JPS6146609B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a pile head reinforcement method for increasing the horizontal strength of foundation piles.

(Problems of the prior art to be solved by the invention) Conventionally, the pile diameter plus 250 to 300 mm was placed concentrically with the pile head.
Concrete is placed between the steel pipe and the piles after placing steel pipes with a diameter of approximately I was unable to avoid the problem of not being able to insert the .

(Object of the Invention) The present invention was devised in order to solve the above-mentioned conventional problems, and an object of the present invention is to make it easy and reliable to insert a reinforcing bar cage.

(Embodiment) Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 5. In FIG. A ring-shaped tip shoe 3 having a sloped surface 2 that recedes upward is attached, and a spacer 4 is attached to the upper outer periphery. 5 is an outer steel pipe shorter than inner steel pipe 1,
It is arranged concentrically with the inner steel pipe 1 by a tip shoe 3 and a spacer 4. The lower end of the outer steel pipe 5 is in sliding contact with the outer peripheral surface of the tip shoe 3, and the lower ends of the inner and outer steel tubes 1 and 5 are closed by the tip shoe 3. Further, a hammer receiver 6 is attached to the upper ends of the inner and outer steel pipes 1 and 5.

In this invention, after driving the pile 7, the inner steel pipe 1 of the double pipe is fitted to the pile 7, and the double pipe is struck by a diesel hammer or the like (not shown) through the hammer receiver 6. As a result, it is lowered through the inner steel pipe 1 using the pile 7 as a guide, and placed at the head of the pile 7 (see FIGS. 1 and 2). Next, the hammer receiver 6 is removed and the double inner steel pipe 1 is pulled out using the pile 7 as a guide (see FIG. 3). A pile cap characterized in that a reinforcing bar cage 8 is inserted into the reinforcement space thus formed (between the outer steel pipe 5 and the pile 7), and then concrete 9 is poured (see Figs. 4 and 5). This is a partial reinforcement method.

In addition, the descending arrangement of the double pipe is not based on impact press-fitting.
A plurality of inclined blades are radially attached to the lower end of the inner steel pipe 1 and recede upward as they move outward in the radial direction, and by rotating the inclined blades through the inner steel pipe 1 and pushing the inner steel pipe 1. Good too.

In addition, when the pile head is placed below the construction ground surface, the outer steel pipe 5 is divided into upper and lower outer steel pipes 5A, 5B, and both upper and lower outer steel pipes 5A, 5B are connected by a male and female joint 10. Then, as shown in FIGS. 6 to 10, concrete was poured up to the connection point of the upper and lower outer steel pipes 5A and 5B using the same process as in the previous embodiment, and then the area around the upper outer steel pipe 5A was poured. The ground is excavated and the upper outer steel pipe 5A is lifted and removed, and then the head of the pile 7 is cut and removed (see Fig. 11). Next, the reinforcing bars 11 are placed, and the formwork 1
2, a footing concrete 13 is poured into the formwork 12 (see FIG. 12). The steel column 14 is assembled by anchoring to this footing concrete 13 (see Fig. 13).

In addition, after enclosing with corrugated plate, wire mesh, etc. and inserting the reinforcing bar cage 8,
Pull out the outer steel pipes 5, 5A, 5B and concrete 9
It is also possible to cast.

(Effects of the Invention) As described above, the present invention allows a double pipe consisting of an inner pipe and an outer pipe to be fitted onto an existing pile using the inner pipe, and to be lowered and placed on the head of the pile. can be placed concentrically. Since the inner tube, which is equipped with a tip shoe, spacer, etc. that maintains a constant distance between the outer tube and the pile, is pulled out, the reinforcing bar cage can be easily and reliably inserted between the outer tube and the pile. Since the concrete is poured while the outer tube prevents the wall from collapsing, earth and sand will not enter the outer tube, and strong reinforced concrete that is integrated with the outer tube can be formed at the pile head.

Therefore, according to the present invention, the inner pipe can be used repeatedly to perform construction easily and quickly, and the reinforcing effect of the pile head can be improved compared to the conventional method.

[Brief explanation of the drawing]

Figures 1, 2, 3, 4 and 5 are process diagrams showing an embodiment of the present invention, and Figures 6 and 7 are
Fig. 8, Fig. 9, Fig. 10, Fig. 11, Fig. 1
2 and 13 are process diagrams showing other embodiments of this invention. 1... Inner steel pipe, 3... Tip shoe (gradient surface 2), 4... Spacer, 5... Outer steel pipe, 5A...
Upper outer steel pipe, 5B...Lower outer steel pipe, 6...Hammer receiver, 7...Pile, 8...Reinforcement cage, 9...Concrete, 10...Male and female joint, 11...Reinforcement bar, 12...
...Formwork, 13...Footing concrete, 14
...Steel column.

Claims (1)

[Claims] 1. A double pipe, in which the distance between the inner and outer pipes is maintained constant by a spacer provided on the inner pipe, a tip shoe, etc., is fitted onto an existing pile using the inner pipe and guided down, and then placed at the head of the pile. After placement, pull out the inner tube. Then,
A pile head reinforcement method characterized by inserting and arranging a reinforcing bar cage between the outer pipe and the pile, and then pouring concrete.