Fall prevention safety device for gang forms

Abstract

The present invention relates to a fall prevention safety device for a gang form, and more specifically, it is configured to prevent the gang form from falling by attaching a spike piece to the front plate of the gang form and fixing it to the concrete layer curing inside, and to lift the gang form after separating the spike piece from inside the structure as a final step during the lifting and dismantling operation of the gang form. This invention is designed to prevent safety accidents caused by a worker falling. In an embodiment of the present invention, a fall prevention safety device (100) for preventing the fall of a gang form, A fixed support member (10) having a fixed support plate (11) attached to the upper side of the front plate (2) of the gang form (1) and a fixed frame (15) formed protruding forward; A pull-out frame (20) assembled in the frame insertion opening (16) of the fixed frame (15); A slide member (40) is included, which is coupled to the front of the above-mentioned withdrawal frame (20) and has a spike piece (41) formed thereon that is embedded in the concrete layer (5) in the downward direction.

Description

Technology Field

[0001] The present invention relates to a fall prevention safety device for a gang form, and more specifically, it is configured to prevent the gang form from falling by attaching a spike piece to the front plate of the gang form and fixing it to the concrete layer curing inside, and to lift the gang form after separating the spike piece from inside the structure as a final step during the lifting and dismantling operation of the gang form. This invention is designed to prevent safety accidents caused by a worker falling. Background Technology

[0003] Generally, the exterior walls of structures such as apartments, buildings, or commercial buildings are mostly constructed by pouring concrete. To construct the exterior walls of a structure, formwork formed from large steel gang forms is used. This formwork serves to maintain a predetermined shape and dimensions while the concrete is curing, and also protects against external influences while preventing moisture leakage until the concrete hardens.

[0005] As such, gang forms are manufactured using steel to prevent deformation caused by the pressure of poured concrete, ensure the surface quality of the cured exterior wall, facilitate installation and removal work, and enable reusable applications. Approximately 20 to 30 gang forms are used to construct the exterior wall of one apartment building, and each gang form is composed of a large steel structure weighing about 3 to 4 tons and having a height of about 9 meters.

[0006] The above gang forms are lifted one by one using a tower crane installed at the construction site. The gang form, which consists of a single structure, is lifted upwards after releasing the tie bolts fixed to the concrete outer wall and reinstalled with the upper Euroform using tie bolts. Then, the process of lifting the gang form placed on the adjacent side after releasing the tie bolts as described above and installing it on the Euroform from the side of the upper gang form is repeated.

[0007] To safely perform the above-mentioned gang form lifting operation, it is preferable to release only the tie bolts of the relevant gang form while keeping the gang forms positioned to the side fixed, and then lift by attaching the tower crane hook to the lifting hook of the relevant gang form; however, for the sake of convenience, it was frequent to perform the lifting operation after releasing the tie bolts securing the surrounding gang forms.

[0008] Therefore, there was a problem in that if a collision occurred with a surrounding formwork due to wind or operational error during the lifting of the formwork, a fall accident occurred in which the formwork placed on the side fell, and the fall of the formwork corresponding to the large structure resulted in a major fall accident causing massive human and material damage.

[0010] Accordingly, as a prior art to prevent the fall of the gang form as described above, an anchor bolt locking device was proposed and used, such as in Korean Registered Utility Model No. 20-0470106, in which the front of the safety cover rotates upward when the crane lifts the safety hook portion, allowing a worker to access the anchor bolt (tie bolt) and thus detach the anchor bolt to lift the gang form.

[0011] However, during the process of dismantling the aforementioned gang form, there was a problem in that safety accidents occurred, such as workers falling or tripping on the safety platform due to shaking at the moment a worker moved to the safety platform of the cage to detach the anchor bolt. Prior art literature

[0013] Korean Utility Model Publication No. 20-0470106. Anchor bolt locking device for preventing gang form fall (Registration date: November 21, 2013) The problem to be solved

[0014] The purpose of the present invention is to provide a fall prevention safety device for a gang form, which is installed on the front plate of the gang form facing the concrete layer and cured with a spike piece inserted into the top of the concrete layer to prevent the gang form from falling, and allows the gang form to be lifted by separating the spike piece from the concrete layer after the tie bolt is removed during the operation of separating and lifting the gang form after the concrete layer has cured.

[0015] In addition, the present invention aims to provide a fall prevention safety device for a gang form that can improve worker safety by configuring the gang form connected to a crane to be finally dismantled and lifted through the process of a worker separating a spike piece from the concrete layer of a structure.

[0016] In addition, the present invention aims to provide a fall prevention safety device for a gang form that is coupled to the upper side of the front plate of the gang form without interfering with the formation of the outer wall of the structure, allows a spike piece to be inserted and withdrawn as needed to be hooked onto a reinforcing bar structure, and is manufactured with a relatively simple configuration that enables repeated reuse. means of solving the problem

[0018] As an embodiment of the present invention for solving such technical problems, a fall prevention safety device (100) for preventing the fall of a gang form,

[0019] A fixed support member (10) having a fixed support plate (11) attached to the upper side of the front plate (2) of the gang form (1) and a fixed frame (15) formed protruding forward;

[0020] A pull-out frame (20) assembled in the frame insertion opening (16) of the fixed frame (15);

[0021] A slide member (40) is included, which is coupled to the front of the above-mentioned withdrawal frame (20) and has a spike piece (41) formed thereon that is embedded in the concrete layer (5) in the downward direction.

[0022] Additionally, the slide member (40) has an upper cover plate (45a) that is bent upward toward the fixing frame (15) on the spike piece (41) and extended, and a pin insertion hole (47) is formed on one side of the upper cover plate (45a).

[0023] It can be configured to be coupled to a pin fixing hole (23) formed on the upper surface of the pull-out frame (20) and a guide pin (48) by penetrating the slide hole (17) formed on the upper surface of the fixed frame (15).

[0025] In addition, as another embodiment of the present invention, in a fall prevention safety device (100) for preventing the fall of a gang form,

[0026] A fixed support member (10) having a fixed support plate (11) attached to the upper side of the front plate (2) of the gang form (1) and a fixed frame (15) formed protruding forward;

[0027] A spike piece (41) embedded in a concrete layer (5) is disposed in front of the fixed frame (15), and a slide member (40) is formed by extending an upper cover plate (45a) bent in the longitudinal direction of the fixed frame (15) and mutually coupled with the fixed frame (15).

[0029] Additionally, the slide member (40) may be configured such that a gap groove (46) is formed on the lower side of the upper cover plate (45a), and the lower cover plate (45b) is formed in a “C” shape so that the upper plate of the fixed frame (15) is inserted into the gap groove (46), and the slide member (40) is fixed by connecting a guide pin (48) to the pin insertion hole (47) of the lower cover plate (45b) and the upper cover plate (45a) and to the slide hole (17) formed in the fixed frame (15).

[0030] Additionally, the slide hole (17) of the fixed frame (15) is formed in an elongated shape toward the direction of the slide member (40), so that the slide member (40) and the pull-out frame (20), which are joined by a guide pin (48), can be configured to move along the slide hole (17).

[0032] Additionally, the slide member (40) and the fixed support member (10) are each provided with a spring fixing piece (31) on one side where the fixed support plate (11) and the spike piece (41) face each other, and both ends of the return spring (30) are assembled to the spring fixing piece (31), so that when the external force is removed while the slide member (40) is pulled out by an external force, the slide member (40) is automatically retracted by the return elasticity of the return spring (30).

[0034] In addition, a spike fixing pin (21) and a frame fixing hole (43) are formed on the spike piece (41) of the pull-out frame (20) and the slide member (40) so as to correspond to each other on one side facing each other, so that the spike piece (41) can be detachably attached to the front of the pull-out frame (20).

[0036] Additionally, the above-mentioned pull-out frame (20) is provided with a tool fitting part (27) having a concave groove shape on its bottom surface, so that when dismantling the gang form (1), a dismantling tool is inserted into the tool fitting part (27) and vibrated to form a gap between the concrete layer (5) and the spike piece (41).

[0038] Additionally, a single pin through hole (18) is formed in the fixed frame (15), and a plurality of length adjustment holes (25) are formed at regular intervals in the withdrawal frame (20), so that the withdrawal frame (20) can be configured to be fixed by adjusting the length of the extension inserted or withdrawn from the frame insertion opening (16) and then connecting a binding pin (18a) to the pin through hole (18) and the length adjustment hole (25).

[0039] In addition, the spike piece (41) may be configured such that a continuous “~” shaped corrugated portion (42) is formed in the portion embedded in the concrete layer (5), thereby minimizing the friction area with the steel structure (6) that is caught on the spike piece (41). Effects of the invention

[0041] According to the present invention, a spike piece is fixed to the upper side of the front plate of the gang form to prevent the gang form from falling, and in addition, during the lifting and dismantling operation of the gang form, the tie bolt is removed, and as a final step, the worker moves to the concrete layer of the structure to detach the spike piece, thereby enabling the gang form to be lifted after final dismantling, which has the advantage of improving the safety of the worker.

[0042] In addition, by adjusting the extension length of the spike piece according to the steel structure of the formwork so that it is hooked onto and supported by the steel structure, there is an advantage of preventing movement during the concrete pouring process and improving work convenience.

[0043] In addition, it is attached to the upper side of the front plate of the gang form without interfering with the formation of the outer wall of the structure, and allows the spike piece to be inserted and withdrawn as needed to be hooked onto the rebar structure. It also has advantages such as reducing production costs due to its relatively simple configuration and improving marketability through repeated reuse. Brief explanation of the drawing

[0045] FIG. 1 is a combined perspective view of a fall prevention safety device for a gang form according to the present invention. FIG. 2 is an exploded perspective view illustrating the configuration of a first embodiment of a fall prevention safety device for a gang form according to the present invention. FIG. 3 is a cross-sectional view of a state in which a spike piece is fixed to a concrete layer according to the configuration of the first embodiment of the present invention. FIG. 4 is a side cross-sectional view illustrating the state of separating a spike piece fixed to a concrete layer according to the configuration of the first embodiment of the present invention. FIG. 5 is a cross-sectional view of the slide member (40) in a retracted state according to the configuration of the first embodiment of the present invention. FIG. 6 is an exploded perspective view illustrating an embodiment of the use of the present invention. FIG. 7 is an exploded perspective view illustrating the configuration of a second embodiment of the present invention. FIG. 8 is a cross-sectional view illustrating the configuration of a second embodiment of the present invention. Specific details for implementing the invention

[0046] The present invention provides a fall prevention safety device for a gang form that is coupled to the front plate of the gang form and secures a spike piece to the concrete layer curing inside to prevent the gang form from falling. Furthermore, during the lifting and dismantling operations of the gang form, the spike piece is separated from the inside of the structure as a final step before lifting the gang form, thereby enabling the prevention of safety accidents caused by a worker falling.

[0048] The features of the fall prevention safety device for a gang form according to the present invention can be understood through the embodiments described in detail below with reference to the attached drawings.

[0049] The present invention is capable of various modifications and may take various forms, and embodiments are to be described in detail in the text.

[0050] However, this is not intended to limit the invention to the specific disclosed forms, and it should be understood that it includes all modifications, equivalents, and substitutions that fall within the spirit and scope of the invention.

[0052] First, the gang form (1) is configured such that the front plate (2) is connected to a Euroform located on the inner wall of the structure with a plurality of tie bolts to form a formwork for assembling a steel structure (6) on the inside, and a lifting hook that can be transported using a crane is fixedly installed on the gang form frame on the upper rear side. The configuration of the gang form (1) can be applied in various ways according to the requirements of industry professionals, so it is not limited to a specific type.

[0053] The present invention relates to a fall prevention safety device (100) for preventing a worker from falling during the dismantling of the gang form, and as shown in FIGS. 1 to 4, the configuration of the first embodiment mainly includes a fixed support member (10) coupled to a front plate (2), and a slide member (40) having a pull-out frame (20) and a spike piece (41) formed thereon.

[0054] To explain this in more detail, the fixed support member (10) is supported by a fixed support plate (11) on the upper side of the front plate (2) of the gang form (1), so that a connecting screw is fastened to the front plate (2) through screw penetration holes on both sides, or is fastened to a nut member provided on the reinforcing plate on the back side of the gang form (1) by penetrating the front plate, thereby being firmly fixed.

[0055] Additionally, a square pipe-shaped fixed frame (15) is formed protruding forward in the center of the fixed base plate (11), so that the pull-out frame (20) is inserted into the open front frame insertion opening (16).

[0056] The above-mentioned pull-out frame (20) is formed into a square pipe shape smaller than the fixed frame (15) so as to be inserted into the inside through the frame insertion opening (16), and a slide member (40) having a spike piece (41) formed at the front is coupled thereto.

[0057] The above slide member (40) is configured to be integrally coupled to the front of the pull-out frame (20) or to be detachably assembled, and a spike piece (41) is formed that is embedded in the concrete layer (5) in the downward direction.

[0058] The configuration in which the slide member (40) is assembled to the pull-out frame (20) may be such that a spike fixing pin (21) is formed protruding from the front end of the pull-out frame (20), and the spike fixing pin (21) is inserted into the frame fixing hole (43) provided in the spike piece (41) to form an integral connection by welding, or the spike fixing pin (21) may be further extended and the tip penetrating the frame fixing hole (43) is bent outward to form an integral connection, and then, when replacement is required due to damage to the spike piece (41), the bent portion is restored to its original state so that the slide member (40) can be easily separated.

[0059] Here, the slide member (40) is formed such that the upper cover plate (45a), which is bent upward from the upper side of the spike piece (41) toward the upper direction of the fixed frame (15), is further extended, thereby providing a “C” shaped gap groove (46) between the upper surface of the pull-out frame (20) and the upper cover plate (45a), so that the upper plate of the fixed frame (15) can be inserted and supported between the gap groove (46).

[0060] In addition, a pin insertion hole (47) is formed on one side of the upper cover plate (45a), and the upper cover plate (45a) and the upper plate of the pull-out frame (20) are connected by a guide pin (48) that passes through the slide hole (17) formed on the upper surface of the fixed frame (15) and is coupled to the pin fixing hole (23) formed on the upper surface of the pull-out frame (20).

[0062] In addition, as an example of use of the present invention, as shown in FIG. 6, a pin through hole (18) is formed in the side plate of the fixed frame (15), and a plurality of length adjustment holes (25) are formed at regular intervals in the withdrawal frame (20), so that after adjusting the length of the withdrawal frame (20) inserted or withdrawn from the frame insertion opening (16), a binding pin (18a) is coupled to the pin through hole (18) and the length adjustment hole (25), thereby allowing the withdrawal frame (20) to be easily adjusted and fixed to its withdrawal length. This configuration is also included in the present invention.

[0064] In addition, the spike piece (41) of the slide member (40) has a “-” shaped flat plate or a “~” shaped continuous corrugated portion (42) formed in the portion embedded in the concrete layer (5), so that the spike piece (41) is caught on the steel structure (6) installed in the formwork, and the friction area between the steel structure (6) and the corrugated portion (42) is minimized, so that the spike piece (41) can be easily separated from the concrete layer during the lifting operation of the gang form (1) after the concrete layer (5) has cured.

[0065] That is, the fall prevention safety device (100) has a configuration in which a fixed support member (10) is installed at the top of the front plate (2) of the gang form (1) (boundary line with the concrete layer being poured), and an extraction frame (20) and a slide member (40) are combined through the frame insertion opening (16) of the fixed frame (15), and the gang form (1) is supported on the concrete layer (5) by curing with the lower end of a spike piece (41) embedded in the concrete layer (5) being poured at a position lower than the fixed support member (10) of the gang form (1).

[0067] Therefore, in the operation of lifting the gang form (1) after the curing of the concrete layer (5), even if the tie bolt connected to the Euroform is separated from the outer cage of the gang form (1) to form a formwork, the gang form (1) is stably supported by the fall prevention safety device (100), and the worker who separated the tie bolt can safely move to the concrete layer (5), and thereafter, the worker vibrates the spike piece (41) to minimize the friction surface with the buried concrete layer, so that the crane can smoothly lift the gang form.

[0068] At this time, in order to vibrate the spike piece (41), it is preferable to insert a dismantling tool (e.g., a tool that transmits impact or vibration, such as a claw hammer, sledgehammer, or crowbar) into the lower part of one selected from the spike piece, upper cover plate, and pull-out frame as shown in FIG. 4 and vibrate it so that a gap is formed between the concrete layer (5) and the spike piece (41).

[0070] In addition, as shown in FIG. 6, a tool fitting part (27) having a concave groove shape is provided on the bottom surface of the pull-out frame (20) so that a dismantling tool can be easily inserted into the tool fitting part (27) during the dismantling operation of the gang form (1), or a tool fitting groove is further formed on the upper part of the spike piece (41) so that the dismantling tool can be inserted and vibrated.

[0071] In addition, the fall prevention safety device (100) in the present invention is preferably configured so that a slide member (40) can be inserted or withdrawn as shown in FIG. 3 so as to correspond to the thickness of the wall of the structure. To this end, the slide hole (17) of the aforementioned fixed frame (15) is formed into an elongated shape toward the direction of the slide member (40), and the slide member (40) and the withdrawal frame (20), which are joined by a guide pin (48), are assembled so as to be movable along the slide hole (17).

[0072] Here, the slide member (40) and the fixed support member (10) are each provided with a spring fixing piece (31) on one side where the fixed support plate (11) and the spike piece (41) face each other, and both ends of the return spring (30) are assembled to the spring fixing piece (31). When the slide member (40) is pulled out by an external force, the return spring (30) has a tension force, and when the external force is removed, the return spring (30) returns to its initial shape by the tension force as shown in FIG. 5, and the slide member (40) is configured to be automatically retracted.

[0074] Accordingly, the position of the slide member (40) is adjusted in response to the steel structure (6) whose installation position changes according to the wall thickness of the structure, and then the spike piece (41) is hooked onto the steel structure (6) to be supported, thereby preventing the separation of the spike piece (41) and the unintended movement of the slide member (40) even during the concrete pouring process, and thus improving the reliability of the installation work.

[0075] Also, a second embodiment of the present invention can be described with reference to FIGS. 7 and 8, and since the overall configuration is identical and similar to the configuration of the first embodiment described above, a description thereof will be omitted.

[0077] The second embodiment of the fall prevention safety device (100) described above is also included in the present invention in that it is manufactured with simplified components by being composed of a fixed support member (10) that is largely coupled to the upper side of the front plate (2) of the gang form (1) and a slide member (40) that is assembled to the fixed frame (15) of the fixed support member (10).

[0078] The above fixed support member (10) has a configuration in which a fixed support plate (11) is attached to the upper side of the front plate (2) of the gang form (1) and a fixed frame (15) is formed protruding forward. The fixed frame (15) can be provided in the form of a single plate, or can be manufactured in the form of a rectangular pipe with a low vertical height and a frame insertion opening (16) provided at the front.

[0079] Additionally, the slide member (40) is configured such that a spike piece (41) embedded in a concrete layer (5) is positioned in front of the fixed frame (15), and an upper cover plate (45a) bent in the longitudinal direction of the fixed frame (15) is extended and molded to be seated on the upper surface of the fixed frame (15) and joined together.

[0080] Here, the slide member (40) is configured such that a gap groove (46) is formed on the lower side of the upper cover plate (45a), and the lower cover plate (45b) is formed in a “C” shape so that the upper plate of the fixed frame (15) is inserted into the gap groove (46); and the slide member (40) is configured to be fixed to the fixed frame (15) by connecting a guide pin (48) to the pin insertion hole (47) of the lower cover plate (45b) and the upper cover plate (45a) and to the slide hole (17) formed in the fixed frame (15).

[0081] In addition, the slide hole (17) formed in the upper plate of the fixed frame (15) is formed into an elongated hole, and the spring fixing piece (31) is provided on the fixed base plate (11) and the spike piece (41) to connect the return spring (30) so that the slide member (40) can be configured to be able to be pulled out and moved in.

[0083] As described above, in the operation to lift a gang form (1) installed for the construction of the outer wall of a structure according to an embodiment of the present invention, the crane hook is fixed to the lifting hook, and even if a worker separates the tie bolt from the outside of the cage and moves to the inside of the structure, the spike piece (41) at the top of the gang form (1) is embedded in the concrete layer (5), so that the gang form (1) can be maintained in a fixed state. By configuring the crane to lift the gang form after the worker who has moved to the concrete layer (5) vibrates the spike piece (41), effects such as preventing damage to the concrete layer (5) and preventing the worker from falling or safety accidents are achieved.

[0085] As described above, the embodiments explained are the most preferred examples of the present invention, but are not limited to the above embodiments. It is obvious to those skilled in the art that various modifications are possible within the scope of the technical spirit of the present invention. Explanation of the symbols

[0086] 10. Fixed support member 15. Fixed frame 17. Slide hole 18. Pin through hole 20. Pull-out frame 21. Spike fixing pin 23. Pin fixing hole 25. Length adjustment hole 30. Return spring 31. Spring fixing piece 40. Slide member 41. Spike piece 42. Bellows 43. Frame fixing hole 45a. Upper cover plate 45b. Lower cover plate 46. ​​Spacing groove 47. Pin insertion hole 48. Guide pin 100. Fall prevention safety device

Claims

Claim 1 A fall prevention safety device (100) for preventing a gang form from falling comprises: a fixing support member (10) in which a fixing support plate (11) is coupled to the upper side of the front plate (2) of the gang form (1) and a fixing frame (15) is formed protruding forward; a pull-out frame (20) assembled to the frame insertion opening (16) of the fixing frame (15); and a slide member (40) in which a spike piece (41) is formed and coupled to the front of the pull-out frame (20) and embedded in the concrete layer (5) in the downward direction. The slide member (40) is formed such that an upper cover plate (45a) bent in the upper direction of the fixing frame (15) is extended and molded on one side of the upper cover plate (45a), and a pin insertion hole (47) is formed through the slide hole (17) formed on the upper surface of the fixing frame (15) and a pin fixing hole (23) formed on the upper surface of the pull-out frame (20). A fall prevention safety device for a gang form, characterized by being connected by a guide pin (48). Claim 2 A fall prevention safety device (100) for preventing a gang form from falling, comprising: a fixing support plate (11) formed on the upper side of the front plate (2) of the gang form (1) and a fixing frame (15) formed protruding forward; a slide member (40) in which a spike piece (41) embedded in a concrete layer (5) is arranged in front of the fixing frame (15) and an upper cover plate (45a) bent in the longitudinal direction of the fixing frame (15) is extended and formed to be mutually coupled with the fixing frame (15); wherein the spike piece (41) has a continuous "~" shape formed in a corrugated portion (42) at the portion embedded in the concrete layer (5), so as to minimize the friction area with the steel structure (6) that is caught on the spike piece (41). Claim 3 A fall prevention safety device for a gang form according to claim 2, wherein the slide member (40) is configured such that a gap groove (46) is formed on the lower side of the upper cover plate (45a) and the lower cover plate (45b) is formed in a "C" shape so that the upper plate of the fixed frame (15) is inserted into the gap groove (46), and a guide pin (48) is coupled to the pin insertion hole (47) of the lower cover plate (45b) and the upper cover plate (45a) and the slide hole (17) formed in the fixed frame (15) so that the slide member (40) is fixed. Claim 4 A fall prevention safety device for a gang form according to claim 1, wherein the slide hole (17) of the fixed frame (15) is formed in an elongated shape toward the direction of the slide member (40), and the pull-out frame (20) and the slide member (40) coupled by a guide pin (48) are configured to move along the slide hole (17). Claim 5 A fall prevention safety device for a gang form according to claim 2, wherein the slide hole (17) of the fixed frame (15) is formed in an elongated shape toward the direction of the slide member (40), and the slide member (40) coupled by a guide pin (48) is configured to move along the slide hole (17). Claim 6 A fall prevention safety device for a gang form according to claim 1 or 2, wherein the slide member (40) and the fixed support member (10) each have a spring fixing piece (31) on one surface where the fixed support plate (11) and the spike piece (41) face each other, and both ends of a return spring (30) are assembled to the spring fixing piece (31), so that when the external force is removed while the slide member (40) is pulled out by an external force, the slide member (40) is automatically retracted by the return elasticity of the return spring (30). Claim 7 A fall prevention safety device for a gang form, characterized in that, in the first paragraph, a spike fixing pin (21) and a frame fixing hole (43) are formed on mutually facing surfaces of the spike piece (41) of the pull-out frame (20) and the slide member (40) so as to be detachably attached to the front of the pull-out frame (20). Claim 8 A fall prevention safety device for a gang form according to claim 1, wherein the pull-out frame (20) is provided with a tool fitting part (27) having a concave groove shape on its bottom surface, and configured such that when dismantling the gang form (1), a dismantling tool is inserted into the tool fitting part (27) and vibrated to form a gap between the concrete layer (5) and the spike piece (41). Claim 9 A fall prevention safety device for a gang form, characterized in that, in the first paragraph, a single pin through hole (18) is formed in the fixed frame (15), and a plurality of length adjustment holes (25) are formed at regular intervals in the withdrawal frame (20), so that the withdrawal frame (20) is fixed by adjusting the length of the withdrawal frame (20) inserted or withdrawn from the frame insertion opening (16) and then connecting a binding pin (18a) to the pin through hole (18) and the length adjustment hole (25). Claim 10 A fall prevention safety device for a gang form, characterized in that, in the first paragraph, the spike piece (41) has a continuous “~” shaped corrugated portion (42) formed in the portion embedded in the concrete layer (5), thereby minimizing the friction area with the steel structure (6) that is caught on the spike piece (41).

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