DE29716585U1 - Rehabilitation system for pipes in municipal, commercial and agricultural areas - Google Patents

Description

Rehabilitation system for pipes in the municipal, commercial and agricultural sectors.

The invention relates to a method and a device for rehabilitating pipes and piping systems, in particular underground, inaccessible or accessible sewer pipes in municipal, industrial and agricultural sewage networks, as well as their access shafts.

The invention is based on the object of stabilizing the structure of the sewer pipes or shafts by means of a method and a device and of closing pores, capillaries, cracks and erosion and thus preventing the leakage of dirty water and the ingress of unwanted foreign water.

According to the invention, this object is achieved by coating the insides of installed pipes or pipeline networks or their access shafts with suitable liquid or pasty or powdery repair agents, which are applied by spraying or spinning while an appropriate pressure is maintained in the pipe or shaft. This achieves a uniform coating thickness and the prevailing pressure keeps out any foreign water penetrating and presses the coating material into the cracks and capillaries, thus sealing and pressing the damage back.

State of the art

Numerous sewage pipes, which were mostly laid as concrete or stoneware pipes or coated steel pipes, are in need of renovation and the result is around 40% too much extraneous water in the sewage treatment plants. The renovation of the pipe networks is carried out to minimize leakage losses and to prevent soil contamination. In particular, the repair of sewage networks in which aggressive media are transported is carried out using state-of-the-art technology in such a way that the defective pipe sections are exposed and the individual pipes have to be replaced using an open construction method. This process is very costly and often not possible if the pipes run under buildings or in thick concrete foundations.

DE 3119300 A1 describes a process that uses a device equipped with a TV camera to drill holes in the pipe wall. An injection device then presses plastic into the soil surrounding the pipe. This system has the major disadvantages that the statics are not restored, if there is multiple damage in a pipe each damage must be repaired individually, which is very time-consuming and therefore expensive, and cannot be used in curved areas. Any plastic residue left behind must either be removed using a grinding robot, which is time-consuming and therefore increases costs, or it remains in the sewer, which leads to congestion and ultimately blockages. In addition, it is difficult to locate the damage precisely because the TV camera may become dirty during drilling and impede clear visibility.

If you look at the technology presented in DE 41 31 997 , for example, or the so-called Cherne method and also the Penetryn-Posatryn method, these methods are extremely time-consuming due to the successive repairs that are carried out on multiple damages, as each damage has to be treated individually. The cost of materials and the possible need for a grinding robot are also other factors that have a negative impact on profitability.

DE 40 31 741 A1 describes a device in which a pressurized bath containing liquid remediation agent is drawn through the sewer, whereby the remediation agent is pressed into the damaged areas. Severe socket misalignments and severely deformed pipes can prevent proper progress and thus stop the remediation. In addition, the remediation agent can penetrate into connections to a large extent, which can have very undesirable consequences, including blocking the house connection. This system cannot be used in the bend area of house connections and in the event of groundwater ingress, washing out of incompletely hardened remediation agent cannot be ruled out.

So-called short liners, as described in DE 40 21 456, are, for example, resin-soaked pieces of glass fiber or foam hose or mats which are wrapped around an inflatable packer and placed on the damaged part. The packer is inflated and the resin-soaked mat is pressed onto the pipe wall. Some use hot water to speed up the curing time of several hours, which requires a considerable amount of energy. With a large number of damages, especially if they are in a pipe, such systems have proven to be uneconomical because they take too long. Connections closed or partially closed by short liners must be opened using grinding robots, which increases costs. It is also possible for the liner pieces to become loose when high-pressure flushing devices are used.

In-liner processes, such as DE 35 13 956 or DE 38 01 468, describe a method in which a type of hose in various designs is pulled into the pipe or inserted using a water column or compressed air. The curing process can take several hours, which is quite time-consuming. In addition, some systems require hot water that is pumped through the in-liner under pressure over a longer period of time. The energy required is enormous. Due to the use of pre-liners, e.g. plastic film, which is pulled into the pipe before the actual in-liner, there is no connection to the pipe, which can lead to leaks.

In another design presented in DE 42 13 068, a so-called pre-liner is first inserted into the pipe to be renovated and then the liner, which has spacer studs on the outside, is pulled into the pre-liner. The resulting cavity between the pre-liner and the inliner is filled with a liquid mortar. This does not create a connection with the pipe to be renovated, which leads to leaks if groundwater penetrates, especially in the area of connections and shafts.

For all in-liner or short liner systems, milling out branches is unavoidable, which results in high robot costs. This milling out is often difficult because the closed branches are difficult to locate. Here too, the high time expenditure plays a dominant role. Finally, it can be said about the various liner systems that unfortunately there is often no firm connection to the pipe wall, which can lead to the liner becoming loose, caused for example by high-pressure flushing equipment. Likewise, liner systems are often not suitable for use in bend areas, e.g. of house connections.

The first thing to consider with the various rehabilitation methods using sewer rehabilitation robots, e.g. DE 36 27 556, is the very high initial cost. They are also very prone to malfunction, which can result in the robot having to be dug out. In addition, robot rehabilitation is far too time-consuming and is almost useless if groundwater penetrates, regardless of whether it is a system that fills the damage or presses it in, as the still soft filling material is pressed out of the joints again. After the hardening time, the protruding filling material must be sanded down and smoothed, which can usually only be done the next day. Robots are also often not suitable for smaller cross-sections, such as in house connection lines or in the curved area of shafts, and cannot be used in curves.

Systems are known from DE 40 12 733 and DE 42 12 487 which first introduce a sprayed or spun layer of repair agent, such as a cement-containing mass, into the pipe. An elastic film tube is then drawn into the pipe and pressed into place using heated compressed air which passes through the pipe. In DE 42 12 487, a perforated tube or piece of tube is also required which is approximately the length of the pipe to be repaired and has holes that get larger towards the front end in order to evenly distribute the hot air introduced. This means too many unnecessary work steps which mean too much effort. If you look at these procedures from the point of view of inflowing groundwater, it should be noted that the spun layer of cement was either washed away or did not adhere to the pipe wall in the first place.

In conclusion, it can be said about all of these systems that none of them is able to rehabilitate sewer pipes with or without groundwater ingress and their access shafts in the same way. This always requires a further work step with possibly a different contractor, which means unnecessary loss of time and increases the cost of remediation. Another important aspect concerns the environmental compatibility of this invention, since no plastic films are required, such as those used to press liners on and then end up as waste. The significantly lower energy consumption also plays a decisive role in this regard.

Task

In order to solve this problem of repairing a damaged sewer pipe (7) or pipe system or parts thereof as well as their access shafts (8), the present invention has set itself the task of providing devices (1) (4) and a method which meet these requirements.

Description

According to the invention, this task is achieved by horizontally or vertically coating (2) the insides of installed pipes (7) or pipeline networks or their shafts (8) with suitable liquid or pasty or powdery remediation agents which are applied by spraying or spinning (1) while an adjusted pressure (5) is maintained in the pipe or shaft. This adjusted pressure, which is approximately between 0.1 bar and 10 bar, is generated by compressors which, together with the control and regulation devices and the necessary tools and remediation material, are located in a remediation vehicle (9). The compressed air is fed to the constant pressure bladder (4) via suitable supply lines (13) and fed into the pipe (5). Any existing nozzles or branches and the opposite end of the section were previously closed using shut-off bladders (6) (Fig. 1). For the renovation of several pipes one after the other, only the shaft (8) between the pipes needs to be closed with a shut-off bladder (6) (Fig. 2).

When renovating a faulty shaft (8), all supply lines are closed with shut-off bladders (6). The upper shaft opening is also closed with a device designed as a constant pressure bladder (10). The shaft (8) is then put under pressure (5) and the wall (12) is coated (2) by the coating device (1).

The coating process can be carried out in several steps with different coating agents, different coating speeds and different prevailing pressures in the pipe or shaft (5). The prevailing pressure (5) can be reduced early if necessary or maintained until the repair agent hardens. These measures achieve a uniform coating thickness and the prevailing pressure (5) keeps out any foreign water penetrating and presses the coating material into the cracks and capillaries thus sealing and stabilizing the wall with pressure behind the damage.

4 pages in) drawings

Figure 1 shows a schematic representation of a sealing process (1)(2) of a Kngl tube (7) located between two access shafts (8), a so-called sealing.

Figure 2 shows a schematic representation of a sealing process (1)(2) of two slopes whereby an access shaft (8) located between the slopes was closed (6).

Figure 3 shows a schematic representation of a signaling device (l)(2) in an access shaft (8) with the inlets closed (6). The upper opening was closed with a cast device (10) similar to a lid, which contains the constant pressure bellows.

Figure 4 shows a schematic representation of a constant crutch bladder in longitudinal section.

1 shows a schematic representation of a feeding device

2 shows a schematic representation of a completed coating

3 shows a schematic of a supply or control power of the coating device

4 shows a schematic representation of a constant pressure bladder.

5 shows a schematic representation of the prevailing pipe or shaft internal pressure

6 shows a schematic representation of a shut-off valve

7 shows a schematic diagram of a defective Kngl tube

8 shows a schematic representation of an access shaft

9 shows a schematic representation of a signaling vehicle which contains all the necessary motors and techniques.

IQ shows a schematic diagram of a housing of the constant pressure bladder.

JJ. shows a schematic representation of a rubber arch around the constant pressure bladder

12 shows a schematic representation of the pipe or shaft foundation to be marked

J_3 shows a schematic representation of the supply and control lines of the constant pressure bellows.

14 shows a schematic representation of the constant pressure internal pressure of the bladder.

Jj) shows a schematic representation of the seal in the constant pressure bladder in relation to the supply voltage of the coating device

J_6 shows a schematic representation of the connection for generating the constant pressure internal pressure.

VZ shows a schematic representation of the connection for generating the pipe or shaft internal pressure.

18 shows a schematic representation of the connection for regulating the pipe or shaft internal pressure.

19 shows a schematic diagram of the connection for generating the internal pressure in the rubber gasket.

Claims (8)

Protection claims 1. A feeding device (1) which uses centrifugal force or pressure to project the remediation agent against the inside of the pipe or shaft (7),(8). 2. A feeding device (1) which carries the remediation agent in a container and brings it hydraulically, pneumatically or mechanically to the centrifuge or to the spray nozzle. 3. A feeding device which brings the remediation agent from an external container (9) hydraulically, pneumatically or mechanically through a hose-like line, the so-called product line (3) to the centrifuge (1) or spray nozzle. 4. A feeding device (1) which is pulled through the pipe (7) or shaft (8) using a rope, for example, or which is hydraulically, pneumatically or electrically driven and moves self-propelled through the pipe at the same or variable speed. 5. A feeding device (]) which applies the coating agent (2) while an adjusted (5) pressure prevails in the pipe (7) or shaft (8) which is maintained by the so-called constant pressure bladder (4j). 6. A constant pressure bladder (4) which essentially has a round or oval metal or plastic body (10) adapted in shape and size to the pipe (7) or shaft wall (12) to be renovated, which has an inflatable rubber sleeve (11) on the outside which is filled with air through an attached connection (19) and pressed against the pipe or shaft wall (12) to seal the pipe (7) or shaft (8) to be renovated from the environment. 7. A constant pressure bladder (4) according to claim 9, with which a prevailing gas or air pressure (5) generated in the pipe (7) or shaft (8) through a connection (18) can be controlled and, under certain circumstances, changed by means of one or more pressure control valves which are attached directly to the constant pressure bladder (17) or are connected to the constant pressure bladder via suitable lines (13). This control can be done either electrically from an operator panel or computer or manually (9). 8. A constant pressure bias (4) according to claim 9 and 10 through which, for example, a hose-like supply line (3) and other necessary lines or hoses can be moved while at the same time maintaining a constant pressure inside the pipe (5). This is achieved by adequate sealing measures (11)(15) against the outside and possibly an overpressure (14) prevailing inside the metal or plastic body (10) introduced through integrated filling openings (16).