JPH0336366A - Rc construction column and method for constructing rc construction column - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention provides RC@Masumi formwork and a method for constructing RC structure pillars for constructing structural pillars using reinforcing bars to be used in the reverse casting method. Regarding.

<Conventional Technology> The reverse construction method is known as a construction method for constructing underground floors of buildings, etc. An example of this construction method is shown in FIG. 8. When constructing multiple underground floors, cast-in-place piles 82 that will serve as the foundation of the building are driven into multiple vertical holes 81, and then each pile hole 8
A structural pillar 83 is lifted and constructed inside the building by a crane. The structural pillar 83 is formed of a steel pipe, H-shaped steel, or the like, and a bracket for beam connection is attached around the pillar. Next, a reinforced girder is attached between the brackets of these plurality of structural columns 83, and a formwork for the first basement floor is provided in the area surrounded by these plurality of structural columns 83, and concrete is placed inside the formwork. Pour concrete and build the first basement floor.

Furthermore, the ground below is excavated, a formwork for the basement floor below is set up, and concrete is poured into the formwork, which is repeated.
A plurality of underground floors are sequentially constructed from the top to the bottom while supporting the frame 84 with structural pillars.

<Problems to be solved by the invention> However, as mentioned above, the structural pillars used in the conventional reverse hammering method are made of steel, so they are heavy and long. There were drawbacks, such as the need for a large crane during construction, resulting in high costs for both materials and construction. In addition, brackets are attached around the structural pillars, and installation sometimes requires strict accuracy in horizontal, vertical, and rotational directions, resulting in problems such as reduced workability.

The present invention has been made to solve the above-mentioned disadvantages, and its purpose is to reduce the material cost and construction cost for structural pillars used in the reverse casting method, and to provide structural pillars that can improve workability. An object of the present invention is to provide a pillar construction member and a method for constructing a structural pillar using the construction member.

Means for Solving the Problems> The present invention has been made in view of the above object, and its gist is to provide a plurality of column reinforcements arranged in parallel at intervals, and a method for laterally binding the plurality of column reinforcements. An RC structure consisting of a tie reinforcement, a cylindrical formwork that covers the outer periphery of the plurality of column reinforcements bound by the tie reinforcement, and a plurality of beam reinforcement joints that protrude vertically and horizontally around the cylindrical formwork. In the formwork for columns.

Another aspect of the present invention is that a reinforcing bar cage for constructing foundation piles is erected in a pile hole, and the formwork for the RC structure column is vertically joined in plurality and built on the reinforcing bar cage. included,
The present invention provides a method for constructing an RC structure pillar, in which the structure pillar is constructed by pouring concrete into the reinforcing bar cage and the formwork for the RC structure pillar.

<Example> RC structure pillar formwork according to the present invention and RC using the formwork
The construction method of the structure pillar will be explained based on the attached drawings.

As shown in FIGS. 4 and 7, the formwork 10 for a true column of an RC structure according to the present invention has a cylindrical shape, and includes a plurality of column reinforcements 11 arranged in an annular manner at intervals in the lateral direction, and the column reinforcement. hoop reinforcements 12 as ties that laterally bind the columnar reinforcements 11; a cylindrical formwork 13 that covers the outer periphery of the plurality of columnar reinforcements 11 arranged in an annular manner; , and a plurality of beam reinforcement joints 14 protruding vertically and horizontally around the beam.

To create the formwork 10 for the RC structure columns, first, a cylindrical reinforcing bar basket is manufactured by welding the column bars 11 and hoop bars 12 and binding them with wire.The inner center of the reinforcing bar basket is opened and then the reinforcing bar cage is opened. The penetrating beam reinforcement joints 14 are provided in a substantially perpendicular crossing direction. Next, a cylindrical formwork 13 with a spacer is attached to the outer periphery of the cylindrical reinforcing bar cage to complete the process.

Hereinafter, an embodiment of a method for constructing an RC structure main column using the above-mentioned RC structure main column formwork 10 will be explained in the order of steps with reference to FIGS. 1 to 3, and FIGS. 5 and 6.

First, as shown in Fig. 1, pile holes 21 for constructing foundation piles 25 and structural pillars 28 are excavated using the reverse construction method, and the holes are filled with muddy water 23 to prevent the hole walls 27 from collapsing. Next, as shown in FIG. 2, the formwork 10 for the RC structure pillar is wired using a crane or the like. 26, and while jointing the RC structure pillar formwork 10 in the vertical direction by the number of underground floors, lift the pile reinforcing bar cage 2.
Build on top of 2. The joint is formed by welding the column reinforcements 11 together. Furthermore, after removing the slime that has settled in the pile holes 21, as shown in FIG. , and pour concrete into the pile reinforcing cage 22 through the tremie pipe 24. After waiting for the initial hardening of the poured concrete, concrete is poured into the formwork 10 for the RC structure pillar while continuously pulling up the tremie pipe 24, and the RC structure pillar 28 is constructed as shown in FIG.

Furthermore, in order to construct a basement floor of a building using the reverse casting method using the RC structure pillars 28 constructed by this process, first, as shown in FIG. Perform backfilling. Next, a retaining wall 29 is constructed around the planned construction site shown in FIG. Next, the first basement floor of the ground 30 surrounded by the retaining walls 29 is excavated, and the beam reinforcements 14 of each adjacent RC structure pillar 28 exposed by the excavation are replaced with beam reinforcements wrapped around stirrups. A formwork is provided on the jointed beam reinforcements, and concrete is poured into the formwork to construct the first basement floor. moreover,
The above-mentioned steps are repeated by excavating the ground 30 below, and the underground floors of the building are successively constructed from the top to the bottom using the RCa'1c pillars 28.

Effect> According to the present invention, a column reinforcement and a beam reinforcement are integrally formed in a cylindrical formwork to produce a formwork for an RC structure main column, and the formwork for an RC structure main column is vertically Since it will be built in the inner part of the pile while being jointed,
Compared to conventionally used iron pipes, H-beams, etc., it is lighter and easier to handle, and less steel material is required, reducing material costs. In addition, since the joints of the beams are made of reinforcing bars, there is ample space at the joints, which improves workability.

[Brief explanation of drawings]

1 to 6 are schematic cross-sectional views showing the construction process of the RC structure pillar according to the present invention, and FIG. 4 is an IV in FIG. 3.
-IV sectional view, FIG. 7 is a perspective view showing the formwork for RC structure pillars according to the present invention, and FIG. 8 is a sectional view schematically showing the reverse casting method. 10... Formwork for RC structure pillars, 11... Column reinforcement. 12... Hoop 15 (stir bar), 13... Cylindrical formwork, 14
・・Liang reinforcement joint, 21・・Pile hole, 22・・Reinforcing bar cage for piles, 2
5. Foundation pile, 28. Structural pillar.

Claims (1)

[Scope of Claims] 1) A plurality of column reinforcements arranged in parallel at intervals, a tie bar that binds the plurality of column reinforcements in the horizontal direction, and an outer periphery of the plurality of column reinforcements bound by the tie reinforcements. A formwork for a pillar in an RC structure, comprising a covering cylindrical formwork and a plurality of beam reinforcement joints protruding vertically and horizontally around the cylindrical formwork. 2) A reinforcing bar cage for constructing a foundation pile is erected in the pile hole, and a plurality of RC structure column formworks according to claim 1 are jointed in the vertical direction and erected on the reinforcing bar cage, and the reinforcing bar cage and R
A method for constructing an RC structure pillar, characterized by constructing the structure pillar by pouring concrete into a formwork for the C structure pillar.