JPH0565717A - Prefabrication work of reinforcing bar for foundation - Google Patents

Abstract

PURPOSE:To obtain a foundation for machine parts and structures at a low cost in a short time of construction with improved construction efficiency and with a high construction accuray. CONSTITUTION:For a latticed base beam 6, base reinforcing bars 11 are arranged in a prefabricated block frame having an intermediate support 8 and an outside form strut 7 and template 9 and a base bolt 10 are supported to form a prefabricated block A having an outside form 12. in a factory. The blocks A are carried in an excavated trench 2 for constructing base formed in parallel with the production of the block A, and a block-fixing anchor 5 is fixed to leveling concrete 3 placed on the bottom of the trench 2. Base concrete is placed into the block A and cured, and the excavated soil is embedded and consolidated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a prefabricated construction method of a reinforcing bar for a foundation, which is applied to various machine foundations, foundations of steel frame structures, and column foundations such as independent columns of various buildings.

[0002]

2. Description of the Related Art Thermal power plants, turbines of nuclear power plants,
Machines such as generators and condensers, foundations for installation of equipment, and foundations of steel-framed buildings, to prevent uneven settlement after construction,
Even if it is constructed on a solid ground, it has a fairly rigid structure to cope with pulling force and horizontal force.

3 to 6 show a conventional construction process for a foundation of this type, in which a pile landing work such as a concrete pile a or a caisson is carried out, and then a vertical compression or pulling load or a horizontal load is applied to the ground work. Excavation for transmitting power (root cutting)
And a waste concrete c composed of lean-mix concrete (poor mixture concrete) for the bottom of the excavation part b.
Is placed. (Refer to FIG. 4) Next, a basic reinforcing bar d corresponding to the type and structure of the installation machine is arranged on the discarded concrete c, and a form e surrounding the reinforcing bar d is assembled. (See FIG. 5) Then, a template f is provided horizontally on the mold e so as not to cause a deviation between the position of the basic bolt hole on the machine side and the position of the basic bolt arranged on the reinforcing bar d in the mold e. Then, the foundation bolt g extending to the inside of the reinforcing bar in the form is placed. (See FIG. 6) After that, the foundation concrete is poured into the form e for the first time, and after the casting concrete is cured, the mold is removed.
The excavated soil is backfilled and solidified in sequence, and then the installation of the machine is started.

[0004]

In the above-mentioned conventional basic construction method, since the progress of the steps is carried out in series, it is impossible to shift to the next step unless the construction of the previous step is completed. As a result, the period of foundation work will be long, the delay in the work of the previous process will be wrinkled to the post-process, and the post-process will be tight.In addition, there is a limit to the shortening of the construction period for the process to proceed in the order of the process. There are many problems such as being there.

In addition to the construction period, in the case of equipment to be installed in a high place, the work conditions such as a high place, wind and rain, hot air, cold air, etc. should be avoided when setting a template and installing foundation bolts. It cannot be avoided. The present invention has been proposed in view of the above problems of the prior art, the object of which is to improve the workability, the construction accuracy is improved, the construction period is shortened, and the construction cost is reduced. The point is to provide a prefabricated construction method for reinforcing bars.

[0006]

In order to achieve the above-mentioned object, the prefabricated construction method for a reinforcing bar for a foundation according to the present invention is such that a template and an intermediate support for supporting a reinforcing bar are provided in an intermediate portion of a grid-shaped base beam in a factory. The rebar is arranged in the prefabricated block frame, which is provided with the formwork support on the side surface, and supports the template and the foundation bolts installed in the template, and the outside is attached to the formwork support. A prefabricated block is manufactured by mounting a formwork, and the prefabricated block is carried into the excavation part for foundation construction in the local ground. Place it in place and fix it with the block fixing anchors that are placed in the same concrete, and place the foundation concrete in the prefabricated block. And pouring, after curing of the pouring concrete is more configuration and a second step of returning embedding the excavated soil.

[0007]

According to the present invention, as described above, the prefabricated block frame composed of the lattice-shaped base beam, the intermediate support and the form columns is assembled, the reinforcing bars of the foundation are arranged on the block frame, the template is set, and the foundation bolts are fixed. Prefabricated blocks can be manufactured by arranging and mounting the outer formwork in a factory with good working conditions, the manufacturing accuracy is improved, and the blocks can be manufactured in parallel with the local foundation work. .

