CN214534901U - Staggered reinforced polyethylene winding composite pipe - Google Patents
Staggered reinforced polyethylene winding composite pipe Download PDFInfo
- Publication number
- CN214534901U CN214534901U CN202120636762.6U CN202120636762U CN214534901U CN 214534901 U CN214534901 U CN 214534901U CN 202120636762 U CN202120636762 U CN 202120636762U CN 214534901 U CN214534901 U CN 214534901U
- Authority
- CN
- China
- Prior art keywords
- pipe
- strip
- hollow reinforcing
- width
- cavity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Lining Or Joining Of Plastics Or The Like (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
Abstract
The utility model relates to a crisscross enhancement polyethylene winding composite pipe, include the body that is formed by overlapping the bonding of strip spiral winding, the spiral winding bonds and is the bellied cavity additional strengthening of heliciform in the body outward appearance, and the strip spiral winding becomes the body after in the body outward appearance formation concave part, and cavity additional strengthening includes that cavity strengthens main part and cavity and strengthens the clamping piece that the main part side extends and form, and cavity additional strengthening overlaps on the strip overlaps the position and forms the crisscross bonding structure that overlaps of multilayer, and the inside joint limit that forms during the strip spiral winding and external limit all are in within cavity additional strengthening's width. After the pipe body is formed by spirally winding the strip, the clamping pieces and the strip are in a multilayer overlapping and bonding structure, and the reinforcing structure forms a multilayer staggered overlapping structure through the clamping pieces and the strip, so that the strength of a bonding part is improved, multiple axial acting force resultant force is formed simultaneously, the axial acting force of the composite pipe is dispersed, and the safety coefficient of the composite pipe is improved.
Description
Technical Field
The utility model belongs to the pipeline field especially relates to a crisscross enhancement polyethylene winding composite pipe.
Background
The corrugated pipe is a novel pipe with an outer wall of an annular structure and a smooth inner wall, the wound corrugated pipe is a pipe with unlimited length obtained in a continuous winding mode, the corrugated pipe is a novel light pipe which mainly uses high-density polyethylene as a raw material, the outer wall is of an annular corrugated structure, and the annular rigidity of the pipe is greatly enhanced, so that the resistance of the pipe to soil load is enhanced, and the corrugated pipe has the characteristics of light weight, high pressure resistance, good toughness, quick construction and the like and is applied to replace concrete pipes and cast iron pipes.
In order to improve the production efficiency, simplify the forming process and reduce the production cost, the prior corrugated pipe mostly adopts a winding forming structure, a pipe body is formed by winding, and an annular structure is also formed by winding.
However, in the winding process, the strength of the corrugated pipe is considered to be higher in the overlapping winding bonding than in the butt winding bonding, but in any case, the bonding part is still present in the spiral winding, so that how to improve the strength of the bonding part is an important factor to be considered in the composite pipe forming.
Disclosure of Invention
The utility model provides a crisscross enhancement polyethylene winding composite pipe extends the clamping piece as the corrugated additional strengthening side of outward appearance, behind the strip spiral winding shaping body, the clamping piece is the multilayer and overlaps the bonding structure with the strip, and additional strengthening passes through the clamping piece and forms the crisscross overlapping structure of multilayer with the strip moreover to improve the intensity at bonding position, form multiple axial effort resultant force simultaneously, the compound tubular axial effort of dispersion improves the factor of safety of composite pipe.
The utility model discloses a concrete technical scheme does: the utility model provides a crisscross reinforcing polyethylene winding composite pipe, include the body that is formed by the overlapping of belt material spiral winding, the spiral winding bonds and is the protruding cavity additional strengthening of heliciform in the body outward appearance, the belt material spiral winding forms the concave part in the body outward appearance behind the body, cavity additional strengthening includes that cavity strengthens main part and cavity and strengthens the clamping piece that the main part side extends and form, cavity additional strengthening overlaps on the belt material overlaps the position and forms the crisscross overlapping structure that bonds of multilayer, the interior limit that forms during belt material spiral winding and external limit all are in within the width of cavity additional strengthening.
