached to one slide member, and the first slide member and the second slide member, It is characterized by covering the groove between the two.

  Since a face plate composed of carbon fiber laminated plates in which bundles of carbon fibers arranged in a predetermined direction are arranged so as to cover the groove portion between the first slide member and the second slide member, there is no gap, It is possible to prevent clogging of gaps such as earth and sand and garbage, and to suppress a decrease in traveling performance and comfort with respect to the traveling vehicle.

(A) is a perspective view which shows a mode that the expansion-contraction apparatus is installed in the bridge, (b) is AA sectional drawing of Fig.1 (a). (A) is a partial top view of the expansion-contraction apparatus in a reference position, (b) is BB sectional drawing of Fig.2 (a). (A) is a partial plan view when the bridge girder is extended, that is, when the telescopic device is reduced, and (b) is a cross-sectional view taken along the line C-C in FIG. (A) is a partial plan view when the bridge girder is contracted, that is, when the telescopic device is expanded, and (b) is a DD cross-sectional view of FIG. 4 (a). (A) is a plan view of the face plate, (b) is a side view of the face plate of FIG. 5 (a), and (c) is a partially enlarged view of FIG. 5 (b). (A) is a top view of a 1st prepreg, (b) is a top view of a 2nd prepreg, (c) is a top view of a 3rd prepreg. (A) is a top view of the 1st slide plate and 2nd slide plate in case the shape of a protrusion and a clearance gap is trapezoid shape (a joint part is a tooth shape), (b) is the shape of a protrusion and a clearance gap. Is a plan view of the first slide plate and the second slide plate in the case of a triangular shape (the joint portion is a mountain shape), and (c) is a semicircular shape of the protrusion and the gap portion (the joint portion is a wave shape) ) Is a plan view of the first slide plate and the second slide plate, and FIG. 8D is a plan view of the first slide plate and the second slide plate in the case of a streak-shaped joint portion that does not have a protrusion. It is. (A) is a perspective view which shows a mode that the existing expansion device is installed in the bridge, (b) is a perspective view which shows a mode that the existing expansion device was improved by the face plate.

  Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings. As shown in FIG. 1, the bridge expansion / contraction device X according to the present invention supports the road surface R of the bridge B, the joint of the end of the bridge R, in other words, the end of the bridge girder B1 of the bridge B and the bridge girder B1. It is provided between the abutment B2 supported via B3, and allows expansion and contraction and deflection of the bridge beam B1 due to temperature change, deformation of the bridge beam B1 due to earthquake, and the like.

  The telescopic device X includes a face plate 3 arranged as a road surface at a joint portion (joint portion) between the bridge beam B1 and the abutment B2, a first slide plate 1 provided at an end portion in the bridge axial direction of the bridge beam B1, and a bridge of the bridge beam B1. A second slide plate 2 provided on the abutment B2 facing the first slide plate 1 at a predetermined interval along the axial direction, a first receiving beam 4 for supporting the first slide plate 1, and a second slide A second receiving beam 5 for supporting the plate 2 is provided. The face plate 3 is supported by the first slide plate 1 and the second slide plate 2 and covers a groove formed between the first slide plate 1 and the second slide plate 2.

  The first receiving girder 4 and the second receiving girder 5 are made of a steel material having a U-shaped cross section. The first receiving beam 4 is supported by a main beam B11 having an I-shaped cross section constituting the bridge beam B1 and is fixed by a predetermined bolt 61. Further, the first receiving beam 4 is fixed to the first slide plate 1 with a predetermined bolt 62 such as a counterbore bolt. And the floor board B12 which comprises the bridge beam B1 is formed in the upper surface side of the main beam B11, and the back surface side of the 1st slide plate 1 and the 1st receiving beam 4. As shown in FIG.

