Construction engineering hoisting equipment and using method

Abstract

The invention discloses constructional engineering hoisting equipment and a using method, and relates to the field of hoisting equipment, the constructional engineering hoisting equipment comprises a hoisting plate, steel twisted ropes are symmetrically and fixedly connected to the four corners of the hoisting plate, the ends, away from the hoisting plate, of all the steel twisted ropes are installed on a crane hook, and the two ends of the interior of the hoisting plate are slidably connected with an upper straight plate and a lower straight plate correspondingly; a gear is rotationally connected to the inner side face of the hanging plate, tooth grooves are formed in the opposite sides of the upper straight plate and the lower straight plate, and the two tooth grooves are engaged with the upper end and the lower end of the gear correspondingly. According to the building engineering hoisting equipment and the using method, through mutual cooperation of an upper straight plate, a lower straight plate, a gear, a connecting plate, a clamping rod and a limiting unit, the clamping rod and a prefabricated floor slab can be stably connected conveniently when the prefabricated floor slab is prepared to be hoisted, so that in the hoisting process, the clamping rod and the prefabricated floor slab do not move relatively, and the hoisting efficiency is improved. And the stability and the safety in the prefabricated floor slab hoisting process are better.

Description

Technical Field

[0001] The present invention relates to the technology of hoisting equipment, and particularly relates to a hoisting equipment for construction engineering and a using method thereof. Background Art

[0002] During the construction process of buildings, hoisting equipment is essential, which is mainly used for hoisting sediment, precast floor slabs and other heavy building materials.

[0003] For commonly used hoisting equipment in building construction, it mainly cooperates the winch with the sling, inserts the clamping rod connected to the end of the sling into the holes on both sides of the precast floor slab, and then winds up the sling to lift the precast floor slab.

[0004] In the Chinese invention patent with the publication number of CN118324007B, a building material hoisting equipment is disclosed, including a hoisting equipment; the hoisting equipment includes a hanging bracket; pull plates are arranged on both sides of the four cross beams; a hanging plate is fixedly connected to the bottom of the pull plates together; the hoisting assembly includes two mounting plates; two rotating shafts are rotatably connected between the two mounting plates; first gears are fixedly connected to the two rotating shafts; side plates are fixedly connected to both end faces of the two first gears close to the two mounting plates; a hanging rod is fixedly connected to the back sides of the two side plates on the two first gears; a T-shaped rod is slidably connected in the chute; a cross bar is fixedly connected to the two opposite T-shaped rods on the two hoisting assemblies; two hooks are installed on the cross bar.

[0005] In the actual application process of the existing equipment, since the clamping rod is only placed in the circular groove, during the process of tightening the steel wire rope, it will drive the clamping rod to move in the circular groove, thus easily causing the clamping rod to move out of the circular groove, resulting in a reduction in the contact area between the hook and the circular groove, thereby increasing the risk of dropping when lifting the precast floor slab. In the actual application process of the above patent, the angles of the hanging rod and the T-shaped rod provided thereon are not fixed, making the contact state between the hook and the side hole of the precast slab not fixed. Therefore, during the hoisting process, it is also easy to occur that the contact area between the hook and the precast slab is small, resulting in the situation that the precast floor slab cannot be stably supported. In addition, the second spring is in an over-stretched state for a long time during the hoisting process, thus easily generating fatigue and resulting in poor resilience during its subsequent use. Therefore, during the process of the hook being lifted along with the lifting rope, the hook will also move relative to the precast floor slab, resulting in the hook being easily moved out of the circular groove and increasing the risk of dropping when lifting the precast floor slab. Summary of the Invention

[0006] The purpose of the present invention is to provide a hoisting equipment for construction engineering and a using method thereof to solve the above deficiencies in the prior art.

