JPH0380210B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a method for fixing a precast concrete deck slab and a steel girder, which is used when replacing a damaged concrete deck slab of a steel girder bridge.

BACKGROUND ART Conventionally, a device described in Japanese Utility Model Application Publication No. 198310/1983 has been known as a device used in this type of fixing method. The device is generally constructed as shown in FIGS. 7 and 8. Figure 7 shows a cross section of an example of a steel girder bridge, where a is a precast concrete deck slab (hereinafter simply referred to as the deck slab), b is a steel girder, c is a bridge pier, and d
is a sidewalk.

When the new deck slab a is replaced with a new one, fixing the new deck slab a to the steel girder b is carried out approximately as shown in FIG. 8. That is, in the figure, bolt holes f are first drilled in the flange e of the steel girder b, and a formwork g made of angle iron is welded to the edge of the flange e. Then, a floor slab a is placed on this form g, and then mortar h is poured into the form g. Note that bolt holes l communicating with the recesses k are also formed in this floor slab a. Next, bolts m are provided passing through the bolt holes l, i, and f,
Secure with nut n. In addition, p is Patsukin, q
indicates a pipe.

Problems to be Solved by the Invention However, the above conventional method has the following difficulties. It is the bolt hole f in the flange e of the steel girder b.
It is troublesome because the angle iron g has to be welded. Moreover, these operations must be performed at multiple locations and over a considerable length of time, and it is difficult to perform these operations during times when there is no traffic, such as at night.

This invention was made in order to solve these problems, and its purpose is to eliminate the troublesome on-site work mentioned above, to make the floor slab replacement work extremely short, and to replace the conventional work. An object of the present invention is to provide an easier method of fixing a precast concrete deck slab and a steel girder.

Means for Solving the Problems This invention is described by providing a main insert and a sub-insert in advance in close proximity to a precast concrete slab, placing the precast concrete slab on a flange of a main girder, and inserting the main insert into the main girder. The height of the precast concrete slab from the flange is adjusted by the insert using a height adjustment bolt, and a vertical bolt with a holding fitting is screwed into the sub-insert, and the holding fitting is used to adjust the height of the precast concrete slab from the flange. A formwork is fixed at the end, mortar is poured into the formwork, and after the mortar has hardened, the height adjustment bolts and the formwork are removed, and the precast concrete is fixed with the vertical bolts using a holding fitting. This is a method of fixing a precast concrete floor slab and a steel girder, which is characterized by fixing the floor slab and a flange.

Function The main insert of the deck placed on the flange is
Screw the height adjustment bolts together and screw them forward to push or retreat the flange to adjust the height, thereby adjusting the floor slab to the same height as the existing floor slab. Next, a vertical bolt is screwed onto the secondary flange, a formwork is fixed to the flange using the holding metal fittings, and mortar is poured into the formwork. After this mortar hardens, remove the height adjustment bolt. Also, the formwork is removed and the flanges and floor slabs are fixed as described above.

Example In Fig. 1, 1 is a deck slab, 2 is a steel girder,
3 indicates the pavement, and 4 indicates the flange. Further, in FIG. 2, 5 is a main insert, and 6 is a sub insert. 7 is a height adjustment bolt, and 8 is a vertical bolt. A holding fitting 9 is provided on the vertical bolt 8, and the holding fitting 9 has a plurality of bolts 10 screwed into the base body 11 as shown in FIG. 5, thereby pressing the formwork 12 against the flange 4. It is supposed to be fixed. 13 is a spring, 14 is a washer, 1
5 indicates the bolt head. Further, the base body 11 has a holding portion 16. Next, in FIG. 3, reference numeral 17 indicates a hole in which the main insert is provided, and 18 indicates a hole in which the sub-insert 6 is provided.

Further, the presser metal fitting 9 may be formed as shown in FIG. 4. That is, there is no problem even if the spring 13 also serves as the presser part 16.

Next, as shown in FIG. 6, a support member 17 may be provided on the presser fitting 9. The support member 17 is, for example, a bolt provided on the base body 11, which allows the presser metal fitting 9 to be supported on both sides, further increasing stability. In the same figure, 19 is the existing floor slab, 2
0 indicates plywood, 21 indicates crosspieces, 22 indicates mortar, and 23 indicates concrete nails.

Note that the mortar 22 uses ultra-early strength cement, but is not limited to this, and may include early-strength cement,
Ordinary cement may also be used. Also the same mortar 2
In No. 2, non-shrinking mortar was used. Also, the formwork 1
2 is made of wood. The height adjustment bolt 7 is removed when the mortar 22 hardens and gains strength as described above. The springs 13 also prevent the vertical bolts 8 from loosening due to repeated loads applied to the floor slab 1. Note that the holes 17, 18, etc. formed in the floor slab 1 are filled with mortar or the like.

Effects of the Invention This invention is constructed as described above, and the main insert is formed in the deck slab, and the height adjustment bolt is used to adjust the deck slab to the height of the existing deck slab, making the work easy and quick. be able to. Further, unlike the conventional method, the formwork is not welded to the flange, but only needs to be temporarily fixed, so the work can be done easily and in a short time.

[Brief explanation of drawings]

Figures 1 to 3 show embodiments of the present invention, Figure 1 is a cross-sectional view of a steel girder bridge, Figure 2 is an enlarged detailed view of the portion shown in Figure 1, and Figure 3 is shown in Figure 1. 4 is a plan view of the girder bridge portion, FIG. 4 is a view corresponding to FIG. 2 showing the second embodiment of the invention, FIG. 5 is an enlarged plan sectional view of the portion shown in FIG. A diagram corresponding to FIG. 2 showing the third embodiment of the invention, FIG. 7 showing an example of a conventional similar method, a diagram corresponding to FIG. 1, and FIG. 8 showing enlarged details of the part in FIG. 1. It is a diagram. 1... Precast concrete floor slab, 2...
Steel girder, 4...Flange, 5...Main insert, 6
...Sub-insert, 7...Height adjustment bolt, 8...
...Vertical bolt, 9... Holding metal fitting, 12... Formwork,
22...Mortar.

Claims (1)

[Claims] 1. A main insert and a sub-insert are provided in advance in close proximity to the precast concrete slab, the precast concrete slab is placed on the flange of the main girder, and the main insert is used to insert the precast concrete using height adjustment bolts. Adjust the height of the floor slab from the flange, screw a vertical bolt with a holding fitting into the sub-insert, fix the formwork to the end of the flange with the holding fitting, and place it inside the formwork. Placing mortar and removing the height adjustment bolts and formwork after the mortar hardens;
A method for fixing a precast concrete deck slab and a steel girder, comprising fixing the precast concrete deck slab and a flange with the vertical bolts using a holding fitting.