JP4057204B2 - Formwork fixing structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a column or beam form fixing structure for a truss embedded PC plate in a steel reinforced concrete structure (SRC structure).
[0002]
[Prior art]
A truss-embedded PC board in which a portion of truss bars provided in advance in a factory or the like is exposed and embedded in a PC board is used as a building wall material. When a concrete wall is formed using such a truss-embedded PC plate (hereinafter simply referred to as a PC plate), this PC plate is used as an outer formwork on the site and facing the inner surface side (truss exposed surface side) Then, concrete is placed by fixing and holding the inner formwork made of plywood or the like. As a result, the PC board is integrated with the cast-in-place concrete to form the outer wall.
[0003]
When forming a mold on the inner surface side of such a PC board, a separator is used to fix and hold the mold in a position facing the PC board at a predetermined wall thickness. When forming the formwork, the PC plate is supported by the slab on the lower floor and held vertically by the support, and the end of the separator is placed at a predetermined position with the reinforcing bars of the wall material arranged. Secure to the inner surface. After that, a mold with a hole in advance corresponding to the position of the separator is placed facing the PC board, the separator is inserted through the hole, and a fastener is attached to the bolt of the protruding portion to fix the mold. To do.
[0004]
Conventionally, in order to connect the separator and the PC plate, an insert nut is embedded in the PC plate side in advance, and a bolt at the end of the separator is screwed to the insert nut and fixed.
[0005]
[Problems to be solved by the invention]
However, in the conventional method in which the bolt at the end of the separator is screwed into the insert nut, especially when the reinforcing bars are densely arranged in the column or beam, and the hand cannot reach the insert nut, It is very difficult to screw the insert nut into the insert nut from a distant position, while the workability is poor, and the workability is poor, and the periphery becomes dimmed especially in the part where the rebar is dense on the back of the PC board. This makes it difficult to visually confirm the position of the nut, further reducing the workability of the separator mounting work.
[0006]
On the other hand, without using such an insert nut, a U-shaped retainer is screwed onto the end of the separator, and the retainer is hooked on the truss bar of the PC board, and then the separator is turned to hold the bolt. A method has been proposed in which the separator is fixed to the truss bar by protruding into the tool (Japanese Utility Model Laid-Open No. 60-57649).
[0007]
By using such a separator having a U-shaped holding tool, the separator can be easily coupled to the truss bar of the PC plate, and workability is improved. Thereby, the workability | operativity of formwork formation in RC structure (reinforced concrete structure) using a PC board is aimed at.
[0008]
However, when such a separator having a U-shaped holding tool is used for an SRC structure building, when a column or beam form is formed opposite to a PC plate, The separator was attached avoiding the steel frame of the beam. For this reason, for example, when forming a column formwork, a separator is attached to the left and right of the steel frame in the center of the pillar and the formwork is fixed and held on the steel frame. In other words, the number of attachments increases and the work becomes complicated, and the balance in the strength of the separator arrangement in the left-right direction is not uniform, reducing the reliability of holding the formwork.
[0009]
Also, depending on the embedding direction and arrangement form of the truss bars on the PC board, the truss bars may not be arranged at the position when trying to narrow the separator mounting interval. Attach the separator at the optimal position. There was a possibility that it would not be possible to cause a problem in strength.
[0010]
The present invention takes the above-mentioned prior art into consideration, and when a PC plate in which truss bars are embedded in an SRC structure building is used, the separator of the formwork can be easily attached to the PC plate without causing a problem in strength. It is an object of the present invention to provide a formwork fixing structure that is securely joined and improved in workability for forming a formwork.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a formwork fixing structure for fixing a column or beam formwork facing the truss-embedded PC board in the SRC structure, wherein the formwork is the truss-embedded PC board. A mold fixture that is fixedly held at a predetermined distance from the mold, and the mold fixture is screwed into the latch member and a latch member that latches the truss bar of the PC plate with embedded truss muscle. A separator member for fixing the locking member to the truss bar and holding the mold frame at a predetermined interval from the truss-embedded PC plate, and a fastening member for fixing the separator member to the mold frame The separator member is disposed between the truss bar and the mold frame through a steel frame constituting the column or beam. Provide a fixed structure.
[0012]
According to this configuration, the steel frame can be formed with a small-diameter hole that does not hinder the strength, and through the hole, the locking member at the tip of the separator can be inserted and hooked to the truss bar. The separator member can be disposed at the position to attach the mold fixing tool, and the structural strength of the mold can be ensured. Further, since the locking member screwed to the separator member can be easily hooked and locked to the truss bar, the separator member can be rotated and locked to the truss bar after locking. As a result, the mold fixing tool can be easily and securely coupled to the PC board even in a narrow place where it is difficult to reach or in a dim place where the position cannot be confirmed with the eyes. improves.
[0013]
Further, the locking member of the formwork fixture has a nut into which the threaded portion of the end of the separator member is screwed, and has a detent nut for preventing rotation of the locking member with respect to the separator member. It is characterized by.
[0014]
According to this configuration, since the locking member is prevented from rotating with respect to the separator member before the locking member is locked to the truss bar, for example, the locking member is hooked from the side against the vertical truss bar. When locking, the locking member can be prevented from rotating by its own weight, and the locking operation is smoothly performed.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a partial cross-sectional configuration explanatory view of a mold fixing structure according to an embodiment of the present invention, and FIG. 2 is a partial cross-sectional configuration explanatory view seen from the AA direction. Moreover, FIG. 3 is a single item view of the locking member constituting the formwork fixture.
[0016]
The PC board (truss embedded PC board) 1 is arranged with the exposed surface of the embedded truss 2 facing the inside of the building. The truss 2 includes a pair of corrugated or zigzag reinforcing bars 2a and 2a arranged to face each other in the vertical direction in FIG. 1, and a reinforcing bar 2b joined to the exposed tops of the reinforcing bars 2a and 2a. It is comprised by the reinforcing bar 2c joined to the embedding part of the reinforcing bars 2a and 2a.
[0017]
A steel frame 5 constituting a column or a beam is provided on the inner surface side of the PC plate 1, and a main reinforcement 3 and a hoop reinforcement 4 are provided around the steel frame 5. In the case of a pillar or the like, for example, a steel frame that crosses in a cross shape in a cross section is disposed, and a main muscle 3 is provided around the cross, and a hoop muscle 4 is wound around the main muscle 3. In some cases, it is simplified in the figure. In addition, in the drawing, the thickness of the PC board 1 and the thicknesses of the reinforcing bars 2a, 2b, 2c are drawn with the PC board 1 large in order to clarify the configuration. In the actual example, the diameter of the truss bar is often smaller than the diameter of the main bar 3.
[0018]
The steel frame 5 is formed with a small-diameter hole 6 (exaggeratedly large in the drawing) that does not affect the design strength of the steel frame 5. A mold fixture 7 is attached through the hole 6 of the steel frame 5. The mold fixing tool 7 is attached to a locking member 8 that engages with the reinforcing bar 2 b of the truss 2, a separator 9 that is screwed into the locking member 8, and an inner end of the separator 9. It is comprised with the fastener 10 made.
[0019]
As shown in FIG. 3, the locking member 8 is made of a U-shaped iron plate or a casting bent to a size that can pass through the hole 6 of the steel frame 5, and reinforcing bars are inserted into both U-shaped pieces. A notch hole 11 for locking is formed. A hook-like protrusion 11 a is formed at the opening of the notch hole 11. A nut member 12 is fixed to the locking member 8 by welding. A screw 14 formed at the tip of the separator 9 is screwed into the nut member 12. In addition, when the U-shaped locking member 8 is manufactured by casting, it may be integrated including the nut member.
[0020]
A detent nut 13 is provided on the upper surface of the nut member 12. The screw 14 of the separator 9 is screwed into the internal thread of the jam nut 13. A notch hole for fitting the notch hole 11 of the locking member 8 into the reinforcing bar 2b in the vertical direction (vertical direction) by screwing the separator 9 into the nut member 12 via the locking nut 13 as described above. When the latching member 8 is held by the separator 9 with the opening of 11 lying sideways, the latching member 8 is prevented from rotating by its own weight, and the work of attaching the latching member 8 to the reinforcing bar 2b is smooth. Done.
[0021]
In the middle of the separator 9, a wrench recess 15 is formed. The fixing plate 16 is screwed into the screw 17 at the inner end of the separator 9. The end of the separator 9 protrudes inside the mold (inside the building) through a hole 18a formed in the mold 18 made of plywood. The fastener 10 is screwed onto the screw 17 of the separator 9 protruding inside the mold 18, the mold 18 is sandwiched between the fixing plate 16 and the fastener 10, and is fastened and fixed by the fastener 10.
[0022]
On the rear surface (inside the building) of the mold 18, an end thick material (not shown) for supporting the mold is fixed to the fastener 10. This end thick material is made of square or round pipe, and in the case of a column formwork, the vertical end thick material is attached in contact with the rear surface of the formwork 18, and the horizontal end thick material is usually on the rear surface side. Two sets are provided at appropriate intervals in the vertical direction. In this case, the fastener 10 is formed in a T-shape, and is locked to the two large thick ends, and the T-shaped fastener and the separator 9 are fastened to fix the separator 9 via the thick end material. It is good also as a structure which clamps and holds the formwork 18 between the board 16 and a fastener.
[0023]
When assembling the formwork 18, first, the PC plate 1 is placed on the upper surface of the floor concrete under construction with the exposed surface of the truss facing inward, and held and fixed vertically by a support. In this state, the mold fixing tool 7 is inserted through the hole 6 of the steel frame 5, the locking member 8 at the tip thereof is hooked on the reinforcing bar 2 b of the truss 2 of the PC plate 1, and the reinforcing bar 2 b is fitted into the notch hole 11. . At this time, as described above, the locking member 8 is held at the tip of the separator 9 without rotating by its own weight by the action of the rotation stopper 13.
[0024]
Subsequently, the separator 9 is turned so that the screw 14 at the tip thereof protrudes from the nut 12 into the notch hole 11, and the reinforcing bar 2 b is fixed in the notch hole 11. During the rotation operation of the separator 9, the reinforcing bar 2 b is accommodated in the hook-shaped protrusion 11 a in the opening of the notch hole 11, so that the locking member 8 is prevented from rotating. Incidentally, the locking nut 13 is tightened to such an extent that the locking member 8 does not rotate under its own weight, and does not hinder the rotation operation of the separator 9.
[0025]
Next, the mold 18 is erected along the steel frame 5 of the pillar, and the screw 17 at the end of the separator 9 is projected from the hole 18a to the rear surface (inside the building) of the mold 18. Next, the fastener 10 is attached to the screw 17 of the separator 9 protruding to the rear surface side of the mold 18 to fix the mold 18, and the thick end material is further fixed. As a result, the mold 18 is assembled and fixed and held in a state of facing the PC board. Concrete is placed in this formwork. After the concrete is hardened, the fastener 10 is removed, and the mold 18 is removed.
[0026]
FIG. 4 is a perspective view of the embodiment of the present invention.
As shown in the drawing, the locking member 8 at the tip of the separator 9 is inserted into the hole 6 of the steel frame 5 with the notch hole 11 lying sideways and hooked on the reinforcing bar 2 b of the truss 2. Although the truss 2 is formed in a plurality of rows on the inner surface of the PC plate 1, only one row is shown in the figure.
[0027]
FIG. 5 is a diagram illustrating the configuration of another embodiment of the present invention.
In this embodiment, a separator is constituted by two rods 9 a and 9 b connected by a coupler 19. The coupler 19 can be used to adjust the length of the separator to adjust the entrance / exit of the mold 18. Reference numeral 20 denotes a detent which fixes the rods 9a and 9b at the position adjusted by the coupler 19. A connector 21 is screwed onto the screw 17 at the end of the separator, and a screw member (not shown) is attached to the end of the connector 21, and this screw member protrudes to the rear surface side of the mold 18. The connector 10a is attached to the protruding screw member, and a fastener (not shown) is attached to the screw 22 at the end.
[0028]
According to the embodiment shown in FIG. 5, the length of the separator composed of the rods 9a and 9b can be adjusted before the mold 18 is assembled, and the entrance and exit can be adjusted after the mold is assembled. The assembling procedure of the mold is the same as that in the above-described embodiment.
[0029]
FIG. 6 is a horizontal sectional view of a wall and a column portion of a mold fixing structure according to another embodiment of the present invention, and FIGS. 7 and 8 are a front view and a column portion after the mold is removed, respectively. It is sectional drawing.
This embodiment shows a configuration in the case of performing concrete casting of the pillar 24 and the beam 25 integrally with the wall 23. A PC plate 1 a is disposed corresponding to the wall 23, and a PC plate 1 b is disposed corresponding to the pillar 24. The column 24 includes a steel frame 26, a main reinforcement 27 around it, and a hoop reinforcement 28 around which it is wound. Steel frames 29 constituting the beam 25 are joined to both sides of the upper portion of the steel frame 26 of the column 24 by welding.
[0030]
A mold 30 that forms the wall 23 is disposed opposite to the PC plate 1a. A mold 31 for forming the pillars 24 is disposed so as to face the PC plate 1b, and molds 32 on the sides of the pillars are disposed on both sides thereof. A vertical end thick member 33 and a horizontal end thick member 34 made of a round pipe are provided outside the molds 31 and 32 of the column 24.
[0031]
The mold 31 facing the column PC plate 1b is fixed and held by a mold fixture 36 that is inserted through a hole 35 formed in the web 26a of the steel frame 26, as in the above-described embodiment. As in the example of FIGS. 1 and 2 described above, the mold fixture 36 includes a locking member 8 coupled to the reinforcing bar 2b of the truss 2 of the PC plate 1b and a separator 9 inserted through the hole 35 of the steel frame 26. And a fastener 37 that fixes the mold 31 to the separator 9. In this example, the fastener 37 is locked to the thick end material 34, and the mold 31 is pressed toward the fixing plate (not shown) (see the fixing plate 16 in FIG. 1) attached to the separator 9. It is the structure which is tightened and fixed by.
[0032]
The column side mold 32 includes a separator 39 having a locking member 38 at the tip thereof, which is locked to the flange 26b of the steel frame 26, and a fastener 37 that is screwed into the separator to fix and hold the mold 32 together with the thick end material. It is assembled by.
[0033]
As shown in FIG. 6, the mold 30 that forms the wall 23 includes a separator 41 having a locking member 40 that locks the reinforcing bar 2 b of the truss 2 at the tip, and a thick end of the wall surface that is screwed into the separator 41. (Not shown) and a fastener (not shown) for fixing and holding the mold 30 together.
[0034]
The steel frame 29 constituting the beam 25 is formed with a hole 42 (FIG. 7) through which a formwork fixture (not shown) for fixing and holding the formwork is inserted in the same manner as the pillar.
[0035]
FIG. 9 shows an example of the structure in which the intermediate part of the separator is supported on the steel frame of the column.
As described above, the hole 43 through which the separator of the mold fixing tool is inserted is formed in the web 43a of the steel frame 43. A clamp fitting 45 is fixed to the flange 43 b of the steel frame 43 by a bolt 55. The separator 9 is sandwiched between the clamping plates 46 by the sandwiching plates 46 and fastened by nuts 47 from both sides to fix the clamp fittings 45 and the separators 9 to each other. By clamping the separator 9 outside the steel frame 43 to the steel flange 43b in this way, the separator 9 is stably fixed and held in the direction perpendicular to the PC plate surface.
[0036]
FIG. 10 is a horizontal sectional view of another structural example in which the intermediate part of the separator is supported on the steel frame of the column. FIGS. 11 and 12 are a detailed view of the structure of FIG. It is the detailed view seen from -Y direction.
[0037]
The web 48a of the steel frame 48 is formed with a hole 50 through which a separator 9 of a mold fixture similar to the mold fixture 7 of the embodiment of FIGS. 1 and 2 is inserted. Support metal fittings 51 made of a C-type steel material are welded to the outside of the flanges 48 b on both sides of the steel frame 48. A notch 52 is formed in the back plate 51 a of the support metal 51. The separator 9 is inserted into the notch 52. The separator 9 is coupled to the reinforcing bar 2b of the truss 2 by a locking member 40 at the tip. The separator 9 and the support fitting 51 are fixed to each other by sandwiching the back plate 51a of the support fitting 51 with the holding plate 53 attached to the separator 9 and fastening with the nuts 54 from both sides thereof. In this manner, by fixing and supporting the separator 9 outside the steel frame 48 to the steel flange 48b, the separator 9 is stably held in the direction perpendicular to the PC plate surface.
[0038]
【The invention's effect】
As described above, in the present invention, a small-diameter hole is formed in the steel frame so that there is no problem in strength, and the locking member at the tip of the separator can be inserted through this hole and hooked to the truss bar. A separator member can be arranged at an optimal position on the balance to attach the mold fixing tool, and the structural strength of the mold can be ensured. Moreover, it is possible to prevent the rotation due to the weight of the locking member screwed to the separator member with the jam nut, easily hooked to the truss muscle Ki de be locked by turning the separator member after engaging the truss The separator member can be accurately fixed to the streak. As a result, the mold fixing tool can be easily and securely coupled to the PC board even in a narrow place where it is difficult to reach or in a dim place where the position cannot be confirmed with the eyes. improves.
[Brief description of the drawings]
FIG. 1 is a configuration explanatory diagram of a formwork fixing structure according to an embodiment of the present invention.
FIG. 2 is a diagram illustrating the structure of FIG. 1 as viewed from the side.
3 is a detailed explanatory view of a locking member having the structure of FIG. 1. FIG.
4 is a perspective view of the structure of FIG.
FIG. 5 is a diagram illustrating the configuration of another embodiment of the present invention.
FIG. 6 is a horizontal sectional view of still another embodiment of the present invention.
7 is a front view of the embodiment of FIG.
8 is a cross-sectional view of a column portion of the embodiment of FIG.
FIG. 9 is a configuration explanatory diagram of still another embodiment of the present invention.
FIG. 10 is a horizontal sectional view of still another embodiment of the present invention.
11 is an arrow view in the XX direction of FIG.
12 is an arrow view in the YY direction of FIG.
[Explanation of symbols]
1: truss embedded PC board, 2: truss, 2a, 2b, 2c: steel bar, 3: main bar, 4: hoop bar, 5: steel frame, 6: hole, 7: mold fixing tool, 8: locking member, 9: Separator, 10: Fastener, 11: Notch hole, 11a: Protrusion, 12: Nut, 13: Non-rotating nut , 14: Screw, 15: Recess, 16: Fixing plate, 17: Screw, 18: Formwork 18a: hole, 19: coupler, 20: detent, 21: connector, 22: screw, 23: wall, 24: pillar, 25: beam, 26: steel frame, 26a: web, 26b: flange, 27: main bar 28: Hoop muscle, 29: Steel frame, 30, 31, 32: Formwork, 33: Vertical end thick material, 34: Horizontal end thick material, 35: Hole, 36: Formwork fixing tool, 37: Fastener, 38 : Locking member, 39: Separator, 40: Locking member, 41: Separator, 42: Hole, 43: Steel frame, 43 : Web, 43 b: flange, 44: hole, 45: clamp bracket, 45a: back plate, 46: holding plate 47: nut, 48: steel, 48a: Web, 48b: flange, 5 0: hole, 51: support Metal fitting, 51a: back plate, 52: notch, 53: clamping plate, 54: nut, 55: bolt

Claims (1)

A mold fixing structure for fixing a column or beam form to face a truss embedded PC board in an SRC structure, and the mold is fixed and held at a predetermined distance from the truss embedded PC board. using a fastener, the mold frame fixture, fixing a locking member for locking the truss muscle of the truss embedded PC plate, the locking member with respect to the truss muscle screwed to the locking member And a separator member for holding the mold frame at a predetermined distance from the truss embedded PC plate, and a fastening member for fixing the separator member to the mold frame. And the locking member is disposed between the truss bar and the formwork , and the locking member has a nut into which a threaded portion of the end of the separator member is screwed. Prevent member rotation Mold fixing structure for posts or beams for truss embedded PC board, characterized in that it comprises a jam nut for.

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