DE19858934A1 - Concrete shaft under part production process - Google Patents

Abstract

The invention relates to a method and a device for producing shaft bases and/or shaft blanks from pourable "KS" concrete. The invention makes use of both self-supporting shaft bottoms having integrated channels and collars for connecting pipes as well as self-supporting inserts. The above method is special in that it permits the production of shaft bases and shaft blanks characterized by variable useful heights, absolutely dimensionally stable upper collars and a homogeneous structure.

Description

State of the art

There are processes for manufacturing manhole bases made of concrete with self-supporting internals Plastic and other materials from patent application P 320 5833.0.25, the published patent application DE 44 18 370 A1 and the European patent EP 0454098 A2 are known.

For these applications, it is significant that the manhole bases are manufactured upside down compared to the position of use. This is done in molds ( Fig. 1), which consist of a mold core 1 , a mold shell 2 , a lifting device 3 and a press bell 4 . Core 1 and molded jacket 2 are firmly assigned to each other and rigid. They form a concentric gap. Press bell 4 and lifting device 3 are adjustable in height.

At the start of production, the lifting device 3 is moved to its lowest position with a lower sleeve. The concentric gap between the mold core 1 and the mold jacket 2 is tightly sealed at the bottom. On top of the mold core 1, a manhole base made of plastic or another self-supporting built-in element is placed, concrete is filled up and compacted.

Finally, the press bell 4 moves downwards, dips into the molded casing 2 ( FIG. 2) and smoothes the shaft floor. Then the lower sleeve 5 and with it the freshly poured manhole base are lifted out of the mold by the lifting device 3 and thus released. It can be removed; a new production cycle can begin.

problem

The invention described below presents a method for manufacturing manhole bases, at which the mold core rises and can be set up variably. This allows manhole bases to be used produce different usable heights.

This is done with the help of self-supporting shaft floors or insert elements that follow of production remain as lost formwork in the lower part of the manhole. The shaft floors have integrated Channel with sleeves for pipe connections. Shafts made with such floors are appropriate for each Application precisely adapted and can be used immediately after production and curing.

Manhole bases with shelves are blanks and can only be used as such when they are being manufactured Sleeves or seals for pipe connections must also be shaken in. This is part of the procedure.

Fig. 3 shows that the core 1 is provided with a vibrating ring 2 . With this vibrating ring 2 , he picks up the lower sleeve ( 3 ), receives a shaft base 4 or insert element and moves upwards into a fixed position. In parallel or at different times, the shaped jacket 5 moves downwards, centers with the core 1 and is placed on the base plate 6 .

Then the feeder, with the loading trolley 8 and distributor 9 , functions. The loading trolley 8 moves forward until the distributor 9 is coaxially above the molding device and gives it concrete evenly - which the distributor 9 does.

If sufficient concrete is filled in, the loading trolley 8 moves back. The press 10 moves downward, dips into the mold jacket 2 and presses and smoothes the bottom of the vibrated manhole base 11 or blank ( Fig. 4). Then the core 1 dips and leaves the lower sleeve with the manhole base 11 or blank made on the base plate 6 . Whether the lower part of the manhole or the blank, a moving cart or a forklift takes care of the removal to the parking and drying area, a new cycle can begin.

The self-supporting shaft floors 4 or insert elements used in the production project into the concentric gap between the core 1 and the shaped jacket 5 , but leave at least 70% of this gap free. This ensures that the gap fills up with concrete and that the internals also carry the concrete on them.

The invention provides, alternatively, with before, the supporting function of the tires fitted to the core 1 vibrating ring 2 to transfer a lifting device 12 (Fig. 3), but otherwise stick to the already described procedure.

In addition, the problem described at the outset can also be solved by placing the lower sleeve 3 on the base plate 6, driving the core 1 through it, placing the shaft bottom 4 or the insert element on it, then searching for the useful height and remaining there until the production of the shaft lower part is completed. However, this has the following disadvantages:

• a) Either mold shells 5 of different heights must be used and the feeder 8 must be adjustable in height or
• b) a distributor 9 must be used, which dips into the molded jacket to different depths and also receives support from a telescopic press.

Both variants are technically complex, but are not excluded.  

Reference list Fig. 1 / Fig. 2

1

Mold core

2nd

Molded jacket

3rd

Lifting device

4th

Press bell

5

Subframe

Fig. 3 / Fig. 4

1

Mold core

2nd

Vibrating ring

3rd

Subframe

4th

Manhole bottom

5

Molded jacket

6

Base plate

7

Working platform

8th

Loading trolley

9

Distributor

10th

Press head

11

Manhole base

12th

Lifting device

Claims (8)

1. A process for the manufacture of concrete manhole bases with self-supporting manhole floors or insert elements, characterized in that the core ( 1 ) of the molding device described can be set up in terms of height, whereby manhole bases ( 11 ) or blanks of any desired usable height can be produced.
The process comprises the steps:

• a) receiving a lower sleeve ( 3 ) through the core ( 1 ) or with a lifting device ( 12 )
• b) placing a shaft floor ( 4 ) or an insert element on the core ( 1 )
• c) driving the lower sleeve ( 3 ) and the shaft bottom ( 4 ) or the insert element into a height position corresponding to the predetermined usable height
• d) placing the shaped jacket ( 5 ) on the base plate ( 6 ) while simultaneously centering and producing an exactly concentric gap between the core ( 1 ) and the shaped jacket ( 5 )
• e) loading the molding device with concrete with uniform distribution of the same with the distributor ( 9 ) of the feeder
• f) Compacting the filled concrete by shape-related vibration - core or shell side
• g) driving the feeder wagon ( 8 ) with the distributor ( 9 ) back to the starting position
• h) Pressing and smoothing the shaft bottom with the press ( 10 )
• i) Demoulding and lowering the manhole base ( 11 ) or blank to the footprint.

2. The method according to claim 1, characterized in that the shaft floor ( 4 ) as insert element in the concentric gap between the core ( 1 ) and molded jacket ( 5 ) protrude, but leave at least 70% free. 3. The method according to claim 1 and 2, characterized in that the channel of the manhole bottom ( 4 ) with its attached sleeves bears against the shaped jacket ( 5 ). 4. The method according to claim 1 and 2, characterized in that in connection with insert elements Sleeves are used. 5. The method according to claim 5, characterized in that the lower sleeve ( 3 ) on the base plate ( 6 ) is placed and centered.
The process is as follows:

• a) Place the lower sleeve ( 3 ) on the shaft plate ( 6 )
• b) driving the core ( 1 ) up through the lower sleeve ( 3 )
• c) placing the shaft bottom ( 4 ) or insert element on the core ( 1 )
• d) placing the shaped jacket ( 5 ) on the base plate ( 6 ), taking into account their centering in accordance with claim 1
• e) swiveling a distributor ( 9 ) arranged outside over the shaped jacket ( 5 )
• f) lowering the distributor ( 9 ) into the molded jacket ( 5 )
• g) loading the molding device with concrete, compacting and distributing the concrete
• h) moving the distributor ( 9 ) out of the molded jacket ( 5 ) back to its starting position
• i) moving the press ( 10 ) into the mold
• j) pressing and smoothing the shaft floor
• k) Moving the molding device apart, demoulding and moving the lower shaft part ( 11 ) or blank to the footprint.

6. The method according to claim 6, characterized in that the press ( 10 ) is designed so that it can act as a distributor, but also as a press. 7. The method according to claim 6 and 7, characterized in that the press after distributing below the distributor is closed and then works as a press. 8. The method according to claim 1 and 5, characterized in that the shaft floor ( 4 ) or insert element can be supported if necessary on a reinforcement cage.