JPS6059209A - 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] This article concerns a method for relining REIT floor slabs.

If the reinforced concrete deck slab of a bridge is aging and cracks appear, which poses a risk to its strength, it is necessary to replace the reinforced concrete deck slab.

Conventionally, when the need for such resurfacing arose, reinforced concrete slabs were fixed integrally onto the flange a' of the main girder a via dowels b, as shown in Figure 1, and had asphalt C laid on both sides. At step d, as shown in FIG. 2, the reinforced concrete slab d is dismantled and removed using air gouging or a core breaker, leaving only the main girder a. This pz, the upper part of flange a' of main girder a is Pi. Since it has a 9J-long structure and it is difficult to crush and remove only the concrete, the concrete is cut and removed together with the dowel b.

Next, dowel b' is newly fixed on flange a' of main girder a in Fig. 2, and concrete is placed by arranging reinforcement, building formwork, and pouring concrete in the same manner as in the construction of conventional reinforced concrete bridges. New reinforced concrete floor slab d
' is formed, and asphalt C' is laid on the top surface.

However, in the above conventional method, it takes a lot of effort to dismantle the reinforced concrete deck slab d, and especially the flange a of the main girder a.
It is difficult to dismantle the '-L section, and the disassembly work takes a long time. Furthermore, when constructing a new reinforced concrete floor slab d' by 1PJ after demolition, a large amount of on-site work such as reinforcement, installation of formwork, and construction of scaffolding is required, resulting in the problem of time-consuming work. The fact that it takes 114 hours to replace the reinforced concrete slab in this way means that traffic is cut off during that time, which has become an important problem in light of recent traffic conditions. There was also the problem of noise pollution caused by noise generated during demolition work as described in 1111.

The present invention has been made in view of the above circumstances, and by cutting and lifting a reinforced concrete slab that requires repair at an appropriate inner position from the width direction end of the flange of the main girder, the two parts of the flange shown in 11. Remove the flange, leaving only the flange, and then place it on the widthwise end of the flange made of steel or synthetic material that has been constructed in advance at a factory, etc. in the width direction, and fix it with welding or bolts. According to
The purpose is to carry out construction work in a short period of time without causing noise.

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

Figure 4.5 shows -('A) of a reinforced concrete bridge that required repair to which the present invention was applied. ,
3 indicates dowel and 4 indicates asphalt.

In the two-part structure, when re-cladding the reinforced concrete slab 2, a recess (for example, 10 to 20 ann) must be made along the longitudinal direction of the flange 1' of the main girder 1 and from both width ends of the flange f. The reinforced concrete floor slab 2 is vertically cut 5 at the inside position of the tower using a tire cutter or the like. At the same time, as shown in FIG. 5, even between the main girders 1 and 1 installed parallel to each other, the reinforced concrete slab 2 is made large enough to be lifted and transported in the direction perpendicular to the 9 cut line 5. At the same time as cutting 6, it is lifted up using hanging pieces 7 etc. that have been attached to the reinforced concrete floor slab 2 in advance and removed. At this time, the cut 5 along the flange 1' described in ff1I does not need to be cut exactly to the flange 1', and as shown in FIG.
Even if one uncut part is left on the soil surface, 1) I
The suspended soil described in I shall be removed by removing the reinforced concrete slab 2 by operation, leaving the concrete block 8 on the flange 1' (the asphalt on the concrete block 8 will be removed), as shown in Figure 6. I can do it.

Next, as shown in Fig. 7, a new method plate 9 consisting of a steel plate or a synthetic plate previously manufactured in a factory, etc. is 1)
16 on the IJ flange 1'.

