JP2007191961A - Reinforced structure of slab in existing building - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reinforced structure of a slab in the low priced and simple existing building. <P>SOLUTION: The reinforced structure 1 mounts a truss bar 3 on the lower face of the existing slab 2 with a fixed plate 4, the truss bar 3 is jointly formed of one upper end bar (top bar) 5 placed on the tip of a triangle and two lower end bars (bottom bar) 6 with a corrugated lattice bar 7, and the upper end bar 5 is mounted on the lower face of the slab 2 in a state to turn it to the lower side. Steel plates 8 and 9 as the fixed plate are welded and connected into the lower end bars 6 of the truss bar 3, the large steel plate 8 connected to both end sides and the lengthwise small steel plate 9 welded among these ones are mounted on the lower face of the slab 2 with an anchor bolt 10. These steel plates 8 and 9 can be adhered with, for example, a longer useable time type two component epoxy resin other than the anchor bolt 10, both of them can be used also for making adherence/connection, at the same time, the large steel plate 8 is connected with the anchor bolt 10, and the small steel plate 9 can be also adhered with an adhesive. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a slab reinforcing structure in an existing building.

A variety of slabs that have deteriorated due to aging, slabs with increased load capacity due to application changes, slabs with insufficient structural performance such as strength and rigidity, slabs with insufficient housing performance and required performance such as vibration and sound insulation Reinforced in the way. Examples of the reinforcing structure of a slab for an existing building include the inventions of Japanese Patent Publication No. 5-42553 and Japanese Patent Laid-Open No. 2002-30755. The invention of Japanese Patent Publication No. 5-42553 is directed upward to the slab by passing the reinforcing wire over the spacing member installed on the lower surface of the slab, and fixing both ends of the reinforcing wire to the beam and tensioning them with a predetermined force. The power of is given. The invention of Japanese Patent Laid-Open No. 2002-30755 is a configuration of a new slab with truss bars whose lower end bars are embedded in concrete.
Japanese Patent Publication No. 5-42553 JP 2002-30755 A

  However, in the invention of the above-mentioned Japanese Patent Publication No. 5-42553, the drilling work at the upper part of the beam and the end of the slab for installing the reinforcing wire is a difficult and complicated work. In addition, the invention of Japanese Patent Application Laid-Open No. 2002-30755 is not an existing slab reinforcement method but a configuration of a new slab.

  The present invention has been made in view of the above problems, and an object thereof is to provide a slab reinforcing structure in an existing building that is inexpensive and simple.

  The slab reinforcing structure in the existing building of the present invention for solving the problem is characterized in that truss bars with the upper end facing downward are attached to the lower surface of the slab by a plurality of fixing plates provided on the lower end bars. To do. In addition, the fixing plate is attached to the lower surface of the slab with an adhesive, an anchor bolt, or a combination thereof. In addition, the adhesive includes a two-pack type epoxy resin-based long-life type. Moreover, the fixing plate provided in the lower end bars is divided into the longitudinal direction or the width direction of the truss bars, and includes a plurality of fixing plates. In addition, it is included that at least the fixing plates on both ends are attached to the lower surface of the slab with anchor bolts. In addition, the size of the fixing plate can be adjusted according to the magnitude of the load applied to the bonding surface of the truss bar due to the tensile stress and the shear stress. It also includes cutting at least one lower end line between the fixed plates.

  The rigidity and load-bearing performance of existing slabs are improved, vibration disturbances are improved, the weight of the reinforcing material used for the reinforcement work can be reduced, and the reinforcement structure can be easily constructed. In addition, because of the truss bars, the strength and rigidity can be adjusted by the diameter of the upper bars, and it is possible to cope with partial reinforcement. In addition to reinforced concrete slabs, the present invention can also be applied to steel reinforced concrete slabs and steel slabs. In addition, since the existing part does not need to be lifted off, it does not affect the existing equipment piping and can be easily installed without the need for equipment such as a jack, so that low noise, low vibration and low dust can be achieved.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a slab reinforcing structure (hereinafter referred to as a reinforcing structure) in an existing building of the present invention will be described with reference to the drawings. In the embodiments, the same components are described with the same reference numerals, and only different components are described with different reference numerals. This reinforced slab has aged and flexed slabs, slabs with increased load capacity due to application changes, slabs with insufficient structural performance such as strength and rigidity, and dwelling and required performance such as vibration and sound insulation. It reinforces slabs.

