Method for setting up or dismantling in particular a supporting framework structure for a heavy load

Abstract

The invention relates to a method for setting up or dismantling in particular a supporting framework (10) for a heavy load, in which, during dismantling, a lifting system is first mounted at the top of the supporting framework (10) and with said lifting system, at least one crane (25) is lifted from the ground region up to the top of the supporting framework (10) and is pushed onto the flat support at the top end of the supporting framework. Then, a first lifting system is mounted by the crane (25) at the top of the supporting framework (10) and is connected to the support to hold the latter in a lowerable manner. The support is then separated from this surrounding supporting framework (10) and is lowered by the first lifting system, together with the at least one crane thereon, step by step within the supporting framework. In particular support structures can thus be dismantled in a simple manner and disposed of in an environmentally compliant manner and, vice versa, built with the same method.

Description

[0001]

[0002] Procedure for the construction or dismantling of, in particular, a

[0003] Support scaffolding for a heavy load

[0004] The invention relates to a method for erecting or dismantling, in particular, a supporting scaffold for a heavy load according to the preamble of claim 1 or claim 4.

[0005] Such support structures for heavy loads can be dimensioned with external dimensions in length and width between 25 and 35 meters and a height between 100 and 200 meters. They are used, for example, in coal-fired power plants to support boilers as heavy loads. These boilers, with a total weight of up to over 10,000 tons, primarily generate steam to drive the power plant's turbines. These boilers are suspended on anchor rods at a height of up to 150 meters above ground, depending on the type of power plant.

[0006] For well-known environmental reasons, efforts are underway to eliminate such power plants with high CO2 emissions and dismantle them accordingly. These boilers and the supporting structures supporting them are being dismantled in stages. This dismantling will involve either blasting or, if this is not possible for safety reasons, large cranes.

[0007] Large cranes are used both for dismantling and erecting such support scaffolding, but these are only available in limited quantities and can therefore lead to undesirable delays during erection or dismantling. In addition to the fact that the use of such large cranes is very cost-intensive and requires a lot of space, and erection is often very complex.

[0008] The invention is therefore based on the object of developing a method for erecting or dismantling support structures and also such boilers, by means of which support structures, in particular, can be erected or dismantled in a simple and cost-effective manner and disposed of in an environmentally friendly manner. This object is achieved according to the invention by the features of claim 1 with the method for erection, claim 4 with the method for dismantling, and claim 11 with a system.

[0009] The method according to the invention is characterized in that both the erection and dismantling of a supporting scaffold is possible in the same way, but in reverse order.

[0010] During assembly, the lowest level of the support structure is erected around the support by at least one crane on the ground area and a first lifting system is mounted by the crane on top of the erected lowest level of the support structure and connected to the support to hold the latter in a liftable manner.

[0011] The support, together with the at least one crane, is then lifted within this installed level of the shoring by the installed first lifting system, and the second-to-lowest level of the shoring is erected onto the installed level by the at least one crane. This is followed by a second lifting system, which is mounted by the crane on top of the erected second level of the shoring and connected to the support to hold the latter in a liftable manner. The first lifting system is then uninstalled from the lowest level, and the support, with the crane on it, is lifted one level higher by the second lifting system. This process is repeated with the individual levels being mounted one above the other until, preferably, the entire shoring is constructed.First, a lifting system, preferably a strand lifting system, is mounted on top of the support structure, and with it the at least one crane is lifted from the ground level to the top of the support structure and moved onto the flat support at the upper end of the support structure. Then a first lifting system, preferably a strand lifting system, is mounted by the crane on top of the support structure and connected to the support to lower the latter. The support is then separated from the surrounding support structure and gradually lowered within the support structure by the first lifting system, together with the at least one crane on it. Instead of a strand lifting system, the lifting system can be a known climbing crane, by means of which the individual components of the lifting system for lifting the crane are transported to the top of the support structure.

[0012] With this innovative approach to dismantling, for example, a mobile crane of average size can be used, a large number of which are available at any time and which are also cost-effective to use.

[0013] After lowering the support and the crane into the shoring, a second lifting system is mounted on top of the subsequent lower second stage of the shoring and connected to the support for lowering the latter. This allows the first lifting system and the first stage of the shoring above the support to be dismantled or removed by the crane. In the next step, a third lifting system is mounted on top of the subsequent lower third stage of the shoring and connected to the support for lowering the latter. The second lifting system and the second stage of the shoring can be dismantled by the crane in the same way. This process, involving the dismantling of the individual stages of the shoring, is then repeated until the entire shoring is dismantled.

