CN203052176U

CN203052176U - Externally-square internally-round double-layer composite corrugated tube

Info

Publication number: CN203052176U
Application number: CN 201220697485
Authority: CN
Inventors: 周成立
Original assignee: Individual
Current assignee: FUJIAN HOSHING PLASTICS CO LTD
Priority date: 2012-12-17
Filing date: 2012-12-17
Publication date: 2013-07-10
Anticipated expiration: 2022-12-17

Abstract

The utility model provides an externally-square internally-round double-layer composite corrugated tube which comprises an outer layer and an inner layer, wherein the external form of the composite corrugated tube is square and formed by the outer layer; and the inner layer is of a corrugated structure with staggered circles and squares ( the wave trough portions are round, the wave crest portions are square and the square portions are provided with round corners), the outer layer and the inner layer are welded together in a hot-fusion mode, the outer layer is a smooth structural layer, and the inner layer is machined to be corrugated. The externally-square internally-round double-layer composite corrugated tube is good in construction convenience, and high in bending strength, ring stiffness and stretching resistance and can meet requirements for non-excavation construction.

Description

Square-outside and round-inside two-layer compound bellows

Technical field

The utility model relates to a kind of industrial tubing, relates in particular to a kind of square-outside and round-inside two-layer compound bellows.

Background technique

Present power cable, the communication sheath, the tubing in fields such as draining blowdown is generally polypropylene single-wall corrugated pipe and HDPE double-wall corrugated pipe, their structure is circle, wherein there is following shortcoming in the polypropylene single-wall corrugated pipe: 1, because it is round structure, tubing need add the tubulature pillow when mounted, (pipe is when stacking layer by layer so that it can be fixed, as not installing the outside square pipe pillow that is additional, tubing will roll, cause and can not install), therefore, the tubing construction is more loaded down with trivial details, the human cost height, inefficiency because using extra pipe pillow, has therefore improved cost again in addition; 2, because being round structure, its vertical surface strength is not as square pipe, therefore compressive strength is slightly poor, simultaneously because round structure, to having relatively high expectations of ground, be that point contacts with ground, pressure over the ground is higher, when being subjected to weight, destroy ground easily, cause pipe-line system to be in operation and occur unusually; 3, because being single layer structure, in strength structural imperfection is arranged, ring stiffness is relatively low, and the longitudinal strength of tubing is not high yet, and is crooked easily; 4, because its outer wall all is corrugated, cause tubing when non-excavating construction, the frictional force of outer pipe wall and soil is bigger, and the stretching resistance deficiency can easily be broken, and can't satisfy the non-excavating construction requirement; 5, because it has only one deck wall, so the shock resistance destructiveness is compared with double-deck compound enhancing tubing, and there is a big difference.

There is following shortcoming in the HDPE double-wall corrugated pipe: be round structure because of it 1,, tubing need add the tubulature pillow when mounted, and (pipe is when stacking layer by layer, as not installing the outside square pipe pillow that is additional so that it can be fixed, tubing will roll, cause and can not install), therefore, the tubing construction is more loaded down with trivial details, the human cost height, inefficiency because using extra pipe pillow, has therefore improved cost again in addition; 2, because being round structure, its vertical surface strength is not as square pipe, therefore compressive strength is slightly poor, simultaneously because round structure, to having relatively high expectations of ground, be that point contacts with ground, pressure over the ground is higher, when being subjected to weight, destroy ground easily, cause pipe-line system to be in operation and occur unusually; 3, the HDPE material is softer, and ring stiffness is low; 4, vicat temperature is lower, can not satisfy electric power to the requirement of high security; 5, outer wall ripple, when non-excavating construction and soil frictional force big, the stretching resistance deficiency can easily be broken, and can't meet the demands.

The model utility content

The technical problems to be solved in the utility model is to provide that a kind of construction convenience is good, flexural strength is high, compressive strength is high, and stretching resistance is strong, and satisfies the square-outside and round-inside two-layer compound bellows of non-excavating construction requirement.

The utility model is achieved in that a kind of square-outside and round-inside two-layer compound bellows, comprise skin and internal layer, be welded together by hot melt between described skin and the internal layer, the profile of described tubing is square, described skin is processed as the smooth structure layer, and internal layer is processed as corrugated or shape of threads, and the trough place of internal layer is circular arc, the crest place of internal layer is square and outer welding, and square edge is processed as fillet.

Described square for having the square or rectangular of fillet, size is not limit.

Described outer field thickness is 1-20mm.

The thickness of described internal layer is 1-10mm.

Described skin and internal layer are modified polypropene or other material modified construction layer.

The crest width of described corrugated internal layer is 10-150mm, is the staggered ripple struction in circle-side.

The trough arc radius of described corrugated internal layer is 5-200mm.

The utility model square-outside and round-inside two-layer compound bellows has following advantage: 1, because profile is square, so installation is good, can not need other tubulature pillow, only need tie up with rope to get final product, and saves manpower and cost of material, and efficiency of construction improves, and comprehensive cost reduces; 2, because skin is smooth, the smooth structure layer, form stable triangle with internal layer, thereby can greatly promote compressive strength and the bending pipes intensity of tubing, 3, because skin is square structure, internal layer is round structure, well used for reference the strength advantage of two kinds of structures, such as: square skin can improve the vertical surface compressive strength of tubing, and the round structure of internal layer has then well disperseed the external force from 360 degree directions, therefore, the compressive strength of tubing is greatly improved, and simultaneously because of square structure, the surface of contact of tubing and ground is big, pressure to the unit area of ground is less, and survivable ground causes pipe-line system unusual when being subjected to weight; 4, because its skin is smooth smooth structure, thereby the frictional force of tubing and soil is less when being used for non-excavating construction, can satisfy the non-excavating construction requirement; 5, material modified because of the modified polypropene of selecting good heat resistance for use or other, so the good heat resistance of tubing; 6, because tubing is double-walled construction, so its shock resistance is destructive good.

Description of drawings

In conjunction with the embodiments the utility model is further described with reference to the accompanying drawings.

Fig. 1 is the overall structure schematic representation of the utility model square-outside and round-inside two-layer compound bellows.

Embodiment

Come the utility model is described in detail below in conjunction with specific embodiment.

See also shown in Figure 1, it is a kind of square-outside and round-inside two-layer compound bellows described in the utility model, comprise skin 1 and internal layer 2, described outer 1 and internal layer 2 between be welded together by hot melt, outer 1 is the smooth structure layer, and internal layer 2 is processed as the staggered wave structure layer in circle-side, and namely the trough place of internal layer is circular arc, the crest place of internal layer is square and outer welding, and square edge is processed as fillet.

Outer 1 thickness is 1～20mm, employing is material modified through the modified polypropylene material of the good-toughness of modification or other, can improve anti-external damage performance, its structure is smooth, smooth, plays the effect of reinforcing waveform, and skin 1 forms stable triangle with internal layer 2, thereby can greatly promote compressive strength and the bending pipes intensity of tubing, be smooth smooth structure because of skin simultaneously, thereby the frictional force of tubing and soil is less when being used for non-excavating construction, can satisfy non-excavating construction.

The thickness of internal layer 2 is 1-10mm, adopt the modified polypropylene material of good strength or other material modified, its structure is circle-square structure, continuous wave (ripple) shape, play humidification, when reaching equality strength, more save material, the crest width of described undulatory internal layer 2 is 10-150mm, and the arc radius of trough is 5-200mm.

The production method of the utility model square-outside and round-inside two-layer compound bellows is: at first extrude internal layer with the A extruder, staggered typing module is shaped into the staggered single-wall corrugated pipe material in circle-side through circle-side, then extrude skin with the B extruder, under action of high temperature, by composite dies both are combined with each other, forming internal layer after square calibration sleeve typing is ripple struction, the composite corrugated tubing of outer smooth smooth double-walled, all can good bond under action of high temperature between two-layer, form whole; Skin of the present utility model and internal layer can be modified polypropene or other material modified construction layer, also can adopt the different materials of welding mutually of two kinds of difference in functionalitys.

Claims

1. square-outside and round-inside two-layer compound bellows, comprise skin and internal layer, be welded together by hot melt between described skin and the internal layer, it is characterized in that: the profile of described bellows is square, described skin is processed as the smooth structure layer, and internal layer is processed as corrugated or shape of threads, and the trough place of internal layer is circular arc, the crest place of internal layer is square and outer welding, and square edge is processed as fillet.

2. square-outside and round-inside two-layer compound bellows according to claim 1 is characterized in that: described square for having the square or rectangular of fillet.

3. square-outside and round-inside two-layer compound bellows according to claim 1, it is characterized in that: described outer field thickness is 1-20mm.

4. square-outside and round-inside two-layer compound bellows according to claim 1, it is characterized in that: the thickness of described internal layer is 1-10mm.

5. square-outside and round-inside two-layer compound bellows according to claim 1, it is characterized in that: described skin and internal layer are the modified polypropene construction layer.

6. square-outside and round-inside two-layer compound bellows according to claim 1, it is characterized in that: the crest width of described internal layer is 10-150mm.

7. square-outside and round-inside two-layer compound bellows according to claim 1, it is characterized in that: the trough arc radius of described internal layer is 5-200mm.