BACKGROUND

The invention relates to an elevator shaft arrangement of a construction time use elevator .

The invention further relates to a method for constructing an elevator shaft of a construction time use elevator .

Construction time use elevators are temporarily-installed elevators or hoists used for transporting passengers and materials vertically in and out of a building during its construction .

A problem with known construction time use elevators is that their structure is not very stable . Therefore , speed of elevator cars must be limited and capacity limited, thus they provide slow logistics . Furthermore , known construction time use elevators have typically an open structure that may cause a disagreeable experience to passengers using the elevator .

BRIEF DESCRIPTION

Viewed from a first aspect , there can be provided an elevator shaft arrangement of a construction time use elevator, comprising

- a frame module arranged for receiving an elevator car therein, the frame module being constructed from

- a transport and/or storage unit ,

- the transport and/or storage unit being arranged vertically such that the unit define an inner space of the elevator shaft , wherein

- the frame module is attached to a building such that it provides - an access to at least one already built landing of said building, and

- an access to at least one landing to be built in said building after the attachment of the frame module to said building .

Thereby an elevator shaft arrangement of a construction time use elevator that has a structure enabling the elevator to extend safely to landings not yet built may be achieved .

Viewed from a further aspect , there can be provided a method for constructing an elevator shaft of a construction time use elevator, the method comprising

- prefabricating a frame module constructed from

- a transport and/or storage unit , arranging the frame module vertically such that the transport and/or storage unit defines an inner space of the elevator shaft ,

- attaching the frame module to a building such that it provides an access to at least one already built landing of said building, and an access to at least one landing to be built in the building after the attachment of the frame module to said building .

Thereby a method for constructing an elevator shaft of a construction time use elevator that has potentiality to provide an access to landings not yet built may be achieved .

The arrangement and the method are characterised by what is stated in the independent claims . Some other embodiments are characterised by what is stated in the other claims . Inventive embodiments are also disclosed in the speci fication and drawings of this patent appl ication . The inventive content of the patent application may also be defined in other ways than defined in the following claims . The inventive content may also be formed of several separate inventions , especially if the invention is examined in the light of expressed or implicit sub-tasks or in view of obtained benefits or benefit groups . Some of the definitions contained in the following claims may then be unnecessary in view of the separate inventive ideas . Features of the different embodiments of the invention may, within the scope of the basic inventive idea, be applied to other embodiments .

In an embodiment , the frame module is constructed from at least one shipping container .

An advantage is that shipping containers have a very strong structure and, furthermore , they are easily available all over the world . Also , there are suitable transportation and handling means everywhere .

In an embodiment , the comprises an adj ustment element arranged under the frame module , wherein the height of said adj ustment element is adj ustable for arranging the frame module in a desired height in relation to the building .

An advantage is that the elevator shaft of a construction time use elevator can be arranged quick and easily to the correct height position .

In an embodiment , the frame module is arranged to be supported by at least one of the landings of the building .

An advantage is that a simple support for the elevator shaft of a construction time use elevator can be achieved .

In an embodiment , the frame module is arranged to be supported by at least one of the landings of the building, wherein said landing is above the bottom landing of said building .

An advantage is that there is no need to extend the construction time use elevator from very bottom of the building to not yet built landings : instead, it is possible to use shorter/lower shafts that are lighter and thus easily utili zed in the building under construction .

In an embodiment , the building has at least one landing comprising a temporary opening for receiving the frame module supported by structures below said at least one landing .

An advantage is that the placement of the construction time use elevator in the building may be optimi zed .

In an embodiment , the elevator shaft arrangement is arranged in an elevator shaft or in an unfinished elevator shaft of the building .

An advantage is that the construction time use elevator utili zes a space of the building that would otherwise be a non-utili zed space .

In an embodiment , the elevator shaft arrangement is attached to a casting mould arranged in the building for casting the elevator shaft thereof .

An advantage is that moulding personnel may utili ze the construction time use elevator in their work easily .

In an embodiment , the elevator shaft arrangement is attached to the casting mould with an adaptor element allowing adj ustment of the elevation of the elevator shaft arrangement in relation to the casting mould . An advantage is that it is not always necessary to move the elevator shaft arrangement although the mould raises with advancing moulding process .

In an embodiment , the elevator shaft arrangement comprises a machinery for driving moving elevator components .

