Measurement setting-out method suitable for core tube without local floor slab

Abstract

The invention discloses a core tube surveying and setting-out method suitable for local non-floor slabs, and belongs to the technical field of building construction. The method specifically comprises the following steps that after formwork removal is conducted on a core tube wall of an operation layer, a set of telescopic leveling assemblies is installed; a laser plumb aligner is placed on the lower layer, laser is made to penetrate through supporting plate pay-off holes in the adjustable supporting plate and the sliding supporting plate, and then the angle of the adjustable supporting plate is adjusted; a laser target is placed on a supporting plate pay-off hole of an adjustable supporting plate, laser of a laser plumb aligner placed on the lower layer is irradiated to the center of the laser target, a total station is erected at a floor pay-off hole in a floor area, and pay-off operation can be normally carried out. One group of telescopic leveling assemblies is changed into two groups of telescopic leveling assemblies which are vertically arranged, a laser target is placed on a lower adjustable supporting plate, and the position of a light spot transmitted from a lower-layer reference point is marked and fixed; a laser plumb aligner is placed on the upper adjustable supporting plate, and laser of the laser plumb aligner is used for plumbing upwards. The technical scheme is used for solving the problem that the layout of a pay-off hole plane is limited under the condition that a core tube floor slab is missing.

Description

Technical Field

[0001] This invention belongs to the field of building construction technology, specifically relating to a method for measuring and setting out the core tube where there is no floor slab. Background Technology

[0002] The core tube is a common lateral force resisting system in high-rise buildings, typically a reinforced concrete structure. During construction, component positioning requires surveying and setting out to minimize deformation errors. A common surveying and setting-out method uses the project's primary control points as a benchmark, horizontally extending to the first floor of the core tube via a plane control network. Elevationally, the control points are projected from the first floor using a laser plumb line through setting-out holes to each floor's construction surface. However, in different construction scenarios, due to design openings, tower crane openings, etc., there may be missing sections of floor slabs within the core tube, making it impossible to pre-reserve setting-out holes on the floor slabs or to find suitable planar locations for measuring instruments such as laser targets and plumb lines. Under these unfavorable conditions, the planar layout of the setting-out holes is limited, often making it impossible to control along the long side axis of the core tube. This not only inconveniences structural construction but also increases the error in core tube surveying and setting out, affecting the construction and quality of the core tube. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide a method for measuring and laying out the core tube where there is no floor slab, so as to solve the problem of limited planar layout of the laying holes when the core tube floor slab is missing.

[0004] To achieve the above objectives, the present invention provides the following technical solution: This invention provides a method for measuring and laying out the core tube structure in areas without floor slabs, comprising the following steps: Step 1: After the core tube wall of the working layer is demolded, make preliminary positioning on the wall of the core tube in the area without floor slab, install a set of telescopic leveling components, and use expansion bolts to firmly connect the two square steel legs of the telescopic leveling components to the core tube wall. Step 2: Place a laser plumb line on the lower layer, level it and position it at the lower layer reference point. Then project the laser onto the working layer. According to the laser position, adjust the position of the sliding plate through the guide rail so that the laser passes through the adjustable plate and the line-laying hole on the sliding plate. Then fix the position of the sliding plate on the guide rail and adjust the angle of the adjustable plate so that the level bubble on both directions is in the middle position. Step 3: Place a laser target on the line-laying hole of the adjustable support plate, so that the laser of the laser plumb line placed on the lower layer is irradiated to the center of the laser target. The position of the laser spot on the laser target is used as the reference point position in the area without a floor slab. Set up a total station at the line-laying hole of the floor slab in the area with a floor slab. Determine the position of the control axis between the two points based on the reference point in the area without a floor slab and the reference point on the lower layer. Then the line-laying operation can be carried out normally. Step 4: After repeating Steps 1 to 3 to achieve the maximum control floor height, change one set of telescopic leveling components in Step 1 to two sets set vertically, and set them with the same wall edge distance. Adjust and fix the positions of the two sets of tray line holes as in Step 2, so that the laser of the laser plumb line instrument placed on the lower layer can pass through the tray line holes in the two sets of telescopic leveling components vertically at the same time. Then adjust the adjustable trays in the two sets of telescopic leveling components to a horizontal position, place the laser target on the lower adjustable tray, mark the position of the light spot transmitted from the lower reference point and fix it, thus completing the vertical transfer of the reference point. Step 5: Place the laser plumb bob on the upper adjustable platform, align it with the reference point recorded on the lower adjustable platform, and use the laser of the laser plumb bob to project the point upwards. Then you can return to Step 1 to carry out the measurement and layout work within the next set of maximum control floor heights.

[0005] Furthermore, in step four, the method for marking and fixing the position of the light spot transmitted from the lower reference point is as follows: when the laser of the laser plumb line projected from the lower reference point acts on the laser target placed on the lower telescopic leveling component, the position of the light spot is recorded by a snap line, thus obtaining the reference point after transmission.

[0006] Furthermore, the telescopic leveling assembly includes a telescopic component and a leveling component. The telescopic component includes symmetrically arranged square steel legs, each of which is equipped with a guide rail. A sliding support plate is provided on the guide rail, and the two sides of the sliding support plate are slidably connected to the guide rail. An adjustable support plate is provided above the sliding support plate, and two bubble level indicators are vertically arranged on the adjustable support plate. The leveling component connects the adjustable support plate to the sliding support plate. Both the sliding support plate and the adjustable support plate have through-holes for placing support plate lines in their middle sections.

[0007] Furthermore, the leveling assembly includes columns disposed at the four corners of the sliding tray. One end of each column is fixed to the sliding tray, and the columns are perpendicular to the sliding tray. Each of the four corners of the adjustable tray has a deflection hole, the diameter of which is larger than the diameter of the column. The four columns are located within the four deflection holes. Each column is fitted with a support spring, the two ends of which are fixed to the sliding tray and the adjustable tray, respectively. A fixing cylinder is disposed on the outer side of the upper end of each deflection hole. The fixing cylinder is fitted onto the column, and one end of which is fixed to the adjustable tray. Several locking screws are provided around the circumference of the fixing cylinder, and these screws are threaded onto the fixing cylinder. The support springs adapt to the changes in the adjustable tray's posture during horizontal position adjustment by stretching, compressing, and bending. The locking screws are fixed to the columns by their threaded ends, thus fixing the position of the adjustable tray after horizontal posture adjustment, thereby achieving horizontal posture adjustment of the adjustable tray.

[0008] Furthermore, the upper end of the column is provided with a rubber column, which is sleeved and fixedly installed on the column, and the end of the locking screw is provided with at least one set of clamping teeth.

[0009] Furthermore, the sliding plate has sliders on both sides, the sliders are slidably connected to the slide rail, the two sides of the sliding plate are respectively fixed to the two sliders, the sliders are provided with limiting screws, the limiting screws are threaded to the sliders, and the end of the limiting screws is set perpendicularly toward the upper surface of the slide rail.

[0010] Furthermore, the square steel leg is provided with several leg end plates, which are fixed to the square steel leg. Several expansion bolts are provided on the leg end plates to fix the square steel leg to the core tube wall.

[0011] Furthermore, the cable tray cable release hole is a square hole with a side length of 150mm.

[0012] The beneficial effects of this invention are as follows: In this technical solution, telescopic leveling components are installed on the shear wall surface in the core tube area without floor slabs. The sliding bracket and adjustable bracket serve as a platform, providing a stable installation position for measurement and layout equipment such as laser targets and laser plumb bobs. This provides a feasible and convenient operation solution for measurement and layout work in the core tube area without floor slabs. Furthermore, the components are easy to dismantle after the measurement work is completed, and some of the telescopic leveling components can be reused.

[0013] Compared with the prior art, the present invention has the following advantages and outstanding effects: (1) The telescopic leveling component set in the present invention is simple in composition, convenient in construction process, and stable in force; (2) It occupies less space in the construction site, is not affected by other construction machinery and equipment, and is flexible in layout; (3) The present invention is easy to dismantle and can be used repeatedly in multiple surveying and setting-out operation layers; (4) The present invention can adjust the position and level of the adjustable plate through the cooperation of the sliding component and the leveling component, which can meet the needs of use in a variety of complex scenarios.

