FR2958203A1 - Facility for interior coating of body of base of pipe element e.g. wastewater pipe, has feeding device, whose dry matter outlet leads into dry matter inlet of mixing chamber, where mixing member and feeding member are separate members - Google Patents

Abstract

The facility (30) has a feeding device (32) e.g. screw conveyor, including a feeding chamber (48) and a dry matter feeding member (54) arranged in a feeding chamber. The feeding chamber is provided with a dry matter inlet (50) and a dry matter outlet (52). A mixing device (34) mixes the dry matter with liquid matter to obtain mortar. The dry matter outlet of the feeding device leads into a dry matter inlet of a mixing chamber, where the feeding member and the mixing member are separate members.

Description

Installation of lining of a pipe element and corresponding use

The present invention relates to an installation, adapted for the internal lining of a pipe element by a mortar, comprising - a conveying device which is adapted for conveying the dry materials from the mortar, the routing device comprising a chamber of routing and a dry material delivery member disposed in the conveying chamber, the conveying chamber being provided with an inlet of dry matter and an outlet of the dry materials. Known in the state of the art pipes for transporting wastewater. These pipes comprise a metal base body on the inner surface of which is applied an inner coating capable of withstanding water having a pH of between 4 and 13. The coatings generally used comprise a cement mortar.

An installation for making such a pipe is described in WO95 / 01830. The installation comprises a tube inside which the dry materials, made of cement and a mineral filler (sand), are mixed. A tubular member introduces water into the tube and a coil spring mixes dry matter and water forming a mortar. A projection baffle is placed at the end of the coil spring and distributes the mortar on the inner surface of the pipe. The object of the invention is to provide an installation which makes it possible to improve the mixing of the mortar components and which allows a controlled application of the mortar on the inner surface of the base body of a pipe element such as a pipe or a pipe. connection.

For this purpose, the object of the invention is an installation of the aforementioned type, characterized in that it comprises: a mixing device adapted for mixing the dry materials with liquid materials in order to obtain the mortar, this mixing device having a mixing member and a mixing chamber of the solids with the liquids, said mixing chamber having a solids input, an inlet of the liquids and a mortar outlet; and in that the outlet of the dry materials of the conveying device opens into the inlet of the dry materials of the mixing chamber, and in that the conveying member and the mixing member are separate members.

According to particular embodiments, the installation according to the invention comprises one or more of the following characteristics: the routing member defines an axis (A2) and the mixing member defines an axis (B2) and the conveying member and the mixing member are axially spaced from one another forming an axial gap (EC); the conveying member is a screw and / or the mixing member is a screw; - The conveying member is a screw and the mixing member is a screw, and the screws having screw threads (P1, P2) and / or outer diameters (D1, D2) different; the conveying chamber defines a chamber axis (Al) and the mixing chamber defines a chamber axis (B1) and these chamber axes are arranged coaxially with one another; the conveying chamber and the mixing chamber have different cross-sections from one another, and in particular the cross-sectional area of the conveying chamber is larger than the cross-sectional area of the mixing chamber; - a first drive motor adapted to drive the routing member and a second drive motor adapted to drive the mixing member; the conveying member has a driving side and a free side and the mixing member has a driving side and a free side, and the two free sides being adjacent to each other, and in particular both sides free being directed towards each other; a projection head adapted to project the mortar, the projection head having a head inlet into which the mortar outlet opens, and at least one projection window of the mortar; and - the or each projection window has a general shape of triangle or quadrilateral; - The conveying device is a mixing device which is adapted to mix at least a first dry component and a second dry component; a device for supplying liquid materials suitable for introducing the liquid materials into the dry materials, in particular the device for supplying the liquid materials comprising a device for introducing a first liquid component and a device for introducing a second component liquid; and the device for introducing the first liquid component and the device for introducing the second liquid component are adapted to introduce the first liquid component and the second liquid component separately from one another; and - the or each liquid component introduction device being adapted to introduce the liquid component concerned into the dry matter in a direction having a component perpendicular to the direction of transport (T) of the load or in a direction perpendicular to this direction transport (T).

