JPH0533493A - Method of filling concrete in pipe-like column - Google Patents

Abstract

PURPOSE:To prevent occurrence of blockage accident in a pipe in a process of upwardly press-charging concrete which is fed under pressure by a pump, into a pipe-like column which has been vertically laid. CONSTITUTION:A rod-like irregular shape agitating member 5 having a specific weight greater than that of concrete 4 is suspended in a pipe-like column 1 from the top of the latter. The agitating member 5 is substantially embedded in the top end part of the concrete 4 during charging. As the charging of the concrete 4 is progressed, the agitating member 5 is gradually pulled upward.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for filling concrete in a tubular column for constructing a steel pipe concrete column in a building structure, and more particularly to a method for pumping a tubular column which is arranged substantially vertically. The present invention relates to a method of press-fitting and filling concrete which is pumped by a method from bottom to top.

[0002]

2. Description of the Related Art When constructing steel pipe concrete columns, a method of filling concrete into steel pipe columns arranged almost vertically is to place concrete from the upper part of the steel pipe columns using a tremie pipe or the like. Typical methods are a method and a method in which concrete pumped by a pump is pressed and filled upward from a filling hole provided near the bottom of the steel pipe column.

For example, Japanese Patent Laid-Open Publication No. Sho 6-86 has been used for steel pipe columns for building structures.
As can be seen in JP-A-2-72840 (E04B1 / 30), it is general that a reinforcing member called a stiffener or the like is projected on the inner peripheral surface of the pipe. The inside of the pipe is narrowed in places by the reinforcing member protruding on the inner peripheral surface of the pipe. In the method of placing concrete from the top of the steel pipe column with the tremie pipe, etc., it is easy to create a void that is not filled with concrete just below the narrowed part in the pipe, and when filling concrete from below the steel pipe column by the pump press-fitting method It doesn't have that drawback.

[0004]

However, in the method of filling the steel pipe columns with concrete from the bottom to the top by the pump press-fitting method, a blockage accident may occur inside the steel pipe columns during press-fitting construction. When concrete is pressed into the steel tube column from below with a pump, the cement paste component and mortar component of the rising concrete are adsorbed on the inner wall surface of the steel column, and the ratio of coarse aggregate increases at the top of the concrete being filled. .. When the concrete top end portion having a large amount of coarse aggregate rises and reaches the narrowed portion such as the stiffener, the arching phenomenon of the coarse aggregate occurs, and blockage occurs at this portion. If concrete is continuously press-fitted by the pump in the closed state, the steel pipe column may be deformed particularly in the case of the rectangular steel pipe column.

As a countermeasure against the above-mentioned blockage accident, conventionally, a method has been adopted in which mortar is first fed into a steel pipe column, and this mortar is fed next to the concrete and the steel pipe column as a lubricant. ing. However, with this method, after filling one steel pipe column with concrete, when moving to the construction of the next steel pipe column, the concrete remaining in the pump pipe must be treated and pumped from the mortar again. It was necessary to change the setup for each piece, which was troublesome and inefficient. Also, an appropriate disposal method for residual concrete in pump piping must be considered.

The present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to fill concrete into a tubular column by a pump press-fitting method even if there is a narrowed portion in the tubular column during filling. It is to prevent the inside of the tube from being blocked by a simple means.

[0007]

In view of the above, according to the present invention, in a method of press-filling concrete pumped by a pump into tubular columns arranged substantially vertically, the chain-like structure having a larger specific gravity than concrete is used. Alternatively, a deformed rod-shaped disturbing member was hung from above into the tubular column so as to be half-embedded in the top end portion of the concrete being filled, and this disturbing member was gradually pulled up as the concrete was being filled.

[0008]

The arching phenomenon of the coarse aggregate occurs at the top end portion of the concrete being filled in the narrowed portion in the tubular column, thereby causing the closed state inside the pipe, but hanging down from above. If the disturbing member is pulled up at an appropriate speed, the arching of the coarse aggregate is destroyed, and the blockage accident is prevented in advance.

