CN109742716B

CN109742716B - Composite pipe, pipeline system, die and manufacturing method using same

Info

Publication number: CN109742716B
Application number: CN201910082368.XA
Authority: CN
Inventors: 王志昂; 王大明
Original assignee: Ningxia Sanlin Pipe Industry Co ltd
Current assignee: Ningxia Sanlin Pipe Industry Co ltd
Priority date: 2019-01-28
Filing date: 2019-01-28
Publication date: 2024-05-14
Anticipated expiration: 2039-01-28
Also published as: CN109742716A

Abstract

The invention relates to a composite pipe, a pipeline system, a die for manufacturing the composite pipe and a manufacturing method. The composite pipe comprises a concrete pipe and a polymer layer, wherein the concrete pipe comprises an inner surface, an outer surface and a concrete layer positioned between the inner surface and the outer surface; a preformed hole and a preformed groove communicated with the preformed hole are arranged in the concrete layer; the preformed hole and the preformed groove are formed by preformed preset pieces; the polymer layer comprises a polymer layer body and a plurality of locking pieces fixedly connected with the polymer layer body; the locking piece includes locking part and the connecting portion of locking part and polymer layer body fixed connection respectively to at least locking part embedding concrete layer's inside makes the polymer layer cladding fix at the surface of concrete pipe in the locking piece. The locking piece prevents the high polymer layer from deformation or relative movement with the concrete pipe, and avoids the failure of the composite pipe. By using the preset piece, the production process can be effectively simplified, the production efficiency is improved, and the molding effect is good.

Description

Composite pipe, pipeline system, die and manufacturing method using same

Technical Field

The invention relates to the field of pipelines, in particular to a composite pipeline.

Background

The construction of the cable pipe network is always a national key infrastructure construction project, most of the existing cable pipes adopt a cast-in-place or assembly mode, the field workload is large, and the construction period is long. And the existing cable pipeline always uses a concrete pipeline, and the concrete pipeline is found in the use and construction process for many years that the bearing capacity is strong, but the water resistance is poor, the water seepage phenomenon of the pipeline is very serious, meanwhile, the corrosion resistance is poor, the long-term use corrosion phenomenon is serious, and the service life of the concrete pipeline is seriously damaged.

In order to solve the waterproof problem of the concrete pipeline, the prior art generally adopts modes of coating waterproof paint outside the concrete pipeline or laying waterproof coiled materials and the like, but the waterproof performance is to be improved due to the fact that the waterproof paint is easy to permeate in use, and the waterproof paint is easy to deform, swell and the like under the conditions of external force, temperature change, water soaking and the like, so that the waterproof paint or coiled materials are separated from the concrete pipeline, the service life is greatly shortened, and the waterproof effect is affected.

Disclosure of Invention

In order to solve at least one of the above technical problems, the present invention provides a composite pipe, a pipe system, a mold and a manufacturing method using the same.

An embodiment of an aspect of the present invention provides a composite pipe including:

A concrete pipe comprising an inner surface, an outer surface, and a concrete layer between the inner surface and the outer surface; the concrete layer is internally provided with a preformed hole, and the preformed hole is a hole with one end open and one end closed, which extends along the length direction of the concrete pipe; the inner surface of the concrete pipe is provided with a reserved groove communicated with the reserved hole; the preformed hole and the preformed groove are formed by preformed preset pieces;

the high polymer layer is arranged around the outer surface of the concrete pipe and comprises a high polymer layer body and a plurality of locking pieces fixedly connected with the high polymer layer body; the locking piece is positioned on the surface of the high polymer layer body opposite to the outer surface of the concrete pipe; the locking piece includes locking part and the connecting portion of locking part and polymer layer body fixed connection respectively to at least locking part embedding concrete layer's inside makes the polymer layer cladding fix at the surface of concrete pipe in the locking piece.

In some embodiments of the invention, the locking elements are distributed in a stripe, block or dot shape.

In some embodiments of the present invention, the locking members are in a strip shape or a block shape, the locking members are arranged in parallel, and the extending direction of the locking members is perpendicular to the length direction of the concrete pipe.

In some embodiments of the invention, the locking element has a cross-sectional shape that is rounded, T-shaped, mushroom-shaped, umbrella-shaped, or tree-shaped.

In some embodiments of the invention, the ratio of the height of the locking element to the thickness of the concrete layer is 0.01-0.5; preferably 0.02-0.2.

In some embodiments of the invention, the lock has a spacing l of 5-200mm; preferably 10 to 100mm; more preferably 15 to 50mm.

In some embodiments of the invention, the ratio of the thickness of the polymeric layer body to the thickness of the concrete layer is 0.001-0.5; preferably 0.002-0.2; more preferably 0.002-0.05.

In some embodiments of the invention, the ratio of the width of the locking portion to the width of the connecting portion is 1.1 to 10; preferably 1.5 to 5.

In some embodiments of the invention, the material of the polymer layer comprises 55-85 parts by weight of polyethylene, 10-35 parts by weight of EVA, 5-15 parts by weight of polyolefin elastomer (POE), 10-40 parts by weight of composite flame retardant and 1-10 parts by weight of auxiliary agent; wherein the polyethylene comprises High Density Polyethylene (HDPE) and low density linear polyethylene (LLDPE) in the ratio range of (3-5): (1.5-3); the composite flame retardant comprises an organosilicon flame retardant, a triazine flame retardant and a synergist, and the proportion range of the composite flame retardant is (2-5): (1-1.5): (0.1-0.5).

In some embodiments of the invention, the composite tube is a plain, bell and spigot, or tongue and groove structure; preferably the composite pipe is a socket structure comprising a socket and a spigot.

In some embodiments of the invention, the socket includes a first socket end face, a first socket step face connected to the first socket end face, a second socket step face connected to the first socket step face, a third socket step face connected to the second socket step face, and a second socket end face connected to the third socket step face.

In some embodiments of the present invention, a socket seal groove is provided in the first socket step surface, and a socket seal is provided in the socket seal groove; the cross-sectional shape of the socket seal is triangular, wherein one edge of the socket seal abuts the second socket step surface.

In some embodiments of the invention, the socket is further provided with a pressure test hole communicating the inner surface of the concrete pipe with the third socket step surface.

In some embodiments of the invention, the socket includes a first socket end face, a socket step face connected to the first socket end face, and a second socket end face connected to the socket step face.

In some embodiments of the invention, a socket seal groove is provided in the second socket end face, and a socket seal is provided in the socket seal groove.

In some embodiments of the invention, the composite pipe further comprises an adhesive layer between the polymeric layer body and the concrete layer.

In some embodiments of the invention, a retaining groove is provided in the inner surface of the concrete pipe.

The embodiment of the other aspect of the invention provides a pipeline system, which comprises a plurality of composite pipes, wherein two adjacent composite pipes are fixedly connected with each other; the fixed connection comprises the fixed connection of the polymer layers of two adjacent composite pipes and the fixed connection of the concrete pipes; the concrete pipe is fixedly connected with the two ends of the fixing rod, wherein the fixing rod penetrates into the reserved holes of the two adjacent composite pipes and is respectively fixed in the reserved grooves communicated with the reserved holes.

In some embodiments of the invention, the fixing rod is a screw rod with threaded parts at two ends; the fixing rods are respectively fixed in the reserved grooves by using nuts screwed into threaded parts of the screw rods.

In some embodiments of the invention, the secure attachment of the polymeric layers includes welding, bonding, or a combination thereof.

In some embodiments of the invention, the fixedly connecting the polymeric layers comprises bonding the polymeric layers of two adjacent composite tubes using self-adhesive waterproof tape or self-adhesive waterproof roll.

In some embodiments of the invention, the inner surfaces of the concrete pipes of two adjacent composite pipes are provided with glue injection grooves, and the glue injection grooves are simultaneously connected with the concrete layers of the two adjacent composite pipes; the two adjacent composite pipes are fixedly connected with each other and further comprise two adjacent composite pipes which are connected by sealant injected into the glue injection groove.

In some embodiments of the invention, the bottom dimension of the glue injection slot is larger than the opening dimension.

