JP2006118242A - Construction method of reinforced concrete floor slab of base-isolated structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a construction method of a reinforced concrete floor slab of base-isolated structure facilitating maintenance and inspection while increasing an economical effect required for construction by laying a vinyl sheet on the surface of foundation concrete to use it as a form, and integrating a base isolating material mounting frame with the reinforced concrete floor slab to eliminate difficult work in a narrow space under the floor and to carry out maintenance and inspection of a base isolating material without going under the floor. <P>SOLUTION: In this construction method of the reinforced concrete floor slab of base-isolated structure, the vinyl sheet 23 is laid on the surface of the foundation concrete 41 of a lower structure, and a base steel plate 32 is disposed in the installed position of the base isolating material 3. The base isolating material mounting frame 1 of steel construction is laid on the base steel plate, and the base isolating material mounting frame and the reinforced concrete floor slab 2 are integrated. After concrete is placed and hardened, the reinforced concrete floor slab is jacked up (51) for construction, using the base isolating material mounting frame and the base steel plate of the base isolating material as a lever. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for constructing a reinforced concrete floor with a small seismic isolation structure such as a wooden structure.

  Conventionally, for example, a seismic isolation rubber, which is a seismic isolation material, is erected on the surface of the foundation concrete, and a reinforcing bar concrete flooring is arranged on the upper surface side of the base isolation material. There is what was made to support a wooden building by (for example, refer patent document 1).

Japanese Patent Laid-Open No. 10-176435

  By the way, in the conventional technology described above, in order to construct a reinforced concrete floor slab on the upper surface side of the base-isolated material on the surface of the foundation concrete, usually a scaffold is made of wood on the surface of the foundation concrete. As the reinforced concrete flooring machine was constructed by assembling, laying the formwork on top of it, and building up the reinforced concrete flooring by assembling the rebar on this formwork and driving the concrete, To remove the formwork and scaffolding under the flooring, the work in the narrow space under the flooring is extremely difficult due to the heavy burden of the reinforced concrete flooring, which increases the cost. Yes. In addition, there is a problem that the floor height is inevitably high under the floor because humans also work under maintenance and inspection, which adversely affects the habitability of the superstructure housing.

  The present invention has been made in view of such problems of the prior art, and the object of the present invention is to place a vinyl sheet on the surface of the basic concrete and replace it with a formwork. By integrating the seismic isolation material mounting frame with the reinforced concrete floor slab, it is possible to eliminate difficult work in the narrow space under the floor, and the seismic isolation material can be maintained and checked without diving under the floor, The aim is to provide a construction method for seismic isolation reinforced concrete floors that can increase the economic effect of construction and are easy to maintain.

  In order to achieve the above object, the construction method of the seismic isolation structure reinforced concrete floor slab in the present invention is such that a vinyl sheet is laid on the surface of the foundation concrete of the lower structure and the seismic isolation material is installed. A base steel plate is placed, a steel frame seismic isolation material mounting frame is laid on the base steel plate, and the seismic isolation material mounting frame and the reinforced concrete flooring are integrated. It is characterized by building a reinforcing bar concrete flooring with jacking up a base plate for seismic isolation material and a base steel plate of seismic isolation material.

  Further, a part of the base concrete surface of the lower structure in the vicinity of the seismic isolation material facing the outdoors is cut down as a pit for maintenance inspection.

  In the method of constructing a seismic isolation structure reinforcing bar flooring according to the present invention, a vinyl sheet is laid on the surface of the basic concrete and this is used as a substitute for the formwork, and the frame for attaching the seismic isolation material is used as the reinforcing bar concrete. By integrating with the floor-building machine, it is possible to eliminate the difficult work in the narrow space under the floor, and the maintenance inspection can be performed without submerging the seismic isolation material under the floor, increasing the economic effect required for construction and maintenance. This is a method of constructing a reinforced concrete floor with seismic isolation structure that is easy to check.

