JPH072865Y2 - Fixing tool body for PC steel - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a structure for mounting a fixing tool main body in a fixing tool for PC steel used in manufacturing a prestressed concrete member to a mold.

[Conventional technology]

Conventionally, as a mounting structure of a PC steel fixing device main body used for manufacturing a prestressed concrete member, as shown in FIG. 16, a sheath connecting cylinder 13 is provided in front of a pressure bearing plate 2 having a PC steel material inserting through hole 1. And a large-diameter cylindrical body 14 having a female screw on the rear portion of the bearing plate 2 to form a fixing device main body 15, and a PC steel rod 16 having a male screw on the end portion.
The end of the sheath 17 is inserted into the through hole 1 of the bearing plate 2, the end of the sheath 17 covering the PC steel rod 16 is inserted into the sheath connecting cylinder 13, and the nut 18 screwed to the PC steel rod 16 is inserted. Is attached to the rear surface of the bearing plate 2, and a screw rod lid 22 is formed by integrally connecting a screw rod 21 to the center of the rear portion of a screw lid 20 having a grout material injection hole 19.
The screw lid 20 in is screwed to the female screw of the cylindrical body 14,
Further, insert the screw rod 21 of the lid 22 with the screw rod into the through hole of the mold 23,
Tighten the mold tightening nut 24 screwed to the screw rod 21,
A mounting structure is known in which the mold 23 is pressed against the rear surface of the screw lid 20.

Then, after the concrete 25 cast on the outside of the sheath 17 and the fixing tool main body 15 is hardened, the mold 22 is removed and the lid 22 with a screw rod is removed, and then the end of the PC steel rod 16 is connected to one end of the pulling rod. The nut 18 is rotated in the tightening direction and engaged with the bearing plate 2 while being connected via a screw type coupling and tensioning the PC steel rod 16 through the pulling rod by the pulling jack. Next, after removing the pulling rod from the PC steel rod 16, the lid 22 with a rod is screwed into the cylindrical body 14, and the grout material injection hole 19 is used to grout cement milk or the like inside the sheath 17 and the fixing tool main body 15. The material is being injected.

[Problems to be solved by the device]

In the case of the conventional mounting structure of the PC steel fixing device main body, a process of cutting and forming a female screw inside the large-diameter cylindrical body 14 and a process of cutting and forming a male screw on the outer circumference of the large-diameter lid 20 are performed. No, therefore, the processing becomes complicated and costly, and when the screwed lid 22 is screwed and set on the cylindrical body 14 of the fixing tool main body 15, the screwed lid 22 must be continuously rotated. It takes a long time to set.

Further, the lid 22 with a screw rod is screwed and unscrewed with respect to the fixing device main body 15 and repeatedly used, but in a state where the lid 22 with a screw rod is screwed with the fixing device main body 15, from the grout material injection hole 19 Since the grout material is injected through the inside of the fixing tool main body 15, the grout material may invade into the threaded portion between the fixing tool main body 15 and the lid 22 with the screw rod and harden, so that the lid 22 with the screw rod is inserted.
It may be difficult to unscrew the lid and the lid with the screw rod
When the 22 is reused, the grout material that has adhered to the male screw of the threaded lid 22 and hardened must be removed in advance with a wire brush or the like, which is complicated.

Further, the conventional mounting structure of the fixing member for PC steel material can be adopted when using a steel rod as the PC steel material, but cannot be adopted when using a steel wire bundle or a steel twisted wire as the PC steel material. is there.

This invention solves the problems of the conventional fixing body mounting structure, has a simple structure and can be manufactured at low cost, and the locking metal fittings can be quickly attached to and detached from the fixing body. It is an object of the present invention to provide a fixing structure for a fixing body for a PC steel material which can be adopted when any of a steel rod, a steel wire bundle, and a steel stranded wire is used as the steel material.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, in the mounting structure of the main body of the fixing tool for PC steel material of the present invention, the front part of the cylindrical body 3 is fixed to the rear part of the pressure plate 2 having the through hole 1 for inserting PC steel material, And on both sides in the diametrical direction on the rear inner surface of the cylindrical body 3,
The fixing tool body 5 is configured by fixing the pair of arcuate locking pieces 4 and the center of the locking plate 6 having an end width d smaller than the end spacing D of the pair of arcuate locking pieces 4. The front end of a PC steel material insertion tube 8 having a male screw 7 on the outer periphery is inserted and fixed to the portion to form a locking metal fitting 9, and the locking plate 6 in the locking metal fitting 9 has the pair of arcuate shapes. After being inserted into the cylindrical body 3 through the end portions of the locking pieces 4 and rotated, they are arranged so as to engage with the front portions of the arc-shaped locking pieces 4, and The end portion is directly or indirectly engaged with the inner surface of the mold 10, the tube 8 of the locking metal fitting 9 is inserted into the through hole 11 of the mold 10, and the tube 8 is provided outside the mold 10 to the tube 8. The fixing nut 12 is screwed.

