Device and method for testing local buckling performance of ultra-strong thin-wall steel pipe for external operation scaffold
By designing a local buckling performance test device for ultra-strong thin-walled steel pipes with a pressure rod group and a fixture assembly, the problem of hydraulic pressure gauge limitations was solved, accurate local buckling performance testing of ultra-strong thin-walled steel pipes was achieved, and the test accuracy was improved.
Patent Information
- Application Number
- CN202510732195.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-03
- Publication Date
- 2025-09-16
AI Technical Summary
In the existing local buckling performance test device for ultra-strong thin-walled steel pipes used for outdoor work scaffolding, the overall pressure head of the hydraulic pressure gauge limits the accuracy of the local buckling performance test of the ultra-strong thin-walled steel pipes.
A device consisting of a pressure rod group, a pressure gauge and a fixture assembly was designed. The pressure was applied by the pressure rod group and fixed by the fixture assembly, so that bending pressure could be applied to dispersed parts of the ultra-strong thin-walled steel pipe, thereby improving the test accuracy.
The accuracy of the local buckling performance test of ultra-strong thin-walled steel pipes is improved, the problem of hydraulic pressure gauge limitations is solved, and accurate local buckling performance testing of ultra-strong thin-walled steel pipes is achieved.
Smart Images
Figure CN120651675A_ABST
Abstract
Claims
1. A device for testing the local buckling performance of ultra-strong thin-walled steel pipes for outdoor scaffolding, characterized by: The invention comprises a pressure rod group acting on an ultra-strong thin-walled steel pipe, a pressure gauge (1) arranged on the pressure rod group, and a clamp assembly (6) arranged between the pressure gauge (1) and the pressure rod group.
2. The local buckling performance test device for ultra-strong thin-walled steel pipes for outdoor scaffolding according to claim 1 is characterized by: The pressure rod group, the pressure gauge (1) and the clamp assembly (6) are connected to each other in such a way that the ultra-strong thin-walled steel pipe in the local buckling performance test state is located in the downward pressure action area.
3. The local buckling performance test device for ultra-strong thin-walled steel pipes for outdoor scaffolding according to claim 2, characterized in that: The pressure rod group is connected to the pressure gauge (1) and the clamp assembly (6) in a manner of applying bending pressure to dispersed parts of the ultra-strong thin-walled steel pipe.
4. The local buckling performance test device for ultra-strong thin-walled steel pipes for outdoor scaffolding according to claim 1 is characterized by: The pressure rod group is configured to include a central pressure rod (2), a first side pressure rod (3) and a second side pressure rod (4). Or, it further comprises a first accessory device and the first accessory device is arranged between the pressure rod group and the pressure gauge (1), and the first accessory device is arranged as a pressure rod support frame (5), Or, it further includes a second accessory device and the second accessory device is arranged between the pressure rod group and the clamp assembly (6), and the second accessory device is configured to include a first tailstock assembly (7), a second tailstock assembly (8), a support leg (91) and a docking screw nut (92), Or, it further comprises a third accessory device and the third accessory device is arranged on the second accessory device, and the third accessory device is arranged as a stress measuring instrument (9).
5. The local buckling performance test device for ultra-strong thin-walled steel pipes for outdoor scaffolding according to claim 4, characterized in that: A pressure rod support frame (5) is provided on the pressure gauge (1), a central pressure rod (2), a first side pressure rod (3) and a second side pressure rod (4) are respectively provided on the pressure rod support frame (5), and a second tailstock assembly (8) is provided on the first tailstock assembly (7), a stress measuring instrument (9) and a support leg (91) are respectively provided on the first tailstock assembly (7) and the second tailstock assembly (8), and a docking screw nut (92) is provided between the first tailstock assembly (7) and the second tailstock assembly (8), and a clamp assembly (6) is provided between the first tailstock assembly (7) and the second tailstock assembly (8) and the central pressure rod (2), the first side pressure rod (3) and the second side pressure rod (4).
