JPH09279607A - Formation method of foundation in building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a formation method of a foundation in a building which is arranged to eliminate the need for the treatment of a pile head or an anchor bolt mounting work to concrete. SOLUTION: A tubular pile 2, which forms a bolt hole 1 on one end is buried underground according to an embedment method. On one hand, a ring-shaped flange 4 is fixed to a steel pipe 3 which is internally fitted in the pile 2 and serves as a column of a building. A through hole 5 equivalent to the bolt hole 1 is formed on this flange 4 where a bolt 6 is screwed into the bolt hole 1 from the through hole 5 after the steel pipe 3 is penetrated into the pile 2, thereby fixing the steel pipe 3 with the pile 2 integrally.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of forming a foundation portion in a building, and more particularly to a structure for fixing a steel pipe to be a pillar of the building on a prefabricated pile driven into the ground.

[0002]

2. Description of the Related Art Conventionally, in a relatively large building made of reinforced concrete, a structure shown in FIG. That is, in the conventional foundation portion, a concrete pile 10 is driven until it reaches a stratum 11 such as a solid rock, and after the pile is driven, a hole is dug in the ground surface 12 to construct a foundation, and the pile 10 is formed on the upper surface of the pile 10 as shown in FIG. The footing 13 as shown in FIG.

However, according to the conventional method, the positional accuracy of the pile is low and it is difficult to align it with the pillar position. Therefore, it was necessary to compensate for the positional deviation of the piles, and this correction was substantially processed by footing. In addition, the pile height must be accurate in order to cover the reinforcing bars. However, a certain level of high or low is corrected by cutting or reinforcing the reinforcing bar.

After the height of the pile 11 is corrected in this manner, the split groundwork 16 and the waste concrete 17 are formed. A pillar portion 14 is integrally formed with the footing 13, and an anchor bolt 15 is embedded in the upper surface of the pillar portion 14. The anchor bolt 15 fixes a column (not shown). Fig. 5 for actual construction
As shown in, a footing 13 is placed on a large number of piles 10 to support the load of the building.

[0005]

However, a large number of piles 10
It is troublesome to correct the height of the pile by cutting or reinforcing the reinforcing bar, and when it is cut, there are problems such as reduction in strength of the pile and industrial waste. Further, the anchor bolts 15 must be integrally embedded in the concrete pillars 14, but if the positional accuracy of the anchor bolts 15 is poor, it will be difficult to connect to the pillars (not shown). This is a cause of increase in construction amount and construction defects. Further, since the pillar and the pile have different cores, the load transmission is indirectly transmitted to the pile through the footing, which causes a problem that eccentric stress occurs.

The object of the present invention is to solve the above-mentioned conventional problems, and it is not necessary to treat pile heads or to attach anchor bolts to concrete, thereby reducing the amount of work and construction defects. Another object of the present invention is to provide a method of forming a foundation part in a building, which is capable of reliably supporting the load of the column.

[0007]

The present invention is a method of forming a foundation portion in a building, which has the following constitution in order to solve the above-mentioned technical problems. That is, the method of forming a foundation part in a building of the present invention is to bury a tubular pile in the ground by an embedding method, to attach an annular flange to the outer peripheral portion of a steel pipe to be a pillar of the building, and to lower the flange. Of the steel pipe portion of the pile is inserted into the inside of the pile and the flange is seated on and supported by the upper end surface of the pile, and then the flange and the upper end surface of the pile are fixed by a connecting means. .

Here, the tubular piles, which are important constituent elements in the present invention, include those made of concrete and those made of steel. Such a pile can be buried by the embedding method. In the embedding method, the position where the pile is buried is drilled with an auger, cement milk or the like is poured into the drilled portion, and the pile is dropped into the hole to fix it.

Further, when the flanges attached to the outer peripheral portion of the steel pipe to be the pillar of the building and the upper end surface of the pile can be joined by welding or the like, the method can be used. Furthermore, it is preferable that the steel pipe column is formed with an outer diameter that fits relatively tightly inside the pile.

<Concrete Configuration of the Present Invention> The method of forming a foundation portion in a building according to the present invention comprises the above-mentioned essential components, and the components are specifically as follows. Also holds. The specific component thereof, the upper end surface of the pile is provided with a large number of bolt holes, the annular flange is provided with a through hole that aligns with a large number of bolt holes formed in the upper end surface of the pile, The connecting means is a fastening bolt that inserts the upper end surface of the pile and the flange seated on the pile through the through holes of the flange, and is screwed into corresponding bolt holes of the upper end surface of the pile.

A bolt hole is provided at the upper end of the tubular pile 6
It is preferable to provide about 1 to 12 places. This bolt hole may be provided directly on the pile, but it may be provided on a ring-shaped iron plate different from the pile and the iron plate may be welded to the pile if possible. The flange can be attached by fixing the flange on the steel pipe. Welding is suitable for this fixing.

This method of connecting the flange and the upper end surface of the pile is particularly effective when the foundation pile is made of concrete. When the piles are buried by the embedding method as described above, since the positional accuracy is extremely high, it becomes possible to directly connect the steel pipes, which will be the pillars of the building, to the foundation piles. This is because it is basically impossible to change the position of the pillar, so it is not possible to make a direct connection by the conventional pile installation method by driving, and mounting the footing on the pile covers the poor position accuracy of the pile. Because I was doing it.

Further, in the method of forming a base portion according to the present invention, since the depth accuracy of the pile is high, it is not necessary to perform height adjustment by cutting as in the conventional case. Then, the load of the steel pipe column is directly supported by the pile. Further, in each of the above-mentioned features of the present invention, it is also preferable that the pressure receiving body is fixed inside the pile, and the lower end of the steel pipe abuts on the pressure receiving body in a state where the steel pipe is integrally connected to the pile.

The pressure receiving body may be of any type as long as it can bear the load of the steel pipe by contacting the lower end of the steel pipe. For example, a disc-shaped or ring-shaped iron plate is welded to the inside of the pile. It can be Alternatively, the inside of the steel pipe may be filled with concrete to form it. Further, a step may be formed inside the steel pipe. According to this method, since the load of the steel pipe is distributed between the flange and the lower end of the steel pipe, there is an advantage that a large load can be endured.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a method for forming a base portion in a building according to the present invention will be described in more detail with reference to the embodiments shown in the drawings. 1 to 3 show a base portion formed based on a method of forming a base portion in a building according to an embodiment of the present invention.

The base portion formed by this embodiment is
The steel pipes 3 that will be pillars of the building are directly connected to the piles 2 buried in the ground to significantly reduce the labor of the foundation work. The pile 2 is formed in a tubular shape as shown in FIG.
It is buried in the ground by the embedding method. The embedding method is to pierce the pile 2 with an auger (not shown) and pour cement milk 18 or the like into the pierced portion,
The pile 2 is fixed by dropping it in it.

According to this embedding method, the horizontal and vertical positions do not become out of alignment as in the case of the conventional driving, and extremely accurate installation is possible in combination with the recent advances in surveying technology.

Ten bolt holes 1 are formed on the upper end surface of the pile 2. The number of the bolt holes 1 is determined by the shape (diameter, type) of the ready-made pile. The bolt hole 1
May be directly provided on the pile 2 or may be provided on a ring-shaped iron plate (not shown) different from the pile 2 and the iron plate may be welded to the upper surface of the pile 2.

A steel pipe 3 which is a pillar of a building is fitted inside the pile 2. An annular flange 4 is provided on the outer peripheral portion of the steel pipe 3.
Are fixed by welding. Ten through holes 5 are formed in this flange 4 so as to be aligned with each bolt hole 1, and when the steel pipe 3 is fitted into the pile 2, the flange 4 will be
It comes into close contact with the upper surface of.

In this way, the steel pipe 3 is inserted into the inside of the pile 2,
After the flange 4 is brought into close contact with the upper surface of the pile 2, the bolt 6 is screwed into the bolt hole 1 from the through hole 5 to integrally fix the steel pipe 3 to the pile 2 for completion.

As described above, since the pile 2 is buried at the position as designed, the pillar (steel pipe 3) whose installation position is strictly regulated can be accurately matched, and the direct connection between the two is possible. It will be possible.

Next, a method of forming a foundation portion in a building according to another embodiment of the present invention will be described. In this foundation forming method, the pressure receiving body 7 is fixed to the inside of the pile 2, and the lower end of the steel pipe 3 is brought into contact with the pressure receiving body 7 while the steel pipe 3 is integrally fixed to the pile 2. this is,
When all the load of the steel pipe 3 is concentrated on the flange 4, the problem that when the flange 4 is welded to the outer peripheral portion of the steel pipe, a load is applied to that portion is solved.

The lower end of the steel pipe 3 comes into contact with the pressure receiving body 7 so that the steel pipe 3
Any material can be used as long as it can bear the load of, for example, as shown in FIG. 3, it can be formed by welding a ring-shaped iron plate inside the steel pipe 3. Moreover, the inside of the steel pipe 3 is filled with concrete, or the steel pipe 3
You may form a level | step difference inside.

In this method, the load of the steel pipe 3 is distributed between the flange 4 and the lower end of the steel pipe 3, so that it is possible to withstand a large load of the building. As described above, since the pile 2 is embedded by the embedding method in the method of forming the foundation portion in the building of the present invention, the positional accuracy is extremely high, and it is possible to directly connect the steel pipe 3 that will be the pillar of the building. Became. Further, since the load of the column (steel pipe 3) is directly supported by the pile 2, high strength can be obtained. Further, since a high depth accuracy of the pile 2 can be obtained, it is not necessary to adjust the height by cutting as in the conventional case.

Moreover, since the bolt hole 1 can be formed by drilling, the position is extremely accurate, there is no need for on-site alignment, and there is no need to embed anchor bolts or the like in concrete as in the conventional case. Since it can be installed in advance, the amount of work on site can be greatly reduced. Furthermore, a construction method without footing is also possible.

[0026]

As described above, according to the method of forming a foundation portion in a building of the present invention, since the foundation pile is embedded by the embedding method, extremely high positional accuracy can be obtained and height adjustment can be performed. The cutting process for
As a result, the piles and columns can be directly connected, and a very high bearing strength for the building can be obtained.

[Brief description of drawings]

FIG. 1 is a perspective view illustrating a state before a pile and a steel pipe are connected, which is a process of forming a foundation portion formed by a method of forming a foundation portion in a building according to an embodiment of the present invention.

FIG. 2 is a perspective view illustrating a state after the pile and the steel pipe shown in FIG. 1 are connected.

FIG. 3 is a cross-sectional view showing a foundation formed by a method of forming a foundation in a building according to another embodiment of the present invention.

FIG. 4 is a cross-sectional view showing a foundation portion in a conventional building.

FIG. 5 is a perspective view showing a foundation portion of a conventional building.

[Explanation of symbols]

 1 Bolt hole 2 Pile 3 Steel pipe 4 Flange 5 Through hole 6 Bolt 7 Pressure receiver

Claims (3)

[Claims] 1. A tubular pile is buried in the ground by an embedding method, an annular flange is attached to an outer peripheral portion of a steel pipe to be a pillar of a building, and the steel pipe portion below the flange is inside the pile. A method for forming a foundation part in a building, characterized in that the flange is seated on an upper end surface of the pile and supported, and then the flange and the upper end surface of the pile are fixed by a connecting means. 2. The pile has an upper end surface provided with a large number of bolt holes, the annular flange has a through hole aligned with a large number of bolt holes formed in the upper end surface of the pile, and the connecting means comprises: It is a fastening bolt which inserts the upper end surface of the pile and the flange seated on it from each through hole of the flange, and is screwed into each corresponding bolt hole of the upper end surface of the pile. A method for forming a foundation in the described building. 3. The pressure receiving body is fixed to the inside of the pile, and the lower end of the steel pipe abuts on the pressure receiving body in a state where the steel pipe is integrally connected to the pile. A method for forming a foundation in the described building.