JPS63272847A - Method of reinforced concrete construction by plate reinforcement - 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] [Field of Industrial Application] The present invention relates to reinforced concrete and reit structures, and in particular, by arranging punched plate reinforcing bars in a cross-shaped structure, the number of man-hours required for assembling the reinforcing bars can be reduced. This invention relates to a reinforced concrete construction method using plate reinforcement suitable for reducing the weight and improving the ease of carrying into blocks.

[Conventional technology]

Conventional reinforced concrete structures arrange bar-shaped main reinforcing bars according to the required strength, fix the main reinforcing bars using bar-shaped or band-shaped reinforcing bars, and temporarily secure the reinforcing bars by binding them together using wires, etc. , concrete was being poured.

However, these structures require an extremely large amount of time and effort to assemble the main reinforcing bars and rod-shaped or band-shaped reinforcing bars at the construction site, resulting in inefficiency and problems as described in Japanese Patent Publication No. 50-85125. Regarding a reinforced concrete structure corresponding to a beam or a column, it has a main reinforcing bar and a recessed part in which the main reinforcing bar is fixed, and is equipped with a stirrup in which a plurality of the recessed parts are integrally formed by combining a lattice,
A reinforced concrete structure characterized by having these main reinforcing bars and stirrups buried in concrete has been proposed.

However, this structure still uses rod-shaped reinforcing bars as the main reinforcing bars, and no consideration was given to reducing the number of structural members.

In general, most of the conventional techniques used are the former technique.

[Problem that the invention seeks to solve]

However, the former of the above conventional techniques arranges bar-shaped main reinforcing bars according to the required strength, fixes the main reinforcing bars using bar-shaped or band-shaped reinforcing bars, and temporarily fixes the reinforcing bars by binding them together using wires, etc. However, this structure required an extremely large amount of time and labor to assemble the main reinforcing bars and rod-shaped or band-shaped reinforcing bars at the construction site, resulting in inefficient work. It is something, etc.

There were the following problems.

(1) Prepare rod-shaped reinforcing bars of various thicknesses, first arrange the lower main reinforcing bars, then install vertical auxiliary bars, arrange the upper main reinforcing bars, and then tie the reinforcing bars together using wire. The construction procedure of temporary fixing and finally pouring concrete is for the foundation mat section or horizontal slab section.
Since this procedure was carried out at the construction site, it was extremely primitive, required a large amount of construction time and labor, and was inefficient.

(2) In order to improve the construction work environment, one possible improvement method is to assemble the reinforcing bars in a work yard other than the installation area, form blocks and hang them in the installation area, connect the necessary parts, and pour concrete. However, the procedure for assembling reinforcing bars to form blocks remains a primitive method.

In addition, the latter of the above-mentioned conventional technologies includes a main reinforcing bar, a stirrup that has a recessed part in which the main reinforcing bar is fixed, and a plurality of the recessed parts integrally formed by a lattice combination. Although it is slightly more advantageous in terms of construction work and economy than previous technologies, this structure still uses rod-shaped reinforcing bars as the main reinforcing bars, and
Since it does not take into account the disappearance of the number of component parts, etc.
There was a problem shown below.

(1) This structure is intended for reinforced concrete structures that correspond to beams or columns due to the nature of the shape of each member and its assembled shape, and its scope of application in general buildings is extremely limited. Become. That is, in a general building, columns and beams account for about 15%, and the rest is the foundation mat, horizontal slab, ceiling, walls, etc.

(2) This structure is composed of main reinforcing bars and a stirrup that is a combination of a recessed part and a lattice part, but a stirrup that combines a recessed part and a lattice part according to the required size costs one member. becomes relatively expensive.

Moreover, the shape of the joints between the unit structures becomes complicated, and as a result, it does not contribute much to reducing the number of man-hours for reinforcing bar assembly work.

The purpose of this invention was to solve the above-mentioned problems, and to reduce the weight of reinforcing bars and the number of man-hours for assembling reinforcing bars, and to replace the reinforced concrete construction method using plate reinforcement, which is easy with the block construction method. It is to provide.

[Means for solving problems]

In order to achieve the above object, the reinforced concrete construction method using plate reinforcement of the present invention uses plate reinforcement having assembly grooves and concrete flow holes in a reinforced concrete structure made of steel and concrete. This is a characteristic feature.

[Effect]

According to the above configuration, during assembly, there is no need to bind the reinforcing bars to each other using wires or the like, and the assembly can be easily performed by fitting the grooves together, thereby improving assembly efficiency.

In addition, the assembled plate reinforcement can be easily moved and installed using a crane or the like, improving work efficiency and shortening the construction period.

Furthermore, during concrete pouring, the flow holes allow the concrete to be sufficiently filled and bonded, and the weight of the plate reinforcement is also reduced.

In addition, the effective cross-sectional area of plate reinforcement is smaller than that of rod-shaped reinforcing bars with the same section modulus, so sufficient strength against bending can be obtained even with a small amount of reinforcing bars, thereby reducing costs and work man-hours.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings. Note that structural parts that are the same as those of the conventional reinforced concrete construction method are given the same reference numerals and their explanations will be omitted.

As shown in FIGS. 1 and 2, the reinforced concrete construction method using plate reinforcements 1 of this embodiment basically consists of a plurality of punched plate reinforcements 1 having punched holes 2 and matching grooves 3 through which concrete flows. It is composed of a cross-shaped combination structure and concrete 4.

Figure 1 shows an example in which the present invention is applied to a foundation mat part and a horizontal slab, and has punched holes 2 provided for the purpose of sufficiently filling and bonding concrete and further reducing the weight of reinforcing steel members. In addition, a plurality of punched plate reinforcements 1 provided with matching grooves 3 for plate reinforcements with only the ends oriented in opposite directions are assembled in a parallel cross shape to constitute the reinforcement arrangement of the reinforced concrete structure.

The effective cross-sectional area of the Δ portion plane and the depth of the mating groove 3 shown in FIG. 2 shall be set to values that sufficiently satisfy the strength, according to the type, direction, and magnitude of the design load. In other words, as a characteristic of reinforced concrete structures, concrete has a compressive strength (approximately 100 kg/al), but almost no tensile strength can be expected, and when a tensile load is applied, most of it must depend on the tensile strength of the reinforcing bars. Therefore, the strength of the punched plate reinforcement 1 is designed to withstand tensile loads.

In addition, regarding the arrangement spacing of the punched plate reinforcements 1, the relationship with the effective cross-sectional area of the punched plate reinforcements 1 is clarified according to the type, direction, and magnitude of the design load, and the most rational number of rows, that is, the arrangement spacing is determined. It determines the

Furthermore, in FIG. 2, the shape of the deepest part of the mating groove 3 of the punched plate groove 1 is rounded to reduce stress concentration, which is advantageous in terms of strength. In addition, the shape 2 position and size of the punched hole 2 are not limited to a round shape, and the manufacturing amount can be set to a low-cost condition, thereby making it possible to suppress member costs.

Next, the operation of this embodiment will be explained.

The main features of this embodiment are the following three points: reduction of component costs, significant reduction in man-hours for reinforcing steel foundation work, and facilitation of the block construction method.The technical details of each are shown below. .

(1) Reducing the amount of parts For example, the diameter of the rod-shaped reinforcing bar is d = 10 na, the width of the plate reinforcement is b = 5 nm, and the effective height is h = 15. ．． When comparing the area and section modulus assuming 7 mm, it is found that the bending strength of the plate reinforcement is about twice that of the bar-shaped reinforcement with the same area at the neutral axis. Also from this point of view, it is possible to reduce the amount of parts. Furthermore, by standardizing and mass-producing plate reinforcements, costs can be reduced compared to conventional deformed steel bars.

(2) Reduction of man-hours for reinforcing steel foundation work For example, 1.1 million kilowatt class nuclear power generation plan 1-1
The amount of architectural reinforcing bars used per unit is approximately 51,000 tons, and roughly converting this to the number of reinforcing bars is φ25 m.
When the average shape is X 5 m.

51.000/ (-(2,5)" x 500 x
7. &5 x 10-') 2,647,041, resulting in reinforcing bar assembly work involving approximately 2.65 million deformed steel bars.

To deal with the enormous amount of work shown above, we adopted plate-shaped reinforcing bars with sufficient concrete filling and circulation holes and assembly grooves to reduce the weight of the reinforcing bars, and placed plates at intervals commensurate with the load value in the loading direction. Simply arrange the reinforcements, place the upper plate reinforcements for the lower plate reinforcements in the diagonal and orthogonal directions, for example in the shape of a grid, and fit them into the preset assembly grooves to create the required reinforcement shape. , it is possible to significantly reduce the number of man-hours required for reinforcing steel foundation assembly work.

In this case, by creating plate reinforcements in a standard shape in advance and combining them, it is possible to correspond to various design strengths, which not only reduces the number of man-hours required for ground assembly work, but also simplifies the production and management of plate reinforcements. It can be carried out.

