Mounting and dismounting method of tower type supporting frame

Abstract

The invention relates to the technical field of building construction supports, in particular to a mounting and dismounting method of a tower type supporting frame, and the mounting method specifically comprises the steps that a supporting unit is positioned at a preset mounting position of a building main body structure, and an adjustable support is mounted at the top of the supporting unit; a hydraulic lifting system is used for supporting the supporting unit and lifting the supporting unit; the bottom of the previous supporting unit is rigidly connected with the next supporting unit; enabling the hydraulic lifting system to descend, enabling the bottom of the lower supporting unit to be grounded, and then switching a supporting point of the hydraulic lifting system to enable the hydraulic lifting system to be separated from the upper supporting unit; the hydraulic lifting system is lifted, the supporting unit below the hydraulic lifting system is lifted, the next supporting unit is installed, and the installation steps of the supporting units are repeated till the height required by the project is reached; and the hydraulic lifting system is withdrawn after the adjustable base is mounted on the supporting unit at the bottom. High-altitude operation is not needed, potential safety hazards are reduced, and the construction efficiency is also improved.

Description

Technical Field

[0001] This invention relates to the field of building construction support technology, and more specifically, to a method for installing and dismantling a tower support frame. Background Technology

[0002] Tower support frames are widely used in the construction industry due to their high load-bearing capacity, high construction efficiency, good stability, and wide applicability. However, the installation and dismantling of traditional tower support frames rely on manual high-altitude operations, which are inefficient, unsafe, and result in long overall construction cycles, failing to meet the demands of efficient project construction. Summary of the Invention

[0003] The purpose of this invention is to overcome the problems of unsafety and low construction efficiency caused by high-altitude operations required for the installation and dismantling of tower support frames. It provides a method for installing and dismantling tower support frames that can be completed on the ground, greatly reducing safety hazards and improving construction efficiency at the same time.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] A method for installing a tower support frame, the tower support frame comprising multiple support units that are detachably connected in sequence, adjacent support units being connected by a pin assembly, the top of the top support unit being equipped with an adjustable support, and the bottom support unit being equipped with an adjustable base; the installation method of the tower support frame specifically includes the following steps:

[0006] S11. Position a support unit at a preset installation position on the main structure of the building and install an adjustable support on its top.

[0007] S12. Use a hydraulic lifting system to support the support unit and raise it to a preset installation height H;

[0008] S13. The bottom of the previous support unit is rigidly connected to the next support unit by means of a pin assembly;

[0009] S14. Lower the hydraulic lifting system so that the bottom of the lower support unit is grounded. Then switch the support point of the hydraulic lifting system so that it is detached from the upper support unit and supports the lower support unit.

[0010] S15. Raise the hydraulic lifting system and raise the lower support unit to the preset installation height H, and then install the next support unit. Repeat S12 to S14 until the required height for the project is reached.

[0011] S16. After installing the adjustable base at the bottom of the support unit, remove the hydraulic lifting system.

[0012] The installation method of the tower support frame of this invention differs from the traditional bottom-up installation method. This invention adopts a top-down installation approach. Compared to the traditional method, this invention first uses a hydraulic lifting system to lift the top support unit, and then installs the next layer of support units from the bottom. Then, the installed parts are lifted and installed from below. Throughout the entire installation process, construction workers work on the ground. In contrast, the traditional bottom-up installation method first places the bottom support unit on the ground, and then installs on top of it, continuously stacking upwards. Once a certain height is reached, construction workers need to work at height. This invention can significantly reduce the amount of work at height, and the efficiency of ground installation is higher than that of high-altitude installation. Therefore, this invention can also shorten the construction cycle and is particularly suitable for the rapid construction and safe recovery of support systems for large-span structures, reducing overall construction costs.

[0013] Furthermore, the pin assembly includes a positioning tube and two pins. Two adjacent support units are respectively inserted into both ends of the positioning tube. The two pins are located at both ends of the positioning tube and pass through the positioning tube to insert into the support units. The positioning tube is used to position and connect adjacent upper and lower support units, and the pins are used to lock and fix the positioning tube and the support units, thereby preventing relative movement between the support units and the positioning tube.

