KR20090061776A

KR20090061776A - Elevator pit structure

Info

Publication number: KR20090061776A
Application number: KR1020070128717A
Authority: KR
Inventors: 엄기형
Original assignee: 엄기형
Priority date: 2007-12-12
Filing date: 2007-12-12
Publication date: 2009-06-17

Abstract

The present invention provides an elevator pit bottom structure for forming an elevator pit, comprising: a bottom portion positioned at the bottom of an elevator pit; And a mold coupled upwardly along the outer side of the bottom portion to form an open space above the center of the bottom portion, and at least one buffer member installed at the top of the bottom portion. Relates to the bottom structure.

According to the present invention, the shock absorbing spring is firmly installed above the bottom portion, so that the shock is absorbed when the elevator falls to the elevator pit or when the elevator is lowered for the maintenance of the elevator. It is effective to provide a bottom structure of the elevator pit that can.

Description

Elevator Pit Bottom Structure {ELEVATOR PIT STRUCTURE}

The present invention relates to a lower structure of the elevator pit, and more particularly, when forming the lower end of the elevator pit, it does not require a configuration for forming a complex concrete structure, the construction transport is easy, and the production cost is low It is about a structure.

The elevator pit should provide a space to check the elevator from below, and for this purpose it is configured at the bottom to have a space about 2 meters above the bottom of the lowest floor. The elevator pit structure is designed to support the load of the building by the wall, the load of the wall is transmitted to the ground through the bottom structure of the lower portion. To this end, a base structure for supporting it at the bottom of the elevator pit should be formed, and at the same time, a space for checking the elevator should be secured.

In order to provide such a structure, conventionally, this structure was formed of a concrete structure through formwork, which is expensive due to the difficult reinforced concrete work, there is a problem that the construction period is increased.

In order to solve the above problems, an object of the present invention is to provide an elevator pit bottom structure provided with an elevator support buffer in the steel structure without forming a concrete structure that requires a lot of air.

It is also an object of the present invention to provide an elevator pit bottom structure in which a shock absorbing spring configured to absorb an impact is firmly positioned at an upper portion of the bottom, so that the shock absorbing spring does not deviate to the outside even under a strong impact due to the load of the elevator. It is done.

In order to achieve the above object, the present invention is an elevator pit bottom structure for forming an elevator pit, the bottom portion located at the bottom of the elevator pit; And a mold coupled upwardly along the outer side of the bottom portion to form an open space above the center of the bottom portion, and at least one buffer member installed at the top of the bottom portion. Provide the bottom structure.

In addition, the present invention, the elevator pit bottom structure for forming an elevator pit, the bottom portion located at the bottom of the elevator pit; And a sidewall formed upwardly along an outer side of the bottom portion so that a space opened to the center upper side of the bottom portion is formed, and at least one buffer member installed at an upper portion of the bottom portion. Provide the bottom structure.

In addition, the present invention, the elevator pit bottom structure for forming an elevator pit, the bottom portion located at the bottom of the elevator pit; And a mold coupled upwardly along an outer side of the bottom portion to form a space open to an upper center of the bottom portion, wherein the first concrete portion is formed by pouring a cement mixture on the top portion of the bottom portion, and the first concrete. Provided is an elevator pit bottom structure, characterized in that it comprises at least one buffer member installed on the upper portion, and the second concrete portion formed on the upper portion of the first concrete portion.

In addition, the present invention, the elevator pit bottom structure for forming an elevator pit, the bottom portion located at the bottom of the elevator pit; And a first concrete part including a side wall formed upward along an outer side of the bottom part so that a space opened to an upper center of the bottom part is formed, and a cement mixture is poured on the top part of the bottom part; Provided is an elevator pit bottom structure, characterized in that it comprises at least one buffer member installed on the upper portion, and the second concrete portion formed on the upper portion of the first concrete portion.

In addition, it provides an elevator pit bottom structure characterized in that it comprises a concrete portion formed by pouring a cement mixture on top of the bottom portion.

In addition, a plurality of reinforcing members are provided on an upper portion of the bottom portion, and the cement mixture provides an elevator pit bottom structure, wherein the cement mixture is poured into a space located between each of the reinforcing members.

In addition, the reinforcing member provides an elevator pit bottom structure, characterized in that consisting of a plate-shaped reinforcing rib.

