Platform for an elevator system for a building which is under construction

Abstract

The invention relates to an elevator system (1) for a building which is under construction, the elevator system comprising an elevator shaft (2) which becomes taller as the building height increases over the course of the construction phase of the building. The elevator system comprises a platform (7) which is installed in the elevator shaft (2) and can be adapted to the increasing height of the building. The platform (7) is supported on supporting brackets (8) which are arranged in the elevator shaft (2), the supporting brackets being fixed on a shaft wall (6) of the elevator shaft (2) by means of anchor bolts (13). Fastening brackets (9) are also arranged in the elevator shaft (2), the fastening brackets also being fixed on the shaft wall (6) by means of anchor bolts. The platform (7) comprises retaining devices (12) which are pivotably attached to the platform (7) and which are connected to the fastening brackets (9) in order to secure the platform.

Description

[0001] Platform for an elevator system for a building under construction

[0002] The invention relates to a platform for an elevator system with an elevator shaft that increases in height during the construction phase of the building, and to such an elevator system. This elevator system can be used in particular on construction sites for high-rise buildings.

[0003] During the construction of the building, the lower floors constructed first may already be sufficiently finished to be habitable or usable for another purpose. For this purpose, the elevator system comprises an elevator car which can be used to access the floors already used as residential or commercial space during the construction phase of the building. The construction phase elevator with this elevator car grows with the building to a certain extent, i.e. the usable lifting height of the construction elevator increases with the increasing height of the building or the elevator shaft. This means that during the construction period, construction workers and building materials or, if applicable, users of apartments or commercial premises already occupied before the building is completed can be transported in the elevator car. Such an elevator system is known from US 2016 / 0152442 A1.The elevator system has a machine platform that can be moved along the elevator shaft and from which the elevator car is suspended via support means arranged in the elevator shaft. The machine platform is raised on a rotating basis to increase the usable lifting height of the elevator car in the elevator shaft. To raise the machine platform, a platform that can be moved along the elevator shaft is provided to form a support structure that can be supported on the wall of the elevator shaft. This support structure, arranged above the machine platform, is raised by a first lifting device mounted in the upper area of ​​the elevator shaft to a height at which the platform supported by this support structure can be raised a certain distance. A second lifting device, arranged on the aforementioned support structure, is used to raise the machine platform.With the above-mentioned state of the art, the elevator car from the construction phase can continue to be used for normal use of the building after completion of the building.

[0004] Elevator shafts in buildings can be constructed using climbing formwork. Climbing formwork is a discontinuous formwork system and is used for the construction of tower-like structures. It can be used to create concrete sections for the elevator shaft floor by floor. It is common practice to create pocket-like recesses when creating the concrete sections. Extendable support elements of the machine platform or support elements of other platforms engage in these recesses in the shaft wall, thus enabling the respective platform to be positioned in a fixed location. This is demonstrated, for example, in WO2022 / 069316 A1. However, practice has shown that, for example, when using climbing formwork, such recesses are often not created in the shaft wall, or that recesses are in the wrong positions.

[0005] It is an object of the present invention to overcome the disadvantages of the known system and, in particular, to create an elevator system of the type mentioned above that can be installed easily yet safely in an elevator shaft. The elevator system should comprise a platform that can be reliably and safely positioned in the elevator shaft, even without special structural measures.

