JP2010248733A - Device for fixing void form base - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for fixing a void form base which can fix the void form base to a slab form only from the upside of the slab form, and can reduce workers, shorten a construction period, and improve the safety of work. <P>SOLUTION: The device for fixing the void form base includes: a nut member 19 which can pass through a through-hole 17 of the slab form 16; a spring member 20 which is fixed to the side of one surface of the nut member 19; a hook member 21 locked to the void form base 11; and a screw member 22 screwed into the screw hole 23 of the nut member 19 from a screw insertion hole 32 of the hook member 21. The nut member 19 which is inserted through the through-hole 17 of the slab form 16 from above, and held at the backside of the slab form 16 by the spring member 20; and the screw member 22 screwed into the screw hole 23 of the nut member 19 from the screw insertion hole 32 of the hook member 21 which is locked to the void form base 11, thus fixing the void form base 11 to the slab form 16. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention, when constructing a void slab, in order to support a void mold frame made of steel pipe or the like, a void mold frame for fixing a void mold frame mount placed on the upper surface of the slab mold frame to the slab mold frame The present invention relates to a frame mount fixing device.

  Conventionally, a general method for constructing a void slab in which a void mold made of a steel pipe or the like is horizontally embedded in a concrete slab is as shown in FIG. The void type frame base 2 is installed on the upper surface of the slab mold frame 4 in which the through holes 3 are previously provided, and the shaft 1 provided on the void type frame base 2 is connected to the upper surface of the slab mold frame 4 in the through holes 3. The void form frame base 2 is slab type by inserting from the side and projecting to the lower surface side, and tightening the nut 5 screwed to the shaft 1 on the lower surface side of the slab mold frame 4 or driving a wedge-shaped metal fitting into the shaft. The void form 6 is placed and fixed on the void form frame base 4 in this state, and the void form frame 6 is formed by placing concrete 7 so that the void form frame 6 is not lifted by buoyancy. To do It is.

  In addition, as another method for constructing a void slab, a U-shaped section material having a downward cross-section is used for the void mold, and this is disposed on the slab mold (see, for example, Patent Document 1) or disposed on the slab mold. There has been proposed a method of placing concrete in a state where water is poured into the inside of the lightweight void pipe to prevent the concrete from being lifted (see, for example, Patent Document 2).

Japanese Patent Publication No. 6-27370 JP 9-310440 A

  By the way, the conventional structure for fixing the void type frame base as described above requires the work on the upper side and the lower side of the slab form frame to fix the void type frame base. And there is an inconvenience that you have to place work personnel on the lower side.

  Also, when fixing the void formwork base, tightening the nut screwed to the shaft on the lower surface side of the slab formwork or driving the wedge-shaped metal fitting into the shaft is work at a high place, climbing up the stepladder This work is not only laborious but also dangerous.

  In addition, when the lower worker inadvertently contacts the shaft, the position of the void form frame base is shifted despite the positioning of the void form base in accordance with the construction drawings in advance. It has to be rearranged, and wasteful work time is required.

  Further, when adjusting the position of the void formwork frame, the lower worker must communicate with the upper worker with a loud voice, and there is a problem that adjustment work is difficult when the voice is difficult to hear.

  Moreover, the construction method of the void slab shown in Patent Document 1 requires the embedding of reinforcing bars for fixing the void formwork, and the concrete construction must be performed in two steps, which requires a long construction period. Become.

  The method for constructing a void slab shown in Patent Document 2 requires the operation of injecting and extracting water into the void formwork, and it is actually troublesome to perform such an operation for constructing the slab. It is poor.

  Therefore, the object of the present invention is to allow the void formwork frame to be fixed to the slab formwork only from the upper side of the slab formwork, eliminating the need for troublesome contact between the top and bottom of the slab formwork, and reducing the number of personnel. It is an object of the present invention to provide a void formwork frame fixing device capable of shortening the construction period, reducing labor costs, and improving work safety.

