A steel structure support

Abstract

The present invention relates to the technical field of brackets, and discloses a steel structure bracket, including a threaded adjustment mechanism, a pneumatic limiting mechanism and a fixed limiting mechanism, wherein an arc-shaped limiting plate located in a fixed state on the periphery of an inner rack structure and an outer rack structure arranged on the inner concave surface of the arc-shaped limiting plate and capable of meshing with the inner rack structure are arranged inside the steel structure bracket. The steel structure bracket utilizes the mobility of the threaded structure to realize the height adjustable support function of the supporting steel plate, and during operation, the device can produce a rotation damping effect on the threaded structure, thereby effectively preventing the loosening phenomenon between the inner threaded structure and the outer threaded structure caused by mechanical vibration. In addition, the damping between the threaded structures of the device is elastic damping, thereby increasing the limiting range of the threaded structure, thereby improving the stability of the device during operation.

Description

Technical Field

[0001] The present invention relates to the technical field of supports, in particular to a steel structure support. Background Art

[0002] Steel structure is a commonly used structure in construction. The high strength and convenient construction advantages of steel structure make it more secure when supporting equipment or components on the construction site. In the construction process, steel structure supports are also needed. Workers can stand on the steel structure supports to perform construction operations at higher positions, which increases convenience.

[0003] For example, the Chinese patent with publication number "CN220580452U" discloses "a steel structure bracket", whose main structure includes a support column, a support ring, a limit groove, a screw rod, a limit block, an adjustment mechanism, a protective shell, a drive mechanism and a support plate. The steel structure bracket has the advantages of adjustable height, etc. The drive mechanism is used to drive the adjustment mechanism to operate, and then the adjustment mechanism drives the screw rod to move in the direction of the screw rod itself, driving the support plate to move, thereby adjusting the position of the support plate, so that the height of the steel structure bracket is adjusted, solving the problem that the current steel structure bracket is fixed and cannot be adjusted.

[0004] However, when the above steel structure bracket is actually working, since the equipment is in working state, under the influence of mechanical vibration, it will cause loosening between the threaded structures, resulting in poor support stability for the support plate. Therefore, its working stability is relatively poor. Summary of the Invention

[0005] In response to the shortcomings of the existing technology, the present invention provides a steel structure bracket that utilizes the mobility of the threaded structure to achieve a height-adjustable support function for the supporting steel plate. During operation, the device can produce a rotational damping effect on the threaded structure, thereby effectively preventing loosening between the internal threaded structure and the external threaded structure caused by mechanical vibration. In addition, the damping between the threaded structures of the device is elastic damping, thereby increasing the restriction range of the threaded structure, thereby improving the stability of the equipment during operation, and solving the above-mentioned technical problems.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a steel structure bracket, comprising a bottom support base, an inwardly recessed mounting groove arranged at the center of the upper end surface of the bottom support base, a rod fixing groove arranged at the center of the inwardly recessed mounting groove, a support steel plate located directly above the bottom support base, a hollow support rod located below the four corners of the support steel plate, a longitudinal component movable cavity arranged inside the hollow support rod, an inner movable plate placed inside the longitudinal component movable cavity, a longitudinal telescopic rod fixedly mounted on the upper end surface of the inner movable plate and with the top end fixedly mounted on the bottom surface of the support steel plate, and a longitudinal telescopic rod placed at the bottom of the inner movable plate. The invention relates to a pneumatic limiting mechanism, wherein the pneumatic limiting mechanism comprises a special-shaped sleeve located on the periphery of the external threaded sleeve, an inner limiting protrusion arranged on the inner circumferential surface of the special-shaped sleeve, a sheet-like rubber bag embedded in one side of the inner limiting protrusion and expanding after being subjected to gas pressure, and abutting against one side of the outer limiting protrusion, and an inner rack structure arranged on the outer circumferential surface of the special-shaped sleeve; and a fixed limiting mechanism, wherein the pneumatic limiting mechanism comprises an arc-shaped limiting plate located on the periphery of the inner rack structure in a fixed state, and an outer rack structure arranged on the inner concave surface of the arc-shaped limiting plate and capable of engaging with the inner rack structure.

