DD272388A3 - PROCESS FOR THE RESTORATION OF UNDERGROUND CHANNELS - Google Patents

Abstract

Field of application of the invention is the rehabilitation of underground sewer systems of any degree of wear, any profile and material type, depth and dimensioning. According to the invention, in each case in the section between two manholes of the sewage system by means of a hard rock drilling machine bored through the cover at the top of the canal Arbeitsoeffnungen at a distance of 5-10 m to the channel, provided two successive Arbeitsoeffnungen with feed pipes, introduced via a shaft structure Festkoerperschalungssegmente and Installed in the center of the two working openings to a centered sealed on both sides inner formwork, then over the first feed pipe a segregation-free concrete mixture without pressure in Eigengefaelle inserted into the annular gap between the inner formwork and corroded channel line and turned off at the time of reaching the Entschalungshaerte the restored channel section between two Arbeitsoeffnungen and the formwork by Traction rope added to the next work section. The method works without excavation and can be applied by superimposing angled tapping of the channel apex.

Description

Field of application of the invention

Dti method is used for the rehabilitation of underground physically, chemically or biologically worn sewer systems of any degree of wear, any profit and material type (eg concrete, Stelmeug, asbestos cement, natural stone, masonry clinker), any dimensioning, depth and overbuilding. Preferably, the method is applicable to sanitation of sewers from DN 300.

Characteristic of the known state of the art,

According to WP 66571 A method and * lne device for lining pipes with Zamentsuspenslon is known. In the method operating according to the extrusion principle, cement slurry of 7 to 12 mm thickness is produced on the inner wall of steel or cast iron pipes up to a maximum length of 50 m. The cleaned steel or cast iron tube assumes the function of the outer formwork, while an air-filled hose takes over the function of the inner formwork. The space thus created is squeezed out with cement suspension, wherein the required gap and the centric position of the tube formwork in the tube is ensured by a system of spacers arranged around the tube. After a Aushgrrtezeit the air is drained from the hose formwork and the hose pulled out of the pipe section.

This procedure is only applicable if the construction tolerances are less than 15mm. These Toloraruen occur only in pipelines of the Materlaigruppen steel, gray cast iron and asbestos cement, also in Steinzeugleliungen.

  , An application of the method is carried out for the door only with a nominal orifice size of 300 mm, because due to the high self - weight of the hose with net and spacer (concrete) for large dimensions and the necessary increased internal pressure of the

No ventilation can be achieved for the lining.

  Not applicable Is there · ZMA procedure according to WP M571 for disposal and other pipelines, which has a

Bautolerani larger JBmm exhibit. These cables are above all Kenlle, the components biw. built monolithic

* were. By physical, chemical and biological corrosion Construction waste occurs in most disposal lines

that lead up to door complete destruction of the pipe walls. An application of the AuspreQverfahrena is in these cases j not possible because the thin liquid cement suspension, introduced under pressure, from the damaged areas and joint areas

uncontrolled Ina Erdreich leaks what causes blockages of connection · and other piping systems and high

Cement losses drives.

Furthermore, it is sufficient that the Stetlk dea pipe is not given again by exceeding the peak pressure load damaged pipes with the thin-walled Auskteldungsschlcht of ZM A-Verf ahrens. For the rehabilitation of sewer systems, there are currently no all-encompassing monorail procedures known. Ea there is a monolithic repair in walkable ken (t.B. In the other cases, the production of the function and safety of the stand is possible only by new construction with replacement of the building with very high construction costs (construction work, road construction, bituminous ceilings, etc.).

Object of the invention

Daa object of the invention beoteht is to develop a method tu that allows for low investment and construction cost of a rehabilitation of underground veischlissenen sewer systems. The method may be applicable with minimum obstruction space (usually without excavation) and under built structures (eg stations, industrial constructions, etc.).

Explanation of the essence of the invention The object of the invention is a method for the restoration and rehabilitation of underground worn Kenalisatlonen

any material * and profile type, dimensioning, depth baugrubenlca on site.

Through the refurbishment a funktlons- and stable sewerage are created, the daa entry of extraneous water

and preventing leakage of sewage into the groundwater area along the canal.

According to the invention, this object is achieved in that in the section "Welding shaft structures of the Sewer by known Spetalbohrtechnlk using a hard rock drilling machine from the top Terrain through the coverage of the canal at the channel vertex work holes are drilled up in the canal. These Holes serve as working openings to clean the channel as a saneration upstream, to vent the kenais and

as a charging port for the refurbishment process.

The distance between successive holes is New depending on the dimension and the wall thickness

tu forming channel line B-10m and the diameter depending on the applied drilling technique usually 100-260mm.

Each work opening (bore) is cased with a reusable thermowell. At least two

successive work openings (holes) are provided with feed tubes. The feed pipes are equipped at the lower end with a clamping device for sealing at the pierced wall of the corroded old sewage system *. In the absence of the wall of the Altkanalisatlon due to complete corrosion d! E sealing of the

Feed pipe against the wall of the introduced into the bore protective tube. For an internal formwork, solid-state formwork segments of known type are introduced via a shaft structure of the channel,

mounted and in the channel in the area of the two first working openings tu a centered, sealed on both sides

Internal formwork installed. The shape of the solid-state formwork segments is corresponding to the profile type (circle, elbow profile, etc.).

gowählt, the length of the segments allows introduction via the pit.

Thereafter, via the first feed pipe, a demixing-free concrete mixture is depressurized at an inherent gradient into the annular gap

filled between inner formwork and corroded sewer pipe. The SrZ'ke of the Rln.ispaltes is dependent on the

Demands such as new declarations to increase r.es li / dMullscher drainage capacity, the stability

of the channel or profile conversion (t. B. circle · to Elprofil). The ring gap corresponds to the wall thickness of the wall to be newly formed. Its strength is between 30 and 160mm,

At the time of reaching the demoulding stage of the concrete mixes, the stripping of the restored concrete is done Channel section between two work openings and a displacement of the formwork to the next working section by means of a Pull cable. By suitable measuring or Pei'geräte (eg., Reader devices), the centering of the front takes place Formwork section. In special cases when overbuilding the canal to be rehabilitated, an angled tapping is made on the canal roof and

the further process steps carried out as mentioned above.

embodiment The invention is based on the example of a Mischwasserkanaliiation DN 500 circular profile, material type concrete, location in Road area, peak coverage 1.60 m, explained in detail werddn. After a rough cleaning by means of high pressure rinsing technology, the following actual state was used in the use of the television channel

detected:

By means of the sliding ladder ImI 8tarknlederachllgen lit, the ground clearance Wi is reduced to 10% wall thickness. Oar

Most of the NutFelt clogs are no longer present due to chemical corrosion, so that wastewater can spill out. Condensation caused by leaching in the 8chelteloerelch dea channel a chemical corrosion of cements, so that larger aggregates biw. have fallen out of the concrete wall. In this state of construction, the further stability of the Kanala is called into question, so that a renovation is required.

Derived from the necessary hydraulic discharge capacity of Mtschwassersi nmters and the future again

corrosion occurring, a wall thickness of 38 mm is selected for the newly creating pipe inside wall. Oils profiles

Circular profile is retained. On the basis of the quantity of the measured value of the elastic concrete at a wall thickness of 35 mm

a spacing of the bores (working openings) from 7 m from the shafts.

For the execution of the drill holes 'Arbeitsöf pungenungen' comes a festgestelnsbohrmeschine with a 360 * swiveling Boring machine drive and a maxlrrdlan drilling depth of 100m door application. It is made with a diameter of 111 mm

drilled.

After measuring the vertex of the Kenals on the road, the holes are up to door outer edge of the channel switch

sunk and removed with a debris pipe DN 100. After changing the Bohrwerkieuges now a smaller sized hole, Durchmmasser 93mm, drilled through the concrete wall of the existing channel. The implementation of the process step drilling the sewer system requires no immediate continuation of the further process steps.

Due to de. new working wall thickness of 36mm Is μ necessary for the internal shuttering FestkOrpersegmente of

430mm profile-wise as circle profile turn it into action. From the diameter of the shaft entrances of 600mm biw.

800mm results for the segments a length of 300mm. After assembly of 24 one-segment segments in the shaft and

Installation as a centered internal cladding over twel working holes (drillings) hlnaua becomes a seal by means of pnjumetlk

made against the Rohrlnnenwend the channel.

In the with Schutirohr developed first two Arbeitsoffnungen (holes) is a new feed pipe In the Concrete wall of the rfanelsciieitels braced. Thereafter, via a feed tube of entmlschunosfrele concrete mixture is filled without pressure in Eigengefllle. For the Transport of concrete mix turn feed pipe is grouted a concrete pump. The Betonlervorgang takes place without

Luslttliche compression and Is at Aufstelgen a measuring mark amtweiten feed tube finished.

After reaching the demoulding unit (determination of the time on a test piece with corresponding wall thickness)

The Austchalproteß done by Umfangsverklelnerung the Innenich 'ment. The inner lining will turn over via rope

Working section injured and the process step-filling with concrete-repeated. Regardless of the original level of construction of Kenalisatlon is thus a function ·· and stable Concrete pipe created. With the solution according to the invention a Verfehron is proposed that a renovation

worn Kenalierungen without reaching the Qesamtstrecke biw. Abbeu or demolition, construction pits and without relocation allows.

The application of the Anbohrtechnologie geitattet you a renovation under superstructures of any kind (t. B. industrial plants, Qleisberelche). By using a mixture of concrete and by filling the oilfield, the losses are lost

en votlstlndlg corroded points of the channel wall very low.

In Betaechtogen printed pamphlets:

DD Zeitschrlft .Wesserwirtschaft - Wassertechnik "Heft 4 (1986) pages 93-96; Issue 12 (1977) Soiten 395-398 USPS 2917065

Claims (8)

1. Method for the rehabilitation of underground sewers, - gekenntelehnet characterized in that in each case in the section between two shaft structures of the sewer system by means of known Spezialbohrtochnlk using a Fixed drilling drill from the top edge of the terrain by covering the channel at the channel Scheltol working openings to be drilled into the channel, which serve as a vent ··, «loading« · and emptying openings, each hole is piped with a reusable protective tube, Tttindestetis zwol successive work openings are provided with feed pipes, which are equipped with a clamping device for sealing at the pierced wall of the corroded old sewage system, Be introduced via a manhole structure of the channel Festkörperschalungssegmente known type and mounted to an inner formwork and this centered in the channel in the region of the first two working openings and sealed on both sides, is installed, - Thereafter, via the first feed pipe, a demixing-free concrete mixture is fed without pressure in an inherent gradient into the annular gap between inner formwork and corroded channel pipe, - At the time of reaching the demoulding hardness of the concrete mixture stripping the restored channel section between two work openings and a displacement of the formwork by means of pull rope to the next working section. 2. The method according to item 1, characterized in that the distance between two successive working orders is 5-1Om depending on the dimension and the wall thickness of the newly formed channel line. 3. The method according to item 1, characterized in that in the absence of the old sewer system through complete corrosion, the sealing of the feed pipe against the wall of the introduced into the work ^ fnungen protective tube. 4. Tractor according to item 1, characterized in that the shape of the formwork segments of the profile type and dimension of the channel is adapted. 5. The method according to item 1, characterized in that the length of the formwork segments is selected so that penetration can take place via the shaft structure without additional excavation. 6. The method according to item 1, characterized in that the introduced formwork is longer than the distance between two work openings each. 7. The method according to item 1, characterized in that the wall thickness of the newly formed wall is between 30 and 150mm. 8. The method according to item 1, characterized in that in overbuilding the sewer angled tapping of the channel vertex takes place