  In order to solve the above-described problems, the present invention provides a void type frame base that fixes a void type frame base installed on the upper surface of a slab form frame to a slab type frame using a through hole provided in the slab type frame. A width and thickness capable of passing through the through-hole of the slab form, and a length longer than the diameter of the through-hole, so as to penetrate the thickness in the middle portion in the length direction. A nut member provided with a screw hole, and a small-diameter side end portion within the through-hole to have a larger diameter than the screw hole, and a large-diameter side end portion having a larger diameter than the through-hole. A spring member that is formed in a taper shape that can pass through a through hole and that has a small diameter side end fixed to one side of the nut member in a coaxial arrangement with the screw hole, and an upper portion that engages with a void type frame base. A hook part with a screw hole and a screw insertion hole at the bottom. And a screw member that is screwed into the screw hole of the nut member from the screw insertion hole of the hook member. The screw member has a screw shaft having a head at one end inserted into the screw insertion hole of the hook member. And a length that protrudes toward the back side of the slab formwork, and a threaded portion is provided in the middle of the screw shaft, and an engaging portion of the rotary tool is provided at the tip.

  The nut member has a semi-circular cross section in the thickness direction so that the contact surface with the back surface of the slab form is flat, and the contact surface has a protrusion for preventing rotation and a spring member coupling portion surrounding the screw hole. It can be provided, or the spring member can be formed of a coil spring in which a metal wire is wound counterclockwise.

  Further, the screw member has a polygonal head portion, and a threaded portion provided in the middle of the screw shaft is inserted into the screw insertion hole of the hook member and is equal to or above the upper surface of the slab formwork. It can be set as the structure set so that it may be located.

  Here, the above-mentioned void type frame mount has a structure in which a bifurcated support leg using the same metal wire is welded to each position on both sides of the lower part of the receiving member obtained by processing the metal wire into, for example, a semicircular arc shape. The void mold placed on the slab mold is arranged at a predetermined height on the slab mold, and is fixed so as to be pressed from above with a wire fixed to the receiving member at both ends.

  The hook member is formed by providing a hook portion that bends to one side at the upper end of a vertical plate using a strip-shaped metal plate and a bent piece that bends to the other side at the lower end, and the hook portion is formed as the void type. The bent piece has a vertical dimension so that it is positioned above the upper surface of the slab mold frame in a suspended state that is locked at the lower center position of the receiving member in the frame base, and a screw insertion hole is provided in the bent piece. It has been.

  Further, the nut member has a semicircular cross-sectional rod shape that is about half of the through-hole of the slab form frame, and both ends have a hemispherical shape, and a plurality of ribs along the length direction are formed on the arc-shaped outer surface. At the same time as improving the strength, when inserted into the through hole of the slab formwork, the contact area with the inner peripheral surface of the through hole is reduced, and the passage through the through hole can be obtained smoothly.

  According to the present invention, it becomes possible to fix the void formwork frame on the slab formwork only by the work from the upper surface side of the formwork, and it is not necessary to make troublesome contact between the upper and lower sides of the slab formwork. Since the worker can perform the fixing work, it is possible to reduce the number of workers required to construct the void slab, shorten the construction period, reduce the labor cost, and improve the safety of the work.

  In addition, when the void formwork frame is fixed, it is not necessary to work on the lower part of the slab formwork and work is done only from the upper side, which not only improves safety but also improves work efficiency and shortens delivery time. become.

  Further, since the shaft portion of the screw member can be folded at the upper surface of the slab formwork, the processing work on the lower surface of the slab after disassembling the slab formwork becomes easy, and the nut member has a protrusion, so that the slab The slab formwork can be reused for a long time without damaging the formwork more than necessary.

(A) is an exploded perspective view showing a fixing device according to the present invention, (b) is an enlarged vertical side view showing the assembled state of the fixing device. Perspective view showing the void formwork mount Longitudinal front view showing a state where the void formwork frame is fixed to the void formwork using a fixing device Longitudinal side view along arrow AA in FIG. (A) is the expanded longitudinal cross-sectional view which shows the 1st example of the spring member coupling | bond part which couple | bonds the nut member and spring member in a fixing device, (b) is the expanded longitudinal section which shows the 2nd example of a spring member coupling | bond part. FIG. 4C is an enlarged longitudinal sectional view showing a third example of the spring member coupling portion. (A) is a longitudinal cross-sectional view of a state in which a nut member and a spring member are inserted into a through hole of a slab mold, and (b) is a screw insertion hole of a hook member that is locked to a void type frame mount on the slab mold. The longitudinal cross-sectional view which shows the state which penetrates a screw member and screws this into the screw hole of a nut member, (c) is a longitudinal cross-sectional view which shows the state which screwed the screw member and fixed the void type frame stand (A) is a longitudinal sectional view showing a state where the void formwork is fixed to the void formwork mount, and (b) is a longitudinal sectional view showing a state where the concrete is placed on the slab formwork. (A) is a longitudinal cross-sectional view which shows the state which couple | bonded the rotary tool with the front-end | tip of a screw member, (b) is a longitudinal cross-sectional view which shows the state which cut off the screw shaft of the screw member Longitudinal sectional view showing a state where the screw shaft and nut member of the cut screw member are removed from the slab formwork A longitudinal front view showing a state in which a void formwork frame is fixed to a slab formwork using a conventional fixing device.

