JP4955120B1 - Formwork disassembly aid - Google Patents

Abstract

Disclosed is a formwork disassembly assisting tool that can be easily peeled off from concrete and can be easily manufactured and can be manufactured at a low cost.
A hollow portion 11a into which a shaft portion protruding from a cone is inserted is connected to the donut-shaped ring plate 11 and the ring plate 11 stored in the cone in plan view. A wire 17 that is led out from the shaft hole for the shaft portion that is drilled, and at the time of disassembling the formwork, pulls the wire 17 to pull the formwork from the concrete via the ring plate 11 to assist in disassembling the formwork The wire 10 is sequentially inserted in the circumferential direction through 2 (N + 1) insertion holes 14 a to 14 d provided at intervals in the circumferential direction of the ring plate 11. By forming the seam portions 19 a to 19 c of the wire 17, the intermediate portion of the wire 17 and the ring plate 11 are connected, and both end portions of the wire 17 are coupled via the sleeve 18.
[Selection] Figure 2

Description

The present invention relates to a formwork disassembly assisting tool used at the time of formwork dismantling after placing concrete.

Reinforced concrete frames are generally used in rebar construction for rebar assembly (bar arrangement), formwork for building a formwork around the rebar, and space defined by the built formwork. It is constructed according to the procedures of concrete placement work for pouring ready-mixed concrete and formwork dismantling work for removing the formwork from the hardened concrete surface. In particular, the formwork dismantling work involves removing the formwork from the concrete by inserting a bar between concrete and the formwork, so the veneer and the concrete surface that make up the formwork are damaged along with the dismantling work. In addition to cases, there are many dangers in the work of dismantling the formwork in a narrow or high place because the feet become unstable.

Therefore, in Patent Document 1, an annular member having a shape in which a donut is crushed, which is used by being sandwiched between a positioning member (cone) inserted through a shaft portion (separator) and a formwork with which the positioning member abuts, The male screw exposed from the end of the positioning member is inserted into a hole provided in the mold surface, and is used to be exposed with the male screw to the outside of the mold frame. An invention of a bearded ring member comprising a beard portion constituted by a wire wound around the ring member via two groove portions provided at positions to be disclosed is disclosed.
In this invention, by forming the ring by connecting the tips of the mustache portions extending outward from the hole provided in the mold, and inserting the burl into the ring to pull the mustache portion, The mold is peeled off through the ring member. Therefore, the formwork can be easily removed, and the veneer and the concrete surface are not damaged.

Further, in Patent Document 2, in a peeling ring plate housed in an annular recess between an inner surface of a separator cup or P cone and a mold shaft, both ends of a U-shaped U-shaped wire are used for peeling. With the U-shaped wire connected to the ring plate, the U-shaped wire is led to the outside from the mold shaft insertion hole of the mold, and when peeling the mold, the U-shaped wire is pulled from the outside of the mold to A peeling ring plate having a structure in which a formwork is peeled off from concrete via a ring plate is disclosed.

Japanese Patent No. 3918016 Utility Model Registration No. 3142154

However, in the beaded annular member of Patent Document 1, the wire is wound around the annular member so as to avoid the central portion of the hollow portion of the annular member, and therefore the annular member is unstable when the wire is pulled. Therefore, the entire surface of the annular member does not contact the mold surface evenly. For this reason, it is difficult to peel off the formwork smoothly, and the tensile force concentrates on the part where the annular member is offset. Therefore, there is a problem that a large tensile force is required and the wire is easily cut.

On the other hand, in the peeling ring plate of Patent Document 2, since the tensile force acting on the U-shaped wire acts on the central axis of the peeling ring plate, the above problem does not occur. Since it has to be welded to the peeling ring plate, there is a problem in that it takes time to manufacture and the manufacturing unit price increases.

The present invention has been made in view of such circumstances, and provides a formwork disassembly assisting tool that can be easily peeled off from concrete and can be easily manufactured and kept at a low unit price. With the goal.

In order to achieve the above object, the present invention has a hollow portion into which a shaft portion protruding from a cone used for formwork is inserted, and is connected to the ring plate accommodated in the cone and the ring plate. And a wire rod led out from the shaft hole for the shaft portion drilled in the mold, and when the mold is disassembled, the wire is pulled from the concrete through the ring plate by pulling the wire. A tool for dismantling formwork,
On the ring plate, one wire is sequentially inserted in the circumferential direction through 2 (N + 1) (N is a natural number of 1 or more) insertion holes provided at intervals in the circumferential direction of the ring plate. The seam portion of the wire is formed to connect the intermediate portion of the wire and the ring plate, and both ends of the wire are coupled via sleeves extrapolated to the both ends ,
The insertion hole into which the wire is inserted first and the insertion hole into which the wire is inserted last are on a straight line passing through the center of the ring plate and at a position equidistant from the center across the hollow portion. It is said.