[0006] According to the invention, these and other objects are achieved with a platform having the features of claim 1. The elevator system for a building under construction with an elevator shaft that becomes higher as the building's height increases during the construction phase of the building comprises a platform installed in the elevator shaft that is adapted or adaptable to the increasing building height. The elevator system can have one or more such platforms. For example, the platform can be a so-called machine platform, i.e. a platform with an elevator drive with which an elevator car suspended from the machine platform via support means can be driven. The machine platform can be raised in the elevator shaft by means of a lifting device and thus adapted to the increasing building height. The platform can have support means for support in the elevator shaft, for example telescopically extendable and retractable support means or pivoting support means.In this document, the term "elevator shaft" is understood to mean a space in a building under construction, the height of which increases in line with the progress of construction, wherein the space is dimensioned and designed such that at least one elevator car of an elevator, usually one elevator car and one counterweight of each elevator, can move upwards and downwards along vertical travel paths. Such an elevator shaft can be a single shaft enclosed by shaft walls. However, the elevator shaft can also be part of a contiguous space, in which part the travel paths of the elevator car and, if applicable, the counterweight of one of the at least two elevators arranged parallel to each other are arranged. There is no shaft wall between the travel paths of adjacent elevators, but there are usually steel girders for fastening elevator components.Because at least one support bracket is arranged in the elevator shaft, which is fixed to a shaft wall of the elevator shaft by means of anchor screws, bolts or other fastening means, on which support bracket the platform is supported, and because a securing element is arranged to specify a shaft-side fixed point, which is fixed to a shaft wall of the elevator shaft by means of anchor screws, bolts or other fastening means, wherein securing means are connected or connectable to the securing element to secure the platform, the platform can also be reliably and safely positioned in a fixed position in the elevator shaft, for example on a smooth shaft wall or elevator shafts that have not been specially prepared by structural measures during concrete formwork construction.The at least one support bracket can be arranged at least temporarily for the construction phase and in particular for a section of the construction phase that lies between two lifting operations for a rail installation phase. The at least one support bracket could, however, also be arranged permanently in the elevator shaft and does not have to be removed after the platform has been raised. The respective support bracket can preferably be a metallic support bracket to form a stable shaft abutment. The same can also apply to the at least one securing element. The securing element can also be arranged only temporarily or permanently in the elevator shaft. Securing means for securing the platform against falling are temporarily attached to this securing element or are connected or connectable to it in some other way. The securing means thus cooperate with the securing element to secure the platform against falling. The securing element, e.g.A hook, eyebolt, or bolt provides a fixed point on the shaft side to which a safety rope or chain, for example, can be attached as a safety device. As soon as the platform moves downward in an emergency situation (safety event), for example, if the support bracket fails, the safety rope or chain is deployed and prevents a fall.

[0007] Alternatively or in addition to the aforementioned machine platform, the elevator system can also have other platforms that are positioned and secured in the elevator shaft in the manner described above. The platform can, for example, be a lifting platform whose purpose is to move the machine platform upwards for a lifting operation. Such a lifting platform is known as an upper protective platform (crash deck). The platform can further comprise, for example, a protective roof. The platform can then contain a base component that forms a supporting structure, which base component is adapted to the shaft space and almost completely fills it in a plan view. This base component can be plate-like or have a plate. When the base component is installed or during the construction phase, it is preferably aligned horizontally.

[0008] According to a preferred embodiment, the securing element can be designed as a securing bracket. The securing bracket can be easily fixed to the shaft wall, meets even high safety requirements, and thus provides a convenient shaft-side fixing point for the securing devices.

[0009] Preferably, two support brackets and two securing brackets can be provided on each side to support and secure the platform. These components can particularly preferably be arranged in pairs in the elevator shaft, with each support bracket and securing bracket forming such a support and securing pair. Such an arrangement ensures a particularly stable and secure stationary positioning of the platform in the elevator shaft.

[0010] If the platform is preferably provided with telescopically extendable and retractable or pivoting support means, the support bracket has lateral brackets, particularly in the form of side plates, to secure the support means in position. A metal profile part, for example, can be used as the support means, which is slidably mounted in a horizontal beam so that it can be telescopically extended and retracted. Such brackets ensure that the platform remains stable in its fixed position. For a lifting operation, the support means can be retracted or pivoted in, allowing the platform to be moved upwards without disruption. After the lifting operation is complete, the support means can be extended or pivoted out again, and the platform can then be lowered over the support means onto the upper support bracket(s) to establish a new fixed position in the elevator shaft.

[0011] The support bracket can have a preferably plate-shaped fastening section that lies flat against the shaft wall or can be placed flat against it, and an abutment section that projects at right angles from the fastening section to define a support surface for the platform and, in particular, for the aforementioned support means. The fastening section and the abutment section can be metal parts, particularly made of steel. However, a one-piece design is also conceivable, in which the fastening section and the abutment section are molded together to form a monolithic body, for example, a cast metal body.

[0012] In a preferred embodiment of the elevator system, the safety element is designed as

[0013] The platform is designed with a safety console, and the platform has at least one holding device to form safety means, which can be brought into operative connection with the safety console or interacts with it to secure the platform. The safety console can form a stop for the holding device. If the platform moves or intends to move downwards during a securing event, a striking contact occurs between the holding device and the safety console, thus preventing a fall. If two safety consoles are provided on each side, two holding devices must be provided accordingly to secure the platform.

[0014] The holding device can be pivotally mounted on the platform. The pivoting design allows for easy release of the active connection during a lifting operation. The holding device can be pivoted back and forth between an active position (platform secured) and a second position in which the holding device is removed or separated from the securing console for the lifting operation to release the active connection.

[0015] The holding device can have an engagement opening which, in an active position, surrounds an abutment of the securing console, so that in the case of securing, the abutment forms a stop for the holding device to stop a further downward movement of the platform.

[0016] The holding device can comprise a holding arm and an adjoining holding section, wherein the holding device is pivotally mounted on the platform via a lower end of the holding arm, and wherein the holding section adjoins an upper end of the holding arm. This holding section is designed in a frame-like manner and forms the engagement opening. In its active position, the holding device can be held in the securing bracket in such a way that engagement is ensured via the engagement opening.

[0017] The holding device comprising the holding arm and holding section can be made of one or more metal plates.

[0018] To further increase safety, position securing means may be provided to hold the holding device in the securing console, thereby ensuring engagement and thus securing the holding device in the active position.

[0019] An advantageous elevator system is achieved when the support bracket is positioned below the platform and the safety element, especially the safety bracket, is positioned above the platform. This arrangement results in a particularly stable positioning while the safety device is easy to handle.

[0020] It is also advantageous if the support bracket(s) and securing bracket(s) are essentially similar and preferably identical in design. Reducing the number of different components results in advantages in terms of assembly and costs. The same component can be used either as a support bracket or as a securing bracket, which also offers logistical advantages.

[0021] A further aspect of the invention relates to a platform for an elevator system for a building under construction with an elevator shaft that becomes higher as the building height increases during the construction phase of the building, wherein a usable lifting height of the elevator system is adapted to the increasing building height using platforms, and in particular for the elevator system described above, wherein at least one of these platforms has support means that can be retracted and extended in a preferably telescopic manner or pivotable support means for supporting on at least one support console, and that the platform has a holding device that can be brought into operative connection with a securing console to secure the platform.

[0022] Finally, a further aspect of the invention relates to a method for erecting an elevator system for a building under construction with an elevator shaft that becomes higher as the building height increases during the construction phase of the building, wherein a usable lifting height of the elevator system is adapted to an increasing height of the building by carrying out at least one lifting process, in which lifting process, for example, a machine platform with an elevator drive and an elevator car suspended from the machine platform via support means are lifted in the elevator shaft by means of a lifting device.The method is characterized by the fact that, after a lifting operation, the machine platform is installed on at least one side against a smooth shaft wall of the elevator shaft. The machine platform is placed on at least one support bracket secured to the shaft wall by means of anchor screws, bolts, or other fastening means. At least one securing bracket is secured to the shaft wall by means of anchor screws, bolts, or other fastening means. The machine platform is secured by means of the at least one securing bracket. "Smooth" refers to an area of ​​the wall in which the platform is to be installed; the wall, of course, does not have to be completely smooth."Smooth" means that the wall has a more or less flat surface and, at least in the desired installation area for the platform, it has no indentations or notches in the wall into which support elements could be inserted, as is otherwise common in the state of the art. This method is particularly suitable for erecting the elevator system described above.

