JPS6221930A - Method and apparatus for reinforcing pile head - Google Patents

Abstract

PURPOSE:To provide a treatment to give sufficient adhesion and strength for the pile head by a method in which a reinforcing bar cage of a outside diameter large than that of the pile head is combined with a formwork, the formwork is attached to the periphery of the pile head, and concrete is placed. CONSTITUTION:Main reinforcing bar 4 is combined with banded reinforcing bars 5 to form a reinforcing bar cage 2 of a larger outside diameter than that of the pile head. The cage 2 is set in a concrete formwork 3, the formwork 3 is attached to the periphery of the head 11 of a hollow concrete pile 1, and the hollow 11 of the pile 1 is closed by a concrete receiving tray 8. Under the condition, concrete is placed into the spaces between the formwork 3 and the pile head 11, the hollow portion above tray 8, and the footing portion. The pile head having a greater strength than hollow concrete piles can thus be obtained by this treatment.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for reinforcing a pile cap in a hollow concrete pile and a pile cap reinforcing device.

<Prior Art> Various techniques exist for reinforcing the head of a hollow concrete pile.

For example, a technique is used to reinforce the sleeper head by inserting reinforcing bars into the hollow holes of hollow concrete piles and pouring concrete.

Problems to be solved by the present invention> The above technology has the following problems.

(b) During forming, slag always occurs on the concrete surface of the hollow hole of the hollow concrete pile.

For this reason, even if reinforcing bars are inserted into the hollow holes of hollow concrete piles and concrete is poured, sufficient adhesion cannot be expected.

(b) Since the method involves inserting reinforcing bars into the hollow holes of hollow concrete piles, the outer diameter of the reinforcing bars is smaller than the outer diameter of the hollow concrete piles, resulting in low bending resistance.

(c) If the head of a hollow concrete pile is cut off, the prestress at the top of the pile will be released.

Therefore, the bending resistance that the pile body should originally have becomes extremely small, making it impossible to ensure the designed strength.

OBJECTS OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it provides a pillow head for hollow concrete piles that has sufficient adhesion, large bending resistance, and strength greater than that of hollow concrete piles. The purpose is to provide a reinforcement method and a pile cap reinforcement device.

<Example> The present invention is implemented on the following hollow concrete pile 1, and a sleep head reinforcing device as shown in Figs. 2 and 3 is used for the sleep head reinforcement method.

In addition, the sleep head reinforcing device consists of a concrete formwork 3 on a reinforcing bar cage 2.
It is a combination of

(A) Hollow Concrete Pile The hollow concrete pile 1 is a ready-made pile having a hollow hole 11, such as a centrifugal turn stress concrete pile.

(b) Reinforcing bar cage The reinforcing bar cage 2 is a paradigm-shaped cylindrical body in which main reinforcing bars 4 arranged to have an outer diameter larger than the outer diameter of the hollow concrete pile 1 are connected using band reinforcing bars 5, spirals 51, etc. For example, the receiving reinforcing bars 6 are positioned between the main reinforcing bars 4 so that they can be attached to the pile cap of the hollow concrete pile 1.

In this way, the receiving reinforcing bars 6 will be caught on the head of the hollow concrete pile 1 and the position will be fixed, so simply by placing the reinforcing bar cage 2 etc. on the head of the hollow concrete pile 1. Rebar cage 2, etc. is attached to the pile head.

A hanging reinforcing bar 7 or the like is used at the center of the reinforcing bar cage 2, etc., so that the hollow hole 11 of the hollow concrete pile 1 can also be formed.

If the concrete tray 8 is made of flexible plastic or the like, it can be inserted even if it is somewhat larger than the hollow hole 11.

Note that the number of reinforcing bars used for the reinforcing bar cage 2 and the like can be determined according to the reinforcement strength.

Furthermore, various types of reinforcing bars such as deformed steel bars, round steel bars, and steel frames can be used as required, and the location of use is not limited to the outside of the hollow concrete pile 1.

(c) Concrete formwork The concrete formwork 3 is a formwork that is used in combination with the reinforcing bar cage 2, etc. using, for example, stop bars 9, etc., and can be made of sea cucumber board, void board, plastic board, etc. can.

Next, a method for reinforcing the pile cap of the hollow concrete pile 1 will be explained with reference to the drawings.

1> Preparation of pile cap reinforcing device Prepare a pile cap reinforcing device that matches the reinforcement conditions in advance.

The pillow head reinforcement device is made of reinforcing bars i! 2 and a concrete formwork 3, the outer diameter of the reinforcing bar cage 2 is larger than the outer diameter of the hollow concrete shaft 1, and a concrete receiving tray 8 having a diameter almost equal to that of the hollow hole 11 is prepared.

2> Attach the pile head reinforcing device to the head of the hollow concrete pile 1.

Attachment can be easily carried out by inserting the concrete receiving plate 8 into the hollow hole 11 of the hollow concrete pile 1, since the position of the bed head reinforcing device is fixed by the receiving reinforcing bars 6.

3) Concrete pouring After the installation of the sleep head reinforcing device is complete, concrete is poured.

It is also possible to fill soil around the formwork before pouring.

Since the concrete formwork 3 is also combined with the bedhead reinforcing device in advance, once the installation is completed, the formwork is also set at the same time, and concrete can be poured immediately.

4> Completion of reinforcing the pile head of the hollow concrete pile After pouring the concrete, there is no need to dismantle the formwork, and the hollow concrete pile 1 and the poured concrete are integrated, and the head of the hollow concrete pile 1 is reinforced. Reinforcement is complete.

Effects of the Present Invention> Since the present invention is as described above, the following effects can be expected.

(b) It is easy to completely remove impurities such as mud that exist on the outside of hollow concrete piles, and after removing these impurities, the hollow concrete bed head reinforcing device can be installed and concrete can be poured. , sufficient adhesion can be achieved.

Therefore, the horizontal resistance force is large.

(b) Since the dimensions of the footing joint are larger than the outer diameter of the hollow concrete pile, the bending resistance is large.

Moreover, it is also possible to ensure strength greater than that of hollow concrete piles.

(c) The head reinforcing device for hollow concrete piles combines reinforcing steel and concrete formwork, so concrete can be poured just by attaching it to the hollow concrete pile, and there is no need to dismantle the formwork. do not have.

Therefore, no skilled labor or special machinery is required, and the construction is easy. By setting this device up to this point, it can be integrated with the pile and provide sufficient reinforcement.

[Brief explanation of the drawing]

Figure 1: Detailed explanatory diagram of the present invention Figures 2 and 3: Explanatory diagram of the hollow concrete pile cap reinforcing device of the present invention Figure 1: Hollow concrete pile 2: Reinforcement capacity 3: Concrete formwork 4: Main reinforcing bar 6: Receiving reinforcing bar 1st
figure

Claims (2)

[Claims] (1) Pile cap reinforcement method in which a concrete formwork is combined with a reinforcing bar cage having an outer diameter larger than the outer diameter of the pile cap of a hollow concrete pile, attached to the pile cap of a hollow concrete pile, and concrete is poured. (2) A pile cap reinforcement device that combines a concrete formwork with a reinforcing bar cage that has an outer diameter larger than the outer diameter of the pile cap of a hollow concrete pile.