[Action]

When both ends of the locking plate 6 in the locking metal fitting 9 are inserted into the cylindrical body 3 through both ends of the pair of arcuate locking locking pieces 4, and then the locking metal fitting 9 is rotated about 90 °. , Both ends of the locking plate 6 in the locking metal fitting 9 can be engaged with the front parts of the pair of arc-shaped locking pieces 4, and the locking metal fitting 9 is rotated about 90 ° to form a pair of arc-shaped locking metal pieces. The locking fitting 9 can be removed from the fixing device main body 5 by moving it backward after removing it from the locking piece 4.

The locking plate 6 of the locking metal fitting 9 is engaged with the front portions of the pair of arcuate locking pieces 4 in the fixing tool main body 5, and the PC steel material inserting pipe body 8 of the locking metal fitting 9 is inserted into the frame 10. The fixing tool main body 5 is fixed to the mold 10 by inserting the fixing nut 12 into the male screw 7 of the PC steel material inserting tube body 8 on the outside of the mold 10 through the hole 11 and tightening.

〔Example〕

 Next, the present invention will be described in detail with reference to the illustrated example.

3 to 5 show a metal fixing device main body 5 used in the embodiment of the present invention, in which a PC is provided at the center.
A rear end portion of a sheath connecting tube 13 communicating with the through hole 1 is fixed by welding to a front portion of a pressure bearing plate 2 having a through hole 1 for inserting a steel material. A front end of a large-diameter cylindrical body 3 arranged concentrically with the hole 1 is fixed by welding, and a pair of arcuate locking pieces made of a metal wire rod are provided on both inner sides of the rear surface of the cylindrical body 3 in the diametrical direction. 4 are abutted and fixed by welding, and rotation preventing stoppers projecting forward are provided at both ends of the arcuate locking piece 4.
26 are provided in a bent manner, and an end portion interval D is provided between both end portions of each arcuate locking piece 4, and the pressure bearing plate 2 has an inner peripheral surface from the inner peripheral surface of the through hole 1 to an inner peripheral surface of the cylindrical body 3. A grout material injection hole 27 extending in an inclined state toward the rear surface of the pressure plate near the surface is provided.

FIGS. 6 to 8 show a metal locking metal fitting 9 used in the embodiment of the present invention, which has an end width d smaller than the end distance D between the pair of arcuate locking pieces 4. A through hole is provided in the central portion of the locking plate 6 having a hole, and the front end small-diameter portion of the PC steel material inserting tube body 8 having a male screw 7 on the outer periphery is fitted into the through hole of the locking plate 6, 6 for PC steel insertion tube 8
Are fixed by welding, and a direction indicating hole 28 indicating the longitudinal direction of the locking plate 6 is provided at the rear end of the PC steel material inserting tube 8.
Is provided.

9 and 10 show a grout injection lid attachment 29 used in connection with an embodiment of the present invention, in which a bolt 31 is inserted into the central portion of a metal support plate 30 and fixed by welding. The nut 32 is screwed into the bolt 31.

FIG. 11 shows a grout injection lid 33 used in connection with the embodiment of the present invention, in which a through hole 35 for bolt insertion is provided in the center of a metal disk 34, and the disk 34 of the disk 34 is provided. An eccentric through hole 36 for inserting a grout hose is provided at an eccentric position.

