JP5063311B2 - Telescopic device - Google Patents

Description

  The present invention relates to a telescopic device installed on a joint of a floor slab of a road bridge, for example.

  Many sections of the highway in urban areas are elevated, and a plurality of road bridges are constructed in parallel in sections with many lanes and sections where ramps are connected to the main line. A vertical joint extending in the extending direction is provided between the decks of the parallel road bridges. Further, a horizontal joint extending in the width direction is provided between floor slabs adjacent to each other in the extending direction of each road bridge. In these vertical joints and horizontal joints, telescopic devices are installed. When relative displacement occurs between floor slabs due to pier settlement, floor slab expansion, or the like, the expansion and contraction device is deformed, thereby preventing the inconvenience of forming steps or gaps on the road surface.

  Conventionally, as this kind of expansion and contraction device, the one shown in FIG. 10 is known. The expansion / contraction device 510 is disposed at a vertical joint between two floor slabs 504 and 504, and both ends are supported by step portions 506 and 506 provided at opposite edges of each floor slab 504 (for example, , See Patent Document 1). The expansion / contraction device 510 includes a rubber main body 502 having a substantially rectangular cross section on which a vehicle travels. A wide lower steel plate for securing rigidity at the center in the width direction and the thickness direction of the main body 502. 511 and a narrow upper steel plate 512 are overlaid and buried. Fixed steel 514 having a substantially L-shaped cross section is embedded on both sides in the width direction of the main body 502, and anchors 508 are coupled to the horizontal portion of the steel 514 with nuts. The anchor 508 is embedded in the concrete 507, and both ends of the expansion / contraction device 510 are fixed to the edge of each floor slab 504. Long holes 513 extending in the thickness direction from both the front and rear surfaces are formed at positions adjacent to the center side of the fixing steel 514 on both sides in the width direction of the main body 502, leaving the center portion. When the relative displacement in the vertical direction occurs between the floor slabs 504 and 504, the expansion device 510 is configured such that the central portion of the main body 502 is inclined substantially linearly by the lower steel plate 511 and the upper steel plate 512. Both ends are bent at the portion where the long hole 513 is formed. In this way, the surface of the main body 502 is in a smoothly connected state so that the vehicle can smoothly travel on the surface of the main body 502.

  On the other hand, as another conventional telescopic device, a device as shown in FIG. 11A is known. The expansion / contraction device 520 is disposed at a vertical joint between the two floor slabs 521 and 521, and is a support plate fixed to the surface of the unevenness adjusting material 525 and 525 disposed opposite to the both floor slabs 521 and 521. 530, 530 and a flexible rope-like suspension material 533 spanned between the support plates 530, 530 (see, for example, Patent Document 2). A plurality of suspension members 533 are arranged at predetermined intervals in the extending direction of the vertical joints, and both end portions 533b of each suspension member 533 are sandwiched between the support plate 530 and the fixing plate 527 and are bolts 528. It is fixed with. A central portion 533 a of the suspension member 533 is curved downward between the floor slabs 521 and 521. As shown in the enlarged sectional view of FIG. 11B, rubber planar members 534 and 535 are arranged on both upper and lower surfaces of the suspension member 533, and the suspension member 533 is surrounded between the planar members 534 and 535. Filled with a lubricant such as grease. A covering material 545 is placed on the planar member 534 on the upper side of the suspension member 533 to the same height as the surface of the pavement material 540.

The expansion device 520 is capable of absorbing various deformations by smoothly twisting and deforming the curved central portion 533a of the suspension member in accordance with the relative displacement between the floor slabs 521 and 521. Further, the load of the vehicle traveling on the surface of the covering material 545 is distributed and applied to the suspension member 533 by the planar members 534 and 535 and the lubricant.
JP-A-8-120608 JP-A-2005-16085

  However, the expansion device 510 of Patent Document 1 shears from the end of the narrow upper steel plate 512 to the wide lower steel plate 511 when a relative displacement occurs between the floor slabs 504 and 504 and the central portion of the main body 502 is inclined. Force acts. For this reason, when the vehicle repeatedly travels on the surface of the main body 502, the action of the shearing force on the lower steel plate 511 is repeated, and the lower steel plate 511 may be cut. When the lower steel plate 511 is cut, every time the vehicle travels, the inclined main body 502 is greatly deformed at the cutting portion of the lower steel plate 512, and the bottom surface of the main body 502 collides with the surface of the stepped portion 506 to generate noise. There is a problem that arises.

  Further, in the expansion / contraction device 520 of Patent Document 2, the suspension member 533 is fixed to the support plates 530 and 530 with the fixing plate 527 and the bolt 528, and the planar members 534 and 535 are arranged on both upper and lower sides of the suspension member 533. The structure is complicated because it is filled with lubricant. Since it is necessary to construct this complicated structure on site, the construction period of the installation work of the expansion / contraction device 520 becomes long, and the construction cost increases.

  In the expansion / contraction device 520 of Patent Document 2, a planar member 534 and a plurality of lubricant members are interposed between a covering material 545 on which a vehicle travels on the surface and a suspension material 533 that supports the load of the vehicle. ing. Therefore, when a relative displacement occurs between the floor slabs 521 and 521, there is a possibility that a gap is formed in at least one of the boundaries between the members. In this case, with the impact of the vehicle passing through the surface of the covering material 545, the gap may be rapidly compressed to generate noise.

  Further, in the expansion / contraction device 520 of Patent Document 2, when a gap is generated at the boundary between members, the compression of the gap is repeated as the vehicle travels, and wear and fatigue are accumulated in the member that comes into contact with the compression to expand and contract. The device 520 may be damaged. That is, the expansion / contraction device 520 has a problem that durability after deformation tends to deteriorate.

  Therefore, an object of the present invention is to prevent the generation of noise even if relative displacement between floor slabs is ensured, durability is ensured, the structure is simple, and the expansion and contraction that can reduce the labor and cost of manufacturing and installation. To provide an apparatus.

In order to solve the above problems, the expansion device of the present invention is
A pair of fixing members respectively fixed to ends of a pair of floor slabs facing each other with a gap;
Both ends are fixed to the pair of fixing members, respectively, and the central portion of the lower side has a convex cross section curved downward, while the upper side is an elastic member that becomes a vehicle running surface,
The elastic member is embedded along the lower surface of the elastic member, and both end portions are along the surface of the fixing member in contact with the elastic member in a non-contact state. And a flexible load supporting member disposed on the surface.

  According to the above configuration, the pair of fixing members are fixed to the ends of the pair of floor slabs, both ends of the elastic member are fixed to the pair of fixing members, and the upper side surface of the elastic member becomes the vehicle running surface. . When the vehicle travels on the upper side surface of the elastic member, the vehicle load is transmitted to the fixing member via the elastic member and the load support member, and is supported by the end portion of the floor slab to which the fixing member is fixed.

  Here, since the load support member is embedded in the elastic member, the elastic member and the load support member are integrated to transmit the vehicle load to the fixed member. Specifically, since the load supporting member is embedded along the lower surface of the elastic member, the shear load and the bending load are effectively transmitted to the fixing member together with the elastic member. Although the load supporting member is not in contact with the fixing member, the load supporting member is embedded in the elastic member, and the both end portions are arranged so as to be along the surface in contact with the elastic member of the fixing member. The load can be transmitted to the fixed member by the adhesion force to the member.

  When the pair of floor slabs are relatively displaced due to, for example, settlement of a pier supporting the floor slab or contraction of the floor slab, the elastic member is deformed. At this time, since the elastic member has a convex cross section in which the central portion of the lower side surface is curved downward, the upper side surface of the elastic member is deformed into a smooth shape without causing an abrupt step. Thereby, since a vehicle running surface continues smoothly between a pair of floor slab end portions, it is possible to prevent inconvenience that a sudden step or a gap is generated between the floor slabs. Therefore, it is possible to effectively prevent the inconvenience of giving vibration to the vehicle due to the abrupt steps and gaps and the noise generated when the vehicle gets over the abrupt steps.