  On the other hand, the second receiving beam 5 is supported by a receiving part B21 of the abutment B2, and is fixed to an anchor bolt 64 embedded in the receiving part B21. The second receiving beam 5 is fixed to the second slide plate 2 with a predetermined bolt 63 such as a counterbore bolt. And the floor board B22 which comprises the abutment B2 is formed in the back side of the 2nd slide plate 2, and the back side of the 2nd receiving beam 5. As shown in FIG.

  In addition, predetermined reinforcing bars 71 and 72 are provided on the back side of the first receiving beam 4 and the second receiving beam 5 in order to improve the fixing property with the floor plates B12 and B22. The installation method to the bridge B of the expansion-contraction apparatus X is not restricted to this, It can change suitably.

  Next, the first slide plate 1 and the second slide plate 2 will be described with reference to FIG. The 1st slide plate 1 and the 2nd slide plate 2 are each comprised with the steel faceplate, and it is a bridge-axis direction from one edge part (long side part) of the rectangular base parts 1A and 2A and the base parts 1A and 2A. It is comprised by the joint parts 1B and 2B which protrude and form toward the outer side.

  The joint portions 1B and 2B are arranged in parallel at a predetermined interval in the long side direction of the base portions 1A and 2A, in other words, in a predetermined expansion joint direction that intersects the bridge axis (orthogonal in the present embodiment). And a plurality of strip-shaped (rectangular) protrusions 11 and 21, and rectangular gaps 12 and 22 formed between the protrusions 11 and 21 and the protrusions 11 and 21. . In a state where the telescopic device X is installed on the bridge B, the protrusion 21 (11) of the other slide plate 2 (1) enters the gap 12 (22) of the one slide plate 1 (2). The central axes of the protrusions 11 and 21 and the gaps 12 and 22 are parallel to the bridge axis of the bridge beam B1.

  The projecting portions 11 and 21 and the gap portions 12 and 22 of the slide plates 1 and 2 are formed in the same shape. That is, the length L1 of the first protrusion 11 in the bridge axis direction and the length W1 of the expansion joint direction are the same as the length L2 of the second protrusion 21 in the bridge axis direction and the length W2 of the expansion joint direction. is there. Also, the length B1 of the first gap portion 12 in the expansion joint direction and the length B2 of the second gap portion 22 in the expansion joint direction are the same. Here, the lengths B1 and B2 of the gaps 12 and 22 in the expansion joint direction are slightly longer (for example, about several mm) than the lengths W1 and W2 of the protrusions 11 and 21 in the expansion joint direction. As described above, since the other protrusions 21 and 11 are inserted into the gaps 12 and 22 in the installed state as described above, there is a slight gap between the protrusions 11 and the protrusions 21 adjacent to each other in the expansion joint direction. This is for preventing contact between the first protrusion 11 and the second protrusion 21.

  As described above, the first slide plate 1 and the second slide plate 2 have a comb-like shape as a whole, and are in a state of being meshed with a slight margin, so the bridge beam B1 moves smoothly in the bridge axis direction. can do.

  By the way, as described above, the bridge beam B1 expands and contracts due to a temperature change or the like. Therefore, the first slide plate 1 approaches the second slide plate 2 (see FIG. 3) or the second slide plate along with the expansion and contraction. Separated from 2 (see FIG. 4).

  Next, the face plate 3 will be described with reference to FIG. First, the structure of the face plate 3 will be described. The face plate 3 is molded into a rectangular shape in plan view having a length in the bridge axis direction of 300 mm and a length in the expansion joint direction of 3500 mm. That is, a plurality of face plates 3 shown in FIG. 5 (a) are arranged in parallel at the joint between the bridge beam B1 and the abutment B2 along the direction of the expansion joint.

  Tapered portions 31 and 31 are formed in a range of 50 mm from the position 15 mm away from both ends to the center in the 90 ° direction with the expansion joint direction of the bridge beam B1 as the reference angle of 0 °. The taper portions 31 and 31 rise toward the center in the 90 ° direction, and the thickness of the center portion 32 having a range of 170 mm sandwiched between the taper portions 31 and 31 is the maximum. As described above, the tapered portions 31 of the face plate 3 are inclined along the traveling direction of the vehicle. In addition, the thickness of the center part 32 is 3.0 mm, and the thickness of the edge part 33 formed in the range from the both ends to the lower end of the taper parts 31 and 31 is 1.5 mm.

