JPH108412A - Buried joint member of road bridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a buried joint member of a paving part, which can be continuously provided extending over both sides in an expansion play of a bridge, has satisfactory durability, and can support load of a passing vehicle of a joint gap part between bridge girders. SOLUTION: A buried joint member 1 is provided between the bottom of a paving part 9 constructed extending over both sides of an expansion lay of a bridge body formed by a girder 2 of a bridge and/or a bottom plate 2A and the bridge body and/or a land road to be buried in the paving part 9. In that case, the bureid joint member 1 comprises a sheet-like elastic body layer 11 which is an elastic body capable of following up the horizontally acting displacement, a connecting member 14 for connecting at least one end part of the elastic body layer to the bridge body and/or the land road, and a load support member 15 laid in such a manner as to stride over the expansion play part 5 of the bridge body for supporting an elastic body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pavement provided on a bridge body of a bridge girder portion of an expressway, a general road, and the like,
In particular, the present invention relates to a pavement portion of a bridge surface formed continuously without providing a telescopic device on a telescopic space of a bridge body.

[0002]

2. Description of the Related Art In recent years, when constructing a bridge,
Continuous girder formation in which one bridge girder extends over a plurality of piers is widely and generally employed. Such a multi-span continuous girder from which expansion joints have been removed as much as possible has many advantages, such as improvement of the running performance of the vehicle on the girder, reduction of maintenance man-hours and cost, improvement of earthquake resistance, and the like. These facts are more remarkable as the length of the bridge girder is increased. However, the bridge girder has (1) expansion and contraction due to temperature change,
(2) In addition to the rotational deformation of the end of the main girder due to the load deflection,
(3) Especially when it is a concrete girder or a prestressed concrete girder, deformation such as shrinkage due to drying of concrete and (4) shrinkage due to creep occur, and the horizontal force resulting from these temporal deformations is generated. Acts on the bridge girder, and horizontal force generated by vehicle braking, earthquake, etc. also acts on the pier, causing expansion and contraction between the bridge girder.

In some cases, a telescopic device such as a finger joint that disperses and absorbs the expansion and contraction is installed on the bridge surface in the expansion and contraction space, but such a telescopic device remarkably increases the comfort in running the vehicle. Lower. In addition, the sudden increase in traffic on the roads and the weight of vehicles in recent years tend to cause damage to the telescopic device itself and its nearby structural parts. Has become a big problem. As a method for solving such a problem, there has been proposed a continuous pavement construction method for a bridge surface in which a pavement portion of a bridge surface is continuously formed between a bridge girder and an abutment and between a bridge girder and a bridge girder. In this continuous pavement method for a bridge surface, a pavement made of an asphalt mixture is continuously provided on both sides of a bridge girder during expansion and contraction, and a sliding sheet is laid on a bridge body made of a girder and / or a floor slab. And a pavement portion formed by laminating an asphalt mixture having a net-like stress transmitting member embedded therein.

[0004] When pavement is constructed between the bridge girder and the abutment or in the vicinity of the extension space between the bridge girder and the bridge girder by such a method, the surface of the sliding sheet becomes a horizontal sliding surface, and the boundary is formed by the boundary. The bridge body and the pavement can be slid. Therefore, when the girder expands and contracts and the play changes, not only does the pavement on this play generate significant distortion, but also the distortion occurs in the area where the pavement on both sides of the play is slidable on the bridge. Distributed. That is, as shown in FIG. 3, the bridge girders 101, 101 contract, and the telescopic play 104 (the play length D
Even when o) is enlarged (after expansion play length D), the pavement section 102 slides in the range L where the sliding sheet is laid, instead of deforming only the portion above the expansion and contraction play space. The change amount ΔL (ΔL = t ₃ + t ₄ ) is absorbed by the pavement portion having the entire length of the range L in which the sliding sheet is laid. Accordingly, local excessive deformation and stress are not generated in the pavement portion 102, and a flat and durable running surface can be maintained even if the pavement portion is continuously formed on both sides during the expansion and contraction.

