JPS62178623A - Settling work for concrete pile - Google Patents

Abstract

PURPOSE:To control the distortion of a concrete pile to minimum by a method in which a swing-inhibitor is loosely inserted into the lever of a rotary shaft inserted with both hollow and propulsive piles to be connected, having an angular block, and then fixed to the upper part of the hollow pile. CONSTITUTION:A propulsive pile 1 is connected to the tip of a hollow pipe 2, and a rotary shaft B with an angular block 17 is inserted into the piles 1 and 2. A swing-inhibitor 18 is loosely inserted into the lever 16 of the shaft B in contact with the hollow 2a of the pile 2 and fixed to the upper part of the pile 2. The shaft B is turned and the rotation of the shaft B is transmitted to the lower end of the pile 1, during which period the piles 1 and 2 are settled. The rotation of the auger is given through the shaft B to the pile 1, and therefore, the application of twisting movement to the whole piles can be almost avoided.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a method for sinking concrete piles that allows for noise-free, vibration-free, and efficient sinking work.

[Conventional technology] Conventionally, in order to sink concrete piles into the ground without noise or vibration, the general method was to use a drill to drill a hole, and then insert the concrete pile into the hole by suspending it. However, if there is excavated earth and sand in the hole, the concrete pile will not be inserted to the specified depth due to its own weight alone, so the concrete pile will not be inserted properly. Press-fitting is performed while applying rotation f to part f1. However, with this method, when the quality of the concrete pile increases, the rotational force of the pile head becomes difficult to be transmitted to the bottom end of the pile due to the frictional force of the soil, which limits the amount of sinking. There is a risk that a large torsional moment will act on the pile and the pile will be cut.

``Problems to be Solved by the Invention: 50; 1 Therefore, the present inventors, in order to solve the problem of
As shown in Publication No. 0-59226, a propulsion pile with a spiral plaid protruding from the outer periphery is connected to the tip of the hollow pile, and the rotational force of the rotating shaft is transferred between the square hole of the propulsion pile and the base end of the hollow pile. Attached to! The company proposed a construction method in which the piles are pressed in while the pile is pressed in.

According to this construction method, since the rotational force is transmitted to both the tip and base of the pile, the torsion moment acting on the pile is greatly reduced. However, as a result of further research, it was discovered that there were points that needed to be further improved with this construction method. In other words, the end of the pile like in the same method? If a rotational force is applied to the base end of the pile, distortion will occur due to the torsional moment of the rotating shaft, so the rotational force of the shaft will be applied from the base end of the pile and then to the tip. A torsional moment is also generated in the pile, which is not desirable, and the engagement between the base end of the pile and the rotating shaft 8! There are problems in that the structure is complicated and the work is troublesome.

The present invention solves these problems, minimizes the torsional moment acting on the pile when it is sunk, and allows the work to be done simply and efficiently, reducing construction costs. 9 [Means for Solving the Problems] The structure of the present invention will be explained with reference to the drawings focusing on a breeding example. Screws on the outer periphery
A propulsion pile 1 having protruding wings 5 and a fitting hole 6 with a rectangular cross section formed in the center is connected, and both connected piles 1,
2, a rotary shaft 7)B having a square block 17 of a shape corresponding to the fitting hole at the lower end is inserted, and the shaft 16 of the rotary shirt) B is inserted into the hollow part 2a of the hollow pile 2. A vibration damping body 18 having an outer diameter that allows internal movement is loosely inserted, the vibration damping body 18 is positioned and fixed at the upper end of the hollow pile 2, and this rotating shaft B is rotated to transfer its rotational force to the pile. The lower end of the
It is a sign.

"(Function)" In the construction method of the present invention, the rotational force of - is applied to the propulsion pile 1 via the rotating shirt)B. That is, the pile to be sunk will be rotated by the rotational force at its lower end. Therefore, the lower end of the pile, which is subject to the greatest resistance, is directly rotated due to the notch into the ground made by the screw 7i2 blade 5 and the ground. Therefore, almost no torsional moment acts on the entire pile, and the pile can be easily and efficiently sunk.

"Embodiments" Examples of the present invention will be described below with reference to the drawings.

In the construction method of the present invention, a concrete pile A as shown in FIGS. 2 and 3 is used.

The concrete pile A consists of a propulsion pile 1 and a hollow pile 2. In the propulsion pile 1, the outer periphery of the concrete pile main body 3 is covered with a protective iron plate 4, and one to several turns of spiral wings 5 are protruded along the outer periphery. A fitting hole 6 is formed, and a protective iron plate 7 is attached to the inner surface of the fitting hole 60. In addition, the hollow pile 2, which has an end plate 8 fr (provided with a sufficient thickness on the outer periphery of the proximal end) and has reinforcing bars 9, 9 fixed thereto and extends into the main body 1, is generally used. Although it is not necessary to explain it in detail since it is a well-known structure, a hollow concrete wood block 10 is provided with an annular seat plate 11.11 and a reinforcing ring 12.12 at both ends thereof. In the concrete body IO, there is a shaft reinforcing bar 1 with both ends attached to each seat plate 11, 11.
3+13 and V7-p muscle 14 are buried. The propulsion pile 1 and the hollow pile 2 are fixed by welding 15 at the outer peripheral edges of their end plates 8 and seat plates 11.

