JP2722116B2 - Installation method of slab reinforcement network - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method of arranging a lower end bar and an upper end bar using a slab reinforcing net in a block defined by beams, and more particularly, to a welding metal net. This is related to a construction method devised to minimize the number of types.

[Conventional technology]

As a method of arranging a lower end bar and an upper end bar in a block partitioned by beams, there are a hand-assembled reinforcing bar method in which hands are assembled on site, and a welding wire mesh arranging method in which a welding wire mesh is used.

[Problems to be solved by the invention]

In the hand-arranged reinforcing method, the dimensional accuracy is low despite the time required for reinforcing and tying, and the tying is not strong.
There is a disadvantage that the joint is troublesome and labor man-hour is increased.

On the other hand, the welding mesh layout method can solve the above-mentioned drawbacks, however, among the blocks divided by beams, the assignment of the welding mesh differs between the end block and the central block, and if the span is different. Since the vertical and horizontal dimensions of the welded wire are different, various types of welded wire are required. Therefore, a large stock space is required, the construction is troublesome, and the construction efficiency is deteriorated.

The present invention has been made in order to solve the drawbacks of the above-described ordinary hand-arranged reinforcing wire construction method and the welding wire meshing construction method that requires various kinds of welding wire meshes, and minimizes the types of the welding wire meshes. It is a skillful combination of welding wire laying method and hand-arranged reinforcing method so that it can be held down.

[Means for achieving the task]

The construction method according to the present invention includes the following lower-bar arrangement process and upper-bar arrangement process.

Here, the lower end bar arranging step is a single welded net welded at intersections of vertical and horizontal reinforcing bars arranged orthogonally in a block defined by beams, or a welded net to be arranged there. Laying a plurality of pieces by dividing, and at a portion corresponding to the central portion of the block, between the meshes between the reinforcing bars parallel to the beams on the short sides of the welding wire mesh, facing each other. Arranging a reinforcing bar shorter than the inner dimension between the long side beams in parallel with the short side beams.

Further, the upper end bar arranging step is, in a block defined by beams above the lower end bar, a welded wire mesh obtained by welding each intersection point of vertical and horizontal reinforcing bars arranged so as to be orthogonal to each other at an end of a short side. A process of arranging on a beam such that a mesh portion protrudes to some extent from a short side beam facing the beam to a certain extent, and a single welded wire mesh obtained by welding each intersection of vertical and horizontal reinforcing bars arranged orthogonally. Alternatively, a plurality of welded metal meshes to be disposed therein may be divided into a plurality of pieces so that the ends of the meshes protrude to some extent on the long-sided beams, and the mesh portions protrude to some extent on the long-sided beams facing the beams. Arranging, welding between at least two of the meshes between the reinforcing bars parallel to the short side beams of the two welding wire meshes located on the long side beams and facing each other, at least these two pieces; Arranging a reinforcing bar having a length extending over the wire mesh in parallel with the beam on the short side; Process in the portion corresponding to the center portion of the serial block parallel to the beam of a short Rebar long side than inner dimensions of the block, and has a.

As described above, the lower end bar arranging step in the present invention employs the above-described welded wire arranging method and the above-described hand-arranged reinforcing bar arranging method. , And the above-described hand-arranged bar construction method.

[Action]

 The operation of the present invention will be described with reference to the drawings showing the embodiments.

Due to the step of arranging the lower end bar, for example, as shown in FIG. 2, one welding wire mesh (4) is provided in the block shown in FIG. If there is a block (A ') exceeding the standard size of the reinforcing bar, a single wire mesh to be provided is divided into a plurality of pieces (4a) and (4b), and Further, in a portion corresponding to the center of both blocks (A) and (A '), a reinforcing bar (6) indicated by a dotted line in FIG. Will be arranged.

