JPH0291315A - Pile head reinforcing method for cylindrical stick pile - Google Patents

Abstract

PURPOSE:To manage the reinforcement of a pile head and the treatment of the pile head for fitting the connecting member for a upper structure in one process with insertion of reinforced concrete and improve the efficiency of construction by providing in advance a reinforced concrete structure with upward-projected reinforcement. CONSTITUTION:A reinforced concrete structure 6 to be inserted into the upper end portion of a steel-pipe pile 1 has the reinforcement 8 set to be projected from the end portion located upside in arrangement of insertion when manufac tured in plant. Then, a bottom plate 3 is put on a receiving member 4 attached to the internal face of the steel-pipe pile 1, which is partitioned into a portion 1a to which pile-head reinforcement is applied and a lower portion 1b to inject a preset amount of hardening filler 5 inside the portion 1a. After the reinforced concrete structure 6 is inserted therein and completed with the pile 1 by the filler 5 which is induced in the space of the inner periphery of the pile 1 and the outer periphery of the concrete structure 6, an upper structure 9 is connected with the projected portion 8a of the reinforcement 8.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for reinforcing the pile cap of a cylindrical pile, which involves inserting a reinforced concrete body for reinforcing the pile cap into the upper end of a cylindrical pile installed underground.

[Conventional technology]

Conventionally, when constructing a superstructure to be supported by a tubular pile after reinforcing the pile cap, prior to construction, a member for connecting the superstructure, such as an anchor, is attached to the upper end of the tubular pile itself. A so-called anti-head treatment was required.

[Problem to be solved by the invention]

However, after reinforcing the pile cap at the site, the above-mentioned pile cap treatment must be performed separately.
There was a problem that the on-site construction was complicated and construction efficiency was low.

An object of the present invention is to improve overall field workability, including head treatment, through rational improvements.

[Means to solve the problem]

The characteristic configuration of the method for reinforcing the pile cap of a tubular pile according to the present invention is that in the reinforced concrete body before insertion into the upper end of the tubular pile installed underground, one of the two ends of the reinforced concrete body is inserted into the tubular pile. The reinforcing bars of the reinforced concrete body are made to protrude in advance from the end of the side to be located on the upper side as members for connecting the upper structure, and the functions and effects thereof are as follows.

[For production]

In other words, if a reinforced concrete body with protruding reinforcing bars is inserted into the upper end of an underground cylindrical pile as described above, the pile cap will be reinforced by the reinforced concrete body and the pile cap will be equipped with reinforcing bars as members for connecting the upper structure. Pile head treatment can be done simultaneously in one construction process.

〔Effect of the invention〕

As a result, while the pile caps are sufficiently reinforced, the overall on-site construction including pile cap treatment is simpler than before, and on-site construction efficiency can be improved.

〔Example〕

Next, an example will be described.

Figures 1 and 2 show the state of a driven steel pipe pile (1) (an example of a cylindrical pile) after the pile cap has been reinforced. As shown in b), the ground (2)
The bottom plate (3) is inserted into the steel pipe pile (1) that has been driven into the steel pipe pile (1) as shown in Fig. 3 (0), and the bottom plate (3) is inserted into the receiving member (4) that has been attached to the inner surface of the steel pipe pile (2) in advance. The bottom plate (3) is received, and the inside of the steel pipe pile (1) is divided into a part (1a) at the upper end of the pile where the pile cap is reinforced and a lower part (lb) that remains hollow.
It is partitioned by a bottom plate (3).

After inserting and installing the bottom plate (3), as shown in Figure 3 (c), a predetermined amount of hardening filler (for example, cement milk) (5) is applied.
Then, as shown in Figure 3 (D), pour the reinforced concrete part (6) manufactured in the factory into the part (la) where the pile cap is to be reinforced at the upper end of the pile. Insert it and let it be received by the bottom plate (3).

By inserting the reinforced concrete body (6), the filler (5) wraps around between the inner peripheral surface of the steel pipe pile (1) and the outer peripheral surface of the reinforced concrete body (6), and the filler (5) then hardens. The reinforced concrete part (6) and the steel pipe pile (
1) are integrated, thereby providing great reinforcement strength to the pile cap.

In addition, the steel pipe pile (1) in the part (1a) where the pile cap is reinforced
A large number of protrusions (7) are formed on the inner peripheral surface of the pile, thereby increasing the strength of the connection between the reinforced concrete body (6) and the inner peripheral surface of the steel pipe pile (1) via the filler (5). It is intended to increase the

The above-mentioned ready-made reinforced concrete body (6) to be inserted into the upper end of the steel pipe pile (1) is manufactured at a factory so that the end of the above-mentioned ready-made reinforced concrete body (6) is positioned at the upper side when inserted into the steel pipe pile (1). Rebar (8) of reinforced concrete body (6) from section
The reinforced concrete body (6) is inserted into the upper end of the steel pipe pile (1) to reinforce the head of the bed as described above, and then the upper structure (6) is supported on the steel pipe pile (1). 9), the protruding portion (8a) of the reinforcing bar (8) is used as a connecting member to the upper structure (9).

In other words, as mentioned above, the reinforced concrete body (6) before insertion
By making the reinforcing bars (8) protrude from the pile in advance, the reinforcement of the pile head by inserting the reinforced concrete body (6) and the head treatment for attaching the upper structure connecting member to the upper end of the steel pipe pile (1) can be completed in one step. be able to do so.

In addition, as the ready-made reinforced concrete body (6), reinforcing steel (
A PCI rod is used as the concrete part (8), and the concrete part (
12) a cylindrical PC unit with prestress applied to it;
or PHC units are used, thereby making it possible to obtain extremely high pile cap reinforcement strength.

[Another example]

Next, another example will be listed.

(i) Cylindrical piles are not limited to steel pipe piles, and may be made of any material.

It is also optional to provide protrusions of various shapes on the inner peripheral surface of the cylindrical pile.

(ii) In order to integrate the cylindrical pile (1) and the reinforced concrete body (6) inserted into its upper end, hardening filler (5) was filled in the above example, but As the means, various other means can be used.

(iii) In the above embodiment, a cylindrical PC unit or PHC unit was used as the reinforced concrete body (6), but the specific configuration of the reinforced concrete body (6) can be modified in various ways.

(iv) The protruding portion (8a) of the reinforcing bar (8) that protrudes from the reinforced concrete body (6) may be subjected to thread cutting, bending, etc. in advance.

(V) Protruding reinforcing bars (8a) from the reinforced concrete body (6)
) can be used as a connecting member to construct the upper structure (9) of any type.

Note that although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structures and methods shown in the accompanying drawings.

[Brief explanation of drawings]

1 to 3 show embodiments of the present invention, FIG. 1 is an enlarged sectional view, FIG. 2 is a sectional view taken along line nn in FIG. 1,
Figures 3 (A), (Il+), (C), and (D) are diagrams showing the construction procedure. (1)...Tubular pile, (6)...Reinforced concrete body, (8)...Reinforcement bar.

Claims (1)

[Scope of Claims] A method for reinforcing the pile head of a cylindrical pile by inserting a reinforced concrete body (6) for reinforcing the pile head into the upper end of a cylindrical pile (1) installed underground, the method comprising: reinforcing the reinforced concrete body before insertion. The reinforced concrete body (6) is inserted into the reinforced concrete body (6) from the end of the body (6), which is located on the upper side when inserted into the cylindrical pile (1).
) A pile cap reinforcement method for a cylindrical pile in which the reinforcing bars (8) are made to protrude in advance as members for connecting the upper structure.