The mesh-shaped stress transmitting member 103 buried in the asphalt mixture transmits the stress acting on the pavement when the girder expands and contracts to the entire area where the sliding sheet is laid, and locally increases the stress. It has a role to disperse so as not to generate stress and to reinforce a pavement portion made of an asphalt mixture.

[0006]

However, the above-mentioned conventional pavement on the bridge surface has the following problems. Since the pavement can be slid on the bridge in the area where the sliding sheet is provided in the vicinity of the extension play, when the bridge expands and contracts, the distortion of the pavement is dispersed in the area where the sliding sheet is applied. . However, the sliding sheet also has friction, and the strain is not completely dispersed due to the frictional force, and the horizontal stress acting on the pavement in the vicinity of the expansion / contraction space is maximized. In addition, horizontal stress acts due to the wheel load caused by the passage of the vehicle, and when these forces act, fine cracks are more likely to occur in the pavement portion in the vicinity of the expansion and contraction space than in other portions. Even if a fine crack is formed on the pavement, no problem occurs immediately, but the crack is enlarged by the repeated application of the wheel load.

The present invention has been made in view of the above-mentioned problems, and can be provided continuously on both sides of a bridge during expansion and contraction, has sufficient durability, and has a clearance between bridge girders. It is an object of the present invention to provide a buried joint member of a pavement part capable of supporting a load of a vehicle passing through the part.

[0008]

In order to solve the above problems, a buried joint member of a road bridge according to the first aspect of the present invention is provided with a bridge body comprising a bridge girder and / or a floor slab. In a buried joint member provided between the bottom of a pavement part provided on both sides and a bridge body and / or a land road and buried in the pavement part, the buried joint member is subjected to a displacement acting in a horizontal direction. A sheet-like elastic body layer which is an elastic body that can follow, a connecting member having at least one end of the elastic body layer connected to the bridge body and / or a land road, and a stretching part of the bridge body. And a load supporting member that spans over and supports the elastic body.

According to a second aspect of the present invention, there is provided a buried joint member of a road bridge according to the first aspect, wherein the buried joint member of the pavement portion can be bonded to the upper surface of the elastic layer. An adhesive layer as an adhesive member is provided.

Further, the buried joint member of the road bridge according to the invention of claim 3 is the buried joint member of the pavement portion according to claim 1, wherein the lower surface of the elastic layer is in a horizontal direction with respect to the bridge body. And a sliding layer is provided for sliding.

The elastic layer constituting the buried joint member may be a general vulcanized rubber that transmits stress, and the rubber material of the rubber composition may be natural rubber, SB, or the like.
Typical rubbers such as R, BR, IR, CR, IIR, NBR and the like can be mentioned. The rubber composition includes a rubber material 10
10 to 150 parts by weight of carbon black is blended with respect to 0 parts by weight. Carbon black is used as a filler, whereby the effect of improving various physical properties is enhanced. The carbon black used is FE
Carbon black such as F, SRF, HAF, ISAF, and SAF. Further, a vulcanizing agent is used in the rubber composition, and the vulcanizing agent is generally sulfur, but there is no particular limitation such as a peroxide. Further, a vulcanization accelerator is used. Examples of the vulcanization accelerator include MBT (2-mercaptobenzothiazole), CBS (N-cyclohexyl-2-benzothiazylsulfenamide), MBTS (dibenzothiazyldisulfide) and the like. And thiurams such as TMTD (tetramethylthiuram disulfide).

Further, a reinforcing core layer may be provided inside the elastic layer so that the elastic layer can follow a displacement acting in the horizontal direction. The core layer is preferably a twisted cord or canvas made of synthetic fiber or fiber such as steel.

Further, since the connecting member is a means for fixing both ends of the buried joint member to the bridge body, the fixing portion is desirably made of a material which can withstand the holding strength of the anchor bolt to be fixed, and is preferably made of fiber reinforced resin or steel. Something is good.

Further, since the sliding layer is provided between the telescopic gap portion of the bridge body and the rigid plate having rigidity which can support the sliding layer so that the sliding layer does not fall into the idle portion due to wheel load or the like. Desirably, a steel plate or the like is suitable.

