JPH0749714B2 - Steel tube concrete pillar construction method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an improvement in a steel pipe concrete construction method for producing a concrete structure.

In the present application, the term "concrete" is used to mean either a cement, gravel, sand, or other kneaded product with water in an uncured fluid state, or a cured molded product thereof.

2. Description of the Related Art At present, when building a building or a bridge, a concrete formwork is used to construct a hollow part such as a wall surface, a pillar, or a bridge pier according to its shape, and concrete is poured into the hollow part to obtain a desired shape. When making a concrete structure, when the height of the structure exceeds a certain level, when concrete is dropped from the top of the constructed formwork and injected, aggregates in the concrete are unevenly distributed. As a result, a concrete structure with uniform strength cannot be obtained.

In particular, in the case of filling the concrete in the hollow steel pipe by the steel pipe concrete method and hardening it to make the pillar of the building,
In addition to the uneven distribution phenomenon of the aggregate, there is a drawback that it hardens while entraining air, resulting in voids.

For example, when the hollow steel pipe 20 of FIG. 2 is filled with concrete, the injection hole 22 for the primary casting is further provided at the height of the second floor 25 which is about 3000 mm above the first floor 24. The injection hole 23 for the third placing is formed on it in order, and in advance,
Unwind the concrete delivery hose 29 of the concrete pumping car 28, first pour concrete from the pouring hole 21,
A second pouring is performed by pouring to the height of the pouring hole and hardening it, and then pouring concrete into the pouring hole 22 in accordance with the concrete pouring on the floor of the third floor. In this way, the method of repeatedly laying the floors up and down is repeated.

However, when placing into a steel pipe with a cross section of a square with a side of about 500 mm, be careful not to create voids in the filled concrete or uneven distribution of aggregate, It is not possible to rework with, and moreover, like ordinary mold molding, when you remove the mold, you can find a void, and do the primary casting and the secondary casting. It is not possible to visually check the condition of joints.

Such a situation has become an issue to be solved promptly in the steel pipe concrete construction method in recent years when high precision is required for the strength of columns and beams with the increase in the number of buildings.

Further, in the conventional steel pipe concrete construction method, when a steel pipe concrete column is constructed, concrete is dropped and filled into the erected steel pipe by its own weight,
If you make a protrusion that protrudes inward at the seam of the steel pipe, the flow of concrete will be obstructed and a void will occur, so
When joining the steel pipe and the beam, as shown in FIG. 4, flange-like joining edges 41, ... Are provided laterally on the outer peripheral surface of the steel pipe 40, and the ends of the beams on each floor are bolted to this. It is performed by the so-called outer diaphragm plate method of joining.
However, since the joining edge is formed by welding, it is attached in a state in which the outer circumference of the steel pipe is surrounded by four pieces of steel material.
42, ..., 43, ... become complicated and require a high degree of skill, and there is a drawback that the manufacturing cost of the steel pipe concrete column occupies a large specific weight.

OBJECT OF THE INVENTION The present invention has been made in view of such circumstances, and the construction of a steel pipe concrete column extending over a plurality of floors is carried out in a single process promptly and without producing voids inside. It is an object of the present invention to disclose a method of constructing a steel pipe concrete column which can be formed at a low cost and can also form a beam joint.

Configuration of the Invention A construction method according to the present invention has a plurality of steel pipes, and upper and lower plates whose peripheral portions project laterally from the outer peripheral surface of the steel pipes as connecting portions with beams on each floor of a multi-story building to be constructed. A series of steel pipes that are connected to each other through a box-like joint, and the plurality of connected steel pipes are connected to each other through concrete passage holes formed in the upper and lower plates of the joint, respectively. A pillar is erected, and a concrete pressure inlet is provided at the bottom of the bottom floor of the steel pipe pillar.
A plurality of stories, characterized in that the outlet of a concrete pumping device is connected to the pressure inlet through a concrete backflow prevention means, and concrete is press-fitted in one step upward from the lower part of the steel pipe column. It is in the construction method of steel pipe concrete columns. Hereinafter, a detailed description will be given based on one embodiment.

