JPS61266702A - Road joint - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

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, page 5 of the Highway Bridge Expansion Equipment Handbook published by the Japan Road Association describes a system in which waterproof joints are filled between gaps between opposing deck slabs, paving is applied on top of the waterproof joints, and cutter joints are provided on top of the gaps.

In the case of a conventional blind ground type joint, when it is first constructed, it does not generate noise or vibration even when a vehicle passes by, and is in an ideal condition for vehicle driving.

However, irregular cracks tend to form in the pavement due to vertical movement of the edge of the slab due to expansion and contraction of the slab and flexure, and these cracks spread in the direction of the road width, causing the pavement in the cracked area to receive impact from passing vehicles. The road may chip or crumble, creating wide grooves along the entire width of the road.

(Object of the Invention) In view of the above, the present invention is to suppress the occurrence of cracks in the pavement at the joint in a blind ground type joint, and to prevent cracks from occurring in the entire road width direction even if cracks occur. The purpose is to prevent cracks from spreading, that is, to prevent cracks from growing by making them discontinuous in the direction of the road.

(Structure of the Invention) In the present invention, a plurality of pavement protections are provided on the joint pavement covering the gap between the road joints, from the pavement section supported by one bridge body to the pavement section supported by the other bridge body or abutment. The members are provided at intervals in the road width direction. in this case,
The pavement protection member integrates with both pavement parts to connect the two pavement parts, and also prevents local cracks from spreading in the road width direction.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

An embodiment/example joint is shown in FIGS. 1 and 2. In this joint, 1 is a gap between the bridge bodies (slabs) 2, 2, and a pair of joint members 3, 3 are placed above the gap 1.
is provided. The joint members 3, 6 are provided with vertical substrates 4.degree. 4 facing each other with a gap therebetween, and protruding portions 5, 5 protruding toward the play space 1 at the lower ends of the vertical substrates 4, 4. An anchor 6 protrudes from the back of the vertical substrate 4, and this anchor 6
is the concrete part 8 cast in the notch 7 at the end of the bridge body 2
It is buried in The end surface of the protrusion 5 has a waveform as shown in FIG.

A back-up material 9 made of rubber, foam, etc. is provided between the joint members 3 and 6 and supported by the protrusion 5.5, and a paving material filling section 10 filled with paving material is placed on top of this bank-up material 9. Or is provided. Further, above the notches 7, 7 of the bridge bodies 2, 2, a bridge surface tightening device 1.11 and a joint paving device 2 connected (integrated) with the paving material filling portion 10 are provided. A plurality of pavement protection members 16 are buried in this joint paving device 2 at intervals in the road width direction.

The pavement protection member 13 of this example is a plate-shaped body that extends perpendicularly to the plate surface in the bridge length direction, and has a base 1 on one bridge body 2 side.
3a is connected to the anchor 6 via support bars 14.14, and extends from this base 13a to the other bridge body 2 side through a crossing portion t3b that goes beyond the joint members 6, 3. In other words, this pavement protection member 13 extends from the pavement section 12a supported by one bridge body 2 to the pavement section 12a supported by the other bridge body 2.
2b and extends beyond the boundary between both paved portions 12a and 12b. In addition, the upper end of the pavement protection member 16 is horizontal on the play area side so as to be approximately aligned with the road surface, and slopes downward from this horizontal portion to the rear.
The upper front edge of the frame is rounded.

Then, as shown in FIG. 2, between the crossing parts 13b and 13b of the pavement protection member 13°16, which has the base 13a on one bridge body 2, it is placed on the other bridge body 2. Base 13
The crossing portion 13b of the pavement protection member 13 provided with the mark a is made to face.

In the joint of this embodiment, stress due to expansion and contraction of the bridge body 2 is concentrated at the boundary between both paved sections 12a and 12b of the joint paving unit 2, but
b connects both the paved portions 12a and 12b and suppresses the occurrence of cracks.

Further, when a crack occurs at the boundary, the crack is prevented from reaching the road surface by the crossing portion 13b, and the adjacent crossing portions 13b, 1
Even if a crack occurs between the road surfaces 3b and 3b, the crossing portion 13b prevents this crack from spreading in the road width direction.

