JP2009209589A - Joint structure provided with covering material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a joint structure provided with a covering material having excellent durability against repetitive load. <P>SOLUTION: A joint part 20 of a floor system 2 for mutually connecting an extended floor system 21 and a bridge floor system 22 opposing to each other across a joint 23 is provided with joint reinforcing bars 3 having at least both of end parts fixed on both of concrete members, respectively, and made of an elastic material and a polyvinyl chloride pipe 31 covering the surroundings of the joint reinforcing bar 3 on a joint 23 side more than fixing parts 32, 32 fixing the joint reinforcing bars 3. The polyvinyl chloride pipe 31 includes buried parts 31b, 31b buried into the inside of both of concrete members, respectively. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a seam structure provided with a covering material for a concrete structure provided with a seam such as a reinforced concrete floor slab.

  The bridge is provided with an expansion device near the abutment in order to absorb the expansion and contraction in the bridge axis direction due to a temperature change or the like, and vibration and noise are generated when the vehicle passes through the expansion device. For this reason, there is conventionally known a structure in which an extended floor slab is provided by extending the bridge floor slab to the land, and the noise and vibration are absorbed and reduced by the earthwork section (see Patent Documents 1 and 2, etc.).

  On the other hand, in the extended floor slab provided in this way, a deflection is generated by a live load of a passing vehicle or the like. Therefore, in order to resist the bending stress generated by the deflection with a rigid structure, the extended floor slab It is necessary to increase the amount of reinforcing bars and the thickness of the floor slab between the bridge and the slab.

On the other hand, in patent documents 1 and 2, the joint part of an extension floor slab and a bridge floor slab is made into a menase hinge structure, and is made into the flexible structure which permitted rotation, and the increase in the amount of reinforcing bars and the floor slab thickness is suppressed.
JP 2006-307473 A JP 2006-307474 A

  However, in the above-described conventional menase hinge structure, since the length of the elastic rebar that is a joint material can be freely elastically deformed without being constrained by the concrete, when the live load or temperature stress by the vehicle is repeatedly loaded, the joint portion There will be repeated plastic deformation around the periphery, and there is a concern about the decrease in durability due to fatigue.

  On the other hand, it is conceivable to increase the amount of joint material exposed at the seam and increase the free length, so that elastic deformation is possible, but if the joint spacing becomes wider, the pavement provided on it will also be divided. Since the continuity of the road is lost, there is a limit to the width of the joints.

  Then, this invention aims at providing the joint structure provided with the coating | covering material excellent in durability with respect to repeated loading.

  In order to achieve the above object, a joint structure provided with the covering material of the present invention is a joint structure of a concrete structure that connects concrete members facing each other with joints interposed therebetween, at least both ends of the concrete member. A joint material made of an elastic material that is fixed to each other, and a covering material that covers the periphery of the joint material on the joint side of the fixing portion where the joint material is fixed, and the covering material includes both the concrete materials It has the embedding part embed | buried under each inside of a member, It is characterized by the above-mentioned.

  Here, the joint material may be a reinforcing bar, and the covering material may be formed of a resin pipe or a cloth material. The joint material may be disposed obliquely with respect to the joint.

  Furthermore, the concrete member may be plate-shaped. Moreover, the integral upper layer part straddling both the said concrete members can be formed above the said concrete member and the said joint. The concrete structure may be a bridge slab.

  In the joint structure provided with the covering material of the present invention configured as described above, the joint material in which both ends are fixed to the concrete member opposed across the joint, the periphery of the joint side is covered with the covering material, The covering material has an embedded portion embedded in both concrete members.

  For this reason, the joint material made of an elastic material can secure a free length that is not restrained by concrete by the covering material to be longer than the interval between joints, and is repeatedly loaded so that rotation and displacement occur around the joints. However, it can endure by the elastic deformation of the joint material.

  In other words, if a joint material is formed by reinforcing bars that are elastic materials, and the surroundings are covered with a resin pipe or cloth material that does not restrain deformation of the joint material, the reinforcing bars in the portion covered with the coating material can be freely used. Elastic deformation can be repeated. Moreover, since the both ends of the joint material are respectively fixed to both concrete members, the two members can be connected.

  Furthermore, such a configuration of the present invention can be applied to a menase-type hinge structure in which a joint material such as a reinforcing bar is disposed obliquely with respect to the joint.

  Further, if the concrete member is a plate-like member that is easily affected by temperature stress and has a high necessity for providing joints, such a joint structure can be provided to make a structure excellent in durability against repeated loading. .

  In addition, since the covering material is embedded in the concrete member, the necessary free length can be secured without widening the joint interval, and the upper part of the concrete member and joint are covered with an integral upper layer part, and the road is continuous. Etc. can be constructed.

  In addition, if such a seam structure provided with a covering material is applied to a seam structure between a bridge floor slab and an extended floor slab provided on an earthwork section on the land side, a seam structure capable of rotational deformation and displacement deformation can be obtained. As a result, it is possible to construct a bridge having excellent durability that can be used for a long period of time even when a live load such as a vehicle is repeatedly loaded.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  First, the structure of the bridge 1 in which the joint structure of the floor slab 2 as a concrete structure of this embodiment is constructed will be described with reference to FIG.

  FIG. 2 shows a configuration in the vicinity of the abutment 15 on one side where the bridge 1 is bridged, and the end of the girder part 14 of the bridge 1 is placed on the upper surface of the abutment 15 via the support part 142. The For this support part 142, for example, a metal support material can be used. A bridge deck 22 as a concrete member such as reinforced concrete is provided on the girder portion 14.

  Further, at the end portion of the girder portion 14, a horizontal girder 141 is extended in a direction orthogonal to the girder portion 14, and the end portion of the bridge floor slab 22 is placed on the upper surface thereof. An extended floor slab 21 is provided as a concrete member facing the end of the bridge floor slab 22. A portion where the extended floor slab 21 and the bridge floor slab 22 are abutted becomes a seam portion 20 as a joint structure of the floor slab 2.

  The extended floor slab 21 is placed on a ground slab 16 provided on an earthwork section 19 that is a foundation ground on the land side of the bridge 1. The bottom plate 16 is a plate-like structure having an L shape in cross-section, and one end edge is placed on a protrusion 15a provided on the back side of the abutment 15, and the protrusion provided on the other end edge. The end of the road portion 18 is supported on the strip.

  The extended floor slab 21 is placed on the bottom slab 16 between the road portion 18 and the bridge floor slab 22 via, for example, a rubber bearing (not shown). An expansion joint 17 is provided between the extended floor slab 21 and the end portion of the road portion 18. When the floor slab 2 including the extension floor slab 21 and the bridge floor slab 22 expands and contracts due to a temperature change, the expansion joint 17 The displacement is absorbed, so that excessive temperature stress does not act on the floor slab 2. The floor slab 2 is covered with a pavement 11 as an upper layer.

  Next, details of the joint portion 20 of the floor slab 2 on which the joint rebar 3 as a joint material is arranged with the extended floor slab 21 and the bridge floor slab 22 facing each other will be described with reference to FIG.

  The joint portion 20 of the floor slab 2 is provided at a portion where the extended floor slab 21 and the bridge floor slab 22 that face each other across the joint 23 are connected.

  The joint 23 is, for example, at intervals of about 5 to 10 mm, and the joint 23 cuts off the transmission of stress between the concrete members of the extended floor slab 21 and the bridge floor slab 22.

  Further, one end of the extended floor slab 21 is placed on the upper surface of the girder 14 via the rubber support 12. Furthermore, in order to make this joint part 20 correspond to rotational deformation, as shown in FIG. 1, a protective material 13 such as a rubber material is disposed above the joint 23.

  And the joint rebar 3 is arrange | positioned as a joint material ranging over this extension floor slab 21 and the bridge floor slab 22. As shown in FIG. The joint reinforcing bar 3 is disposed, for example, in the vicinity of the neutral shaft that becomes the center of rotation when the joint portion 20 is rotationally deformed.

  The joint reinforcing bar 3 is formed of an elastic material such as a bar-shaped reinforcing bar or a PC steel bar, and at least both ends are fixed to the extended floor slab 21 and the bridge floor slab 22.

  That is, the predetermined length from both ends of the joint rebar 3 is the fixing portions 32, 32 as shown in FIG. 1, and when the concrete placed around it is hardened, it is integrated with the concrete member by its adhesive force. This is where The lengths of the fixing portions 32 are set to a length that prevents the joint rebar 3 from being pulled out by a bending moment, a tensile force, a shearing force, or the like that acts on the joint portion 20.

  Further, the joint rebar 3 between the fixing portions 32 and 32 is covered with a vinyl pipe 31 as a covering material and is separated from the adhesion of concrete. The vinyl pipe 31 is a resin pipe made of synthetic resin, and is formed of a flexible material that does not restrain deformation of the joint rebar 3 accommodated therein.

  The vinyl pipe 31 has embedded portions 31 b and 31 b embedded in the extended floor slab 21 and the bridge floor slab 22, and an exposed portion 31 a exposed in the gap between the joints 23.

  Further, both ends of the vinyl pipe 31 are fastened with fastening tapes 311 and 311 so that the concrete does not enter the inside through the gap between the joint reinforcing bar 3 and the vinyl pipe 31. Here, the gap between the joint rebar 3 and the vinyl pipe 31 can be filled with grease or the like. Moreover, it is good for the part of the joint reinforcement 3 covered with the vinyl pipe 31 to carry out a rust prevention process by coating etc.

  A pavement portion 11 is formed above the extended floor slab 21, joint 23 and bridge floor slab 22 as an integral upper layer straddling the extended floor slab 21 and bridge floor slab 22. The pavement portion 11 includes a base layer portion 11b in contact with the upper surfaces of the extended floor slab 21 and the bridge floor slab 22, and a surface layer portion 11a laminated thereon. And between the surface layer part 11a and the base layer part 11b above the joint 23, a reinforcing sheet 11c formed of reinforced glass fiber or the like is arranged to reinforce the periphery of the joint 23.

  Moreover, the joint reinforcement 3 is arrange | positioned at intervals in the width direction of the floor slab 2, as shown in the top view seen in the AA arrow direction of FIG. In FIGS. 1 and 3 and the like, illustration of the reinforcing bars when the floor slab 2 is constructed of reinforced concrete is omitted.

  Next, the effect | action of the joint part 20 provided with the vinyl pipe 31 of this Embodiment is demonstrated.

  In the joint portion 20 of the floor slab 2 of the present embodiment configured as described above, the joint rebar 3 whose both ends are fixed to the extension floor slab 21 and the bridge floor slab 22 that are opposed to each other with the joint 23 interposed therebetween is fixed. The area around the joint 23 from the portions 32 and 32 is covered with a vinyl pipe 31. Further, the vinyl pipe 31 has embedded portions 31b and 31b embedded in the extended floor slab 21 and the bridge floor slab 22, respectively.

  Then, when the vehicle 4 travels as shown in FIG. 2 in the bridge 1 having the joint portion 20 of the floor slab 2 configured as described above, the girder portion 14 of the bridge 1 is bent and the extended floor slab 21 and the bridge floor are connected. A rotational deformation of a rotational angle θ occurs between the plate 22 and the plate 22.

  FIG. 4 shows an enlarged view of the periphery of the seam 20 at this time. In FIG. 4, the paving portion 11 and the like are not shown for easy understanding.

  As shown in FIG. 4, when the girder portion 14 is bent and tilted, the bridge floor slab 22 and the extended floor slab 21 that were in the positions illustrated by the two-dot chain line are also tilted accordingly, and the joint portion 20 is rotationally deformed. To do. At this time, since the fixing portions 32 and 32 of the joint reinforcing bar 3 are attached and restrained by the concrete to the extension floor slab 21 and the bridge floor slab 22, the relative positions with respect to the extension floor slab 21 and the bridge floor slab 22 are set. It does not change and is similarly deformed as an integral structure. The length of the fixing unit 32 is the fixing length DL.

  On the other hand, the joint rebar 3 in the portion covered with the vinyl pipe 31 is not attached to the concrete, and can be elastically deformed or stretched freely without being constrained by the concrete. The length covered with the vinyl pipe 31 is the free length FL.

  When rotational deformation occurs in the joint portion 20, the length of the fixing length DL does not change, but the joint rebar 3 having the free length FL is allowed to be elastically deformed. That is, the joint rebar 3 made of an elastic material can freely expand and contract within the elastic range in the free length FL in which the deformation is not constrained by the concrete by the vinyl pipe 31.

  For this reason, even if the loading and shear deformation that cause rotation at the joint portion 20 are repeated, the joint rebar 3 can withstand the elastic deformation.

  Furthermore, if the joint rebar 3 which is an elastic material is covered with the vinyl pipe 31, even if the joint rebar 3 of the free length FL part covered with the vinyl pipe 31 is elastically deformed, the vinyl pipe 31 follows it. Since the joint rebar 3 can be deformed, the joint rebar 3 can freely repeat elastic deformation without being restrained by the vinyl pipe 31.

  Moreover, since both ends of the joint reinforcing bar 3 are fixed to the extended floor slab 21 and the bridge floor slab 22 respectively, the two floor slabs 21 and 22 can be reliably connected by the joint reinforcing bar 3.

  Further, if the plate-like member is highly required to provide joints 23 that are bent or affected by temperature stress, such as the floor slab 2 of the bridge 1 having a long extension, By providing the joint portion 20 that is less likely to cause plastic deformation and excessive stress, a structure having excellent durability against repeated loading can be obtained.

  Furthermore, if the vinyl pipe 31 is embedded in the extended floor slab 21 and the bridge floor slab 22, the required free length FL can be easily secured without increasing the distance between the joints 23. A continuous road can be constructed by covering the upper part of the bridge floor slab 22 and the joint 23 with the integrated pavement 11.

  For example, in order to rotationally deform the joint portion 20 within the range of elastic stress, even if it is calculated that the length of the free length FL that is not subjected to concrete restraint is about 10 to 12 cm, the gap between the support portions of the pavement portion 11 The allowable width is a limit of 1 cm. On the other hand, by covering the joint rebar 3 with the vinyl pipe 31 and providing the embedded portions 31b and 31b to the extended floor slab 21 and the bridge floor slab 22, the joint rebar is provided even if the distance between the joints 23 is 1 cm. 3 can have a free length FL of about 10 to 12 cm.

  Further, if the length of the free length FL of the joint reinforcing bar 3 can be arbitrarily adjusted regardless of the distance between the joints 23 as described above, a vertical or horizontal shift may occur between the extended floor slab 21 and the bridge floor slab 22. The seam 20 can be formed so as to be accommodated within the range of elastic deformation against shear deformation.

  And the bridge 1 in which such a seam portion 20 is provided between the extension floor slab 21 and the bridge floor slab 22 is an extension floor provided in the earthwork section 19 even if a live load such as the vehicle 4 is repeatedly loaded. Generation of vibration and noise is suppressed by the plate 21. In addition, since the deformation of the joint portion 20 caused by repeated loading is within the range of elastic deformation of the joint rebar 3, the bridge 1 having excellent durability that can be used for a long time can be obtained.

  Hereinafter, an example of a mode different from the above-described embodiment will be described with reference to FIG. The description of the same or equivalent parts as those described in the above embodiment will be given the same reference numerals.

  The joint structure of the floor slab 2A as a concrete structure of the bridge 1A described in this embodiment is a menase type hinge structure in which the joint material is disposed obliquely with respect to the joint 23A. Three types of joint materials are arranged between the extended floor slab 21A and the bridge floor slab 22 as concrete members facing each other across the joint 23A.

  First, the menase joint 5A disposed at the forefront of FIG. 5 as a joint material is fixed to the upper portion of the bridge floor slab 22A in a hemispherical shape and fixed to the extension floor slab 21A in a reverse hemispherical shape. And a vinyl pipe 51A as a covering material covering the outer periphery of the menase joint 5A between the fixing portions 52A and 52A. That is, the menase joint 5A has an oblique portion 521 that obliquely intersects the joint 23A, and the portion exposed to the joint 23A and the oblique portions 521 on both sides thereof are covered with the vinyl pipe 51A to become a free length. .

  In addition, a menase joint 5B as a joint material is disposed in the horizontal direction at the back of the menase joint 5A in the width direction of the floor slab 2A. This menase joint 5B has fixing portions 52B and 52B on both sides of a linear reinforcing bar, and a vinyl pipe 51B as a covering material is mounted between the fixing portions 52B and 52B.

  Further, a menase joint 5C as a joint material is arranged in the back of the menase joint 5B so as to be line-symmetric with the menase joint 5A. Similarly to the menase joint 5A, the menase joint 5C also includes a hemi-shaped fixing portion 52C, 52C, and a vinyl pipe 51C as a covering material mounted therebetween.

  A plurality of these menase joints 5A-5C are arranged as a set, and a plurality of sets are arranged at intervals in the width direction of the floor slab 2A.

  Thus, even in a menase-type hinge structure in which a joint material such as a reinforcing bar is obliquely arranged with respect to the joint 23A, the length of the free length can be arbitrarily adjusted by the vinyl pipes 51A-51C. However, the seam 20A can be deformed within the elastic range.

  Other configurations and operational effects are substantially the same as those in the above-described embodiment, and thus description thereof is omitted.

  The best embodiment of the present invention has been described in detail with reference to the drawings, but the specific configuration is not limited to this embodiment and example, and the design does not depart from the gist of the present invention. Such modifications are included in the present invention.

  For example, although the vinyl pipes 31, 51A-51C have been described as the covering material in the embodiment or the example, the present invention is not limited to this, and concrete such as a thick cloth material with fine texture is used. Any material can be used as a coating material as long as it can block adhesion of the joint material to the joint material and does not prevent free deformation of the joint material. For example, as a material for the covering material, a polymer compound such as resin or rubber, or a fiber such as woven fabric or nonwoven fabric can be used. In addition, as the form of the covering material, a pipe form, a wrapping form, a coating form, or the like can be applied.

  Moreover, in the said embodiment or the said Example, although the floor slab 2 and 2A of the bridge 1 and 1A was demonstrated as a concrete structure, it is not limited to this, Deformation, such as rotation deformation, shear deformation, or expansion / contraction The present invention can be applied to any concrete structure having a seam structure in which the above occurs.

It is sectional drawing explaining the structure of the seam part of the floor slab of the best embodiment of this invention. It is explanatory drawing for demonstrating the structure of the bridge which provides the floor slab of the best embodiment of this invention. It is the top view seen in the AA arrow direction of FIG. It is explanatory drawing which expands and demonstrates the detail of a joint part. It is sectional drawing explaining the structure of the joint part of the floor slab of an Example.

Explanation of symbols

1,1A Bridge 11 Pavement (upper part)
2,2A Floor slab (concrete structure)
20, 20A seam part (seam structure)
21, 21A Extended floor slab (concrete member)
22,22A Bridge deck (concrete member)
23, 23A Joint 3 Joint rebar (joint material)
31 Vinyl pipe (coating material)
31a Exposed portion 31b Buried portion 32 Fixing portion 5A-5C Menase joint (joint material)
51A-51C Vinyl pipe (coating material)
52A-52C fixing section

Claims (6)

It is a joint structure of a concrete structure that connects concrete members facing each other across the joint,
A joint material made of an elastic material having at least both ends fixed to both the concrete members, and
A covering material covering the periphery of the joint material on the joint side with respect to the fixing portion where the joint material is fixed;
A seam structure provided with a covering material, wherein the covering material has embedded portions embedded in both of the concrete members.   The joint structure according to claim 1, wherein the joint material is a reinforcing bar, and the covering material is formed of a resin pipe or a cloth material.   The joint structure according to claim 1 or 2, wherein the joint material is disposed obliquely with respect to the joint.   The said concrete member is plate shape, The joint structure provided with the coating | covering material as described in any one of Claim 1 thru | or 3 characterized by the above-mentioned.   The joint structure provided with the covering material according to any one of claims 1 to 4, wherein an integral upper layer portion straddling both the concrete members is formed above the concrete member and the joint. . The said concrete structure is a floor slab of a bridge, The joint structure provided with the coating | covering material as described in any one of Claim 1 thru | or 5 characterized by the above-mentioned.

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