JPH09302650A - Buried pile for foundation construction - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a buried pile for foundation construction which easily reaches a support layer, and which can be inserted into the support layer for a necessary depth. SOLUTION: A buried pile 1 is linked by welding a link pipe 4 including a spiral blade 3 with an end part of a steel pipe 2 as a pipe member. This link pipe 4 is fixed by welding the spiral blade 3 for one and half round of rotation with an inner surface of it, where four cutting teeth 6,... are protruded at a tip edge of it. Two cutting teeth 7, 7 are protruded from a lower end of the blade 3. In the buried pile 1, soil cutting action is achieved by the blade 3 to provide a large input of cutting pressure even with input of a limited cutting pressure of a construction machine, so it easily reaches a support layer, and that it can be inserted to the support layer for a necessary depth. After burying it, sinking of the buried pile 1 is prevented by action of the blade 3, thereby supporting force is increased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tubular embedded pile for foundation work such as a steel pipe pile or a concrete pipe pile which is rotated about its central axis and screwed into the soil.

[0002]

2. Description of the Related Art A conventional general embedded pile is composed of a steel pipe or a concrete pipe provided with cutting teeth at its tip edge. These embedding piles are set in a state where they are vertically erected with their tips aligned with the pile core that has been positioned on the ground beforehand, and then the rotary construction machine is connected to the upper end, and the embedding is performed while applying downward pressure. Rotate the pile with its central axis as the axis of rotation, make a hole in the soil and insert it (embed), and when it reaches the support layer in the soil, penetrate it for a predetermined length (usually more than twice the pile diameter is required) ) Was to do.

[0003]

In the above-mentioned conventional example, when the drilling pressure input of the construction machine is limited, the support layer cannot be reached, or even if the support layer is reached, the required penetration length cannot be obtained. There was a problem that there is. In addition, in recent years, the owner side often desires deeper penetration as a countermeasure against earthquakes, and there is a demand for a buried pile for foundation work that is easier to carry out and has a lower construction cost.

Further, when used in a support layer having a low N value (value indicating the hardness of the ground), there is a problem that sufficient support force cannot be obtained.

Further, in consideration of the above-mentioned problem that a sufficient supporting force cannot be obtained, it has been proposed that a spiral blade is provided on the outer periphery near the tip of the embedded pile. If it can penetrate into the support layer, the blade will prevent the embedded pile from sinking, so that the purpose can be achieved.However, since the drilled surface is wide and the resistance is large, a large drilling force input is required when embedding. However, when the ground is hard, there is a new problem that it may not reach the support layer with the limited drilling force input of the construction machine.

An object of the present invention is to solve the above-mentioned problems, and an object thereof is to provide an embedded pile for foundation construction which solves the problems.

[0007]

According to the present invention, firstly, for example, cutting teeth are provided at the tip edge of a tubular pipe material, and a spiral blade is provided inside the tip portion.

Secondly, the present invention is a foundation work in which a cutting tooth is provided at the tip edge of a tubular pipe material, a spiral blade is provided inside the tip portion, and the cutting tooth is provided at the tip of the blade. Embedded pile for.

Furthermore, the present invention thirdly uses a steel pipe as a pipe material in the first structure or the second structure.

Still further, in the fourth aspect of the present invention, a concrete pipe is used as the pipe material in the first structure or the second structure.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of the present invention will be described in detail below with reference to the accompanying drawings. Here, FIG. 1 of the accompanying drawings is a front view in which a main part is longitudinally cut, FIG. 2 is a bottom view, and FIG. 3 is a schematic front view showing a state in which a tip is embedded to a support layer by an embedding work.

As shown in FIGS. 1 and 2, the embedded pile 1
Is a steel pipe 2 fixed to the distal end of the steel pipe 2 by welding a connecting pipe 4 having a spiral blade 3 therein.
This weld is shown by the dotted line 5 in FIG.

As shown in FIGS. 1 and 2, the connecting pipe 4 is fixed to the inner surface of the spiral blade 3 by welding it to the inner surface thereof for one and a half revolutions. 6 ... is projected. Two cutting teeth 7, 7 are provided on the lower end of the blade 3 so as to project therefrom. The blade 3 is formed by welding a spiral partial blade 3a for one rotation and a spiral partial blade 3b for half rotation. This welded portion is shown by a dotted line 8 in FIG.

As shown in FIG. 3, the embedded pile 1 constructed as described above has the tip thereof set in a vertical state in accordance with the pile core of the ground previously positioned, and then the rotary type construction machine 9 is installed. When connecting to the upper end and applying downward pressure, the embedded pile 1 is rotated around its central axis to make a hole in the soil for rooting (embedding), and when reaching the support layer 10 in the soil Long penetration (usually it is necessary to penetrate more than twice the pile diameter). The construction machine 9 has a cap 9a that is detachably fixed to the upper end of the embedded pile 1, and a motor 9b for rotating the cap 9a.

In the buried pile 1, since the blade 3 has a function of cutting the soil inside, a large hole-pressing force is input, and the support layer 10 is not only easily reached, but also the support layer 1
It is extremely easy to penetrate into the support layer 10 as required, and the blade 3 is provided with the cutting teeth 7 and 7, so that the cutting action is further improved and the supporting layer 10 having a low N value is used.
Even if it is used, the blade 3 prevents the sinking, so that a sufficient supporting force can be obtained.

Next, embodiments of the concrete pipe of the present invention will be described.

This concrete pipe embedding pile uses a prefabricated concrete pipe embedding pile provided with cutting teeth at its tip. The spiral blade is fixed to the inner surface of the embedding pile, and the outer diameter Reinforcement by fitting a connecting pipe (see FIG. 1) set to be smaller than the inner diameter of the embedded pile inside the tip portion of the embedded pile, and winding the tip of the connecting pipe around the outer periphery of the tip of the ready-made embedded pile. It is constructed by welding to the band. Cutting edges are provided at the tip of the blade.

Since the hole press-fitting operation of the embedded pile is the same as that of the first embodiment, the description thereof will be omitted. Since this embedded pile can use a ready-made embedded pile, the manufacturing cost can be reduced, and the connecting pipe can be welded at the construction site according to the situation of the ground, or the ready-made embedded pile can be used as it is. Is possible.

Next, another embodiment of the concrete pipe of the present invention will be described.

In the concrete embedded pile according to this embodiment, a spiral blade having cutting teeth is arranged on the inner side of the tip portion, and a plurality of cutting teeth is arranged on the tip edge of the molding die. Then, it is formed by pouring concrete.

The hole punching and press-fitting operation of the embedded pile according to this embodiment is the same as that of each of the above-mentioned embodiments, and the description thereof will be omitted. Since the blade can be fixed to the embedded pile when pouring concrete, it is not necessary to perform a fixing process and the manufacturing is simple.

The present invention is not limited to the above-mentioned respective embodiments, and for example, a spiral blade may be separately fixed to the outer periphery of the tip of the embedded pile.

[0023]

As described above, according to the present invention as set forth in claim 1 or 3, the blade 3 exerts the action of cutting the inner soil even when the drilling pressure input of the limited construction machine is input. Since the hole punching force input is large, not only can it easily reach the support layer, but it can also penetrate into the support layer as much as necessary, and even if it is used for a support layer with a low N value, the blade will not sink Therefore, there is an effect that a sufficient supporting force can be obtained.

Further, according to the present invention as set forth in claim 2 or claim 3, since the blade is provided with cutting teeth, the punching force input is larger and not only can it easily reach the support layer, but also the support layer. It is possible to more easily penetrate as much as necessary, and even when it is used for a support layer having a low N value, the blade is prevented from sinking, so that sufficient support force can be obtained.

Further, the present invention according to claim 4 is
Even if the drilling force input of a limited construction machine is large, the drilling force input is large, so not only can it easily reach the support layer, but it can also penetrate the support layer as much as necessary, and it can be used for the support layer with a low N value. Even if used, the blade will prevent the sinking,
In addition to obtaining a sufficient supporting force, if the blade is fixed when pouring concrete, it is not necessary to perform a fixing process, and the manufacturing is simple.

[Brief description of drawings]

FIG. 1 is a front view in which a main part is longitudinally cut.

FIG. 2 is a bottom view.

FIG. 3 is a schematic front view showing a state in which the tip is embedded up to the support layer by the embedding work.

[Explanation of symbols]

 1 Embedded Pile 2 Steel Pipe 3 Blade 4 Connecting Pipe 6, 7 Incisor 9 Construction Machine 10 Support Layer

Claims (4)

[Claims] 1. An embedded pile for foundation construction, wherein a cutting tooth is provided on a tip edge of a tubular pipe material, and a spiral blade is provided inside the tip portion. 2. An embedded pile for foundation construction in which a cutting tooth is provided on the tip edge of a tubular pipe material, a spiral blade is provided inside the tip portion, and the cutting tooth is provided on the tip of the blade. 3. The embedded pile for foundation construction according to claim 1, wherein a steel pipe is used as the pipe material. 4. The embedded pile for foundation work according to claim 1, wherein a concrete pipe is used as the pipe material.