[0014] With this very efficient dismantling according to the step-by-step process explained above, in which the individual stages of the support structure are dismantled into many individual parts of suitable lengths for transport, work can be carried out using existing resources.

[0015] With the method of dismantling according to the invention, supporting scaffolds with the massive support pillars, cross supports and frames can be dismantled and dismantled step by step without the need for blasting or the use of large cranes, which would have to have a total height greater than the supporting scaffold before dismantling.

[0016] In a very advantageous design, the lifting system by means of which the crane is lifted from the ground area to the upper end of the supporting structure is used as a lifting system for the subsequent lowering of the support.

[0017] It is advantageous to assemble and disassemble these lifting systems, which are both connected to the support after lowering the latter, alternately, reassembling them two steps lower after disassembly. This allows the gradual lowering of the support and, with it, the crane, to be achieved easily using just two lifting systems.

[0018] The lifting systems are conveniently mounted on top in the corners of the steps, which are rectangular in cross-section and are arranged one above the other, and their movable tension elements are releasably attached to the support on the inside of the supporting structure so that the latter can be lowered one step at a time in a controlled manner.

[0019] The invention and further advantages thereof are explained in more detail below using exemplary embodiments with reference to the drawing. It shows:

[0020] Fig. 1 is a perspective schematic side view of a supporting structure of a plant according to the invention with an external lifting system and a crane before lifting;

[0021] Fig. 2 is a perspective schematic partial side view of the supporting scaffolding according to Fig. 1 with the support and the crane standing thereon as well as a lifting system;

[0022] Fig. 3 is a perspective partial side view of the supporting scaffolding according to Fig. 2 with lowered support and the crane standing on it as well as two lifting systems mounted on top of the two steps shown;

[0023] Fig. 4 is a partial perspective side view of the scaffolding according to Fig. 3, with the top stage and the lifting system on it removed; Fig. 5 is a partial perspective view of the scaffolding according to Fig. 3 without the crane, showing the two mounted lifting systems on top of the two second and third stages shown; and

[0024] Fig. 6 a perspective side view of a lifting unit of the lifting system without support frame.

[0025] Fig. 1 to Fig. 5 show a schematic representation of a support scaffold 10 for at least one heavy load, which is mounted inside the support scaffold 10 but is not shown in more detail. This support scaffold 10 is composed of several steps 15.1, 15.2, 15.3 to 15.n, which are rectangular in cross-section and of the same design on the outside of the top and bottom steps. There are vertical support pillars 12 in the four corners, horizontal frames 13, 16 connecting these at the respective steps and two cross supports 17, 18 forming a triangle on each side, each of which consists of a frame profile. In Fig. 1, only 4 steps are shown, but usually there are more of these steps.

[0026] This support structure 10 can be configured differently depending on the circumstances and requirements, and can be placed freestanding in a factory area or designed as part of a building with a varying number of steps. On the uppermost step 15.1, a support 11 is attached to the surrounding frame 13, which is usually formed as a grid. The support structure 10 can also be designed differently than shown, having a cross-sectional shape other than rectangular or square and being equipped with different tension elements. As mentioned, such support structures 10 are used for supporting heavy loads, such as boilers in coal-fired power plants, and can have external dimensions in length and width between 25 and 35 meters and in height between 100 and 200 meters.Such a boiler can have a total weight of up to over 10,000 tons. It primarily generates steam to drive turbines in the power plant. It hangs on anchor rods at a height of up to 150 meters above ground, depending on the type of power plant. During the dismantling of the plant, the boiler is the first to be dismantled. This is also done using a lifting system, preferably with several lifting units, which is not explained in detail.

[0027] According to the invention, for the dismantling of the support scaffold 10, a lifting system 20 is first mounted on the top of the support scaffold 10 on laterally projecting beams 14, and with it, the at least one crane 25 is lifted from the floor area 19 to the top of the support scaffold 10 and adjusted to the operating position on the support 11. The lifting system 20 consists of four lifting units 21, which are arranged above the beams 14 in such a way that they can be fastened to a platform 26 with their vertically extending tension elements 22 and raise the platform to such a height that their upper standing surface can be positioned flush with that of the support 11.