In addition, the reinforcing member is in the form of a long beam, the cross section is triangular, square, circle, 'H', 'I''c','b' or '

It provides an elevator pit bottom structure, characterized in that formed in any one of the 'shape.

In addition, the second concrete part is formed by pouring a cement mixture, the lower end of the buffer member, the upper end of the reinforcing member and the cement mixture is configured to be firmly connected to each other by the cement mixture Provides a pit bottom structure.

In addition, the buffer member provides an elevator pit bottom structure, characterized in that consisting of a buffer spring.

In addition, the concrete unit provides an elevator pit bottom structure, characterized in that composed of pressed concrete.

In addition, the second concrete unit provides an elevator pit bottom structure, characterized in that composed of pressed concrete.

In addition, the upper portion of the bottom provides an elevator pit bottom structure, characterized in that one or more engaging projections are formed.

The present invention does not require a configuration for forming a complex concrete structure through the formwork, it is effective to provide a lower structure of the elevator pit that can reduce the construction cost and construction period due to the reinforced concrete work.

In addition, the present invention has the effect of providing a lower structure of the elevator pit to ensure the lower support strength through the three-dimensional bottom, even without a plurality of steel ribs.

In addition, the present invention due to the solid structure of the floor, without burdening the building load or bearing strength, because it bears only the buoyancy and relatively low level of load, bearing strength for upward hydraulic pressure, by making the floor concrete layer thin, There is an effect of providing a lower structure of the elevator pit that can reduce the construction cost and shorten the air.

In addition, the present invention provides a lower structure of the elevator pit to lower the elevator by the height of the buffer spring when the elevator is lowered for repair or inspection, so that the operator can easily repair, etc. It is effective.

In addition, the present invention is to ensure that the shock absorbing spring is installed firmly above the bottom, so that when the elevator falls to the elevator pit, or when lowering the elevator for elevator maintenance, the shock is absorbed, and the elevator is firm There is an effect of providing a lower structure of the elevator pit that can be supported.

Hereinafter, the configuration of the present invention will be described in detail with reference to embodiments of the present invention shown in the accompanying drawings.

1 is a view schematically showing a case in which a conventional structure is installed at the bottom of an elevator pit. 1A and 1B, a conventional bottom structure 100 is disposed on a bottom surface 1 at the bottom of an elevator pit of a building B, and a concrete layer 3 is poured around to form a layer. do. At this time, the bottom surface (1) to form a bottom installation groove (1a ') by digging in order to arrange the bottom structure 100, and then the discarded concrete layer (2) is poured on it. The discarded concrete layer 2 may be omitted depending on site conditions.

The lower structure 100 is disposed in the bottom installation groove 1a ′ so that an open space is formed on the bottom surface 1. And the bottom concrete layer (3) is poured out of the lower structure 100 to form a layer. At this time, the bottom concrete layer (3) is also poured into the bottom of the lower structure 100, so that the lower structure 100 is supported by a solid structural strength.

And the depth of the floor installation groove (1a ') is proportional to the depth (d) of the bottom concrete layer (3) is placed on the top of the bottom surface, depending on the site conditions, is configured to be larger or smaller than the depth (d) In detail, the lower portion of the lower structure 100 is lowered from the first depth d 'at which the lower portion of the lower structure 100 is positioned so as to secure a space for checking the elevator, and the nostalgic pressure caused by the building load or the groundwater. It consists of a second depth d " on which the bottom concrete layer 3 is poured so as to be supported by a rigid structural strength.

However, the deeper the depth (d ', d') of the floor installation groove (1a '), the more the construction cost and construction period increases, so the first depth (d') or the second depth (d ' It is desirable to reduce the cost by reducing '). However, since the first depth d 'is a space for checking the elevator, it is practically impossible to reduce the first depth d'. Therefore, in the present invention, the second depth d '' is made small, and an elevator pit lower structure 10 (shown in FIG. 2) having a strong bearing force is installed in the floor mounting groove 1a (shown in FIG. It can be configured to remain robust and to reduce construction costs.

Meanwhile, one or more buffer springs 110 are installed above the bottom of the lower structure to absorb the shock when the elevator falls to the elevator pit or when the elevator is lowered to the bottom of the lower structure for repair of the elevator. It is configured to. However, since the shock absorbing spring 110 fixed to the bottom of the conventional lower structure 100 is difficult to be firmly installed in the structure, there is a problem that the shock absorbing spring 110 is separated to the outside by the load of the elevator in some cases.

