Manhole base liner and method for manufacturing a manhole base liner

Abstract

A manhole base liner (1), in particular for a wastewater manhole, has a base body (2) which comprises a tread surface (3) and at least one pipe connection opening (5). The base body (2) is produced in one piece from flexible material with a wall thickness, with which it can be bent together substantially arbitrarily in at least partial regions.

Claims

1. A method for producing a formed part having a base body and at least one pipe connection opening, comprising: a) creating a negative form of the formed part, b) at least regionally wrapping the negative form with a flexible film, and c) creating the base body by molding a material in a liquid or pasty state on the negative form, wherein at least one transition strip and/or at least one pipe socket is arranged on the negative form and is molded to the base body.

2. The method as in claim 1, wherein the material is a hardening material.

3. The method as in claim 1, wherein the material is a polymer.

4. The method as in claim 1, further comprising: waiting for the material forming the base body applied in method step c) to become at least partially hardened, and applying a further hardening material to the material forming the base body.

5. The method as in claim 1, wherein the negative form in the method step a) is produced, at least partially, from plastic.

6. The method as in claim 1, wherein the method step b) is subdivided into the following method steps: b1) placing the negative form in an upwardly open wrapping device, b2) covering the wrapping device with the flexible film, and b3) generating a negative pressure in a region between the flexible film and the negative form, whereby the flexible film attaches to the negative form and wraps it.

7. The method as in claim 6, wherein after method step b2) an overpressure is generated in the region between the flexible film and the negative form, so that the flexible film bulges away from the negative form and that subsequently the negative form is drawn near the flexible film.

8. The method as in claim 6, wherein after method step b3) a belt or the like is clamped tightly around the flexible film and around the negative form.

9. The method as in claim 1, wherein during and/or after the method step c) at least one bonding bridge is molded to the base body and/or connected to it.

10. The method as in claim 1, wherein the formed part is a manhole base liner.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Further details, features and advantages of the invention will become apparent from the following description of preferred and non-limiting embodiments of the invention with reference to the accompanying drawings. They show:

(2) FIG. 1 is an isometric view of an embodiment of a manhole base liner according to the invention,

(3) FIG. 2 is an isometric view of the bent together manhole base liner of FIG. 1,

(4) FIG. 3 is an isometric view of a further embodiment of a manhole base liner according to the invention, connected to a manhole wall liner,

(5) FIG. 4 is a section along the plane IV through the manhole base liner of FIG. 3,

(6) FIG. 5 is a detailed view of a detail V from FIG. 4,

(7) FIG. 6 is a further detailed view of a detail VI from FIG. 4,

(8) FIG. 7 is a further detailed view of a detail VII from FIG. 4, and

(9) FIG. 8 is a section through a wrapping device, a negative form and a flexible film for use in a method according to the invention for the production of a formed part, in particular a manhole base liner according to the invention.

DETAILED DESCRIPTION

(10) FIG. 1 shows a manhole base liner 1 according to the invention having a base body 2 which has a tread surface 3 with a channel 4 sunken therefrom, wherein the tread surface 3 is essentially circular in the embodiment shown in FIG. 1, but other forms (for example, polygons) are also conceivable within the scope of the invention. The channel 4 connects pipe connection openings 5, which are arranged below the tread surface 3.

(11) The base body 2 is made of a flexible material and is produced in a wall thickness which allows it to be essentially arbitrarily bent together along any contours at least in the areas in which it does not have an increased deformation resistance due to its spatial shape.

(12) At the edge of the tread surface 3, a connecting edge 6 is arranged which, preferably substantially perpendicularly, projects upwards away from the tread surface 3 and runs along an outer contour of the tread surface 3. The connecting edge is preferably but not necessarily made in one piece with the base body 2 and has an edge inner side 7 which is essentially completely covered by a transition strip 8.

(13) A pipe socket 9 is arranged in or at each pipe connection opening 5. In this case, each pipe socket 9 is partially accommodated in a tubular connecting piece 11 protruding from the respective pipe connection opening 5 and is connected tightly to the pipe connection opening 5 and the base body 2 by way of this.

(14) The tubular connecting piece 11 has either already been made in one piece with the base body 2 and thus made of the same material as this, or is a transitional strip 8 made of a textile-coated thermoplastic material or of a glass fiber-reinforced plastic, which can be fixedly and tightly connected both to the material of the base body and the material of the pipe socket. Alternatively, the connecting piece 11 can be connected to such a transition strip 8, which is preferably arranged along an inner side of the connecting piece 11, in particular connected thereto.

(15) FIG. 2 shows the manhole base liner illustrated in FIG. 1 in a bent-together shape, whereby the outer dimensions of the manhole base liner 1 can be substantially reduced in at least one direction. Thus, the manhole base liner 1 can in a bent-together shape be passed through an entry opening, in particular a manhole which is narrower at its widest point than the diameter of the tread surface 3.

(16) FIG. 3 shows an isometric view of a manhole base liner 1 according to the invention, which is connected in the region of the connecting edge 6 to a manhole wall liner 12.

(17) The manhole base liner shown in FIG. 3 has strip-shaped bonding bridges 13 which are arranged at suitable points on the underside of the base body 2. Furthermore, granulate-shaped bonding bridges 14 are attached to an outwardly facing surface 16 of the base body 2, in particular in the region of the underside or preferably in all regions of the base body 2 which are back filled with filler material. In the illustrated embodiment, the manhole wall liner 12 has further bonding bridges 15 arranged in the region of the outer side. The bonding bridges 13, 14 and 15 are used for the later anchoring of the manhole base liner 1 or of the manhole wall liner 12 in the backfilled material.

(18) FIG. 4 shows a section along the plane IV through the manhole base liner 1 shown in FIG. 3 and the manhole wall liner 12 connected thereto. The channel 4 between the pipe connection openings 5 located in the sectional plane IV has a slope with a slope angle , wherein other regions of the channel 4 can have either no slope or a slope with a same or different slope angle .

(19) FIG. 5 shows an enlarged detail V from FIG. 4 in the region of the pipe connection opening 5.

(20) The tubular connecting piece 11 of the pipe connection opening 5 protruding from the base body 2 encloses the pipe socket 9 and is tightly connected thereto over the entire outer circumference of the pipe socket 9.

(21) The detail VI from FIG. 4, which is shown enlarged in FIG. 6, is arranged in the region of the connecting edge 6.

(22) A transition strip 8 is arranged on the edge inner surface 7 of the connecting edge 6 and covers the inner edge surface 7 of the connecting edge 6 substantially completely.

(23) The transition strip 8 consists of a thermoplastic material with at least one textile-coated side, is molded onto the base body 2 during the production of the base body 2, and is firmly and tightly connected to the connecting edge 6 via the textile-coated side abutting against the edge inner surface 7.

(24) The manhole wall liner 12 is at least partially in sections accommodated in the connecting edge 6 or transition strip 8 of the manhole base liner 1 so that an overlapping region 17 is formed between the manhole wall liner 12 and the transition strip 8 connected to the connecting edge 6.

(25) The manhole wall liner 12, which consists of a thermoplastic material in the embodiment shown in FIG. 6, is connected to the transition strip 8, which is also made of a thermoplastic material, in particular welded to the transition strip 8 at the edge of the manhole wall liner 12, by means of a weld 18.

(26) The detail VII of FIG. 4 shown in a larger detail in FIG. 7 is arranged in the region of the connecting edge 6 and the pipe connection opening 5.

(27) In the embodiment shown in FIG. 7, the pipe socket 9 is substantially entirely accommodated in the associated pipe connection opening 5 and is tightly connected to the pipe connection opening 5 and the base body 2.

(28) The manhole wall liner 12 is accommodated in the connecting edge 6 of the manhole base liner 1 and lines against a step 19 running in the connecting edge, wherein the overlapping region 17 between the connecting edge 6 and the manhole wall liner 12 form a kind of sleeve. An inner side of the manhole wall liner 12 essentially connects to the edge inner side 7 below the overlapping region 17 in a step-free or flush manner.

(29) The manhole wall liner 12, which in the embodiment shown in FIG. 7 consists of a thermosetting material, is connected to the connecting edge 6, which is likewise made of a thermosetting material, in particular in which the manhole wall liner 12 is glued to the connecting edge 6 in the overlapping region, or in which a strip is laminated over the joint between the step 19 and the manhole base liner 12.

(30) FIG. 8 shows a preferred embodiment of a wrapping device 21 for carrying out the method according to the invention for producing a formed part, in particular a manhole base liner 1 according to the invention.

(31) The wrapping device 21 has a hollow cylindrical outer body 22, which is bounded upwards by a plate 23 with a central opening 24 and is preferably closed downwards.

(32) In the outer body 22, a support table 25 is arranged parallel to the plate 23, which is adjustable by means of a lifting mechanism 26 between a lowered position, in which it is spaced from the plate 23 and the raised position shown, in which it rests against the plate 23 from below, in particular sealingly.

(33) In a preferred implementation of the method according to the invention for producing a formed part in which the formed part is a manhole base liner 1 according to the invention, a negative form 27 of the manhole base liner 1 is arranged on the support table 25, wherein the support table 25 is in the lowered position.

(34) The negative form 27 follows the shape of the finished manhole base liner 1 and further comprises a hollow cylindrical base body 29, which is arranged on a base plate 28 lying on the support table 25.

(35) The base body 29 is closed at an end opposite the base plate 28 by a cover plate 31, which in the illustrated embodiment has the shape of a blunt conical tip facing away from the base plate 28. A channel shaped body 32 which projects upwards from the cover plate 31 has the internal shape of the channel 4 of the formed part, in particular the manhole base liner 1.

(36) The base plate 28 closes the base body 29 from below and has a diameter which is smaller than the diameter of the opening 24. Valves 33, which are arranged on the support table 25 and on the base plate 28 or penetrate the support table 25 and the base plate 28, connect non-illustrated lines for fluid, in particular for air, to a cavity 34 formed in the base body 29.

(37) Through holes 35 arranged in the cover plate 31 form a connection for the fluid between the cavity 34 and the space above the cover plate 31.

(38) After the negative form 27 has been arranged on the support table 25, a flexible film 36 is arranged on top of the plate 23 so that the opening 24 is covered by the film 36.

(39) The flexible film 36 is pressed tightly against the plate 23, which takes place in particular along an outer edge of the plate 23 and preferably with a clamping device 37 arranged there.

(40) In a further method step, fluid, in particular air, is blown into the cavity 34 by one of the valves 33 so that an overpressure is formed between the negative form 27 and the flexible film 36, and the flexible film 36, as shown dotted in FIG. 8, is inflated. The flexible film 36 thereby protrudes upwards from the plate 23 in the form of a dome. Subsequently, or at the same time, the support table 25 is moved to the raised position shown in FIG. 8. Theoretically, the negative form 27 could also be lifted upwards in the context of the invention without the prior inflation of the film 36 and the film 36 can be thereby be tightened. However, this is less advantageous because the film 36 is thereby subjected to higher mechanical stress.

(41) In this raised position of the support table 25, the fluid is suctioned off by the other valve 33, whereby a negative pressure is formed between the negative form 27 and the flexible film 36, and the flexible film 36 is pressed against the negative form 27 by the ambient pressure. Due to the previous pretension, the flexible film 36 is fitted against the negative form 27 without wrinkles and wraps it.

(42) In the following method step, a belt 38 is arranged around the film 36 in the region of the plate 23, in particular being clamped around it. In this case, the belt 38 preferably also covers a base region 39 of the base body 29 and abuts the latter, wherein the film 36 is pressed externally against the base region 39 and the base plate 28, and a tight connection is formed between the base plate 28 and the base body 29.

(43) After locking the valves 33 and releasing the clamping device 37, the negative form 27 can be removed from the wrapping device 21 of the support table 25 without the negative pressure within the negative form 27 being lost.

(44) In the following method step, material can be molded onto the negative form 27 wrapped with the flexible film 36.

(45) The negative form 27 or single or several parts of the negative form 27 can be detached at a later time from the formed part molded thereon and can thus be used for the production of further form parts. It is likewise possible to use the belt 38 and the flexible film 36 for producing further formed parts.

LIST OF REFERENCE NUMBERS

(46) 1 Manhole base liner 2 Base body 3 Tread surface 4 Channel 5 Pipe connection opening 6 Connecting edge 7 Edge inner side 8 Transition strips 9 Pipe socket 10 --- 11 Connecting piece 12 Manhole wall liner 13 Bonding bridge with geometrically defined shape 14 Granulated bonding bridges 15 Other bonding bridges 16 Surface 17 Overlapping region 18 Weld 19 Step 20 --- 21 Wrapping device 22 Outer body 23 Plate 24 Opening 25 Support table 26 Lifting mechanism 27 Negative form 28 Baseplate 29 Base body 30 --- 31 Cover plate 32 Channel-shaped body 33 Valves 34 Cavity 35 Through holes 36 Flexible film 37 Clamping device 38 Belt 39 Base region Slope angle IV Sectional plane V Detail VI Detail VII Detail