[0007] To achieve the above object, the present invention provides the following technical solution: a hoisting device for construction engineering, including a hanging plate, steel wire ropes are symmetrically and fixedly connected to the four corners of the hanging plate, and one ends of all the steel wire ropes away from the hanging plate are installed on the crane hook. Two ends inside the hanging plate are respectively slidably connected with an upper straight plate and a lower straight plate. A gear is rotatably connected to the inner side surface of the hanging plate. Tooth grooves are arranged on the opposite sides of the upper straight plate and the lower straight plate, and the two groups of tooth grooves are respectively meshed with the upper and lower ends of the gear; Connecting plates are installed at the mutually remote ends of the upper straight plate and the lower straight plate. Columns are fixedly installed on the opposite sides of the two connecting plates. A precast floor slab is connected between the two columns; A limiting unit is installed on the lower straight plate, and the limiting unit is used to limit the relative movement between the upper straight plate and the lower straight plate.

[0008] Further, vertical grooves are formed in the two sides of the hanging plate and are distributed up and down. The upper straight plate and the lower straight plate are respectively slidably connected in the two vertical grooves.

[0009] Further, the limiting unit includes a long groove formed inside the lower straight plate. A strip plate is slidably connected to the inner side surface of the long groove. A return spring is fixedly connected between the strip plate and the inner wall of the long groove. Vertical grooves symmetrically distributed on both sides of the long groove are formed inside the lower straight plate. A clamping rod is slidably connected to the inner side surface of the vertical groove. A linkage rod is rotatably connected between the clamping rod and the strip plate. When the strip plate moves deeper into the long groove, the linkage rod drives the clamping rod to move towards the side close to the strip plate. A plurality of clamping grooves adapted to the clamping rod are formed in the inner wall of the vertical groove.

[0010] Further, a vertical groove is formed in the top of the connecting plate. A pressing block is slidably connected to the inner side surface of the vertical groove. A driving rod is fixedly connected to the bottom of the pressing block. An auxiliary inclined surface is arranged at one end of the strip plate close to the driving rod. When the driving rod moves downward to squeeze the auxiliary inclined surface, the driving rod pushes the strip plate to move deeper into the long groove.

[0011] Further, through grooves are symmetrically formed in the two sides of the top of the connecting plate. An adjusting plate is slidably connected to the inner side surface of the through groove. A plurality of positioning grooves are equidistantly formed from top to bottom on both sides of the adjusting plate. Accommodating grooves corresponding to the positioning grooves are formed in the two sides inside the connecting plate. A supporting clamping block is slidably connected to the inner side surface of each accommodating groove. A supporting spring is fixedly connected between the supporting clamping block and the inner wall of the accommodating groove. A wire groove is formed between the accommodating groove and the vertical groove. A traction wire is fixedly connected between the supporting clamping block and the side surface of the driving rod. When the driving rod moves downward to traction one end of the traction wire, the other end of the traction wire traction the supporting clamping block to withdraw from the positioning groove.

[0012] Further, the towing line passes through the inside of the wire groove, and the width dimension value of the driving rod is smaller than the width dimension value of the pressing block.

[0013] Further, a connecting seat is fixedly connected to the bottom of the connecting plate, and the clamping column is fixedly connected to the connecting seat.

[0014] A usage method of a construction engineering hoisting device, which is applied to the above-mentioned construction engineering hoisting device, includes the following steps: S1. Drive the hanging plate to move to a position corresponding to the precast floor slab through the crane hook; S2. Operators on both sides hold the connecting plate and the connecting seat by hand at the same time, and an operator on one side presses the pressing block, so that the clamping rod exits from the clamping groove, and at the same time the supporting clamping block exits from the positioning groove; S3. The operator freely pulls the connecting seat in the horizontal direction, so that the distance between the two clamping columns is convenient for installation. At the same time, the operator can also freely adjust the connecting seat in the vertical direction, and quickly insert the clamping columns into the holes on both sides of the precast floor slab; S4. Release the pressing block, so that the clamping rod is embedded in the clamping groove again, and the supporting clamping block is inserted into the positioning groove again; S5. Drive the hanging plate to move through the crane hook until the precast floor slab is hoisted to a suitable position, and then repeat step S2, so that the connecting seat can move freely and the clamping columns are taken out of the precast floor slab.

[0015] Compared with the prior art, the construction engineering hoisting device and the usage method provided by the present invention have the following beneficial effects: 1. For the construction engineering hoisting device and the usage method, through the mutual cooperation among the upper straight plate, the lower straight plate, the gear, the connecting plate, the clamping rod and the limiting unit, the clamping rod can be stably connected with the precast floor slab conveniently during the hoisting preparation of the precast floor slab. Therefore, during the hoisting process, there is no relative movement between the clamping rod and the precast floor slab, making the stability and safety during the precast floor slab hoisting process better.