2 is a view showing a case in which the structure of the present invention is installed at the bottom of the elevator pit.

Referring to Figure 2, the elevator pit bottom structure 10 of the present invention is disposed on the bottom surface (1) of the bottom of the elevator pit of the building (B), the concrete layer (3) is poured around the floor again Is achieved. At this time, the bottom surface (1) to form a floor installation groove (1a) by digging, so that the elevator pit bottom structure 10 of the present invention in the floor installation groove (1a).

The depth of the floor installation groove 1a 'is the first depth d' in which the lower portion of the lower structure 100 is positioned so as to secure a space for checking the elevator, and the lower structure (from the upward hydraulic pressure due to a building load or groundwater). The bottom of the 100 is composed of a second depth d '' 'in which the bottom concrete layer 3 is cast so as to be supported by a rigid structural strength.

However, the deeper the second depth d '' 'of the floor mounting groove 1a', the more the construction cost and construction period are increased, so in the present invention, the second depth d '' 'is made smaller. By forming and having a strong structure of the elevator pit lower structure 10, that is, the bottom portion 12 of the solid structure, and the first and second concrete portions 20, 22 (shown in Fig. 3), etc., which are configured in duplicate, Even if the second depth d '' 'is not formed as deep as the conventional depth d' '(shown in FIG. 1A), the elevator pit can be supported with a solid structural strength from an uplift pressure due to a building load or groundwater.

As such, the lower structure 10 of the present invention can reduce the second depth (d '' ') of the floor installation groove (1a), there is an effect that can reduce the construction cost and shorten the air.

Further, at least one buffer spring (shown in FIG. 3) is installed above the first concrete part 20 (shown in FIG. 3) to absorb the impact when the elevator descends to the bottom of the elevator pit. Of course, to support the elevator so that the operator can work below the elevator during maintenance or repair, so as to secure a space on the lower side of the elevator by the height of the buffer spring (25). And the shock absorbing spring 25 is configured to be firmly fixed above the first concrete portion 20, and thus is configured to support it even if a strong impact such as an elevator load is applied to the shock absorbing spring 25.

Hereinafter, with reference to the accompanying drawings, it will be described in more detail the elevator pit bottom structure 10 according to a preferred embodiment of the present invention.

3 is a view showing an embodiment in which the elevator pit bottom structure of the present invention is installed.

Referring to Figure 3, the elevator pit bottom structure 10 of the present invention is a cast concrete layer (not shown) is cast on the flat bottom surface 1, the bottom portion 12 is provided including it. At this time, the bottom installation groove (1a) is formed on the top of the bottom surface 1, the bottom portion 12 and the buffer member may be located in the bottom installation groove (1a), according to the site conditions, discarded concrete layer ( Not shown) may be poured or omitted in the upper portion of the floor installation groove (1a).

And the mold 14 is configured to be coupled vertically upward along the outer side of the bottom portion 12 so that an open space is formed on the top surface of the bottom portion 12. And the concrete layer 3 is poured out of the mold 14 to form a layer.

The bottom portion 12 is formed in a plate shape having a certain thickness to secure the internal strength and the support strength. The bottom portion 12 thus formed is configured to serve as the bottom of the elevator pit. And the bottom part 12 can also be cut and used to a size suitable for a site as needed.

The material of the bottom part 12 may be made of a metal or cement mixture. When the bottom part 12 is made of a cement mixture, reinforcing bars (not shown) are vertically and horizontally disposed therein, and the bottom part ( 12 can be formed more firmly, and a plurality of bottom portions 12 may be provided, and each bottom portion 12 may be connected to each other.

Due to the bottom portion 12 that is firmly configured, even if the second depth d '' 'of the bottom mounting groove 1a is made smaller than the conventional depth d' ', the bottom mounting groove 1a It is configured to firmly support the upward hydraulic pressure and building load, and the space inside the elevator pit is also configured to firmly support.

The cushioning member absorbs the impact when the elevator falls to the lower part of the elevator pit, and supports the space to be secured to the lower side of the elevator by the height of the buffering member so that an operator can work below the elevator during maintenance or repair of the elevator. Make sure And the shock absorbing member is composed of a shock absorbing spring 25, one or more installed above the bottom portion 12, is firmly coupled by a welding or fastening member, the shock absorbing spring 25 absorbs the impact of the elevator Do it.