  Furthermore, since the flexible load support member is embedded in the elastic member and the load support member is not in contact with the fixed member, the load support member and the elastic member are deformed integrally. Accordingly, it is possible to prevent a disadvantage that a gap is generated between the plurality of members due to the deformation as in the conventional case. As a result, it is possible to prevent the inconvenience that the gap between the members is compressed as the vehicle travels and noise is generated. In addition, repeated compression of the gaps between the members can prevent inconvenience that the members are damaged due to wear, fatigue, or the like, and sufficient durability can be obtained.

  In addition, the telescopic device of the present invention transmits the vehicle load to the fixed member by the elastic member and the load supporting member, and the load supporting member is not in contact with the fixed member. It can be simplified. Therefore, the telescopic device of the present invention can be manufactured in advance at a factory or the like, and it is not necessary to assemble at the site as in the prior art, so that the telescopic device can be manufactured at low cost. Moreover, the joint construction cost using this expansion-contraction apparatus can be reduced, and joint construction cost can be reduced.

  The telescopic device of the present invention can be installed on a vertical joint formed substantially parallel to the traveling direction of the vehicle on the floor slab, and is formed substantially perpendicular to the traveling direction of the vehicle on the floor slab. It can also be installed at a horizontal joint.

  In the expansion / contraction apparatus according to an embodiment, the load support member is formed of at least one of a linear body, a strip-shaped body, a plate-shaped body, and a cloth-shaped body.

  According to the embodiment, an adhesion force can be effectively obtained between the load support member and the elastic member, and a load acting on the upper surface of the elastic member can be effectively transmitted to the fixing member. . Even when a relative displacement occurs between the pair of floor slabs, the load supporting member can be deformed integrally with the elastic member, so that the vehicle load can be stably transmitted to the fixed member. In addition, good durability can be obtained without a gap between the members.

  In the telescopic device according to an embodiment, both ends of the load support member are arranged so as to overlap the fixing member in plan view.

  According to the embodiment, the shear force in the vertical direction is effectively transmitted from the both ends of the load support member to the fixing member via the elastic member positioned between the load support member and the fixing member. Can do. Therefore, the load of the vehicle on the elastic member can be effectively supported by the fixing member.

In the telescopic device according to an embodiment, the fixing member has an inclined portion extending from the vicinity of the upper side surface of the elastic member at an inclination angle.
Both end portions of the load support member are disposed along a surface in contact with the elastic member of the inclined portion of the fixed member.

  According to the embodiment, both end portions of the elastic member are fixed to the inclined portion of the fixing member, and both end portions of the load supporting member are arranged along the surface of the inclined portion that contacts the elastic member. Thus, the load supporting member and the fixing member can be sufficiently overlapped in plan view, and the shear load and the bending load can be effectively transmitted from the load supporting member to the fixing member.

  In addition, when this expansion / contraction device is installed on the floor slab, when a filler such as mortar is filled between the floor slab and the fixing member in order to fix the fixing member to the floor slab, along with the filling of the filler Since air can escape along the surface of the inclined portion on the floor slab side, it is possible to prevent the inconvenience of generating voids in the filler.

  In the telescopic device according to one embodiment, the fixing member embedded in the floor slab is fixed to the side opposite to the side where the elastic member of the inclined portion of the fixing member is fixed.

  According to the embodiment, the fixing member can be firmly fixed to the floor slab by the fixing member. Here, as the fixing member, for example, a rod-shaped reinforcing bar or a plate-shaped anchor plate can be used. The fixing member is preferably arranged so as to overlap with a load supporting member arranged along a surface in contact with the elastic member of the inclined portion in plan view. Thereby, the load transmitted to the fixing member via the load supporting member can be effectively dispersed on the floor slab via the fixing member. Therefore, it is possible to prevent the inconvenience that the load is unbalanced between the fixing member and the floor slab, and to further improve the durability of the expansion device.

  In one embodiment, the elastic member is formed of natural rubber or synthetic rubber, and the load support member is formed of a steel wire bundled in a band shape.

  According to the above embodiment, since sufficient adhesive force can be obtained between the elastic member and the load support member, the shear load and the bending load that accompany the vehicle traveling on the upper side surface of the elastic member, It can be effectively transmitted to the fixing member. In addition, since a sufficient adhesion force can be obtained between the elastic member and the load supporting member, even when a relative displacement occurs between the floor slabs, the elastic member and the load supporting member are integrated without generating a gap. Can be transformed into Therefore, it is possible to effectively prevent the generation of noise and breakage of members as in the prior art, and to obtain a low noise and high durability expansion / contraction device.

  In addition, since the load support member formed of the steel wire is embedded in the elastic member formed of the natural rubber or the synthetic rubber, the load support member can be effectively prevented from being deteriorated, and Durability can be improved effectively.

In the elastic device of one embodiment, the elastic member is formed such that the upper side surface is flat and the thickness of the central part is larger than the thickness of both end parts,
Provided on the upper surface of the elastic member are a plurality of anti-slip members having an elastic base and a plurality of hard particles carried on the surface portion of the elastic base and fixed at least spaced apart from each other in the width direction. .

  According to the above embodiment, the hard particles of the non-slip member fixed to the upper side surface of the elastic member generate a frictional resistance against the tire of the traveling vehicle and exhibit an anti-slip effect. Here, since the elastic member has a larger thickness at the center than at both ends, the deformation of the center is relatively small when the elastic member is deformed along with the relative displacement of the pair of floor slabs. Furthermore, since the anti-slip member is fixed to the upper side surface of the elastic member at a distance from each other in the width direction, the amount of deformation accompanying the deformation of the elastic member is less than that formed continuously in the width direction. Few. As a result, the stress generated on the elastic base of the anti-slip member is effectively reduced, so that the hard particles carried on the surface of the elastic base are less likely to fall off, resulting in good durability even after deformation. A telescopic device having the properties can be obtained.

  In one embodiment, the hardness of the elastic base of the anti-slip member is greater than the hardness of the elastic member.

  According to the above embodiment, when the elastic member is deformed with relative displacement between the floor slabs, the deformation amount of the elastic base fixed to the upper side surface of the elastic member can be effectively reduced. Accordingly, it is possible to prevent the hard particles carried on the surface of the elastic substrate from falling off.

  As described above, according to the present invention, the flexible load support member is embedded along the lower side surface of the elastic member in the elastic member whose fixing members are fixed at both ends and whose upper side surface is the vehicle running surface. In addition, since both ends of the load support member are arranged so as to be along a surface in contact with the elastic member of the fixing member in a non-contact state with the fixing member, the load acting on the elastic member Can be transmitted to the fixing member with a simple structure with a small number of parts, and even if relative displacement occurs between the pair of floor slabs to which the pair of fixing members are fixed, there is no gap between the parts and low noise. In addition, a highly durable expansion device can be obtained.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(First embodiment)
FIG. 1 is a cross-sectional view in the width direction showing a joint structure in which the expansion / contraction device according to the first embodiment of the present invention is installed, and FIG. FIG. 3 is a plan view showing the telescopic device of the present embodiment.

  The telescopic device 1 of the first embodiment is installed between floor slabs 21 and 31 of two road bridges 2 and 3 constructed in parallel, and is formed in an extending direction between the floor slabs 21 and 31. It is installed in the vertical joint. The telescopic device 1 includes fixing members 11 and 11 fixed to end portions of a pair of floor slabs 21 and 31 facing each other at a distance, and elastic members having both end portions fixed to the pair of fixing members 11 and 11. A member 13 and a flexible load support member 14 embedded in the lower portion of the elastic member 13 are provided. The expansion / contraction apparatus 1 of this embodiment has a width of 560 mm, and is installed so as to span a separation of 230 mm formed between the floor slabs 21 and 31.