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

  FIG. 2 shows a void type frame base 11 in which a void type frame such as a steel pipe for constructing a void slab is arranged on the upper surface of the slab type frame. A void mold 14 placed on a receiving member 12 is arranged at a predetermined height on a slab mold, and has both ends receiving members. It is fixed so as to be pressed down from above with a wire 15 or the like fixed to the wire.

  As shown in FIGS. 3 and 4, in order to fix the void form frame base 11 on the slab form frame 16, the slab form frame 16 has a predetermined diameter in advance at a position where the void form frame base 11 is disposed. A hole 17 is provided.

  The most preferable relationship between the nut member 19 and the through-hole 17 is that the minimum gap between the nut member 19 and the through-hole 17 is 0.4 mm. This is because the rigidity of the nut member 19 and the strength for fixing the void-type frame base 11 are drawn out to the maximum, and after the concrete is placed, the through-holes 17 are closed over a wider area, thereby allowing the concrete to flow out. This is because the effect of preventing the phenomenon is improved.

  As shown in FIG. 1, a fixing device 18 that fixes the void formwork base 11 on the slab formwork 16 includes a nut member 19 inserted into the through hole 17 of the concrete formwork 16, and one surface of the nut member 19. The spring member 20 is fixed to the side, the hook member 21 is engaged with the void-type frame base 11, and the screw member 22 is coupled to the hook member 21 and the nut member 19.

  The nut member 19 has a width and thickness through which the through-hole 17 of the slab mold 16 can pass and a length longer than the diameter of the through-hole 17, and penetrates the thickness in the middle portion in the length direction. Thus, a screw hole 23 is provided.

  The nut member 19 has a semicircular cross-sectional rod shape that is about half the diameter with respect to the through-hole 17 of the slab mold 16 and has a hemispherical shape at both ends. A plurality of ribs along the length direction are formed on the arcuate outer surface. 24 is formed to improve the strength, and at the same time, when inserted into the through hole 17 of the slab mold 16, the contact area with the inner peripheral surface of the through hole 17 is reduced, and the passage through the through hole 17 is smoothly obtained. It is supposed to be.

  The nut member 19 has a flat surface 19a that comes into contact with the back surface of the slab mold frame 16, and the flat surface 19a has anti-rotation projections 25 that bite into the bottom surface of the slab mold frame at both end positions. And the spring member coupling | bond part 26 is provided so that the circumference | surroundings of the screw hole 23 may be enclosed.

  With such a configuration, it is possible to prevent the nut member 19 from rotating together with the screw member 22 being screwed. In other words, by biting into the lower surface of the slab form 16, the slab form 16 can be reused over a long period of time, with the effect of preventing construction failure and requiring only minimal scratches. Become.

  Further, by providing a spring member coupling portion 26 surrounding the periphery of the screw hole 23, the spring member coupling portion 26 is accommodated on the inner periphery of the through hole of the slab mold 16, and the shaft core and the nut member of the through hole 17 are accommodated. When the shaft core of the screw hole 23 approaches and the opening of the screw hole 23 approaches the upper surface side, the screw member 22 can be smoothly screwed in during construction.

  In an example of the spring member 20, the metal wire is formed by a coil spring in which a taper-shaped metal wire that is wound to the left is in close contact, and a small-diameter side end is accommodated in the through-hole 17 and has a larger diameter than the screw hole 23. The side end portion has a slightly larger diameter than the through-hole 17 and can be forced to pass through the through-hole 17 by stretching, and the small-diameter side end portion is placed on the flat surface 19 a side of the nut member 19. The spring member coupling portion 26 is fixed in a coaxial arrangement with the screw hole 23.