The invention further relates to a use of an installation as aforesaid for internally coating the base body of a pipe element with a mortar coating. The invention will be better understood on reading the description which follows, given solely by way of example and with reference to the appended drawings, in which: FIG. 1 is a longitudinal sectional view of a pipe manufactured by an installation according to the invention; - Figure 2 is a schematic view of a coating installation of a pipe according to the invention; Figure 3 is an enlarged view of detail III of Figure 2; Figure 4 is an axial view of the projection head of the installation of Figure 2; Figure 5 is a cross-sectional view of the projection head of Figure 4; and FIG. 6 is a developed view of the enveloping surface of the projection head of FIG. 5. FIG. 1 shows a pipe that can be manufactured by the installation according to the invention, designated by the general reference 2. This pipe 2 extends along a central axis XX. In what follows and unless otherwise indicated, the terms "axially", "radially" and "circumferentially" will be used with respect to the central axis X-X. The pipe 2 comprises a spigot end 4, an interlocking end 6 and an intermediate part 8 extending between the spigot end 4 and the interlocking end 6. The pipe 2 is provided with a base body 10, manufactured for example cast iron, and in particular spheroidal graphite cast iron. This base body 10 defines an outer surface 12 of base body and an inner surface 14 of base body. The outer surface 12 is coated with an anticorrosion outer coating not shown, for example based on zinc. The pipe 2 further includes an inner liner 16 applied to the inner surface 14 of the intermediate portion 8 and the spigot end 4. The spigot end 6 is devoid of the inner liner 16. The inner liner 16 preferably has a wall thickness e between 2 mm and 10 mm, especially over its entire extent. The inner lining 16 is made of a material allowing the pipe 2 to transport wastewater having a pH which is between 4 and 13 and which may be punctually less than 4. For this purpose, the inner lining 16 comprises a mortar and is especially consisting of this mortar.

The pipe 2 further comprises a first abutment 18 and a second abutment which, when the mortar is applied in a liquid or viscous state to the inner surface 14 of the base body of the pipe 2, oppose the abutment. pouring mortar out of the parts to be coated.

The liner mortar 16 has a specific composition to be easy to apply while resisting aggressive effluents. The mortar is either a hydraulic mortar, optionally reinforced with at least one adjuvant and / or polymer and / or reinforcing fibers, or a resin mortar with optional addition of at least one adjuvant and / or reinforcing fibers.

The mortar is obtained from a mixture of dry materials and liquids. The dry materials comprise at least a first dry component and, at least in the case of a hydraulic mortar, a second dry component. In a variant, the dry materials comprise at least one third dry component.

The liquid materials comprise at least a first liquid component and, at least in the case of a resin mortar, a second liquid component. Alternatively, they may comprise additional liquid components. In the case of a hydraulic mortar, the first dry component is a mineral filler, for example crushed or rolled sand. Preferably, the mineral filler is a siliceous, silico-calcareous sand or a slag. The granulometry of the sand is less than 4mm. The second dry component is a hydraulic binder, especially a blast furnace cement, an aluminous cement or a cement comprising a polymer. The third dry component may be a superplasticizer, dye, retarder, water retencher or setting accelerator.

In the case of a hydraulic mortar, the first liquid component is water. Advantageously, the liquid materials of the hydraulic mortar comprise a second liquid component which may be a liquid additive type superplasticizer, dye, retarder setting, water retainer or setting accelerator. Also, in the case of a hydraulic mortar, the second liquid component may be a polymer, such as aqueous phase latex, or an epoxide. In the latter case, a hardener forming a third liquid component is also used, and the epoxide and hardener are then introduced separately into the dry materials. In the case of a hydraulic mortar, the mass ratio between the first dry component, namely sand, and the second dry component, namely cement, is between 2 and 3. The mass ratio between the first liquid component, namely water, and the second dry component, namely cement, is less than 0.45.

