JPH078695U - Spray protection tube - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a protection tube for spraying that can be securely fixed to a through hole of a steel frame. [Structure] This blowing protection tube 1 is provided with support claws 3 and 4 for sandwiching a peripheral edge portion of a through hole 12 from both sides on an outer peripheral surface of a steel plate 2 which is rolled into a cylindrical shape, and a support claw 4 made of spring steel. The protective tube 1 for blowing is fixed to the through hole 12 by the elastic force of. With the above configuration, the spray protection tube can be reliably fixed to the through hole by the support claw.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a blowing protection tube for supporting a pipe material such as a round duct or a pipe which is passed through a through hole formed in a steel frame of a building, and particularly, a blowing protection for holding the peripheral edge portion of the through hole. Regarding tubes.

[0002]

[Prior art]

 Conventionally, there is a conventional example shown in Fig. 9 as a blowing protection tube that supports a pipe material or the like that is passed through a through hole formed in a steel frame of a building. In this conventional example, a through hole 82 is bored in a steel frame 81 provided on the lower surface of the deck plate 80, and a blowing protection tube 83 is attached to the through hole 82. As shown in FIG. 10, the blowing protection tube 83 is formed by rolling a steel plate into a cylindrical shape to have a diameter slightly larger than that of the through hole 82. The blowing protection tube 83 is fixed to the through hole 82 by its own elastic force, and in this state, a refractory material such as asbestos RW is blown around the steel frame 81 and the blowing protection tube 83. After that, the pipe material 83 is inserted into the blowing protection pipe 83.

[0003]

[Problems to be solved by the device]

 In the above-mentioned conventional example, even if the refractory material is sprayed, a space for passing the pipe material 84 is secured inside the spray protection tube 83, and the work of inserting the pipe material 84 into the space is simplified. However, the diameter of the through hole 82 varies, and the blowing protection tube 83 is only fixed to the through hole 82 by its own elastic force by rolling the steel plate into a cylindrical shape. There is a problem that the pipe 83 is easily moved in the through hole 82 and the protection pipe 83 is inclined by the pressure of the spray. SUMMARY OF THE INVENTION In order to solve the problems in the prior art, the present invention has an object to provide a blowing protection tube that can be reliably fixed to a through hole of a steel frame.

[0004]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention is to insert into the through hole formed in the steel frame of a building so as to support a pipe material, etc., which is passed through the through hole, and to spray in a gap with the through hole. In the protection tube for spraying that is used by locking with the above, when it is inserted into the through hole and locked, it is rolled into a cylindrical shape and used in the expanded state on the surface of the rectangular iron plate member, and in the used state the peripheral edge of the through hole. It is a protective tube for spraying characterized in that a plurality of pairs of support claws sandwiching from both sides thereof are provided. Furthermore, at least one of the pair of supporting claws is a spray protection tube made of spring steel. Further, one or both of the pair of supporting claws is a spraying protection tube formed by cutting and raising a part of the iron plate member. Furthermore, the blowing protection tube has an engaging portion that engages with the inner peripheral surface of the through hole of the steel frame and positions the cylindrical body in the radial direction of the through hole. The protection tube may be supported on the steel frame by a magnet. In this case, the supporting claws are convenient because they serve as a self-adsorbing part.

[0005]

[Action]

 According to the present invention, the peripheral edge portion of the through hole of the steel frame is clamped from both sides by the support claws, and the clamping force is used to fix the spray protection tube to the through hole of the steel frame. In addition, the elastic force of the spring steel support claws sandwiches the peripheral edge of the through-hole of the steel frame from both sides and securely fixes the spray protection tube to the peripheral edge of the through-hole. Furthermore, one or both of the supporting claws are formed by cutting and raising a part of the iron plate member, and the peripheral edge of the through hole is sandwiched from both sides by the supporting claws. Then, the cylinder is positioned in the radial direction of the through hole by engaging the engaging portion with the inner peripheral surface of the through hole of the steel frame, and the relative position of the cylinder with respect to the through hole is adjusted. As a result, it is possible to securely fix the spray protection tube to the through hole with the support claw. The protection tube can be supported on the steel frame by using a magnet attracted to the support claw.