New law 1iH9 is OjJ Koshi concrete block 8
An end face steel plate 10 which is located close to the width end of the flange 1 and an upper face steel plate 11 which is located at the same time as the upper face of the concrete block 8 by 1η. have. The lower end of the end steel plate 10 in the above new law version 9 is fixed to the flange 1 with welding 12, and the upper steel plate 11 and 11 described in II are fixed together by welding, and then 1ai1iit 1face steel plate 11. 2. Lay asphalt 14 etc. on the flange 1' of section 2. Figure 8 shows another example of the new legal system for the new floor slab indicated by n'+1. It is fixed with bolts 15 via a flange 10' provided on the steel plate 10. In this case, it is necessary to secure a space for bolt fixing at the widthwise end of the flange 1 by cutting the reinforced concrete slab 2 further inside the cutting line 5 shown in FIG. 4.

In addition, in the above, if it is necessary to bond the concrete block 8 and the new law version 9, adhesive may be poured into holes (not shown) made in the end steel plate 10 and the top steel plate 11 to solidify them together. I can do it. Furthermore, the asphalt 14 described in No. 111 may be laid at a factory, leaving only the welded joint 13 of the upper steel plate 11, and then that part may be laid after the welding work is completed, or the asphalt 14 may be laid entirely on-site. J: You can do it by hand.

In the above embodiment, the reinforced concrete slab 2 that requires repair is cut and removed, and the earthen part of the flange 1, which would be difficult to disassemble, is left as it is as a concrete block 8, so that the removal work is not necessary. It can be done easily and in a short time, and does not generate any noise. In addition, since the new law version 9 can be manufactured in advance at a factory etc., 1) II Reinforced Concrete 1.
After the floor slab 2 is removed, it can be placed and fixed immediately, so that the overall period of re-laying work can be significantly shortened. In addition, in a wide bridge where multiple main girders 1 are installed side by side, even if the reinforced concrete slab 2 between some main girders 1 and 1 is replaced by 3M, the strength of other parts will not be impaired. Therefore, it can be used for transportation work such as passing vehicles or performing reupholstery work.

It should be noted that the present invention is not limited to the above-described embodiments, and it goes without saying that the shape and structure of the new law version can be changed in various ways, and that various changes can be made within the scope of the gist of the invention. It is.

” According to the method for re-covering reinforced concrete decks of bridges according to the present invention, the following excellent effects can be achieved.

(1) The re-upholstery work can be carried out quickly and in a short time, thereby minimizing traffic disturbances caused by the re-upholstering work.

(ii) Since the reinforced concrete floor slabs that require repair are removed by cutting, there is no need to cause the destructive noise pollution that occurs in the past.

Qii) By using steel deck slabs or synthetic deck slabs as the new law slabs, it is possible to easily improve the strength of bridges.

6ψ By significantly reducing on-site work]: Costs can be reduced.

[Brief explanation of the drawing]

Figures 1 to 3 are explanatory diagrams showing the conventional bridge reinforced concrete deck resurfacing method step by step, Figure 4 is a partially cutaway IE view of a bridge that requires repair to which the present invention is applied, and Figure 5 is Fig. 4 is a plan view seen from the direction ■, Fig. 6 is an explanatory diagram showing the state in which the reinforced concrete floor slab is cut and removed in the method of the present invention, and Fig. 7 is the reinforced concrete floor slab in Fig. 6 in the method of the present invention. FIG. 8 is an explanatory diagram showing a state in which the new law plate is placed and fixed on the flange of the girder from which the new law plate has been removed. FIG. 8 is an explanatory diagram showing another example of the method of fixing the new law plate. 1 is a) Migir, 1' is a flange, 2 is a reinforced concrete slab, 3 is a dowel, 5 and 6 are cutting lines, 8 is a concrete block, 9 is a new law version, IO is an end steel plate, 11 is a top steel plate, 12. 1 indicates welding, and 15 indicates bolts. #1 Revised application person Ishikawa A Harima Heavy Industries Co., Ltd. '11, X'r++11171 agent #, l';
Figure 3 Figure 7

Claims (1)

[Claims] 1] After cutting and removing the reinforced concrete slab that requires repair along the flange of the main girder at an appropriate position inside the widthwise end of the flange, the new slab that had been previously formed was placed on the ml flange. A method for resurfacing reinforced concrete deck slabs of G-beams, which is characterized by placing them on the ends in the width direction and fixing them by welding or bolts.