The reason why the rear upper end of the pavement protection member 16 is sloped downward is as follows.
This takes into consideration the wear of the pavement, and even if the pavement protection member 13 slightly protrudes above the road surface due to wear, the vehicle's tires ride on the pavement protection member 13 from the sloped portion, and the vehicle does not receive a large impact.

In addition, the paving material filling portion 10 between the joint members 3.3 functions to lock the joint paving device 2 to the bridge body side, preventing the joint paving device 2 from shifting or peeling, and preventing cracks. Cracks can be suppressed by increasing the thickness of the pavement in areas where cracks are likely to occur.

A joint of one embodiment is shown in FIGS. 3 and 3.

In the case of this example, a thick joint paving device 5 is provided between the notches 7, 7 of the bridge bodies 2, 2, and this joint paving device 5 is connected to the bridge surface tightening device 1 from one bridge surface tightening device 1 to the other bridge surface tightening device 1. Pavement protection member 1 leading to device 1
There are 6. Further, the play space 1 is closed by passing a bridge plate (lid) 17 across both cut portions 7, 7.

The pavement protection member 16 has a plate shape similar to the first embodiment, and the upper end of the center part is horizontal and approximately coincides with the road surface, the both sides are sloped downward in opposite directions, and the lower end of the center part is horizontal and approximately coincides with the road surface. It is lowered than the bridge surface 18 and is supported via support reinforcements 19b to connecting reinforcements 19a that connect the bridge body 2 and the joint paving device 5.

At the joint, as the bridge bodies 2 expand and contract, the bridge plate 17 fixed to one bridge body 2 moves relatively over the notch 7 of the other bridge body 2. With regard to the joint pavement position 5, the pavement located on the bridge plate 17 is supported via the bridge plate 17 with respect to the bridge body 2 to which the bridge plate 17 is fixed,
The joint paving unit 5 is the movable end of the bridge plate 17 (the right end in Figure 3)
Pavement part 1 supported by one bridge body 2 with the position as the boundary part
5 and the pavement section 15b supported by the other bridge body 2 are arranged in series. In this way, the pavement protection member 16 is provided straddling both of the above-mentioned covering parts 15a and 15b.

In the case of this embodiment, the pavement protection member 16 joins the above-mentioned two parts 15a and 15b to prevent slippage and strengthen the entire pavement, as in the embodiment, and also prevents cracks from spreading in the road width direction. However, since both ends are embedded in the bridge pavement 1.11, the effect is even greater. Furthermore, since the joint paving layer 5 is formed to have a thick layer, cracks are less likely to occur.

In the above embodiment, the pavement protection members are either extended in the bridge length direction or, as shown in FIG. You may.

Further, in the above embodiment, the upper end of the pavement protection member is aligned with the road surface, but the upper end may be made slightly lower in consideration of pavement wear.

The bridge body may be a steel bridge in which a concrete slab is provided on a steel girder, a prestressed concrete girder bridge, a reinforced concrete girder bridge, or an I-slab bridge.

Further, the present invention can be applied to a road joint portion where one side is a bridge body and the other side is a bridge abutment, with a structure similar to that of the above embodiment.

(Effects of the Invention) According to the present invention, the pavement portion supported by one bridge body and the pavement portion supported by the other bridge body or abutment are connected by the pavement protection member, so that the pavement can be strengthened. In addition to suppressing the occurrence of cracks, the pavement protection member prevents cracks from spreading in the road width direction even if cracks occur locally, maintaining good vehicle running performance over a long period of time. can.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a cross-sectional view of a joint according to the embodiment taken in the bridge length direction, FIG. 2 is a plan view of the joint on the same side before paving, and FIG. 3 and 3 are similar views to FIGS. 1 and 2 relating to the second embodiment, and FIG. 5 is a plan view showing an example of the arrangement of pavement protection members. 1... Play space, 2... Bridge body, 11...
...Bridge surface pavement, 12, 15, 20...Joint section pavement, 12a, 12b. 15a, 15b=----pavement part, 13,
16, 21... Pavement protection member 3rd session 4th session

Claims (1)

[Claims] (1) In roads where joint pavement covering gaps at road joints is connected to bridge pavement, the joint pavement is supported from the pavement supported by one bridge body to the other bridge body or abutment. A road joint characterized in that a plurality of pavement protection members extending over a paved portion are provided at intervals in a road width direction.