DE202019005915U1 - Manhole cover frame, manhole cover assembly and manhole assembly - Google Patents

Abstract

Manhole cover frame (1) for a manhole cover arrangement (80) for use in road construction and in rehabilitation processes, which forms a manhole passage (D) running in a longitudinal direction (L),
- with a locking element receptacle (2), and
- with a frame apron (3) with an inside (4), an outside (5) and a length (X) in the longitudinal direction (L), the shaft passage (D) running through the frame apron (3),
- wherein the frame apron (3) has a first predetermined breaking point (10) that runs transversely to the longitudinal direction (L), and the frame apron (3) has a first section (A1), which adjoins the closure element receptacle (2), and a targeted second section (A2) which can be broken off along the first predetermined breaking point (10) in such a way that the length of the frame apron can be shortened, the first predetermined breaking point (10) running along the circumference of the frame apron (3), characterized in that
A) the manhole cover frame (1) is made of cast iron and the first predetermined breaking point (10) is designed at least in sections as a predetermined breaking groove (11), the frame apron (3) having a wall thickness (W) and the predetermined breaking groove (11) having a groove depth (T1) which is at least 25% of the wall thickness (W) of the frame skirt (3) in the area of the predetermined breaking groove (11); and or
B) the frame apron (3) has at least one second predetermined breaking point (20) which runs transversely to the longitudinal direction (L) and the break-off second section (A2) the frame apron (3) is divided into a first section (A21) that can be broken off in a targeted manner and a further section (A22) that can be broken off in a targeted manner; and or
C) the break-off second section (A2) of the frame apron (3) has at least one segmentation predetermined breaking point (30) running in the longitudinal direction (L) and dividing the second section (A2) in the circumferential direction of the frame apron (3).

Description

The invention relates to a manhole cover frame according to the preamble of claim 1, a manhole cover arrangement according to claim 10 and a manhole arrangement with such a manhole cover arrangement according to claim 11.

Manhole cover arrangements are used to cover manholes and usually have a manhole cover frame and a closure element with which a through-opening in the manhole cover frame can be closed. Such manhole cover frames are installed in particular at the top of a manhole structure. In the case of manholes in traffic areas in particular, it is necessary for the manhole cover frame and the closure element to be installed flush with the floor in the traffic area.

It is problematic in the prior art that the distance between the shaft structure and the traffic area is variable. Provided the contractor has advance knowledge of this distance, he can order a manhole cover assembly that is of a suitable length. However, even in the case of preliminary planning, but in particular also in the case of renovations, it often turns out on the construction site that the installation height of the manhole cover arrangement carried along is too great and would protrude beyond the traffic area in the event of an installation. In practice, construction site activity is then interrupted until a shorter manhole cover assembly arrives. This results in additional costs due to repeated journeys, ordering processes and site security. In addition, traffic on the traffic area is impeded for a longer period of time.

Out of DE 10 2015 106 750 A1 discloses a manhole cover frame for a manhole cover assembly for use in new road construction and rehabilitation processes. This has a frame apron through which a shaft passage runs. The manhole cover frame also has a locking element mount.

In US 6,311,433 B1 a manhole cover is known whose frame apron is designed in two parts. An upper section of the frame skirt has an internal thread with which it is screwed onto a lower section with an external thread.

From EP 0 953 687 A2 describes a device for height adjustment between the manhole cover and the road surface.

EP 2 317 197 A1 specifies a dimensionally stable water pipe that has a sleeve with a metal layer and a plastic layer. This sleeve has predetermined breaking points for cutting to length.

DE 9215759 U1 specifies a manhole cover with a manhole frame and a hinged manhole cover.

DE 10 2006 056 146 A1 discloses an installation body for floor slabs of buildings, which forms a service opening to a pipeline under the floor slab, as described by way of example to a non-return valve. This built-in body has a vertically oriented passage into which an elongate, rectangular attachment element with a connecting piece is inserted. This attachment element is cast into the base plate with the connecting piece (together with the installation body) in such a way that its upper side is flush with the base plate. Because of the different thicknesses of the base plates and the distances between the pipelines lying under the base line, the insertion section can be shortened. For this purpose, the connecting piece has cut-to-length markings on which the connecting piece can be cut according to DE 10 2006 056 146 A1 can be sawed off. Optionally, the connection piece according to DE 10 2006 056 146 A1 additionally has a single cut-to-length mark designed as a predetermined breaking point.

The object of the invention is to provide a manhole cover arrangement, individual parts thereof or procedural instructions with which the aforementioned disadvantages are overcome, so that the installation of the manhole cover arrangement can continue without having to interrupt the construction site activity.

Main features of the invention are set out in the characterizing part of claim 1 and claims 10 and 11. Configurations are the subject of claims 2 to 9 and the description.

The invention relates to a manhole cover frame for a manhole cover arrangement for use in new road construction and in rehabilitation processes, which forms a manhole passage running in a longitudinal direction, with a closure element receptacle, in particular for receiving a closure element of a manhole cover arrangement with which the manhole passage can be closed, and with a frame apron with an inner side , an outer side and a longitudinal length, wherein the shaft passage runs through the frame skirt, the frame skirt having a first predetermined breaking point which runs transverse to the longitudinal direction and the frame skirt into a first Section that adjoins the closure element receptacle and divides a second section that can be broken off in a targeted manner along the first predetermined breaking point, namely in such a way that the length of the frame apron can be shortened, in particular irreversibly by breaking or breaking off, with the first predetermined breaking point running along the circumference of the frame apron. In addition (a) the manhole cover frame is made of cast iron and the first predetermined breaking point is designed at least in sections as a predetermined breaking groove, the frame apron having a wall thickness and the predetermined breaking groove having a groove depth which is at least 25% of the wall thickness of the frame apron in the area of the predetermined breaking groove; and/or (b) the frame apron has at least one second predetermined breaking point, which runs transversely to the longitudinal direction and divides the second section of the frame apron that can be broken off into a first section that can be broken off in a targeted manner and a further section that can be broken off in a targeted manner; and/or (c) the break-off second section of the frame apron has at least one predetermined breaking point for segmentation, which runs in the longitudinal direction and divides the second section in the circumferential direction of the frame apron.

With this manhole cover frame according to the invention, the contractor now has the opportunity to adjust the length of the manhole cover frame by shortening the frame apron on site at the construction site in order to adapt it to the existing road structure without having to leave the construction site for this purpose. Due to the predetermined breaking point, this is also possible with inexpensive and almost always available tools, e.g. a hammer, a spade or a pickaxe. The cutting off is also much faster, more precise and less dangerous than, for example, cutting off with a cut-off grinder. The targeted breaking off leads to an irreversible division of the entire component and is based on a targeted mechanical initiation of crack formation in the area of the predetermined breaking point, with the first section of the manhole cover frame remaining usable alone, in particular because this first section is not damaged.

Due to the fact that the first predetermined breaking point runs along the circumference of the frame apron, the frame apron can be shortened uniformly over the circumference.

In one of the embodiments according to the invention and optionally additionally in the other embodiments, the first predetermined breaking point can be designed at least in sections as a predetermined breaking groove, with the predetermined breaking groove preferably running along the entire circumference of the frame apron. A predetermined breaking groove contributes to a clean breaking edge and is easy to produce. In this way, in particular, damage to the first section is also avoided. In the case of a course over the entire circumference, the rupture edge is also clearly defined over the entire circumference.

Optionally, the predetermined breaking groove is located on the outside of the frame skirt. On the one hand, this contributes to a smooth surface on the inside of the frame apron. On the other hand, an impact with a tool to trigger a predetermined breaking point at the predetermined breaking point on the outside can be carried out easily and precisely.

According to one of the embodiments according to the invention, the frame apron has a wall thickness and the predetermined breaking groove has a groove depth which is at least 25%, and preferably at least 30%, of the wall thickness of the frame apron in the area of the predetermined breaking groove. This can optionally be implemented in the further embodiments according to the invention. The frame apron is thus weakened in this area in relation to the adjacent wall thickness of the frame apron to such an extent that the predetermined breaking point can be produced cleanly along the predetermined breaking groove. It is advantageous if the groove depth is at most 60%, and preferably at most 50%, of the wall thickness of the frame apron in the area of the predetermined breaking groove. In this way, the second section is still comparatively stably connected to the first section of the frame apron and can carry traffic loads even when it is not shortened.

In a special embodiment, the predetermined breaking groove has a rounded groove cross section. Due to the lack of corners in the cross-sectional profile, greater traffic loads can be transferred between the first and second sections without spontaneous material fractures occurring at the predetermined breaking point. In addition, a minimum wall thickness is achieved in the area of the bottom of the groove along a tangent line, along which the predetermined breaking point can be carried out.

According to one of the embodiments according to the invention, the frame apron has at least one second predetermined breaking point, which runs transversely to the longitudinal direction and divides the second section of the frame apron that can be broken off into a first section that can be broken off in a targeted manner and a further section that can be broken off in a targeted manner, in particular in such a way that the length of the frame apron increases in a targeted manner two different values can be shortened, in particular irreversibly by breaking apart or breaking off. This can optionally be implemented in the further embodiments according to the invention. This gives the building contractor a particularly high degree of freedom of adaptation regarding the length of the frame apron. The at least one second predetermined breaking point should be arranged between the first predetermined breaking point and an end of the frame apron facing away from the closure element receptacle.

In an embodiment with at least one such second predetermined breaking point, dimensioning is advantageous according to which the second predetermined breaking point is designed to be weaker than the first predetermined breaking point. As a result, the predetermined breaking point at the second predetermined breaking point can be achieved with a low risk of triggering a predetermined breaking point at the first predetermined breaking point.

The second predetermined breaking point can optionally have the individual optional features of the first predetermined breaking point. Among other things, the second predetermined breaking point can therefore optionally run along the circumference of the frame apron. The second predetermined breaking point can also be designed as a predetermined breaking groove, at least in sections. It is advantageous if the predetermined breaking groove of the second predetermined breaking point is arranged on the outside of the frame apron. With regard to dimensioning, it is preferable that the frame skirt has a wall thickness and the predetermined breaking groove of the second predetermined breaking point has a groove depth that is at least 25%, and preferably at least 30%, of the wall thickness of the frame skirt in the area of the predetermined breaking groove. As an upper limit for the groove depth, it is favorable if the groove depth of the predetermined breaking groove of the second predetermined breaking point is at most 60%, and preferably at most 50%, of the wall thickness of the frame apron in the area of the predetermined breaking groove. Finally, it can optionally be provided that the predetermined breaking groove of the second predetermined breaking point has a round groove cross section. With regard to the advantages of these optional refinements, reference is made to the preceding sections, where they are presented in connection with the first predetermined breaking point.

According to one of the embodiments according to the invention and optionally in addition to the other embodiments according to the invention, the second section of the frame apron that can be broken off has at least one segmentation predetermined breaking point that runs in the longitudinal direction and divides the second section or at least one of its partial sections in the circumferential direction of the frame apron, in particular in this way that the second section can be broken off as an open ring or in peripheral segments, in particular irreversibly by breaking or breaking off. If only a single predetermined breaking point for segmentation is provided, this serves as the beginning of the predetermined breaking point. Depending on how brittle the ring apron is, the entire open ring comes loose or segments are broken off piece by piece.

It is advantageous if the at least one predetermined breaking point for segmentation extends between the first predetermined breaking point and an end of the frame skirt that faces away from the closure element receptacle. In this case, the at least one predetermined breaking point for segmentation can either extend over the entire length of the second section in the longitudinal direction or over the entire length of a partial section of the second section in the longitudinal direction. As a result, the adjoining parts of the second section do not stick to one another when knocked off.

Breaking off or breaking apart is particularly easy if at least two predetermined breaking points for segmentation are arranged distributed over the circumference of the second section, preferably evenly distributed. As a result, the segments can simply be broken off or fracture-separated individually. Furthermore, the entire second section can be separated particularly quickly from the first section if the predetermined breaking points for segmentation are arranged flush across the boundaries of the sections when the second section is divided into at least two sections.

The predetermined breaking points for segmentation preferably each run in a common plane with the longitudinal direction. This means that the longitudinally aligned breaking edges are short when breaking off.

The segmentation predetermined breaking points can optionally have the individual optional features of the first predetermined breaking point. Among other things, the predetermined breaking points for the segmentation can each be designed as a predetermined breaking groove, at least in sections. It is advantageous if the predetermined breaking groove of the segmentation predetermined breaking points is arranged on the outside of the frame apron. With regard to dimensioning, it is preferable that the frame skirt has a wall thickness and the predetermined breaking groove of the segmentation predetermined breaking points each have a groove depth that is at least 25%, and preferably at least 30%, of the wall thickness of the frame skirt in the area of the predetermined breaking groove. As the upper limit of the groove depth, it is favorable if the groove depth of the predetermined breaking groove of the segmentation predetermined breaking points is a maximum of 60%, and preferably a maximum of 50%, of the wall thickness of the frame apron in the area of the predetermined breaking groove. Finally, it can optionally be provided that the predetermined breaking groove of the segmentation predetermined breaking points each have a round groove cross section. With regard to the advantages of these optional refinements, reference is made to the previous sections, where these are represented analogously in connection with the first predetermined breaking point.

Furthermore, it is preferable that the predetermined breaking points for segmentation are designed to be stronger than the first and/or second predetermined breaking point. In particular, the groove depth of the segmentation predetermined breaking points should be less deep than the adjacent predetermined breaking grooves of the first and/or second predetermined breaking point. A crack caused by breaking off or fracture separation will thus preferably continue along the first and/or second predetermined breaking point. A straight demolition edge is achieved in this way.

In a more detailed configuration of the manhole cover frame, provision is also made for the closure element receptacle to be designed in one piece with the frame apron. This is inexpensive to manufacture and high stability is achieved. The manhole cover frame is preferably designed in one piece as such. This can also include a frame collar. This can protrude radially beyond the frame apron. It can also form a traffic area.

A variant in which the frame apron or the manhole cover frame is made of cast iron is particularly stable and at the same time brittle enough to produce a predetermined breaking point. This is the case in one of the embodiments according to the invention and can optionally be implemented in the other embodiments according to the invention.

The invention also relates to a manhole cover arrangement for use in new road construction and in rehabilitation processes, with a manhole cover frame as described above and below, and a closure element, the manhole passage being closable by positioning the closure element on the closure element receptacle. Consequently, not only the manhole cover frame can be leveled by breaking off or fracture separation, but also the closure element.

In addition, the invention also relates to a manhole arrangement with a manhole cover arrangement, as described above and below, and a manhole structure, the manhole cover frame with the frame apron protruding into the shaft structure. With this shaft arrangement, it is possible to adapt the length of the shaft cover frame or its frame apron to the position of the shaft structure relative to the traffic area. The frame apron can dip into a centering ring of the shaft structure. The centering ring preferably forms a guide for the frame apron. The frame apron is preferably mounted in the centering ring so that it can be displaced longitudinally. As a result, the manhole cover frame can be rolled into the road surface and leveled in the process. Such centering rings are used especially when the frame apron has a larger outside diameter than the inside diameter of the manhole structure at its upper end. With such diameter ratios, a collision between the manhole structure and the frame apron can be prevented by breaking off the second section. However, breaking off the second section also makes sense in configurations in which the outer diameter of the frame apron is approximately as large as the inner diameter of the shaft structure. If the frame apron dips deeply into the shaft structure, jamming can occur, particularly in the case of traffic areas that are oriented at an angle to the shaft structure, which in the worst case can lead to damage to the shaft structure. This can be avoided by shortening the frame skirt.

In particular, the shaft structure can form a circular opening for the frame apron. Correspondingly, the frame skirt should also have an essentially cylindrical outer surface. Furthermore, the shaft structure according to the invention preferably consists essentially of concrete. However, the optional centering ring can be made of concrete or metal, e.g. cast iron.

A method of installing a manhole cover frame as described above and below onto a manhole assembly may include the following steps. First, an available installation height for the manhole cover frame between an upper end of the manhole structure and the desired installation height of the closure element receptacle is determined. The manhole cover frame is then installed either without shortening the frame skirt if the available height is greater than a defined limit value, or installed after the frame skirt has been shortened in the longitudinal direction by at least partially breaking off the second section at a predetermined breaking point if the available height is less than the defined limit. The length of the manhole cover arrangement can thus be adjusted quickly and inexpensively on the construction site.