[0023] Further advantages and individual features are evident from the following description of exemplary embodiments and the drawings. They show:

[0024] Fig. 1 is a schematic representation of an elevator system for a building under construction with an elevator shaft that becomes higher as the building height increases during the construction phase of the building, in a side view, wherein the elevator system comprises a machine platform fixedly positioned in the elevator shaft,

[0025] Fig. 2 is an enlarged detailed view of the elevator system of Fig. 1 with the machine platform securely positioned in the elevator shaft by means of a support bracket and safety bracket,

[0026] Fig. 3 is a perspective view of a machine platform fixedly positioned in an elevator shaft for an elevator installation according to the invention,

[0027] Fig. 4 shows a support bracket or safety bracket for the elevator system according to Fig. 3 in an enlarged view, and

[0028] Fig. 5 shows a holding device for securing the machine platform of the elevator system according to Fig. 3.

[0029] Fig. 1 shows a schematic diagram of an elevator system 1 for a building under construction. The building comprises an elevator shaft 2, which becomes higher as the building increases in height during the construction phase. An elevator car 3 is installed in the elevator shaft 2. The elevator also has a counterweight and suspension elements 26. The elevator car 3 and a counterweight 4 are guided on guide rails (not shown here for simplicity) during vertical travel. A drive 5 (e.g. traction sheave drive) drives the respective suspension elements (e.g. one or more belts, steel cables) and thus moves the elevator car 2 and the counterweight 4 in opposite directions. The elevator car 3 enables the transport of people and goods to and from the lower floors even during the construction phase of the building. In particular, the elevator car can be used to transport construction workers and building materials.However, users of apartments or business premises already occupied before the building was completed can also be transported between at least the floors assigned to these rooms in accordance with the regulations.

[0030] The elevator system 1 has a machine platform 7 with the aforementioned drive 5, from which the elevator car 3 is suspended via the support means 26. The machine platform 7 can be displaced upwards along the elevator shaft 2 during the construction phase. In Fig. 1, the machine platform 7 is fixedly positioned in the elevator shaft 2 in a manner explained in detail below. However, the fixed positioning is only temporary; the elevator system grows discontinuously. The fixed positioning must be removed so that a lifting process can be carried out. During the lifting process, the machine platform 7 is raised to the next higher level in the elevator shaft 2.

[0031] Above the machine platform 7, the elevator system 1 has an arrangement (not shown here) for equipping the upwardly growing elevator shaft 2, in particular with guide rails for the guide rail strand. In addition to the machine platform 7, this arrangement also comprises further platforms, such as an upper protective platform (not shown), over or by means of which the machine platform 7 can be lifted in the elevator shaft 2. A lifting device, indicated by 28 and assigned to the upper protective platform, can be used for lifting. The upper protective platform also serves to support an assembly platform (also not shown). The assembly platform is the platform from which the guide rail strand(s) are extended upwards. The assembly platform serves as a working platform for assembly personnel.The upper protective platform also has the task of protecting people and equipment in the elevator shaft 2—particularly in the aforementioned assembly platform—from objects that may fall during construction work on the building. The rail assembly phase can be followed by a growth phase. After the rail assembly phase is completed and the elevator shaft 2 has become sufficiently higher as construction of the building progresses, the platforms must be positioned at the next higher level. After the upper protective platform has been temporarily re-secured in the elevator shaft 2, the machine platform 7 can be raised to the next higher level. In the present embodiment, the machine platform 7 has a connection point, for example in the form of an eyelet 23, for attaching a chain hoist, for example.The chain hoist is designed to allow the machine platform 7, preferably together with the attached elevator car 3 (and the counterweight), to be moved upwards for a lifting operation. However, the machine platform 7 could also be moved to the upper operating position using other lifting equipment, such as a crane, traction winch, hydraulic jack, or strand jack.