  In addition, when a portion of the base concrete surface of the lower structure near the outside facing the seismic isolation material is cut down as a pit for maintenance inspection, the maintenance inspection of the seismic isolation material is further facilitated.

  1 to 3 are detailed views relating to a seismic isolation material mounting frame suitable for carrying out the present invention. In these drawings, reference numeral 1 denotes a steel frame seismic isolation material mounting frame. A fixed reinforcing bar 13 and a corner reinforcement steel plate 14 are welded to an outer peripheral frame 11, and two seismic isolation material receiving members are provided in the center. Each of the section steels 12 is attached to the outer peripheral frame 11 in a detachable state by the joining bolts 15. Reference numeral 16 denotes a bolt hole for a joining bolt of the push-up beam described later.

  FIG. 4 is a plan view of a reinforced concrete floor slab when four seismic isolation materials are deployed. The reinforced concrete floor slab 2 has reinforcing bars 22 arranged in a lattice pattern between the reinforcing bars 22. A concrete 21 is driven in, and seismic isolation material mounting frames 1 are arranged at the four corners of the reinforcing steel concrete flooring 2. The number of the seismic isolation material mounting frames 1 is not limited to four, and the number is increased as necessary depending on the size of the reinforcing bar concrete flooring 2.

  FIG. 5 to FIG. 8 are construction order diagrams for implementing the method of constructing the seismic isolation structure reinforced concrete floor slab of the present invention.

  In FIG. 5, reference numeral 4 denotes a basic structure, and the basic structure 4 is configured by disposing a discarded concrete 43 on the upper part of the split chestnut industry 42 and driving a basic concrete 41 on the upper part. The base concrete 41 is formed with a step portion for temporarily holding the seismic isolation material mounting frame 1. A base steel plate 32 is fixed to the upper surface within the step portion by a fixing bolt 33. Has been. A vinyl sheet 23 is installed on the surface of the foundation concrete 41 as a substitute for the form of the reinforcing bar concrete flooring 2.

  The seismic isolation material receiving steel 12 attached to the seismic isolation material mounting frame 1 is removed, and instead, the L-shaped steel 17 is used to temporarily fix the base isolation material mounting frame 1 to the base steel plate 32. The seismic isolation material mounting frame 1 is installed on the base structure 4 via the base steel plate 32 by the L-shaped steel 17 and the temporary fixing bolts 18. Reference numeral 24 denotes a mold on the maintenance inspection pit 45, 44 denotes a side mold, and 6 denotes a reference ground plane.

  Next, as shown in FIG. 6, the reinforcing bars 22 are assembled on the seismic isolation material mounting frame 1 and the like, and the concrete 21 is placed, so that the reinforcing bar concrete flooring 2 and the seismic isolation material mounting frame 1 are It becomes an integrated state.

  Next, as shown in FIG. 7, the reinforcing mechanism floor 5 is pushed up to a predetermined position by the push-up mechanism 5. Therefore, first, the bolt 18 for temporarily fixing the base-isolating material mounting frame 1 to the base steel plate 32 is pulled out, and the L-shaped steel 17 is removed from the base-isolating material mounting frame 1 so that the base-isolating material mounting frame 1 is removed. The hydraulic jack 51 of the push-up mechanism 5 is carried in from the upper opening portion of this, and the hydraulic jack 51 is fixed to the base steel plate 32. Then, the push-up beam 52 attached to the hydraulic jack 51 is attached to the seismic isolation material mounting frame 1 through the bolt holes 16 formed in the seismic isolation material mounting frame 1, and the push-up beam 52 is jacked up to reinforce the reinforcing bar. The concrete floor board 2 reaches a predetermined position.

  When the reinforced concrete floor slab 2 reaches a predetermined position, a sleeper 53 is placed under the frame of the seismic isolation material mounting frame 1 so that the reinforced concrete floor slab 2 floats in the air. To do.