The pipe body is formed by spirally winding and overlapping and bonding strips, the hollow reinforcing structure is overlapped and pressed at the overlapping position of the strips, and the composite pipe forms a multi-layer staggered and overlapped structure at the position of the hollow reinforcing structure, so that a bidirectional acting force is formed at the overlapping and bonding position of the strips, the axial action on the overlapping and bonding position of the strips is reduced, and the bonding is more reliable and stable; after the strips are spirally wound, overlapped and bonded into the pipe body, a concave part is formed on the outer surface of the pipe body, the concave part is formed when the strips are wound, a hollow groove is formed by closing the concave part when the hollow reinforcing structure is spirally wound, and the hollow groove provides a deformed accommodating space for the composite pipe, so that the composite pipe can be deformed towards the hollow groove part in the cooling process, the deformation in the direction does not influence the inner shape of the composite pipe, and the strength of the composite pipe cannot be weakened; the hollow reinforcing structure extends out of the clamping piece from the side edge of the hollow reinforcing main body, and when the hollow reinforcing main body is spirally wound, the hollow reinforcing main body is overlapped at the overlapping part of the strip materials, or the clamping piece is overlapped at the overlapping part of the strip materials; the inner joint edge and the outer joint edge represent that the side edges of the adjacent strips are butted to form when the strips are spirally wound, the inner joint edge is positioned on the inner surface of the tube body, the outer joint edge is positioned on the outer surface of the tube body, the inner joint edge and the outer joint edge are positioned within the width of the hollow reinforcing structure, and the inner joint edge and the outer joint edge are compressed and protected by the hollow reinforcing structure.
According to the preferable scheme, the strip is of a sheet structure, an upper overlapping edge and a lower overlapping edge are arranged on two sides of the strip, and the upper overlapping edge and the lower overlapping edge are of complementary step structures; the width of the upper overlapping edge is smaller than that of the lower overlapping edge, the upper overlapping edge is overlapped on the lower overlapping edge, and a concave part on the outer surface of the pipe body is formed at a position where the width of the lower overlapping edge is larger than that of the upper overlapping edge. The strip has an upper overlapping edge and a lower overlapping edge, the upper overlapping edge and the lower overlapping edge are overlapped and bonded during spiral winding, the bonding surface is positioned on the axial circumferential surface, the hollow reinforcing structure and the overlapped bonding surface of the pipe body are positioned on the axial circumferential surface as well, and the hollow reinforcing structure and the axial resistance of the composite pipe are positioned in the same direction, so that the axial resistance of the composite pipe is improved.
Preferably, the inner edge is located below the clip outside the hollow reinforcing body, and the width of the concave part outside the pipe body is smaller than or equal to the width of the hollow reinforcing body. The internal edge is positioned below the clamping piece, the width of the concave part is smaller than or equal to the width of the hollow reinforcing main body, namely, the external edge is positioned at the side edge close to the hollow reinforcing main body or below the hollow reinforcing main body, so that the length of the strip which is overlapped and bonded in the axial direction is increased, and the integral strength of the pipe body is improved.
Preferably, the hollow reinforcing structure is spirally wound and bonded outside the pipe body and seals the concave part to form a hollow groove, and a steel belt is spirally wound in the hollow groove; the steel belt is of a flat structure, and the plane of the flat steel belt is attached to the bottom of the concave part; or the steel strip is in a corrugated structure, and the undulation direction of the corrugation is along the axial direction of the composite pipe. The hollow reinforcing structure seals the concave part to form a hollow groove, and simultaneously, a steel belt is wound in the hollow groove, so that the ring stiffness of the composite pipe is improved; the spiral winding position of the steel belt is positioned on the outer surface of the pipe body, which is equivalent to the effect of binding the pipe body and improves the safety and stability of the pipe body.
Preferably, the width of the clamping piece is the width of the bottom of a wave trough between adjacent wave crests on the outer surface of the composite pipe, and the clamping piece of the front circle of hollow reinforcing structure is in butt joint with the side edge of the rear circle of hollow reinforcing main body.
Preferably, the width of the clamping piece is larger than the width of the bottom of the wave trough between adjacent wave crests on the outer surface of the composite pipe, and the bottom of the rear circle of hollow reinforcing main body is overlapped and bonded on the clamping piece of the front circle of hollow reinforcing structure. The width of the clamping piece is larger than that of the wave valley bottom, so that the rear circle of hollow reinforcing body is overlapped on the clamping piece and the upper lap joint edge of the front circle of hollow reinforcing structure, the positions where the hollow reinforcing body is wound and overlapped are not the same circumferential surface, the hollow reinforcing body can incline in the winding process, and the inclination can exactly compensate the inclination of the linear hollow reinforcing structure in spiral winding.
