CN204554098U - A kind of screw thread bellows - Google Patents

Abstract

The utility model relates to a threaded corrugated pipe, which comprises a pipe body. The pipe body is fixedly connected with a ring-shaped pipe, and the ring-shaped pipe is wound around the outside of the pipe body in a threaded shape. The longitudinal section of the ring-shaped pipe is circular, and the width of the connection between the ring-shaped pipe and the pipe body is 1/4-3/4 of the outer diameter of the ring-shaped pipe. The ring-shaped tube is sequentially provided with a plastic outer layer, a first adhesive layer, a steel belt layer, a second adhesive layer, and a plastic inner layer from outside to inside, and the steel belt layer and the plastic outer layer pass through the The first adhesive layer is bonded, and the steel strip layer is bonded to the plastic inner layer through the second adhesive layer. The threaded corrugated pipe of the utility model has good corrosion resistance. The longitudinal section of the ring-shaped pipe of the utility model is circular, and the width of the connection between the ring-shaped pipe and the pipe body is 1/4-3/4 of the outer diameter of the ring-shaped pipe, compared with the inverted "U" in the prior art The corrugated corrugated tube with a ring-shaped structure has a larger contact area between the ring-shaped tube and the tube body, a larger force-bearing area, strong compression resistance, and high rigidity of the pipe ring.

Description

A threaded bellows

technical field

The utility model relates to a pipe material, in particular to a thread corrugated pipe.

Background technique

The existing HDPE structural wall thermal winding pipe (carat pipe) has the following disadvantages: First, the cost of the pipe is high: because it is made of all-plastic material, when a certain ring stiffness is reached, the amount of material used will increase significantly, and the plastic The price of the material itself is relatively expensive, so the cost of comprehensive materials is relatively high, which is about 30% higher than that of ordinary steel-plastic composite pipes. Second, it is impossible to produce super-large-diameter pipes: due to the all-plastic material, when producing large-diameter pipes, its compressive performance decreases in a three-dimensional manner. Therefore, it is impossible to produce pipes with a diameter of more than 3 meters, which is the biggest limitation of this product. . Third, the ring stiffness of the pipe is low: because it is made of all-plastic material, affected by the small bending modulus of the plastic itself, its compressive performance is low, and the ring stiffness is generally about 8kN/㎡.

The existing steel belt reinforced polyethylene (PE) spiral corrugated pipe for buried drainage has the following disadvantages: First, the ring stiffness is low: although the pipe adopts the steel-plastic composite method, due to structural defects, its waveform is inverted " The U" shape is hollow, and the compressive strength is still insufficient. Second, the corrosion resistance is poor: Although the steel strip has been treated with plastic coating on the surface, because the plastic coating itself is thin, generally about 1mm, if water flows into it during the production process or engineering application, it will be an inverted "U" In the waveform of the hollow structure, after a certain period of time, it is very easy to cause the separation of the plastic coating layer and the steel strip, and finally cause the corrosion of the steel strip and cause engineering accidents. Third, the mutual coverage between steel and plastic is poor: due to the inverted "U"-shaped hollow corrugated structure, nearly 40% of the area of the steel strip is not covered by the plastic layer, resulting in uneven force transmission when subjected to external forces, which is easy to Local stress concentration occurs, thereby destroying the pipeline and causing engineering accidents. Fourth, poor environmental adaptability: Due to the inverted "U"-shaped hollow corrugated structure, the steel and plastic are not fully covered. Under the influence of the external ambient temperature, the side that is not fully covered is prone to produce gaps between the steel and plastic due to thermal expansion and contraction. The separation between them will destroy the reinforcing effect of the steel strip and greatly reduce the anti-corrosion effect of the plastic layer on the steel strip. Fifth, the service life is short: due to structural defects, the problem of steel-plastic composite is not well overcome, and the steel-plastic separation phenomenon often occurs after a certain period of time, and the service life is generally about 10 years.

Utility model content

The purpose of the utility model is to provide a threaded corrugated pipe to overcome the problems of low rigidity of the ring of the corrugated pipe, poor corrosion resistance and poor cladding between steel and plastic in the prior art.

The utility model adopts the following technical scheme: a threaded corrugated pipe, including a pipe body, characterized in that: the pipe body is fixedly connected with a ring-shaped pipe, and the ring-shaped pipe is threaded around the outside of the pipe body , the longitudinal section of the ring-shaped tube is circular, and the width of the connection between the ring-shaped tube and the pipe body is 1/4-3/4 of the outer diameter of the ring-shaped tube; the ring-shaped tube is from outside to inside A plastic outer layer, a first adhesive layer, a steel belt layer, a second adhesive layer, and a plastic inner layer are arranged in sequence, and the steel belt layer is bonded to the plastic outer layer through the first adhesive layer , the steel strip layer is bonded to the plastic inner layer through the second adhesive layer.

Preferably, the width of the connection between the coiled tube and the tube body is 1/2 of the outer diameter of the coiled tube.

Preferably, the plastic outer layer is a polyethylene outer layer or a polypropylene outer layer.

Preferably, the plastic inner layer is a polyethylene inner layer or a polypropylene inner layer.

It can be seen from the above description of the structure and method of the utility model that, compared with the prior art, the utility model has the following advantages: First, the threaded bellows of the utility model has good corrosion resistance. Its two, the longitudinal section of the ring-shaped tube of the present utility model is annular, and the width that the ring-shaped tube is connected with the pipe body is 1/4-3/4 of the outer diameter of the ring-shaped tube, compared with the inverted one in the prior art The threaded corrugated pipe with "U" shape structure, the contact area between the ring pipe and the pipe body is larger, the force bearing area is larger, the compression resistance is strong, and the rigidity of the pipe ring is high. Its three, the utility model adopts polyethylene or polypropylene plastics, utilizes their good toughness characteristic admirably, and the threaded corrugated pipe has good toughness. Fourth, the threaded corrugated pipe of the utility model has good environmental adaptability: under the influence of the external environment temperature, the steel belt will generate corresponding displacement as much as possible with the thermal expansion and contraction of the plastic, and will not produce thermal expansion and cold contraction of the steel belt. The phenomenon of plastic detachment. Fifth, compared with all-plastic pipes, the cost of the threaded corrugated pipe of the present invention is low. Sixth, the utility model can produce super-large-diameter threaded corrugated pipes: due to the effective application of steel strips, the ring stiffness of the pipes can still be ensured when producing super-large-diameter pipes, meeting the requirements of some key projects. Seventh, the threaded corrugated pipe of the utility model has a long service life: the overall structure of the pipe is excellent, which perfectly integrates the characteristics of the steel strip and the plastic, greatly overcomes their respective congenital defects, and makes the performance of the plastic and the steel strip organically Unified, the service life of the pipe can reach more than 50 years.

Description of drawings

Fig. 1 is a schematic cross-sectional structure diagram of a threaded corrugated pipe of the present invention (only part of the threaded corrugated pipe is shown in the figure).

FIG. 2 is a schematic diagram of an enlarged structure of A in FIG. 1 .

Detailed ways

The specific embodiment of the utility model is described below with reference to accompanying drawing.

Referring to Fig. 1 and Fig. 2, a threaded corrugated pipe includes a pipe body 10, and the pipe body 10 is fixedly connected with a coiled pipe 11. The coil pipe 11 is threadedly wound around the outside of the pipe body 10 . The longitudinal section of the coiled pipe 11 is roughly circular. The width (marked as W in FIG. 2 ) of the connection between the coiled tube 11 and the tube body 10 is 1/4-3/4 of the outer diameter of the coiled tube (marked as D in FIG. 2 ). The coiled pipe 11 is sequentially provided with a plastic outer layer 12 , a first adhesive layer 13 , a steel belt layer 14 , a second adhesive layer 15 , and a plastic inner layer 16 from outside to inside. The steel belt layer 14 is bonded to the plastic outer layer through the first adhesive layer 13 , and the steel belt layer 14 is bonded to the plastic inner layer 16 through the second adhesive layer 15 .

1 and 2, the plastic outer layer 12 is a polyethylene outer layer or a polypropylene outer layer. The plastic inner layer 16 is a polyethylene inner layer or a polypropylene inner layer. The utility model adopts polyethylene or polypropylene plastics, which makes excellent use of their good toughness, and the threaded corrugated pipe has excellent toughness. Compared with the all-plastic pipe, the cost of the threaded corrugated pipe of the utility model is low.

Referring to Fig. 1, the threaded corrugated pipe of the present invention has good corrosion resistance. The longitudinal section of the ring-shaped tube 11 of the utility model is circular, and the width of the connection between the ring-shaped tube 11 and the pipe body 10 is 1/4-3/4 of the outer diameter of the ring-shaped tube 11, compared with the existing ones. For the threaded corrugated pipe with an inverted "U" structure, the contact area between the ring pipe 11 and the pipe body 10 is larger, the force bearing area is larger, the compression resistance is strong, and the pipe ring rigidity is high. Preferably, the width (marked as W in FIG. 2 ) that the coiled tube 11 is connected to the pipe body 10 is 1/2 of the outer diameter of the coiled tube 11 (marked as D in FIG. 2 ), so as to ensure the resistance of the coiled tube 11 pressure capacity. The threaded corrugated pipe of the utility model has good environmental adaptability: under the influence of the external environment temperature, the steel belt will produce a corresponding displacement as much as possible with the thermal expansion and contraction of the plastic, and there will be no separation of the steel and plastic after thermal expansion and cold contraction. Phenomenon.

The utility model can produce ultra-large-caliber threaded corrugated pipes: due to the effective application of steel strips, the ring stiffness of the pipes can still be ensured when producing ultra-large-diameter pipes, meeting the requirements of some key projects. The threaded corrugated pipe of the utility model has a long service life: the overall structure of the pipe is excellent, which perfectly integrates the characteristics of the steel strip and the plastic, and greatly overcomes their respective congenital defects, so that the properties of the plastic and the steel strip are organically unified. The service life can reach more than 50 years.

The above is only a specific embodiment of the utility model, but the design concept of the utility model is not limited thereto, and any non-substantial modification of the utility model by using this concept should be an act of violating the protection scope of the utility model.

Claims (4)

1. a screw thread bellows, comprise tube body, it is characterized in that: described tube body is fixedly connected with cast pipe, this cast pipe be shape of threads be set around the outside of described tube body, the longitudinal section of described cast pipe is circular, and the width that described cast pipe is connected with described tube body is the 1/4-3/4 of cast pipe external diameter; This cast pipe is disposed with plastic outer layer, the first adhesive layer, steel belt layer, the second adhesive layer, inner plastic from outside to inside, this steel belt layer is bonding by described first adhesive layer with described plastic outer layer, and this steel belt layer is bonding with described inner plastic by the second adhesive layer.

2. according to a kind of screw thread bellows according to claim 1, it is characterized in that: the width that described cast pipe is connected with described tube body is 1/2 of cast pipe external diameter.

3. according to a kind of screw thread bellows according to claim 1, it is characterized in that: described plastic outer layer is outer layer of polyethene or outer layer of polypropylene.

4. according to a kind of screw thread bellows according to claim 1, it is characterized in that: described inner plastic is polyethylene inner layer or inner layer of polypropylene.