JPH0827703A - Formwork construction for track floating slab - Google Patents

Abstract

PURPOSE:To eliminate the arrangement work for spacers, facilitate reinforcement arrangement work in forms, improve workability, and also facilitate leveling. CONSTITUTION:Reinforcements are buried inside side walls and a bottom wall 1 of concrete. Also, using truss reinforcements 2 to which a reinforcement 5 bent in waveform is fixed by welding, etc. between two upper and lower linear reinforcements 3 and 4 as the reinforcements buried in the bottom wall 11, over half the truss reinforcements 2 is exposed to the bottom wall 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a track slab formwork structure for supporting rails provided with ballasts and sleepers at the top.

[0002]

2. Description of the Related Art When forming a floating slab for a track on site, a formwork of a predetermined size is made of plywood or the like, and a reinforcing bar 100 is arranged by using a spacer 101 as shown in FIG. Was. In addition, in order to save the construction of the floating slab and shorten the construction period, a semi-finished product of the floating slab that has a bottom wall and a side wall is made in the factory, and this is brought to the site and concrete is poured in the above method. The semi-finished product was also the formwork for the floating slab. When installing such a semi-finished product, that is, a formwork on the site, place a square timber on the roadbed, place the formwork horizontally on this square timber, and then place it on a flat bottom in the formwork. A spacer 101 for supporting the reinforcing bar 100 at a predetermined height is arranged, and the reinforcing bar 100 is arranged on the spacer 101, and then concrete is poured.

[0003]

On rigid roadbeds such as viaducts and tunnels, it is difficult to form concrete on site to form floating slabs and it is not possible to shorten the construction period. A semi-finished product (form) of the floating slab was produced at the factory, that is, precast by precast concrete, brought into the site, installed, and then concrete was placed in the form to complete the floating slab. When using such a formwork, it is necessary to make the bottom wall thickness of the formwork thicker in order to bear the load at the time of placing concrete and curing, and if it is thicker, the weight will increase and it will be transported to the site and installed. Work becomes difficult. In addition, when the formwork is supported by the square timber on the roadbed, the roadbed and the bottom wall of the formwork must be leveled without any clearance, and the work efficiency becomes poor. Further, the spacer 101 has to be used, and the work of disposing the spacer 101 has been troublesome.

In view of this, the present invention eliminates the work of arranging spacers, facilitates the work of arranging the reinforcing bars in the form, improves the workability, and makes the leveling of the track floating slab easy. The purpose is to provide a formwork structure.

[0005]

In order to achieve the above object, the present invention provides a concrete side wall and a bottom wall in a track floating slab formwork structure in which a ballast and sleepers are provided on the upper portion to support rails. Reinforcing bars are embedded inside the base and are straight as reinforcing bars embedded in the bottom wall.
The upper half of the truss bar is exposed from the bottom wall by using a truss bar in which corrugated rebars are fixed between the upper and lower rebars of a book by welding or the like. Further, a plurality of intermediate supporting works projecting vertically are provided on the bottom wall, and the portions of the intermediate supporting works projecting below the bottom wall are configured as supporting legs whose height can be adjusted.

[0006]

In the present invention, since the upper half of the truss is exposed from the bottom wall of the formwork, the formwork is carried into the site, and after the installation, the rebar is placed on the truss reinforcement, so that no spacer is required. Become. If reinforcement is installed on the truss reinforcement, concrete is placed. The bottom wall of the formwork is provided with a plurality of intermediate supports that project vertically, and the parts that project below the bottom wall of these intermediate supports are configured as support legs whose height can be adjusted. It bears the load and can easily level out.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, a reinforcing bar (truss reinforcing bar 2) embedded in the bottom wall 1 of the formwork 10 is shown.
A truss bar 2 having a reinforcing bar 5 bent in a wave shape between the upper and lower rebars 3 and 4 of the book is fixed by welding or the like, and the upper half of the truss bar 2 is exposed from the bottom wall 1. Further, the upper reinforcing bar 3 of the truss bar 2 is fixed on the site by means of welding or the like without using a spacer, and the reinforcing bar 6 buried at the time of placing concrete on the site.