The hydraulic mortar according to the invention may also comprise reinforcing fibers of organic, mineral or metal type, and this in a proportion by weight of between 0.5% and 5% of the weight of the hydraulic binder. Preferably, the reinforcing fibers are then mixed with the mineral filler forming the first dry component before mixing it with the other dry materials. In the case of a resin mortar, this is obtained by mixing a dry mineral filler and an organic binder. The dry materials therefore consist of the dry mineral filler. This comprises at least a first dry component, for example a crushed or rolled sand. Preferably, the first dry component is a siliceous sand, silico-limestone or a slag, the particle size of the sand being less than 4 mm. Advantageously, the dry mineral filler comprises a second dry component, consisting for example of a siliceous or silico-calcareous sand. In particular, the dry mineral filler consists of these two dry components. Advantageously, these two dry components have different particle sizes. Preferably, the first dry component has a particle size of less than 4 mm, and the second dry component has a particle size of less than 0.4 mm. The term granulometry is used in application of the French standard XP P 18-545. The second dry component is therefore a finer sand than the sand constituting the first dry component. On the other hand, the first dry component constitutes between 60% and 90% by weight of the dry mineral filler, while the second dry component constitutes between 40% and 10% by weight of the dry mineral filler. The organic binder of the resin mortar preferably comprises a polyepoxide resin, or consists of such a polyepoxide resin. This polyepoxide resin consists of an epoxy subcomponent constituting the first liquid component, and a hardener subcomponent constituting the second liquid component. Advantageously, the epoxy subcomponent and the hardener subcomponent have a weight ratio of 100/30 to 100/60, and preferably 100/40 to 100/55. Alternatively, the organic binder comprises a polyurethane resin, or consists of such a polyurethane resin, which consists of a polyol subcomponent forming the first liquid component, and an isocyanate subcomponent forming the second liquid component. Advantageously, the ratio by weight between the inorganic filler and the organic binder is between 4/1 and 7.5 / 1. Alternatively, the liquid materials for the resin mortar may comprise one or more additional liquid components of dye, diluent or other type. The resin mortar according to the invention may also comprise reinforcing fibers of organic, mineral or metal type, and this in a proportion by weight of between 0.5% and 10% of the weight of the organic binder. The reinforcing fibers are then mixed with the dry mineral filler prior to mixing it with the organic binder. In Figure 2 is shown schematically an installation 30 adapted to apply the lining 16 to the base body 10 of a pipe 2 as described above. The installation 30 comprises a routing device 32 adapted for conveying the dry materials. The installation 30 further comprises a mixing and spraying device 34. Moreover, the installation 30 is provided with a first dry matter introduction device 36, a second dry matter introduction device 38 and a third dry matter introduction device 40. The installation 30 is further provided with a liquid supply device 39. This liquid supply device 39 comprises a first material introduction device liquid 42 and a second device for introducing liquid material 44.

The conveying device 32 is adapted to convey the dry materials and is provided with a casing 46 forming a conveying chamber 48. The conveying chamber 48 is provided with an inlet of the dry materials 50 and an outlet dry matter 52. The routing device 32 further comprises a delivery member 54 dry matter. In this case, the conveying device 32 is a screw conveyor, the conveying member being a screw 56 disposed in the conveying chamber 48. The conveying device 32 also constitutes a mixing device adapted to mixing the first dry component and the second dry component, and optionally the third dry component. The first dry matter introduction device 36 is adapted to introduce the first dry component into the entry of dry matter 50. The second dry matter introduction device 38 is adapted to introduce the second dry component into the inlet of the dry components. solids 50. The third dry matter introduction device 40 is adapted to introduce the third dry component into the entry of the solids 50.

The conveying chamber 48 is cylindrical with a circular section having a conveying chamber axis A1 and has an inside diameter DI1. The delivery chamber 48 therefore has a given cross section. The routing device 32 comprises a drive motor 58 adapted to drive the routing member 54.

The screw 56 comprises a central shaft 60 extending along a shaft axis A2. The screw 56 has a given screw pitch P1 and has an outside diameter D1. The screw 56 has a drive side 62 associated with the drive motor 58 and a free side 64, opposite to the drive side 62. The first dry matter introduction device 36 is a screw feeder and has an inlet reservoir 66 containing the first dry component. The second dry matter introduction device 38 is a screw feeder, and has an inlet tank 68 containing the second dry component. The third dry matter introduction device 40 is a screw feeder and has an inlet tank 70 containing the third dry component. The mixing and spraying device 34 is suitable for mixing the dry components and the liquid components. The mixing and spraying device 34 is provided with a housing 72 forming a mixing chamber 74. The mixing chamber 74 has an inlet for the dry materials 76, an inlet for the liquid materials 78, and a mortar outlet 80. the entry of the dry matter 76 is disposed downstream of the outlet of the dry matter 52 of the conveying chamber 48 and this dry matter outlet 52 opens into the inlet of the dry materials 76 of the mixing chamber 74. liquid material 78 is connected to the liquid supply device 39 and is disposed near and downstream of the dry material inlet 76 into the mixing chamber 74. The mixing and spraying device 34 is also provided with a mixing member 82 disposed in the mixing chamber 74. The mixing chamber 74 is circular-section cylindrical having a mixing chamber axis B1 and has an inner diameter D12. The mixing chamber 74 therefore has a given cross section. The mixing and projecting device 34 comprises a drive motor 84 25 adapted to drive the mixing member 82. The mixing member is a screw 86. The screw 86 comprises a central shaft 88 extending along an axis B2. The screw 86 has a given screw pitch P2 and has an outside diameter D2. The screw 86 has a drive side 90 associated with the drive motor 84 and a free side 92, opposite the drive side 90. The conveyor 54 is dissociated from the mixing member 82. The thread P1 is different from the P2 screw pitch. Preferably the screw pitch P1 is greater than the screw pitch P2. The outside diameter D2 is different from the outside diameter D1. In this case, the diameter D1 is greater than the diameter D2. In addition, the screws 56, 86 are axially dissociated and do not overlap. Also, the free sides 64, 92 of the two screws are adjacent to each other.

More specifically, the screws 56, 86 are axially spaced from one another forming an axial gap EC. The axial distance is measured along axes A2 and B2. The conveying chamber 48 and the mixing chamber 74 are arranged coaxially. In other words, the central axis B1 of the mixing chamber 74 is coaxial with the central axis A1 of the conveying chamber 48. The internal diameter DI1 is greater than the internal diameter D12. The cross section of the conveying chamber 48 is thus greater than the cross section of the mixing chamber 74. The mixing and projecting device 34 comprises a projection head 94 adapted to project the mortar onto the inner surface of the pipe. The projection head 94 has a head inlet 96 and at least one projection window 98. The mortar outlet 80 of the mixing chamber 74 opens into the head inlet 96. The mixing and projection device 34 defines a central axis YY, which is the central axis of the mixing chamber 74. The mixing and projection device 34 also defines a transport direction T directed parallel to the axis YY and directed from the entry of the dry materials 76 to the projection head 94. The mixing and projecting device 34 is provided with means for rotating the projection head 94 relative to the casing 72. Preferably, the projection head 94 and the body mixing 82 are integral in rotation. Thus, the projection head 94 and the mixing member 82 are driven by the same drive motor 84. The first liquid introduction device 42 is adapted to introduce the first liquid component in the dry materials. The first device for introducing liquid material 42 comprises an introduction channel 100 opening into the mixing chamber 74 at the inlet of the liquid materials 78. The introduction channel 100 opens into the mixing chamber 74 at location which is located downstream of the entry of the dry materials 76, considering the transport direction T. This introduction channel 100 passes through the wall of the housing 72 and is preferably arranged radially relative to the central axis YY, so that the first liquid component is introduced radially and perpendicularly into the mixing chamber 74. The first liquid introduction device 42 further comprises a pipe 102 and a metering device 104. The metering device 104 is connected by the line 102 to the introduction channel 100. Also, the metering device 104 comprises a reservoir 106 containing the first liquid component. The second device for introducing liquid material 44 is adapted to introduce the second liquid component into the dry materials.

The second liquid introduction device 44 comprises an introduction channel 108 opening into the mixing chamber 74. The introduction channel 108 opens into the mixing chamber 74 at the inlet of the liquid materials 78 to a location which is located downstream of the location where the introduction channel 100 of the first liquid component opens into the mixing chamber 74, considering the transport direction T. This introduction channel 108 passes through the wall of the housing 72 and is preferably arranged radially with respect to the central axis YY, so that the second liquid component is introduced radially and perpendicularly into the mixing chamber 74.

The second device for introducing liquid material 44 further comprises a line 110 and a metering device 112. The metering device 112 is connected via line 110 to the introduction channel 108. Also, the metering device 112 comprises a reservoir 114 containing the second liquid component. The introduction channel 100 and the pipe 102 are separated along their entire length from the introduction channel 108 and the pipe 110. In general, the liquid introduction devices 42, 44 are adapted to introduce the two liquid components separately from one another in the mixing chamber 74. For this purpose, the introduction channel 100 opens into the mixing chamber 74 spaced from the introduction channel 108.

The mixture of liquid components and dry components is therefore carried out exclusively in the mixing chamber 74 and not upstream of it. As a result, only the mixing chamber 74 must be cleaned when the plant 30 is shut down, which limits material losses. In order that the mortar can be applied satisfactorily to the inner surface of the pipe, the projection head 94 has a particular design. FIGS. 4 and 5 show an embodiment of this head 94. As can be seen in FIGS. 4 and 5, the projection head 94 comprises a base body 116. The base body 116 is for example in the form of a cylinder. hollow and extends along a central axis AA head. The base body 116 has an envelope surface 118. The projection head 94 has a plurality of projection windows 98 formed in the base body 116. In this case, the projection head 96 has six projection windows 98 Each projection window 98 is a radially through opening of the base body 116 with respect to the central AA head axis. FIG. 6 shows the envelope surface 118 unwound on the plane of FIG. 6.

Each projection window 98 has a substantially rectangular shape. In a variant, each projection window 98 has a substantially triangular shape.

Subsequently, a method of applying an inner liner 16 to the base body 10 of a pipe according to the invention will be described using the installation 30 of FIG. 2. During a first step, the first dry component and the second dry component are separately introduced into the dry material inlet 50 of the conveying chamber 48. The two dry components are mixed and conveyed by the conveyor device 32 to the outlet of the dry materials 52. homogeneous dry mixture is obtained at the outlet 52. Optionally, the third device for introducing dry matter introduces another dry component in the entry of the solids 50.

The dry materials are then introduced into the inlet of the dry materials 76 of the mixing and projection device 34 and are conveyed by the screw 86 in the conveying direction T, the screw 86 and the projection head 94 being rotated simultaneously and in a synchronous manner by the drive motor 84. During a second step, the first liquid component and, if appropriate, the second liquid component are introduced radially and perpendicularly with respect to the direction of transport T in the inlet of the liquid materials 78 and thus in the dry materials, inside the mixing chamber 74. This introduction of the first liquid component in the solids is carried out separately from the introduction of the second liquid component in the solids. As a variant, the introduction is carried out in a direction having a radial component or perpendicular to the conveying direction T, but is not strictly radial or perpendicular. In this case, the channels 100 and 108 are inclined with respect to the transport direction T and to the axis B1. During a third step, the liquid components and the dry components are mixed by the screw 86 in the mixing chamber 74 and form a homogeneous mortar which is conveyed into the projection head 94. The projection head 94 being rotated by the 84, the mortar is then projected onto the inner surface of the pipe 2 through the projection windows 98. During the projection, the pipe 2 is rotated about its axis XX in a direction of rotation identical to that of the head projection but at a rotational speed lower than that of the projection head, and the projection head 94 is moved axially inside and along the pipe 2. Once all the part of the inner surface 14 to be coating is covered by the mortar and as long as it is in the liquid or viscous state, the speed of rotation of the pipe 2 around its axis XX is increased in order to smooth the surface. 16 gauge of mortar coating. The acceleration produced when raising the speed of rotation of the pipe is between 50 and 100 times the normal acceleration of gravity.

As a variant, the device for supplying liquids has only one device for introducing a liquid component, for example in the case of a hydraulic mortar without liquid admixture. In another variant, the installation 30 may also be provided with additional dry matter introduction devices if other dry components must be introduced into the conveying chamber 48; preferably, the installation 30 is provided, for each dry component, with a separate dry matter introduction device adapted to introduce the dry component into the inlet of dry matter 50. Similarly, the installation 30 can also be provided with additional liquid introduction devices when other liquid components are to be introduced into the mixing chamber 74. Preferably the installation 30 is provided with as many devices for introducing liquid material that there a liquid components to introduce into the mixing chamber 74. In general, the liquid material introduction devices are adapted to introduce the liquid components separately from each other in the mixing chamber 74 and therefore have to effect of the introduction channels which open into the mixing chamber 74 at spaced apart locations. In addition, each introduction channel of a liquid component preferably opens radially into the mixing chamber 74.

Claims (15)

REVENDICATIONS1. Apparatus adapted for lining a pipe element with a mortar, of the type comprising - a conveying device (32) which is adapted for conveying the dry materials from the mortar, the conveying device comprising a conveying chamber (48) and a dry material conveyor (54) disposed in the conveying chamber, the conveying chamber (48) being provided with a dry material inlet (50) and an outlet of the materials dryers (52), characterized in that the installation comprises - a mixing device (34) adapted for mixing the dry materials with liquid materials in order to obtain the mortar, said mixing device having a mixing member (82) and a mixing chamber (74) for solids with liquids, said mixing chamber having a solids input (76), a liquid input (78) and a mortar outlet (80), in that the sor of the dry matter (52) of the conveying device (32) opens into the dry material inlet (76) of the mixing chamber (34), and that the conveying member (54) and the mixing member (82) are separate members. 2. Installation according to claim 1, wherein the conveying member (54) defines an axis (A2) and the mixing member (82) defines an axis (B2) and in which the conveying member ( 54) and the mixing member (82) are axially spaced from one another forming an axial gap (EC). 3. Installation according to claim 1 or 2, wherein the conveying member is a screw (56) and / or the mixing member is a screw (86). 4. Installation according to claim 3, wherein the conveying member is a screw (56) and the mixing member is a screw (86) and wherein the screws (56, 86) have screw threads ( P1, P2) and / or different outside diameters (D1, D2). 5. Installation according to any one of the preceding claims, wherein the conveying chamber (48) defines a chamber axis (Al) and the mixing chamber (74) defines a chamber axis (B1) and these axes of chamber are arranged coaxially to each other. 6. Installation according to any one of the preceding claims, wherein the conveying chamber (48) and the mixing chamber (74) have cross sections different from each other, and in particular in which the surface of the cross-section of the conveying chamber is larger than the cross-sectional area of the mixing chamber. 7. Installation according to any one of the preceding claims, comprising a first drive motor (58) adapted to drive the routing member (54) and comprising a second drive motor (84) adapted to drive the mixing member (82). 8. Installation according to any one of the preceding claims, wherein the conveying member (54) has a drive side (62) and a free side (64) and the mixing member has a drive side (90). and a free side (92) and wherein the two free sides (64, 92) are adjacent to each other, and in particular the two free sides are directed toward each other. 9. Installation according to any one of the preceding claims, comprising a projection head (94) adapted to project the mortar, the projection head (94) having a head inlet into which the mortar outlet (80), and at least one projection window (98) of the mortar. 10. Installation according to claim 9, wherein the or each projection window (98) has a general shape of triangle or quadrilateral. 11. Installation according to any one of the preceding claims, wherein the conveying device (32) is a mixing device which is adapted to mix at least a first dry component and a second dry component. 12. Installation according to any one of the preceding claims, comprising a device for supplying liquid materials (39) adapted to introduce the liquid materials in the dry materials, in particular the device for supplying liquid materials (39) comprising a device for introducing (42) a first liquid component and an introducer (44) of a second liquid component. 13. Installation according to claim 12, the device for introducing the first liquid component and the device for introducing the second liquid component being adapted to introduce the first liquid component and the second liquid component separately from one another. 14. Installation according to any one of claims 12 or 13, the or each liquid component introduction device being adapted to introduce the liquid component concerned into the dry matter in a direction having a component perpendicular to the direction of transport (T ) of the load or in a direction perpendicular to this direction of transport (T). 15. Use of an installation according to any one of the preceding claims for internally lining a base body of a pipe element with a mortar coating.