By loading the prefabricated block thus produced in the factory into the excavation section for local foundation construction, the installation of the prefabricated block can be carried out without any on-site work such as bar arrangement and formwork assembly. It is performed only by centering on abandoned concrete placed on the bottom of the excavated part, fixing it in place by a block fixing anchor placed on the abandoned concrete, and placing concrete concrete.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments shown in FIGS. FIG. 1 shows a cross-sectional view of the foundation work at the machine installation site. The machine installation site is excavated, the pile 1 is placed, and the excavation part 2 around the pile 1 is installed.
Abandoned concrete 3 made of lean-mix concrete is laid on the bottom surface.

A base plate 4 on which a prefabricated block, which will be described later, is placed is arranged on the pile head of the pile 1, and a prefabricated block fixing anchor 5 is fixed to the surrounding concrete 3 to be discarded. The existing work will be the basic work on site. FIG. 2 shows a prefabricated block A, in which a formwork column 7 is erected on the side surface of a base beam 6 formed in a lattice shape by a shape steel, a steel plate or the like, and an intermediate support 8 is erected on the middle portion of the prefabricated block A. Assemble the block frame,
The template 9 is mounted on the intermediate support 8 of the same frame, and the base bolt 10 is arranged at each predetermined position of the template 9.

Around the base bolt 10, a basic rebar 11 having a required amount of rebar is arranged. The foundation rebar 11 also supports the lower portion of the foundation bolt 10 and holds the bolt 10 vertically. Further, various attachment metal parts such as inserts (not shown) are arranged on the block frame, and finally, by attaching the outer mold 12 to the mold support 7,
Prefab Block A is completed.

The above is the rebar work for the foundation in the factory, which is carried out in parallel with the above-mentioned on-site foundation work, and the prefabricated block A manufactured in this way is delivered to the site. In this way, the prefabricated block A that has been carried into the field is lowered to the local excavation section 2 as it is when it was unloaded from the factory, and after the required work such as centering is performed, it is fixed with the prefabricated block fixing anchor 5. .

Next, the foundation concrete is placed in the prefabricated block A and the placed concrete is cured, and then the excavated soil is backfilled and tamping is performed to complete the foundation work. Then, the process shifts to the machine and device installation process.

[0014]

As described above, according to the present invention, since the on-site foundation work and the foundation rebar work in the factory can be performed in parallel, the construction period can be greatly shortened. Furthermore, since the prefabricated block which is not affected by the delay of the previous process and has the frame formed in the block frame in the same manner as the basic rebar, the template and the basic bolt, is manufactured in a factory with good working conditions, Good bar arrangement and foundation bolts are arranged to improve the accuracy of foundation construction, which shortens the construction period and saves the construction cost.

Furthermore, according to the present invention, since the base reinforcing bar portion can be carried in as a prefabricated member to the site, the installation can be centered and the concrete can be placed. It overcomes adverse working conditions such as wind, rain, hot air, and cold air, and enables safe and efficient construction.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a construction situation of an on-site foundation work in an embodiment of a reinforcing bar prefab construction method for a foundation according to the present invention.

FIG. 2 is a side view showing a part of the prefabricated block in a cutaway manner.

FIG. 3 is a vertical sectional view showing a pile driving step in a conventional method.

FIG. 4 is a vertical cross-sectional view showing a root cutting and a waste concrete placing step in the conventional method.

FIG. 5 is a vertical cross-sectional view showing a basic rebar arrangement and formwork assembling process in the conventional method.

FIG. 6 is a vertical cross-sectional view showing an arrangement process of a template and a foundation bolt in a conventional method.

[Explanation of symbols]

 A Prefabricated block 1 Pile 2 Excavated part 3 Discarded concrete 4 Base plate 5 Prefabricated block fixing anchor 6 Base beam 7 Formwork column 8 Intermediate support 9 Template 10 Foundation bolt 11 Foundation rebar 12 Outer formwork

Claims (1)

[Claims] 1. A prefabricated block frame in which a template and an intermediate support for supporting a reinforcing bar are arranged in an intermediate part of a grid-shaped base beam and a formwork support is arranged in a side part in a factory. While arranging, support the template and the foundation bolts arranged in the template,
A prefabricated block is manufactured by attaching an outer formwork to the formwork column, and the prefabricated block is carried into the excavation part for foundation construction in the local ground, the first step, and the prefabricated block is laid at the bottom of the excavation part. Placed at a predetermined position on the discarded concrete, fixed with a block fixing anchor arranged on the discarded concrete, placing basic concrete in the prefabricated block, and after curing the placed concrete, excavation A prefabricated method of reinforcing bars for a foundation, which comprises a second step of backfilling soil.