[0006]

【Example】

 Embodiments embodying the present invention will be described below with reference to the accompanying drawings to provide an understanding of the present invention. It should be noted that the following embodiment is an example in which the present invention is embodied and does not limit the technical scope of the present invention. 1 is a perspective view showing a spraying protection tube according to an embodiment of the present invention, FIG. 2 is a longitudinal sectional view showing a spraying protection tube mounted on a steel frame, and FIG. 3 is a spraying protection tube. 4A is a vertical cross-sectional view showing another embodiment of the present invention, FIG. 4A is a vertical cross-sectional view of a support claw formed by cutting and raising, and FIG. 4B is a state in which a blowing protection tube is fixed to a through hole. Fig. 5 (a) is a vertical sectional view showing another embodiment of the supporting claws formed by cutting and raising, and Fig. 5 (b) shows a state in which the blowing protection tube is fixed to the through hole. Fig. 6 (a) is a plan view showing a developed state of a steel plate showing another embodiment of the supporting claw formed by cutting and raising, and Fig. 6 (b) is a rolled state of the steel plate. Fig. 7 (a), (b), (c) and (d) are the perspective views showing Explanatory view showing a press working for forming the supporting pawls Ri, FIG. 8 is a side sectional view showing a state in which a protective tube for blowing using a magnet supported on the steel frame. In FIG. 1 showing a spraying protection tube 1, a steel plate 2 cut into a rectangular shape in a developed state is rolled into a cylindrical shape to form a main body 6. The main body 6 is formed at, for example, three locations in the circumferential direction, which face each other. A set of support claws 3 and 4 is erected on the main body 6. First, one supporting claw 3 is made of a steel plate and is provided substantially vertically to the outer peripheral surface of the main body 6, and the tip of the supporting claw 3 is bent outward. The supporting claws 4 are made of spring steel, are inclined so as to approach the supporting claws 3, and have their tips bent outward. As shown in FIG. 2, when the blowing protection tube 1 having the supporting claws 3 and 4 is fixed to the steel frame 11 made of H-shaped steel provided on the deck plate 10, the steel frame 11 is penetrated. The blowing protection tube 1 is inserted into the hole 12, and the supporting claws 3 and 4 sandwich the peripheral edge portion of the through hole 12 from both sides thereof, whereby the blowing protection tube 1 is fixed. When the supporting claws 3 and 4 clamp the peripheral edge of the through hole 12 from both sides, the elasticity of the supporting claw 4 clamps the peripheral edge of the through hole 12, so that the diameter of the through hole 12 varies. Even in some cases, the spray protection tube 1 is securely fixed to the through hole 12. Then, in this state, a refractory material RW such as asbestos is sprayed around the steel frame 10 and the spray protection tube 1. After that, a round pipe, a duct or the like 15 is inserted into the blowing protection tube 1.

In particular, as shown in FIG. 3, when the engaging portion 5 is provided on the inner surface of one of the support claws 3, the engaging portion 5 is brought into contact with the inner peripheral surface of the through hole 12. It is also possible to position the spray protection tube 1 in the radial direction of the through hole 12 and form a gap 16 between the lower surface of the spray protection tube 1 and the through hole 12. In this case, the gap 16 is formed to have a uniform width, and the refractory material is filled in the gap 16 to more firmly fix the spray protection tube 1. The blowing protection tube 1 is not limited to the case where the main body 5 and the supporting claws 3 and 4 are provided separately from the main body 5 as described above, and the steel plate 2 of the main body 5 may be formed by cutting and raising. For example, as shown in FIG. 4A, a steel plate 2 is cut and raised to form a pair of support claws 20 and 21 that face each other, and an opening 22 is formed between the support claws 20 and 21. Has been formed. The support claws 20 and 21 are bent so that the intermediate portions thereof project inward, and the interval L between the projecting tips 23 and 24 is set to be slightly smaller than the wall thickness T of the through hole 12. In such support claws 20 and 21, with the inner peripheral surface of the through hole 12 abutting the outer peripheral surface of the main body 5, as shown in FIG. When the peripheral portion of the hole 12 is clamped, the projecting tips 23 and 24 are pressed against both sides of the peripheral portion of the through hole 12 by the elastic force of the supporting claws 20 and 21, so that the blowing protection tube 1 is fixed to the through hole 12. Further, as shown in FIG. 5 (a), the middle portions of the support claws 30 and 31 are bent so as to project outward in the radial direction of the main body 5, and the leading edges of the support claws 30 and 31 are aligned with the periphery of the through hole 12. You may make it press-contact on both surfaces.