[0014] Furthermore, the pin assembly also includes an anti-disengagement clip connected in series at both ends of the pin. The anti-disengagement clip prevents the pin from falling out, thereby ensuring that the relative position of the support unit and the positioning tube remains unchanged.

[0015] Furthermore, the support unit includes two symmetrically arranged support frame assemblies, a connecting frame, and a diagonal tie rod. The two support frame assemblies are connected by the connecting frame and the diagonal tie rod, respectively. The support frame assemblies mainly provide support, while the connecting frame and the diagonal tie rod connect the two support frame assemblies and both provide reinforcement to increase the stability of the support unit and improve its support and deformation resistance.

[0016] The installation method of the support frame assembly specifically includes the following steps:

[0017] S21. Place the two support frame assemblies symmetrically and place the connecting frame horizontally, so that the two ends of the connecting frame are respectively connected to the upper parts of the two support frame assemblies.

[0018] S22. The tie rod is placed at an angle, with one end of the tie rod connected to the upper part of one of the support frame assemblies and the other end of the tie rod connected to the lower part of another support frame assembly.

[0019] The connecting frame and the diagonal brace connect the two support frame assemblies at different positions, allowing the support unit to withstand forces in different directions when under stress. The connecting frame withstands forces in the horizontal direction, while the diagonal brace can withstand forces in the inclined direction.

[0020] Furthermore, the support frame assembly includes two symmetrically arranged uprights and several horizontal bars arranged sequentially from top to bottom. Each horizontal bar is connected to one of the two uprights at both ends. In steps S12 and S14, when the hydraulic lifting system is used to support the support unit, the force is applied to the top horizontal bar. The uprights provide support in the height direction, while the horizontal bars serve both to connect the uprights and to strengthen the support performance between the two uprights, thereby improving the stability and deformation resistance of the support frame assembly.

[0021] Furthermore, in step S13, the support frame assemblies of two adjacent support units are vertically arranged. During installation, after installing one support unit, when installing the next support unit, the support unit is rotated 90 degrees in the horizontal plane before installation, so that the support frame assemblies of two adjacent support units are vertically arranged, which helps to improve the overall support capacity of the tower support frame.

[0022] Furthermore, the adjustable support includes a top plate, a top rod, and a first locking nut arranged sequentially. The top plate is mounted on top of the top rod, the top rod is inserted into the support unit, and the first locking nut is threadedly connected to the top rod and abuts against the support unit. The top plate is used to directly contact the building and provide support; the top rod is used to connect the top plate to the support unit; the height of the top plate can be adjusted by adjusting the relative position of the top rod and the support unit, and then locked using the first locking nut after adjustment.

[0023] Furthermore, limiting posts are provided at the four corners of the top plate, forming a U-shaped structure with the top plate. The limiting posts create recesses between themselves and the top plate, which can limit the movement of beams and other structural elements, reducing movement of the tower support frame when supporting the building and providing more stable support.

[0024] Furthermore, the adjustable base includes a second locking nut, a base column, and a base plate arranged sequentially. The base plate is installed at the bottom of the base column, and the base column is inserted into the support unit. The second locking nut is threadedly connected to the base column and abuts against the support unit. The base plate contacts the ground to increase the contact area, making the entire tower support frame more stable. The base column serves two purposes: connecting the support unit and the base plate, and adjusting the relative position of the support unit and the base plate to allow for height adjustment. After adjusting the relative position of the base column and the support unit, the second locking nut is used to lock the base column, thereby fixing the position of the adjustable base and preventing any further change in its height relative to the support unit.

[0025] The present invention also provides a method for disassembling a tower support frame, specifically including the following steps:

[0026] S31. Move the hydraulic lifting system to the tower support frame and use the hydraulic lifting system to support the support unit at the bottom;

[0027] S32. Raise the hydraulic lifting system to move the adjustable base off the ground;

[0028] S33. Remove the adjustable base;

[0029] S34. Lower the hydraulic lifting system so that the support unit near the ground is lowered to contact the ground, and replace the support point of the hydraulic lifting system with the support unit of the upper level.