  1 and 2 show a reinforcing structure 1 according to the first embodiment. The reinforcing structure 1 is configured by attaching a truss bar 3 to a lower surface of an existing slab 2 with a fixing plate 4. The truss muscle 3 is formed by joining one upper muscle (top muscle) 5 and two lower muscles (bottom muscles) 6 arranged at the apex of a triangle with a corrugated lattice muscle 7. It is attached to the lower surface of the slab 2 with 5 facing downward. Steel plates 8 and 9 which are fixing plates 4 are welded to the lower end reinforcement 6 of the truss reinforcement 3, and a large steel plate 8 joined to both ends and a vertically long steel plate 9 welded between them are anchored. The bolt 10 is attached to the lower surface of the slab 2. In addition to the anchor bolt 10 described above, these steel plates 8 and 9 can be bonded with, for example, a long-life two-pack type epoxy resin, or they can be bonded and bonded together. Furthermore, the larger steel plate 8 can be joined with the anchor bolt 10, and the other small steel plate 9 can also be adhere | attached with an adhesive agent.

  FIG. 3 shows a reinforcing structure 11 according to the second embodiment. The reinforcing structure 11 is a structure in which a large number of small steel plates 9 installed between the large steel plates 8 at both ends of the truss bars are provided in a horizontally long shape, and the rest of the structure is the same as the reinforcing structure 1 of the first embodiment. is there. By providing a large number of small steel plates 9 in this manner, the truss bars 3 can be easily attached to the lower surface of the slab 2 that is not necessarily horizontal.

  FIG. 4 shows a reinforcing structure 12 according to the third embodiment. In this reinforcing structure 12, the fixing plate 4 provided on the lower end reinforcement 6 is provided with a plurality of steel plates 9, that is, the steel plates 9 are provided on each of the two lower end reinforcements 6, and the rest is the same as in the first embodiment. The structure is the same as that of the reinforcing structure 1. Similarly to the above, the truss bar 3 can be easily attached to correspond to the lower surface of the slab 2 that is not necessarily horizontal. Further, by cutting at least one lower end stripe 6 between the fixed plates 4, the degree of freedom of each steel plate 9 is further increased, and each steel plate 9 can be easily brought into close contact with the unevenness of the lower surface of the slab. become able to.

  FIG. 5 shows a result of a static force experiment using a simple beam type for the reinforcing effect of the present invention on the existing slab 2. As shown in (1), the floor board 13 serving as a substitute for the slab 2 is thick. A concrete slab having a thickness of 120 mm, a width of 800 mm, and a span of 4000 mm, and a truss bar 14 having a height of 150 mm was fixed to the lower surface by pressure bonding. The evaluation of the reinforcement effect was performed by comparing the calculated value of the existing slab strength before reinforcement and the experimental value of the existing slab after reinforcement. As a result, as shown in (2) of the figure, it can be seen that there is an excellent reinforcing effect compared to the case without reinforcement, and the frequency of the slab after reinforcement is increased compared with the case without reinforcement. The effect could be confirmed.

  Further, the steel plates 8 and 9 in the reinforcing structure of the above embodiment can be changed in size according to the magnitude of the load on the adhesive surface of the truss bar due to the loading on the slab 2 after the truss bar is installed.

It is a reinforcement structure of a 1st embodiment, (1) is a sectional view, (2) is an expanded sectional view, and (3) is a longitudinal section. It is a bottom view of the reinforcement structure of a 1st embodiment. It is the reinforcement structure of 2nd Embodiment, (1) is sectional drawing, (2) is a bottom view. It is the reinforcement structure of 3rd Embodiment, (1) is sectional drawing of a vertical direction, (2) is a bottom view. (1) is a cross-sectional view of a concrete slab in a static force experiment, and (2) is a graph showing evaluation of a reinforcing effect.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 11, 12 Reinforcement structure 2 Slab 3, 14 Truss reinforcement 4 Fixing plate 5 Upper end reinforcement 6 Bottom reinforcement 7 Lattice reinforcement 8 Large steel plate 9 Small steel plate 10 Anchor bolt 13 Floor plate

Claims (7)

  A structure for reinforcing a slab in an existing building, characterized in that a truss bar with the upper end facing downward is attached to the lower surface of the slab by a fixing plate provided on the lower end bar.   The slab reinforcing structure for an existing building according to claim 1, wherein the fixing plate is attached by an adhesive, an anchor bolt, or a combination thereof.   The slab reinforcing structure for an existing building according to claim 2, wherein the adhesive is a two-pack type epoxy resin-based long working time type.   The reinforcement plate of the existing building according to any one of claims 1 to 3, wherein the fixing plate provided on the lower end bar is divided in the longitudinal direction or the width direction of the truss bar, and the fixing plate is constituted by a plurality of sheets. Construction.   The slab reinforcement structure in an existing building according to any one of claims 2 to 4, wherein at least the fixing plates on both ends are attached to the lower surface of the slab with anchor bolts.   The slab in an existing building according to any one of claims 2 to 5, wherein the size of the fixing plate can be adjusted according to the magnitude of the load applied to the bonding surface of the truss bar due to the tensile stress and the shear stress. Reinforcement structure.   The reinforcement structure of the slab in the existing building according to any one of claims 2 to 6, wherein at least one lower end reinforcement between the fixed plates is cut.

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