  The face plate 3 is composed of a carbon fiber assembly plate (carbon fiber molding plate) in which a bundle of carbon fibers is impregnated with an epoxy resin and a prepreg that has been reacted in a semi-cured state is laminated and pressurized and vacuumed and heated. There are three types of carbon fiber prepregs constituting the face plate 3, and the direction of the carbon fibers is the 0 ° direction (expansion joint direction) (see FIG. 6A), hereinafter referred to as “first prepreg”. ), 90 ° direction (bridge axis direction) prepreg (see FIG. 6B, hereinafter referred to as “second prepreg”), and carbon fiber prepreg knitted in the ± 45 ° direction (FIG. 6C) Reference, hereinafter referred to as “third prepreg”).

  The face plate 3 is composed of 12 layers of prepregs of the first layer 3a to the 12th layer 3l by combining the above three types of prepregs. Specifically, as shown in FIG. 5C, the second layer 3b, the fourth layer 3d, the sixth layer 3f, the seventh layer 3g, the ninth layer 3i, and the eleventh layer 3k are configured by the first prepreg. The third layer 3c, the fifth layer 3e, the eighth layer 3h, and the tenth layer 3j are constituted by the second prepreg, and the first layer 3a and the twelfth layer 3l are constituted by the third prepreg. Hereinafter, if necessary, the central six layers (fourth layer 3d to ninth layer 3i) in the vertical direction of the face plate 3 are collectively referred to as “middle layer 3B”, and the upper three layers (first layer) of the middle layer 3B are referred to as “first layer”. 3a to 3c) are generally referred to as “upper layer 3A”, and the lower three layers (tenth layer 3j to twelfth layer 3l) of middle layer 3B are collectively referred to as “lower layer 3C”.

  The fourth layer 9d to the ninth layer 3i constituting the middle layer 3B are stacked in a staircase pattern from the upper side to the lower side. In other words, the lengths of the fourth layer 3d to the ninth layer 3i in the 90 ° direction are gradually increased from the upper side to the lower side.

  On the other hand, both ends of the lower layer 3C in the 90 ° direction are aligned and molded. That is, the 90 ° direction lengths of the tenth layer 3j to the twelfth layer 3l constituting the lower layer 3C are the same. The 90 ° direction length of the tenth layer 3j to the twelfth layer 3l is longer than the 90 ° direction length of the longest ninth layer 3i in the middle layer 3B.

  The upper layer 3A is molded so as to completely cover the middle layer 3B in the 90 ° direction and to coincide with the lower layer 3C at both ends. As described above, by preventing the carbon fiber cross section from being exposed in the 90 ° direction, that is, the direction in which the vehicle travels, it is possible to prevent the carbon fiber from being peeled, damaged, worn, or the like. Further, the upper layer 3A is formed in an inclined shape along the step in the range of the middle layer 3B. As a result, slopes are formed at substantially both end portions of the face plate 3 in the 90 ° direction, so that a step between the face plate 3 and the surrounding road surface is reduced, thereby preventing a decrease in running performance and comfort of the vehicle. it can.

  The first layer 3a to the twelfth layer 3l have the same length in the 0 ° direction, and are molded with both ends aligned.

  In the case where there is a distinction between the upper and lower lines as in the present embodiment, the face plate 3 is desirably bonded only to the slide plate on the side on which the vehicle travels. For example, as shown in FIG. 1 (a), only the second slide plate 2 is adhered in the range related to the first vehicle traveling direction, and only the first slide plate 1 is adhered in the range related to the second vehicle traveling direction. Has been. Therefore, even when the bridge beam B1 expands and contracts, the first slide plate 1 and the second slide plate 2 can move relative to each other in the bridge axis direction, and the expansion / contraction function of the expansion / contraction device X is maintained.