[0014] Other advantages, objectives, and features of the invention will be set forth in the following description and will be apparent to those skilled in the art in some respects, or may be learned by practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0015] To make the objectives, technical solutions, and beneficial effects of this invention clearer, the following figures are provided for illustration: Figure 1 This is a flowchart illustrating the core tube measurement and layout method of the present invention. Figure 2This is a three-dimensional schematic diagram of the telescopic leveling component acting inside the core tube in the core tube measurement and laying method of the present invention; Figure 3 This is a three-dimensional schematic diagram of the telescopic leveling component in the core tube measurement and laying method of the present invention; Figure 4 This is a schematic cross-sectional view of the telescopic leveling component in the core tube measurement and laying method of the present invention.

[0016] The following labels are shown in the attached diagram: 1. Core tube; 2. Floor slab layout hole; 3. Lower floor reference point; 4. Laser; 5. Square steel support leg; 6. Support leg end plate; 7. Slide rail; 8. Sliding support plate; 9. Slider; 10. Adjustable support plate; 11. Support plate layout hole; 12. Limiting screw; 13. Column; 14. Rubber sleeve; 15. Support spring; 16. Fixing cylinder; 17. Locking screw; 18. Deflection hole. Detailed Implementation

[0017] like Figures 1-4 As shown, the present invention provides a method for measuring and laying out the core tube in areas without floor slabs, comprising the following steps: Step 1, Equipment Installation: After the core tube 1 wall of the working layer is demolded, the initial positioning is carried out on the wall of the core tube 1 in the area without floor slab, a set of telescopic leveling components is installed, and the two square steel legs 5 in the telescopic leveling components are firmly connected to the core tube 1 wall through expansion bolts. The horizontal positioning of the square steel support leg 5 is determined based on the distance between the lower reference point 3 and the wall edge. The vertical positioning is selected based on the on-site measurement conditions to ensure unobstructed front and rear views. During installation, the support leg is roughly adjusted to be horizontal by controlling the connection position between the control end plate and the shear wall of the core tube 1.

[0018] Step 2, Equipment Adjustment: Place the laser 4 plumb bob on the lower layer, level it and position it at the lower layer reference point 3. Then project the laser 4 onto the working layer. According to the position of the laser 4, adjust the position of the sliding plate 8 through the guide rail so that the laser 4 passes through the adjustable plate 10 and the line-laying hole 11 on the sliding plate 8. Then fix the position of the sliding plate 8 on the guide rail. Then adjust the angle of the adjustable plate 10 so that the level bubble on both directions is in the middle position. Step 3, measurement and layout operation: Place the laser target on the layout hole 11 of the adjustable support plate 10, so that the laser 4 of the laser 4 plumb line placed on the lower layer is irradiated to the center of the laser target. That is, the position of the laser spot on the laser target is used as the reference point position in the area without floor slab. Set up the total station at the layout hole 2 of the floor slab in the area with floor slab. Determine the position of the control axis between the two points according to the reference point in the area without floor slab and the reference point 3 on the lower layer, and the layout operation can be carried out normally. After the control axis is laid out between the reference point in the area without floor slab and the reference point 2 with floor slab, the expansion and leveling components can be removed as needed on site and transferred to the next working layer for repeated use.

[0019] Step 4, reference point transfer operation: After repeating the above steps 1 to 3 to reach the maximum control floor height, change one set of telescopic leveling components in step 1 to two sets set vertically, and set them with the same wall edge distance. Adjust and fix the position of the two sets of tray line holes 11 according to step 2, so that the laser 4 of the laser 4 plumb bob placed on the lower layer can pass through the tray line holes 11 in the two sets of telescopic leveling components vertically at the same time. Then adjust the adjustable trays 10 in the two sets of telescopic leveling components to a horizontal position, place the laser target on the lower adjustable tray 10, mark the position of the light spot transmitted from the lower reference point 3 and fix it, thus completing the vertical transfer of the reference point. One set of telescopic leveling components was changed to two sets. The two sets of telescopic leveling components are kept in the same plane position to meet the laser 4 penetration requirement of the laser 4 plumb line. The vertical height difference is about 1m, which meets the centering distance requirement of the measuring equipment above.

[0020] Step 5: Place the laser 4 plumb bob on the upper adjustable plate 10, align (center and level) with the reference point recorded on the lower adjustable plate 10 after transfer, and use the laser 4 of the laser 4 plumb bob to project the point upwards. Then you can return to step 1 to carry out the next set of measurement and layout operations within the maximum control floor height.