The adhesive layer is desirably a vulcanized rubber having a high affinity for asphalt, which is easily adhered or adhered to a pavement member mainly composed of an asphalt mixture, and CR, NBR or CSM is selected as the rubber material. Further, a rubber composition obtained by previously blending asphalt into the rubber material used for the elastic layer may be vulcanized. Further, a resin or a blend composition with a resin / rubber composition may be used. In this case, EVA (ethylene vinyl acetate), EEA (ethylene ethyl acrylate) and the like are preferable as the resin. As another material, the surface layer of the above general vulcanized rubber may be chlorinated by chlorination to be chemically activated to increase the affinity of the pavement member with asphalt. A sheet or film made of these materials is used as an adhesive layer.

Next, the material of the sliding layer which slides in the horizontal direction desirably has a small coefficient of friction with respect to the sliding, such as TEF (mono-tetrafluoroethylene) and UHMW-P.
Examples include resin films or sheets such as E (ultra high molecular weight polyethylene), polyamide, polyolefin, and polyester, plate-shaped special rubber, and ceramic tile.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

[0018]

FIG. 1 is a sectional view showing a buried joint member 1 on a bridge surface according to an embodiment of the present invention. Bridge girder 2 which is a bridge body made of concrete is provided on the upper surface of floor slab 2A,
Each base part is fixed and supported by a seismic isolation device 4 installed on the surface of the pier 3, and further, each end part is provided with a play part forming a telescopic play space 5, and is provided above the play part. , A backup material 6 for preventing leakage of rainwater or the like and a joint material 7 are opposed to each other. The buried joint member 1 of this bridge surface is provided in a range of length L on both sides of the telescopic play 5 between the bridge girders 2 and 2, and at both ends of this range, the buried joint member 1 is anchored by the anchor 8 and the floor slab of the bridge girder 2. 2
A. Further, asphalt pavement portions 9 are formed on the floor slab 2A of the bridge girder 2 including the buried joint member 1 by installing a pavement material made of an asphalt mixture. In this case, it is desirable that the pavement portion 9 paved on the upper surface of the buried joint member 1 be a pavement portion 9A which is a pavement material made of modified asphalt.

FIG. 2 is a cross-sectional view of the buried joint member 1 on the bridge girder surface. The buried joint member 1 has a reinforcing core layer 10 such as a twisted cord made of a fiber such as synthetic fiber or steel or a canvas. Above and below, an elastic layer 11 made of a sheet-like vulcanized rubber is formed. Further, on the surface of the upper elastic layer 11, a sheet-like adhesive layer 12 which is easily adhered or adhered to a pavement member mainly composed of an asphalt mixture is laminated. On the other hand, a sliding layer 13 that slides in the horizontal direction is laminated on the surface of the lower elastic layer 11. At both ends of the buried joint member 1, connecting members 14 for fixing the buried joint member 1 to the floor slab 2 </ b> A of the bridge girder 2 are integrally formed with the lower elastic layer 11. The connecting member 14 is provided with a through hole 14A for the fixing anchor bolt 8. Further, a load supporting member 15 which is a hard plate for preventing the buried joint member 1 from falling into the play portion across the play portion of the telescopic play space 5 is provided on the lower surface of the central portion of the buried joint member 1.

When manufacturing the buried joint member 1,
First, the UHM which constitutes the sliding layer 13 on the flat forming table
W-PE (ultra high molecular weight polyethylene, molecular weight 100 to 6
The film or the sheet of (00000) is placed, a load supporting member 15 is provided on the central portion thereof, and two connecting members 14 are further provided on both ends thereof. The load supporting member 15 and the connecting member 14 are coated in advance with a rubber composition in order to further strengthen the adhesion with the elastic layer described later and to absorb the vibration of the vehicle. Next, a sheet-like unvulcanized rubber composition in the form of a sheet is placed on these members as an elastic layer 11 and temporarily bonded with a pressure roller. Further, a core reinforcing layer 10 such as a twisted cord or canvas made of fibers such as synthetic fibers or steel, a non-vulcanized rubber composition 11 and an adhesive layer 12 are laminated thereon while being successively pressed to form an embedded joint member 1. Is preformed. Next, a press equipped with a heat source supply device such as steam that can move up and down
Install the lower heating plate. The buried joint member 1 in which the above members are integrally formed can be obtained by inserting the above-mentioned intermediate body between the upper and lower hot plates and pressing and heating (vulcanizing) the upper and lower hot plates. In this case, the vulcanization temperature is 160 ° C
The following is preferred.

Next, the operation of the embodiment of the present invention will be described. In such a buried joint member 1 of a bridge girder, the sliding layer 13 provided on the buried joint member 1 allows the buried joint member 1 to slide between the connecting members 14 without being restrained by the bridge girder. Therefore, the bridge girder 2 expands or contracts due to a temperature change or the like.
Then, even if the play length 5 changes, the deformation and stress of the pavement portion 9 are evenly distributed in the range L where the buried joint member 1 is provided, and the pavement portion 9 is not deformed or cracked. Such a state suitable for traveling is maintained.
Further, the stress dispersed by the sliding layer 13 and transmitted to the bottom of the buried joint member 1 further reduces the lower elastic layer 11,
The power is transmitted to the pavement portion 9A uniformly bonded to the reinforcing core layer 10, the upper elastic layer 11, and the adhesive layer 12, but is distorted by the elastic layer 11 and the adhesive layer 12 made of flexible vulcanized rubber. Are dispersed and absorbed, and the degree of stress transmitted to the pavement portion 9A is reduced. Therefore, local reflection cracks such as cracks and cracks in the pavement portions 9 and 9A can be prevented. In addition, since it is highly flexible, it can be prevented from being damaged by deformation due to an earthquake or the like, and can also absorb running vibration of the vehicle to prevent noise and protect the pavement portions 9 and 9A. Further, since the core reinforcing layer 10, elastic layer 11, adhesive layer 12, sliding layer 13, connecting member 14, and load supporting member 15 constituting the buried joint member 1 are integrally formed in a factory in advance, The construction of the pavement sections 9 and 9A can be performed extremely easily and quickly.

[0022]

As described above, the buried joint member of the road bridge according to the present invention has the above-described structure, and therefore can be provided continuously on both sides of the expansion and contraction of the bridge. It is possible to provide a buried joint member of a pavement portion having durability and capable of supporting a load of a vehicle passing through a gap between bridge girders.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a buried joint member of a road bridge according to an embodiment of the present invention.

FIG. 2 is a sectional view of a buried joint member of the road bridge according to the embodiment.

FIG. 3 is an explanatory view showing a configuration when a buried joint member and a pavement member are continuously provided on both sides of a telescopic play.

[Explanation of symbols]

1, 103 buried joint member (stress transmitting member) 2, 101 bridge girder 2A, 101A floor slab 3 pier 4 seismic isolation device 5, 104 telescopic play space 6 backup material 7 joint material 8 anchor bolt 9, 9A, 102 pavement part 10 reinforcing core Body layer 11 Elastic layer 12 Adhesive layer 13 Sliding layer 14 Connecting member 14A Through hole 15 Load support member D Playing length after enlargement D ₀ Playing length L Buried joint member length

Claims (3)

[Claims] The pavement is provided between a bottom of a pavement provided on both sides of a stretch of a bridge made of a bridge girder and / or a slab and a bridge and / or a land road. In a buried joint member to be buried, the buried joint member is a sheet-shaped elastic body layer which is an elastic body capable of following a displacement acting in a horizontal direction, and at least one end of the elastic body layer is the bridge body. And / or a connecting member connected to a land road, and a load supporting member that is bridged over a telescopic play portion of the bridge body and supports the elastic body. Buried joint members. 2. The buried joint member for a pavement part according to claim 1, wherein an adhesive layer is provided on an upper surface of the elastic layer, the adhesive layer being an adhesive member that can be adhered to the pavement part. Item 2. A buried joint member for a road bridge according to item 1. 3. The buried joint member for a pavement according to claim 1, wherein a sliding layer is provided on a lower surface of the elastic layer so as to slide in a horizontal direction with respect to the bridge body. A buried joint member for a road bridge according to claim 1.