JPH05272240A - Concrete placing method for packed steel tube concrete column - Google Patents

Abstract

PURPOSE:To raise the reliability of structure of a packed steel tube concrete column by a method in which concrete is densely placed into the packed steel tube concrete column to form uniform concrete structure. CONSTITUTION:A concrete-packing tube 4 extending from the top to the tower joint bottom or a steer tube 1 in a packed steer tube concrete column is inserted along the axis of the column. Concrete P is packed at a rate matching the charging amount of concrete from the tube 4 through the tube 4 from a concrete hopper 5 connected to the top of the steel tube column.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete pouring method for a filled steel tube concrete column for densely pouring internal concrete of the column in the filled steel tube concrete column.

[0002]

2. Description of the Related Art Conventionally, steel pipe concrete columns are installed on multiple floors.
It is configured to be joined as a node to the pillar-beam joints of each floor via a diaphragm. For the placement of the pillar concrete in the steel pipe concrete pillar, a steel pipe pillar having a plurality of stories as a node is arranged at a predetermined position and a tremie pipe is inserted from the top, and the diaphragm at each of the floor pillars and beam joints is penetrated. The tremie pipes were made to reach below the steel pipe columns, and the tip of the tremie pipes was always embedded in the concrete to keep the concrete spraying into the steel pipe columns, and the concrete was poured while gradually pulling up the tremie pipes.

[0003]

As described above, a plurality of floors
In the method of placing concrete by inserting a tremie pipe into a steel tube column as a node, first, (a) a steel tube column having multiple stories as one node usually has three stories as one node column. When the length is around 12 m and concrete inflows from the top of the steel pipe column, it intermittently falls below the steel pipe column at the tip of the tremie pipe, causing aggregate separation of the concrete and re-injecting concrete from the tip. Kneaded,
At this time, since air is also driven in while being entrained, it becomes coarse and dense and concrete cannot be poured uniformly. In this case, too much vibrator is used to impair the uniformity of concrete. (B) Furthermore, since the state of concrete being sprayed into the steel pipe is maintained and the tremie pipe is gradually pulled up, it is necessary to constantly raise the height while monitoring its height, and the pulling work is complicated. (C) Furthermore, in the diaphragm of the middle joint of the steel pipe column and the beam joint, there is an air hole outside the through hole of the tremie pipe in the horizontal partition wall. May be retained or voids may be generated due to the subsidence of concrete, and a defective portion may be formed in terms of strength, so that the desired strength cannot be exhibited.

The present invention has been proposed in view of the above-mentioned problems of the prior art. The object of the present invention is to solidly cast the concrete inside the steel pipe column so that the quality of the cast concrete is made uniform. , Provides a structurally reliable method for placing concrete in filled steel pipe concrete columns.

[0005]

In order to achieve the above object, according to the concrete placing method of the filled steel pipe concrete column according to the present invention, in the filled steel pipe concrete column, from the top of the column to the bottom of the lower joint part. Insert a concrete loading pipe extending up to to the axial center of the column, and connect it to the concrete hopper at the top of the steel pipe column, and match the amount of concrete ejected from the loading pipe from the hopper through the loading pipe. It is to fill the concrete at a speed.

According to a second aspect of the present invention, the concrete loading pipe is provided with ejection holes near the bottom of the lower joint, the pillar of the intermediate floor, and the upper and lower portions of the diaphragm at the beam joint.
The concrete can be ejected from each of the ejection holes.

[0007]

According to the present invention, as described above, the concrete loading pipe is inserted from the top of the filled steel pipe concrete column to the bottom of the lower joint through the axial center of the column, and the concrete hopper at the top of the steel pipe column is inserted. By filling the loading pipe with concrete, the concrete is filled into the steel pipe through the ejection holes of the loading pipe. At this time, the concrete loading is performed at a speed commensurate with the amount of concrete ejected from the loading pipe. By injecting concrete into the pipe, concrete always rises from the ejection holes in the same loading pipe, so there is no separation of aggregates, which is seen when placing in tremie pipes, unlike in the past. Can cast concrete. Further, the loading pipe is vibrated in the vicinity of the concrete placement by a vibrator inserted from a concrete hopper to remove excess air, and solid and uniform concrete is filled in the steel pipe column.

According to the second aspect of the present invention, the concrete loading pipe is provided with ejection holes at the bottom of the lower joint of the steel pipe column, the columns of the intermediate floor and the upper and lower portions of the diaphragm of the beam joint, and the concrete loading pipe is connected to the concrete loading pipe from the hopper. Since the supplied concrete is ejected from each of the ejection holes, the concrete is surely ejected into the steel pipe without adjusting the pouring height of the concrete as in the conventional method using the tremie pipe. In particular, when filling the columns on the intermediate floor of the steel pipe column and the diaphragm at the beam joint, the position of the ejection hole is ensured,
By spouting concrete from around the upper and lower sides of the diaphragm, the lower surface of the diaphragm is densely filled with concrete, and voids and the like do not occur.