[0021] After the vertical transfer of each floor's reference point and the upward projection of the laser 4 are completed, the two sets of telescopic leveling components cannot be removed. In the subsequent measurement and layout work of the upper floors, the tray layout hole 11 needs to be used repeatedly. Therefore, it needs to be protected during this period to prevent the guide rail buckle of the lower tray layout hole 11 from loosening or the bracket equipment from being damaged.

[0022] In one feasible approach, in step four, the position of the light spot transmitted from the lower reference point 3 is marked and fixed as follows: when the laser 4 of the vertical alignment instrument projected from the lower reference point acts on the laser target placed on the lower telescopic leveling component, the position of the light spot is recorded by a snap line, thus obtaining the reference point after transmission.

[0023] In one feasible embodiment, the telescopic leveling assembly includes a telescopic component and a leveling component. The telescopic component includes symmetrically arranged square steel legs 5, each of which is equipped with a guide rail. A sliding support plate 8 is provided on the guide rail, with both sides of the sliding support plate 8 slidably connected to the guide rail. An adjustable support plate 10 is provided above the sliding support plate 8, and two bubble level instruments are vertically arranged on the adjustable support plate 10. The leveling component connects the adjustable support plate 10 to the sliding support plate 8. Both the sliding support plate 8 and the adjustable support plate 10 have through-holes 11 for placing support plates.

[0024] The telescopic leveling component disclosed in this technical solution can adjust the position of the sliding plate 8 according to the actual thickness of the shear wall of the lower reference point 3 and the core tube 1 by moving the sliding plate 8 on the guide rail. Then, the leveling component can adjust the levelness of the adjustable plate 10, so that the adjustable plate 10 can be flexibly arranged in different application scenarios to adapt to various construction scenarios.

[0025] In one feasible embodiment, the leveling assembly includes uprights 13 positioned at the four corners of the sliding support plate 8. One end of each upright is fixed to the sliding support plate 8, and the uprights 13 are perpendicular to the sliding support plate 8. Each of the four corners of the adjustable support plate 10 has a deflection hole 18, the diameter of which is larger than the diameter of the upright 13. The four uprights 13 are located within the four deflection holes 18. Each upright 13 is fitted with a support spring 15, the two ends of which are fixed to the sliding support plate 8 and the adjustable support plate 10, respectively. A fixing cylinder 16 is provided on the outer side of the upper end of each deflection hole 18. The fixed cylinder 16 is sleeved on the column 13, and one end of the fixed cylinder 16 is fixed to the adjustable support plate 10. Several locking screws 17 are provided on the circumference of the fixed cylinder 16. The locking screws 17 are threadedly connected to the fixed cylinder 16. The support spring 15 adapts to the posture changes of the adjustable support plate 10 during the horizontal position adjustment process by stretching, compressing and bending itself. The locking screws 17 are fixed to the column 13 by the threaded end, so as to fix the position of the adjustable support plate 10 after the horizontal posture adjustment is completed, thereby realizing the horizontal posture adjustment of the adjustable support plate 10.

[0026] The specific working principle of the telescopic leveling component for adjusting the position and levelness of the adjustable tray 10 is as follows: The position adjustment method of the adjustable support plate 10 is as follows: After the square steel support leg 5 is fixed on the shear wall, the adjustable support plate 10 and the sliding support plate 8 are moved to the upper part of the lower reference point 3 by moving the sliding support plate 8 on the guide rail, which facilitates the subsequent calibration and layout operation. The horizontal attitude adjustment method for the adjustable support plate 10 is as follows: It should be noted in advance that during the installation of the telescopic leveling component, unevenness of the shear wall surface or installation errors will cause the adjustable support plate 10 to be not in a horizontal state after installation. This will affect the subsequent setting of the laser target and the confirmation of the reference point. Therefore, it is necessary to adjust the horizontal attitude of the adjustable support plate 10. Therefore, the specific adjustment method is as follows: after the sliding support plate 8 slides to the designated position, the operator manually adjusts the attitude of the adjustable support plate 10 so that the bubble of the bubble level on it is centered. Then, by rotating the locking screw 17, the end of the locking screw 17 is pressed against the column 13, and the adjusted horizontal attitude of the adjustable support plate 10 is locked.