Next, in the step of arranging the upper end bar, the block (B) [FIG. 6] corresponding to the upper part of the block (A) in FIG. 1 is welded except for the central portion thereof, for example, as shown in FIG. A block (B ') in which a wire mesh (8) or (8') is provided, and which has a larger span than the block (B) above the block (A) in FIG. If one exists, for example, as shown in FIG. 7, one welded wire mesh to be disposed there is divided into a plurality of pieces (8a), (8b) or (8a '), (8b). ') Are provided. Blocks (B) which are blank between the reinforcing bars parallel to the short side beams of the two welded metal meshes positioned on the long side beams and facing each other, that is, the blanks in FIG. And at the center of (B ')
A vertical reinforcing bar (9) indicated by a dotted line in FIG.
In this figure, a horizontal reinforcing bar (10) indicated by a dotted line is arranged.

In this way, for example, the lower end streaks as shown in FIG.
Block (B) partitioned by beams above the lower muscle
Alternatively, in (B ′), for example, an upper end streak as shown in FIG. 10 is provided.

By the way, in order to arrange the lower end streaks and the upper end streaks in exactly the same manner as in the case of the present invention without using the method according to the present invention, various types of welding meshes are required as shown in FIGS. 11 and 12. And For example, the blocks (A) (FIG. 1) and the blocks (B) (FIG. 6) above them among the blocks divided by beams are provided with reinforcing bars for slabs in the same manner as in the embodiment of the present invention. In the case of arranging the mesh, three types of welding meshes (C ₁ ), (C ₂ ), and (C ₃ ) are required as shown in FIG. (D ₁ ), (D ₂ ), (D ₃ ), (D ₄ ),
(D ₅₎ is required five welded wire mesh called. However, when the laying method of the present invention is used, only one type of welding wire mesh shown in FIG. 2 (4) is required for the lower reinforcement, and in FIG. 7)
Only two welded meshes indicated by (1) and two welded meshes indicated by (8) and (8 ') are sufficient, and the other portions are supplemented by, for example, reinforcing bars indicated by reference numerals (6), (9) and (10). be able to.

As described above, when the laying method of the present invention is used, the number of welding metal meshes required for arranging the reinforcing steel net for slabs by the conventional welding mesh layout method can be reduced. In addition, since the number of welding wire meshes used is small, the stock space can be reduced, and the time required for construction can be reduced.

〔Example〕

Embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In arranging the slab reinforcing bar network in the block defined by the beams, the block shown in FIG. 1 (A) or (A ') is provided with a lower end bar, and the blocks (A), (A),
An upper streak must be provided in the block above (A ') (indicated by (B) or (B') in FIG. 6). For example, as shown in FIG. 1, the block (A) or (A ') is composed of a long side beam (1), a short side beam (2), and a column (3), and the block (B) above the block (B). ) Or (B ') is composed of a long side beam (1), a short side beam (2) and a column (3) as shown in FIG. Arrange the streaks. The blocks (A), (A ') and (B), (B') are long beams (1) and short beams (2).
Even in the case where only the upper and lower muscles are provided, there is no difference between the lower end muscle arrangement step and the upper end muscle arrangement step.

 The process of arranging the lower muscle is as follows.

First, in a block (A) [FIG. 1] divided by a long side beam (1), a short side beam (2) and a column (3),
A single welded wire mesh (4) is welded at the intersections of the vertical and horizontal reinforcing bars (41) and (42) arranged orthogonally [Fig. 2], and is indicated by (5) in Fig. 5. A streak (indicated by a dotted line) is arranged on the long side beam (1), and its protruding portion, that is, the portion projecting into the block (A), and the end of the welding wire mesh (4) are bound or welded. Establish and become one. In addition, when there is a block larger than the block (A) as shown by (A ') in FIG. 1, that is, the lateral reinforcing bar (42) having a large span exceeds the fixed length of the material. In the case of a very large block, the welding wire mesh to be disposed there is divided into a plurality of pieces [(4a), (4
b)] is provided. Then, as in the process on the small block (A) side, the reinforcing bar (5) is arranged on the long side beam (1), and is divided into its protruding portion, that is, the portion protruding in the block (A '). To fix the ends of the plurality of welded metal meshes (4a) and (4b).