[0016] 2. For the construction engineering hoisting device and the usage method, through the mutual cooperation among the upper straight plate, the lower straight plate, the gear and the adjusting plate, the clamping columns can be freely adjusted in multiple dimensions in the vertical direction and the horizontal direction during the hoisting preparation process, so that the clamping columns can be quickly inserted into the precast floor slab, significantly improving the hoisting efficiency of the precast floor slab. And, with the mutual cooperation between the supporting clamping block and the positioning groove, the movement of the adjusting plate can be restricted during the subsequent hoisting process, without affecting the hoisting stability of the precast floor slab.

[0017] 3. The hoisting equipment and its usage method for this construction project can, through the mutual cooperation between the pressing block and the driving rod, adjust and control the movement of the lower straight plate and the movement of the connecting plate simultaneously during the adjustment process, enabling the connection between the clamping column and the precast floor slab to be more efficient during the hoisting preparation process. This can not only greatly shorten the hoisting preparation time of the precast floor slab but also make the hoisting equipment more convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings.

[0019] Figure 1 Schematic structural diagram of the whole (including the precast floor slab) provided by the embodiment of the present invention; Figure 2 Schematic structural diagram of the whole (excluding the precast floor slab) provided by the embodiment of the present invention; Figure 3 Schematic longitudinal sectional structural diagram of the hanging plate provided by the embodiment of the present invention; Figure 4 Schematic transverse sectional structural diagram of the hanging plate and the lower straight plate provided by the embodiment of the present invention; Figure 5 Provided by the embodiment of the present invention Figure 4 Enlarged structural diagram at position A; Figure 6 Schematic internal structural diagram of the connecting plate and the lower straight plate provided by the embodiment of the present invention; Figure 7 Schematic internal structural diagram of the connecting plate provided by the embodiment of the present invention; Figure 8 Provided by the embodiment of the present invention Figure 7 Enlarged structural diagram at position B; Figure 9 Schematic longitudinal sectional structural diagram of the connecting plate provided by the embodiment of the present invention; Figure 10 Provided by the embodiment of the present invention Figure 9 Structural diagram at position C;

[0020] Description of the reference numerals: 1. Suspension plate; 101. Steel wire rope; 102. Crane hook; 2. Upper straight plate; 21. Lower straight plate; 22. Gear; 23. Tooth groove; 24. Straight groove; 3. Connecting plate; 31. Clamping post; 4. Prefabricated floor slab; 5. Long groove; 51. Strip board; 52. Return spring; 53. Clamping rod; 54. Linking rod; 55. Card slot; 56. Vertical groove; 57. Pressing block; 58. Driving rod; 59. Auxiliary inclined plane; 6. Through groove; 61. Adjusting plate; 62. Positioning groove; 63. Supporting clamping block; 64. Supporting spring; 65. Wire groove; 66. Traction wire; 7. Connecting seat. Detailed implementation mode

[0021] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0022] Embodiment 1: Please refer to Figures 1-10 , a hoisting device for construction engineering, including a suspension plate 1. Steel wire ropes 101 are symmetrically and fixedly connected to the four corners of the suspension plate 1. One ends of all the steel wire ropes 101 far away from the suspension plate 1 are installed on the crane hook 102. The upper straight plate 2 and the lower straight plate 21 are respectively slidably connected to the two ends inside the suspension plate 1. The inner side surface of the suspension plate 1 is rotatably connected with a gear 22. Tooth grooves 23 are arranged on the opposite sides of the upper straight plate 2 and the lower straight plate 21. The two groups of tooth grooves 23 are respectively meshed with the upper and lower ends of the gear 22; Connecting plates 3 are installed at the mutually remote ends of the upper straight plate 2 and the lower straight plate 21. Clamping posts 31 are fixedly installed on the opposite sides of the two side connecting plates 3. A prefabricated floor slab 4 is connected between the two side clamping posts 31; A limiting unit is installed on the lower straight plate 21, and the limiting unit is used to limit the relative movement between the upper straight plate 2 and the lower straight plate 21.