(3) Facilitation of the block construction method When assembling reinforcing bars into the ground, work can be done easily even in a somewhat narrow installation area, but if it is necessary to further improve the environment for reinforcing reinforcing bars, For example, in a work yard or indoors other than the installation area for floor slabs, walls, ceilings, etc., assemble the reinforcing bars in the form of parallel bars, etc., and then transport the reinforcing bars with plate reinforcements assembled to the vicinity of the installation area, and use a lifting machine to By suspending the device within the installation area, it is possible to reduce the number of man-hours and shorten the construction period.

In addition, when transporting or lifting a block plate reinforcement structure, the diagonal 4
It can be moved just by supporting the points, and it is also advantageous for lifting and lowering operations when blocks are formed.

Furthermore, by welding the assembled plate reinforcements or tightening bolts using auxiliary members such as flanges, it is possible to form a rigid L block according to the situation.

(Other Example 1) The example shown in Fig. 1 is the most basic arrangement shape of the punched plate reinforcements 1, and the reinforcement arrangement shape under the design condition that the tensile force acts in directions perpendicular to each other on a two-dimensional plane. However, under design conditions where the load acts only in one direction, the strength is satisfied by simply arranging the punched plate reinforcements 1 having the designed cross-sectional area parallel to the load direction at the designed intervals. do.

As a result, in the direction perpendicular to the direction of the main reinforcing bars, only the auxiliary member for positioning the punched plate reinforcing bars 1 serving as the main reinforcing bars needs to be used, resulting in a structure in which the amount of reinforcing bars can be halved.

(Other Embodiment 2) The embodiment shown in Fig. 1 is the most basic arrangement shape of the punched plate strips 1, but when the thickness of the foundation mat or horizontal slab becomes large, it may be possible to combine them in a grid pattern. A composite structure can be created in which the structures of the punched plate reinforcements 1 are stacked in multiple stages.

In this case, by employing the auxiliary plate reinforcements 5 shown in FIG. 1 to maintain the spacing between each stage, it is possible to use vertical reinforcements and save the effort of fixing the plate wires or fixing them by welding.

(Other Embodiment 3) The basic structure of this embodiment shown in FIG. 1 is intended for horizontal parts such as foundation mats and horizontal slabs.

By arranging this basic structure perpendicular to the horizontal plane, application to a wall surface is also easily possible.

(Other Example 4) One of the punched plate striations 1 combined in a grid pattern is processed into an arc shape of an appropriate size in the longitudinal direction of the plate striations 1,
By arranging and combining the other radially, it can be applied to circular foundation mats, horizontal slabs, etc. For example, it is applied to foundation mats and horizontal slabs of reactor buildings in nuclear power plants.

〔Effect of the invention〕

As described above, according to the present invention, plate reinforcement having assembly grooves and concrete flow holes is used in the reinforced concrete 1 structure made of steel and concrete, so the following effects are obtained. be able to.

(1) By simply combining the same type of plate reinforcing bars in a cross-shaped pattern, it is possible to replace the conventional rod-shaped reinforcing bars with different diameters, reducing member costs.

Furthermore, standardization and mass production of punched plates can further reduce component costs.

(2) The reinforcing bar assembly work involves simply assembling the plate reinforcement and connecting the necessary parts, and compared to the conventional technology, it is possible to reduce the number of work steps by a large amount.

(3) In addition, since the reinforcing bar assembly work becomes easier, for example, the reinforcing bar is made into large blocks in a work yard other than the installation area, and then transported and installed in bulk using a construction tower crane, etc. Recruitment becomes easier.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the present invention, FIG. 2 is a side view of a punched plate strip, and FIG. 3 is a plan view showing a conventional technique.
FIG. 4 is a sectional view showing the prior art. 1... Punched plate stripes, 2... Punched holes, 3...
- Matching groove, 4... Concrete, 5... Auxiliary plate reinforcement, 6... Upper deformed steel bar, 7... Lower deformed steel bar, 8... Auxiliary deformed steel bar, 9... Binding wire.

Claims (1)

[Scope of Claims] 1. A reinforced concrete construction method using plate reinforcement, characterized in that plate reinforcement having assembly grooves and concrete flow holes is used in a reinforced concrete structure made of steel and concrete. 2. The construction method according to claim 1, wherein the plate reinforcements are assembled in a cross-shaped structure and arranged on the floor slabs, walls, ceilings, etc. of the structure. 3. The construction method according to claim 1 or 2, wherein the plate reinforcements are created in advance in a standard shape and are combined according to the designed strength of the structure.