JP4828661B1 - 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 12 into which a shaft portion protruding from a cone is inserted is inserted into a ring-shaped ring plate 11 accommodated in the cone in plan view, and connected to the ring plate 11 to form a mold. A wire 15 that is led out from the shaft hole for the drilled shaft portion, and at the time of disassembling the formwork, pulling the wire 15 to pull the formwork from the concrete through the ring plate 11 to assist in disassembling the formwork The tool 10 is formed by inserting a single wire 15 through a pair of insertion holes 14 provided in the ring plate 11 with the hollow portion 12 interposed therebetween, and bending a protruding piece 13 formed integrally with the ring plate 11. The intermediate portion 15a of the wire 15 is pressed and held by the bent portion, and both end portions of the wire 15 are coupled via a flanged sleeve 16 that is extrapolated to the both end portions.
[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 first invention has a hollow part into which a shaft part protruding from a cone used for formwork is inserted, and a ring plate accommodated in the cone, and the ring plate And a wire rod led out to the outside from the shaft hole for the shaft portion drilled in the mold, and when the mold is disassembled, the wire can be pulled through the ring plate by pulling the wire A tool for disassembling a formwork to be peeled off from concrete, wherein one wire is inserted through a pair of insertion holes provided in the ring plate with the hollow portion interposed therebetween, and a protrusion formed integrally with the ring plate An intermediate portion of the wire is pressed and held by a bent portion formed by bending a piece, and both ends of the wire are coupled via a brazing sleeve that is extrapolated to the both ends. .

The second 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 stored in the cone, the ring plate, A mold for pulling the mold from the concrete through the ring plate by pulling the wire when disassembling the mold. A frame disassembly assisting tool, wherein one wire rod passes through a pair of groove portions provided on the ring plate across the hollow portion and opening on the outer peripheral side or inner peripheral side of the ring plate, and the ring plate An intermediate portion of the wire rod is pressed and held by a bent portion formed by bending an integrally formed protruding piece, and both end portions of the wire rod are coupled via a flanged sleeve that is extrapolated to the both end portions. It is characterized by being.

In the formwork disassembly aid according to the first and second inventions, a wrinkle-free sleeve may be used instead of the flanged sleeve.

In the first and second inventions, the intermediate portion of one wire is pressed and held by a bent portion formed by bending a protruding piece formed integrally with the ring plate, and both ends of the wire are brazed sleeves or wrinkleless sleeves Therefore, there is no need to use welding or the like for joining the members. Therefore, it takes no effort to manufacture the formwork disassembly assisting tool, and the formwork disassembly assisting tool can be easily manufactured. As a result, it is possible to keep the manufacturing unit price of the formwork disassembly assisting tool low.
In the present invention, the cross section of the wire can have any shape, and can be a circle, a rectangle, a rectangle, or the like.

In the formwork disassembly assisting tool according to the first and second inventions, the wrinkleless sleeve into which both ends of the wire are inserted is pressurized from the outside, and the axial cross section of the both ends of the wire and the wrinkles The axial section of the sleeve may be wavy.
In the formwork disassembly assisting tool according to the first and second inventions, the flanged sleeve into which both ends of the wire are inserted is pressed from the outside, and the axial cross section of the both ends of the wire and the flange The axial section of the attached sleeve may be wavy.

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. In particular, in the sleeve with a flange, since the flange is provided at the end of the sleeve, the sleeve itself does not break.

Mold dismantling aid according to the first and second invention, a ring plate that is housed in the cone, are consolidated in a ring plate, wire derived from drilled axial hole in the mold to the outside By pulling the wire rod, the mold can be easily peeled off from the concrete via the ring plate.

In the formwork disassembly aid according to the first and second inventions, the intermediate portion of one wire is pressed and held by a bent portion obtained by bending a protruding piece formed integrally with the ring plate, and both ends of the wire are Since the portions are coupled via the flanged sleeve or the wrinkleless sleeve, the production of the mold disassembly aid becomes easy, and the unit cost of the mold disassembly aid can be kept low.

