JP5947105B2 - PCa formwork fixing structure - Google Patents

Description

  The present invention relates to a PCa formwork (precast formwork) fixing structure used when constructing a reinforced concrete or non-reinforced concrete structure.

  PCa formwork (precast formwork) is a remaining formwork, and when placing concrete, no support work from the back (the side where concrete is not placed) is required, and mold removal work is not required. Suitable for labor-saving construction and rapid construction.

And PCa formwork is fixed and used so that it may not move with the pressure at the time of concrete placement, but there are roughly three fixing methods.
From the back side of the formwork (the side where concrete is not placed), use a single pipe or the like to fix the formwork.
Fix from the inner surface of the formwork using a separator or a metal fitting with a hook.
A hole penetrating the mold is provided and the separator is passed. A separator is connected to a single pipe pipe on the back side of the mold and a reinforcing bar or steel material on the inner side of the mold to fix the force acting on one part of the mold while being dispersed.

In addition, as in Patent Document 1 below, it takes a lot of time and time to pass through the entire front hole of the separator through all the through holes of the PCa mold and fix it to the separator with a nut and foam tie (registered trademark). As a matter of course, there is an engagement between a linear guide member attached between the front ends of the separators at each stage and a long slide member attached over the entire length of the PCa formwork.
JP 2000-240076 A

  In this Patent Document 1, CT steel having a T-shaped cross section is used as the linear guide member, the CT steel is placed sideways, the ends of the T-shaped main piece are directed upward and downward, and the legs orthogonal to the piece. A piece is fixed to the front end of each separator on the same stage.

  Moreover, as the slide member, a lip groove steel material having a C-shaped cross section should be used, and the slide members spaced in the vertical direction should be attached to the reinforcing bars arranged in advance inside the PCa mold when molding the PCa mold. Bend the part toward the back of the PCa formwork, and fix the lip groove steel of the slide member to this part by welding or the like horizontally, and then PCa so that the lip groove steel protrudes horizontally from each step on the back The formwork is molded from concrete.

In Patent Document 2 below, a PCa formwork is disposed on the front surface of an existing concrete wall via a separator, and concrete is placed between the PCa formwork and the existing concrete wall surface to integrate them. A connecting metal fitting provided on the inner side surface of the PCa mold frame facing the existing concrete wall while being provided with a metal fitting on the distal end side of the separator whose base end side is fixed to the existing concrete wall The connecting metal fitting is dropped onto the receiving metal fitting when the PCa formwork is arranged, and the PCa formwork is locked so that the position can be adjusted in the front-rear and left-right directions. Are fixed by positioning with a grout agent.
Japanese Patent No. 3148138

  In Patent Document 1 and Patent Document 2, a PC formwork is disposed on the front surface of an existing concrete wall via a separator, and concrete is placed between the PC formwork and the existing concrete wall surface to be integrated. The hardware for fixing the PCa formwork such as a separator is not considered in the design calculation of the structure, and is installed only for fixing the PCa formwork.

  In addition, in reinforced concrete structures, it is necessary to install hardware that fixes PCa formwork, such as a separator, in a state where many necessary reinforcing bars are arranged by design, workability is poor, and concrete is filled. The space reserved for doing so is obstructed.

  In Patent Document 1, a slide member fixed to the back surface of a PCa mold is fitted from one end to a linear guide member fixed horizontally to the front end of the separator, and the lower end of the PCa mold is brought into contact with the floor slab in order. The PCa mold is slid toward the other end of the linear guide member so that the shutters are closed, and a large number of PCa molds are arranged in a row in front of the reinforcing bar assembly. In such fitting and sliding from the end, workability is poor.

  In Patent Document 2, the connecting metal fitting and the metal fitting are bonded with a grout agent, and fixing takes time.

  The object of the present invention is to eliminate the inconvenience of the conventional example, and the fixed metal fitting of the PCa mold can also be used as a transverse rebar, so that the total amount of steel can be reduced, and the separator that avoids the rebar necessary for the design can be avoided. It is an object of the present invention to provide a fixing structure for a PCa formwork that can omit the trouble of arranging the frame and can be fixed easily and quickly.