FIGS. 1 and 2 show a fixing structure for a PC steel fixing tool body according to an embodiment of the present invention, which uses the fixing tool body 5 and the locking metal fitting 9, and a sheath in the fixing tool body 5. The connection tube 13 is fitted into the end of the sheath 17 through which the PC steel material 37 is inserted, and the PC is inserted into the PC steel material insertion tube body 8 of the locking metal fitting 9.
The steel material 37 is inserted, and then, as shown by the solid line in FIG. 12,
Both ends of the locking plate 6 in the locking metal fitting 9 are inserted into the cylindrical body 3 through the space between both ends of the pair of arcuate locking locking pieces 4, and then the locking metal fitting 9 is rotated about 90 °. The both ends of the locking plate 6 are arranged so as to face the front part of each arcuate locking piece 4.

Next, the center hole of the rubber lid 38 that closes the rear end portion of the cylindrical body 3, the through hole of the mold 10 and the washer 39 are sequentially fitted into the PC steel material inserting tube body 8 of the locking metal fitting 9, The fixing nut 12 screwed into the PC steel material inserting tube body 8 is tightened on the outside of the mold 10, and the fixing plate 6 of the locking metal fitting 9 interposes each arcuate locking piece 4 to fixer main body. 5 is pressed toward the mold 10, and the fixing tool main body 5 is clamped and fixed to the mold 10 via a rubber lid 38. In addition, inside the formwork 10, concrete is attached to the outside of the fixing tool main body 5 and the sheath 17.
25 are cast.

After the concrete 25 shown in FIGS. 1 and 2 has hardened, the nut 12 is unscrewed, and then the washer 39 and the mold 10
And the rubber lid 38 is removed from the PC steel insertion pipe body 8,
Further, the locking metal fitting 9 is moved forward until the locking plate 6 is positioned in front of the rotation preventing stopper 26, and then the locking metal fitting 9 is moved.
Is rotated about 90 ° and then pulled out from the cylindrical body 3.

Next, as shown in FIG. 13, a sleeve 40 having a tapered hole that expands rearward is arranged inside the cylindrical body 3 while being inserted into the PC steel material 37, and Between the PC steel material 37, a plurality of wedge pieces 41 having an arc-shaped cross section
Is inserted, and then the front surface of the sleeve 40 is engaged with the rear surface of the bearing plate 2 while the PC steel material 37 is tensioned by a tensioning jack (not shown) having a PC steel material clamp. The wedge piece 41 is press-fitted between it and the PC steel material 37, and then the PC steel material 37 is cut at a position between the rear end portion of the cylindrical body 3 and the rear end portion of the wedge piece 41.

Next, as shown in FIG. 14, after the both ends of the support plate 30 in the grout injection lid mounting tool 29 are inserted into the cylindrical body 3 after passing through between the both ends of the pair of arcuate locking pieces 4, The grout injection lid attachment 29 is rotated about 90 ° so that both end portions of the metal support plate 30 are arranged so as to face the front portions of the arcuate locking pieces 4, and the eccentric transparent portion of the grout injection lid 33 is arranged. The grout hose 42 is inserted into the hole 36, the retaining vinyl tape 43 is wrapped around the tip of the grout hose 42, and the through hole 35 at the center of the grout injection lid 33 is further covered with the grout injection lid attachment 29. The bolt 31 is inserted, the nut 32 screwed to the bolt 31 is tightened, the metal supporting plate 30 is engaged with each arcuate locking piece 4, and the grout injection lid 33 is a cylindrical body. 3 is fixed to the rear end face, and then the grout hose
42 to grout materials such as cement milk or mortar 44
Is injected and filled into the sheath 17 and the fixing device main body 5.

After the grout material 44 has hardened, the nut 32 is unscrewed, the grout injection lid 33 and the grout hose 42 are removed, and the protruding portion of the bolt 31 is cut with a chisel or the like.
Next, as shown in FIG. 15, a post-filling mortar 45 is filled in the recess in the rear part of the fixing tool body 5 in the concrete member.

When the present invention is put into practice, as the PC steel material, any of a PC steel rod, a steel wire bundle, and a steel stranded wire may be used.

[Effect of device]

Since the present invention is configured as described above, it has the following effects.

