JPH1193106A - Paving structure for expansion spacing of highway bridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paving structure for an expansion spacing of a highway bridge in which cracks and swellings on the paving materials on an expansion spacing can be securely prevented even if a large displacement is brought in the expansion spacing. SOLUTION: An elastic plate 36 is laid to stride bridge bodies 30, 32 and a paving material 40 is executed on the elastic plate 36. Chords 42 are arranged in the elastic plate and a pretention is exerted through a tension bolt 56. Protrusions and recessions normal to the axis of the bridge are stretched on the upper face of the elastic plate 36. Metallic plates 74 are embedded in the elastic plate 36 at the underside of the protruded part and spines 78 are fixed to the upper ends of support rods 76 erected from the metallic plates 74. Slits 64 are formed in the paving material 40 at the upper side of the recessed part and an elastic material 66 is charged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pavement structure provided so as to straddle a gap of a road bridge. The present invention relates to a pavement structure having a paved material.

[0002]

2. Description of the Related Art In a road bridge, as is well known, a gap called a play is formed between ends of a girder in a bridge axis direction or between a girder and an abutment. This is because the expansion and contraction due to the temperature change of the girder and the displacement of the girder in the bridge axis direction at the time of earthquake or the like are absorbed by the clearance. As described above, since the play space expands and contracts in the bridge axis direction, the pavement on the play space formed so as to straddle the play space can also expand and contract following the expansion and contraction of the play space.

[0003] An expansion device (joint) such as a finger joint for absorbing the expansion and contraction may be installed on a bridge surface in the expansion and contraction space. However, such an expansion device is used for a traveling vehicle because a gap is exposed on a road surface. Impacts and significantly reduces the comfort of the vehicle. 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.

[0004] As a method of solving such a problem,
A continuous pavement method of 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 has been proposed.

In this continuous pavement method for a bridge surface, a pavement made of an asphalt mixture is continuously provided on both sides of a stretch of a bridge girder, and a sliding sheet is formed on a bridge body made of a girder and / or a floor slab. And a pavement portion is formed by laminating an asphalt mixture on which a mesh-shaped stress transmitting member is embedded.

[0006] 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. In other words, even when the bridge girder shrinks and the shrinkage play is expanded, the pavement does not deform only in the stretchable play, but slides in the area where the sliding sheet is laid. It will be absorbed by the entire length of the pavement in the area where the sliding sheet is laid.

[0007] Accordingly, local excessive deformation and stress are not generated in the pavement portion, and a flat and durable running surface can be maintained even if the pavement portion is formed continuously on both sides during expansion and contraction. .

The mesh-shaped stress transmitting member embedded in the asphalt mixture transmits the stress acting on the pavement portion when the girder expands and contracts to the entire area where the sliding sheet is laid, and locally generates a large stress. And has a role of reinforcing a pavement portion made of an asphalt mixture.

The applicant of the present invention has previously filed Japanese Patent Application No. 9-1035.
No. 73 proposes a pavement structure for a clearance section of a road bridge having a buried joint member capable of following displacements not only in the length direction of the road bridge but also in a right angle direction and a rotation direction.

FIG. 6 is a sectional view showing an embodiment of the same publication. The bridge girder 2 made of concrete has a floor slab 2 </ b> A on its upper surface, and is supported by a seismic isolation device 4 installed at the top end of a pier 3. The idle space 5 is provided with a backup material 6 and a joint material 7 for preventing leakage of rainwater or the like.

The buried joint member 1 of the bridge surface is provided so as to straddle a telescopic play portion 5 between the bridge girders 2 and 2.
Connecting member 8 tension bar 12 and anchor bolt 13
Is fixed to the floor slab 2A of the bridge girder 2 via the bridge.

An asphalt pavement 9 is formed on the floor slab 2A of the bridge girder 2 including the buried joint member 1.

FIG. 7 is a sectional view of the buried joint member 1 in which a reinforcing core layer 20 such as a twisted cord made of a fiber such as synthetic fiber or steel is buried in a rubber composition 21.

A sliding layer 2 is provided on the lower surface of the buried joint member 1.
3 are stacked. A load support member 11 is provided at the center of the buried joint member 1.

In such a structure, the buried joint member 1 is slidable with respect to the bridge girder 2 by the sliding layer 23 provided on the buried joint member 1, so that the bridge girder expands or contracts due to a temperature change or the like. The deformation and stress of the pavement member 24 are evenly distributed in the range L where the buried joint member 1 is provided even if the expansion / contraction space changes, and the pavement portion 4
Is prevented from being locally applied with a large stress.