[0030] S35. Raise the hydraulic lifting system to move the bottom support unit off the ground;

[0031] S36. Remove the bottom support unit;

[0032] S37. Repeat steps S34 to S36 until all support units are removed.

[0033] The dismantling method of the tower support frame of the present invention is the reverse process of the installation method of the tower support frame. Unlike the traditional top-down dismantling operation, the dismantling of the tower support frame in the present invention is carried out from bottom to top. The adjustable base is dismantled first using a hydraulic lifting system, and then the support unit at the bottom is dismantled. After dismantling, the position of the upper components is adjusted so that the support unit of the second to last layer is moved down. Throughout the dismantling process, the construction personnel always operate on the ground and there is no need for high-altitude work. The present invention can significantly reduce the amount of high-altitude work, and the efficiency of ground dismantling is higher than that of high-altitude dismantling. Therefore, the present invention can also shorten the construction cycle.

[0034] The beneficial effects of this invention are as follows:

[0035] This invention employs a progressive process during installation: "assembling the top layer first, lifting it using a hydraulic lifting system, and then modularly expanding the lower layers." During dismantling, it follows a reverse sequence: "dismantling the bottom layer first, then slowly lowering it using a hydraulic lifting system, and finally dismantling it layer by layer." Compared to traditional methods, this invention reduces the amount of work at height, shortens the construction period, and is particularly suitable for the rapid construction and safe recovery of support systems for large-span structures, thus reducing overall construction costs. Attached Figure Description

[0036] Figure 1 This is a schematic diagram illustrating the installation steps of an installation method for a tower support frame according to the present invention.

[0037] Figure 2This is a structural diagram of the tower support frame of the present invention.

[0038] Figure 3 This is a structural diagram of the support unit and adjustable support of the present invention.

[0039] Figure 4 This is a structural diagram of the support frame assembly of the present invention.

[0040] Figure 5 This is a structural diagram of the pin assembly of the present invention.

[0041] Figure 6 This is a structural diagram of the adjustable base of the present invention.

[0042] The markings in the diagram are explained as follows:

[0043] 1. Support unit; 11. Support frame assembly; 111. Upright pole; 112. Horizontal bar; 12. Connecting frame; 13. Diagonal tie rod; 2. Pin assembly; 21. Positioning tube; 22. Pin; 23. Anti-disengagement buckle; 3. Adjustable support; 31. Top plate; 311. Limiting post; 32. Top rod; 33. First locking nut; 4. Adjustable base; 41. Second locking nut; 42. Base column; 43. Base plate; 5. Hydraulic lifting system; H is the preset installation height. Detailed Implementation

[0044] The accompanying drawings are for illustrative purposes only and should not be construed as limiting this patent. To better illustrate this embodiment, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings. The positional relationships described in the drawings are for illustrative purposes only and should not be construed as limiting this patent.

[0045] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "long," and "short" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0046] The technical solution of the present invention will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0047] Example 1

[0048] like Figure 1The image shows an embodiment of an installation method for a tower support frame according to the present invention. Figures 2 to 6 The tower support frame includes multiple support units 1 that are detachably connected in sequence. Adjacent support units 1 are connected by a pin assembly 2. The top of the top support unit 1 is equipped with an adjustable support 3, and the bottom support unit 1 has an adjustable base 4 at its bottom. The installation method of the tower support frame specifically includes the following steps:

[0049] S11. Position a support unit 1 at a preset installation position on the main structure of the building and install an adjustable support 3 on its top.

[0050] S12. Use the hydraulic lifting system 5 to support the support unit 1 and raise it to the preset installation height H;

[0051] S13. The bottom of the previous support unit 1 is rigidly connected to the next support unit 1 by means of the pin assembly 2;

[0052] S14. Lower the hydraulic lifting system 5 so that the bottom of the lower support unit 1 is grounded. Then switch the support point of the hydraulic lifting system 5 so that it is detached from the upper support unit 1 and supports the lower support unit 1.

