CN217927567U

CN217927567U - Bent pipe type direct-buried large-caliber composite steel pipe joint-crossing protection structure

Info

Publication number: CN217927567U
Application number: CN202220787812.5U
Authority: CN
Inventors: 曹春建; 黄辉达; 方杰; 高成昊; 吴胜华
Original assignee: PowerChina Huadong Engineering Corp Ltd
Current assignee: PowerChina Huadong Engineering Corp Ltd
Priority date: 2022-04-06
Filing date: 2022-04-06
Publication date: 2022-11-29
Anticipated expiration: 2032-04-06

Abstract

The utility model provides a bent pipe type direct-buried large-caliber composite steel pipe gap-joint protection structure, which comprises a gap-joint pipeline positioned in a backfilled concrete structure, wherein a structural joint is arranged in the backfilled concrete structure; the joint-passing pipeline comprises a 90-degree elbow and a composite steel straight pipe connected to two ends of the elbow, the elbow penetrates through the structural joint, and the surface of the joint-passing pipeline sequentially comprises an asphalt hemp sheet, a polyethylene closed-cell foam board and a hemp rope from inside to outside. The technical scheme of the utility model, can satisfy the seam needs of crossing of straight tube type, bent cast heavy-calibre direct-burried composite steel pipe simultaneously, extensive applicability is general to directly wrap up flexible material such as pitch flaxen, polyethylene obturator cystosepiment more lightly, economy and convenient construction in seam pipeline surface, have good structural protection nature.

Description

Bent pipe type direct-buried large-caliber composite steel pipe joint-crossing protection structure

Technical Field

The utility model relates to a hydraulic and hydroelectric engineering field, concretely relates to cross seam protection architecture suitable for compound steel pipe of bent cast direct-burried heavy-calibre.

Background

In addition to the common single-material pipes such as carbon steel pipes and stainless steel pipes widely used in hydropower stations, in recent years, various large-caliber composite steel pipes (such as lining stainless steel composite steel pipes and steel-plastic composite steel pipes) have the advantages of inner and outer layers of metal pipes, and are further gradually buried in various concrete structures of hydropower stations. However, when the large-caliber composite steel pipe of a straight pipe type or a bent pipe type is buried in a concrete structure, the problem of passing through a concrete structure seam is inevitable, so that the composite steel pipe needs to be protected by passing the seam to adapt to the situations of uneven settlement, abnormal dislocation and the like of concrete at two sides of the structure seam, and further, the structural damage of the composite steel pipe at the concrete structure seam is avoided.

To this end, chinese utility model patent CN211472374U discloses a reinforced protection structure for pipeline passing through structural joint, which is to embolia a protection steel pipe outside the directly buried pipeline that needs to pass through the structural joint, and to set up flexible filling material between the directly buried pipeline and the protection steel pipe to effectively protect the pipeline passing through the joint. However, the above technical solutions can only solve the problem of pipeline joint crossing of the straight pipe type large-caliber composite steel pipe, and when the bent pipe type large-caliber composite steel pipe needs to pass through a concrete structural joint, the protection steel pipe cannot be sleeved into the bent pipe, so that the restraint is not effective.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome the shortcoming that exists among the prior art, provide a convenient construction, economical and practical and be applicable to the seam protection architecture of crossing of bent pipe type direct-burried heavy-calibre composite steel pipe.

In order to realize the purpose, the utility model discloses a technical scheme as follows:

a bent pipe type direct-buried large-caliber composite steel pipe joint protection structure comprises a joint pipeline positioned in a backfilled concrete structure, wherein a structural joint is arranged in the backfilled concrete structure; the joint-crossing pipeline comprises a 90-degree elbow and composite steel straight pipes connected to two ends of the elbow, the elbow penetrates through the structural joint, and the surface of the joint-crossing pipeline sequentially comprises an asphalt hemp sheet, a polyethylene closed-cell foam board and a hemp rope from inside to outside.

Further, the wrapping range of the asphalt hemp sheets and the polyethylene closed-cell foam boards is that the cross joint of the structural seams and the cross-joint pipeline extends towards the surface of the cross-joint pipeline within 3.5m towards two sides.

Further, the surface of the seam-passing pipeline is derusted and coated with epoxy zinc-rich primer.

Further, the asphalt hemp sheet and the polyethylene closed-cell foam board are both two layers.

Further, the thickness of the single layer of the polyethylene closed-cell foam board is 20mm.

Furthermore, the calibers of the elbow and the composite steel straight pipe are more than DN 500.

Furthermore, the tensile strength of the polyethylene closed-cell foam board is more than or equal to 0.15MPa, the compressive strength is more than or equal to 0.15MPa, the tear strength is more than or equal to 4.0N/mm, the elongation is more than or equal to 100%, the compression permanent deformation is less than or equal to 3.0%, and the hardness (C-type durometer) is 40-60 Shore A degrees.