Next, at portions corresponding to the central portions of the blocks (A) and (A '), the welding wire meshes (4), (4a), (4
b) Longitudinal beams (1) facing each other between meshes between the longitudinal reinforcing bars (41) and (41) parallel to the short-side beams
A reinforcing bar (6) shorter than the inner dimension between (1) is arranged parallel to the short-side beam (2) as shown by a dotted line in FIG. Then, any one of the plurality of reinforcing bars (42) in the lateral direction of the welding wire meshes (4), (4a), and (4b) is fixed to the reinforcing bar (6).

Thus, the block (A) or (A ') divided by the long side beam (1), the short side beam (2) and the column (3)
Next, as shown in FIG. As shown in FIG. 2, the mesh pitch of the welded metal meshes (4), (4a), and (4b) in the illustrated example is, as shown in FIG. The pitch between the parallel longitudinal reinforcing bars (41), (41)] Px is the mesh pitch in the long side direction [the horizontal reinforcing bars (42), (4) parallel to the long side beam (1)]
2) The pitch between them is about twice Py, and the reinforcing bar (6) is made of a welded wire mesh (4), (4a), (4b).
Are arranged at the same pitch as the mesh pitch Px in the short side direction.

In the embodiment, as shown by (a) and (a ') in FIG. 1, the load bearing area of the lower end muscle is independent of the effective span lx, lx' on the long beam (1) side. In both the long side direction and the short side direction, the effective span ly of the short side beam (2) side is determined by ly / 4 which is almost 1/4 of the effective span ly. In the hatched portions (a) and (a ') corresponding to the central portion of the block, the reinforcing bars are arranged densely.

An upper end bar is provided in the block (B) or (B ') defined by a beam above the lower end bar. The process of arranging the upper end bar is as follows.

A block (B) defined by a long side beam (1), a short side beam (2) and a column (3) above the lower end muscle.
In FIG. 6, a welded wire mesh (7) obtained by welding the intersections of the vertical and horizontal reinforcing bars (71) and (72) arranged so as to be orthogonal to each other.
As shown in FIG. 7, the end portions are arranged on the short side beam (2), and the mesh portion is extended from the beam (2) to the opposite short side beam (2) to some extent. Set up. In the case of the example shown in the drawing, the effective span ly on the short side beam (2) side is extended by about 1/4, that is, ly / 4. Here, 1/4 of the effective span is, for example, 3000 m
m, the mesh is 200mm, the diameter of the rebars (71), (72) is 13mm, and if the strength has a margin, select 600mm; otherwise, select 800mm. It is not necessary, and there may be some variations in implementation.

In the embodiment, both longitudinal beams (1) and (1) facing the reinforcing bar (71) in the longitudinal direction of the welding wire mesh (7) are straddled.

Next, the vertical and horizontal reinforcing bars (8
The welded wire mesh (8) obtained by welding the intersections of (1) and (82)
As shown in the figure, the long side beam (1) whose end side is on the long side beam (1) and whose mesh portion faces the long side beam (1).
It is arranged so that it overhangs to some extent. In the case of the illustrated example, the effective span ly of the short side beam (2) side is protruded by about / 3/3, which is 3 of the effective span ly. In FIG. 7, the portion indicated by (8 ') has a vertical reinforcing bar (811) which extends over two blocks (B) and (B) appearing vertically in FIG. An example of a case where a large-sized welded wire net is formed by using a wire twice as long as that of (81) of 8). However, this portion may be replaced with two welded metal meshes (8) and (8).