Example FIG. 1 shows a square cross section with a side of 400 mm and a thickness of 12 m.
The figure shows the case of pouring concrete into a series of steel pipes with a total length of about 15 m and a pillar of a five-story building, which is a steel pipe 31 that will be the pillar of a building on the first floor. The steel pipe 32, which is the pillar on the second floor, has a structure in which it is integrally connected as a series of steel pipes by a box-shaped joint 36. Needless to say, the steel pipe 32 to be the pillar of the third floor (not shown) is integrally connected to the upper end of the steel pipe 32 to be the pillar of the second floor via a similar joint 36. The box-shaped joint 36, as shown in FIG. 3, has the same cross-section of the steel pipes 31, 32 between the upper plate 33 and the lower plate 34 having an area larger than the cross-sectional area of the steel pipes 31, 32. A steel pipe 35 having a height substantially the same as the height of the beam 8 to be joined is provided, and the joining portion is welded and integrated. Reference numeral 33a is a concrete passage hole formed in each of the upper and lower plates 33 and 34, and the protruding portions of the upper and lower plates from the outer peripheral surface of the steel pipes 31 and 32 to the sides serve as the joints with the beam 8.

Opening 3 at the bottom of steel pipe 31 and slightly above floor 2 on the first floor
Is provided, and the flange joint member 4 is fixed to this to form a concrete pressure inlet. Through the sluice valve 5 as a concrete backflow prevention means, the tip end 7a of the hose 7 of the concrete pumping vehicle 6 that is currently generally used as a concrete pumping device is used as a delivery port to the flange joint member 4, and bolts, nuts, etc. Connect by fixing with the fixture of. Next, concrete is poured from the pumping device 6 into the steel pipe 31 with the sluice valve opened, and the upper end of a series of steel pipes connected via a box-shaped joint is filled in one step. When the filling is completed, the sluice valve 5 is closed, the hose 7 is removed, and the concrete is hardened. Thus, in a single operation, there can be obtained a column made of a homogenous concrete steel pipe in which the concrete is seamless and has no voids or uneven distribution of aggregate.

In the above embodiments, an on-off valve such as a sluice valve was used as the concrete backflow prevention means, but this may be filled with a check valve or a suitable filling material into the pressure inlet after the concrete is poured. .

Effect In the conventional steel pipe concrete construction method, in order to fill the concrete into the steel pipe, it was impossible to fill the concrete into the steel pipe unless a series of hollow straight pipes without protrusions were used. , The connection between the beam and steel pipe on each floor is
The expensive grunge joint 41 was fitted on the outside, and the joint 41 was used to perform the so-called outer diaphragm plate construction method. By using an inexpensive box-like joint with a passage hole, the liquid concrete is raised from below by the injection pressure, so that air is not trapped and there is no gap in the corners of the upper and lower plates of the joint 36. It is possible to construct a steel pipe concrete column made by integrating steel pipe and concrete in a single process in a homogeneous and uniform strength state, thereby significantly saving the construction period and construction cost. it can.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a method of implementing the present invention. FIG. 2 is an explanatory diagram showing a conventional method. FIG. 3 is an explanatory view showing the detailed structure of the joint used in the method of the present application. FIG. 4 is an explanatory view showing an example of a beam joint used for a conventional steel pipe concrete column.

Claims (1)

[Claims] 1. A box-shaped joint having a plurality of steel pipes as upper and lower plates whose lateral edges project laterally from the outer peripheral surface of the steel pipes as connecting portions with beams on each floor of a multi-story building to be constructed. Integrally connected, each of the plurality of connected steel pipes, standing up a series of steel pipe columns that communicate with each other by communicating with each other through the concrete passage holes formed in the upper and lower plates of the joint respectively, A concrete pressure inlet is provided at the bottom of the lowermost part of the steel pipe column, and at the pressure inlet,
The outlet of the concrete pumping device is connected through a concrete backflow prevention means, and the concrete is press-filled in one step upward from the lower part of the steel pipe column, which is made of steel pipe concrete over a plurality of floors. Pillar construction method.