JPH07166506A - Bridge deck pavement - Google Patents

Abstract

PURPOSE:To obtain a pavement which can be continuously laid down over both sides between extensible clearances of a bridge body on a highway bridge and which does not cause cracks and extreme deformation and further, increases durability. CONSTITUTION:A slide layer 4 which can slide horizontally against a bridge body 1, is laid at the bottom of a pavement. A net-form material 6 having relatively fine meshes is laid down on this slide layer and a base course 8 made of an asphalt mixture is settled thereon. A net-form stress-transmission member 7 dispersing horizontal stresses and reinforcing the asphalt mixture of the pavement is embedded in the base course. And a surface course 9 is formed on the binder course through a strain-dispersion sheet 10. Reinforcing fibers 10 in which glass fibers are woven to form a net into a rubber-like asphalt formed thin like a sheet is embedded in the strain-dispersion sheet in order to disperse stresses transmitted from the base course to the surface course and also reinforce the surface course. And the strain-dispersion sheet prevents rain water from penetrating into the base course.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pavement installed on a bridge body of a bridge portion on a highway, a general road, etc.
In particular, the present invention relates to a pavement body on a bridge surface that is continuously formed without providing an expansion device or the like on the expansion / contraction space of the bridge body.

[0002]

2. Description of the Related Art Generally, an expansion / contraction space is provided between a bridge girder and an abutment or between a bridge girder and a bridge girder in consideration of expansion and contraction of the bridge girder due to temperature change, concrete creep, drying shrinkage and the like. An expansion device is often used for the pavement section on the expansion play so that the continuity of the bridge surface is maintained even if the bridge girder expands and contracts. However, when such a telescopic device is used, the pavement becomes discontinuous between the bridge girders and abutments or between the bridge girders and the bridge girders, and the traveling performance of the vehicle deteriorates. Further, the expansion and contraction device has been seriously damaged due to the rapid increase in traffic volume and the weight increase of vehicles in recent years, which causes a problem in road maintenance.

As a method for solving such a problem, a continuous pavement method for a bridge surface has been proposed in which a pavement body on the bridge surface is continuously installed between the bridge girder and abutment, and between the bridge girder and the bridge girder.
For example, there is one described in Japanese Patent Publication No. 3-26724. The continuous pavement method for this bridge surface is to install paving made of asphalt mixture continuously over both sides of the expansion and contraction space of the bridge girder, and lay a sliding sheet on the bridge made of girders and / or floor slabs. Then, a pavement is formed by laminating an asphalt mixture in which a mesh-shaped stress transmitting member is embedded thereon.

When the pavement between the bridge girders and abutments or near the expansion gap between the bridge girders and the bridge girders is constructed by such a method, the surface of the sliding sheet becomes a horizontal sliding surface, and it becomes a boundary. In addition, the bridge and pavement can slide. Therefore, when the girder expands and contracts and the play space changes, not only the pavement on this play space will experience large strain, but the strain will be dispersed in the range where the pavement on both sides of the play space can slide on the bridge. To be done. That is, as shown in FIG. 8, the bridge girders 101 and 101 contract, and the expansion and contraction clearance 104
Even when the (playing space length Do) is expanded (after playing, the playing space length D), the pavement 102 is not deformed only in the portion above the expansion play space, but is in the range L where the sliding sheet is laid.
And slide in this range ΔL (ΔL = t ₃ + t ₄ ).
Will be absorbed by the pavement having the entire length in the range L in which the sliding sheet is laid. Therefore, the pavement 10
No excessive deformation or stress is locally generated in 2, and a flat and durable running surface can be maintained even if pavements are continuously formed on both sides of the expansion play.

The mesh-like stress transmitting member 103 embedded 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. It has a role to disperse so as not to generate a large stress and to reinforce a pavement made of an asphalt mixture.

[0006]

However, the above conventional pavement for bridge surface has the following problems. As the pavement is slidable on the bridge in the range where sliding seats are provided near the expansion and contraction spaces,
When the bridge expands and contracts, the strain of the pavement is dispersed in the range covered by the sliding sheet. However, the sliding sheet also has friction, the strain is not completely dispersed by this frictional force, and the stress in the horizontal direction acting on the pavement is maximized in the vicinity of the expansion and contraction play. In addition, horizontal stress also acts due to wheel load due to passing of the vehicle, and when these forces act, near the expansion and contraction play,
Fine cracks are more likely to occur in the pavement than in other parts. Even if minute cracks are generated in the pavement, it does not cause any trouble immediately, but the cracks expand due to repeated wheel loads. Also, the growth of cracks is promoted by the penetration of rainwater, the aggregate in the asphalt mixture peels off, the surface layer of the pavement cracks and falls off,
There is a hole called a pothole on the pavement surface. In this way, the pavement that is continuously provided near the expansion and contraction spaces,
It has a problem that it is inferior in durability as compared with other parts.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a pavement body which can be continuously provided on both sides of the expansion and contraction play of the bridge and has sufficient durability. Is to get.