[0053] S15. Raise the hydraulic lifting system 5 and raise the lower support unit 1 to the preset installation height H, and then install the next support unit 1. Repeat S12 to S14 until the required height for the project is reached.

[0054] S16. After installing the adjustable base 4 at the bottom of the support unit 1, remove the hydraulic lifting system 5.

[0055] The preset installation height H can be set as needed to allow for adjustment margins for components during installation.

[0056] As an improvement to this embodiment, see Figure 2 The adjustable support 3 includes a top plate 31, a top rod 32, and a first locking nut 33 arranged sequentially. The top plate 31 is mounted on top of the top rod 32, which is inserted into the support unit 1. The first locking nut 33 is threadedly connected to the top rod 32 and abuts against the support unit 1. Limiting posts 311 are provided at the four corners of the top plate 31, forming a U-shaped structure with the top plate 31. See [link / description]. Figure 6 The adjustable base 4 includes a second locking nut 41, a base column 42, and a base plate 43 arranged in sequence. The base plate 43 is installed at the bottom of the base column 42. The base column 42 is inserted into the support unit 1. The second locking nut 41 is threadedly connected to the base column 42 and abuts against the support unit 1.

[0057] As an improvement to this embodiment, see Figure 5The pin assembly 2 includes a positioning tube 21 and two pins 22. Two adjacent support units 1 are respectively inserted into both ends of the positioning tube 21. The two pins 22 are located at both ends of the positioning tube 21, and each pin 22 passes through the positioning tube 21 and is inserted into the support unit 1. The pin assembly 2 also includes an anti-disengagement buckle 23, which is connected in series to both ends of the pins 22. The support unit 1 includes two symmetrically arranged support frame assemblies 11, a connecting frame 12, and a diagonal tie rod 13. The two support frame assemblies 11 are connected by the connecting frame 12 and the diagonal tie rod 13, respectively. The installation method of the support frame assembly 11 specifically includes the following steps:

[0058] S21. Place the two support frame assemblies 11 symmetrically and the connecting frame 12 horizontally, so that the two ends of the connecting frame 12 are connected to the upper part of the two support frame assemblies 11 respectively.

[0059] S22. The diagonal tie rod 13 is placed at an angle, with one end of the diagonal tie rod 13 connected to the upper part of one of the support frame assemblies 11 and the other end of the diagonal tie rod 13 connected to the lower part of another support frame assembly 11.

[0060] As an improvement to this embodiment, see Figure 4 The support frame assembly 11 includes two symmetrically arranged uprights 111 and several horizontal bars 112 arranged sequentially from top to bottom. The two ends of the horizontal bars 112 are respectively connected to the two uprights 111. When the hydraulic lifting system 5 is used to support the support unit 1 in steps S12 and S14, the force is applied to the top horizontal bar 112.

[0061] Installation Process: In actual construction, firstly, according to the design requirements, measure and determine the preset installation positions of the two support frame components 11 to ensure accurate positioning. Then, install the adjustable support 3 at the top. Next, use the connecting frame 12 and the diagonal tie rod 13 to firmly connect the two support frame components 11, forming support unit 1. Install the hydraulic lifting system 5 on the crossbars 112 of the two support frame components 11 in support unit 1. Start the hydraulic lifting system 5 and slowly lift the support unit to the preset installation height H. During the lifting process, closely monitor the status of support unit 1 to ensure its smooth ascent. When support unit 1 reaches the target position, stop lifting and use the positioning tube 21 and pin 22 at its bottom to install the next layer of support unit 1. After completing the above steps, lower the entire unit to the ground, change the support point of the hydraulic lifting system 5 to the crossbar 112 of the lowest support unit 1, and repeat the steps of lifting, installing, lowering, and changing support points until the required height for the project is reached. Finally, an adjustable base 4 is installed at the bottom of the lowest support unit 1, and the verticality of the tower support frame is adjusted by the adjustable base 4 to ensure that the stability and verticality of the entire tower support frame meet the construction standards, and the hydraulic lifting system 5 is removed.