  With this configuration, when the screw member 22 is pushed into the nut member 19, the screw member 22 is pushed so as to slide on the inner surface of the taper, and the shaft core of the screw member 22 and the shaft core of the nut member 19 are finally formed. Therefore, there is no screwing failure.

  FIGS. 5A to 5C show different examples of the spring member coupling portion, and the spring member coupling portion 26 of the first example shown in FIG. 5A is a flat surface 19 a of the nut member 19. An outer cylinder 27 and an inner cylinder 28 are provided around the screw hole 23 so as to be coaxial with the screw hole 23, and a small diameter side end of the spring member 20 is placed between the outer cylinder 27 and the inner cylinder 28. The spring member 20 is fixed to the nut member 19 by bending the upper end of 28 outward.

  By doing so, when the screw member 22 is pushed into the nut member 19, a smooth inclined surface is formed by bending the upper end outward, and the screw member 22 collides with the nut member 19 in a plane. There is nothing, and it does not take time for screwing. Further, the spring member 20 and the nut member 19 are physically fixed, and it is possible to prevent the spring member 20 from being detached from the nut member 19 at the time of screwing.

  In the spring member coupling portion 26 of the second example of FIG. 5B, a cylinder 29 protrudes from the flat surface 19 a of the nut member 19 around the screw hole 23 so as to be coaxial with the screw hole 23. A circumferential groove 30 is provided at the root position on the outer periphery of 29, the small diameter side end portion of the spring member 20 is externally fitted to the cylinder 29, and the end portion is elastically fitted to the circumferential groove 30, whereby the spring member 20 is attached to the nut. It is fixed to the member 19.

  By doing so, the assembly of the spring member 20 and the nut member 19 is facilitated, the spring member 20 and the nut member 19 are physically fixed, and the spring member 20 is detached from the nut member 19 during screwing. It can also be prevented.

  In the spring member coupling portion 26 of the third example of FIG. 5C, a tapered cylinder 31 having a large upper end around the screw hole 23 on the flat surface 19 a of the nut member 19 is arranged coaxially with the screw hole 23. The spring member 20 is fixed to the nut member 19 by elastically fitting the small diameter side end of the spring member 20 to the tapered cylinder 31.

  By doing in this way, when the latching area of the spring member 20 and the nut member 19 expands, it becomes difficult for the spring member 20 to remove | deviate from the nut member 19 at the time of screwing, and when letting it pass to the through-hole 17 of the slab formwork 16 The spring member 20 extends, but since it is wound around the nut member 19 in a tapered shape, it is possible to prevent local stress concentration due to the extension, and it is possible to prevent the spring from being fully extended after insertion.

  Each of the spring member coupling portions 26 described above is set to an outer diameter that can be accommodated in the through hole 17 of the slab mold 16, and the spring member 20 fixed to the nut member 19 has a larger diameter end larger than the through hole 17. Therefore, even if the nut member 19 is placed vertically and passed through the through hole 17 from the upper surface of the slab mold 16, the spring member 20 is prevented from coming off and does not fall to the back side of the slab mold 19.

  The hook member 21 uses a strip-shaped metal plate, and is hooked to the void-type frame base 11 at the upper end of the vertical plate 21a, so that the hook portion 21b bends to one side and the bend to bend to the other side at the lower end. The bent piece 21 c is formed above the upper surface of the slab mold 16 in a suspended state in which the hook 21 b is locked to the lower center position of the receiving member 12 in the void mold frame base 11. The vertical dimension is such that it is positioned, and a screw insertion hole 32 is provided in the bent piece 21c.

  Note that it is preferable to provide reinforcing ribs for the purpose of improving the strength of both the hook portion 21b and the bent piece 21c. The most important thing in this configuration is that the hook portion 21b and the bent piece 21c are arranged so as to be separated from each other. This is because when the screw member 22 is positioned so as to be separated from each other, the screw member 22 is threaded, and after the nut member 19 is in close contact with the slab formwork, the screw shaft 34 of the screw member 22 is threaded. This is because it can be bent from the portion. This is because the bending occurs because the hook portion 21b and the bent piece 21c are positioned so as to be separated from each other.

  In addition, when the screw shaft 34 to be described later is cut off by curving the screw shaft 34, the effect of preventing rotation is enhanced.