[0027] It should be further explained that since the column 13 is fixed to the sliding support plate 8, and the sliding support plate 8 is in a non-horizontal state, in the initial state, under the action of the support spring 15, the adjustable support plate 10 is also in a non-horizontal state. Therefore, when the level of the adjustable support plate 10 is manually adjusted, due to the setting of the deflection hole 18, the adjustable support plate 10 can deflect on the column 13, that is, the column 13 will tilt and be located inside the fixed cylinder 16. Therefore, at this time, it is only necessary to rotate the locking screw 17 to abut against the column 13. The adjustable tray 10 can be fixed to the column 13 by the tightening torque. Since the screwing depth of the locking screw 17 is different, it can contact the inclined column 13 and maintain the horizontal posture of the adjustable tray 10 after contact and locking. Of course, it is easy to understand that the setting of the support spring 15 can change with the position or angle of the adjustable tray 10, that is, while ensuring that the adjustable tray 10 is connected to the sliding tray 8 as a whole, it will not interfere with the adjustment of the horizontal posture of the adjustable tray 10.

[0028] In one feasible embodiment, a rubber post 14 is provided at the upper end of the column 13. The rubber post 14 is sleeved and fixedly installed on the column 13. The end of the locking screw 17 is provided with at least one set of clamping teeth. The clamping teeth can be embedded in the rubber post 14 to ensure the clamping effect and prevent slippage.

[0029] In one feasible embodiment, the sliding plate 8 has sliders 9 on both sides, which are slidably connected to the slide rail 7. Each side of the sliding plate 8 is fixed to one of the two sliders 9. Each slider 9 has a limiting screw 12 threadedly connected to it, with its end perpendicularly facing the upper surface of the slide rail 7. The limiting screw 12 locks the sliding of the sliders 9, thereby fixing the position of the sliding plate 8.

[0030] In one feasible embodiment, the square steel leg 5 is provided with several leg end plates 6, which are fixed to the square steel leg 5. Several expansion bolts are provided on the leg end plates 6 to fix the square steel leg 5 to the core tube 1 wall. This is one method of fixing the square steel leg 5; other methods can also be used, which will not be elaborated upon here. In another feasible embodiment, the cable tray hole 11 is a square hole with a side length of 150mm.

[0031] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of the present invention.

Claims

1. A method for measuring and setting out the core tube structure suitable for areas without floor slabs, characterized in that: Includes the following steps: Step 1: After the core tube (1) wall of the working layer is demolded, a preliminary positioning is made on the wall of the core tube (1) without floor slab, a set of telescopic leveling components is installed, and the two square steel legs (5) in the telescopic leveling components are firmly connected to the core tube (1) wall by expansion bolts. Step 2: Place the laser (4) plumb line instrument on the lower layer, level it and position it at the lower layer reference point (3), then project the laser (4) onto the working layer. According to the position of the laser (4), adjust the position of the sliding plate (8) through the guide rail so that the laser (4) passes through the adjustable plate (10) and the line hole (11) on the sliding plate (8). Then fix the position of the sliding plate (8) on the guide rail and adjust the angle of the adjustable plate (10) so that the level bubble on both directions is in the middle position. Step 3: Place a laser target on the line-laying hole (11) of the adjustable support plate (10), so that the laser (4) of the vertical alignment instrument placed on the lower layer irradiates the center of the laser target. That is, the position of the light spot on the laser target is used as the reference point position of the area without floor slab. Set up a total station at the line-laying hole (2) of the floor slab area. Determine the position of the control axis between the two points according to the reference point of the area without floor slab and the reference point (3) of the lower layer, and then the line-laying operation can be carried out normally. Step 4: After performing the cycle operation according to Step 1 to Step 3 to reach the maximum control floor height, change one set of telescopic leveling components in Step 1 to two sets set vertically, and set them according to the same wall edge distance. Adjust and fix the position of the two sets of tray line holes (11) according to Step 2, so that the laser (4) of the vertical alignment instrument placed on the lower layer can pass through the tray line holes (11) in the two sets of telescopic leveling components vertically at the same time. Then adjust the adjustable tray (10) in the two sets of telescopic leveling components to the horizontal posture, place the laser target on the lower adjustable tray (10), mark the position of the light spot transmitted from the lower reference point (3) and fix it, thus completing the vertical transfer of the reference point; Step 5: Place the laser (4) plumb line on the upper adjustable plate (10), align it with the reference point recorded on the lower adjustable plate (10) after the transfer, and use the laser (4) of the laser (4) plumb line to project the point upwards. Then you can return to step 1 to carry out the measurement and layout work within the next set of maximum control layer heights.

