JPS6312194Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is configured to support vertical loads by inserting multiple ready-made piles into the supporting layer in the soil, and attaches the pile heads of these vertical load-supporting piles to the footings. This relates to the improvement of fixed foundation piles for buildings.

Such foundation piles support not only vertical loads but also horizontal loads, but conventionally,
The number of ready-made piles was determined primarily by considering only the vertical load. Therefore, when an earthquake with strong transverse waves occurs and a large horizontal load is applied to the foundation pile, the upper part of the prefabricated pile easily breaks, causing the building to collapse. This fact can be easily understood by examining the state of collapse of buildings due to earthquakes, and based on this current situation, the Ministry of Construction is currently taking measures to improve the foundations of buildings to withstand earthquake forces. Design guidelines are being considered. Of course, there is no problem if you increase the number of ready-made piles, but if you just increase the number, from the conventional thinking, you will need many long ready-made piles that reach the support layer, and the extended excavation length will be longer than necessary. This results in various drawbacks, such as lengthening the construction period and increasing costs.

The present invention was developed in view of the current situation, and aims to provide a practical foundation pile that can reliably support large horizontal loads with only a slightly longer excavation length. It is.

The implementation mode of the present invention will be explained based on an illustrative diagram. In the diagram, 1 is a ready-made concrete pile with prestress introduced, and a total of four such ready-made piles 1 are installed in a support layer 2 in the soil. The pile heads of these ready-made vertical load supporting piles 1 are
They are each fixed to a footing 3 of a building not shown. Reference numeral 4 denotes a horizontal load supporting pile mainly for supporting horizontal loads, and a cushioning material 5 made of foamed polystyrene having closed cells is fixed to the tip of the pile with packing tape, adhesive, etc. to substantially increase the tip supporting capacity. The length is such that when inserted into the soil, it reaches a depth that can be assumed to be semi-infinite (length sufficient to support only horizontal loads). is set to . The pile head of this horizontal load supporting pile 4 is also attached to the footing 3.
At the same time, an end plate 6 is attached to the pile head, and a steel frame 7 can be directly erected on the pile head via the end plate 6.

In this way, in addition to the vertical load supporting pile 1, the horizontal load supporting pile 4 is also inserted into the soil and the pile head is fixed to the footing 3, so even if an earthquake with strong transverse waves occurs, Even if a large horizontal load is applied, it can withstand the horizontal load sufficiently. In particular, the horizontal load supporting pile 4
It is sufficient that it does not substantially support vertical loads and only supports mainly horizontal loads, so its length is equal to the length of the vertical load supporting pile 1 inserted up to the support layer 2. It only takes about 1/3 of the length,
Not only does the pile itself need to be shorter, but the total length of excavation can be shortened, thereby shortening the construction period and reducing costs.

In addition, in the embodiment, the horizontal load supporting pile 4
The number x of the horizontal load supporting piles 4 is shown as follows: (cost per bottle). In addition, in the embodiment, a cushioning material 5 is provided at the tip of the horizontal load supporting pile 4.
is fixed and the vertical load is not applied to the horizontal load supporting pile 4 as much as possible. In cases where no vertical load is applied to the cushioning material 5, it is not necessarily necessary to fix the cushioning material 5.

As is clear from the above explanation, the foundation piles for buildings according to the present invention, in addition to the vertical load-supporting piles that are inserted into the supporting layer of the land, have a cushioning material attached to the lower end of the prefabricated concrete piles. Horizontal load supporting piles are also inserted into the soil and the pile heads are fixed to the footings, so even if a large horizontal load is generated in the event of an earthquake with strong transverse waves. Even if you are exposed to it, you can withstand it. Since this horizontal load supporting pile does not substantially support vertical loads, it is 1/4 to 1/4 of the normal vertical load supporting pile.
It only needs to be about 1/3 short, and therefore, the extended excavation length can be shortened, making it possible to shorten the construction period and reduce costs.

[Brief explanation of drawings]

The drawings illustrate an embodiment of the foundation pile for a building according to the present invention, FIG. 1 is a front view, and FIG. 2 is a front view.
FIG. 2 is a sectional view taken along the line - in FIG. 1; 1...Pile for vertical load support, 2...Support layer, 3...
...Footing, 4...Horizontal load supporting pile.

Claims (1)

[Scope of utility model registration request] In the foundation pile of a building, in which a plurality of ready-made concrete piles are inserted into the support layer in the soil to support vertical loads, and the pile heads of these vertical load-supporting piles are fixed to footings. , insert a horizontal load supporting pile into the soil with a buffer material attached to the lower end of the ready-made concrete pile so that no tip bearing capacity is generated, and insert the pile head of this horizontal load supporting pile into the footing. A building foundation pile characterized by being fixed.