Further, as shown in FIG. 6A, a set of three supporting claws 32 ... And a pair of two supporting claws 33, 33 are cut and raised on the rectangular steel plate 2 in the expanded state. It is also possible to form the protective plate 1 for spraying by rolling the steel plate 2 into a cylindrical shape as shown in FIG. 6B. In this case, each set of three supporting claws 32 is arranged so as to form three apexes of a triangle, and the clamping force of each supporting claw 32 at the peripheral portion of the through hole 12 is improved. A processing method for forming the support claws by cutting and raising will be described. For example, in order to form the support claws 20 and 21 shown in FIG. 4, as shown in FIG. 7A, the tips of the support claws 20 and 21 are punched from the back surface side of the steel plate 2 with a punch 40 having a triangular tip. The part is bent and cut into a tongue shape, and as shown in FIG. 7 (b), the base end of the punch 40 bends the base ends of the support claws 20 and 21 from the upper side to the lower side to form an intermediate portion. Supporting claws 20 and 21 whose parts project inward are formed. Next, to form the supporting claws 30 and 31 shown in FIG. 5, as shown in FIG. 7C, the supporting claws 30 and 31 are punched with a punch 41 whose central portion projects in a triangular shape from the back surface side of the steel plate 2. By cutting the steel plate 2 while bending the middle part, the support claws 30 and 31 in which the middle part is bent outward in the radial direction of the main body 5 are formed. Further, as shown in FIG. 6, when the steel plate 2 is left on the intermediate portion 35 of the support claws 33 and 34, as shown in FIG. The two claws 42, 43 are used to fold the supporting claws 33, 34 from the base end while cutting the tip ends of the supporting claws 33, 34, and then the punches are replaced to bend the supporting claws 33, 34 into a predetermined shape. FIG. 8 shows a case where the steel frame 11 and the support claw 4 are coupled by the magnet 43. In this case, the position of the protective tube 1 can be changed relatively easily.

[0009]

[Effect of device]

 Since the spray protection tube according to the present invention is constructed as described above, the spray protection tube is inserted into the through hole by the support claws that sandwich the peripheral edge of the through hole formed in the steel frame from both sides. Can be securely fixed.

[Brief description of drawings]

FIG. 1 is a perspective view showing a protection tube for spraying according to an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view showing a usage state in which a blowing protection tube is attached to a steel frame.

FIG. 3 is a vertical cross-sectional view showing another embodiment of a spraying protection tube.

FIG. 4A is a vertical cross-sectional view of a support claw formed by cutting and raising, and FIG. 4B is a vertical cross-sectional view showing a state in which a blowing protection tube is fixed to a through hole.

5A is a vertical cross-sectional view showing another embodiment of a support claw formed by cutting and raising, and FIG. 5B is a vertical cross-sectional view showing a state in which the blowing protection tube is fixed to a through hole.

6A is a plan view showing a developed state of a steel plate showing still another embodiment of a support claw formed by cutting and raising, and FIG. 6B is a perspective view showing a rolled state of the steel plate.

7 (a), (b), (c) and (d) are explanatory views showing press working when forming the supporting claws by cutting and raising.

FIG. 8 is a side sectional view showing a state in which a blowing protection tube is supported by a steel frame using a magnet.

FIG. 9 is a vertical cross-sectional view showing a usage state of a conventional blowing protection tube.

FIG. 10 is a perspective view showing a conventional spraying protection tube.

[Explanation of symbols]

 1 ... Protective tube for spraying 2 ... Steel plate 3, 4 ... Supporting claw 11 ... Steel frame 12 ... Through hole 15 ... Pipe material

Claims (5)

[Scope of utility model registration request] 1. A plug inserted into the through hole to support a pipe material or the like that is passed through the through hole formed in a steel frame of a building,
In a protection tube for spraying, which is used by being locked by spraying in the gap with the through hole, when inserted into the through hole and locked, it is rolled into a cylindrical shape and used in the expanded state on the surface of a rectangular iron plate member, A protection tube for spraying, comprising a plurality of pairs of support claws for sandwiching the peripheral portion of the through hole from both sides in a use state. 2. The spray protection tube according to claim 1, wherein at least one of the pair of support claws is made of spring steel. 3. One or both of the pair of support claws,
The protection tube for spraying according to claim 1 or 2, which is formed by cutting and raising a part of an iron plate member. 4. The engagement member according to claim 1, further comprising an engagement portion that engages with an inner peripheral surface of the through hole of the steel frame and positions the cylindrical body in a radial direction of the through hole. Protective tube for spraying. 5. The protection for spraying according to claim 1, wherein a magnet is attracted to the supporting claw and is supported by a steel frame through the magnet. tube.