JP2005351060A - Concrete floor construction of detached base-isolated house - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a construction method in which a worker does not have to get into a clearance to perform removal work. <P>SOLUTION: When placing a concrete form 2 on a foundation 9 in constructing a concrete floor 1, posts 5 tapered toward the tips are erected on the foundation 9, placing the tapered tips on the top side, and sleepers 4 and joists 3 are placed thereon for erection. Before placing the concrete form 2 on the joists 3, the joists 3, the sleepers 4 and the posts 5 are tied with cords 10 or the like, and ends 10a of the cords are put outside from a partially cutout open part of a foundation peripheral cover 11. When the concrete floor 1 is horizontally moved by a jack 12 or the like after the completion of a building, the posts 5 incline, and the joists 3 and the sleepers 4 are displaced sideways and fall. The removal of the posts 5, joists 3 and sleepers 4 that have fallen on the foundation from under the floor is performed by pulling the cords 10a tied in construction. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention is applied to the floor portion of a detached base-isolated house, and the construction of the base-isolated house is facilitated by making the floor beam made of steel frame concrete, thereby reducing the cost of the base-isolated house. It is about.

The main method is to build a steel frame on the floor of a detached base-isolated house and build a house on it.
However, detached base-isolated houses are not uniform in size, and because they are combined with steel frames each time, mass productivity is not obtained and the price does not decrease.
A concrete floor can be easily constructed in the case of a building where a worker can have a space under the floor, such as a building seismic isolation. As a method for construction, concrete is poured by assembling struts, laying joists, plywood, etc. on it. To dismantle and remove the struts, it is possible to remove the struts one by one because the struts can be loosened and the struts can be lowered and removed. This method has been established as a conventional method. There is also a concrete flooring method for detached base-isolated houses. In that case, because the floor is as narrow as 500-600mm and workers cannot enter and work, the concrete floor is lifted with a jack or air bag after pouring concrete, and then the pillars are removed and dismantled I am doing.

  The present invention is a concrete floor construction method for a detached base-isolated house. When the floor is as narrow as 500 to 600 mm and an operator cannot enter and work, the concrete floor is raised using jack-up or air bag. This is a proposal for a construction method in which the operator does not have to go into the gap and remove it.

  Although the construction method for making the concrete floor is almost the same as the conventional method, in the present invention, in order to achieve the above object, a conical plate is installed on the lower surface side of the concrete floor on the ball bearing of the seismic isolation device. After assembling the struts around it, pulling over it and laying the joist on it, connect it with a string. Install the concrete formwork on the joists after attaching the string.

  After the concrete is placed, when the concrete has hardened and the required floor strength is obtained, use a jack or the like at the end of the concrete floor to remove the struts and joists on it. Push. The concrete floor is not loaded on the seismic isolation device at the time of construction, but the load is supported by the support, but when the concrete floor is pushed horizontally with a jack etc. and moves in the horizontal direction, a rotating ball placed on the foundation side Is operated in contact with a conical plate installed on the lower surface side of the concrete floor, whereby the concrete floor can be raised upward by the taper angle of the plate. Therefore, the concrete floor weight moves from the support column to the seismic isolation device, and the concrete floor weight does not rest on the support column, so that the support column can be easily removed. Moreover, since the jack load that pushes the concrete floor is the rolling friction due to the ball, it can be pushed with a small load.

  In this state, the pillar falls down because the joist moves horizontally and the pillar also tilts. By pulling on the end of the string attached to the draw, joist, or post, the fallen draw, joist, or post can be easily pulled out from under the floor. As in the prior art, the concrete floor can be jacked up and removed without the operator entering the floor.

  Currently, the steel beam method is the mainstream for receiving bases for detached base-isolated houses, but the cost is high. In the present invention, the steel base is made into a concrete structure with a low cost. However, the present invention has been devised to simplify the formwork which has been a drawback in the concrete structure construction. According to the present invention, it is possible to greatly reduce the trouble and labor of removing the joists and struts of the conventional method after construction, and it is possible to greatly reduce the cost of the seismic isolation housing base. Therefore, it can greatly contribute to the spread of detached base-isolated houses.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments that characterize the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram showing an embodiment according to the present invention. FIG. 2 is a view in which joists (3) and struts (5) fall down when the concrete floor is pushed from the outside.
Fig. 3 shows concrete floor (1) using jack (17), air bag (18), etc., when the floor is as narrow as 500-600mm and the worker can't work because it is a detached house. It is a figure of the conventional construction method which removes and dismantles a support column after raising.
In the case of a building such as a building where space for an operator to enter can be taken, such as a building, as a method of constructing a concrete floor, assembling the threaded column (19) and dismantling and removing the column, It is a figure of the conventional construction method which can loosen the screw currently processed by the support | pillar, can lower | lower a support | pillar, and can remove it.

  As can be seen in Fig. 3, when the floor is narrow, such as a detached house, workers cannot enter and work, so use a jack (17) or air bag (18) for the concrete floor after construction. After raising the concrete floor (1), the overdrawing (4), joists (3) and pillars (5) are removed and dismantled. This operation requires techniques for the placement and lift-up of the jack (17) or airbag (18). Although the concrete structure itself is inexpensive, it required man-hours to remove the construction equipment, and hindered cost reduction.

In the construction method of the seismic isolation device of the present invention, the base (9) side is provided with the seismic isolation device (8), the rotating ball (7), and the conical plate (6) on the concrete floor lower surface (1a) side. .
In assembling the column (5), the tip (5a) of the column (5) is slightly narrowed, and a large pull (4) and joists (3) are placed thereon. After laying the joist (3), draw the joist, joists and pillars with the string (10b), and the tip (10a) of the string goes out of the building. The concrete formwork (2) is attached on the joist after attaching the string (10). After placing the concrete formwork (2), the concrete is poured into the concrete floor (1).

  After the concrete is solidified and concrete strength is obtained, the foundation (13), the pillar (15), and the flooring (14) are constructed on the concrete floor (1). In the conventional steel frame method, it is difficult to cover the gap between the steel frames with a heat insulating material when floor heating is performed, but in the case of a concrete floor, the floor is hermetically sealed, so the flooring (14) and the concrete floor (1) By appropriately providing the space (16), it becomes easy to install a heat insulating material or the like of the floor heating equipment.

  After the construction of the building is completed, the concrete floor (1) can be moved horizontally with a jack etc. (12) from outside the building in order to make the seismic isolation device function and support the weight of the house. Set a device that can be used. When the concrete floor (1) is pushed horizontally with a jack or the like (12), the angle θ (6a) of the conical plate (6) attached to the lower surface (1a) of the concrete floor becomes a taper of about 4 degrees. Therefore, if the stroke when the concrete floor (1) is pushed horizontally with a jack or the like (12) is S, the amount X of the concrete floor (1) rising upward is X = tan θ × S and S = 200 mm. Then, X rises by about 15 mm. The removal of the formwork under the concrete floor can also be done at the beginning or during the construction period, which is not very heavy.

  As shown in FIG. 2, when the concrete floor (1) moves horizontally, the tip (5a) of the column (5) becomes thinner, so the column (5) moves against the movement of the concrete floor (1). The joist (3) and the large pull (4) can be moved without requiring a large load to be pushed by the jack (12). When the support (5), joist (3), and large pull (4) are tilted as it moves horizontally and the deformation becomes large, it falls on the foundation (9). If there is a gap between the concrete formwork (2) and joist (3), the house load is transferred to the seismic isolation device (8) and the rotating ball (7) rolls on the surface of the conical plate (6). The load which becomes friction and is pushed by the jack (12) can be smaller.

  Removal of the pillar (5) and joist (3) overdrawing (4) that fell on the foundation (9) from the bottom of the floor was done by opening a part of the building's foundation outer covering wall (11). By pulling the string (10a) that has been pulled out, it becomes possible to easily take out the construction equipment such as the columns (5) and joists (3) even from places where the gap under the floor is narrow. Further, even when the column (5), joist (3), and large pull (4) are difficult to fall, it is possible to pull down the string (10a) and take out these construction equipment from under the floor. If the jack (12) that pushed the concrete floor (1) is removed after the construction equipment is taken out, the seismic isolation device supports the concrete floor (1). As a function.

  It is the figure which showed one Example which concerns on this invention.   When the concrete floor of FIG. 1 is pushed from the outside of a building, a joist and a pillar will fall down.   If the floor is as narrow as 500-600mm, such as a detached house, and an operator cannot enter and work, the concrete floor is lifted using a jack or air bag, and then the columns are removed and disassembled. It is a figure of the conventional construction method.   In the case of a building that allows space for workers to enter under the floor, such as building seismic isolation, as a method of constructing a concrete floor, the column is processed into a column to assemble and dismantle the column. It is a figure of the conventional construction method which can loosen a screw, lower a support | pillar, and can remove.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Concrete floor 1a Concrete floor lower surface 2 Concrete formwork 3 joist 4 large pull 5 support 5a support tip part 6 conical plate 7 rotating ball 8 base isolation device 9 foundation 10 string 11 foundation outer periphery cover 12 jack (for horizontal)
13 foundation 14 flooring 15 pillar 16 space 17 jack (for ascending)
18 Back 19 Threaded support

Claims (3)

  A conical-shaped plate of a seismic isolation device is installed on the bottom side of the concrete floor, and the base side is a detached floor seismic isolation house with a rotating ball of the seismic isolation device, and stands on the foundation that supports the concrete floor Concrete floor construction method characterized by fixing struts, large draws and joists with straps   2. The concrete floor construction according to claim 1, wherein a moving device for moving the concrete floor and a building built on the concrete floor horizontally is attached between the end surface of the concrete floor and the ground to enable horizontal movement after the building is completed. Method   After the building is completed, it is moved horizontally, and the conical plate installed on the bottom side of the concrete floor is transferred to the rotating ball of the base-side seismic isolation device. However, the concrete floor construction method according to claim 1, wherein the struts and joists connected by the string can be removed by pulling the string and the function of the seismic isolation device can be exhibited.

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