  The fixing member 11 is formed of a bent steel plate, and forms a tapered cross section whose width decreases as it goes downward while the pair of fixing members 11 are fixed to the elastic member 13. Specifically, the fixing member 11 is connected to the upper end vertical portion 11a extending vertically downward along the side surface from the edge of the upper side surface of the elastic member 13, and the lower end of the vertical portion 11a, and the width of the elastic member 13 as it goes downward. The inclined portion 11b is inclined toward the inner side in the direction, and the lower end vertical portion 11c is connected to the lower end portion of the inclined portion 11b and extends vertically downward. The inner surface of the fixing member 11 is fixed to the outer surface of the end portion of the elastic member 13 with an adhesive.

  An anchor reinforcing bar 16 as a fixing member is fixed to the inclined portion 11 b of the fixing member 11. The anchor reinforcing bar 16 is formed of a deformed reinforcing bar, and one end thereof is fixed to the upper portion of the inclined portion 11b by welding, and extends horizontally at a substantially right angle to the vertical portion 11a. The other end portion of the anchor reinforcing bar 16 is bent downward and formed into a bowl shape.

  An anchor plate 17 as a further fixing member is fixed to the inclined portion 11 b and the lower end vertical portion 11 c of the fixing member 11. The anchor plate 17 is formed of a wide, generally L-shaped steel plate, has a width substantially the same as the width of the inclined portion 11b of the fixing member 11, and extends to the vicinity of the lower end of the lower end vertical portion 11c. It has a trapezoidal portion 17a and a horizontal portion 17b extending outward in the width direction from the side surface of the lower end portion of the trapezoidal portion.

  As shown in FIG. 3, the anchor reinforcing bars 16 and the anchor plates 17 are alternately arranged in parallel with each other and in the extending direction of the vertical joints. Further, the anchor reinforcing bars 16 and the anchor plates 17 fixed to the respective fixing members 11 are arranged at the same position in the vertical joint direction between the pair of fixing members 11. That is, the anchor reinforcing bars 16 are arranged in a straight line on the pair of fixing members 11 in a plan view, and the anchor plate 17 is also arranged in a straight line on the pair of fixing members 11 in a plan view.

  The elastic member 13 is formed of a lump of chloroprene rubber, and the upper side surface is formed horizontally, while the central part of the lower side surface is formed in a convex shape curved downward. Specifically, the lower surface of the elastic member 13 is formed of an inclined surface arranged symmetrically in the width direction of the vertical joint, the width becomes narrower toward the lower side, and the bottom end is connected to the joint in a ridge shape. It has a roof-like shape. Side surfaces on both sides in the width direction of the elastic member 13 are formed by planes extending substantially vertically. The elastic member 13 is set to a hardness of 45 degrees or more and 55 degrees or less according to a measurement method defined in JIS K6253 type A.

  The upper surface of the elastic member 13 is a vehicle running surface, and is provided with a lattice-like groove 13a for preventing slipping. In addition, the groove | channel for anti-slip | skid may be other shapes, such as parallel line shape and dot shape. Further, an anti-slip member such as a ridge or hard particles may be provided on the upper side surface of the elastic member 13.

  The elastic member 13 has a width of 542 mm, the thickness at both ends is 35 mm, and the largest central thickness is 156 mm.

  The load support member 14 is embedded in the lower portion of the elastic member 13 so as to span between the pair of fixing members 11, 11 along the lower surface of the elastic member 13. The load support member 14 is formed of a flexible belt-like body, and is formed by arranging a plurality of steel wires in the direction of extension of the vertical joint and bundling them in a belt shape. The load support member 14 can be formed by arranging, for example, 12 2.5 mm diameter steel wires. In the present embodiment, the load support member 14 has a length of 360 mm and is embedded at a depth of 1.5 mm from the lower surface of the elastic member 13. Further, both end portions of the load support member 14 are set so as to be along the inner surface of the fixing member 11 over a length of 130 mm. Thereby, the both ends of the load support member 14 are arranged so as to be along the surface in contact with the elastic member 13 of the fixing member 11 in a non-contact state with the fixing member 11. Here, in FIG. 2, the depth in which the load supporting member 14 is embedded from the lower side surface of the elastic member 13 is indicated by d, and the length along which the both ends of the load supporting member 14 extend along the inner side surface of the fixing member 11 is indicated. L indicates.

  FIG. 4 is a plan view showing the position of the load support member 14 in the elastic member 13 by a solid line. As shown in FIG. 4, the load supporting member 14 is disposed so as to overlap with the anchor reinforcing bar 16 and the anchor plate 17 that are respectively fixed to the pair of fixing members 11 in a plan view. That is, both ends of the load support member 14 overlap with ends of the pair of anchor reinforcing bars 16, 16 that are arranged in a straight line with the pair of fixing members 11, 11. Further, both end portions of the load support member 14 overlap with end portions of the pair of anchor plates 17, 17 that are arranged in a straight line with the pair of fixing members 11, 11. Thereby, the bending load and the shear load generated in the elastic member 13 are efficiently transmitted to the fixing member 11.

  The load support member 14 may be a belt-like body formed by knitting a wire or a steel wire. Further, the load supporting member 14 may be a linear body such as a wire or a steel wire that is evenly arranged in the extending direction of the vertical joints in addition to the strip-shaped body. Alternatively, the load support member 14 may be a cloth-like body formed by knitting a wire or a steel wire.

  The telescopic device 1 of this embodiment is manufactured as follows. First, the steel plate is bent using a press to form the fixed member 11 having a predetermined shape. Thereafter, the anchor rebar 16 is fixed to the outer surface of the inclined portion 11b of the fixing member 11 by full-length fillet welding. Further, the anchor plate 17 is fixed to the inclined portion 11b and the lower end vertical portion 11c of the fixing member 11 by fillet welding. Subsequently, sandblasting is performed on the inner surface of the fixing member 11 to remove and clean rust and deposits on the adhesive surface with the elastic member 13, and the surface is roughened to increase the adhesive force. . Thereafter, a chloroprene-based vulcanized adhesive is applied to the inner surface of the fixing member 11. The vulcanized adhesive preferably contains a compounding agent such as carbon, silica and titanium oxide. Other vulcanized adhesives may be used depending on the material of the elastic member 13.

  Further, an unvulcanized rubber sheet as a material of the elastic member 13 is prepared by adding various compounding agents to chloroprene and kneading and molding the sheet into a sheet shape.

  Further, a wire as a material of the load support member 14 is cut into a predetermined length, and after applying a chloroprene adhesive to the wire, the wire is surrounded by the chloroprene layer 142 same as the rubber sheet for the elastic member 13. By winding, a preform (hereinafter referred to as a load support preform) 141 of the load support member 14 as schematically shown in FIG. 5 is formed. The load supporting member preform 141 is formed by winding 12 wires 14 with a chloroprene layer 142. The chloroprene layer 142 is arranged so that the thickness d from the surface to the outer peripheral surface of the wire 14 is 1.5 to 2.0 mm, which is substantially the same as the embedding depth in the elastic member 13. Thus, by forming the load supporting preform 141, it can be easily installed in a mold described later.

  After preparing the fixing member 11, the rubber sheet for the elastic member 13, and the load supporting preform 141, these materials are put into a mold. In the mold, a cavity is formed by a lower mold and an upper mold, and an insert mold that pressurizes and heats the rubber sheet and the load supporting preform 141 while the fixing member 11 is accommodated in the cavity. It is. In the lower mold, the bottom surface of the recess forming the cavity is formed by two inclined surfaces that are continuous with each other at the center portion, and the center portion of the bottom surface is formed deepest. That is, the bottom surface of the concave portion of the lower mold forms a convex surface of the elastic member 13. In the upper mold, the top surface of the recess that forms the cavity is formed as a flat surface. The lower mold and the upper mold are provided with a heating device for heating the inside of the cavity with an electric resistance or a heat medium.

