JPS6059210A - Replacing method of bridge reinforced concrete floor panel - 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 The present invention relates to a method for resurfacing reinforced concrete deck slabs of bridges that require repair.

In recent years, the reinforced concrete deck slabs of bridges have deteriorated further due to the increase in the number of vehicles, and it is expected that the reinforced concrete deck slabs at Mt. Otake will need to be replaced in the near future.

In the future, the calyx 1 of the roller 17 should be placed on the flange a' of the main girder a, as shown in Figure 1.
In the reinforced concrete 1 to floor slab d which are fixed together via the asphalt C and have asphalt C laid on the upper surface, first, after dismantling and removing the asphalt C and the reinforced concrete floor slab d by air gouging or a core breaker,
Similar to the construction of conventional reinforced concrete bridges, the structure was restored to the state shown in Figure 1 by arranging reinforcement, building forms, and pouring concrete.

However, in the conventional method described above, when replacing the reinforced concrete slab, the reinforced concrete slab is constructed again, which requires a large amount of on-site work such as reinforcing, installing formwork, and constructing scaffolding. "Increet t1
Flu It takes a very long ■- period due to its development and curing.

In this way, the long time it takes to replace the reinforced concrete 1/floor slab means that traffic is blocked during that time, which has become an important problem in light of recent traffic conditions.

For this reason, as mentioned above, after the reinforced concrete deck slab d is dismantled and removed, the steel deck slab e is fixed by welding f on the flange a' of the main girder a as shown in Fig. 2, or As shown in FIG. 3, it is considered that the steel deck slab e is fixed with poles [--Q, etc., so that it is directly connected to the main girder a, and the steel deck slab e is used for recladding.

However, for both types of J3'C, it is necessary to remove the existing dowel b (see Figure 1) on flange a', which obstructs the work, and to remove flange a' of main girder a and new steel deck slabs. It is difficult to precisely align and make on-site adjustments (in the case of welding, maintaining the groove accuracy, and in the case of bolts, there are problems with hole position misalignment and number of holes), and the above operations also cause problems with the construction time. The problem was that the period was extended.

The present invention has been made in view of these circumstances. During repair, the reinforced concrete slab is dismantled and removed while the existing dowel on the flange of the main girder remains intact, and then a rectangular or shaped space is created on the flange. A steel deck slab having connecting ribs forming the main girder is manufactured in advance in a factory, etc., and is placed on the flange. Then, concrete is poured into the rectangular space to integrate the main girder and the steel deck slab. The purpose of this is to make it easier and faster to reupholster.

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

1 in Figure 4 indicates the main girder, and the flange 1' of the main girder 1
The reinforced concrete slab was dismantled and removed, leaving the existing dowel 2 on top.

A steel deck slab 3 is placed on the flange 1' of the main girder 1. The steel deck slab 3 is located between the flanges 1 at the spacing positions of the main girder 1.
connecting ribs 4 positioned on both ends in the width direction of ';
5 attached to the lower surface, reinforcing ribs 7 attached at required intervals to the lower surface of the upper plate 6, and side dowels 8 attached to the inner surfaces of the connecting ribs 4 and 5. It is manufactured in advance at a factory or the like.

When placing the steel deck slab 3 on the main girder 1, a fifth
．． As shown in FIG. 6, the installation height of the steel deck 3 can be adjusted and the water-stopping effect can be achieved by arranging and placing a knot 9 made of an elastic material such as neoprene rubber. In order to supplement the waterproofing, if necessary, the backing section 9 may be applied with external force or caulking.

By placing the above-mentioned steel deck 3, the flange 1' and the connecting rib 4,
5 and a top plate 6.

Inside, a frontage 11 formed on the end side of the main girder 1 and on the top plate 6.
Pour early strength concrete 12 from the concrete 1.
By solidification of 12, the main girder 1 and adjustment method 1 return 3 are converted to dowels 2 and 8.
Unify through.

In addition, if a wide bridge is required, as shown in FIG. 7, the steel deck plates 3, 3 and 13 are closed and connected by welding or bonding.

As shown in t and s above, the existing dowel 2 is left as is and used for fixing the steel deck slab 3 (this makes the disassembly and removal work easier and makes effective use of the existing dowel 1 and old 1 dowel, In addition, the steel deck slab 3 can be manufactured in advance at a factory, etc., and since the main girder 1 is fixed to the flat plate 12 with concrete 12, a considerable amount of error can be avoided. Since the amount of asphalt can be absorbed by concrete and the amount of concrete to be placed is small, the on-site work can be reduced and the overall period of re-padding work can be significantly shortened.In addition, asphalt can be laid at factories, etc. It may be installed on the top plate 6 in advance, or it may be installed on site after the steel deck slab 3 is placed.

It should be noted that the present invention is not limited to the above embodiments, and that ultra-early strength concrete 1 or non-shrinkage concrete may be used as the concrete poured into the rectangular space, and that the structure of the steel deck It goes without saying that various changes may be made to the invention, and that various changes may be made without departing from the gist of the claimed invention.

According to the above-mentioned bridge reinforced concrete deck resurfacing method of the present invention, the following excellent effects can be achieved.

(+) Existing dowels on the main girder are left as is and used to secure the steel deck slab, making dismantling and removal work easier and making effective use of the existing structure.

(i) Since the existing main girder and the new steel deck are integrally connected via concrete, a considerable amount of error can be absorbed by the concrete, which eliminates the need for a high degree of connection accuracy. do not.

(b) Since the amount of concrete to be poured is small, the time required for pouring is short, and even if ultra-early strength concrete or non-shrinkage concrete is used, costs can be kept low.

(f) The above (+) (ii) (g) will make on-site work easier and simpler, and the overall construction period will be significantly shortened.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram for explaining a general example of the conventional re-covering method, Figs. 2 and 3 are explanatory diagrams showing an example of the conventional re-covering method using steel deck slabs, and Fig. 4 is a diagram of the present invention. 5 is a partially enlarged view of FIG. 4, FIG. 6 is a perspective view of FIG. 5, and FIG. 7 is an explanatory view of the case where the present invention is applied to a wide bridge. 1 is the main girder, 1' is the flange, 2 is the dowel, 3 is the steel deck,
4 and 5 are connecting ribs, 8 is a side dowel, 9 is a backing,
10 indicates a rectangular space, 11 indicates a frontage, and 12 indicates concrete. Patent application Hitoshi Kawajima Harima Heavy Industries Co., Ltd.

Claims (1)

[Claims] 1) The reinforced concrete 1/deck slab of the bridge that required repair was dismantled and removed with the dowels on the flanges of the main girders remaining, and then a connecting rib that could form a rectangular space was installed on the flanges. A bridge reinforced concrete deck resurfacing method comprising: placing a steel deck slab, and then pouring concrete into the rectangular space and solidifying it to integrate the single girder and the steel deck slab.