JPH0517939A - Precast pile with tubular bag unit - Google Patents

Abstract

PURPOSE:To provide a structure such as preventing leakage of consolidation fluid without displacing and dislocating a tubular bag unit by an injection pressure and weight in the case of forming an enlarged part by injecting the consolidation fluid of cement milk, mortar, etc., into the tubular bag unit mounted on a precast pile. CONSTITUTION:The upper and lower of a tubular bag unit 2 are mounted on a precast pile 1 by mounting metal fixtures 7 to fold back the tubular bag unit 2 on the one mounting metal fixture. The mounting metal fixture 7 in this part is coated with the folded back tubular bag unit 2 to expose the other mounting metal fixture on the outside of the tubular bag unit 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tubular bag used for forming an enlarged portion by injecting a solidifying fluid such as cement milk or mortar into a tubular bag attached to a ready-made pile. It relates to ready-made piles with bags.

[0002]

2. Description of the Related Art Conventionally, a method of using ready-made piles having a tubular bag has been developed in order to exert a high vertical supporting force. This ready-made pile is, for example, as shown in FIG. 6, in which the tubular bag body 2 is attached to the outer periphery of the tip of the ready-made pile 1. Such a ready-made pile 1 is disclosed, for example, in JP-A-63-149.
No. 25 publication.

The prefabricated pile 1 is embedded in a pre-excavated hole of a predetermined depth in the soil, and then a certain pressure is applied through the injection pipe 3 installed in the hollow portion of the tubular bag body 2 to the cement. A solidifying fluid 4 such as milk can be injected, and the tubular bag 2 is inflated to a predetermined size.

[0004]

The conventional method of attaching the tubular bag 2 to the prefabricated pile 1 is to insert the prefabricated pile 1 into the tubular bag 2 as shown in FIGS. The prefabricated pile 1 was tightened from above by the mounting hardware 7 via the cushioning material 6 on the outer peripheral surfaces 5 at both ends, and several notches 12 were made in the fixing metal fittings 13 arranged on the mounting hardware 7 to mount and fix them.

However, in this mounting method, when the pile diameter becomes large, or when the expanded diameter of the tubular bag body 2 becomes large due to this, the mounting metal 7 is displaced due to the injection pressure and weight of the solidifying fluid 4. There is a problem that the caking fluid 4 leaks. As a result, it is necessary to increase the width of the mounting hardware 7 at both upper and lower ends, or to make the mounting hardware 7 into two rows, three rows or triple quadruples, and increase the tightening force of the mounting hardware 7 to mount and fix it. It was uneconomical because it took a lot of time and labor.

[0006]

According to the present invention, the upper and lower sides of a tubular bag body are attached to ready-made piles by mounting hardware, and one mounting metal article is covered with the tubular bag body by folding back the tubular bag body. The other fitting is a ready-made pile with a tubular bag body, which is exposed to the outside of the tubular bag body. To make such a structure, for example, mount the tubular bag body downward at the mounting position with the mounting hardware, then fold the tubular bag body and mount it with the mounting hardware at the upper mounting position. The above structure can be obtained by

[0007]

According to the present invention, since either one end of the tubular bag is folded and attached to the surface of the pile body, even if the pile diameter is increased or the expanded diameter of the tubular bag body is increased, the attachment is performed depending on the injection pressure. It is possible to alleviate the push-out force that acts on the metal object and prevent slippage and leakage. Since it has such an effect, either end may be folded back. However, if the bottom edge of the ready-made pile is equipped with a friction cutter, etc., it is desirable to fold the top edge because it can play the role of preventing misalignment.

The tubular bag used in the present invention is preferably made of cloth, and water contained in the solidifying fluid such as cement milk or mortar is dehydrated out of the tubular bag. As a result, a strong cured product can be molded in the tubular bag.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the drawings. The ready-made pile 1 used in this example is a concrete pile having the structure shown in FIG. A diameter of 16 mm is used as the friction cutter 9 to protect the tubular bag 2 when the pile is sunk in the lower part.
The rebar rod is attached to the skirt fitting 10. Pile diameter Di
Is 350 mm and the pile length is 3 m. Further, a gas pipe having a diameter of 25 mm is provided as an injection pipe 3 in the center of the hollow portion of the pile, and the gas pipe has a cylindrical shape so that the cement milk 4 can be injected into the cylindrical bag body 2 through the gas pipe. It has a T-shaped portion that communicates with the bag body 2.

The material of the tubular bag body 2 is nylon 66, the upper and lower ends of the tubular bag body 2 are doubled, and the hemp rope 8 is arranged at the double end portion, and further tacked. The diameter of the mounting portion was 400 mm. The size of the tubular bag 2 used was such that the diameter D after injection of cement milk was 620 mm and the length was 2300 mm. This tubular bag body 2 is turned upside down so that the front side is the back side, and the lower portion of the tubular bag body 2 is attached with the mounting hardware 7 at the upper mounting position, and the tubular bag body 2 is turned upside down so that the front side is on the front side. The end portion was fixed to the prefabricated pile 1 with the mounting hardware 7.

That is, as shown in FIG. 2, at the upper end, a cushioning material 6 of polyurethane foam having a width of 75 mm and a thickness of 10 mm is wound around the mounting portion of the prefabricated pile 1 and then the tubular bag body 2 is set to have a width of 32 mm and a thickness of 1. The mounting hardware 7 made of steel for packing of 2 mm is fastened in double in a row, and several notches 12 are made in the fixing metal fitting 11 as shown in FIG. afterwards,
As shown in FIG. 3, the tubular bag body 2 is turned upside down and the lower end is attached. The lower end is a friction cutter 9 as shown in Fig. 4.
Place it as close as possible to and fix it like the upper end.

[0012]

EFFECTS OF THE INVENTION The ready-made pile having the tubular bag body according to the present invention is a tubular bag body when the tubular bag body has a large diameter and when the solidifying fluid reaches a predetermined injection pressure. The tubular bag body can be inflated to a predetermined diameter without being detached or displaced or the cement milk leaking. Moreover, the mounting work of the tubular bag is much easier than the conventional one.

[Brief description of drawings]

FIG. 1 is a half cross-sectional view of ready-made piles when a solidifying fluid is injected into the tubular bag body of the present invention to expand and expand the tubular bag body.

FIG. 2 is an enlarged cross-sectional view of a tubular bag mounting portion A at the upper end shown in FIG.

FIG. 3 is an enlarged front view of a cylindrical bag mounting portion A at the upper end shown in FIG.

FIG. 4 is an enlarged cross-sectional view of a lower end tubular bag mounting portion A shown in FIG.

5 is an enlarged front view of the tubular bag mounting portion A at the lower end shown in FIG. 1. FIG.

FIG. 6 is a half cross-sectional view when a solidifying fluid is injected into the tubular bag body of a ready-made pile of the related art to expand and inflate the tubular bag body.

FIG. 7 is an enlarged cross-sectional view of the upper and lower tubular bag mounting portions C shown in FIG.

FIG. 8 is an enlarged front view of the upper cylindrical bag mounting portion C shown in FIG.

[Explanation of symbols]

 1 Ready-made pile 2 Cylindrical bag body 3 Injection pipe 4 Solidifying fluid 5 Pile outer peripheral surface 6 Cushion material 7 Mounting hardware 8 Rope 9 Friction cutter 10 Skirt metal fitting 11 Fixing metal fitting 12 Notch

Claims (1)

Claims: 1. The upper and lower sides of a tubular bag body are attached to ready-made piles by mounting hardware, and one mounting hardware is covered with the tubular bag body by folding back the tubular bag body. The other mounting hardware is exposed to the outside of the tubular bag body, which is a ready-made pile with a tubular bag body.