JP3356738B2 - Concrete formwork spacing support - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an interval holding rod for holding an interval between concrete form plates at a predetermined length, and an interval holding device provided with fixing members for fixing both ends of the interval holding rod. It is.

[0002]

2. Description of the Related Art An example of a conventional spacing device for a concrete form plate is disclosed, for example, in Japanese Utility Model Laid-Open Publication No. Sho 59-124258. The shape of the fixture for fixing the both ends and the method of maintaining the spacing of the form using the same will be described with reference to FIGS.

[0003] As shown in the figure, a spacing rod A is of a straight shaft type, and a large diameter head B is screwed to both ends of the spacing rod A. In addition, the fixture H is a fixture body W
And a fixing device main body V. The fixing device main body W includes a housing portion D for receiving a large-diameter head B at the end of the spacing rod A,
It comprises a head locking portion C for locking the spacing rod A, and a shaft bolt E used when mounting the fixture body W to the concrete form plate.

[0004] A method of maintaining the interval between concrete form plates using such an interval maintaining rod A and a fixture H is described in FIGS.
As shown in FIG. 5, in a concrete form plate arranged so as to face a predetermined length of interval, after reinforcing bars (not shown) are arranged in the form, the fixture body W is connected to the form plate F.
, The shaft bolt E penetrates from the inside to the outside of the form plate F, the shaft bolt E is fixed by the main body fixture V, and the fixture H is attached to the form plate F. At this time, the fixture H is similarly attached to the facing form plate F. Next, large-diameter heads B are attached to both ends of the spacing rod A, and the large-diameter heads B provided at both ends are screw-adjusted in the direction X shown in FIG. This is because the spacing rod A is one of the form plates F
This is performed so as to match the spacing of the accommodation portion D of the fixture main body W attached to the mounting member D with the predetermined length of the accommodation portion D of the fixture main body W attached to the other facing form plate F. After these operations, both ends of the spacing rod A are inserted from above into the accommodating portions D of the corresponding fixture body W, and the spacing rod A is locked by the locking portions C, thereby forming the formwork. The interval between the plates F was maintained at a predetermined length.

[0005]

However, in the construction as shown in the above-mentioned conventional example, in order to insert the end of the spacing rod A into the receiving portion D of the fixture body W, the spacing rod is previously provided at the work site. A large-diameter heads B must be attached to both ends of A. Further, both attached large-diameter heads B are spaced apart from each other by a predetermined length in each of the accommodation portions D of the fixture body W attached to the form plate F. The screws must be adjusted to match. As described above, the work to be performed for each of the large number of spacing rods A is difficult and time-consuming to be performed in a state where the reinforcing bars are complicatedly arranged in the formwork. There is a problem that it is often necessary to perform the operation, which is extremely troublesome and complicated. Further, since the spacing rod A and the large-diameter head B are separately brought into the work site, there is a problem that the number of parts increases. For this reason, in high-altitude work, careful work has been required in order to prevent articles falling due to the increase in the number of parts, and inefficient work has been required.

SUMMARY OF THE INVENTION In view of the above problems, the present invention reduces the number of components and eliminates the need for adjustment such as adjusting the screwing of the spacing rod when inserting the spacing rod into the fixture, making it extremely easy and reliable. It is another object of the present invention to provide an apparatus for maintaining a spacing between concrete form plates, which can maintain the space between form plates at a predetermined length.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, according to the present invention, a fixture is attached to each of the facing form plates, a spacing rod is disposed between the two fixtures, and both ends of the spacing rod are provided. Are engaged with the corresponding fixtures by moving the spacing rods in a direction perpendicular to the axis, so that the spacing between the form plates is maintained at a predetermined length. A pair of half nuts having a screw portion of a predetermined length formed on at least one end of the spacing rod and having a screw portion to be screwed to the screw portion are housed in the fixing tool. While holding the fixture in the open state so as to receive the thread portion of the spacing rod, while moving the spacing rod in a direction perpendicular to the axis, the thread portion is closed while the pair of half nuts are closed. The spacing rod Screwed into parts, both are characterized by being configured to engage.

According to the present invention, the accommodation portion of the fixture main body in the fixture in which the spacing rod having the straight shaft type and having the thread portion of the predetermined length at at least one end is attached to each of the facing form plates. To be inserted from above. At this time, the pair of half nuts in the open state provided in the receiving section are pushed down by the ends of the spacing rods, thereby closing the pair of half nuts so as to sandwich the ends of the spacing rods.
Since the pair of half nuts is formed with a threaded portion that is screwed to correspond to the threaded portion of the spacing rod, when the pair of half nuts sandwich the spacing rod and close, the half retaining nut and the half By screwing both screw parts with the nut,
A spacing bar engages the fixture. At this time, screwing of both threaded portions can be performed at an arbitrary position in the axial direction. The two members can be engaged with each other only by pushing in further, and the interval between the concrete form plates can be set to a predetermined length very easily.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS.
This will be described in detail with reference to FIG.

As shown in FIG. 1, the apparatus for maintaining a spacing between concrete form plates according to the present invention is provided with a fixture 1 attached to each of the facing form plates 10, and is laterally engaged between the two fixtures. And a space holding rod 3 for holding the space between the form plates 10.

The spacing rod 3 is made of a straight shaft type round bar-shaped steel material, and has a thread portion 4 (see FIG. 5) having a predetermined length at both ends 5,5.

The fixture 1 includes a fixture body 16 for engaging the end 5 of the spacing rod 3, and a fixture body 16 formed of a mold plate 10.
And a body attachment 18 to be attached to the main body.

Next, the structure of the fixture main body 16 will be described in detail with reference to FIGS.

The fixture main body 16 is formed in a block shape formed by press-molding metal, and its top surface is opened in a substantially rectangular shape so that the end 5 of the spacing rod 3 can be inserted from above. In addition, a bottomed housing portion 2 for housing a pair of half nuts 17 for engaging the end portions 5 is formed in the inside thereof (the half nut 17 and the housing portion 2 will be described in detail later). ). Note that the fixture body 16 can be a resin molded product.

The front end face 7 of the fixture body 16 is formed to be vertically flat as shown in FIG. 2, and a slit-shaped insertion guide portion 9 extends vertically from the top surface at a middle position between the front end face 7 and the right and left sides. Have been. The insertion guide section 9 is formed to be narrower than the accommodation section 2 and slightly wider than the diameter of the spacing rod 3, so that when the end 5 of the spacing rod 3 is inserted from above the fixture body 16, the end section 5 is inserted. Are guided along the insertion guide 9 so as to maintain the intermediate position.

As shown in FIG. 3, the rear end face 6 of the fixture body 16 is formed so as to be vertical and flat, and has a shaft bolt 11 to be attached to the form plate 10. The shaft bolt 11 is in the form of a bolt with an overhanging collar 12, and has an annular recess 15 for breaking guide at the base. As shown in FIG. 7, the annular recess 15 is provided to accurately and easily break and remove the shaft bolt 11 from the application position of the annular recess 15 after the mold plate 10 is disassembled. It can be performed with high efficiency. The shaft bolt 11 is locked in a locking groove 13 vertically penetrating from the top surface at a left and right intermediate position of the rear end face 6 of the fixture body 16. The width is formed smaller than the diameter of the shaft bolt 11. Further, the shaft bolt 11 is provided so as to be sandwiched in advance by the locking groove 13 when the fixing body 16 is formed by press molding. Furthermore, shaft bolt 11
A cone 14 formed of a synthetic resin in a tapered shape is pivotally supported, and is provided so as to abut the form plate 10 on a wide surface 14 a of the cone 14. However, the shaft bolt 11 and the cone 14 are fixed to the fixture body 16.
May be integrally formed.

Next, the shape of the housing portion 2 formed inside the fixture body 16 together with the shape of the side surface 19 of the fixture body 16 will be described with reference to FIGS.

On the inner surface side of the side surface 19, a convex wall-shaped guide portion 24 is formed in the longitudinal direction slightly from the front end surface 7 to the rear end surface 6 side from the intermediate position between the rear end surface 6 and the front end surface 7 A nut locking portion 26 is protrudingly provided substantially at the center between the two. The shape of the side surface 19 above the nut locking portion 26 has a slope 20 that extends outward.
Further, a folded portion 23 is formed so as to be narrowed inward at the top surface above the folded portion. The shape of the side surface 19 below the nut engaging portion 26 is formed to be vertically flat.

As described above, the housing portion 2 has a bottomed shape in which the guide portion 24 and the nut locking portion 26 are provided on the side surface and the insertion guide portion 9 is provided on the front surface.

Since the fixture main body 16 is formed by press molding, the guide recess 24 formed in the vertical direction is provided at a position on the outer surface side of the guide portion 24 formed on the inner surface of the side surface 19.
4a are formed, and a concave nut locking concave portion 26a is formed at a position on the outer surface side of the nut locking portion 26. However, the guide concave portion 24a and the nut locking concave portion 26a do not have to be particularly formed.
With regard to 6, a metal block may be formed by welding, or a plate-shaped member may be provided.

A shaft end 5 of the spacing rod 3 is provided in the housing 2.
Is provided with a pair of half nuts 17 that can be opened and closed so that the space holding bar 3 can be moved up and down between the guide portion 24 in the housing portion 2 and the front end surface 7. It is arranged so that it cannot be moved in the axial direction. The pair of half nuts 17 are supported on the nut locking portion 26 in an open state. The shape of the pair of half nuts 17 is made up of a square rectangular nut as shown in FIG. 8A, cut in a symmetrical manner, and connected to each other by a thin portion 28. Further, a screw portion 27 corresponding to the screw portion 4 of the spacing rod 3 is provided on the inner peripheral surface of the half nut 17. As shown in FIG. 8 (a), the shape of the half nut 17 of the present embodiment used was a square rectangular nut.
The shape may be circular or hexagonal as shown in (b) or (c), and the shape need not be specified.

Next, the body fixture 18 (see FIG. 5) for fixing the fixture body 16 to the mold plate 10 has a cylindrical shape, and the inner peripheral surface thereof has the shape of the fixture body 16. It is formed so that the provided shaft bolt 11 can be screwed. However, the shape of the main body fixture 18 is different from that of the fixture body 16.
Is only required to be able to be fixed to the form plate 10, and there is no particular limitation.

Next, a description will be given of a method for maintaining the spacing of the spacing device for a concrete form plate having the above-described configuration according to the present embodiment with reference to FIGS.

After the reinforcing bars (not shown) are arranged in the concrete form plates 10 arranged at a predetermined interval, as shown in FIG. Is disposed on the inner surface side of the mold plate 10, the shaft bolt 11 is made to penetrate from the inside to the outside of the mold plate 10, and the main body fixture 18 is attached to the shaft bolt 11 protruding on the outer surface. At this time, the fixture 1 is similarly attached to the facing form plate 10. Next, as shown in FIGS. 5 and 6, the accommodation portion 2 of the fixture body 16 attached to each of the form plates 10 facing both end portions 5, 5 of the spacing rod 3 from above to below (arrows shown in the drawings). Y). The end portion 5 pushes down a pair of half nuts 17 provided in the housing portion 2 in an open state, and the half nuts 17 are attached to both side surfaces 19 in the housing portion 2.
Is closed so as to sandwich the end portion 5 of the spacing rod 3 along the slope 20 formed in the above. On the inner peripheral surfaces of the pair of half nuts 17, a screw portion 27 that is screwed in correspondence with the screw portion 4 provided on the spacing rod 3 is formed.
When the gap 7 is sandwiched and closed, the two threaded portions are screwed together, and the gap 3 is engaged with the fixture 1.

When the spacing rod 3 engages with the fixture 1 as described above, the pair of half nuts are moved between the guide portion 24 formed on both side surfaces 19 in the housing portion 2 and the front end surface 7. The half nut 17 that is not moved in the axial direction of the spacing rod 3 because of being guided by the nut and is further engaged with the spacing rod 3 and closed is a nut formed on both side faces 19 in the housing portion 2. Since the half nut 17 is locked by the locking portion 26 so as not to move up and down, the half nut 17 can maintain the state in which the spacing rod 3 is engaged.

The spacing device for concrete form plates of the present embodiment can be configured in various forms.

For example, a description will be given of a concrete form plate spacing maintaining device having a half nut 17 separated into two in a housing portion with reference to FIGS. 9 to 11. FIG. As shown in FIG. 11, the spacing rod 3 is the same as that described in the above embodiment, and the fixing tool main body 50 has a housing 52, a pair of separated half nuts 5.
3. The one provided with the nut locking portion 51 and the half nut holding shaft 54 was used. Further, a screw portion 55 corresponding to the screw portion 4 provided at the shaft end of the spacing rod 3 is provided on the inner peripheral surface of the half nut 53. The fixture main body 50 is provided with a space holding rod 3 sandwiched between the half nuts 53 in the accommodation portion 52.
A pair of left and right half nut holding shafts 54 are provided so that the half nuts 53 are separated from each other so that the half nuts 53 can be opened and closed. It is of a block body shape with an upper opening provided as follows. The half nut 53 is supported in an open state by a nut locking portion 51 as shown in FIGS. That is, when the spacing rod 3 is inserted into the fixture main body 50 at the arrow Z shown in the figure, the pair of half nuts 53 are closed so as to be pushed into the spacing rod 3, and the thread portion 4 of the spacing rod 3 and the half nut The screw portions 55 of the 53 are screwed together, and the closed half nut 53 is locked by the nut locking portion 51 so that both are engaged.

In the present embodiment, the fixture 1 having the half nut 17 is attached to each of the facing form plates 10,
Although the spacing between the form plates 10 is maintained at a predetermined length by the spacing holding bar 3, the fixing tool 1 is attached to one of the two fixing tools and the other fixing tool H is used, for example, as described in the related art. May be. In such a case, the shape of the spacing rod 3 is such that a screw portion 4 having a predetermined length is formed at one end and a large-diameter head B is provided at the other end to form a bolt head, that is, an ordinary bolt shape. Anything may be used. As a result, one end of the interval maintaining rod 3 on which the screw portion 4 having a predetermined length is formed is engaged with the half nut 17 of the fixture 1, and the other end of the bolt head is formed with the head locking portion (bolt head) of the fixture H. Part locking part) C
To lock.

Further, in the present embodiment, the screw portion 4 is screwed into the end portion 5 of the spacing rod 3, and the screw portion 27 corresponding to the screw portion 4 is formed on the inner peripheral surface of the half nut 17 provided in the fixture 1. Are screwed, and the two screw portions are screwed into each other to engage with each other. However, at the end 5 of the spacing rod 3, for example, an uneven engagement portion is formed, and For example, a pair of half-nut-shaped engaging members formed with a concave-convex engaging portion that arbitrarily engages with the engaging portion at a predetermined range of axial positions is accommodated, and the pair of engaging members is While holding the joint in an open state to receive the joint and in a state in which it cannot move in the axial direction, when the spacing rod 3 is moved in a direction perpendicular to the axis, the pair of engaging members close while The engaging portion is engaged with the engaged portion of the spacing rod 3 so that both the spacing rod 3 and the fixture 1 It may be configured such that case.

Further, the shape of the peripheral surface of the half nut 17 of the present embodiment is formed in a tapered shape so as to be narrowed toward the other axial end of the holding spacer 3 to be sandwiched.
By forming the shape of the inner surface of the fixture 1 for accommodating the taper 7 into an inclined surface corresponding to the half nut 17 formed in a tapered shape, when a tension force acts on the spacing rod 3,
The tapered shape of the half nut 17 and the inclined surface in the accommodating portion 2 may generate a wedge effect, and the pair of half nuts 17 may move in the closing direction.

[0031]

According to the present invention, the number of components is reduced, and the need for adjustment such as adjusting the screwing of the spacing rod when the spacing rod is inserted into the fixture is eliminated, and the mold is extremely easily and reliably formed. It is possible to provide a spacing device for a concrete form plate capable of maintaining a spacing between the boards at a predetermined length.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a spacing device for a concrete form plate according to an embodiment of the present invention.

FIG. 2 is a perspective view of the fixture body according to the embodiment of the present invention as viewed from the front.

FIG. 3 is a perspective view of the fixture main body according to the embodiment of the present invention as viewed from the rear.

FIG. 4 shows a fixture main body according to the embodiment of the present invention, and (a).
Is a front view, (b) is a plan view, and (c) is a side view.

FIG. 5 is a cross-sectional view showing a gap holding device when the gap holding bar is engaged with the fixture body after the fixture of the embodiment of the present invention is attached to the form plate.

FIG. 6 is a front view showing the fixture body when the spacing rod is engaged with the fixture body of the embodiment of the present invention, and FIG. 6A is a front view showing a state immediately before the spacing rod is inserted into the fixture body. ,
(B) is a front view showing a state in which both are engaged after inserting the spacing rod into the fixture body.

