KR200349955Y1 - Apparatus for fixing a steel tube of a safe handrail - Google Patents

Abstract

Disclosed is a buried safety piece using a steel pipe scaffolding by embedding the buried fixing piece having a nut part or a bolt part in a concrete structure and then joining the nut part or bolt part of the buried fixing piece with a corresponding bolt part or nut part. The present invention relates to a steel pipe fixing device for installing a safety railing that enables simple and robust construction. The present invention is buried in the concrete structure is fixed to the formwork or concrete frame, buried fixing piece having a nut along the longitudinal direction; A connecting piece having a bolt part joined to a nut part of the buried fixing piece, and a gripping tube part extending from the bolt part to which a steel pipe for scaffolding is fitted; And it is made with a protective cap for sealing so that foreign matter does not flow when placing concrete into the nut portion of the buried fixing piece. In another method, a bolt part may be formed on the buried fixing piece, and a nut part fastened to the bolt part may be configured to correspond to the connection piece and the protective cap to perform the same function.

Description

Steel guarding device for safety railing installation {APPARATUS FOR FIXING A STEEL TUBE OF A SAFE HANDRAIL}

The present invention relates to a fixing device for installing a safety handrail by using a steel pipe scaffolding when building a building, and more specifically, a buried fixing piece having a nut part or a bolt part is embedded in a concrete structure, and then a nut part of a buried fixing piece or The present invention relates to a steel pipe fixing device for installing a safety railing for fastening a safety railing to a bolt part or a nut having a corresponding bolt or nut part.

1 is a construction drawing showing a device for fixing a conventional steel handrail for safety, as shown in the prior art, before reinforcing the concrete 10, the steel bars or pipes 12 of the diameter to which the scaffolding steel pipe 20 is fitted After embedding, some parts of the concrete were exposed to the outside after curing. The safety railings were constructed by inserting the steel pipe scaffold 20 into the exposed rebar or pipe 12.

However, the safety railings thus installed are shaken by the safety railings due to the play between the steel pipe 20 and the reinforcing steel bars or pipes 12 to which they are fitted. In addition, after dismantling the balustrade, there is a need to cut the exposed portion of the reinforcing steel or the pipe 12 that protrudes the concrete 10, and furthermore, the projected exposed portion is inconvenient in the floor finishing work, and the construction defect is reduced. There was a problem such as bringing.

In order to overcome this problem, the following mounting products have been released.

2 is a view showing a schematic structure of a scaffolding handrail manufactured for a conventional mounting. The handrail 30 is provided with a crimping handle 32 to be mounted on the concrete slave, it is fixed to the slave by rotating the crimping handle 32 provided on the lower end. Vertical rods 34 and horizontal rods 36 are connected to the crimping handle 32 to form a handrail 30. The crimp handle 32 is provided on at least left and right sides of the handrail 30 to provide a slave railing to the slave. It will be fixed.

These mounted safety railings are expensive to manufacture because they require a lot of manufacturing costs, and because they are fixed to the concrete structure only by the pressing force, they are not only weak in safety, but because they are made in one-piece, they are bulky and heavy, which makes them inconvenient to carry and store.

Accordingly, an object of the present invention is to solve the above-mentioned drawbacks, the buried fixing piece having a nut or bolt portion embedded in a concrete structure and then joining the connecting pieces having a corresponding bolt or nut portion It is to provide a steel pipe fixing device for the installation of safety railings to easily and securely construct a safety railing using a steel pipe scaffolding by easily fitting and fixing the steel pipe for scaffolding.

DETAILED DESCRIPTION A detailed description of embodiments of the present invention will be made with reference to the accompanying drawings, in which like numbers designate corresponding parts in the drawings.

1 is a construction drawing showing a device for fixing a safety railing using a conventional steel pipe scaffolding,

2 is a view showing a schematic structure of a device for supporting a conventional scaffolding handrail,

Figure 3 is a perspective view showing the configuration of an embodiment of a steel pipe fixing device for installing a safety railing using a steel pipe scaffold according to the present invention,

4 is a construction drawing showing a method of using the steel pipe fixing apparatus shown in FIG.

5 is a construction drawing showing a method for installing a scaffold after the construction in FIG. 4,

6 is a perspective view showing another embodiment of the steel handrail fixing device for installing a safety railing according to the present invention,

7 is a construction diagram showing a method of using the steel pipe fixing apparatus shown in FIG.