An advantage is that the machinery is straightforwardly provided for use in the construction time use elevator .

In an embodiment , the machinery is arranged in the shaft of the elevator .

An advantage is that a separate machine room that could expand dimensions of the elevator is not necessary .

In an embodiment , the machinery is arranged in a machine room arranged above the shaft of the elevator, and optionally, the machine room comprises a machinery module comprising at least part of components of the machinery, the machinery module being attached detachably to the frame of the machine room so that the height position of the machinery module is changeable in relation to said frame of the machine room module .

An advantage is that further raising of the construction time use elevator may be simple .

In an embodiment , the topmost module comprises a roof consisting of a sloped surface , such as a ridge roof , a shed roof , or a hip roof .

An advantage is that the construction time use elevator may be in shelter against the elements , especially raining . In an embodiment , the machinery is arranged in a machine room arranged below the construction time use elevator shaft .

An advantage is that the typical ly heavy machinery lies down, which makes the shaft more stable e . g . in hard wind .

In an embodiment , the elevator shaft arrangement comprises a weather-proof roof module detachable arrangeable on a hori zontally stored frame module .

An advantage is that the frame module may be stored sheltered against the elements .

BRIEF DESCRIPTION OF FIGURES

Some embodiments illustrating the present disclosure are described in more detail in the attached drawings , in which

Figure la is a schematic end view of a transport and/or storage unit ,

Figure lb is a schematic side view of the transport and/or storage unit shown in Figure la,

Figure 2 is a schematic top view of an elevator in partial cross-section,

Figure 3 is a schematic side view of an elevator shaft element ,

Figure 4 is a schematic top view of a detail of an elevator shaft element in partial cross-section,

Figure 5 is a schematic side view of an elevator shaft partially cut open, Figure 6 is a schematic end view of an elevator shaft element in partial cross-section,

Figure 7 is a schematic side view of an elevator shaft arrangement ,

Figure 8 is a schematic side view of another elevator shaft arrangement ,

Figure 9 is a schematic side view of a third elevator shaft arrangement ,

Figure 10 is a schematic side view of a fourth elevator shaft arrangement ,

Figure 11 is a schematic side view of a fifth elevator shaft arrangement ,

Figure 12 is a schematic side view a machine room, and

Figure 13 illustrates a method for constructing an elevator shaft of a construction time use elevator .

In the figures , some embodiments are shown simplified for the sake of clarity . Similar parts are marked with the same reference numbers in the figures .

DETAILED DESCRIPTION

Figure la is a schematic end view of a transport and/or storage unit , and Figure lb is a schematic side view of the transport and/or storage unit shown in Figure la .

According to an aspect of the invention, an elevator shaft of a construction time use elevator is constructed from at least one elevator shaft element that comprise a frame module . In an embodiment, the frame module is constructed from a transport and/or storage unit 4 that has a four-cornered cross-section and comprises two side walls 5, a bottom wall 6 and a roof wall 7, and preferably made of metal, such as steel. The outer surface of the side walls 5 may comprise corrugations (as shown in Figure 1) , but this is not an obligatory feature of the unit 4.

In an embodiment, the frame module is constructed from a shipping container. The shipping container may be e.g. an International Standards Organization (ISO) shipping container or some another intermodal container, mostly of either twenty or forty feet (6.1 or 12.2 m) standard length and having height of 8 feet 6 inches (2.6 m) or 9 feet 6 inches (2.9 m) . The latter are known as High Cube or Hi- Cube (HO) containers. It is to be noted, however, that the container may have dimensions varying from those mentioned above .

In an embodiment, the transport and/or storage unit 4 from which the frame module is constructed is a unit of a site hut or another unit intended mainly for residential or office use. In this embodiment, the side walls 5, a bottom wall 6 and/or a roof wall 7 of the unit 4 may comprise openings (for door, window etc.) that are optionally closed when the module is prepared for use as the frame module, or alternatively utilized in manufacturing the frame module.

Figure 2 is a schematic top view of a construction time use elevator in partial cross-section. The elevator shaft of the construction time use elevator is constructed from at least one elevator shaft element 1 that comprises a frame module 2. In an embodiment, the frame module 2 is constructed from a transport and/or storage unit 4 de- scribed above . The unit 4 is arranged vertically such that the side walls 5 , bottom wall 6 and upper wall 7 of the unit define an inner space 8 of the elevator shaft .

At least one elevator car guide 9 is attached to the frame module 2 for guiding movement of the elevator car 3 in the elevator shaft element 1 .

In an embodiment , the elevator car guide 9 is attached directly to the elevator shaft element 1 . In another embodiment , the elevator car guide 9 is attached to mounting brackets that are mounted to the elevator shaft element 1 . The attachment of the elevator car guide 9 may be reali zed by e . g . fixation means , such as bolts , or by welding .

The frame module 2 constitutes an inner perimeter 10 of a load bearing structure adapted for bearing the loads caused by operating the elevator . In an embodiment , the frame module 2 also constitutes an outer perimeter 11 of said load bearing structure . Said loads comprise not only loads of normal operating of the elevator, but also loads ( often high ones ) that incur in an emergency situation when gripping devices are activated for stopping the movement of the elevator car .

In an embodiment , such as shown in Figure 2 , the elevator 1 has its counterweight 14 arranged at side of the elevator car 3 . This makes it possible to arrange an access to the elevator car 3 opposite sides thereof , which may be advantageous in some elevator arrangements . In another embodiment , the counterweight 14 is arranged back of the elevator car 3 relative to an opening 15 made for landing doors . The decision-making about which one of these two embodiments is selected depends on multiple factors . In an embodiment, the door leaf 16 of a landing door is arranged in the opening 15. The door leaf may be e.g. of guillotine type, i.e. the leaf moves in vertical direction.

Figure 3 is a schematic side view of an elevator shaft element. The elevator shaft element 1 comprises a frame module 2 that is arranged for receiving an elevator car 3 therein. The frame module 2 is constructed from a transport and/or storage unit 4 that comprises side walls 5, a bottom wall 6 and a roof wall 7. The unit 4 is arranged vertically such that said side walls 5, bottom wall 6 and roof wall 7 of the unit 4 define an inner space 8 of the elevator shaft.

In an embodiment, such as shown in Figure 3, one of the side walls, the bottom wall or the roof wall has been opened at a length more than a floor height F of a building for providing an opening 15 for one or more landing doors. In an embodiment, the frame module 2 comprises landing openings to two landings. In another embodiments, the frame module 2 comprises landing openings to three or even more landings.

In an embodiment, such as shown in Figure 3, the width of the opening 15 is less than the width of the wall provided with the opening. In another embodiment, the opening 15 is as broad as said wall, e.g. if the opening is made to the roof wall 7, the side-edges 17a, 17b of the opening lie at the side walls 5.

In an embodiment, such as shown in Figure 3, the opening 15 extends over all the length of the transport and/or storage unit 4, i.e. from its first end to its second end. In an embodiment , the opening 15 is arranged in the bottom wall 6 or the roof wall 7 of the transport and/or storage unit 4 , preferably in the roof wall 7 as shown in Figure 3 .

The opening 15 has a first side-edge 17a and a second side-edge 17b that are parallel to longitudinal direction L of the transport and/or storage unit 4 .

In an embodiment , at least one stiffening beam 18 is arranged to the opening 15 extending from the first sideedge 17a to the second side-edge 17b . The beam is preferably perpendicular to the side-edges . The embodiment of the elevator shaft element 1 shown in Figure 3 comprises four stiffening beams 18 . It is to be noted, however, that there may be les s or more than four beams 18 crossing the opening 15 . One of the functions of the beam 18 is to stiffen the structure of the frame module .

In an embodiment , the beam 18 constructed from a profile beam or a box beam made of metal , such as a steel .

In an embodiment , such as shown in Figure 3 , all the beams have same dimensions . In another embodiment , there are differently dimensioned beams in the elevator shaft element 1 .

In an embodiment , the stiffening beam 18 is arranged not only to stiffen the structure but also serve as a threshold for a landing door opening, or at least to support a separate threshold element .

In an embodiment , the stiffening beam 18 comprises fixing means 19 ( shown in Figure 4 ) that allows a releasable attachment of the stiffening beam 18 with the frame module 2, and the frame module 2 comprises counter fixing means 23 that are arranged for receiving the fixing means 19.

The counter fixing means 23 may comprise e.g. a metal profile or beam attached to the frame module 2 parallel with the longitudinal direction L thereof.

The fixing means 19 may comprise e.g. a clamp or another type of detachable fixing means that provides an adjustment of a height position for the stiffening beam 18 according to the floor height F of the building. The adjustment may be implemented as a stepless adjustment or, alternatively, as an adjustment with steps.

In another embodiment, the stiffening beam 18 is simply attached directly to the wall of the frame module 2 using e.g. bolts. For instance, bolt holes are drilled in a suitable height in the wall, and bolts or threaded taps are fitted through the holes for attaching the stiffening beam 18.

Figure 5 is a schematic side view of an elevator shaft partially cut open. In an embodiment, the construction time use elevator shaft 22 comprises two elevator shaft elements 1 or frame modules 2 arranged vertically and attached one on top of the other. In another embodiment, the construction time use elevator shaft 22 comprises more than two elevator shaft elements 1 arranged attached one on top of the other. In still another embodiment, the elevator shaft comprises just one elevator shaft element 1.

In an embodiment, such as shown in Figure 5, all the elevator shaft elements 1 of the elevator shaft have an equal length. However, this is not always necessary; in other words, the construction time use elevator shaft 22 may comprise longer and shorter elevator shaft elements 1, constructed from e.g. a suitable mixture of twenty- and forty-feet shipping containers.

In an embodiment, the construction time use elevator shaft 22 comprises a machinery 21 for driving moving elevator components. The machinery 21 may comprise e.g. an electric motor and a traction sheave driven by means of the electric motor. The moving elevator components comprises at least an elevator car 3, but typically also a counterweight 14.

In an embodiment, the machinery 21 is arranged in the up- most elevator shaft element. In another embodiment, the elevator shaft element 1 that is arranged lowest comprises the machinery 21. Thus, the elevator may be a so-called machine room less elevator or a low headroom elevator. The machinery 21 may be attached to the elevator car guide 9, for instance.

Figure 6 is a schematic end view of an elevator shaft element in partial cross-section. Usually, it is practical to store the elevator shaft elements or modules in a horizontal position. Two or even more elements may be stored in piles one on top of another. Storing of the elements may take place e.g. on the building site prior to the assembly of the construction time use elevator. A detachable weather-proof roof module 33 may be arranged on the horizontally stored frame module (s) 2. The roof module 33 consists preferably of a sloped surface, such as a ridge roof, a shed roof, or a hip roof.

Figure 7 is a schematic side view of an elevator shaft arrangement of a construction time use elevator. The arrangement 100 comprises an construction time use elevator shaft 22 that comprises one or more frame modules 2 described in this disclosure. The embodiment of the con- struction time use elevator shaft 22 shown in Figure 7 comprises plurality of frame modules 2 frame modules 2 . An elevator car can be arranged in the construction time use elevator shaft 22 for passenger transportation and/or for goods transportation .

The construction time use elevator shaft 22 and the frame modules thereof are attached to a building 27 . In the embodiment shown in Figure 7 , the construction time use elevator shaft 22 is arranged outside the building 27 . The construction time use elevator shaft 22 provides an access to at least one already built landing 28 of said building and an access to at least one landing to be built in the building 27 after the attachment of the frame modules 2 to said building . In the embodiment shown in Figure 7 , the construction time use elevator shaft 22 provides an access to four already built landings 28 and to two landings to be built ( shown by dotted lines ) .

Figure 8 is a schematic side view of another elevator shaft arrangement . In an embodiment , the construction time use elevator shaft 22 is arranged inside the building 27 .

In an embodiment , such as shown in Figure 8 , the construction time use elevator shaft 22 extends from the lowest landing 28 to the highest landing 28 of a finished building 27 .

In an embodiment , the frame module 2 is arranged to extend through at least one temporary opening 29 made or provided to a structure separating two landings 28 in the building . The temporary opening 29 can be manufactured on-the-spot , or it may be a pre-fabricated feature of the structure . Following removing of the frame module 2 , the temporary opening 29 may be closed or it may be utili zed in other purposes .

Figure 9 is a schematic side view of a third elevator shaft arrangement . In an embodiment , the frame module 2 is arranged to be supported by at least one of the landings 28 , "a supporting landing" , of the building . In an embodiment , the supporting landing is the lowest landing of the building 27 . In another embodiment , the elevator shaft arrangement 100 is arranged above one or more of the lowest landings of the building so that it provides access to one or more upper landings without access to said one or more of the lowest landings . For instance , Figure 9 is showing an embodiment where the supporting landing is third landing and the elevator shaft arrangement 100 provides access to said third landing and landings thereon .

In an embodiment , there is another elevator and elevator shaft 35 in the building that is arranged to provide an access to those landings not directly accessible by the construction time use elevator . Said another elevator may be e . g . another construction time use elevator, the structure of which may be similar with the construction time use elevator described in this disclosure , but not necessary .

Figure 10 is a schematic side view of a fourth elevator shaft arrangement . In an embodiment , the construction time use elevator shaft 22 is arranged in an elevator shaft 36 under construction and intended for permanently use in the building . The construction time use elevator shaft 22 may be supported to landing openings 15 , for instance .

In an embodiment , the elevator shaft arrangement 100 comprises an adj ustment element 25 arranged under the lowest frame module 2 , i . e . under the construction time use ele- vator shaft 22 . The adj ustment element 25 is supported by a landing or another rigid structure of the building . The height of the adj ustment element 25 can be adj usted, preferably in a stepless way, so that the frame module 2 and the construction time use elevator shaft 22 as a whole is in correct height position in relation to the building 27 .

Figure 11 is a schematic side view of a fifth elevator shaft arrangement . In an embodiment , the construction time use elevator shaft 22 or a frame module 2 thereof is attached to a casting mould 12 that is used for casting an elevator shaft 36 of an elevator intended for permanently use in the building .

In an embodiment , the construction time use elevator shaft 22 is attached to the casting mould 12 with an adaptor element 13 . The adaptor element 13 makes it possible to adj ust the elevation of the arrangement 22 in relation to the casting mould 12 . Thus , the casting mould 12 may be risen while the arrangement 22 stays in place .

Figure 12 is a schematic side view a machine room . In an embodiment , the upmost elevator shaft element 1 , or at least an upmost section thereof , creates a machine room 34 , where the machinery 21 is arranged in . In another embodiment , the machinery 21 is arranged in a separate machine room 34 arranged above the construction time use elevator shaft 22 . The separate machine room 34 may be construed to a transport and/or storage unit , for instance .

In an embodiment , the machine room 34 comprises a machinery module 26 that comprises at least part of components of the machinery 21 needed for running the construction time use elevator, i . e . using the hoisting 20 thereof . The machinery module 26 can be transported and assembled as an entity . It is to be noted herein that the hoisting of the elevator shaft arrangement 100 may be constructed from at least one rope or at least one belt , or it may comprise not only at least one rope but also at least one belt .

In an embodiment , the machinery module 26 is attached detachably to the machine room 34 . This enables changing the height position of the machinery module in relation to the machine room . The machine room 34 may comprise a lifting device 31 to be used in chancing the height position of the machinery module 26 in relation to the machine room . There is an openable locking device 30 that keeps the machinery module 26 in place in relation to the machine room .

In an embodiment of the method, the height position of the machinery module 26 in relation to the machine room 34 is changed so that the counterweight 14 is first lowered on a prop 37 . Then, the elevator car 3 is close to the machinery module 26 . The elevator car 3 is connected and locked to the machinery module 26 by e . g . a pulley 24 . Then, the machinery module 26 and the elevator car 3 connected thereto are lifted by a lifting device 31 . As the lifting device 31 holds up the weight of the machinery module 26 and the elevator car 3 , the locking device 30 may be opened and the height position of the machinery module 26 changed . As the intended hight position is reached, the locking device 30 is used for keeping the machinery in said position .

In an embodiment , the uppermost elevator shaft element 1 is provided with a roof 32 . The roof may be quickly mounted and demounted, and it provides shelter against the elements . In an embodiment , the roof 32 comprises a sloped surface , such as a ridge roof , a shed roof , or a hip roof . In an embodiment , the elevator shaft element 1 that is arranged lowest , or at least a bottom section thereof , creates a machine room 34 , where the machinery 21 is arranged in . Thus , one can contemplate that the elevator shaft ar- rangement 100 comprises a pit comprising the machinery 21 .

In still another embodiment , the machinery 21 is arranged in a separate machine room 34 arranged below the construction time use elevator shaft 22 and attached to an elevator shaft element 1 lowest in the shaft . The separate ma- chine room 34 may be arranged in a transport and/or storage unit , for instance .

In the embodiments where the machinery 21 is arranged below the elevator shaft , a guiding wheel or pulley arrange- ment (not shown) may be arranged in the upper part of the elevator shaft for guiding the hoisting 20 of the elevator . In an embodiment , the guiding wheel arrangement can be released from a first location and fixed in another location in the elevator shaft . For example , if a further elevator shaft element 1 is attached on the elevator shaft 22 , the guiding wheel arrangement can be released and lifted to the new upmost elevator shaft element 1 and attached therein in a suitable location . Figure 9 is showing two alternatives for arranging the machine room 34 in the elevator shaft arrangement 100 , i . e . on the top of the arrangement or at the bottom of the arrangement . I f the machine room 34 is arranged at the bottom of the arrangement , there may be a need for create a temporary opening 29 for the machine room .

Figure 13 illustrates a method for constructing an elevator shaft of a construction time use elevator . In the method it is prefabricated 200 a frame module 2 construct- ed from a transport and/or storage unit 4 . At the building site , the frame module 2 is arranged 201 vertically such that the transport and/or storage unit 4 defines an inner space 8 of the elevator shaft of the construction time use elevator . The frame module 2 is attached 202 to a building 27 such that it provides an access to at least one already built landing of said building, and further an access to at least one landing that is not yet built but will be built in the building after the attachment of the frame module 2 to said building .

In an embodiment of the method, the prefabrication 200 comprises opening 200a the side wall , the bottom wall or the upper wall of the transport and/or storage unit at a length more than a floor height of a building for providing an opening 15 for one or more landing doors . In an embodiment , the prefabrication 200 comprises arranging 200b at least one stiffening beam 18 to the opening extending from the first side-edge to the second side-edge for stiffening the structure of the frame module .

In an embodiment of the method, the step of attaching 202 the frame module 2 the building 27 comprises arranging 202a an adj ustment element 25 under the lowest frame module 2 and adj usting 202b the height of the frame module 2 in a desired height in relation to the building .

In an embodiment of the method, the step of attaching 202 the frame module 2 the building 27 comprises arranging 202c the frame module 2 to be supported by at least one of the landings 28 of the building .

In an embodiment of the method, the step of attaching 202 the frame module 2 the building 27 comprises providing 202d at least one landing 28 with a temporary opening 29 , arranging 202e the frame module 2 through the temporary opening and attaching 202 f and supporting the frame module 2 to the building while the frame module 2 lies in the temporary opening .

In an embodiment of the method, the step of attaching 202 the frame module 2 the building 27 comprises arranging 202g the frame module in an elevator shaft or in an unfinished elevator shaft intended for permanent use in the building .

In an embodiment of the method, the step of attaching 202 the frame module 2 the building 27 comprises attaching 202h the frame module 2 to a casting mould 12 , optionally using an adaptor element 13 , arranged in the building for casting the elevator shaft thereof and running the casting work while the frame module being attached to said casting mould .

In an embodiment of the method, the step of attaching 202 the frame module 2 the building 27 comprises arranging 202 i a number of frame modules 2 one after another until the required length of the construction time use elevator shaft has been reached .

The invention is not limited solely to the embodiments described above , but instead many variations are possible within the scope of the inventive concept defined by the claims below . Within the scope of the inventive concept the attributes of different embodiments and applications can be used in conj unction with or replace the attributes of another embodiment or application .

The drawings and the related description are only intended to i llustrate the idea of the invention . The invention may vary in detail within the scope of the inventive idea defined in the following claims . REFERENCE SYMBOLS

1 elevator shaft element

2 frame module

3 elevator car

4 transport and/or storage unit

5 side wall

6 bottom wall

7 roof wall

8 inner space

9 elevator car guide

10 inner perimeter

11 outer perimeter

12 casting mould

13 adaptor element

14 counterweight

15 opening

16 door leaf

17a, b side-edge

18 stiffening beam

19 fixing means

20 hoisting

21 machinery

22 construction time use elevator shaft

23 counter fixing means

24 pulley

25 adj ustment element

26 machinery module

27 building

28 landing

29 temporary opening

30 locking device

31 lifting device

32 roof

33 roof module

34 machine room 35 second construction time use elevator shaft

36 elevator shaft

37 prop 100 elevator shaft arrangement

200 -2021 method steps

F floor height L longitudinal direction