A rapid combined steel structure support for construction of a bent cap

Abstract

The application discloses a rapid combined steel structure support for bent cap construction and particularly relates to the field of bridge construction. The rapid combined steel structure support for bent cap construction comprises a pier column, a hoop component and a support beam component. The hoop component comprises two hoop bodies, both of which are installed on the pier column and have a circumference smaller than that of the pier column after being assembled together. The support beam component comprises beam piece combination component one and beam piece combination component two, which are symmetrically arranged on the hoop body. Guardrail mechanisms are arranged on both the beam piece combination component one and the beam piece combination component two. The beam piece combination component one and the beam piece combination component two are prefabricated, so that the support beam component can be quickly assembled during construction, the assembly period is shortened, the work efficiency is improved, and the workload of the workers is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bridge construction, more particularly, the present application relates to a rapid combined steel structure support for bent cap construction. BACKGROUND

[0002] The bent cap, also known as the hat beam, is an important component in bridge engineering, which is mainly used to support the upper structure of the bridge and transmit the load to the lower structure (such as the pier or abutment). With the acceleration of urbanization process in China and the continuous expansion of city scale, a large number of bridge and city overpass infrastructure construction are stimulated. The steel structure support used in the construction of the bent cap is a temporary support structure, which is used to support the pouring or installation of the bent cap during the construction of the bridge. Its main function is to ensure that the bent cap can safely and stably bear its own weight and other construction loads during the construction period, and to ensure the construction quality and safety.

[0003] The steel structure support used in the construction of the bent cap is currently commonly used in the construction method of high-altitude scattered piece assembly steel platform, that is, the parts are hoisted one by one to high altitude by the crane, and then the workers assemble them one by one to construct the support.

[0004] However, the above-mentioned support has the problems of long assembly period, low efficiency, long time of manual and mechanical use, long time of high-altitude work of workers, difficult protection and certain safety hazards. SUMMARY

[0005] The present application provides a rapid combined steel structure support for bent cap construction, which solves the problems of the existing bent cap construction steel structure support, which needs to use a crane to hoist the parts one by one to high altitude, and then the workers assemble them one by one to construct the support. This way has the problems of long assembly period, low efficiency, long time of manual and mechanical use, long time of high-altitude work of workers, difficult protection and certain safety hazards.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a rapid combined steel structure support for bent cap construction, comprising a pier column, a hoop component and a support beam component, the hoop component comprising two hoop body, the two hoop body are installed on the pier column, the circumference of the two hoop body assembled together is smaller than the circumference of the pier column;

[0007] The support beam component comprises a beam piece combination component one and a beam piece combination component two, the beam piece combination component one and the beam piece combination component two are symmetrically arranged on the hoop body, and the beam piece combination component one and the beam piece combination component two are provided with guardrail mechanisms.

[0008] In a preferred embodiment, the hoop component comprises a reinforcing rib, the wing plate is arranged on the hoop body, the reinforcing rib is fixedly arranged on the wing plate, the ear plate is fixedly arranged on the hoop body, the platform plate is fixedly arranged on the ear plate, and the two hoop bodies are fixedly arranged by a bolt set.

[0009] In a preferred embodiment, the rubber pad is fixedly arranged on the hoop body, and the rubber pad is attached to the pier after the hoop body is installed on the pier. The thickness of the rubber pad is 1 cm.

[0010] In a preferred embodiment, the beam piece combination component one and the beam piece combination component two each comprise a longitudinal beam one, the longitudinal beam one is fixedly arranged on the platform plate, the cross beam is fixedly arranged on the longitudinal beam one, the longitudinal beam two is fixedly arranged on the cross beam, and the same connecting plate is fixedly arranged on the two corresponding longitudinal beam twos.

[0011] In a preferred embodiment, the support beam component further comprises a guardrail mechanism, the guardrail mechanism comprises a guardrail, the fixed plate is fixedly arranged on the cross beam, and the guardrail is arranged on the fixed plate.

[0012] In a preferred embodiment, the fixed plate is fixedly arranged with a rail base, the rail base is provided with a through hole, the hinge two is movably arranged in the through hole, the guardrail is rotatably arranged on the hinge two, the positioning hole is arranged on the rail base and the guardrail, and the hinge one is movably clamped in the positioning hole.

[0013] A construction method of a rapid type combined steel structure support for a bent cap construction, comprising the following steps:

[0014] Step one: install the two hoop bodies at the specified height position of the pier;

[0015] Step two: combine and assemble the beam piece combination component one and the beam piece combination component two, combine and weld the longitudinal beam one, the longitudinal beam two, and the cross beam, and weld the fixed plate and the rail base;

[0016] Step three: weld the fixed plate on the cross beam, keep the guardrail mechanism in a laid-down state, and use a crane to hoist the beam piece combination component one and the beam piece combination component two to the hoop body for fixation;

[0017] Step four: install the longitudinal beam one on the wing plate, install the connecting plate on the platform plate, and then fix the beam piece combination component one and the beam piece combination component two through the connecting plate;

[0018] Step five: stand up the guardrail mechanism, insert the hinge one into the positioning hole, and position the guardrail mechanism through the hinge one.

[0019] The utility model provides a kind of bent cap construction fast type combined steel structure support processing equipment, including box, support table is provided in box, workpiece one is placed on support table, positioning component is provided on support table, positioning component includes support seat, electric heating wire is fixedly arranged on support seat, support seat is used to support workpiece one, positioner is provided in box, workpiece two is clamped on positioner, welding mechanism is provided in box, and welding mechanism includes welding torch, and welding torch is used to weld the contact position of workpiece one and workpiece two.

[0020] The utility model provides a kind of bent cap construction fast type combined steel structure support processing equipment, positioning component includes support frame, support frame is fixedly set on support table, sliding seat is slidably arranged on support frame, support seat is fixedly arranged on sliding seat, gear one is rotatably arranged on support frame, guide hole is formed on gear one, connecting shaft is fixedly arranged on sliding seat, and connecting shaft is slidably arranged on guide hole, gear two is rotatably arranged on support frame, and gear two is engaged with gear one.

[0021] The utility model provides a kind of bent cap construction fast type combined steel structure support processing equipment, and welding mechanism includes fixed seat one, and fixed seat one is fixedly set on the top inner wall of box, adjusting seat one is slidably arranged in fixed seat one, fixed seat two is fixedly arranged on adjusting seat one, adjusting seat two is slidably arranged on fixed seat two, and welding torch is fixedly set on adjusting seat two.

[0022] The utility model has the advantages of:

[0023] 1、the utility model discloses a prefabricated assembly type beam piece combined component one and beam piece combined component two are set, can quickly assemble support beam component when construction, shorten splicing period, improve work efficiency, reduce the workload of staff.

[0024] 2、the utility model discloses a guardrail that can be quickly laid down and set up, can avoid the interference caused by guardrail when hoisting, and can also play the effect of safety protection to staff.

[0025] 3、the utility model discloses positioning component, when workpiece one and workpiece two are welded and processed, workpiece one can be supported and limited, to avoid the local high temperature of workpiece one when welding, cause internal response to change and thus cause deformation. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is the three-dimensional structure schematic diagram of the pier column of the utility model.

[0027] Figure 2 It is the structure schematic diagram of beam piece combined component one and beam piece combined component two from the top.

[0028] Figure 3 It is the three-dimensional structure schematic diagram of the hoop body.

[0029] Figure 4 Fig. 1 is a perspective view of the beam piece combination component one of the present application.

[0030] Figure 5 Fig. 2 is a front view of the pier column of the present application.

[0031] Figure 6 Fig. 3 is a front view of the cross beam of the present application.

[0032] Figure 7 Fig. 4 is a perspective view of the guardrail of the present application.

[0033] Figure 8 Fig. 5 is a perspective view of the guardrail of the present application. Figure 7 Fig. 6 is a perspective view of the guardrail of the present application.

[0034] Figure 9 Fig. 7 is a perspective view of the railing base of the present application.

[0035] Figure 10 Fig. 8 is a perspective view of the box of the present application.

[0036] Figure 11 Fig. 9 is a front view of the box of the present application.

[0037] Figure 12 Fig. 10 is a perspective view of the fixed seat one of the present application.

[0038] Figure 13 Fig. 11 is a perspective view of the support seat of the present application.

[0039] Figure 14 Fig. 12 is a flow chart of the construction method of the present application.

[0040] The reference signs are as follows: 1, pier column; 2, hoop component; 21, hoop body; 22, reinforcing rib; 23, ear plate; 24, platform plate; 25, bolt set; 3, support beam component; 31, beam piece combination component one; 311, longitudinal beam one; 312, longitudinal beam two; 313, cross beam; 314, connecting plate; 32, beam piece combination component two; 33, guardrail mechanism; 331, guardrail; 332, fixed plate; 333, railing base; 334, hinge one; 335, hinge two; 4, box; 5, welding mechanism; 51, welding gun; 52, fixed seat one; 53, rotating driver one; 54, adjusting seat one; 55, fixed seat two; 56, adjusting seat two; 6, positioning component; 61, support frame; 62, sliding seat; 63, support seat; 64, gear one; 641, guide hole; 65, connecting shaft; 66, gear two; 7, positioner. DETAILED DESCRIPTION

[0041] The application will be described in further detail below with reference to the drawings. It is necessary to point out here that the following specific embodiments are only used to further illustrate the application and cannot be understood as limiting the scope of protection of the application, and those skilled in the art can make some non-essential improvements and adjustments to the application according to the above application content.

[0042] With reference to the drawings accompanying the specification Figures 1 to 9 The application discloses a quick combined steel structure support for girder construction, which comprises a pier column 1, a hoop component 2 and a support beam component 3. The hoop component 2 comprises two hoop body 21s, both of which are installed on the pier column 1 and have a circumference smaller than that of the pier column 1 after being assembled together. The support beam component 3 comprises a beam piece combined component one 31 and a beam piece combined component two 32, which are symmetrically arranged on the hoop body 21 and are both provided with a guardrail mechanism 33.

[0043] The implementation scene is specifically that the hoop body 21 is arranged on the pier column 1, the circumference of the two hoop body 21s installed on the pier column 1 is smaller than that of the pier column 1, the hoop body 21 can be stably fixed on the pier column 1 during installation, and then the beam piece combined component one 31 and the beam piece combined component two 32 are respectively hoisted to the hoop body 21, so that the beam piece combined component one 31 and the beam piece combined component two 32 are supported by the hoop body 21. Compared with the existing mode of hoisting the component one to the sky and then assembling, the construction efficiency is improved, and the workload of the workers is reduced.

[0044] With reference to the drawings accompanying the specification Figures 1 to 3 The hoop component 2 comprises a reinforcing rib 22, the hoop body 21 is provided with a wing plate, the reinforcing rib 22 is fixedly arranged on the wing plate, the hoop body 21 is fixedly provided with an ear plate 23, the ear plate 23 is fixedly provided with a platform plate 24, and the two hoop body 21s are fixedly arranged through bolts.

[0045] It should be noted that bolt holes are formed in the wing plate, and bolts are installed in the bolt holes, and the two hoop body 21s are fixed through the bolt set 25.

[0046] With reference to the drawings accompanying the specification Figures 1 to 3 In order to improve the friction between the pier column 1 and the hoop body 21, specifically, the hoop body 21 is fixedly provided with a rubber pad, the rubber pad is attached to the pier column 1 after the hoop body 21 is installed on the pier column 1, and the thickness of the rubber pad is 1 cm.

[0047] It should be noted that the rubber has a certain surface roughness, which helps to increase the friction between the contact surface. When two surfaces are in contact, the actual contact area is much smaller than the apparent contact area, and the micro-roughness of the rubber can increase the number of actual contact points, thereby increasing the friction.

[0048] Referring to the drawings accompanying the specification Figures 1 to 9 , the beam piece combination part one 31 and the beam piece combination part two 32 each include a longitudinal beam one 311 fixedly arranged on the platform plate 24, a transverse beam 313 fixedly arranged on the longitudinal beam one 311, a longitudinal beam two 312 fixedly arranged on the transverse beam 313, and a same connecting plate 314 fixedly arranged on the corresponding two longitudinal beam two 312. The support beam part 3 further includes a guardrail mechanism 33, which includes a guardrail 331, and a fixed plate 332 fixedly arranged on the transverse beam 313, and the guardrail 331 is arranged on the fixed plate 332.

[0049] It should be noted that after the beam piece combination part one 31 and the beam piece combination part two 32 are respectively hoisted onto the hoop body 21, the beam piece combination part one 31 and the beam piece combination part two 32 are connected through the connecting plate 314, which can quickly assemble the beam piece combination part one 31 and the beam piece combination part two 32 and reduce the workload of the workers.

[0050] It should also be noted that the fixed plate 332 is arranged to facilitate the installation of the guardrail 331.

[0051] Referring to the drawings accompanying the specification Figures 1 to 9 , in order to ensure the safety of the workers during construction, specifically, a handrail base 333 is fixedly arranged on the fixed plate 332, a through hole is formed in the handrail base 333, a hinge two 335 is movably arranged in the through hole, the guardrail 331 is rotatably arranged on the hinge two 335, and a positioning hole is formed in the handrail base 333 and the guardrail 331, and a hinge one 334 is movably clamped in the positioning hole.

[0052] It should be noted that after the beam piece combination part one 31 and the beam piece combination part two 32 are hoisted, the default state of the guardrail mechanism 33 is the laid-down state, which facilitates the workers to be located on the beam piece combination part one 31 and the beam piece combination part two 32, and then the guardrail 331 is limited through the hinge one 334, so that the guardrail 331 is in the vertical state, and the workers on the beam piece combination part one 31 and the beam piece combination part two 32 are protected through the guardrail 331.

[0053] Referring to the drawings accompanying the specification Figure 14 , the construction method of the cover beam construction rapid type combined steel structure support includes the following steps:

[0054] Step one: install two hoop body 21 at the specified height position of the pier column 1;

[0055] Step two: the beam piece assembly part one 31 and the beam piece assembly part two 32 are assembled respectively, the longitudinal beam one 311, the longitudinal beam two 312 and the cross beam 313 are assembled and welded, and the fixed plate 332 and the handrail base 333 are welded;

[0056] Step three: the fixed plate 332 is welded on the cross beam 313, the guardrail mechanism 33 is kept in a laid-down state, and the beam piece assembly part one 31 and the beam piece assembly part two 32 are respectively hoisted to the hoop body 21 by a crane for fixation;

[0057] Step four: the longitudinal beam one 311 falls on the wing plate for installation, the connecting plate 314 falls on the platform plate 24 for installation, and then the beam piece assembly part one 31 and the beam piece assembly part two 32 are fixed through the connecting plate 314;

[0058] Step five: the guardrail mechanism 33 is erected, the hinge one 334 is inserted into the positioning hole to position the guardrail mechanism 33 through the hinge one 334.

[0059] The hoop body 21 is a semicircular structure, and two hoop bodies 21 are installed on the pier 1 in cooperation during use, and the connecting plate 314 is supported by the platform plate 24 on the hoop body 21, so the connection between the platform plate 24 and the hoop body 21 needs to be very firm, that is, the lug plate 23 needs to be welded on the hoop body 21, the platform plate 24 is welded on the lug plate 23, and the lug plate 23 is welded on the hoop body 21. During welding processing, first, the hoop body 21 is positioned, then the lug plate 23 is placed at the specified position of the hoop body 21, and then the contact position between the hoop body 21 and the lug plate 23 is welded. However, when the hoop body 21 and the lug plate 23 are welded, the metal in the weld area and its vicinity is heated to a very high temperature, which will cause thermal expansion of this part of the metal, and the metal in the weld area will generate internal stress, which is caused by the expansion of the metal when heated and the inability to freely shrink when cooled. When these stresses exceed the yield strength of the material, plastic deformation will occur, that is, after the lug plate 23 is welded on the hoop body 21, the hoop body 21 will be deformed, which will cause the inability to be installed on the pier 1. To avoid the above situation, the lug plate 23 welded on the hoop body 21 needs to be regulated and controlled, and the lug plate 23 is placed on the hoop body 21 in the specified position, and then the lug plate 23 and the hoop body 21 are welded. The lug plate 23 is welded on the hoop body 21, and the lug plate 23 is placed on the hoop body 21 in the specified position, and then the lug plate 23 and the hoop body 21 are welded. Figures 10 to 13, specifically, a processing equipment for a quick combined steel structure support for bent cap construction, the processing equipment for a quick combined steel structure support for bent cap construction comprises a box body 4, a support table is arranged in the box body 4, a workpiece one is placed on the support table, a positioning component 6 is arranged on the support table, the positioning component 6 comprises a support seat 63, an electric heating wire is fixedly arranged on the support seat 63, the support seat 63 is used for supporting the workpiece one, a positioner 7 is arranged in the box body 4, a workpiece two is clamped on the positioner 7, a welding mechanism 5 is arranged in the box body 4, the welding mechanism 5 comprises a welding gun 51, and the welding gun 51 is used for welding at a contact position of the workpiece one and the workpiece two.

[0060] It should be noted that the workpiece one is the hoop body 21, and the workpiece two is the ear plate 23, a linear driver is fixedly arranged on the support table, a positioning seat is fixedly arranged on an output shaft of the linear driver, the linear driver is a gas cylinder, after the workpiece one is placed on the support table, the output shaft of the gas cylinder moves towards the workpiece one to position the workpiece one, the positioner 7 is a mechanical arm, a negative pressure suction nozzle is fixedly arranged on an end effector of the mechanical arm, a gas pump is fixedly communicated with the negative pressure suction nozzle, a negative pressure suction force is generated on the negative pressure suction nozzle after the gas pump is started, and the negative pressure suction nozzle, the gas pump and the mechanical arm are mature prior art and will not be described in detail here. The pier 1 is also provided with a lifter, the lifter is vertically arranged in the pier 1, and a placing table is fixedly arranged on an output shaft of the lifter, the lifter is used for adjusting the height of the support table in the pier 1, and the lifter is a linear motor.

[0061] It should be further noted that the workpiece one is placed on the support table, the support seat 63 supports the arc-shaped surface of the workpiece one, then the workpiece one is positioned by the linear driver, so that the workpiece one is tightly attached to the support seat 63, then the electric heating wire is turned on, the workpiece one is preheated by the electric heating wire to increase the temperature of the workpiece one, the height of the support table is adjusted, then the end effector of the positioner 7 positions the workpiece two, the workpiece one is attached to the workpiece two, and then the welding gun 51 is used for welding the attachment area. Since the temperature of the workpiece one is increased before welding, the workpiece one will not generate local high temperature during welding, the overall slow temperature drop of the workpiece one can avoid the deformation caused by stress change, and the workpiece one is fixed between the support seat 63, so that the support seat 63 can support the workpiece one, further preventing the workpiece one from deforming.

[0062] Referring to the drawings in the specification Figures 10 to 13Since the specifications of the pier column 1 are different, that is, the circumferences of the pier column 1 are different, the circumferences of the workpieces I matched with the pier column 1 are also different, in order to adapt to the circumferences of different workpieces I, the support seat 63 can stably support and limit the workpieces I, and prevent the workpieces I from being deformed during welding, specifically, the positioning component 6 comprises a support frame 61 fixedly arranged on the support table, a sliding seat 62 slidingly arranged on the support frame 61, and a support seat 63 fixedly arranged on the sliding seat 62, a gear one 64 rotatingly arranged on the support frame 61, a guide hole 641 formed in the gear one 64, a connecting shaft 65 fixedly arranged on the sliding seat 62 and slidingly arranged in the guide hole 641, and a gear two 66 rotatingly arranged on the support frame 61 and engaged with the gear one 64.

[0063] It should be noted that a motor is fixedly arranged on the support frame 61, and the gear two 66 is fixedly arranged on the output shaft of the motor.

[0064] It should be further noted that the motor is started, the rotation of the output shaft of the motor drives the gear two 66 to rotate, the gear two 66 drives the gear one 64 to rotate in transmission through the engagement with the gear one 64, the rotation of the gear one 64 drives the connecting shaft 65 to slide, the connecting shaft 65 drives the sliding seat 62 to slide under the traction, and the sliding of the sliding seat 62 drives the support seat 63 to move, so that the position distance of the support seat 63 is adjusted, and the support area of the support seat 63 can be adjusted according to the specifications of the workpieces I.

[0065] Referring to the drawings Figures 10 to 13 In order to facilitate the movement of the welding gun 51, specifically, the welding mechanism 5 comprises a fixed seat one 52 fixedly arranged on the top inner wall of the box body 4, an adjusting seat one 54 slidingly arranged in the fixed seat one 52, a fixed seat two 55 fixedly arranged on the adjusting seat one 54, an adjusting seat two 56 slidingly arranged on the fixed seat two 55, and the welding gun 51 fixedly arranged on the adjusting seat two 56.

[0066] It should be noted that a rotating driver one 53 is fixedly arranged on the fixed seat one 52, the rotating driver one 53 is arranged as a motor, a threaded rod is fixedly arranged on the output shaft of the rotating driver one 53, the adjusting seat one 54 is threadedly connected with the threaded rod, a motor is also fixedly arranged on the fixed seat two 55, a lead screw is fixedly arranged on the output shaft of the motor, and the adjusting seat two 56 is threadedly connected with the lead screw, and the rotating driver one 53 and the motor on the fixed seat two 55 are used to drive the welding gun 51 to move horizontally left and right and horizontally forward and backward.

[0067] The above embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the present application. It should be noted that, for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application.

Claims

1. A quick-type combined steel structure support for a bent cap construction, characterized in that, Including pier column (1), hoop component (2) and support beam component (3), the hoop component (2) includes two hoop body (21), two hoop body (21) are installed on pier column (1), the circumference of two hoop body (21) after splicing together is less than the circumference of pier column (1);Platform plate (24) is arranged on the hoop component (2); The support beam component (3) includes beam piece combination component one (31) and beam piece combination component two (32), the beam piece combination component one (31) and beam piece combination component two (32) are symmetrically arranged on hoop body (21), and the beam piece combination component one (31) and beam piece combination component two (32) are provided with guardrail mechanism (33); The beam piece combination component one (31) and beam piece combination component two (32) include longitudinal beam one (311), the longitudinal beam one (311) is fixedly arranged on the platform plate (24), the horizontal beam (313) is fixedly arranged on the longitudinal beam one (311), and the longitudinal beam two (312) is fixedly arranged on the horizontal beam (313), and corresponding two longitudinal beam two (312) are fixedly provided with the same connecting plate (314).

2. The quick-type combined steel structure support for bent cap construction according to claim 1, characterized in that: The hoop component (2) includes reinforcing rib (22), the wing plate is arranged on the hoop body (21), the reinforcing rib (22) is fixedly arranged on the wing plate, the ear plate (23) is fixedly arranged on the hoop body (21), the platform plate (24) is fixedly arranged on the ear plate (23), and the bolt group (25) is fixedly arranged between two hoop body (21).

3. The quick-type combined steel structure support for bent cap construction according to claim 2, characterized in that: The rubber pad is fixedly arranged on the hoop body (21), after the hoop body (21) is installed on the pier column (1), the rubber pad is attached to the pier column (1), and the thickness of the rubber pad is 1 cm.

4. The quick-type combined steel structure support for bent cap construction of claim 1, wherein: The support beam component (3) further includes guardrail mechanism (33), the guardrail mechanism (33) includes protective fence (331), the fixed plate (332) is fixedly arranged on the horizontal beam (313), and the protective fence (331) is arranged on the fixed plate (332).

5. The quick-type combined steel structure support for bent cap construction according to claim 4, characterized in that: The handrail base (333) is fixedly arranged on the fixed plate (332), the through hole is formed in the handrail base (333), the hinge two (335) is movably arranged in the through hole, the protective fence (331) is rotatably arranged on the hinge two (335), and the positioning hole is formed in the handrail base (333) and the protective fence (331), and the hinge one (334) is movably clamped in the positioning hole.

6. The construction method of the bent cap construction rapid combined steel structure support of claim 5, characterized in that, The steps include: Step one: two hoop body (21) are installed at the specified height position of pier column (1); Step two: beam piece combination component one (31) and beam piece combination component two (32) are respectively combined and spliced, longitudinal beam one (311), longitudinal beam two (312) and horizontal beam (313) are combined and welded, and fixed plate (332) and handrail base (333) are welded. Step three: weld the fixed plate (332) on the cross beam (313), keep the guardrail mechanism (33) in a laid-down state, and hoist the beam piece assembly part one (31) and the beam piece assembly part two (32) to the hoop body (21) respectively by a crane to be fixed; Step four: the longitudinal beam one (311) falls on the wing plate to cooperate with the installation, the connecting plate (314) falls on the platform plate (24) to cooperate with the installation, and then the beam piece assembly part one (31) and the beam piece assembly part two (32) are fixed through the connecting plate (314); Step five: stand up the guardrail mechanism (33), insert the hinge one (334) into the positioning hole to position the guardrail mechanism (33) through the hinge one (334).

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