JPH0762399B2 - Method for constructing columns with steel pipe-filled concrete structure and formwork for surplus concrete - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a). INDUSTRIAL APPLICABILITY The present invention is used for implementing a method of constructing a column of a steel pipe-filled concrete structure, which is suitable for application in constructing a column of a steel pipe-filled concrete structure, and a method of constructing a column of the steel pipe-filled concrete structure. Formwork for surplus concrete.

(B). 2. Description of the Related Art FIG. 2 is a cross-sectional view showing a conventional method for constructing a pillar having a steel pipe-filled concrete structure.

2. Description of the Related Art Conventionally, a pillar 9 of a steel pipe-filled concrete structure is constructed in a building with a high roof such as a warehouse as shown in FIG.
This is done by installing a steel pipe 10 having the same height H1 as the height H1 of the pillar 9 to be constructed above, and filling and solidifying the steel pipe 10 with concrete.

(C). However, in this method, the press-fitting method from below is used for the concrete filling method, and the concrete press-fitting hole below the steel pipe 10 is used.
When concrete is press-fitted from 10a, the casting height is large, so the rise of breathing and the concentration of mortar on the inner surface of the steel pipe 10 cause the upper portion of the poured concrete 11 to be cast, and the quality is deteriorated. It becomes bad concrete 12 shown in the shaded area. Also, when concrete is poured from above, the upper portion of the filled concrete 11 becomes defective concrete 12 due to breathing. If this bad concrete 12 is used as a part of the components of the pillar 9 without being removed, the bad concrete 12 has a low strength. Therefore, in order to obtain the necessary strength, the bad concrete 12 is taken into consideration in an excessive design. I have to

In addition, by applying the conventional technology for forming and removing excess pile concrete in cast-in-place piles, the extra pile concrete is placed on the upper part of the steel pipe column, and after the solidification of concrete, the extra pile portion is peeled off. Although it is possible to remove it by noise, the noise and dust caused by fishing are not so problematic in the basic work such as construction of cast-in-place piles because the structure has not been constructed yet. , With the building already built to some extent,
When removing the surplus concrete of the steel pipe columns that form part of the structure, if fishing is performed, not only will the noise echo inside the structure space under construction, but also inside the structure space where dust is also blocked. It will be impossible to adopt it at all, as it will worsen the site environment extremely. Therefore,
It has been desired to develop a method for constructing a column of a steel pipe-filled concrete structure that can easily remove excess concrete without chipping, and a form for extra concrete.

In order to solve the above problems, the present invention can easily remove a portion of defective concrete from concrete constituting a column without performing chipping, etc. The purpose is to provide a formwork for fill concrete.

(D). Means for Solving the Problems That is, among the present invention, the invention of the method for constructing a column of a steel pipe-filled concrete structure is the height of the column (1) to be constructed (H1 ) A flange (3a) having a tip end projecting toward the inside of the mold at the lower part of the inner peripheral surface of the main steel pipe (2) having the same height as that of (1) so as to be connected to the main steel pipe. ) Is formed integrally with the extra-concrete formwork (3), the concrete is filled up to a position (H1 + H2) higher than the height of the column to be constructed, and the concrete is overfilled. A notch formed in the filled concrete between the formwork and the main steel pipe, the horizontal dimension of which is smaller than the concrete in the overfill concrete formwork and the concrete in the main steel pipe by the brim. Forming (6a), Configured so as to build the pillar by integrally removing the excess overlay for concrete formwork and weld reinforcement concrete after solidification of Nkurito through the notch.

Further, of the present invention, the invention of the formwork for extra-concrete concrete,
It has a tubular main body (3b), and a flange (3a) is integrally provided with the main body on the inner peripheral surface of the lower part of the main body, the front end projecting toward the inside of the mold.

The numbers in parentheses are for convenience of showing the corresponding elements in the drawings, and therefore the present description is not limited to the description in the drawings. The same applies to the section "(e). Action" below.

(E). Action With the above configuration, the excess concrete in the excess concrete formwork (3) is integrated with the excess concrete formwork (3) from the notch (6a) formed by the collar (3a). It acts so as to be removed from the main steel pipe (2) in the form of being removed.

(F). Embodiments Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a cross-sectional view showing an embodiment of a method for constructing a column of a steel pipe-filled concrete structure and a formwork for extra-filled concrete according to the present invention.

As shown in FIG. 1, the surplus concrete formwork 3 according to the present invention is provided so as to be connected above the main steel pipe 2 installed on the floor 7. The main steel pipe 2 has a main body 2b made of a steel pipe formed in a cylindrical shape, and a concrete press-fitting hole 2a is provided in a lower portion of the main body 2b so as to penetrate the inside and outside of the steel pipe 2. The surplus concrete formwork 3 has a main body 3b having a height of H2 and an outer diameter and an inner diameter which are formed in the same cylindrical shape as the main steel pipe 2, and on the innermost surface of the lowermost portion of the main body 3b. The brim 3a having a wedge-shaped cross section is integrally provided with the main body 3b in a form in which a tip end portion of the brim 3a is projected into the mold.

Since the surplus concrete formwork 3 has the above-mentioned configuration, when the surplus concrete formwork 3 is used to construct the pillar 1 of the steel pipe-filled concrete structure in a building with a high roof such as a warehouse, the floor The main steel pipe 2 having the same height H1 as the height H1 of the pillar 1 to be constructed is installed on the above-mentioned 7 and the above-mentioned wedge-shaped steel pipe 2 provided above the main steel pipe 2 is provided on the extra-concrete concrete formwork 3. The formwork 3 for extra concrete is connected to the main steel pipe 2 so that the collar 3a is located at the boundary between the main steel pipe 2 and the formwork 3 for extra concrete.

Next, concrete is press-fitted through the concrete press-fitting hole 2a to reach the uppermost portion of the surplus concrete formwork 3, that is, the height.
Pour up to H1 + H2, and fill the inside of the main steel pipe 2 and the overfill concrete form 3 with concrete. At this time, since the casting height is large, the rise of breathing and the concentration of mortar on the steel pipe surface cause the top of the filled concrete to become defective concrete 12 shown in the perspective view in the figure with deteriorated quality, The defective concrete 12 is located at a position higher than the height H1 of the column 1 to be constructed, and constitutes a part of the excess concrete 6 filled in the excess concrete formwork 3. Therefore, the permanent concrete 5 filled in the permanent steel pipe 2 is composed of high-quality concrete containing no defective concrete 12. In addition, the lowermost portion of the surplus concrete 6, that is, the concrete that is filled and placed between the surplus concrete form 3 and the main steel pipe 2, has a wedge-shaped brim provided on the surplus concrete form 3. A notch 6a corresponding to 3a is formed.

After solidification of the filled concrete, the surplus concrete 6 and the surplus concrete form 3 are physically removed by cutting the surplus concrete 6 and the permanent concrete 5 at the position of the notch 6a formed. Then, the pillar 1 of the steel pipe-filled concrete structure composed of the permanently installed steel pipe 2 and the permanently installed concrete 5 made of only good quality concrete is constructed.

At this time, since the notch 6a is formed to have a smaller horizontal dimension in the figure than the surplus concrete 6 above the notch 6a and the permanent concrete below, the surplus concrete 6 is not With respect to the notch 6a part is easily removed. In addition, since the surplus concrete 6 is integrally removed together with the surplus concrete formwork 3,
Excessive concrete can be removed while suppressing the generation of dust.

In addition, due to the collar provided on the surplus concrete formwork,
The surplus concrete and the surplus concrete formwork 3 that have been integrally cut and removed do not cause the surplus concrete to fall out of the surplus concrete formwork inadvertently downward in FIG. It is extremely safe because it can be maintained in the integrated state with the concrete formwork even after cutting.

In the embodiment described above, the cylindrical main steel pipe 2
Although the construction method in the case of the column 1 of the steel pipe-filled concrete structure constituted by is described above, the main steel pipe does not necessarily have to be cylindrical, and the construction of the column constituted by the steel pipe of any cross-sectional shape is also described above. It can be performed in the same manner as the construction method of the embodiment described above. Further, the case where the cross-sectional shape of the extra-concrete concrete formwork 3 other than the collar 3a is the same as the cross-sectional shape of the main steel pipe 2 has been described, but the cross-sectional shape is similar to the cross-sectional shape of the main steel pipe 2. It does not need to be provided, and may have an arbitrary cross-sectional shape as long as the lowermost portion that is connected to the permanent steel pipe 2 is formed in a shape that can be successfully connected to the permanent steel pipe 2. Although the case where the collar 3a provided on the surplus concrete form 3 is wedge-shaped has been described, the collar 3a is used so that the surplus concrete 6 and the permanent concrete 5 can be easily cut. Since the notch 6a is formed in the groove 6, the shape other than the wedge shape may be used. Also, the case of using the press-fitting method from below the steel pipe body 2b for the concrete filling method was described, but from the top of the surplus concrete formwork 3 without providing the concrete press-fitting hole 2a in the main body 2b of the permanent steel pipe 2. You may make it pour concrete.

(G). Effect of the Invention As described above, according to the present invention, when constructing a column having a steel pipe-filled concrete structure, the above-mentioned main steel pipe 2 having the same height as the height H1 of the column 1 to be constructed is provided above the main steel pipe 2. A form 3 for extra-concrete concrete is formed by integrally forming a brim 3a with a tip projecting toward the inside of the form at the lower part of its inner peripheral surface so as to connect to the main steel pipe. The concrete is filled up to a position H1 + H2 higher than the height of the power column to fill the concrete, and the filled concrete between the formwork for the excess concrete and the main steel pipe is filled with the excess concrete by the collar. Forming a notch 6a formed in a horizontal dimension smaller than the concrete in the concrete form and the concrete in the main steel pipe, and after the solidification of concrete the form for extra concrete and the extra concrete Since it is configured so as to build the pillar by integrally removed via outs Ri, bad bad concrete 12 quality caused by the mortar is concentrated on the inner surface of the rise of the breathing and the 設鋼 tube 2
It is possible to generate a part in the upper part of the filled concrete, that is, in the extra-filled concrete 6 part, and the main concrete 5 filled in the part of the main steel pipe 2 is only good quality concrete not containing bad concrete 12. Can be configured. Then, the defective concrete 12 is integrally removed as a part of the surplus concrete 6 together with the surplus concrete formwork 3. Therefore, the pillar 1 to be constructed is composed only of high-quality concrete, the strength of the concrete can be estimated to be high, and it is not necessary to consider the bad concrete 12 and design excessively.

Further, since the notch 6a is formed by the brim to have a horizontal dimension smaller than that of the concrete in the formwork for the extra-concrete concrete and the concrete in the main steel pipe, the extra-concrete concrete 6 is smaller than that of the main concrete 5. It is easily removed from the cutout 6a. In addition, since the surplus concrete 6 is integrally removed together with the surplus concrete formwork 3, it does not take time and the noise and dust caused by chipping work are minimized. Can be removed.

Moreover, the surplus concrete and the surplus concrete formwork 3 that have been integrally cut and removed by the collar provided on the surplus concrete formwork are shown in FIG. 1 below the surplus concrete from the surplus concrete formwork. It does not fall out carelessly, and the integrated state of the overfilled concrete and the overfilled concrete formwork can be maintained even after cutting, which is extremely safe.

Further, the extra-concrete concrete formwork 3 has a tubular main body 3b, and a brim 3a having a tip end projecting toward the inside of the formwork is integrally formed with the main body on the inner peripheral surface of the lower part of the main body. Since it is provided in the structure, the notch 6a is formed at a position corresponding to the brim 3a of the surplus concrete 6 and the surplus concrete 6 is formed at that position.
The extra concrete formwork 3 and the extra concrete 6 are removed in a form in which the main concrete 5 and the permanent concrete 5 are integrally cut, but the cut surface area is formed to be small by the notch 6a. The concrete form 3 and the extra concrete 6 can be easily removed. In addition, 6 is the surplus concrete due to the collar 3a
Since it is removed together with it, the excess concrete can be removed while suppressing the generation of dust and the like as much as possible.

Moreover, the surplus concrete and the surplus concrete formwork 3 that have been integrally cut and removed by the collar do not cause the surplus concrete to fall out of the surplus concrete formwork inadvertently downward in FIG. It is extremely safe because the integrated state of the fill concrete and the formwork for the extra fill concrete can be maintained even after cutting.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a method of constructing a column of a steel pipe-filled concrete structure and an embodiment of a form for surplus concrete according to the present invention, and FIG. 2 is a diagram of a method of constructing a column of a conventional steel pipe-filled concrete structure. FIG. 1 ... Pillar 2 ... Permanent steel pipe 3 ... Overfill concrete formwork 3a ... Tsuba 3b ... Main body 6 ... Overfill concrete 6a ... Notch

Continuation of front page (56) Reference JP 62-78359 (JP, A) JP 54-125810 (JP, A) JP 59-65122 (JP, A) JP 63-523 (JP , A) Japanese Patent Laid-Open No. 51-78359 (JP, A) Shoukai 62-163534 (JP, U)

Claims (2)

[Claims] 1. When constructing a pillar having a steel pipe-filled concrete structure, a lower part of an inner peripheral surface of the pillar is connected to the main steel pipe above the main steel pipe having the same height as the height of the pillar to be constructed. A formwork for extra concrete with a brim with the tip protruding toward the inside of the formwork is provided on the top of the formwork, and the concrete is filled to a position higher than the height of the column to be constructed to allow the concrete to remain. Filling, in the filled concrete between the surplus concrete formwork and the main steel pipe, the concrete in the surplus concrete formwork and the concrete in the main steel pipe by the collar The pillar is formed by forming a notch with a small size, and after solidifying the concrete, integrally removing the surplus concrete formwork and the surplus concrete through the notch. A method of constructing a steel pipe-filled concrete structure column constructed as described above. 2. A surplus concrete which has a tubular main body, and is provided integrally with the main body on a lower inner peripheral surface of the main body, which is provided with a brim having a front end projecting toward the inside of the mold. Formwork.