8 is a construction drawing showing a method for installing a scaffold after the construction in FIG. 7,

9A and 9B are perspective views illustrating embodiments in which a binding line fixing piece is mounted in the embodiments illustrated in FIGS. 3 and 6, respectively.

10 is a view showing a state of use of Figure 9a,

Figure 11 is a perspective view showing another embodiment of the steel pipe fixing device for installing a safety railing using a steel pipe scaffold according to the present invention modified to the embodiment shown in Figure 9a,

12 is a view illustrating a state of use of FIG. 11.

** Explanation of symbols for main parts of drawings **

110: buried fixing 112: support plate

112a: fixing hole 114: fastener

114a: nut portion 114b: outer shell

118: binding line fixing ring 119: flexible elastic member

120 connection part 122 bolt part

124: gripper 124a: jaw

124b: locking groove 130: protective cap

132: bolt portion 134: head portion

200: buried fixed piece 212: support plate

212 fixing hole 214 fastener

214a: Bolt part 214b: Sheath

218: binding line fixing ring 219: flexible elastic member

220: connecting piece 222: nut part

224: gripper 224a: jaw

224b: Hanging groove 230: Protective cap

232: nut part 234: outer shell

The steel pipe fixing device for installing a safety railing according to the first aspect of the present invention for achieving the above object is a device for installing a steel pipe scaffolding in a concrete structure, is fixed to the formwork or concrete frame reinforcement is embedded in the concrete structure, the longitudinal direction Buried fixing piece having a nut portion along; And a connection part including a bolt part joined to a nut part of the buried fixing piece, and a gripping tube part extending from the bolt part to which a steel pipe for scaffolding is fitted. It is further included in the nut part of the buried fixing piece and provided with a bolt portion for closing the nut portion and the head and the extended head portion, and a sealing cap for sealing the foreign matter does not flow into the nut portion of the buried fixing piece when concrete is poured. do.

The steel pipe fixing device for installing a safety railing according to the second aspect of the present invention for achieving the above object is a device for installing a steel pipe scaffolding in a concrete structure, is fixed to the formwork or concrete frame reinforcement is embedded in the concrete structure, the longitudinal direction Buried fixing piece having a bolt portion along; And a connection part including a nut part joined to the bolt part of the buried fixing piece, and a gripping tube part extending from the nut part to which a steel pipe for scaffolding is fitted. It consists of a nut part which is joined to the bolt part of the buried fixing piece and surrounds the bolt part and the outer shell of synthetic resin material surrounding the nut part, and a protective cap that protects the foreign matter from being attached to the bolt part of the buried fixing piece when concrete is placed. It includes more.

Hereinafter, with reference to the accompanying drawings will be described in detail with respect to a preferred embodiment of the present invention.

Figure 3 is a perspective view showing the configuration of one embodiment of the safety railing installation steel pipe fixing device according to the present invention, the present embodiment is a nut-type buried fixing piece 110 and the bolt-type connecting piece that is screwed to the buried fixing piece (110) Steel pipe fixing device 100 having a 120 is illustrated.

This apparatus is provided with a buried fixing piece (110) embedded in a concrete structure. The embedding fixing piece 110 is composed of a support plate 112 and a fastening cylinder 114 installed on the support plate 112. The support plate 112 has a plurality of fixing holes 112a through which nails, bolts, etc. pass through the periphery. The fastening cylinder 114 is provided with a nut part 114a therein, and the outside thereof is surrounded by the outer shell 114b of the synthetic resin material. The length of this fastening cylinder 114 is suitably designed according to the thickness of the concrete to be poured. That is, the length of the fastening cylinder is designed and manufactured so that the upper end of the fastening cylinder 114 is positioned approximately 10 mm below the upper surface of the concrete (exposure surface) and is completely buried. The nut portion 114a of the fastening cylinder 114 is preferably made of metal, and P.V.C is suitable for the shell 114b even in synthetic resin. The support plate 112 is also preferably made of P.V.C material.