[0008]

In order to solve the above-mentioned problems, the invention according to claim 1 is an asphalt which is installed on a bridge body composed of bridge girders and / or floor slabs and contains aggregates. A pavement for a bridge surface having a base layer containing a mixture as a main material and a surface layer laminated on the base layer, the paving body being provided at the bottom of the base layer and sliding horizontally with respect to the bridge body. A sliding layer that enables the above, a stress transmission member that is embedded in the asphalt mixture that forms the base layer, and that can resist the tensile force that acts in the horizontal direction, and a mesh in a sheet-shaped flexible asphalt-based material. It is a member having a reinforcing fiber embedded therein and has a strain dispersion sheet interposed between the base layer and the surface layer.

The invention according to claim 2 is the pavement for a bridge surface according to claim 1, wherein the bone is embedded between the first sliding layer and the stress transmitting member and is included in the asphalt mixture. The stress transmission member has a net-like body that cannot pass through at least a part of the material, and the stress-transmitting member is provided with a lifting preventing means for keeping the distance from the net-like body unchanged.

The sliding layer is formed by laying sheet-like members substantially horizontally between the upper surface of the bridge and the pavement or near the bottom of the pavement. Two sheet-like members are laminated. However, it is desirable to allow horizontal sliding between these two sheet-shaped members. Moreover, you may apply lubricating oil etc. between sheet-shaped members. It is desirable that the material used for the surface of the sheet-shaped member has a coefficient of friction that is small against sliding, so select an appropriate material such as a thin metal layer, a metal foil, a thin metal plate, a synthetic resin film, paper, cloth, or non-woven fabric. You can However, when two sheet-like members are used in a laminated manner, it is desirable to use different kinds of materials in combination in order to obtain the effect of reducing the friction coefficient.

The stress transmitting member may be made of metal or high-strength fiber formed in a mesh shape. A steel plate having a width in the vertical direction is bent horizontally and joined in a honeycomb shape. In addition, intermittently cut lines on the steel plate,
It is possible to use so-called expanded metal, welded wire mesh, or the like that is drawn to form a mesh. Further, in the stress transmitting member in which the strip-shaped steel plates are joined in a honeycomb shape, it is desirable to appropriately provide openings in the steel plates partitioning the through holes.

The asphalt-based material used for the strain dispersion sheet is, for example, rubber added to asphalt,
Further, a rubber asphalt compound (rubberized asphalt) to which oils and fats are added can be used. Also,
As the reinforcing fiber, for example, carbon fiber, glass fiber woven in a mesh shape, or a net of steel or stainless steel can be used. Further, in the invention according to claim 2, the floating preventing means is fixed to the stress transmitting member, for example, a plate material having a portion projecting in a substantially horizontal direction, and the floating member is bridged substantially horizontally to the stress transmitting member and locked. The plate member or the stress transmitting member may be a binding means for connecting the mesh body.

[0013]

The pavement body on the bridge surface according to the invention of claim 1 is
If it is provided continuously on both sides of the expansion play, the sliding layer allows the bridge and the upper part of the pavement to slide horizontally, so even if the expansion play changes. The pavement slides on the bridge, and the horizontal strain and stress are dispersed so that excessive deformation and stress are not generated only in the upper part of the expansion and contraction space. At this time, the stress transmission member embedded in the base layer transmits the force acting on the pavement to a wide range in accordance with the change in play, and prevents a large stress from acting locally. Further, the stress transmitting member reinforces the base layer made of the asphalt mixture, and prevents the pavement from cracking due to the tensile stress in the horizontal direction.

Further, although the stress is transmitted from the base layer to the surface layer, a strain dispersion sheet made of a flexible asphalt-based material is interposed between the base layer and the surface layer, and the reinforcing fiber is contained in the strain dispersion sheet. Since the base is embedded, the stress transmitted from the base layer to the surface layer is borne by the reinforcing fiber. At the same time, the strain is absorbed by the flexible asphalt material, and the dispersibility of the strain is improved. As a result, the stress in the horizontal direction acting on the surface layer of the pavement is reduced, and cracks are less likely to occur. Further, the strain-dispersion sheet prevents rainwater from penetrating into the base layer, promotes evaporation and drying from the surface, and prevents deterioration of the pavement due to rainwater.