  Next, the relationship between the cross-sectional structure and strength of the face plate 3 will be described. As shown in FIGS. 2 to 4, the face plate 3 is supported by the first slide plate 1 and the second slide plate 2 over the entire circumference of the groove between the first slide plate 1 and the second slide plate 2. , Each groove is covered. Therefore, it is necessary to design the strength of the face plate 3 so that it can resist the load of a vehicle or the like traveling on each groove. Specifically, the strength of the face plate 3 is determined based on a bending moment based on a load of a vehicle or the like traveling on the face plate 3.

  A groove between the first slide plate 1 and the second slide plate 2 is formed by a space surrounded by the first slide plate 1 and the second slide plate 2. Therefore, as shown in FIG. 2, the size of the groove portion becomes larger when the bridge beam B1 contracts (see FIG. 3) and becomes smaller when the bridge beam B1 extends, based on the state when the bridge beam B1 is not expanded and contracted. (See FIG. 4).

  Here, since the gaps 12 and 22 are rectangular and the protrusions 11 and 21 move along the long side direction, when the bridge beam B1 is expanded and contracted, the bridge axis direction lengths A1 and A2 of the groove change. However, the expansion joint direction lengths B <b> 1 and B <b> 2 of the gap portions 12 and 22 that are the lengths of the expansion joint direction of the grooves are constant. Therefore, the bridge axis direction lengths A1 and A2 of the groove portions are longer than the expansion joint direction lengths B1 and B2 at a certain point in the process of expanding and contracting the bridge beam B1.

  Here, in the length between the supporting points related to the strength against the bending moment of the face plate 3, the dominant load direction is the short side direction, so the short side direction is the main direction and the bending moment based on the amount and arrangement of carbon fibers. Intensity is calculated. Here, when the bridge beam B1 is extended from the reference position, that is, when the telescopic device X is reduced, the length in the short side direction in the groove portion between the first slide plate 1 and the second slide plate 2 is the length of the groove portion. In some cases, the bridge axis lengths A1 and A2 may be obtained. However, when the bridge beam B1 contracts, that is, when the expansion / contraction device X expands, the lengths in the short side direction of the groove portions become the expansion joint direction lengths B1 and B2 of the gap portions 12 and 22, respectively. Furthermore, since the expansion joint direction lengths B1 and B2 of the gap portions 12 and 22 are constant, by designing the expansion joint direction lengths B1 and B2 of the gap portions 12 and 22 as dominant short side directions, The thickness of the face plate 3 can be made constant even for the bridge girder B1 of various amounts of expansion and contraction.

  As a result, the direction of the carbon fibers constituting the face plate 3 is preferably parallel to the direction resisting the force acting on the face plate 3 in the expansion joint direction. The strength of the face plate 3 with respect to the bending moment is determined by the thickness of the carbon fiber prepreg in the direction of the expansion joint, that is, the first prepreg. In other words, the thickness of the first prepreg is set in a range that can resist the bending moment based on the maximum load acting on the face plate 3 at the center of the groove portion in the direction of the expansion joint. In this way, even when the design expansion / contraction amount of the bridge girder B1 in the bridge axis direction is increased, by increasing the bridge axis direction lengths L1, L2 of the protrusions 11, 21 as the planar shape of the slide plates 1, 2, the groove portion By making the length of the expansion joint direction constant, the strength against the bending moment of the face plate 3, that is, the thickness of the face plate 3, is set to be constant regardless of the scale of the bridge B such as the width of the bridge beam B1 ( Can be unified).

  In the present embodiment, among the types of prepregs constituting the face plate 3, the first prepreg is the most, and the center two layers (the fifth layer 3e and the sixth layer f) in the stacking direction are the first prepregs. It consists of Four first prepregs of the face plate 3 are arranged in addition to the two layers. The number of layers of the first prepreg, in other words, the thickness is appropriately set according to the maximum bending moment acting on the face plate 3 in the expansion joint direction.