The buried fixing piece 110 is fastened to the connecting piece 120 for connecting a steel pipe (not shown). The connecting piece 120 includes a bolt portion 122 fastened to the nut portion 114a of the buried fixing piece 110, and a grip cylinder portion 124 is connected to the upper portion of the bolt portion 122. . The metal plate 126 is fixed to the bottom surface of the holding cylinder part 124 to fix the bolt part 122, and the bolt part 122 is attached to the center of this metal plate 126 by a welding method or the like. . The gripper 124 is shaped into a cylindrical shape with a diameter slightly smaller than that of the steel pipe so that the cylindrical steel pipe can be fitted from the outside, and the jaw 124a is underneath so that the lower end of the steel pipe can be caught and supported. In addition, the upper portion of the holding cylinder portion 124 is formed opposite to the N-shaped locking groove 124b is opened to the top. The locking grooves 124b are inserted into the locking pins of the steel pipes fitted into the gripping tube parts 124 and then rotated to prevent separation of the connected steel pipes. In particular, the gripping barrel 124 is made of a length that the steel pipe is inserted and connected enough to withstand the external force, preferably the distance from the locking groove 124b to the portion of the jaw 124a is 170mm or more It is good, so that the part to which the locking pin is fixed is also designed to be 170mm or more from the end of the steel pipe to be fitted to the locking grooves (124b). On the other hand, the steel pipe may be fitted to the inside of the gripping barrel 124, in this case, the connecting piece 120 also has the same function.

The device is provided with a protective cap 130 to prevent foreign matter, for example, concrete, to enter the nut portion 114a of the buried fixing piece 110 when the buried fixing piece 110 is embedded in concrete. The protective cap 130 is composed of a bolt portion 132 fastened to the nut portion 114a of the buried fixing piece 110, and a head portion 134 to which the bolt portion 132 is fixed. The head 134 is made of a synthetic resin material, preferably P.V.C material.

4 is a construction diagram showing a method of using the steel pipe fixing apparatus shown in FIG.

In order to install the device, the buried fixing piece 110 in the formwork 1 in a state in which the bolt portion 132 of the protective cap 130 is fastened to the nut portion 114a of the buried fixing piece 110 and coupled thereto. The fixing plate 112 of the mounting is fixed. At this time, if the material of the formwork (1) is made of wood nails (3) into the fixing holes (112a) of the support plate 112 to be fixed to the mold (1) or to fix the adhesive material of the support plate 112 You may use any of the methods of apply | coating to the bottom surface and sticking to the formwork 1. However, when iron formwork is used, the latter method of applying an adhesive to the formwork 1 by applying an adhesive to the bottom surface of the support plate 112 is appropriate. When the concrete 5 is poured in the state in which the buried fixing piece 110 is fixed to the formwork 1, the buried fixing piece 110 is completely embedded in the concrete 5, and the buried fixing piece 110 is disposed. The protective cap 130 is fastened to the concrete (5) will come out. At this time, the buried fixing piece 110 is preferably buried below about 10mm from the upper surface in the concrete structure, then the protective cap 130 is fastened to the head is buried about 10mm in the concrete structure (5).

When the concrete is hardened, the protective cap 130 is dismantled and separated from the buried fixing piece 110. As a result, a hole is formed in the concrete structure 5, and the hole is in communication with the nut part 114a of the buried fixing piece 110. Then, when the bolt portion of the connecting piece (not shown) is fastened to the nut part 114a of the buried fixing piece 110 embedded in the concrete 5, the connecting piece is firmly fixed to the concrete structure 5. Of course, when dismantling the steel pipe scaffolding after the use of the safety railing, if the connecting piece is rotated in reverse, the separating of the connecting piece is simple, and the buried fixing piece does not protrude above the concrete structure (5), so the finishing work is convenient.

Now, the buried fixing piece (110) described above is embedded in the concrete structure (5) and the connecting piece to the buried fixing piece (110), and then using this device fixed in this way to construct a safety railing substantially using steel pipe scaffolding The method will be described in detail below with reference to FIG. 5.

5 is a construction drawing showing a method for installing a steel pipe scaffolding after the construction of FIG. 4, when the steel pipe 140 is simply inserted into the gripping tube part 124 of the connection piece 120 fixed to the concrete structure 5 described above with reference to FIG. 4. Steel pipe 140 is coupled, in this case by fitting the locking pins 142 of the steel pipe 140 to the locking grooves (124b) formed in the gripping barrel 124 and fully entered after rotating the steel pipe 140 ( Slightly twisted) The locking pin 142 is caught in the N-shaped locking grooves 124b to prevent the steel pipe 140 from being separated from the gripping barrel 124.