[0032] As can be seen from Fig. 1, the machine platform 7 is supported on one side on a support bracket designated 8. The shaft openings are located on the opposite side. On this side, the machine platform 7 is supported on the floor, with a movable support means 25 in the form of a profile part being provided to provide support. This support means 25 can be moved or removed if necessary, so that the machine platform 7 can be lifted upwards without obstructions. A support bracket 7 is fixed to a shaft wall 6 of the elevator shaft 2 by means of anchor screws 13, bolts, or other fastening means. A second bracket is located above it. This bracket, designated 9, serves to secure the machine platform 7 and is therefore referred to below as the securing bracket.The securing bracket 9 provides a fixed point on the shaft side, with which a holding device 12 pivotally attached to the platform 7 interacts.

[0033] Details of the aforementioned holding device 12 can be seen in Fig. 2. The holding device 12 has a hook-like engagement structure which, in the event of a safety incident as a result of the failure of the support bracket 8, comes to a stop on the securing bracket 9, thus stopping any undesired downward movement of the machine platform 7. Instead of a securing bracket 9, other securing elements such as hooks, eyebolts, or bolts inserted into the shaft wall 6 to provide a shaft-side fixed point could also be conceivable. Instead of a holding device 12, other securing means could also be used. For example, to secure the platform 7 from falling, a safety rope or chain could be temporarily connected to the aforementioned shaft-side fixed point.

[0034] Figures 3 to 5 relate to a further embodiment of an elevator system for a building under construction with an elevator shaft that becomes higher as the building's height increases during the construction phase, in which elevator system at least one platform is held and secured in the elevator shaft in a similar manner, wherein here too the platform is, by way of example, a machine platform 7, although the drive for moving the elevator car is not shown in the present case. The machine platform 7 has two horizontal main beams 10 running parallel to one another. The beams 10 are equipped at both ends with movable support means 11, 25. At the end facing the shaft wall, the machine platform 7 has telescopically extendable and retractable support means 11.These support means 11 are formed by profile parts which are displaceably mounted in the beams 10 designed as longitudinal beams, wherein the longitudinal beams 10 are designed as box profiles in the present embodiment.

[0035] In Fig. 3, the support means 11 are in the extended state. As can be seen, the respective profile part for forming the support means lies on the support bracket 8 and thus supports the platform. The support bracket 8 is fixed to the shaft wall 6 by means of anchor bolts 13. Above the support bracket 8 is the securing bracket 9, which is similarly fixed to the shaft wall 6 by means of anchor bolts 13. Furthermore, it can be seen from Fig. 3 that on the side facing the shaft wall 6, two support brackets 8, 8' and two securing brackets 9, 9' are provided for supporting and securing the machine platform 7, which are each combined in pairs.

[0036] In terms of their construction, the support brackets 8 and securing brackets 9 are identical in this case. For the sake of simplicity, the structure and design of the support bracket 8 are explained below. The statements regarding the support bracket 8 therefore also apply to the securing bracket 9. The support bracket 8 has a plate-shaped fastening section 17 that lies flat against the shaft wall 6 and an abutment section 18 that projects at right angles from the fastening section to define a support surface.

[0037] The machine platform 7 has support means arranged at the ends of the longitudinal beams 10, wherein the support means designated 25 are pivotally attached to the beam 10. The support means 25, which is pivotally attached to the beam about the pivot axis 43, can be pivoted into the vertical position shown in Fig. 3 and fixed in this position by means of a locking pin. The support means can be preloaded, for example, by means of springs, so that the support means 42 are pivoted into the horizontal position under spring action. The machine platform 7 is fixedly positioned in the elevator shaft at the front via pivoted-out support means 25, wherein to fix this position in the front area, the support means 25 can be firmly connected to the floor for the required duration using screws (not shown).Platforms could also be positioned in a fixed position using such pivoting support means with a smooth shaft wall, similar to the left side or rear side where - as already described - telescopically movable support means are used instead of pivoting support means.

[0038] Structural details regarding the design of the support bracket 8 (or the identical securing bracket 9) can be seen in Fig. 4. By using components made of metal plates, a cost-effective yet very stable support bracket 8 can be produced. In the fastening section 17 formed by a metal plate, a plurality of holes 22 are provided into which the anchor bolts can be passed. The abutment section 18, which projects at right angles from the fastening section 17, is firmly connected to the fastening section 17 via a plug-in connection and preferably by welding. To stiffen the structure, fastening ribs 27 are also provided, which support the abutment section 18 downwards. Two side plates form lateral brackets 20 for securing the respective support means of the platform in position.The side plates 20 have leg sections on the front that define contact surfaces for the case when the holding device 12 is lowered downwards in the event of a securing operation. In this case, the forces of the platform 7, which now rests on the securing bracket 9, are transmitted via the side plates 20 into the securing bracket 9.

[0039] Structural details of the design of the holding device 12 can be seen in Fig. 5. The holding device 12 has a holding arm 14 and an adjoining holding section 15, the holding device being constructed from a plurality of metal plates. The holding device 12 is pivotally attached to the platform 7, the pivot axis being indicated by S. The holding device 12 is pivotally mounted on the platform via a lower end of the holding arm 14. The holding section 15 is designed like a frame and forms an engagement opening 16. In the active position shown in Fig. 3, the engagement opening 16 of the holding device 12 surrounds the abutment of the securing console 9, so that in the securing case the abutment forms a stop for the holding device 12 to prevent further downward movement of the platform 7.

[0040] In Fig. 3, position securing means 21 can then be seen, which are provided to securely hold the holding device 12 in the securing bracket 9 in its active position, thereby ensuring engagement and to secure the holding device 12. The fixed positioning must be canceled so that a lifting process can be carried out and the machine platform 7 can be raised to the next higher level in the elevator shaft 2. For this lifting process, the position securing means 21 are released by removal and the holding device 12 is pivoted downward at least far enough that the holding device 12 no longer blocks the path with respect to the securing bracket 9 and an obstacle-free lifting of the machine platform 7 is possible. The arrangement can be designed such that the holding device 12 can be pivoted into an approximately vertical position.

[0041] The aforementioned position securing means 21, as can be seen from Fig. 5, comprise two threaded rods in the present embodiment, which are guided through holes in the holding section 15. The threaded rods are secured at the front by means of nuts. The threaded rods are screwed to a flat profile at the rear, which can be inserted into the securing bracket 9 via elongated holes 29 in the side plates 20 (elongated holes 29: see Fig. 4).

[0042] A lifting platform or crash deck, over which the machine platform 7 can be moved upwards, can also be equipped with similar holding devices and supported on support brackets in a similar manner to the machine platform 7 and secured by means of the holding devices via safety brackets.

[0043] The method for erecting the elevator system 1 for a building under construction with an elevator shaft 2 that increases in height during the construction phase of the building as the building increases in height, wherein the usable lifting height of the elevator system 1 is adapted to the increasing height of the building, generally comprises several lifting operations that are carried out. During the lifting operation, the machine platform 7 with the elevator drive 5 and the elevator car 3 suspended from the machine platform 7 via support means are lifted into the elevator shaft 2 by means of the lifting device 28. After the lifting operation, the machine platform 7 is installed on the smooth shaft wall 6 of the elevator shaft 2. For this installation process, the machine platform 7 is lowered on one side by means of support brackets 8, 8' fixed to the shaft wall 6 by means of anchor bolts. On the side opposite the shaft wall 6, the machine platform 7 can be lowered to the floor.On this side, machine platform 7 could also be fixed in place in another way. It is also conceivable to use support brackets and securing brackets on two opposite sides of the elevator shaft.