In the formwork disassembly assisting tool according to the present invention, one wire rod is sequentially inserted in the circumferential direction through 2 (N + 1) insertion holes provided at intervals in the circumferential direction of the ring plate, and the wire rod is placed on the ring plate. The intermediate portion of the wire is connected to the ring plate by forming a seam portion. Moreover, the both ends of a wire are couple | bonded by the sleeve extrapolated to this both ends. By doing in this way, it is not only necessary to use welding or the like for joining the members, but it is possible to easily manufacture the formwork disassembly assisting tool without taking time to manufacture the formwork disassembly assisting tool. As a result, it is possible to keep the manufacturing unit price of the formwork disassembly assisting tool low.

In order to prevent the tensile force from acting eccentrically on the formwork disassembly assisting tool when pulling both ends of the wire during the formwork disassembly, 2 (N + 1) insertion holes pass through the center of the ring plate and the ring plate. center desirable Rukoto arranged symmetrically about an imaginary line bisecting an insertion hole which the wire is inserted into the insertion hole and the last to be inserted first is on a straight line passing through the center of the ring plate, and across the hollow portion from Ru position near equidistant.
The number of insertion holes may be an even number of 4 or more, and there is no theoretical maximum value, but it is considered that the practical maximum value is about 10 from the relationship with the wire diameter.

In the formwork disassembly aid according to the present invention, at least a part of the insertion hole may be a long hole that is longer in the circumferential direction than the radial direction of the ring plate, thereby It can be easily inserted through the insertion hole.

Further, in the formwork disassembly aid according to the present invention, the sleeve into which both ends of the wire are inserted is pressurized from the outside, and the axial section of the both ends of the wire and the axial section of the sleeve are wavy. May be.
In this configuration, since the axial cross section at both ends of the wire rod and the axial cross section of the sleeve are wave-like, the wire rod does not come out of the sleeve even when a large tensile force is applied to the wire rod during disassembly of the formwork.

A formwork disassembly aid according to the present invention includes a ring plate housed in a cone, and a wire rod connected to the ring plate and led out from a shaft hole formed in the mold frame, and pulls the wire rod. Thereby, a formwork can be easily peeled off from concrete via a ring board.

In particular, in the formwork disassembly aid according to the present invention, a single wire rod is sequentially inserted through a plurality of insertion holes provided at intervals in the circumferential direction of the ring plate, and a seam portion of the wire rod is formed on the ring plate. As a result, the intermediate portion of the wire rod is connected to the ring plate, and both ends of the wire rod are connected via the sleeve, so that it becomes easy to manufacture the mold disassembly aid and manufacture of the mold disassembly aid Unit price can be kept low.

It is a schematic diagram for demonstrating the usage method of the formwork disassembly assistance tool which concerns on one embodiment of this invention. It is a perspective view of the same type frame disassembly assistance tool. It is a disassembled perspective view of the same type frame disassembly assistance tool. FIG. 3 is an axial sectional view of a sleeve that has been pressure-deformed so that the axial section is wavy. It is a top view of a ring board. It is a top view of the ring board which has the insertion hole which consists of a long hole. (A) is a plan view of a ring plate in which six insertion holes are formed, and (B) is a plan view of the ring plate in which a wire is set in the insertion hole.

Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention. In the present specification, it is assumed that the side on which the cone is installed with the mold interposed therebetween, that is, the side into which the ready-mixed concrete is poured is the “inside” side, and the opposite side is the “outside” side. For the ring plate, for convenience, the surface that abuts the mold is referred to as the “front” surface, and the opposite surface is referred to as the “back” surface.

In the form work prior to placing concrete, as shown in FIG. 1, a separator 22 made of a metal rod is used as a member for maintaining a distance between opposing form forms 24 (only one is shown). Screw portions are formed at both ends of the separator 22, and a synthetic resin or metal cone 21 is attached. The cone 21 has a truncated cone shape, and a concave portion 21a that is reduced in diameter toward the small diameter portion side is formed on the large diameter portion side that contacts the mold 24, and a shaft portion that protrudes from the cone 21 is formed in the center portion thereof. 23 is attached. The shaft portion 23 is inserted into a shaft hole 24a formed in the mold 24, and a mold fastening bolt 25 having a female screw portion formed at one end is attached to the male screw portion protruding outward from the mold 24. Is done.

The formwork disassembly assisting tool 10 according to an embodiment of the present invention has a) a hollow portion 11a into which a shaft portion 23 protruding from a cone 21 is inserted, and is stored in the recessed portion 21a of the cone 21 in plan view. A donut-shaped ring plate 11, b) a wire 17 (an example of a wire rod) connected to the ring plate 11 and led to the outside from a shaft hole 24 a drilled in the mold 24, and c) the wire 17 It is schematically configured from a sleeve 18 that joins end portions (see FIGS. 2 and 3).