Thus, the shock absorbing spring 25 serves to support the elevator so that when the elevator falls, to absorb the impact, or when servicing the elevator, the operator can work below the elevator.

The mold 14 is formed vertically along the outer side of the bottom portion 12 so that a space opened to the center side of the bottom portion 12 is formed, and the worker is placed on the upper side of the bottom portion 12 by the mold 14. There is provided a space for working, and the floor 12 and the mold 14, the load of the building is supported, while at the same time a space for checking the elevator is secured. And the size, height of the mold 14 may be formed and provided in accordance with the situation of the site, or may be used to cut to a size suitable for the site. The mold 14 may be configured integrally or separately with the bottom part 12, and in the case of a separate coupling type, may be removed depending on the construction environment after the completion of construction.

4 is a view showing another embodiment in which the elevator pit bottom structure of the present invention is installed.

Referring to Figure 4, the elevator pit bottom structure 10 of the present invention is further provided with a concrete portion 22 on the upper portion of the bottom portion 12 is installed buffer spring 25 in FIG.

The concrete part 22 is formed by pouring a cement mixture on the top of the bottom part 12. At this time, the bottom part 12 and the cement mixture are firmly connected to each other, and the bottom part 12 is more firm. As a result, the bottom portion 12 has a stronger bearing force, so that even if the second depth d '' 'of the floor installation groove 1a is smaller than the conventional depth d' ', the floor installation groove ( It is configured to firmly support the upward hydraulic pressure and building load from 1a), and the space inside the elevator pit is also configured to be firmly supported.

In addition, while the cement mixture is poured on top of the bottom 12, the bottom of the buffer spring 25, the top of the bottom 12, and the concrete part 22 are firmly connected to each other, and the shock spring 25 ) Is firmly located above the bottom 12, the shock absorbing spring 25 is configured so that the shock spring 25 does not escape to the outside even in a strong impact such as an elevator.

And the concrete portion 22 is preferably composed of pressed concrete. That is, by placing the push concrete on the top of the bottom part 12, the buffer spring 25 is firmly positioned on the top of the bottom part 12, and the worker works on the flat pressed concrete to move. This facilitates and improves the working environment.

5 is a view showing another embodiment in which the elevator pit bottom structure of the present invention is installed.

Referring to FIG. 5, the elevator pit bottom structure 10 of the present invention is configured to further include a reinforcing member 16 in FIG. 4.

The reinforcing member 16 is for securing the support strength, and is composed of a long reinforcing rib, and a plurality of reinforcing ribs may be configured to be continuously arranged on the top of the bottom portion 12.

When the cement mixture is poured on the upper portion of the bottom portion 12 to form the concrete portion 22, the reinforcing member 16 and the cement mixture are firmly connected to each other, thereby making the concrete portion 22 more firm. As a result, the bottom portion 12 has a stronger bearing force, so that even if the second depth d '' 'of the floor installation groove 1a is smaller than the conventional depth d' ', the floor installation groove ( It is configured to firmly support the upward hydraulic pressure and building load from 1a), and the space inside the elevator pit is also configured to be firmly supported.

6 is a view showing another embodiment in which the elevator pit bottom structure of the present invention is installed.

Referring to FIG. 6, the elevator pit bottom structure 10 of the present invention is configured to further include a reinforcing member 18 and a locking protrusion 27 in FIG. 4.

The reinforcing member 18 is composed of a three-dimensional shape having a thickness for securing the internal strength and the support strength, and is configured to have a strong strength due to the support structure on the inside. The reinforcing member 18 is in the form of a long beam, and a plurality of reinforcing members are arranged in a row at the top of the bottom portion 12, and the cross section is triangular or square or circle or 'H' or 'I' or 'c' or 'ㄴ' or '

It may be formed in any one of a 'shape, and preferably formed in a' H 'shape. And it is obvious that the cross-sectional shape of the reinforcing member 18 is not limited thereto, and may be configured in various forms having a three-dimensional shape according to the construction environment.

And the reinforcing member 18 is configured such that an empty space is formed inside, the empty space is filled with a cement mixture such as mortar, or the cement mixture in the construction site in the form 14 of the reinforcing member 18 in the construction site It may be manufactured to be filled.