As the preferred scheme, the surface of strip is provided with the roughness, and the corresponding position of cavity additional strengthening is provided with the roughness, and when cavity additional strengthening spiral winding was outside the body, the roughness was corresponding each other, and cavity additional strengthening covers the exposed roughness of body. The rough part strengthens the bonding force between the spiral reinforcing structure and the pipe body.
Preferably, the surface of the roughness is a saw-tooth structure, and the tips of the saw teeth extend along the length of the strip.
As a preferred scheme, the hollow reinforcing main body adopts a trapezoidal structure formed by double-layer co-extrusion of an inner PP inner pipe and an outer PE layer, or the hollow reinforcing main body adopts a trapezoidal structure formed by three-layer co-extrusion of an inner PE inner layer, a middle PP inner pipe and an outer PE layer; wherein the PP inner pipe is of a circumferential closed structure; the clamping piece is formed by extending the PE outer layer. The spiral reinforcing structure is provided with a PP inner pipe made of PP, the PP inner pipe is coated outside, and the PE outer layer improves the ring stiffness of the composite pipe, and meanwhile, the use amount of PE can be reduced, and the cost is reduced.
As the preferred scheme, the hollow reinforcing main body adopts double PP inner pipes, the two PP inner pipes are of a right-angle trapezoidal structure, and the two right-angle sides are opposite and bonded.
The utility model has the advantages that: 1. the pipe body is formed by spirally winding and overlapping and bonding strips, the hollow reinforcing structure is overlapped and pressed at the overlapping position of the strips, and the composite pipe forms a multi-layer staggered and overlapped structure at the position of the hollow reinforcing structure, so that a bidirectional acting force is formed at the overlapping and bonding position of the strips, the axial action on the overlapping and bonding position of the strips is reduced, and the bonding is more reliable and stable;
2. after the strips are spirally wound, overlapped and bonded into the pipe body, a concave part is formed on the outer surface of the pipe body, the concave part is formed when the strips are wound, a hollow groove is formed by closing the concave part when the hollow reinforcing structure is spirally wound, and the hollow groove provides a deformed accommodating space for the composite pipe, so that the composite pipe can be deformed towards the hollow groove part in the cooling process, the deformation in the direction does not influence the inner shape of the composite pipe, and the strength of the composite pipe cannot be weakened;
3. the hollow reinforcing structure extends out of the clamping piece from the side edge of the hollow reinforcing main body, and when the hollow reinforcing main body is spirally wound, the hollow reinforcing main body is overlapped at the overlapping part of the strip materials, or the clamping piece is overlapped at the overlapping part of the strip materials; the inner joint edge and the outer joint edge represent that the side edges of the adjacent strips are butted to form when the strips are spirally wound, the inner joint edge is positioned on the inner surface of the tube body, the outer joint edge is positioned on the outer surface of the tube body, the inner joint edge and the outer joint edge are positioned within the width of the hollow reinforcing structure, and the inner joint edge and the outer joint edge are compressed and protected by the hollow reinforcing structure.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic structural diagram of embodiment 2 of the present invention;
FIG. 3 is an exploded view of the structure of FIG. 2 in accordance with the present invention;
fig. 4 is a schematic structural diagram of embodiment 3 of the present invention;
fig. 5 is an exploded schematic view of embodiment 4 of the present invention;
fig. 6 is an exploded schematic view of embodiment 5 of the present invention;
fig. 7 is a schematic structural view of a hollow reinforcing structure according to the present invention;
FIG. 8 is a schematic structural view of another hollow reinforcing structure of the present invention;
in the figure: 1. hollow additional strengthening, 2, body, 3, clamping piece, 4, inscription limit, 5, go up the overlap edge, 6, strip, 7, lower overlap edge, 8, dead slot, 9, coarse portion, 10, steel band, 11, PE skin, 12, PP inner tube, 13, PE inlayer, 14, right angle side.
Detailed Description
The invention will be further described with reference to specific embodiments and with reference to the accompanying drawings.
Example 1:
as shown in figure 1, the staggered reinforced polyethylene winding composite pipe comprises a pipe body 2 formed by spirally winding, overlapping and bonding a strip material 6, and a hollow reinforcing structure 1 spirally wound and bonded on the outer surface of the pipe body and spirally protruded, wherein a concave part is formed on the outer surface of the pipe body after the strip material is spirally wound into the pipe body. The hollow reinforcing structure comprises a hollow reinforcing main body and a clamping piece 3 formed by extending the side edge of the hollow reinforcing main body, the hollow reinforcing structure is overlapped on the overlapping part of the strip and forms a multilayer staggered overlapping bonding structure, and an inner connecting edge 4 and an outer connecting edge formed when the strip is spirally wound are both positioned within the width of the hollow reinforcing structure.
The strip is sheet structure, and the both sides of strip are provided with overlap edge 5 and overlap edge 7 down, go up overlap edge and overlap edge down and be complementary stair structure down, and the thickness of going up the overlap edge equals with the thickness on overlap edge down, and all is less than 1/2 of strip thickness slightly, goes up overlap edge and overlaps on overlap edge down and bond, and thickness after the overlapping equals with strip thickness. The bonding surface is positioned on the axial circumferential surface, the hollow reinforcing structure and the overlapped bonding surface of the pipe body are also positioned on the axial circumferential surface, and the hollow reinforcing structure and the axial resistance of the composite pipe are positioned in the same direction. The width of going up the overlap edge is less than the width of overlap edge down, goes up the overlap edge and overlaps on overlap edge down, and the width of overlap edge is less than cavity additional strengthening's money and is anger greatly down, and the width of overlap edge is greater than the width that the main part was strengthened to cavity down, and the position that the overlap edge width is greater than last overlap edge width down forms the apparent concave part of body. After the strip material is spirally wound and formed, the inner connecting edge is positioned below the clamping piece.
The width of concave part and the width that the main part was strengthened to the cavity are equal, and cavity additional strengthening spiral winding is outside the body, and the cavity is strengthened the main part and just in time is overlapped in concave part department, goes up the side of overlap edge and bonds mutually with the side that the main part was strengthened to corresponding cavity, and the clamping piece overlaps on last overlap edge, and clamping piece, last overlap edge and lower overlap edge form the crisscross bonding structure that overlaps of three-layer.
The width of clamping piece is the axial length of trough bottom between the two adjacent wave crests of compound outside of tubes surface, and the clamping piece of preceding round cavity additional strengthening connects the bonding with the side of the main part is strengthened to back round cavity relatively, and the width of clamping piece is greater than the width of last overlap edge, and the bottom surface and the cavity of clamping piece are strengthened the outer bottom surface not parallel and level of main part, have a difference in height between two bottom surfaces, and this difference in height is the thickness on overlap edge.
The whole PE extrusion moulding that adopts of cavity additional strengthening, cavity additional strengthening main part are the trapezium structure, and inside has circumference confined cross section and is trapezoidal well cavity.
Or the hollow reinforcing main body adopts a trapezoidal structure formed by double-layer co-extrusion of an inner PP pipe 12 and an outer PE layer 11, and the clamping piece is formed by extending the side edge of the outer PE layer.
Example 2:
as shown in fig. 2 and fig. 3, an interlaced reinforced polyethylene winding composite pipe is different from the example 1 in that: the width of concave part is less than the width of cavity reinforcing body, and when cavity additional strengthening twined outside the body, cavity reinforcing body closed concave part formed dead slot 8, and cavity additional strengthening's clamping piece overlaps on last overlap joint edge. The bottom surface of the clamping piece is flush with the bottom surface of the hollow reinforcing main body, and two sides of the bottom surface of the hollow reinforcing main body are respectively overlapped on the middle outer surface of the front circle of belt material and the upper lap edge outer surface of the rear circle of belt material. The rest of the structure is referred to example 1.
Example 3:
as shown in fig. 4, an interlaced reinforced polyethylene wound composite pipe is different from example 2 in that: the width of clamping piece is greater than the axial length of trough bottom between the two adjacent wave crests of composite tube external surface, the main part bottom is strengthened in the cavity of back round overlaps and bonds on the clamping piece of preceding round cavity additional strengthening structure, the cavity is strengthened on the main part bottom left side and is overlapped on the position that strip and clamping piece overlap and bond, the right side overlaps on the overlap edge on the strip and the position that lower overlap edge overlap and bond, like this, the left side that is equivalent to the cavity additional strengthening body is higher than the thickness of a clamping piece on the right side, this difference in height just is suitable for as the maintenance for the slope of cavity additional strengthening structure when the spiral winding, that is to say that the cavity additional strengthening structure spiral winding is revised after and is just standing the form. The rest of the structure is referred to example 2.
Example 4:
as shown in fig. 5, an interlaced reinforced polyethylene wound composite pipe is different from example 2 in that: the surface of the strip is provided with rough parts 9, the corresponding parts of the hollow reinforcing structures are provided with rough parts, when the hollow reinforcing structures are spirally wound outside the pipe body, the rough parts correspond to each other, and the hollow reinforcing structures cover the exposed rough parts of the pipe body. The surface of the rough part is of a saw-toothed structure, and the tooth tops of the saw teeth extend along the length direction of the strip. In this embodiment, the rough part of the hollow reinforcing structure is located at two side positions of the bottom surface of the hollow reinforcing body, and the rough part of the strip is located at two side positions of the outer surface of the upper lap edge of the strip. After the hollow reinforcing structure is spirally wound, the rough parts are correspondingly engaged with each other and then just positioned at two sides of the concave part. The rest of the structure is referred to example 2.
Example 5:
as shown in fig. 6, an interlaced reinforced polyethylene wound composite pipe is different from example 2 in that: the hollow reinforcing structure is spirally wound and bonded outside the pipe body and seals the concave part to form a hollow groove, a steel belt 10 is spirally wound in the hollow groove, the steel belt is of a flat structure, the plane of the flat steel belt is attached to the bottom of the concave part, or the steel belt is of a corrugated structure, and the undulation direction of the corrugation is along the axial direction of the composite pipe. In this embodiment, the width of the steel strip is equal to the width of the concave portion, and both sides of the steel strip are in contact with both sides of the concave portion. The steel belt adopts trapezoidal buckled plate, and the both sides of steel belt are turned over perpendicularly, and the whole height of trapezoidal buckled plate equals with the height of dead slot. The strip is spirally wound and overlapped to form a concave part, the steel strip 11 is spirally wound in the concave part, and finally the spiral reinforcing structure is spirally wound to close the concave part. The rest of the structure is referred to example 2.
Example 6:
as shown in fig. 7, the hollow reinforced structure of the present embodiment adopts a trapezoidal structure formed by co-extruding three layers, and includes an inner PE layer 13, an inner PP pipe 12 in the middle, and an outer PE layer 11, where the inner PP pipe is a circumferential closed structure. The clamping piece is formed by extending the side edge of the PE outer layer.
Example 7:
as shown in FIG. 8, the hollow reinforced structure of the interlaced reinforced polyethylene winding composite pipe of this embodiment is a double PP inner pipe structure, both PP inner pipes are in a right trapezoid structure, and the right-angled sides 14 of the two PP inner pipes are opposite and bonded. The outer parts of the two PP inner pipes are PE outer layers.
The above, only be the utility model discloses a preferred embodiment, it is not right the utility model discloses do any restriction, all according to the utility model discloses the technical entity all still belongs to any simple modification, change and equivalent transformation of doing above embodiment the utility model discloses technical scheme's protection scope.
Claims (10)
1. The utility model provides a crisscross reinforcing polyethylene winding composite pipe, a serial communication port, include body (2) that form by bonding of strip (6) spiral winding overlap, spiral winding bonds and is the protruding cavity additional strengthening (1) of heliciform in body outward appearance, the strip spiral winding becomes the body after the concave part is formed in body outward appearance, cavity additional strengthening includes that cavity strengthens main part and cavity and strengthens clamping piece (3) that the main part side extends and form, cavity additional strengthening overlaps on the strip overlaps the position and forms the crisscross bonding structure that overlaps of multilayer, the interior limit that forms during strip spiral winding and external limit all are in within cavity additional strengthening's width.
2. The interlaced reinforced polyethylene wound composite pipe of claim 1, wherein the strip has a sheet-like structure, the strip is provided with an upper overlapping edge (5) and a lower overlapping edge (7) on two sides, and the upper overlapping edge and the lower overlapping edge have a complementary step structure; the width of the upper overlapping edge is smaller than that of the lower overlapping edge, the upper overlapping edge is overlapped on the lower overlapping edge, and a concave part on the outer surface of the pipe body is formed at a position where the width of the lower overlapping edge is larger than that of the upper overlapping edge.
3. The interlaced reinforced polyethylene wound composite pipe of claim 1 or claim 2, wherein the inner flange is below the clip outside the hollow reinforcing body, and the width of the recess outside the body is less than or equal to the width of the hollow reinforcing body.
4. The interlaced reinforced polyethylene clad pipe of claim 3, wherein the hollow reinforcing structure is spirally wound and bonded outside the pipe body and closes the concave portion to form a hollow groove (8), and a steel strip (10) is spirally wound in the hollow groove; the steel belt is of a flat structure, and the plane of the flat steel belt is attached to the bottom of the concave part; or the steel strip is in a corrugated structure, and the undulation direction of the corrugation is along the axial direction of the composite pipe.
5. The interlaced reinforced polyethylene clad pipe of claim 1 wherein said clips are of a width corresponding to the width of the bottoms of the troughs between adjacent peaks on the outside of the clad pipe, the clips of the first ring of hollow reinforcing structures being bonded to the sides of the next ring of hollow reinforcing bodies in abutting relationship.
6. The interlaced reinforced polyethylene clad pipe of claim 1 wherein said clips have a width greater than the width of the bottoms of the troughs between adjacent peaks on the outside of the clad pipe, the bottom of the next ring of hollow reinforcing bodies overlapping and bonded to the clips of the previous ring of hollow reinforcing structures.
7. The interlaced reinforced polyethylene clad pipe of claim 1, 2, 5 or 6 wherein the surface of the strip has rough portions (9), the corresponding portions of the hollow reinforcing structures have rough portions, the rough portions correspond to each other when the hollow reinforcing structures are spirally wound outside the pipe body, and the hollow reinforcing structures cover the exposed rough portions of the pipe body.
8. The interlaced reinforced polyethylene clad pipe of claim 7 wherein the roughened surface is a saw tooth configuration, the crests of the saw teeth extending along the length of the strip.
9. The interlaced reinforced polyethylene winding composite pipe according to claim 1, 2, 5 or 6, wherein the hollow reinforcing body is a ladder-shaped structure formed by double-layer co-extrusion of an inner PP pipe (12) and an outer PE layer (11), or a ladder-shaped structure formed by triple-layer co-extrusion of an inner PE layer (13), a middle PP pipe and an outer PE layer; wherein the PP inner pipe is of a circumferential closed structure; the clamping piece is formed by extending the PE outer layer.
10. An alternate reinforced polyethylene wound composite pipe according to claim 1 or 2 or 5 or 6, wherein the hollow reinforcing body is a double PP inner pipe, both PP inner pipes are of right trapezoid configuration, and the right-angled sides (14) are opposed and bonded.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021528296 | 2020-07-29 | ||
| CN2020215282961 | 2020-07-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214534901U true CN214534901U (en) | 2021-10-29 |
Family
ID=78266692
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120636762.6U Active CN214534901U (en) | 2020-07-29 | 2021-03-30 | Staggered reinforced polyethylene winding composite pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214534901U (en) |
-
2021
- 2021-03-30 CN CN202120636762.6U patent/CN214534901U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| TWI409162B (en) | Composite reinforced strip windable to form a helical pipe and method therefor | |
| CN111810733A (en) | Reinforced polyethylene winding composite pipe | |
| CN214534901U (en) | Staggered reinforced polyethylene winding composite pipe | |
| CN213064944U (en) | Hollow PP reinforced polyethylene winding pipe | |
| JPH0148435B2 (en) | ||
| CN212839852U (en) | PP double-high-strength polyethylene winding composite pipe | |
| CN209743801U (en) | HDPE double-rib reinforced structure wall pipe | |
| CN2882985Y (en) | Metal reinforced plastic strips and metal reinforced plastic drainage pipe made therefrom | |
| CN212743159U (en) | Corrugated sandwich board | |
| CN215215130U (en) | Compound reinforced pipe of inside and outside two pressure-bearing porous frameworks | |
| CN114132012A (en) | Environment-friendly material core material modularized assembled pipeline and manufacturing method thereof | |
| CN112524350B (en) | Hollow structure wall winding pipe with high connection strength | |
| CN210318871U (en) | High-strength steel strip reinforced corrugated pipe | |
| CN201014064Y (en) | Steel plastic compound tube | |
| CN212900187U (en) | Multilayer composite reinforced helical bellows | |
| CN203309383U (en) | Reinforcement type krah pipe | |
| EP1275445B1 (en) | Flexible metal conduit | |
| CN214093387U (en) | PP double-high-rib reinforced polyethylene winding pipe | |
| CN213512465U (en) | Metal reinforced composite pipe | |
| CN220706770U (en) | Novel compound winding pipe | |
| CN212900167U (en) | Buried PVC composite pipe with internal reinforcing rib structure | |
| CN2641418Y (en) | Honeycomb like, composition, multi-layer and spiral wound tube | |
| KR950007033Y1 (en) | Corrugated pipes | |
| CN2793490Y (en) | Steel-plate reinforced composite plastic pipe | |
| CN214579411U (en) | Plastic composite pipe with steel wire winding |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |