JP2016160656A - Sliding surface structure between bottom slab and extended floor slab, and construction method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sliding surface structure between a bottom slab and an extended floor slab that offers high workability and improved durability.SOLUTION: A sliding surface structure of an extended floor slab includes a bottom slab 1 formed above a bridge abutment 61 and an earthwork section 62, an extended floor slab 2 connected to an existing floor slab 64 of a bridge 63 and extending toward an earthwork section 62 side from an edge part of the bridge 63, a slidable rubber plate 3 disposed between the bottom slab 1 and the extended floor slab 2 as a sliding surface of the extended floor slab 2, and a fall-off prevention member 4 for preventing fall-off of the rubber plate 3 from the extended floor slab 2. Hard rubber of a hardness between about 60 and 90 is used, for example, with the rubber plate 3. A light-weight and highly workable resin member, for example a foam polyethylene plate, is used with the fall-off prevention member 4.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a sliding surface structure of a bottom slab installed on an abutment and an earthwork section, and an extended floor slab extending from the end of the bridge toward the earthwork section and sliding on the bottom slab.

  Conventionally, a bottom slab is installed on the abutment and the earthwork section, and an extension floor slab that extends from the end of the abutment to the earthwork section and slides on the bottom slab is installed so that the bridge can be expanded and contracted to the earthwork section. By moving the installation position of the telescopic device such as finger joints connected to the bridge from the gap between the bridge and the abutment to the earthwork section, measures are taken to reduce noise, vibration, etc. generated from this gap during vehicle travel. ing.

  Patent Document 1 discloses a joint structure in the vicinity of an abutment that can reduce the construction cost and improve the durability of the bridge. In this joint structure, the bottom plate is constructed on the abutment and the earthwork part by cast-in-place concrete. In addition, the steel plate constituting the sliding surface of the extended floor slab is installed on the bottom plate, and the extended floor slab is constructed on the steel plate by on-site concrete.

JP 2009-275412 A

  In the joint structure described in Patent Document 1, the sliding surface of the extended floor slab is made of a steel plate. For this reason, the sliding surface of the extended floor slab may be corroded by the intrusion of rainwater from the pavement surface. Further, the extended floor slab moves up and down due to vibrations of the bridge caused by traveling of the vehicle and the like, and the extended floor slab collides with the end of the bottom slab, and the bottom slab may be chipped. Furthermore, the steel plate is heavy and requires a large machine or the like for installation, and the workability is poor.

  This invention is made | formed in view of the said situation, The objective is to provide the sliding surface structure of a bottom slab and an extended floor slab which is excellent in workability and can improve durability.

  In order to solve the above-mentioned problems, in the present invention, a sliding surface is formed by using rubber having slidability on at least one of the bottom slab and the extended floor slab.

For example, the present invention is a sliding surface structure of a bottom plate installed on an abutment and an earthwork part, and an extended floor slab that extends from the end of the bridge to the earthwork part side and slides on the bottom plate,
At least one of the bottom slab and the extended floor slab includes a slidable rubber plate disposed between the bottom slab and the extended floor slab as a sliding surface sliding with the other.

  Here, as the rubber plate having slidability, for example, a rubber plate made of hard rubber is used.

  In the present invention, since the sliding surface of the bottom slab and the extended floor slab is configured by using a rubber plate having sliding properties, the sliding surface is not corroded by the intrusion of rainwater from the pavement surface. The rubber plate is lighter than the steel plate. For this reason, it is possible to increase the plate thickness and increase the gap between the extended floor slab and the bottom slab, so that when the extended floor slab moves up and down due to the vibration of the bridge, the extended floor slab moves to the end of the bottom slab. The possibility of collision with the bottom plate can be reduced, and corner cracks in the bottom plate can be prevented. Furthermore, the rubber plate is easier to construct than the steel plate.

  Therefore, according to the present invention, it is possible to provide a sliding surface structure of a bottom plate and an extended floor slab that is excellent in workability and can improve durability.

FIG. 1 is a schematic sectional view of a sliding surface structure between a bottom slab and an extended floor slab according to an embodiment of the present invention. FIG. 2 is an enlarged view of part A of the sliding surface structure shown in FIG. FIG. 3 is an enlarged view of part A of a modified example of the sliding surface structure shown in FIG. FIG. 4 is an enlarged view of part A of a modification of the sliding surface structure shown in FIG.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic sectional view of a sliding surface structure between a bottom slab and an extended floor slab according to the present embodiment.

  As shown in the figure, the sliding surface structure of the bottom slab and the extended floor slab according to the present embodiment is connected to the bottom slab 1 formed on the abutment 61 and the earthwork section 62, and the existing floor slab 64 of the bridge 63, An extended floor slab 2 extending from the end of the bridge 63 to the earthwork section 62 side, and a rubber plate 3 having slidability disposed between the bottom slab 1 and the extended floor slab 2 as a sliding surface of the extended floor slab 2; And a slip-off preventing member 4 for preventing the rubber plate 3 from falling off the extended floor slab 2.

  The rubber plate 3 is made of a material having a good sliding property having a friction coefficient of 1.2 or less, for example, a hard rubber having a hardness of about 60 to 90. Hard rubber has a coefficient of friction (about 0.64) smaller than the coefficient of friction (about 0.75) of the galvanized steel sheet conventionally used as the sliding surface of the extended floor slab, and has excellent sliding properties. Yes. In addition, a sheet-shaped resin member that is lightweight and has good workability, such as a foamed polyethylene plate, is used for the slip-off preventing member 4.

  FIG. 2 is an enlarged view of part A of the sliding surface structure shown in FIG.

  As shown in the figure, a pair of shear keys 23 having a height T1 smaller than the plate thickness T2 of the rubber plate 3 and step surfaces 22a and 22b facing each other are provided on the lower surface 21 of the extended floor slab 2. 3 in the sliding direction of the rubber plate 3 (for example, the expansion / contraction direction of the expansion / contraction device 5) with a distance D substantially equal to the length of the rubber plate 3 in the sliding direction. The rubber plate 3 is disposed between the stepped surfaces 22a and 22b of the pair of shear keys 23, whereby the relative movement with respect to the extended floor slab 2 is restricted and fixed to the extended floor slab 2. The lower surface of the rubber plate 3 protrudes from the lower surface of the extended floor slab 2 and comes into contact with the upper surface of the bottom plate 1. For this reason, as the extended floor slab 2 moves, the rubber plate 3 slides on the upper surface of the bottom slab 1.

  Further, in the gap between the bottom slab 1 and the extended floor slab 2 formed on both sides in the sliding direction of the rubber plate 3 protruding from the lower surface of the extended floor slab 2, a slip-off preventing member 4 for closing the gap is disposed. Yes. Thus, the rubber plate 3 is prevented from falling off between the extended floor slab 2 and the bottom plate 1 beyond the step surfaces 22a and 22b of the shear key 23, and the rubber plate 3 is slid by sliding between the rubber plate 3 and the bottom plate 1. The rubber powder generated by the wear of 3 is prevented from being discharged from the gap between the bottom slab 1 and the extended floor slab 2.

  The bottom slab 1 and the extended floor slab 2 may be formed of, for example, on-site concrete or precast concrete. The sliding surface structure of the bottom slab 1 and the extended floor slab 2 is, for example, a rubber plate 3 and a slip-off preventing member 4 thinner than the rubber plate 3 are laid in a predetermined layout in a mold, and the extended floor slab is formed thereon. 2 is formed.

  In the present embodiment, the bottom slab 1 is disposed on the abutment 61 and the earthwork part 62, and the extended floor slab 2 connected to the existing floor slab 64 of the bridge 63 and extending from the end of the bridge 63 to the earthwork part 62 side is provided. By placing the bridge plate 63 on the bottom plate 1, the installation position of the expansion / contraction device 5 such as a finger joint for connecting the bridge 63 to the earthwork portion 62 in a telescopic manner is moved from the gap portion 66 between the bridge 63 and the abutment 61 to the earthwork portion 62 side. Has moved. As a result, noise, vibration, and the like generated from the idle space 66 when the vehicle is running are reduced.

  Moreover, in this Embodiment, the sliding surface of the extended floor slab 2 is comprised using the rubber plate 3 which has slidability. For this reason, the sliding surface of the extended floor slab 2 is not corroded by the intrusion of rainwater from the pavement surface 65. In addition, the specific gravity of the steel plate is about 7.8, whereas the specific gravity of the rubber plate 3 is about 1.5. The rubber plate 3 is lighter than the steel plate even when the plate thickness T2 is double that of the steel plate. It does not require a large machine or the like and is easier to construct than steel plates. Therefore, the vertical movement of the extension slab 2 due to the vibration of the bridge 63 is improved by increasing the thickness T2 of the rubber plate 3 and increasing the gap between the extension slab 2 and the bottom slab 1 while improving workability. In this case, the possibility that the extended floor slab 2 collides with the end portion (B portion in FIG. 1) of the bottom slab 1 can be reduced, and the corner chipping of the bottom slab 1 can be prevented. Moreover, since the vertical movement of the extended floor slab 2 can be absorbed by the elastic force of the rubber plate 3, the influence on the bottom slab 1 due to the vertical movement of the extended floor slab 2 can be reduced. Therefore, according to the present embodiment, it is possible to provide a sliding surface structure of an extended floor slab that is excellent in workability and can improve durability. Further, since the rubber plate 3 is less expensive than the steel plate, the construction cost can be reduced.

  The embodiment of the present invention has been described above.

  In addition, this invention is not limited to said embodiment, Many deformation | transformation are possible within the range of the summary.

  For example, in the above embodiment, the sliding surfaces of the bottom plate 1 and the extended floor slab 2 are formed by a single rubber plate 3, but the present invention is not limited to this. A plurality of rubber plates 3 may be arranged in the sliding direction of the extended floor slab 2 or in a direction perpendicular to the sliding direction to constitute a sliding surface, or the plurality of rubber plates 3 may be arranged in the vertical direction. They may be stacked to form a sliding surface.

  A plurality of rubber plates 3 are arranged at predetermined intervals in the sliding direction of the extended floor slab 2 along a direction perpendicular to the sliding direction of the extended floor slab 2, and the bottom slab 1 and the extended floor When the sliding surface with the plate 2 is configured, as shown in FIG. 3, step surfaces 22 a and 22 b facing each other are provided on the lower surface 21 of the extended floor plate 2 for each rubber plate 3. You may arrange | position between corresponding level | step difference surfaces 22a and 22b. Then, a slip-off preventing member 4 may be disposed in the gap between the bottom plate 1 and the extended floor plate 2 formed between the rubber plate 3 and the rubber plate 3. By adopting such a layout, for example, deformation of the rubber plate 3, lateral displacement of the rubber plate 3, etc. can be more effectively reduced. Further, since the rubber plate 3 can be processed more easily than the steel plate, such a layout can be realized at a low cost.

  In addition, as shown in FIG. 4, when a plurality of rubber plates 3a and 3b are stacked in the vertical direction to form the sliding surface of the extended floor slab 2, the first rubber plate 3a disposed on the bottom plate 1 side The friction coefficient is set lower than the friction coefficient of the second rubber plate 3b arranged on the extended floor slab 2 side, while the elastic coefficient of the second rubber plate 3b arranged on the extended floor slab 2 side is arranged on the bottom plate 1 side. It is preferable to make it lower than the elastic modulus of the first rubber plate 3a. Generally, the hard rubber has a lower coefficient of friction as the hardness (elastic coefficient) is higher. Therefore, the first rubber plate 3a having a high hardness is disposed on the bottom plate 1 side, while the second rubber plate 3b having a low hardness is disposed on the extended floor plate 2 side, thereby arranging the first rubber plate 3a on the bottom plate 1 side. The elastic coefficient of the second rubber plate 3b disposed on the extended floor slab 2 side is lowered while maintaining the high slidability with respect to the bottom slab 1 by reducing the friction coefficient of the rubber plate 3a. The vertical movement of the plate 2 can be efficiently absorbed and the influence on the bottom plate 1 can be reduced. In this case, in order to fix the first rubber plate 3a arranged on the bottom plate 1 side to the extended floor slab 2 by the step surfaces 22a and 22b facing each other of the pair of shear keys 23, the extended floor slab is used. The thickness T3 of the second rubber plate 3b disposed on the second side is preferably smaller than the height T1 of the step surfaces 22a and 22b.

  In the above-described embodiment, the extended floor slab 2 is driven from above the rubber plate 3 to hold the rubber plate 3 between the stepped surfaces 22a and 22b of the pair of shear keys 23 facing each other. If the rubber plate 3 can be fixed with an appropriate strength, the rubber plate 3 may be fixed to the extended floor slab 2 by another fixing method using an adhesive, an anchor, or the like.

  The surface of the rubber plate 3 may be subjected to a surface treatment that reduces the friction coefficient.

  In the above, the sliding surface is formed with the rubber plate 3 on the extended floor slab 2 side. However, depending on the case, for example, the sliding surface may be formed with the rubber plate 3 on the floor slab 1 side. A sliding surface may be formed with the rubber plate 3 on both the extended floor slab 2 and the floor slab 1.

1: bottom plate, 2: extended floor slab, 3, 3a, 3b: rubber plate, 4: slip-off prevention member, 5: expansion and contraction device, 21: bottom surface of extended floor slab 2, 22a, 22b: step surface, 23: shear key 61: Abutment 62: Earthworking part 63: Bridge 64: Existing floor slab 65: Pavement surface 66: Spacing part

Claims (6)

A sliding surface structure of a bottom plate installed on the abutment and the earthwork part, and an extended floor slab that extends from the end of the bridge to the earthwork part side and slides on the bottom plate,
At least one of the bottom slab and the extended floor slab includes a slidable rubber plate disposed between the bottom slab and the extended floor slab as a sliding surface sliding with the other. Sliding surface structure of bottom plate and extended floor slab. A sliding surface structure between the bottom slab and the extended floor slab according to claim 1,
On the lower surface of the extended floor slab, a pair of stepped surfaces having a height smaller than the thickness of the rubber plate are formed facing each other,
The rubber plate is disposed between a pair of the stepped surfaces formed on the lower surface of the extended floor slab. A sliding surface structure between a bottom plate and an extended floor slab. The sliding surface structure of the bottom slab and the extended floor slab according to claim 1 or 2,
In the gap between the bottom plate and the extended floor slab formed by arranging the rubber plate between the bottom plate and the extended floor slab, a member for preventing the rubber plate from coming off is disposed to close the gap. The sliding surface structure of the bottom slab and the extended floor slab. A sliding surface structure between the bottom slab and the extended floor slab according to any one of claims 1 to 3,
The rubber plate is formed of hard rubber. A sliding surface structure of a bottom plate and an extended floor plate. A sliding surface structure between the bottom slab and the extended floor slab according to any one of claims 1 to 4,
The rubber plate is
A first rubber plate disposed on the bottom plate side;
A second rubber plate disposed on the extended floor slab side,
The first rubber plate has a lower coefficient of friction than the second rubber plate,
The sliding structure of the bottom slab and the extended floor slab, wherein the second rubber plate has a lower elastic coefficient than the first rubber plate. A method for constructing a sliding surface structure between a bottom plate installed on an abutment and an earthwork part, and an extended floor slab extending on the earthwork part side from an end of the bridge and sliding on the bottom plate,
A rubber plate having slidability is disposed between the bottom plate and the extended floor slab, and the rubber plate forms a sliding surface that slides on at least one of the bottom plate and the extended floor slab. A construction method of a sliding surface structure between a bottom slab and an extended floor slab.

Images