Fig. fjS4 shows the rotary shirt (B) used for sinking the concrete pile 8 mentioned above, and the tip of the shaft rod 16, which is formed into a shape, has a rectangular shape that engages with the fitting hole 6 of the propulsion pile 1. A block 17 is provided, and the shaft rod 110 has an outer diameter that allows it to move inwardly in the hollow portion 2a of the hollow pile 2.

A steady rest IS having a tapered lower part is inserted loosely through its center hole 19, and is provided so as to be able to freely slide along the shaft rod 16. Between the body 18 and the square pro/reel 17 (positioned here, swing 1
A stop ring 20 restricts the descent of the retainer 18 from the shaft 16.
For example, it can be attached with screws 19 at any point in the direction of the mounting (this is loosely fitted).

An auger joint (not shown) is provided at the upper end of the shaft 6.

Next, construction examples using the construction method of the present invention will be explained. First, eight concrete piles will be erected above ground. With,
As shown in FIG. 1, insert the rotary shaft B into the pile A, engage the square block 17 with the fitting hole 6, and insert the shaft rod 1.
6) Auger joint at one end (not shown)
is connected to the drive shaft (not shown) of the tower for pile sinking. Further, the steady stop IS is positioned near the upper end of the hollow pile 2, and the stop ring 20 is fixed by tightening the screw 19 just below the bottom end of the steady stop 18, and the steady ring 20 supports the steady stop 18. . So 1σ1・bosha7)
When B is made Ir1l''lf, the rotational force is transmitted to the propulsion pile 1, and the excavation proceeds by the spiral blade 5,
Pyle will become a sage underground as shown in Part 1.

If this Hunkrete pile is to be sunk deeper as a further decoration, another hollow concrete pile is welded to one end of the hollow Hunkrete pile A, and
The rotating shaft 13X is added, and the steadying body 18 is moved in two directions, positioned at the upper end of the new pile that has been tied, and supported by the retaining ring 20 in the same manner as described above. , just rotate the rotary shaft 7)B again.

After the pile has been laid down, all that is required is to uncouple the drive shaft from the blade and pull out the rotary shaft B upward.

“Effects of the Invention J As explained above, the present invention provides the following advantages:
A propulsion pile with spiral blades protruding from the outer periphery and a fitting hole with a rectangular cross section formed in the center is connected to the propulsion pile, and a square block having a shape corresponding to the fitting hole at the lower end is connected to the connected pile. By inserting a υ1-rotating shaft with The pile can be sunk without vibration, and since the rotational force is applied to the lower end of the pile where the most resistance is applied, no torsion moment is applied to the pile and there is no risk of damage to the pile (for long piles). Pile laying can be carried out easily and efficiently.Furthermore, the rotating shaft is provided with a vibration damper that can freely move, and when the pile is lowered, it is fixed within the upper end of the pile, so that the rotating shaft does not swing. Unloading is carried out accurately and construction can be carried out smoothly. Moreover, since the upper end of the pile is blocked by a steadying body, it is possible to prevent earth and sand from entering the pile during laying, and the laying work can be carried out without any problems. It has many advantages such as good performance.

1 Brief explanation of the drawings 1 Fig. 1 is a side sectional view showing the state of concrete piles being deposited according to the construction method of the present invention, Fig. 2 is a side sectional view of the concrete pile used in the present invention, Fig. 3 is a plan view of the same, Fourth
The figure is a side sectional view of the rotating shaft.

A... Concrete pile B... Rotating shaft... Propulsion pile 2... Hollow pile 5... Spiral blade 6... Fitting hole 16... Axial rod
17... Square block 18... Steady stop body
20...Retaining ring Fig. 1 Fig. 2 Fig. 3 Fig. 4

Claims (1)

[Claims] At the tip of the hollow pile, a propulsion pile with spiral blades protruding from the outer periphery and a fitting hole with a square cross section in the center is connected,
A rotary shaft having a rectangular block with a shape corresponding to the former fitting hole is inserted into the lower end of the connected piles, and the shaft of the rotary shaft is movable internally in the hollow part of the hollow pile. A steady resting body having an outer diameter is loosely inserted, the steady resting body is positioned and fixed at the upper end of the hollow pile, and the pile is sunk while rotating this rotating shaft and applying its rotational force to the lower end of the pile. A concrete pile sinking method that is characterized by: