DK178237B1

DK178237B1 - Guard Rail

Info

Publication number: DK178237B1
Application number: DK201400247A
Authority: DK
Inventors: John Seitzinger
Original assignee: Seitzinger Aps
Priority date: 2014-05-05
Filing date: 2014-05-05
Publication date: 2015-09-14
Also published as: DK201400247A

Abstract

A guard rail (2) comprising one or more sections (S1, S2, S3) is disclosed. The guard rail (2) comprising one or more sections (S1, S2,S3) each comprising at least two substantially vertically extending rod members (30, 30', 30'') and one or more railing members (50, 50', 52, 52', 54, 54') mechanically attached to the at least two rod members (30, 30', 30''). The guard rail (2) comprises means (30, 30', 30'') for being mechanically attached to corresponding base members (20, 20', 20'') attached to the periphery (10) of a wall of a well (4).

Description

Guard Rail Field of invention

The present invention generally relates to a guard rail and a guard rail system for preventing access to a well and securing the safety of service personal working with a well. The present invention more particularly relates to a guard rail and a guard rail system for a well e.g. a wastewater pumping station.

Prior art

Today, several persons are required when service of a wastewater pumping station (e.g. service of a wastewater pump) or another well has to be carried out. Two persons are required in order to carry out service due to safety requirement (in case that one of the service personnel should accidently fall into the well.

Therefore, service of wells including wastewater pumping stations is time consuming and expensive. Several attempts have been made to provide guard rails suitable for securing the safety of service personnel doing service of wells including wastewater pumping stations. These solutions provide a guard rail that is not strong enough to prevent person from falling into the well by accident or that needs to be kept within the well. When a guard rail is arranged within a well, the hydrogen sulphide within a wastewater pumping station will damage the guard rail over time.

US 3444793 A discloses a manhole guardrail for use with a hollow cylindrical manhole extension that can be removably secured inside the ring bordering a manhole. The guardrail comprises up-standing barrier sections hingedly interconnected to form a fence of a length capable of partially enclosing the extension. The guiderail comprises shield-engaging brackets formed to engage the cylindrical outer surface of the manhole shield to hold the guardrail in place. This way of holding the guardrail in place is, however, not sufficiently safe.

US 2009236180 A1 discloses a manhole construction safety and work platform device having a scaffold catwalk for working on a manhole, providing the safety and work platform with adjustable braces engaging the side of a conical manhole casing. The inner perimeter of the device circumferentially defines a central access opening in order to slidably accept, receive, and fit around the conical section of the manhole casing, as typically used in the utility construction industry. The suggested way of holding the safety and work platform device in place is not sufficiently safe.

Therefore, it would be desirable to provide an improved guard rail suitable for securing the safety of service personnel doing service of a well (e.g. a wastewater pumping station).

Accordingly, it is an object of the present invention to provide a guard rail suitable for securing the safety of service personnel doing service of a well including a wastewater pumping station.

It is also an object of the present invention to provide a guard rail that is easy and fast to apply.

Summary of the invention

The object of the present invention can be achieved by a guard rail defined in claim 1 and by a guard rail system as defined in claim 10. Preferred embodiments are defined in the dependent sub claims and explained in the following description and illustrated in the accompanying drawings.

The guard rail according to the invention is a guard rail comprising one or more sections each comprising at least two substantially vertically extending rod members and one or more railing members mechanically attached to the at least two rod members, wherein the rod members can be mechanically attached to corresponding base members attached to the periphery of a wall of a well, wherein the rod members are configured to be attached to the base members by mechanically inserting the rod members into tube-shaped receiving members (e.g. cylindrical receiving members) of the base members.

The term well is understood as any type of well and any type of manhole.

Hereby it is possible to provide a guard rail suitable for securing the safety of service personnel doing service of a well (e.g. a wastewater pumping station) simply by attaching the guard rail to the corresponding base members attached to the periphery of a wall of a well. Accordingly, the required strength of attachment and support can be achieved.

Moreover, by the guard according to the invention it is possibly provide a guard rail that is easy and fast to apply.

The guard rail may be made in any suitable materials such as metal (e.g. aluminum), plastic (e.g. glass fiber reinforced plastic) or wood.

The guard rail may comprise one, two, three or more sections each comprising at least two substantially vertically extending rod members. Hereby the rod members are configured to transfer a vertical directed load downwards in an efficient manner. Moreover, the stability of the guard rail may be increased by applying vertically extending rod members.

The rod members may have any suitable shape. The rod members may be hollow (tube-shaped) or be massive. The cross section of the rod member may be circular, oval, rectangular (e.g. square), hexagonal, octagonal or have any other desired cross section.

The one or more railing members are mechanically attached to the at least two rod members. Any suitable mechanical attachment means may be applied. However, it is preferred that a quick and time-saving attachment mechanism is applied.

The guard rail comprises rod members that can be mechanically attached to corresponding base members attached to the periphery of a wall of a manhole or a well. It is preferred that the rod members that can be mechanically attached to corresponding base members are easy and fast to use.

The base members comprise a tube-shaped receiving member (e.g. a cylindrical receiving member) and that the rod members of the guard rail comprise a member (e.g. a cylindrical) configured to be attached to the base members by mechanically inserting the member into the receiving member.

It may be an advantage that the base members attached to the outside of the periphery of a wall of a manhole or a well.

Hereby the base members are not damaged by the aggressive hydrogen sulphide (e.g. within a wastewater pumping station) that will damage the guard rail over time. Moreover, the guard rail can easily be attached to the base members when they are attached to the outside of the periphery of a wall of a manhole or a well.

It may be beneficial that each of the at least one section of the guard rail comprises two or more railing members being or comprising means for being mechanically attached to the at least two rod members by means of at least two connection members extending basically perpendicular on the railing members and that the rod members comprise means for receiving said at least two connection member.

Hereby it is possible to assemble the guard rail from segments in a fast and easy manner.

It may be advantageous that each railing member and/or each rod member is a one-piece body.

Hereby it is possible to disassemble the guard rail and transport it without requiring a lot of space. The guard rail may be disassembled into a plurality of small pieces that easily can be stored and transported in a carrier bag.

It may be beneficial that the guard rail comprises at least two sections. Hereby it is possible to provide a guard rail that extends along a greater portion of the manhole or the well.

It may be advantageous that a connection member is provided in the distal end of the railing member.

Hereby it is possible to apply the guard rail to bear against an access cover of a manhole or a well.

It may be an advantage that at least some of the rod members comprise one or more receiving member attached to and being positioned in such a manner that two different railing members can be rotated along the longitudinal axis of the rod members.

It may be beneficial that the railing members comprise a body member and that an extension arm slidably attached to the body member.

Hereby it is possible to use the same guard rail to wastewater pumping stations of different size (the diameter of the access cover).

It may be an advantage that the body member is provided with a canal, and that an extension arm is at least partly arranged within the canal.

Hereby it is possible to provide a reliable and user-friendly way of changing the size of the railing member.

The canal may be cylindrical and may have a circular cross-section by way of example. It is preferred that the geometry of the canal is configured to receive and thus essentially has the same cross-section as the extension arm.

It may be advantageous that the guard rail comprises locking means for maintaining the extension arm in a fixed position relative to the body member.

Hereby it is possible to lock the extension arm in a fixed position relative to the body member.

It may be an advantage that a base member comprises a receiving member essentially shaped as a pipe (e.g. a cylindrical pipe) and that locking profile for receiving a corresponding protruding member is provided in the receiving member.

The objects of the invention may be achieved by a guard rail system comprising a guard rail according to one of the preceding claims, wherein the guard rail system comprises a plurality of base members comprising means for receiving the rod members and that the base members are attached to the periphery of a wall of a manhole or a well.

It may be an advantage that the members are attached to the periphery of a wall of a manhole or a well by mechanical attachment means e.g. by means of bolts and corresponding nuts.

Hereby it is possible to provide an easy mountable guard rail system.

Description of the Drawings

The invention will become more fully understood from the detailed description given herein below. The accompanying drawings are given by way of illustration only, and thus, they are not limitative of the present invention. In the accompanying drawings:

Fig. 1 a) schematically shows a perspective views of a prior art wastewater pumping station;

Fig. 1 b) schematically shows another perspective view of the wastewater pumping station shown in Fig. 1 a);

Fig. 2 a) schematically shows a top view of a base member according to the invention;

Fig. 2 b) schematically shows a perspective view of the base member shown in Fig. 2 a);

Fig. 2 c) shows a top view of a rod member according to the invention;

Fig. 2 d) schematically shows a perspective view of the base member shown in Fig. 2 a) and in Fig, 2 b);

Fig. 2 e) schematically shows how a rod member is inserted into a base member;

Fig. 2 f) schematically shows how a rod member is rotated to provide the rod member into a locked position within the base member;

Fig. 2 g) schematically shows how a rod member is provided in its final position within the base member;

Fig. 3 a) schematically shows a perspective view of a guard rail and a guard rail system according to the invention;

Fig. 3 b) shows a top view of a connection member according to the invention;

Fig. 3 c) shows a top view of two separated connection members according to the invention;

Fig. 3 d) shows a top view of two connection members according to the invention brought together;

Fig. 4 a) schematically shows a perspective view of a guard rail and a guard rail system according to the invention being mounted on a wastewater pumping station;

Fig. 4 b) schematically illustrates a top view of a wastewater pumping station in which a guard rail system comprising a guard rail corresponding to the one illustrated in Fig. 4 a) is installed;

Fig. 4 c) shows a perspective view of a connection member having a semi-circular cross-section;

Fig. 5 a) schematically illustrates a top view of a wastewater pumping station in which a guard rail system comprising one embodiment of a guard rail corresponding to the invention is mounted;

Fig. 5 b) shows a the rod member comprising a cylindrical pipeshaped receiving members arranged adjacent to the rod member;

Fig. 5 c) shows a rod member comprising cylindrical pipe-shaped receiving members arranged in a distance from the rod member;

Fig. 5 d) shows a rod member comprising a cylindrical pipe-shaped receiving members arranged adjacent to the rod member;

Fig. 6 a) illustrates a close-up cross-sectional view of the periphery of the wall of a wastewater pumping station and

Fig. 6 b) illustrates a cross-sectional view of one embodiment of a railing member of a guard rail of the invention.

Detailed description of the invention

Referring now in detail to the drawings for the purpose of illustrating preferred embodiments of the present invention, different views of a prior art wastewater pumping station 4 is illustrated in Fig. 1.

Fig. 1 a) and Fig. 1 b) schematically illustrates two different perspective views of a prior art wastewater pumping station 4. Three base members 20, 20', 20" have been attached to the periphery 10 of the wall of the wastewater pumping station 4.

The wastewater pumping station 4 comprises a two-piece grate 8, 8' comprising a first (semicircle-shaped) grate 8 and a second (semicircleshaped) grate 8' rotably attached to the wall of the wastewater pumping station 4. The wastewater pumping station 4 moreover comprises a two-piece grate access cover 6, 6' comprising a first (semicircle-shaped) access cover portion 6 and a second (semicircleshaped) access cover portion 6' rotably attached to the wall of the wastewater pumping station 4. A handle 12 is attached to the outer surface of the second access cover portion 6'. Hereby it is easier to get hold on and open the second access cover portion 6'.

While each of the access cover portions 6, 6' are locked (held in the shown position) by means of a corresponding rod-shaped locking member 14, 14' bearing against the second grate 8', the first grate 8 is held in position by means of another rod-shaped locking member 14".

The periphery 10 of the wall of the wastewater pumping station 4 is shaped as a circular ring. A large opening 16 is provided in the wastewater pumping station 4 when the grate 8 has been opened like illustrated in Fig. 1 a) and Fig. 1 b). Accordingly, normally two persons are required in order to carry out service of a wastewater pumping station 4 like the one shown in Fig. 1 a) and in Fig. 1 b) due to safety requirement (in case that one of the service personnel should accidently fall into the well of the wastewater pumping station 4.

The invention, however, provides a solution to this problem. The three base members 20, 20', 20" attached to the periphery 10 are configured to receive corresponding members of a guard rail according to the invention.

Fig. 2 a) schematically illustrates a cross-sectional view of a base member 20 of a guard rail system according to the invention. The base member 20 comprises a basically plane plate member 22. The plate member 22 may, however, if desired be shaped in order to fit to the periphery 10 of the wall member that it is intended to be attached onto.

The base member 20 moreover comprises a centrally arranged receiving member 18. The receiving member 18 is essentially shaped as a cylindrical pipe, however, a thin locking profile 36 (for receiving a corresponding protruding member 32) is provided in the receiving member 18. It would be possible to provide a receiving member 18 shaped as a cylindrical pipe without such a locking profile 36. Moreover, the locking profile 36 may be provided elsewhere in the receiving member 18.

The plate member 22 is attached to the periphery 10 of the wall member of a wastewater pumping station by means of threaded rods 24 of bolts 34. The threaded rods 24 extend within a plurality of through-going holes in the periphery 10 of the wall member. A washer 28 is sandwiched between a nut 26 and the periphery 10 of the wall member.

The plate member 22 may be attached to the periphery 10 of the wall member by other means, e.g. by means of detachably attachment members such as clamping means (e.g. hose clamps), magnets or any other suitable type of attachment means.

A rod member 30 having a circular cross-section has been inserted into the receiving member 18. The rod member 30 is provided with a protruding member 32 protruding from the outer periphery of the rod member 30.

Fig. 2 b) illustrates a perspective view of the base member 20 shown in Fig. 2 a). The base member 20 comprises a plate member 22 of same height as the receiving member 18. Moreover, the thickness of the plate member 22 basically corresponds to the thickness of the wall of the receiving member 18.

Two parallel rows of bolts 34 extend through corresponding through-holes provided in the plate member 22. One row is symmetrically provided on each side of the receiving member 18.

Fig. 2 c) illustrates a top view of the rod member 30 having been inserted into the receiving member 18 in Fig. 2 a). The rod member 30 has a circular cross-section and is provided with a protruding member 32 protruding from the outer periphery of the rod member 30.

Fig. 2 d) illustrates another perspective view of the base member 20 shown in Fig. 2 a). It can be seen that the base member 20 comprises through-going holes 38 corresponding to bolts 34 shown in Fig. 2 b). Moreover, it can be seen that the locking profile 36 comprises a first (vertically extending) portion A, a second (horizontally extending) portion B and a third (vertically extending) portion C.

Fig. 2 e), Fig. 2 f) and Fig. 2 g) illustrates three perspective views of the base member 20 shown in Fig. 2 c).

In Fig. 2 e) the rod member 30 is moved downwards along the downward direction 40 indicated with an arrow. Thus, the protruding member 32 is guided along the first portion A of the locking profile 36.

In Fig. 2 f) the rod member 30 is rotated about the longitudinal axis Y in the rotational direction 42 indicated with the arced arrow. Accordingly, the protruding member 32 is guided horizontally along the second portion B of the locking profile 36.

In Fig. 2 g) the rod member 30 is moved downwards along the downward direction 40 indicated with the arrow. Consequently, the protruding member 32 is guided along the third portion C of the locking profile 36.

When the rod member 30 has been brought into this position the rod member 30 cannot be removed merely by applying a vertically directed force. Accordingly, the protruding member 32 together with the locking profile constitute a safety mechanism preventing unintendedly removal of rod members 30 that are attached to a base member 20.

Fig. 3 a) schematically illustrates a guard rail 2 and a guard rail system according to the invention. The guard rail system 70 comprises a guard rail 2 and a plurality of corresponding base members 20, 20', 20" configured to receive the guard rail 2.

The guard rail 2 comprises three rod members 30, 30', 30" each comprising an elongated body member having a circular cross-section. The rod members 30, 30', 30" are made out of cylindrical pipes (e.g. of plastic or extruded aluminium). A pipe-shaped receiving member 44 is provided at the central portion of each of the rod members 30, 30', 30".

The top portion of each rod members 30, 30', 30" constitutes a receiving member adapted to receive cylindrical connection members of one of a railing member 50, 50', 52, 52'. Accordingly, the top portion of each rod members 30, 30', 30" as well as the pipe-shaped receiving member 44 provided at the central portion of each of the rod members 30, 30', 30" are configured to receive a corresponding connection member 46, 46', 48 of a railing member 50, 50', 52, 52'.

In this way it is quick and easy to assembly the guard rail 2 according to the invention. It may be an advantage to mark the rod members 30, 30', 30" with the following markings: "Left", "Right" and "Middle" (or just: L, R and M) so the right rod members 30, 30', 30" can be positioned in the corresponding base members 20, 20', 20".

The receiving members 44 may be attached to the rod members 30, 30', 30" by any suitable means e.g. welding, mechanical attachment by means of screws or bolts. The receiving members 44 may be detachably attached to the rod members 30, 30', 30" e.g. by means of a press-fit connection or mechanism.

The rod members 30, 30', 30" are configured to be vertically arranged when mounted in the corresponding receiving members 18 of the base members 20, 20', 20". The bottom portion of the rod members 30, 30', 30" are adapted to be received by and be contained in the receiving members 18 of the corresponding base members 20, 20', 20".

The guard rail 2 comprises four railing members 50, 50', 52, 52' each comprising an elongated body member 56 having a circular cross-section. The body members 56 may have any other suitable cross section. It may be rectangular (e.g. square), hexagonal, octagonal or have any other desired cross section.

The body members 56 may be made out of (e.g. cylindrical) pipes or of massive rods (e.g. of plastic or extruded aluminium). A cylindrical connection member 48 is provided in the first (distal) end of the body members 56. The connection member 48 is configured to be arranged in a receiving member 44 or in the top portion of the rod member 30.

In the second (proximal) end of the body members 56 a connection member 46' having a semi-circular cross-section is provided. In this manner two adjacent connection members 46' may be arranged within the same receiving member 44 (provided that the receiving member 44 has an inner space configured to receive both connection members 46'. This can be achieved by applying a receiving member 44 having a cylindrical shape like the one shown in Fig. 3 a).

Between the two outermost connection members 46', 48 a massive cylindrical connection members 46 having a circular cross-section is provided. The connection members 46, 46', 48 extend perpendicular to the body member 56.

Accordingly, the connection members 46, 46', 48 are configured to be mounted within a corresponding receiving member 44 (and the top portion of the rod members 30, 30', 30") simply by moving the railing members 50, 50', 52, 52' downwardly like indicated with the bold arrows.

The guard rail 2 comprises a first section Si and a second section S2. The first section Si comprises the first rod member 30, the second rod member 30' and the railing members 50, 50'. The second section S2 comprises the second rod member 30', the third rod member 30" and the railing members 52, 52'.

The connection member 46, 48 may be applied when mounting the guard rail 2 to wells of different diameter. The outermost connection member 48 is used to large wells, whereas the connection member 46 may be used when the guard rail 2 is mounted on wells of smaller size (diameter). It is possible to provide a railing member 50, 50', 52, 52' with only two connection members (thus omitting one of the connection members 48, 46).

The base members 20, 20', 20" corresponds to the ones described with reference to Fig. 1 and Fig. 2.

Fig. 3 b) illustrates a top view of the massive connection member 46. It can be seen that it has a circular cross section.

Fig. 3 c) illustrates a top view of the massive connection members 46' of the adjacent railing members 50, 52. It can be seen that each of the connection members 46' has a semi-circular cross section.

Fig. 3 d) illustrates a top view of the massive connection members 46' of the adjacent railing members 50, 52 in a configuration in which the connection members 46' have been brought together and have been mounted in a corresponding receiving member 44 of the rod member 30'.

It can be seen that a gap G is provided between the connection members 46' and the inside surface of the receiving member 44. In principle this gap G should be small, however, in order to be able to assemble and disassemble the guard rail 2 and the guard system 70 according to the invention, a certain "gap size" (e.g. in the range of 0,1-5 mm) is required. If the connection members 46' and the receiving member 44 are made in different materials (e.g. aluminium and fiber reinforced plastic) a larger gap G may be required due to differences in the material's coefficient of thermal expansion.

Fig. 4 a) schematically illustrates a perspective view of an open wastewater pumping station 4 in an open state. The wastewater pumping station 4 corresponds to the one illustrated in Fig. 1 a) and Fig. 1 b).

A guard rail system 70 comprising a guard rail 2 according to the invention is being mounted on three base members 20, 20', 20" that are attached to the periphery 10 of the wall of the wastewater pumping station 4. Each base member 20, 20', 20" comprises a receiving member 18 corresponding to the one explained with reference to Fig. 2.

A first rod member 30 has been mounted in the receiving member 18 of the first base member 20. A second rod member 30' has been mounted in the receiving member 18 of the second base member 20' and a third rod member 30" has been mounted in the receiving member 18 of the third base member 20".

A railing member 50 is arranged above the first rod member 30 and the second rod member 30'. The railing member 50 is ready to be attached to the first rod member 30 and the second rod member 30' either by inserting the connection member 46, 46' into the corresponding receiving members 44 or by inserting the connection member 46, 46' into the openings in the top portion of the first rod member 30 and the second rod member 30'.

As indicated in Fig. 4 c) the connection member 46' has a semi-circular cross-section and is configured to be inserted through the opening 58 in the top portion of the second rod member 30'.

Fig. 4 b) schematically illustrates a top view of a wastewater pumping station 4 in which a guard rail system 70 comprising a guard rail 2 corresponding to the one illustrated in Fig. 4 a) is installed. The guard rail 2 comprises a first section Si and a second section S2. Base members are attached to the periphery 10 of the wall of the wastewater pumping station 4.

The first section Si comprises a rail member 50 having a length U. The second section S2 comprises a rail member 52 having the same length Li as the rail member 50 in the first section Si. The angle a between the rail member 50 of the first section Si and the rail member 52 of the second section S2 is indicated in Fig. 4 b).

Fig 5 a) schematically illustrates a top view of a wastewater pumping station 4 in which a guard rail system 70 comprising one embodiment of a guard rail 2 corresponding to the invention is mounted. The guard rail 2 comprises a first section Si, a second section Si and a third section S3. Base members are attached to the periphery 10 of the wall of the wastewater pumping station 4.

The first section Si comprises a rail member 50 having a length L2. The second section Si comprises a rail member 52 having the same length l_2, while the third section S3 comprises a rail member 40 having a length L2 corresponding to the length of the rail member 50 of the first section Si and to the length of the rail member 52 the second section S2. Accordingly, it is possible to apply rail members 50, 52, 54 of equal size in all three segments Si, S2, S3.

The angle β between the rail member 50 of the first section Si and the rail member 52 of the second section S2 is indicated in Fig. 5 a). It can be seen that the angle β between the rail member 52 of the second section S2 and the rail member 54 of the third section S3 corresponds to the angle between the rail member 50 of the first section Si and the rail member 52 of the second section S2.

It is possible to have a guard rail system 70 comprising a guard rail 2 comprising four or more sections Si, S2, S3. Moreover, the guard rail system 70 may comprise several guard rails 2 that not are interconnected. In this way, it is possible to guard different areas of a wall of the wastewater pumping station 4 by means of several separate guard rails 2.

Fig. 5 b, Fig. 5 c) and Fig. 5 d) illustrates schematic perspective views of different embodiments of a rod member 30 according to the invention.

In Fig. 5 b) the rod member 30 comprises cylindrical pipe-shaped receiving members 44 arranged adjacent to the rod member 30.

The rod member 30 shown in Fig. 5 c) comprises cylindrical pipeshaped receiving members 44 arranged in a distance from the rod member 30. The cylindrical pipe-shaped receiving members 44 extend parallel to the rod member 30.

The rod member 30 shown in Fig. 5 d) comprises cylindrical pipeshaped receiving members 44 attached to the rod member 30. The cylindrical pipe-shaped receiving members 44 extend parallel to the rod member 30.

By applying receiving members 44 attached to the rod member 30 in a manner as illustrated in Fig. 5 b) Fig. 5 c) and Fig. 5 d) it is possible to use the same rod member 30 to build guard rails of different configurations (like shown in Fig. 4 b) and in Fig. 5 a). By applying receiving members 44 that are spaced from each other it is possible to rotate the rail members 50, 52, 54 in order to achieve the needed angles α, β between adjacent rail members 50, 52, 54.

Fig. 6 a) illustrates a close-up cross-sectional view of the periphery 10 of the wall of the wastewater pumping station. The wastewater pumping station comprises an opening 16 and wall portion protruding above the level of the ground 68.

A base member 20 corresponding to the one illustrated in Fig. 2, Fig. 3 and Fig. 4 is attached to the periphery 10 of the wall of the wastewater pumping station by means of bolts 34 comprising threaded rods 24 extending through through-bores provided in the periphery 10 of the wall of the wastewater pumping station. On the inside of the periphery 10 of the wall of the wastewater pumping station washers 28 and nuts 26 are applied to firmly attach the plate member 22 of the base member 20 to the periphery 10 of the wall of the wastewater pumping station.

The base member 20 comprises a receiving member 18 configured to receive a rod member 30 provided with a protruding member 32 protruding from the outer surface of the rod member 30.

Fig. 6 b) illustrates a cross-sectional view of one embodiment of a railing member 50 of a guard rail of the invention. The railing member 50 comprises a hollow cylindrical body member 56 having a longitudinal axis X. In first (proximal) end of the railing member 50 a massive connection member 46' is provided. The connection member 46' extends perpendicular to the longitudinal axis X of the body member 56.

In the second (distal) end of the railing member 50 a massive connection member 48 is provided. Like the connection member 46', the connection member 48 extends perpendicular to the longitudinal axis X of the body member 56.

A massive connection member 46 is arranged between the massive connection member 48 and the connection member 46'. The connection member 46 also extends perpendicular to the longitudinal axis X of the body member 56.

A massive extension arm 60 is slidably attached to the railing member 50. The massive extension arm 60 is arranged within the centrally arranged cylindrical canal of the body member 56 of the railing member 50. A plurality of through-holes 64 are provided in the extension arm 60. The through-holes 64 extend perpendicular to the longitudinal axis of the extension arm 60.

A locking member 66 has been inserted through one of these through-holes 64 provided in the extension arm 60. The locking member 66 has been inserted through a through-hole provided in the body member 56 of the railing member 50.

It is possible to remove the locking member 66 and slide the extension arm 60 along the longitudinal axis X of the body member 56 in order to adjust the length of that portion of the extension arm 60 that protrudes from the distal end of the railing member 50.

When the extension arm 60 has been placed in the desired position, the locking member 66 may be inserted into the through-hole provided in the body member 56 of the railing member 50 and further through one of the through-holes 64 provided in the extension arm 60.

In this manner it is possible to use the same guard rail to wastewater pumping stations of different size (the diameter of the access cover).

List of reference numerals 2 Guard rail 4 Well (e.g. waste water pumping station) 6, 6' Access cover 8, 8' Grate 10 Periphery 12 Handle 14, 14', 14" Locking member 16 Opening 18, 18', 18" Receiving member 20, 20', 20" Base member 22 Plate member 24 Threaded rod 26 Nut 28 Washer 30, 30', 30" Rod member 32 Protruding member 34 Bolt or nut 36 Locking profile 38 Through-going hole 40 Downward direction 42 Rotational direction 44 Receiving member 46, 46' Connection member 48 Connection member 50, 50' Railing member 52, 52' Railing member 54, 54' Railing member 56 Body member 58 Opening

Li, Li Length α, β Angle 60 Extension arm 62 Contact member 64 Through-holes 66 Locking member 68 Ground 70 Guard rail system X, Y Longitudinal axis A First portion B Second portion C Third portion 51 First section 52 Second section 53 Third section G Gap

Claims

A safety railing (2) comprising one or more sections (Si, S2, S3), each section comprising at least two rod elements (30, 30 ', 30 "), said rod elements extending vertically and one or more railing elements (50, 50 ', 52, 52', 54, 54 '), which railing elements are mechanically attached to at least two rod elements (30, 30', 30 "), characterized in that the rod elements (30, 30 ', 30" ) may be mechanically fixed to corresponding base members (20, 20 ', 20 ") which may be secured to the periphery (10) by a wall of a well (4) and the rod members (30, 30', 30") being designed to being attached to the base members (20, 20 ', 20 ") by mechanically inserting the rod members (30, 30', 30") into tubular receiving members (18, 18 ', 18 ") on the base members (20, 20', 20") ).

A safety railing (2) according to claim 1, characterized in that the base elements (20, 20 ', 20 ") are mounted on the outside of the periphery (10) of a wall of a well (4).

A security railing (2) according to claim 1 or claim 2, characterized in that each of at least one of the sections (Si, S2, S3) of the security railing (2) comprises two or more railing elements (50, 50 ', 52, 52'). 54, 54 '), which may be or comprise a device for mechanical attachment to the at least two rod elements (30, 30', 30 ") by means of at least two connecting elements (46, 46 '), which connecting elements extend therein. substantially perpendicular to the railing elements (50, 50 ', 52, 52', 54, 54 ') and the rod elements (30, 30', 30 ") comprising a device (44) for connecting said at least two connecting elements (46, 46 ').

A safety railing (2) according to claim 3, characterized in that each rod element (30, 30 ', 30 ") and / or each railing element (50, 50', 52, 52 ', 54, 54') is formed in one piece.

A security railing (2) according to one of the preceding claims, characterized in that the security railing (2) comprises at least two sections (Si, S2).

A security railing (2) according to one of the preceding claims, characterized in that a connecting element (48) is provided at the distal end of the railing element (50, 50 ', 52, 52', 54, 54 ').

A safety railing (2) according to one of the preceding claims, characterized in that the railing elements (50, 50 ', 52, 52', 54, 54 ') comprise a base element (56) and an extension arm (60) slidably attached to the base element. (56).

A safety railing (2) according to one of the preceding claims, characterized in that the base element (56) contains a channel and that the extension arm (60) is at least partially located within the channel.

A safety railing (2) according to claim 7 or claim 8, characterized in that the safety railing (2) comprises locking devices (64, 66) for holding the extension arm (60) in a locked position relative to the base element (56).

A safety railing system (70) comprising a safety railing (2) according to one of the preceding claims, wherein the safety railing system (70) comprises a plurality of base elements (20, 20 ', 20 ") comprising devices (18) for receiving the rod elements (30). , 30 ', 30 "), and the base members (20, 20', 20") are attached to the periphery (10) of the wall of a well (4).