On the other hand, when there is a block larger than the block (B) as shown by (B ') in FIG.
That is, in the case of a large block in which the span is large and the horizontal reinforcing bar (82) exceeds the fixed length of the material, a plurality of pieces of the welding wire mesh to be disposed therein are divided [No.
As shown in FIG. 7, (8a) and (8b) in the figure] are shown in FIG. 7, and the long side of the end faces the beam (1) and the mesh portion faces the beam (1). It is arranged so as to overhang the beam (1) to some extent. In the case of the illustrated example, the effective span ly on the short side beam (2) side is 1/3 thereof.
It is overhanging about y / 3. In FIG. 7, (8
Regarding the portions indicated by a ′) and (8b ′), the vertical reinforcing bars (811) have the same shape as that of the welded meshes (8a) and (8b) as in the case of the welded mesh (8) in the block (B). 8
An example of a case where a large-sized welded metal mesh is formed by using a wire having a length twice as long as 1) will be described. However, this portion may be replaced with two welded metal meshes (8a) and (8b).

And, two welded metal meshes (8) and (8 '), (8') and (8 ') and (8a) and (8a') which are located on the long side beam (1) and face each other. (8a ') and (8
a '), (8b) and (8b'), (8) and (8), and (811) and (811) parallel to the short-side beam (2) of (8b ') and (8b').
A reinforcing bar (9) having a length straddling the beams (1) and (1) on the long sides facing each other is provided between each mesh between the meshes (11) and (10).
As shown by the dotted line in the figure, the short side beam (2) is arranged in parallel. In the embodiment, a case is shown in which the length spans between the long-sided beams (1) facing the reinforcing bar (9) and (1), but the length is two welded metal meshes (8). And (8 '),
(8 ') and (8') and (8a) and (8a '), (8a')
And (8a '), (8b) and (8b'), (8b ') and (8b'), and a plurality of long side beams (1) and (1). It may have a long length. Then, the welding wire meshes (8), (8 '), (8a), (8b),
Any one of the large number of reinforcing bars (82) in the horizontal direction of (8a ') and (8b') is fixed to the reinforcing bar (9).

In addition, at a portion corresponding to the center of the blocks (B) and (B '), a reinforcing bar (1
0) is the long side beam (1) as shown by the dotted line in FIG.
And placed in parallel. Then, any one of the above-described numerous longitudinal reinforcing bars (9) is fixed to the reinforcing bar (10).

Thus, the block (B) or (B ') divided by the long side beam (1), the short side beam (2) and the column (3)
Then, as shown in FIG. It should be noted that the welding wire meshes (8), (8 '), (8a), (8
As shown in Fig. 7, the mesh pitch of b), (8a '), and (8b') is the mesh pitch in the short side direction at most of them (the vertical reinforcing bar parallel to the short side beam (2)). (81), (81)
Or, the pitch between (811) and (811)] Px is the mesh pitch in the long side direction [the horizontal reinforcing bar (8
2), (82)] is approximately twice as large as Py, and the above-described longitudinal reinforcing bars (9) and (10)
Are welded metal meshes (8), (8 '), (8a), (8b), (8
a ') and (8b') are arranged at the same pitch as the mesh pitch Px in the short side direction.

In the embodiment, as shown by (b) and (b ') in FIG. 6, the load bearing area of the upper end muscle is independent of the effective spans lx and lx' on the long beam (1) side. The long side direction is almost 1 / the effective span ly on the short side beam (2) side.
4 and ly / 3, the short side direction of which is almost one third of the length, ly / 3 is illustrated. The reinforcing bar network for the lower end muscle is shown by the shaded portions (b) and (b ′). The arrangement of the reinforcing bars is made denser at the portion corresponding to the end of the block than at the center of the block.

In the above-described embodiment, the case has been described in which the lower streak and the upper streak are disposed in a specific block having a long side in the horizontal direction and a short side in the vertical direction. The present invention can be applied to a case where the lower end muscle and the upper end muscle are arranged in the above block. Also, even if the length of each part is slightly changed in the length, size, and mesh pitch, it naturally belongs to the scope of the present invention.

〔The invention's effect〕

According to the present invention, since the welded wire mesh is used for the main portions of the lower reinforcement and the upper reinforcement disposed in the block partitioned by the beam, the dimensional accuracy of the reinforcement is accurate, and the allowable stress is reduced. The higher the degree, the less the reinforcement is disturbed when placing concrete, and the construction is simpler than when using only ordinary hand-arranged reinforcement. Therefore, the number of labor steps can be reduced, and a high level of skill is not required. Furthermore, it can eliminate the disadvantages of requiring various types of welded meshes, so that a large stock space is not required, and the number of types of welded meshes is reduced, so that the layout design and construction can be rationalized and labor-saving. Efficiency is also improved, and in addition, manufacturing costs can be reduced. In addition, it is possible to shorten the construction period. As a result, the total cost, which can be called the ultimate purpose, can be reduced.

[Brief description of the drawings]

1 to 10 of the accompanying drawings show an embodiment of a method for arranging a reinforcing steel bar for a slab according to the present invention. FIG. 1 is a plan view showing a load bearing area of a lower end bar, FIG. Is a plan view showing a state in which a welding wire mesh for a lower rebar is arranged on a block defined by beams by a welding wire meshing method. FIGS. 3 and 4 show the arrangement of the welding wire mesh shown in FIG. FIG. 5 is a front view and a right side view, FIG. 5 is a plan view showing a state in which a lower reinforcing bar is arranged by combining the welding wire layout method and the hand-arranged reinforcing method shown in FIG. 2, and FIG. FIG. 7 is a plan view showing the load-bearing area of the streaks. FIG. 7 is a plan view showing a state in which a welded wire mesh for upper-end streaks by a welded wire meshing method is arranged in a block defined by beams. FIG. 8 and FIG. Is a front view and a right side view showing an arrangement state of the welding wire mesh shown in FIG. 7, and FIG. 10 is a welding view shown in FIG. FIG. 11 is a plan view showing a state in which upper end bars are arranged by combining the net layout method and the hand-arranged reinforcing method, and FIGS. 11 and 12 show the practice of the present invention without using the method shown in the embodiment of the present invention. In arranging the lower reinforcement and the upper reinforcement just as in the case shown in the example, a plan view for explaining that various types of welding wire meshes are required as compared with the case of the present invention, FIG. FIG. 11 shows the case of the lower muscle, and FIG. 12 shows the case of the upper muscle. (1), (2) ... beam, (4), (4a), (4b) ... welded wire mesh, (6) ... rebar, (7), (8), (8 '),
(8a), (8b), (8a '), (8b') ... welded mesh,
(9), (10) ... Rebar, (A), (A '), (B),
(B ') Block.

Claims (1)

(57) [Claims] In a block defined by beams, one welding wire mesh obtained by welding each intersection point of vertical and horizontal reinforcing bars arranged so as to be orthogonal or a welding wire mesh to be provided thereat is divided into a plurality of pieces. And the step of laying the thing, between the meshes between the reinforcing bar parallel to the short side beam of the welding wire mesh at the portion corresponding to the center of the block and the reinforcing bar, between the opposing long side beam A step of arranging a reinforcing bar shorter than the inner dimension in parallel with the beam on the short side, and a step of arranging the lower and upper bars, A step of arranging a welded wire mesh obtained by welding the respective intersections of the reinforcing bars so that the ends thereof are on the short-sided beams and the mesh portions project to some extent from the beams to the short-sided beams facing the beams. Vertical,
A single welded wire mesh obtained by welding each intersection point of a horizontal reinforcing bar or a welded wire mesh to be disposed thereon is divided into a plurality of welded wire meshes. A process of arranging the reinforcing wire parallel to the short-side beam of the two welded wire meshes positioned on the long-side beam and facing each other so as to protrude to some extent from the beam to the long-side beam facing the same. A step of arranging a reinforcing bar having a length straddling at least these two welded metal meshes in parallel with the short-sided beam, between the meshes between the meshes; A method of arranging a reinforcing bar network for a slab, comprising: a step of arranging a reinforcing bar shorter than the inner dimension of the reinforcing member in parallel with the long side beam;