JPH0754052B2 - Reinforcing bar reinforcement method for foundation slabs - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a reinforcing bar method in which a bending reinforcing bar and a shear reinforcing bar are arranged in a basic slab in a large-scale reinforced concrete structure such as a nuclear power plant. is there.

[Prior art]

Conventionally, the following methods have been generally known as this type of bar arrangement method.

Shear reinforcement reinforcing bar 22 with a hook 21 that is almost U-shaped at the end
Are vertically erected on the foundation slab discard concrete 23. Then, after that, bending reinforcement bars 24 are arranged horizontally in multiple stages. (Refer to Fig. 16) Shear reinforcement steel bar bent at 90 ° to form hook 25
After the bending reinforcing bars 24 are laid out, they are rotated while being dropped into the reinforcing bars from above, and are fixed to the bending reinforcing bars 24 by hooks 25. (Refer to FIG. 17) [Problems to be solved by the present invention] However, in the above-mentioned bar arrangement method, since the reinforcing bar for the foundation slab is large in diameter and heavy, bending reinforcement in the forested shear reinforcing bar 22 is performed. It is difficult to arrange the reinforcing bars 24. Therefore, the construction of the entire foundation slab takes a long time and the foundation slab becomes expensive.

In addition, in the bar arrangement method, when the shearing reinforcing bar 26 is dropped from above the bending reinforcing bar group, it is an obstacle so that the bending reinforcing bar 24, which is a grid-like multi-stage, does not disturb the hook 25. Can not take much of the length. Therefore, each shear reinforcing bar 26 cannot be securely fixed to each bending reinforcing bar 23, and the strength of the entire foundation slab becomes insufficient.

The present invention was created in view of the above-mentioned circumstances, and an object thereof is to provide a reinforcing bar method capable of easily performing bending bar reinforcement and shear reinforcing bar reinforcement in a foundation slab in a short time. .

[Means for solving problems]

According to the reinforcing method of the present invention, after bending reinforcing bars are arranged in a horizontal multi-stage and in a grid pattern, a large number of shear reinforcing screw reinforcing bars are provided in the gap between the grid bending reinforcing bars from above this bending reinforcing bar group. While being dropped vertically, the shear reinforcing screw reinforcing bars are simultaneously locked and fixed to both the uppermost and lowermost bending reinforcing reinforcing bars in the bending reinforcing reinforcing bar group.

Also, the fixing of each of the above-mentioned shear reinforcing screw rebars is provided so that it can be opened and closed in a petal-like manner at the end portion in the direction of the drop, and when the movement in the direction opposite to the direction of the drop is released, it is locked to the bending reinforcement bar. It will be carried out by using a locking tool that prevents it.

Then, each shear reinforcing screw rebar can be locked and fixed to each bending reinforcing rebar by an easy work of vertically dropping the shear reinforcing screw rebar into the bending reinforcing bar group.

Along with this, the bending reinforcing bars can be easily arranged without the respective shear reinforcing screw reinforcing bars being arranged.

〔Example〕

Hereinafter, the arranging method of the present invention will be described with reference to illustrated embodiments.

The screw reinforcing bar 1 for shearing reinforcement, which is used in the reinforcing bar method of the present invention and is vertically dropped into a bending reinforcing bar group that has been horizontally arranged in advance, is formed in a rod shape, and the drop end is formed. The nut 2 is spot-welded to the part. On the nut 2, six locking tools 3 are provided that can be opened and closed in a petal shape. (See FIGS. 4 to 7) In each locking tool 3 here, a ring 4 is welded to the upper end surface thereof, and a string 5 which is not easily broken is passed through the ring 4. The cord 5 has a ring shape so that each locking tool 3 does not open more than 60 ° when opening in a petal shape.

Further, a ring 4 similar to the upper end is welded to the outer peripheral surface of the lower end of each locking tool 3. Then, each locking member 3 is attached to the ring 4.
A ring-shaped rubber string 5 is inserted through which the lower end of the screw rebar is pressed against the outer peripheral portion of the screw rebar 1 to be in a close contact state.

Further, a ring 4 is welded to the lower end of each locking tool 3, and a ring-shaped rubber cord 7 is passed through each. The rubber cords 7 are hooked on the respective nuts 2, and are used to make the lower ends of the respective locking tools 3 closely contact with the upper end surfaces of the nuts 2 and to open the respective locking tools 3 in a petal shape. .

Each locking tool 3 is normally opened in a petal shape by the rubber cord 7, and the outer diameter in the completely opened state is about three times as large as the outer diameter of the screw reinforcing bar 1. There is.

FIG. 6 shows a state in which each locking tool 3 is completely closed. In this way, each locking member 3 has a structure that easily closes when its outer periphery is pushed by an object. And each lock 3
The outer shape in a completely closed state is about twice the outer diameter of the screw reinforcing bar 1.

Next, a reinforcing bar method of the present invention using the shear reinforcing screw reinforcing bar 1 having the above-described structure will be described.

First, the bending-reinforcing bars 8 at the upper and lower ends are arranged in a horizontal multi-stage and in a grid pattern to form a group of bending-reinforcing bars. The work of arranging the bending reinforcing bar 8 can be easily performed because there is no shearing reinforcing bar which is forested as in the conventional case. The spacing between the lattice-shaped bending reinforcing bars 8 arranged in the bar is twice or more the outer diameter of the shear reinforcing screw reinforcing bar 1. (See FIG. 1) Next, the shear reinforcing screw rebars 1 in the state where the six locks 3 are opened in a petal shape are used as the bending reinforcing bar 8,
Drop vertically between 8 (See FIG. 2) At this time, when the locking tool 3 of the shear reinforcing screw reinforcing bar 1 hits the bending reinforcing bar 8, each locking tool 3 is easily closed as shown in FIG. Further, when the space between the lattice-shaped bending reinforcing bars 8 and 8 becomes approximately twice the outer diameter of the screw reinforcing bar 1, the locking members 3 are completely closed.

From this, the locking tool 3, that is, the screw reinforcing bar 1, easily passes between the bending reinforcing reinforcing bars 8, 8.

Next, when the space between the bending reinforcing bars 8 and 8 in the lattice shape is passed and the bending reinforcing bars are penetrated in this manner, the locking tool 3 provided at the tip of the shear reinforcing screw reinforcing bar 1 is made of rubber. The power of the string 7 opens it like a petal. (See FIG. 3) Then, the screw reinforcing bar 1 is lifted as shown in FIG. 3 until the locking tool 3 opened like a petal hits the bending reinforcing reinforcing bar 8 in the lowermost stage.

Next, the fixing plate 9 is attached to the upper end of the lifted screw reinforcing bar 1 as shown in FIG. 1 and placed on the uppermost bending reinforcing bar 8 to prevent the screw reinforcing bar 1 from falling.

Then, the fixing plate 9 is tightened with the nut 10 screwed onto the screw rebar 1, so that the bending reinforcing rebars 8 at the lowermost and uppermost stages,
8 is tightly bound by the petal-like locking portion 3 at the lowermost stage and the fixing plate 9 at the uppermost stage, and the shear reinforcing screw reinforcing bar 1 is fixed. (Refer to FIG. 3) In this way, the work of arranging the bending reinforcing bar 8 and the shear reinforcing screw reinforcing bar 1 is completed.

When the tensile force actually acts on the screw reinforcement 1 after the reinforcement and concrete is placed and the foundation slab is completed in this way, the lowermost bending reinforcement reinforcing bar 8 is further lowered, and the uppermost bending reinforcement is reinforced. The reinforcing bar 8 tries to move further upward.

However, the bending reinforcement reinforcing bar 8 at the lowermost stage prevents the locking tool 3 opened like a petal from going downward. In addition, because concrete is filled around the petal-shaped locking device 3,
Even if the screw rebar 1 is pulled up, it is constrained by concrete and does not move.

As described above, according to the reinforcing bar method of the present invention, the basic slab can be easily installed because the reinforcing bar is simply arranged, and the completed basic slab can be strengthened.

8 to 13 show another mode of the locking tool.

Each locking tool 11 here is provided with its lower end pinned to the upper end surface of a nut 12 having a conical shape. Further, a sliding guide metal piece 13 is provided on the upper end of each locking tool 11, and a support arm 14 is provided via the guide metal piece 13.
One end of is provided slidably. The support arm 14 has one end pinned to a plate body welded to the screw rebar 1. Further, between the nut 12 and the support arm 14, a spring member welded to the screw reinforcing bar 1 and each locking tool 11.
15 are provided.

According to this structure, since the nut 12 has a conical shape, the work of dropping it into the bending reinforcing bar group can be easily performed. In addition, the action of the guide metal piece 13 and the support arm 14 allows the spring member 15 of each locking tool 11 to open and close in a petal shape smoothly and surely.

FIG. 14 and FIG. 15 show another mode of the locking tool.

Each locking tool 16 here is provided with its lower end pinned to the upper end surface of the nut 12 having a conical shape. Note that each locking member 16 is formed so that the lower end surface thereof abuts the upper end surface of the nut 12 when released.

Further, an upper end portion of each locking tool 16 has one end pinned to the screw rebar 1 through the plate body and the other end of the support arm 17 pinned through the plate body. The support arm 17 is expandable and contractible, and the spring member 15 is arranged inside.

By doing so, it is not necessary to newly provide a guide metal member, a spring member, or the like on the screw rebar 1, so that the structure becomes simple and the opening and closing of each locking tool 16 can be performed smoothly. Nut 12
Since the support arm 17 and the support arm 17 are in contact with each other, it is possible to firmly support each locking tool 16 when released.

〔The invention's effect〕

The reinforcing bar method of the basic slab according to the present invention is carried out by first arranging horizontal bending reinforcing bars in a lattice-shaped multi-stage, and then vertically dropping shear reinforcing screw reinforcing bars from above the bending reinforcing bars into the inside thereof. The shear reinforcing screw reinforcing bar used here is characterized in that a locking portion for locking the bending reinforcing reinforcing bar at the lowermost stage is provided at the end portion in the dropping direction.

And the locking part provided at the end of each shear reinforcement screw rebar in the direction of drop is openable and closable in a petal shape, and the movement of the screw rebar in the direction opposite to the direction of drop is bent when opened. It is configured to prevent it by locking it to the reinforcing steel bar.

Therefore, even if the grid-shaped rebar spacing of each bending reinforcement bar is narrow to about twice the diameter of the shear reinforcement screw reinforcement, if the petals are closed, the shear reinforcement screw reinforcement will be used with the locking device installed. Can be dropped into the group.

Also, since this locking part has a petal-like open shape,
It is possible to securely lock the shear reinforcing screw reinforcing bar to the horizontal lowermost bending reinforcing bar by an easy work by simply dropping it vertically into the bending reinforcing bar group.

For these reasons, the work of fixing the shear reinforcing screw reinforcing bar in the bending reinforcing bar group can be performed easily and in a short time, so that the bending reinforcing bar can be arranged first. This means that the work of horizontally arranging the bending reinforcing bars can be easily performed in a short time because the conventional vertical reinforcing shear reinforcing screw reinforcing bars can be omitted.

And from the above, according to the method of the present invention, since the reinforcement of the bending reinforcing bar and the shear reinforcing screw reinforcing bar can be easily performed in a short time, the construction of the entire basic slab can be easily performed in a short time. It can be offered at a low price.

[Brief description of drawings]

1 to 3 are process drawings showing the reinforcing bar method of the present invention, FIG. 4 is a front view showing the tip end portion of the shear reinforcing bar used in the reinforcing bar method of the present invention, and FIG. 5 is FIG. A-A line sectional view of
6 is a front view showing a state in which the locking tool shown in FIG. 4 is closed, FIG. 7 is a sectional view taken along the line BB of FIG. 6, and FIG. 8 is a front view showing another mode of the locking tool. Fig. 9 is a sectional view taken along the line CC of Fig. 8, Fig. 10 is a front view showing a state in which the locking tool shown in Fig. 8 is closed, and Fig. 11 is DD of Fig. 10. FIG. 12 is a sectional view taken along line EE of FIG. 10, FIG. 13 is a sectional view taken along line FF of FIG. 10, and FIG.
FIG. 15 is a front view showing a state in which the locking tool shown in FIG. 14 is closed, and FIGS. 16 and 17 are sectional views showing a conventional bar arrangement method. 1 ... Shear reinforcing screw rebar, 2 ... Nut, 3 ... Locking tool, 4 ... Ring, 5 ... String, 7 ... Rubber string, 8 ... Bending reinforcing bar, 9 ... Fixing plate, 10 …… Nut, 11 …… Locking tool, 12 …… Conical nut, 13 …… Guide hardware, 14 ……
Support arm, 15 ... Spring member, 16 ... Lock, 17 ... Support arm.

Claims (1)

[Claims] 1. After arranging bending reinforcing bars in a horizontal multi-stage and in a grid pattern, a large number of shear reinforcing screw reinforcing bars are vertically arranged from above the bending reinforcing bar group in a space between the bending reinforcing bars in a grid pattern. At the same time as dropping, each of the shear reinforcing screw reinforcing bars is locked and fixed to both the uppermost and lowermost bending reinforcing reinforcing bars in the bending reinforcing reinforcing bar group, and the fixing of each shear reinforcing screw reinforcing bar is performed by the dropping. It is provided at the end of the direction in a petal-like manner so as to be openable and closable, and the movement in the direction opposite to the drop direction is performed by using a locking tool that locks and blocks the bending reinforcing bar when opening. Reinforcing bar reinforcement method for foundation slab.