[0007] Preferably, the threaded adjustment mechanism includes an externally threaded sleeve, the bottom periphery of the externally threaded sleeve is installed in the concave mounting groove through a bearing, the center of the externally threaded sleeve is provided with an internally threaded hole with openings at both ends, the externally threaded sleeve is provided with a threaded support rod installed in the internally threaded hole through a threaded structure, the top of the threaded support rod is provided with a mounting head which is an integral structure with it and is fixedly installed on the bottom of the No. 1 fixing plate, the interior of the threaded support rod is provided with a polygonal limiting hole which is open at the bottom end, the interior of the polygonal limiting hole is inserted with a polygonal limiting rod, and the bottom end of the polygonal limiting rod is fixedly installed inside the rod body fixing groove, and the outer circumferential surface of the externally threaded sleeve is provided with a plurality of external limiting protrusions which are an integral structure with it.

[0008] Preferably, the thread structure includes an internal thread structure provided on the inner circumferential wall of the external thread sleeve and an external thread structure provided on the outer circumferential surface of the threaded support rod, and the internal thread structure matches the external thread structure.

[0009] Preferably, the structural shape of the polygonal limiting hole longitudinal section is consistent with the structural shape of the polygonal limiting rod longitudinal section, both are polygonal structures, and the structural dimensions of the polygonal limiting hole longitudinal section match the structural dimensions of the polygonal limiting rod longitudinal section.

[0010] Preferably, the pneumatic limiting mechanism includes a special-shaped sleeve, the center of the special-shaped sleeve is provided with an inner sleeve hole structure that can be sleeved on the periphery of the outer limiting protrusion, the inner circumferential surface of the special-shaped sleeve is provided with a plurality of inner limiting protrusions that are integral with the special-shaped sleeve, each of the inner limiting protrusions is provided with a closed gas reserved cavity inside, and the plurality of gas reserved cavities are connected through an annular cavity, and one side of each of the inner limiting protrusions is provided with a strip-shaped embedding port connecting the gas reserved cavity and the inner sleeve hole structure, and a sheet rubber bag is closed and embedded in the interior of each of the strip embedding ports, the outer circumferential surface of the special-shaped sleeve is provided with a plurality of inner rack structures that are integral with the special-shaped sleeve, the upper end face of the special-shaped sleeve is provided with an inflation channel that is integral with the special-shaped sleeve and connected to the annular cavity, and an air valve is installed inside the inflation channel.

[0011] Preferably, the number of the inner limiting protrusions is the same as the number of the outer limiting protrusions.

[0012] Preferably, when the inner limiting protrusion is inserted into the gap between the two outer limiting protrusions, a mechanical gap is still retained between the adjacent inner limiting protrusions and the outer limiting protrusions.

[0013] Preferably, the sheet-like rubber bag is made of a rubber material with elastic reset function.

[0014] Preferably, the fixed limiting mechanism includes an annular fixing plate fixedly mounted on the upper surface of the bottom support base, an outer sleeve release hole is provided in the center of the annular fixing plate, an upper end surface of the annular fixing plate is provided with an arc-shaped limiting plate integrally formed with it, and an inner concave surface of the arc-shaped limiting plate is provided with a plurality of outer rack structures integrally formed with it.

[0015] Preferably, the outer rack structure is capable of engaging with the inner rack structure.

[0016] Compared with the prior art, the present invention provides a steel structure bracket with the following beneficial effects:

[0017] 1. The mobility of the threaded structure is used to achieve the height-adjustable support function for the supporting steel plate. During operation, the device can produce a rotational damping effect on the threaded structure, thereby effectively preventing the loosening between the internal and external threaded structures caused by mechanical vibration. In addition, the damping between the threaded structures of the device is elastic damping, thereby increasing the restriction range of the threaded structure and further improving the stability of the equipment during operation.

[0018] 2. By setting up a threaded adjustment mechanism, when the support height needs to be adjusted, the external threaded sleeve is rotated in a certain direction. Due to the function of the threaded structure and the polygonal limit rod, the threaded support rod can drive the No. 1 fixed plate to move longitudinally. By controlling the rotation direction, the longitudinal movement direction of the No. 1 fixed plate can be controlled until the height of the support steel plate is adjusted to the appropriate position;

[0019] 3. By setting up a pneumatic limit mechanism and using an inflation device to inject gas into the inflation channel, the sheet rubber bag will expand outward under the influence of the air pressure until the sheet rubber bag hits the corresponding side of the outer limit boss with a certain pressure and remains stable. At this time, the gas pressure will exert pressure on the outer limit boss through the sheet rubber bag, thereby generating a pre-tightening force on the external threaded sleeve, thereby preventing it from loosening under vibration;