It is a schematic diagram for demonstrating the usage method of the formwork disassembly assistance tool which concerns on the 1st 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. It is a schematic diagram of the cross section of the axial direction of the flanged sleeve which carried out pressure deformation. (A)-(C) are explanatory drawings which show the modification of a wire intermediate part, respectively. (A), (B) is explanatory drawing which shows the modification of a ring board, respectively. It is a perspective view of the formwork disassembly assistance tool which concerns on the 2nd Embodiment of this invention. It is a perspective view of the formwork disassembly assistance tool which concerns on the 3rd Embodiment of this invention. It is a top view of the ring board which comprises the same frame disassembly assistance tool. It is explanatory drawing which shows the modification of a groove part. It is a perspective view of the formwork disassembly assistance tool which concerns on the 4th Embodiment of this invention. It is the schematic diagram which showed the state at the time of use of the same-type frame disassembly assistance tool. It is a top view of a ring board and a wire.

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. Regarding the ring plate, for convenience, the surface with which the intermediate portion of the wire abuts is referred to as the “back” surface, and the opposite surface is referred to as the “front” surface.

[First Embodiment]
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 the first embodiment of the present invention has a hollow part 12 into which a shaft part 23 protruding from a cone 21 is inserted, and is stored in a recessed part 21a of the cone 21 in plan view. The donut-shaped ring plate 11, the wire 15 connected to the ring plate 11 and led out to the outside from the shaft hole 24 a formed in the mold 24, and the ends of the wire 15 are connected to each other. It is comprised roughly from the flanged sleeve 16 couple | bonded (refer FIG. 2, FIG. 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. On the straight line passing through the center of the ring plate 11, 1.5 φ insertion holes 14 through which the wires 15 are inserted are formed at positions equidistant from the center across the hollow portion 12.
Further, as shown in FIG. 3, on the inner peripheral side of the ring plate 11, an inverted U-shaped protruding piece 13 protruding into the hollow portion 12 is located at an equal distance from the pair of insertion holes 14, that is, a pair of insertions. It is provided on the perpendicular bisector of the line segment connecting the holes 14. As shown in FIG. 2, the protruding piece 13 formed integrally with the ring plate 11 is a bent portion bent on the back side of the ring plate 11, and presses the intermediate portion 15 a of the wire 15 so that the wire 15 does not move. Hold. The protruding length of the protruding piece 13 is set such that the tip of the protruding piece 13 does not protrude from the outer periphery of the ring plate 11 when the protruding piece 13 is bent.

The wire 15 is formed in a gate shape by bending a single stainless steel wire (diameter 1.2 mm, length of about 300 mm), and then the intermediate portion of the gate wire is bent in an out-of-plane direction and viewed in a plan view in a semicircular shape This is an intermediate portion 15a (see FIG. 3). Note that the intermediate portion 15a of the wire 15 has a semicircular shape in plan view so that the wire 15 does not pass through the hollow portion 12 of the ring plate 11.

The flanged sleeve 16 is made of aluminum, stainless steel, or steel, and is formed at a cylindrical portion 16a into which both ends of the wire 15 are inserted, and an end of one of the cylindrical portions 16a (the side into which the wire 15 is inserted). And an annular flange 16b (see FIG. 3). The flanged sleeve 16 is extrapolated at both ends of the wire 15 and compresses and compresses the side surface of the cylindrical portion 16a in the diametrical direction until the cylindrical portion 16a becomes flat. In that case, as shown in FIG. 4, you may carry out a pressure deformation so that the axial cross section of the both ends of the wire 15 and the axial cross section of the cylindrical part 16a may become wavy.

The assembly procedure of the formwork disassembly assisting tool 10 is as follows.
(1) A ring plate 11, a wire 15, and a flanged sleeve 16 formed in a predetermined shape are prepared.
(2) Insert both ends of the wire 15 into the pair of insertion holes 14 formed in the ring plate 11. At that time, the convex side of the intermediate portion 15a of the wire 15 is placed on the side where the protruding piece 13 of the ring plate 11 is present (see FIG. 3).
(3) The protruding piece 13 of the ring plate 11 is bent to the back side, and the intermediate portion 15a of the wire 15 is pressed and held by the bent portion where the protruding piece 13 is bent (see FIG. 2).
(4) The flanged sleeve 16 is extrapolated to both ends of the wire 15 to compress and compress the side surface portion of the cylindrical portion 16a. At that time, the flange portion 16b is placed on the side where the wire 15 is inserted (see FIG. 2).

When the mold disassembly aid 10 is used, the shaft portion 23 of the cone 21 is inserted into the hollow portion 12 of the ring plate 11, and the ring plate 11 is housed (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 15 is led out from the shaft hole 24 a for the shaft portion 23 formed in the mold 24, and the mold fastening fastener 25 is attached to the shaft portion 23 protruding to the outside from the mold 24.
At the time of dismantling the mold, after removing the mold fastening metal fitting 25 from the shaft portion 23, a bar or the like is inserted into the ring formed by the wire 15 exposed from the mold 24, and the wire 15 is pulled, whereby the ring plate 11 can be used to peel the formwork 24 from the concrete.

FIG. 5 shows a modification of the intermediate portion of the wire 15. In FIG. 5A, the intermediate portion 15b of the wire 15 is formed by a trapezoidal broken line. In FIG. 5B, the intermediate portion 15c of the wire 15 is formed by a gable roof-shaped broken line. In FIG. 5C, the intermediate portion 15d of the wire 15 is formed by a V-shaped broken line. In addition, the intermediate part of the wire 15 is not limited to these shapes, and the intermediate part of the wire 15 should just be arrange | positioned inside the outer periphery circle of the ring board 11, and the outer side of an inner periphery circle.

FIG. 6 shows a modification of the protruding piece of the ring plate. In FIG. 6A, the shape of the protruding piece 13a protruding toward the hollow portion 12a side of the ring plate 11a is in the form of droplets. In FIG. 6B, the protruding piece 13b is not formed on the hollow portion 12b side, but is formed as a protruding piece 13b protruding outward from the outer peripheral portion of the ring plate 11b.

[Second Embodiment]
In the formwork disassembly assisting tool 30 according to the second embodiment of the present invention, a wrinkle-free sleeve 31 is used instead of the flanged sleeve 16 (see FIG. 7). The wrinkle-free sleeve 31 is a sleeve without wrinkles such as a cylindrical sleeve or an oval sleeve. The wrinkle-free sleeve 31 is extrapolated to both ends of the wire 15, and the side surface portion of the wrinkle-free sleeve 31 is pressurized and compressed in the radial direction until the axial orthogonal cross section of the wrinkle-free sleeve 31 becomes flat. In addition, you may carry out a pressure deformation so that the axial direction cross section of the both ends of the wire 15 and the axial direction cross section of the wrinkle-free sleeve 31 may become wavy.

[Third Embodiment]
In the formwork disassembly assisting tool 35 according to the third embodiment of the present invention, a pair of groove portions 20 is provided in the ring plate 17 instead of the pair of insertion holes (see FIG. 8). As shown in FIG. 9, the groove portion 20 has a “<” shape or an inverted “<” shape in plan view, and is disposed symmetrically with a semicircular protruding piece 19 protruding toward the hollow portion 18 side. ing. Each groove 20 opens to the outer peripheral side of the ring plate 17, and the bottom of the groove 20 has a semicircular shape and is located on a straight line passing through the center of the ring plate 17. Thereby, when the wire 15 is pulled, the tensile force does not become an eccentric load, and the ring plate 17 does not tilt.

FIG. 10 shows a modification of the groove. In this modification, the groove portion 20a that is formed in a "<" shape or an inverted "<" shape in plan view opens on the inner peripheral side of the ring plate 17a and projects in a semicircular shape that protrudes toward the hollow portion 18a. It arrange | positions symmetrically on both sides of the piece 19a. The bottom of the groove 20a is semicircular and is located on a straight line passing through the center of the ring plate 17a.

Also in the present embodiment, a wrinkle-free sleeve 31 can be used instead of the flanged sleeve 16 as in the second embodiment. At that time, the side portion of the wrinkle-free sleeve 31 may be used by compressing and compressing it in the radial direction, or the axial cross section at both ends of the wire 15 and the axial cross section of the wrinkle-free sleeve 31 are wavy. You may use what was pressure-deformed so that it may become.

[Fourth Embodiment]
Unlike the first to third embodiments, a mold disassembly aid 40 according to the fourth embodiment of the present invention is formed integrally with a ring plate 41 and a pair of wires 43 (see FIG. 11). ). That is, as shown in FIG. 13, the ring plate 41 and the pair of wires 43 are formed from a single plate (thickness of about 1 to 2 mm). A pair of wire rods 43 extending from the outer peripheral portion of the ring plate 41 with the hollow portion 42 interposed therebetween are formed into a strip plate shape, and are arranged along a straight line passing through the center of the ring plate 41.