[0028] A mobile crane is used as the crane 25, which can be moved onto this platform 26 and which is lifted together by means of the lifting system 20 from the outside from the floor area 19 to the top of the support structure 10, and the crane 25 can be moved from the platform 26 to the support 11. The crane 25 has a crawler vehicle 27 and a telescopically retractable and extendable boom 29 hinged to the crawler vehicle 27, with at least one supporting cable and a crane hook 29'. In principle, a stationary or adjustable crane with a vertical lattice boom and at least one transverse lattice boom, or something similar, could also be used. Two or more cranes 25 of the same or different sizes could also be placed on the support 11 and could operate simultaneously.

[0029] As a special feature, at least one or more supporting cables are provided with the crane hook 29' at the front end with a length such that they can lower the parts 31 dismantled during dismantling from the uppermost step 15.1 down to the floor area 19 outside the supporting structure 10.

[0030] This lifting system 20 for raising the crane 25 can subsequently be dismantled and mounted as the first or second lifting system on top of the first or second stage 15.1, 15.2 and connected to the support 11 for lowering the latter. However, it can also be dismantled from the crane 25 together with the beams 14 and lowered back into the floor area 19.

[0031] According to the invention, in a next step, this lifting system 20.1 is preferably mounted by crane 25 on top of the uppermost step 15.1 of the supporting structure 10 and connected to the support 11 for lowering the latter. For this purpose, the lifting system 20.1, consisting of four lifting units 21, is mounted above the horizontal frame 13 according to Fig. 2 in such a way that they can be fastened to the outside of the support 11 with their vertically extending tension elements 22, with a gap being present between the inside of the supporting structure 10 and the outside of the support 11, at least in these corners.

[0032] According to Fig. 3, in a further step, the support 11, now held by the lifting system 20.1, is separated from the surrounding supporting structure 10 at the connection points. This lifting system 20.1, together with the crane 25, lowers it within the supporting structure 10 around the first stage 15.1 until it reaches below the upper frame 16 of the second stage 15.2. The connection points between the support 11 and the frame 13 of the supporting structure 10 in the operating state are not illustrated in detail.

[0033] Subsequently, a second lifting system 20.2 is mounted on top of the subsequent lower second stage 15.2 of the supporting structure 10 and connected to the support 11 for lowerable support of the latter, so that the support 11 and the crane 25 located on it are held by the latter. The first lifting system 20.1 is dismantled, and the first stage 15.1 of the supporting structure 10 above the support 11 is dismantled by the crane by holding it and lowering the disassembled parts 31 down to the floor area 19, as shown in Fig. 4.

[0034] These disassembled parts 31, which are advantageously dismantled piece by piece from the support pillars 12, the horizontal frame 13 and the cross supports 17, 18, are advantageously provided with such a length during separation that they can be removed in a manner suitable for transport. This metal-assembled support structure 10 can be used for

[0035] For example, these parts 31 can be cut by welding.

[0036] Once this first stage 15.1 is removed, the support 11 is lowered by the second lifting system 20.2 into the third stage 15.3, as shown in Fig. 5. A lifting system 20.1 is mounted on the upper frame 16' at the subsequent lower third stage 15.3 of the supporting structure 10 and connected to the support 11 to lowerably support the latter. The second lifting system 20.2 is then dismantled, and the second stage 15.2 of the supporting structure 10 is disassembled into these parts 31 and removed by the crane 25.

[0037] This process of dismantling the individual stages 15.1 to 15n of the supporting scaffolding with the respective step-by-step lowering of the support 11 is repeated preferably until the entire dismantling of the same.

[0038] It is very advantageous to use the first lifting system 20.1 on top of the first stage 15.1 after dismantling it as the third lifting system 20.1 on top of the third stage 15.3 and connect it to the support 11 held by the second lifting system to lower the latter. The two lifting systems 20.1 and 20.2 can thus be alternately assembled and disassembled. However, it is not excluded that more than two lifting systems may be used.

