JP3407168B2 - Foundation of new building using existing pile foundation - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foundation of a new building which is used without removing an existing pile foundation of an old building when rebuilding the building. 2. Description of the Related Art As shown in FIG. 6, when a building is renovated due to aging of the building or functional deterioration due to social development, etc.
In the case where the existing building 1 has an underground and is supported by a pile 3 placed in the ground 2, the existing pile foundation 4 should be removed or buried at the same time as the demolition of the existing building 1. Was common. As shown in FIG. 7, one example of the removal of the existing pile 3 is drawing out by using a vibro hammer 5, and for burying, after cutting and removing the upper part of the pile, the remaining pile is removed. The method of burying is used. [0003] In this conventional method, it takes a long time to remove the existing pile foundation and the pile, so that the construction period is long, and the cost is increased due to the removal cost.
As a solution to this problem, a new pillar is placed at the four corners of the building without removing the existing pile foundation, leaving it as it is, and without considering the existing pile, a construction method that is completely independent of the existing pillar and foundation However, in this method, since the building above the ground is built on a civil engineering scale base, there is a problem that becomes one of the constraints on the function of the building. On the other hand, since the supporting piles of the old building are designed according to the old standards, no consideration has been given to the horizontal resistance to the piles, and it is considered impossible for existing piles to satisfy all current standards. . [0004] The present invention has been conceived in order to solve the above-mentioned problems, and an object of the present invention is to reduce the amount of waste by removing the existing pile foundation and to use the existing pile foundation as it is without removing it. It is an object of the present invention to provide a foundation of a building capable of shortening a construction period and realizing a degree of freedom in dividing a new building. SUMMARY OF THE INVENTION The present invention according to the above object is to remove an existing building while leaving a pile foundation, and to drive a new pile into the ground between the pile rows of the existing pile foundation to newly form the pile. While installing a pile row, a new foundation is freely provided in the horizontal direction on the existing pile foundation, and only the vertical load is loaded on the existing pile foundation, and the new foundation and the new pile are integrated by rigid connection, It consists of a new pile bearing both vertical and horizontal loads. [0006] Installation of the new foundation on an existing pile foundation is as follows.
Performed through slip bearings or laminated rubber isolators. In addition, by using a mat foundation as a new foundation, it is possible to provide a degree of freedom in installing a new pillar. FIG. 1 to FIG. 5 show an embodiment of the present invention. In the drawings, reference numeral 11 denotes a pile foundation after an existing building has been removed, and a pile foundation 11 is provided on the ground 12 at regular intervals. It is supported by the installed existing pile 13. This existing pile foundation 11 is an existing pile 1
An existing base beam 15 is provided on an existing bottom slab 14 connected to the base 3, and the existing slab 16 is supported by the existing base beam 15. [0008] 17 is a new pile made of reinforced concrete,
The existing pile base 11 is pierced into the underground 12 at the center between the existing pile rows, and as shown in FIG. 2, a new pile row is formed alternately with the existing pile row. Numeral 18 denotes a new foundation provided on the existing pile foundation 11, which is constituted by a half PC version 19 and a mat foundation 20 thereon.
It is mounted on the laminated rubber isolator 21 installed on the top 4 and is freely provided in the horizontal direction, so that the existing pile foundation 11 can bear only a vertical load. The new foundation 18 is integrated with the new pile 13 by rigid connection, and bears both a vertical load and a horizontal load on the new pile 13. In addition, 22 is a pillar of a building on a new foundation. FIG. 3 to FIG. 5 are process explanatory diagrams. A hole 23 is formed in the existing bottom slab 14 and the existing slab 16 corresponding to the center between the piles of the pile foundation 11 after removing the existing building, and a new hole is formed from the hole 23. The pile hole 24 for the pile is inserted into the underground 12 between the existing pile rows.
Excavation using an auger or the like. After the excavation, a reinforcing bar is assembled and inserted into the pile hole 24, and concrete is cast to complete the new pile 13. Next, the laminated rubber isolator 21 is placed on the existing foundation beam 15 of the existing slab 16, and a half PC plate 19 is placed thereon to perform reinforcement, and the reinforcement and the new pile After mating with the 13 rebars, concrete is cast to complete the mat foundation 20. By this casting of the concrete, the new foundation 18 is rigidly connected to the new pile 13 and bears the vertical load and the horizontal load applied to the new foundation 18. As described above, the present invention utilizes the existing pile foundation without removing the existing pile together with the existing pile as a foundation for a new building, so that the amount of waste due to the removal can be greatly reduced and the removal work can be carried out. Since it is not necessary, it is possible to shorten the time required for remodeling and reduce costs. In addition, since the vertical load is borne by both the existing piles and the new piles, the burden of the new piles is reduced, and the new foundation can be borne on the existing piles freely in the horizontal direction. Since horizontal load is not applied, existing piles function well as piles to support new foundations, even if horizontal resistance is not examined. Furthermore, since a mat foundation can be adopted as a new foundation, the load can be easily dispersed and the pillars of a new building can be freely divided.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic vertical sectional view showing one embodiment of a new foundation for a building using an existing pile foundation according to the present invention. FIG. 2 is a schematic plan view showing an arrangement state of an existing pile and a new pile according to the first embodiment. FIG. 3 is a schematic vertical sectional view showing a state of an existing pile foundation after removing an existing building. FIG. 4 is a schematic longitudinal sectional view showing a state of driving a new pile. FIG. 5 is a schematic longitudinal sectional view showing a state of placing a new foundation after completion of a new pile. FIG. 6 is an explanatory diagram of an existing building supported by a pile foundation. FIG. 7 is a diagram showing an example of removing an existing pile after removing an existing building. [Description of Signs] 11 Existing pile foundation 12 Underground 13 Existing pile 17 New pile 18 New foundation 19 Half PC version 20 Mat foundation 21 Laminated rubber isolator

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Claims (1)

(57) [Claims] [Claim 1] The existing building is removed while leaving the pile foundation, and a new pile is laid in the ground between the pile rows of the existing pile foundation to install a new pile row. At the same time, a new foundation is freely provided in the horizontal direction on the existing pile foundation, only the vertical load is borne on the existing pile foundation, and the new foundation is integrated with the new pile by rigid connection, and the vertical load is applied to the new pile. A foundation for a new building using an existing pile foundation, characterized by a structure that bears both horizontal and horizontal loads.