[0023] It should be added that vertical straight grooves 24 are opened on both sides of the suspension plate 1. The upper straight plate 2 and the lower straight plate 21 are respectively slidably connected in the two straight grooves 24, so that the stability of the upper straight plate 2 and the lower straight plate 21 during the movement process is better.

[0024] In this embodiment, the limiting unit includes a long groove 5 opened inside the lower straight plate 21. A strip board 51 is slidably connected to the inner side surface of the long groove 5. A return spring 52 is fixedly connected between the strip board 51 and the inner wall of the long groove 5. Vertical grooves are opened inside the lower straight plate 21 and are symmetrically distributed on both sides of the long groove 5. A clamping rod 53 is slidably connected to the inner side surface of the vertical groove. A linking rod 54 is rotatably connected between the clamping rod 53 and the strip board 51. When the strip board 51 moves deeper into the long groove 5, the linking rod 54 drives the clamping rod 53 to move towards the side close to the strip board 51. A number of card slots 55 adapted to the clamping rod 53 are opened on the inner wall of the straight groove 24.

[0025] Further, a vertical groove 56 is formed at the top of the connecting plate 3. A pressing block 57 is slidably connected to the inner side surface of the vertical groove 56. A driving rod 58 is fixedly connected to the bottom of the pressing block 57. An auxiliary inclined surface 59 is arranged at one end of the strip plate 51 close to the driving rod 58. When the driving rod 58 moves downward to extrude the auxiliary inclined surface 59, the driving rod 58 pushes the strip plate 51 to move deeper into the long groove 5.

[0026] During the working process, first, the hanging plate 1 is lifted by the crane hook 102, so that the hanging plate 1 moves to a position opposite to the precast floor slab 4. Then, the operators on both sides hold the connecting plate 3 and the connecting seat 7 by hand at the same time. And an operator on one side presses the pressing block 57, so that the pressing block 57 moves into the vertical groove 56. And when the pressing block 57 moves, it drives the driving rod 58 to move, so that the driving rod 58 contacts the surface of the auxiliary inclined surface 59 and extrudes it. Under the guiding action of the auxiliary inclined surface 59, the strip plate 51 moves deeper into the long groove 5 and compresses the return spring 52. Under the transmission action of the linkage rod 54, when the strip plate 51 moves, the driving rod 53 is driven to withdraw from the inside of the card slot 55, so that the movement of the lower straight plate 21 is no longer restricted. At this time, the operator can horizontally pull the lower straight plate 21 to adjust the horizontal position of the driving rod 53, so that the distance value between the two driving rods 53 can facilitate the clamping of the precast floor slab 4. When the horizontal position of the driving rod 53 can meet the operation requirements, the height of the hanging plate 1 is adjusted again by the crane hook 102, so that the clamping column 31 can be inserted into the holes on both sides of the precast floor slab 4. After the clamping column 31 is inserted into the holes on both sides of the precast floor slab 4, the operator releases the pressing block 57. At this time, under the action of the return spring force of the return spring 52, the driving rod 53 is inserted into the card slot 55 again, and the relative movement between the lower straight plate 21 and the upper straight plate 2 is restricted, so that the connection stability between the clamping column 31 and the precast floor slab 4 is better.

[0027] Embodiment 2: Please refer to Figures 7-10 , on the basis of the above embodiment, this embodiment provides a technical solution: through grooves 6 are symmetrically formed on both sides of the top of the connecting plate 3. An adjusting plate 61 is slidably connected to the inner side surface of the through groove 6. A plurality of positioning grooves 62 are equidistantly arranged from top to bottom on both sides of the adjusting plate 61. Accommodating grooves corresponding to the positioning grooves 62 are formed on both sides inside the connecting plate 3. A supporting clamping block 63 is slidably connected to the inner side surface of each accommodating groove. A supporting spring 64 is fixedly connected between the supporting clamping block 63 and the inner wall of the accommodating groove. A wire groove 65 is formed between the accommodating groove and the vertical groove 56. A traction wire 66 is fixedly connected between the supporting clamping block 63 and the side surface of the driving rod 58. When the driving rod 58 moves downward to traction one end of the traction wire 66, the other end of the traction wire 66 traction the supporting clamping block 63 to withdraw from the inside of the positioning groove 62.

