JP4026685B2 - Dismantling method of fixture and slab formwork - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fixture and a method for disassembling a slab formwork.
[0002]
[Prior art]
A hollow material fixture in a conventional hollow slab is disclosed in, for example, Japanese Patent Application Laid-Open No. 2000-160511. As shown in FIG. 2, a hollow slab tube P installed on the cradle 1 is fixed to the mold A with a fastening member 9 and a bolt 8.
[0003]
[Patent Document 1]
Japanese Unexamined Patent Publication No. 2000-160511 (FIG. 2)
[0004]
[Problems to be solved by the invention]
However, the above fixture has the following problems.
(1) Fixing tool and spacer are separated (2) To attach the fixing tool to the formwork, work from the upper and lower sides of the slab formwork is required (3) For dismantling the slab formwork Had to remove the bolt from the bottom side.
The present invention has been made in view of the above problems, and an object of the present invention is to provide a fixture and a method for disassembling a slab form that can easily disassemble the slab form.
[0006]
[Means for Solving the Problems]
The gist of the fixing device of the present invention for achieving the above-mentioned problems is composed of a lower spacer having a mounting pin protruding from the lower surface, and an upper spacer detachably attached to the lower spacer, and the mounting pin The halved pieces divided in the length direction are laterally displaced from each other and are closely contacted with the stepped portion, and a hook is formed with an appropriate gap portion between the upper and lower portions of the halved piece. The half piece has a structure in which a folding groove is formed.
The method for disassembling the slab form is to insert the mounting pin into the insertion hole in the bottom plate of the slab form to install the fixture of claim 1, and after binding the upper spacer of the fixture and the slab upper end muscle, After placing the concrete in the slab formwork and hardening the concrete, release the stepped state at the stepped portion of the halves of the mounting pin, and stack the halves so that the halves are united Then, the bottom plate is removed by removing the mounting pin from the insertion hole, and the mounting pin protruding from the concrete from which the bottom plate has been removed is broken off from the folding groove.
[0007]
Since the fixture that prevents the hollow material from being lifted by placing concrete into the slab formwork and the spacer for bar arrangement can be used together, construction can be omitted and the material cost can be reduced. Since the upper spacer can be removed from the lower spacer, its height can be freely changed. Various slab thicknesses can be accommodated simply by changing the height of the upper spacer. Since the halves of the mounting pins can be easily broken by the breaking groove, the slab form can be easily disassembled. The slab formwork can be easily disassembled by breaking the hook from the break groove just above the hook. Also, the slab form can be easily disassembled by breaking the mounting pin from the breakage groove at the base of the half piece. Also, the slab formwork can be easily disassembled by twisting the mounting pin from the narrowed base.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a fixing device and a method for disassembling a slab form according to the present invention will be described based on the drawings. First, the fixture will be described, and then the method for disassembling the slab formwork will be described. In the embodiments, the same components are described with the same reference numerals, and only different components are described with different reference numerals.
[0009]
FIG. 1 shows a fixing device 1 according to the first embodiment, that is, a fixing device used when fixing a hollow material of a hollow slab, and is composed of a lower spacer 2 and an upper spacer 3. The lower spacer 2 is formed in a plane H shape in which a plate body 4 is joined by a connecting plate 5 with plastic, and a mounting pin 6 is integrally formed on the connecting plate 5.
[0010]
As shown in FIG. 2, the mounting pin 6 is formed by halving half pieces 7 that are divided in the length direction and shifted in the lateral direction. A gap 8 is appropriately provided above and below the half pieces 7. Thus, the hook 9 is formed, and the hook 9 is gradually formed to have a smaller diameter toward both ends. In addition, the half piece 7 in the vicinity of the upper hook 9 is formed with a breaking groove 10 that can be easily broken. Further, the lower side of the half piece 7 is intimately contacted by the step joint portion 11 so that it cannot slide in the direction in which the half pieces 7 are united. It has become.
[0011]
The upper spacer 3 is provided with a slab upper end muscle, and is formed by binding steel wires of appropriate lengths constituting the four legs 12 at the upper part. 12a is formed.
[0012]
FIG. 3 is a perspective view showing the fixture 13 according to the second embodiment, in which a lower spacer 14 and an upper spacer 15 are connected via connecting tools 16 and 17. The lower spacer 14 is provided with a mounting pin 6 having the same structure as described above, and the upper spacer 15 is formed with a recess 18 for placing the upper end of the slab. Since the lower spacer 14, the upper spacer 15, and the couplers 16 and 17 are made of plastic and can be separated from each other, their heights can be freely changed.
[0013]
FIG. 4 shows a cross-sectional view in which the hollow material is fixed using the fixing tool 1 described above. The mounting pin 6 is inserted into the insertion hole 20 opened in the slab form frame 19, and the hook 9 of the mounting pin 6 The fixture 1 is fixed. The lower spacer 2 of the fixture 1 is provided with a slab lower end stripe 21 to secure this cover thickness. A hollow member 22 is installed on the slab lower bar 21, and a slab upper bar 23 arranged on the hollow member 22 is supported by the upper spacer 3 and bound by a binding wire 24. Thus, the fixture 1 secures the hollow member 22 and also secures a space between the lower slab lower bar 21 and the upper slab upper bar 23 with the lower spacer 2 and the upper spacer 3.
[0014]
Next, a method for disassembling the slab formwork of the first embodiment using this fixture 1 will be described. In this method, the lower spacer 2 and the upper spacer 3 of the fixture 1 are used separately. First, as shown in FIG. 5, the insertion hole 20 is opened in the template of the slab mold 19, and the attachment pin 6 is inserted into the slab mold 19 from above to attach the lower spacer 2.
[0015]
As shown in FIG. 6, the method of inserting the mounting pin 6 releases the stepped state at the stepped portion 11 of the half piece 7 so that the half pieces 7 can be slid together. . Then, when the mounting pin 6 is inserted into the insertion hole 20 in this state, as shown in FIG. 7, the half piece 7 slides in the direction in which it is united, and the maximum diameter portion of the hook 9 overlaps to form the insertion hole. It becomes smaller than the inner diameter of 20.
[0016]
When the hook 9 passes through the insertion hole 20, as shown in FIG. 8, the half piece 7 returns to the original position, and the lower spacer 2 is fixed by the hook 9. Further, since the half pieces 7 are brought into close contact with each other at the step connecting portion 11, the mounting pin 6 is prevented from coming out of the insertion hole 20 due to vibration of the slab mold 19 or the like.
[0017]
Next, a slab lower end bar 21 is arranged on the lower spacer 2, and a hollow material unit 25 in which a spherical hollow member 22 is joined by a connecting bar 26 is installed on the slab lower end bar 21. Then, the slab upper end reinforcement 23 is arranged on the hollow material 22, and the slab upper end reinforcement 23 is supported by the upper spacer 3 attached to the lower spacer 2 and bound by the binding wire 24. Thus, while fixing the hollow material 22 to the slab formwork 19, a predetermined space is secured and the slab upper end reinforcement 23 and the slab lower end reinforcement 21 are arranged. Therefore, even if the concrete 27 is placed in the slab mold 19, the hollow material 22 fixed by the fixture 1 does not rise.
[0018]
Next, as shown in FIG. 9, after the concrete 27 is cured, the stepped state in the stepped portion 11 of the half piece 7 of the mounting pin 6 is released, and the half pieces 7 are integrated with each other. When the maximum diameter portion of the hook 9 is overlapped, the mounting pin 6 becomes smaller than the inner diameter of the insertion hole 20, so that the bottom plate is removed by removing the mounting pin 6 from the insertion hole 20. The slab formwork 19 is dismantled. Then, by disassembling the slab form 19 by removing the bottom plate, the mounting pin 6 protrudes from the concrete 27 and is struck with a hammer or the like to be broken from the break groove 10.
[0019]
11 and 12 show a method for disassembling the slab form according to the second embodiment. As shown in FIG. 11, the lower side of the half piece 7 divided in the length direction is shown below. The slab of the first embodiment except that a mounting pin 28 having a hook 9 that gradually becomes thinner toward the top and having a breaking groove 10 at the top of the hook 9 and at the base of the half piece is used. It is the same as the method of dismantling the formwork.
[0020]
As shown in FIG. 12, the disassembly method of the slab formwork is as follows. After the concrete 27 of the slab formwork 19 is hardened, the hook 9 is broken off by the take-up groove 10 immediately above the hook, and the slab form is removed. After the mold 19 is disassembled, the half piece 7 is broken by the root break groove 10. By folding the half piece 7 in this way, the bottom plate can be easily removed, so that the slab form 19 can be easily disassembled.
[0021]
FIGS. 13 and 14 show the method of disassembling the slab form according to the third embodiment, and as shown in FIG. The method is the same as the method for disassembling the slab form of the second embodiment, except that a mounting pin 29 provided with a hook 9 and having a breaking groove 10 at the base is used.
[0022]
As shown in FIG. 14, after the concrete 27 of the slab form 19 is hardened, the slab form is disassembled by breaking the half piece 7 with the break groove 10 at the base and then removing the bottom plate to remove the slab form. The mold 19 is disassembled. By folding the half piece 7 in this way, the bottom plate can be easily removed, so that the slab form 19 can be easily disassembled.