The three-dimensional reinforcement member 18 is light in weight and easy to manufacture and transport, but has the advantage of having a very high structural strength. For this reason, there is no need to additionally install an auxiliary support structure such as a separate rib. In addition, the reinforcing member 18 is empty so that the weight does not go out much, it is possible to easily carry the mass-produced products in the factory to the site. The reinforcing member 18 transported to the site has an advantage that the strength can be selectively doubled by filling the cement mixture therein.

And each of the reinforcing member 18 may be configured to be firmly and tightly connected to each other by a fastening member such as a bolt portion or an adhesive member. When the reinforcing members 18 are tightly connected to each other, there is an effect of preventing the groundwater flowing from the building floor surface 1 to penetrate the outside of the reinforcing members 18.

And since the reinforcing member 18 is firmly connected to the cement mixture of the concrete portion 22, the bottom portion 12 by the reinforcing member 18 and the concrete portion 22 has a strong bearing force, the elevator of the present invention Pit lower structure 10 has the advantage that it can more firmly support the upward buoyancy and building loads coming from the floor installation groove (1a).

The locking protrusion 27 is formed to protrude on the bottom portion 12, and a plurality of hooking protrusions 27 may be formed, and the bottom portion 12 and the concrete portion 22 are firmly bound to each other by the locking protrusion 27. It is configured to be.

7 is a view showing another embodiment in which the elevator pit bottom structure of the present invention is installed.

Referring to Figure 7, the elevator pit bottom structure 10 of the present invention is cast concrete layer (not shown) on the flat bottom surface 1, the bottom portion 12, the first concrete portion 20 is placed thereon , A buffer spring 25, a reinforcing member 16, and a second concrete part 21 are provided. At this time, the bottom installation groove (1a) is formed on the top of the bottom surface 1, the bottom portion 12 may be located in the bottom installation groove (1a), depending on the site conditions discarded concrete layer (not shown) This casting may be omitted.

The first concrete portion 20 is formed by pouring a cement mixture on the upper portion of the bottom 12, in this case, the reinforcing member 16 and the cement mixture is firmly connected to each other, the first concrete portion 20 is It becomes stronger. As a result, the bottom portion 12 has a stronger bearing force, so that even if the second depth d '' 'of the floor installation groove 1a is smaller than the conventional depth d' ', the floor installation groove ( It is configured to firmly support the upward hydraulic pressure and building load from 1a), and the space inside the elevator pit is also configured to be firmly supported.

One or more buffer springs 25 are installed above the first concrete part 20.

The second concrete portion 21 is formed by a cement mixture which is poured on the upper portion of the first concrete portion 20, wherein the lower end of the buffer spring 25, the upper end of the reinforcing member 16, and the cement mixture Since it is firmly connected to each other, the shock absorbing spring 25 is firmly positioned above the first concrete portion 20, the shock absorbing spring 25 is configured so that the shock spring 25 is not separated to the outside even in a strong impact such as an elevator.

And the second concrete portion 21 is preferably composed of pressed concrete. That is, by placing the pressing concrete on the upper portion of the first large concrete portion 20, the buffer spring 25 is firmly positioned on the upper portion of the bottom portion 12, the operator works on the flat pressing concrete As a result, the movement is easy and the working environment is improved.

8 is a view showing another embodiment in which the elevator pit bottom structure of the present invention is installed.

Referring to Figure 8, the elevator pit bottom structure 10 of the present invention is configured such that the shape of the reinforcing member 18 in Figure 7 is different.

That is, in the elevator pit lower structure 10 of the present invention, the bottom portion 12 or the bottom portion 12 is positioned above the discarded concrete layer (not shown) having the bottom installation groove 1a, and the bottom portion 12 The mold 14 is located vertically upward from the outside of the. The first concrete part 20, the second concrete part 22, and the shock absorbing spring 25 are formed on the top of the bottom part 12, and the reinforcing member 18 is formed inside the first concrete part 20. It is provided.

It may be formed in any one of a 'shape, and preferably formed in a' H 'shape.

And since the reinforcing member 18 is firmly connected to the cement mixture of the first concrete portion 20, the bottom portion 12 by the reinforcing member 18 and the first concrete portion 20 has a strong bearing strength, Elevator pit bottom structure 10 of the present invention has the advantage that it can more firmly support the upward buoyancy and building loads coming from the floor installation groove (1a).

On the other hand, the side wall 15 may be provided between the outer side of the bottom portion 12 and the mold 14. The side walls 15 are integrally formed vertically upward from the outer side of the bottom portion 12, or each formed in a state separated from each other, and then are mutually coupled. The side wall 15 positioned as described above may provide a space for the worker to work on the upper side of the bottom 12. And the mold 14 is coupled to the top of the side wall 15, by the bottom portion 12, the side wall 15 and the mold 14, the load of the building is supported, while at the same time securing a space for checking the elevator It is configured to be.

As described so far, the elevator pit bottom structure of the present invention has a three-dimensional bottom so as to secure supporting strength and structural strength without complicated reinforcing structures such as ribs. Since the elevator pit undercarriage is easy to manufacture, assemble, install and transport, not only mass production is possible, but also manufacturing cost is reduced, and the effect of advancing air is provided.

In addition, since the shock absorbing spring is firmly positioned on the upper part of the first concrete part by the second concrete part, the shock absorbing spring has an effect of being configured so that the shock absorbing spring does not escape to the outside even by a strong impact by an elevator or the like.

While the invention has been described in detail in the foregoing embodiments, it will be apparent to those skilled in the art that various modifications and variations are possible within the spirit of the invention, and such modifications and variations belong to the appended claims.

Figure 1a is a view showing a case in which the conventional structure is installed on the bottom of the elevator pit.

1B is a view schematically showing a state in which a shock absorbing spring is installed in a conventional structure.

10: bottom structure 12: bottom

14: mold 15: side wall

16, 18: reinforcing member 20: first concrete part

21: second concrete part 22: concrete part

25: shock absorbing spring 27: protrusion

Claims

An elevator pit bottom structure for forming an elevator pit,

A bottom located at the bottom of the elevator pit; And

And a mold coupled upwardly along an outer side of the bottom portion so that a space opened to the center upper side of the bottom portion is formed.

Elevator pit bottom structure, characterized in that it comprises one or more buffer members installed on the top of the bottom.

An elevator pit bottom structure for forming an elevator pit,

A bottom located at the bottom of the elevator pit; And

And a sidewall formed upward along an outer side of the bottom portion so that a space opened to the center upper side of the bottom portion is formed.

An elevator pit bottom structure for forming an elevator pit,

A bottom located at the bottom of the elevator pit; And

It comprises a first concrete portion formed by pouring a cement mixture on the top of the bottom portion, at least one buffer member installed on the upper portion of the first concrete portion, and a second concrete portion formed on the first concrete portion An elevator pit bottom structure, characterized in that.

An elevator pit bottom structure for forming an elevator pit,

A bottom located at the bottom of the elevator pit; And

The method according to claim 1 or 2,

Elevator pit bottom structure, characterized in that it comprises a concrete portion formed by pouring a cement mixture on top of the bottom portion.

The method of claim 5, wherein

The upper portion of the bottom is provided with a plurality of reinforcing members,

And said cement mixture is poured into a space located between each of said reinforcing members of said plurality of reinforcing members.

The method according to claim 3 or 4,

The method of claim 6,

The reinforcement member is an elevator pit bottom structure, characterized in that consisting of a plate-shaped reinforcement rib.

The method of claim 6,

The reinforcing member is in the form of a long beam, the cross section of which is triangular, square, circle, 'H', 'I''c','b' or '

Elevator pit bottom structure, characterized in that formed in any one of the shape.

The method of claim 7, wherein

The method according to claim 3 or 4,

The second concrete portion is formed by pouring cement mixture,

The bottom of the buffer member, the upper end of the reinforcing member and the cement mixture is configured to be firmly connected to each other by the cement mixture, characterized in that the elevator pit bottom structure.

The method according to any one of claims 1 to 4,

The buffer member is an elevator pit bottom structure, characterized in that consisting of a buffer spring.

The method of claim 5, wherein

Elevator concrete bottom structure, characterized in that the concrete portion is composed of pressed concrete.

The method according to claim 3 or 4,

Elevator second bottom structure, characterized in that the second concrete portion is composed of pressed concrete.

The method according to any one of claims 1 to 4,

Elevator pit bottom structure, characterized in that one or more locking projections protruding from the top of the bottom.