The technical scheme of the utility model, can satisfy the seam needs of crossing of straight tube type, bent cast heavy-calibre direct-burried composite steel pipe simultaneously, extensive applicability is general to directly wrap up flexible material such as pitch flaxen, polyethylene obturator cystosepiment more lightly, economy and convenient construction in seam pipeline surface, have good structural protection nature.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Detailed Description

The present invention will be further described with reference to the accompanying drawings.

Reference is made to the accompanying drawings. The joint-crossing pipeline in the embodiment is embedded in a backfill concrete structure 101 with a structural joint 102, and comprises a 90-degree elbow 6, a first composite steel straight pipe 1 and a second composite steel straight pipe 2 which are respectively welded at two ends of the elbow 6, and the 90-degree elbow 6 penetrates through the structural joint 102. The two sides of the intersection point of the structural seam 102 and the seam passing pipeline extend outwards within the range of 3.5m, and the surface of the seam passing pipeline is wrapped outwards by two layers of asphalt hemp sheets 3, two layers of polyethylene closed-cell foam boards 4 and hemp ropes 5 in sequence. Specifically, the thickness of 4 individual layers of polyethylene closed cell cystosepiment is 20mm, and each physical mechanics index chooses for use: the tensile strength is more than or equal to 0.15MPa, the compressive strength is more than or equal to 0.15MPa, the tear strength is more than or equal to 4.0N/mm, the elongation is more than or equal to 100%, the compression permanent deformation is less than or equal to 3.0%, and the hardness (C-type durometer) is 40-60 Shore A degrees.

The first composite steel straight pipe 1, the second composite steel straight pipe 2 and the 90-degree elbow 6 are all made of stainless steel lined composite steel pipes, and the caliber of the stainless steel lined composite steel pipes is more than DN 500. The surface of the seam-crossing pipeline needs to be derusted and coated with epoxy zinc-rich primer, and the thickness of a paint film is not less than 50 mu m.

The construction method of the embodiment comprises the following steps: when a seam passing pipeline consisting of the first composite steel straight pipe 1, the second composite steel straight pipe 2 and the 90-degree elbow 6 passes through the structural seam 102, the pipeline in the range of 3.5m on two sides of the reference point is subjected to seam passing treatment by taking the intersection point of the structural seam 102 and the seam passing pipeline as the reference. The method comprises the following specific steps: firstly, derusting the surface of the seam-passing pipeline in the range, and coating epoxy zinc-rich primer (the thickness of a paint film is not less than 50 mu m) for corrosion protection; secondly, wrapping two layers of asphalt hemp sheets 3 on the surface of the seam-passing pipeline; and finally, wrapping two layers of polyethylene closed-cell foam plates 4 on the surface of the seam-passing pipeline by using hemp ropes 5. In addition, before the concrete structure 101 is filled around the pipe-through-joint road, the polyethylene closed-cell foam board 4 and the anti-damage measures at the joints thereof need to be made.

It should be noted that the above describes exemplifying embodiments of the invention. However, it should be understood by those skilled in the art that the present invention is not limited to the above-described embodiments, which are only illustrative of the principles of the present invention, and that various changes and modifications may be made without departing from the scope of the present invention, and the changes and modifications are intended to fall within the scope of the present invention as claimed.

Claims

1. A bent pipe type direct-buried large-caliber composite steel pipe joint protection structure comprises a joint pipeline positioned in a backfilled concrete structure, wherein a structural joint is arranged in the backfilled concrete structure; the pipeline is characterized by comprising a 90-degree elbow and a composite steel straight pipe connected to two ends of the elbow, wherein the elbow penetrates through the structural joint, and the surface of the pipeline sequentially comprises an asphalt hemp sheet, a polyethylene closed-cell foam board and a hemp rope from inside to outside.

2. The crack protection structure of the bent-tube type buried large-caliber composite steel pipe according to claim 1, wherein the asphalt flake and the polyethylene closed-cell foam board are wrapped on the crack surface within 3.5m of the intersection point of the structural crack and the crack pipe.

3. The joint-crossing protection structure of the elbow-type direct-buried large-caliber composite steel pipe as claimed in claim 1 or 2, wherein the surface of the joint-crossing pipeline is derusted and coated with epoxy zinc-rich primer.

4. The joint protection structure for the bent-tube type directly-buried large-caliber composite steel pipe as claimed in claim 3, wherein the asphalt flake and the polyethylene closed-cell foam board are formed in two layers.

5. The crack protection structure of the elbow type direct burial large caliber composite steel pipe as claimed in claim 4, wherein the single thickness of the closed-cell foam polyethylene plate is 20mm.

6. The crack protection structure of the elbow type direct-buried large-caliber composite steel pipe according to claim 3, wherein the calibers of the elbow and the composite steel straight pipe are DN500 or more.

7. The crack protection structure of the bent pipe type buried large diameter composite steel pipe according to claim 3, wherein the closed cell foam plate of polyethylene has a tensile strength of 0.15MPa or more, a compressive strength of 0.15MPa or more, a tear strength of 4.0N/mm or more, an elongation of 100% or more, a compression set of 3.0% or less, and a hardness (type C durometer) of 40-60 Shore A.