DE102015102803A1 - Manhole cover assembly and method of installation - Google Patents

Abstract

The invention relates to a manhole cover arrangement and an installation method thereof for use in new road construction and renovation methods, with a closure element and a manhole cover frame, wherein the manhole cover frame is formed in two parts from a closure receptacle for receiving the closure element and a concrete support body, wherein the concrete support body and the closure receptacle at least in sections positively and materially connected to each other, the closure receptacle projects beyond the concrete support body in the direction of the closure element, and the concrete support body has a downwardly tapering shaft facing away side surface. In this case, the closure receptacle on the side facing away from the shaft of the manhole cover arrangement on a downwardly angled leg, which at least partially comprises the concrete support body on the side facing away from the shaft.

Description

The invention relates to a manhole cover arrangement according to the preamble of claim 1 and to a method for installing such according to claim 11.

The prior art already includes methods for rehabilitating a shaft, wherein a manhole cover arrangement is milled with an oblique milling edge. Subsequently, the manhole cover assembly is removed and a new manhole cover assembly inserted into the free-milled opening with the oblique cutting edges. Optionally, a grout is introduced into the installation opening prior to insertion of the manhole cover assembly to compensate for the height differences.

A disadvantage of this method, however, is that the traffic loads placed on the manhole cover, e.g. be applied by vehicles, be passed on in too large an extent on the underlying shaft. Although a partial relief of the shaft is achieved by the conical cutout and the conical design of the selected manhole cover frame, this is often not sufficient for large traffic loads.

Another disadvantage of the method disclosed therein is the lack of backfilling a gap. Especially for very different materials such. Cast iron, or concrete attached to the cast iron, there is no dampening function or compensatory function with respect to the free-milled oblique milling edge.

To counter this, the beats DE 10 2006 056 936 A1 a method for installing a manhole cover consisting of a manhole cover frame and a lid, above a shaft comprising the following steps: To accommodate the manhole cover frame, a mounting hole is first milled conical by means of a shaft milling machine. Subsequently, the installation opening is cleared. A manhole cover frame is centrally inserted and aligned with the mounting hole in this. The space left between the installation opening and the manhole cover frame is filled with a binding filling material and the area of the concrete part of the frame with asphalt above the manhole cover.

A disadvantage of this embodiment, however, is that the connection of the asphalt in the concrete body of the manhole cover is often insufficient. This is particularly due to the high traffic loads, which act on the then only thinly applied asphalt on the building. In order to defuse this surface layer problem, thickness changes of all types have already been made in the prior art, but these did not lead to the desired result.

Another disadvantage of in DE 10 2006 056 936 A1 The solution shown is also the high material usage during installation, which results from the formation of two joints. The execution of two joints results on the one hand from the connection of the thinly applied asphalt with the manhole cover and the connection of the thinly applied asphalt with the existing road structure. The production at two different points in the road level also leads to an extended installation time.

Due to the only thin overlap in the area between the manhole cover and the road construction, the use of open-pored asphalt, as it should regularly be used in the inner-city installation situation, was not feasible, because open-pored asphalt has only a low load capacity.

The object of the invention is to provide a manhole cover assembly for use in road construction and rehabilitation processes, as well as to provide a method of installing a manhole cover frame according to the invention, thereby precluding connection problems and associated cracking between manhole cover assembly and the asphalt. In addition, the use of open-pored asphalt (OPA asphalt) in the construction of the road should be easily possible, reduces the installation time and the amount of materials used, in particular grout and grout, are reduced.

Main features of the invention are specified in the characterizing part of claim 1 and in claim 11. Embodiments are the subject of claims 2 to 10 and 12th

In a manhole cover assembly for use in road construction and rehabilitation process, with a closure element and a manhole cover frame, the manhole cover frame is formed in two parts from a closure receptacle for receiving the closure element and a concrete support, wherein the concrete support body and the closure receptacle are at least partially positively and materially connected to each other in that the closure receptacle projects beyond the concrete support body in the direction of the closure element, and the concrete support body has a downwardly tapering side face facing away from the shaft, the invention provides for the closure receptacle to be disposed on the shaft facing away from the shaft Side of the manhole cover assembly has a downwardly angled leg which at least partially surrounds the concrete support body on the side facing away from the shaft.