Claims

1. Elevator system (1) for a building under construction with an elevator shaft (2) that becomes higher as the building's height increases during the construction phase, comprising a platform (7) installed in the elevator shaft (2) that is adapted or adaptable to the increasing building height, characterized in that at least one support bracket (8) is arranged in the elevator shaft (2), which is fixed to a shaft wall (6) of the elevator shaft (2) by means of anchor screws (13), bolts, or other fastening means, the platform (7) being supported on said support bracket (8), and in that at least one securing element for defining a shaft-side fixed point is arranged in the elevator shaft (2), which is fixed to a shaft wall (6) of the elevator shaft (2) by means of anchor screws, bolts, or other fastening means, wherein securing means are connected or connectable to the securing element for securing the platform (7).

2. Elevator installation (1) according to claim 1, characterized in that the securing element is designed as a securing bracket (9).

3. Elevator installation (1) according to claim 2, characterized in that the safety bracket (9) and the support bracket (8) are designed identically.

4. Lift installation (1) according to one of claims 1 to 3, characterized in that two support brackets (8, 8') and two securing brackets (9, 9') are provided on a respective side for supporting and securing the platform (7).

5. Lift installation (1) according to one of claims 1 to 4, characterized in that the platform (7) has support means, preferably telescopically extendable and retractable, or pivotable support means (11) for supporting and that the support console (8) has lateral holders (20), in particular in the form of side plates for securing the support means in position.

6. Elevator installation (1) according to claim 5, characterized in that the support bracket (8) has a preferably plate-shaped fastening section (17) which lies or can be placed flat against the shaft wall (17) and an abutment section (18) projecting at right angles away from the fastening section (17) for fixing a support surface.

7. Elevator installation (1) according to one of claims 1 to 6, characterized in that the securing element is designed as a securing bracket (9) and that the platform (7) has at least one holding device (12) for forming securing means, which can be brought into operative connection with the securing bracket (9) or cooperates with it for securing the platform.

8. Elevator installation (1) according to claim 7, characterized in that the holding device (12) is pivotally attached to the platform (7).

9. Elevator installation (1) according to claim 7 or 8, characterized in that the holding device (12) has an engagement opening (16) which, in an active position, surrounds an abutment of the safety bracket (9).

10. Elevator installation (1) according to claim 9, characterized in that the holding device (12) has a holding arm (14) and a holding section (15) adjoining it, wherein the holding device (12) is pivotally mounted on the platform via a lower end of the holding arm and the holding section (15) adjoins an upper end of the holding arm, which is designed like a frame and forms the engagement opening (16).

11. Elevator installation (1) according to one of claims 7 to 10, characterized in that the holding device (12) comprising holding arm (14) and holding section (15) is made of one or more metal plates.

12. Elevator installation (1) according to one of claims 7 to 11, characterized in that position securing means are provided to hold the holding device (12) in the securing bracket (9).

13. Elevator installation (1) according to one of claims 1 to 12, characterized in that the support bracket (8) is positioned below the platform (7) and the securing element, in particular the securing bracket (9) is positioned above the platform (7).

14. Platform (7) for a lift installation for a building under construction with a lift shaft (2) which becomes higher as the building height increases during the construction phase of the building, in particular for a lift installation (1) according to one of claims 2 to 13, characterized in that the platform (1) has a holding device (12), which can be brought into operative connection with a securing console (9) to secure the platform.

15. Method for erecting an elevator system (1) for a building under construction with an elevator shaft (2) which becomes higher as the building height increases during the construction phase of the building, wherein a usable lifting height of the elevator system (1) is adapted to an increasing height of the building by carrying out at least one lifting process, in which lifting process a machine platform (7) with an elevator drive (5) and an elevator car (3) suspended from the machine platform (7) via support means (26) are lifted in the elevator shaft (2) by means of a lifting device (28), characterized in that after a lifting process the machine platform (7) is installed at least on one side on a smooth shaft wall (6) of the elevator shaft (2) in such a way that the machine platform (7) is anchored by means of anchor bolts,-bolts or other fastening means to the shaft wall, and that at least one securing bracket (9) is fixed to the shaft wall (6) by means of anchor screws, bolts or other fastening means, and that the machine platform (7) is secured by means of the at least one securing bracket (9).

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