FI123950B - Method for local repair of ducts and corresponding use - Google Patents

Description

METHOD FOR LOCAL REPAIR OF CHANNELS AND SIMILAR USE

The invention relates to a method for local repair of internal ducts of structural elements, wherein the method comprises locating a local duct defect and performing a repair of the duct defect. The invention also relates to a corresponding use.

In construction engineering, especially for the construction of large buildings 10, prefabricated concrete elements are often used, which are assembled into a complete building on the site. Such concrete elements can be used to make wall and floor structures throughout the building. Thus, for example, ventilation ducts are installed inside the concrete elements already during the casting stage of the elements. When installing the concrete ducts, the connection between the internal ducts of the concrete element is placed. However, during the installation phase, the handling of the concrete elements is difficult and the joints and even the ventilation ducts easily cause cracks, dents or other damage at the seam points of the concrete elements 20. Damage occurs especially in the vertical installation of concrete elements. In addition, there are so-called ELPO chimneys, which, in addition to the IV channel, have all the water pipes, heating pipes, sewers, ventilation ducts and plumbing for electrical and telecommunications cables needed in the building. 25

Damage in the air ducts and joints can 'cause leaks in the air duct and over the years 0 01, for example, dents easily collect dirt and other impurities on their surface. These impurities can in turn be beneficial

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f-30 medium for mold or may cause other indoor air problems.

00 J Ventilation ducts generally inside concrete elements

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ς the damage has been repaired by mocking the concrete layer surrounding the air conditioning en 35 ducts, after which it has been possible to repair the dam ventilation duct. A new concrete layer is then poured over the repaired ventilation duct.

2 However, this type of repair technology is very laborious and slow, which causes additional costs for the construction project. In a single apartment building, there may be fifty junctions between the ventilation ducts between the concrete elements, so that the amount of damage 5 can easily increase as well.

US 2008/0193221 A1 is known in the art for repairing underground water pipes, which discloses a method by which a water pipe can be repaired without digging the pipe from the ground. A similar solution is also known from AT 000438 UI.

The object of the invention is to provide a faster and easier method for the local repair of the internal ventilation ducts of the structural elements than the prior art solutions. Characteristic features of the method of the present invention are apparent from the appended claims 1. It is also an object to provide a new use for the prior art sewer repair device. Characteristic features of the use of the present invention will be apparent from the appended claim 9.

The object of the method according to the invention can be achieved by a method for the local repair of internal ducts of structural elements, which method locates 25 local ducts of a duct and performs a

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T-channel damage repair. Repairing the damage to the ventilation duct o, is performed by moving the repair device to the sealing sleeve O)? with damage to the duct and repair unit

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expanding the ventilation duct radially around it

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g 30 to seal the sealing sleeve against the ventilation duct to repair the damage. The sealing sleeve is locked in its extended S shape against the ventilation duct at the point of damage and repaired

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o the unit is removed from the ventilation duct. With such a method,

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this avoids the dismantling of the solid structures of the structural element, i.e., for example, in the concrete elements by piercing the concrete to repair the damage to the ventilation duct. This in turn 3 significantly speeds up and facilitates the repair of air duct damage. In this context, defect repair means straightening and / or sealing of the defect.

Preferably, the repair device comprises a cylinder into which compressed air is directed to expand the cylinder. The pneumatic expandable cylinder is inexpensive to manufacture and easy to use.

Preferably, a layer of adhesive is applied around the sealing sleeve to adhere the sealing sleeve to the wall of the ducting in its expanded form. The sealing sleeve and the adhesive allow the seal to be sealed and the sealing sleeve to support the site of damage.

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Preferably, the adhesive layer is allowed to dry for at least ten minutes after compression of the sealing sleeve prior to use of the duct.

Preferably, the method will repair damage to the joint joints to be installed in the seam between the ventilation ducts of the two structural elements. Damage to the joints is common when installing concrete elements, so repairing them by the method of the invention is particularly profitable.

25 co ^ Preferably, the sealing sleeve is locked in its extended shape by means of locking means included in the sealing sleeve for the automatic en? as the cylinder expands. Thus, the sealing sleeve is also mechanically locked against the wall of the ventilation duct, in addition to gluing x £ 30, co t} · io According to one embodiment, the method is used for

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δ between the ventilation ducts between the elements in the connection

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to repair existing damage.

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The locking means may include apertures and serrations which enter into the apertures to lock the sealing sleeve. Such locking is very simple and reliable.

The method can be used for ventilation ducts having a diameter of 50 to 1500 mm, preferably 100 to 1000 mm. The method is suitable for use in most of the internal ventilation ducts of the structural elements.

Preferably, the locking means include apertures and serrations which are arranged in movable apertures to lock the sealing sleeve.

The use of the invention can be accomplished by the use of a drainage repair device. The repair device includes a remote-controlled wheeled carriage adapted to be placed inside the air-conditioning duct, and a compressed air cylinder extending in the radial direction of the air-conditioning duct. Further, the repair device includes a sealing sleeve disposed around the cylinder 20 comprising dental locking means and means for supplying compressed air to said cylinder. The repair device is used in the use of the invention to repair the internal ventilation duct of the structural elements. It is surprising that a drainage repair device 25 is also used to repair vertical air conditioning> ducts.

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σ>? The invention will now be described in detail with reference

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to the accompanying drawings illustrating some embodiments of the invention, x £ 30 where 00 ld Figure 1 illustrates, in principle, the first step of the method of the invention in which the correction device

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is placed in a repair duct, Fig. 2 is a schematic view of the second step of the method of the invention, wherein the repair device is moved in a repair duct to a duct defect,

Figure 3 is a schematic view of a third step of the method of the invention, wherein the repair device is in a repairable air duct at a condition of the air duct failure,

Fig. 4 is a schematic view of a fourth step of the method of the invention, wherein the damage to the repaired duct is repaired by blowing up the cylinder with compressed air,

Figure 5a is a side elevational view of an embodiment of the method of the invention, Figure 5b is an axonometric view of an embodiment of the method of the invention;

Fig. 6b is a perspective view of the sealing sleeve of the method of the invention.

Figure 1 is a schematic view of the first step of the method of the invention, wherein the repair device 16 of the repair means is placed in a duct 12 of a concrete element 36 to be repaired. This step is always preceded by a description of the ducts.

Generally, the damage to the ventilation duct is located at this point, ^ ^ When the location of the damage is known, the repair device 16 is placed ^ in the ventilation duct 12 as close as possible to the damage 14.

Oh? The damage 14 is generally located between the two concrete elements 36 in the joint 50 at the seam 60, but the method x £ 30 can also repair the damage oo in the middle of the single concrete element. The purpose of the joint 50 is to serve as an air conditioning connecting part of the channels 12 between the concrete elements 36

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δ at seam 60. The junction 50 extends slightly over both

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inside the ventilation ducts 12 of the concrete elements 36. In general, for the ventilation ducts 12, the concrete elements 36 have a plurality of service hatches 42 through which the connection to the duct 6 12 is provided. In this case, the repair device 16 is inserted into the air conditioning duct 12

The method of the invention for repairing air duct damage 5 includes a repair device 16, which in turn includes a wheeled carriage 30 as shown in Figures 5a and 5b; 34 for supplying compressed air 10 to cylinder 20. The carriage 30 may be remotely controlled and preferably includes a camera capable of guiding it to the failure of the ventilation duct. The carriage 30 includes wheels 40 and a frame 44. Preferably, at least three wheels at each end are uniformly distributed such that, for example, three wheels 15 are distributed over a circular cross section of the ventilation duct up to 120 ° sectors supporting the carriage in the ventilation duct. In the carriage 30, supported by the body 44, there is a pneumatic, preferably elastic, cylinder 20, around which the sealing sleeve is positioned to wait for its attachment to the damage to the ventilation duct 20. The sealing sleeve 18 includes locking means 32 according to Fig. 6a, by means of which the sealing sleeve 18 is mechanically locked in the shape of a diameter of the ventilation duct.

Figure 2 shows a second step of the method in which the carriage 30 of the repair device 16 is driven to the damage 14 of the connection duct 50 of the ventilation duct 12. Damage here means o? in connection with rotten, dent, hole, crack or other similar co that needs to be straightened and / or sealed. Korjauslaittee-

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The £ 30 can include a small electric motor to move the car oo forward through the air duct. Alternatively, the trolley of the repair device S may also be pulled by a rope through the service hatch of another ventilation duct C10, or lowered by gravity in the vertical direction.

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2. The means 34 for supplying the compressed air 35 to the cylinder 20 may be, for example, compressed air hoses. Both electric and compressed air hoses can be assembled into a single 7 flexible hose. If the hose is sufficiently rigid, the carriage can also be pushed through the ventilation duct using the hose.

If the damage in the ventilation duct is so large that the carriage 5 is not suitable to pass over it, the carriage may be attempted to push the air duct wall straight at the point of the damage. Alternatively, a smaller trolley without a sealing sleeve may be used initially, whereby the air channel wall is straightened at the point of damage only by expanding the cylinder with compressed air. Generally, the walls of the ductwork and the joint are a thin sheet of only about 0.5-1 mm in thickness, which easily bends back to its original shape.

Fig. 3 is an enlarged plan view of the situation 15 in which the carriage 30 of the repair device 16 is driven to the defect 14 of the connection duct 50 of the ventilation duct 12. In this example, the lesion 14 is a dent in the connection duct 50 of the ventilation duct 12, which narrows the duct 12 at the lesion 14. The carriage 30 is moved to the site of the damage 14 such that the cylinder 20 and the sealing sleeve 20 18 cover the damage 14. If the damage is longer than the sealing sleeve or cylinder, the cylinder may be used several times to straighten the damage. If the crack or hole is wider than the sealing sleeve, several sealing sleeves may be installed in succession.

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Fig. 4 illustrates a fourth step of the process in which the cylinder 20 is filled with compressed air. The cylinder 20 then expands in the radial direction of the air channel 12 while pushing the sealing sleeve 18 wider, which further pushes the damage 14

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At £ 30 (Figure 3), 50o of the junction 50 of the air duct 12 is straight against the wall 22 of the air duct 12. At the same time, the sealing sleeve 18 of the LO is locked by its locking means 32 in its widest shape to support the junction 50 of the ventilation duct 12 at the damaged 14 '. The air pressure required to expand the cylinder 35 may be, for example, 1-8 bar, preferably 2-4 bar.

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Preferably, the locking means 32 of the sealing sleeve 18 may be for example the teeth 28 of Fig. 6a and the corresponding openings 26 which allow the sealing sleeve 18 to be easily expanded to conform to the shape of the cross-section of the ventilation duct 12. At the same time, the teeth 28 and openings 26 prevent the sealing sleeve 18 from narrowing back. In other words, the locking means may function as cable ties, but vice versa. The sealing sleeve may be 0.5 to 4 mm thick, preferably 1.0 to 2.5 mm thick, preferably stainless steel. Figure 10 6b shows the sealing sleeve 18 as a whole. The locking means 32 are preferably at both ends a sealing sleeve, whereby the locking becomes secure.

Advantageously, in addition to the locking means, an adhesive layer may be applied around the sealing sleeve 15 by means of which the sealing sleeve is glued to the wall or joint of the ventilation duct.

The adhesive may be, for example, a two-component adhesive which also cures rapidly under humid conditions. For example, the adhesive layer may have a thickness of two millimeters. The curing of the adhesive 20 preferably takes about two hours, whereas the installation of the sealing sleeve may take only ten minutes in its entirety. During the transfer of the carriage, the surface of the sealing sleeve is detached from the wall of the ventilation duct and the joint, so that the adhesive layer remains intact until the cylinder 25 is expanded with compressed air, co δ, When the sealing sleeve is glued to at the junction, the wagon is moved back to the air duct

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service hatch and removed from the duct. Checking of the ventilation duct x £ 30 can be performed as soon as the adhesive layer co dries.

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The method according to the invention is applicable to a variety of prefabricated-

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repair of internal ventilation ducts in the 35 building sites. The internal ventilation ducts of the elements refer to the ventilation ducts covered by different structures. The diameter of the ventilation duct can vary from 100 to 1300 mm, but preferably from 100 to 1000 mm. Due to the rigid structure of the trolley, the method can only be used for substantially straight sections of the ventilation duct 5, since the trolley cannot pass through bends. The ventilation duct may have a cross-section, a rectangular section or the like, whereby the expanding part of the repair device must also be shaped such that the sealing sleeve can be pressed to correspond to the duct cross-section. Alternatively, expansion 10 for compressed air can also be achieved by, for example, moving some conical part by means of an electric motor.

For example, in the process of the invention, sewer repair equipment and related accessories marketed by 15 German manufacturers KDT-Kanaltechnik under the brand name INSIDER® can be used. In the use according to the invention, the device in question is used for the local repair of the internal ventilation ducts of the structural elements.

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Claims (8)

A method for local repair of ducts, according to which the local duct (12) damage (14) is located and the repair of duct (12) damage (14) is carried out in the following steps: a sealing bush (18) equipped with a repair device (16) ) is moved to the damage (14) in the channel (12), the repair device (16) is expanded in the radial direction of the channel (12) to press the surrounding sealing bush (18) against the channel (12) for repair of the damage (14), the sealing bush ( 18) is read in its expanded form towards the duct (12) at the location of the damage (14), the repair device (16) is moved out of the duct (12), characterized in that the ducting ducts (12) are repaired inside the building element. Method according to claim 1, characterized in that the repair device (16) comprises a cylinder (20), in which compressed air is conducted for expansion of the cylinder (20). Method according to claim 1 or 2, characterized in that a glue layer (18) is applied around the sealing bush (18) to bond the sealing bush (18) to the wall (22) of the ventilation duct (12) in its expanded form, co δ c 4. A method according to claims 1-3, characterized in that, with the method, damage is repaired in connection terminals CD (50) mounted in the joint (60) between two building elements x 30 ventilation ducts (12). co LO Method according to claims 1-4, characterized in that the δ sealing bush (18) is read automatically in its expanded form CM by means of reading means (32) included in the sealing bush (18) as the cylinder (20) expands. Method according to any of claims 1-5, characterized in that the method is used for ventilation ducts (12), the diameter of which is 50 - 1500 mm, presumably 100 - 1000 mm. Use of a repair device intended for the repair of sewage pipes, which repair device (16) comprises a remote-controlled carriage (30) which likes wheels, arranged to be placed inside the ventilation duct (12), a cylinder (20) which is expanded with compressed air, aboard the said carriage (30), a sealing bush (18) located around the cylinder (20) comprising tooth-shaped reading means (32), and means (34) for conducting compressed air to said cylinder (20), characterized in that said repair device (16) is used to repair internal ventilation ducts (12) in building elements. 20 8. Use of an equipment intended for repair of sewage pipes according to claim 7, characterized in that said repair device (16) is used to repair internal ventilation ducts (12) in concrete elements (36). co δ c \ j i O) o CD X cc CL CO 't LO C \ 1 O C \ 1