In some embodiments of the invention, the piping system further comprises at least one of a connection elbow, a tee, an inspection well, or a coiled tubing connected to the composite tubing.

The embodiment of the other aspect of the invention provides a die for manufacturing the composite pipe, which comprises a tray bottom die, an inner die and an outer die which are respectively and movably connected with the tray bottom die; the outer die is an openable outer die, the inner die is a telescopic inner die, and the inner die is provided with a preset part fixing part for fixing the preset part.

In some embodiments of the present invention, the outer mold includes a fixed portion, a first movable portion movably connected to the fixed portion through a first rotation shaft, a first driving device for driving the first movable portion to move, a second movable portion movably connected to the fixed portion through a second rotation shaft, and a second driving device for driving the second movable portion to move.

In some embodiments of the present invention, the inner mold comprises a telescoping template and an inner mold driving device for driving the telescoping template to move;

in some embodiments of the invention, the telescoping template comprises four corner telescoping plates positioned at corners and an edge telescoping plate positioned between every two corner telescoping plates; the internal mold driving device comprises an internal mold power device, a corner expansion plate connecting piece which is respectively and movably connected with the corner expansion plate and the internal mold power device, and a side expansion plate connecting piece which is respectively and movably connected with the side expansion plate and the internal mold power device.

In some embodiments of the present invention, the telescoping die plate further comprises telescoping fixed plates slidably connected to two adjacent corner telescoping plates, respectively, and rotating plates rotatably connected to the adjacent corner telescoping plates and the side telescoping plates, respectively.

In some embodiments of the invention, the telescopic template further comprises a fixed block slidably arranged on the side telescopic plate, and a fixed hole matched with the fixed block is further arranged on the telescopic fixed plate; the bottom of the side expansion plate is also provided with a clamping piece which can be clamped with the tray bottom die.

In some embodiments of the invention, the inner mold drive comprises an upper inner mold drive;

The upper internal mold driving device comprises an upper internal mold power device, an upper corner expansion plate connecting piece which is respectively and movably connected with the corner expansion plate and the upper internal mold power device, and an upper side expansion plate connecting piece which is respectively and movably connected with the side expansion plate and the upper internal mold power device;

the upper internal mold power device comprises a first internal mold power source, a first sliding block connected with the first internal mold power source and a first sliding column positioned between a first upper fixed plate and a first lower fixed plate; the first sliding block is sleeved on the first sliding column;

The upper corner expansion plate connecting piece comprises a first corner expansion plate connecting rod and a second corner expansion plate connecting rod, the second corner expansion plate connecting rod is movably connected with the corner expansion plate, and the first corner expansion plate connecting rod is movably connected with the second corner expansion plate connecting rod and the first sliding block respectively;

The upper side expansion plate connecting piece comprises a first side expansion plate connecting rod, a second side expansion plate connecting rod and a third side expansion plate connecting rod, wherein the first side expansion plate connecting rod is movably connected with the first sliding block, the second side expansion plate connecting rod and the third side expansion plate connecting rod are movably connected with the first side expansion plate connecting rod respectively, the second side expansion plate connecting rod is movably connected with the side expansion plate, and the third side expansion plate connecting rod is movably connected with the fixed block.

In some embodiments of the invention, the inner mold driving device further comprises a lower inner mold driving device;

the lower internal mold driving device comprises a lower internal mold power device, a lower corner expansion plate connecting piece which is respectively and movably connected with the corner expansion plate and the lower internal mold power device, and a lower side expansion plate connecting piece which is respectively and movably connected with the side expansion plate and the lower internal mold power device;

The lower internal mold power device comprises a second internal mold power source, a second sliding block connected with the lower internal mold power source and a second sliding column positioned between a second lower fixed plate and a second upper fixed plate, and the second sliding block is sleeved on the second sliding column;

The lower corner expansion plate connecting piece comprises a third corner expansion plate connecting rod and a fourth corner expansion plate connecting rod, the fourth corner expansion plate connecting rod is movably connected with the corner expansion plate, and the third corner expansion plate connecting rod is movably connected with the fourth corner expansion plate connecting rod and the second sliding block respectively;

The lower side expansion plate connecting piece comprises a fourth side expansion plate connecting rod, a fifth side expansion plate connecting rod and a sixth side expansion plate connecting rod, wherein the fourth side expansion plate connecting rod is movably connected with the second sliding block, the fifth side expansion plate connecting rod and the sixth side expansion plate connecting rod are movably connected with the fourth side expansion plate connecting rod respectively, and the fifth side expansion plate connecting rod and the sixth side expansion plate connecting rod are movably connected with the side expansion plate respectively.

In some embodiments of the present invention, the first and second inner mold power sources are the same power source that synchronously drives the upper and lower corner expansion plate connectors and the side expansion plate connectors to allow the inner mold to synchronously expand and contract.

In some embodiments of the invention, the same power source is a hydraulic cylinder.

In some embodiments of the invention, the inner and outer dies each comprise at least one die plate unit; the template unit comprises a plastic plate, a transverse supporting piece and a longitudinal supporting piece, and the transverse supporting piece and the longitudinal supporting piece are fixedly connected with the plastic plate.

In some embodiments of the invention, the lateral support comprises a steel plate body provided with mounting holes; the transverse supporting piece is fixedly connected with the plastic plate by using bolts to fix the transverse supporting piece with nuts embedded in the plastic plate in the mounting holes along the direction perpendicular to the plastic plate; the longitudinal support member is fixedly connected with the transverse support member.

An embodiment of another aspect of the present invention provides a method of manufacturing a composite pipe using the above-described mold, comprising:

Assembling the inner die, the outer die and the tray bottom die to form a cavity for preparing the composite pipe; fixing the macromolecule layer with the outer mold, and fixing the preset piece with the inner mold by using a preset piece fixing piece; pouring concrete into the cavity; curing and drying the concrete, and removing the mould to obtain a composite pipe; wherein removing the mold includes opening the outer mold and contracting the inner mold inwardly.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, or may be learned by practice of the invention.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:

FIG. 1 is a schematic perspective view of a composite pipe according to an embodiment of the present invention;

FIG. 2 is a schematic perspective view of the composite tube of FIG. 1 from another perspective;

FIG. 3 is a schematic view of a partial enlarged structure of the composite tube of FIG. 2;

FIG. 4 is a front view of the composite tube of FIG. 1;

FIG. 5 is a cross-sectional view of the composite tube of FIG. 4;

FIG. 6 is an enlarged view of portion A of the composite tube of FIG. 5;

FIG. 7 is a schematic perspective view of a portion of a polymer layer according to an embodiment of the present invention;

FIG. 8 is a front view of the polymer layer of FIG. 7;

FIG. 9 is a schematic perspective view of a preset according to another embodiment of the present invention;

FIG. 10 is a schematic perspective view of a portion of a polymer layer according to another embodiment of the present invention;

FIG. 11 is a schematic perspective view of a portion of a polymer layer according to another embodiment of the present invention;

FIG. 12 is a cross-sectional view of a locking element according to another embodiment of the present invention;

FIG. 13 is a schematic cross-sectional view of a piping system of another embodiment of the present invention, wherein two adjacent composite pipes are connected;

FIG. 14 is an enlarged view of portion B of FIG. 13;

FIG. 15 is an enlarged partial cross-sectional view of two adjacent composite pipe connections of a piping system according to another embodiment of the present invention;

FIG. 16 is a schematic perspective view of a screw according to another embodiment of the present invention;

FIG. 17 is a schematic perspective view of a mold according to another embodiment of the present invention;

FIG. 18 is a front view of a mold according to another embodiment of the present invention;

FIG. 19 is a schematic view showing an open state of an outer mold according to another embodiment of the present invention;

FIG. 20 is a top view showing a clamped state of an inner mold according to another embodiment of the present invention;

FIG. 21 is a sectional view showing an opened state of an inner mold according to another embodiment of the present invention;

FIG. 22 is a schematic view showing a partially structured perspective view of a mold clamping state of an inner mold according to another embodiment of the present invention;

FIG. 23 is a top view of the partial structure of FIG. 22;

FIG. 24 is a schematic view showing a partially structured perspective view of an opened state of an inner mold according to another embodiment of the present invention;

FIG. 25 is a schematic view showing a partially structured perspective view of a mold clamping state of an inner mold according to another embodiment of the present invention;

FIG. 26 is a schematic view showing a partially structured perspective view of an opened state of an inner mold according to another embodiment of the present invention;

fig. 27 is a partially enlarged structural view of the partial structure in fig. 26;

fig. 28 is a schematic perspective view of a telescopic plate unit according to another embodiment of the present invention;

Fig. 29 is an enlarged view of a portion C in fig. 28.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

The composite pipe, the pipe system, the mold used, and the manufacturing method thereof according to the embodiment of the present invention are described below with reference to the accompanying drawings.

As one aspect of the present invention, as shown in fig. 1 to 9, one embodiment of the present invention discloses a composite pipe comprising:

A concrete pipe 11 including an inner surface, an outer surface, and a concrete layer between the inner surface and the outer surface; the concrete layer is internally provided with a preformed hole 131, and the preformed hole 131 is a hole with one end open and one end closed, and the hole extends along the length direction of the concrete pipe; the inner surface of the concrete pipe 11 is provided with a preformed groove 132 communicated with the preformed hole 131; preformed hole 131 and preformed groove 132 are formed by preformed pre-form 13;

A polymer layer 12, wherein the polymer layer 12 is arranged around the outer surface of the concrete pipe 11 and comprises a polymer layer body 122 and a plurality of locking pieces 121 fixedly connected with the polymer layer body 122; the locking piece 121 is located on the surface of the polymer layer body 122 opposite to the outer surface of the concrete pipe 11; the locking piece 121 includes a locking portion 1212 and a connecting portion 1211 fixedly connected to the locking portion 1212 and the polymer layer body 122, respectively, and at least the locking portion 1212 of the locking piece 121 is embedded into the concrete layer so that the polymer layer is fixed on the outer surface of the concrete pipe.

In the present invention, the preformed holes are used to fix the concrete layers of two adjacent composite pipes using the connecting rods. When two adjacent composite pipes are connected, the corresponding two reserved holes are aligned, the connecting rod can be used for penetrating the reserved holes, two ends of the connecting rod are exposed out of the reserved groove, and the two ends of the connecting rod can be fastened in the reserved groove, so that concrete layers of the two adjacent composite pipes are fixed. The preset piece is a preformed integral component, for example, the preset piece can be integrally formed in advance by using plastic, and is installed in a die when in use, and the preset piece is combined with concrete after concrete is poured. Through the use of the preset piece, the production process can be effectively simplified, the production efficiency is improved, and the forming effect of the reserved hole and the reserved groove is good.

For the polymer layer, the locking piece 121 and the polymer layer body 122 may be respectively formed and then connected and fixed, or the locking piece 121 and the polymer layer body 122 may be integrally formed. The integral molding is, for example, compression molding, extrusion molding, or the like.

In the invention, the polymer layer positioned outside the concrete pipe mainly plays a role in waterproof, and can prevent water from entering the concrete pipe and avoid damaging devices positioned in the concrete pipe. The locking piece is used for locking the polymer layer and the concrete pipe by embedding the locking piece into the concrete layer, and the polymer layer cannot move relative to the concrete pipe during use. If the locking member is not provided, when the composite pipe is buried in the ground, the outer part of the polymer layer inevitably contacts with water to swell, and in addition, the polymer layer can bear temperature change or external acting force and the like, so that the polymer layer can deform or have a tendency to relatively move relative to the concrete pipe, and therefore, the polymer layer can be separated from the concrete pipe to cause the composite pipe to fail. After the locking portion of the locking member is embedded inside the concrete layer, the locking portion interacts with the concrete layer to provide a force in a direction perpendicular to the outer surface of the concrete pipe, thereby preventing the locking member from moving relative to the concrete pipe in the perpendicular direction of the outer surface of the concrete pipe. Therefore, the locking piece prevents the high polymer layer from deformation or relative movement with the concrete pipe, and avoids the failure of the composite pipe. It will be appreciated that in the embodiments of the present invention, the arrangement of the polymer layer on the outer surface of the concrete pipe may be determined according to practical needs, for example, it may cover a part of the outer surface of the concrete pipe or cover all of the outer surface, preferably all of the outer surface. When the concrete pipe is tubular, the polymer layer is also tubular, but it is understood that the polymer layer may be formed into a sheet with a locking member by extrusion molding, for example, and then the sheet is rewound and the seam is joined (e.g., bonded, welded, etc.) to form a tubular shape, so that it is possible to easily manufacture the polymer layers in the tubular shape of different sizes.

In the present invention, the concrete pipe may have a tubular structure of various shapes, and the present invention is not limited to the specific shape or structure of the concrete pipe. For example square, round or special tubes. In a preferred embodiment of the present invention, as shown in fig. 1 to 2, the concrete pipe is formed as a square pipe as a whole, and the square pipe has a circular arc transition structure at four corners thereof. The concrete used to make the concrete layer may be of the type commonly used, and concrete designations may be C25, C30, C35, C40, C45, C50, etc. The concrete layer in the present invention may be a layered structure made of pure concrete or a layered structure including other structures in addition to concrete, such as a reinforcing bar structure layer, etc. The steel bar structure is arranged according to the standard.

In another embodiment of the invention, the locking elements are distributed in the form of strips, blocks, dots or any other desired distribution. Specifically, as shown in fig. 7, the locking member 121 is in a bar shape, as shown in fig. 10, the locking member 121 is in a block shape, and as shown in fig. 11, the locking member 121 is in a dot shape. The invention can be used for mainly locking the polymer layer and the concrete layer without particularly limiting the distribution shape of the locking pieces. As shown in fig. 7, when the locking members 121 are distributed in a stripe shape, that is, when the locking members 121 extend continuously along the surface of the polymer layer 12 opposite to the outer surface of the concrete pipe 11, the extending direction may be parallel to the length direction of the concrete pipe or may form a certain angle with the length direction of the concrete pipe; preferably the locking member extends in a direction perpendicular to the length of the concrete pipe. Of course, as shown in fig. 10, when the distribution shape of the locking pieces 121 is a block, a plurality of independent locking piece blocks may be formed by extending a distance along the surface of the polymer layer 12 opposite to the outer surface of the concrete pipe 11, and the extending direction of the locking piece blocks may be parallel to the length direction of the concrete pipe or may form a certain included angle with the length direction of the concrete pipe; preferably the locking member extends in a direction perpendicular to the length of the concrete pipe. Of course, when the plurality of locking pieces are distributed in a strip shape or a block shape, the plurality of locking pieces can be arranged in parallel or form a certain included angle. In addition, as shown in fig. 11, when the distribution shape of the locking pieces 121 is a dot shape, that is, a plurality of individual dot-shaped locking pieces are distributed on the surface of the polymer layer 12 facing the outer surface of the concrete pipe 11, the plurality of individual dot-shaped locking pieces may be uniformly distributed on the polymer layer body or may be formed in other specific distribution shapes. In addition, the distribution shape of the locking pieces is preferably strip-shaped or block-shaped, and compared with the point-shaped locking pieces, the locking pieces are embedded into the concrete layer to be larger in volume, so that the high polymer layer and the concrete layer can be better fixed.

In the invention, the locking part in the locking piece plays a main role in locking, and the connecting part is used for connecting the locking part and the high polymer layer body. The shape of the locking member may not be particularly limited, and the locking effect of the locking member mainly means that after at least a part of the locking member is embedded in the concrete layer, the locking member interacts with the concrete layer and can provide a force in a direction perpendicular to the outer surface of the concrete pipe, so that the locking member is prevented from moving relative to the concrete pipe in the perpendicular direction of the outer surface of the concrete pipe, as long as the shape of the locking member satisfies the requirement. Of course, the locking element also interacts with the concrete layer, providing a force in a direction parallel to the outer surface of the concrete pipe, thereby avoiding movement of the locking element relative to the concrete pipe in a direction parallel to the outer surface of the concrete pipe. By way of non-limiting example, as shown in fig. 12 a-e, the cross-sectional shape of the locking element may be rounded, T-shaped, mushroom-shaped, umbrella-shaped, tree-shaped, etc.

In another embodiment of the invention, as shown in fig. 6, the concrete pipe has a thickness H which is the average thickness of the concrete pipe, for example 80-300mm, preferably 150-250mm; as shown in fig. 8, the locking member has a height h, for example, a height of 3 to 40mm, preferably 8 to 30mm, that is, a distance from the highest position of the top of the locking member to the polymer layer body in the cross section of the locking member (a cross section perpendicular to the extending direction of the locking member). The ratio of the height H of the locking member to the thickness H of the concrete layer is 0.01-0.5. Further preferably 0.02 to 0.2. Since the locking part is required to be embedded into the concrete layer at least, in order to ensure that the locking part and the concrete layer have enough connection strength, the locking part is required to be embedded into the concrete layer within a certain depth, if the depth is too small, the connection strength is possibly caused to be too low, and if the depth is too large, the strength of the concrete layer is affected.

In another embodiment of the invention, the locking elements have a spacing l, which refers to the distance between two adjacent parallel strip-shaped or block-shaped locking elements in a direction perpendicular to the direction of extension or the straight line distance between two adjacent point-shaped locking elements. As shown in FIG. 8, the interval l between the locking pieces 121 is 5 to 200mm, preferably 10 to 100mm, and more preferably 15 to 50mm. If the interval between the locking pieces is too large, the number of the locking pieces on the unit area or unit length of the polymer layer is small, so that the connection strength between the polymer layer and the concrete layer is insufficient, the interval is too small, the cost is greatly increased, and the strength of the outer surface of the concrete pipeline is possibly reduced. And in order to provide good locking strength of the locking element with the concrete layer, the locking element is spaced at least twice the maximum diameter of the aggregate used in the concrete layer.

In another embodiment of the present invention, as shown in fig. 6 and 8, the ratio of the thickness c of the polymer layer body to the thickness H of the concrete layer is 0.001-0.5, preferably 0.002-0.2, more preferably 0.002-0.05. The thickness c of the polymer layer body is the average thickness of the polymer layer body 122, so that the polymer layer body has good strength, can resist deformation under the action of external force, reduces the possibility of waterproof failure caused by breakage under the action of external force, has low swelling deformability, and the ratio of the thickness c of the polymer layer body to the thickness H of the concrete layer is 0.001 at the minimum, and in one embodiment, the thickness c is 1-40mm, for example; preferably 2-20mm; more preferably 4-10mm. However, too thick is not preferable, and the cost is greatly increased.

In another embodiment of the invention, shown in fig. 7-8, 12a-12e, the locking portion has a width a, the width of the locking portion refers to the transverse largest dimension of the locking portion in the cross section of the locking member, the connecting portion has a width b, and the width of the connecting portion refers to the transverse largest dimension of the connecting portion in the cross section of the locking member. The ratio of the width a of the locking portion to the width b of the connecting portion is 1.1 to 10, preferably 1.5 to 5. The ratio of the width a of the locking part to the width b of the connecting part cannot be too small, and the locking part cannot be effectively locked with the concrete layer, so that acting force in the direction perpendicular to the outer surface of the concrete pipe cannot be effectively provided, and the locking part is prevented from moving relative to the concrete pipe along the perpendicular direction of the outer surface of the concrete pipe; however, excessive proportions may result in increased costs or insufficient strength of the connection to effectively lock. In a preferred embodiment, a is of a value of, for example, 4-20mm, preferably 4-8mm, and b is of a value of, for example, 2-0mm, preferably 2-5mm. In addition, the ratio of the width a of the locking portion to the interval l of the locking pieces is 0.1 to 0.5, preferably 0.1 to 0.3, and if the ratio is too small, the bonding strength may be insufficient when the concrete between the locking portion and the adjacent locking pieces is bonded and fixed, but if the ratio is too large, the strength of the concrete between the adjacent locking pieces may be insufficient, and the locking portion may be insufficiently fixed.

In another embodiment of the present invention, the material of the polymer layer may be rubber or plastic, preferably plastic, for example PE, HDPE, EPDM, EVA, POE, ECB, PP, PVC, PU. Further, the material of the polymer layer body may be the same as or different from the material of the locking member. The same is preferable for ease of manufacture or ease of connection.

Further, the invention provides a preferable formula of the high polymer material layer, wherein the material of the high polymer layer comprises 55-85 parts by weight of polyethylene, 10-35 parts by weight of EVA, 5-15 parts by weight of polyolefin elastomer (POE) and 10-40 parts by weight of composite flame retardant. Of course, other auxiliary agents such as an anti-aging agent, a compatilizer, an initiator, an antioxidant, a lubricant, a coupling agent and the like can be added in 1-10 parts. Wherein the polyethylene comprises a High Density Polyethylene (HDPE) and a low density linear polyethylene (LLDPE) in a ratio in the range of (3 to 5) by weight: (1.5-3), in this range, the advantages of the high-density polyethylene and the low-density linear polyethylene are combined, so that the material of the high-molecular layer has good performances in the aspects of strength, cracking resistance, electrical insulation, stability, water resistance, corrosion resistance and the like, and the insulating performance of the material of the high-molecular layer can be improved and the electrical breakdown resistance can be improved due to the fact that relatively more high-density polyethylene is used. Since the composite pipe needs to have a good performance maintained for a lifetime once it is installed, in order to prevent failure caused by cracking of the polymer layer, the cracking resistance of the polymer layer material can be improved by adding polyolefin elastomer (POE). Wherein the composite flame retardant comprises an organosilicon flame retardant, a triazine flame retardant and a synergist, and the proportion range (by weight) of the composite flame retardant is (2-5): (1-1.5): (0.1-0.5). The organic silicon flame retardant is a silicone resin flame retardant or a polysilaboxane flame retardant, the triazine flame retardant can be melamine, salt thereof and the like, the synergist is a common flame retardant synergist, such as magnesium stearate, and the organic silicon flame retardant, the triazine flame retardant and the synergist are combined to be used by using the composite flame retardant, so that the flame retardant has good char-forming flame retardant performance, does not generate toxic gas, and has better flame retardant performance compared with the flame retardant performance of only using a single flame retardant.

The following materials for the polymer layers were tested according to GB18173.1 and GB/T8624.

The polymer layers of numbers 1 to 6 were tested and the results are shown in the following table.

Further, the inside of the composite pipe can be used for laying a cable line, and thus, it is required to have good antistatic properties, which can be achieved by adding an antistatic agent or by providing an antistatic layer on the inner surface or the outer surface of the polymeric layer body. Antistatic agents are, for example, cationic antistatic agents, anionic antistatic agents or nonionic antistatic agents, typically in amounts of from 0.3 to 3%. The anionic antistatic agent includes: alkyl sulfonates, alkyl sulfates, alkyl phosphates, alkylphenol polyoxyethylene sulfates, and the like. Nonionic antistatic agent (preferred): fatty acid polyol esters, alkanolamines, alkanolamides, and the like, as ethoxylated fatty alkylamine esters, fatty acids, adducts of fatty alcohols and ethylene oxide of alkylphenols.

The invention is not particularly limited to the interface structure of the composite pipe, and the composite pipe may be a plain, tongue and groove or bell and spigot structure. In a preferred embodiment, as shown in FIGS. 1-5, the composite tube 12 is a bell and spigot structure, including a spigot 111 and a socket 15.

Further, in a preferred embodiment, as shown in FIG. 6, socket 111 includes a first socket end face 1111, a first socket step face 1112 connected to the first socket end face, a second socket step face 1113 connected to the first socket step face, a third socket step face 1114 connected to the second socket step face, and a second socket end face 1115 connected to the third socket step face 1114. In a preferred embodiment, the first socket end surface 1111, the second socket step surface 1113 and the second socket end surface 1115 are disposed in parallel, in a substantially vertical direction. The first and third socket step surfaces 1112, 1114 are disposed in parallel and generally inclined with respect to the horizontal, preferably at an angle of 15-25 degrees to the horizontal.

