JP2909411B2 - Fixture for formwork tightening bolt - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixing device for a form clamping bolt used for fixing an end of a bolt for clamping a form to a form in a form assembling of concrete work.

[0002]

2. Description of the Related Art Heretofore, this type of fixing tool for forming bolts is generally formed by plastic molding in a generally cubic shape, and has a screw hole which can be screwed with a screw shaft end of the forming bolt. However, a nail with a nail hole in the direction perpendicular to this screw hole is used, but the nail remains in the fixture buried in the solidified concrete after dismantling the formwork, and the nail is removed from the concrete wall surface. To protrude, the protruding part of the nail had to be cut and removed.

As an improvement, a support hole is formed in the fixture body at right angles to the screw holes for bolts, and a nail holder having a nail hole is supported by the fixture body while maintaining a predetermined coupling strength. Provided in the hole, when dismantling the formwork,
A fixture has been put into practical use in which a nail and a nail holder are integrally removed together with a formwork from a support hole of the fixture body so that the nail does not remain on the concrete wall surface (see Japanese Utility Model Application Publication No. 53-53).
No. 30708, Japanese Utility Model Publication No. 61-2755).

When using these fixtures, for example, as shown in FIG. 8, the fixture 1 is placed at several places on a concrete formwork 21 for a floor slab 26, and the formwork is passed through the nail holes. The fixture 1 is fixed to the formwork 21 by nailing to the mold 21. The bolt 8 is horizontally passed through a wall form 22 orthogonal to the form 21, one end of the bolt 8 is screwed into the screw hole 9 </ b> A of the fixture 1, and the other end of the bolt 8 is connected to the wall form 2.
2 and is fixed by tightening with a nut 25.
The wall form 22 thus fastened with the bolts 8 is
Even if pressure is applied to the inner surface of the frame by the inflow of concrete, the frame is prevented from being displaced outward. The nail holder 12 is accommodated in the support hole 11 provided in the fixture main body 2 while maintaining a predetermined coupling strength, and the nail holder 12 and the nail 15 are integrally fixed together with the form when the form is dismantled. By pulling out the tool body 2, it is not necessary to cut and remove the protruding portion of the nail 15 from the floor slab 26 at the time of dismantling the formwork. Note that the strength of coupling the nail holder 12 into the support hole 11 of the fixture body 2 is smaller than the coupling strength of the nail 15 with the mold 21, and the nail holder 12 is removed when the mold 21 is removed. It is set to such a degree that it can be easily separated from the support hole 11.

[0005]

SUMMARY OF THE INVENTION As described above, a fixture for a mold fastening bolt in which a nail holder having a nail hole is detachably housed and connected in a support hole of a fixture body, the mold disassembly is performed. It is not necessary to remove the protruding portion of the nail later, which is convenient. However, there is a problem that the fastener body 2 may fall off from the nail holder 12 when the bolt 8 is tightened in assembling the formwork. there were.

The reason will be described with reference to the principle diagram of FIG. FIG. 9A shows that the nail holder 12 and the fixture main body 2 in the support hole 11 are connected by the thin piece 14, and the axis of the support hole 11 and the nail holder 12 is in the direction of the tension T of the bolt 8. , And shows a state in which the nail holder 12 is driven into the formwork 21. The bonding strength of the lamella 14 between the nail holder 12 and the fixture main body 2 in the support hole 11 is set sufficiently smaller than the bonding strength between the nail 15 and the mold 21. When dismantling, form 2
1, the nail 15 and the nail holder 12 are integrally formed so as to be easily pulled out from the fixture body 2 embedded and fixed in concrete.

When the bolt 8 is tightened, a tension T acts on the fixture main body 2 as shown in FIG. 9B, causing the fixture main body 2, the nail holder 12 and the nail 15 to bend in the tension T direction. In particular, it is attempted to rotate the fixture body 2 upward Y about the point P.

When the tension T exceeds a predetermined value, the joint of the thin piece 14 is broken by the rotation of the fixture main body 2 about the point P, and the fixture shown in FIG. The main body 2 is pulled upward from the nail holder 12 fixed to the mold 21 by the nail 15. At this time, since the nail holder 12 is bent in the tension T direction, it is impossible to prevent the fixing body 2 from being pulled out.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to provide a highly-reliable fixture for a form-tightening bolt capable of ensuring stable operation.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention solves the above-mentioned problem by providing a fastener for a form clamping bolt in which a nail holder having a nail hole is detachably housed and connected in a support hole of a fixture body. , The support hole is set so that the axial direction of the support hole is inclined with respect to the axial direction of the screw hole for bolt screwing provided in the fixture body.

The angle between the two axial directions is 70 ° to 85 °.
Is preferably within the range.

[0012]

The operation of the present invention will be described with reference to the principle diagram of FIG.
That is, as shown in FIG. 7A, the axial direction S of the support hole 11 of the fixing body 2 is inclined with respect to the axial direction Q of the screw hole for bolt screwing provided in the fixing body 2. When tightening the bolt, as shown in FIG. 7 (b),
Due to the tension T acting in the Q direction, even if the fixture main body 2 and the associated nail holders 12 and 15 attempt to rotate about the fulcrum P, the nail holder fixed to the formwork 21 by the nails 15 is used. The axial direction S of the body 12 (which is the same as the axial direction of the support hole 11) maintains a direction in which the fixture body 2 can be prevented from being detached, so that the connection by the thin pieces 14 can be maintained, and The fixture body 2 can be prevented from being detached during tightening.

The angle θ between the two axis directions Q and S is 70 ° to 8 °.
When the angle is set within the range of 5 °, the above operation can be performed more reliably.

The axial direction of the nail hole 13 can coincide with the axial direction S of the support hole 11 as shown in FIG. 7A, but is not limited to this. If the center direction is set so as to be perpendicular to the axial center direction Q of the screw hole for bolt screwing, the nailing operation can be performed smoothly as in the conventional example.

[0015]

FIG. 1 is a schematic cross-sectional view of a fixture 1 for a form clamping bolt according to one schematic embodiment of the present invention. In FIG. 1, reference numeral 2 denotes a fixture body made of a material having a good release property from concrete, for example, PTFE (polytetrafluoroethylene) resin or the like, and has a parallelogram-shaped block in cross section. A bolt hole 7 extending in the direction from the front end face 5 to the rear end face 6 between the upper and lower surfaces 3 and 4 parallel to each other is formed in the fixture main body 2 in parallel with the upper and lower surfaces 3 and 4. A nut 9 for screwing the bolt 8 is embedded. The axis of the screw hole 9A of the nut 9 is formed coaxially with the axis of the bolt hole 7. Although the bolt hole 7 may be a through hole, it is preferable that the outlet side portion 10 (the right end in the figure) is closed. This is to prevent the bolt 8 from being accidentally inserted from the right side of the drawing. One or both of the front and rear end surfaces 5 and 6 may be formed perpendicular to the lower surface 4.

The fixture body 2 further includes upper and lower surfaces 3, 4
A plurality of composites each comprising a pair of a cylindrical nail holder 12 having a nail hole 13 and a support hole 11 for accommodating and coupling the cylindrical nail holder 13 are arranged in parallel with each other with their axes parallel to each other. S is formed so as to incline to the upper right in the figure with respect to the screw hole axis direction Q and the fixture lower surface 4, and the nail holder 12 is separated from the fixture main body 2 by applying an appropriate force when removing the formwork. It is configured to be detachable.

The nail hole 13 is coaxial with the nail holder 12 and has a lower surface 4.
Are formed to be inclined with respect to.

The crossing angle θ between the axial direction Q of the screw hole and the axial direction S of the support hole 11 is, for example, 70 ° to 85 °.
° is preferable.

Due to the above inclination, even if tension is applied to the fixture when the mold is tightened with bolts, as described above,
The trouble that the fixture body 2 rises upward in the drawing (the direction opposite to the nail pulling-out direction) and separates from the nail holder 12 can be prevented. When the crossing angle θ is too large, the effect of preventing the lifting and dropping of the fixture body is diminished, and when the crossing angle θ is too small, the nail holder is pulled out when the formwork is dismantled. In this case, an extra force is required, so that the crossing angle θ is preferably set in the range of 70 ° to 85 °. In addition, it is preferable that the axes of the plurality of composites have the same inclination angle and are parallel to each other from the viewpoint of easiness of manufacture and the like, but the inclination angles of the axes are slightly different for each pair. However, there is no particular problem in principle.