[0062] The installation method of the tower support frame of this invention differs from the traditional bottom-up installation method. This invention adopts a top-down installation approach. Compared to the traditional method, this invention first uses a hydraulic lifting system 5 to lift the top support unit 1, and then installs the next layer of support units 1 from the bottom. Then, the installed parts are lifted and installed below. Throughout the entire installation process, construction workers work on the ground. In contrast, the traditional bottom-up installation method first places the bottom support unit 1 on the ground, and then installs on top of it, continuously stacking upwards. Once a certain height is reached, construction workers need to work at height. This invention can significantly reduce the amount of work at height, and the efficiency of ground installation is higher than that of high-altitude installation. Therefore, this invention can also shorten the construction cycle and is particularly suitable for the rapid construction and safe recovery of support systems for large-span structures, reducing overall construction costs.

[0063] Example 2

[0064] The following is another embodiment of the installation method of a tower support frame of the present invention. This embodiment is similar to embodiment 1, except that the support frame components 11 of two adjacent support units 1 are arranged vertically in step S13.

[0065] During installation, after installing the upper support unit 1, when installing the next support unit 1, rotate the support unit 1 90 degrees in the horizontal plane before installation, so that the support frame assemblies 11 of the two adjacent support units 1 are set vertically, which helps to improve the overall support capacity of the tower support frame.

[0066] Example 3

[0067] This embodiment is an example of a method for disassembling a tower support frame, specifically including the following steps:

[0068] S31. Move the hydraulic lifting system 5 to the tower support frame and use the hydraulic lifting system 5 to support the support unit 1 at the bottom;

[0069] S32. Raise the hydraulic lifting system 5 to move the adjustable base 4 off the ground;

[0070] S33. Remove adjustable base 4;

[0071] S34. Lower the hydraulic lifting system 5 so that the support unit 1 near the ground is lowered to contact the ground, and change the support point of the hydraulic lifting system 5 to the support unit 1 of the upper level.

[0072] S35. Raise the hydraulic lifting system 5 to move the bottom support unit 1 off the ground;

[0073] S36. Remove the bottom support unit 1;

[0074] S37. Repeat steps S34 to S36 until all support units 1 are removed.

[0075] Dismantling Process: During dismantling, activate the hydraulic lifting system 5 and place its support point on the horizontal bar 112 of the lowest support unit 1. Then, lift the entire tower support frame off the ground. First, remove the adjustable base 4 at the bottom, then lower the tower support frame back to the ground. Replace the support point of the hydraulic lifting system 5 on the horizontal bar 112 of the next upper support unit 1. Then, dismantle the next lower support unit 1. Repeat this process to gradually dismantle the entire tower support frame. During the dismantling process, strictly follow the operating procedures to ensure the safe and orderly progress of the dismantling work.

[0076] The dismantling method of the tower support frame of the present invention is the reverse process of the installation method of the tower support frame. When dismantling the tower support frame, unlike the traditional top-down dismantling operation, the dismantling of the tower support frame of the present invention is carried out from bottom to top. The adjustable base 4 is dismantled first using the hydraulic lifting system 5, and then the bottom support unit 1 is dismantled. After dismantling, the position of the upper components is adjusted so that the second-to-last support unit 1 is moved down. Throughout the dismantling process, the construction personnel always operate on the ground and there is no need for high-altitude operations. The present invention can significantly reduce the amount of high-altitude operations, and the efficiency of ground dismantling is higher than that of high-altitude dismantling. Therefore, the present invention can also shorten the construction cycle.

[0077] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A method for installing a tower support frame, characterized in that, The tower support frame includes multiple support units (1) that are detachably connected in sequence. Two adjacent support units (1) are connected by a pin assembly (2). The top of the top support unit (1) is equipped with an adjustable support (3), and the bottom support unit (1) is equipped with an adjustable base (4). The installation method of the tower support frame specifically includes the following steps: S11. Position a support unit (1) at the preset installation position of the main building structure and install an adjustable support (3) on its top; S12. Use the hydraulic lifting system (5) to support the support unit (1) and raise it to the preset installation height H; S13. The bottom of the previous support unit (1) is rigidly connected to the next support unit (1) by means of a pin assembly (2); S14. Lower the hydraulic lifting system (5) so that the bottom of the lower support unit (1) is grounded. Then switch the support point of the hydraulic lifting system (5) so that it is detached from the upper support unit (1) and supports the lower support unit (1). S15. Raise the hydraulic lifting system (5) and raise the support unit (1) below to the preset installation height H, and install the next support unit (1). Repeat S12 to S14 until the required height for the project is reached. S16. After installing the adjustable base (4) at the bottom of the support unit (1) at the bottom, remove the hydraulic lifting system (5).