The material is put into the concave portion of the lower mold so as to have the same arrangement as the vertical arrangement of the parts when the telescopic device 1 is used. First, a pair of fixing members 11 and 11 are installed in the recess of the lower mold 51, and a plurality of loads are formed between the fixing members 11 and 11 along the bottom surface of the cavity as shown in FIG. The support preforms 141 are arranged in parallel to each other. When the thickness of the chloroprene layer 142 of the load supporting preform 141 is smaller than the embedment depth of the wire in the elastic member 13, a predetermined number of rubber sheets are laid on the cavity bottom surface in advance. Next, a plurality of unvulcanized rubber sheets 131, 131,... Are laminated on the load supporting preform 141 as shown in FIG. An additive, a vulcanizing agent, or the like is disposed between the surface of the load supporting preform 141 and the plurality of rubber sheets. When the introduction of the material into the recess of the lower mold 51 is completed, as shown in FIG. 6C, the upper mold 52 is pressed to pressurize the material, and the heating incorporated in the molds 51 and 52 is performed. The material is heated by the device. The pressing force is set to 0.5 to 1.0 N / mm ² and the heating temperature by the heating device is set to around 150 ° C. As a result, the plurality of unvulcanized rubber sheets 131 and the chloroprene layer 142 are vulcanized and integrated, and molded to form the elastic member 13. Further, the fixing member 11 and the elastic member 13 are vulcanized and bonded, and the chloroprene layer 142 and the wire 14 are vulcanized and bonded.

  Thereafter, the fixing member 11, the elastic member 13, and the load supporting member (wire) 14 are taken out from the mold, and a groove 13a is formed on the upper surface of the elastic member 13 as shown in FIG. Is completed. The groove 13a of the elastic member 13 may be formed by providing a protrusion having an inverted shape of the groove on the upper mold 52 and pressing the unvulcanized rubber sheet 131 corresponding to the upper surface of the elastic member 13 with this protrusion. Good.

  The telescopic device 1 manufactured as described above is installed on the floor slabs 21 and 31 of the road bridges 2 and 3 as follows.

  First, the opposite edge portions of the floor slabs 21 and 31 are removed by a chiseling process to form step portions 23 and 33 lower than the surfaces of the paving materials 22 and 32. As a result, the fixing bars 25 extending from the steel plate provided on the lower surface of one floor slab 21 are exposed. The other floor slab 31 has anchor bars 35 embedded in the surface of the stepped portion 33. Thereafter, the expansion and contraction device 1 is installed so as to span the separation of the floor slabs 21 and 31, and is adjusted so that the upper surface of the elastic member 13 is at the same level as the surfaces of the pavement materials 22 and 32. Thereafter, the anchor reinforcing bar 16 and the anchor plate 17 of one fixing member 11 are temporarily fixed to the fixing bar 25 of one floor slab 21. The reinforcing bars 16 and the anchor bars 17 and the penetration bars 26 perpendicular to the fixing bars 25 are arranged in the temporary fastening portion. Further, the anchor reinforcing bar 16 and the anchor plate 17 of the other fixing member 11 are temporarily fixed to the anchor bar 35 of the other floor slab 31. The reinforcing bars 16 and the anchor plates 17 and the through bars 36 that are orthogonal to the anchor bars 35 are disposed in the temporary fastening portion.

  Thereafter, a formwork is installed between the lower side surfaces of the step portions 23, 33 of the floor slabs 21, 31 and the lower ends of the bottom vertical portions 11 c, 11 c of the pair of fixing members 11, 11. , 31 is placed on the step portions 23, 33, and the post-cast concrete 24, 34 is formed outside the fixing members 11, 11 of the step portions 23, 33. After the post-cast concrete 24, 34 is hardened, the formwork is removed, and the installation of the expansion device 1 is completed.

  Thus, since the expansion / contraction apparatus 1 of this embodiment can be manufactured in a factory, the highly accurate expansion / contraction apparatus 1 can be manufactured efficiently. In particular, the elastic member 13 can be firmly fixed to the fixing members 11 and 11 by vulcanization adhesion, and the load supporting member 14 can be firmly attached and embedded in the elastic member 13. Therefore, even if the elastic member 13 is deformed by the relative displacement of the floor slabs 21 and 31 as will be described later, the problem that a gap is generated between the elastic member 13 and the fixing members 11 and 11 and the load support member 14 is effectively obtained. Can be prevented. Moreover, since it is not necessary to assemble the expansion / contraction apparatus 1 at the site, the installation work of the expansion / contraction apparatus 1 can be simplified as compared with the prior art, the construction period can be shortened, and the construction cost can be reduced.

  When relative displacement occurs in the floor slabs 21, 31 due to subsidence of the road bridges 2, 3 or contraction of the floor slabs 21, 31, the elastic member 13 of the telescopic device 1 is deformed to absorb the relative displacement. . At this time, the deformation generated in the expansion / contraction device 1 was reproduced by experiments, and the states of the elastic member 13 and the load support member 14 during the deformation were observed to confirm the durability of the expansion / contraction device 1. Further, the load state when the large vehicle travels on the upper side surface of the elastic member 13 of the expansion / contraction device 1 is reproduced by experiments, the deformation amount of the elastic member 13 is measured, and the elastic member 13 and the load support member 14 at the time of deformation are measured. I observed the situation. Furthermore, the adhesion force obtained between the elastic member 13 and the load support member 14 is calculated using a test body made of the same material as the elastic member 13 and the load support member 14, and a load acts on the elastic member 13. It was confirmed whether or not the adhesion between the elastic member 13 and the load supporting member 14 was ensured.

  The dimensions of the telescopic device 1 to be tested are such that the width of the upper end vertical portions 11c and 11c of the pair of fixing members 11 is 560 mm, and the height from the upper end to the lower end of the fixing member 11 is 170 mm. The width of the elastic member 13 is 542 mm, the thickness of both ends of the elastic member 13 is 35 mm, and the thickness of the center of the elastic member 13 is 156 mm. The load support member 14 is a belt-like body formed by arranging 12 steel wires having a diameter of 2.5 mm, and 9 are arranged at a pitch of 100 mm in the depth direction. The load support member 14 has a length of 360 mm, and is embedded at a depth of 1.5 mm from the lower surface of the elastic member 13. Further, both end portions of the load supporting member 14 are along the inner surface of the fixing member 11 over a length of 130 mm. The depth dimension of the fixing member 11 and the elastic member 13 is 900 mm. All experiments were performed in a temperature environment of −10 ° C., 20 ° C., and 50 ° C.

(Vertical displacement experiment)
Assuming that the floor slabs 21 and 31 are relatively displaced in the vertical direction, a vertical displacement of 50 mm is given between the two fixing members 11 and 11 using a hydraulic press machine. Specifically, a jig was fixed to the inclined portions 11b of the two fixing members 11, and the lower surface of the jig was supported by a support block having a height difference of 50 mm. A pressure block with a height of 50 mm is placed on one jig supported by a support block having a low height, and a vertical downward force is applied to the pressure block with a press head. Pressurization was performed until it contacted the tool. The pressure applied by the press head was about 9 t. Thus, when one fixing member 11 was displaced 50 mm vertically downward with respect to the other fixing member 11, the upper surface of the elastic member 13 was deformed with a gentle S-shape in cross section. Abnormalities such as peeling did not occur at the bonded portion between the member 11 and the elastic member 13. In addition, there was no abnormality such as peeling between the elastic member 13 and the load supporting member 14 or a crack in the elastic member 13. These abnormalities did not occur in any temperature environment of −10 ° C., 20 ° C. and 50 ° C.