As an example of a specific method of connecting the nail holder 12 and the fixture body 2 so that the nail holder 12 can be detached from the fixture body 2 with a predetermined force or more, the diameter of the support hole 11 is set to the nail holder 1.
2, the nail holder 12 is formed so as to be able to slide in the support hole 11 so that there is no backlash between the two, and the wall surface forming the support hole 11 and the nail holder 12 For example, a configuration may be adopted in which the connecting portion 14 made of a thin piece is provided radially or annularly between them. This allows
At the time of dismantling the formwork, the nail holder 12 and the nail 15 can be reliably separated from the fixture main body 2 integrally. It is preferable to form the fixture having such a configuration by integral molding of the same material in terms of reduction of manufacturing cost, labor saving, and certainty of the pulling operation. Since the detailed configuration is described in the above-mentioned Japanese Utility Model Publication No. 61-2755,
Description is omitted.

Another specific method for connecting the nail holder 12 to the fixture main body 2 so that the nail holder 12 can be detached from the fixture main body 2 with a predetermined force or more is a fixture for form clamping bolts. There is one in which a nail holder having a nail hole into which a nail is inserted is press-fitted into a support hole of the fixture body. Thus, when removing the concrete formwork, the nail can be pulled out of the fixture body together with the nail holder, and the outer diameter of the nail holder and the hole diameter of the support hole can be press-fitted to each other, and the The dimensional relationship between the nail and the concrete form is set such that the binding force due to friction is smaller than the binding force due to friction between the nail and the concrete formwork. For more information on this, see Jpn.
Since it is described in the official gazette, details are omitted.

FIG. 2 is a schematic view of a fixing device for a form clamping bolt according to another schematic embodiment of the present invention, which is the same as the embodiment of FIG. Elements common to FIG. 1 are denoted by the same reference numerals. In FIG.
The nail hole 13 for nailing is formed in the lower surface 4 of the fixture body 2 in a vertical direction, and the nailing operation is easier than in the case of FIG.

FIG. 3 shows a fixing device 1 for a form-tightening bolt according to a specific embodiment of the present invention, and the symbols of the respective parts in the drawings are commonly used in FIGS. 3A is a plan view, FIG. 3B is a cross-sectional view taken along line LL ′ in FIG. 3A, and FIG. 3C is a cross-sectional view taken along line MM ′ in FIG. In the configuration of FIG. 3, a complex including a support hole 11 and a nail holder 12 is provided at the four corners of the fixture main body 2 at an angle to the lower surface 4, and a part of the wall surface forming the support hole 11 is provided. It is formed on a curved surface. The nail hole 13 is the support hole 1 in the figure.
1. Although it is provided obliquely with respect to the lower surface 4 of the fixture body 2 coaxially with the nail holder 12, the nail hole 13 may be formed perpendicular to the lower surface 4.

Referring to FIG. 3 in detail, reference numeral 2 denotes a fixture body made of a material having good releasability from concrete, for example, PTFE (polytetrafluoroethylene) resin or the like, and a block having a substantially parallelogram cross section. It is formed with. In the center of the fixture body 2, upper and lower surfaces 3,
4 between the front end face 5 and the rear end face 6
Is formed parallel to the lower surface 4, and a nut 9 for screwing the bolt 8 is buried substantially in the center of the bolt hole 7.
The bolt hole 7 may be a through hole, but it is preferable that the outlet side portion be closed. This is to prevent a possibility that the bolt is inserted from the right side of the drawing by mistake.

The fixture body 2 further includes upper and lower surfaces 3, 4
A plurality of composites each comprising a pair of a cylindrical nail holder 12 having a nail hole 13 for driving nails and a support hole 11 for coaxially accommodating the same, a plurality of composites each having an axis parallel to the lower surface 4. The nail holding body 12 can be detached from the fixture body 2 by applying an appropriate force to each of them.

FIG. 4 shows a fixing device for a form-tightening bolt according to another specific embodiment of the present invention, and the symbols of the respective parts in the drawings are commonly used in FIGS. 1, 2 and 3. In the configuration of FIG. 4, the support holes 11, the nail holders 12, and the nail holes 13 are the same as those in FIG. 3, but the fixture main body 2 has a portion 2B having the support holes 11, the nail holders 12, and a portion thereof. It is divided into a bolt insertion portion 2A extending in the lateral direction from 2B, a bolt hole 7 and a nut 9 are provided in the bolt insertion portion 2A as shown in the figure, and the bolt hole 7 extends halfway of the portion 2B. The upper surface of the fixture body 2 has a step between the 2A portion and the 2B portion, but the lower surface 4 serving as a surface to be attached to the mold is partially discontinuous, but forms the same plane as a whole. ing. In FIG. 4 as well, the nail hole 13 may be formed perpendicular to the lower surface 4.