Further, in a preferred embodiment, as shown in FIG. 6, a socket seal groove 113 is provided in the first socket step surface 1112, and a socket seal 112 is provided in the socket seal groove 113. The cross-sectional shape of the socket seal may be selected as desired, such as triangular, square, trapezoidal, circular, oval, or other shapes. In a preferred embodiment, the cross-sectional shape of the socket seal 112 is triangular, with one side of the socket seal 112 abutting the second socket step surface 1113. When inserting the socket into the socket, through making an limit of sealing member support against the second socket step face, can prevent that the socket sealing member from taking place to remove and can guarantee to have good sealed effect. Further, in a preferred embodiment, as shown in FIGS. 5-6, the spigot 111 is provided with a pressure test hole 14 communicating the inner surface of the concrete pipe with the third spigot step surface 1114. The function of the pressure test hole is that after the bell mouth and the spigot are spliced together, a pressure test experiment can be carried out, the sealing performance of the interface between adjacent pipelines is tested, and after the spigot is connected with the bell mouth, the sealing performance of the connection of the polymer layers of two adjacent composite pipes and the sealing performance of the spigot sealing piece can be tested simultaneously. After the test, if the sealing performance of the interface is required to be further improved when the sealing performance cannot meet the requirement, the sealing performance of the interface is ensured by pouring the sealant through the pressure test hole.

Further, in a preferred embodiment, as shown in FIGS. 2-3, 5, the socket 15 includes a first socket end face 154, a socket step face 155 connected to the first socket end face, and a second socket end face 156 connected to the socket step face 155. In a preferred embodiment, the first socket end face 154 and the second socket end face 156 are disposed in parallel, generally in a vertical direction. The socket step face 155 also has a clamping angle relative to the horizontal, corresponding to 15-25 degrees to the socket. The angle of the step face that bellmouth and socket set up is convenient for install to insert the bellmouth at the socket and connect the back, two adjacent compound pipes can take place relative deformation under external force, the angle scope of the step face that bellmouth and socket set up, allow two adjacent compound pipes to take place little relative deformation, avoid connecting inefficacy.

Further, in a preferred embodiment, as shown in fig. 5 and 14, the second socket end face 156 is provided with a socket seal groove 152, and a socket seal 151 is provided within the socket seal groove 152. The cross-sectional shape of the socket seal may be selected as desired, such as triangular, square, trapezoidal, circular, oval, or other shapes. Further, in a preferred embodiment, the cross-sectional shape of the socket seal is square, and since the first socket end surface 1111 of the socket abuts the second socket end surface 156 of the socket, the cross-sectional shape of the socket seal is selected to be square, which ensures good sealing performance.

In another embodiment of the present invention, other materials, such as an adhesive layer, are further disposed between the polymer layer body and the concrete layer, so that the polymer layer is bonded to the concrete layer through the adhesive layer and the locking member at the same time, and the bonding strength between the polymer layer and the concrete pipe can be increased.

In another embodiment of the present invention, as shown in fig. 2, 3, 5, a fixing groove 16 is provided at the inner surface of the concrete pipe 11. The fixed slot is used for providing a fixed position of a mounting device (such as a hydraulic device) when two adjacent composite pipes are mounted, so that the composite pipes can be mounted and fixed conveniently.

In another embodiment of the present invention, as shown in fig. 13-16, another aspect of the present invention provides a piping system, which includes a plurality of the above-mentioned composite pipes, and two adjacent composite pipes are fixedly connected to each other; the fixed connection comprises the fixed connection of the polymer layers of two adjacent composite pipes and the fixed connection of the concrete pipes; the concrete pipe is fixedly connected with the two ends of the fixing rod, wherein the fixing rod penetrates into the reserved holes of the two adjacent composite pipes and is respectively fixed in the reserved grooves communicated with the reserved holes. In one embodiment, as shown in fig. 13, two adjacent composite pipes 1 are fixedly connected to each other.

Further, the pipeline system optionally comprises a connecting bent pipe with two ends connected with the composite pipe, optionally comprises three-way pipes respectively connected with the three composite pipes, and optionally comprises an inspection well and/or a tray well connected with the composite pipe, wherein the connecting bent pipe, the three-way pipe, the inspection well and the tray well can be manufactured by prefabricated members, cast-in-situ on a construction site or semi-prefabricated semi-casting method.

Further, the fixed rod is a screw rod with threaded parts at two ends; the fixing rods are respectively fixed in the reserved grooves by using nuts screwed into threaded parts of the screw rods. As shown in fig. 15 and 16, the screw 17 has a screw body 171 and screw portions 172 at both end portions thereof, and by threading the screw 17 into the preformed holes 131 of the adjacent two composite pipes, the screw portions 172 are exposed in the preformed grooves 132, and then are respectively tightened with nuts 18 engaged with the screw portions 172.

In one embodiment, as shown in fig. 1-3 and 5, four reserved grooves 132 are provided on each end of the inner wall of the concrete pipe 11, the openings of the reserved holes 131 with the socket ends communicating with the four reserved grooves 132 are located on the first socket end surface 1111 of the socket 11, and the openings of the reserved holes 131 with the socket ends communicating with the four reserved grooves 132 are located on the second socket end surface 156 of the socket 15. And preferably, the reserved groove divides the reserved hole into two sections, and the reserved hole of the two sections is communicated with the reserved groove. In another embodiment, as shown in fig. 1,3 and 9, when two composite pipes are connected, a through hole 133 communicating with the preformed hole 131 is provided in the inner surface of the concrete pipe 11, and a screw can be fixed by using a bolt or the like through the through hole.

In addition, in a preferred embodiment, as shown in fig. 15, the preformed hole 131 has a gradually increasing diameter from the preformed groove 132 toward the direction of extension of the opening. Because after two adjacent composite pipes are connected, relative movement can occur, when the screw 17 is inserted into the reserved hole for connection, the screw is allowed to move in the reserved hole with gradually increased diameter, and the screw deformation is avoided to cause connection failure.

In an embodiment of the present invention, the polymer fixing connection may be welding, bonding, or a combination thereof, wherein the welding is to directly melt and connect the polymer layers of two adjacent composite pipes together, or respectively weld the polymer layers of two composite pipes with each other by solder. The welding is preferably electric welding, hot welding, or the like. The bonding is performed by connecting and fixing with adhesive materials, such as adhesive tape, adhesive, etc. The bonding is preferably self-adhesive, further self-adhesive bonding is preferably using self-adhesive waterproof tape or self-adhesive waterproof roll, i.e. the fixed connection of the polymer layers comprises using self-adhesive waterproof tape or self-adhesive waterproof roll to bond the polymer layers of two adjacent composite tubes. The self-adhesive waterproof tape or the self-adhesive waterproof coiled material can be asphalt-based or non-asphalt-based. As the non-asphalt-based self-adhesive waterproof tape or waterproof roll, EPDM, HDPE, TPO, EVA, ECB, silicone rubber self-adhesive waterproof tape or roll, etc. can be used. As shown in fig. 13-15, the polymeric layers 12 of adjacent two composite tubes are bonded in one embodiment by use of self-adhesive waterproof tape 2. Through using self-adhesive waterproof tape or self-adhesive waterproofing membrane can carry out fixed connection to the polymer layer effectively to can effectively waterproof, prevent that water from entering into interface department, and for other connected mode, have more efficient connection efficiency.

In another embodiment of the invention, the inner surfaces of the concrete pipes of two adjacent composite pipes are provided with glue injection grooves which are simultaneously connected with the concrete layers of the two adjacent composite pipes; the two adjacent composite pipes are fixedly connected with each other, and the two adjacent composite pipes are connected by the sealant injected into the glue injection groove. Further, the bottom dimension of the glue injection groove is larger than the opening dimension. In an embodiment, as shown in fig. 14, a glue injection groove 153 is provided at the abutting position of the concrete pipes 11 of the adjacent composite pipes 1, and can be regarded as being formed by recessing from the inner surface of one or both of the concrete layers of the adjacent two composite pipes toward the inside of the concrete layers, and the size of the bottom of the glue injection groove is larger than the size of the opening, so that the glue can be prevented from falling out of the glue injection groove after the glue injection is performed.