[0039] Fig. 5 shows the largely dismantled first stage 15.1, as well as the second and partially the third stage 15.2, 15.3 prior to dismantling. The four lifting units 21 of the respective lifting systems 20.1, 20.2 are mounted above the frames 16, 16' in the corners of the rectangular stages 15.2, 15.3. They each consist of a support element 23 arranged in the corner area of ​​the respective frame 16, 16', a hydraulic piston-cylinder unit 30 fixed to the latter, and the tension elements 22, 22' guided by the support element. The four support elements 23 are each arranged transversely in the corners 36 of the frame 16, 16' such that the tension element 22 extends vertically inside the supporting structure 10 and can be fastened at the lower end to a holding element 11' in the corner of the rectangular support 11. There are two tension elements 22 in each third stage 15.3 are arranged in pairs next to one another and fastened to one holding element 11', wherein the tension element 22 of the upper lifting unit 21 is fastened to the holding element 11' offset inwards so that it runs at an inward distance from the support element 23' of the lower lifting unit 21. In this shown position of the support 11, the upper lifting system 20.2 can then be dismantled, so that the support is only held by the lower lifting system 20.1.

[0040] Essentially, these lifting units 21, which are known per se and not shown in detail, consist as strand lifting systems according to Fig. 6 each of this hydraulic piston-cylinder unit 30, which is fixed on the support element 23 provided with flanges 33 and has a central through-opening inside for receiving one or more tension elements 22, preferably made as strands. The cylinder is provided with an annular chamber in which the sleeve-shaped piston is guided in the axial direction. At the upper end of the piston and at the lower end of the cylinder, respectively, a clamping device with radially adjustable clamps is provided for holding the tension element(s) 22. When the latter and thus the support 11 are lowered, the clamps of the upwardly extended piston hold the tension element 22 firmly and the piston is retracted downwards into the cylinder in a controlled manner.The open clamps on the cylinder are then closed and those on the piston are opened. The piston is then extended upward again, its clamps are closed, and those on the cylinder are opened, so that the piston, together with the tension element 22, is moved downwards in a controlled manner. This process is repeated until, in particular, support 11 has reached the correspondingly lowered position. The control of the four piston-cylinder units 30 is synchronized, which can be achieved by pressure regulation to achieve even load distribution so that support 11 is always lowered in a horizontal position. In principle, however, parallel lowering can also be carried out using different pressures in the piston-cylinder units.

[0041] The method according to the invention further provides that it can also be used to erect a support scaffold 10 in the same way, in which case this takes place in the reverse order to the dismantling. This method sequence is not illustrated in detail; it consists of the following essential steps. For clarity, the reference numerals for the essentially identical components are given: a. The at least one crane 25 is placed in the operating position on a flat support 11 in the floor area 19. b. The preferably lowest step 15.n of the support scaffold 10 is then erected around the support 11 by the at least one crane 25 on the floor area 19 and a first lifting system 20.1, preferably a strand lifting system, is mounted by the crane 25 on top of the erected, preferably lowest step 15.n of the support scaffold 10 and connected to the support 11 to hold the latter in a liftable manner, as explained above.In principle, this lowest step could also be installed by a different crane, with crane 25 only being used from the second or third step onwards. c. The support 11 is then lifted together with the at least one crane 25 by the installed first lifting system 20.1 within this installed step 15.n of the support scaffolding. d. Leaving the first lifting system 20.1 in the installed state on the lowest step 15.n, the second lowest step of the support scaffolding is lifted onto the lowest step by the at least one crane 25, and a second lifting system 20.2, preferably a strand lifting system, is mounted by the crane on top of the erected second lowest step of the support scaffolding 10 and connected to the support 11 to hold the latter in a liftable manner. e. The first lifting system 20.1 on the lowest level 15.n is uninstalled by at least one crane, and the support 11, together with the crane on it, is lifted by the installed level. f.This process, involving the assembly of the individual steps 15n to 15.1 one above the other and the assembly and disassembly of the lifting systems 20.1, 20.2, is repeated until the entire support structure 10 is erected. g. After the assembly of the uppermost step 15.1 of the support structure 10 and a lifting system 20.1 on it, the support 11 and with it the at least one crane 25 are lifted up to the top of this step and secured in the support structure 11, as shown in Fig.

[0042] 2. h. A lifting system 20, preferably a strand lifting system, is mounted on the top of the supporting structure 10, and with it, at least one crane 25 is lowered from the top of the supporting structure down to the ground level, as illustrated in Fig. 1. The lifting system 20 is mounted laterally on the supporting structure so that this platform 26 is lifted by it, and the crane 25 is positioned on it and lowered down to the bottom.

[0043] With this inventive construction of a support scaffold for supporting a heavy load in the range of several thousand tons, efficient and cost-effective assembly can also be achieved using simple means. It would be possible for the lowest and possibly the second stage to be assembled manually using a crane, and then for the second or third stage to be assembled using the method according to features a. and b.