The pavement core layer 20 is made of a twisted cord made of synthetic fiber or steel and has a bias angle θ of 45 ° to 7 °.
Since it is buried as shown in Fig. 8 with a bias in the range of 5 °, even if this buried joint member is pulled in the longitudinal direction, it is difficult to shrink in the width direction, and not only in the longitudinal direction of the road bridge but also in this direction. It can respond to the displacement acting in the direction perpendicular to and in the direction of rotation (torsion), and acts to prevent deformation of the sheet-like elastic layer.

As shown in FIG. 9, a plurality of grooves 27 for water outflow extending in the direction perpendicular to the bridge axis are formed on the lower surface of the buried joint member 1, and the grooves 27 between the grooves 27 are formed. The sliding layer 23 may be formed on the bottom surface of the buried joint member 1. By providing the concave stripes 27 in this manner, rainwater or the like on the floor slab can be made to flow off.

[0018]

As described above, in the pavement structure using the sliding sheet, when the play is shortened and the displacement is reduced, the sliding sheet and the asphalt thereon are also pushed in the bridge axis direction. Shrunk. When the compressive stress exceeds a limit value, asphalt is deformed so as to rise.

Further, when the elongation of the play exceeds the limit value, cracks occur in the asphalt.

According to Japanese Patent Application No. 9-103573, the stress applied to the asphalt pavement 9 on the buried joint member 1 is considerably alleviated, but when the displacement in the bridge axis direction of the play is still excessive, There is a possibility that a swell or a crack may occur in the pavement portion 9.

The present invention provides a pavement structure of a gap portion of a road bridge which is extremely durable without causing a swelling or cracking of the pavement material even with such a very large expansion and contraction of the gap. The purpose is to:

[0022]

According to the present invention, there is provided a pavement structure of a clearance section of a road bridge, wherein the pavement structure straddles the clearance section of the road bridge. A plate-like elastic body, and a pavement material formed on the elastic body,
A backing line supported by the elastic body and embedded in the paving material, and a plurality of slits are provided in the paving material at intervals in the bridge axis direction so as to extend in a direction crossing the bridge axis direction. The slit is filled with an elastic material, and the spine is disposed at a position between the slits.

In the pavement structure of the gap of the road bridge, when the gap expands and contracts in the bridge axis direction, the slit of the pavement material on the elastic body expands and contracts, and is added to the pavement material. Stress is relieved.

In the present invention, since the spine supported by the plate-like elastic body is buried in the pavement material, the integrity of the plate-like elastic body and the pavement material is high, and the spine is a bridge made of a pavement material. Reduce the expansion and contraction in the axial direction. Since the spine is provided at a position between the slits, when the plate-like elastic body expands and contracts in the bridge axis direction, the pavement material on the plate-like elastic body is in the bridge axis direction near the spine. It does not expand or contract so much, and this expansion stress concentrates on the portion near the slit without the spine. As a result,
Most of the expansion and contraction of the paving material on the plate-like elastic body is absorbed by the expansion and contraction of the slit in the width direction.

By extending the spine in the bridge axis direction, the expansion and contraction of the pavement material near the spine in the bridge axis direction can be significantly reduced.

In order to support this back muscle on the plate-like elastic body,
It is preferable that a metal plate is buried in the plate-like elastic body, a support bar is erected from the metal plate, and a back muscle is connected to the support bar.

According to the present invention, a plurality of ridges and ridges extending in the direction perpendicular to the bridge axis are provided on the upper surface of the plate-like elastic body to improve the integration between the elastic body and the paving material thereon. Is preferred. This makes it possible to sufficiently resist the shearing force applied to the interface between the elastic body and the paving material by the vehicle brake. In this case, it is preferable that the spine is disposed only above the ridge. Further, it is preferable that the slit is arranged above the concave ridge.

It is also preferable that the elastic body and the pavement material are bonded to each other to enhance the integrity of the two. In addition, it is preferable that sliding (sliding displacement) of the interface between the upper surface of the concave portion and the pavement material when the elastic body expands and contracts is allowed, and the shear stress generated near the interface is reduced.

In the present invention, it is preferable that the cord is buried in the plate-like elastic body and the cord is pre-tensioned so that the entire plate-like elastic body is sufficiently pre-tensioned in the bridge axis direction. By doing so, even if a large displacement occurs in the direction of shortening the play, no deformation occurs such that the upper surface of the plate-shaped elastic body rises, and no deformation occurs on the pavement material on the elastic body.

This slit is preferably provided in a waveform so as to meander in the direction perpendicular to the bridge axis. By doing so, the wheel load applied to the pavement material and the elastic body can be widely dispersed.

[0031]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an overall longitudinal sectional view in the bridge axis direction showing a pavement structure of a clearance section of a road bridge according to an embodiment, FIG. 2 is an enlarged view of a main part in FIG. 1, and FIG. 3 is II in FIG.
FIG. 4 is a sectional view taken along the line IV-IVa of FIG. 2, and FIG. 4 is a sectional view taken along the line IVa-IVa of FIG.

Bridges 30, 32 each having a slab provided on a girder are installed at the top end of the pier 29 via bearings 29A, 29B. A play section (hereinafter, sometimes simply referred to as a play section) 34 is interposed between the bridge bodies 30 and 32. A plate-like elastic body (hereinafter, sometimes referred to as an elastic plate) 36 is arranged on the bridges 30 and 32 so as to straddle the play 34, and a pavement material 38 is constructed on the elastic plate 36. A pavement 40 is constructed on the bridges 30 and 32 so as to be flush with the pavement 38.

The elastic plate 36 is mainly made of plate-like rubber, and a cord 42 is embedded in the rubber, and tension is applied to the cord 42. That is, the tension bars 4 are provided at both ends of the elastic plate 36 in the bridge axis direction.
4 and 44 are buried, and the cord 42 extends in the bridge axis direction (or in an oblique direction crossing the bridge axis) so as to be hung between the tension bars 44 and 44.

Anchor blocks 48, 48 are fixedly installed on the bridge bodies 30, 32 by anchor bolts 50 near the both ends of the elastic plate 36 in the bridge axis direction. Note that the anchor bolt 50 is screwed into a one-touch anchor 52 embedded in the bridge bodies 30 and 32.

The anchor block 48 is provided with a bolt insertion hole 54 (FIG. 2) penetrating in the bridge axis direction, and a tension bolt 56 is inserted into the bolt insertion hole 54. The rear end side of the tension bolt 56 is embedded in the elastic plate 36 and is screwed to the tension bar 44. The tip side of the tension bolt 56 passes through the bolt insertion hole 54, and a tension nut 58 is tightened. By tightening the tension nuts 58 sufficiently and pulling the tension bolts 56, the elastic plate 3
6 is pre-tensioned. By sufficiently pretensioning the elastic plate 36, even if the bridges 30, 32 are displaced in the direction in which the play 34 contracts, the elastic plate 3
Reference numeral 6 merely elastically reduces the deformation in the bridge axis direction, and does not cause any deformation such that the upper surface of the elastic plate 36 rises.

The lower surface of the elastic plate 36 has a play space 3
4, the load supporting plates 60A and 60B are installed so as to straddle
It is fixed to the bridge bodies 30 and 32 by anchor bolts 61.

The load support plate 60A has its base end fixed to the bridge 30 with anchor bolts 61 and its distal end slidably mounted on the upper surface of the bridge 32. The load support plate 60 </ b> B has its base end fixed to the bridge 32 with anchor bolts 61, and its distal end slidably loaded on the upper surface of the bridge 30. The distal ends of the load supporting plates 60A and 60B are comb-shaped, and the comb-shaped portions of the load supporting plate 60A and the comb-shaped portions of the load supporting plate 60B face each other with a slight gap therebetween. ing.

An elastic block 62 made of rubber or the like is arranged on an upper portion of the play space 34 and attached to the end surfaces of the bridges 30 and 32. The elastic block 62 supports the load supporting plate 60 and the elastic plate 36 from below.

On the upper surface of the elastic plate 36, a ridge and a ridge extending in the direction perpendicular to the bridge axis are provided.
6 and the elastic plate 36 are integrally displaced. The upper surface of the ridge of the elastic body 36 is adhered to the pavement material 38 by an adhesive 70.

A metal plate 74 is buried in the elastic plate 36 below the ridge, and a reinforcing bar 76 erected from the metal plate is raised up into the pavement 38. This strut 76
A spine 78 is fixed to the upper end of the base member by welding or the like. The spine 78 is embedded in the pavement 38. This spine 7
Reference numeral 8 extends in the bridge axis direction.

Since the ridges and the recesses are provided and the spine 78 is provided above the ridges, the elastic plate 36 and the pavement 38 are highly integrated near the ridges. . Also, since the back muscle 78 extends in the bridge axis direction, the elastic plate 3
When 6 expands and contracts in the bridge axis direction, the elastic plate 36 and the pavement material 38 hardly expand and contract near the back muscle 78, and expansion stress concentrates on the pavement material 38 above the concave streak.

A slit 64 extending in the direction perpendicular to the bridge axis is formed in the pavement material 38 above the concave portion of the elastic plate 36.
A soft elastic material 66 is provided in the slit 64.
Is filled. The slit 64 is provided so as to reach from the top surface to the bottom surface of the pavement material 38. A plurality of slits 64 are provided at predetermined intervals in the bridge axis direction.

Since the slit 64 is provided, when the elastic plate 36 is deformed so as to contract in the bridge axis direction, the pavement 38 is deformed so that the width of the slit 64 is reduced. Is reliably prevented from rising. Conversely, when the elastic plate 36 is deformed so as to extend in the direction of the bridge axis, the width of the slit 64 is increased, thereby preventing the pavement material 38 from being cracked. When the width of the slit 64 increases, the elastic material 66 inside the slit 64 is also stretched in the bridge axis direction, so that no gap is generated in the slit 64.

In this embodiment, as described above, the spine 78 is provided, and the upper surface of the ridge portion of the elastic plate 36 and the pavement material 38 are adhered to each other with the adhesive 70 so that the pavement material 38 The integration with the plate 36 is enhanced. In addition, the adhesive 70 is not provided on the upper surface of the concave streak portion, and the interface between the elastic plate 36 and the pavement material 38 allows the two to slide near this. Therefore, when the elastic plate 36 is deformed in the bridge axis direction, a sliding displacement occurs at the interface (the upper surface of the concave portion) near the slit 64 between the pavement material 38 and the elastic plate 36,
In addition to causing the slit 64 to expand and contract, the slit 64
Near the interface between the nearby paving material 38 and the elastic plate 36, almost no shear stress is generated in the direction along the interface.

The slit 64 may extend linearly only in the direction perpendicular to the bridge axis. In this embodiment, however, the slit 64 has a meandering waveform as shown in FIG. It is provided in. In FIG. 3 (a), the slit 64 has a rectangular wave shape in plan view including a bridge axis direction portion 64a and a bridge axis perpendicular direction portion 64b, but the trapezoid in FIG. 4 (a). The slits 64A and 64B may have a wave shape or a triangular wave shape shown in FIG. 4 (b) in a plan view. Of course, a slit having a curved shape such as a sine wave shape may be used as a planar view.
The slit can be easily formed by forming only the straight portion as shown in the figure. In FIGS. 3 and 4, the intersection between the straight portions is an acute angle, but the intersection and its vicinity may be curved and rounded.

In the pavement structure of the gap of the road bridge thus configured, as described above, the upper surface of the elastic plate 36 does not rise even if the gap 34 expands and contracts greatly in the bridge axis direction. Then, no deformation such as a crack or a swell occurs on the pavement material 38 above the elastic plate 36 at all.

By meandering the slit 64 as shown in FIGS. 3 and 4, the wheel load applied from the vehicle tire riding on the slit 64 is dispersed over a wide area of the pavement 38 near the slit 64. , Especially Yuma 3
4. The shear stress applied to the upper paving material 38 and the elastic plate 36 is reduced. However, the slit 64 may be provided in a straight line.

The method of repairing the paving material 38 will be described with reference to FIG.

When the upper surface of the pavement 38 becomes rough as shown in FIG. 5 (a), the upper surface of the pavement 38 is cut and removed over a predetermined depth as shown in FIG. 5 (b). At this time, the upper part of the elastic material 66 in the slit 64 is also removed.

Next, the elastic material 66 remaining in the slit 64 is extracted by a pickup or the like as shown in FIG.

The dummy material 80 made of a piece of wood, synthetic resin, or the like is inserted into the empty slit 64 as shown in FIG.

Next, as shown in FIG.
A new pavement material 38 _new is constructed on 8 _old , and both pavement materials are integrated.

Thereafter, as shown in FIG.
And the resulting slit 64 is filled with a new elastic material 66.
And finish the repair.

The pavement structure of the clearance section of the road bridge according to the present invention is only required to be configured as described above, and the constituent materials thereof are not particularly limited. An example of a suitable material will be described below.

As the paving materials 38 and 40, concrete,
Various asphalts (including modified asphalt) can be used.

As the elastic material to be filled in the slit 64, rubber, synthetic resin, various sealing materials and the like can be used.

As an adhesive for bonding the pavement material 38 and the elastic plate 36, vulcanized rubber such as CR, NBR, CSM, etc. can be used. In addition, rubber and resin (for example, EVA,
A blend composition with EEA) can also be used.

As the rubber of the elastic plate 36, NR, SBR,
BR, IR, CR, IIR, NBR and the like can be used.

As the cord 42, steel or synthetic fiber (for example, aramid) can be used. The cords 42 may be distributed in a direction parallel to the bridge axis direction, or may be provided in the bias direction as shown in FIG.

As the load supporting plate 60, a steel plate is preferable.

In the present invention, as shown in FIG. 9, a sliding layer 23 may be provided on the lower surface of the elastic plate 36. Such a sliding layer 23 may be made of TEF (1-tetrafluoroethylene), UHMW-PE (ultra high molecular weight polyethylene),
Examples include resin films or sheets of polyamide, polyolefin, polyester, and the like, plate-shaped special rubbers, and ceramic tiles.

Further, a recess 27 for drainage may be provided on the lower surface of the elastic plate 36 as shown in FIG.

[0063]

As described above, according to the pavement structure of the gap of the road bridge of the present invention, even if a large displacement of the gap occurs, cracks and swelling of the pavement material on the gap can be reliably prevented. Can be.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view in the bridge axis direction of a pavement structure in a play section of a road bridge according to an embodiment.

FIG. 2 is an enlarged view of a main part of FIG.

3A and 3B are cross-sectional views showing the structure of FIG. 1, wherein FIG. 3A is a cross-sectional view taken along line AA of FIG. 1B, and FIG. 3B is an enlarged view of the upper left half of FIG. FIG.

FIG. 4 is a horizontal sectional view showing a shape of a slit.

FIG. 5 is a sectional view showing a method for repairing a pavement material.

FIG. 6 is a sectional view of a clearance section of a road bridge according to the invention of the prior application;

FIG. 7 is a sectional view of the buried joint member of FIG. 6;

8 is an explanatory view of a bias cord of the buried joint member of FIG.

FIG. 9 is a sectional view of a buried joint member.

[Description of Signs] 30, 32 Bridge body 34 Play space 36 Elastic plate (plate-like elastic body) 38, 40 Pavement material 42 Cord 44 Tension bar 56 Tension bolt 60A, 60B Load support plate 64 Slit 66 Elastic material 74 Embedded iron plate 76 Strut 78 Back muscle 80 Dummy material

Claims (8)

[Claims] 1. A pavement structure of a clearance section of a road bridge paved so as to straddle a clearance section of a road bridge, a plate-like elastic body straddling the clearance section, and a pavement material formed on the elastic body. And a spine supported by the elastic body and embedded in the pavement material, wherein the pavement material has a plurality of slits extending in a direction crossing the bridge axis direction at intervals in the bridge axis direction. A pavement structure for a clearance section of a road bridge, wherein the slit is filled with an elastic material, and the spine is disposed at a position between the slits. 2. The pavement structure according to claim 1, wherein the spine extends in the bridge axis direction. 3. The method according to claim 1, wherein a metal plate is buried in the plate-like elastic body, a support bar is raised upward from the metal plate, and the back bar is connected to the support bar. The pavement structure at the play area of the road bridge. 4. The back muscle according to claim 1, wherein a plurality of ridges and recesses extending in a direction perpendicular to the bridge axis are provided on an upper surface of the plate-like elastic body. Is a pavement structure in a play area of a road bridge, wherein the pavement structure is disposed above the ridge. 5. The pavement structure according to claim 4, wherein the slit is provided in the pavement material above the concave streak. 6. The pavement structure according to claim 4, wherein an upper surface of the ridge portion of the elastic body and a pavement material are adhered by an adhesive. 7. The cord according to claim 1, wherein a cord extending in a direction including a bridge axis direction is embedded in the plate-shaped elastic body, and a pretension is applied to the cord. A pavement structure in a play area of a road bridge. 8. The pavement structure according to claim 1, wherein the slit extends in a wavy manner in a direction perpendicular to the bridge axis.