JP5124700B1 - Bridge girder support structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bridge girder support structure that can appropriately cope with a case where a bridge girder is inclined and supported by bridges or a bridge girder deformed such as warp is supported by bridges.
SOLUTION: A bridge girder support structure for supporting a bridge girder 1 via a pillow material 3 on a bridge seat surface 2a of an abutment or a pier 2, and the girder support surface 3a of the pillow material 3 in the bridge length direction of the bridge girder 1 is provided. It is characterized by having a curved surface structure or a polygonal surface structure that supports the bridge girder 1 according to the inclination.
[Selection] Figure 1

Description

  The present invention relates to a structure for supporting a bridge girder via a pillow material on a bridge seat surface of an abutment or a pier.

  Conventionally, when supporting a bridge girder via a pillow material on the abutment or the pier of the pier, using a rubber bearing that absorbs vehicle running vibration as a pillow material, a method of softly coupling the bridge girder end to the abutment or pier, As exemplified in the following Patent Documents 1 to 4, a concrete pillow is disposed on the bridge seat surface of the abutment or the pier, and both ends of the bridge girder are supported through the pillow, and the support is provided with concrete. Is used to rigidly connect the end of the bridge girder to the abutment or pier.

Japanese Patent No. 4245657 Japanese Patent No. 4318694 Japanese Patent No. 4359597 Japanese Patent No. 4607204

  Each of the pillow materials has a structure for receiving the lower surface of the bridge girder with a support surface composed of a plane parallel to the bridge seat surface, and since the support surface of the pillow material is a single plane, the bridge girder is in the bridge length direction. Inability to properly adapt to the site where the bridge must be inclined and supported, and when the pillow is made of concrete, the bridge girder is received at the left and right corners of the support surface, and the corners are missing. have.

  The present invention effectively solves the problems of the conventional bridge girder support structure, and provides a bridge girder support structure that can appropriately cope with the case where the bridge girder is inclined to support the bridge or the bridge girder deformed such as warp is supported. To do.

  In short, the present invention is a bridge girder support structure that supports a bridge girder via a pillow material on a bridge seat surface of an abutment or a pier, and the girder support surface of the pillow material depends on the inclination of the bridge girder in the bridge length direction. The bridge girder can be appropriately supported by using a curved surface structure or a polygonal surface structure that supports the bridge girder.

  Preferably, the pillow material and the bridge girder supported by the pillow material are embedded in concrete cast on the bridge seat surface, and the bridge girder and the abutment or pier are rigidly connected.

  In addition, a reinforcing layer is provided on the support surface of the above-mentioned pillow material, and the bridge support of the bridge girder is reliably achieved by the support surface of the same.

  Further, it has means for adjusting the height of the pillow material, and it is possible to effectively respond to the inclination of the bridge girder by adjusting the height by the means.

  According to the present invention, the bridge girder can be appropriately adapted and reliably supported in any case where the bridge girder is inclined to support the bridge or the bridge girder deformed due to warpage or the like is supported.

Sectional drawing in the bridge length direction of the bridge girder support structure which concerns on this invention. Sectional drawing in the bridge width direction of the bridge girder support structure which concerns on this invention. The bridge length direction sectional view which shows the example which made the girder support surface of the pillow material the polygonal surface structure. It is bridge length direction sectional drawing which shows the example which provided the reinforcement layer in the girder support surface of the pillow material, A shows the example which provided the reinforcement layer only in the girder support surface, B is a reinforcement layer in the girder support surface and the right-and-left side surface An example in which is provided. The bridge cross-sectional view which shows the example which provided the pillow material discontinuously in the bridge width direction in the bridge girder support structure which concerns on this invention. The bridge length direction expanded sectional view which shows the example which provided the height adjustment means of the pillow material. The bridge length direction expanded sectional view which shows the example which formed the bottom face of the pillow material in a pair of taper surface.

  The best mode for carrying out the present invention will be described below with reference to FIGS. The terms of the following piers are a generic term for abutments and piers.

  In the bridge girder support structure according to the present invention, first, as shown in FIGS. 1 and 2, a plurality of bridge girders 1 are made of concrete, metal or synthetic resin pillows on a bridge seat surface 2a of a concrete pier 2. It is arranged in parallel in the bridge width direction while being supported via the material 3.