It is particularly advantageous if the breaking off takes place by hitting the second section with a striking tool, in particular with a hammer (eg a mallet). Such are almost always available. Construction workers are also very familiar with the handling of hammers and a Hammer is also almost always carried. A hammer can be quickly obtained as an aid. The predetermined breaking points should therefore be designed for breaking off with a striking tool.

• 1 eine perspektivische Ansicht eines Schachtabdeckungsrahmens mit einer ersten Sollbruchstelle;
• 2 eine perspektivische Ansicht eines Schachtabdeckungsrahmens mit einer ersten Sollbruchstelle und einer einzigen Segmentierungssollbruchstelle;
• 3 eine perspektivische Ansicht eines Schachtabdeckungsrahmens mit einer ersten Sollbruchstelle und mehreren Segmentierungssollbruchstellen;
• 4 einen Längsschnitt durch einen Schachtabdeckungsrahmen, in dem eine erste Sollbruchstelle und eine einzige Segmentierungssollbruchstelle erkennbar sind;
• 5 einen Querschnitt durch einen Schachtabdeckungsrahmen, in dem eine einzige Segmentierungssollbruchstelle erkennbar ist;
• 6 bis 12 eine perspektivische Ansicht des Schachtabdeckungsrahmens nach 1, wobei ein zweiter Abschnitt der Rahmenschürze in der Figurenreihenfolge schrittweise weiter abgebrochen ist;
• 13 eine perspektivische Ansicht eines Schachtabdeckungsrahmens mit einer ersten und einer zweiten Sollbruchstelle;
• 14 eine perspektivische Ansicht eines Schachtabdeckungsrahmens mit einer ersten und einer zweiten Sollbruchstelle sowie einer einzigen Segmentierungssollbruchstelle;
• 15 eine perspektivische Ansicht eines Schachtabdeckungsrahmens mit einer ersten und einer zweiten Sollbruchstelle sowie mehreren Segmentierungssollbruchstellen;
• 16 einen Längsschnitt durch einen Schachtabdeckungsrahmen, in dem eine erste und eine zweite Sollbruchstelle sowie eine Segmentierungssollbruchstelle erkennbar sind; und
• 17 einen Längsschnitt durch einen Schachtaufbau mit einem Schachtabdeckungsrahmen.

Further features, details and advantages of the invention result from the wording of the claims and from the following description of exemplary embodiments with reference to the drawings. Show it:

• 1 a perspective view of a manhole cover frame with a first predetermined breaking point;
• 2 a perspective view of a manhole cover frame with a first predetermined breaking point and a single segmentation predetermined breaking point;
• 3 a perspective view of a manhole cover frame with a first predetermined breaking point and several segmentation predetermined breaking points;
• 4 a longitudinal section through a manhole cover frame, in which a first predetermined breaking point and a single segmentation predetermined breaking point can be seen;
• 5 a cross section through a manhole cover frame in which a single predetermined breaking point for segmentation can be seen;
• 6 until 12 a perspective view of the manhole cover frame 1 , wherein a second section of the frame skirt in the order of the figures is gradually further broken off;
• 13 a perspective view of a manhole cover frame with a first and a second predetermined breaking point;
• 14 a perspective view of a manhole cover frame with a first and a second predetermined breaking point and a single segmentation predetermined breaking point;
• 15 a perspective view of a manhole cover frame with a first and a second predetermined breaking point and a plurality of segmentation predetermined breaking points;
• 16 a longitudinal section through a manhole cover frame, in which a first and a second predetermined breaking point and a segmentation predetermined breaking point can be seen; and
• 17 a longitudinal section through a manhole structure with a manhole cover frame.

The 1 until 3 each show a perspective view of a manhole cover frame 1 for a manhole cover arrangement (80, cf. 17 ) for use in new road construction and rehabilitation processes. This forms a shaft passage D running in a longitudinal direction L. On the upper side, the manhole cover frame 1 has a closure element receptacle 2 for receiving a closure element (81, cf. 17 ) a manhole cover assembly (80, cf. 17 ) with which the shaft passage D can be closed. The closure element receptacle 2 is surrounded radially by a frame collar 6 which forms a traffic surface 7 on the upper side.

In the longitudinal direction L, a tubular frame apron 3 with an inside 4, an outside 5 and a length X in the longitudinal direction L adjoins the closure element receptacle 2 . The frame collar 6 protrudes radially beyond the frame apron 3 . The shaft passage D runs through this frame apron 3 as well as the closure element receptacle 2 and the frame collar 6.

The manhole cover frame 1 is made in one piece from cast iron, in particular including the closure element receptacle 2, the frame collar 6 and the frame apron 3.

Furthermore, one recognizes in the 1 until 3 in each case that the frame apron 3 has a first predetermined breaking point 10, which runs transversely to the longitudinal direction L, and the frame apron 3 is divided into a first section A1, which adjoins the closure element receptacle 2, and a second section A2 that can be broken off. As a result, the length X of the frame apron 3 can be shortened, in particular irreversibly by breaking or breaking off. The first predetermined breaking point 10 is designed as a predetermined breaking groove 11 on the outside 5 of the frame skirt 3 , which runs along the entire circumference of the frame skirt 3 .

In a longitudinal section through the manhole cover frame 1 4 it can be seen that the frame apron 3 has a wall thickness W and the predetermined breaking groove 11 has a groove depth T1 which is at least 25%, and preferably at least 30%, of the wall thickness W of the frame apron 3 in the area of the predetermined breaking groove 11. However, this groove depth T1 should be a maximum of 60%, and preferably a maximum of 50%, of the wall thickness W of the frame apron 3 in the area of the predetermined breaking groove 11 . As can also be seen, the predetermined breaking groove 11 has a rounded groove cross section. The longitudinal section 4 shows in particular a section through a manhole cover frame 1 according to FIG 2 or 3 , which is why reference is made to the description of the further structure of the manhole cover frame 1 .

2 deviates from the execution in this respect 1 that the second section A2 of the frame apron 3 that can be broken off has a single predetermined breaking point 30 for segmentation, which runs in the longitudinal direction L, and divides the second section A2 in the circumferential direction of the frame apron 3, in particular in such a way that the second section A2 is an open ring or in circumferential segments ( S1, S2, S3, S4, S5, S6, cf. 6 until 12 ) can be broken off, in particular irreversibly by breaking or breaking off. Deviating from this are in the execution 3 several predetermined breaking points for segmentation 30 distributed evenly over the circumference of the second section A2.

The segmentation predetermined breaking points 30 after 2 and 3 each extend over the entire length between the first predetermined breaking point 10 and the end of the frame apron 3 that faces away from the closure element receptacle 2 . The segmentation predetermined breaking points 30 each lie in a common plane with the longitudinal direction L or perpendicular to the first predetermined breaking point 10 .

In cross section according to 5 the predetermined breaking groove 31 of the segmentation predetermined breaking points 30 has a groove depth T3 which is at least 25%, and preferably at least 30%, of the wall thickness W of the frame apron 3 in the area of the predetermined breaking groove 31. However, this groove depth T3 of the predetermined breaking groove 31 of the segmentation predetermined breaking points 30 should be at most 60%, and preferably at most 50%, of the wall thickness W of the frame apron 3 in the area of the predetermined breaking groove 31 . The predetermined breaking groove 31 of the segmentation predetermined breaking points 30 also has a round groove cross section. Furthermore, with regard to the marked technical features, reference is made to the description of the 2 , 3 and 4 referred.

In the 6 until 12 is now shown in the picture order, as is the annular second section A2 according to FIG 2 starting from the first predetermined breaking groove 31 in segments by breaking off six circumferential segments S1, S2, S3, S4, S5, S6. The number and length of the segments depends on the execution of the demolition, because starting from the first predetermined breaking groove 31, the open ring of the second section A2 spontaneously breaks into segments when demolishing. When executing after 3 would tend to break off directly at the adjacent predetermined breaking groove 31, so that the circumferential segments would have defined lengths.

The chess cover frames according to the 13 , 14 and 15 essentially correspond in this order to those in the 1 , 2 and 3 are shown, which is why reference is first made to their description. The main difference in each case is that the frame skirt 3 has a second predetermined breaking point 20 which runs transversely to the longitudinal direction L and divides the breakable second section A2 of the frame skirt 3 into a breakable first section A21 and a breakable further section A22. As a result, the length X of the frame apron 3 can be shortened to two different values, in particular irreversibly by breaking off one or both sections A21, A22. The second predetermined breaking point 20 lies between the first predetermined breaking point 10 and the end of the frame apron 3 that faces away from the closure element receptacle 2 .

As can be seen in particular in the longitudinal sectional view of the embodiment according to the 14 or 15 in 16 sees, the second predetermined breaking point 20 is weaker than the first predetermined breaking point 10. The second predetermined breaking point 20 thus breaks more easily than the first predetermined breaking point 10. For this purpose, the second predetermined breaking point 20 is designed as a predetermined breaking groove 21, which is on the outside 5 of the frame apron 3 along the Scope of the frame apron 3 runs. The predetermined breaking groove 21 of the second predetermined breaking point 20 also has a rounded groove cross section. The predetermined breaking groove 21 of the second predetermined breaking point 20 has a groove depth T2 which is at least 25%, and preferably at least 30%, of the wall thickness W of the frame apron 3 in the area of the predetermined breaking groove 21 . The wall thickness W clearly decreases as the distance from the closure element receptacle 2 increases. However, the groove depth T2 of the predetermined breaking groove 21 of the second predetermined breaking point 20 should be at most 60%, and preferably at most 50%, of the wall thickness W of the frame apron 3 in the area of this predetermined breaking groove 11 . Furthermore, one can see that the first predetermined breaking point 10 is slightly weaker than the segmentation predetermined breaking point 30 in the adjacent area. Likewise, the second predetermined breaking point 20 is slightly weaker than the segmentation predetermined breaking point 30 in the adjacent area. This promotes straight crack formation along the first and/or second predetermined breaking point 10, 20.

Furthermore, from the 13 , 14 , 15 and 16 in each case that the at least one segmentation predetermined breaking point 30 extends in the longitudinal direction L over the entire length of the second section A2, thus in alignment over the first and the second section A21, A22.

In 17 12 is a longitudinal section through a duct assembly 90 with a duct cover Cover assembly 80 is shown on a manhole assembly 91.

The manhole cover assembly 80 has a manhole cover frame 1, for example as shown in FIGS 1 until 16 can be designed. A closure element 81 of the manhole cover arrangement 80 is inserted into the closure element receptacle 2 of the manhole cover frame 1 and thereby closes the manhole passage D.

The manhole cover frame 1 faces the manhole structure 91 with the frame apron 3 and, if it were to be completely lowered, would sit on the manhole structure 91 and be supported on this. This is particularly the case because the frame skirt 3 is seated in a longitudinally displaceable manner in a guide of a centering ring 92 of the shaft structure 91, the diameter of which is larger than the actual diameter of the shaft structure 91 at its upper end. The outer diameter of the frame apron 3 is therefore larger than the diameter of the shaft structure 91 below the centering ring 92.

To install the manhole cover frame 1, it can now first be determined how high the available construction height for the manhole cover frame 1 is between the upper end of the manhole structure 91 and the desired installation height of the closure element receptacle 2 or the traffic area 7. The manhole cover frame 1 is then installed either without shortening the frame apron 3 if the available installation height is greater than a defined limit value. Alternatively, installation takes place only after the frame apron 3 has been shortened in the longitudinal direction L by at least partially breaking off the second section A2 at a predetermined breaking point 10, 20 if the available body height is less than the defined limit value. For this purpose, for example, a hammer can be used to hit the outside 5 of the second section A2 (see 1 until 16 ).

The invention is not limited to one of the embodiments described above, but can be modified in many ways.

All of the features and advantages resulting from the claims, the description and the drawing, including structural details, spatial arrangements and method steps, can be essential to the invention both on their own and in a wide variety of combinations.

Reference List

1

manhole cover frame

2

locking element recording

3

frame apron

4

inside

5

outside

6

frame collar

7

traffic area

10

first breaking point

11

breaking groove

20

second breaking point

21

breaking groove

30

segmentation breaking point

31

breaking groove

80

manhole cover assembly

81

closure element

90

shaft arrangement

91

shaft construction

92

centering ring

A1

first section

A2

second part

A21

first section

A22

another section

D

shaft passage

L

longitudinal direction

S1

perimeter segment

S2

perimeter segment

S3

perimeter segment

S4

perimeter segment

S5

perimeter segment

S6

perimeter segment

T1

groove depth

T2

groove depth

T3

groove depth

W

Wall thickness

X

length

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• DE 102015106750 A1 [0004]
• US6311433B1 [0005]
• EP 0953687 A2 [0006]
• EP 2317197 A1 [0007]
• DE 9215759 U1 [0008]
• DE 102006056146 A1 [0009]

Claims (11)

Manhole cover frame (1) for a manhole cover arrangement (80) for use in new road construction and in rehabilitation processes, which forms a manhole passage (D) running in a longitudinal direction (L), - with a closure element receptacle (2), and - with a frame apron (3). an inside (4), an outside (5) and a length (X) in the longitudinal direction (L), the shaft passage (D) running through the frame apron (3), - the frame apron (3) having a first predetermined breaking point (10) which runs transversely to the longitudinal direction (L), and the frame apron (3) is divided into a first section (A1), which adjoins the closure element receptacle (2), and a second section (A2) which can be broken off in a targeted manner along the first predetermined breaking point (10). divided in such a way that the length of the frame apron can be shortened, the first predetermined breaking point (10) running along the circumference of the frame apron (3), characterized in that A) the manhole cover frame (1) is made of cast iron and the first predetermined breaking point (10) is at least is designed in sections as a predetermined breaking groove (11), the frame apron (3) having a wall thickness (W) and the predetermined breaking groove (11) having a groove depth (T1) which is at least 25% of the wall thickness (W) of the frame apron (3) in the area of the predetermined breaking groove (11); and/or B) the frame apron (3) has at least one second predetermined breaking point (20) which runs transversely to the longitudinal direction (L) and divides the second section (A2) of the frame apron (3) that can be broken off in a targeted manner into a first partial section (A21) that can be broken off in a targeted manner and a further section (A22) which can be broken off in a targeted manner; and/or C) the break-off second section (A2) of the frame apron (3) has at least one segmentation predetermined breaking point (30) which runs in the longitudinal direction (L) and divides the second section (A2) in the circumferential direction of the frame apron (3). Manhole cover frame (1). claim 1 , Variants B) and C), characterized in that the first predetermined breaking point (10) is designed at least in sections as a predetermined breaking groove (11). Manhole cover frame (1). claim 1 , Variant A) or claim 2 , characterized in that the predetermined breaking groove (11) is arranged on the outside (5) of the frame skirt (3). Manhole cover frame (1). claim 1 , Variant A) or one of the claims 2 until 3 , characterized in that the predetermined breaking groove (11) has a round groove cross section. Manhole cover frame (1). claim 1 , Variant B), characterized in that the second predetermined breaking point (20) is weaker than the first predetermined breaking point (10). Manhole cover frame (1) according to one of the preceding claims, characterized in that the closure element receptacle (2) is constructed in one piece with the frame apron (3). Manhole cover frame (1) according to one of the preceding claims, characterized in that it is constructed in one piece. Manhole cover frame (1) according to one of the preceding claims, characterized in that it consists of cast iron. Manhole cover frame (1) according to one of the preceding claims, characterized in that the predetermined breaking point (10) is designed for breaking off with a striking tool. Manhole cover arrangement (80) for use in new road construction and in rehabilitation processes, with a manhole cover frame (1) according to one of the preceding claims and a closure element (81), the manhole passage (D) being formed by the positioning of the closure element (81) on the closure element receptacle (2) is lockable. Manhole assembly (90) with a manhole cover assembly (80). claim 10 and a manhole structure (91), the manhole cover frame (1) with the frame apron (3) protruding into the manhole structure (91).

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