JPH059934A - Tip pile having cloth cylinder body - Google Patents

Abstract

PURPOSE:To ensure adhesion of a ready-made pile to an expanded bulb part by pouring a solidifiable fluid body into a cloth cylinder body loaded on the ready-made pile around the outer peripheral surface of which a steel rod is wrapped and fixed over one or more round to form an expanded part. CONSTITUTION:A steel rod 2 is wrapped and fixed around the outer peripheral surface, which is planned to be covered with a cloth cylinder body 3, of a ready- made pile 1 such as a steel pipe pile, a concrete pile, a steel pipe-concrete composite pile, etc., about 300-600mm in diameter, about 2-4m long. As the steel rod 2, a round bar, a deformed bar, a PC steel bar, a piano wire, an iron wire, etc., are used, and the steel rod is wrapped around the outer peripheral surface of the ready-made pile 1 over at least one round. The cloth cylinder body 3 is put over the part on which the steel rod 2 is fixed, and the upper and lower parts of the cloth cylinder body are fastened by bands 5 respectively. It is favorable that the cloth cylinder body is shaped into a cylindrical body, and its material is synthetic fiber such as polyamide, etc., in respect to the dewatering property and strength of a solidifiable fluid body 4. Besides, the ready-made pile 1 is preliminarily provided with a pouring pipe 7 for pouring the solidifiable fluid body 4 into the cloth cylinder body 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ready-made pile equipped with a bag body used to form an enlarged portion by injecting cement milk, concrete or the like into the bag body fitted to the ready-made pile. ..

[0002]

2. Description of the Related Art Conventionally, ready-made piles having cloth cylinders have been developed in order to exert a high vertical supporting force. This pile is, for example, as shown in FIG.
As shown in Japanese Patent No. 122324, the pile is a pile in which a cloth cylinder is attached to the outer circumference of the tip of the ready-made pile.

This pile is embedded in a pre-excavated hole of a predetermined depth in the soil, and then cemented with cement milk or the like under a certain pressure through an injection pipe installed in the hollow portion of the pile in the cloth cylinder. It has a structure that allows injection of a sexual fluid. In this pile, since the surface of the ready-made pile is smooth, the adhesion between the bulb portion after solidifying fluid hardening and the ready-made pile is not sufficient, and when a large load acts, the adhesion will be broken and the pile will be destroyed. There was a problem that it would end up.

Therefore, as disclosed in Japanese Utility Model Laid-Open No. 62-148630, a method has been proposed in which the surface of a ready-made pile is provided with irregularities to enhance the adhesive force.

[0005]

However, since the ready-made pile has a cross-section missing in the recess 10 in this pile, there is a problem that cracks easily occur from the recess during transportation or construction of the pile. In addition, since the wall thickness of the ready-made pile must be increased by the amount corresponding to the lack of cross section, the volume of concrete increases, which is uneconomical.

The object of the present invention is, as mentioned above, that the adhesion to the bulb portion can be expected sufficiently even if the concrete portion of the ready-made pile is not provided with irregularities, and therefore there is no risk of cracking during transportation or construction, and It is an object of the present invention to provide a tip pile with a cloth cylinder, which is economical to manufacture.

[0007]

DISCLOSURE OF THE INVENTION The present invention is a pile in which a cloth cylinder is attached to the outer periphery of a ready-made pile by a band at the upper and lower parts thereof, and a solidifying fluid is injected into the cloth cylinder. The front end pile is characterized in that the reinforcing rod is fixed to the outer peripheral surface of the ready-made pile covered with the cloth tubular body for at least one round or more.

A description will be given below with reference to the drawings. FIG. 1 is an example of a pile of the present invention, in which reinforcing bars 2 are wound around several points on the outer peripheral surface of a steel pipe pile 1 and fixed to the pile, and a cloth cylinder 3 is attached to the pile from the top of the pile of cement milk or the like. It is a half cross-sectional view showing a state when the caking fluid 4 is press-fitted. This pile is usually used as the bottommost pile.

The ready-made piles used in the present invention are steel pipe piles, concrete piles, steel pipe concrete composite piles and the like. The outer diameter of the ready-made pile is usually 300 to 600 mmφ and the pile length is 2 to 4 m. As shown in FIG. 1, a reinforcing bar is wound around and fixed to the outer peripheral surface of a ready-made pile covered with a cloth cylinder. The reinforcing bars are round steel, deformed reinforcing bars, PC steel bars, piano wires, iron wires, etc., and at least one or more turns are wound around the outer circumference of the ready-made pile.
In order to improve the adhesive force, the number of turns is preferably 3 or more. The reinforcing bars may be wound independently of each other, or may be continuously wound in a spiral shape. Further, it may be wound in a spiral shape and then wound in a spiral shape in the opposite direction to form a mesh shape. The diameter of the reinforcing bar is preferably 5 to 20 mmφ, and more preferably 10 mmφ or more. Pitch is 5 to 20 cm
The spacing is appropriate. If the ready-made pile is a steel pipe pile, etc., it may be fixed by welding, but in the case of concrete pile, etc., a steel plate, etc., that surrounds the pile in advance so that the reinforcement can be partially welded, is provided. It is preferable to embed it. Of course, it is preferable that the reinforcing bars are welded all around, but depending on the load to be supported, welding may be performed only partially.

