JPH024729B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to piles with extremely high bearing capacity for use in architectural or civil engineering works.

(Prior Art) Piles with enlarged tips have been provided in order to provide support underground. These piles are manufactured at the construction site. for example,
A pile body consisting of a steel rod or steel pipe, etc., has a driving head fixed to its tip and a plurality of locking pieces that can be opened and closed by rotation and are fixed to the driving head. After excavating the soil layer around the locking piece, which is inserted into a pre-drilled hole and then expanded by rotating the pile body,
A pile having bearing capacity was constructed by injecting mortar, concrete, synthetic resin, etc. into the drilled hole to form a lump at the tip of the pile body.

(Problem to be Solved by the Invention) However, the conventional pile manufactured in this manner has a drawback in that the lumpy body at the tip tends to be eccentric with respect to its axis. In addition, in order to form a lump at the tip, a hole with a larger diameter than the pre-drilled hole must be made at the tip, so two types of excavators are required, or other means such as rotating the pile body are required. Construction machinery was required, and moreover, the disposal of the soil created by re-excavation required ingenuity. As a result, conventional piles have become expensive. Furthermore, these problems in manufacturing conventional piles have placed significant restrictions on integrated construction, such as construction of retaining walls. That is, in order to manufacture conventional piles, it is necessary to drill holes with a relatively large diameter, making it difficult to construct retaining walls and the like in soft ground. In addition, not only a large excavator but also other machinery such as a means to rotate the piles is required, so moving these construction machines not only impairs work efficiency, but also
This required a relatively large construction site, which not only increased the number of construction days and costs, but also posed the problem that construction was difficult in areas with a high concentration of people's homes and facilities.

The present invention has been made in order to improve the above-mentioned conventional drawbacks and solve the above-mentioned problems, and aims to provide a pile that can be manufactured extremely easily and has a significantly high underground bearing capacity. The purpose of the present invention is to provide a supporting pile that allows construction of retaining walls and the like to be carried out quickly and economically.

(Means for Solving the Problems) The support pile of the present invention has a plurality of substantially linear cuts along the axial direction of the outer tube at the tip of the peripheral wall of the outer tube of the pile body consisting of an outer tube and an inner tube. A closing fitting is attached to the opening at the tip of the pile body, and a heat-shrinkable tube is fitted and fixed to the peripheral wall of the outer tube to close the cut made at the tip of the peripheral wall. The structure is such that the swelling agent can be injected and filled into the gap formed between the outer tube and the inner tube from the rear end opening of the pile body.

(Function) An expansion agent is injected and filled into the gap between the outer pipe and the inner pipe that constitute the pile body to form downwardly opening tongues that increase the supporting capacity of the pile body.

(Example) Examples of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is an exploded overall perspective view showing one embodiment of the present invention. In the figure, reference numeral 1 denotes a pile main body, which is composed of an outer tube 2 and an inner tube 3, which are cylindrical bodies made of metal or synthetic resin. A small-diameter inner tube 3 is inserted into a large-diameter outer tube 2. A gap 4 of a constant width is formed between the outer tube 2 and the inner tube 3. End 2a of peripheral wall of outer tube 2
is provided with a plurality of substantially straight cuts 5 along the axial direction of the outer tube 2. The cuts 5 form a plurality of tongue pieces 21 that open downward when the outer tube 2 is stood upright. Figure 3 is the X in Figure 2.
- An X-ray cross-sectional view.

On the other hand, 6 in FIG. 1 is a closing fitting, and the rear end 6
c is attached to the tip opening 3a of the inner tube 3 of the pile body 1, and the center portion 6b is attached to the tip opening 2b of the outer tube 2 of the pile body 1.
Each is press-fitted and fixed. The blocking fitting 6 is the pile body 1
By being attached to the pile body 1, it is possible to prevent soil from entering the pile body 1 underground, and also to prevent
A storage chamber into which an expansion agent can be injected and filled is formed in the gap 4 between the two. Note that the attachment of the closing fitting 6 is not limited to that shown here. The closure fitting 6 is mainly used for driving, and the tip 6a has a sharp shape.

Reference numeral 7 denotes a heat-shrinkable tube, which is fitted and fixed onto the peripheral wall of the outer tube 2 of the pile body 1 so as to close the cuts 5 provided in the pile body 1. By fitting and fixing the heat-shrinkable tube 7 to the pile body 1 in this way, the underground 8
This can prevent dirt and water from entering into the pile body 1 through the cuts 5. In this way, the pile body 1 and the blocking fitting 6
The support pile A is composed of the heat-shrinkable tube 7 and the heat-shrinkable tube 7.

In addition, when driving the pile body 1 into the ground 8,
The heat-shrinkable tube 7 is poured with boiling water at about 70° C. to 100° C. to be heat-shrinked, so that it is fitted onto the peripheral wall of the pile body 1 and fixed, and the cut 5 described above is closed.

