JP7299088B2 - Floor slab replacement method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a construction method for replacing existing floor slabs provided on steel girders.

In structures where floor slabs are installed on steel girders, it is necessary to take measures to prevent the floor slabs placed on steel girders from shifting relative to the steel girders. A stud dowel protruding from the top surface is widely used. In other words, it is a method of joining steel girders and floor slabs via stud dowels, and various proposals have been made to make the joints stronger.

For example, Japanese Unexamined Patent Application Publication No. 2005-256430 discloses that two high-strength stud dowels with a short edge distance are provided with spiral reinforcements surrounding the high-strength stud dowels at their roots, and two spiral reinforcements and a plurality of high-strength stud dowels are arranged. A stud dowel unit consisting of a stud dowel is inserted into a stud dowel hole drilled at a position where no PC steel material exists in the precast PC floor slab. A structure has been proposed in which a PC floor slab is joined.

Japanese Patent Application Laid-Open No. 2005-256430

When the floor slab needs to be replaced due to deterioration over time or damage, the existing stud dowel must be cut from the steel girder and removed together with the floor slab in order to remove the existing floor slab. In addition, it is necessary to provide stud dowels for joining the newly installed floor slabs and steel girders to the upper surfaces of the steel girders at the construction site of the floor slabs.

However, in order to install the stud dowels, it was necessary to scrape the upper surface of the steel girder, and scraping could not be omitted, and it was a time-consuming task. is a constraint.

Therefore, the present invention shortens the construction period of floor slab replacement work including the step of installing stud dowels on site, and makes it possible to replace the floor slabs provided on steel girders in a shorter construction period. The purpose is to provide construction methods.

In the floor slab replacement construction method according to the present invention, the existing concrete floor slab is removed , and in a state where the existing stud dowel is not left on the upper surface of the steel girder, the stud is placed on the steel girder without scraping. A plate member having a through-hole into which a dowel is inserted is placed, and the surface on which the stud dowel is projected through the through-hole is cleaned.

According to the present invention, since the printing plate member having the through-holes into which the stud dowels are inserted is placed, and the surface on which the stud dowels are projected is cleaned through the through-holes, the range to be cleaned is minimized. can be kept. When the surface on which the stud dowel is projected is to be cleaned before the plate member is placed, the entire range of possible through-holes into which the stud dowel is inserted becomes the surface to be cleaned. It was necessary to clean up over In contrast, in the present invention, the range to be cleaned can be minimized, so the time required for the cleaning work can be shortened.

In addition, other work that cannot be done without placing the plate member can be performed simultaneously with the cleaning work. Therefore, compared with the conventional construction method in which the surface on which the stud dowel is projected is sharpened before the plate member is placed, the construction period required for installing the stud dowel is shortened, and the floor provided on the steel girder is improved. It is possible to replace the plate in a short construction period.

It is a perspective view which shows a schematic process of the floor slab replacement construction method which concerns on this invention. FIG. 4 is a perspective view showing a region to be scraped on the upper surface of the steel girder.

An embodiment of the floor slab replacement method according to the present invention will be described with reference to FIGS. 1 and 2. FIG. For the sake of easy understanding of the construction method, the relative relationship between the dimensions of the members and their portions shown in FIGS. 1 and 2 is not accurate.

The embodiment shown in FIGS. 1 and 2 is a construction method aimed at replacing an existing floor slab 2 that has deteriorated and is built on top of a steel girder 1 with a new floor slab. The existing floor slab 2 is constructed by forming a form on a pair of steel girders 1 and pouring concrete. It should be noted that FIG. 1(a) shows a state in which the pavement laid on the existing floor slab 2 in order to allow the vehicle to run has been removed.

When replacing the floor slab, first, the existing floor slab 2 is removed. At this time, the stud dowels joining the steel girder 1 and the existing floor slab 2 are cut off from the steel girder 1 and removed integrally with the existing floor slab 2 . Then, as shown in FIG. 1(b), the existing stud dowel is not left on the upper surface of the steel girder 1. Then, as shown in FIG.

After the removal of the existing floor slab 2 is completed, subsequently, as shown in FIG. A through hole 4 into which a stud dowel is inserted is previously formed in the plate member 3 . In this embodiment, it is assumed that a precast plate (PC plate) known as the plate member 3 is used. do it.

After the placement of the plate member 3 is completed, the surface of the steel girder 1 on which the stud dowel is projected is cleaned through the through hole 4 formed in the plate member 3 . At this time, the portions to be cleaned are a plurality of circular regions 5 corresponding to the openings of the through holes 4, as shown in FIG. In FIG. 2, the portion to be cleaned is shown by removing a part of the plate member 3, but the plate member 3 indicated by the broken line is actually placed.

On the other hand, when the surface of the steel girder 1 on which the stud dowel is projected is cleaned before the plate member 3 is arranged, the entire range where the through hole 4 may be arranged is indicated by an imaginary line in FIG. The rectangular area 6 shown is the object of keren. That is, since the object of keren covers a wide range, it takes more time than when the circular area 5 is targeted.

After the keren is completed, a stud dowel is placed in the through hole 4 and its base end is fixed to the steel girder 1. - 特許庁For fixing the stud dowels, an appropriate method should be adopted in consideration of the construction conditions and floor slab design. Then, mortar is injected into the through hole 4 from which the stud dowel protrudes, and the steel girder 1 and the plate member 3 are joined.

Further, each of the slab members 3 is connected by a joint structure (not shown) to form a floor slab. The work of installing the joints between each of the plate members 3 is performed in parallel with the cleaning. Therefore, compared to the case where the surface of the steel girder 1 on which the stud dowel is projected is cleaned before placing the plate member 3, the construction period of the floor slab replacement work including the step of installing the stud dowel on site is shortened. becomes possible.

1 Steel girder 2 Existing deck 3 Plate member 4 Through hole 5 Circular area 6 Rectangular area

Claims (1)

A through hole into which a stud dowel is inserted is formed on the steel girder without removing the existing floor slab and leaving the existing stud dowel on the upper surface of the steel girder without scraping. A method for replacing floor slabs, wherein a slab member is placed, and a surface from which the stud dowel is protruded is cut through the through-hole.

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