[0044] The invention could be explained by other variants. For example, auxiliary devices could be used for assembling the beams 14 and the lifting system 20 prior to dismantling, which could be lifted and installed using temporarily deployable cable winches or other lifting devices. The support 11, usually designed as a grid on the top of the supporting scaffold, can be provided with base plates that could also be mounted using these lifting devices. As a variant, the lifting system could be equipped with a different number of lifting units 21 and tension elements 22 than those shown, for example, with only two lifting units. The steps are each provided with an upper frame on which these lifting units are placed. However, they could also be constructed without a frame, and the lifting units 21 could then be attached to a respective support pillar or to another supporting element of the supporting scaffold.

[0045] Hoisting systems could include pulleys, powered pulleys, climbing cranes and / or similar.

[0046] The crane could also be lifted without platform 26 and be equipped with additional hoist winches to enable the required lifting length of the supporting rope(s).

[0047] Instead of a supporting scaffold, a building could also be dismantled or rebuilt using facade elements, lattice masts for high-voltage electrical lines or the like.

[0048] In principle, the supporting pillars 12 to be assembled, the frames, and the cross supports of the supporting scaffolding could not be lifted by the crane 25 from the ground level to the respective uppermost level during assembly, or conversely, lowered by this crane from the uppermost level to the ground level. Instead, a lifting system similar to the lifting system 20 shown in Fig. 1, which is also movable on the supporting scaffolding, could be used, by which the parts could be lifted while the crane 25 removes them from the lifting system for assembly. Conversely, during dismantling, the parts would be placed by the crane onto the lifting system and lowered by it to the ground level. Such a lifting system could be designed like an elevator with deflection pulleys for the cable pull.

Claims

PATENT CLAIMS 1. Method for erecting, in particular, a support scaffold for a heavy load, in which a support scaffold (10) having a flat support (11) is built step by step by at least one crane (25), characterized in that the support scaffold (10) is erected by the following steps: a. that preferably the lowest level of the support scaffold is erected around the support (11) by the at least one crane (25) on the floor area (19) and a first lifting system, preferably a strand lifting system, is mounted by the crane (25) on top of the erected, preferably lowest level of the support scaffold and is connected to the support to hold the latter in a liftable manner, b. that the support is lifted together with the at least one crane (25) by the mounted first lifting system within this mounted level of the support scaffold; c.that the next step of the support structure is lifted onto the mounted step by said at least one crane (25) and a second lifting system, preferably a strand lifting system, is installed on top of the mounted step of the support structure and is connected to the support (11) for holding the latter in a liftable manner, d. the first lifting system is uninstalled on the lowest step by said at least one crane (25) and the support (11) with the crane (25) on it is lifted up one step. e. and that this process is repeated with the assembly of the individual stages one above the other until, preferably, the entire structure of the supporting structure (10) of the same.

2. Method according to claim 1, characterized in that the support (11) and with it the at least one crane (25) are lifted up to the top of this step after the assembly of the uppermost step of the supporting structure (10) and a lifting system thereon and the support (11) is fastened in the supporting structure (10).

3. Method according to claim 1 or 2, characterized in that a lifting system, preferably a strand lifting system, is mounted on the top of the supporting structure (10) and with it the at least one crane (25) is lowered from the top of the supporting structure down to the ground area.

4. Method for dismantling, in particular, a support scaffold for a heavy load, in which the support scaffold (10), which is provided with a flat support (11) on the upper side, is dismantled step by step by at least one crane (25), characterized in that the support scaffold (10) is dismantled by the following steps: a. that a lifting system (20), preferably a strand lifting system, is mounted on the upper side of the support scaffold (10) and with it the at least one crane (25) is lifted from the floor area (19) to the upper side of the support scaffold (10) and moved onto the flat support (11) into the operating position; b. that a first lifting system (20.1), preferably a strand lifting system, is mounted by the crane (25) on top of the uppermost step (15.1) of the supporting structure (10) and connected to the support (11) for lowerably holding the latter; c. that the support (11) is separated from the supporting structure (10) surrounding it and is lowered by the first lifting system (20.1) together with the at least one crane within the supporting structure (10) around the first step (15.1); d. that a second lifting system (20.2) is mounted on top of the subsequent lower second step (15.2) of the supporting structure (10) and connected to the support (11) for lowerably holding the latter; e. that the first lifting system (20.1) and the first step (15.1) of the supporting structure (10) above the support (11) are dismantled by the crane (25), f. that the support (11) is lowered by the second lifting system (20.2) together with the at least one crane within the supporting structure by the second step (15.2); g.that a lifting system (20.1) is mounted on top of the subsequent lower third step (15.3) of the supporting structure (20.2) and is connected to the support (11) for lowerably holding the latter, h. that the second lifting system (20.2) and the second step (15.2) of the supporting structure (10) are dismantled by the crane (25), i. that this process is repeated with the dismantling of the individual steps (15.1 to 15.n) of the supporting structure (10) until preferably the entire dismantling of the same.

