KR102132854B1 - Cable tray and assembling method thereof - Google Patents

Abstract

The present invention relates to a cable tray and a method of assembling the same, which can simplify the manufacturing process while securing the overall rigidity and bonding strength of the components. According to embodiments of the present invention, a cable tray, which is provided to enable a bundle in which cables are arranged to be placed, includes: a pair of guardrail beams arranged in parallel to block both sides of the cable bundle in the width direction and having a certain length, a certain width and a certain height; and a plurality of rung beams provided between the pair of guard rail beams to connect the pair of guard rail beams, having a constant length, a constant width and a constant height, and arranged to support the cable bundle. A method of assembling a cable tray which assembles a pair of guardrail beams arranged in parallel to block both sides of the cable bundle in the width direction and a plurality of rung beams arranged to support the cable bundle includes connecting one end of the rung beam to an inner surface of one of the pair of guardrail beams and inserting each part of one end and an opposite end of the rung beam downward into the guard rail beam so that the opposite end of the rung beam is connected to the inner surface of the other of the pair of guard rail beams.

Description

Cable tray and its assembly method{CABLE TRAY AND ASSEMBLING METHOD THEREOF}

The present invention relates to a cable tray and a method for assembling the same, and more particularly, to a cable tray and a method for assembling the method, while the overall rigidity and the combined strength of components are guaranteed.

In general, a cable tray (cable tray) refers to a facility for arranging cables for energizing or communicating in buildings, ships, and railroad vehicles without interference from other equipment that may become obstacles.

That is, the cable tray is a device for protecting a cable, and a bundle in which various cables are arranged is mounted on the cable tray. An example of the cable tray is a cable that connects the same structure as a pair of guard rails and the same structure as the pair of guard rails that extends in the longitudinal direction of the cable to be arranged and blocks both sides of the cable in the width direction. There is a structure composed of a plurality of rung-like structures supporting the lower end of the arrayed bundle, and a cable tray having such a configuration is widely used.

Conventionally, a method such as welding or bolting has been used to connect the rung-like structure to the guardrail-like structure.

However, daily welding or bolting to the structures such as the plurality of rungs may complicate the manufacturing process, increase the number of labors, and increase the possibility of defects. In addition, the bonding strength is not uniform by the process including welding, which may be disadvantageous in terms of overall rigidity of the cable tray.

Republic of Korea Registered Patent Publication No. 10-0816295

Accordingly, the present invention was created to solve the above problems, and an object of the present invention is to provide a cable tray and a method for assembling the same, which can simplify the manufacturing process while securing the combined rigidity of the overall rigidity and components.

The cable tray according to the embodiments of the present invention for achieving this object may be a cable tray provided so that a bundle in which cables are arranged is seated.

A cable tray according to embodiments of the present invention includes a pair of guardrail beams arranged in parallel to block both sides in the width direction of the cable bundle, and having a constant length, a constant width, and a constant height; A plurality of rung beams connecting the pair of guardrail beams between the pair of guardrail beams, having a constant length, a constant width, and a constant height, and arranged to support the cable bundle. have.

The longitudinal direction of the guardrail beam is the same as the longitudinal direction of the cable bundle, and one end in the longitudinal direction of the rung beam is connected to an inner surface of one of the pair of guardrail beams, and the other end in the longitudinal direction of the rung beam is the One of the pair of guardrail beams is connected to the inner surface of the other, and the rung beam may be coupled by inserting each portion of one end and the other end in the longitudinal direction downward into the guardrail beam.

The length direction of the rung beam and the length direction of the guardrail beam may be orthogonal.

The plurality of rung beams may be arranged at equal intervals.

The rung beam includes: a rung upper surface that is an upper side surface supporting the bundle of cables; And a guardrail coupling portion formed at one end and the other end in the longitudinal direction so as to be combined with the guardrail beam.

The guard rail coupling portion, upward bending portion extending bent upward from the rung upper surface; A downward bending portion that is bent downward and extends while forming a curved surface from the extended upward bending portion; And an inner protrusion protruding inward from the downward bending part.

The guardrail beam may include a plurality of rung coupling portions formed along a longitudinal direction so as to be arranged at a position corresponding to the rung beam.

The rung engaging portion, the engaging projection protruding inward from the inner surface to have a cross section of the "U" shape opened outward along the height direction; It may include; as the hollow of the "U" shaped coupling protrusion, the downward bending portion is inserted downwardly.

The rung coupling portion, as a part of the lower portion of the coupling protrusion, may further include a locking jaw functioning to engage the inner protrusion when the downward bending portion attempts to detach upward from the insertion hole in a state where insertion is completed.

The rung engaging portion is recessed inward from the outer surface of the engaging projection, and when the inner projecting portion is seated in the state in which the downward bending portion is inserted, the downward bending portion tries to escape upward from the insertion hole, the inner projecting portion is caught. It may further include a locking groove to function.

The upward bending portion is formed to be inclined to extend outward while extending upward, and the downward bending portion can be extended in a vertical direction without inclination.

The inner protrusion may be formed by pressing the outer side of the downward bending portion to deform a portion of the downward bending portion.

The guardrail coupling portion further includes a receiving hole recessed inward from the outer surface of the downward bending portion at the lower side of the inner protrusion portion, and the rung coupling portion protrudes inward from the inner surface of the guardrail beam at the lower side of the coupling protrusion portion. It may further include a receiving projection.

When the receiving projection is seated in the receiving hole in the state in which the downward bending portion is inserted, when the downward bending portion tries to escape upward from the insertion hole, the receiving projection may be caught in the receiving hole.

The rung beam is formed to have a cross section of a "U" shape opened downward along the longitudinal direction, and the top surface of the rung may be an upper side of the "U" shape opened downward.

The rung beam includes a pair of rung sides arranged in parallel as both sides in the width direction in a “U” shape opened downward; An outward extension extending from the one end and the other end in the longitudinal direction of the rung side to the same plane as the plane in which the downward bending portion is disposed based on the longitudinal direction from the rung side; And a cutout that is a space formed between the guardrail engaging portion and the outwardly extending portion.

The pair of guardrail beams are each formed to have a cross section of an "U" shape opened inward, and in the state in which the downward bending part is inserted into the insertion hole, the lower end of the lower bending part and the lower end of the rung side At least one of the guardrail beams may be in contact with the lower side in the “U” shape.

The plurality of rung coupling parts may have the same phase based on the height direction.

The lower end of the engaging projection may have a shape recessed upward so that the engaging jaw is disposed above the lowermost end of the engaging projection.

The thickness of the guard rail beam width direction of the inner protrusion may be partially greater than the uniform width of the guard rail beam width of the insertion hole.

A force is applied downward to the rung beam so that the lower end of the downward bending portion passes through the insertion inlet, which is the portion surrounding the upper end of the coupling protrusion of the insertion hole, so that the lower end of the downward bending portion is coupled to the insertion hole while elastically deforming the coupling protrusion. It can be moved to a position where insertion of the downward bending part is completed through an insertion exit, which is a portion surrounded by a lower end of the protrusion.

The cross section in the width direction of the rung beam of the inner protrusion may gradually decrease as it goes downward.

In the state in which the downward bending part is inserted into the insertion hole, the lower end of the upper surface of the rung may contact the coupling protrusion.

The rung engaging portion exposes the engaging projection to the outside so that additional work for reinforcing the bonding strength of the guardrail engaging portion and the rung engaging portion can be performed as necessary, and the working hole drilled in the width direction of the guardrail beam. It may further include.

The rung coupling portion may further include a pressing protrusion that protrudes inward from the inner surface of the guardrail beam from the lower side of the coupling protrusion and presses the outer surface of the downward bending portion in a state in which the downward bending portion is inserted into the insertion hole. have.

The pressing protrusion may be a circular protrusion formed in a shape that is a part of the sphere.

A force is applied downward to the rung beam after the lower end of the downward bending portion sequentially passes through the insertion inlet, which is the part of the upper end of the engaging projection of the insertion hole, and the insertion outlet, which is the lower end of the engaging projection of the insertion hole. As the coupling protrusion is elastically deformed, the pressing protrusion may be moved to a position pressing the outer surface of the downward bending portion.

The receiving projection may be formed by pressing the outside of the guardrail beam to deform a portion of the guardrail beam.

The rung beam includes: a rung upper surface that is an upper side surface supporting the bundle of cables; And

It may include; a guardrail coupling portion formed at one end and the other end in the longitudinal direction so as to be combined with the guardrail beam.

The guard rail coupling portion, the downward bending portion extending in the vertical direction bent downward from the upper surface of the rung; A first accommodating hole recessed inward from an outer surface of the downward bending portion; And a second accommodating hole recessed outward from an inner surface of the downward bending part at an upper side than the first accommodating hole.

The guardrail beam includes a plurality of rung coupling portions formed along a longitudinal direction so as to be arranged at positions corresponding to the rung beams, and the rung coupling portion is shaped like a “U” shaped to open outward along a height direction. A coupling protrusion protruding inward from the inner surface to have a cross section of; As the hollow of the "U" shaped coupling projection, the downward bending portion is inserted into the insertion hole; A first receiving protrusion protruding inward from an inner surface of the guardrail beam at a lower side of the engaging protrusion; And a second receiving protrusion protruding outward from the outer surface of the engaging protrusion.

In the state in which the downward bending portion is inserted, the first receiving protrusion is seated in the first receiving hole, and the second receiving protrusion is seated in the second receiving hole so that the downward bending part is separated from the insertion hole upward. When the first receiving protrusion is caught in the first receiving hole, the second receiving protrusion may be caught in the second receiving hole.

The rung beam is formed to have a cross section of a "U" shape opened downward along the longitudinal direction, and the top surface of the rung may be an upper side of the "U" shape opened downward.

The rung beam includes a pair of rung sides arranged in parallel as both sides in the width direction in a “U” shape opened downward; An outward extension extending from the one end and the other end in the longitudinal direction of the rung side to the same plane as the plane in which the downward bending portion is disposed based on the longitudinal direction from the rung side; And a cutout that is a space formed between the guardrail engaging portion and the outwardly extending portion.

The pair of guardrail beams are each formed to have a cross section of an "U" shape opened inward, and in the state in which the downward bending part is inserted into the insertion hole, the lower end of the lower bending part and the lower end of the rung side At least one of the guardrail beams may be in contact with the lower side in the “U” shape.

The plurality of rung coupling parts may have the same phase based on the height direction.

In the state in which the downward bending part is inserted into the insertion hole, the lower end of the upper surface of the rung may contact the coupling protrusion.

The rung engaging portion exposes the engaging projection to the outside so that additional work for reinforcing the bonding strength of the guardrail engaging portion and the rung engaging portion can be performed as necessary, and the working hole drilled in the width direction of the guardrail beam. It may further include.

The first accommodating protrusion is formed by depressing a part of the guardrail beam by pressing the outside of the guardrail beam, and the second accommodating protrusion is formed by depressing a part of the coupling protrusion by pressing the inside of the coupling protrusion. Can be.

The first receiving hole and the second receiving hole may be perforated in the downward bending portion.

Method for assembling a cable tray according to embodiments of the present invention, assembling a pair of guardrail beams arranged in parallel to block both sides in the width direction of the cable bundle and a plurality of rung beams arranged to support the cable bundle It may be a method of assembling the cable tray.

The rung beam has one end and the other end so that one end of the rung beam is connected to an inner surface of one of the pair of guardrail beams, and the other end of the rung beam is connected to an inner surface of the other of the pair of guardrail beams. Each part may be performed by being inserted downward in the guardrail beam.

The rung beam including an upper side of the rung upper surface, an upward bending portion extending from the upper end of the rung and extending upwardly at one end and the other end, and a downward bending portion extending downward from the extended upward bending portion. , The downward bending portion to the guardrail beam including a coupling protrusion protruding from an inner surface to have a cross section of an “U” shape opened outward, and a hollow insertion hole of the “U” shape coupling protrusion. It can be combined by being inserted downward into the insertion hole.

When the rung beam further comprising an inner protrusion protruding inward from the downward bending part attempts to deviate upward in a state in which the downward bending part is inserted, the inner protrusion may be caught in a part of the coupling protrusion.

When the downward bending portion in which the inner protrusion having a thickness partially greater than the width of the insertion hole is inserted into the insertion hole, a downward force is applied to the rung beam so that the coupling protrusion is elastically deformed and insertion of the downward bending portion is completed. Can be.

As the thickness of the inner protrusion gradually decreases as it goes downward, the coupling protrusion is easily elastically deformed and insertion of the downward bending part can be completed.

The rung beam further comprising a first receiving hole perforated in the downward bending portion and a second receiving hole perforated in the downward bending portion at an upper side than the first receiving hole, upward while the insertion of the downward bending portion is completed. When attempting to escape, the first receiving hole is caught by the first receiving projection protruding inward from the inner surface of the guardrail beam from the lower side of the engaging projection, and the second receiving hole protruding outward from the outer surface of the engaging projection You may get a second receptive process.

When the downward bending portion is inserted into the insertion hole, a force is applied downward to the rung beam so that the first receiving projection and the second receiving projection are elastically deformed, so that the insertion of the downward bending portion can be completed.

In the guardrail beam, a work hole is drilled in the width direction of the guardrail beam so that the engaging projection is exposed to the outside, and additional work is needed to reinforce the bonding strength of the guardrail beam and the rung beam through the work hole. It can be performed according to.

As described above, according to the embodiment of the present invention, the welding process, and without bolting, the guardrail beam and the rung beam are combined while the bonding strength is secured, thereby simplifying the manufacturing process, reducing manpower, and reducing the possibility of defects. Can.

In addition, by eliminating the process including welding, the bonding strength of the guardrail beam and the rung beam is uniform, and ultimately, the overall rigidity of the cable tray can be improved.

1 is a perspective view of a cable tray according to an embodiment of the present invention.
2 is an exploded view of a portion of a cable tray according to an embodiment of the present invention.
3 is a top perspective view of a rung beam of a cable tray according to an embodiment of the present invention.
4 is a bottom perspective view of a rung beam of a cable tray according to an embodiment of the present invention.
5 is a partially enlarged view of the inside of the guardrail beam of the cable tray according to the embodiment of the present invention.
6 is a partially enlarged view of the outside of the guardrail beam of the cable tray according to the embodiment of the present invention.
7 is a cross-sectional view showing a state where a guardrail beam and a rung beam of a cable tray according to an embodiment of the present invention are combined.
8 is an inner perspective view showing a state where a guardrail beam and a rung beam of a cable tray according to an embodiment of the present invention are combined.
9 is a partially enlarged view of a rung beam of a cable tray according to another embodiment of the present invention.
10 is a partially enlarged view of the outside of the guardrail beam of the cable tray according to another embodiment of the present invention.
11 is a partially enlarged view inside the guardrail beam of the cable tray according to another embodiment of the present invention.
12 is a partially enlarged view of a section showing a state in which a guardrail beam and a rung beam of a cable tray are combined according to another embodiment of the present invention.
13 is a partially enlarged view of a rung beam of a cable tray according to another embodiment of the present invention.
14 is a partially enlarged view of the outside of the guardrail beam of the cable tray according to another embodiment of the present invention.
15 is a partially enlarged view of the inside of the guardrail beam of the cable tray according to another embodiment of the present invention.
16 is a partially enlarged view of a cross section showing a state in which a guardrail beam and a rung beam of a cable tray are combined according to another embodiment of the present invention.

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

1 is a perspective view of a cable tray according to an embodiment of the present invention.

1, the cable tray 10 according to the embodiment of the present invention includes a guardrail beam 12 and a rung beam 14.

The cable tray 10 is a device for protecting a cable, and is provided so that a bundle in which various cables are arranged is seated. Meanwhile, the cable tray 10 may be fixed to a basic support such as a wall of a building, a ship's hull, and a railroad car chassis so that it can be installed at a desired height by being spaced from the floor without interference with other equipment. Since the basic function of the cable tray 10 and the structural concept for implementing the function are obvious to those skilled in the art (hereinafter, those skilled in the art), detailed descriptions thereof will be omitted.

The guard rail beam (12, guard rail beam) is composed of a pair arranged in parallel so as to block both sides in the width direction of the cable bundle. Further, the guardrail beam 12 is formed in a beam shape having a constant length, a constant width in a direction perpendicular to the longitudinal direction, and a constant height in a direction perpendicular to the longitudinal direction and the width direction. In the drawing, the pair of guardrail beams 12 are shown to be formed so as to have cross sections of a “U” shape opened in opposite directions along the length direction, but are not limited thereto. On the other hand, as will be apparent to those skilled in the art, the guardrail beam 12 is formed to have a “U” shaped cross-section to increase flexural rigidity. Here, the direction in which the pair of guardrail beams 12 face each other is defined as the inside, and the opposite direction is defined as the outside, and the same applies in the following description.

The rung beam 14 is orthogonal to the guardrail beam 12 to connect the pair of guardrail beams 12 between the pair of guardrail beams 12. However, one inner surface of the pair of guardrail beams 12 and one end in the longitudinal direction of the rung beam 14 are combined, and the other inner surface of the pair of guardrail beams 12 and the rung beam If the other end of the lengthwise direction of (14) is combined so that the rung beam 14 functions to connect the pair of guardrail beams 12, the arrangement of the rung beams 14 is arranged according to the design of a person skilled in the art. It is not limited to orthogonal to the beam 12. Further, the rung beam 14 is formed in a beam shape having a constant length, a constant width in a direction perpendicular to the longitudinal direction, and a constant height in a direction perpendicular to the longitudinal direction and the width direction. That is, that the rung beam 14 is orthogonal to the guardrail beam 12 means that the longitudinal direction of the rung beam 14 is perpendicular to the longitudinal direction of the guardrail beam 12. Further, the rung beam 14 is composed of a plurality of cables arranged side by side along the longitudinal direction of the cable bundle, and the cable bundle is seated on the plurality of rung beams 14. On the other hand, the plurality of rung beams 14 may be preferably arranged at equal intervals. Here, it is obvious to those skilled in the art that the rung beam 14 offsets the weight of the cable bundle against the vertical direction, so that it is obvious to those skilled in the art that the guardrail beam 12 and the rung beam 14 have an upper and lower direction. Will be omitted.

2 is an exploded view of a portion of a cable tray according to an embodiment of the present invention. In addition, FIG. 2 shows that one of the plurality of rung beams 14 is separated from the pair of guardrail beams 12.

As shown in FIG. 2, the rung beam 14 is moved downward from the upper side of the guardrail beam 12 such that each part of the longitudinal end and the other end is inserted downward into the guardrail beam 12. Combined.

Hereinafter, a configuration for implementing the combination of the rung beam 14 and the guardrail beam 12 will be described with reference to FIGS. 3 to 8.

3 is an upper perspective view of a rung beam of a cable tray according to an embodiment of the present invention, and FIG. 4 is a lower perspective view of a rung beam of a cable tray according to an embodiment of the present invention.

3 and 4, the rung beam 14 includes a rung top surface 410, a rung side 420, and an incision 430.

The rung top surface 410 is an upper side of the rung beam 14 formed in a beam shape, and supports the cable bundle. In the drawing, the plurality of rung beams 14 are respectively formed to have a uniform “U”-shaped cross section opened downward along the longitudinal direction, but are not limited thereto. On the other hand, it is of course that the rung beam 14 is formed to have a “U”-shaped cross-section to increase bending strength, and to increase the bonding strength with the guardrail beam 12. In other words, when the rung beam 14 has a “U” shape, the rung upper surface 410 has the uniform rung beam 14 having a uniform “U”-shaped cross section opened downward along the longitudinal direction. Is the upper side. In addition, the rung upper surface 410 forms a guardrail engaging portion 412 coupled to the guardrail beam 12 at one end and the other end in the longitudinal direction of the rung beam 14, respectively. Furthermore, the guardrail coupling part 412 includes an upward bending part 414, a downward bending part 416, and an inner protrusion 418.

The upward bending portion 414 is bent upward from the uniform rung upper surface 410 and extended. In addition, the upward bending portion 414 may be formed to be inclined to extend outward while extending upward.

The downward bending portion 416 extends by bending downward while forming a curved surface from the extended upward bending portion 414. In addition, the downward bending portion 416 extends in a vertical direction without inclination.

The inner projection 418 is formed in the downward bending portion 416 to protrude inward. In addition, the inner protrusion 418 may be formed in the central portion of the downward bending portion 416 when viewed in the longitudinal direction of the rung beam 14, but is not limited thereto. Further, the inner protrusion 418 may be formed by pressing a portion of the downward bending portion 416 by processing such as notching to deform a portion of the downward bending portion 416.

The rung side surface 420 is a widthwise both side surface of the rung beam 14 having a uniform “U” shaped cross section opened downward along the longitudinal direction. That is, the rung side 420 is composed of a pair arranged in parallel. Here, it goes without saying that the pair of rung side surfaces 420 is bent downward from both ends of the rung beam 14 in the width direction of the upper rung surface 410. Further, the rung side surface 420 forms an outwardly extending portion 422 at one end and the other end in the longitudinal direction of the rung beam 14, respectively. Furthermore, the outwardly extending portion 422 extends from the uniform rung side 420 to the downward bending portion 416 based on the longitudinal direction of the rung beam 14. In other words, the outwardly extending portion 422 extends outwardly to the same plane as the plane in which the downward bending portion 416 is disposed based on the longitudinal direction of the rung beam 14.

The incision portion 430 is a space formed between the guardrail coupling portion 412 and the outwardly extending portion 422. From this point of view, the rung beam 14 has a constant length, a constant width, and a constant height except for the one end portion and the other end portion in the longitudinal direction, and the curved surface after the upper surface is bent upward and extended at the one end and the other end in the longitudinal direction. While forming the bent downward, the longitudinal end and the other end of the rung beam 14 are formed in such a way that they are formed to have a shape extending to close one end in the longitudinal direction and the other end and a closed shape in both width directions. By being cut so as to be formed, the guardrail engaging portion 412 and the outwardly extending portion 422 may be formed spaced apart.

5 is a partially enlarged view of the inside of the guardrail beam of the cable tray according to an embodiment of the present invention, and FIG. 6 is a partially enlarged view of the outside of the guardrail beam of the cable tray according to an embodiment of the present invention. A cross-sectional view showing a state where the guardrail beam and the rung beam of the cable tray according to the embodiment of the invention are combined, and FIG. 8 is an inner side showing the state where the guardrail beam and the rung beam of the cable tray according to the embodiment of the present invention are combined It is a perspective view.

5 to 8, the guardrail beam 12 includes a rung coupling portion 212.

A plurality of the rung coupling parts 212 are formed at positions corresponding to the rung beams 14 along the length direction of the pair of guardrail beams 12. That is, if the plurality of rung beams 14 are arranged at equal intervals, the plurality of rung coupling parts 212 are formed to be arranged at equal intervals. In addition, the plurality of rung coupling parts 212 have the same phase based on the height direction of the guardrail beam 12. In other words, the rung coupling portion 212 is formed in a part based on the height direction of the guardrail beam 12. Further, the rung coupling portion 212 includes a coupling protrusion 214, an insertion hole 216, a locking jaw 218 and a pressing protrusion 219.

The engaging projection 214 is formed to have an “U” shaped cross-section projecting inward from the inner surface of the guardrail beam 12 and opening outward along the height direction of the guardrail beam 12.

The insertion hole 216 is hollow of the "U" shaped coupling protrusion 214. In addition, the guard rail beam 12 and the rung beam 14 are coupled by inserting the downward bending part 416 into the insertion hole 216. That is, the downward bending portion 416 is applied to the rung beam 14 in the state in which the insertion is completed in the insertion hole 216, so as to prevent departure from the insertion hole 216 inward. Engaged in the engaging projection 214. In other words, the engaging protrusion 214 limits the clearance in the width direction of the guardrail beam 12 of the rung beam 14. For convenience of description, a portion surrounded by the upper end of the engaging projection 214 of the insertion hole 216 is referred to as an insertion inlet 216a, and a portion surrounded by a lower end of the engaging projection 214 of the insertion hole 216 is surrounded. It will be referred to as an insertion outlet 216b.

The engaging jaw 218 functions as a part of the lower end of the engaging projection 214 to engage the inner projection 418 of the downward bending portion 416 inserted into the insertion hole 216. That is, when an upward force is applied to the rung beam 14 in a state in which the downward bending portion 416 is inserted into the insertion hole 216, the inner protrusion 418 is the downward bending portion 416 Is caught on the locking jaw 218 so as to be prevented from escaping upward from the insertion hole 216. In other words, the locking jaw 218 limits the clearance in the height direction of the guardrail beam 12 of the rung beam 14. In addition, the locking jaw 218 may be disposed in a recessed position upward from the lowest end of the engaging projection 214 surrounding the insertion outlet 216b. That is, the lower end of the engaging projection 214 may have a shape recessed upward to form the locking jaw 218.

The pressing protrusion 219 protrudes inward from the inner surface of the guardrail beam 12 from the lower side of the engaging protrusion 214. In addition, the pressing protrusion 219 functions to press the outer surface of the downward bending portion 416 in a state in which the downward bending portion 416 is inserted into the insertion hole 216. Therefore, the downward bending portion 416 is firmly fixed to the insertion hole 216.

Meanwhile, the thickness of the guardrail beam 12 in the width direction of the inner protrusion 418 may be partially greater than the width of the guardrail beam 12 in the width direction of the insertion hole 216. Here, the thickness in the width direction of the guardrail beam 12 of the inner protrusion 418 is a thickness including up to the thickness of the downward bending portion 416.

In this aspect, when the downward bending portion 416 is inserted into the insertion hole 216, the lower portion of the downward bending portion 416 because the engaging projection 214 prevents the inner projection 418 from entering. It may be difficult without the force required to move to the position where the insertion of the downward bending part 416 is completed while sequentially passing through the insertion inlet 216a and the insertion outlet 216b. In other words, in order for the inner protrusion 418 blocked by the engaging protrusion 214 to move downward, the required force such that the engaging protrusion 214 is elastically deformed must be applied downward to the rung beam 14. do. Here, in order to facilitate elastic deformation of the coupling protrusion 214, the cross-section of the rung beam 14 in the width of the inner protrusion 418 may be preferably formed in a shape that gradually decreases toward downward.

Meanwhile, the pressing protrusion 219 may be a circular protrusion formed in a shape that is a part of a sphere.

From this point of view, when the lower end of the downward bending portion 416 sequentially passes through the insertion inlet 216a and the insertion outlet 216b, and moves to a position where the insertion of the downward bending portion 416 is completed, the In order for the inner projection 418 blocked by the engaging projection 214 to move downward, the required force such that the engaging projection 214 is elastically deformed is applied to the rung beam 14 downward and at the same time, the downward movement. The lower end of the bending portion 416 passes through the pressing protrusion 219 and is moved downward to the rung beam 14 to move to a position where the pressing protrusion 219 presses the outer surface of the downward bending portion 416. The required force must be applied. Here, since the pressing protrusion 219 is formed in a shape that is a part of the sphere, insertion of the downward bending portion 416 can be easily completed without requiring a large downward force on the rung beam 14.

On the other hand, in the state in which the insertion of the downward bending portion 416 into the insertion hole 216 is completed, the lower end of the downward bending portion 416 by the "U" shape opened inside the guardrail beam 12 And at least one of the lower ends of the rung side surface 420 is in contact with the lower side of the guardrail beam 12, or the lower end of the upper rung surface 410 is in contact with the coupling protrusion 214, the cable tray 10 ), the overall stiffness can be reinforced.

The rung coupling portion 212 further includes a work hole 220.

The work hole 220 is formed in the guardrail beam 12 so that the coupling protrusion 214 is exposed to the outside. That is, the work hole 220 is perforated in the width direction of the guardrail beam 12. Here, it is obvious that the working hole 220 communicates with the insertion hole 216. The rung beam 14 according to an embodiment of the present invention can be combined with the guardrail beam 12 without welding or bolting, and the guardrail beam of the rung beam 14 12) Since the clearance in the width direction and the height direction is limited, the coupling strength between the rung beam 14 and the guardrail beam 12 is secured. However, the work hole 220 so that welding or bolting of the guardrail coupling portion 412 of the rung beam 14 and the rung coupling portion 212 of the guardrail beam 12 may be performed as required. Can be provided. Here, the rung coupling portion 212 including the work hole 220 is formed at a position where the fracture stress of the guardrail beam 12 due to the load transmitted through the rung beam 14 is considered.

Hereinafter, a configuration for implementing the combination of the rung beam 14 and the guardrail beam 12 according to another embodiment of the present invention will be described with reference to FIGS. 9 to 12. Here, since the basic configuration and functions of the guardrail beam 12 and the rung beam 14 according to the embodiment of the present invention described with reference to FIGS. 1 and 2 are the same as other embodiments of the present invention, it is repeated. The description of phosphorus will be omitted.

9 is a partially enlarged view of a rung beam of a cable tray according to another embodiment of the present invention.

As shown in Figure 9, the rung beam 14 according to another embodiment of the present invention is compared to the guardrail engaging portion 412 according to an embodiment of the present invention, the position of the inner protrusion 418 is changed, The first accommodation hole 419 is further included. For convenience of description, the inner protrusion 418a formed in the guardrail engaging portion 412 according to another embodiment of the present invention is different from the inner protrusion 418 formed in the guardrail engaging portion 412 according to an embodiment of the present invention. It will be described with reference numerals. On the other hand, repeated description of the same configuration as the embodiment of the present invention, except for the first accommodating hole 419 and the inner protruding portion 418a in which the position is changed will be omitted.

The inner protruding portion 418a is formed in the downward bending portion 416 to protrude inward. In addition, the inner protrusion 418a may be formed by pressing a portion of the downward bending portion 416 by processing such as notching to deform a portion of the downward bending portion 416. Furthermore, the inner projection 418a may be formed in the central portion of the downward bending portion 416 when viewed in the longitudinal direction of the rung beam 14, but the inner projection 418 according to the embodiment of the present invention ). This is to secure a space in which the first receiving hole 419 is formed.

The first receiving hole 419 is formed in the downward bending portion 416 to be recessed inward from the outer surface of the downward bending portion 416. In addition, the first receiving hole 419 may be formed in the central portion of the downward bending portion 416 when viewed in the longitudinal direction of the rung beam 14, but formed below the inner protrusion 418a. do. In FIG. 9, the first receiving hole 419 is illustrated by being drilled through the downward bending portion 416, but is not limited thereto.

10 is a partially enlarged view of the outside of the guardrail beam of the cable tray according to another embodiment of the present invention, and FIG. 11 is a partially enlarged view of the inside of the guardrail beam of the cable tray according to another embodiment of the present invention. Is a partially enlarged view of a cross-section showing a state where a guardrail beam and a rung beam of a cable tray according to another embodiment of the present invention are combined.

10 to 12, the rung engaging portion 212 according to another embodiment of the present invention is compared with the rung engaging portion 212 according to an embodiment of the present invention, the pressing protrusion 219 is deleted , The function of the locking jaw 218 is not required, and further includes a locking groove 218a and a first receiving projection 219a. On the other hand, except for the locking groove 218a and the first receiving projection 219a, repeated descriptions of the same components as the embodiment of the present invention will be omitted.

The engaging groove 218a is formed in the engaging projection 214 to be recessed inward from the outer surface of the engaging projection 214. In addition, the locking groove 218a functions to engage the inner protrusion 418a of the downward bending portion 416 inserted into the insertion hole 216. That is, when the downward bending portion 416 is inserted into the insertion hole 216, the inner protrusion 418a is seated in the locking groove 218a, and the downward bending portion 416 is inserted into the insertion hole 216. ) Even if a force is applied upward to the rung beam 14 in a state in which the insertion is completed, the inner protruding portion 418a is prevented so that the downward bending portion 416 is prevented from deviating upward from the insertion hole 216. It is caught in the locking groove 218a. In other words, the engaging groove 218a limits the clearance in the height direction of the guardrail beam 12 of the rung beam 14 instead of the engaging jaw 218. Furthermore, the locking groove 218a may be formed in the central portion of the engaging projection 214 when viewed in the width direction of the guardrail beam 12, but is not limited thereto.

The first receiving protrusion 219a protrudes inward from the inner surface of the guardrail beam 12 from the lower side of the engaging protrusion 214. In addition, the first receiving protrusion 219a functions to be caught in the first receiving hole 419 of the downward bending portion 416 inserted in the insertion hole 216. That is, when the downward bending portion 416 is inserted into the insertion hole 216, the first receiving protrusion 219a is seated on the first receiving hole 419, and the downward direction to the insertion hole 216 Even if a force is applied upward to the rung beam 14 in a state where the insertion of the bending portion 416 is completed, the first accommodating is prevented so that the downward bending portion 416 is prevented from deviating upward from the insertion hole 216. The protrusion 219a is caught in the first receiving hole 419. In other words, the first accommodating protrusion 219a reinforces limiting the clearance in the height direction of the guardrail beam 12 of the rung beam 14. Therefore, the downward bending portion 416 is firmly fixed to the insertion hole 216. Furthermore, the first receiving protrusion 219a may be formed by pressing a portion of the guardrail beam 12 by processing such as notching to deform a portion of the guardrail beam 12.

13 is a partially enlarged view of a rung beam of a cable tray according to another embodiment of the present invention.

13, the rung beam 14 according to another embodiment of the present invention is compared with the guardrail coupling part 412 according to another embodiment of the present invention, the inner protrusion 418 is deleted, The second receiving hole 419a is further included. On the other hand, except for the second receiving hole 419a, repeated descriptions of the same components as other embodiments of the present invention will be omitted.

The second receiving hole 419a is formed in the downward bending portion 416 to be recessed outward from the inner surface of the downward bending portion 416. In addition, the second receiving hole 419a may be formed in the central portion of the downward bending part 416 when viewed in the longitudinal direction of the rung beam 14, but is higher than the first receiving hole 419. Is formed on. In FIG. 13, the second receiving hole 419a is shown drilled through the downward bending portion 416, but is not limited thereto.

14 is a partially enlarged view of the outside of the guardrail beam of the cable tray according to another embodiment of the present invention, and FIG. 15 is a partially enlarged view of the inside of the guardrail beam of the cable tray according to another embodiment of the present invention, 16 is a partially enlarged view of a cross section showing a state in which a guardrail beam and a rung beam of a cable tray are combined according to another embodiment of the present invention.

14 to 16, the rung engaging portion 212 according to another embodiment of the present invention has a locking groove 218a compared to the rung engaging portion 212 according to another embodiment of the present invention. It is deleted, and further includes a second receiving projection (219b). On the other hand, except for the second receiving projection (219b), repeated description of the same components as other embodiments of the present invention will be omitted.

The second receiving protrusion 219b is formed in the engaging projection 214 so as to protrude outward from the outer surface of the engaging projection 214. In addition, the second receiving protrusion 219b functions to be caught in the second receiving hole 419a of the downward bending part 416 inserted in the insertion hole 216. That is, when the downward bending portion 416 is inserted into the insertion hole 216, the second receiving protrusion 219b is seated on the second receiving hole 419a, and the downward direction to the insertion hole 216 Even if a force is applied upward to the rung beam 14 in a state in which the insertion of the bending portion 416 is completed, the second accommodating is prevented so that the downward bending portion 416 is prevented from deviating upward from the insertion hole 216. The hole 419a is caught by the second receiving protrusion 219b. In other words, the second receiving protrusion 219b limits the clearance in the height direction of the guardrail beam 12 of the rung beam 14 instead of the engaging groove 218a. Furthermore, the second receiving projection 219b may be formed in the central portion of the engaging projection 214 when viewed in the width direction of the guardrail beam 12, but is not limited thereto. Further, the second receiving protrusion 219b may be formed by pressing a portion of the engaging protrusion 214 by processing such as notching to deform a portion of the engaging protrusion 214. On the other hand, when a downward force is applied to the rung beam 14 when the downward bending portion 416 is inserted into the insertion hole 216, the first receiving protrusion 219a and the second receiving protrusion 219b Of course, the insertion of the downward bending part 416 is completed as the elastic deformation is performed.

As described above, according to the embodiment of the present invention, the welding process, and without bolting, the guardrail beam 12 and the rung beam 14 are combined while securing the bonding strength, thereby simplifying the manufacturing process and reducing manpower, The possibility of defects can be reduced. In addition, by eliminating the process including welding, the bonding strength of the guardrail beam 12 and the rung beam 14 becomes uniform, and ultimately, the overall rigidity of the cable tray 10 can be improved.

The preferred embodiments of the present invention have been described above, but the present invention is not limited to the above embodiments, and is easily changed and equalized by those skilled in the art from the embodiments of the present invention. Includes all changes to the extent deemed acceptable.

10: cable tray 12: guardrail beam
14: rung beam
212: rung engaging portion 214: engaging projection
216: insertion hole 216a: insertion entrance
216b: insertion exit 218: locking jaw
218a: engaging groove 219: pressurized projection
219a: first receiving projection 219b: second receiving projection
220: work hall
410: rung top surface 412: guardrail coupling
414: upward bending portion 416: downward bending portion
418, 418a: inner protrusion 419: first receiving hole
419a: 2nd reception hall
420: rung side 422: outward extension
430: incision

Claims (40)

In the cable tray is provided so that the bundle is arranged, the cable is arranged,
A pair of guardrail beams arranged in parallel so as to block both sides in the width direction of the cable bundle, and having a constant length, a constant width, and a constant height;
A plurality of rung beams connecting the pair of guardrail beams between the pair of guardrail beams, having a constant length, constant width, and constant height, and arranged to support the cable bundle;
Including,
The longitudinal direction of the guardrail beam is the same as the longitudinal direction of the cable bundle, and one end in the longitudinal direction of the rung beam is connected to an inner surface of one of the pair of guardrail beams, and the other end in the longitudinal direction of the rung beam is the It is connected to the inner surface of the other of the pair of guardrail beams, the rung beams are coupled by inserting each part of one end and the other end in the longitudinal direction downward to the guardrail beam,
The rung beam,
A rung upper surface which is an upper side surface supporting the cable bundle; And
A guardrail coupling portion formed at one end and the other end in the longitudinal direction so as to be combined with the guardrail beam;
Including,
The guard rail coupling portion,
An upward bending portion which is bent upward from the upper surface of the rung;
A downward bending portion that is bent downward and extends while forming a curved surface from the extended upward bending portion; And
An inner protrusion protruding inward from an inner surface of the downward bending part;
It includes,
The guardrail beam,
A plurality of rung coupling portions formed along a longitudinal direction to be arranged at positions corresponding to the rung beams;
Including,
The rung coupling portion,
A coupling protrusion protruding inward from the inner surface to have a cross section of an “U” shape opened outward along the height direction; And
As the hollow of the "U" shaped coupling projection, the downward bending portion is inserted into the insertion hole;
Cable tray comprising a. According to claim 1,
The cable tray, characterized in that the longitudinal direction of the rung beam and the longitudinal direction of the guardrail beam are orthogonal. According to claim 1,
Cable tray, characterized in that the plurality of rung beams are arranged at equal intervals. delete According to claim 1,
The rung coupling portion,
As a part of the lower portion of the engaging projection, when the downward bending portion is to be released upward from the insertion hole in a state in which the insertion is completed, the cable tray further comprises a locking jaw functioning to engage the inner projection. According to claim 1,
The rung coupling portion,
If the inner projection is recessed inward from the outer surface of the engaging projection and the insertion of the downward bending portion is completed and the downward bending portion tries to escape upward from the insertion hole, a locking groove that functions to engage the inner projection Cable tray, characterized in that it further comprises. According to claim 1,
The upward bending portion is formed to be inclined to extend outwardly while extending upward, and the downward bending portion extends in a vertical direction without inclination. According to claim 1,
The inner protrusion is formed by pressing a portion of the downward bending portion to deform the portion of the downward bending portion. According to claim 1,
The guard rail coupling portion,
Further comprising a receiving hole recessed inward from the outer surface of the downward bending portion from the lower side of the inner projection,
The rung coupling portion,
Further comprising a receiving projection protruding inward from the inner surface of the guardrail beam from the lower side of the engaging projection,
When the receiving projection is seated in the receiving hole in the state in which the downward bending portion is inserted, when the downward bending portion is to be released upward from the insertion hole, the receiving protrusion is caught in the receiving hole. According to claim 1,
The rung beam is formed to have a cross section of a "U" shape opened downward along the longitudinal direction, and the top surface of the rung is an upper side of the "U" shape opened downward. The method of claim 10,
The rung beam,
In the "U" shape opened downward, both sides in the width direction, a pair of rung sides arranged in parallel;
An outward extension extending from the one end and the other end in the longitudinal direction of the rung side to the same plane as the plane in which the downward bending portion is disposed based on the longitudinal direction from the rung side; And
An incision that is a space formed between the guardrail engaging portion and the outwardly extending portion;
Cable tray further comprising a. The method of claim 11,
The pair of guardrail beams are each formed to have a cross section of an "U" shape opened inward,
Cable tray, characterized in that at least one of the lower end of the lower bending portion and the lower side of the rung side in contact with the lower side in the shape of the "U" of the guardrail beam in the state where the insertion of the downward bending portion into the insertion hole is completed. According to claim 1,
Cable tray, characterized in that the plurality of rung coupling portion has the same phase with respect to the height direction. The method of claim 5,
Cable tray characterized in that the lower end of the engaging projection has a shape recessed upward so that the engaging jaw is disposed on the upper side from the bottom of the engaging projection. According to claim 1,
The thickness of the guardrail beam width direction thickness of the inner protrusion is partially greater than the uniform width of the guardrail beam width direction of the insertion hole. The method of claim 15,
A force is applied downward to the rung beam so that the lower end of the downward bending portion passes through the insertion inlet, which is the portion surrounding the upper end of the coupling protrusion of the insertion hole, so that the lower end of the downward bending portion is coupled to the insertion hole while the coupling protrusion is elastically deformed. Cable tray characterized in that it moves to a position where insertion of the downward bending portion is completed through an insertion outlet, which is a portion surrounded by a lower portion of the projection. The method of claim 15,
A cable tray, characterized in that the cross section in the width direction of the rung beam of the inner protrusion gradually decreases as it goes downward. According to claim 1,
Cable tray, characterized in that the lower end of the upper surface of the rung is in contact with the engaging projection in the state in which the insertion of the downward bending portion into the insertion hole is completed. According to claim 1,
The rung engaging portion exposes the engaging projection to the outside so that additional work for reinforcing the bonding strength of the guardrail engaging portion and the rung engaging portion can be performed as necessary, and the working hole drilled in the width direction of the guardrail beam. Cable tray further comprising. According to claim 1,
The rung coupling portion,
Cable tray further comprising a pressing protrusion that protrudes inward from the inner surface of the guardrail beam from the lower side of the coupling protrusion and presses the outer surface of the downward bending portion in a state in which the downward bending portion is inserted into the insertion hole. . The method of claim 20,
The pressing protrusion is a cable tray, characterized in that the circular projection formed in a shape that is a part of the sphere. The method of claim 20,
A force is applied downward to the rung beam after the lower end of the downward bending portion sequentially passes through the insertion inlet, which is the part of the upper end of the engaging projection of the insertion hole, and the insertion outlet, which is the lower end of the engaging projection of the insertion hole. Cable tray characterized in that the coupling protrusion is elastically deformed so that the pressing protrusion is moved to a position pressing the outer surface of the downward bending portion. The method of claim 9,
The receiving projection is formed by pressing the outside of the guardrail beam to form a portion of the guardrail beam is deformed. In the cable tray is provided so that the bundle is arranged, the cable is arranged,
A pair of guardrail beams arranged in parallel so as to block both sides in the width direction of the cable bundle, and having a constant length, a constant width, and a constant height;
A plurality of rung beams connecting the pair of guardrail beams between the pair of guardrail beams, having a constant length, constant width, and constant height, and arranged to support the cable bundle;
Including,
The longitudinal direction of the guardrail beam is the same as the longitudinal direction of the cable bundle, and one end in the longitudinal direction of the rung beam is connected to an inner surface of one of the pair of guardrail beams, and the other end in the longitudinal direction of the rung beam is the It is connected to the inner surface of the other of the pair of guardrail beams, the rung beams are coupled by inserting each part of one end and the other end in the longitudinal direction downward to the guardrail beam,
The rung beam,
A rung upper surface which is an upper side surface supporting the cable bundle; And
A guardrail coupling portion formed at one end and the other end in the longitudinal direction so as to be combined with the guardrail beam;
Including,
The guard rail coupling portion,
A downward bending portion bent downward from the upper surface of the rung and extending in a vertical direction;
A first accommodating hole recessed inward from an outer surface of the downward bending portion; And
A second accommodating hole recessed outward from an inner surface of the downward bending part at an upper side than the first accommodating hole;
It includes,
The guardrail beam,
A plurality of rung coupling portions formed along a longitudinal direction to be arranged at positions corresponding to the rung beams;
Including,
The rung coupling portion,
A coupling protrusion protruding inward from the inner surface to have a cross section of an “U” shape opened outward along the height direction;
As the hollow of the "U" shaped coupling projection, the downward bending portion is inserted into the insertion hole;
A first receiving protrusion protruding inward from an inner surface of the guardrail beam at a lower side of the engaging protrusion; And
A second receiving protrusion protruding outward from an outer surface of the engaging protrusion;
Including,
In the state in which the downward bending portion is inserted, the first receiving protrusion is seated in the first receiving hole, and the second receiving protrusion is seated in the second receiving hole so that the downward bending part is separated from the insertion hole upward. If it is, the cable tray, characterized in that while the first receiving projection is caught in the first receiving hole, the second receiving projection is caught in the second receiving hole. The method of claim 24,
The rung beam is formed to have a cross section of a "U" shape opened downward along the longitudinal direction, and the top surface of the rung is an upper side of the "U" shape opened downward. The method of claim 25,
The rung beam,
In the "U" shape opened downward, both sides in the width direction, a pair of rung sides arranged in parallel;
An outward extension extending from the one end and the other end in the longitudinal direction of the rung side to the same plane as the plane in which the downward bending portion is disposed based on the longitudinal direction from the rung side; And
An incision that is a space formed between the guardrail engaging portion and the outwardly extending portion;
Cable tray further comprising a. The method of claim 26,
The pair of guardrail beams are each formed to have a cross section of an "U" shape opened inward,
Cable tray, characterized in that at least one of the lower end of the lower bending portion and the lower side of the rung side in contact with the lower side in the shape of the "U" of the guardrail beam in the state where the insertion of the downward bending portion into the insertion hole is completed. The method of claim 24,
Cable tray, characterized in that the plurality of rung coupling portion has the same phase with respect to the height direction. The method of claim 24,
Cable tray, characterized in that the lower end of the upper surface of the rung is in contact with the engaging projection in the state in which the insertion of the downward bending portion into the insertion hole is completed. The method of claim 24,
The rung engaging portion exposes the engaging projection to the outside so that additional work for reinforcing the bonding strength of the guardrail engaging portion and the rung engaging portion can be performed as necessary, and the working hole drilled in the width direction of the guardrail beam. Cable tray further comprising. The method of claim 24,
The first receiving projection is formed by pressing the outside of the guardrail beam to deform a part of the guardrail beam,
The second receiving projection is formed by pressing the inner portion of the engaging projection, a portion of the engaging projection is formed by deformation of the cable tray. The method of claim 24,
The first receiving hole and the second receiving hole is a cable tray, characterized in that perforated in the downward bending portion. A method of assembling a cable tray for assembling a pair of guardrail beams arranged in parallel so as to block both sides in the width direction of the cable bundle and a plurality of rung beams arranged to support the cable bundle,
The rung beam has one end and the other end so that one end of the rung beam is connected to an inner surface of one of the pair of guardrail beams, and the other end of the rung beam is connected to an inner surface of the other of the pair of guardrail beams. Each part is performed by being inserted downward in the guardrail beam,
The rung beam including an upper side rung upper surface, an upward bending portion extending from the upper end of the rung and extending upwardly at one end and the other end, and a downward bending portion extending downward from the extended upward bending portion. ,
In the guardrail beam including a coupling protrusion protruding from an inner surface to have a cross section of an "U" shape opened outward, and a hollow insertion hole of the "U" shape coupling protrusion,
The method of assembling the cable tray, characterized in that the downward bending portion is coupled by being inserted downward into the insertion hole. delete The method of claim 33,
When the rung beam further comprising an inner protrusion protruding inward from the downward bending part is attempted to deviate upward in a state in which the downward bending part is inserted, a cable characterized in that the inner protrusion is caught by a part of the coupling protrusion How to assemble the tray. The method of claim 35,
When the downward bending portion is formed in the insertion hole, the inner protrusion having a thickness partially greater than the width of the insertion hole,
A method of assembling a cable tray, characterized in that the downward bending part is inserted while the coupling protrusion is elastically deformed by applying a force downward to the rung beam. The method of claim 36,
A method of assembling a cable tray, characterized in that as the thickness of the inner protrusion gradually decreases toward the bottom, the coupling protrusion is easily elastically deformed and insertion of the downward bending part is completed. The method of claim 33,
The rung beam further comprising a first receiving hole perforated in the downward bending portion and a second receiving hole perforated in the downward bending portion at an upper side than the first receiving hole, upward while the insertion of the downward bending portion is completed. When attempting to escape, the first receiving hole is caught by the first receiving projection protruding inward from the inner surface of the guardrail beam from the lower side of the engaging projection, and the second receiving hole protruding outward from the outer surface of the engaging projection Method of assembling the cable tray, characterized in that the second receiving projection. The method of claim 38,
When the downward bending portion is inserted into the insertion hole, a force is applied downward to the rung beam, and the first receiving projection and the second receiving projection are elastically deformed, so that the insertion of the downward bending portion is completed. How to assemble. The method of claim 33,
The guardrail beam has a working hole perforated in the width direction of the guardrail beam so that the coupling protrusion is exposed to the outside,
Method for assembling the cable tray, characterized in that additional work for reinforcing the combined strength of the guardrail beam and the rung beam through the work hole is performed as required.

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