With this embodiment according to the invention, it is possible that only one joint has to be sealed in the region of the road surface. The downwardly angled leg, which at least partially surrounds the concrete support body on its side facing away from the shaft, defines a clean connection section to the road surface. The connection section thus formed not only ensures a clean joint formation, but also causes the separation of the voltage input from the road structure in the shaft structure.

A typical road construction begins in the lower area with a base course to which the gravel base layer, asphalt base course, binder course and top layer join. A shaft structure is usually formed from manhole cover, balance ring, shaft cone and manhole ring.

Due to the downwardly angled leg according to the invention, which at least partially covers the concrete support body on the side facing away from the shaft, the stresses occurring in the roadworks in the upper region, caused by subsidence and shifts that often result from the heavy traffic loads, but also by different thermal expansion coefficients Materials used in case of temperature changes at the shaft structure, reduced in appearance, since shaft and road structure are largely separated. In addition, the trained individual joint in the embodiment according to the invention is very narrow, which leads to a significantly reduced use of materials. Savings in the grouting mortar and grout material are just as important here as the elimination of the otherwise required asphalt. In addition, the use of asphalt in refurbishment is often difficult because hot asphalt is often not available all day and only in larger quantities. Alternative materials such as cold asphalt are very expensive. Thus, the arrangement according to the invention has a whole series of advantages.

A development of the invention provides that the leg is L-shaped, which further improves the connection to the road construction. The defined L-shaped section ensures optimal contact surfaces between the lock receptacle and the road construction. In addition, it provides a homogeneous joint width between the closure receptacle and the road structure on the entire joint section.

Ideally, the leg is arranged in a non-tapering region of the concrete support body. The taper of the concrete support body then begins directly at the end of the L-shaped leg. In this way, the advantages of both components of the manhole cover frame are perfectly combined.

The vertical L-shaped section provides a good connection to the surface layer of the road structure, which is optimal for the tightness and frost resistance of the system, while the tapered portion of the concrete support body can be optimally supported on the supporting layer of the road structure. This leads to a high durability of the entire manhole cover arrangement.

An alternative embodiment provides that the leg has a groove or an undercut. The formation of at least one undercut leads to an optimal adhesion of the joint material in the sealing area to the cover layer. Ideally, a permanently elastic plastic mortar is used for statically and dynamically highly stressed joints. Alternatively, other Fugenvergussmassen that are processed hot or cold are suitable. Thus, the trained undercut / groove leads to a particularly good seal between the manhole cover and the existing road construction. This permanently and reliably prevents the ingress of moisture or water between the road structure and manhole cover so that rinsing or frost damage, such as, for example, chipping off of asphalt due to frost, can be reliably prevented.

Advantageously, the groove or the undercut is arranged as an annular groove on the shaft side facing away from the closure receptacle. The design as an annular groove ensures even better securing of the joints material and thus by the lower risk of frost or load damage for greater durability of the shaft structure.

A further advantage may also lie in a variant of the invention in the arrangement of a device for receiving an entry aid in the closure receptacle. The fact that an entry aid can be easily and directly inserted into the manhole frame, this is usually in the, the man entering the shaft, in the application a greater acceptance. The safety of persons is thus ensured in the sense of accident prevention regulations in a simple manner.

In addition, in one alternative, an annular groove arranged on the concrete support body at the side facing away from the shaft may be present. This creates with its contoured expression of the tapered side surface of the concrete support a particularly good claw with the grout, which ensures a durable optimal load transfer.

A comparison with the aforementioned improved embodiment provides that three evenly spaced annular grooves are arranged on the concrete support body on the lateral side facing away from the shaft, which ensure a very homogeneous and even better toothing of the grouting mortar with the manhole cover arrangement. This generates an adhesion-optimized surface on the manhole cover in the area of the load transfer surfaces.

Advantageously, the downwardly tapering shaft facing away from side surface of the concrete support body begins at the lower end of the leg of the closure receptacle. In particular, a flush transition occurs. This achieves a clear separation of the edge regions between the support function of the concrete support body in the binder layer with a supporting function and the sealing function of the closure receptacle in the cover layer. This leads to a particularly durable solution.

• – mittels eines Fräskopfes eine Einbauöffnung über einem Schachtbauwerk derart freigefräst wird, dass die ausgebildete Fräskante im oberen Bereich korrespondierend zu der einsetzbaren Verschlussaufnahme des Schachtabdeckungsrahmens und im unteren Bereich korrespondierend zu dem an der Verschlussaufnahme angeordnetem Betonstützkörper verläuft,
• – danach der Schachtabdeckungsrahmen gemäß einem der Ansprüche 1 bis 8 über dem Schachtkopf ausgerichtet und provisorisch derart fixiert wird, dass ein zu verfüllender Ringraum ausgebildet ist,
• – anschließend der Ringraum im Anlagebereich des Betonstützkörpers mit einem Vergussmörtel verfüllt wird,
• – und abschließend der verbleibende Ringraum im Bereich der Verschlussaufnahme mit einem dauerhaft elastischen Kunststoffmörtel für statisch und dynamisch hochbelastete Fugen verfüllt wird.

An inventive method for installing a manhole cover frame according to one of claims 1 to 9 provides that

• By means of a milling head, an installation opening is milled over a shaft structure in such a way that the formed milling edge runs in the upper area corresponding to the insertable closure receptacle of the manhole cover frame and in the lower area corresponds to the concrete support body arranged on the closure receptacle,
• - Then the manhole cover frame according to one of claims 1 to 8 aligned above the shaft head and provisionally fixed such that an annular space to be filled is formed,
• - Then the annulus is filled in the contact area of the concrete support with a grout,
• - And finally the remaining annular space in the area of the closure receptacle is filled with a permanently elastic plastic mortar for statically and dynamically highly loaded joints.

The method according to the invention thus ensures, in a simple and cost-effective manner, the formation of a dimensionally accurate excavation for the manhole cover arrangement to be used. The gap formed as an annular space is optimally chosen in size and ideally distributed on all sides of the manhole cover arrangement. The joint space is thus very narrow overall compared to the solutions of the prior art and only a small amount of joint material is required.

By forming the joint by means of milling, the same joint gap can be used both for anchoring the concrete support body in the binder layer with a supporting function and for sealing the closure receptacle relative to the cover layer. In the process, first the grouting mortar and then the elastic plastic mortar are introduced into the joint space. The installation time for the introduction of the grout and the sealing compound is thus reduced.

Since the plastic mortar is also suitable for sealing the closure receptacle against open-pored asphalt, it can now be used with a manhole cover according to the invention despite the use of a manhole cover frame with downwardly tapering concrete support body. The known from the prior art connection problem and the associated cracking between manhole cover assembly and the cover layer are thus effectively and permanently avoided.

Particularly advantageously, the method is carried out when the permanently elastic plastic mortar fills the groove in the leg. As a result, the position assurance of the sealing compound is particularly effective. Thus installed manhole cover arrangements are thus very durable.

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

1 a manhole cover assembly according to the invention;

2 a detail of a manhole cover assembly according to the invention in the joint area in the installed state;

3 a manhole cover assembly prior to use in a road construction;

4 above manhole cover arrangement in the installed state in section;

5 a manhole cover assembly according to the invention in the installed state in plan view.

1 shows a manhole cover assembly according to the invention 1 for use in road construction and rehabilitation processes, with a closure element 6 and one Manhole cover frame 2 , wherein the manhole cover frame 2 two-part from a closure 3 for receiving the closure element 6 and a concrete support 4 is formed, wherein the concrete support body 4 and the lock receptacle 3 at least partially positively and materially connected to each other, the closure receptacle 3 the concrete support 4 in the direction of the closure element 6 surmounted, and the concrete support body 4 a downwardly tapering shaft facing away side surface 5 having, wherein the closure receptacle 3 on the side facing away from the shaft 7 the manhole cover arrangement 1 a downwardly angled leg 8th comprising the concrete support body 4 on the side facing away from the shaft 7 at least partially.

This is the thigh 8th L-shaped and in a non-tapered area 9 of concrete support 4 arranged. Furthermore, it can be seen that the leg 8th a groove 10 having. The groove 10 is here as an annular groove on the shaft side facing away from the side 7 the lock receptacle 3 arranged. In addition, in the lock receptacle 3 a device for receiving a boarding aid 11 educated. In addition, the concrete support body 4 at the shaft facing away from tapered side surfaces 5 three equally spaced annular grooves 12 arranged. The downwardly tapering shaft facing away side surface 5 of concrete support 4 starts at the bottom 13 of the thigh 8th the lock receptacle 3 , Furthermore, a ring reinforcement 14 in the concrete body 4 to recognize.

2 describes a section in the region of the joint formation of a manhole cover arrangement according to the invention 1 in the installed state. After carrying out the method according to the invention for installing a manhole cover frame according to any one of claims 1 to 9, it can be seen that the at the binder layer with supporting function 15 trained milling edge 19 in the upper area 20 corresponding to the closure receptacle used 3 of the manhole cover frame 2 and at the bottom 21 corresponding to that on the closure receptacle 3 arranged concrete support body 4 runs. The annular space to be filled 22 is completely filled.

In the contact area of the concrete support body 4 this is with a grout 18 done, and in the area of the closure shot 3 with a permanently elastic plastic mortar 17 for statically and dynamically heavily loaded joints. The permanently elastic plastic mortar 18 fills the groove 10 in the thigh 8th completely off.

Furthermore, it is shown that the plastic mortar 17 with the topcoat 16 in contact while the grout 18 the annulus 22 to the binder course with a supporting function 15 delimited. On the bay facing away from the tapered side surface 5 are the ring grooves 12 to recognize the teeth of the concrete support body 4 with the grout 18 guarantee.

3 shows the manhole cover assembly according to the invention 1 in front of over a balancing ring 24 to be mounted on the shaft head 23 , One recognizes the cut-free by means of a milling head mounting hole 26 , wherein the trained milling edge 19 in the upper area 20 corresponding to the insertable closure receptacle 3 and at the bottom 21 corresponding to that on the closure receptacle 3 arranged concrete support body 4 runs. In the example shown below is below the binder layer with supporting function 15 still a base course 25 arranged.

4 describes the manhole cover assembly according to the invention 1 in the installed state. It is well shown that the top of the closure receptacle 3 with the top of the topcoat 16 a planum 27 form. Through the introduced plastic mortar 17 in the groove 10 the lock receptacle 3 creates a very neat joint situation, which ensures a good tightness, so that no water in the binder layer with bearing function 15 can get. The grout 18 connects via the ring grooves 12 of concrete support 4 ideally with this and the adjacent binder layer with bearing function 15 and the base layer 25 , In addition, the grout 18 sure that the concrete support body 4 evenly on the compensation ring 24 rests, which leads to a homogeneous stress distribution in the component and the associated longevity. The device for receiving a boarding aid 11 is located in the edge area of the shaft entrance and is thus practically positioned.

5 describes the manhole cover assembly according to the invention 1 when installed from a bird's eye view, but without closure element. It is only the top layer 16 of the road structure recognizable. The manhole cover frame 2 borders with its closure 3 over only one joint of plastic mortar 17 to the topcoat 16 , Furthermore, the device for receiving a boarding aid 11 recognizable.

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

All resulting from the claims, the description and the drawing features and advantages, including structural details, spatial arrangements and Process steps, can be essential to the invention, both for themselves and in various combinations.

LIST OF REFERENCE NUMBERS

1

Manhole cover assembly

2

Manhole cover frame

3

locking receiver

4

Concrete support body

5

rejuvenating side

6

closure element

7

bay side facing away

8th

leg

9

non-rejuvenating area

10

 groove

11

 Device for receiving a boarding aid

12

 ring grooves

13

 lower end

14

 ring reinforcement

15

 Binder layer with carrying function

16

 topcoat

17

 Plastic mortar

18

 grout

19

 milling edge

20

 Upper area of the milling edge

21

 lower area of the milling edge

22

 annulus

23

 wellhead

24

 compensation ring

25

 base course

26

 hole

27

 Planum

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been 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.

Cited patent literature

• DE 102006056936 A1 [0005, 0007]

Claims (11)

Manhole cover arrangement ( 1 ) for use in new road construction and rehabilitation processes, with a closure element ( 6 ) and a manhole cover frame ( 2 ), wherein the manhole cover frame ( 2 ) in two parts from a closure receptacle ( 3 ) for receiving the closure element ( 6 ) and a concrete support body ( 4 ), wherein the concrete support body ( 4 ) and the closure receptacle ( 3 ) are at least partially positively and materially connected to each other, the closure receptacle ( 3 ) the concrete support body ( 4 ) in the direction of the closure element ( 6 ) and the concrete support body ( 4 ) a downwardly tapering shaft facing away side surface ( 5 ), characterized in that the closure receptacle ( 3 ) on the side facing away from the shaft ( 7 ) of the manhole cover arrangement ( 1 ) a downwardly angled leg ( 8th ) comprising the concrete support body ( 4 ) on its side facing away from the shaft ( 7 ) at least partially. Manhole cover arrangement ( 1 ) according to claim 1, characterized in that the leg ( 8th ) Is L-shaped. Manhole cover arrangement ( 1 ) according to claim 1 or 2, characterized in that the leg ( 8th ) in a non-tapered area ( 9 ) of the concrete support body ( 4 ) is arranged. Manhole cover arrangement ( 1 ) according to one of the preceding claims, characterized in that the leg ( 8th ) a groove ( 10 ) having. Manhole cover arrangement ( 1 ) according to claim 4, characterized in that the groove ( 10 ) as an annular groove on the shaft side facing away from the side ( 7 ) of the closure receptacle ( 3 ) is arranged. Manhole cover arrangement ( 1 ) according to one of the preceding claims, characterized in that in the closure receptacle ( 3 ) a device ( 11 ) is designed to receive an entry aid. Manhole cover arrangement ( 1 ) according to one of the preceding claims, characterized in that on the concrete support body ( 4 ) at the side facing away from the shaft at least one annular groove ( 12 ) is arranged. Manhole cover arrangement ( 1 ) according to claim 7, characterized in that on the concrete support body ( 4 ) on the lateral side facing away from the shaft three equally spaced annular grooves ( 12 ) are arranged. Manhole cover arrangement ( 1 ) according to any one of the preceding claims, characterized in that the downwardly tapering side facing away from the shaft ( 5 ) of the concrete support body ( 4 ) at the lower end ( 13 ) of the thigh ( 8th ) of the closure receptacle ( 3 ) begins. Method for installing a manhole cover frame ( 2 ) according to one of claims 1 to 9 wherein - by means of a milling head an installation opening ( 26 ) is milled over a shaft structure such that the formed milling edge ( 19 ) in the upper area ( 20 ) corresponding to the insertable closure receptacle ( 3 ) of the manhole cover frame ( 2 ) and at the bottom ( 21 ) corresponding to that on the closure receptacle ( 3 ) arranged concrete support body ( 4 ), then the manhole cover frame ( 2 ) according to one of claims 1 to 8 aligned above the shaft head and provisionally fixed such that an annular space to be filled ( 22 ) is formed, - then the annulus ( 22 ) in the contact area of the concrete support body ( 4 ) with a grout ( 18 ), and finally the remaining annulus ( 22 ) in the area of the closure receptacle ( 3 ) with a permanently elastic plastic mortar ( 17 ) is filled for statically and dynamically highly loaded joints. A method according to claim 10, characterized in that the permanently elastic plastic mortar ( 17 ) the groove ( 10 ) in the thigh ( 8th ).

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