Further, since the loading pipe is buried in the concrete, it is not necessary to pull it up like a tremie pipe, and labor can be saved.

[0010]

The present invention will be described below with reference to the illustrated embodiments. A is a filled steel pipe column in which the steel pipe 1 is filled with concrete, and a diaphragm B is arranged at the column and beam joint of the intermediate floor. As shown in FIGS. 4 and 5, there is an insertion hole 2 in the center of the column of each diaphragm, and an air vent hole 3 is formed at an appropriate position.

In the steel pipe pillar A, from the top of the pillar A to the lower joint, the insertion hole 2 for each diaphragm B is formed.
A concrete loading pipe 4 that extends in the axial direction of the pillar A that penetrates through the pipe A is provided, and a concrete hopper 5 is connected to the top of the pipe 4. The concrete loading pipe 4 is composed of a spiral pipe, and has a bottom portion of a lower joint in advance,
Spouts 6, 6a, 6b are provided in the upper and lower vicinity of the diaphragm of the intermediate floor column and beam joint, respectively, and these spouts open 1/3 of the circumference with respect to the plane cross section of the loading pipe 4. Often, the spouts 6a, 6b open in opposite directions.

When the steel pipe pillar A is filled with concrete, the hopper 5 is filled with concrete C from a mixer truck or the like.
From the jet port 6 of the lower joint portion to the jet port 6a,
Fill concrete with 6b in order. The concrete to be poured should contain as little air as possible,
Moreover, by using a high-performance AE water-reducing material having good flowability and imparting vibration by the vibrator 7 inserted from the hopper 5 as shown in FIG. 6,
Furthermore, it eliminates air bubbles and prevents the separation of concrete.

FIG. 2 shows a state in which concrete C is jetted from the jet port 6 in the concrete loading pipe 4 to the steel pipe column A.

[0014]

As described above, according to the present invention, the concrete loading pipe is inserted into the axial center of the column from the top of the filled steel pipe concrete column to the bottom of the lower joint, and the column top is inserted into the loading pipe. By filling the concrete into the steel pipe through the concrete hopper at a speed commensurate with the amount of concrete spouted from the same loading pipe, concrete separation does not occur, and the concrete inside the steel pipe concrete column is uniformly and solidly formed. To provide a structurally reliable filled steel pipe concrete column with improved toughness and yield strength due to the combined effect of steel pipe and concrete.

According to the second aspect of the present invention, the concrete loading pipe is provided with concrete injection holes at the bottom of the lower joint and the upper and lower portions of the diaphragm at the beam-column joint on the intermediate floor. Concrete ejected from the top and bottom causes the concrete to be densely placed on the contact surface of the diaphragm, eliminating air retention on the bottom surface of the diaphragm and gaps due to sinking of the concrete, and the steel tube column and concrete are firmly integrated. The above-mentioned reliability is improved, and since the tremie pipe is not used, it is possible to constantly supply a constant amount of concrete and save labor in the work.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing an implementation state of an example of a concrete placing method for a filled steel pipe concrete column according to the present invention.

FIG. 2 is an enlarged vertical sectional view of a spout of a concrete loading pipe.

FIG. 3 is a view taken along the line EE in FIG.

FIG. 4 is a plan view of a diaphragm.

FIG. 5 is a bottom view of the diaphragm.

FIG. 6 is a vertical cross-sectional view showing a state where concrete is ejected from a concrete loading pipe into a steel pipe column.

[Explanation of symbols]

 A Filled concrete steel pipe column B Diaphragm C Concrete 1 Steel pipe 2 Insertion hole 3 Air vent hole 4 Concrete loading pipe 5 Concrete hopper 6 Jet port 6a Jet port 6b Jet port

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yutaka Makino 4-6-15 Sendagaya, Shibuya-ku, Tokyo Fujita Co., Ltd.

Claims (2)

[Claims] 1. In a filled steel tube concrete column, a concrete loading pipe extending from the top of the column to the bottom of a lower joint is inserted into an axial center portion of the column, and is connected to a concrete hopper at the top of the steel tube column. A method for placing concrete in a filled steel pipe concrete column, comprising filling the concrete from the hopper through the loading pipe at a speed commensurate with the amount of concrete ejected from the loading pipe. 2. The concrete loading pipe is provided with ejection holes near the bottom of the lower joint, the pillars of the intermediate floor, and the diaphragm in the beam joint, and concrete can be ejected from the ejection holes. Method for placing concrete columns filled with steel pipes.