  The screw member 22 has a length such that a screw shaft 34 having a head 33 at one end protrudes a predetermined length from the back side of the slab mold 16 in a state where the screw shaft 34 is inserted into the screw insertion hole 32 of the hook member 21. A threaded portion 35 is provided in the middle of the screw shaft 34 and an engaging portion 36 of a rotary tool is provided at the tip.

  The screw member 22 is set so that the male screw of the screw shaft 34 is screwed into the screw hole 23 of the nut member 19, and the head 33 is formed in a polygon such as a hexagon to prevent rotation after the concrete is hardened, The threaded portion 35 is formed by cutting a V-shaped circumferential groove on the screw shaft 34 to partially reduce the diameter of the screw shaft 34, and the position of the threaded portion 35 from the head 33 is located on the hook member 21. It is set to be equal to or above the upper surface of the slab mold 16 in a state where the slab mold 16 is inserted through the screw insertion hole 32 provided in the bent piece 21c.

  Further, the rotary tool engaging portion 36 provided at the tip of the screw shaft 34 is formed by cutting both sides sandwiching the shaft center into a flat surface to form an oval having a length of 5 mm or more. 38 is engaged so that a rotational force can be applied to the screw shaft 34. It should be noted that the tip is not limited to an oval shape but may be a polygonal shape so that a tool can be engaged.

  The fixing device 18 of the present invention is configured as described above. Next, a method for constructing a void slab using the fixing device 18 will be described.

  As shown in FIG. 6A, a through-hole 17 is previously drilled at a position where the void-type frame base 11 of the slab mold 16 is fixed, and a long hole is formed from the upper surface of the slab mold 16 to the through-hole 17. A nut member 19 having a vertical direction and a spring member 20 deformed so as to overlap the flat surface 19a of the nut member 19 are inserted, and the nut member 19 is pushed in at the tip of the screw member 22, whereby the nut member 19 is It passes through the back side of the slab formwork 16.

  At this time, the spring member 20 is deformed and stretched so as to be accommodated in the through-hole 17, but by leaving the large-diameter end portion on the upper surface of the slab mold 16, the nut member 19 is placed on the back surface of the slab mold 16. The spring member 20 does not pass through the through hole 17 even if it is passed to the side, and therefore the nut member 19 is not dropped to the back side of the slab mold 16.

  When the entire length of the nut member 19 passes through the through hole 17, the spring member 20 is restored to a tapered coil shape by its own elasticity and contracts, and its large diameter end engages with the upper end of the through hole 17 and moves downward. Therefore, the nut member 19 is pulled up at the center position. Therefore, the nut member 19 is in a horizontal state, the flat surface 19a is pressed against the back surface of the slab mold 16, and the screw hole 23 is formed. A state of being coaxial with the through hole 17 is obtained.

  As described above, the nut member 19 can be attached to the slab mold 16 by one worker from the upper surface of the slab mold 16.

  Next, the void type frame base 11 is placed on the upper surface of the slab form frame 16 at a position close to the through hole 17, and the upper end hook portion 21 b is placed on the receiving member of the void type frame base 11 as shown in FIG. The position of the void frame 11 is determined so that the screw insertion hole 32 of the hook member 21 locked to the position 12 is directly above the through hole 17, and the screw member 22 inserted from above into the screw insertion hole 32 of the hook member 21. The screw shaft 34 is inserted into the spring member 20 accommodated in the through-hole 17, and the screw shaft 34 is screwed into the screw hole 23 of the nut member 19 by rotating the screw member 22.

  When the screw member 22 is screwed into the screw hole 23 of the nut member 19 as shown in FIG. 6C, the nut member 19 is attracted to the slab mold 16 and the flat surface 19a is pressed against the back surface of the slab mold 16 at the same time. The void-type frame base 11 is pulled down together with the hook member 21, and the void-type frame base 11 is fixed on the slab form frame 16.

  At this time, since the protrusion 25 is provided on the flat surface 19a of the screw member 19 that is pressed against the back surface of the slab mold 16, this bites into the back surface of the slab mold 16, and the nut member 19 rotates together when the screw member 22 is screwed. And the screw member 22 can be screwed in without any trouble, and since the spring member 20 is formed in a left-handed taper coil, the screw member 22 of the right screw is used as the screw hole of the nut member 19. When the screw member 22 is screwed, it is possible to prevent the screw member 22 from being screwed and tightened and the screw member 22 from being disabled.

  Further, even if the rightward rotation force accompanying the screwing of the screw member 22 acts on the nut member 19, the nut member 19 is not separated from the slab formwork 16 (in the case of right-handed winding, in the screw screwing direction). The nut member 19 comes close to the slab mold 16 by screwing the screw member 22 into the slab mold 16 by turning the spring member 20 counterclockwise. It becomes possible to improve the workability.

  As described above, when the void formwork base 11 is fixed on the slab formwork 16, the void formwork 14 is placed on the void formwork base 11 as shown in FIG. It fixes to the mount frame 11, and in this state, as shown in FIG.7 (b), the concrete 37 is cast on the slab formwork 16, and a void slab is formed.

  Since the void form 14 has a hollow interior with both ends closed, buoyancy is generated when the concrete 37 is placed. However, the slab form 16 is provided via the void form frame mount 11 and the fixing device 18. Since it is fixed above, there is no occurrence of lifting due to buoyancy, and a void slab having a void at a predetermined position can be constructed.

  When the void slab concrete 37 is solidified, the rotary tool 38 is engaged with the engaging portion 36 of the screw member 22 protruding from the lower surface of the slab form 16 as shown in FIG. When the rotational force is applied to the screw shaft 34, the screw member 22 that is prevented from rotating by the head 33 being embedded in the concrete 37 and the screw shaft 34 being curved is loaded on the threaded portion 35 provided on the screw shaft 34. As a result, the threaded portion 35 of the screw shaft 34 is cut off.

  When the threaded portion 35 is broken, as shown in FIG. 8B, when the rotary tool 38 is removed and the tip of the screw shaft 34 is pulled down by hand, the threaded tip side of the screw shaft 34 is removed from the through hole 17. When the spring member 20 is pulled out and finally pulled so that the large-diameter end of the spring member 20 comes out of the through-hole 17, the threaded tip end side of the screw shaft 34 and the spring member 20 are slabded as shown in FIG. The slab mold 16 can be detached from the slab mold 16, and the slab mold 16 can be disassembled without any trouble.

DESCRIPTION OF SYMBOLS 11 Void type frame mount 12 Receiving member 13 Support leg 14 Void type frame 15 Wire material 16 Slab type frame 17 Through-hole 18 Fixing device 19 Nut member 20 Spring member 21 Hook member 22 Screw member 23 Screw hole 24 Rib 25 Protrusion for rotation prevention 26 Spring member coupling part 27 Outer cylinder 28 Inner cylinder 29 Cylinder 30 Circumferential groove 31 Tapered cylinder 32 Screw insertion hole 33 Head 34 Screw shaft 35 Thread cutting part 36 Engagement part

Claims (4)

A void type frame base fixing device for fixing a void type frame base installed on the upper surface of the slab form frame to the slab form frame using a through hole provided in the slab type frame,
A screw hole is provided in the middle portion in the longitudinal direction, having a width and thickness that allows the through hole of the slab form to pass through, and a length longer than the diameter of the through hole. A nut member,
Tapered shape that allows the small diameter side end to fit inside the through hole and have a larger diameter than the screw hole, and the large diameter side end to have a larger diameter than the through hole, and can be forced to pass through the through hole. A spring member that is fixed to the one side of the nut member with the screw hole and coaxially arranged,
A hook member that locks to the void formwork frame at the top, and a hook member that is provided with a screw insertion hole at the bottom;
A screw member screwed into the screw hole of the nut member from the screw insertion hole of the hook member,
The screw member has a length in which a screw shaft having a head at one end protrudes to the back side of the slab mold in a state where the screw shaft is inserted into the screw insertion hole of the hook member, and a threaded portion is provided in the middle of the screw shaft. A device for fixing a void type frame base having an engagement portion of a rotary tool at the tip.   The nut member has a semi-circular cross section in the thickness direction so that the contact surface with the back surface of the slab form is flat, and the contact surface has a protrusion for preventing rotation and a spring member coupling portion surrounding the screw hole. The void type frame mount fixing device according to claim 1, which is provided.   The void type frame mount fixing device according to claim 1, wherein the spring member is formed of a coil spring in which a metal wire is wound to the left.   The screw member has a polygonal head portion, and a threaded portion provided in the middle of the screw shaft is inserted in the screw insertion hole of the hook member, and is positioned equal to or above the upper surface of the slab formwork. The void type frame mount fixing device according to any one of claims 1 to 3, wherein the fixing device is set as described above.

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