[0009]

FIG. 1, FIG. 2 and FIG. 3 show an embodiment of the method of the present invention. As shown in FIG. 1, a steel pipe pillar 1 is vertically arranged, and a pump 3 is installed in an inlet 2 opened near the lower end of the steel pipe pillar 1.
The concrete 4 pumped by the pump 3 is press-filled into the steel pipe pillar 1 from the bottom to the top.

Reference numeral 5 denotes the above-mentioned disturbing member, the details of which are shown in FIG. The disturbing member 5 of this embodiment is formed by radially welding a large number of thin horizontal rods 5b to a mandrel 5a made of a metal rod having a length of 2 to 3 meters. The horizontal bar 5b has a length of about 5 cm, and is welded radially around the mandrel 5a. Further, horizontal bars 5b are attached at intervals of about 5 cm in the longitudinal direction of the mandrel 5a.
The disturbing member 5 has such a weight (specific gravity) that it is appropriately submerged in the concrete 4. In addition, as shown in FIG.
Stiffeners 1a, which overhang as reinforcing members, are provided in various places inside the stiffener 1a.
The size is such that it can pass vertically through the steel pipe column 1 narrowed by.

As shown in FIG. 1, the disturbing member 5 is connected to the steel pipe column 1.
The suspension member 5 is vertically suspended in the steel pipe column 1 by suspending the rope 6 from the upper end opening of the rope and inserting the rope 6 into the steel pipe column 1 and winding or unwinding the rope 6 with a winch 7. To be able to Then, when the concrete 4 is press-fitted into the steel pipe pillar 1 from the injection port 2, the disturbing member 5 suspended by the rope 6 is half buried in the top end portion of the concrete 4 being filled. As the top of the concrete 4 rises as the filling of the concrete 4 progresses, the rope 6 is wound up by the winch 7 in accordance with it.
The disturbing member 5 is gradually raised. As shown in FIG. 3, the aggregate of the coarse aggregate at the top end of the concrete 4 is the steel pipe column 1.
When reaching the narrowed portion by the stiffener 1a inside, the narrowed portion is blocked by arching of the coarse aggregate in some cases, but the arching of the coarse aggregate is broken and disturbed by the disturbing member 5 being pulled up by the rope 6. The concrete 4 together with the member 5 is also pushed upward through the narrowed portion.

Although the disturbing member 5 of the above-mentioned embodiment has a deformed rod shape having a large number of horizontal rods 5b, the present invention is not limited to this, and is made of, for example, a chain of iron having an appropriate thickness. The members can also achieve the same effects as the above.

[0013]

As described in detail above, according to the present invention, the disturbing member hung from above in the tubular column is half-embedded in the top end portion of the concrete being filled, and the disturbing member is advanced as the filling of the concrete progresses. Since it was gradually pulled up, even if there is a constriction part in the tubular column due to the reinforcing member, etc., and the aggregate of the coarse aggregate at the concrete top end part arches, the disturbing member is pulled up and arching will occur. The concrete that has been destroyed and pressed in from below is pushed up smoothly together with the disturbing member, and no blockage accident occurs.

[Brief description of drawings]

FIG. 1 is a general view showing an embodiment of a method of the present invention.

FIG. 2 is a detailed view of the disturbing member in the embodiment of the present invention.

FIG. 3 is an enlarged view showing a state in which the agitation member destroys the arching by the coarse aggregate of the concrete top end portion.

[Explanation of symbols]

 1 Steel tube column 1a Stiffener 2 Injection port 3 Pump 4 Concrete 5 Disturbing member 5a Mandrel 5b Horizontal bar 6 Rope 7 Winch

Claims (1)

Claim: What is claimed is: 1. A method in which concrete pumped by a pump is press-fitted and filled into tubular columns that are arranged substantially vertically, and a chain-like or deformed rod-like shape having a higher specific gravity than concrete is used. The inside of the tubular column is characterized in that the agitation member is hung from above into the tubular column so as to be half-embedded in the top end portion of the concrete being filled, and the agitation member is gradually pulled up as the filling of the concrete progresses. How to fill the concrete with.