In the pavement for the bridge surface according to the second aspect of the present invention, at least a part of the aggregate contained in the asphalt mixture cannot pass above the sliding layer provided near the bottom of the base layer. Since the mesh having fine lines is arranged, the mesh is integrated with the asphalt mixture forming the base layer, and the asphalt mixture near the bottom of the pavement is prevented from flowing in the horizontal direction. As a result, the deformation of the pavement, such as the formation of so-called "roaches", is reduced, the strain dispersion effect between the surface layer and the base layer is maintained for a long time, and the durability of the pavement is improved.

Further, by preventing the stress transmitting member from floating in the base layer, the stress transmitting member is always kept at the same distance as the mesh body laminated therebelow. As a result, the effect of preventing the flow of the asphalt mixture of the stress transmitting member and the mesh is combined, the flow from the middle layer to the bottom layer is effectively prevented, and the deformation of the pavement subjected to repeated wheel loads is reduced.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing a pavement body on a bridge surface which is an embodiment of the invention described in claim 1. This pavement on the bridge surface is provided on the top surface of the bridge body 1 made of concrete, and the first rubber asphalt compound layer 2 is laid in contact with the concrete surface, and aluminum foil is coated with polyester film on it. The reinforced smooth surface forming layer 3 is overlaid. A sliding sheet 4 in which a polyester film is attached to a non-woven fabric is laid on the sliding surface forming layer 3 to form a sliding layer. A second rubber asphalt compound layer 5 is laminated on the second rubber asphalt compound layer 5, and a steel wire net 6 is embedded in the second rubber asphalt compound layer 5 substantially horizontally.

Second rubber asphalt compound layer 5
On top of the base layer 8 is an asphalt mixture containing aggregate
Are laminated, and in this base layer 8, a stress transmission member 7 is embedded, which is formed by joining strip-shaped steel plate materials into a net shape. Base layer 8
A surface layer 9 made of an asphalt mixture is further provided on the upper surface of the base material, and a sheet-like rubber asphalt compound is provided between the base layer and the surface layer to form a mesh-shaped reinforcing fiber 10a.
The strain-dispersion sheet 10 in which is embedded is inserted.

As shown in FIG. 1 (b), such a pavement is provided in the range of length L over both sides of the expansion and contraction gap 15 between the two bridges 1, 1, and both ends of this range. The stress transmission member 7 is fixed to the bridge body 1 by the anchor 13. In addition, a backup material 1 is provided between the bridges in the expansion and contraction space.
1 and joint material 12 are inserted.

FIG. 2 shows the sliding layer of the pavement on the bridge surface, first.
FIG. 3 is an enlarged view showing a rubber asphalt compound layer 2, a second rubber asphalt compound layer 5, a steel wire net 6 and the like. The first rubber asphalt compound layer 2 has flexibility and can be laid so as to be adhered by pressing even if there is some unevenness on the upper surface of the bridge. The smooth surface forming layer 3 is adhered to the upper surface of the first rubber asphalt compound layer 2 and is formed by adhering an aluminum foil and a polyester film which reinforces the aluminum foil, and the aluminum foil becomes the surface (upper surface). It is pasted as.

The sliding sheet 4 is formed by laminating a polyester film on a non-woven fabric, and the non-woven fabric side is adhered to the lower surface of the second rubber asphalt compound layer 5 with the polyester film facing down. Second
The rubber asphalt compound layer (5) is as flexible as the first rubber asphalt compound layer (2), and a steel wire mesh (6) is embedded in the center of the layer thickness. This steel wire mesh has a wire diameter of 0.3 to 0.5
The mesh size is about 5 mm and the mesh size is about 5 mm.

On the upper surface of the second rubber asphalt compound layer 5, a mineral powder 14 such as silica sand is attached. When the base layer 8 is applied on the second rubber asphalt compound layer 5, the mineral powder 14 is taken into the heated asphalt mixture and adheres to the second rubber asphalt compound layer 5 and the base layer 8. Is to strengthen.

FIG. 3 is a perspective view showing the stress transmitting member 7 embedded in the base layer 8 made of an asphalt mixture. The stress transmitting member 7 is formed by bending a steel plate having a width in the vertical direction in the horizontal direction and combining a plurality of such steel plates. The hexagonal column-shaped space partitioned by the steel plates is formed in a honeycomb shape in the plane direction. Are arranged without any gaps, and this is a continuous mesh. This stress transmitting member 7
Is formed as follows.