According to the site characteristics of the structure, the device is buried and installed at intervals of 3 ~ 5M, and installed vertically by connecting the steel pipes 140 to the connecting pieces 120 of the device installed in this way, then the vertical steel pipe 140 The steel pipe 140a is horizontally connected to the field using the clamps 150. The clamp 150 is usually a fixed type for connecting the bar at a right angle and an automatic type capable of adjusting the angle, and is installed in a vertical steel pipe connected to the device by applying a suitable type as a conventional product that is already used in the horizontal or Steel pipes are connected by diagonal lines to construct steel pipe scaffolding as shown.

As shown in the figure, it is preferable that the safety railings are installed in two stages by fixing horizontal steel pipes one at a height of 800 mm and 1100 mm from the bottom, respectively.

Figure 6 is a perspective view showing another embodiment of the safety railing installation steel pipe fixing apparatus according to the present invention. This embodiment illustrates a steel pipe fixing device 200 having a bolt-type buried fixing piece 210 and a nut-shaped connecting piece 220 that is screwed to the buried fixing piece 210.

The buried fixing piece 210 of this apparatus is comprised from the support plate 212 and the fastening cylinder 214 installed on this support plate 212. The support plate 212 has a plurality of fixing holes 212a through which nails, bolts, etc. pass through the periphery. The fastening cylinder 214 is a structure in which the outer shell 214b of the synthetic resin material surrounds the metal bolt portion 214a, and the outer shell 214b is suitable for P.V.C even in the synthetic resin. The support plate 212 is also preferably made of P.V.C material.

The buried fixing piece 210 is fastened to the connecting piece 220 for connecting the steel pipe. The connecting piece 220 has a nut 222 fastened to the bolt portion 214a of the buried fixing piece 210 at the lower end, and the nut 222 is fixed to the lower end inner side of the gripping tube part 224. Specifically, the metal plate 226 is fixed to the bottom surface of the gripping barrel 224 for fixing the nut 222, and through the hole communicating with the female spiral portion of the nut 222 at the center of the metal plate 226. The nut 222 is formed by an attachment method such as welding. In addition, the nut 222 may be formed by integrally machining (tap processing) the metal plate 226. The gripper 224 is shaped to have a cylindrical shape with a diameter slightly smaller than that of the steel pipe so that the cylindrical steel pipe can be fitted from the outside, and the jaw 224a is underneath so that the lower end of the steel pipe can be caught and supported. In addition, the upper portion of the grip cylinder portion 224 is formed opposite to the N-shaped locking groove 224b is opened to the top. The locking grooves 224 b are rotated after the locking pins of the steel pipes fitted into the gripping tube portions 224 to prevent the separation of the connected steel pipes. In particular, the gripping tube portion 224 is made of a length that the steel pipe is inserted and connected enough to withstand the external force, preferably the distance from the locking groove 224b to the part where the jaw 224a is raised is 170mm or more. It is good, so that the part to which the locking pin is fixed is also designed to be spaced 170 mm or more away from the end of the steel pipe so that it can be fitted in the locking grooves (224b).

The device is provided with a protective cap 230 to prevent foreign matter, for example, concrete, to adhere to the bolt portion 214a of the buried fixing piece 210 when the buried fixing piece 210 is embedded in concrete. The protective cap 230 is composed of a nut portion 232 corresponding to the bolt portion 214a of the buried fixing piece 210 and an outer shell 234 surrounding the nut portion 232. The nut part 232 and the outer shell 234 are made of a synthetic resin material, preferably made of a PVC material integrally, that is to form a female spiral inside the outer shell 234 to form the nut portion 232 good.

FIG. 7 is a construction diagram showing a method of using the steel pipe fixing apparatus shown in FIG. 6, and FIG. 8 is a construction diagram showing a method of installing a safety railing using a steel pipe scaffold after the construction of FIG. 7.

As shown in FIG. 7, the buried fixing piece 210 is formed in the formwork 1a by fastening the nut part 232 of the protective cap 230 to the bolt portion 214a of the buried fixing piece 210. The support plate 212 of) is seated and fixed. At this time, if the material of the die (1a) is made of wood nails (3a) into the fixing holes (212a) of the support plate 212 to be fixed to the mold (1a) or to fix the adhesive material of the support plate 212 It is applied to the bottom surface and attached to the formwork 1a. However, when the iron formwork is used, the latter method of applying the adhesive to the formwork 1a by applying an adhesive to the bottom surface of the support plate 212 is appropriate. When the concrete 5a is poured in the state in which the buried fixing piece 210 is fixed to the formwork 1a, the buried fixing piece 210 is completely buried in the concrete 5a, and the buried fixing piece 210 is placed. The protective cap 230 is fastened to the concrete (5a) is to come out. The protective cap 230 is adjusted to the height of the concrete structure 5a before placing the concrete so that it is not buried in the concrete 5a. When the concrete is hardened, the protective cap 230 is dismantled and separated from the buried fixing piece 210. Then, the bolt portion 214a of the buried fixing piece 210, which was protected by the protective cap 230, protrudes above the concrete structure 5a. When the nut part 222 of the connecting piece 220 is fastened to the protruding bolt part 214a of the buried fixing piece 210, the connecting piece 220 is firmly seated on the concrete structure 5a. It is fixed. Of course, when dismantling after use of the scaffold, if the connection piece 220 is rotated in reverse, the separation of the connection piece 220 is simply performed.

When the steel pipe 240 is screwed into the connecting piece 220 of the fixed device, the locking pin 242 of the steel pipe 240 is firmly fixed to the locking groove 224b of the connecting piece 220. In this manner, the vertical steel pipes 240 are connected to and fixed to the apparatus embedded in the concrete structure 5a at regular intervals, and then the horizontal steel pipes 240a are connected to the vertical steel pipes 240 by using the clamps 250. When connected, steel pipe scaffolding can be constructed. Such steel scaffolding serves as a safety railing to protect the safety of workers.

9A and 9B are perspective views illustrating embodiments in which a binding line fixing ring is mounted on the embodiments illustrated in FIGS. 3 and 6, respectively.

The apparatus can provide a binding line fixing ring (118, 218) on the outer surface of the fastening cylinders (114, 214) of the buried fixing piece (110, 210) for stable fixing of the buried fixing piece (110,210) and in any situation. . The connection line fixing rings 118 and 218 are provided with connection holes 118a and 218a at regular intervals. The wires 118a and 218a may be inserted into the wires and the like to be tied to reinforcing bars of the concrete before placing the fixing pieces 110 and 210. The fixing method through the connection holes 118a and 218a may be usefully used in places where the concrete placing thickness is high, for example, the support plates 112 and 212 and the formwork of the buried fixing pieces 110 and 210 are far away from each other. 9A and 9B show embodiments in which the tie line fixing rings 118 and 218 are applied to the nut-type buried piece 110 and the bolt-type buried piece 210, respectively. The bundling line fastening rings 118 and 218 are manufactured to be fitted into and fixed to the outer shells 114b and 214b of the buried fixing pieces 110 and 210, or integrally molded with the fastening tube outer shells 114b and 214b of the buried fixing pieces 110 and 210. Can be. A method of using the above-described binding line fixing ring will be described in detail with reference to FIG. 10.

FIG. 10 is a view illustrating a use state of FIG. 9A.

As shown, when the thickness of the concrete 5b is high, it is difficult to fix the support plate 112 of the buried fixing piece 110 to the formwork. Therefore, at this time, the wire 160 is hooked to the connection hole 118a of the binding line fixing ring 118 provided in the buried fixing piece 110 to be fixed to the reinforcing bar 7b forming a skeleton of the concrete structure 5b. The 110 may be fixed at an appropriate position. Since the connection hole 118a is provided in all directions while the binding line fixing ring 118 is rotated, it is preferable to fix the reinforcing bar 7b to the wires 160 at least two or three places facing each other. As such, when the concrete 5b is poured and installed in the state where the buried fixing piece 110 is fixed to the reinforcing bar 7b with the wire 160, the buried fixing piece 110 floats at an intermediate position of the concrete structure 5b. It is to be buried, the protective cap 130 coupled to the buried fixing piece 110 is positioned exposed to the concrete structure (5b).

FIG. 11 is a perspective view illustrating another embodiment of the buried fixing piece of the apparatus, in which the embodiment illustrated in FIG. 9A is modified, and FIG. 12 is a view illustrating a use state of FIG. 11.

As the buried fixing piece 110 of the device is shown in Figure 11 via a flexible elastic member 119 to vary the distance between the support plate 112 and the fastening tube 114 or to bend freely Can be combined. The buried fixing piece 110 of such a configuration, when the support plate 112 is difficult to reach the beam when installed in the high beam as shown in Figure 12 bending the flexible member 119 to the formwork 1b of the beam side surface By fixing the support plate 112 to the side die (1b) with nails or adhesives, and furthermore, the wire 160 to the binding line fixing ring 118 to be fixed to the reinforcing bar (7c) to more securely embed the buried fixing piece (110) Can be fixed. As such, by fixing the upper and lower portions of the buried fixing piece 110, more stable and solid support is possible. Of course, when installing the buried fixing piece 110, the protective cap 130 is put on the buried fixing piece 110, the concrete cap (5c) after placing and curing the protective cap 130 is buried fixing piece ( 110).

The embodiments disclosed herein are only presented by selecting the most preferred examples to help those skilled in the art from the various possible examples, the technical spirit of the present invention is not necessarily limited or limited only by this embodiment, the present invention Various changes and modifications are possible within the scope without departing from the spirit of the invention, as well as other equivalent embodiments.

As described above, the steel pipe fixing device for installing a safety railing according to the present invention is to be buried in the concrete structure after the buried fixing piece having a nut part or a bolt part in the nut part or bolt part of the buried fixing piece or the corresponding bolt part or By joining the connecting pieces having a nut part, there is an effect that can be easily and firmly constructed a safety railing using a steel pipe scaffold.

In addition, since the buried fixing piece and the connecting piece form a male and female pair and are installed in a concrete structure, the safety railing can be installed with a simple structure. Therefore, the installation cost of the safety railing is reduced, and assembling is easy, anyone can install and dismantle easily. In particular, since the bolt and nut are combined, the steel pipe scaffolding is strong and safe after installation, which ensures the safety of the operator, and does not require the use of specially manufactured complicated safety railings. This has the advantage of reducing labor costs.

Claims (9)

In the device for installing a steel pipe scaffolding in a concrete structure, A buried fixing piece which is fixed to a formwork or concrete framework reinforcement and is embedded in a concrete structure, and has a nut part along a longitudinal direction; And And a connecting piece including a bolt part joined to a nut part of the buried fixing piece, and a gripping tube part extending from the bolt part to fit a steel pipe for a scaffold. According to claim 1, It is provided with a bolt portion and the head portion and the extended head portion to be joined to the nut portion of the buried fixing piece, and sealed so that foreign matter does not flow into the nut portion of the buried fixing piece when placing concrete. Safety railing installation steel pipe fixing device further comprises a protective cap. The method of claim 1, wherein the nut portion of the buried fixing piece is formed of a fastening tube wrapped around the outer shell of the synthetic resin material, the lower end of the fastening cylinder is provided with a plurality of fixing holes through which the fastening cylinder to the formwork nail or adhesive material Steel rail fixing device for the installation of safety railings, characterized in that the support plate is provided for fixing. In the device for installing a steel pipe scaffolding in a concrete structure, A buried fixing piece which is fixed to a formwork or concrete framework reinforcement and is embedded in a concrete structure, and has a bolt portion along a longitudinal direction; And And a connecting piece having a nut part joined to a bolt part of the buried fixing piece, and a gripping tube part extending from the nut part to fit a steel pipe for scaffolding. 5. The method of claim 4, wherein the nut part is joined to the bolt part of the buried fixing piece and consists of a nut part covering and protecting the bolt part and a synthetic resin envelope surrounding the nut part, and foreign matter is not attached to the bolt part of the buried fixing piece when concrete is placed. Steel rail fixing device for the installation of safety railings further comprising a protective cap to protect. The method of claim 4, wherein the bolt portion of the buried fixing piece is formed of a fastening tube wrapped with a synthetic resin material, the lower end of the fastening cylinder is provided with a plurality of fixing holes through which the nail passes through the fastening cylinder nail or adhesive material Steel rail fixing device for the installation of safety railings, characterized in that the support plate for fixing with. The method of claim 3 or 6, wherein the predetermined portion of the fastening barrel is further provided with a binding line fixing ring which is drilled as the binding holes for fixing the buried fixing piece to the concrete skeleton reinforcement using a wire Steel rail fixing device for the installation of safety railings. 8. The steel pipe fixing apparatus according to claim 7, wherein the fastening tube and the support plate of the buried fixing piece are connected to a flexible stretchable member having a variable length and an adjustable angle. [5] The steel pipe fixing for safety railings according to claim 1 or 4, wherein the hook-shaped locking grooves are formed at the upper end of the gripping portion of the connecting piece so as to be open to the outside to secure the locking pins of the steel pipes. Device.