In order to achieve the above object, according to the present invention, the flange portion is formed into a corrugated shape on the inner surface side of the PCa mold , and the trough portion is intermittently formed as a concave portion with which the mechanical fixing tool is engaged. An angle bracket is provided, and a mechanical fixing device provided at the tip of the shear reinforcing bar is locked to the recess of the angle bracket, the PCa mold is supported, and it is bridged between the convex peaks between the recesses of the angle bracket. The gist is that the rod-shaped member is placed along the angle fitting and the concave portion is closed with the rod-shaped member .

  According to the first aspect of the present invention, since the shear reinforcing bar is used as the separator, the amount of the steel material as the separator can be reduced, and the labor for arranging the separator while avoiding the reinforcing bar necessary for the design can be omitted. Moreover, it can fix reliably by the simple method of hooking the mechanical fixing tool provided in the front-end | tip of a shear reinforcement bar. In particular, in selecting the position, the concave portion is intermittently formed in the angle fitting, and by selecting one of them, the arrangement position of the shear reinforcing bar can be easily determined.

In addition, since the concave portion of the angle fitting is formed by corrugating the flange portion and is a trough portion, the shear reinforcing bar is hooked into the concave portion when the mechanical fixing tool is inserted into the angle fitting. be able to. Further, the stick-shaped member can be easily pressed out from the concave portion of the angle fitting of the shear reinforcing bar having a mechanical fixing tool attached to the tip.

The present invention as set forth in claim 2 is provided with an angle fitting formed intermittently by forming an inner side of the angle fitting with a concave portion engaged with the mechanical fixing tool on the inner surface side of the PCa mold, The gist of the invention is that the PCa mold is supported by locking the mechanical fixing device provided at the tip to the recess of the angle bracket.

According to the second aspect of the present invention, since the concave portion of the angle fitting is formed by dividing the inside thereof, the formation of the concave portion can be easily performed by providing a partition plate inside the angle fitting.

According to a third aspect of the invention, the inside of the angle bracket is interposed wedge, mechanical fixing member provided at the tip of the shear reinforcement rebar be fastened to the angle bracket by the wedge, the invention of claim 4, wherein The gist of the present invention is that the wedge is a plate that is driven inside the angle fitting along the mechanical fixing tool.

According to the third aspect of the present invention, the mechanical fixing device can be firmly fixed to the angle bracket by the wedge effect. According to the fourth aspect of the present invention, the wedge is a plate body, and the mechanical fixing tool and the angle bracket can be easily fastened by driving the wedge along the mechanical fixing tool.

According to the fifth and sixth aspects of the present invention, in the angle bracket, the half of the channel bracket is embedded in the PCa mold, and in the angle bracket, the half of the channel bracket is bolted to the inner surface of the PCa mold. The gist is to stop.

According to the fifth aspect of the present invention, in order to provide the angle bracket in which the concave portion for hooking the mechanical fixing tool is intermittently formed on the inner surface side of the PCa mold, the angle bracket has the half of the channel bracket. Since it is embedded in the PCa formwork, it can be easily embedded when molding the PCa formwork, and can be firmly attached to the PCa formwork.

According to the sixth aspect of the present invention, after the PCa mold is molded, the angle bracket can be attached to the inner surface of the PCa mold by bolting, and subsequent installation is possible.

  As described above, the PCa formwork fixing structure of the present invention can reduce the total amount of steel material by avoiding the reinforcing bars necessary for the design, since the fixing hardware of the PCa formwork is also used as the transverse reinforcing bars. Thus, the labor for arranging the separator can be omitted, and fixing can be performed easily and quickly.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view showing an embodiment of a PCa mold fixing structure and fixing method according to the present invention. In the figure, 1 is a PCa mold (precast mold).

  On the inner surface side of the PCa mold 1 is provided an angle fitting 2 in which a recess 3 for intermittently hooking a mechanical fixing tool 5 provided at the tip of a shear reinforcement bar 4 of a screw thread reinforcement is formed.

  The angle fitting 2 is formed by embedding the half of a channel fitting 8 such as a lip groove steel material having a C-shaped cross section in the PCa mold 1 as shown in FIG. The half body of the channel metal fitting 8 is previously arranged inside the PCa mold 1 and then the PCa mold 1 is molded with concrete so that the angle metal fitting 2 protrudes horizontally from the back surface.

  The shape of the concave portion 3 of the angle metal fitting 2 is not particularly limited as long as the shear reinforcing bar 4 can enter, and the flange portion 11 of the angle metal fitting 2 is formed into a corrugated shape as shown in the figure, and the trough portion is defined as the concave portion 3. In addition to the projections 9 between the recesses 3 being ridges, the recesses 3 may be rectangular, vertically long, or triangular.

  As shown in FIG. 3, the shear reinforcing reinforcing bar 4 provided with the mechanical fixing tool 5 is provided with an oblong plate as a mechanical fixing tool 5 at the end of the reinforcing bar. There are cases in which welding is performed by bonding or flashing (sparking), or a screw-type reinforcing bar is used, an iron plate is screwed into the end, and is fixed with resin or the like.

  In the latter, an oval plate is screwed into the end of the threaded reinforcing bar and fixed with resin, etc., assembled and installed on site. After assembling the main bars on both sides, it can be installed without any gaps between the outermost reinforcing bars and the workability and quality are excellent.

  In the former, an oblong or rectangular plate is welded to the end of a normal reinforcing bar by friction welding (bonding to the reinforcing bar by high-speed rotation of the plate) or flash (spark). Like the latter, it is excellent in local workability and quality.

  In addition, there is a method similar to the fixing plate method, in which the end of a reinforcing bar is heated by high frequency induction and then pressed into a base to be circularly expanded into a plate shape.

  Using such a shear reinforcing bar 4 as a horizontal bar, the mechanical fixing tool 5 is inserted into the angle bracket 2 and is locked in the recess 3. Thus, the PCa mold 1 is fixed by hooking the shear reinforcing bar 4 to the concave portion 3 of the flange portion 11 of the angle fitting 2 so as to lock the mechanical fixing device 5.

  Further, the rod-shaped member 6 such as a reinforcing bar is placed along the angle metal fitting 2 so as to be bridged between the peaks of the convex portions 9 between the concave portions 3 of the angle metal fitting 2, and the concave member 3 is closed with the rod-shaped member 6. Thereby, the protrusion from the recessed part 3 of the shear reinforcement bar 4 can be suppressed.

  The rod-like member 6 may be fixed by welding, but a hole 7 is provided in the convex portion 9 and is bound by a binding wire 10 or a number wire. The rod-like member 6 may also serve as a structural reinforcing bar in the concrete to be placed.

  FIG. 4 shows a second embodiment. The angle fitting 2 has a half of a channel fitting 8 such as a lip groove steel having a C-shaped cross section, and the channel fitting 8 is embedded in the PCa mold 1. Instead, the bolts are fixed to the inner surface of the PCa mold 1 with anchor bolts 12 or the like.

  If it does in this way, angle metal fitting 2 can be attached to PCa formwork 1 after fabrication after the fact.

  5 and 6 show a third embodiment of the present invention, in which the recess 13 for hooking the mechanical fixing tool 5 provided at the tip of the shear reinforcing bar 4 of the angle bracket 2 is formed on the inner side of the angle bracket 2. 2a was obtained by partitioning.

  The direction of the partition is not limited, but the partition plate 14 is welded to the inner side 2a of the angle metal fitting 2 to form a recess 13 between the partition plates 14.

  Although illustration is omitted, if the partition plates 14 are arranged at equal intervals and the recesses 13 are formed intermittently at predetermined intervals, it is possible to easily select the shear reinforcement reinforcing bar by selecting one of them. An arrangement position can be determined.

  FIGS. 7 and 8 show the fourth and fifth embodiments. A wedge is interposed inside the angle fitting 2, and the mechanical fixing device 5 provided at the tip of the shear reinforcing bar 4 is attached to the angle fitting 2 by the wedge. The mechanical fixing device 5 can be firmly fixed as compared with the case of the third embodiment.

  In the fourth embodiment of the present invention, as shown in FIG. 7, when the recesses 13 are formed between the partition plates 14, the side inner surfaces of the recesses 13 are tapered surfaces 18 a and the wedge insertion recesses 18 in the vertical direction. To form.

  In accordance with this, the left and right ends of the mechanical fixing device 5 are formed in a wedge shape 5a so as to be inserted into the wedge insertion recess 18 in the vertical direction.

  With the left and right ends being wedge-shaped 5 a, the mechanical fixing device 5 enters the concave portion 18 for wedge insertion in the vertical direction, so that the mechanical fixing device 5 can be firmly locked on the inner side 2 a of the angle bracket 2.

  In the fifth embodiment of the present invention, as shown in FIG. 8, it is assumed that the wedge is a wedge plate body 19 that is driven along with the mechanical fixing tool 5 inside the angle fitting 2. The width of the wedge plate body 19 may be approximately the same as that of the mechanical fixing device 5, or may be a horizontally long strip that follows the flange portion 11 of the angle bracket 2.

  The mechanical fixing device 5 can be firmly fastened in the angle fitting 2 by inserting the mechanical fixing tool 5 into the angle fitting 2 and then driving the wedge plate body 19 from above.

It is a perspective view which shows 1st Embodiment of the fixation structure of the PCa formwork of this invention. It is a side view which shows 1st Embodiment of the fixation structure of the PCa formwork of this invention. It is a perspective view of the shear reinforcement steel bar which provided the mechanical fixing tool. It is a side view which shows 2nd Embodiment of the fixation structure of the PCa formwork of this invention. It is a perspective view which shows 3rd Embodiment of the fixation structure of the PCa formwork of this invention. It is a side view which shows 3rd Embodiment of the fixation structure of the PCa formwork of this invention. It is a perspective view which shows 4th Embodiment of the fixation structure of PCa formwork of this invention. It is a side view which shows 5th Embodiment of the fixation structure of PCa formwork of this invention.

DESCRIPTION OF SYMBOLS 1 ... PCa formwork 2 ... Angle metal fitting 2a ... Inside 3 ... Concave 4 ... Shear reinforcement bar 5 ... Mechanical fixing tool 5a ... Wedge shape 6 ... Bar-shaped member 7 ... Hole 8 ... Channel metal fitting 9 ... Convex part 10 ... Bundling wire 11 ... Flange portion 12 ... anchor bolt 13 ... recess 14 ... partition plate 16 ... wedge insertion recess 17 ... through hole 18 ... wedge insertion recess 18a ... taper surface 19 ... wedge plate body

Claims (6)

A machine in which an angle fitting is formed on the inner surface side of a PCa mold by forming a flange portion into a corrugated shape and intermittently forming a trough portion as a recess to be engaged with a mechanical fixing tool, and provided at the tip of a shear reinforcing bar Lock the type fixing tool in the recess of the angle bracket, support the PCa formwork , and place the rod-shaped member along the angle bracket so as to bridge the convex peaks between the recesses of the angle bracket. A fixing structure of a PCa formwork, characterized in that a recess is closed . Provided on the inner surface side of the PCa formwork is a mechanical fixing tool provided at the tip of a shear reinforcing bar by providing a concave part that engages with the mechanical fixing tool by intermittently forming an inner side of the angle fitting to form a recess. A PCa mold frame fixing structure, wherein the PCa mold frame is supported by being locked in a recess of an angle metal fitting.   3. The PCa frame fixing structure according to claim 1, wherein a wedge is interposed inside the angle fitting, and a mechanical fixing device provided at the tip of the shear reinforcing bar is fastened in the angle fitting by the wedge.   4. The PCa formwork fixing structure according to claim 3, wherein the wedge is a plate that is driven inside the angle fitting along the mechanical fixing tool.   The angle bracket is a PCa mold fixing structure according to any one of claims 1 to 4, wherein the half of the channel bracket is embedded in the PCa mold.   6. The PCa mold fixing structure according to claim 1, wherein the angle bracket is formed by bolting a half of the channel bracket to the inner surface of the PCa mold.

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