JP2002037583A - Jig for holding steel cage - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To improve the efficiency of the work of suspending and positioning a reinforcing cage in a steel pipe. SOLUTION: A fixing fitting 4 and a pair of hanging and fixing pieces 5, 5 are provided on a plate 2 having main reinforcing through holes 3A to 3L for positioning through a main reinforcing rod 101 of a reinforcing cage 100.
And the main bar 101 passed through the main bar through holes 3A, 3D, 3G, and 3J is fixed to the plate 2 by the fixing bracket 4, so that the hanging and position holding jig 1 is connected to the rebar cage 1
00, the reinforcing cage 100 is hung into the steel pipe 110 by a crane using the hanging holes 5B of the hanging and fixing piece 5, and the hanging and fixing piece 5 is bolted to the steel pipe 110 side to position the reinforcing and reinforcing cage 100. And the position is maintained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jig for holding a reinforcing rod and a car.

[0002]

2. Description of the Related Art Conventionally, a concrete-filled steel pipe structure (CFT structure) is widely used, for example, when constructing columns of a plurality of floors in a high-rise building. CF
The T structure has a structure in which a steel pipe having a cylindrical or rectangular tube shape is fixed on a foundation, and then concrete is poured into the inside of the steel pipe from an upper end opening thereof, and the inside of the steel pipe is filled with concrete. Therefore, bending and buckling of the steel pipe due to the load of the structure can be suppressed by the filled concrete, and the filled concrete increases the shear strength of the joint between the column and the beam.
In addition, since the steel pipe can be used as a substitute for the formwork for placing concrete, it is not necessary to install the formwork, and the number of steps and the construction period can be reduced, and the cost can be reduced. ing.

[0003] However, since the steel pipe serves as a substitute for the formwork and also bears the stress applied to the column, the steel pipe needs to be specially manufactured to have a thickness corresponding to this, and it is expensive. Has become. In addition, since only the concrete is filled inside the steel pipe, if the diameter of the steel pipe increases, the area of the steel pipe in the cross section decreases, the restraining effect of the concrete by the steel pipe decreases, and the strength of the filled concrete increases. This causes a problem that it is difficult to perform the operation.

In order to solve the above-mentioned problems, a reinforcing steel cage is hung in a steel pipe from an upper end opening of a steel pipe fixed on a foundation, positioned, and then poured concrete is poured from an upper end opening of the steel pipe. A reinforced concrete filled steel pipe structure (RCFT structure) is conceivable. Since the RCFT structure is a structure that also bears stress on the reinforcing steel, the thickness of the steel pipe can be reduced, and the cross-sectional area can be reduced, so that the restraining effect of the steel pipe on concrete is not weakened. It can be expected to increase the strength of the filled concrete.

[0005]

However, the RCF
In the case of adopting the T structure, a step of suspending a reinforced car by a crane or the like from an upper end opening into a long steel pipe is required, and thus a step of hanging a suspended wire on the reinforced car is required. In addition, concrete must be cast after suspending the reinforcing steel basket in the steel pipe, and the main reinforcing bars must be held at the specified positions until the cast concrete reaches the specified strength. Need. As a result, there is a problem that the working efficiency has to be lowered and the cost has to be increased. SUMMARY OF THE INVENTION An object of the present invention is to provide a rebar cage suspending / positioning jig that can solve the above-described problems when a rebar cage is provided on a steel pipe.

[0006]

A feature of the present invention to solve the above-mentioned problem is that a reinforcing steel cage is also used for suspending a reinforcing steel cage from an upper end opening of a steel pipe and holding the steel cage in a predetermined position. A position holding jig, wherein a plate is provided with a plurality of main reinforcement through holes for passing through and positioning the main reinforcements of the rebar cage and concrete placement holes for concrete placement. A fixing bracket for fixing the passed main bar to the plate, and a pair of hanging and fixing pieces fixed to the plate for use in lifting the plate and fixing to the upper end opening; And a piece for adjusting and lifting the steel pipe (erection piece) at the same bolt position.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a plan view showing an embodiment of a rebar cage hanging / positioning jig according to the present invention, and FIG. 2 is a side view thereof. 1 and 2, when constructing a column having an RCFT structure, a hanging cage is hung by a crane or the like from the upper end opening of a steel pipe to a predetermined position. It is a jig used for holding.

In the present embodiment, the hanging and holding position holding jig 1 is used for hanging and holding a correspondingly assembled cylindrical reinforcing steel cage in a steel pipe having a circular cross section. And a plate 2 made of a steel plate. The plate 2 is in the form of a ring plate 21 having a concrete casting hole 21A for pouring concrete into a steel pipe. Plate 2
The main plate through holes 3A to 3L for positioning through the main bars of the reinforced car are formed in the ring plate 21 so as to correspond to the positions of the main bars of the reinforced car. Here, since it is used when 12 main reinforcements are arranged at an interval of 30 °, the main reinforcement through holes 3A to 3L are similarly 3 holes.
Twelve are spaced at 0 ° intervals.

The main reinforcement passed through the main reinforcement through holes 3A to 3L is
In order to fix to the plate 2 every other, the main muscle through hole 3A,
Fixtures 4 are provided corresponding to 3D, 3G, and 3J, respectively. Each of these fixing brackets 4 is arranged so as to be aligned with the corresponding main muscle through hole, so that the ring plate 2
1 is a metal sheath tube 41 fixed by means such as welding.
And a tip bolt 42 screwed to the sheath tube 41 to fix the main muscle passed through the sheath tube 41 to the sheath tube 41. Note that the number of the fixing brackets 4 is not limited to four, and it is needless to say that the fixing brackets 4 can be appropriately provided at necessary places. Also,
It is also possible to prevent the main bar from dropping by tightening and fixing the ring plate 21 with upper and lower nuts (not shown) using the main bar as a screw reinforcing bar.

After the main reinforcements are passed through the main reinforcement through holes 3A to 3L, the four main reinforcements are fixed thereto by the fixing fittings 4, thereby lifting the plate 2 in a state where the reinforcing cage is fixed by a crane or the like, and opening the upper part of the steel pipe. In order to be able to position and hold the rebar basket
A pair of hanging and fixing pieces 5, 5 are attached to the plate 2.

Each of the hanging and fixing pieces 5, 5 is an L-shaped steel plate, and the inner corner 5A is
To the plate 2 so as to face the peripheral portion 2A of
It is fixed at appropriate intervals by welding or other appropriate means. The hanging and fixing piece 5 has a hanging hole 5B for attaching a shackle in the case of wire hanging, and a bolt through hole 5C for screwing and fixing the plate 2 to an erection piece previously fixed to a steel pipe. Are provided.

Next, referring to FIG. 3, the reinforcing cage 100 is lifted by using the hanging / position holding jig 1, and the reinforcing cage 100 is suspended from the upper end opening 110 A of the cylindrical steel pipe 110. An example of a method for holding the data at a predetermined position will be described.

The reinforcing bar 100 is formed by spirally winding a spiral bar 102 around twelve main bars 101 arranged circularly at intervals of 30 °. In FIG.
01 shows only six of the twelve.

First, the twelve main bars 101 are inserted into the main bar through holes 3A to 3L of the plate 2 of the hanging / position holding jig 1.
The main bar 101 passed through the main bar through holes 3A, 3D, 3G, and 3J is fixed thereto by the fixing bracket 4, whereby the plate 2 is fixedly attached to the reinforcing bar cage 100. This fixation is performed by connecting the main muscle 101 to the corresponding sheath tube 4.
The main bar 101 inserted through the sheath tube 41 is pressed and fixed to the sheath tube 41 by tightening a sword point bolt 42 provided on the sheath tube 41. In this way, main bar 1
01 is fixed to the hanging and holding position holding jig 1,
The rebar cage 100 is fixed to the hanging and holding position holding jig 1.

Next, the rebar cage 100 fixed to the hanging and holding position holding jig 1 as described above is placed inside the steel pipe 110 using the hanging and holding position holding jig 1 by a crane (not shown).
In this case, wires are hooked on the hanging holes 5B, 5B of the hanging and fixing pieces 5, 5, and the reinforcing cage 100 is lifted using the hanging and holding position holding jig 1, and is hung from the upper end opening 110A of the steel pipe 110. .

In this manner, the reinforcing cage 100 is connected to the steel pipe 11.
Plate 2 of hanging jig 1 that hangs inside 0
Is placed on the upper end opening 100A of the steel pipe 110,
The bolt through holes 5C and 5C of the suspension pieces 5 and 5 fixed to the plate 2 are aligned with the bolt through holes 112A and 112A provided in the pair of erection pieces 112 and 112 fixed to the steel pipe 110 in advance. And bolt it. As a result, the plate 2 and the upper end opening 110A of the steel pipe 110 are defined in a predetermined positional relationship, and the reinforcing cage 100 is accurately positioned at a predetermined position in the steel pipe 110, and at the same time, the reinforcing cage 100 is It will be held firmly in this position.

Thereafter, by pouring the concrete into the steel pipe 110 from the concrete casting hole 21A, the reinforcing cage 100 can be fixed at a predetermined position in the steel pipe 110. When the cast concrete reaches a predetermined strength, the hanging and position holding jig 1 is removed from the reinforced car 100.

In the above embodiment, the twelve main bars 101 are provided at equal intervals of 30 ° so as to form a circular shape. If the shape of the plate 2 and the main-bar through holes 3A to 3L are manufactured according to the shape of the steel pipe 110 and the position and number of the main bars 101, any steel pipe can be used. If the cross-sectional shape of the steel pipe is square, the shape of the plate 2 can be a square or a rectangle according to the cross-sectional shape.

[0020]

According to the present invention, as described above, the rebar cage can be easily suspended, and at the same time the rebar cage is hung inside the steel pipe, and the rebar cage is installed and held at a predetermined position. Since it can be easily installed, the work efficiency of the construction can be remarkably improved, and the installation accuracy of the reinforcing cage can be improved, so that construction of uniform quality can be expected.

[Brief description of the drawings]

FIG. 1 is a plan view showing an example of an embodiment of a hanging and position holding jig according to the present invention.

FIG. 2 is a side view of the hanging and position holding jig shown in FIG. 1;

FIG. 3 is an explanatory view for explaining suspension and positioning and holding of a reinforcing cage using the hanging and position holding jig shown in FIGS. 1 and 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Suspension and position holding jig 2 Plate 3A-3L Main reinforcement through hole 4 Fixing metal 5 Suspension and fixing piece 5B Suspension hole 5C, 112A Bolt through hole 41 Sheath tube 42 Sword point bolt 100 Reinforcing cage 101 Main reinforcement 110 Steel tube 112 Erection piece

Claims (1)

[Claims] 1. A rebar cage hanging / position holding jig for suspending a rebar cage from an upper end opening of a steel pipe and holding the rebar cage at a predetermined position, wherein the jig passes through main bars of the rebar cage respectively. A plate provided with a plurality of main reinforcement through holes for positioning and a concrete placement hole for concrete placement; a fixing bracket for fixing the main reinforcement passed through the main reinforcement through hole to the plate; A position-holding jig for suspending a reinforcing steel cage, comprising a pair of suspending / fixing pieces fixed to the plate for lifting the plate and fixing the plate to the upper end opening.