JP3002742B2 - Reinforcement support structure to formwork - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for supporting a reinforcing bar on a formwork.

[0002]

2. Description of the Related Art For example, when a concrete structure such as a building is to be constructed by a reverse striking method, as shown in FIG. The underground 16 is excavated to form an underground space 15, and a discarded concrete 17 serving as a temporary floor for building a frame is cast on the ground 16 in the underground space 15. The beam form 20 is assembled so that the beam bottom form 1 is placed on the temporary floor made of the discarded concrete 17 via the spacer 18.

[0003] When the screw rebar 4 having the coupler 2 attached to the lower end thereof by the nut 5 for splicing is arranged in the beam form 20, it is necessary to lock the coupler 2 to the beam bottom form 1. . As a method of locking the coupler 2, conventionally, for example, as shown in FIG. 7, two plywood plates serving as beam bottom forms 1 are superimposed and a mounting hole 3 having an outer diameter of the coupler 2 is formed only in the upper plywood plate. The lower part of the coupler 2 is inserted into the mounting hole 3 and locked to the beam bottom formwork 1. And
After the concrete is poured into the beam formwork 20 and the concrete is solidified, the concrete is removed as shown in FIG. 6 and the screw reinforcing bar 4a is screwed into the lower portion of the coupler 2 and joined to the upper screw reinforcing bar 4.

[0004] As another method of locking the screw rebar to the beam bottom form, a hole corresponding to the rebar diameter is formed in a plywood forming the beam bottom form, and the screw rebar is removed with a bolt through this hole. Some are mounted directly on plywood.

[0005]

In order to fix the coupler 2, a mounting hole 3 must be formed in the plywood to be the beam bottom form 1 each time. In addition, it is necessary to mark out each of the mounting holes 3 while dividing the pitch by the interval of the screw rebars 4 to be performed, which requires time and effort for a form carpenter.

[0006] If the accuracy of the drilling of the mounting hole 3 is not good, a concrete mouth may go around in the coupler 2, which may hinder the work of screwing the reinforcing bar 4 connected to the lower part into the coupler 2.

Further, the plywood in which the mounting holes 3 are opened cannot be diverted, and wastes materials.

[0008] In the method of directly fixing the screw reinforcing bar to the plywood, similarly to the method of fixing via the coupler 2,
Holes must be drilled in the plywood to be the beam bottom formwork,
In addition, in order to form the holes, it is necessary to mark the holes for each hole while dividing the pitch by the interval between the threaded reinforcing bars to be provided, which requires time and effort for a form carpenter.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned disadvantages of the prior art, to reduce the time and labor required for inking, to improve workability, and to eliminate the need for mounting holes for fixing couplers and screw rebars. The object of the present invention is to provide a reinforcing bar support structure for a formwork that can effectively utilize materials, prevent the entrance of concrete mouth into the coupler, and do not hinder the screwing of the reinforcing bar later. .

[0010]

According to the present invention, in order to achieve the above-mentioned object, a plate-like support member having a plurality of insertion projections for a coupler protruding at appropriate intervals is mounted on an upper surface of a bottom of a mold.
The lower part of the coupler with the reinforcing bar attached to the insertion protrusion is inserted to support the reinforcing bar with the supporting member, and the supporting member is formed in a long and thin strip-shaped main body, and can be separated at appropriate intervals in the length direction. The gist of the present invention is that a notch is formed, and the outer diameter of the insertion protrusion is equal to the inner diameter of the coupler.

According to the first aspect of the present invention, the coupler and the reinforcing bar are mounted on the bottom mold by simply inserting the lower portion of the coupler into the insertion projection formed on the support member. Because it can be fixed to the frame,
The positioning of the support member is sufficient only for positioning the black ink and the reinforcing bar at the end, and the pitch is not required, so that the workability is improved and the accuracy is improved.

Further, since the mounting hole of the coupler need not be formed in the formwork plywood, the formwork plywood can be diverted.

According to the second aspect of the present invention, in addition to the above-described operation, the length between the insertion projections can be adjusted by separating the support member at the cut portion, and the pitch at which the reinforcing bars are arranged can be flexibly adjusted on site. Can respond.

According to the third aspect of the present invention, in addition to the above operation, the outer diameter of the insertion projection is formed to be equal to the inner diameter of the coupler, so that the inflow of the concrete port into the coupler can be prevented.

[0015]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a perspective view of a main part showing an embodiment of a reinforcing steel support structure for a formwork of the present invention, FIG. 2 is a plan view of a support member for a bottom formwork that is a main part, and FIG. FIG. 4 is a front view, and FIG. 4 is a bottom view of a part of the same. Similar to the conventional example described with reference to FIG. 2 as a bottom form 1 and a beam bottom form 1a
An example will be described.

In the drawing, reference numeral 6 denotes a support member using, for example, hard plastic as a material for fixing the coupler 2 to the beam bottom form 1a.
mm), the center of the main body 6a is formed in a circular widened portion 7, and a cylindrical insertion projection 8 is integrally provided therewith.

The insertion protrusion 8 has an outer diameter equal to the inner diameter of the coupler 2 and a taper whose upper part is slightly tapered, and a screw hole 9 for fixing to the beam bottom form 1a is provided at the center. .

A notch 10 is formed so that the main body 6a can be cut off at appropriate intervals (in the illustrated example, at 50 mm intervals) in the longitudinal direction of the main body 6a around the position of the insertion protrusion 8. A locking projection 11 and a locking recess 12 for continuously connecting the support member 6 in the longitudinal direction are provided at the forming position and both ends. In this case, the main body 6 is
A locking projection 11 is formed in the direction of one end of a, and a locking recess 12 is formed in the direction of the other end. In the drawing, reference numeral 14 denotes a nail hole provided in the locking projection 11 and the locking recess 12.

