JPH04182501A - Precast floor plate supporting method - Google Patents

Abstract

PURPOSE:To support upper load in the stable state by disposing spacers, formed by filling resin composed of a main agent and a curing agent mixed with each other into elastic containers deformable while maintaining approximately the same volume against load, on each girder, and placing floor plates thereon. CONSTITUTION:Spacers 5, formed of elastic containers 5a deformable while maintaining approximately the same volume or rubber balloons with resin 5b composed of a main agent and a curing agent mixed with each other or polyester-base resin used as resin filled therein, are disposed at appropriate spaces apart on the upper face of the flange 1a of each girder 1. Precast floor plates 2 with height adjusting bolts 3 protruded on the lower faces thereof to the extent of rough design height are placed thereon, and the installation height of the floor plates 2 is adjusted to be made into the reference height. After the hardening of the resin, the height adjusting bolts 3 are removed, and the floor plates are mutually tightened with PC steel. Space filling material or sealing material is further filled into bolt holes and gaps between the girders 1 and the floor plates 2. Defects such as the damage of flange parts can be thereby eliminated.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Field of Application) The present invention provides a method for supporting a FM beam structure slab, particularly when an existing floor slab is demolished and a precast floor slab is installed. Relating to a floor slab support method.

(Prior art) Conventionally, the method of demolishing an existing floor slab and installing a precast floor slab was to restrict traffic, demolish and remove the existing floor slab, clean the girder, and then install a precast floor slab. There is a known method of placing the

This method consists of 1. as shown in FIG. :Fold 1- Adjust the installation height of the precast floor slab 2' to the reference height using the height adjustment bolts 3- embedded in advance in the precast floor slab 2' placed above, Next, as shown in Fig. 6, a tapered plastic wedge 4' is driven between the precast floor slab 2' and the upper surface of the girder, and the height is 511 mm after the floor slab is supported. The bolts 3' are removed, and the bolt holes and the gaps between the precast slab 2' and the girder 1' are filled with filler material or sealing material.

(Problem to be Solved by the Invention) However, in this method, the load of the precast deck slab and the live load of passing vehicles, etc. are transmitted to the end of the 7 langes at the top of the girder at a point through the wedge, so the flange Part I%
Because the wedges are tapered, vibrations from passing vehicles can cause them to loosen, causing them to fall off. Also, although there are many wedges M1j, the load is received at points, so it is not necessarily uniform. 7i (It is difficult to receive.

If the fulcrum spacing becomes wide in such a situation, there is a risk that cracks will occur in the floor slab. In addition, the height between the top surface of the girder and the bottom surface of the precast slab is not necessarily constant, so sometimes multiple wedges are used, making it difficult to receive the load from the top in a stable manner at all times.

The present invention aims to eliminate such problems as described below.

(Structure of the Invention) (Means for Solving the Problems) In order to achieve the above object, in the method for supporting a precast deck slab of the present invention, elasticity that can be deformed while maintaining approximately the same volume under load is provided. After placing a spacer made of a container filled with a resin mixed with a base resin and a hardening agent at an appropriate gap on the girder, a precast floor slab with height adjustment bolts protruding from the bottom is placed on top of the spacer. The spacer is deformed by placing the spacer in place, and the load is transmitted to the girder.

Spacer B: The base material and curing agent are mixed in an elastic container that can be deformed while maintaining approximately the same volume under the load, and then the resin is sealed, so the girders and precast slabs are Under the load of the precast slab, it deforms into a flat shape while attempting to return to its original shape, and maintains its deformation as the resin hardens.

(Example> Next, embodiments of the present invention will be described based on the drawings.

FIG. 1 is a schematic perspective view showing an embodiment of the present invention, and FIGS. 2 to 4 are sectional views of main parts to show the construction process.
The figure is a cross-sectional view taken along line A-A in Figure 3, Figure 3 is a cross-sectional view taken along line B-B in Figure 2, and Figure 4 is a cross-sectional view taken along line C-C in Figure 3 showing the state in which the spacer has been deformed due to the load of the precast slab. It is a cross-sectional equivalent view.

First, in FIGS. 1 to 3, the flange 1a of technique 1
A container 5a made of an elastic material that can be deformed while maintaining approximately the same volume on the upper surface of the l! iI resin 5b, for example, a spacer 5 made of a polyester resin sealed therein is arranged at appropriate intervals, and a height: I
41! AE31 is made of a pre-drilled floor slab 2 with bolts 3 protruding from the lower surface to approximately the approximate design height. Here, the spacer 5 disposed on the flange 1a of the single digit 1 is disposed so as to avoid the height adjustment bolt 3 protruding from the lower surface of the precast floor slab 2.

Next, use the height adjustment bolts 3 to adjust the installation height of the precast floor slab 2 to 1! Adjust to the desired height. At this time, the spacer 5 is located between the girder 1 and the precast floor slab 2, and although it tries to return to its original shape under the pressure of the precast floor slab, it deforms into a flat state while maintaining approximately the same volume 111. , the deformation remains as the resin hardens. l!
! From the viewpoint of workability, it is preferable that the time required for the hardening of the fat is about 2 to 3 hours after the precast slab is finished II.

After the resin hardens, the height adjustment bolts 3 are removed, the precast slabs are tensioned with PCJI material as necessary, and the bolt holes and the gaps between the girder 1 and the precast slab 2 are filled with Ill as in the conventional construction method. Fill with material and sealing material.

[Effects of the Invention] Since the present invention is made as described above, it has the following effects.

The spacer is made of a container with elasticity that can be deformed while maintaining almost the same volume against the load, and is filled with a resin mixed with a main resin and a hardening agent. Although it tries to return to its original shape under the load, it deforms flat according to the gap, and maintains its deformation as the resin hardens.

Therefore, the load on the upper part is transmitted to the girder through the flat plate-like object, so the drawbacks of the conventional support method using wedges, such as damage to the cracked part of the girder, cracks in the deck slab, etc. Wedge removal can eliminate defects such as falling.

[Brief explanation of drawings]

Fig. 1 is a schematic perspective view showing an embodiment of the present invention, Figs. 2 to 4 are sectional views of main parts to show the construction process, Fig. 2 is a sectional view taken along line A-A in Fig. 3, Figure 3 is a cross-sectional view taken along line B-8 in Figure 2, Figure 4 is a cross-sectional view equivalent to line C-C in Figure 3 showing the state in which the spacer has been deformed due to the load of the precast slab, and Figures 5 and 6 are FIG. 2 is a sectional view of a main part explaining a conventional example. In the drawings, 1 is a girder, 2 is a precast floor slab, 3 is a height adjustment bolt, and 5 is a spacer. Patent applicant Shobond Construction Co., Ltd. Patent attorney
Haru Uno Senior disciple Figure 1 B Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] After placing spacers at appropriate intervals on the girders, which are made by filling a resin mixed with a base resin and hardening agent in an elastic container that can be deformed while maintaining almost the same volume under the load, A method for supporting a precast floor slab, comprising placing a precast floor slab with height adjustment bolts protruding from the bottom surface, and transmitting the load to the girder via the spacer.