JPH0410954B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a method for assembling reinforcing bars for reinforced concrete structures.

"Conventional Technology" In recent years, reinforced concrete construction has been attempted for high-rise residential buildings with 25 to 30 floors for reasons such as shortening the construction period and reducing construction costs. In this case, the most suitable method for assembling the reinforcing bars is the pre-assembly method, in which column reinforcing bars and beam reinforcing bars are assembled into the ground in advance.

This pre-assembly method also includes the center joint method,
There are the girder composite method and the two-layer prefabricated column method.The center joint method uses ground assembly to construct a girder reinforcing cage corresponding to the length of half the span from the middle of the column reinforcing cage of the length per floor. This is a construction method in which a required number of beam-column units protruding from two to four directions are assembled, and these units are erected and connected one after another for construction (for example, Japanese Patent Publication No. 53-29938). This is a method in which column reinforcing bar cages and partial girder reinforcing bar cages for each floor, in other words, column units and girder units, are assembled using ground assembly, and these are erected one after another and combined (for example,
7253, Japanese Patent Publication No. 58-19392), the two-layer prefabricated column method consists of assembling the necessary number of column reinforcing cages with a length equivalent to the second floor as a column unit, and placing them next to each other on the first floor. This is a construction method in which the buildings are built at different positions up and down, staggered, and then connected (for example, Japanese Patent Publication No. 13690/1983).

``Problems to be solved by the invention'' However, these pre-assembled construction methods focus on assembling reinforcing bars for each floor, and lack consideration for the structure as a whole. However, since there are structural mechanical weaknesses in the joints of the column units and the intersections between the column units and the girder units, it would be difficult to maintain structural strength if they were adopted as they were for high-rise residential buildings with 25 to 30 floors. It is still insufficient.

Therefore, the present invention aims to rationally utilize the advantages of these pre-assembled construction methods to create an excellent structure as a whole and to solve the conventional problems.

"Means for Solving the Problems" The present invention forms a column reinforcing bar cage with a length equivalent to a second floor, and also extends a girder reinforcing bar cage with a length equivalent to one-half span from the middle of the column reinforcing bar cage in two to four directions. Form a girder reinforcing bar cage equivalent to double span with the protruding beam column unit, and connect girder reinforcing bar cages equivalent to half span from both ends of the girder reinforcing bar cage to one or both sides. Assemble the required number of protruding girder units, place the beam-column units next to each other on the first floor, shift their positions vertically, and erect them alternately. Alternately compose into units and combine them as a whole.

Further, as the corner girder unit, a girder unit in which girder reinforcing bar cages corresponding to a half span protrude in an L-shape in both directions is used.

``Function'' With the above configuration, the number of joints equivalent to columns of beam-column units is reduced to once per second floor, and the number of joints between girders between girder units and beam-column units is reduced to once per two spans. These connecting parts alternate between adjacent beam units, and the connecting parts between the columns of the beam-column units and the girder units also alternate, and all beam-column units are connected to each other by the adjacent girder units. Therefore, the mechanical strength of the structure as a whole is rationally increased by compensating for the weak points of the connecting portions.

"Example" The drawings illustrate embodiments of the invention.

In FIGS. 1 and 2, 1... is a beam-column unit made of ground assemblies, 2... is a girder unit made of ground assemblies, and 3 is pre-concrete consisting of omnia slab and cast-in-place concrete.

As shown in the schematic explanatory diagram of FIG. 3, the beam-column unit 1 has three types: 1a for the inside of the frame, 1b for the peripheral wall, and 1c for the corner. From the middle of the bridge, girder reinforcing cages 12 corresponding to one-half span are protruded on four sides, three sides, and two sides, respectively.

As shown in Fig. 3, the girder units 2 are: 2a for the inside of the frame, 2b for the peripheral wall, and 2c for the corner.
The internal type 2a and the peripheral wall type 2b are two types, in which the girder reinforcing bar cage 22, which is equivalent to one-half span, is moved in two directions from a position equivalent to one-half span from both ends of the girder reinforcing bar cage 21, which is equivalent to double span. A total of four pieces, two pieces in one direction, are protruded, and the corner 2c is formed into an L-shape using only the girder reinforcing bar cage 22 that is equivalent to a half span.

As shown in FIG. 4, the column reinforcing bar cage 11 includes a plurality of column main reinforcements 111... and a large number of welded lattice hoops 112...
It consists of incorporating.

In addition, as shown in FIG.
21..., auxiliary reinforcements 122, 212, 222..., and a large number of stirrups 123, 213, 223....

As shown in Figures 1, 2, and 3, these units are lifted by a crane 4, temporarily supported by temporary supports 5, and erected. Adjacent column units 1 are built alternately on the first floor and shifted in position up and down, and correspondingly girder units 2 are alternately combined with these beamed units and connected integrally.

For the connection, the reinforcing bars are mechanically connected to each other using mechanical joints 6 such as threaded joints and sleeve joints.
Further, for convenience of connection, hoops and stirrups are not provided at or near the connecting portion of each unit, but are assembled later.

To lift the beam-column units 1 with the crane 4, for example, a lifting jig 7 shown in FIGS. 6 to 8 is used. This hanging jig attaches frames 71 and 72 to be attached to the upper and lower parts of the beam column unit using wires
3 and 73, and furthermore, a wire 74 and a pulley 7
5, the lower frame 72 is removably clamped to the column reinforcing bars 111 of the unit with bolts/nuts 721 and clamping bars 722, and the upper frame 71 is detachably fitted loosely into the column reinforcing bars 111 of the unit. In this case, in use, a plurality of hoops 1 are installed at or near the connecting portion.
The hoops 112a can be easily assembled by holding them in the lower frame 72, and then removing the lower frame and pulling down the hoops after connection. In addition, a plurality of hoops 11 are connected to the lower unit to be connected.
2a... may be fitted in advance, and then pulled up and assembled after connection.

Although not shown, in order to lift the girder unit 2 with the crane 4, there are steps such as tying both ends of a plurality of wires to appropriate locations on the unit, applying pulleys to these wires, and engaging the pulleys with the crane 4. It is advisable to use a hanging means that does not apply excessive force to any part of the unit. In this case as well, it is preferable to appropriately fit the stirrup to be incorporated into the connecting portion or its vicinity in advance, and to move it to a predetermined position after connecting to knit.

Onia slabs are connected to the reinforced steel structure thus assembled on each floor, and concrete is poured.

"Effects of the Invention" According to the present invention, the assembled reinforcing bars as a whole are extremely rational in terms of structural mechanics, and the strength of the frame is increased, so that it can be used in super high-rise residential buildings of 25 to 30 floors without any problems.

In addition, post-assembly work and related work can be greatly reduced, reinforcement can be placed faster, construction time can be significantly shortened, reinforcement accuracy can be improved, quality accuracy can be ensured, and pre-assembly of reinforcing bars can be standardized. Aim to stabilize man-hours,
It can bring about the stabilization of the labor force.

[Brief explanation of drawings]

The drawings show embodiments of the invention, FIGS. 1 and 2.
The figure is an explanatory diagram of the construction method, Figure 3 is a schematic explanatory diagram, and Figure 4 is an explanatory diagram of the construction method.
The figure is a cross-sectional plan view of the column reinforcing bar cage, FIG. 5 is a vertical cross-sectional side view of the girder reinforcing bar cage, FIG. 6 is a side view of the lifting jig in use, and FIGS. 7 and 8 are respectively FIG. 3 is an enlarged plan view of the main parts of the jig. 1... Column unit with beam, 2... Beam unit, 3... Leading concrete, 4... Crane, 5
...temporary support, 6...joint, 7...hanging jig,
11... Column reinforcing bar cage, 12, 21, 22... Beam reinforcing bar cage, 111... Column main reinforcement, 112... Welding grid hoop, 121, 211, 221... Beam main reinforcing bar, 12
2,212,222...Auxiliary muscle, 123,21
3,223... Starap.

Claims (1)

[Scope of Claims] 1. A beam-equipped column unit that forms a column reinforcing bar cage with a length equivalent to a second floor, and has a large beam reinforcing bar cage that is equivalent to one-half span from the middle of the column reinforcing bar cage projecting in two to four directions. and a girder unit in which a girder reinforcing bar cage equivalent to a double span is formed, and a girder reinforcing bar cage equivalent to a half span is protruded from both ends of the girder reinforcing bar cage from a position of one-half span to one or both sides. , assemble the required number of bases, place the beam-column units next to each other on the first floor, shift their positions vertically, and erect them alternately, and correspondingly, combine the girder units with those beam-column units alternately. A method of assembling reinforcing bars for reinforced concrete structures that is characterized by integrally joining them. 2. A reinforcing bar assembly method for a reinforced concrete structure according to claim 1, wherein a girder unit in which a girder reinforcing bar cage corresponding to a half span protrudes in an L-shape in two directions is used as a girder unit at a corner.