JPH0651961B2 - Bridge rebar concrete floor slab replacement method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial field of application" The present invention relates to a method for re-covering a bridge reinforced concrete floor slab that requires repair, and particularly suitable for a bridge reinforced concrete that is adopted in the center of a bridge that does not have a large shear force. It relates to the method of replacing the floor slab.

“Conventional technology” When it is considered that there is a danger of strength due to deterioration of the bridge reinforced concrete floor slab and cracks, it is necessary to replace the reinforced concrete floor slab.

Conventionally, when the need for re-covering has arisen in this way, as shown in FIG. 7, in a reinforced concrete floor slab d integrally fixed on the flange a ′ of the main girder a via a dowel b and provided with an asphalt c on the upper surface , As shown in FIG.
The reinforced concrete floor slab d is dismantled and removed by air gouging or a core breaker while leaving only the main girder a. At this time, since the upper part of the flange a'of the main girder a has a complicated structure by the dowel b and it is difficult to crush and remove only concrete, the dowel b is cut and removed. Subsequently, a new dowel b'is newly fixed on the flange a'of the main girder a in FIG. 8, and the concrete is placed by arranging a frame and assembling it as in the conventional construction of a reinforced concrete bridge. As a result, a new reinforced concrete floor slab d'is formed as shown in FIG. 9, and asphalt c'is installed on the upper surface thereof.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional method, dismantling of the reinforced concrete floor slab d requires a great deal of work, and especially dismantling of the upper part of the flange g of the main girder a is difficult. Takes a long time. Also, when constructing a new reinforced concrete floor slab d ′ after dismantling, there is a problem that a large amount of site work such as reinforcing bar arrangement, formwork installation, scaffolding construction, etc. takes place and the work takes time. Since it takes a long time to replace the reinforced concrete floor slab as described above, traffic is interrupted during that time, which is an important problem in recent traffic conditions.

The present invention has been made in view of these circumstances.

"Means for Solving Problems" The present invention is to remove a reinforced concrete floor slab that needs repairing along a flange width end of a main girder to leave a concrete block on the flange, and further to lengthen the concrete block. A joint space for a new floor slab is formed on the flange by partially cutting and removing a plurality of locations at appropriate intervals, and then the new floor slab is placed on the concrete block and the new floor is placed. The joining plate fixed to the plate is fitted into the joining space, and the joining plate and the flange are joined by bolts at the joining space position.

"Operation" Therefore, the site work can be remarkably reduced and the replacement work can be performed in a short time.

[Examples] Examples of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of a reinforced concrete bridge to which the present invention is applied and which requires repair. In the figure, 1 is a main girder and 1 '.
Is a flange, 2 is a reinforced concrete floor slab, 3 is a bell,
4 indicates asphalt.

In such a structure, when the reinforced concrete floor slab 2 is replaced, first, the reinforced concrete floor slab 2 is vertically cut along the longitudinal direction of the flange 1'of the main girder 1 and at both width end positions of the flange 1 '. And the like (cutting line 5), the reinforced concrete floor slab 2 is removed to leave the concrete block 6 on the flange 1 '(see FIG. 2), and more than one place in the longitudinal direction of the concrete block 6 is appropriately cut. Parting is cut with a certain interval (cutting line 7) and removed together with the dowels 3 to form a joining space 8 for a new floor slab. Then, the asphalt 4 on the concrete block 6 is removed. Note that FIG. 10 shows bolt holes formed in the flange 1'located in the joining space.

Subsequently, as shown in FIGS. 3 and 4, a new floor slab 9 made of a steel floor slab manufactured in advance in a factory or the like is placed on the concrete block 6 on the flange 1 '.
The new floor slab 9 is provided near the side surface of the concrete block 6 so as to regulate the widthwise position with respect to the concrete block 6, and the widthwise end plate 11 is fitted into the joining space 8 and extends in the longitudinal direction with respect to the concrete block 6. In order to regulate the position, a joining plate 12 fixedly provided at a lower required position between the width end steel plates 11 is provided, and further, a bolt hole 13 is formed in the joining plate 12 in correspondence with the bolt hole 10 of the flange 1 '. It is set up. still
16 is a U-trab for reinforcement. Therefore, when the new slab 9 is placed on the concrete block 6, the concrete plate 6 is held by the width-end steel plate 11 as shown in FIG. Is the joint space 8
The joint plate 12 is joined to the flange 1'by the high-tensile bolts 14 using the bolt holes 10 and 12 described above. Thereafter, asphalt 15 or the like is applied to the upper surface of the new floor slab 9.

In the above-mentioned embodiment, the reinforced concrete floor slab 2 requiring repair is cut and removed, and the upper portion of the flange 1'which is difficult to disassemble is partially removed and the other portion is left as the concrete block 6 as it is. Therefore, the removal work can be performed easily and in a short time. Furthermore, since the new floor slab 9 can be manufactured in advance in a factory or the like, it can be placed and fixed immediately after removing the reinforced concrete floor slab 2, thus significantly shortening the construction period of the entire re-covering work. be able to. Further, in a wide bridge in which a plurality of main girders 1 are installed side by side, even if the reinforced concrete floor slab 2 between some of the main girders 1 is replaced, the strength of the other parts is not lost. It can be used for transportation work or the like for passing or refilling a vehicle or the like.

The present invention is not limited to the above-mentioned embodiments, and the shape and structure of the new slab can be variously modified, and various modifications can be made without departing from the scope of the invention. Of course.

"Effects of the Invention" According to the above-described method for re-covering the bridge reinforced concrete floor slab of the present invention, the following excellent effects can be obtained.

(i) The replacement work can be performed quickly and in a short time, so that the occurrence of traffic obstacles associated with the replacement work can be minimized.

(ii) Since the reinforced concrete floor slab requiring repair is removed by cutting, shock noise pollution unlike the conventional case does not occur.

(iii) By making the new floor slab a steel floor slab, it is possible to easily improve the strength of the bridge.

(iv) Site work can be significantly reduced to reduce the construction cost.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial view of a bridge requiring repair according to the present invention,
FIG. 2 is an explanatory view showing a state where the reinforced concrete floor slab is cut and removed from the state of FIG. 1, and FIG. 3 is an explanatory view of the new floor slab,
FIG. 4 is an explanatory view of a state where the floor slab is re-covered by the construction method of the present invention, FIG. 5 is a view taken along the line VV of FIG. 4, and FIG. 6 is a view taken along the line VI-VI of FIG. FIG. 7 to FIG. 9 are explanatory views showing the conventional method for replacing the bridge reinforced concrete floor slab in a step-by-step manner. 1 is a main girder, 1'is a flange, 2 is a reinforced concrete floor slab, 3 is a dowel, 5 and 7 are cutting lines, 6 is a concrete block, 8 is a joint space, 9 is a new floor slab, 11 is a steel plate at the width end, 12 Is a joining plate, and 14 is a high tension bolt.

Claims (1)

[Claims] 1. A reinforced concrete floor slab requiring repair is cut and removed along the flange width end of the main girder to leave a concrete block on the flange, and a plurality of locations in the longitudinal direction of the concrete block are separated at appropriate intervals. To form a joint space for the new floor slab on the flange by partially cutting and removing the new floor slab, and then mounting the new floor slab on the concrete block and joining the new floor slab. A method for replacing a bridge reinforced concrete floor slab, wherein a plate is fitted into the joint space, and the joint plate and the flange are joined by bolts at the joint space position.