(Horizontal displacement experiment)
Assuming that the floor slabs 21 and 31 are relatively displaced in the horizontal direction, a horizontal relative displacement of 20 mm is applied between the two fixing members 11 and 11 using a hydraulic press. Specifically, the telescopic device 1 is placed upright on a stage of a hydraulic press machine in which the press head is driven in the vertical direction so that the depth direction of the expansion device 1 is directed in the vertical direction. A support block having a height of 20 mm was arranged at the stage-side end of the other fixing member 11 out of the pair of fixing members 11 of the upright body extension device 1. Further, a pressure block having a height of 20 mm was disposed at the end of the one fixing member 11 on the press head side. A vertical downward force was applied to the pressure block with a press head, and pressure was applied until the stage-side end of one fixing member 11 contacted the stage. The pressure applied by the press head was about 4.7 t. In this way, when one fixing member 11 is displaced 20 mm vertically downward (horizontal direction in a normal use state) with respect to the other fixing member 11, the upper side surface (vehicle traveling surface) of the elastic member 13 is legal. Although deformed into a parallelogram when viewed from the line direction side, no abnormality such as peeling occurred at the bonding portion between the fixing member 11 and the elastic member 13. In addition, there was no abnormality such as peeling between the elastic member 13 and the load supporting member 14 or a crack in the elastic member 13. These abnormalities did not occur in any temperature environment.

(Load experiment)
Assuming a case where a large vehicle travels on the upper surface of the elastic member 13 of the telescopic device 1, a load of 14 t was applied to the upper surface of the elastic member 13 using a hydraulic press. Specifically, jigs are respectively fixed to the inclined portions 11b of the two fixing members 11, the two jigs are horizontally arranged on the stage of the hydraulic press machine, and the upper surface of the elastic member 13 is directed to the stage. Parallel. A pressure block having a width dimension of 200 mm and a depth dimension of 500 mm is arranged at the center of the upper surface of the elastic member 13 in the width direction, and a downward force of about 14 t is applied to the pressure block by a press head. It was. This load condition is based on the T load described in the Road Bridge Specification and Explanation (issued by the Japan Road Association), and the load acting from the rear wheel of the 25t vehicle is 10t. Since the elastic member 13 is a rubber material, the impact load of 40% is added. In this way, when a load corresponding to the load received from the rear wheel of the large vehicle was applied, the amount of deflection of the central portion of the elastic member 13 was 20 mm or less in any temperature environment. Further, no abnormality such as peeling occurred at the bonding portion between the fixing member 11 and the elastic member 13 with the bending. In addition, there was no abnormality such as peeling between the elastic member 13 and the load supporting member 14 or a crack in the elastic member 13. These abnormalities did not occur in any temperature environment.

(Adhesion test)
The adhesion force obtained between the elastic member 13 and the load support member 14 was measured using a test body formed of the same material as the elastic member 13 and the load support member 14. The test body was formed of a rubber piece formed using the same chloroprene rubber as the material of the elastic member 13 and three wires partially embedded so as to penetrate the rubber piece. The rubber piece is a rectangular parallelepiped having a side of 50 mm, and three wires are embedded in the same plane in parallel with the side of 50 mm. That is, a fixing length of 50 mm is set between the rubber piece and each wire. The wire is a steel wire having a diameter of 2.5 mm. Tensile forces opposite to each other were applied between two wires on both sides of the three wires and one central wire, and the force value was measured while gradually increasing the tensile force. The maximum value of the adhesive force was determined when the tensile force gradually decreased after increasing gradually. As a result of performing this experiment twice, the maximum tensile force applied to one wire was 367 kg and 336 kg in each experiment. If these values are averaged, the maximum value of the adhesion force between the rubber piece and the wire is 352 kg with respect to the adhesion length of 50 mm.

  In the telescopic device 1 of the present embodiment, a single belt-shaped load support member 14 is formed with 12 wires, and the load support members 14 are arranged at intervals of 100 mm. The load support member 14 extends along the inner surface of the inclined portion 11b of the fixing member 11 over a length of 130 mm. Therefore, it can be said that the adhesive force that can be reliably ensured between the single load supporting member 14 and the elastic member 13 is 11 t from the result of the above-described adhesive force experiment. Here, assuming that the above-described T load acts on the telescopic device 1, the separation formed between the lower end vertical portions 11c of the pair of fixing members 11 is 230 mm, and the T load extends over the entire width of this separation. When the force acts, the maximum tensile force is generated in the load support member 14. Since the pitch of the load support members 14 is 100 mm, the tensile force is 3.3 t per load support member 14. Since the adhesive force that can be surely secured between one load support member 14 and the elastic member 13 is 11 t, even when a large vehicle passes, the elastic member 13 and the load support member 14 have a large margin. The adhesion state between can be kept.

  As described above, according to the telescopic device 1 of the present embodiment, the elastic member 13 formed of a rubber material, and the load support member that is embedded in the elastic member 13 and formed by bundling steel wires in a band shape. 14, the load of the vehicle passing through the upper side surface of the elastic member 13 can be transmitted to the fixing member 11. Moreover, the load supporting member 14 is embedded in the elastic member 13 and arranged along the inner side surface of the inclined portion 11b of the fixing member 11 in spite of the non-contact state with the fixing member 11. Therefore, the load can be transmitted to the fixing member 11 by the adhesive force between the load support member 14 and the elastic member 13. Therefore, the telescopic device 1 can be greatly simplified in structure as compared with the conventional one, can be manufactured in a factory, can reduce joint man-hours, shorten the work period, and reduce the construction cost.

  Further, when relative displacement occurs between the pair of floor slabs 21 and 31, the elastic member 13 has a convex cross section in which the central portion of the lower side surface is curved downward, so that the upper side surface of the elastic member 13 after deformation is smooth. It can be shaped. Accordingly, it is possible to effectively prevent inconvenience that the vehicle traveling on the upper surface of the elastic member 13 is vibrated by a sudden step or a gap, and noise generated when the vehicle gets over the sudden step. Further, since the flexible load support member 14 is embedded in the elastic member 13 and the load support member 14 is not in contact with the fixed member 11, the load support member 14 and the elastic member 13 are deformed integrally. can do. Therefore, unlike the prior art, there is no gap between the plurality of members as a result of deformation. Therefore, it is possible to reliably prevent the inconvenience that the gap between the members is compressed as the vehicle travels and noise is generated. Further, by repeatedly compressing the gaps between the members, it is possible to prevent the members from being damaged due to wear or fatigue. As described above, according to the telescopic device 1 of the present embodiment, it is possible to effectively reduce the noise associated with the traveling of the vehicle even after deformation, and to obtain sufficient durability.