[0020] 4. By setting a fixed limiting mechanism, after completing the height adjustment, the special-shaped sleeve is inserted into the concave area of ​​the arc-shaped limiting plate, and the outer rack structure and the inner rack structure are in a meshing state, and the height is manually maintained. Finally, under the reaction of the gas and the meshing force of the outer rack structure and the inner rack structure, it can be in a fixed position, thereby playing a limiting function for the special-shaped sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A perspective view of the present invention;

[0022] Figure 2 It is a three-dimensional cross-sectional view of the central area of ​​the present invention;

[0023] Figure 3 It is a three-dimensional cross-sectional view of the edge area of ​​the present invention;

[0024] Figure 4 A three-dimensional diagram of the threaded adjustment mechanism of the present invention;

[0025] Figure 5 is a three-dimensional cross-sectional view of the threaded adjustment mechanism of the present invention;

[0026] Figure 6 A three-dimensional diagram of the pneumatic limiting mechanism of the present invention;

[0027] Figure 7 It is a three-dimensional cross-sectional view of the pneumatic limiting mechanism of the present invention;

[0028] Figure 8 It is a three-dimensional diagram of the fixed limiting mechanism in the present invention.

[0029] Among them: 1. Bottom support base; 2. Concave mounting groove; 3. Rod body fixing groove; 4. No. 1 fixing plate; 5. Threaded adjustment mechanism; 51. External threaded sleeve; 52. Internal threaded hole; 53. External limit boss; 54. Threaded support rod; 55. Threaded structure; 56. Mounting head; 57. Polygonal limit hole; 58. Polygonal limit rod; 6. Pneumatic limit mechanism; 61. Special-shaped sleeve; 62. Internal sleeve hole structure; 63. Internal limit Raised platform; 64. Gas reserved cavity; 65. Annular cavity; 66. Strip-shaped embedding port; 67. Sheet-shaped rubber bag; 68. Inner rack structure; 69. Inflating channel; 7. Fixed limiting mechanism; 71. Annular fixing plate; 72. Outer sleeve release hole; 73. Arc-shaped limiting plate; 74. Outer rack structure; 8. Support steel plate; 9. Hollow support rod; 10. Longitudinal component movable cavity; 11. Inner movable plate; 12. Longitudinal telescopic rod; 13. Coil spring. DETAILED DESCRIPTION

[0030] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0031] See also Figure 1 、 Figure 2 and Figure 3 The support frame 1 is a bottom support frame 1, a concave mounting groove 2 arranged at the center of the upper end surface of the bottom support base 1, a rod fixing groove 3 arranged at the center of the concave mounting groove 2, a supporting steel plate 8 located directly above the bottom support base 1, a hollow supporting rod 9 located below the four corners of the supporting steel plate 8, a longitudinal component movable cavity 10 arranged inside the hollow supporting rod 9, an inner movable plate 11 placed inside the longitudinal component movable cavity 10, a longitudinal telescopic rod 12 fixedly mounted on the upper end surface of the inner movable plate 11 and with the top fixedly mounted on the bottom surface of the supporting steel plate 8, and a coil spring 13 placed at the bottom of the inner movable plate 11 and having an elastic supporting effect. After the supporting steel plate 8 rises to a suitable height, it can play an effective supporting function. At the same time, the coil spring 13 produces an upward elastic supporting effect on the inner movable plate 11, and the inner movable plate 11 produces an upward supporting effect on the supporting steel plate 8 through the longitudinal telescopic rod 12, thereby improving the supporting stability of the supporting steel plate 8 at the edge.

[0032] To adjust the support height, please refer to Figure 2 、 Figure 3 、 Figure 4 and Figure 5, it is necessary to set up a threaded adjustment mechanism 5, which is internally provided with a threaded support rod 54 that can generate longitudinal movement and drive the No. 1 fixed plate 4 to move, a polygonal limiting rod 58 located in the center of the threaded support rod 54 and capable of preventing the threaded support rod 54 from rotating, an externally threaded sleeve 51 installed on the periphery of the threaded support rod 54 through a threaded structure 55, and an external limiting protrusion 53 located on the circumferential surface of the externally threaded sleeve 51. When it is necessary to adjust the support height, the externally threaded sleeve 51 is rotated in a direction. Due to the action of the threaded structure 55 and the polygonal limiting rod 58, the threaded support rod 54 can drive the No. 1 fixed plate 4 to move longitudinally. By controlling the rotation direction, the longitudinal movement direction of the No. 1 fixed plate 4 can be controlled until the height of the support steel plate 8 is adjusted to a suitable position.

[0033] For the specific structure of the threaded adjustment mechanism 5, please refer to Figure 4 and Figure 5 , including an externally threaded sleeve 51, the bottom periphery of the externally threaded sleeve 51 is installed in the concave mounting groove 2 through a bearing, the center of the externally threaded sleeve 51 is provided with an internally threaded hole 52 with openings at both ends, the externally threaded sleeve 51 is provided with a threaded support rod 54 through a threaded structure 55 in the internally threaded hole 52, wherein the threaded structure 55 includes an internally threaded structure provided on the inner wall of the circumference of the externally threaded sleeve 51 and an externally threaded structure provided on the outer circumferential surface of the threaded support rod 54, and the internally threaded structure matches the externally threaded structure, and the top of the threaded support rod 54 is provided with a mounting head 56 which is an integral structure therewith and fixedly mounted on the bottom of the No. 1 fixing plate 4, The interior of the threaded support rod 54 is provided with a polygonal limiting hole 57 with an opening at the bottom end, and a polygonal limiting rod 58 is inserted into the interior of the polygonal limiting hole 57. In order to prevent the component from rotating on its own, it is necessary to make the structural shape of the longitudinal section of the polygonal limiting hole 57 consistent with the structural shape of the longitudinal section of the polygonal limiting rod 58, both of which are polygonal structures, and the structural dimensions of the longitudinal section of the polygonal limiting hole 57 match the structural dimensions of the longitudinal section of the polygonal limiting rod 58, and the bottom end of the polygonal limiting rod 58 is fixedly installed inside the rod body fixing groove 3, and the outer circumferential surface of the externally threaded sleeve 51 is provided with a plurality of external limiting protrusions 53 with an integral structure therewith.

[0034] In order to generate a pre-tightening force on the external threaded sleeve 51 to prevent it from loosening under vibration, please refer to Figure 1 、 Figure 2 、 Figure 3 、 Figure 6 and Figure 7, it is necessary to set up a pneumatic limit mechanism 6, which is internally provided with a special-shaped sleeve 61 located on the periphery of the external threaded sleeve 51, an inner limit boss 63 set on the inner circumferential surface of the special-shaped sleeve 61, a sheet rubber bag 67 embedded in one side of the inner limit boss 63 and expanding after being subjected to gas pressure, and abutting against one side of the outer limit boss 53, and an inner rack structure 68 set on the outer circumferential surface of the special-shaped sleeve 61. After the adjustment of the abutment support of the No. 1 fixing plate 4 is completed, an inflation device is used to inject gas into the inflation channel 69. Under the influence of air pressure, the sheet rubber bag 67 will expand outward until the sheet rubber bag 67 abuts against the corresponding side of the outer limit boss 53 with a certain pressure and remains stable. At this time, the gas pressure will apply pressure to the outer limit boss 53 through the sheet rubber bag 67, thereby generating a pre-tightening force on the external threaded sleeve 51, thereby preventing it from loosening under vibration.

[0035] For the specific structure of the pneumatic limiting mechanism 6, please refer to Figure 6 and Figure 7 , including a special-shaped sleeve 61, the center of the special-shaped sleeve 61 is provided with an inner sleeve hole structure 62 that can be sleeved on the periphery of the outer limiting protrusion 53, and the inner circumferential surface of the special-shaped sleeve 61 is provided with multiple inner limiting protrusions 63 with its integral structure. In order to have correspondence, it is necessary to make the inner limiting protrusions 63 inserted into the gap between the two outer limiting protrusions 53, and there is still a mechanical gap between the adjacent inner limiting protrusions 63 and the outer limiting protrusions 53. The number of the inner limiting protrusions 63 is consistent with the number of the outer limiting protrusions 53, and each of the inner limiting protrusions 63 is provided with a closed gas reserved cavity 64. The gas reserved cavities 64 are connected through the annular cavity 65. One side of each of the inner limit protrusions 63 is provided with a strip-shaped embedding port 66 connecting the gas reserved cavity 64 and the inner sleeve hole structure 62. A sheet rubber bag 67 is enclosed and embedded in the interior of each of the strip-shaped embedding ports 66. In order to have the reset capability, the sheet rubber bag 67 needs to be made of a rubber material with an elastic reset function. The outer circumferential surface of the special-shaped sleeve 61 is provided with a plurality of inner rack structures 68 with an integral structure therewith. The upper end face of the special-shaped sleeve 61 is provided with an inflation channel 69 with an integral structure therewith and connected to the annular cavity 65, and an air valve is installed inside the inflation channel 69.

[0036] In order to limit the special-shaped sleeve 61, please refer to Figure 1 、 Figure 2 、 Figure 3 and Figure 8, it is necessary to set up a fixed limiting mechanism 7, which is internally provided with an arc-shaped limiting plate 73 located in a fixed state on the periphery of the inner rack structure 68, and an outer rack structure 74 arranged on the inner concave surface of the arc-shaped limiting plate 73 and capable of engaging with the inner rack structure 68. When the height adjustment is completed, the special-shaped sleeve 61 is inserted into the inner concave area of ​​the arc-shaped limiting plate 73, and the outer rack structure 74 and the inner rack structure 68 are in an engaged state, and the height is manually maintained. Finally, under the reaction of the gas and the meshing force of the outer rack structure 74 and the inner rack structure 68, it can be in a fixed position, thereby playing a limiting function for the special-shaped sleeve 61.

[0037] For the specific structure of the fixed limiting mechanism 7, please refer to Figure 8 , including an annular fixing plate 71 fixedly mounted on the upper surface of the bottom support base 1, the center of the annular fixing plate 71 is provided with an outer sleeve release hole 72, the upper end surface of the annular fixing plate 71 is provided with an arc-shaped limiting plate 73 with an integral structure therewith, and the inner concave surface of the arc-shaped limiting plate 73 is provided with a plurality of outer rack structures 74 with an integral structure therewith, and the outer rack structure 74 can engage with the inner rack structure 68.

[0038] The specific working principle of the present invention is that when the support height needs to be adjusted, the external threaded sleeve 51 is rotated in a directional manner. Due to the action of the threaded structure 55 and the polygonal limiting rod 58, the threaded support rod 54 can drive the first fixing plate 4 to move longitudinally. By controlling the rotation direction, the longitudinal movement direction of the first fixing plate 4 can be controlled until the height of the support steel plate 8 is adjusted to the appropriate position.

[0039] Insert the special-shaped sleeve 61 into the concave area of ​​the arc-shaped limit plate 73, and make the outer rack structure 74 and the inner rack structure 68 in a meshing state, and manually maintain the height;

[0040] An inflating device is used to inject gas into the inflating channel 69. Under the influence of the gas pressure, the sheet rubber bladder 67 expands outward until the sheet rubber bladder 67 contacts the corresponding side of the outer limit boss 53 with a certain pressure and remains stable. At this time, the gas pressure exerts pressure on the outer limit boss 53 through the sheet rubber bladder 67, thereby generating a pre-tightening force on the outer threaded sleeve 51.

[0041] After the support steel plate 8 rises to a suitable height, it can play an effective supporting function. At the same time, the coil spring 13 produces an upward elastic supporting effect on the inner movable plate 11, and the inner movable plate 11 produces an upward supporting effect on the support steel plate 8 through the longitudinal telescopic rod 12, thereby improving the supporting stability of the support steel plate 8 at the edge.

[0042] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A steel structure support, comprising a bottom support base (1), a recessed mounting groove (2) arranged at the center of the upper end surface of the bottom support base (1), a rod body fixing groove (3) arranged at the center of the recessed mounting groove (2), a support steel plate (8) located directly above the bottom support base (1), a hollow support rod (9) located below four corners of the support steel plate (8), a longitudinal component movable cavity (10) arranged inside the hollow support rod (9), an inner movable plate (11) placed inside the longitudinal component movable cavity (10), a longitudinal telescopic rod (12) fixedly mounted on the upper end surface of the inner movable plate (11) and having its top end fixedly mounted on the bottom surface of the support steel plate (8), and a coil spring (13) placed at the bottom of the inner movable plate (11), characterized in that: Also includes, A threaded adjustment mechanism (5) is provided inside thereof with a threaded support rod (54) capable of driving a first fixing plate (4) to move, and an externally threaded sleeve (51) mounted on the outer periphery of the threaded support rod (54) via a threaded structure (55). The threaded adjustment mechanism (5) comprises an externally threaded sleeve (51), the outer periphery of the bottom of the externally threaded sleeve (51) being mounted in a concave mounting groove (2) via a bearing, an internally threaded hole (52) with openings at both ends being provided at the center of the externally threaded sleeve (51), and the externally threaded sleeve (51) being located in the internally threaded hole (52) via a threaded structure (55). 55) is installed with a threaded support rod (54), the top of the threaded support rod (54) is provided with a mounting head (56) which is an integral structure with the threaded support rod (54) and fixedly mounted on the bottom of the first fixing plate (4), the inside of the threaded support rod (54) is provided with a polygonal limiting hole (57) with a bottom opening, the inside of the polygonal limiting hole (57) is inserted with a polygonal limiting rod (58), and the bottom end of the polygonal limiting rod (58) is fixedly mounted inside the rod body fixing groove (3), and the outer circumferential surface of the externally threaded sleeve (51) is provided with a plurality of external limiting protrusions (53) which are an integral structure with the threaded support rod (54); and a pneumatic limiting mechanism (6), wherein a special-shaped sleeve (61) located on the periphery of an externally threaded sleeve (51) and a sheet-like rubber bag (67) located inside the special-shaped sleeve (61) are arranged inside the pneumatic limiting mechanism (6), wherein the special-shaped sleeve (61) is provided with an inner sleeve hole structure (62) at the center of the special-shaped sleeve (61) that can be sleeved on the periphery of an external limiting protrusion (53), wherein the inner circumferential surface of the special-shaped sleeve (61) is provided with a plurality of internal limiting protrusions (63) having an integral structure therewith, wherein each of the internal limiting protrusions (63) is provided with a closed gas reserved cavity (64), and the plurality of gas reserved cavities (64) are connected by an annular The inner limit protrusion (63) is connected to the cavity (65), and a strip-shaped embedding opening (66) connecting the gas reserved cavity (64) and the inner sleeve hole structure (62) is provided on one side of each of the inner limit protrusions (63). A sheet-shaped rubber bag (67) is embedded in a closed manner inside each of the strip-shaped embedding openings (66). The sheet-shaped rubber bag (67) is made of a rubber material with an elastic reset function. The outer circumferential surface of the special-shaped sleeve (61) is provided with a plurality of internal rack structures (68) integrally formed therewith. The upper end surface of the special-shaped sleeve (61) is provided with an inflation channel (69) integrally formed therewith and connected to the annular cavity (65), and an air valve is installed inside the inflation channel (69).

2. A steel structure support according to claim 1, characterized in that: The thread structure (55) comprises an internal thread structure arranged on the inner circumferential wall of the external thread sleeve (51) and an external thread structure arranged on the outer circumferential surface of the thread support rod (54), and the internal thread structure matches the external thread structure.

3. A steel structure support according to claim 1, characterized in that: The structural shape of the longitudinal cross section of the polygonal limiting hole (57) is consistent with the structural shape of the longitudinal cross section of the polygonal limiting rod (58), both of which are polygonal structures, and the structural dimensions of the longitudinal cross section of the polygonal limiting hole (57) match the structural dimensions of the longitudinal cross section of the polygonal limiting rod (58).

4. The steel structure support according to claim 1, characterized in that: The number of the inner limit protrusions (63) is consistent with the number of the outer limit protrusions (53).

5. The steel structure support according to claim 1, characterized in that: When the inner limit protrusion (63) is inserted into the gap between the two outer limit protrusions (53), a mechanical gap is still retained between the adjacent inner limit protrusions (63) and outer limit protrusions (53).

6. The steel structure support according to claim 1, characterized in that: It also includes a fixed limiting mechanism (7), inside of which is provided an arc-shaped limiting plate (73) located in a fixed state on the periphery of the inner rack structure (68), and an outer rack structure (74) arranged on the inner concave surface of the arc-shaped limiting plate (73) and capable of meshing with the inner rack structure (68).

7. A steel structure support according to claim 6, characterized in that: The fixed limiting mechanism (7) comprises an annular fixing plate (71) fixedly mounted on the upper surface of the bottom support base (1); a sleeve release hole (72) is provided at the center of the annular fixing plate (71); an arc-shaped limiting plate (73) integrally formed with the annular fixing plate (71) is provided on the upper end surface of the annular fixing plate (71); and a plurality of outer rack structures (74) integrally formed with the annular fixing plate (71) are provided on the inner concave surface of the arc-shaped limiting plate (73).

8. The steel structure support according to claim 7, characterized in that: The outer rack structure (74) is capable of meshing with the inner rack structure (68).

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