2. The installation method of the tower support frame according to claim 1, characterized in that, The pin assembly (2) includes a positioning tube (21) and two pins (22). Two adjacent support units (1) are respectively inserted into the two ends of the positioning tube (21). The two pins (22) are respectively located at the two ends of the positioning tube (21). The pins (22) pass through the positioning tube (21) and are inserted into the support units (1).

3. The installation method of the tower support frame according to claim 2, characterized in that, The pin assembly (2) also includes an anti-disengagement buckle (23), which is connected in series at both ends of the pin (22).

4. The installation method of the tower support frame according to claim 1, characterized in that, The support unit (1) includes two symmetrically arranged support frame assemblies (11), a connecting frame (12), and a tie rod (13). The two support frame assemblies (11) are connected by the connecting frame (12) and the tie rod (13), respectively. The installation method of the support frame assembly (11) specifically includes the following steps: S21. Place the two support frame assemblies (11) symmetrically and the connecting frame (12) horizontally, so that the two ends of the connecting frame (12) are connected to the upper part of the two support frame assemblies (11) respectively. S22. The diagonal brace (13) is placed at an angle, with one end of the diagonal brace (13) connected to the upper part of one of the support frame assemblies (11) and the other end of the diagonal brace (13) connected to the lower part of another support frame assembly (11).

5. The installation method of the tower support frame according to claim 4, characterized in that, The support frame assembly (11) includes two symmetrically arranged uprights (111) and several horizontal bars (112) arranged sequentially from top to bottom. The two ends of the horizontal bars (112) are respectively connected to the two uprights (111). When the hydraulic lifting system (5) is used to support the support unit (1) in steps S12 and S14, the force is applied to the top horizontal bar (112).

6. The installation method of the tower support frame according to claim 4, characterized in that, In step S13, the support frame assemblies (11) of two adjacent support units (1) are vertically arranged.

7. The installation method of the tower support frame according to claim 1, characterized in that, The adjustable support (3) includes a top plate (31), a top rod (32), and a first locking nut (33) arranged in sequence. The top plate (31) is installed on the top of the top rod (32). The top rod (32) is inserted into the support unit (1). The first locking nut (33) is threadedly connected to the top rod (32) and abuts against the support unit (1).

8. The installation method of the tower support frame according to claim 7, characterized in that, The top plate (31) is provided with limiting posts (311) at the four corners, and the four limiting posts (311) and the top plate (31) form a U-shaped structure.

9. The installation method of the tower support frame according to claim 1, characterized in that, The adjustable base (4) includes a second locking nut (41), a base column (42), and a base plate (43) arranged in sequence. The base plate (43) is installed at the bottom of the base column (42). The base column (42) is inserted into the support unit (1). The second locking nut (41) is threadedly connected to the base column (42) and abuts against the support unit (1).

10. A method for disassembling a tower support frame, characterized in that, Specifically, the following steps are included: S31. Move the hydraulic lifting system (5) to the tower support frame and use the hydraulic lifting system (5) to support the support unit (1) at the bottom. S32. Raise the hydraulic lifting system (5) and move the adjustable base (4) off the ground; S33, Remove the adjustable base (4); S34. Lower the hydraulic lifting system (5) so that the support unit (1) near the ground is lowered to contact the ground and the support point of the hydraulic lifting system (5) is replaced on the support unit (1) of the upper layer. S35. Raise the hydraulic lifting system (5) and move the bottom support unit (1) off the ground; S36. Remove the bottom support unit (1); S37. Repeat steps S34 to S36 until all support units (1) are removed.

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