[0028] It should be noted that the towing line 66 passes through the inside of the wire groove 65. The width dimension value of the driving rod 58 is smaller than the width dimension value of the pressing block 57, and the height value of the part of the pressing block 57 located outside the vertical groove 56 is smaller than the distance value between the connection point of the towing line 66 on the driving rod 58 and the bottom surface of the pressing block 57, so that when the driving rod 58 moves downward to tow one end of the towing line 66, there will be no interference between the pressing block 57 and the towing line 66.

[0029] In this embodiment, a connecting seat 7 is fixedly connected to the bottom of the connecting plate 3, and the clamping column 31 is fixedly connected to the connecting seat 7.

[0030] During the installation of the clamping column 31 and the precast floor slab 4, when the pressing block 57 is pressed downward, the driving rod 58 moves downward and towes one end of the towing line 66, so that the other end can tow the supporting block 63 to move out of the positioning groove 62, so that the supporting block 63 no longer restricts the vertical movement of the adjusting plate 61. When the height value of the clamping column 31 cannot meet the requirement for inserting into the side holes of the precast floor slab 4, the operator can directly pull down the adjusting plate 61, so that the vertical position height of the clamping column 31 can be freely adjusted, so that there is no need to adjust the overall height of the hanging plate 1 through the crane hook 102, effectively reducing the time required for the preparation work of hoisting the precast floor slab 4 and further improving the hoisting efficiency of the precast floor slab 4.

[0031] Embodiment 3: On the basis of the above embodiment, this embodiment provides a usage method of a building engineering hoisting device, which is applied to the above-mentioned building engineering hoisting device, and includes the following steps: S1. Drive the hanging plate 1 to move to a position corresponding to the precast floor slab 4 through the crane hook 102; S2. The operators on both sides hold the connecting plate 3 and the connecting seat 7 by hand at the same time, and one of the operators presses the pressing block 57, so that the clamping rod 53 exits from the clamping groove 55, and at the same time the supporting block 63 exits from the positioning groove 62; S3. The operator freely pulls the connecting seat 7 in the horizontal direction, so that the distance between the two clamping columns 31 is convenient for installation. At the same time, the connecting seat 7 can also be freely adjusted in the vertical direction, and the clamping columns 31 are quickly inserted into the holes on both sides of the precast floor slab 4; S4. Release the pressing block 57, so that the clamping rod 53 is embedded in the clamping groove 55 again, and the supporting block 63 is inserted into the positioning groove 62 again; S5. Drive the hanging plate 1 to move through the crane hook 102 until the precast floor slab 4 is hoisted to a suitable position, and then repeat step S2, so that the connecting seat 7 can move freely and the clamping columns 31 are taken out of the precast floor slab 4.

[0032] Only certain exemplary embodiments of the present invention have been described by way of illustration above. Without doubt, for those of ordinary skill in the art, the described embodiments can be modified in various different ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of the claims of the present invention.

Claims

1. A construction engineering hoisting device, comprising a hanging plate (1), wherein the four corners of the hanging plate (1) are symmetrically fixedly connected with steel strands (101), and the ends of all the steel strands (101) away from the hanging plate (1) are mounted on a crane hook (102), characterized in that: The two ends of the interior of the hanging plate (1) are slidably connected to an upper straight plate (2) and a lower straight plate (21), respectively; the inner side surface of the hanging plate (1) is rotatably connected to a gear (22); tooth grooves (23) are provided on the sides of the upper straight plate (2) and the lower straight plate (21) facing each other, and two sets of tooth grooves (23) are respectively meshed with the upper and lower ends of the gear (22); A connecting plate (3) is installed at one end of the upper straight plate (2) and the lower straight plate (21) that are away from each other, and a clamping column (31) is fixedly installed on the opposite side of the connecting plates (3), and a prefabricated floor slab (4) is connected between the clamping columns (31) on both sides; A limiting unit is installed on the lower straight plate (21), and the limiting unit is used to limit the relative movement between the upper straight plate (2) and the lower straight plate (21).