The width is about 20 mm and the thickness is 0.5 mm.
A strip-shaped steel sheet material of about 1.0 mm is bent at about 30 mm intervals at two places by about 60 degrees, and at the subsequent two places by about 60 degrees in the opposite direction, and this is repeated. A large number of such strip-shaped steel sheet materials are arranged in parallel with each other in the width direction, and adjacent steel sheet materials are joined to each other so as to form a substantially regular hexagon on a plane. The joining method may be welding, or as shown in FIG. 3, an opening 7a may be provided in a strip-shaped steel plate material,
It is also possible to stack steel sheet materials to be joined, punch out the openings, and join by deforming the peripheral edge of the openings at this time. Such a stress transmitting member 7 is installed on the second rubber asphalt compound layer, and is bound with a wire rod so that the space between the steel wire net 6 and the steel wire net 6 does not expand in the vertical direction, or as shown in FIG. It is desirable to lock or fix the horizontal plate 7b to the stress transmitting member 7.

The base layer 8 laminated so as to embed the stress transmitting member 7 is an aggregate made of an asphalt mixture obtained by mixing asphalt with a material appropriately selected from crushed stone, gravel, sand, filler and the like. is there. Aggregate is appropriately mixed with gravel, sand, etc. to adjust the particle size distribution according to the traffic volume, environment, workability, etc. of the road. Further, petroleum asphalt can be used as the asphalt, and natural asphalt may be used according to demands such as workability. Surface 9
The asphalt mixture used in the above can also be formed by selecting materials so as to be suitable in the same manner as the above base layer.

As shown in FIG. 4, the strain dispersion sheet 10 inserted between the base layer and the surface layer has a thickness of 1.5 to.
A reinforcing material 10b woven from glass fiber in a mesh shape is embedded in a rubber asphalt compound 10a formed in a sheet shape of about 2.0 mm. Silica sand 10c is adhered to the upper surface of the rubber asphalt compound 10a, which makes the adhesion of the strain dispersion sheet 10 and the surface layer 9 good and facilitates the handling until installation. Further, this strain dispersion sheet 10 is manufactured in a factory, and a release paper 10d is attached to the lower surface side until it is laid in the field, and the adhesion between the strain dispersion sheets that overlap each other when being rolled into a roll is limited. However, it is easy to handle. At the time of laying, the release paper is peeled off and spread on the base layer so that the flexible rubber asphalt compound adheres to the asphalt mixture forming the base layer.

In such a pavement with a bridge surface, the sliding layer 4 provided at the bottom of the pavement allows the pavement to slide without being constrained by the bridge, so that the bridge may change due to temperature changes or the like. Even if the body stretches or contracts and the expansion and contraction gap 15 changes, the deformation and stress of the pavement are dispersed in the range L where the pavement of this embodiment is provided, and the pavement is excessively deformed or cracked. A state suitable for traveling of the vehicle or the like is maintained. Further, the stress dispersed by the sliding layer and transmitted to the bottom of the pavement is further transmitted from the base layer 8 to the surface layer 9, but the stress distribution sheet 10 interposed between the base layer 8 and the surface layer 9 is reinforced. The material 10b bears the tensile stress, and the flexible rubber asphalt compound 10a absorbs the strain, so that the stress transmitted to the surface layer 9 is reduced.

Further, the strain dispersion sheet also has a role of blocking the permeation of rainwater from the surface between the base layer 8 and the surface layer 9, and prevents deterioration due to permeation of rainwater into the pavement. be able to. Further, in the pavement body on the bridge surface of the present embodiment, since the relatively fine mesh body 6 is arranged on the upper side of the sliding layer, it is possible to prevent the bottom layer flow and the middle layer flow together with the stress transmission member 7, By bundling the stress transmitting member 7 and the mesh body 6 or by attaching the horizontal plate 7a to the stress transmitting member 7, the stress transmitting member 7 is prevented from floating on the surface side even when the wheel load is repeatedly applied. Therefore, the distance between the mesh body 6 and the stress transmission member 7 is always kept uniform, and the flow from the middle layer to the bottom layer is effectively prevented.

The strain-dispersing sheet may be provided over the entire road width within a predetermined range on both sides of the expansion and contraction play of the bridge, and as shown in FIG. 5, a wheel load with a lane width A frequently acts. It may be provided only in the wheel traveling zone B. In FIG. 5, reference numeral 15 is the expansion / contraction space, reference numeral 16 is the ground cover, reference numeral C.
Indicates the range in which the sliding layer is provided.