FIG. 5 is an explanatory view of the use of the fixture 1 for the form clamping bolt of the embodiment of FIG. 3. First, the fixture is put in place on the form 21 for the concrete floor slab 26 at the time of assembling the temporary form. The nail 15 is driven into the nail holders 12 from the upper surface 3 with the nails 1 placed thereon, and the mold 2 is passed through the nail holders 12.
Fix to 1.

In order to fix the vertical mold 22, the bolt 8 is screwed into the nut 9 of the fixture body 2 through a hole provided in the mold 22, and the nut 8 is fixed to the nut 9 through the wood 23 and the washer 24. Tighten by 25. At this time, as shown in FIG. 7, according to the present invention, since the axis of the nail holder 12 is inclined as described above, the bolt 2 is tightened to fix the fixture 2 to the left in the figure. Even if the pulling force T acts, there is no possibility that the fixture body 2 will fall off the nail holder 12 and lose the function of the fixture, and the mold can be stably assembled.

After assembling the temporary frame, concrete is poured into the molds 21 and 22 to form floor slabs 26, walls 27 and the like. At this time, an inward pressure (side pressure) is applied to the inner surface of the mold 22 by the inflow of concrete. ), But the fixture 1 and the bolts 8 are used so that the formwork 22 does not move outward.
As a result, movement in that direction is prevented.

After curing and hardening of the concrete, the mold 2
1, 22 are removed. For example, formwork 2 for floor slab 26
At the time of removing 1, the mold 21 is pulled downward to separate from the lower surface of the floor slab 26, and at this time, the nail 15 connected to the mold 21 is also pulled downward with the removal of the mold 21, The head of the nail 15 strongly presses the upper surface of the nail holder, the thin piece 14 is torn off, and the nail holder 12 and the nail 15 are detached from the fixture body 2 as a unit and removed from the floor slab 26.

FIG. 6 is an explanatory view of the use of the fixture for the form-tightening bolt of the embodiment of FIG. 4, which is the same as the explanatory view of the use of FIG.

[0032]

According to the present invention, while removing the mold, the nail can be reliably and efficiently pulled out of the fixture body together with the nail holder, and the fixture body can be fixed to the nail holder when the mold is fastened and fixed by bolts. It is possible to provide a fixture for a form-tightening bolt, which eliminates the possibility of being lifted off and falling off, and has a stable and reliable function.

[Brief description of the drawings]

FIG. 1 is a schematic embodiment diagram of the present invention.

FIG. 2 is another schematic embodiment diagram of the present invention.

FIG. 3 is a view showing a specific embodiment of the fixing device of the present invention.

FIG. 4 is a view showing another specific embodiment of the fixing device of the present invention.

FIG. 5 is an explanatory diagram of a use state of the device of FIG. 3;

FIG. 6 is an explanatory diagram of a use state of the device of FIG. 4;

FIG. 7 is an operation explanatory diagram of the present invention.

FIG. 8 is a diagram showing a conventional device.

FIG. 9 is a diagram illustrating the operation of a conventional device.

[Explanation of symbols]

 DESCRIPTION OF REFERENCE NUMERALS 1 Fixture for form tightening bolt 2 Fixture main body 8 Bolt 9 Nut 9A Screw hole 11 Support hole 12 Nail holder 13 Nail hole 14 Flake connecting part 15 Nail 22, 22 Formwork Q Axis of screw hole for bolt screwing Direction S Axial direction of support hole θ Angle between both axial directions

Claims (6)

(57) [Claims] 1. A fastener for a form-tightening bolt in which a nail holder having a nail hole is removably housed and connected in a support hole of a fixture body, wherein a screw hole for a bolt screw provided in the fixture body is provided. A fixture for a form-tightening bolt, wherein the axial direction of the support hole is set to be inclined with respect to the axial direction. 2. The fixture for formwork fastening bolts according to claim 1, wherein the angle between the two axial directions is in the range of 70 ° to 85 °. 3. The fixture for formwork tightening bolts according to claim 1, wherein the axial direction of the nail holes coincides with the axial direction of the support holes. 4. The fixture for formwork tightening bolts according to claim 1, wherein the axial direction of the nail holes is orthogonal to the axial direction of the screw holes for screwing the bolts. 5. The nail holder according to claim 1, wherein the nail holder is detachably housed and connected via a thin piece in a support hole of the fixture body.
The fixture for a form-tightening bolt according to 2, 3, or 4. 6. The nail holder according to claim 1, wherein said nail holder is press-fitted and detachably housed and connected in a support hole of said fixture body.
5. The fixture for a form-tightening bolt according to 3 or 4.