The both ends of the locking plate 6 of the locking metal fitting 9 are inserted into the cylindrical body 3 of the fixing tool main body 5 through the space between the both ends of the pair of arc-shaped locking metal pieces 4, and then the locking metal fitting 9 is attached. Rotate about 90 ° and form the PC steel material insertion tube 8 in the locking fitting 9
The fixing tool body 5 is fixed to the mold 10 by performing a simple operation of inserting the fixing nut 12 into the male screw 7 of the PC steel material inserting tube body 8 and inserting the fixing nut 12 after the insertion through the through hole of 10 It can be fixed easily and quickly, and after the fixing nut 12 is unscrewed and the form 10 is removed, the locking metal fitting 9 is rotated about 90 °, and then the locking metal fitting 9 is moved backward. By performing a simple operation of moving the locking member 9, the locking fitting 9 can be easily and quickly removed from the fixing device main body 5.

Further, since it is not necessary to form a female screw inside the large-diameter cylindrical body 3 by cutting, and it is not necessary to form a male screw to be engaged with the female screw of the cylindrical body 3 with respect to the locking metal fitting 9 by cutting, a fixing tool. The main body 5 and the locking metal fitting 9 can be manufactured at low cost, and as the PC steel material 37, any of a steel rod, a steel wire bundle, and a steel stranded wire can be used.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing a projecting structure of a PC steel fixing device main body according to an embodiment of the present invention, and FIG. 2 is an AA of FIG.
Line enlarged cross-sectional view, FIG. 3 is a vertical sectional side view of the fixing device main body, FIG.
FIG. 5 is a front view thereof, FIG. 5 is a sectional view taken along the line BB of FIG. 3, FIG. 6 is a vertical sectional side view of the locking metal fitting, FIG. 7 is its rear view, and FIG. 8 is C of FIG. FIG. 9 is a side view of the grout injection lid attachment, FIG. 10 is a front view thereof, and FIG. 11 is a front view of the grout injection lid. FIG. 12 is a front view showing a state where the locking plate of the locking metal fitting is inserted and locked in the fixing tool body, and FIG. 13 shows a state in which the sleeve and the wedge piece are fitted to the PC steel material in the fixing tool body. FIG. 14 is a cross-sectional plan view showing a state in which the grout material is ready to be injected, and FIG. 15 is a cross-sectional plan view showing the state in which the grout material is injected and filled and the post-filling mortar is filled. . FIG. 16 is a vertical cross-sectional side view showing a mounting structure of a conventional PC steel fixing device main body. In the figure, 1 is a through hole for inserting a PC steel material, 2 is a pressure bearing plate, 3 is a cylindrical body, 4 is an arc-shaped locking piece, 5 is a fixing tool body, 6 is a locking plate, 7 is a male screw, 8 is a PC steel material. Insertion tube, 9 locking metal fittings, 10 formwork, 12 fixing nuts, 13 sheath connecting tube,
17 is a sheath, 25 is concrete, 26 is a rotation prevention stopper, 27 is a grout material injection hole, 28 is a direction display hole, 29 is a grout injection lid mounting tool, 30 is a metal support plate, 31 is a bolt,
32 is a nut, 33 is a grout injection lid, 36 is an eccentric through hole for inserting a grout hose, 37 is a PC steel material, 38 is a rubber lid, 40 is a sleeve, 41 is a wedge piece, 42 is a grout hose, 44 is a grout material, 45 is a backfill mortar.

Claims (1)

[Scope of utility model registration request] 1. A pressure bearing plate 2 having a through hole 1 for inserting a PC steel material.
The front portion of the cylindrical body 3 is fixed to the rear portion of the cylindrical body 3 and
A pair of arcuate locking pieces 4 are fixed to both sides of the rear inner surface in the diametrical direction to form a fixing tool main body 5, and end portions smaller than the end interval D of the pair of arcuate locking pieces 4 are formed. Width d
Has a male screw 7 on the outer periphery at the center of the locking plate 6 having
The front end portion of the PC steel material inserting tube body 8 is inserted and fixed to form a locking metal fitting 9. The locking plate 6 in the locking metal fitting 9 is
It is inserted into the cylindrical body 3 through the end portions of the pair of arcuate locking pieces 4 and is then rotated so as to be engaged with the front portion of each arcuate locking piece 4. The rear end of the cylindrical body 3 is directly or indirectly engaged with the inner surface of the mold 10, and the tube body 8 of the locking metal fitting 9 is inserted into the through hole 11 of the mold 10,
A mounting structure for a PC steel fixing device main body in which a fixing nut 12 is screwed onto the tube body 8 on the outside of 10.