FIG. 7 is a cross-sectional view showing a mold disassembled state of the embodiment of the present invention.

FIGS. 8A and 8B are front views showing a case where the shape is a quadrangle, and FIG. 8B is a front view showing a case where the shape is a circle in the half nut provided in the fixture body according to the embodiment of the present invention; FIG. 3C is a front view showing a case where the shape is a hexagon.

FIG. 9 is a partially cutaway perspective view showing a spacing device for a concrete form plate according to another embodiment of the present invention.

FIG. 10 is a cross-sectional view showing a spacing device for a concrete form plate according to another embodiment of the present invention.

FIG. 11 is a top view of a spacing device for a concrete form plate according to another embodiment of the present invention, in which an engaging portion is viewed from a side.

FIG. 12 is a cross-sectional view showing a conventional spacing device for a concrete form plate.

FIGS. 13A and 13B show a conventional fixture main body, wherein FIG. 13A is a front view, FIG. 13B is a plan view, and FIG. 13C is a side view.

FIG. 14 is a cross-sectional view showing a gap holding device when a gap holding rod is engaged with a fixture body after a conventional fixture is attached to a mold plate.

FIG. 15 is a perspective view of a conventional fixture body viewed from the front.

FIG. 16 is a perspective view of a conventional fixture body viewed from the rear.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixing tool 3 Spacing holding rod 4 Screw part 5 End part 10 Form plate 17 Half nut 19 Side surface 27 Screw part 28 Thin part

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) E04G 17/065 F16B 37/08-37/10

Claims (6)

(57) [Claims] 1. A fixture is attached to each of the facing form plates, a spacing rod is arranged between the two fixtures, and both ends of the spacing rod are attached to the corresponding fixtures, respectively. In the spacing device for a concrete form plate that is engaged by being moved in a direction perpendicular to the axis to maintain the space between the form plates at a predetermined length, at least one end of the spacing rod has a predetermined length. A pair of half nuts having screw portions formed therein and having screw portions screwed to the screw portions are housed in the fixture, and the pair of half nuts are opened so as to receive the screw portions of the spacing rod. On the other hand, when the space holding bar is moved in a direction perpendicular to the axis, the screw portion is screwed into the screw portion of the space holding bar while closing the pair of half nuts. Are configured to engage A spacing device for concrete formwork, characterized in that: 2. A fixed length screw portion is formed at both ends of the spacing rod, and a pair of half nuts each having a screw portion corresponding to the screw portion are accommodated in each of the fixtures. 2. The apparatus according to claim 1, wherein the gap is maintained. 3. A thread portion having a predetermined length is formed at one end of the spacing rod, and a bolt head is formed at the other end, and one of the two fixing tools corresponds to the thread portion of the spacing rod. 2. A concrete formwork plate according to claim 1, wherein a pair of half nuts provided with screw portions to be accommodated are accommodated, and a bolt head engaging portion corresponding to the bolt head is formed in the other fixing tool. Spacing device. 4. The apparatus according to claim 1, wherein a pair of half nuts are connected by thin portions. 5. A half in which a half nut is tapered so that a peripheral surface of the half nut becomes narrower toward the other end in the axial direction of the spacing rod, and an inner surface of a half nut receiving portion of the fixing tool is formed in a tapered shape. 5. A pair of half nuts, which are formed on an inclined surface corresponding to the nut and move in a direction to sandwich the spacing rod when a tensile force acts on the spacing rod. A spacing device for a concrete formwork plate according to the present invention. 6. A fixture is attached to each of the facing form plates, a spacing rod is arranged between the two fixtures, and both ends of the spacing rod are attached to the corresponding fixtures, respectively. In a concrete form plate spacing device for holding the gap between the form plates at a predetermined length by moving the spacer in a direction perpendicular to the axis, the engaging member is engaged with at least one end of the spacing rod. And a pair of half nut-shaped engaging tools, each of which has an engaging portion that is arbitrarily engaged with the engaged portion at a predetermined range of axial positions with respect to the engaged portion. While the engaging tool is held by the fixing tool in an open state so as to receive the engaged portion, when the spacing rod is moved in a direction perpendicular to the axis, the engaging tool is closed while the pair of engaging tools are closed. The mating portion engages with the engaged portion of the spacing rod, and the two engage. A spacing device for a concrete formwork, characterized in that the spacing is maintained.