DE19703350C2 - Process for installing a cast iron frame for manhole covers - Google Patents

Description

The invention relates to a method for installing a cast iron frame according to the preamble of the patent saying 1.

A perfect position of the manhole covers on the manhole structures and inside half of the surrounding area (road surface) is an essential prerequisite for the function of these components in the increasingly heavily used traffic areas. This includes one full-surface mortaring of the cover frame and a professional bond with the surrounding area.

In practice, however, manhole structures are found that are either too high or too deep were installed so that when the manhole cover frame is put on site must be manipulated.

If the shaft structure is too high, the cover frames will be inadmissible shortened (especially in the case of old cast-iron frames that do not yet pass through) Cast apron had!), With shafts lying too low, a height adjustment with inadequate aids, such as broken glass, pieces of wood, etc., and then only partially mortared from the inside of the shaft (finishing mortar!). Thereby the familiar damage patterns arise: frames wobble and sink around the Spider-like cracks form around the cover. Such, not fully mortarized Covers are not up to today's dynamic traffic loads!  

In such cases, the cover needs to be refurbished, often also under time pressure. Is it evident that the cover frame has become defective, ge the usual lifting and re-grouting is not enough; it must have complete coverage be replaced. So far z. B. from DIN 4290 manhole covers, which in the concrete ring below the cast iron frame several contact surfaces for the Have dirt traps. These are molded in at the factory. In addition are in DE-GM 71 28 065 and DE 30 43 078 A1 dirt trap pockets in cast iron frame included. They are surrounded by a continuous cast wall, are below the contact surface of the manhole cover and only protrude into the Concrete backfill. Thus there is a fixed assignment of frame, concrete backfill and mud flap pockets.

The invention has for its object to provide a manhole frame made of cast iron create the particularly low due to an extremely low height for renovation purposes is suitable and where the mud flap pockets are easy and safe to install have it made.

The frame according to the invention has the features mentioned in claim 1. in the In the area of the mud flap pockets, the cast iron frame is opened downwards, that removable cores inserted into the mud flap pockets during assembly become. These protrude beyond the lower edge of the frame and form in mortar to be poured into the lower part of the mud flap pockets and the Mud flap pads. Only the upper part of the mud flap pockets is in the frame arranged. The lower part, however, is in the grout. This allows the frame be designed extremely low.

The cores are preferably made of an elastic material. So that they are all the same Depth of use in the frame, they have an upper stop, which except for the Lid support of the frame is pressed. As a result, the molded in the mortar Mud flap covers all on the same level. Handles on the cores allow that Pull out the cores after the mortar has hardened so that they can be used again can be.  

To adjust the frame, it has reinforcements on the underside. By wedging under these reinforcements there is one before grouting with mortar precise fixing to the installation height possible.

The frame's mud flap pockets do not form the dirt at the same time catcher pads, which requires a relatively large height of the frame. The frame owns rather, downward open mud flap pockets, while the mud flap pads are placed in the mortar to be placed under the frame. Since also the Mortar thickness can be used for the mud flap pockets and pads, the frame height will be much lower than before. The very flat frame is for renovation best suited for purposes.

The drawing shows an embodiment of the invention, one each vertical section through parts of the attachment and the frame. It shows:

Fig. 1: The section through the frame with adjusting wedges,

Fig. 2: the section through the frame with inserted cores and

Fig. 3: the section through the frame after grouting with mortar while removing the cores.

The cast-iron frame 1 has dirt-collecting pockets 2 open at the bottom and cores 3 inserted therein with an upper stop 4 and a handle 5 . The frame 1 also has lower reinforcements 6 . Wedges 7 between the shaft neck 8 or a support ring and the reinforcements 6 are used for exact adjustment. The cavity between the manhole neck 8 , the original roadway 9 and the frame 1 is grouted with special mortar 10 . After removing the cores 3 , the lower part of the mud flap pockets and the mud flap support 11 are formed in the mortar 10 .

The laying of the renovation frame according to the invention is carried out as follows:  

• - Pull out the defective manhole frame using a lifting device;
• - Removal of all loose material and subsequent blowing out using compressed air;
• - Insert the new frame 1 and adjust the height using wedges 7 on the marked reinforcements 6 .
• - Pressing the cores 3 into the dirt trap pockets 2 of the frame 1 up to the stops 4 ;
• - Install internal formwork (e.g. hose formwork);
• - Mix special mortar (fast curing, highly flowable, shrink free) (against common whisk) and pour in both from the inside and outside;
• - After a short setting time of the mortar 10 remove the inner formwork and reusable cores 3 ;
• - remove mortar residues;
• - Existing roadway depression as well as longitudinal and transverse cracks around the frame seal / adjust around with special bitumen;
• - Insert dirt trap and manhole cover, traffic clearance after approx. 45 minutes.

Claims (4)

1. A method for installing a cast iron frame ( 1 ) for manhole covers with mud flap pockets distributed over the circumference ( 2 ), preferably for use for renovation purposes, characterized in that the cast iron frame ( 1 ) in the area of the mud flap pockets ( 2 ) downwards is open that during the assembly of the frame ( 1 ) in the mud flap pockets ( 2 ) removable cores ( 3 ) are inserted, which protrude beyond the lower edge of the frame ( 1 ) and in the mortar ( 10 ) to be poured in the lower parts of the mud flap pockets and Form strainer pads ( 11 ). 2. A method for installing a cast iron frame according to claim 1, characterized in that the cores ( 3 ) preferably consist of elastic material and rest with upper stops ( 4 ) on the lid support surface of the frame ( 1 ). 3. A method for installing a cast iron frame according to claims 1 and 2, characterized in that the cores ( 3 ) have handles ( 5 ) for pulling them out of the mortar ( 10 ) cast frame ( 1 ). 4. A method for installing a cast iron frame according to claim 1, characterized in that on the underside of the frame ( 1 ) preferably three uniformly distributed over the circumference support reinforcements ( 6 ) for adjusting the frame ( 1 ) with wedges ( 7th ) are arranged.