The ring plate 11 is made of a stainless steel plate, and has an outer diameter of 20φ, an inner diameter of 12φ, and a thickness of about 1 mm. As shown in FIG. 5, the ring plate 11 has a plurality of 1.5 φ low insertion holes 14 a to 14 d through which the wire 17 is inserted at intervals in the circumferential direction of the ring plate 11 (an even number of four or more). In the present embodiment, four are provided). Specifically, insertion holes 14a and 14d are provided on a straight line passing through the center of the ring plate 11 and at equal distances from the center across the hollow portion 11a, and two vertical lines connecting the insertion holes 14a and 14d. Insertion holes 14b and 14c are provided at positions symmetrical about the bisector. That is, the four insertion holes 14a to 14d are arranged on the semicircular arc in the order of the insertion hole 14a, the insertion hole 14b, the insertion hole 14c, and the insertion hole 14d. Since each insertion hole 14a-14d is arrange | positioned on the semicircular arc, the intermediate part 17a of the wire 17 does not pass the hollow part 11a of the ring board 11. FIG.

As shown in FIGS. 2 and 3, in the mold disassembly aid 10, a single wire 17 sequentially inserts the insertion holes 14 a to 14 d in the circumferential direction of the ring plate 11, thereby forming a seam portion formed of the wires 17. 19 a to 19 c are formed on the ring plate 11. That is, a seam portion 19a is formed between the insertion holes 14a and 14b on the back surface side of the ring plate 11, and a seam portion 19c is formed between the insertion holes 14c and 14d, and a seam is formed between the insertion holes 14b and 14c on the surface side of the ring plate 11. A portion 19b is formed. And the intermediate part 17a of the wire 17 and the ring board 11 are connected by forming these seam parts 19a-19c. When both ends of the wire 17 are pulled, the seam portion 19b formed on the surface side of the ring plate 11 comes into contact with the ring plate 11 to resist the tensile force.

For the wire 17, a stainless wire having a diameter of about 1.2 mm and a length of about 300 mm can be used. Moreover, the cross section of the wire 17 can have any shape, and can be circular, square, rectangular, or the like.

The sleeve 18 is made of aluminum, stainless steel, or steel, and is a sleeve having no wrinkles such as a cylindrical sleeve or an oval sleeve (see FIG. 3). The sleeve 18 is extrapolated to both ends of the wire 17 and the side surface of the sleeve 18 is compressed in the radial direction until the axial cross section of the sleeve 18 becomes flat. In addition, as shown in FIG. 4, you may carry out a pressure deformation so that the axial direction cross section of the both ends of the wire 17 and the axial direction cross section of the sleeve 18 may become wavy.

The assembly procedure of the formwork disassembly assisting tool 10 is as follows.
(1) A ring plate 11, a wire 17 and a sleeve 18 formed in a predetermined shape are prepared.
(2) After inserting one end of the wire 17 into the insertion hole 14 a formed in the ring plate 11, insert one end of the wire 17 along the circumferential direction of the ring plate 11 into the insertion hole 14 b and the insertion hole 14 c. The insertion holes 14d are inserted in this order (see FIG. 3). That is, when the wire 17 is inserted into the insertion hole 14a, one surface of the wire 17 is moved from the front surface to the back surface of the ring plate 11, and when the wire 17 is inserted into the insertion hole 14b, from the back surface to the surface of the ring plate 11. End portions are inserted into the insertion holes 14 a to 14 d alternately with respect to the ring plate 11.
(3) When the wire 17 is inserted into all the insertion holes 14a to 14d, the wire 17 protruding from the insertion hole 14d to the front side of the ring plate 11 so that the intermediate part 17a of the wire 17 becomes the seam parts 19a to 19c. Is pulled out (see FIG. 3). The looseness of the seam portions 19a to 19c is eliminated, and the intermediate portion 17a of the wire 17 and the ring plate 11 are connected by forming the seam portions 19a to 19c (see FIG. 2).
(4) The sleeve 18 is extrapolated to both ends of the wire 17 to compress and compress the side surface of the sleeve 18 (see FIGS. 2 and 3).

When the formwork disassembly aid 10 is used, the shaft portion 23 of the cone 21 is inserted into the hollow portion 11a of the ring plate 11, and the ring plate 11 is accommodated (inserted) into the recessed portion 21a of the cone 21 (see FIG. 1). ). At that time, the surface of the ring plate 11 must face the mold 24. Then, the wire 17 having both ends joined by the sleeve 18 is led out from the shaft hole 24a for the shaft portion 23 formed in the mold 24, and the mold is formed on the shaft portion 23 protruding outside from the mold 24. A frame fastening bracket 25 is attached.
At the time of dismantling the mold, after removing the mold fastening metal fitting 25 from the shaft portion 23, the bar 17 is inserted into the ring formed by the wire 17 and the sleeve 18 exposed from the mold 24, and the wire 17 is pulled. The mold 24 can be peeled off from the concrete via the ring plate 11.

