JPH0262643B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a road joint constructed at a joint portion of a road bridge.

(Prior Art) As for road joints, a blind area type is generally known in which joint paving is applied to bridge surface pavement to cover gaps between road joints. For example, on page 5 of the road bridge expansion/contraction device handbook published by the Japan Road Association, there is a description of a system in which waterproof joints are filled between gaps between opposing bridge bodies (slabs), and cutter joints are provided by paving on top of the waterproof joints. On page 70 of the same handbook, it is described that the above-mentioned play area is covered with a bridge board and paving is applied on top of it.

In the conventional blind ground type joint mentioned above,
In the former case, when the gap becomes wider due to expansion, contraction or flexure of the bridge body, the waterproof joints may fall under the bridge, causing the pavement to cave in or crack. In the latter case, the bridge plate may shift relative to the gap as the bridge body expands and contracts.
There is a concern that it may fall off from the play area, and to prevent this movement, it is possible to fix one side of the bridge bridge to one bridge body, but when the other bridge body flexes and its end moves up and down, Because the bridge plate is fixed to one bridge body, it cannot follow the vertical movement, and there is a risk of damage.

(Object of the Invention) In view of the above points, the present invention provides a blind type joint in which a bridge body plate spanning the above-mentioned gap is provided, so that the bridge plate does not shift significantly with respect to the gap as the bridge body expands and contracts. , which attempts to solve the above conventional problems.

(Structure of the Invention) In the road joint of the present invention, the bridge body and the bridge body or the abutment, which face each other across the gap at the road joint portion, are each formed with an inclined support surface that slopes downward toward the gap side, Both sides of the bridge bridge plate are slidably supported on both inclined support surfaces, and a joint paving is applied above the bridge plate in series with the bridge surface paving. In this case, as the bridge body expands and contracts, the bridge plate slides on the inclined support surface and moves up and down without significantly changing its position with respect to the gap.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

Example 1 This example is illustrated in FIG. In the road joint shown in the same figure, 1 is the bridge body (slab) 2, 2
This is a play space, and at the ends of both bridge bodies 2, 2 facing the play space 1, inclined support surfaces 3, 3 which are inclined downward toward the play space 1 are formed, respectively. Both sides of the bridge plate 4 spanning the gap 1 are slidably supported on both inclined support surfaces 3, 3, and on the bridge plate 4 there is a joint pavement 6 connected to the bridge surface pavements 5, 5. is applied.

Both of the inclined support surfaces 3, 3 are inclined at the same angle of inclination so as to be substantially symmetrical to each other with the play space 1 as the center. The bridge plate 4 is formed of a metal plate such as a steel plate or a copper plate, a synthetic resin plate, an FRP (fiber-reinforced plastic) plate, etc., and has downwardly inclined abutments corresponding to the above-mentioned inclined support surfaces 3 at both ends of the flat plate. Side 4
a, 4a are provided. In addition, the joint pavement 6 is
Lower layer 6a from the top surface of bridge board 4 to the height of bridge surface 7
and an upper layer 6b thereon. In this example, the upper and lower layers 6a, 6b are made of the same bituminous material mixture as the bridge pavement 5.

In the above-mentioned joint, when the gap 1 becomes narrower due to the elongation of the bridge body 2, the bridge plate 4 slides on the inclined support surfaces 3, 3 and rises, and conversely, when the bridge body 2 contracts, the bridge plate 4 is coming down. That is, the bridge plate 4 moves up and down in a horizontal state with its center substantially aligned with the center of the play space 1, and does not move significantly relative to the play space 1. In addition, the bridge board 4 is the play area 1.
Even if there is a temporary state of slight movement,
Under the influence of wheel loads, vibrations of the bridge body 2, etc., the bridge plate 4 is in a stable state in which it is in contact with the inclined support surfaces 3, 3 of the inclined contact surfaces 4a, 4b at both ends, that is, in the above-mentioned horizontal state. return.

In addition, in the case of this example, since the bridge board 4 is supported by the inclined support surfaces 3, 3 at both ends thereof, even if the inclined support surface 33 on one side moves up and down due to the deflection of the bridge body 2, the end of the bridge board 4 It does not float away from the inclined support surface 3, and the joint pavement 6 is less affected.

However, since the expansion and contraction of the bridge body 2 is allowed by the vertical movement of the entire joint pavement 6, the effect of this expansion and contraction is not only in the vicinity of both sides of the bridge plate 4, but also in the bridge plate 4. It will appear on the upper paving material, and the bridge surface pavement 5, 5 will also appear on the joint pavement 6.
It receives tensile force, etc. as it moves up and down. In other words,
The expansion and contraction described above is absorbed by the entire joint pavement 6 and the bridge surface pavements 5, 5 near both sides thereof, so that there is little local stress concentration and the occurrence of cracks is suppressed.

Example 2 A joint of this example is shown in FIG. 2, and is different from the joint of Example 1 in the structure of the bridge plate 8. That is, the bridge board 8 of this example consists of a central horizontal portion 8a and sloped portions 8b, 8b that are connected to both ends of the horizontal portion 8a and rise obliquely upward and outward. The slope angle of the slope part 8b is the slope support surface 3 of the bridge body 2.
The inclined contact surface 8c on the lower surface of the inclined portion 8b is in contact with the inclined support surface 3.

In the case of this example, since the inclined contact surface 8c of the bridge plate 8 is wide, the stability of the bridge plate 8 is high, and the effect of preventing displacement with respect to the gap 1 is high. This bridge board 8 is Example 1
Although it is made of a hard plate similar to the bridge board 4,
As in the bridge board 9 shown in FIG. 3, a rubber plate 9b may be fixed to the lower surface of a hard plate 9a, and the lower surfaces of both sides of the rubber plate 9b may be formed into inclined contact surfaces 9c.

Example 3 The joint of this example is shown in FIG. That is, the bridge board 10 of this example is formed by molding a hard board into a V-shape to form inclined contact surfaces 10a, 10a, and furthermore, the joint pavement 6 and the bridge board 10 are connected to the upper surface of the bridge board 10. A coupling member 1 protruding upward
1 is provided.

In the case of this example, the contact surface of the bridge plate 10 against the inclined support surface 3 of the bridge body 2 can be widened, the stability of the bridge plate 10 is increased, and the joint pavement 6
are connected to the bridge board 10, and even if cracks occur, the paving material is prevented from peeling off and flying out from the bridge board 10.

Note that the bridge plates of this Example 3 and the previous Example 1 are made of two hard plates and a rubber plate, similar to those of Example 2.
It may also have a layered structure.

Embodiment 4 The joint of this example is shown in FIG. 5, and the bridge plate 12 has a two-layer V-shaped structure of a hard plate 12a and a rubber plate 1b, and the bridge body 2 supports the inclined contact surface 12c. , 2 are provided with elastic bodies 1 made of rubber, sponge, etc. that contact both end surfaces of the bridge board 12.
3 and 13 are provided.

In this example, when the clearance 1 becomes narrow, the bridge board 1
2, the elastic bodies 13, 13 are compressed, allowing relative movement between this bridge plate 12 and the bridge bodies 2, 2, and both elastic bodies 13, 13 are compressed by the bridge plate 12.
By applying substantially equal biasing forces from both sides, the bridge plate 12 is prevented from unexpectedly shifting, and the bridge plate 12 is positioned with respect to the clearance 1.

Example 5 The joint of this example is shown in FIG. 6, and is an example in which the relative movement between the bridge plate 14 and the bridge bodies 2, 2 is made smoother. That is, first, the bridge board 1
4 is a two-layer V-shaped structure consisting of a hard plate 14a and a rubber plate 14b, similar to that in Embodiment 4, and has an inclined contact surface 1.
4c is formed. End face reinforcing plates 16, 16 are fixed to the bridge bodies 2, 2 with anchors 15, and the upper surfaces of the end face reinforcing plates 16, 16 serve as inclined support surfaces 16a, 16a. Then, guide members 17, 17 are fixed to the end face reinforcing plates 16, 16 at positions corresponding to both ends of the bridge board 14,
The guide members 17, 17 and the inclined support surface 16a,
Guide grooves 18, 18 that are open toward the play space 1 side are formed between the guide grooves 16a and the guide grooves 16a.

In the case of this example, the bridge plate 14 has an inclined support surface 16a,
16a is guided by guide members 17, 17 relative to the bridge bodies 2, 2, and the end of the bridge plate 14 is moved on the inclined support surface 1 by the guide members 17, 17.
6a, 16a is suppressed, and the positioning of the bridge plate 14 with respect to the gap 1 becomes more reliable.

Embodiment 6 The joint of this example is shown in FIG. 7, with the upper surface of the bridge plate 19 being horizontal, and the inclined contact surface 19 on the lower surface being tapered (thin) from the center to both ends.
a, 19a, the cross-sectional shape of the bridge board 19 is changed to 2.
It is shaped like an equilateral triangle. The bridge board 19 is made of metal such as steel, concrete, hard rubber that can withstand wheel loads, or the like.

In each of the above embodiments, even if a sponge plate is interposed between the inclined contact surface of the bridge plate and the inclined support surface of the bridge body to smooth the relative movement between the bridge plate and the bridge body. good.

In addition to a steel bridge in which a concrete slab is provided on a steel girder, the bridge body may be a prestressed concrete girder bridge, a reinforced concrete girder bridge, or a steel deck bridge.

Further, the present invention can be applied to a road joint where one side is a bridge body and the other side is a bridge abutment, in the same manner as in each of the above embodiments.

In addition, the joint part is paved in two parts, upper and lower, as in the above embodiment.
In the case of a layer, the lower layer may be formed of sand or other filler in addition to bituminous material.

Further, in the above embodiment, the contact surface of the bridge plate with respect to the inclined support surface is inclined, but this contact surface does not necessarily need to be inclined, and it is sufficient as long as it is slidable with respect to the inclined support surface. .

Further, the corresponding two inclined support surfaces do not necessarily have to be constructed symmetrically, but may be asymmetrical as long as they are inclined so that the bridge plate can be guided up and down.

(Effects of the Invention) According to the present invention, since the bridge plate slides on the inclined support surface and moves up and down as the bridge body expands and contracts, it does not shift significantly with respect to the gap, and the bridge body Alternatively, it is possible to prevent the bridge from falling from the gap to the underside of the bridge even if it is not fixed to the abutment, and the entire joint pavement moves up and down to allow the bridge body to expand and contract, reducing local stress concentration. This also suppresses the occurrence of cracks.

[Brief explanation of drawings]

The drawings show embodiments of the invention, FIGS. 1 and 2.
4 to 7 are longitudinal cross-sectional views showing each joint of Examples 1 to 6, respectively, and FIG. 3 is a longitudinal cross-sectional view showing another example of the bridge board in Example 2. 1... Play space, 2... Bridge body, 3, 16a... Inclined support surface, 4, 8, 9, 10, 12, 14, 19...
...Bridge plate, 5...Bridge surface pavement, 6...Joint part pavement.

Claims (1)

[Claims] 1 Slanted support surfaces that slope downward toward the gap are formed on the bridge body and the bridge body or abutment that face each other across the gap at the road joint, and a bridge plate that spans the gap is formed on both inclined support surfaces. A road joint characterized in that both sides of the bridge are slidably supported, and a joint pavement is applied above the bridge deck so as to be continuous with the bridge surface pavement.