FIG. 2 is a perspective view showing the whole of the formwork 10. The formwork 10 is composed of the bottom wall 1 and the side walls 11. The bottom wall 1 and the side walls 11 are prefabricated with precast concrete. Reinforcing bars are also buried inside the side wall 11, and the lower half of the truss bars 2 is buried in the bottom wall 1. The formwork 10 as shown in FIG. 2 is produced in a factory, and the formwork 10 produced in this factory is carried into the site and installed. After the formwork 10 is installed on the site, the reinforcing bars 6 are fixed to the truss reinforcement 2, concrete is placed in the formwork 10, and after curing, ballasts and sleepers are provided and rails are laid.

In FIG. 3, the bottom wall 1 is provided with a plurality of intermediate supporting members 7 projecting vertically, and the bottom wall 1 of these intermediate supporting members 7 is provided.
The portion projecting downward of the is formed into a support leg 8 whose height can be adjusted. The formwork 10 used here is shown in FIGS.
The formwork 10 is shown in FIG.
An anti-vibration rubber 9 is interposed between the bottom wall 1 of the mold 10 and the roadbed 12, which is supported on the base 2. A bolt is used as the support leg 8, a female screw portion (not shown) for receiving the bolt is embedded in the bottom wall 1, and the height of the formwork 10 from the roadbed 12 is adjusted by screwing the bolt 8 into the female screw portion. You can do it. The anti-vibration rubber 9 is installed by the support legs 8 to form the form 1
After adjusting 0 to a predetermined height, it is provided so as to fill the gap between the formwork 10 and the roadbed 12, and then the support legs 8 are retracted so that the formwork 10 is leveled and the antivibration rubber 9 Will be supported on the roadbed 12. Further, a padding of resin concrete or the like is applied to the uneven portion of the vibration-proof rubber 9, and after the padding is applied, the concrete is placed in the mold 10. By providing such an intermediate support structure 7, it is not necessary to increase the rigidity of the formwork 10.
The thickness of the bottom wall 1 of 0 can be reduced, and the weight of the mold 10 can be reduced.

FIG. 3 is a cross-sectional view of the whole, and the dotted line shows the reinforcing bars and the concrete that is placed after the formwork 10 is installed on site.

[0012]

As described above, according to the present invention, the reinforcing bars are embedded inside the concrete side wall and the bottom wall, and between the two straight upper and lower reinforcing bars as the reinforcing bars embedded in the bottom wall. Since the truss reinforcement with the reinforcing bar bent in a wavy shape fixed by welding etc. was used, and the upper half of this truss reinforcement was exposed from the bottom wall, if such a formwork was brought into the site and installed, it would be Other reinforcing bars can be easily fixed on the truss bars, eliminating the conventional troublesome work of arranging the spacers. Then, if other reinforcing bars are fixed on the truss bars, concrete can be placed in the formwork and cured to complete the track floating slab easily. In addition, if a plurality of intermediate supports that project vertically are provided on the bottom wall, and the parts that project below the bottom wall of these intermediate supports are configured as support legs whose height can be adjusted, leveling of the formwork can be easily performed. In addition to being able to do it, it becomes easy to install the formwork on site. Moreover, the rigidity of the formwork does not need to be increased by providing the intermediate support work, and therefore the bottom wall of the formwork can be made thin, and the formwork itself can be made lighter. If the weight of the formwork can be reduced, it can be easily carried in and installed on site.

[Brief description of drawings]

FIG. 1 is a sectional view showing a preferred embodiment of the present invention.

FIG. 2 is a perspective view showing a preferred embodiment of the present invention.

FIG. 3 is a side view showing a state where the formwork is installed on the site.

FIG. 4 is an overall sectional view.

FIG. 5 is a perspective view showing an arrangement example of a reinforcing bar using a conventional spacer.

[Explanation of symbols]

 1 Bottom wall 2 Truss muscle 7 Middle support 8 Support leg 10 Formwork

Claims (2)

[Claims] 1. A formwork structure of a floating slab for a track, in which a ballast and a sleeper are provided on an upper portion to support a rail. In a concrete side wall and a bottom wall, a reinforcing bar is embedded and a reinforcing bar embedded in the bottom wall. Floating slab for tracks, characterized in that the upper half of the truss reinforcement is exposed from the bottom wall by using a truss reinforcement in which corrugated reinforcement is fixed by welding etc. between two straight upper and lower reinforcements. Formwork structure. 2. The bottom wall is provided with a plurality of intermediate supports that project vertically, and the portions of the intermediate supports that project below the bottom wall are configured as support legs whose height can be adjusted. Formwork structure of the floating slab for tracks described in.