  From the state of FIG. 7, the engagement of the lifting beam 52 of the lifting mechanism 5 and the seismic isolation material mounting frame 1 is released, the lifting mechanism 5 is taken out of the seismic isolation material mounting frame 1, and then the seismic isolation material mounting frame The seismic isolation material 3 is carried in from the upper opening of 1, and the seismic isolation material 3 is fixed to the base steel plate 32 by the seismic isolation material mounting bolts 34. Next, the seismic isolation material receiving steel 12 is attached to the seismic isolation material mounting frame 1, and the upper surface side of the seismic isolation material 3 is fixed to the seismic isolation material receiving steel 12 with the seismic isolation material mounting bolts 34. Next, the sleepers are removed and the seismic isolation material installation is completed as shown in FIG. In FIG. 8, reference numeral 31 denotes a seismic isolation device.

  As described above, the vinyl sheet 23 is laid on the surface of the foundation concrete 41, and this vinyl sheet 23 is used as a substitute for the form of the reinforcing bar concrete flooring machine 2, thereby providing the reinforcing bar concrete. The floor sheet 2 can be easily formed, and the vinyl sheet 23 can be easily peeled off from the reinforcing bar concrete floor board 2 after the concrete is hardened by placing the concrete. It is easy to push up 2.

  In addition, by using the seismic isolation material mounting frame 1, it is easy to construct the reinforcing steel concrete flooring 2 and to easily install and maintain the seismic isolation material 3.

  In addition, jacking up the reinforced concrete flooring machine 2 makes it possible to easily position the reinforced concrete flooring machine 2 at a predetermined position without using any scaffolding. , Its construction work can be done easily

  If the base concrete 41 of the lower structure is formed by cutting down a part of the vicinity of the seismic isolation material 3 facing the outdoors as a pit 45 for maintenance and inspection, use this pit 45. Thus, the maintenance and inspection of the seismic isolation material 3 can be further facilitated.

FIG. 1 is a plan view of a seismic isolation material mounting frame applied to a method for constructing a reinforced concrete floor slab having a seismic isolation structure according to the present invention. 2 is a cross-sectional view taken along the line AA in FIG. 3 is a cross-sectional view taken along the line BB in FIG. FIG. 4 is a plan view of a reinforced concrete floor slab applied to a method for constructing a reinforced concrete floor slab having a base isolation structure according to the present invention. FIG. 5 is a cross-sectional view at the time of installation of the seismic isolation material mounting frame in the construction order of the construction method according to the present invention. FIG. 6 is a cross-sectional view of the reinforcing bar concrete in FIG. FIG. 7 is a cross-sectional view of the reinforcing bar concrete floor raising operation in FIG. 8 is a cross-sectional view of the seismic isolation material in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Frame for seismic isolation material mounting 2 Reinforcement concrete floor slab 3 Seismic isolation material 5 Lifting mechanism 21 Concrete 23 Vinyl sheet 32 Base steel sheet 41 Base concrete 45 Maintenance inspection pit 51 Jack

Claims (2)

  This is a method of constructing a reinforced concrete floor slab installed between the seismic isolation layer and the upper structure. A vinyl sheet is laid on the surface of the foundation concrete in the lower structure, and the base isolation material is installed at the base position. A steel plate is placed on this base steel plate, and a steel frame seismic isolation material mounting frame is laid on the base steel plate, and the seismic isolation material mounting frame and the reinforced concrete flooring are integrated. Reinforced concrete with a seismic isolation structure, which is constructed by building up a reinforcing bar concrete flooring board using a base frame for seismic isolation material and a base steel plate of the seismic isolation material as a base after installation and hardening. How to build a flooring machine. 2. The seismic isolation structure of the seismic isolation structure according to claim 1, wherein a part of the base concrete surface of the lower structure near the outside facing the outdoor is cut down as a maintenance pit. How to build the floor.

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