JPH0333843B2 - - 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) With regard to road joints, a blind ground type is generally known in which joint paving is applied continuously to bridge surface pavement to cover gaps between road joints. for example,
Page 5 of the road bridge expansion/contraction device handbook published by the Japan Road Association describes a system in which waterproof joints are filled between gaps in opposing bridge bodies (slabs), paving is applied on top, and cutter joints are provided. On page 70 of the handbook, it is described that the above-mentioned play area was covered with a bridge board and paved over it.

(Problem to be solved by the invention) In the conventional blind ground type joint described 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 body flexes under the load of passing vehicles, and the end facing the gap moves up and down, but one end of the bridge body moves up and down relative to the other end. When this happens, a gap is created between the bridge plate and the end of the bridge body that supports it, resulting in the problem that the pavement is lifted up from the end of the bridge body by the bridge plate and is damaged.

That is, a first object of the present invention is to solve the above-mentioned problem of pavement damage caused by lifting of bridge decks, and for this purpose, the first invention is provided. A second object is to further suppress cracks and bulges in the pavement due to expansion and contraction of the bridge body, and for this purpose, the second invention is provided.

(Means for Solving the Problem) The first invention solves the first problem by configuring a bridge structure that rotatably connects a plurality of bridge members to support pavement on a gap. It is something to do.

Specifically, in the first invention, a bridge structure spanning the gap is constructed between opposing bridge bodies or between a bridge body and an abutment with a gap at a road joint, and the structure of the bridge structure is It is a joint of a road with a paved top, and the bridge structure is connected in the bridge length direction so as to be relatively movable up and down with the ends of each bridge length direction overlapping each other vertically. It is characterized by being constructed of a plurality of bridge members.

Moreover, the second invention solves the second problem by connecting the adjacent bridge members so as to be relatively movable in the bridge length direction.

Specifically, in the second invention, a bridge structure spanning the gap is constructed between opposing bridge bodies or between a bridge body and an abutment with a gap in the road joint, and the structure of the bridge structure is The bridge structure is a joint of a road with a paved surface, and the bridge structure is relatively movable up and down via an elastic body with the ends of each bridge longitudinally overlapping each other vertically. Moreover, it is characterized in that it is constituted by three or more bridge members connected in the bridge length direction so as to be relatively movable in the bridge length direction.

(Function) In the first invention, even if the end of the bridge body facing the gap moves up and down relative to the end of the opposing bridge body or abutment, adjacent bridge members in the bridge length direction are Since the bridge structure can be rotated, only some of the bridge members are tilted, and the entire bridge structure is not tilted. In other words, there is no large gap between the bridge structure and the top surface of the bridge body or abutment.
Therefore, it is possible to avoid a situation where the pavement is largely lifted off the bridge body or abutment due to the bridge structure.

In addition, since adjacent bridge members partially overlap each other, the wheel load transmitted to the bridge member via the pavement is distributed from this bridge member to the adjacent bridge member via the overlap area, and some It is possible to avoid the concentration of load on the bridge members.

In the second invention, since the adjacent bridge members are connected via the elastic body, the elastic body deforms as the bridge body expands and contracts, so that the bridge members move relative to each other so that the entire length expands and contracts. However, tensile force and compressive force act on the pavement at the connecting portion of both bridge members. In the case of the second invention, since the bridge structure is made up of three or more bridge members connected in the bridge length direction, the parts receiving the above-mentioned tensile force and compressive force are distributed in two or more places, which increases the possibility of cracks and bulges in the pavement. becomes less likely to occur.

(Effects of the Invention) Therefore, according to the first invention, the bridge structures are connected in the bridge length direction so as to be relatively movable up and down with the ends of each bridge length direction vertically overlapping each other. Because it is constructed from multiple bridge members, even if the end of the bridge facing the gap moves up and down relative to the end of the opposing bridge body or abutment, the pavement will not rise significantly from the bridge body or abutment. It is possible to avoid a situation where the bridge structure is damaged due to friction, and it is also possible to improve the durability of the bridge structure by avoiding concentration of the wheel load on some bridge members.

Further, according to the second invention, the bridge structure can be relatively movable up and down in the bridge length direction with the ends thereof vertically overlapping each other through the elastic body. Since it is composed of three or more bridge members movably connected in the bridge length direction, the same effect as the first invention can be obtained, and the tensile force and compressive force of the pavement can be reduced by the expansion and contraction of the bridge body. By distributing the receiving parts to two or more locations on the bridge structure, it is possible to suppress the occurrence of cracks and bulges in this pavement, making it possible to maintain good vehicle running performance over a long period of time. .

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

In the road joint shown in FIG. 1, 1 is a gap between the bridge bodies 2, 2, and support surfaces 4, 4 are formed at the ends of the bridge bodies 2, 2, which are lower than the bridge surface 3.
A bridge structure 5 spanning the above-mentioned gap 1 is constructed on both support surfaces 4, 4, and a joint pavement 7 connected to the bridge surface pavement 6 is applied on the bridge structure 5.

The bridge structure 5 includes a plurality of bridge members 8 connected in the bridge length direction via elastic bodies 9 made of rubber, bituminous material, or the like. In this example, each bridge member 8 has U-shaped folded portions 8a, 8a formed at both ends in the bridge length direction. The bridge member 8 with the folded part 8a facing upward and the bridge member 8 with the folded part 8a facing downward are provided so that their folded parts 8a, 8a face each other and overlap. An elastic body 9 made of rubber or the like is interposed between the folded portions 8a, 8a. Furthermore, the elastic body 9 prevents the adjacent bridge members 8 from coming into contact with each other.

The joint pavement 7 is composed of an upper layer 7a and a lower layer 7b whose boundary is the height of the bridge surface 3. In this example, the upper layer 7a and the lower layer 7b are made of the same bituminous material mixture as the bridge surface pavement 6. It is formed of.

In the above-mentioned joint, in the bridge structure 5, the central bridge member 8 with the folded portion 8a facing upward is in a position spanning the gap, and the adjacent bridge members 8 move vertically relative to each other due to the deformation of the elastic body 9. It is now possible to move relative to the length of the bridge.

Therefore, when the end of the other bridge body 2 moves up and down with respect to the end of the other bridge body 2, the bridge member 8 that straddles the above-mentioned gap 1 is moved by the support surface of the end of both bridge bodies 2, 2. Although the bridge member 8 is tilted in accordance with the difference in height, each bridge member 8 on both sides thereof maintains a state along the support surface 4.

Further, since the bridge members 8 are connected to each other in an overlapping state, the wheel load is not concentrated on the center bridge member 8, but is also distributed to the left and right bridge members 8, 8. Damage to the central support member 8 due to wheel loads is prevented. and,
Due to the above overlap, each elastic body 9 is protected by the end of the bridge member.

Furthermore, when the bridge body 2 expands and contracts, for example, when the right bridge body 2 in FIG. 1 moves in the direction of arrow A due to contraction, the right end bridge member 8 follows the right bridge body 2. First, it moves in the direction of arrow A, and the elastic body 9 at the right end is compressed. At this time, the paved portion above the bridge member 8 at the right end receives a tensile force, but the elastic body 9
When the amount of compression exceeds a certain level, the second bridge member 8 from the right moves in the direction of arrow A, the pavement above the center bridge member 8 receives tensile force, and finally the leftmost bridge member 8 The upper pavement is subjected to tensile forces. Therefore, in the joint pavement 7, the portions that receive tensile force due to the shrinkage of the bridge body 2 are distributed over a plurality of locations on the bridge structure 5, and cracks are less likely to occur.

Furthermore, in this bridge structure 5, since the bridge members 8 are connected in an overlapping state, the effect that the movement of one bridge member 8 is reliably transmitted to the other bridge members 8 in sequence can be obtained. . In other words, even if the bridge members 8 are connected via rubber without overlapping, the above-mentioned motion can be transmitted, but at that time, the rubber is subjected to tensile force, so if the rubber is aged, the rubber will move away from the bridge member. Although there is a concern that the elastic body may peel off, the problem of such peeling of the elastic body does not occur much with the above-described overlapping connection.

In this embodiment, an elastic body 9 is interposed between each bridge member 8, but an air gap is inserted without interposing an elastic body.
Each bridge member may be connected with play (play) so as to be relatively movable in the bridge length direction and in an overlapping state. Furthermore, when the bridge body 2 moves in the opposite direction to the arrow A due to elongation, there is a concern that the joint pavement 7 may swell, but the parts of the joint pavement 7 that receive the compressive force are distributed at multiple locations, Since the amount of bulge due to compression of each part is reduced, this bulge is easily flattened by passing vehicles, and does not actually become large enough to affect the running performance of the vehicle.

In the case of the above embodiment, the bridge structure 5 includes two bridge members 8, 8 with the folded portions 8a facing downward.
A recess is formed between the two and on both sides thereof,
Since the paving material of the joint pavement 7 is interposed in this recess, the bridge structure 5 and the joint pavement 7 are bonded to each other by this recess, and peeling of the joint pavement is prevented.

Other examples of the bridge structure are shown in FIGS. 2 and 3. First, the bridge structure 1 shown in FIG.
0, a locking portion 11a formed by bending into an L-shape is formed at the end of each bridge member 11, and each bridge member 11 has its locking portion 11a facing each other,
They are connected with an elastic body 12 interposed therebetween.
Furthermore, in the bridge structure 13 shown in FIG.
Each bridge member 14 has a flat plate shape, and each bridge member 1
An elastic body 15 is interposed between the overlapping and vertically opposing end portions of 4.

In addition, in the joint of the above embodiment, the central bridge member is in contact with the support surfaces 4, 4 of both bridge bodies 2, 2 and straddles the gap, but the bridge structure is turned upside down and straddles the gap 1. It may be provided as follows.

Further, in the bridge structure, the number of bridge members to be connected can be adjusted depending on the span of the applied bridge, that is, the amount of expansion and contraction.

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.

In addition, as a bridge body, in addition to steel bridges with concrete slabs on steel girders, prestressed concrete girder bridges, reinforced concrete girder bridges,
A steel deck bridge may also be used.

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.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a longitudinal sectional view showing a road joint, and FIGS. 2 and 3 are longitudinal sectional views showing other embodiments of the bridge structure. 1... Yuma, 2... Bridge body, 5, 10, 13...
Bridge structure, 7... Joint pavement, 8, 11, 14
... Bridge member, 9, 12, 15 ... Elastic body.

Claims (1)

[Claims] 1. A bridge structure spanning the gap is constructed between opposing bridge bodies or between a bridge body and an abutment with a gap at a road joint, and pavement is placed on top of this bridge structure. The bridge structure includes a plurality of bridge structures connected in the bridge length direction so as to be relatively vertically movable with the ends of each bridge length direction vertically overlapping each other. A road joint characterized by being constructed of bridge members. 2 Road joints where a bridge structure spanning the gap is constructed between opposing bridge bodies or between a bridge body and an abutment with a gap at the road joint, and paved on top of this bridge structure. The bridge structure is configured such that the bridge structure is movable vertically and relatively movably in the bridge length direction via an elastic body with the ends of each bridge lengthwise overlapping each other vertically. A road joint characterized in that it is constituted by three or more bridge members connected in the longitudinal direction.