JPS6055668B2 - How to reinforce existing RC slab - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for reinforcing slabs of existing RC buildings that are in an advanced state of deterioration.

As RC buildings age, various problems arise in terms of structure and design. For example, vibrations and deflections in the slabs make the rooms extremely inconvenient to use. This invention was developed in view of the above circumstances, and the existing R
In C buildings, vibration and deflection of the RC slab are attempted to be prevented by installing reinforcing shells such as H-shaped steel shells in contact with the lower surface of the RC slab formed between the RC shells. It is something. Hereinafter, the construction method of the present invention will be explained by way of an example illustrating the construction method. The sides of the existing RC beams 2, 2 to which the ends of the shaped steel beams 1, such as 1H-shaped steel beams, are attached are roughened by scraping with a glider, etc., and anchors, which will be described later, are placed thereon.

Center the bolt insertion hole. 2 Next, use a diamond drilling machine A or the like to form anchor bolt insertion holes 3, 3 in the centering portions of the existing RC rods 2, 2.

In this case, in order to prevent the diamond drilling machine A from cutting the reinforcing bars in the existing RC pipes 2, 2,
Exploring the location of reinforcing bars within. 3 Next, create an actual size pattern of the bracket 4 for attaching the shaped steel wire 1 to the existing RC wire 2,
Bracket 4 is manufactured based on this.

The bracket 4 includes a base plate 4a and a mounting plate 4 that projects approximately perpendicularly from the approximately central portion of the base plate 4a.
The base plate 4a and the mounting plate 4b have a plurality of bolt through holes 5, 5.
is formed. 4 Next, mounting seats 6, 6 are formed using resin mortar such as epoxy mortar at the mounting portions of the existing RC pipes 2, 2 where the shaped steel pipes 1 are to be mounted.

A slope is formed on the surface of the mounting seats 6, 6, which widens in the width direction as it hangs down. In addition, anchor bolt insertion holes 3, 3 are formed in the mounting seats 6, 6 and communicate with the anchor bolt insertion holes 3, 3. In addition, when forming the mounting seats 6, 6 as shown in FIG. 7a, the side surface of the existing RC wire 2 is ground to form a slope that spreads in the wire width direction as it hangs down from the side surface of the existing PC wire 2. If the mounting seats 6, 6 are used, construction can be simplified. 5 Next, anchor bolt insertion hole 3,
3 is filled with a resin mortar 7 such as epoxy mortar, and the resin mortar 7 is applied to the anchor bolts 8, 8, and the anchor bolts 8, 8 are inserted into the anchor bolt insertion holes 3, 3, and both ends thereof are The required length is made to protrude from the anchor bolt insertion holes 3, 3.

In this case, the other ends of the anchor bolt insertion holes 3, 3 are appropriately closed so that the resin mortar 7 in the anchor bolt insertion holes 3, 3 is not pushed out by the anchor bolts 8. 5 Next, the protruding parts of the anchor bolts 8, 8 are passed through the bolt through holes 5, 5 of the base plate 4a, and the fixing nuts 9, 9 are screwed onto the protruding parts of the anchor bolts 8, 8, so that the bracket 4, 4 to the mounting seats 6, 6.

Note that resin mortar such as epoxy mortar is applied to the surfaces of the mounting seat portion 6 and the base plate 4a in advance. 7. Next, when the resin mortar 7 hardens and develops sufficient strength, the end of the TA beam 1 is attached to the bracket 4, and the shaped steel beam 1 is placed across the existing 0RC beams 2, 2. The W4 beam 1 has its web 1a end attached to the mounting plate 4b of the bracket 4, and the web 1a end and the mounting plate 4b are connected to a bolt through hole 5 and a web 1a formed corresponding to the bolt through hole 5. It is attached to the bracket 4 by tightening bolts and nuts 13, 13 that continuously pass through the bolt through holes 5. When installing the shaped steel beam 1, if the lower surface of the existing RC slab 10 between the existing RC beams 2 and 2 is smooth, apply resin mortar to the upper surface of the upper flange 1b of the shaped steel beam 1, and attach the upper flange of the shaped steel beam 1. 1b is set so that it is adhered to the existing RC slab 10.

In this case, since the crimping j method is used, the shaped steel beam 1 is pushed up so that the upper flange 1b of the W4 beam 1 is crimped to the lower surface of the existing RC slab 10. In addition, when the lower surface of the existing RC slab 10 is uneven, as shown in Figure 3, the section steel beam 1 is
After setting between the C beams 2 and 62, both edges of the upper flange 1b of the shaped steel beam 1 are sealed by securing a resin mortar (hereinafter referred to as epoxy agent) injection port and an air vent at a predetermined position. Next, the gap 11 between the upper flange 1b of the shaped steel beam 1 and the existing RC slab 10 is filled with the epoxy agent 7 through the injection port.

In this case, a plurality of injection ports are formed in the longitudinal direction of the shaped steel beam 1, and the epoxy agent 7 is first injected from the injection port at the end, and continues until the resin mortar 7 is blown out from the next injection port. Next, the injection is performed from the injection port where the epoxy agent 7 was blown out, and the process is continued until the epoxy agent 7 is blown out from the next injection port. Thereafter, this operation is repeated to fill the entire gap 11 with the epoxy agent 7. Note that whether or not the epoxy agent 7 is completely filled in the gap 11 is confirmed by appropriately tapping the upper flange 1b of the W4 type beam 1 with a hammer or the like and listening to the sound of the tapping. Figure 1 shows an existing RC slab reinforced by the construction method of this invention.
The small beams 12 between the two are removed, and then a plurality of shaped steel beams 1 are removed.
is straddled.

The present invention has the above-described configuration, and can reinforce an existing slab in an extremely simple manner.

In addition, since the reinforcement beam end is supported by the shearing force of the bracket mounting bolts and the frictional force between the mounting seat and the bracket, the number of bracket mounting bolts can be reduced as much as possible, making it extremely economical. be. Moreover, the number of bolt insertion holes is small and construction is easy.

[Brief explanation of the drawing]

Figure 1 is a partial plan view of the existing RC slab, Figure 2 is the existing R
A sectional view showing the joint state of the C beam and the shaped steel beam, Figure 3 is a sectional view of the shaped steel beam, Figure 4, Figure 5, Figure 6, Figure 7, Figure 7 a1, Figure 8, FIG. 9 is a process diagram showing the construction order. 1...Shaped steel beam, 1a...Web, 1b
...Top flange, 2...Existing RC beam,
3... Anchor bolt insertion hole, 4...
Bracket, 4a... Base plate, 4b.
...Mounting plate, 5...Bolt through hole, 6...Mounting seat, 7...Resin mortar (epoxy agent), 8...・Anchor bolt, 9
...Fixed nut, 10...Existing RC slab, 11...Gap, 12...Small beam, 13...Bolt/nut .

Claims (1)

[Claims] 1. In a method for reinforcing an existing RC slab, a mounting seat part is provided that spreads in the width direction as it hangs down on the opposing surface of the existing RC beam extending in parallel, and a bracket is attached to this mounting seat part, and the existing RC slab is A method for reinforcing an existing RC slab, comprising: constructing a reinforcing beam between the beams in contact with the existing RC slab, and joining the end of the reinforcing beam to the bracket.