JP2001271497A - Temporary bearing construction method for existing building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the cost and shorten the term of works by dispensing with press-in of a steel pipe pile in the conventional construction method to temporarily bear the weight of a building for executing under-foundation base isolation work for the existing building even under the ground condition where there is boulder stone. SOLUTION: A pressure resisting board 8 which becomes a new foundation after the end of base isolation works is previously constructed outside the periphery of the existing foundation, and the weight of the building is temporarily born by a support 13 between an existing foundation beam 5 and the pressure resisting board 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for temporarily receiving the weight of a building at the time of construction accompanying the seismic isolation work of an existing building.

[0002]

[Prior Art] Conventional seismic isolation work (seismic isolation retrofitting work) to install seismic isolation devices under the foundation of an existing building
21 are performed according to the procedure shown in FIG.

In FIG. 15, 1 is a pillar of an existing building, 2 is a beam, 3 is a slab, 4 is a foundation footing, and 5 is a foundation beam. First, the existing slab 3 is removed, as shown in FIG. Excavation, leaving under the foundation.

[0004] Next, as shown in FIG.
The central beam is reinforced to give a reinforced foundation beam 6.
The temporary pile 7 is press-fitted below the foundation footing 4 as shown in FIG. Since the temporary pile 7 directly excavates and press-fits the soil under the footing, which is the foundation, it is necessary to first take a chemical solution into the soil under the footing to prevent collapse.

[0005] Then, as shown in FIG.
Excavating the entire area below, the end of the existing foundation beam 5 is reinforced to provide a reinforced foundation beam 6 ′, and as shown in FIG. Make settings.

[0006] As shown in FIG. 21, the first floor 10 is formed, the temporary pile 7 is removed or cut, and the load is transferred to the seismic isolation member 12.

As another conventional example, first, as shown in FIG. 22, the existing pit bottom 11 is removed, and as shown in FIG. 23, excavation is performed while leaving the bottom of the foundation footing 4, and as shown in FIG. 25, the temporary pile 7 is press-fitted below the reinforced foundation beam 6 as shown in FIG.

As shown in FIG. 26, the basic footing 4 is disassembled and removed, and as shown in FIG. As shown in FIG. 28, the temporary pile 7 is removed or cut and the load is transferred to the seismic isolation member 12.

As described above, in the conventional construction method, as a “temporary receiving” construction method for a building under construction, a temporary pile made of steel pipe piles is pressed into the ground from under the existing foundation footing or under the foundation beam immediately beside the existing foundation. Weight support methods have been adopted.

[0010]

However, in the case of a direct foundation, the press-fitting of the steel pipe pile into the lower surface of the foundation footing 4 is difficult in terms of construction, and the safety is hindered by breaking the supporting ground. In addition, in many cases, the stress as a pile foundation cannot be borne by the existing foundation footing 4 designed as a direct foundation (because the distribution load becomes a concentrated load → concentrated load), so the existing foundation footing 4 needs to be reinforced.

[0011] Even when the temporary pile 7 is press-fitted under the foundation beam, it is difficult to press-fit the steel pipe pile if there is a boulder or the like due to the geological condition, and even if it can be press-fitted, uncertainty remains in the bearing capacity.

In addition, it is difficult to press-fit the steel pipe pile directly below the existing beam, and when press-fitting the steel sheet pile on both sides of the beam, it takes twice as much time and labor.

An object of the present invention is to eliminate the disadvantages of the prior art and eliminate the press-fitting of steel pipe piles, thereby enabling temporary support for seismic isolation under a foundation even under the condition of a boulder or the like. It is an object of the present invention to provide a temporary receiving method for an existing building that can be expected to have a great effect on reduction and shortening of a construction period.

[0014]

According to the present invention, in order to achieve the above object, after the completion of the seismic isolation work, a new pressure-resistant panel, which is a new foundation, is constructed in advance of the existing foundation except for the surroundings, and the existing foundation beam and its pressure resistance are constructed. The purpose is to temporarily receive the building weight with the support (jack) between the panels.

According to the first aspect of the present invention, since the pressure plate is driven in advance, it is not necessary to press-fit the steel pipe pile under the footing or the foundation beam. In addition, since there is no press-fitting of the steel pipe pile, there is a great effect on cost and construction period. Furthermore, even under the ground condition where there is a boulder, etc., provisional support for seismic isolation under the foundation is possible. It is important to ensure structural safety in order to perform “construction while staying”, and it is possible to avoid the uncertainty of the supporting force due to boulders and the like and the danger of partially excavating under the footing.

[0016]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIGS. 1 to 7 are explanatory views of each step showing a first embodiment of a temporary receiving method for an existing building according to the present invention, and are the same as those shown in FIGS. 15 to 21 and FIGS. Are the same reference numerals, in the figure, 1 is a column of an existing building, 2 is a beam, 3 is a soil slab, 4 is a foundation footing, and 5 is a foundation beam.

First, as shown in FIG. 1, the existing earth slab 3 is removed, and as shown in FIG. 2, excavation is performed while leaving under the foundation.

Next, as shown in FIG. 3, the pressure-resistant plate 8 is firstly driven (constructed) except for around the existing foundation, that is, at a place other than below the foundation footing 4. This pressure-resistant panel 8 is a new foundation after the seismic isolation work is completed.
In addition, the existing foundation beams 5 are reinforced and reinforced.
And

As shown in FIG. 4, a support 13 by a jack is provided between the reinforced foundation beam 6 and the pressure plate 8 as described above.
Is installed, and the building weight is temporarily received via the foundation beam 6 reinforced with the support 13. Further, a restraining member 14 is disposed between the reinforced foundation beam 6 and the pressure plate 8 to temporarily fix a horizontal force.

Under the foundation is excavated as shown in FIG. 5 (secondary excavation), and as shown in FIG. Then, the seismic isolation member 12 such as laminated rubber is attached.

As shown in FIG. 7, the first floor 10 is constructed, the support 13 and the restraint member 14 are removed or cut off, and the load is transferred to the seismic isolation member 12.

FIGS. 8 to 14 show a second embodiment of the present invention. First, the existing pit bottom 11 is removed as shown in FIG. 8, and the bottom of the basic footing 4 is left as shown in FIG. Then, as shown in FIG. 10, the pressure plate 8 is driven (constructed) prior to excluding the area around the existing foundation, that is, at a place other than the foundation footing 4. In addition, the existing foundation beam 5 is reinforced to provide a reinforced foundation beam 6.

As shown in FIG. 11, a support 13 by a jack is provided between the foundation beam 6 thus reinforced and the pressure plate 8.
Is installed, and the building weight is temporarily received via the foundation beam 6 reinforced with the support 13. Further, a restraining member 14 is disposed between the reinforced foundation beam 6 and the pressure plate 8 to temporarily fix a horizontal force.

As shown in FIG. 12, the basic footing 4 is disassembled and removed, and as shown in FIG. 13, a pressure-resistant plate 8 'is cast at the place where the basic footing 4 is removed, and seismic isolation members such as laminated rubber are used. Install 12.

As shown in FIG. 14, the support 13 and the restraining member 14
And the load is transferred to the seismic isolation member 12.

[0026]

As described above, the temporary receiving method for an existing building according to the present invention eliminates press-fitting of steel pipe piles, thereby enabling temporary receiving for seismic isolation under a foundation even under the condition of a boulder or other ground. Further, a great effect can be expected for cost reduction and shortening of the construction period.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a first step showing a first embodiment of a temporary receiving method for an existing building according to the present invention.

FIG. 2 is an explanatory diagram of a second step showing the first embodiment of the temporary receiving method for an existing building of the present invention.

FIG. 3 is an explanatory view of a third step showing the first embodiment of the temporary receiving method for an existing building according to the present invention.

FIG. 4 is an explanatory diagram of a fourth step showing the first embodiment of the temporary receiving method for an existing building of the present invention.

FIG. 5 is an explanatory diagram of a fifth step showing the first embodiment of the temporary receiving method for an existing building of the present invention.

FIG. 6 is an explanatory view of a sixth step showing the first embodiment of the temporary receiving method for an existing building of the present invention.

FIG. 7 is an explanatory diagram of a seventh step showing the first embodiment of the temporary receiving method for an existing building of the present invention.

FIG. 8 is an explanatory diagram of a first step showing a second embodiment of the temporary receiving method for an existing building according to the present invention.

FIG. 9 is an explanatory diagram of a second step showing a second embodiment of the temporary receiving method for an existing building according to the present invention.

FIG. 10 is an explanatory view of a third step showing the second embodiment of the temporary receiving method for an existing building of the present invention.

FIG. 11 is an explanatory view of a fourth step showing the second embodiment of the temporary receiving method for an existing building of the present invention.

FIG. 12 is an explanatory diagram of a fifth step showing a second embodiment of the temporary receiving method for an existing building according to the present invention.

FIG. 13 is an explanatory diagram of a sixth step showing the second embodiment of the temporary receiving method for an existing building of the present invention.

FIG. 14 is an explanatory diagram of a seventh step showing the second embodiment of the temporary receiving method for an existing building of the present invention.

FIG. 15 is an explanatory diagram of a first step showing a first example of the related art.

FIG. 16 is an explanatory diagram of a second step showing the first conventional example.

FIG. 17 is an explanatory view of a third step showing the first conventional example.

FIG. 18 is an explanatory diagram of a fourth step showing the first conventional example.

FIG. 19 is an explanatory view of a fifth step showing the first example of the related art.

FIG. 20 is an explanatory diagram of a sixth step showing the first conventional example.

FIG. 21 is an explanatory view of a seventh step showing the first conventional example.

FIG. 22 is an explanatory diagram of a first step showing a second conventional example.

FIG. 23 is an explanatory diagram of a second step showing a second conventional example.

FIG. 24 is an explanatory view of a third step showing the second conventional example.

FIG. 25 is an explanatory view of a fourth step showing the second conventional example.

FIG. 26 is an explanatory diagram of a fifth step showing the second example of the related art.

FIG. 27 is an explanatory view of a sixth step showing the second conventional example.

FIG. 28 is an explanatory view of a seventh step showing the second conventional example.

FIG. 29 is a view taken along the line AA of FIG. 18;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Pillar 2 ... Beam 3 ... Soil slab 4 ... Foundation footing 5 ... Foundation beam 6, 6 '... Reinforced foundation beam 7 ... Temporary pile 8, 8' ... Pressure plate 10 ... 1st floor 11 ... Pit bottom 12 ... Exempt Earthquake member 13 ... Support 14 ... Restraining member

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Shinichi Kawamata 4-51 Otacho, Naka-ku, Yokohama-shi, Kanagawa Prefecture Kashima Construction Co., Ltd.Yokohama Branch (72) Inventor Takao Shinohara 4-chome Otacho, Naka-ku, Yokohama-shi, Kanagawa 51 Kashima Construction Co., Ltd. Yokohama Branch (72) Inventor Hiroyuki Oho 4-51 Otacho, Naka-ku, Yokohama-shi, Kanagawa Prefecture Kashima Construction Co., Ltd. Yokohama Branch F-term (reference) 2D046 DA12 2E176 AA00 BB28

Claims (1)

[Claims] (1) After completion of the seismic isolation work, a pressure plate to be a new foundation is constructed ahead of the existing foundation excluding the surrounding area, and the building weight is temporarily received by the support between the existing foundation beam and the pressure plate. The temporary construction method for existing buildings, characterized by