[0023]
FIG. 15 shows a method for disassembling the slab form according to the fourth embodiment. As shown in FIG. 15, hooks 9 that gradually become thinner toward the lower side are provided below the half pieces 7. The method is the same as the method for disassembling the slab form of the second embodiment, except that the mounting pin 30 provided with a thin base is used.
[0024]
In the dismantling method of the slab mold, as described above, after the concrete 27 of the slab mold 19 is hardened, the slab mold 19 is disassembled by twisting the half piece 7 from the thin base. By twisting the half piece 7 in this way, the bottom plate can be easily removed, so that the slab form 19 can be easily disassembled.
[0025]
【The invention's effect】
Since the fixture that prevents the hollow material from lifting when concrete is placed in the slab formwork and the spacer for bar arrangement can be combined, the construction can be omitted and the material cost can be reduced. .
[0026]
Since the upper spacer can be removed from the lower spacer, its height can be freely changed.
[0027]
Various slab thicknesses can be accommodated simply by changing the height of the upper spacer.
[0028]
Since the halves of the mounting pins can be easily broken, the slab formwork can be easily disassembled.
[0029]
The slab formwork can be disassembled simply by removing the hook of the mounting pin of the lower spacer from the hole.
[0030]
Since the mounting pin can be easily broken from the hook groove or at the base, the slab form can be easily disassembled.
[0031]
The slab formwork can be easily disassembled because it can be easily broken from the base where the mounting pin is thin.
[Brief description of the drawings]
FIG. 1 is a perspective view of a fixture according to a first embodiment.
2A is a front view of a mounting pin, FIG. 2B is a cross-sectional view taken along the line AA of FIG. 1, FIG. 2B is a cross-sectional view taken along the line BB, and FIG. Sectional drawing, (5) is the DD sectional view taken on the line, (6) is a perspective view of the mounting pin.
FIG. 3 is a perspective view of a fixture according to a second embodiment.
FIG. 4 is a cross-sectional view in which a hollow material is fixed with a fixing tool.
FIG. 5 is a cross-sectional view of a lower spacer attached to a slab formwork.
6A is a cross-sectional view before the mounting pin is inserted into the insertion hole, and FIG. 6B is a cross-sectional view taken along line EE of FIG.
7A is a cross-sectional view of the mounting pin being inserted into the insertion hole, and FIG. 7B is a cross-sectional view taken along line FF of FIG.
8A is a cross-sectional view in which an attachment pin is inserted into an insertion hole, and FIG. 8B is a cross-sectional view taken along the line GG in FIG.
FIG. 9 is a cross-sectional view of a method for attaching a hollow material with a fixture.
FIG. 10 is a cross-sectional view of the mounting pin broken away.
11A is a cross-sectional view of a mounting pin, and FIG. 11B is a cross-sectional view taken along line HH of FIG.
FIGS. 12A to 12D are cross-sectional views showing a method for disassembling a mold in the method for fixing a hollow material according to a second embodiment.
FIG. 13 is a cross-sectional view of a mounting pin.
FIGS. 14 (1) to (3) are cross-sectional views showing a method for disassembling a mold in a method for fixing a hollow material according to a third embodiment.
FIG. 15 is a cross-sectional view of a mounting pin used for a hollow material fixing method according to a fourth embodiment.
[Explanation of symbols]
1, 13, 29 Fixing tool 2, 14 Lower spacer 3, 15 Upper spacer 4 Plate body 5 Connecting plate 6, 28, 29 Mounting pin 7, Half piece 8 Gap 9 Hook 10 Breaking groove 11 Step joint 12 Leg 12a Bending parts 16, 17 Connecting tool 18 Recesses 19, 34 Slab frame 20 Insert hole 21 Slab lower bar 22, 31 Hollow material 23 Slab upper bar 24 Binding wire 25 Hollow material unit 26 Connecting bar 27 Concrete

Claims (2)

  It consists of a lower spacer with a mounting pin projecting on its lower surface and an upper spacer that is detachably attached to the lower spacer. And a hook is formed with an appropriate gap between the upper and lower portions of the half piece, and a break-off groove is formed in the half piece near the upper hook. Fixture.   The fixing pin of claim 1 is installed by inserting a mounting pin into the insertion hole in the bottom plate of the slab formwork, and after binding the upper spacer of the fixing tool and the upper end of the slab, the concrete is cast into the slab formwork. After the concrete has hardened, release the stepped state at the stepped joints of the halves of the mounting pin, overlap the halves so that they are united, and then insert the mounting pin A method for disassembling a slab form, wherein the bottom plate is removed so as to be pulled out from the hole, and the mounting pin protruding from the concrete from which the bottom plate has been removed is broken off from the break-off groove.

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