As the plate material, a galvanized steel plate, a stainless steel plate, a galvalume steel plate (a plate of aluminum and zinc alloy plated) or the like can be used. The outer diameter of the ring plate 41 is about 20φ, and the inner diameter is about 14φ. . Moreover, the wire 43 made into strip | belt board is made into width 2mm and length about 150mm, The edge part 44 is widened, and it is made width 6mm and length about 20mm. A small hole 44 a having a diameter of about 2 mm is formed at the center of the end 44.
When manufacturing the mold disassembly aid 40, after cutting out a thin plate made up of the ring plate 41 and the pair of wire rods 43 from the plate material, the pair of wire rods 43 are bent at the boundary between the ring plate 41 and the wire rod 43, The end portions 44 are overlapped with each other. And the crimping pin 45 is inserted in the small hole 44a formed in the edge part 44 of a pair of wire 43, and the edge parts 44 are couple | bonded by crimping the edge part of the crimping pin 45 (refer FIG. 11).
In addition, when joining the edge parts 44 of a pair of wire 43, you may use not the crimp pin 45 but the spot welding which is a kind of electric resistance welding instead of a rivet.

FIG. 12 shows a state when the formwork disassembly assisting tool 40 is in use. The shaft portion 23 of the cone 21 is inserted into the hollow portion 42 of the ring plate 41, and the ring plate 41 is accommodated (inserted) into the recessed portion 21 a of the cone 21. At that time, the shaft portion 23 is inserted through the hollow portion 42 of the ring plate 41 up to the base end portion 23a whose diameter is increased, and the ring plate 41 is placed on the bottom portion of the recessed portion 21a. By doing so, a distance from the shaft hole 24a drilled in the mold 24 to the ring plate 41 is secured, and the pair of wires 43 can be smoothly led out from the shaft hole 24a.

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 1st-3rd 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 aid, 11, 11a, 11b: Ring plate, 12, 12a, 12b: Hollow part, 13, 13a, 13b: Projection piece, 14: Insertion hole, 15: Wire (wire), 15a, 15b 15c, 15d: intermediate part, 16: sleeve with flange, 16a: cylindrical part, 16b: flange part, 17, 17a: ring plate, 18, 18a: hollow part, 19, 19a: projecting piece, 20, 20a: groove part 21: Cone, 21a: Recessed part, 22: Separator, 23: Shaft part, 23a: Base end part, 24: Mold frame, 24a: Shaft hole, 25: Metal fitting for mold fastening, 30: A tool for disassembling the mold , 31: wrinkle-free sleeve, 35, 40: formwork disassembly aid, 41: ring plate, 42: hollow portion, 43: wire rod, 44: end, 44a: small hole, 45: caulking pin

Claims (5)

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,
An intermediate portion of the wire rod by a bent portion formed by bending a protruding piece formed integrally with the ring plate through a pair of insertion holes provided in the ring plate with the hollow portion interposed therebetween. Is pressed and held, and both end portions of the wire rod are coupled via a flanged sleeve that is externally attached to the both end portions. 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,
A single piece of the wire rod is inserted through a pair of groove portions provided on the ring plate across the hollow portion and opening on the outer peripheral side or inner peripheral side of the ring plate, and a protruding piece formed integrally with the ring plate is provided. An intermediate portion of the wire rod is pressed and held by a bent portion formed by bending, and both ends of the wire rod are coupled via a flanged sleeve that is extrapolated to the both end portions. Dismantling aids. The formwork disassembly assisting tool according to claim 1 or 2, wherein a wrinkle-free sleeve is used instead of the flanged sleeve. The formwork disassembly assisting tool according to claim 3, wherein the wrinkleless sleeve into which both ends of the wire are inserted is pressurized from the outside, and an axial section of both ends of the wire and an axial section of the wrinkle sleeve Formwork disassembly assisting tool, characterized in that is made wavy. The formwork disassembly assisting tool according to claim 1 or 2, wherein the brazing sleeve into which both end portions of the wire are inserted is pressurized from the outside, and axial cross sections of the both ends of the wire rod and the shaft of the brazing sleeve A formwork disassembly assisting tool characterized in that the cross section in the direction is wavy.

Images