  Further, since the face plate 3 includes the second prepreg, the entire face plate 3 can obtain a toughness effect in the vehicle traveling direction (bridge axis direction). Thereby, when there is a gap between the back surface of the face plate 3 and the surface of the first slide plate 1 and / or the second slide plate 2, the impact applied to the bridge B when a vehicle or the like travels on the face plate 3. Can be reduced. Furthermore, since the face plate 3 includes the second prepreg, it is possible to prevent the first prepreg from being scattered in a direction orthogonal to the carbon fibers.

  Furthermore, in addition to the first prepreg and the second prepreg, the face plate 3 includes a third prepreg made of carbon fibers knitted in the ± 45 ° direction, so that the direction of the carbon fiber is 0 °, 90 °. Since the angle is ± 45 °, which is a multi-direction such as the US mark, the force against the out-of-plane compression force of the face plate 3 increases. Furthermore, the twist which generate | occur | produces when a vehicle etc. drive | work and an eccentric load acts on the faceplate 3 can be prevented.

  Moreover, since the 3rd prepreg is distribute | arranged to the uppermost side and the lower side of the faceplate 3, the failure | damage of the carbon fiber by contact with a vehicle etc. can be prevented. Further, when the third prepreg is included in the face plate 3 and the overall toughness of the face plate 3 is improved, there is a gap between the face plate 3 and the surface of the first slide plate 1 and / or the second slide plate 2. In addition, the impact applied to the bridge B when a vehicle or the like travels on the face plate 3 can be reduced.

  Furthermore, since the laminated structure of the carbon fibers constituting the face plate 3 is vertically symmetric, it is possible to prevent the twist and distortion of the entire face plate 3 from occurring. Moreover, the warp and distortion at the time of molding of the face plate 3 can be prevented by this vertically symmetrical structure.

  In the telescopic device X according to the present embodiment, the protrusions 11 and 21 move in the gaps 12 and 22 with the expansion and contraction of the bridge beam B1, and the first slide plate 1 and the second slide plate 2 are moved. The lengths A1 and A2 in the bridge axis direction of the grooves (spaces) between them change. However, since the expansion joint direction lengths B1 and B2 of the gap portions 12 and 22 which are the lengths of the expansion joints of the small groove portions with respect to the bridge axis direction length are constant, the design bending moment related to the face plate 3 is also It is constant regardless of the expansion and contraction of the bridge girder B1. Therefore, the thickness and cross-sectional structure of the face plate 3 can be unified, and the manufacturing cost can be reduced.

  Further, the face plate 3 is formed with tapered portions 31 at substantially both ends in the bridge axis direction, but the central portion 32 has the maximum thickness and is disposed perpendicular to the vehicle load. In the range where the bridge beam B1 expands and contracts, the groove is completely covered. This is because if the wheel load is supported by the tapered portion 31, the safety is lowered. That is, in the range where the bridge beam B1 expands and contracts, the taper portion 31 and the end portion 33 (the range indicated by “α” in FIGS. 2 to 4) other than the central portion 32 are the base portion 1A and the second slide plate of the first slide plate 1. 2 is supported by the base 2A.