As another aspect of the present invention, an embodiment of the present invention provides a mold for manufacturing the composite pipe in the above embodiment, the mold including a pallet bottom mold, an inner mold and an outer mold movably connected to the pallet bottom mold, respectively; the outer die is an openable outer die, the inner die is a telescopic inner die, and the inner die is provided with a preset part fixing part for fixing the preset part. As shown in fig. 17 to 18, the inner mold 4 and the outer mold 3 in the mold are schematically shown in a closed state and assembled with the tray bottom mold 5.

In an embodiment, as shown in fig. 17 to 19, the outer mold 3 includes a fixed portion 311, a first movable portion 312 movably connected to the fixed portion 311 through a first rotation shaft 322, a first driving device 321 for driving the first movable portion 312 to move, a second movable portion 313 movably connected to the fixed portion 311 through a second rotation shaft 324, and a second driving device 323 for driving the second movable portion 313 to move. In an embodiment, the first driving device 321 includes a fixed portion driving mounting member 3213 fixedly connected to the fixed portion 311, a movable portion driving mounting member 3211 fixedly connected to the first movable portion 312, and a power device 3212 movably connected to the fixed portion driving mounting member 3213 and the movable portion driving mounting member 3211, respectively. In a preferred embodiment the power means 3212 is a hydraulic means. The second driving means 323 has a structure similar to that of the first driving means 321. When the outer mold is required to be opened for demolding, as shown in fig. 19, the first movable portion 312 is driven to rotate around the first rotation axis 322 relative to the fixed plate 311 by the first driving device 321, and the second movable portion 313 is driven to rotate around the second rotation axis 324 relative to the fixed plate 311 by the second driving device 323, so that the outer mold is opened.

In another embodiment, the inner mold 4 includes a telescoping stencil and an inner mold driving device that drives the telescoping stencil. The internal mold driving device drives the telescopic mold plate to shrink inwards, so that the internal mold is demolded, and the telescopic mold plate can be driven to stretch outwards to perform mold closing. In one embodiment, as shown in fig. 17, 20-21, telescoping template 41 includes four corner telescoping plates 411 at the corners and an edge telescoping plate 412 between each two corner telescoping plates. The corner expansion plates and the side expansion plates are matched and assembled with each other to form the shape of the inner surface of the concrete pipe. Preferably, the cross-sectional shape of the side expansion plate is a trapezoid shape, so that the side expansion plate can be conveniently retracted inwards, and the shape of the two ends of the corner expansion plate is matched with the side expansion plate. In addition, as shown in fig. 20, the telescoping template 41 further includes telescoping fixed plates 413 movably connected to two adjacent corner telescoping plates 411, respectively. The telescopic fixing plate can be arranged on the upper part of the corner telescopic plate and can be respectively connected with two adjacent corner telescopic plates in a sliding way. In one embodiment, as shown in fig. 22-23, the telescoping fixed plate 413 is provided with a sliding hole 4132, and the corner telescoping plate is fixedly connected with a sliding shaft 4131 that slides within the sliding hole 4132. By arranging the telescopic fixing plates 413, two adjacent corner telescopic plates can slide relatively along the sliding holes respectively, and are close to each other to shrink. The telescoping die plate 41 further includes a fixing block 415 slidably provided on the side telescoping plate 412, and a fixing hole 4133 is provided on the telescoping fixing plate 413 to be engaged with the fixing block 415. In the mold clamping state, the fixing block 415 is engaged with the fixing hole 4133, so that the edge expansion plate 412 and the corner expansion plate 411 can be fixed to each other, relative movement can be prevented, and the fixed shape can be maintained. In one embodiment, as shown in fig. 22, the telescopic template 41 further includes a rotating plate 417 rotatably connected to the corner telescopic plate 411 and the side telescopic plate 412, respectively, so that the corner telescopic plate 411 and the side telescopic plate 412 can rotate relatively. The bottom of the side expansion plate 412 is further provided with an engaging piece 416 that can engage with the tray bottom die 5. In addition, in one embodiment, as shown in FIGS. 20, 25-27, the corner telescoping plate 411 is further provided with a preset fixture 414, the preset fixture 414 being slidably coupled to the corner telescoping plate 411. The surface of the corner expansion plate 411 is provided with a groove, when the internal mold is in a mold closing state, the preset piece fixing piece 414 can protrude out of the surface of the corner expansion plate 411 to fix the preset piece, and when the internal mold is in a mold opening state, the preset piece fixing piece 414 is contracted into the groove so that the surface of the preset piece fixing piece 414 is lower than the surface of the corner expansion plate 411.

In one embodiment, as shown in fig. 20-21, the inner mold drive may include an upper inner mold drive 42 and a lower inner mold drive 43. The corner telescoping plates 411 and the side telescoping plates 412 are respectively movable by inward contraction and outward expansion under the driving of the inner mold driving device.

Further, as shown in fig. 20, the upper inner mold driving device 42 includes an upper inner mold power device 422, an upper corner expansion plate connecting member 421 movably connected to the corner expansion plate 411 and the upper inner mold power device 422, respectively, and an upper side expansion plate connecting member 423 movably connected to the side expansion plate 412 and the upper inner mold power device 422, respectively.

As shown in fig. 22-24, the upper internal mold power unit 422 includes a first internal mold power source 4221, a first sliding block 4222 connected to the first internal mold power source 4221, and a first sliding column 4223 disposed between a first upper fixed plate 4225 and a first lower fixed plate 4224, wherein the first sliding block 4222 is sleeved on the first sliding column 4223 disposed between the first upper fixed plate 4225 and the first lower fixed plate 4224. The first slide block 4222 is slidable along the first slide post 4223 under the drive of the first internal mold power source 4221.

As shown in fig. 25-27, the upper corner expansion plate connecting member 421 includes a first corner expansion plate connecting rod 4211 and a second corner expansion plate connecting rod 4212, the second corner expansion plate connecting rod 4212 is movably connected with the corner expansion plate 411, and the first corner expansion plate connecting rod 4211 is movably connected with the second corner expansion plate connecting rod 4212 and the first sliding block 4222 respectively.

22-24, The upper side expansion plate connecting piece 423 includes a first side expansion plate connecting rod 4231, a second side expansion plate connecting rod 4232, and a third side expansion plate connecting rod 4233, where the first side expansion plate connecting rod 4231 is movably connected with the first sliding block 4222, the second side expansion plate connecting rod 4232 and the third side expansion plate connecting rod 4233 are movably connected with the first side expansion plate connecting rod 4231, and the second side expansion plate connecting rod 4232 is movably connected with the side expansion plate 412, and the third side expansion plate connecting rod 4233 is movably connected with the fixed block 415.

Further, as shown in fig. 21, the lower inner mold driving device 43 includes a lower inner mold power device 432, a lower corner expansion plate connecting member 431 movably connected to the corner expansion plate 411 and the lower inner mold power device, respectively, and a lower side expansion plate connecting member 433 movably connected to the side expansion plate 412 and the lower inner mold power device 432, respectively.

As shown in fig. 22 and 24, the lower internal mold power device 432 includes a second internal mold power source 4321, a second sliding block 4322 connected to the lower internal mold power source 4221, and a second sliding column 4323 disposed between the second lower fixing plate 4325 and the second upper fixing plate 4324, wherein the second sliding block 4322 is sleeved on the second sliding column 4323 disposed between the second lower fixing plate 4325 and the second upper fixing plate 4324. The second sliding block 4322 can slide along the second sliding column 4323 under the driving of the second internal mold power source 4321.

