JPS62160321A - Earthquake proofing and reinforcing work for pile foundation structure - Google Patents

Abstract

PURPOSE:To permit horizontal forces applying to a pile to be shared to a continuous wall by connecting a continuous underground wall constructed in the surrounding ground with the base beams of a structure supported by the pile foundation with slabs and/or connecting beams. CONSTITUTION:In supporting a basement or a structure A having a shallow base setting portion by penetrating piles 1 into the ground 3 until the bearing ground 2 is reached, a continuous wall 4 constructed in the surrounding ground of the structure A is connected to the base beams of the structure A with slabs 5 and/or connecting beams 6. Horizontal forces F applying to the structure A when earthquake occurs are transmitted through the slabs 5 and/or beams 6 to the wall 4, and most of the forces of earthquake is shared to the wall 4 and only the vertical bearing forces are almost shared to the piles 1. The breakage of the pile body and head by earthquake can thus be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a seismic reinforcement method for pile foundations of structures that do not have basements or foundation penetration, or have shallow foundation penetration.

(Prior Art) Conventionally, this type of structure was constructed as shown in Figs. 5 and 6.
(Problem to be Solved by the Invention) In this case, the earthquake horizontal external force Fi pile (c ) and structure (A)
The load must be borne only by the friction on the bottom of the pile, and in the event of a pile failure, conventionally a new pile was constructed and reinforced.

In addition, in order for the pile (c) to withstand the earthquake horizontal external force F, it is necessary to ensure the earthquake-resistant elements of the cage, such as the horizontal bearing capacity of the pile, the number of piles, the cross section of the pile, and the ground improvement around the pile. There was a problem.

(Means for Solving All Problems) The present invention was proposed in order to solve these problems, and it is a method that is supported by pile foundations that do not have a basement or a foundation root, or have a shallow foundation root. After constructing a continuous underground wall in the outer ground of the structure, the underground wall is connected to the foundation beam of the structure with a full slab and/or a connecting beam,
This invention relates to a seismic reinforcement method for a pile foundation structure, which is characterized in that the horizontal force applied to the pile during an earthquake is shared by the continuous wall.

(Function) In the seismic reinforcement method according to the present invention, a continuous underground wall is entirely constructed in the outer ground of a structure supported by a pile foundation, which has no basement or foundation root, or has a shallow foundation root, Thereafter, the continuous underground wall and the foundation beam of the structure are connected by a slab or a connecting beam, or a slab and a connecting beam, so that the horizontal external force applied to the pile during an earthquake is transferred to the slab and/or the foundation beam. Or it is shared with the continuous underground wall through the entire connecting beam.

(Effects of the Invention) As described above, according to the present invention, most of the horizontal external force applied during an earthquake is distributed to the continuous underground wall built in the ground around the structure, and therefore the piles are mostly supported vertically. It is only necessary to bear the full force, and destruction of the antibody and the pile cap is prevented.

In addition, according to this method, a continuous underground wall is provided around the structure,
Since the existing pile foundation structure can be reinforced simply by connecting the underground wall to the foundation beam of the structure, it is necessary to reinforce not only the piles on the outside of the structure but also the piles inside the structure. It is easier to construct than conventional methods of reinforcing pile foundations for existing structures.

(Example) The present invention will be described below with reference to the illustrated embodiments.

In the examples shown in Figures 1 and 2, (1) is a pile that has penetrated into the ground (3) until it reaches the supporting ground (2), and there is a basement or foundation root on the same pile (1). Or, a structure (A) with a shallow foundation has been constructed.

Then, an underground continuous wall (4) is constructed in the ground around the outer periphery of the structure 4, and the underground continuous wall (4) and the foundation beam of the structure (A) are connected to the slab (5) and/or Connect with beam (6).

Note that one of the slab (5) and the connecting beam (6) can be omitted depending on the situation.

Since the illustrated embodiment is configured as described above, the seismic horizontal external force F applied to the structure (A) during an earthquake is applied to the underground continuous wall (4) via the slab (5J and the connecting beam (6)). It is transmitted to.

According to the above embodiment, most of the seismic force is borne by the underground continuous wall (4), so the pile (II) only needs to bear almost only the vertical bearing capacity, and the pile destruction is prevented.

In addition, if the surface layer is soft ground, the continuous underground wall (4)
Earthquake resistance can be achieved by improving the surface ground at the same time as construction.

Figures 3 and 4 show all the embodiments in which the present invention is fully applied when there is not enough space around structure 4, where piles (1 ) and an integrated underground continuous wall (4).

Although the present invention has been described above with reference to embodiments, the present invention is, of course, not limited to such embodiments, and can be modified in various ways without departing from the spirit of the present invention. .

[Brief explanation of drawings]

FIGS. 1 and 2 are plan views of a vertical cross-sectional concave plate showing an embodiment of the seismic reinforcement method for pile foundation structures according to the present invention, and FIGS. 3 and 4 are respectively plan views of the present invention. FIGS. 5 and 6 are plan views of a vertical cross-section concave plate showing the implementation status of another embodiment, and FIGS. 5 and 6 are plan views of a vertical cross-section concave plate showing the implementation status of the conventional construction method, respectively.

Claims (1)

[Claims] After constructing a continuous underground wall in the outer ground of a structure that does not have a basement or a foundation root, or is supported by a pile foundation with a shallow foundation root, the underground wall and the foundation beam of the structure are constructed. A method for seismic reinforcement of a pile foundation structure, characterized in that the walls are connected by a slab and/or a connecting beam, and the horizontal force applied to the pile during an earthquake is shared by the continuous wall.