5. Method according to claim 4, characterized in that the crane (25) is brought onto a platform (26) for its lifting and these are lifted together by means of the lifting system (20) from the floor area (19) to the upper side on the outside of the supporting structure (10) in such a way that the crane (25) can be moved from the platform (26) onto the support (11).

6. Method according to claim 4 or 5, characterized in that the lifting system (20) for lifting the crane (25) is preferably subsequently dismantled and mounted as a first or second lifting system (20.1, 20.2) on top of the first or second stage (15.1 to 15.2) and connected to the support (11) for lowerably holding the latter.

7. Method according to claim 6, characterized in that this is dismantled as a first lifting system (20.1) on top of the first stage (15.1) before dismantling the first stage (15.1) and is mounted as a lifting system (20.1) on top of the third stage (15.3) and is connected to the support (11) held by the second lifting system (20.2) for lowerably holding the latter.

8. Method according to one of claims 4 to 7, characterized in that two lifting systems (20.1, 20.2) are alternately assembled and disassembled, wherein after disassembly they are each reassembled two steps lower.

9. Method according to one of claims 4 to 8, characterized in that the lifting units (21) of a respective lifting system (20.1, 20.2) are mounted on the top in a corner (36) of a frame (13, 16, 16') of a step (15.1) in such a way that the tension elements (22) of the lifting units (21) each run vertically on the inside of the supporting structure (10) and can be fastened at the lower end to a holding element (1 T) in a corner of the rectangular support (11).

10. Method according to one of claims 4 to 9, characterized in that the individual stages (15.1 to 15.n) of the supporting structure (10) are composed of vertical support pillars (12), an upper horizontal frame (13, 16, 16') and transverse cross supports (17, 18) connecting the frames, which are individually released during dismantling and transported by the crane (25) outside the supporting structure (10) down to the ground area (19).

11. Plant with a supporting structure (10) and at least one heavy load held therein, the plant being constructed according to the method of claims 1 to 3 or being dismantled according to the method of claims 4 to 10, the supporting structure (10) being provided with a number of stages (15.1 to 15.n) and the heavy load being mounted therein, characterized in that the supporting structure (10) is dimensioned with external dimensions, preferably in length and width in cross-section, of between 25 and 35 meters and a height of between 100 and 200 meters and in this is designed to carry at least one heavy-duty container with a total weight of, in particular, more than 10,000 tonnes.

12. Plant according to claim 11, characterized in that the heavy-duty container in the supporting structure (10) is provided as a boiler for the generation of steam in a coal-fired power plant, which is the first to be dismantled during the dismantling of the plant.

13. Installation according to claim 11 or 12, characterized in that the lifting units (21) of a respective lifting system (20.1, 20.2) are mounted on the top in a corner (36) of a frame (13, 16, 16') of a step (15.1) in such a way that the tension elements (22) of the lifting units (21) each run vertically on the inside of the supporting structure (10) and can be fastened at the lower end to a holding element (11') in a corner of the rectangular support (11).

14. Crane for carrying out the erection or dismantling, in particular of a supporting scaffold (10) according to the method of claims 1 to 3 according to the method of claims 4 to 10, which is a mobile crane with a crane vehicle and a telescopically retractable and extendable boom hinged thereto or a crane with a vertical lattice mast and at least one lattice mast placed transversely thereon, wherein the crane (25) has at least one or more supporting cables with a crane hook (29') or the like, characterized in that the at least one or more supporting cables are provided with the crane hook (29') or the like at the front end with such a length- are such that they can lower the parts (31) dismantled during dismantling from the top step (15.1) down to the floor area (19) or that when erecting a supporting scaffold (10) they can lift parts from the floor area (19) outside the supporting scaffold (10) up to the top step (15.1) of the steps to be assembled.

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