2. The method for measuring and laying out core tubes suitable for areas without floor slabs, as described in claim 1, is characterized in that: In step four, the method for marking and fixing the position of the light spot transmitted from the lower reference point (3) is as follows: when the laser (4) projected from the lower reference point acts on the laser target placed on the lower telescopic leveling component, the position of the light spot is recorded by a snap line, thus obtaining the reference point after transmission.

3. The method for measuring and laying out core tubes suitable for areas without floor slabs, as described in claim 1, is characterized in that: The telescopic leveling assembly includes a telescopic assembly and a leveling assembly. The telescopic assembly includes symmetrically arranged square steel legs (5). Each square steel leg (5) is provided with a guide rail. A sliding support plate (8) is provided on the guide rail. The two sides of the sliding support plate (8) are slidably connected to the guide rail. An adjustable support plate (10) is provided above the sliding support plate (8). Two bubble level instruments are vertically arranged on the adjustable support plate (10). The leveling assembly connects the adjustable support plate (10) to the sliding support plate (8). Both the sliding support plate (8) and the adjustable support plate (10) are provided with through-hole support plate line holes (11).

4. The method for measuring and laying out core tubes suitable for areas without floor slabs, as described in claim 3, is characterized in that: The leveling assembly includes columns (13) located at the four corners of the sliding support plate (8). One end of each column (13) is fixed to the sliding support plate (8), and the columns (13) are perpendicular to the sliding support plate (8). Each of the four corners of the adjustable support plate (10) has a deflection hole (18), the diameter of which is larger than the diameter of the column (13). The four columns (13) are located within the four deflection holes (18). Each column (13) is fitted with a support spring (15), the two ends of which are fixed to the sliding support plate (8) and the adjustable support plate (10), respectively. A fixing cylinder is provided on the outer side of the upper end of each deflection hole (18). 16), the fixed cylinder (16) is sleeved on the column (13), and one end of the fixed cylinder (16) is fixed on the adjustable plate (10). The fixed cylinder (16) is provided with several locking screws (17) around its circumference. The locking screws (17) are threadedly connected to the fixed cylinder (16). The support spring (15) adapts to the posture change of the adjustable plate (10) during the horizontal position adjustment process by stretching, compressing and bending itself. The locking screws (17) are fixed to the column (13) by the threaded end to fix the position of the adjustable plate (10) after the horizontal posture adjustment is completed, thereby realizing the horizontal posture adjustment of the adjustable plate (10).

5. The method for measuring and laying out core tubes suitable for areas without floor slabs, as described in claim 4, is characterized in that: The upper end of the column (13) is provided with a rubber column (14), which is sleeved and fixed on the column (13). The end of the locking screw (17) is provided with at least one set of clamping teeth.

6. A method for measuring and laying out core tubes suitable for areas without floor slabs, as described in claim 3, characterized in that: The sliding plate (8) has sliders (9) on both sides. The sliders (9) are slidably connected to the slide rail (7). The two sides of the sliding plate (8) are respectively fixed to the two sliders (9). The sliders (9) are provided with limiting screws (12). The limiting screws (12) are threadedly connected to the sliders (9), and the end of the limiting screws (12) is set vertically toward the upper surface of the slide rail (7).

7. The method for measuring and laying out core tubes suitable for areas without floor slabs, as described in claim 3, is characterized in that: The square steel leg (5) is provided with several leg end plates (6), the leg end plates (6) are fixed on the square steel leg (5), and the leg end plates (6) are provided with several expansion bolts, the expansion bolts are used to fix the square steel leg (5) to the core tube (1) wall.

8. A method for measuring and laying out core tubes suitable for areas without floor slabs, as described in claim 2, characterized in that: The cable tray cable release hole (11) is a square hole with a side length of 150mm.

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