JP2002097718A - Erection method for steel-pipe column - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a erection method for a steel-pipe column, enabling a cage and the steel-pile column to be accurately erected in a prescribed position within an excavated pile hole by concurrently erecting the cage and the steel-pile column within the excavated pile hole even when there is little difference between the outside diameter of the steel-pipe column and the inscribed circle diameter of the cage whereinto the steel-pipe column is inserted. SOLUTION: In the erection method wherein the cage 5 and the steel-pipe column 9 are erected within the excavated pile hole 3 so as to place concrete C, the lower end of the column 9 is inserted into the upper end of the cage 5 lowered in suspended state partway into the pile hole 3 and fixed by welding, etc. After that, the cage 5 is further lowered in the suspended state through the column 9, and the cage 5 and the column 9 are erected in the prescribed position within the pile hole 3 for the purpose of placing the concrete C.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for erection of steel pipe columns used in, for example, railway viaduct construction.

[0002]

2. Description of the Related Art Conventionally, when constructing a building such as a building or a bridge, a pile hole having a required diameter and depth is excavated, a reinforced cage is buried in the pile hole, and concrete is cast and constructed. A steel pipe column such as a concrete-filled steel pipe column (herein referred to as a “steel pipe column”) is erected above the cast-in-place pile, and the cast-in-place pile and the steel pipe column are integrated by casting concrete. Is used.

[0003] By the way, in the railway viaduct, there are only a few actual results of the embedding method using steel pipe columns. However, all of these methods are based on the concrete casting of cast-in-place piles and The construction method is used.

[0004]

However, for example, in the case of a railway viaduct, the outer diameter of the steel pipe column and the inscribed diameter of the steel cage into which the steel pipe column is inserted are taken into consideration in view of the required ground support force and the like. May be small. In such a case, it is actually extremely difficult to insert the lower end of the steel pipe column into the upper end of the steel cage located in the pile hole by the post-building method due to construction errors and the like. there were.

The present invention has been made in view of the above-mentioned problems in the conventional method of embedding steel pipe columns, and even when the difference between the outer diameter of the steel pipe columns and the inscribed diameter of the steel cage into which the steel pipe columns are inserted is small.
An object of the present invention is to provide a steel pipe column embedding method in which a steel cage and a steel pipe column can be accurately built at a predetermined position in a pile hole by simultaneously installing a steel cage and a steel pipe column in an excavated pile hole. And

[0006]

Means for Solving the Problems To achieve the above object, a method of embedding a steel pipe column according to the present invention comprises a method of embedding a reinforcing rod cage and a steel pipe column in an excavated pile hole and placing concrete. In the erection method, the lower end of the steel pipe column is inserted into the upper end of the steel cage suspended halfway into the pile hole, fixed by welding or the like, and then the steel cage is further suspended via the steel tube column. The steel cage and the steel pipe column are erected at predetermined positions in the pile hole, and concrete is poured into the pile hole.

In this method of installing a steel pipe column, the lower end of the steel pipe column is inserted into the upper end of a reinforcing rod cage suspended halfway into a pile hole, fixed by welding or the like, and then inserted through the steel pipe column. In addition, the reinforcing rod cage is further lowered and the reinforcing rod cage and the steel pipe column are erected at a predetermined position in the pile hole, and concrete is poured into the pile hole, so that the outer diameter of the steel pipe column and the steel pipe column are inserted. Even when the difference from the inscribed diameter of the reinforced cage is small, the lower end of the steel pipe column is inserted into the upper end of the reinforced cage, and excavation is performed with the axes of the reinforced cage and the steel tube column aligned. Reinforced baskets and steel pipe columns can be erected in the pile holes.

In this case, a socket steel pipe is externally fitted to the upper end portion of the reinforcing steel basket such that the upper end of the reinforcing steel basket is exposed from above, and fixed by welding or the like, and the reinforcing steel basket is overlapped with the socket steel pipe. Then, the lower end of the steel pipe column can be inserted and fixed by welding or the like.

Thus, the connecting portion between the reinforcing rod cage and the steel pipe column is
A steel pipe column such as a concrete-filled steel pipe column having high strength can be reinforced by a socket steel pipe.

[0010] Further, a steel pipe column verticality detector and a steel pipe column verticality correction means can be provided on the steel pipe column so as to be recoverable.

Thus, the verticality of the steel pipe column can be corrected from the ground, and the vertical accuracy of the steel pipe column can be easily ensured, and the construction cost can be reduced.

In addition, a dummy tube having a release material formed on the surface thereof can be disposed inside a casing forming the peripheral wall of the pile hole.

[0013] Accordingly, even after the cast concrete is hardened to some extent, the casing and the rust-proof coating applied to the steel pipe column are not damaged, and the installation accuracy of the steel pipe column once built is not adversely affected. If necessary, the dummy tube can be pulled out and collected.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a steel pipe column embedding method according to an embodiment of the present invention.

FIG. 1 to FIG. 10 show an embodiment of a steel pipe column embedding method according to the present invention. As shown in FIG. 1 (a), a method of embedding a steel pipe column is as follows. First, a casing 2 is pressed into the ground by a power jack 1 installed at a position where the steel pipe column is built, and the inside of the casing 2 is excavated. Thus, a pile hole 3 having a required diameter and depth is formed.

Next, as shown in FIG. 1 (b), along the inner periphery of the casing 2 constituting the peripheral wall of the pile hole 3, a dummy tube 4 having a release material formed on the surface is disposed. . The outer diameter of this dummy tube 4 is slightly smaller than the inner diameter of the casing 2, and the length (height) thereof is at least the concrete casting height H at the connecting portion between the reinforcing rod cage 5 and the steel pipe column 9 described later. (Usually about 2.0 m), for example, about 2.5 to 3.0 m, and by attaching a release material such as urethane rubber to the inner and outer peripheral surfaces. It consists of a formed thin steel pipe. As shown in FIG. 5, the dummy tube 4 is connected to the casing 2 through a plurality of, in this embodiment, two PC steel rods 6 before the reinforcing cage 5 is built in the pile hole 3. By suspending along the lower inner periphery of the steel bar, it is disposed at the position of the connecting portion between the steel cage 5 and the steel pipe column 9 described later, and the upper end of the PC steel rod 6 is connected to the pile hole 3.
To the base frame 7 and the like installed at the upper end of the casing 2 installed on the upper part of the casing 2. Thereby, even after the concrete poured in has hardened to some extent, without damaging the rust preventive coating applied to the steel pipe column 9 or adversely affecting the installation accuracy of the steel pipe column 9 once built, the casing 2 and further, The dummy tube 4 can be pulled out and collected as needed.

Then, as shown in FIG. 1 (c), the reinforcing rod cage 5 is suspended halfway into the pile hole 3 using a crane or the like, and the upper end of the reinforcing rod cage 5 is positioned on the work stand K on the ground. Then, for example, it is temporarily fixed to the base frame 7 installed at the upper end of the casing 2 so that the upper end of the reinforcing cage 5 is exposed from above at the upper end of the reinforcing cage 5 as shown in FIG. The socket steel pipe 8 is externally fitted to the
In the present embodiment, the lower part is fixed at eight places and the upper part is fixed at four places.

In this state, as shown in FIG. 1 (e), the steel pipe column 9 is suspended via the suspension fitting 10, and the lower end thereof is
It is inserted into the reinforcing steel basket 5 so as to overlap with the socket steel pipe 8, and is welded at a plurality of places, in this embodiment, 4 places.
So that it is fixed in place.

As described above, the socket steel pipe 8 is externally fitted to the upper end portion of the reinforcing steel basket 5 so that the upper end of the reinforcing steel basket 5 is exposed from above, and is fixed by welding or the like. The lower end of the steel pipe column 9 is inserted so as to overlap with and fixed by welding or the like.
The connecting portion between the steel tube column 9 and the steel tube column 9 can be reinforced by the socket steel tube 8, and the steel tube column 9 such as a concrete-filled steel tube column with high strength can be constructed.

As shown in FIGS. 6 and 7, the hanging fitting 10 used for suspending the steel pipe column 9 is constituted by an openable band for fastening and fixing the steel pipe column 9, and is suspended by a wire 10a such as a crane. It is configured to be able to. A cushion member such as hard rubber is provided on the inner peripheral surface of the opening / closing band of the hanging fitting 10 so as not to damage the rust-proof coating applied to the steel pipe column 9 when the steel pipe column 9 is tightened and fixed. Have been.

In this case, a water pipe 11 as a verticality detector of the steel pipe column 9 is arranged to be recoverable on the steel pipe column 9. As shown in FIG. 6 (a), the water pipe 11 is fixed by an openable / closable band 18 for fixing the upper and lower portions of the steel pipe column 9, and is built together with the steel pipe column 9. The openable band 18 is constructed by placing the steel pipe column 9 in the pile hole 3, casting concrete, and then operating the operating rod 18 b with the operating handle 18 a from the ground, so that at least the lower openable band 18 is operated. (In the present embodiment, the lock of the upper opening / closing band 18 is released directly on the ground), whereby it is lifted by a wire 18d such as a crane. By the connection member 1
8c together with the upper and lower openable bands 18 connected by
The water pipe 11 can be collected. The water pipe 11 is shown in FIG.
As shown in (b), a vertical tube 11a filled with water is provided with an uki 11c sunk so as to be pulled by a thread 11b from below, and the center of the uki 11c and the center of the tube 11a are viewed from above. Thereby, the inclination of the steel pipe column 9 can be known. The balance weight 18e is arranged at a position symmetrical to the position where the water pipe 11 of the steel pipe column 9 is arranged.

In this manner, the lower end of the steel pipe post 9 is inserted into the reinforcing steel basket 5 so as to overlap the socket steel pipe 8 and fixed by welding or the like, and then, as shown in FIG. The reinforcement basket 5 is further suspended and lowered through the reinforcement 9, and the reinforcement basket 5 and the steel pipe column 9 are erected at a predetermined position in the pile hole 3.

In this state, as shown in FIG. 2A, the position of the upper end of the steel pipe column 9 in the horizontal direction is adjusted by using the slide adjusting device 13 shown in FIG. The height adjustment of the steel pipe column 9 is performed by the level adjustment jack 14.

As shown in FIG. 8, the slide type adjusting device 13 is a movable fixture 13a, 13a which is disposed from two orthogonal directions to the center of the girder frame 12 installed on the base frame 7. And two fixed fixtures 13b, 13b arranged at positions opposite to the fixture 13a, and the steel pipe columns 9 are provided at the tips of the fixtures 13a, 13b.
A cushion member made of hard rubber or the like is provided so as not to damage the rust-preventive coating applied to the vehicle.

As shown in FIG. 9, a plurality of, in this embodiment, two, level adjusting jacks 14 are interposed between the base stand 7 and the hanging fittings 10, and the level adjusting jack 14 has a main body. The height of the steel pipe column 9 can be adjusted by adjusting the height using the screw portion and the spacer 14a.

In addition to performing the horizontal position adjustment of the upper end portion of the steel pipe post 9, as shown in FIG. The vertical-correction hydraulic jack 15 as the degree-correcting means is disposed so as to be retrievable, and the vertical-correction hydraulic jack 15 is used to check the steel pipe column 9 while checking it with the water pipe 11 as the vertical detector of the steel pipe column 9. To correct the verticality. As shown in FIG. 10, a plurality of the verticality correcting hydraulic jacks 15, four in this embodiment, are individually suspended between the casing 2 and the steel pipe column 9 at substantially equal angular intervals. By being supported by being suspended from the upper end of the casing 2 by the rod 15a, it can be installed and collected from the ground, and the tip of the vertical-correction hydraulic jack 15 is attached to the steel pipe column 9 at the tip thereof. A cushion member made of hard rubber or the like is provided so as not to damage the rust preventive coating.

Thus, the slide type adjusting device 13
And verticality correcting hydraulic jack 1 as verticality correcting means
5, the horizontal position adjustment and the verticality of the steel pipe column 9 built in the pile hole 3 can be adjusted, and the height adjustment of the steel pipe column 9 can be performed by the level adjustment jack 14.

When the rebar cage 5 and the steel pipe columns 9 have been installed in the pile holes 3 in this way, as shown in FIG. The concrete C is poured to the upper position of the connection portion 9 (concrete casting height H (normally, about 2.0 m)), and then, as shown in FIG. C
1 is to be removed.

After the poured concrete C hardens to some extent so as not to adversely affect the setting accuracy of the built-in steel pipe column 9, the water pipe 11 and the vertical as a means for correcting the verticality of the steel pipe column 9 are used. Degree correction hydraulic jack 15,
After collecting the casing 2 and, if necessary, the dummy tube 4 on the ground, as shown in FIG.
The eccentricity preventing jack 17 as the eccentricity preventing means is disposed, and the periphery of the steel pipe column 9 is backfilled with a backfilling material such as sand.

According to the steel pipe column embedding method, the lower end of the steel pipe column 9 is inserted into the upper end of the reinforcing rod cage 5 suspended halfway into the pile hole 3 and fixed by welding or the like. The steel cage 5 is further suspended and lowered via the steel pipe column 9, and the steel cage 5 and the steel pipe column 9 are erected at predetermined positions in the pile hole 3.
Since the concrete C is poured into the pile hole 3, when the difference between the outer diameter of the steel pipe column 9 and the inscribed diameter of the reinforcing rod cage 5 into which the steel pipe column 9 is inserted is small, for example, Even when the outer diameter of the steel pipe 9 is φ800 mm, the inscribed diameter of the reinforcing rod 5 is 858 mm, and the difference is 58 mm, the lower end of the steel pipe column 9 is inserted into the upper end of the reinforcing basket 5, and the reinforcing rod 5 and the steel pipe column are further inserted. The steel cage 5 and the steel pipe column 9 can be erected in the excavated pile hole 3 in a state where the axes of 9 are aligned.

Although the method of embedding a steel pipe column according to the present invention has been described above based on the embodiment, the present invention is not limited to the configuration described in the above embodiment, and does not deviate from the gist thereof. The configuration can be changed as appropriate.

[0032]

According to the steel pipe column embedding method of the present invention, the reinforcing rod cage suspended in the pile hole partway is
After inserting the lower end of the steel pipe column and fixing it by welding or the like, the steel cage is further suspended and lowered through this steel pipe column, and the steel cage and the steel pipe column are erected at a predetermined position in the pile hole. Since the difference between the outer diameter of the steel pipe column and the inscribed diameter of the steel cage in which the steel pipe column is inserted is small, the lower end of the steel pipe column is attached to the upper end of the steel cage. In addition, a steel cage column and a steel pipe column can be built into the excavated pile hole with the axis of the steel cage column and the steel tube column aligned with each other. Etc. can be constructed.

Further, a socket steel pipe is externally fitted to the upper end of the reinforcing steel basket so that the upper end of the reinforcing steel basket is exposed from above, and is fixed by welding or the like. By inserting the lower end of the steel pipe and fixing it by welding, etc., the connection part between the steel cage and the steel pipe column can be reinforced by the socket steel pipe, and steel pipe columns such as concrete-filled steel pipe columns with high strength are constructed. can do.

Further, by providing the steel pipe column with a steel pipe column verticality detector and a steel pipe column verticality correction means, each of which can be collected, the verticality of the steel pipe column can be corrected from the ground. The vertical accuracy of the steel pipe column can be easily ensured, and the construction cost can be reduced.

Further, by disposing a dummy tube having a release material formed on the surface thereof inside the casing constituting the peripheral wall of the pile hole, the rust preventive coating applied to the steel pipe column can be damaged, or the steel pipe once installed can be damaged. Even after the poured concrete has hardened to some extent, the casing and, if necessary, the dummy tube can be pulled out and collected without adversely affecting the accuracy of the pillars being built.

[Brief description of the drawings]

FIG. 1 shows an embodiment of a steel pipe column embedding method according to the present invention, and (a) to (f) are cross-sectional views showing first to sixth steps.

FIGS. 2A to 2E are cross-sectional views showing seventh to eleventh steps.

FIG. 3 is an overall front view showing equipment for implementing the steel pipe column embedding method of the present invention.

FIG. 4 is an overall sectional view showing equipment for implementing the steel pipe column embedding method of the present invention.

FIG. 5 is an explanatory view showing a dummy tube.

FIGS. 6A and 6B are explanatory views showing a water pipe, wherein FIG. 6A is a front view showing an attached state, and FIG. 6B is an enlarged view of an upper part of the water pipe.

FIGS. 7A and 7B are explanatory views showing a hanging bracket, wherein FIG.
(B) is a front view, and (c) is a longitudinal sectional view.

8 (a) is an overall plan view, FIG. 8 (b) is an enlarged cross-sectional view of a fixed type fixing device, and FIG. 8 (c) is an enlarged vertical sectional view of a fixed type fixing device. Figure, (d)
FIG. 2 is an enlarged cross-sectional view of a movable fixture.

9A and 9B are explanatory views showing a level adjustment jack, wherein FIG. 9A is an overall front view, and FIG. 9B is a front view of the level adjustment jack.

FIG. 10 is an explanatory view showing a verticality correcting hydraulic jack,
(A) is a longitudinal sectional view, (b) is a plan view.

[Description of Signs] 1 Power jack 2 Casing 3 Pile hole 4 Dummy tube 5 Reinforcing cage 6 PC steel bar 7 Base stand 8 Socket steel pipe 9 Steel pipe pillar 10 Hanging fixture 11 Water pipe 11a Pipe 11b Thread 11c Thread 12 Grid girder frame 13 Sliding adjustment Apparatus 14 Level adjustment jack 14a Spacer 15 Verticality corrected hydraulic jack 16 Toremi pipe 17 Eccentricity prevention jack 18 Removable band C Concrete C1 Surplus section K Work stand

Continued on the front page (72) Inventor Masami Takenouchi 4-55, Kodenike-ku, Osaka-shi, Osaka 4-72, Konoike-gumi Co., Ltd. (72) Inventor Yuro Yoshioka 4-3-55, Konohana-ku, Osaka-shi, Osaka Konoike Gumi F-term (reference) 2D049 GB05 GE04 GE11

Claims (4)

[Claims] 1. A steel pipe column embedding method in which a steel cage and a steel pipe column are erected in an excavated pile hole and concrete is poured into the excavated pile hole. After inserting the lower end of the column and fixing it by welding or the like, through the steel pipe column, further hang down the reinforced basket,
A method of installing a steel pipe column, wherein a steel cage and a steel pipe column are installed at predetermined positions in a pile hole, and concrete is poured into the pile hole. 2. A socket steel pipe is externally fitted to an upper end portion of a reinforcing steel basket such that an upper end of the reinforcing steel basket is exposed from above, and fixed by welding or the like, and the reinforcing steel basket is overlapped with the socket steel pipe. 2. The method according to claim 1, wherein the lower end of the steel pipe column is inserted and fixed by welding or the like. 3. The steel pipe column according to claim 1, wherein the steel pipe column is provided with a steel pipe column verticality detector and a steel pipe column verticality correction means, each of which is recoverable. Construction method. 4. The steel pipe column according to claim 1, wherein a dummy tube having a release material formed on a surface thereof is disposed inside a casing forming a peripheral wall of the pile hole. Built-in method.