WO2015001365A1

WO2015001365A1 - Thermoplastic pipe with reinforced spiral and it's production procedure

Info

Publication number: WO2015001365A1
Application number: PCT/HR2013/000020
Authority: WO
Inventors: Ante Vukovic
Original assignee: Ante Vukovic
Priority date: 2013-07-05
Filing date: 2013-07-05
Publication date: 2015-01-08
Also published as: HRPK20160073B3; HRP20160073A2

Abstract

The presently existing thermoplastic pipes with hollow corrugated spiral (A), when laid in water, require additional loading with weights in order to sink. This problem is solved by producing the thermoplastic pipe with reinforced spiral (B). Hollow corrugated spiral (2) is filled with mixture (4) that solidifies after being injected into the spiral. The spiral is reinforced with mixture of water and one of the following materials: cement, concrete, gypsum or another material, pumped with the pump (P) into the spiral. Once solidified in the spiral, the mixture cannot move circularly nor separate after cracking. Once the mixture appears at the opposite end of the spiral, injecting is stopped and the intake and outlet ends of the spiral are closed with plugs (5). The corrugated spiral can be filled with the mixture also through a number of auxiliary openings (6), and can have various outer shapes. Thermoplastic pipe with reinforced spiral (B) has significant advantages relative to thermoplastic pipe with hollow corrugated spiral (A): increased crown load capacity, decreased deflection, longer durability, increased specific gravity, better anchoring in water, decreased part of thermoplastic material relative to the total weight; it easily sinks in water with no additional weights; decreases the costs and time required for building of underwater systems.

Description

THERMOPLASTIC PIPE WITH REINFORCED SPIRAL AND IT'S PRODUCTION PROCEDURE

INVENTION DESCRIPTION

1. FIELD OF APPLICATION

The invention relates to production of thermoplastic pipe with reinforced spiral. In the International Patent Classification, it is classified as the Field F - Mechanical Engineering, Class F16 - Production procedure, Subclass F16L, that includes Pipes, Group F16L 11/11 - Pipes with corrugated wall.

2. TECHNICAL PROBLEM

Thermoplastic pipe with hollow spiral is produced from PE, PP and PVC materials, The specific gravity of such materials is lesser than that of water. This creates significant problems when such pipes are laid under water, because they do not sink but, because of their buoyancy, flow. In order to lay such pipes to their designed position under water they are to be provided with additional weights. This creates additional costs and takes additional time to be laid. Production of pipes of the same crown load capacity requires more material. A pipe of larger nominal diameter has a multilayered wall, wherefore the wall is thick and the pipe has a large total weight. All this has negative impact to the costs of building of underwater pipe systems by such pipes.

The technical problem solved by this invention relates to production of thermoplastic pipes the construction of which will enable their underwater laying without additional weights, hard enough, and enabling less costing underwater pipe systems. 3. STATE OF THE ART

In producing of thermoplastic pipes, of a larger diameter, a plastic pipe of a lesser diameter is wound around its outer shell, as reinforcement. The lesser diameter pipe's inner side is corrugated, and it is wound around the larger diameter pipe like a spiral. This increases the thermoplastic pipe crown load capacity, decreases its deflection, and increases the pipe material durability. All this does not suffice for the thermoplastic pipes to sink in water without adding extra weights.

The hollow corrugated reinforcing pipes may be of different shapes: circular, oval, square, rectangular or trapeze. The pipes for reinforcement may be fitted to the thermoplastic pipe outer shell as several rings or as a single spiral.

When such thermoplastic pipes are being laid in water, such as submarine discharges, their relative small weight requires production of weights usually made of concrete, that are fitted on the pipes to prevent their buoyancy, which increases the costs of such works.

Production of pipes of larger crown rigidity requires more material, applied in several layers, that requires more of both time and material, this again meaning larger production costs.

The costs of production of corrugated thermoplastic pipes, due to their small elasticity module, relative to pipes made of hard plastics, cast iron, concrete and ceramic, are larger.

4. DISCLOSURE OF THE INVENTION

The essence of the invention is thermoplastic pipe with reinforced spiral and the production procedure thereof.

In producing thermoplastic pipe with reinforced spiral it is used a thermoplastic pipe with a hollow corrugated spiral. To produce a thermoplastic pipe with reinforced spiral, a hollow corrugated spiral that is wound around the thermoplastic pipe is reinforced by being filled with a liquid mixture that solidifies shortly after being injected into the hollow corrugated spiral. To reinforce the spiral used are cement, concrete or gypsum mixed with water. The mixture is pumped into the hollow corrugated spiral. The mixture fills completely the corrugated spiral interior and does not allow circular movements once it solidifies or separation when the solid matter cracks. When the liquid mixture appears at the opposite end of the reinforced spiral, pumping is stopped, and both spiral ends are plugged. The corrugated spiral may be of circular, oval, square, rectangular or trapeze shape.

The above described procedure may also be applied to thermoplastic pipes of corrugated form and thermoplastic pipes with multiple ring reinforcements.

Thermoplastic pipe with reinforced spiral, when laid in water, sinks easily, requiring no additional weights, which significantly cuts the system building costs and time.

5. BRIEF ILLUSTRATION DESCRIPTIONS

Figure 1 shows thermoplastic pipe with hollow corrugated spiral and a cross- section detail through the corrugated spiral - front view.

Figure 2 shows the thermoplastic pipe shown in Figure 1 - top view.

Figure 3 shows the thermoplastic pipe shown in Figure 1 , cross-section X-X - top view.

Figure 4 shows the thermoplastic pipe after filling the corrugated spiral with the reinforcement mixture - front view.

Figure 5 shows the thermoplastic pipe after filling the corrugated spiral with the reinforcement mixture and a detail of the reinforced corrugated spiral cross- section - front view.

Figure 6 shows the thermoplastic pipe shown in Figure 5, cross-section Y-Y - top view.

Figure 7 shows the thermoplastic pipe shown in Figure 5, cross-section Z-Z - front view.

Figure 8 shows thermoplastic pipe with reinforced spiral - cross-section of the reinforced spiral ends plugged. Figure 9 shows thermoplastic pipe with reinforced spiral with two auxiliary plugged openings after the reinforcement mixture is injected into the spiral - front view.

6. DETAILED DESCRIPTION OF INVENTION EMBODIMENT AND

FUNCTIONING

The thermoplastic pipe is a pipe of a larger diameter, around its outer shell being wound a hollow corrugated plastic pipe of a lesser diameter, like a spiral. The lesser diameter corrugated spiral serves as reinforcement of the larger diameter thermoplastic pipe. The hollow spiral increases the thermoplastic pipe crown load capacity, decreases its deflection, and increases the pipe material durability. All this does not suffice the thermoplastic pipes to sink in water without adding extra weights.

The hollow corrugated pipes for reinforcement of the thermoplastic pipe may be of different outer shapes: circular, oval, square, rectangular or trapeze. In order to reinforce the thermoplastic pipe, to the thermoplastic pipe outer shell may be fitted several rings.

Here, as an example, is presented a thermoplastic pipe with hollow corrugated spiral of circular shape.

Procedure of production of thermoplastic pipes with reinforced spirals

In producing the thermoplastic pipe with the reinforced spiral B, it is used the thermoplastic pipe with the hollow corrugated spiral A.

Figures 1 and 2 show the thermoplastic pipe with the hollow corrugated spiral A, front and top view. Around the outer shell 1 of the thermoplastic pipe is wound the hollow corrugated spiral 2, its inner shell having circular corrugations 3. Figure 3 shows cross-section X-X of the thermoplastic pipe with the hollow corrugated spiral.

The thermoplastic pipe with the reinforced spiral B, Figures 4, 5, 6, 7 and 8, is produced by filling the hollow corrugated spiral 2, that is wound around the thermoplastic pipe with the hollow corrugated spiral A, with the liquid mixture 4. Production of thermoplastic pipe with reinforced spiral comprises the following operations: preparation of the reinforcing mixture 4, injecting the mixture 4 into the hollow corrugated spiral 2 with the pump P that is connected to the intake end of the hollow corrugated spiral, and closing the reinforced spiral intake and outlet ends with the plugs 5 once the hollow corrugated spiral 2 is filled with the mixture 4. During injecting, the outlet end of the hollow corrugated spiral 2 is left open, so that the mixture can force all the air from the spiral out.

To reinforce the hollow corrugated spiral 2, used are mixtures of different materials that solidify after a shorter period of time. In reinforcing used are mixtures made of cement, concrete, gypsum or another material, mixed with water. The prepared mixture 4 is to be liquid to be more easily pumped with the pump P into the hollow corrugated spiral 2, Figure 4. Parts of material and water in the reinforcement mixture are determined empirically, to enable the mixture 4, before solidifying, to completely fill the circular corrugations 3 in the hollow corrugated spiral 2. This prevents circular movements of the solid matter once it solidifies and separation of the solid matter when it cracks.

When the liquid mixture 4 appears at the opposite end of the hollow corrugated spiral, Figure 4, pumping of the mixture is stopped, and the reinforced spiral intake and outlet ends are closed with plugs 5 or welded with the same material, as shown in the Figure 8.

Figure 5 shows the thermoplastic pipe with the reinforced spiral B, front view and partial cross-section of the reinforced spiral 2. Figure 6 shows cross-section Y-Y from Figure 5, through the thermoplastic pipe with reinforced spiral B.

If the thermoplastic pipe and the hollow corrugated spiral are of greater lengths, along the corrugated spiral 2 may be made several auxiliary openings 6 for injecting the reinforcing mixture 4 by segments, Figure 9. This guarantees better filling of the circular furrows 3 inside the spiral. Once the mixture is injected, all auxiliary openings are to be closed.

The above described procedure may be applied also to thermoplastic pipes with several ring reinforcements. In thermoplastic pipes with separate rings, the reinforcement procedure is more expensive, since intake and outlet openings are to be made in each and every ring separately.

The thermoplastic pipe with reinforced spiral B has significant advantages relative to the thermoplastic pipe with hollow corrugated spiral A.

The above described procedure of production of the thermoplastic pipe with the reinforced spiral B significantly increases the pipe crown load capacity and decreases its deflection, which is very important in lying of duct piping systems. The thermoplastic pipe durability is increased, and the mixture used for reinforcing the corrugated spiral increases the specific gravity and enables better sinking of the thermoplastic pipe in water. Reinforcing the spiral enables significant decrease of quantity of the thermoplastic material used in the total weight of the thermoplastic pipe with reinforced spiral. Reinforcing the hollow spiral with low costing materials and decreasing quantity of the thermoplastic material used, significantly contribute to decreasing participation of costs of the thermoplastic material in the total cost of the thermoplastic pipe with the reinforced spiral B.

When laid in water, the thermoplastic pipe with the reinforced spiral B sinks easily, without any additional weights, which significantly decreases the underwater system building costs and time.

REFERRAL MARKS USED IN INVENTION DESCRIPTION AND ILLUSTRATIONS

A - thermoplastic pipe with hollow corrugated spiral

1 - thermoplastic pipe outer shell

2 - hollow corrugated spiral

3 - inner circular corrugations of the spiral

4 - mixture for reinforcing the hollow corrugated spiral

5 - plug closing the spiral intake and outlet openings

6 - closed auxiliary openings in the spiral after injecting the mixture

P - pump

B - thermoplastic pipe with reinforced spiral 7. INVENTION APPLICATION

The thermoplastic pipe with the reinforced spiral B has a very wide application. Due to its fine mechanical, hydraulic, chemical and thermal properties and its durability, it is applied in drainage, sewage and water transportation in:

- underwater discharges,

- trenches with or without underground water,

- retentions, underground and surface tanks, control manholes and underground chambers, and

- water-transporting ducts of all kinds.

The thermoplastic pipe with the reinforced spiral B sinks in water without being loaded with additional weights, which facilitates it's lying and cuts the costs of building of water systems.

Claims

PATENT CLAIMS

1. Thermoplastic pipe with reinforced spiral, w h e r e i n in production of the thermoplastic pipe with reinforced spiral B it is used a thermoplastic pipe with hollow corrugated spiral A; a hollow corrugated spiral (2) is reinforced with liquid mixture (4) that solidifies after being injected into the corrugated spiral (2).

2. Thermoplastic pipe with reinforced spiral, as claimed in Claim 1 , w h e re i n the hollow corrugated spiral (2) is reinforced with the mixture (4) obtained by mixing water and one of following materials: cement, concrete, gypsum or another material of similar properties; parts of the material and water in the mixture are determined empirically to enable the mixture (4), before solidifying, to completely fill inner circular corrugations (3) in the hollow corrugated spiral (2).

3. Thermoplastic pipe with reinforced spiral, as claimed in Claim 1 , w h e r e i n the hollow corrugated spiral (2) may be of various outer shapes: circular, oval, square, rectangular or trapeze.

4. Procedure of producing the thermoplastic pipe with reinforced spiral, as claimed in Claim 1 , w h e re i n it comprises following operations: preparation of the reinforcing mixture (4); injecting the mixture (4) into the hollow corrugated spiral (2) with a pump (P) that is connected to intake end of the hollow corrugated spiral (2), while outlet end of the hollow corrugated spiral is left open; closing the reinforced spiral intake and outlet ends with plugs (5) once the hollow corrugated spiral (2) is filled with the mixture (4).

5. Thermoplastic pipe with reinforced spiral, as claimed in Claim 1 , w h e r e i n along the hollow corrugated spiral (2) of greater length are made a number of auxiliary openings (6) for injecting the mixture (4), which guarantees better filling of corrugations (3) inside the spiral, the auxiliary openings (6) are to be closed once the hollow corrugated spiral (2) is filled with the mixture (4).

6. Thermoplastic pipe with reinforced spiral, as claimed in Claim 1 , w h e r e i n it is of significantly increased crown load capacity, decreased deflection, longer durability, increased specific gravity, better anchoring in water, decreased part of thermoplastic material relative to total weight; it easily sinks in water with no additional weights; the thermoplastic pipe with reinforced spiral B decreases the time required for building of underwater systems.