JPH07102767A - Method of treatment construction of vertical jointing of surface of successive pour of reinforced-concrete constructed slab - Google Patents

Abstract

PURPOSE:To prevent the generation of the damage of a wire gauze and the outflow of concrete and cement paste even when vibrations required when precedently placed concrete is placed are applied by reinforcing the wire gauze by using a steel rod with a leg and a frame body, on which a wire gauze having dense meshes is mounted. CONSTITUTION:A lower jointer 9 displaying the boundary surface of the jointing of successive pours is installed horizontally to the bottom forms of a slab, and a steel rod with legs consisting of one steel rod 2 and a plurality of the legs 3 is set up horizontally to the bottom forms along the lower jointer 9. A lower end reinforcement 10 is arranged so as to pass a section just above the legs 3, and bound with the steel rod 2 and fixed, and an upper end reinforcement 11 is arranged in parallel with a section just above the lower end reinforcement 10. A frame body consisting of a plurality of vertical steel rods 5, one horizontal steel rod 7 and a wire gauze 6 having dense meshes is inserted from an upper section along the steel rod with the legs, and the horizontal steel rod 7 is bound with the upper end reinforcement 11 and fastened, thus forming the vertical surface of the wire gauze 6. The wire gauze is installed additionally to a section 12, on which no wire gauze is mounted and which is surrounded by the upper end reinforcement 11, the lower end reinforcement 10 and the two vertical steel rods 5. Accordingly, the concrete performance of the surface section of the jointing of successive pours can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating a vertically sewn joint surface at the time of reinforcing work of a reinforced concrete slab.

[0002]

2. Description of the Related Art As a method of constructing a vertical striking surface when splicing a reinforced concrete slab, a partition formwork that combines a plywood board and a splint is provided, and then precast concrete is placed and then the partition formwork is used. There is a method to remove and post-cast concrete, but this method is not preferred because it takes time to remove the partition formwork under the reinforcing bar. In order to save the labor of removing the partition form, a wire mesh with a coarse mesh is used as a temporary partition, and the method of embedding this wire mesh in concrete is currently adopted.

[0003]

In the conventional method of embedding a wire mesh in concrete, since a wire mesh having a coarse mesh is used as a partition for the vertical joint surface, it goes without saying that the wire mesh used when the precast concrete is placed. In order to prevent the flow of concrete and cement paste from the meshes and the gaps between the reinforcing bars, it is necessary to reduce the vibration applied to the concrete.
For this reason, the density of the precast concrete at the joint surface remains low, and the post-cast concrete is placed there, so the concrete performance of the joint surface part is inferior to that of the other parts, and eventually the joint boundary. The continuous performance in terms of surface becomes poor.

Further, the strength of the wire mesh is weak and the concrete is often broken by the pressure of the concrete, and the concrete often flows out.

[0005]

According to the present invention, the strength of the wire mesh as a whole is increased by reinforcing the wire mesh by a frame body in which steel rods are combined and by making the mesh of the wire mesh dense, and It solves all the problems at once.

That is, according to the present invention, after the steel rods with legs are arranged horizontally along the piecing joint surface and fixed to the bottom formwork, the upper end bar and the lower bar are arranged, and a plurality of bars are arranged. Except for a part of the frame surface consisting of vertical steel rods and one horizontal steel rod connecting them, a frame body to which a dense mesh is attached is inserted from above along the legged steel rods. The vertical striking surface treatment method for a reinforced concrete slab is characterized in that a vertical plane is formed and a wire mesh is additionally installed in a portion where the wire mesh is not installed in the vertical plane.

The most important point of the present invention is to use a steel rod with legs and a frame to which a dense mesh is attached to reinforce the mesh and provide the vibration necessary for placing the precast concrete. Even so, the point is to prevent damage to the wire mesh and leakage of concrete and cement paste.

By the construction method of the present invention, the precast concrete in the splicing portion can be sufficiently filled, so that the concrete performance of the splicing portion is equal to that of the other portions and continuous performance does not deteriorate.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

FIG. 1 shows an example of a steel rod with legs and a frame body used in the present invention. (A) is an elevation view of the steel rod with legs, (b) is a side view of the steel rod with legs, and (c). 8A is an elevation view of a frame body, FIG. 8D is a side view of the frame body, and FIG. 8E is an elevation view of a frame body having another structure.

The steel rod with leg 1 has one steel rod 2 and a plurality of legs 3.
And the intersections are spot welded. The mounting interval of the legs 3 to the steel rod 2 corresponds to the reinforcing bar arrangement interval penetrating the striking face.

The frame body 4 is composed of a plurality of vertical steel rods 5, one horizontal steel rod 7 and a wire mesh 6, and the intersections of the vertical steel rods 5 and the horizontal steel rods 7 are spot-welded. The vertical steel rods 5 are arranged so that the intervals between them are narrow and wide, and the horizontal steel rods 7 are arranged while maintaining the intervals.
It is spot welded to. The wire net 6 is attached to almost the entire frame surface on the opposite side of the horizontal steel rod 7, but below the middle horizontal steel rod 7 on the surface surrounded by the two vertical steel rods 5 and the horizontal steel rods 7 with a narrow interval. Not attached. (C) shows a pair of vertical steel rods 5 and 5 at both ends in the longitudinal direction in the frame body 4 used in the middle portion of the connecting surface.
(E) is one in which the vertical steel rods 5 are not provided at both ends in the longitudinal direction of the frame body 4 used in the middle portion of the splicing surface. The upper joint bar 8 is preferably attached to the upper end of the frame body 4.

The construction procedure of the present invention will be described with reference to FIG.

2A and 2B show a vertical splicing boundary surface on which the present invention is applied. FIG. 2A is a vertical sectional view and FIG. 2B is a vertical sectional view orthogonal to FIG.

(1) The lower joint bar 9 showing the connecting boundary surface is horizontally attached to the bottom mold of the slab.

(2) The legged steel rod 1 is horizontally attached to the bottom mold along the lower joint rod 9. This attachment is performed by nailing the leg 3 to the bottom formwork, and the attachment interval of the leg 3 to the steel rod 2 is made to coincide with the reinforcement arrangement interval of the reinforcing bar penetrating the connecting surface as described above.

In FIG. 2 (b), the leg 3 is fixed to the bottom formwork so as to straddle the lower joint rod 9, but if the leg 3 is along the lower joint rod 9, the leg 3 is pre-cast concrete side or post-cast. It does not matter if it is mounted slightly closer to the concrete side.

(3) The legged steel rod 1 also serves as a spacer for the lower end bar 10, and the lower end bar 10 is laid out so as to pass right above the leg 3 and is bound and fixed to the steel bar 2. The upper end streak 11 is arranged parallel to the upper end of the lower end streak 10.

(4) The frame 4 is inserted from above so as to be along the steel rod 1 with legs, and the horizontal steel rod 7 is bound and fixed to the upper end streak 11. The horizontal steel rod 7 pushes the upper end streak 11, and the upper part of the frame body 4 also serves as a spacer for the upper end streak 11. Frame 4
As described above, there is a part where the wire mesh 6 is not attached, and since the part passes through the upper end streak 11 and the lower end streak 10, the frame body 4 can be easily inserted, and the vertical striking surface This means that the wire mesh 6 is installed in most of the parts. Since it is not preferable that the end portion of the wire net 6 is exposed on the concrete surface, it is preferable that the lower end of the wire net 6 is connected to the lower joint bar 9. The same applies to the upper end of the wire net 6, and it is preferable that the upper joint rod 8 is attached to the upper end of the frame body 4 in advance or the upper joint rod 8 is attached after installation.

(5) Part of the frame body 4 where the wire netting 6 is not attached, that is, the upper end streak 11, the lower end streak 10, and the part 12 surrounded by the two vertical steel bars 5 are provided with the vertical steel bars 5. The wire mesh is attached and the work for one frame 4 is completed.

(6) The frame body 4 has a length of about 50 cm to 300 cm, and it is impossible to install the wire netting 6 over the entire width of the joining surface with one frame body 4, and the frame body 4 is set in the longitudinal direction. It is necessary to install while connecting to. Therefore, the frame body 4 shown in FIG. 1 (c) and the frame body 4 shown in FIG. 1 (e) are alternately used in the widthwise central portion of the joining surface. At this time, it is preferable that the ends of the wire nets 6 not supported by the vertical steel rods 5 be connected to the vertical steel rods 5 of the adjacent frame bodies 4.
Further, regarding the frame body 4 used at the widthwise end portion of the joining surface, the horizontal steel rods 7 and the upper joint rods 8 are extended to the side formwork side,
The wire net 6 is also extended and attached. In this case, it is preferable that the side end of the wire mesh 6 is also connected to the side form via a side joint bar, as in the case of the bottom form.

In this way, the frame 4 is installed over the entire width of the splicing surface, and the above steps (1) to (5) are repeated to complete the work.

Whether to repeat the work for one frame 4 to complete the whole or to perform (2) to (5) after performing the above (1) over the entire width of the splicing surface, Depending on the situation, the above (1) to (6) are for convenience of explanation, and the latter is more common.

[0024]

【The invention's effect】

(1) The wire mesh is reinforced by using a steel rod with legs and a frame body to which a tightly meshed wire mesh is attached. Also, since there are almost no gaps, the precast concrete at the splice part is sufficiently filled. The concrete performance of the splice part is equivalent to that of the other parts, and the continuous performance does not deteriorate.

(2) Since the steel rod with legs and the frame body also serve as the spacers for the lower end bar and the upper end bar, it is not necessary to separately arrange the spacers.

[Brief description of drawings]

1 shows an example of a steel rod with legs and a frame body used in the present invention, (a) is an elevation view of a steel rod with legs, (b) is a side view of a steel rod with legs, and (c) is FIG. 6 is an elevation view of the frame body, (d) is a side view of the frame body, and (e) is an elevation view of the frame body having another configuration.

FIG. 2 shows a vertical splice boundary surface on which the present invention is applied,
(A) is a vertical cross-sectional view, (b) is a vertical cross-sectional view orthogonal to (a).

[Explanation of symbols]

1 ・ ・ Steel rod with legs, 2 ・ ・ Steel rods, 3 ・ ・ Legs, 4 ・ ・ Frames, 5 ・ ・ Vertical steel rods, 6 ・ ・ Wire mesh, 7 ・ ・ Horizontal steel rods, 8 ・ ・
Upper joint bar, 9 ... Lower joint bar, 10 ... Lower end bar, 11 ...
Upper end streak, 12 ... No wire mesh installed.

Claims (1)

[Claims] 1. A steel rod with legs is arranged horizontally along a piecing joint surface and fixed to a bottom formwork, and then an upper end bar and a lower end bar are arranged to form a plurality of vertical steel bars. Except for a part of the frame surface consisting of one horizontal steel rod that connects them, a frame body with a dense mesh is attached from the upper side along the steel rod with legs so that the vertical plane of the mesh is A vertical striking surface treatment method for a reinforced concrete slab, which is characterized in that a wire mesh is additionally formed in a portion where the wire mesh is not installed in the vertical plane.