As shown in fig. 25-26, the lower corner expansion plate connection member 431 includes a third corner expansion plate connection rod 4311 and a fourth corner expansion plate connection rod 4312, the fourth corner expansion plate connection rod 4312 is movably connected with the corner expansion plate 411, and the third corner expansion plate connection rod 4311 is movably connected with the fourth corner expansion plate connection rod 4312 and the second sliding block 4322 respectively.

As shown in fig. 22 and 24, the lower side expansion plate connector 433 includes a fourth side expansion plate connector 4331, a fifth side expansion plate connector 4332, and a sixth side expansion plate connector 4333, the fourth side expansion plate connector 4331 is movably connected to the second sliding block 4322, the fifth side expansion plate connector 4332 and the sixth side expansion plate connector 4333 are movably connected to the fourth side expansion plate connector 4331, and the fifth side expansion plate connector 4332 and the sixth side expansion plate connector 4333 are movably connected to the side expansion plate 412.

In one embodiment, the first and second mold power sources 4221 and 4321 are preferably the same power source, such as a hydraulic cylinder, which simultaneously drives the upper and lower corner and side expansion plate connectors to allow the mold to expand and contract simultaneously. Through using same power supply, synchronous drive upper portion and lower part's bight expansion plate connecting piece and limit expansion plate connecting piece for the bight expansion plate and the limit expansion plate of centre form are flexible simultaneously respectively, improve the synchronism of die sinking or compound die, guarantee manufacturing accuracy.

In the mold-in state, that is, in the mold-closed state, as shown in fig. 20, 22, 23, and 25, when the mold is opened, as shown in fig. 21, 24, and 26 to 27, the first slide block 4222 slides down the first slide column 4223 by the drive of the first mold power source 4221, and the second slide block 4322 slides up the second slide column 4323 by the drive of the second mold power source 4321. When the first sliding block 4222 slides downwards, the first side telescopic plate connecting rod 4231 is driven to move inwards and downwards, so that a third side telescopic plate connecting rod 4233 movably connected with the first side telescopic plate connecting rod 4231 is driven to move inwards and downwards, and the third side telescopic plate connecting rod 4233 drives the fixed block 415 to slide downwards and separate from the fixed hole 4133; and drives the second side expansion plate connection 4232 movably connected with the first side expansion plate connection rod 4231 to drive the side expansion plate 412 to move inwards. When the second sliding block 4322 slides upwards along the second sliding column 4323, the fourth expansion plate connecting rod 4331 is driven to move upwards and inwards, so that the fifth expansion plate connecting rod 4332 and the sixth expansion plate connecting rod 4333 which are movably connected with the fourth expansion plate connecting rod 4331 are driven to move upwards and inwards, and the side expansion plate 412 is driven to move inwards. And the edge extension plate 412 is rotated with respect to the corner extension plate 411 due to the restriction of the rotation plate 417.

When the first sliding block 4222 slides downwards, the first corner expansion plate connecting rod 4211 is driven to move inwards and downwards, so that the second corner expansion plate connecting rod 4212 movably connected with the first corner expansion plate connecting rod 4211 is driven to move inwards and downwards, and the corner expansion plate 411 movably connected with the second corner expansion plate connecting rod 4212 is driven to move inwards; when the second sliding block 4322 slides upwards, the third corner expansion plate connecting rod 4311 is driven to move upwards and inwards, so that the fourth corner expansion plate connecting rod 4312 movably connected with the third corner expansion plate connecting rod 4311 is driven to move upwards and inwards, and the edge expansion plate 412 is driven to move inwards. And the preset fasteners 414 slide inwardly to retract into the grooves in the surface of the corner telescoping plate 411. And due to the restriction of the expansion and contraction fixing plate 413, the adjacent corner expansion and contraction plates 411 are slid along the sliding holes 4132 by the sliding shaft 4131 so that the adjacent corner expansion and contraction plates are brought close to each other.

The inner mold 4 and the outer mold 3 in the present invention may include at least one mold plate unit 6, as shown in fig. 28, the mold plate unit 6 including a plastic plate 61, a lateral support 62 and a longitudinal support 63, the lateral support 62 and the longitudinal support 63 being fixedly coupled to the plastic plate 61. In one embodiment, as shown in fig. 29, the lateral support member has a steel plate body 621, the steel plate body 621 is provided with a mounting hole 622, and the lateral support member 62 is fixed to the plastic plate 61 by fixing nuts embedded in the plastic plate in the mounting hole 622 in a direction perpendicular to the plastic plate 61 by using bolts 623. The longitudinal support 63 is fixedly connected to the transverse support 62, for example, the longitudinal support also has a steel plate body, which can be fixed by means of welding. The mould unit adopts the plastic plate as the main body, so that the weight of the mould can be reduced, the mould is convenient to demould, the manufacture is convenient, and the cost of the mould can be obviously reduced. The transverse support and the longitudinal support, which are fixed to the plastic plate, provide the plastic plate with sufficient shape-retaining strength to avoid deformation of the plastic plate during the production of the composite tube.

Another aspect of the present invention provides a method of manufacturing a composite pipe using the above-described mold, as shown in fig. 17 to 27, comprising:

assembling the inner die 4, the outer die 3 and the tray bottom die 5 to form a cavity for preparing the composite pipe; fixing the high molecular layer with the outer mold 3, and fixing the preset piece 13 with the inner mold 4 by using a preset piece fixing piece 414; pouring concrete into the cavity; curing and drying the concrete, and removing the mould to obtain a composite pipe; wherein removing the mould comprises opening the outer mould 3 and contracting the inner mould 4 inwards. Wherein the specific opening procedure of the outer mould and the shrinkage procedure of the inner mould 4 are as in the previous embodiments.

It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "includes," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless an order of performance is explicitly stated. It should also be appreciated that additional or alternative steps may be used.

It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present invention, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.

In the present invention, unless explicitly specified and limited otherwise, the terms "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly attached, detachably attached, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or through communication between two elements or interaction between the two elements, unless otherwise specifically indicated. The specific meaning of the above terms in the invention will be understood by those skilled in the art according to the specific circumstances.

The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the technical scope of the present invention should be covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A composite pipe, comprising:

A concrete pipe comprising an inner surface, an outer surface, and a concrete layer between the inner surface and the outer surface; the concrete layer is internally provided with a preformed hole, and the preformed hole is a hole with one end open and one end closed, and the hole extends along the length direction of the concrete pipe; a reserved groove communicated with the reserved hole is formed in the inner surface of the concrete pipe; the preformed hole and the preformed groove are formed by preformed preset pieces;

The high polymer layer is arranged around the outer surface of the concrete pipe and comprises a high polymer layer body and a plurality of locking pieces fixedly connected with the high polymer layer body; the locking piece is positioned on the surface of the high polymer layer body opposite to the outer surface of the concrete pipe; the locking piece comprises a locking part and a connecting part which is respectively and fixedly connected with the locking part and the polymer layer body, and at least the locking part of the locking piece is embedded into the concrete layer so that the polymer layer is coated and fixed on the outer surface of the concrete pipe;

The composite pipe is of a faucet structure and comprises a faucet and a bell mouth;

the socket comprises a first socket end face, a first socket step face connected with the first socket end face, a second socket step face connected with the first socket step face, a third socket step face connected with the second socket step face and a second socket end face connected with the third socket step face;

The bellmouth comprises a first bellmouth end surface, a bellmouth step surface connected with the first bellmouth end surface and a second bellmouth end surface connected with the bellmouth step surface; the first bell mouth end face is matched with the first socket end face, the second bell mouth end face is matched with the second socket end face, and gaps are formed among the bell mouth step face, the first socket step face, the second socket step face and the third socket step face;

A socket sealing piece groove is formed in the first socket step surface, and a socket sealing piece is arranged in the socket sealing piece groove; the cross-sectional shape of the socket seal is triangular, wherein one side of the socket seal abuts against the second socket step surface;

the socket is also provided with a pressure test hole communicated with the inner surface of the concrete pipe and the step surface of the third socket.

2. The composite tube of claim 1, wherein: the distribution shape of the locking pieces is strip, block or dot.

3. The composite tube of claim 2, wherein: the locking pieces are strip-shaped or block-shaped, the locking pieces are arranged in parallel, and the extending direction of the locking pieces is perpendicular to the length direction of the concrete pipe.

4. The composite tube of claim 1, wherein: the cross section of the locking piece is round, T-shaped, mushroom-shaped, umbrella-shaped or tree-shaped.

5. The composite tube of claim 1, wherein: the ratio of the height of the locking member to the thickness of the concrete layer is 0.01-0.5.

6. The composite tube of claim 5, wherein: the ratio of the height of the locking member to the thickness of the concrete layer is 0.02-0.2.

7. A composite tube according to claim 3, wherein: the interval l between the locking pieces is 5-200mm.

8. The composite tube of claim 7, wherein: the interval l of the locking pieces is 10-100 mm.

9. The composite tube of claim 8, wherein: the interval l of the locking pieces is 15-50 mm.

10. The composite tube of claim 1, wherein: the ratio of the thickness of the polymer layer body to the thickness of the concrete layer is 0.001-0.5.

11. The composite tube of claim 10, wherein: the ratio of the thickness of the polymer layer body to the thickness of the concrete layer is 0.002-0.2.

12. The composite tube of claim 11, wherein: the ratio of the thickness of the polymer layer body to the thickness of the concrete layer is 0.002-0.05.

13. The composite tube of claim 1, wherein: the ratio of the width of the locking portion to the width of the connecting portion is 1.1-10.

14. The composite tube of claim 13, wherein: the ratio of the width of the locking part to the width of the connecting part is 1.5-5.

15. The composite tube of claim 1, wherein: the material of the high polymer layer comprises 55-85 parts by weight of polyethylene, 10-35 parts by weight of EVA, 5-15 parts by weight of polyolefin elastomer (POE), 10-40 parts by weight of composite flame retardant and 1-10 parts by weight of auxiliary agent; wherein the polyethylene comprises High Density Polyethylene (HDPE) and low density linear polyethylene (LLDPE) in the proportion range of (3-5): (1.5-3); the composite flame retardant comprises an organosilicon flame retardant, a triazine flame retardant and a synergist, wherein the proportion range of the composite flame retardant is (2-5): (1-1.5): (0.1-0.5).

16. The composite tube of claim 15, wherein: and a socket sealing piece groove is formed in the second socket end face, and a socket sealing piece is arranged in the socket sealing piece groove.

17. The composite tube of claim 1, wherein: the composite pipe further comprises an adhesive layer positioned between the high polymer layer body and the concrete layer.

18. The composite tube of claim 1, wherein: a fixing groove is arranged on the inner surface of the concrete pipe.

19. A pipe system comprising a plurality of composite pipes according to any of claims 1-18, and two adjacent composite pipes being fixedly connected to each other; the fixed connection comprises the fixed connection of the polymer layers of two adjacent composite pipes and the fixed connection of the concrete pipes; the concrete pipe is fixedly connected with the two ends of the fixing rod, and the fixing rod is fixedly connected with the two ends of the concrete pipe.

20. The piping system of claim 19, wherein: the fixed rod is a screw rod with threaded parts at two ends; and the fixing rods are respectively fixed in the reserved grooves by screwing nuts into threaded parts of the screw rods.

21. A pipe system according to claim 19 or 20, characterized in that: the fixed connection of the polymer layers comprises welding, bonding or a combination thereof.

22. The piping system of claim 21, wherein: the fixed connection of the polymer layers comprises the step of using a self-adhesive waterproof tape or a self-adhesive waterproof coiled material to bond the polymer layers of the two adjacent composite pipes.

23. The piping system of claim 22, wherein: the inner surfaces of the concrete pipes of the two adjacent composite pipes are provided with glue injection grooves which are simultaneously connected with the concrete layers of the two adjacent composite pipes; the two adjacent composite pipes are fixedly connected with each other, and the two adjacent composite pipes are connected by the sealant injected into the glue injection groove.

24. The piping system of claim 23, wherein: the bottom size of the glue injection groove is larger than the opening size.

25. The piping system of claim 19, wherein: the pipeline system further comprises at least one of a connecting bent pipe, a three-way pipe, an inspection well or a coiled well which are connected with the composite pipe.

26. A mould for manufacturing a composite pipe according to any one of claims 1 to 18, wherein the mould comprises a tray bottom mould and an inner mould and an outer mould which are respectively and movably connected with the tray bottom mould; the outer die is an openable outer die, the inner die is a telescopic inner die, and the inner die is provided with a preset piece fixing piece for fixing the preset piece;

the inner die comprises a telescopic die plate and an inner die driving device for driving the telescopic die plate to move;

The telescopic template comprises four corner telescopic plates positioned at corners and side telescopic plates positioned between every two corner telescopic plates;

The telescopic template further comprises telescopic fixing plates which are respectively connected with two adjacent corner telescopic plates in a sliding manner, and rotating plates which are respectively connected with the adjacent corner telescopic plates and the adjacent side telescopic plates in a rotating manner;

the telescopic template further comprises a fixing block which is slidably arranged on the side telescopic plate, and fixing holes matched with the fixing block are further formed in the telescopic fixing plate.

27. The mold according to claim 26, wherein: the outer die comprises a fixed part, a first movable part movably connected with the fixed part through a first rotating shaft, a first driving device for driving the first movable part to move, a second movable part movably connected with the fixed part through a second rotating shaft and a second driving device for driving the second movable part to move.

28. The mold according to claim 26 or 27, characterized in that: the internal mold driving device comprises an internal mold power device, a corner expansion plate connecting piece which is respectively and movably connected with the corner expansion plate and the internal mold power device, and a side expansion plate connecting piece which is respectively and movably connected with the side expansion plate and the internal mold power device.

29. The mold according to claim 28, wherein: the bottom of the side expansion plate is also provided with a clamping piece which can be clamped with the tray bottom die.

30. The mold according to claim 29, wherein:

the internal mold driving device comprises an upper internal mold driving device;

The upper portion expansion plate connecting piece includes first side expansion plate connecting rod, second side expansion plate connecting rod and third side expansion plate connecting rod, first side expansion plate connecting rod and first sliding block swing joint, the second side expansion plate connecting rod with third side expansion plate connecting rod respectively with first side expansion plate connecting rod swing joint, and the second side expansion plate connecting rod with side expansion plate swing joint, the third side expansion plate connecting rod with fixed block swing joint.

31. The mold according to claim 30, wherein: the internal mold driving device further comprises a lower internal mold driving device;

the lower side expansion plate connecting piece comprises a fourth side expansion plate connecting rod, a fifth side expansion plate connecting rod and a sixth side expansion plate connecting rod, wherein the fourth side expansion plate connecting rod is movably connected with the second sliding block, the fifth side expansion plate connecting rod and the sixth side expansion plate connecting rod are respectively movably connected with the fourth side expansion plate connecting rod, and the fifth side expansion plate connecting rod and the sixth side expansion plate connecting rod are respectively movably connected with the side expansion plate.

32. The mold according to claim 31, wherein: the first internal mold power source and the second internal mold power source are the same power source, and the power source synchronously drives the corner expansion plate connecting pieces and the side expansion plate connecting pieces at the upper part and the lower part to enable the internal mold to synchronously expand and contract.

33. The mold according to claim 32, wherein: the same power source is a hydraulic cylinder.

34. A mould according to any one of claims 29 to 33, wherein: the inner die and the outer die respectively comprise at least one template unit; the template unit comprises a plastic plate, a transverse supporting piece and a longitudinal supporting piece, wherein the transverse supporting piece and the longitudinal supporting piece are fixedly connected with the plastic plate.

35. The mold according to claim 34, wherein: the transverse supporting piece comprises a steel plate body, and the steel plate body is provided with a mounting hole; the transverse supporting piece is fixedly connected with the plastic plate by using bolts to fix the transverse supporting piece with nuts embedded in the plastic plate in the mounting holes along the direction perpendicular to the plastic plate; the longitudinal support piece is fixedly connected with the transverse support piece.

36. A method of manufacturing a composite tube using the mold of any of claims 26-35, comprising: