Folding formwork support for cast-in-place floor slab

Abstract

The utility model belongs to the technical field of constructional engineering construction, and relates to a folding formwork support for a cast-in-place floor, a telescopic stand column is vertically arranged on the upper surface of a pedestal, a cross beam is arranged at the top of the telescopic end of the telescopic stand column, the cross beam is horizontally erected, and the cross beam and the telescopic end of the telescopic stand column form a T-shaped supporting structure. The end, away from the telescopic stand column, of the beam is connected with one end of a folding arm through a rotating shaft, the folding arm can rotate in the vertical plane around the end of the beam, the other end of the folding arm is connected with the telescopic end of a telescopic supporting rod through a rotating shaft, and the fixed end of the telescopic supporting rod is connected to the side wall of the fixed end of the telescopic stand column through a rotating shaft. Rotating shafts at two ends of the folding arm are parallel to rotating shafts at fixed ends of the telescopic supporting rods; the formwork support can be used as a formwork support during construction of a cast-in-place floor slab structure and can also be used as a construction operation platform, the support is convenient and fast to mount and dismount, and the construction period is shortened; the support structure is not prone to damage, and structural safety is high.

Description

Technical Field

[0001] The utility model belongs to the technical field of construction engineering construction, and relates to a folding formwork support for cast-in-place floor slabs. Background Technique

[0002] In the construction of building structures, full hall scaffolds are usually used to support the formwork structure for cast-in-place concrete floor slabs. There are the following disadvantages in setting up full hall scaffolds: the erection and demolition of full hall scaffolds are relatively cumbersome and require a series of complex procedures and steps to be completed, resulting in a long construction period; during the use of scaffold components, due to damage, rust, etc. of the components, the safety of the components is reduced, and there are potential safety hazards of collapse for full hall scaffolds; it is difficult to level the top of full hall scaffolds, resulting in poor flatness and low precision after the floor slab is poured.

[0003] Therefore, a formwork support that is convenient and fast for installation and disassembly, has a simple and reliable support structure, and has high flatness and precision is needed to solve the above technical problems. Content of the Utility Model

[0004] The technical solution adopted by the utility model to solve the technical problems is: a folding formwork support for cast-in-place floor slabs, including: a pedestal, telescopic columns, cross beams, folding arms, and telescopic struts. The telescopic columns are vertically arranged on the upper surface of the pedestal, and the top of the telescopic end of the telescopic column is provided with a cross beam. The cross beam is horizontally erected, and the cross beam and the telescopic end of the telescopic column form a T-shaped support structure. One end of a folding arm is rotatably connected to the end of the cross beam away from the telescopic column. The folding arm can rotate around the rotating shaft at the end of the cross beam in a vertical plane. The other end of the folding arm is rotatably connected to the telescopic end of the telescopic strut, and the fixed end of the telescopic strut is rotatably connected to the side wall of the fixed end of the telescopic column; the rotating shafts at both ends of the folding arm are parallel to the rotating shaft at the fixed end of the telescopic strut;

[0005] The folding formwork support includes: an erection mode and a folding mode; in the erection mode, the telescopic end of the telescopic column extends, the telescopic end of the telescopic strut extends, the folding arm rotates around the cross beam to a horizontal position, the telescopic end of the telescopic strut obliquely supports the end of the folding arm away from the cross beam from bottom to top, the telescopic end of the telescopic column vertically supports the end of the folding arm rotatably connected to the cross beam through the cross beam from bottom to top, and the folding arm, the cross beam, the telescopic strut, and the telescopic column form a triangular support structure; in the folding mode, the telescopic end of the telescopic column retracts, the telescopic end of the telescopic strut retracts, the folding arm rotates around the cross beam and then folds on the side of the telescopic column, and the telescopic strut rotates around the telescopic column and then folds on the side of the telescopic column.

[0006] Preferably, there are two sets of folding arms and telescopic struts on the telescopic column respectively, and the two sets of folding arms and telescopic struts are symmetrically arranged on both sides of the telescopic column respectively.

[0007] Preferably, the telescopic column is a three-section telescopic rod. The telescopic column is successively the first rod, the second rod, and the third rod from top to bottom. The first rod, the second rod, and the third rod are coaxially sleeved and telescopic. When the first rod telescopes, the second rod is the fixed part of the first rod. When the second rod telescopes, the third rod is the fixed part of the second rod;

[0008] The fixed end of the telescopic strut is rotationally connected to the side wall at the top of the second rod.

[0009] Preferably, a first rotating ear protruding downward is fixed at one end of the folding arm away from the cross beam. The telescopic end of the telescopic strut is rotationally connected to the first rotating ear. The distance from the rotational connection of the first rotating ear to the lower side of the folding arm is greater than the diameter of the telescopic strut;

[0010] A second rotating ear protruding horizontally outward is fixed to the side wall of the fixed end of the telescopic column. The fixed end of the telescopic strut is rotationally connected to the second rotating ear. The distance from the rotational connection of the second rotating ear to the side wall of the telescopic strut is greater than the diameter of the telescopic strut; the distance that the cross beam extends out of the side wall of the telescopic column is greater than the diameter of the telescopic strut; in the folding mode, the folding arm and the telescopic strut are vertically retracted on the side of the telescopic column.

[0011] Preferably, the telescopic column and the telescopic strut respectively include: a hydraulic telescopic rod, an electric telescopic rod.

[0012] More preferably, when the telescopic column and the telescopic strut are hydraulic telescopic rods, the telescopic column and the telescopic strut are connected to a hydraulic pump; when the telescopic column and the telescopic strut are electric telescopic rods, the telescopic column and the telescopic strut are connected to a power source.

[0013] Preferably, the bottom of the pedestal is provided with rollers and adjusting foot cups. The adjusting foot cups are threadedly connected to the bottom of the pedestal in the vertical direction;

[0014] When the adjusting foot cup is screwed upward into the pedestal, the bottom of the roller contacts the ground;

[0015] When the adjusting foot cup is screwed downward out of the pedestal, the bottom of the roller is disengaged from the ground.

[0016] Preferably, a plurality of telescopic columns are horizontally and evenly distributed on the upper surface of the pedestal. The folding arms at the tops of the plurality of telescopic columns are parallel to each other, and adjacent folding arms are obliquely pulled and fixed by an inclined pull rod.

[0017] More preferably, the inclined pull rod and the folding arm are detachably connected.

[0018] Preferably, a horizontal bottom plate is welded to the bottom of the telescopic column. The bottom plate is detachably connected to the upper surface of the pedestal by bolts. Support rib plates are evenly distributed and welded around the side wall of the bottom of the telescopic column and the upper surface of the bottom plate.

[0019] The beneficial effects of the present utility model are:

[0020] The support of the utility model can be used as a formwork support during the construction of the cast-in-place floor slab structure, and at the same time can also be used as a construction operation platform. The support is convenient and fast to install and disassemble, shortening the construction period; the support structure is not easily damaged and has high structural safety; the support is leveled through a dual structure of adjusting foot cups and hydraulic rods, improving the flatness and accuracy of the floor slab structure construction. Description of the Drawings

[0021] Figure 1 is the schematic rear elevation view after erection of a folding formwork support for a cast-in-place floor slab of the utility model;

[0022] Figure 2 is Figure 1 the partial enlarged view in the direction A of

[0023] Figure 3 is the schematic elevation view after folding of the utility model;

[0024] Figure 4 is the schematic plan view after erection of the utility model.

[0025] Among them, 1, pedestal; 2, telescopic column; 3, cross beam; 4, folding arm; 5, telescopic strut; 6, first rod; 7, second rod; 8, third rod; 9, first rotating ear; 10, second rotating ear; 11, roller; 12, adjusting foot cup; 13, diagonal tie rod; 14, bottom plate; 15, bolt; 16, support rib plate. Detailed Embodiment

[0026] Next, the relevant technologies in the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

[0027] Refer to Figures 1 to 4 , the folding formwork support for a cast-in-place floor slab in this embodiment includes: a pedestal 1, a telescopic column 2, a cross beam 3, a folding arm 4, and a telescopic strut 5. The telescopic column 2 is vertically arranged on the upper surface of the pedestal 1. The top of the telescopic end of the telescopic column 2 is provided with a cross beam 3. The cross beam 3 is horizontally erected. The cross beam 3 and the telescopic end of the telescopic column 2 form a T-shaped support structure. One end of the folding arm 4 is rotatably connected to the end of the cross beam 3 away from the telescopic column 2. The folding arm 4 can rotate in a vertical plane around the rotating shaft at the end of the cross beam 3. The other end of the folding arm 4 is rotatably connected to the telescopic end of the telescopic strut 5. The fixed end of the telescopic strut 5 is rotatably connected to the side wall of the fixed end of the telescopic column 2; the rotating shafts at both ends of the folding arm 4 are parallel to the rotating shaft of the fixed end of the telescopic strut 5;

[0028] The foldable formwork support includes: an erection mode and a folding mode; in the erection mode, the telescopic end of the telescopic column 2 is extended, the telescopic end of the telescopic support rod 5 is extended, the folding arm 4 is rotated around the cross beam 3 to a horizontal position, the telescopic end of the telescopic support rod 5 obliquely supports the end of the folding arm 4 away from the cross beam 3 from bottom to top, the telescopic end of the telescopic column 2 vertically supports the folding arm 4 through the cross beam 3 from bottom to top and connects to one end of the cross beam 3 through the rotating shaft, and the folding arm 4, the cross beam 3, the telescopic support rod 5, and the telescopic column 2 form a triangular support structure; in the folding mode, the telescopic end of the telescopic column 2 is retracted, and the telescopic support rod 5 is extended. The telescopic end of the contraction support rod 5 is retracted, the folding arm 4 rotates around the cross beam 3 and is folded to the side of the telescopic column 2, and the telescopic support rod 5 rotates around the telescopic column 2 and is folded to the side of the telescopic column 2; in the erection mode, the foldable formwork support can be quickly opened into a supporting state to facilitate support under the cast-in-place concrete floor; in the folding mode, the foldable formwork support can be quickly folded and folded together, and both the height and width dimensions are reduced compared to the dimensions of the erection mode, which is beneficial for construction workers to carry it when changing sites and save warehouse space when storing.

[0029] Furthermore, the telescopic column 2 is provided with two sets of folding arms 4 and telescopic struts 5, respectively, and the two sets of folding arms 4 and telescopic struts 5 are symmetrically arranged on both sides of the telescopic column 2; the symmetrically arranged folding arms 4 and telescopic struts 5 are conducive to evenly distributing the gravity on both sides of the top of the telescopic column 2 during support, making the supporting structure more stable, while the folding arms 4 and telescopic struts 5 arranged on one side are suitable for supporting scenarios of unilaterally suspended cast-in-place concrete floors.

[0030] Furthermore, the telescopic column 2 is a three-section telescopic rod, and the telescopic column 2 is respectively composed of a first rod 6, a second rod 7, and a third rod 8 from top to bottom. The first rod 6, the second rod 7, and the third rod 8 are coaxially sleeved and telescopic. When the first rod 6 is telescoped, the second rod 7 is the fixed part of the first rod, and when the second rod is telescoped, the third rod 8 is the fixed part of the second rod; the fixed end shaft of the telescopic support rod 5 is connected to the side wall of the top end of the second rod 7; the first rod 6 is used to telescopically open or fold the folding arm 4, and the second rod 7 is used to adjust the support height of the telescopic column 2; the three-section telescopic rod is conducive to adjusting the support height of the foldable formwork support according to different on-site needs to meet the needs of different support heights in different construction sites or the same construction site, thereby making the foldable formwork support have better applicability.

[0031] Furthermore, a first rotating ear 9 protruding downward is fixed to one end of the folding arm 4 away from the crossbeam 3, and the telescopic end rotating shaft of the telescopic support rod 5 is connected to the first rotating ear 9, and the distance between the rotating shaft connection of the first rotating ear 9 and the lower side of the folding arm 4 is greater than the diameter of the telescopic support rod 5;

[0032] On the side wall of the fixed end of the telescopic column 2, a second rotating ear 10 protruding horizontally outward is fixed. The fixed end of the telescopic strut 5 is rotationally connected to the second rotating ear 10. The distance from the rotational connection of the second rotating ear 10 to the side wall of the telescopic strut 5 is greater than the diameter of the telescopic strut 5. The distance that the cross beam 3 extends out of the side wall of the telescopic column 2 is greater than the diameter of the telescopic strut 5.

[0033] In the folding mode, the folding arm 4 and the telescopic strut 5 are vertically retracted on the side of the telescopic column 2. The downward protruding first rotating ear 9 and the outward protruding second rotating ear 10 enable the folding arm 4 and the telescopic strut 5 not to interfere with each other at the rotating shaft end during contraction and folding, that is, enable the folding arm 4 and the telescopic strut 5 to contract and fold to 0 degrees, making the folding arm 4 and the telescopic strut 5 in a parallel state. Furthermore, the folding arm 4 and the telescopic strut 5 can be moved downward and close to the side of the telescopic column 2 and be parallel to the telescopic column 2. Therefore, when the folding formwork support is in the folding mode, the width dimension is more compact, saving more storage space, and can prevent the folding arm 4 and the telescopic strut 5 from being unable to be folded and rotated to 0 degrees and being easily damaged during storage and transportation.

[0034] Furthermore, the telescopic column 2 and the telescopic strut 5 respectively include: a hydraulic telescopic rod and an electric telescopic rod. Both the hydraulic telescopic rod and the electric telescopic rod can realize the telescoping of the telescopic column 2 and the telescopic strut 5. However, the hydraulic telescopic rod has a complex structure and its reliability is weaker than that of the electric telescopic rod. But the load-bearing capacity and the position locking ability after reaching the position of the hydraulic telescopic rod are stronger than those of the electric telescopic rod. Therefore, a suitable telescopic rod can be selected according to the requirements and the on-site environment.

[0035] Even further, when the telescopic column 2 and the telescopic strut 5 are hydraulic telescopic rods, the telescopic column 2 and the telescopic strut 5 are connected with a hydraulic pump; when the telescopic column 2 and the telescopic strut 5 are electric telescopic rods, the telescopic column 2 and the telescopic strut 5 are connected with a power supply.

[0036] Furthermore, the bottom of the pedestal 1 is provided with rollers 11 and adjusting foot cups 12. The adjusting foot cups 12 are threadedly connected to the bottom of the pedestal 1 in the vertical direction. The rollers 11 and the adjusting foot cups 12 are used to push the folding formwork support to walk horizontally and fix the folding formwork support for standing support.

[0037] When the adjusting foot cup 12 is screwed upward into the pedestal 1, the bottom of the roller 11 touches the ground, which is convenient for construction workers to move or finely adjust the horizontal position of the folding formwork support.

[0038] When the adjusting foot cup 12 is screwed downward out of the pedestal 1, the bottom of the roller 11 is separated from the ground; enabling the folding formwork support to stand on the ground and ensuring the reliability of the support of the folding formwork support.

[0039] Further, a plurality of telescopic columns 2 are horizontally and evenly distributed on the upper surface of the pedestal 1. The folding arms 4 at the tops of the plurality of telescopic columns 2 are parallel to each other, and adjacent folding arms 4 are obliquely pulled and fixed by an inclined pull rod 13.

[0040] Furthermore, the inclined pull rod 13 and the folding arm 4 are detachably connected.

[0041] Further, a horizontal bottom plate 14 is welded to the bottom of the telescopic column 2. The bottom plate 14 is detachably connected to the upper surface of the pedestal 1 by bolts 15. Support ribs 16 are circumferentially and evenly welded to the upper surface of the bottom side wall of the telescopic column 2 and the bottom plate 14. The bottom plate 14 and the support ribs 16 enable the gravity borne by the telescopic column 2 to be more evenly distributed to the pedestal 1 and finally transmitted to the ground. Therefore, the support of the folding formwork support can be made safer and more reliable.

[0042] Embodiment

[0043] The cast-in-place floor folding formwork support of this embodiment has a rectangular structure for the pedestal 1 at the bottom of the support, which bears all the loads of the support and transmits all the loads to the floor. Four rollers 11 for walking are provided at the four corners of the bottom of the pedestal 1. The support can be transported by the rollers 11 without hoisting equipment, and the installation and disassembly are simple and easy. Four corbels are provided at the side of the long side direction of the pedestal 1 near the corner position, and adjusting foot cups 12 are provided at the bottom of the corbels. The adjusting foot cups 12 are threadedly connected to the corbels. When the support is erected, the adjusting foot cups 12 are adjusted so that the adjusting foot cups 12 are supported on the ground, and the height of the adjusting foot cups 12 extending out of the corbels can be adjusted by adjusting the tightness of the adjusting foot cups 12.

[0044] The telescopic columns 2 and the telescopic struts 5 are the main control devices for the erection and folding of the support. The telescopic columns 2 and the telescopic struts 5 adopt hydraulic rods, and a hydraulic device is used to synchronously control the lifting of all columns. The telescopic columns 2 are vertically arranged at equal intervals along the center line parallel to the long side direction of the pedestal 1 on the top surface of the pedestal 1. A cross beam 3 is fixedly arranged at the top end of the telescopic column 2. Folding arms 4 are symmetrically hinged on both sides of the cross beam 3, and telescopic struts 5 are hinged between the folding arms 4 and the telescopic columns 2. The folding arms 4 and the telescopic struts 5 on the same telescopic column 2 are installed in the same vertical plane. After the support is unfolded, a stable triangular support is formed to bear the load on the upper part of the support. The unfolding and folding of the support are controlled by the hydraulic control devices of the telescopic columns 2 and the telescopic struts 5. Oblique pull rods 13 arranged in a cross shape are hinged between the folding arms 4, and the oblique pull rods 13 connect the folding arms 4 into a whole to improve the stability of the support in the horizontal plane.

[0045] The cast-in-place floor folding formwork support of this embodiment can be used as a formwork support during the construction of the cast-in-place floor structure and can also be used as a construction operation platform. When used as a formwork support for floor construction, several supports are selected according to the floor size, the supports are erected and the telescopic columns 2, telescopic struts 5 and adjustable foot cups 12 are adjusted to make the top surface of the support horizontal and meet the elevation requirements. After connecting and fixing the supports into an integral body, the main formwork ribs, secondary ribs and bottom formwork are successively erected on the top surface of the support, and then the steel bars can be tied on it to complete the floor pouring. When used as a construction operation platform, after the support is erected, a platform board is erected on the top surface of the support, guardrails are installed around, and the height of the hydraulic column is adjusted according to the construction operation requirements, and then the construction operation can be carried out on it.

[0046] In summary, the utility model can be used as a formwork support during the construction of the cast-in-place floor structure and can also be used as a construction operation platform. The installation and disassembly of the support are convenient and fast, shortening the construction period; the structure of the support is not easily damaged and has high structural safety; the support is leveled by the dual structures of the adjustable foot cup and the hydraulic rod, improving the flatness and precision of the cast-in-place floor structure construction. Therefore, the utility model has a wide application prospect.

[0047] It should be emphasized that the above are only the preferred embodiments of the utility model and do not impose any form of limitation on the utility model. Any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the utility model still fall within the scope of the technical solution of the utility model.

Claims

1. A foldable formwork support for cast-in-place floor slabs, characterized in that Comprising: A pedestal (1), a telescopic column (2), a cross beam (3), a folding arm (4), and a telescopic strut (5). The telescopic column (2) is vertically arranged on the upper surface of the pedestal (1). The top of the telescopic end of the telescopic column (2) is provided with the cross beam (3). The cross beam (3) is horizontally installed. The cross beam (3) and the telescopic end of the telescopic column (2) form a T-shaped support structure. One end of the folding arm (4) is rotatably connected to the end of the cross beam (3) away from the telescopic column (2). The folding arm (4) can rotate around the end shaft of the cross beam (3) in a vertical plane. The other end of the folding arm (4) is rotatably connected to the telescopic end of the telescopic strut (5). The fixed end of the telescopic strut (5) is rotatably connected to the side wall of the fixed end of the telescopic column (2). The shafts at both ends of the folding arm (4) are parallel to the shaft of the fixed end of the telescopic strut (5). The folding formwork support includes: an erection mode and a folding mode. In the erection mode, the telescopic end of the telescopic column (2) extends, the telescopic end of the telescopic strut (5) extends, the folding arm (4) rotates around the cross beam (3) to a horizontal position. The telescopic end of the telescopic strut (5) obliquely supports the end of the folding arm (4) away from the cross beam (3) from bottom to top. The telescopic end of the telescopic column (2) vertically supports the end of the folding arm (4) rotatably connected to the cross beam (3) through the cross beam (3) from bottom to top. The folding arm (4), the cross beam (3), the telescopic strut (5), and the telescopic column (2) form a triangular support structure. In the folding mode, the telescopic end of the telescopic column (2) retracts, the telescopic end of the telescopic strut (5) retracts. The folding arm (4) rotates around the cross beam (3) and then folds in the side of the telescopic column (2). The telescopic strut (5) rotates around the telescopic column (2) and then folds in the side of the telescopic column (2).

2. The foldable formwork support for a cast-in-place floor slab according to claim 1, characterized in that, There are two sets of the folding arm (4) and the telescopic strut (5) on the telescopic column (2) respectively. The two sets of the folding arm (4) and the telescopic strut (5) are symmetrically arranged on both sides of the telescopic column (2).

3. The foldable formwork support for a cast-in-place floor slab according to claim 1, wherein, The telescopic column (2) is a three-section telescopic rod. The telescopic column (2) is respectively the first rod (6), the second rod (7), and the third rod (8) from top to bottom. The first rod (6), the second rod (7), and the third rod (8) are coaxially sleeved and telescopic. When the first rod (6) telescopes, the second rod (7) is the fixed part of the first rod. When the second rod telescopes, the third rod (8) is the fixed part of the second rod. The fixed end of the telescopic strut (5) is rotatably connected to the side wall of the top of the second rod (7).

4. The foldable formwork support for a cast-in-place floor slab according to claim 1, characterized in that, A first rotating ear (9) protruding downward is fixed at the end of the folding arm (4) away from the cross beam (3). The telescopic end of the telescopic strut (5) is rotatably connected to the first rotating ear (9). The distance from the shaft connection of the first rotating ear (9) to the lower side of the folding arm (4) is greater than the diameter of the telescopic strut (5). A second rotating ear (10) protruding horizontally outward is fixed to the side wall of the fixed end of the telescopic column (2). The fixed end of the telescopic support rod (5) is rotationally connected to the second rotating ear (10). The distance from the rotational connection of the second rotating ear (10) to the side wall of the telescopic support rod (5) is greater than the diameter of the telescopic support rod (5). The distance that the cross beam (3) extends out of the side wall of the telescopic column (2) is greater than the diameter of the telescopic support rod (5). In the folding mode, the folding arm (4) and the telescopic support rod (5) are vertically retracted to the side of the telescopic column (2).

5. A foldable formwork support for a cast-in-place floor slab according to claim 1, characterized in that, The telescopic column (2) and the telescopic support rod (5) respectively include: a hydraulic telescopic rod and an electric telescopic rod.

6. The foldable formwork support for a cast-in-place floor slab according to claim 5, characterized in that, When the telescopic column (2) and the telescopic support rod (5) are hydraulic telescopic rods, the telescopic column (2) and the telescopic support rod (5) are connected to a hydraulic pump; when the telescopic column (2) and the telescopic support rod (5) are electric telescopic rods, the telescopic column (2) and the telescopic support rod (5) are connected to a power source.

7. The foldable formwork support for a cast-in-place floor slab according to claim 1, characterized in that, Rollers (11) and adjusting foot cups (12) are provided at the bottom of the pedestal (1). The adjusting foot cups (12) are threadedly connected to the bottom of the pedestal (1) in the vertical direction. When the adjusting foot cup (12) is screwed upward into the pedestal (1), the bottom of the roller (11) contacts the ground. When the adjusting foot cup (12) is screwed downward out of the pedestal (1), the bottom of the roller (11) is separated from the ground.

8. A foldable formwork support for a cast-in-place floor slab according to claim 1, characterized in that, A plurality of telescopic columns (2) are horizontally and evenly distributed on the upper surface of the pedestal (1). The folding arms (4) at the tops of the plurality of telescopic columns (2) are parallel to each other, and adjacent two of the folding arms (4) are obliquely pulled and fixed by an inclined stay bar (13).

9. The foldable formwork support for a cast-in-place floor slab according to claim 8, characterized in that, The inclined stay bar (13) and the folding arm (4) are detachably connected.

10. The foldable formwork support for the cast-in-place floor slab according to claim 1, characterized in that, A horizontal bottom plate (14) is welded to the bottom of the telescopic column (2). The bottom plate (14) is detachably connected to the upper surface of the pedestal (1) by bolts (15). Support rib plates (16) are circumferentially and evenly welded to the upper surface of the side wall at the bottom of the telescopic column (2) and the bottom plate (14).

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