(Second Embodiment)
FIG. 7 is a cross-sectional view showing a telescopic device according to a second embodiment of the present invention. The telescopic device 101 has a plurality of anti-slip members 18 on the upper surface of the elastic member 13 and the drainage groove 19 is provided between the plurality of anti-slip members 18 as in the first embodiment. It has the same configuration. The same parts as those of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

In the expansion device 101 of the second embodiment, rectangular antiskid members 18, 18,... In a plan view are arranged in a tile shape on the upper surface of the elastic member 13 in an orthogonal matrix. FIG. 8 is an enlarged sectional view of the anti-slip member 18. The anti-slip member 18 has an elastic base 81, which is formed of substantially the same chloroprene rubber as that of the elastic member 13 and to which the same compounding agent is added. The elastic substrate 81 is formed of a plate-like body having a width of 90 mm, a length of 190 mm, and a thickness of 20 mm. A plurality of hard particles 82 are carried on the surface portion of the elastic substrate 81. One hard particle 82 is carried in the thickness direction of the elastic substrate 81, and has a depth of 1.0 mm to 5.0 mm from the surface of the elastic substrate 81, preferably 2.0 mm to 3.3 mm. It is supported at the following depth. The hard particles 82 partially protrude from the surface of the elastic substrate 81, and the height of the protruding portion is set to 20 to 50% of the particle size. Here, if the height of the protruding portion is less than 20 of the particle size, the length of the hard particles 82 biting into the vehicle tire is insufficient, and the anti-slip effect is insufficient. On the other hand, if the height of the protruding portion exceeds 50% of the particle diameter, the area where the hard particles 82 adhere to the elastic substrate 81 becomes too small and the hard particles 82 are likely to fall off. The hard particles 82 are supported at a density of 0.1 g / cm ² or more and 0.5 g / cm ² or less per unit surface area of the elastic substrate 81. As a result, an anti-slip effect can be appropriately obtained, and the hard particles 82 can be firmly fixed to the elastic substrate 81. Here, when the density of the hard particles 82 is less than 0.1 g / cm ² , the anti-slip effect is insufficient, and when the density of the hard particles 82 exceeds 0.5 g / cm ² , the degree of contact between the hard particles 82 is increased. It becomes large and the fixation of the hard particles 82 to the elastic substrate 81 becomes insufficient.

  Similar to the elastic member 13, the elastic base member 81 is set to a hardness of 45 degrees or more and 55 degrees or less. The back surface of the elastic base member 81 of the anti-slip member 18 is vulcanized and bonded to the upper surface of the elastic member 13.

  The hard particles 82 of the anti-slip member 18 are made of a ceramic containing iron oxide as a main component and magnesium or aluminum oxide. In addition, as a ceramic, you may use what consists of silicon carbide or an alumina. In addition to ceramics, hard particles may be formed of cinnabar sand, glass pieces, ceramic pieces, and the like. The hard particles 82 have an indefinite shape and a particle size of 1.0 mm or greater and 5.0 mm or less. Here, when the particle size of the hard particles 82 is smaller than 1.0 mm, the anti-slip effect is insufficient. On the other hand, if the particle size of the hard particles 82 exceeds 5.0 mm, there is a risk of damage to the tires of the vehicle, vibration or noise associated with vehicle travel, and one elastic substrate with a suitable density in the thickness direction. It becomes difficult to carry. In particular, the particle size of the hard particles 82 is 2.0 mm or more and 3.3 mm or less, which is preferable in terms of achieving both an anti-slip effect and a tire damage, noise and vibration prevention effect.

  The hard particles 82 of the anti-slip member 18 are fixed to the elastic substrate 81 by vulcanization adhesion. For the vulcanization adhesion between the hard particles 82 and the elastic substrate 81, a polyolefin adhesive to which carbon and zinc oxide are added can be used. As the adhesive, other known adhesives can also be used.

  The drainage groove 19 formed between the plurality of anti-slip members 18, 18,... Has vertical grooves 19a, 19b extending in the joint direction and lateral grooves extending in the joint perpendicular direction. Of the longitudinal grooves 19a and 19b, the longitudinal groove 19a located at substantially the same width direction position as the lower end vertical portion 11c of the fixing member 11 is formed deeper than the other longitudinal grooves 19b. In the present embodiment, the depth of the shallow vertical groove 19b is set to about 20 mm, while the depth of the deep vertical groove 19a is set to about 30 mm. The shallow vertical groove 19b has the bottom surface of the upper surface of the elastic member 13, while the deep vertical groove 19a has the bottom surface of the cutting groove formed by cutting the upper portion of the elastic member 13.

  The telescopic device 101 of the second embodiment is manufactured as follows.

  First, the member which comprises the expansion-contraction apparatus 1 is created as a preparation stage. That is, as in the first embodiment, a fixing member 11 having a predetermined shape is created, and the anchor reinforcing bar 16 and the anchor plate 17 are fixed to the fixing member 11. Subsequently, sandblasting is performed on the inner surface of the fixing member 11. Thereafter, a chloroprene-based vulcanized adhesive is applied to the inner surface of the fixing member 11.

  Further, an unvulcanized rubber sheet as a material of the elastic member 13 is prepared by adding various compounding agents to chloroprene, kneading, and forming into a sheet shape.

  Further, the material of the elastic base member 81 of the anti-slip member 18 is prepared by adding various compounding agents to chloroprene and kneading and molding the material into a thin rectangular parallelepiped block shape. As shown in FIG. 9A, hard particles 82 made of ceramic are dispersed on the surface of the elastic base material 181. A polyolefin adhesive to which additives such as carbon and zinc oxide are added is applied in advance to the surface of the hard particles 82. Note that other additives can be used for the adhesive applied to the hard particles 82, and various adhesives can be used depending on the material of the elastic base material 181 and the hard particles 82. Subsequently, the hard particles 82 are pressurized by a plate-like press body, and substantially all of the elastic particles 82 are buried in the elastic base material 181 as shown in FIG. 9B. In this way, the elastic base material 181 carries the hard particles 82 to form a non-slip member preform (hereinafter referred to as an anti-slip preform) 182.

  After the fixing member 11, the unvulcanized rubber sheet for the elastic member 13, and the anti-slip preform 182 are formed, the members are fixed to each other using a press machine and the rubber material is vulcanized. The mold of the press machine includes a lower mold and an upper mold, and a cavity is formed therein, and a fixed member 11 is accommodated in the cavity, and an unvulcanized rubber sheet, an anti-slip preform 182 and a load This is an insert mold for pressurizing and heating the support preform 141. In the lower mold, the bottom surface of the recess forming the cavity is formed as a flat surface, while in the upper mold, the top surface of the recess forming the cavity is formed by two inclined surfaces. It is formed so as to be molded in the opposite direction to the state. The lower mold and the upper mold are provided with a heating device for heating the inside of the cavity with an electric resistance or a heat medium.

First, as shown in FIG. 9C, a plurality of anti-slip preforms 182 are arranged in an orthogonal matrix on the bottom surface 151a of the lower mold 151. The preform 182 is disposed such that the surface on the side of supporting the hard particles 82 is in contact with the bottom surface 151a of the cavity. Subsequently, after applying a vulcanized adhesive to the back surface of the preform 182, the unvulcanized rubber sheets 131 for the plurality of elastic members 13 are arranged in layers on the preform 182. A vulcanized adhesive is applied between the plurality of unvulcanized rubber sheets 131, 131,. Thereafter, as shown in FIG. 9D, a plurality of load supporting preforms 141 are arranged in parallel to each other on the unvulcanized rubber sheets 131, 131,. A vulcanized adhesive is applied between the outermost surface of the unvulcanized rubber sheets 131, 131, ... and the plurality of load supporting preforms 141. Next, as shown in FIG. 9E, the upper mold 152 on which the fixing member 11 is set is press-driven toward the lower mold 151 to perform mold clamping, and heating by a heating device is performed. The pressurizing force accompanying mold clamping is set to 0.5 to 1.0 N / mm ^2, and the heating temperature by the heating device is set to around 150 ° C. The unvulcanized rubber sheet 131, the elastic base material 181 and the chloroprene layer 142 are vulcanized by pressurization and heating by the molds 151 and 152, and a plurality of unvulcanized rubber sheets 131 and the chloroprene layer 142 are integrally molded. Thus, the elastic member 13 is formed. Further, vulcanization adhesion between the unvulcanized rubber sheet 131 and the elastic base material 181 is performed, and vulcanization adhesion between the elastic base material 181 and the hard particles 82 is performed. Further, vulcanization adhesion between the fixing member 11 and the elastic member 13 and vulcanization adhesion between the chloroprene layer 142 and the wire 14 are performed. Here, since the anti-slip preform 182 is disposed so that the surface thereof is in contact with the bottom surface 151a of the lower mold, the hard particles 82 are moved downward by gravity in the elastic base material 181 that has been heated and softened. The hard particles 82 can be uniformly arranged on the surface of the elastic base material 181.