Further, the peripheral edge of the main body 6a is formed in a tapered portion 13 so that it can be easily removed.

Next, a method of fixing a reinforcing bar to be driven into this beam by the present invention when constructing, for example, a beam as a preceding body will be described. In the case of constructing a concrete structure such as a building by the reverse driving method, as described above with reference to FIG. And cast
A beam formwork 20 is assembled on this.

A screw reinforcing bar 4 is attached to the beam bottom form 1a of the beam form 20.
In order to lock the support member 6, the support member 6 is fixed on the upper surface of the beam bottom form 1a in advance. The fixing method is as follows. Screws are fixed through screw holes 9 provided in the insertion projections 8 and, if necessary, nail holes 14 provided between the insertion projections 8 as shown in FIG.
Is fixed to the beam-bottom formwork 1a with a nail by using. In this case, the fixing position of the support member 6 can be determined only by marking the end of the plurality of threaded reinforcing bars 4 to be arranged and the black ink along the length direction of the support member 6.

The length of the supporting member 6 is adjusted to the pitch of the threaded reinforcing bars 4 so that the length of the main body 6a is adjusted by appropriately cutting at the location of the cut 10 so that the supporting member 6 is engaged in the longitudinal direction. The stop piece 11 and the locking recess 12 are overlapped. In this state, the length between the insertion protrusions 8 is adjusted to match the pitch of the screw reinforcing bar 4.

Next, the insertion projection 8 is inserted into the coupler 2 of the screw reinforcing bar 4 having the coupler 2 fixed to the lower end by the nut 5. Thereby, the screw rebar 4 is locked at a predetermined position of the beam bottom form 1 via the support member 6. Furthermore, after arranging beam main reinforcing bars and other reinforcing bars in the beam formwork 20, concrete is poured into the beam formwork 20. In this case, since the outer diameter of the insertion projection 8 is formed to be equal to the inner diameter of the coupler 2, the coupler 2 and the insertion projection 8 are in close contact with each other, and the mouth of the concrete does not go inside the coupler 2.

After the concrete is solidified, the beam form 20 is removed. At this time, the removal of the beam bottom form 1a is performed downward, and the support member 6 fixed thereto is also released integrally with the beam bottom form 1a. Is formed in the tapered portion 13 so that it can be easily removed.

In this way, the screw reinforcing bar 4 and the coupler 2 are buried in the beam concrete 21. After the beam form 20 is released, the upper end of another screw reinforcing bar 4a is attached to the coupler 2 as shown in FIG. This is screwed and connected to the screw reinforcing bar 4.

The plywood constituting the beam bottom formwork 1a used as described above can be reused or diverted, and the support member 6 is also made of hard plastic, so that it can be reused.

[0027]

As described above, the reinforcing bar supporting structure for the formwork of the present invention can reduce the time required for inking, can be easily operated, does not require a mounting hole for fixing the coupler, and can convert the formwork plywood. It is possible to use materials effectively,
It is also possible to prevent the entrance of the concrete mouth into the coupler, and there is no danger of hindering the screwing of the rebar later.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part showing an embodiment of a reinforcing bar support structure for a formwork of the present invention.

FIG. 2 is a plan view of a support member, which is a main part, showing an embodiment of a reinforcing bar supporting structure for a formwork of the present invention.

FIG. 3 is a partially cutaway front view of a support member, which is a main part, showing an embodiment of a reinforcing bar support structure for a formwork of the present invention.

FIG. 4 is a bottom view of a part of a support member, which is a main part, showing an embodiment of a reinforcing bar supporting structure for a formwork of the present invention.

FIG. 5 is a longitudinal sectional side view showing an embodiment of the present invention on a beam of a reinforcing bar support structure on a formwork before casting concrete.

FIG. 6 is a longitudinal sectional side view of a reinforcing bar supporting structure for a formwork according to an embodiment of the present invention applied to a beam, when reinforcing bars are joined after concrete is cast.

FIG. 7 is a perspective view showing a conventional example of a reinforcing bar support structure for a formwork.

[Explanation of symbols]

 1, 1a ... Beam bottom form 2 ... Coupler 3 ... Mounting hole 4, 4a ... Screw rebar 5 ... Nut 6 ... Support member 6a ... Body 7 ... Widening part 8 ... Insertion protrusion 9 ... Screw hole 10 ... Cut 11 ... Lock Protrusions 12 ... Recessed recesses 13 ... Tapered parts 14 ... Nail holes 15 ... Underground space 16 ... Soil 17 ... Discarded concrete 18 ... Spacers 20 ... Beam forms 21 ... Beams

────────────────────────────────────────────────── ─── Continuing on the front page (72) Satoru Minakami 1-3-8 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. Tokyo Branch (72) Inventor Kiyotoshi Shibuya 2-28 Shinkawa, Chuo-ku, Tokyo No. 10 Sanmon Co., Ltd. (58) Field surveyed (Int. Cl. ⁷ , DB name) E04G 9/10 104 E04G 21/12 105 E04G 17/14

Claims (3)

(57) [Claims] 1. A support member in the form of a plate having a plurality of insertion protrusions protruding at appropriate intervals protruding from a bottom surface of a formwork, and a lower portion of a coupler having a reinforcing bar attached to the insertion protrusions is inserted into the support. Reinforcing bar support to formwork characterized by supporting the reinforcing bar with members. 2. The reinforcing bar support structure for a formwork according to claim 1, wherein the support member is formed in a plate-shaped main body in an elongated strip shape, and provided with cutouts which can be separated at appropriate intervals in the length direction. 3. The reinforcing bar support structure for a formwork according to claim 1, wherein the outer diameter of the insertion projection is formed to be equal to the inner diameter of the coupler.