LT4979B - Repair method of underground pipes - Google Patents

Abstract

Invention is intended for repair and renovation of worn-out engineering networks, canalisation, and other underground or underwater pipes. Worn-out underground pipes repair mode includes the estimation of the geometric data of repaired pipe and the insertion of correspondingly adjusted pipe into the repaired underground pipe. The novelty is the insertion of continuous pipe along all the length of the repaired pipe, between two inspection shafts. The inserted pipe is supplied to the lower part of first inspection shaft by the sloping micro-tunnel and is dragged towards the second inspection shaft until it completely fits within the repaired pipe among two inspection shafts.

Description

The invention relates to the repair of engineering networks, sewers and other underground or underwater pipes, in particular to the repair of worn out pipes.

There is a known method of repairing inaccessible underground or submersible pipes by introducing into the repaired interior of the pipe a device that carries an insulating gasket and an insulating material sprayer and video camera. The camcorder detects a fault where it places an insulating gasket of smaller diameter than the tube being repaired and sprays the resulting gap between the repaired tube and gasket with insulating material (see German Patent No. 4409886, ON: E03F 3/06 ONLY).

A known method of repairing inaccessible pipes is suitable for repairing underground pipes where unit failures occur. This method requires expensive equipment and is not suitable when the pipe is completely worn out and needs to be replaced.

There is a known method of repairing inaccessible underground pipes, which includes inspection of the pipe being repaired, such as a video camera, detecting the cross-sectional data of the pipe being repaired, its surface changes, etc., converting the determined data into appropriate digital signals said part being formed by bending a sheet of non-woven material, a tube adapted to the cross section and length of the reconstructive part of said tube, then inserting the formed tube of non-woven material into the interior of said part of the tube and stiffening it (see WO9810148 ).

The method described is complicated, requires expensive equipment to implement, and is not suitable for the repair and refurbishment of worn long pipes.

The purpose of the invention is to simplify and reduce the cost of repairing and renewing worn long pipes.

The essence of the problem is that in a method of repairing an underground pipe, comprising determining the geometrical data of the pipe being repaired and introducing the appropriately adjusted pipe into the pipe under repair, it inserts a continuous pipe into the inside of the underground pipe between two inspection wells. which is fed into the lower portion of the first inspection well by a sloping microtunnel, and the front end of the inlet pipe is pulled by a device in the direction of the second inspection well until a continuous inlet pipe is placed between said wells inside the repairable pipe.

The proposed method of repairing underground communication pipes is cheap as it does not require complicated equipment and high labor costs. Insertion of a continuous pipe by a sloping microtunnel into repairable pipes is particularly convenient in urban conditions, since this does not damage vegetation, pavements or other structures in the pipe pipe environment without interrupting traffic, since the formation of a sloping microtunnel does not require trenching cost and would cover a large area of land. In addition, the repair method of inserting a worn pipe into a worn new pipe is reliable and does not require any additional repair work.

The slope angle α of the inclined microtunnel feeding the inlet pipe to the first inspection well is given by the formula tg a> H / 2.5 L, where L is the distance between the start of the microtunnel drilling and the first inspection well and H is the height of the first inspection well.

This condition allows a long continuous new pipe to be inserted into the repair pipe and ensures a good passage through the microtunnel.

The inclined microtunnel, designed to enter a continuous tube, is formed by a horizontal controlled drilling device, while simultaneously introducing a mixture into the drilling area, reducing drilling resistance and improving soil drilling conditions.

This does not require the use of special equipment to form a microtunnel, but allows the use of known drilling equipment.

The diameter of the sloping microtunnel is slightly larger than the diameter of the inlet pipe.

The microtunnel is formed in two stages, the first stage forming the primary (pilot) cavity of the microtunnel in a linear direction in a defined direction, the second stage expanding the formed primary microtunnel cavity in a reversible motion.

The inlet pipe has a bend radius of 15 ° to 60 °. This condition allows the insertion of a sufficiently long continuous tub (up to 300 m) made of various plastic and metal materials.

Introduced through a sloping microtunnel, the front end of the continuous tube is pulled by a rope with a pulling mechanism mounted above the second inspection well.

The rope for pulling the continuous pipe is fed from the second sighting well through the pipe to be refurbished to the bottom of the first sighting well, where it attaches the wire to the drill rods along with the expansion head and pulls the wire back into the feed pipe end.

DETAILED DESCRIPTION OF THE INVENTION In the drawings, where:

Fig. 1 is a schematic view of a device implementing a microtunnel distribution and rope retraction step.

Fig. 2 is a schematic view of the apparatus implementing the tube insertion step through a sloping microtunnel.

The proposed method of repairing underground pipes involves this sequence of actions. Determines the geometry of the pipe being repaired. Selects a continuous pipe, which will be introduced into the interior of the pipe to be repaired along its entire length between the two wells for inspection, according to the geometric data determined. Horizontal guided drilling unit forms a primary (pilot) sloping microtunnel contacting the lower portion of the first observation tunnel. The slope of the microtunnel is selected according to the formula tg a> H / 2.5 L, where L is the distance between the start of drilling the microtunnel and the first inspection well, and H is the height of the first inspection well. From the second viewing tunnel, a pull rope is fed through the repair pipe to the first viewing tunnel. The drill unit simultaneously executes, in a reciprocating motion of the drill, a microtunnel distributed up to a diameter slightly larger than the suction tube and the rope being pulled to the surface. On the surface, the end of the pulling rope is coupled to the front end of the intake continuous tube and the pulling mechanism located above the second inspection well pulls the tube through the inclined microtunnel until it is fully seated, then releases and pulls the cable away from the end of the tube.

The device comprises a first view well 1, a second view well 2, a horizontal guided drill 3, with a drill head (not shown) for forming a primary microtunnel 4 and an expansion head 5 for widening the primary microtunnel 4 cavity to a cross-section slightly larger than the cross-section of the inlet pipe 6. The bending radius of the inlet pipe is selected between 15 ° and 60 °. The drilling device 3 is located at a distance from the first inspection well, ensuring that the slope angle α of the forming microtunnel 4 is within the range tg a> H / 2.5 L, where L is the distance between the start of the microtunnel drilling and the first inspection well 1 and H height of inspection well. A cobra rope pulling device for fiberglass rope 7 is arranged at the first inspection well 2. A hydraulic tensioning mechanism 9 is provided with the second inspection well 2 having a rope wrapped on the reel 10. A coupling nozzle is attached to the front end of a retractable, e.g. 11. The repairable tube 12 is located between the first view well 1 and the second view well 2. The expansion head 5 widens the cavity of the microtunnel 4 to a final microtunnel diameter 13 suitable for tube delivery.

The proposed pipe repair is done this way. Horizontal guided drilling device 3, drilling head drills a sloping primary (pilot) microtunnel 4 having a slope angle α, depending on the inlet pipe flexibility, selected from the formula tg a> H / 2.5 L, where L is the distance between the microtunnel drill start and 1 is the first inspection well and H is the height of the first inspection well. During drilling, a concrete mix is added to the borehole area, which reduces drilling resistance and improves drilling conditions. From the spool of the hydraulic tensioner 9, a tensile rope 10 is unwound and lowered to the bottom of the second viewing well 2. By means of the cobra slitting device 8, the fiberglass rope 7 is passed through a repair tube 12 to the bottom of the second viewing well 2, where the rope 7 is attached to the end of the pulling rope 10. The device 8 passes the rope 10 through the repair pipe 12 to the first inspection well 1. The expansion head 5 is then fitted to the drill rods in place of the drill head pilot and secured to the end of the pull rope 10. During the reverse movement of the drilling device 3 towards the ground, the microtunnel 4 is extended by the expansion head 5 to the required diameter 13 for extending the tube 6, along with the extension 10 of the cable 10 Next, the rope 10 is pulled by the mechanism 9 towards the second viewing well and then enters itself through the microtunnel cavity 13 into a new tube 6 over its entire length 12. 13 filling the ground and tidying up the environment.

Claims (8)

DEFINITION OF INVENTION. 1. A trenchless trench repair method, comprising determining the geometry of the pipe to be repaired and introducing a properly aligned pipe into the underground repair pipe, characterized in that a continuous pipe is inserted into the underground pipe between two inspection wells to be repaired. which is fed into the lower portion of the first inspection well by a sloping microtunnel and is pulled by a device in the direction of the second inspection well until the insertion continuous tube fits between said wells inside an easing repair pipe. 2. A method according to claim 1, characterized in that the inclination angle α of the inclined microtunnel at which the feed tube is fed is selected from the formula tga> H / 2.5L, where L is the distance between the start of microtunnel drilling and the first inspection well and H is the first height of inspection well. 3. A repair method according to claim 2, characterized in that the inclined microtunnel for introducing the continuous tube is formed by a horizontal controlled drilling device, while simultaneously introducing a mixture of materials reducing the drilling resistance and improving the ground drilling conditions into the drilling area. 4. A method according to claims 1-3, wherein said sloping microtunnel has a diameter slightly larger than the diameter of the inlet pipe. 5. A method according to claim 4, characterized in that the microtunnel is formed in two steps, the first step forming the primary (pilot) cavity of the predetermined slope microtunnel in a linear motion, the second step drilling the head of the formed microtunnel in reverse motion. 6. A method according to claims 1-5, characterized in that the inlet pipe has a bending radius of 15 ° to 60 °. Ί 7. A method as claimed in claims 1 and 6, characterized in that the leading end of the continuous tube is drawn through a sloping microtunnel by means of a rope having a pulling mechanism mounted above the second inspection well. 8. A method as claimed in any of claims 1 to 7, wherein the rope for pulling the continuous pipe is introduced from the second sighting well through the pipe being repaired into the lower part of the first sighting well, where it attaches to the drill rods along with the expansion head it is pulled to the surface and attached to the end of a continuous pipe.