  After pressing and heating by the molds 151 and 152 for a predetermined time, the upper mold 152 is moved away from the lower mold 151 to open the mold, and the elastic base 81, the elastic member 13 and the load in which the hard particles 82 are embedded. The integral structure of the support member (wire) 14 is taken out from the lower mold 151. Thereafter, as shown in FIG. 9 (f), a part of the hard particles 82 is exposed on the surface of the elastic base 81 by removing the surface layer of the elastic base 81 of the integral structure with the rotating wire brush 55. . In addition to the wire brush 55, a resin brush or the like can be used to remove the surface layer of the elastic substrate. Thereafter, the space between the elastic bases 81 is cut to form the vertical grooves 19a and 19b and the horizontal grooves with the side surfaces of the elastic bases 81 as inner wall surfaces and the upper side surfaces (cutting surfaces) of the elastic members 13 as bottoms. Thus, the telescopic device 101 is completed. The longitudinal grooves 19a and 19b and the lateral grooves of the elastic member 13 are formed by providing protrusions having a reversal shape of the grooves on the lower mold 151, and pressing between the elastic base members 81 and the upper surface of the elastic member 13 with these protrusions. May be.

  The telescopic device 1 manufactured as described above can exhibit a good anti-slip effect on a vehicle moving between the floor slabs 21 and 31 and a vehicle traveling on the upper side. In other words, the hard particles 82 of the anti-slip members 18, 18,... Provided on the surface of the expansion / contraction device 1 can give an appropriate frictional force to the vehicle tire, and exhibit the anti-slip effect of the vehicle tire. be able to. In addition, since a plurality of longitudinal grooves 19a, 19b and lateral grooves are formed between the anti-slip members 18, 18,..., Drainage is quickly performed from the anti-slip member 18 even during rain, and the anti-slip effect is exhibited. can do.

  When relative displacement occurs in the floor slabs 21, 31 due to subsidence of the road bridges 2, 3 or contraction of the floor slabs 21, 31, the elastic member 13 of the telescopic device 1 is deformed to absorb the relative displacement. . At this time, the elastic member 13 has a thickness that the central portion 13b is larger than the both end portions 13c and 13c, so that the deformation amount of the central portion 13b is relatively small. Furthermore, since the elastic base member 81 of the anti-slip member 18 is fixed to the upper side surface of the elastic member 13 at a distance from each other, the amount of deformation is smaller than that of the elastic member 13. As a result, the stress generated in the elastic base member 81 of the anti-slip member 18 is effectively reduced, so that the hard particles 82 are less likely to drop off from the elastic base member 81. As a result, good durability and anti-slip properties can be achieved even after deformation. An effect is obtained.

  Further, since the anti-slip member 18 is formed in a rectangular shape in plan view and arranged in a tile shape in a matrix direction orthogonal to the upper side surface of the elastic member 13, there is no non-slip in the joint direction between the pair of floor slabs 21, 31. Even when the relative displacement in the vertical direction occurs evenly, the stress acting on the boundary between the elastic base 81 and the elastic member 13 of the anti-slip member 18 can be dispersed. Therefore, the deformation amount of the elastic base 81 can be reduced, and the hard particles 82 can be prevented from falling off and the boundary between the elastic member 13 and the elastic base 81 can be prevented from peeling off.

  Further, according to the telescopic device 101 of the present embodiment, the load support member 14 embedded in the elastic member 13 is attached between the load support member 14 and the elastic member 13 in a non-contact state with the fixing member 11. The vehicle load can be transmitted to the fixing member 11 by the applied force.

  The anti-slip member 18 may be formed in various square shapes such as a square, a rhombus, a trapezoid, and a parallelogram other than a rectangle. Further, the anti-slip member 18 does not have to be formed in a square shape, and a frame shape surrounding the rectangular anti-slip member 18 or other shape anti-slip members may be mixed. Moreover, you may mix the rectangular antiskid member from which the vertical and horizontal dimension ratios differ. Further, the non-slip members 18 may be arranged in a staggered manner in which either the rows or the columns are arranged in an orthogonal matrix direction, or alternatively, the anti-slip members 18 are arranged in a mosaic pattern by randomly changing the posture in a plane. You may arrange. Further, the anti-slip member 18 may be formed in a circular shape or a polygonal shape other than a quadrangular shape.

  Further, since the deep vertical grooves 19a, 19a formed deeper than the upper side surface of the elastic member 13 are provided between the anti-slip members 18, the elastic member 13 is deep when the relative displacement between the floor slabs 21, 31 is provided. The amount of deformation of the portion corresponding to the vertical groove 19a increases. In particular, when a vertical relative displacement occurs, the deep vertical groove 19a is located at substantially the same width direction position as the lower end vertical portion 11c of the fixing member 11, so that the elastic member 13 is greatly deformed in the vicinity of the deep vertical groove 19a. To do. Thereby, the deformation amount between the deep vertical grooves 19a, 19a of the elastic member 13 is suppressed, and in particular, the deformation amount of the surface portion of the elastic member 13 is greatly suppressed. As a result, the stress generated in the elastic base member 81 of the anti-slip member 18 is suppressed, the stress concentration between the elastic base member 81 and the hard particles 82 is suppressed, and the falling off of the hard particles 82 can be effectively prevented. The number of deep vertical grooves 19a is not limited to two, but may be one or three or more.

Further, since one hard particle 82 of the anti-slip member 18 is carried in the thickness direction of the elastic base 81, the area of the hard particle 82 in contact with the elastic base 81 can be increased, and the hard particle 82 can be strongly elasticized. 81 can be fixed. As a result, it is possible to prevent the hard particles 82 from falling off, and in particular, it is possible to prevent the hard particles 82 from falling off after the elastic member 13 is deformed. Further, since the hard particles 82 are carried at a density of 0.1 g / cm ² or more and 0.5 g / cm ² or less per unit surface area of the elastic substrate 81, an anti-slip effect can be appropriately obtained, and the elastic substrate 81 can be obtained. Can be securely fixed. Further, since the hard particles 82 of the anti-slip member 18 have a particle size of 1.0 mm or more and 5.0 mm or less, a sufficient anti-slip effect is obtained, and one hard particle 82 is carried on the surface portion of the elastic base 81 in the thickness direction. Can be made. Therefore, even if the elastic member 13 is deformed, the sliding effect can be exhibited stably. Furthermore, since a part of the hard particles 82 protrudes from the surface of the elastic base member 81 at a height of 20 to 50% of the particle size, the hard particles 82 are properly bitten into the vehicle tire and good slipping is achieved. The stopping effect can be exhibited, and even when force is applied from the tire, the hard particles 82 can be fixed to the elastic base member 81 to prevent the dropping.

  Moreover, since the expansion / contraction apparatus 101 of this embodiment can be manufactured in a factory, the highly accurate expansion / contraction apparatus 101 can be manufactured efficiently. Moreover, since it is not necessary to assemble the expansion / contraction apparatus 101 at the site, the installation work of the expansion / contraction apparatus 1 can be simplified as compared with the prior art, the construction period can be shortened, and the construction cost can be reduced.

In order to confirm the anti-slip effect of the expansion device 101, the slip resistance value (BPN) of the surface of the anti-slip member 18 was measured. Slip resistance value is ASTM
In accordance with E-303, the measurement was performed in a wet state using an English-style portable skid resistance tester (slip resistance tester). As a result, it was confirmed that the anti-slip member 18 had an excellent anti-slipping effect with a wet slip resistance value of 62 BPN.

  In the above-described embodiment, the elastic base 81 is set to the same hardness as the elastic member 13, but by setting the hardness of the elastic base 81 to be greater than the hardness of the elastic member 13, the hard member 82 of the anti-slip member 18 is set. Dropout can be further prevented.

  When chloroprene is used as the rubber material of the elastic member 13 and the elastic substrate 81, the compounding agent and the compounding amount compounded in the material of the elastic substrate 81 are different from those of the elastic member 13, and the hardness of the elastic substrate 81 is higher than the hardness of the elastic member. Enlarge. For example, the amount of the vulcanizing agent, vulcanization accelerator or reinforcing agent blended in the material of the elastic substrate 81 is made larger than that of the elastic member 13. Thereby, the hardness of the elastic member 13 is set to 45 degrees or more and 55 degrees or less, while the hardness of the elastic base member 81 is set to 50 degrees or more and 80 degrees or less. Preferably, the hardness of the elastic substrate 81 is 1.1 times or more and 2.0 times or less that of the elastic member 13.

  As described above, by forming the anti-slip member 18 with the elastic base member 81 having a hardness higher than that of the elastic member 13, the falling of the hard particles 82 of the anti-slip member 18 can be reduced. Specifically, when relative displacement occurs between the floor slabs 21, 31, the elastic member 13 is deformed and absorbs the displacement, but the elastic base 81 fixed to the upper surface of the elastic member 13 has a hardness higher than that of the elastic member 13. Therefore, the deformation amount of the elastic base 81 is smaller than the deformation amount of the elastic member 13. In other words, since the hardness of the elastic member 13 is relatively small and the flexibility is high, the vicinity of the fixing position of the elastic base member 81 of the elastic member 13 is restrained by the elastic base member 81, The amount of deformation is smaller than that of the portion. As a result, the amount of deformation of the elastic substrate 81 is reduced, and the stress acting on the bonded portion between the elastic substrate 81 and the hard particles 82 is reduced, so that the hard particles 82 can be effectively prevented from falling off.

  Both the elastic member 13 and the elastic base 81 are made of chloroprene as a rubber material and the hardness of the elastic base 81 is made larger than the hardness of the elastic member 13 by adjusting the amount of the compounding agent. The base body 81 may use different rubber materials.

  Moreover, in the said 1st and 2nd embodiment, although the expansion-contraction apparatus 1,101 has been arrange | positioned in the vertical joint between each floor slab 21,31, the expansion-contraction apparatus 1,101 is in the extension direction of each floor slab 21,31. You may arrange | position to the horizontal joint formed at predetermined intervals.

  The fixing member 11 is formed of a bent steel plate, but may be formed of a carbon fiber plate or a reinforced resin plate. Moreover, although the said fixing member 11 had the upper end vertical part 11a, the inclination part 11b, and the lower end vertical part 11c, you may form the fixing member 11 in an L-shaped cross section.

  Moreover, although the load supporting member 14 is formed of a strip-like body formed by bundling a plurality of steel wire wires, it may be formed of a steel wire as a linear body. Moreover, it is not restricted to a steel wire, You may form a linear body with other metal wires and non-metallic wires, such as carbon fiber. Furthermore, you may bundle other metal wires and non-metallic wires, such as carbon fiber, and form a strip | belt-shaped body. Further, the load supporting member 14 may be formed of a metal plate or a synthetic resin plate. Alternatively, the load supporting member 14 may be formed of a cloth-like body formed by knitting metal fibers or non-metal fibers. Furthermore, you may form the load supporting member 14 combining any 2 or more of a linear body, a strip | belt-shaped body, a plate-shaped body, and a cloth-shaped body.

  The elastic member 13 is formed of chloroprene rubber, but may be formed of synthetic rubber such as butadiene rubber or isoprene rubber in addition to chloroprene rubber, or may be formed of natural rubber. The elastic member 13 may be made of various materials other than rubber as long as the elastic member 13 has an elastic coefficient that can be deformed with relative displacement of the floor slabs 21 and 31.

  Further, the shape of the lower surface of the elastic member 13 is not limited to the inverted gable roof shape, and may be an arc-shaped cross section or a polygonal cross section. In 1st Embodiment, the center part of the lower surface of the elastic member 13 should just be the convex shape curved below. Moreover, in 2nd Embodiment, what is necessary is just to form the thickness of the center part of the elastic member 13 larger than the thickness of both ends.

  Further, in this specification, vulcanization is not limited to sulfur, and broadly refers to crosslinking of a rubber material with, for example, a metal oxide or a basic substance.

  Moreover, the expansion-contraction apparatus 1 of said each embodiment can be installed in various road bridges, such as steel and concrete.

It is sectional drawing which shows the joint structure in which the expansion-contraction apparatus of 1st Embodiment was installed. It is sectional drawing which shows the principal part of an expansion-contraction apparatus. It is a top view which shows an expansion-contraction apparatus. It is the top view which showed the position of the load support member in an elastic member with the continuous line. It is a schematic diagram which shows the preform of a load supporting member. It is process drawing which shows the manufacturing method of the expansion-contraction apparatus of 1st Embodiment. It is sectional drawing which shows the expansion-contraction apparatus of 2nd Embodiment. It is sectional drawing which expanded and showed the slip prevention member. It is process drawing which shows the manufacturing method of the expansion-contraction apparatus of 2nd Embodiment. It is sectional drawing which shows the conventional expansion-contraction apparatus. It is sectional drawing which shows the other conventional expansion-contraction apparatus. It is sectional drawing which expanded and showed a part of other conventional expansion-contraction apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Telescopic device 2,3 Road bridge 11 Fixed member 11a Upper end vertical part of fixed member 11b Inclined part of fixed member 11c Lower end vertical part of fixed member 13 Elastic member 13a Groove of elastic member 14 Load support member 16 Anchor reinforcement 17 Anchor plate 17a Anchor plate trapezoidal portion 17b Anchor plate horizontal portion 21, 31 Floor slab d Depth of embedding of load support member in elastic member L Length of both ends of load support member along inner surface of fixing member

Claims (8)

A pair of fixing members respectively fixed to ends of a pair of floor slabs facing each other with a gap;
Both ends are fixed to the pair of fixing members, respectively, and the central portion of the lower side has a convex cross section curved downward, while the upper side is an elastic member that becomes a vehicle running surface,
The elastic member is embedded along the lower surface of the elastic member, and both end portions are along the surface of the fixing member in contact with the elastic member in a non-contact state. the Rukoto disposed deformed together with the elastic member, and characterized in that it comprises a load bearing member of the flexible formed to transfer shear load and bending load in the fixing member Telescopic device. The telescopic device according to claim 1,
The expansion and contraction device, wherein the load supporting member is formed of at least one of a linear body, a belt-like body, a plate-like body, and a cloth-like body. The telescopic device according to claim 1,
Both ends of the load support member are arranged so as to overlap the fixing member in plan view. The telescopic device according to claim 3,
The fixing member has an inclined portion extending at an inclination angle from the vicinity of the upper surface of the elastic member,
An expansion / contraction device, wherein both end portions of the load support member are arranged along a surface in contact with the elastic member of the inclined portion of the fixing member. The telescopic device according to claim 4,
A telescopic device, wherein a fixing member embedded in the floor slab is fixed to a side opposite to a side where the elastic member of the inclined portion of the fixing member is fixed. The telescopic device according to claim 1,
The elastic member is formed of natural rubber or synthetic rubber, and the load supporting member is formed of a steel wire bundled in a band shape. The telescopic device according to claim 1,
The elastic member is formed such that the upper side surface is flat and the thickness of the central part is larger than the thickness of both end parts,
Provided on the upper surface of the elastic member are a plurality of anti-slip members having an elastic base and a plurality of hard particles carried on the surface portion of the elastic base and fixed at least spaced apart from each other in the width direction. A telescopic device characterized by that. The telescopic device according to claim 7,
A telescopic device, wherein the hardness of the elastic base of the anti-slip member is greater than the hardness of the elastic member.

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