  The face plate 3 is bonded to the protrusion 21 of the joint portion 2B and a part of the base portion 2A (shaded portions in FIG. 2A, FIG. 3A, and FIG. 4A) by epoxy resin. The slide plate 1 or the second slide plate 2 and the face plate 3 are integrated. In this way, the face plate 3 is adhered only to the slide plate on the side on which the vehicle is traveling, thereby preventing the expansion and contraction of the bridge beam B1 and preventing the bridge B and the joint structure from being damaged or destroyed. it can. Further, since the face plate 3 is fixed to the face plate on which the vehicle is facing, the face plate 3 is moved by traveling to the face plate 3 of the vehicle or the like in a state of floating from the surface of the first slide plate 1. Breakage can be prevented. In order to improve the adhesion between the face plate 3 and the slide plate 2, the back surface of the face plate 3 is roughened by a peel-ply manufacturing method with Hi-Grip processing having a fixing effect. In addition, the surface of the face plate 3 serving as a road surface may be subjected to Hi-Grip treatment as a slip prevention measure. Furthermore, these Hi-Grip treatments may be accompanied by glass fiber prepregs. In particular, in order to prevent electrolytic corrosion between the carbon fibers contained in the face plate 3 and the first and second slide plates 1 and 2 made of steel, a glass fiber prepreg or a resin-only prepreg is provided on the back surface of the face plate 3. Is further laminated to form an electrolytic corrosion prevention layer 3m (see FIG. 5).

  The adhesion between the face plate 3 and any one of the slide plates 1 and 2 is not limited to the application with an epoxy resin. For example, a glass fiber prepreg or a prepreg made only of a resin as an electrolytic corrosion prevention layer is provided on the back surface of the face plate 3. Intervene. Moreover, it is also possible to carry out by carrying out a pressurization vacuum and a heating integrally in a predetermined pot etc.

  As described above, the face plate 3 is supported by the first slide plate 1 and the second slide plate 2, which are the joint portions of the bridge B, and is movable in the bridge axis direction, the first slide plate 1 and the second slide plate 2. In order to reliably cover the groove portion generated in the moving range, that is, the expansion device X is a “fingerless joint” that does not have a groove portion, so that intrusion of earth and sand or dust into the groove portion is prevented, and the bridge beam B1 It is possible to prevent restraint such as expansion and contraction of the vehicle, reduce the safety and comfort of the vehicle traveling on the first slide plate 1 and the second slide plate 2, and suppress the generation of noise. Furthermore, since the face plate 3 is composed of a carbon fiber assembly made of a plurality of carbon fiber prepregs, a step difference from the road surface can be reduced by reducing the thickness of the face plate 3. As a result, it is possible to reduce a decrease in safety and comfort with respect to a vehicle or a motorcycle, and to suppress generation of noise. Furthermore, since the face plate 3 is composed of a carbon fiber laminated plate made of a plurality of carbon fiber prepregs, the toughness of the face plate 3 can suppress impacts on the bridge B due to vehicle running or the like. Furthermore, the attachment operation | work to the 1st slide plate 1 or the 2nd slide plate 2 of the face plate 3 can be made easy by the method of integration by an adhesive agent.

  Further, by making the entire shape of the first slide plate 1 and the second slide plate 2 into a comb shape and making the gap portions 12 and 22 into a rectangular shape, the strength against the bending moment of the face plate 3, that is, the face plate 3 can be set constant, the thickness can be reduced, road surface steps can be reduced, and the safety and comfort of the traveling vehicle can be improved.

  In the above example, the telescopic device of the present invention is applied to the joint portion between the bridge beam B1 and the abutment B2, but can be applied to the joint portion between the bridge beam B1 and the bridge beam opposite thereto. . Moreover, it is also possible to apply the expansion-contraction apparatus of this invention in the joint part of the bridge where the bridge axis direction is a curve. Furthermore, the expansion joint direction of the first slide plate 1 and the second slide plate 2 may be a direction that intersects at a predetermined angle other than an angle orthogonal to the bridge axis. The telescopic device of the present invention can also be applied to sidewalks and bicycle lanes other than the roadway portion of the bridge. Further, the shape and the cross-sectional structure of the face plate 3 are not limited to the above example, and can be appropriately designed.

  In addition, the telescopic device of the present invention can be applied not only to products produced in a factory, but also to improve an telescopic device in which an existing slide plate is arranged as part of the road surface. As the existing slide plates in this case, for example, as shown in FIG. 7, tooth-shaped slide plates 1 and 2 (see FIG. 7A), mountain-shaped slide plates 1 and 2 (see FIG. 7) 7 (b)), corrugated slide plates 1 and 2 (see FIG. 7 (c)), and comb-shaped slide plates 1 and 2. In this case, it is necessary to appropriately set the cross-sectional structure of the face plate 3 and the direction of the carbon fiber based on the assumed width of the groove between the slide plates 1 and 2 (distance between the support points).