FIG. 6 is a sectional view showing a pavement body on a bridge surface which is a second embodiment of the invention according to claim 1 or 2. Also in this pavement, a first rubber asphalt compound layer 22, a smooth surface forming layer 23, which is similar to that shown in FIG.
It has a sliding sheet 24, a second rubber asphalt compound layer 25, a mesh 26, a base layer 28, a surface layer 29 and a strain dispersion sheet 30. In this embodiment, the stress transmitting member 27 is as shown in FIG. This is a so-called expanded metal in which intermittent cutting lines are put in parallel in a steel plate and stretched to form a net. Since this expanded metal has a small thickness in the vertical direction, it has to be arranged at a position where stress can be effectively transmitted in the base layer 28. It is supported at a predetermined height by the two nuts 33 and the support fittings 34 sandwiched between them. Even with such a pavement having a bridge surface, the same effect as that of the above-described embodiment can be obtained.

[0031]

As described above, in the bridge surface pavement according to the present invention, since the sliding layer is provided at the bottom and the stress transmitting member is embedded in the base layer, it is possible to continuously extend over both sides of the expansion play. Even if the pavement is provided, excessive deformation and stress will not occur, and the stress and strain transmitted to the pavement will be dispersed in the area where the sliding layer is provided, causing large cracks or cracks in the pavement on the expansion and contraction spaces. Can be prevented. Further, since the strain-dispersing sheet is interposed between the base layer and the surface layer, the stress and strain transmitted from the base layer to the surface layer are dispersed, and the reinforcing fiber bears the stress and occurs in the surface layer of the pavement. The tensile stress level can be reduced. This suppresses generation of fine cracks in the surface layer. Further, the strain-dispersing sheet prevents rainwater from penetrating into the base layer, and can reduce deterioration of the pavement due to permeated water. Therefore, a durable pavement can be obtained.

Further, by disposing a mesh having a relatively fine mesh on the upper side of the sliding layer, it is possible to effectively prevent the flow of the asphalt mixture in the bottom layer portion and the middle layer portion in the base layer, and at the same time, the stress transmitting member serves as the pavement. It is possible to reduce the deformation of the pavement by preventing the pavement from floating to the surface side. Along with this, the stress dispersion effect of the strain distribution sheet is maintained, and the durability of the pavement can be improved.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing a pavement body on a bridge surface which is an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view showing a configuration in the vicinity of a bottom portion of the pavement body on the bridge surface of the above embodiment.

FIG. 3 is a schematic perspective view showing a stress transmitting member used in the above embodiment.

FIG. 4 is an enlarged cross-sectional view showing a strain dispersion sheet used in the above examples.

FIG. 5 is a plan view showing an example of a range in which a strain distribution sheet is spread in the above embodiment.

FIG. 6 is a schematic cross-sectional view showing a pavement body on a bridge surface which is a second embodiment of the present invention.

FIG. 7 is a schematic perspective view showing a stress transmitting member used in the pavement body on the bridge surface of the embodiment shown in FIG. 6;

FIG. 8 is an explanatory view showing a configuration when paving bodies are continuously provided on both sides of the expansion play.

[Explanation of symbols]

 1 Bridge (concrete) 2,22 First rubber asphalt compound layer 3,23 Sliding surface forming layer 4,24 Sliding sheet 5,25 Second rubber asphalt compound layer 6,26 Reticulate body 7,27 Stress transmission member 8,28 Base layer 9,29 Surface layer 10 Strain dispersion sheet 11 Backup material 12 Joint material 13 Anchor 14 Mineral substance powder (silica) 15 Expansion and contraction space 16 Ground cover

Claims (2)

[Claims] 1. A pavement for a bridge surface, which is provided on a bridge body composed of bridge girders and / or floor slabs and has a base layer mainly composed of an asphalt mixture containing aggregates and a surface layer laminated thereon. A body, a sliding layer that is provided at the bottom of the base layer and that allows the pavement to slide horizontally with respect to a bridge, and is embedded in an asphalt mixture that forms the base layer,
A stress transmitting member capable of resisting a tensile force acting in a horizontal direction, and a member in which mesh-like reinforcing fibers are embedded in a sheet-shaped flexible asphalt-based material, and between the base layer and the surface layer. A pavement for a bridge surface, which has a strain-dispersing sheet interposed in the pavement. 2. The pavement for a bridge surface according to claim 1, wherein the pavement is embedded between the first sliding layer and the stress transmission member and can pass through at least a part of aggregate contained in the asphalt mixture. A pavement for a bridge surface, which has an unreticulated body, and wherein the stress transmission member is provided with a lifting prevention means for maintaining the distance from the reticulated body unchanged.