6. The local buckling performance test device for ultra-strong thin-walled steel pipes used for outdoor scaffolding according to claim 5, characterized in that: The pressure gauge (1) is configured to include a frame portion I (11), a telescopic cylinder portion (12), a tension gauge portion (13), a pull rope portion I (14), a pull rope portion II (15), a movable seat portion I (16), a column portion (17), an adjusting screw portion I (18), a sliding sleeve portion I (19), a sliding sleeve portion II (10) and an intermediate beam portion (101), and the sliding sleeve portion I (19) is configured to be sleeve-connected to one of the vertical portions of the frame portion I (11), and the sliding sleeve portion II (10) is configured to be sleeve-connected to the other vertical portion of the frame portion I (11). The vertical part is sleeve-type connected and one end face of the middle beam part (101) is set to be connected to the inner end face of the sliding sleeve part I (19), the other end face of the middle beam part (101) is set to be connected to the inner end face of the sliding sleeve part II (10), and the bottom end face of the shell of the telescopic cylinder part (12) is set to be connected to the middle of the upper end face of the lower transverse part of the frame part I (11), the top end face of the telescopic rod of the telescopic cylinder part (12) is set to be connected to the middle of the lower end face of the middle beam part (101), and the lower end face of the column part (17) is set to be connected to the lower end face of the middle beam part (101). The movable seat portion I (16) is configured to be connected to the middle outer side of the upper end face of the upper transverse portion of the frame portion I (11), the corner of the movable seat portion I (16) is configured to be sleeve-connected to the column portion (17), and the end of the adjusting screw portion I (18) is configured to be threadedly connected to the middle outer side of the upper transverse portion of the frame portion I (11), the upper end face of the adjusting screw portion I (18) is configured to be contact-connected to the outer side of the corner of the movable seat portion I (16), and one of the ends of the rope portion I (14) is configured to be connected to the middle of the middle beam portion (101), and the rope portion I (14 ) is configured to be connected to the lower end contact of the tension gauge part (13) and one end of the pull rope part II (15) is configured to be connected to the middle of the upper end of the tension gauge part (13), another end of the pull rope part II (15) is configured to be connected to the middle of the upper transverse part of the frame part I (11) and another end of the pull rope part II (15) is configured to be connected to the middle of the movable seat part I (16), the sliding sleeve part I (19) and the sliding sleeve part II (10) are respectively configured to be connected to the pressure rod support frame (5), Alternatively, the frame portion I (11) is configured as a rectangular frame having a through hole in the middle of the upper transverse portion and a threaded hole on the outer side of the middle of the upper transverse portion, and the threaded holes of the frame portion I (11) are configured to be distributed along the corners of the quadrilateral, the through holes of the frame portion I (11) are configured to be distributed along the center point of the quadrilateral, and the threaded holes of the frame portion I (11) are configured to be connected to the adjusting screw portion I (18), the through holes of the frame portion I (11) are configured to be connected to the pull rope portion II (15), and the telescopic cylinder portion (12) is configured to be an electric servo cylinder, the tension meter portion (13) is configured to be an electronic digital display tension meter, and the pull rope portion I (14) and the pull rope part II (15) are respectively set as steel wire ropes, the movable seat part I (16) is set as a rectangular block with a through hole body at the corner and the through hole body of the movable seat part I (16) is set to be connected with the column part (17), the column part (17) is set as a rod-shaped body and the adjusting screw part I (18) is set as a hexagonal bolt, the sliding sleeve part I (19) and the sliding sleeve part II (10) are respectively set as cylindrical bodies and the middle beam part (101) is set as a strip body, the four column parts (17) and the two adjusting screw parts I (18) are respectively set between the movable seat part I (16) and the frame part I (11), Alternatively, the clamp assembly (6) is configured to include a frame portion IV (61), a clamping shaft portion I (63), a clamping shaft portion II (64), a movable seat portion II (65) and an adjusting screw portion II (66), and a receiving hole body II (67) is provided at the lower end of the vertical portion of the frame portion IV (61), a receiving hole body III (68) is provided at the lower end face of the vertical portion of the frame portion IV (61), and a receiving hole body IV (69) is provided on the inner side of the vertical portion of the frame portion IV (61), a receiving hole body V (62) is provided at the movable seat portion II (65), and the end of the clamping shaft portion I (63) is configured to be connected to the receiving hole body IV (69), and the end of the clamping shaft portion II (64) is configured to be connected to the receiving hole body V (62). The connection and the accommodating hole body II (67) are set to be connected with the movable seat part II (65) in a sleeve-type manner, the accommodating hole body III (68) is set to be connected with the adjusting screw part II (66) in a threaded manner, and the end face of the adjusting screw part II (66) is set to be connected in a contact manner with the lower end face of the movable seat part II (65), the transverse part of the frame part IV (61) is respectively set to be connected with the first tailstock assembly (7) and the second tailstock assembly (8), and the clamping shaft part I (63) and the clamping shaft part II (64) are respectively set to be distributed corresponding to the central pressure rod (2), the first side pressure rod (3) and the second side pressure rod (4), and the clamping shaft part I (63) and the clamping shaft part II (64) are set to be connected in a clamping manner with the end head of the ultra-strong thin-walled steel pipe. Or, the frame part IV (61) is set as a C-shaped strip, and the clamping shaft part I (63) and the clamping shaft part II (64) are respectively set as middle-shaped rod bodies. The moving seat part II (65) is set as a block with groove bodies on its front and rear sides, and the groove body of the moving seat part II (65) is set to be connected to the vertical part of the frame part IV (61). The adjusting screw part II (66) is set as a hexagonal bolt, and the accommodating hole body II (67) is set as a long strip hole body. The accommodating hole body III (68) is set as a threaded hole body, and the inner port of the accommodating hole body III (68) is arranged on the lower inner wall of the accommodating hole body II (67). The accommodating hole body IV (69) and the accommodating hole body V (62) are respectively set as circular hole bodies. Or, the central pressure rod (2), the first side pressure rod (3), and the second side pressure rod (4) are respectively set as the rod part I (21), the screw rod part I (22), and the nut part I (23). The middle of the side surface of the rod part I (21) is set to be connected to the inner end face of the screw rod part I (22). The nut part I (23) is set to be threadedly connected to the screw rod part I (22), and the rod part I (21) is set to be embeddedly connected to the pressure rod support frame (5). The screw rod part I (22) is set to be recessedly connected to the pressure rod support frame (5), and the side surface of the rod part I (21) and the inner end face of the nut part I (23) are respectively set to be in contact connection with the pressure rod support frame (5). The lower end of the peripheral side surface of the rod part I (21) is set to be in contact connection with the ultra-strong thin-walled steel pipe. Or, the rod part I (21) is set as a circular shaft body, the screw rod part I (22) is set as a light column bolt, the nut part I (23) is set as a hexagonal bolt, and two screw rod parts I (22) are arranged on the rod part I (21). Alternatively, the strut support frame (5) is configured to include a rod portion II (53), a frame portion II (54), a rod portion III (55), a frame portion III (56), a plate portion (57), a screw rod portion II (58), and a nut portion II (59). A receiving groove body I (51) is provided at the lower end of the vertical portion of the frame portion II (54), a receiving groove body II (52) is provided at the lower end of the vertical portion of the frame portion III (56), and a receiving hole body I (50) is provided in the plate portion (57). The inner end face of the rod portion II (53) is configured to be connected to the upper side of the inner end face of the frame portion II (54), and the end of the rod portion III (55) is configured to be rotatably connected to the upper side of the vertical portion of the frame portion III (56). The end face of the rod portion III (55) is configured to be connected to the upper side of the inner end face of the vertical portion of the frame portion II (54), and the inner end face of the plate portion (57) is configured to be connected to the middle of the outer side face of the vertical portion of the frame portion II (54). The inner end face of the screw rod portion II (58) is configured to be connected to the middle of the outer end face of the vertical portion of the frame portion III (56), and the screw rod portion II (58) is configured to be connected to the receiving hole body I (50). The nut portion II (59) is configured to be threadedly connected to the screw rod portion II (58), and the inner end face of the nut portion II (59) is configured to be in contact connection with the outer end face of the plate portion (57). The receiving groove body I (51) and the frame portion II (54) are respectively configured to be connected to the central strut (2), and the receiving groove body II (52) and the frame portion III (56) are respectively configured to be connected to the first side strut (3) and the second side strut (4). The outer end of the rod portion II (53) is configured to be connected to the pressure gauge (1). Alternatively, the rod portion II (53) is configured to be a rod-shaped body with a U-shaped outer end, and the frame portion II (54) and the frame portion III (56) are respectively configured to