FIG. 6 shows a modification of the ring plate. In this modification, an insertion hole provided on a semicircular arc having both ends of insertion holes 15a and 15d provided on a straight line passing through the center of the ring plate 12 and equidistant from the center across the hollow portion 12a. The shapes of 15 b and 15 c are different from the insertion holes 14 b and 14 c provided in the ring plate 11. That is, in the ring plate 12, the insertion holes 15 b and 15 c are not perfect circles, but are long holes that are longer in the circumferential direction than the radial direction of the ring plate 12.

FIGS. 7A and 7B show another modification of the ring plate. In the ring plate 13, the number of insertion holes 16a to 16f is six. Specifically, on the straight line passing through the center of the ring plate 13 and on the semicircular arc having the insertion holes 16a and 16f provided at equal distances from the center across the hollow portion 13a, with the insertion holes 16a and 16f at both ends. In addition, through holes 16b, 16c, 16d, and 16e are provided at symmetrical positions with respect to a vertical bisector connecting the through holes 16a and 16f. That is, the six insertion holes 16a to 16f are arranged on the semicircular arc in the order of the insertion hole 16a, the insertion hole 16b, the insertion hole 16c, the insertion hole 16d, the insertion hole 16e, and the insertion hole 16f.

When one wire 17 is sequentially inserted through the through holes 16a to 16f in the circumferential direction of the ring plate 13, between the through holes 16a and 16b on the back surface side of the ring plate 13, between the seam portion 20a and the through holes 16c and 16d. A stitch portion 20e is formed between the stitch portion 20c and the insertion holes 16e, 16f, and a stitch portion 20b is formed between the insertion holes 16b, 16c on the surface side of the ring plate 13, and a stitch portion 20d is formed between the insertion holes 16d, 16e. Has been. When both ends of the wire 17 are pulled, the seams 20b and 20d formed on the surface side of the ring plate 13 come into contact with the ring plate 13 to resist the tensile force.

Although the embodiments of the present invention have been described above, the present invention is not limited to the configurations described in the above-described embodiments, and is considered within the scope of the matters described in the claims. Other embodiments and modifications are also included. For example, in the above embodiment, one wire is inserted through all the insertion holes provided in the ring plate, but there may be an insertion hole through which no wire is inserted. That is, the number of insertion holes through which one wire passes is only 2 (N + 1) (N is a natural number of 1 or more).

Moreover, in the said embodiment, although the single wire was used as a wire, the wire rope which consists of a strand wire, a wire, etc. can also be used as a wire. Needless to say, the shape of the cone is not limited to a truncated cone shape, and may be other shapes such as a bowl shape.

10: Formwork disassembly assistance tool 11, 12, 13: Ring plate, 11a, 12a, 13a: Hollow portion, 14a-14d, 15a-15d, 16a-16f: Insertion hole, 17: Wire (wire), 17a: Intermediate part, 18: Sleeve, 19a to 19c, 20a to 20e: Seam part, 21: Cone, 21a: Recessed part, 22: Separator, 23: Shaft part, 24: Mold frame, 24a: Shaft hole, 25: Mold frame Fastening bracket

Claims (3)

A shaft part protruding from a cone used for formwork construction has a hollow part to be inserted, a ring plate housed in the cone, and the shaft connected to the ring plate and drilled in the formwork A wire rod led to the outside from the shaft hole for the part, and at the time of disassembling the mold, a mold disassembly aid that pulls the wire from the concrete through the ring plate by pulling the wire,
On the ring plate, one wire is sequentially inserted in the circumferential direction through 2 (N + 1) (N is a natural number of 1 or more) insertion holes provided at intervals in the circumferential direction of the ring plate. The seam portion of the wire is formed to connect the intermediate portion of the wire and the ring plate, and both ends of the wire are coupled via sleeves extrapolated to the both ends ,
The insertion hole into which the wire is inserted first and the insertion hole into which the wire is inserted last are on a straight line passing through the center of the ring plate and at a position equidistant from the center across the hollow portion. Formwork disassembly aids. The formwork disassembly aid according to claim 1, wherein at least a part of the insertion holes are elongated holes in the circumferential direction as compared to the radial direction of the ring plate. . The formwork disassembly assisting tool according to claim 1 or 2, wherein the sleeve into which both ends of the wire are inserted is pressurized from the outside, and an axial section of the both ends of the wire and an axial section of the sleeve are wavy. Formwork dismantling aid characterized by being said.

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