  Further, if the design expansion / contraction amount is, for example, 50 mm or less in a bridge with a short span, it is not necessary to dare to make the slide plates 1 and 2 into a comb shape, but a streak shape (I type) as shown in FIG. The expansion / contraction apparatus of the present invention can be applied as the shape). In this case, the distance between the slide plates 1 and 2 is the distance in the bridge axis direction between the first slide plate 1 and the second slide plate 2, so the thickness of the face plate 3 with the second prepreg. Need to design. The existing groove type shape can also be improved in the field.

  When the telescopic device of the present invention is applied to an improved product in the field, as shown in FIG. 8 (a), the first slide plate 1 and the second slide plate 2 are arranged on the surface side, and the telescopic device X ' Is installed on the bridge B, the face plate 3 is bonded to the first slide plate 1 or the second slide plate 2 as shown in FIG. It is also possible to manufacture the telescopic device X locally.

  In this case, as described above, it is noted that the fiber direction of the carbon fiber related to the first prepreg of the face plate 3 is made to coincide with the expansion joint direction, and is adhered only to the slide plate on the side where the vehicle travels.

1 First slide plate (first slide member)
2 Second slide plate (second slide member)
3 Face plate 11 1st protrusion 12 1st clearance part 21 2nd protrusion 22 2nd clearance part 31 Tapered part 32 Central part 33 End part 3A Upper layer 3B Middle layer 3C Lower layer X Telescopic device

Claims (7)

In a telescopic device provided at a joint between a first bridge girder of a bridge and a second bridge girder facing the first bridge girder, or a joint between a first bridge girder of a bridge and the abutment facing the first bridge girder,
A face plate composed of a carbon fiber laminated plate arranged as a road surface at the joint, and a bundle of carbon fibers arranged in a predetermined direction;
Stretching means that supports the face plate and can be stretched in the direction of the bridge axis of the bridge,
The expansion / contraction means is
A first slide member provided at an end portion of the first bridge girder in the bridge axis direction, wherein a plurality of first protrusions protruding outward in the bridge axis direction are arranged in parallel in an expansion joint direction intersecting the bridge axis direction; ,
A second protrusion that is provided at an end of the second bridge girder or the abutment facing the first slide member and is inserted into a gap formed between the first protrusions of the first slide member, A plurality of second slide members arranged side by side in the direction of the expansion joint,
The bridge plate expansion and contraction device, wherein the face plate is attached to one slide member and covers a groove portion between the first slide member and the second slide member.   The bridge expansion / contraction apparatus according to claim 1, wherein the face plate includes first carbon fibers in which a fiber direction of the bundle of carbon fibers is parallel to the expansion joint direction.   The bridge expansion and contraction device according to claim 2, wherein the face plate further includes a second carbon fiber in which a fiber direction of the bundle of carbon fibers is parallel to the bridge axis direction.   The shape of the said 1st protrusion and the said 2nd protrusion is a substantially rectangular shape which makes the said bridge-axis direction a long side direction, The expansion-contraction of the bridge concerning any one of Claim 1 thru | or 3 characterized by the above-mentioned. apparatus.   The length in the direction orthogonal to the bridge axis of the first gap formed between the first protrusions and the second gap formed between the second protrusions is constant. The bridge expansion and contraction device according to Item 4.   The bridge expansion / contraction device according to any one of claims 1 to 5, wherein the face plate is bonded only to a slide member on a side on which a vehicle traveling on the bridge travels.   The bridge expansion and contraction device according to any one of claims 1 to 6, wherein an electrolytic corrosion prevention layer for preventing electrolytic corrosion between carbon fiber and metal is formed on a back surface of the face plate.