JPH11269990A - Structure of steel pipe for filling concrete - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure of a steel pipe for filing concrete, enabling the concrete to be completely filled to the peripheral edge of the lower surface of a diaphragm by use of a simple structure. SOLUTION: In a steel pipe 1 into which pressurized concrete is filled from below, a surface plate serving as a diaphragm 2 is installed in the mid part of the steel pipe 1 along a direction crossing the direction of the axis of the steel pipe 1, and a concrete circulation hole 3 is bored in the diaphragm 2. An expansion-stopping cylinder 5 is installed throughout the periphery of the upper part of the circulation hole 3 in such a way as to surround the circulation hole 3. Further, air vents 4 are bored in the diaphragm 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a structure of a steel pipe for filling concrete.

[0002]

2. Description of the Related Art An ordinary concrete structure is constructed by pouring concrete from above and hardening it after assembling a formwork. However, in the case of a vertically long form such as a steel pipe column, when concrete is poured from above, the concrete falls a long distance, so that aggregate and mortar are separated. In order to avoid such separation, use a construction method in which pressurized concrete is press-fitted from below into steel pipes, or use a tremy tube, pour concrete from above, and gradually bury the tip in the concrete. And concrete filling.

[0003]

However, the conventional method described above has the following problems. <A> As shown in FIG. 4, a face plate is installed inside the steel pipe a as a diaphragm b in a direction crossing the axial direction of the steel pipe a for reinforcement. Therefore concrete c
In order to fill the opening, a concrete circulation port d is opened at the center of the diaphragm b, and an air vent hole e is opened around the periphery. Then, the concrete c that has risen from below the diaphragm b should arrive at the circulation port d and the air vent hole e at the same time, and be filled in the upper space of the diaphragm b. <B> Actually, however, the concrete c rising from below does not rise evenly in a flat state because of the resistance of the inner surface of the steel pipe a, and is circulated first in a state where the central portion is raised. Reach the mouth d. When the preceding concrete c at the central portion gets out of the distribution port d, the concrete c immediately expands and spreads on the upper surface of the diaphragm b. Therefore, before the rising concrete c reaches the air vent hole e, the concrete c may block the air vent hole e from above. <C> If the unfolded concrete c blocks the air vent hole e first, there is no place for air to escape on the lower surface of the diaphragm b. As a result, of the ascending concrete c, in particular, the surrounding concrete c cannot reach the periphery of the lower surface of the diaphragm b, and the unfilled space of the concrete c is generated at the periphery of the lower surface of the diaphragm b. Would. <D> The above problems also occur when the concrete is pushed up from below while filling the tremy tube and filling.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and has a simple structure and is capable of completely filling the peripheral portion of the lower surface of the diaphragm with concrete. The purpose is to provide a structure.

[0005]

In order to achieve the above object, the structure of a steel pipe for concrete filling according to the present invention is a steel pipe for filling pressurized concrete from below by filling the inside of the steel pipe. In the direction transverse to the axial direction of the steel pipe, install a face plate as a diaphragm,
In this diaphragm, a concrete circulation port is opened, and in a state surrounding the circulation port, a deployment blocking cylinder is installed around the entire upper part of the circulation port, and further, an air vent hole is opened in the diaphragm. It features the structure of steel pipe for filling concrete.

[0006]

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

<A> Installation of a diaphragm. As described above, in the steel pipe 1 in which the pressurized concrete is filled from below, the face plate as the diaphragm 2 is provided in the middle of the steel pipe 1 in a direction crossing the axial direction. This steel pipe 1 can adopt the structure of the present invention regardless of whether its cross section is circular or its cross section is rectangular or polygonal. Diaphragm 2 may be configured to protrude in a flange shape only inside steel pipe 1 or may be a plate protruding to the outside. The diaphragm 2 has a concrete opening 3 substantially at the center and an air vent 4 around the opening.

<B> A deployment blocking cylinder. Around the flow opening 3, a deployment prevention cylinder 5 is provided above the diaphragm 2. For example, a low-height cylinder obtained by cutting a steel pipe having an inner diameter larger than the inner diameter of the distribution port 3 into a circle can be used as the deployment prevention cylinder 5. This blocking cylinder 5
Is easily fixed to the upper surface of the diaphragm 2 by spot welding or the like. The blocking cylinder 5 only needs to be able to prevent the free development of the concrete, so that there is no problem even if there is a slight gap in the portion to be attached to the diaphragm 2, and therefore simple welding is sufficient. In addition, since no large external force acts on the blocking cylinder 5, a thin product having a small thickness can be used.

<C> Description of concrete filling work. The concrete 6 rises from the lower stage of the diaphragm 2, and the central portion reaches the distribution port 3 first. (FIG. 2) Then, though passing through the distribution port 3, a blocking cylinder 5 is installed around it. Therefore, the concrete 6 cannot be spread toward the periphery of the upper surface of the diaphragm 2 immediately after passing, but only rises inside the blocking cylinder 5. During the rising time of the concrete inside the blocking cylinder 5, the concrete 6 at the lower stage of the diaphragm 2 keeps rising. When the concrete 6 is exposed from the surrounding air vent 4, the concrete 6 that has continued to rise inside the blocking cylinder 5 also overflows from the upper end to the periphery and spreads on the upper surface of the diaphragm 2. (Fig. 3)

[0010]

The structure of the concrete filling steel pipe 1 of the present invention is as described above, and the following effects can be obtained. <A> As the concrete 6 rises inside the blocking cylinder 5, the passage time of the concrete 6 through the distribution port 3 can be delayed. Meanwhile, the concrete 6 at the lower stage of the diaphragm 2 continues to rise and the surrounding air vent holes 4
From the upper surface of the diaphragm 2. Therefore, the phenomenon that the concrete 6 that has passed through the distribution port 3 beforehand spreads widely on the upper surface of the diaphragm 2 and closes the air vent hole 4 does not occur. as a result,
The concrete 6 in the lower peripheral portion also reaches the periphery of the lower surface of the diaphragm 2, and the peripheral portion of the lower surface of the diaphragm 2 can be completely filled with the concrete 6. <B> Moreover, in order to achieve such a function, it is sufficient to simply weld a cylinder 5 formed by cutting a thin steel pipe into a ring, for example, which is extremely economical. <C> In addition to the method of press-fitting concrete from below the steel pipe, using a tremy pipe, pouring concrete from the upper end, gradually pulling up the lower end while buried in the concrete, and pushing up the concrete from below, the tremy pipe method Can be similarly used.

[Brief description of the drawings]

FIG. 1 is a cutaway perspective view of a concrete filling steel pipe according to an embodiment of the present invention.

FIG. 2 is an explanatory view during filling of a steel pipe for concrete filling 1 of the present invention.

FIG. 3 is an explanatory view of a state where concrete has passed through a distribution port.

FIG. 4 is an explanatory view of a conventional structure.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Koji Harada, Inventor 1-7-1, Maizuru-cho, Oita City, Oita Prefecture Inside Sato Benec Co., Ltd. (72) Inventor Shiro Watanabe 1-7-1, Maizuru-cho, Oita City, Oita City, Oita Prefecture Sato Benec Co., Ltd.

Claims (4)

[Claims] Claims: 1. A steel pipe for filling a pressurized concrete from below by filling it up from below, wherein a face plate as a diaphragm is installed in the middle of the steel pipe in a direction crossing the axial direction of the steel pipe, and a concrete distribution plate is provided on the diaphragm. The structure of the steel pipe for concrete filling, with the opening and the surrounding of this distribution port, with a deployment prevention cylinder installed around the entire upper part of the distribution port, and with an air vent hole opened in the diaphragm 2. The structure of a concrete filling steel pipe according to claim 1, wherein the undeployment cylinder is a low-height cylinder formed by cutting a steel pipe having an inner diameter larger than the inner diameter of the distribution port. 3. The structure of a concrete filling steel pipe according to claim 1, wherein the steel pipe has a circular cross section. 4. The structure of a concrete filling steel pipe according to claim 1, wherein the steel pipe has a rectangular cross section.