A cloth cylinder is covered so as to cover the portion to which the reinforcing bars are fixed, and the upper and lower parts are attached to the ready-made piles by the band 5. FIG. 2 shows an enlarged cross-sectional view of the cloth tubular body mounting portion A. The band is usually made of packing steel strip or wire rope. The band is usually fixed with a tightening force of about 1 to 4 tons. For packing strip steel, its width is 3
0 to 70 mm, diameter 10 to 20 for wire rope
It is about mmφ.

Further, if the cushion material 6 is arranged over the entire circumference between the cloth cylinder and the ready-made pile at the mounting portion, it is safe against leakage of the solidifying fluid. The material of the cushion material is polyvinyl chloride, polyethylene, foam such as polyurethane,
Alternatively, a material such as rubber that can close the gap between the cloth tubular body and the pile body after tightening the band can be used. The width of the cushion material should be wider than that of the band.
It is preferably about 200 mm. In addition, if reinforcing bars are provided between the bands, it is difficult to shift the mounting positions of the cloth cylinder and the pile during the concrete pouring.

The cloth cylinder has a cylindrical shape, and both ends of the cloth cylinder are contracted so as to be evenly attached to ready-made piles, tacked, and contact portions with the band are folded back to be reinforced. It may be structured. The cloth cylinder may be seamlessly woven from the beginning, or one cloth may be sprinkled in a cylindrical shape and sewn in a straight line to form the cylinder.
Alternatively, the tubular body may be formed by sewing in a spiral shape.

The material of the cloth cylinder is polyamide, polyester, vinylon, from the viewpoint of dehydration and strength of the caking fluid.
It is preferably a synthetic fiber such as polypropylene. When a material capable of discharging the water of the caking fluid is discharged to the outside in this way, a caking fluid such as cement milk is injected into the cloth cylinder of the pile body at the time of construction, and a predetermined pressure, for example, 6 to
Moisture in the caking fluid is dehydrated through the surface of the cloth cylinder by the injection pressure of 10 kg / cm ² , and the caking fluid becomes a dense and strong cured body after curing, which is preferable.

The pile also has an injection pipe 7 for injecting the solidifying fluid into the cloth cylinder. An iron pipe, a vinyl chloride pipe, or the like is used as the injection pipe.

[0015]

The present invention will be described in detail below with reference to examples. The pile used in this example has the structure shown in FIG. As the ready-made pile, a steel pipe pile having an outer diameter of 400 mmφ, a wall thickness of 6 mm and a length of 3 m was used. Diameter 1 on the periphery of this steel pile
Welded a 3 mmφ rebar around the entire circumference,
It was provided at 10 positions at m intervals. 600mm outer diameter from above
Approximately 1.5t with a wire rope with a diameter of 10mm and both ends covered with a nylon cloth cylinder with a diameter of 2.5m.
It was tightened with a force of on and fixed with a wire clip. The nylon cylinder is sewn in a spiral shape, and both ends are tacked so that the diameter of the mounting part is 430 mmφ.
The structure is as follows. In addition, a cushioning material is placed between the steel pipe pile and the cloth cylinder to prevent the solidifying fluid from leaking when pouring, and a wire rope is sandwiched on both sides with a reinforcing bar to prevent the fitting portion from slipping. Tightened.

Such a pile of the present invention was used as a lower pile of a concrete pile. The pile length is 15m and the top pile has a diameter of 4m.
It was a ready-made concrete pile with a length of 00 mm and a length of 12 m.
The upper and lower piles were connected by welding as usual. In the example, since steel pipe piles were used as ready-made piles, cracks do not occur at all during transportation or construction unlike conventional piles,
Since there is no cross-section loss, it is not necessary to increase the wall thickness, and since it is extremely easy to weld the reinforcing bars and attach the injection pipe, it was economical.

Further, when a load test was carried out after the construction and the supporting force was confirmed, a supporting force equivalent to that of a conventional pile having unevenness was obtained, and the adhesive force between the pile body and the bulb was the same as that of the conventional unevenly-shaped pile. It was confirmed that the same effect as the adhesive force of

[0018]

EFFECTS OF THE INVENTION By using the pile according to the present invention, not only a large supporting force can be obtained due to the adhesive force between the prefabricated pile and the bulb formed in the cloth cylinder, but also cracks occur during transportation or construction of the pile. There is no risk of damage to the pile, and since there is no cross-section loss, it is economical because there is no need to increase the wall thickness of the ready-made pile.

[Brief description of drawings]

FIG. 1 is a half cross-sectional view when a caking fluid is injected into a cloth cylinder of a pile of the present invention to expand and expand a bag body.

FIG. 2 is an enlarged cross-sectional view of a cloth tubular body mounting portion A shown in FIG.

FIG. 3 is a half cross-sectional view of a case in which a solidifying fluid is injected into the cloth cylinder of a conventional pile to expand and expand the bag body.

[Explanation of symbols]

 1-ready-made pile 2-reinforcing bar 3-cloth cylinder 4-solidifying fluid (bulb part) 5-band 6-cushion material 7-injection pipe 8-wire clip 9-concrete pile 10-recess

Claims (1)

Claim: What is claimed is: 1. A cloth cylinder is a pile in which upper and lower portions of the cloth cylinder are attached to the outer circumference of a ready-made pile by injection, and injection for injecting the solidifying fluid into the cloth cylinder is performed. Has a tube,
Furthermore, a tip pile characterized in that rebars are fixed to the outer peripheral surface of a ready-made pile covered with a cloth cylinder for at least one round.