2. A construction engineering hoisting equipment according to claim 1, characterized in that: Vertically distributed straight grooves (24) are provided on both sides of the hanging plate (1), and the upper straight plate (2) and the lower straight plate (21) are slidably connected in the two straight grooves (24) respectively.

3. A construction engineering hoisting equipment according to claim 2, characterized in that: The limiting unit comprises a long slot (5) formed inside the lower straight plate (21); a strip plate (51) is slidably connected to the inner side surface of the long slot (5); a return spring (52) is fixedly connected between the strip plate (51) and the inner wall of the long slot (5); vertical slots symmetrically distributed on both sides of the long slot (5) are formed inside the lower straight plate (21); a clamping rod (53) is slidably connected to the inner side surface of the vertical slot; a linkage rod (54) is rotatably connected between the clamping rod (53) and the strip plate (51); when the strip plate (51) moves deeper into the long slot (5), the linkage rod (54) drives the clamping rod (53) to move toward a side close to the strip plate (51); and a plurality of clamping slots (55) adapted to the clamping rod (53) are formed on the inner wall of the straight slot (24).

4. A construction engineering hoisting equipment according to claim 3, characterized in that: A vertical groove (56) is provided on the top of the connecting plate (3); a pressure block (57) is slidably connected to the inner side surface of the vertical groove (56); a driving rod (58) is fixedly connected to the bottom of the pressure block (57); an auxiliary inclined surface (59) is provided at one end of the strip plate (51) close to the driving rod (58); when the driving rod (58) moves downward to press the auxiliary inclined surface (59), the driving rod (58) pushes the strip plate (51) to move deeper into the long groove (5).

5. A construction engineering hoisting equipment according to claim 4, characterized in that: The top of the connecting plate (3) is symmetrically provided with through grooves (6), the inner side surfaces of the through grooves (6) are slidably connected with an adjusting plate (61), the adjusting plate (61) and the two sides of the adjusting plate (61) are equidistantly provided with a plurality of positioning grooves (62) from top to bottom, the inside of the connecting plate (3) is provided with accommodating grooves corresponding to the positioning grooves (62), the inner side surfaces of the accommodating grooves are slidably connected with supporting blocks (63), the supporting blocks (63) and the inner wall of the accommodating grooves are fixedly connected with supporting springs (64), a wire groove (65) is provided between the accommodating groove and the vertical groove (56), a traction wire (66) is fixedly connected between the supporting block (63) and the side surface of the driving rod (58), and when the driving rod (58) moves downward to pull one end of the traction wire (66), the other end of the traction wire (66) pulls the supporting block (63) to withdraw from the inside of the positioning groove (62).

6. A construction engineering hoisting equipment according to claim 5, characterized in that: The traction wire (66) passes through the inside of the wire groove (65), and the width dimension value of the driving rod (58) is smaller than the width dimension value of the pressing block (57).

7. A construction engineering hoisting equipment according to claim 1, characterized in that: The bottom of the connecting plate (3) is fixedly connected to a connecting seat (7), and the clamping column (31) is fixedly connected to the connecting seat (7).

8. A method for using a construction engineering hoisting device, applied to a construction engineering hoisting device according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1, driving the hanging plate (1) to move to a position corresponding to the prefabricated floor slab (4) via a crane hook (102); S2, the operators on both sides simultaneously hold the connecting plate (3) and the connecting seat (7), and the operator on one side presses the pressing block (57), so that the clamping rod (53) withdraws from the clamping slot (55), and at the same time, the supporting clamping block (63) withdraws from the positioning slot (62); S3, the operator freely pulls the connecting seat (7) in the horizontal direction so that the distance between the clamping columns (31) on both sides is convenient for installation. At the same time, the operator can also freely adjust the connecting seat (7) in the vertical direction to quickly insert the clamping columns (31) into the holes on both sides of the prefabricated floor slab (4); S4, releasing the pressing block (57), so that the clamping rod (53) is again embedded in the clamping slot (57), and the supporting clamping block (63) is again inserted into the positioning slot (62); S5, driving the hanging plate (1) to move by means of the crane hook (102) until the prefabricated floor slab (4) is hoisted to a suitable position, and then repeating step S2, so that the connecting seat (7) can move freely, and removing the clamping column (31) from the prefabricated floor slab (4).

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