As explained above, in the above embodiment,
Approximately linear cuts 5 are provided at the tip of the circumferential wall of the outer tube 2 of the pile body 1, a closing fitting 6 is attached to the tip opening 2b of the outer tube 2, and a heat-shrinkable tube 7 is provided to close these cuts 5. Since it is constructed by simply fitting and fixing the pile body 1 to the peripheral wall of the outer tube 2, manufacturing is extremely easy and therefore inexpensive. Furthermore, since the heat-shrinkable tube 7 is externally fitted and fixed, it is possible to completely prevent dirt and water from entering into the pile main body 1 through the cuts 5 in the ground 8. It can be effectively applied to soil formed from sediment with small particle size, as well as to soft soil with a high moisture content. After driving or burying the pile at the site, if the expansion agent 9 is injected from the rear end opening of the pile main body 1, the expansion pressure causes the tongues 21 to stand up and open downward. Therefore, the bearing capacity of the support pile A in the soil becomes significantly high.
In addition, as will be explained in detail below, it is only necessary to make cuts 5 in the peripheral wall of the outer pipe 2 of the pile main body 1 at the factory and drive it at the site. Since it is only necessary to drill a hole with a diameter approximately equal to that of the ground, reinforcement work such as retaining walls can be done quickly and economically.

In addition, in the said Example, the pile main body 1 consists of a cylindrical body, but you may employ|adopt a hollow square column. The number of cuts 5 is preferably as large as possible, as long as it does not significantly affect the strength of the pile body 1.

Further, in the above embodiment, the pile main body 1 and the closure fitting 6 are separate members, but they may be formed integrally, or the tip opening 2b of the outer tube 2 and the rear end 6b of the closure fitting 6 may be formed integrally. It may also be a male and female threaded connection. Furthermore, the fourth
As shown in the figure, a fitting hole 6d is provided in the rear end 6c of the closure fitting 6, and a tip 3a of the inner pipe 3 of the pile body 1 is provided.
may be press-fitted and fixed. For burying, a closing metal fitting with a flat tip as shown in FIG. 5 may be used.

Further, in the above embodiment, the heat-shrinkable tube 7 is made of vinyl chloride resin, but it may be made of nylon resin, polyester resin, polypropylene resin, or the like. However, chemical resistance,
In terms of water resistance, weather resistance, and physical strength, those made of vinyl chloride resin are preferred. For example, "Kopalon S-Tube" manufactured by Gunkore Koubun Kogyo Co., Ltd.
(Product name) is preferably used. The heat-shrinkable tube 7 is open at both ends, but the tip may be bottomed, especially when it is used for burial. The pile body 1 may be coated.

Below, the underground action of the support pile A of the above example,
The effects will be explained in more detail.

First, the heat-shrinkable tube 7 is poured with boiling water at about 80° C. to 100° C. to cause it to shrink, and the heat-shrinkable tube 7 is fitted onto the peripheral wall of the pile body 1 and fixed, and each cut 5 is closed. Then, this support pile A is driven into the ground 8 to a desired depth. In this way, even if the support pile A is driven into the ground 8, the heat-shrinkable tube 7 prevents earth, sand, and water in the ground 8 from penetrating into the pile body 1.

The expansion agent 9 is injected and filled from the rear end opening of the support pile A driven in this manner up to the positions where the cuts 5 are provided. This swelling agent is a mixture of an inorganic compound mainly composed of silicate, a specific organic compound, and water. For example, a mixture of "Blystar" (trade name) manufactured by Onoda Cement Co., Ltd. and water can be suitably used. Note that a mixture of this expanding agent with a small amount of cement, mortar, etc. may also be used.

The injected expansion agent 9 hardens enormously and reaches its maximum expansion pressure after about 12 to 24 hours, and as shown in FIG. 7, this expansion pressure causes the tongue pieces 21 to break the heat-shrinkable tube 7. Stand with your head facing downwards. Supporting force is imparted to the support pile A by the standing up of the tongue pieces 21 that open downward.

(Effects of the Invention) By injecting and filling the pile body driven into the ground with an expansion agent, a downwardly open tongue piece is formed at the tip of the peripheral wall of the pile body, and the supporting force of the support pile can be increased. Since the heat-shrinkable tube that closes the cut is externally fitted and fixed on the peripheral wall of the pile body, it is possible to prevent dirt and water from entering the pile body and to prevent the expansion efficiency of the expansion agent from being inhibited. Construction is easy, as it is only necessary to drive or bury the straight pipe-shaped pile body into the ground and inject and fill it with an expanding agent, and it does not require many construction machines. The pile body can be mass-produced in a factory, and it is easy to construct, making it economical and easy and quick to construct, with little noise, even in densely populated areas with people's homes and facilities.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention;
FIG. 2 is a perspective view showing the tip of the pile main body, FIG. 3 is a cross-sectional view taken along the line X-X in FIG. 2, and FIGS. 4 and 5 are perspective views showing other embodiments of the closure fitting. Figure 6 is a sectional view showing the support pile driven into the ground, Figure 7
The figure is a sectional view showing a state in which the tongue piece breaks the heat-shrinkable tube and stands up in the ground. A... Support pile, 1... Pile body, 5... Cut, 6
... Closure fitting, 7 ... Heat-shrinkable tube, 8 ...
underground, 9...expansion agent, 21... tongue piece.

Claims (1)

[Claims] 1 A plurality of substantially linear cuts are provided along the axial direction of the outer tube at the tip of the peripheral wall of the outer tube of the pile body consisting of an outer tube and an inner tube, and a closing fitting is installed at the opening at the tip of the pile body. At the same time, a heat-shrinkable tube is fitted and fixed onto the peripheral wall of the outer pipe, the cut made at the tip of the peripheral wall is closed, and the outer pipe and inner pipe are inserted through the opening at the rear end of the pile body. A support pile characterized in that the support pile is configured so that an expansion agent can be injected and filled into the gap formed between the pipes.