JPS5835708Y2 - Head reinforced concrete pile - Google Patents

Description

[Detailed description of the invention] The invention relates to a head-reinforcing pile in which a steel pipe is integrally attached to the head of a ready-made concrete pile. Concerning a head-reinforced concrete pile in which the head of a prefabricated concrete pile is coated with the following, and expanded mortar is injected and hardened between the head of the pile and the steel pipe to integrally constitute the head of the pile and the steel pipe. It is.

When conventional prefabricated concrete piles are cut off after being driven, cracks occur below the cut point, which significantly weakens the strength of the pile and strengthens the connection between the pile and the building built on top of it. There were disadvantages such as difficulty in

Recently, in order to improve this conventional drawback, synthetic piles have been developed, for example, as shown in Japanese Utility Model Application No. 53-22501. In addition, the coagulant injected between the concrete pile and the steel pipe will flow down the hole from between the two, making it difficult to join them together sufficiently. There were drawbacks such as the inability to do so.

The pile according to the present invention is related to a completely new technology that fundamentally improves the drawbacks of the conventional technology.

To specifically explain one embodiment of the pile according to the present invention with reference to figures, in Figs. It is a steel pipe having a diameter that allows a sufficient gap to be formed between it and the pile 1, and a flange 3 is provided at the lower end of the pipe to project inward in the shape of a brim.
The inner diameter of the flange 3 is approximately equal to the outer diameter of the concrete pile 1, and the flange 3 forms a perforated bottomed pipe as a whole.

Reference numeral 4 denotes expansion mortar filled between the pile 1 and the steel pipe 2, and the binding force of the expansion mortar 4 allows the pile 1 and the steel pipe 2 to be integrally connected.

As mentioned above, the pile according to the present invention has a flange at the lower end of the steel pipe that covers the head of the pile, and the inner diameter of this flange is in close contact with the pile, so when the steel pipe is lowered, there is dirt between the steel pipe and the pile. There is no risk of intrusion, etc., and even when expanded mortar is injected between the steel pipe and the pile, there is no risk of the mortar flowing out from the bottom of the steel pipe. Therefore, the space between the steel pipe and the pile can be completely buried. Furthermore, since the flange at the bottom of the steel pipe comes into contact with the outer periphery of the pile, the distance between the steel pipe and the pile can be maintained evenly in any position, front, back, left, or right. Since the steel pipe and the top end of the pile are completely integrated, there is no risk of cracking in the subsequent pile head even if the upper end of the pile head is removed. Moreover, this steel pipe can be integrally welded to the anchor of the building's foundation, and these operations can be performed at the same time as ready-made piles are being driven. It is.

[Brief explanation of drawings]

FIG. 1 is a side view of the head of the pile of the present application, and FIG. 2 is a partially cutaway explanatory view thereof. 1: Pile, 2: Steel pipe, 3: Flange, 4: Expanded mortar.

Claims (1)

[Scope of utility model registration request] A steel pipe 2 having a flange 3 whose inner diameter is approximately equal to the outer diameter of the ready-made concrete pile 1 protrudes from the inside of the lower end covers the head of the ready-made concrete pile 1, and an expanding mortar 4 is placed between the steel pile 1 and the steel pipe 2. This head-reinforced concrete pile is made by integrally constructing the head of a pile 1 and a steel pipe 2 by injection hardening.