be U-shaped strip-shaped bodies. The rod portion III (55) is configured to be a shaft-shaped body, and the plate portion (57) is configured to be a C-shaped sheet body. The screw rod portion II (58) is configured to be a smooth shaft bolt, and the nut portion II (59) is configured to be a hexagonal nut. The receiving groove body I (51) and the receiving groove body II (52) are respectively configured to be U-shaped opening bodies, and the receiving hole body I (50) is configured to be a C-shaped long hole body. One plate portion (57), one screw rod portion II (58), and one nut portion II (59) are configured to form a set of plate-rod components, and at least two sets of plate-rod components are provided between the frame portion III (56) and the frame portion II (54). Or, the first tailstock assembly (7) is configured to include a support seat portion I (71), a crossbeam portion I (72) and a support plate portion I (73), and a leakage window body I (74) is provided at the lower end of the support seat portion I (71), a leakage window body II (75) is provided at the upper end of the support seat portion I (71), and a receiving hole body VI (76) is provided at the outer end face of the crossbeam portion I (72), a receiving hole body VII (77) is provided at the outer end head of the crossbeam portion I (72), and the inner end face of the crossbeam portion I (72) is configured to be connected to the middle of the inner end face of the support seat portion I (71), the cross end face of the support plate portion I (73) is configured to be connected to the lower side of the outer end face of the support seat portion I (71), and the inner side of the lower end face of the crossbeam portion I (72) is configured to be connected to the clamp assembly ( 6) connection, the support plate part I (73) and the support seat part I (71) are set to be accommodated and connected with the stress measuring instrument (9), and the lower side of the outer end face of the support seat part I (71), the inner end face of the vertical part of the support plate part I (73) and the upper end face of the horizontal part of the support plate part I (73) are respectively set to be contact-connected with the stress measuring instrument (9), the leakage window body I (74) and the leakage window body II (75) are respectively set to be connected with the support leg (91), and the accommodating hole body VI (76) is set to be connected with the second tailstock assembly (8), the accommodating hole body VII (77) is set to be connected with the docking screw nut (92), and the outer side of the upper end face of the cross beam part I (72) and the outer side of the lower end face of the cross beam part I (72) are respectively set to be contact-connected with the docking screw nut (92), Alternatively, the support seat portion I (71) is configured as a plate-like body and the crossbeam portion I (72) is configured as a rectangular rod-like body, the support plate portion I (73) is configured as an L-shaped sheet-like body and the leakage window body I (74) and the leakage window body II (75) are configured as rectangular hole-like bodies, the receiving hole body VI (76) is configured as a rectangular blind hole and the receiving hole body VII (77) is configured as a strip hole-like body, Alternatively, the second tailstock assembly (8) is configured to include a support seat portion II (81), a crossbeam portion II (82) and a support plate portion II (83), and a leakage window body III (84) is provided at the lower end of the support seat portion II (81), a leakage window body IV (85) is provided at the upper end of the support seat portion II (81), and a receiving hole body VII (86) is provided at the contraction body of the crossbeam portion I (72), the inner end face of the crossbeam portion II (82) is configured to be connected to the middle of the inner end face of the support seat portion II (81), the cross end face of the support plate portion II (83) is configured to be connected to the lower side of the outer end face of the support seat portion II (81), and the inner end face of the lower end face of the crossbeam portion II (82) is configured to be connected to the lower side of the outer end face of the support seat portion II (81), and the inner end face of the lower end face of the crossbeam portion II (82) is configured to be connected to the lower side of the outer end face of the support seat portion II (81). The side is set to be connected with the clamp assembly (6), the support plate part II (83) and the support seat part II (81) are set to be connected in an accommodating manner with the stress measuring instrument (9), and the lower side of the outer end surface of the support seat part II (81), the inner end surface of the vertical part of the support plate part II (83) and the upper end surface of the horizontal part of the support plate part II (83) are respectively set to be connected in a contact manner with the stress measuring instrument (9), the leakage window body III (84) and the leakage window body IV (85) are respectively set to be connected with the support leg (91) and the contraction body of the crossbeam part I (72) is set to be connected in a through-type manner with the first tailstock assembly (7), and the accommodating hole body VII (86) is set to be connected with the docking screw nut (92). Alternatively, the support seat portion II (81) is configured as a plate-like body and the cross beam portion II (82) is configured as a convex rod-like body having a rectangular cross section, the support plate portion II (83) is configured as an L-shaped sheet-like body and the leakage window body III (84) and the leakage window body IV (85) are configured as rectangular hole-like bodies, and the receiving hole body VII (86) is configured as a hole-like body. Alternatively, the screw of the docking screw nut (92) is respectively arranged to be connected to the first tailstock assembly (7) and the second tailstock assembly (8) in a through-type manner, and the screw flange of the docking screw nut (92) and the nut inner end surface of the docking screw nut (92) are respectively arranged to be connected to the first tailstock assembly (7) in a contact manner, the screw of the docking screw nut (92) is arranged to be a hexagonal bolt, and the nut of the docking screw nut (92) is arranged to be a hexagonal nut, Alternatively, the support leg (91) is configured to include a top plate portion (911), a screw portion (912) and a leg portion (913), and a receiving hole body VIII (914) is provided on the top plate portion (911), and the outer side of the lower end surface of the top plate portion (911) is configured to be connected to the upper end surface of the leg portion (913), the end of the screw portion (912) is configured to be connected to the receiving hole body VIII (914) in a through-type manner, and the outer end of the screw portion (912) is configured to be threadedly connected to the first tailstock assembly (7) and the second tailstock assembly (8), respectively, the upper end surface of the top plate portion (911) is configured to be contact-connected to the first tailstock assembly (7) and the second tailstock assembly (8), respectively, and the flange of the screw portion (912) is configured to be contact-connected to the lower end surface of the top plate portion (911), Alternatively, the top plate portion (911) is configured as a sheet-like body and the screw portion (912) is configured as a hexagonal bolt, the leg portion (913) is configured as a rod-like body and the receiving hole body VIII (914) is configured as a long hole-like body, and the angle α between the top plate portion (911) and the leg portion (913) is configured as 100-120°. Alternatively, the stress measuring instrument (9) is configured as an X-ray stress measuring instrument and the stress measuring instrument (9) is configured to be immersed in connection with the first tailstock assembly (7) and the second tailstock assembly (8), respectively, and the probe of the stress measuring instrument (9) is configured to be connected with the super-strong thin-walled steel pipe.
7. The local buckling performance test device for ultra-strong thin-walled steel pipes for outdoor scaffolding according to any one of claims 1 to 6, characterized in that: The pressure gauge (1) and the central pressure rod (2), the first side pressure rod (3), the second side pressure rod (4), the pressure rod support frame (5) and the clamp assembly (6) are arranged to be distributed in a manner of anti-bending measurement, and the pressure gauge (1), the central pressure rod (2), the first side pressure rod (3), the second side pressure rod (4), the pressure rod support frame (5) and the clamp assembly (6) and the stress measuring instrument (9) are arranged to be distributed in a manner of residual stress measurement, and the pressure gauge (1), the central pressure rod (2), the first side pressure rod (3), the second side pressure rod (4), the pressure rod support frame (5) and the clamp assembly (6) and the first tailstock assembly (7), the second tailstock assembly (8), the support legs (91) and the docking screw nut (92) are arranged to be distributed in a manner of adjustable frame support, Or, at least one first side pressure rod (3) and at least one second side pressure rod (4) are respectively arranged on the pressure rod support frame (5), at least one docking screw nut (92) is arranged between the first tailstock assembly (7) and the second tailstock assembly (8), the top plate portion (911) is respectively arranged to be in contact with the upper hole wall of the leakage window body III (84), the upper hole wall of the leakage window body IV (85), the upper hole wall of the leakage window body I (74) and the upper hole wall of the leakage window body II (75), and the screw portion (912) is respectively arranged to be in contact with the upper hole wall of the leakage window body III (84), the upper hole wall of the leakage window body IV (85) , the upper hole wall of the leakage window body I (74) and the upper hole wall of the leakage window body II (75) are threadedly connected, the crossbeam part II (82) is configured to be connected to the accommodating hole body VI (76), the frame part IV (61) is configured to be connected to the crossbeam part I (72) and the crossbeam part II (82), the screw part I (22) is configured to be connected to the accommodating trough body I (51) and the accommodating trough body II (52), the rod part I (21) and the nut part I (23) are configured to be connected to the frame part II (54) and the frame part III (56), and the rod part II (53) is configured to be connected to the sliding sleeve part I (19) and the sliding sleeve part II (10).
8. The local buckling performance test device for ultra-strong thin-walled steel pipes for outdoor scaffolding according to claim 7, characterized in that: The diameter of the rod portion I (21) on the central pressure rod (2) is set to be distributed in a differential manner with the diameter of the rod portion I (21) on the first side pressure rod (3) and the diameter of the rod portion I (21) on the second side pressure rod (4).
9. A method for testing the local buckling performance of ultra-strong thin-walled steel pipes used for outdoor scaffolding, characterized by the following steps: The pressure gauge (1) drives the pressure rod group to apply pressure to the ultra-strong thin-walled steel pipe, the clamp assembly (6) clamps and fixes the end of the ultra-strong thin-walled steel pipe, and the pressure rod group applies bending pressure to dispersed parts of the ultra-strong thin-walled steel pipe, thereby placing the ultra-strong thin-walled steel pipe in a local buckling performance test state in a downward pressure action area.
10. The local buckling performance test method for ultra-strong thin-walled steel pipes used for outdoor scaffolding according to claim 1, characterized in that the steps are: When it is necessary to conduct a local buckling performance test on the ultra-strong thin-walled steel pipe used for the external working scaffold, the contraction body of the crossbeam part I (72) is moved in the receiving hole body VI (76) according to the length of the ultra-strong thin-walled steel pipe, so that the support seat part II (81) and the leg part (913) located on the second tailstock assembly (8) are moved on the test foundation surface, and the distance between the clamp assembly (6) located on the first tailstock assembly (7) and the clamp assembly (6) located on the second tailstock assembly (8) is adjusted so that the distance between the clamp assembly (6) located on the first tailstock assembly (7) and the clamp assembly (6) located on the second tailstock assembly (8) corresponds to the length of the ultra-strong thin-walled steel pipe, and the screw of the docking screw nut (92) is placed in the receiving hole body VI (76). In the receiving hole body VII (77) and the receiving hole body VII (86), the nut of the docking screw nut (92) is rotated on the screw of the docking screw nut (92), so that the screw flange body of the docking screw nut (92) and the inner end face of the nut of the docking screw nut (92) act on the outer side of the end face of the cross beam part I (72) respectively, thereby connecting the first tailstock assembly (7) and the second tailstock assembly (8) together, aligning the center line of the ultra-strong thin-walled steel pipe with the center pressure rod (2), placing one end of the ultra-strong thin-walled steel pipe between the clamping shaft part I (63) and the clamping shaft part II (64) on the first tailstock assembly (7), and placing the other end of the ultra-strong thin-walled steel pipe between the clamping shaft part I (63) and the clamping shaft part II (64) on the second tailstock assembly (8). Ⅰ (63) and the clamping shaft part Ⅱ (64), so that the adjusting screw part Ⅱ (66) rotates in the accommodating hole body Ⅲ (68), so that the movable seat part Ⅱ (65) moves upward in the accommodating hole body Ⅱ (67), driving the clamping shaft part Ⅱ (64) to move upward, so that the clamping shaft part Ⅰ (63) and the clamping shaft part Ⅱ (64) clamp the end of the ultra-strong thin-walled steel pipe, thereby installing the ultra-strong thin-walled steel pipe between the clamping assembly (6), so that the frame part Ⅲ (56) rotates on the rod part Ⅲ (55), so that the screw part Ⅱ (58) moves in the accommodating hole body Ⅰ (50), and the swing angle of the frame part Ⅲ (56) on the rod part Ⅲ (55) is adjusted, so that the angle between the accommodating tank body Ⅱ (52) and the accommodating tank body Ⅰ (51) is aligned with the first side. The span distance between the pressure rod (3) and the second side pressure rod (4) corresponds to the center pressure rod (2), so that the nut part II (59) rotates on the screw part II (58), so that the inner end surface of the nut part II (59) acts on the outer end surface of the plate part (57), and the rod part I (21) located at the center pressure rod (2) is placed in the frame part II (54), and the screw part I (22) located at the center pressure rod (2) is placed in the accommodating groove body I (51), so that the nut part I (23) rotates on the screw part I (22), so that the inner end surface of the nut part I (23) located at the center pressure rod (2) acts on the frame part II (54), and the rod part I (21) located at the first side pressure rod (3) and the second side pressure rod (4) is placed in the frame part III (56).The screw rod part I (22) located at the first side pressure rod (3) and the second side pressure rod (4) is placed in the receiving groove body II (52), and the nut part I (23) is rotated on the screw rod part I (22), so that the inner end surface of the nut part I (23) located at the first side pressure rod (3) and the second side pressure rod (4) acts on the frame part III (56), thereby installing the central pressure rod (2), the first side pressure rod (3) and the second side pressure rod (4) on the pressure rod support frame (5), installing the probe of the stress measuring instrument (9) on the super-strong thin-walled steel pipe, and putting the telescopic cylinder part (12) in the working state, putting the telescopic cylinder part (12) in the telescopic state, and driving The sliding sleeve part I (19) and the sliding sleeve part II (10) are respectively moved downward on the vertical part of the frame part I (11), driving the rod part II (53) to move downward. When the rod part I (21) located on the central pressure rod (2) contacts the ultra-strong thin-walled steel pipe, the telescopic cylinder part (12) is in a non-working state, and the adjusting screw part I (18) is rotated in the threaded hole body of the frame part I (11), and the position of the moving seat part I (16) on the column part (17) is adjusted. By moving the seat part I (16) and the pull rope part II (15), the tension meter part (13) is driven to move, and the tension meter part (13) is calibrated to the initial value. After the initial value of the tension gauge (13) is corrected, the telescopic cylinder (12) is put into working state, and the telescopic cylinder (12) is extended and retracted, so that the rod part I (21) located on the central pressure rod (2), the rod part I (21) located on the first side pressure rod (3) and the rod part I (21) located on the second side pressure rod (4) act on the ultra-strong thin-walled steel pipe respectively, and a downward pressure is applied to the ultra-strong thin-walled steel pipe through the rod part I (21), and a local buckling performance test is performed on the ultra-strong thin-walled steel pipe. The anti-bending pressure value and the anti-damage pressure value of the ultra-strong thin-walled steel pipe are obtained through the initial value and the end value of the tension gauge (13). The force measuring instrument (9) obtains the residual stress value of the ultra-strong thin-walled steel pipe. After the local buckling performance test of the ultra-strong thin-walled steel pipe used for the external work scaffold is completed, the telescopic cylinder part (12) is in an extended state, the rod part I (21) is separated from the ultra-strong thin-walled steel pipe, the adjusting screw part II (66) is rotated in the opposite direction in the receiving hole body III (68), the movable seat part II (65) is moved downward in the receiving hole body II (67), the clamping shaft part I (63) and the clamping shaft part II (64) are separated from the end of the ultra-strong thin-walled steel pipe, and the end of the ultra-strong thin-walled steel pipe is taken out from the clamping shaft part I (63) and the clamping shaft part II (64). Or, the steps are: The center pressure rod (2) is mounted on the frame part II (54), and the telescopic cylinder part (12) is in a telescopic state, so that the rod part I (21) on the center pressure rod (2) contacts the ultra-strong thin-walled steel pipe. According to the diameter of the rod part I (21), the rod part I (21) on the first side pressure rod (3) and the rod part I (21) on the second side pressure rod (4) corresponding to the span distance between the first side pressure rod (3) and the second side pressure rod (4) and the center pressure rod (2) are selected. The first side pressure rod (3) The center pressure rod (2), the first side pressure rod (3) and the second side pressure rod (4) are installed on the frame portion III (56), the rod portion I (21) located on the first side pressure rod (3) and the rod portion I (21) located on the second side pressure rod (4) are respectively in contact with the ultra-strong thin-walled steel pipe, so that the nut portion II (59) rotates on the screw portion II (58), so that the inner end surface of the nut portion II (59) acts on the outer end surface of the plate portion (57), thereby installing the center pressure rod (2), the first side pressure rod (3) and the second side pressure rod (4) on the pressure rod support frame (5).