  The bridge girder 1 is a steel girder or a concrete girder. As a preferred example, as shown in FIGS. 1 and 2, an H-shaped steel having an upper flange 1b at the upper end of the abdomen plate 1a and a lower flange 1c at the lower end. A bridge girder 1 is used.

  As shown in FIG. 2, the pillow 3 is continuously arranged in the bridge width direction, and as shown in FIG. 1, the girder support surface (upper surface) 3a has a curved surface structure, or as shown in FIG. The bridge girder 1 is supported according to the inclination of the bridge girder 1 in the bridge length direction by using the girder support surface 3a as a polygonal structure.

  That is, even when the bridge girder 1 is supported by being inclined and bridged or when the bridge girder 1 is deformed due to warpage or the like, it comprises a curved structure of the girder support surface 3a of the pillow 1 or a plurality of minute width surfaces 3c. The lower end surface of the bridge girder 1 can be supported following the polygonal surface structure to appropriately adapt to the inclination of the bridge girder 1.

  Therefore, when the girder support surface 3a has a curved surface structure, the girder support surface 3a supports the bridge girder 1 in line contact with the bridge girder portion 1 'supported on the same surface 3a along the bridge width direction. When the girder support surface 3a has a polygonal structure, the girder support surface 3a is in surface contact with the bridge girder portion 1 'along the bridge width direction, that is, any one of the minute width surfaces 3c is contacted to support the bridge girder 1. To do.

  The pillow 3 is provided with a reinforcing layer 4 on the girder support surface 3a as shown in FIG. 4A, or provided with a reinforcing layer 4 on the girder support surface 3a and the left and right side surfaces 3b as shown in FIG. 4B. The structure or the polygonal structure can be reinforced. The reinforcing layer 4 is preferably formed by covering the girder support surface 3a with a fiber sheet made of carbon fiber, aramid fiber, glass fiber, FRP or a mixed fiber thereof. Alternatively, when the pillow 3 is made of concrete, reinforcing fibers such as vinylon fibers, polyethylene fibers, carbon fibers, and aramid fibers and reinforcing wires such as reinforcing bars are embedded in the concrete to form the pillow 3 firmly. .

  The girder support surface 3a is formed by laying the pillow material 3 in the laying groove 2b wider and lower than the pillow material 3 formed on the bridge seat surface 2a, and placing mortar or concrete 14 in the laying groove 2b. Is fixed and arranged so as to protrude upward from the bridge seat surface 2a. Alternatively, when the pillow 3 is made of concrete, the pillow 3 is formed integrally with the pier 2 and protrudes from the bridge seat surface 2a.

  In the case where the pillow 3 is arranged using the laying groove 2b, as shown in FIG. 6, it can be configured to have a height adjusting means 5 comprising a cylindrical nut 5a and a bolt 5b. The height adjusting means 5 can adjust the height (level) of the girder support surface 3a of the pillow material 3 to more appropriately respond to the inclination of the bridge girder portion 1 '. In addition, the inclination of the bridge girder 1 'can be absorbed by the height adjustment. The height adjusting means 5 is not limited to the one composed of the cylindrical nut 5a and the nut 5b, but may be any means that can adjust the height of the pillow material 3 (girder support surface 3a).

  FIG. 7 shows another example of the pillow material 3, and shows an example in which the bottom surface 3 d of the pillow material 3 is formed to have a pair of tapered surfaces that are inclined symmetrically upward from the center line in the bridge width direction. Yes. By means of the bottom surface 3d composed of the pair of tapered surfaces, the air (bubbles) in the mortar or concrete 14 placed in the laying groove 2b is easily discharged along the tapered surfaces, and the pillow material 3 is evenly distributed. Can be fixed.

  After each bridge girder 1 is supported on the bridge seat surface 2a of the pier 2 via the pillow material 3 as described above, as shown in FIGS. Concrete is cast in a space defined by the flanges 1b and 1c and the abdomen plate 1a to form the slab concrete 6, and a floor slab 7 composed of a composite structure of the bridge girder 1 and the slab concrete 6 is formed. Further, a plurality of abdominal threading bars 13 through which the abdominal plates 1 a of all the bridge girders 1 are inserted in the bridge width direction are provided, and the abdominal threading bars 13 are embedded in the slab concrete 6.

There is an upper opening 8 extending in the bridge length direction between the adjacent upper flanges 1b, and concrete is placed in the space through the upper opening 8 to form the slab concrete 6, and at the same time, the adjacent lower flange 1c. A part of the concrete flows out toward the bridge seat surface 2a through the lower opening 8 'extending in the bridge length direction between the two, and a connected concrete 9 is formed by the part of the concrete to be concrete-bonded to the bridge seat surface 2a and the pillow material 3. To do.

  If it restates, the connecting concrete 9 which embeds the bridge material 3 and the bridge girder part 1 'supported by the pillow material 3 on the bridge seat surface 2a of the pier 2 will be increased, and as shown in FIGS. The slab concrete 6 and the concrete bridge pier 2 are concretely connected through the connecting concrete 9, and the bridge girder 1 is connected to the pier 2 through the slab concrete 6 and the connecting concrete 9.

  That is, after the concrete pier 2 in which the pillow material 3 is integrally formed is constructed, or after the concrete pier 2 is constructed and the pillow material 3 is disposed on the bridge seat surface 2a, the bridge girder 1 is formed on the girder support surface 3a of the pillow material 3. In the case of the H-shaped steel bridge girder 1, the lower flange 1c is supported on the girder support surface 3a of the pillow 3 and the connecting concrete 9 is placed on the bridge seat surface 2a.

  As shown in FIGS. 1 and 2, the connecting concrete 9 makes the concrete pier 2 substantially bulky, and in the case of the bridge girder portion 1 ', or the H-shaped steel bridge girder 1, the upper surface of the upper flange 1b is formed. The top 9 a of the upper connecting concrete 9 is covered, that is, the upper end portion (upper flange 1 b) of the bridge girder 1 is embedded in the upper part 9 a of the connecting concrete 9, and is concretely connected to the slab concrete 6 through the upper opening 8 of the bridge girder 1.

  Further, when the bridge girder 3 is interposed, the lower surface of the bridge girder portion 1 ′, or in the case of the H-shaped steel bridge girder 1, is connected through the lower opening 8 ′ in the space formed between the lower surface of the lower flange 1c and the bridge seat surface 2a. The concrete 9 is filled and concrete-bonded with the bridge seat surface 2a, and the bottom surface 9c of the connecting concrete 9 filled in the space covers the lower surface of the bridge girder portion 1 '(the lower flange 1c lower surface). That is, the lower end portion (lower flange 1 c) of the bridge girder 1 is embedded in the bottom portion 9 c of the connecting concrete 9, and at the same time, the pillow material 3 is embedded in the bottom portion 9 c of the connecting concrete 9.

  When the bridge girder part 1 ′ is inclined in the bridge length direction, the bridge girder part 1 ′ is supported according to the inclination by the curved surface structure or the polygonal surface structure of the girder support surface of the pillow 3 as described above. Then, the connecting concrete 9 is placed. A rear end surface 9d of the connecting concrete 9 is formed in parallel with the end surface 1d of the inclined bridge girder portion 1 ′ (bridge girder 1) to form a rear side portion 9b having a uniform width to reinforce the rigid coupling structure. That is, thickness unevenness of the connecting concrete 9 (9b) covering the end face 1d of the bridge girder 1 is eliminated and a strong rigid connection is achieved.

  As a means for strengthening the concrete connection structure by the connecting concrete 9, that is, the rigid connection structure, a bridge girder part supported by the bridge seat surface 2 a of the concrete pier 2 via the pillow 3 and embedded in the connecting concrete 9. 1 'and the concrete pier 2 are connected by a connecting rod 10 made of a connecting wire or a connecting pipe material embedded in the connecting pier 2 and the connecting concrete 9. The connecting rod 10 cooperates with the connecting concrete 9 to form the rigid connection structure.

  The connecting rod 10 extends in the vertical direction over substantially the entire height in the pier 2 and protrudes upward from the bridge seat surface 2a, and the protruding portion corresponds to the bridge girder portion 1 'and / or slab concrete 6. Connect to the pier 2 through the part.

  For example, when the bridge girder 1 is an H-shaped steel bridge girder 1, the protruding portion of the connecting rod 10 is inserted into a through hole provided in the lower flange 1c and the upper flange 1b, and the connection protruding from the upper surface of the upper flange 1b. A nut 11 is screwed into the male thread portion of the rod 10, and the nut 11 is seated on the upper surface of the upper flange 1 b to connect the bridge girder portion 1 ′ to the pier 2.

  Similarly, when using a T-shaped steel bridge girder made of steel as the bridge girder 1 and having an upper flange 1b, an I-shaped steel girder, and various concrete bridge girders, the upper flange 1b of the steel bridge girder and various concrete bridge girders are used. The upper end protruding portion of the connecting rod 10 is inserted into the main body of the spar, and is fixed to the upper flange 1b or the main body of the spar with a stopper such as a nut 11.

  As shown in FIGS. 1 and 2, when the bridge girder 1 is an upper surface of the bridge girder 1 or an H-shaped steel bridge girder 1, an elongated seat plate 12 extending in the bridge width direction is installed on the upper surface of the upper flange 1b. The upper end protruding portion of the connecting rod 10 is inserted into a through-hole formed in 12, and a nut 11 is screwed onto the upper end protruding portion (male thread portion) on the upper surface of the elongated seat plate 12 to be seated on the elongated seat plate 12. .

  In addition, a part of the connecting rod 10 penetrates a portion corresponding to the slab concrete 6 of the connecting concrete 9 and protrudes upward through the upper opening 8. The nut 11 is screwed into the protruding portion (male thread portion) on the upper surface of the seat plate 12 and is seated on the elongated seat plate 12.

  As shown in FIG. 1, the nut 11 is screwed through a washer 15 having a tapered shape and seated on the elongated seat plate 12. That is, the nut 11 is elongated through a tapered washer 15 having a taper shape corresponding to the inclination of the bridge girder 1, specifically, the upper surface of the bridge girder 1, or in the case of the H-shaped steel bridge girder 1. It sits on the seat plate 12 and more accurately connects the bridge girder 1 and the pier 2.

  As described above, according to the bridge girder support structure according to the present invention, the inclined bridge girder 1 (bridge girder portion 1 ') can be appropriately and stably supported. In the present invention, the case where the slab concrete 6 and the connecting concrete 9 described above are not placed is not excluded.

  Further, in the present invention, as shown in FIG. 5, the pillow material 3 is made short and discontinuously arranged in the bridge length direction, that is, the short pillow material 3 is arranged according to the parallel interval of the bridge girder 1. Supporting the bridge girder 1 is optional depending on the implementation.

  Further, the support structure according to the present invention is not limited to the case where the end portion of the bridge girder 1 described above is supported, and the bridge girder 1 can be appropriately supported even when the middle portion of the bridge girder 1 is supported.

DESCRIPTION OF SYMBOLS 1 ... Bridge girder, 1a ... Abdomen, 1b ... Upper flange, 1c ... Lower flange, 1d ... End face, 1 '... Bridge girder part, 2 ... Bridge pier, 2a ... Bridge seat surface, 2b ... Laying groove, 3 ... Pillow material, 3a ... Girder support surface, 3b ... Left and right side surfaces, 3c ... Fine width surface, 3d ... Bottom surface, 4 ... Reinforcement layer, 5 ... Height adjusting means, 5a ... Cylindrical nut, 5b ... Bolt, 6 ... Slab concrete, 7 ... Floor slab 8 ... Upper opening, 8 '... Lower opening, 9 ... Connection concrete, 9a ... Upper part of connection concrete, 9b ... Rear side part, 9c ... Bottom part, 9d ... Rear end surface, 10 ... Connection rod, 11 ... Nut , 12 ... elongated seat plate, 13 ... belly bar, 14 ... mortar or concrete to be placed in the laying groove, 15 ... taper washer.

Claims (4)

  A bridge girder support structure that supports a bridge girder via a pillow material on a bridge seat of an abutment or a pier, and a curved surface structure that supports the bridge girder according to the inclination of the bridge girder in the bridge length direction. Or a bridge girder support structure characterized by having a polygonal structure.   2. The bridge girder support structure according to claim 1, wherein the pillow material and a bridge girder portion supported by the pillow material are embedded in concrete cast on the bridge seat surface.   The bridge girder support structure according to claim 1 or 2, wherein a reinforcing layer is provided on the girder support surface of the pillow material.   The bridge girder support structure according to any one of claims 1 to 3, further comprising means for adjusting a height of the pillow material.

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