KR20090026842A - Steel pipe repair and reinforcement work method - Google Patents

Steel pipe repair and reinforcement work method Download PDF

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Publication number
KR20090026842A
KR20090026842A KR1020070091872A KR20070091872A KR20090026842A KR 20090026842 A KR20090026842 A KR 20090026842A KR 1020070091872 A KR1020070091872 A KR 1020070091872A KR 20070091872 A KR20070091872 A KR 20070091872A KR 20090026842 A KR20090026842 A KR 20090026842A
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South Korea
Prior art keywords
steel pipe
protective material
reinforcing
reinforcement
repair
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KR1020070091872A
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Korean (ko)
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이화선
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주식회사 엠티마스타
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Priority to KR1020070091872A priority Critical patent/KR20090026842A/en
Publication of KR20090026842A publication Critical patent/KR20090026842A/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L57/00—Protection of pipes or objects of similar shape against external or internal damage or wear
    • F16L57/02—Protection of pipes or objects of similar shape against external or internal damage or wear against cracking or buckling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
    • F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
    • F16L58/04—Coatings characterised by the materials used
    • F16L58/10—Coatings characterised by the materials used by rubber or plastics
    • F16L58/1054—Coatings characterised by the materials used by rubber or plastics the coating being placed outside the pipe
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
    • F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
    • F16L58/16—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings the coating being in the form of a bandage

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pipe Accessories (AREA)

Abstract

A steel pipe protecting material and a steel pipe repair and reinforcement method using the same are provided to adhere the reinforcing material and foamed polyurethane resin to a cracked site and a part in which the interior part is damaged. A steel pipe reinforcement material(S) comprises a stiffener part formed with T shape in which horizontal and vertical edge intersect; and a reinforcement plate located in the lower part of the reinforcing material, and formed into the long strip shape. A steel pipe repair and reinforcement method comprises: a step of washing a steel pipe(40) using, and is repaired the high pressure washing device; a step of spirally winding the outer circumference of the steel pipe with the protecting material to the state where the injection nozzle(60) is embedded; and a step of integrating the steel pipe and steel pipe protecting material.

Description

강관 보호재 및 이를 이용한 강관 보수보강공법{steel pipe repair and reinforcement work method}Steel pipe protection and steel pipe repair and reinforcement work method using the same

본 발명은 강관 보호재 및 이를 강관 보수보강공법에 관한 것으로, 특히 노후된 강관의 외주면에 강관 보호재 및 발포폴리우레탄수지를 부착 및 충전하여, 노후 강관을 보수보강하는 강관 보호재 및 이를 이용한 강관 보수보강공법에 관한 것이다.The present invention relates to a steel pipe protective material and a steel pipe repair reinforcement method, in particular, by attaching and filling the steel pipe protective material and the foamed polyurethane resin on the outer peripheral surface of the old steel pipe, to the steel pipe protective material for reinforcing reinforcement of the old steel pipe and steel pipe maintenance reinforcement method using the same It is about.

일반적으로 강관은 시공 후 오랜 시간이 지나면 노후화되어 보수 및 보강이 필요한바, 이 강관의 보수 및 보강은 균열부위의 손상 및 심화 정도에 따라 달라지는데, 균열부위가 미세할 경우에는 주입공법으로 대표되는 강관 보수공법을 사용하고, 균열부위가 크거나 구조물이 파손된 경우에는 단면증설공법으로 대표되는 구조물 보강공법을 사용한다.In general, steel pipes are aging after a long time of construction and require repair and reinforcement. The repair and reinforcement of these steel pipes depends on the degree of damage and intensification of the cracked areas. Repair method is used, and in case of large crack or damaged structure, structural reinforcement method, which is represented by section expansion method, is used.

여기서, 상기한 주입공법은 강관 균열보수에 가장 많이 사용되는 방법으로서 강관의 균열 내부에 수지계 또는 유기계의 재료를 인력식, 기계식으로 주입하여 방수성, 내구성을 향상시키는 공법이다.Here, the above injection method is a method that is most frequently used for repairing steel pipe cracks, and is a method of improving water resistance and durability by injecting resin-based or organic materials into the cracks of steel pipes by manpower or mechanically.

그런데 상기한 주입공법은 인력식 주입의 경우에는 균열의 관통부위에 주입 할 수 있으나, 미관통 부분의 균열은 구석까지 재료를 주입하기가 곤란한 문제가 있으며, 기계식 주입은 주입압력이 너무 높으면 오히려 균열부위를 넓혀줄 뿐만 아니라 주입기에 주입재료가 남아서 재료손실이 많은 문제점이 있다.By the way, the above injection method can be injected into the penetrating part of the crack in the case of the attraction injection, but the crack of the non-penetrating part is difficult to inject the material to the corner, mechanical injection is rather cracked if the injection pressure is too high In addition to widening the site, there is a problem of a lot of material loss because the injection material remains in the injector.

또한, 상기한 단면증설공법은 내력 손상된 강관 주요부위의 표면에 강재 등을 부착하여 보강하는 방법으로, 슬래브 하부나 기둥 등에 보나 지지대 등을 증설하는 것으로, 슬래브 하부에 강재봉을 증설시키는 것은 슬래브의 지지거리를 감소시켜 슬래브의 휨 모멘트와 처짐을 감소시키는 방법이고, 기둥에 지지대를 증설하는 것은 기둥의 강성을 증가시켜 지지력을 향상시키는 방법이다.In addition, the cross-sectional expansion method is a method of attaching and reinforcing the steel, etc. to the surface of the main portion of the strength-damaged steel pipe, and by adding a beam or support to the lower slab, column, etc., the expansion of the steel rod in the lower slab is the support of the slab It is a method of reducing the bending moment and deflection of the slab by reducing the distance, and adding a support to the column is a method of increasing the rigidity of the column to improve the bearing capacity.

그런데 상기한 단면증설공법은 비교적 공정이 단순하고 경제적이나 기존보와 증설보의 접합부나 슬래브나 증설보 및 기존 기둥과 증설기둥과의 접합부 처리가 어려운 단점이 있다.However, the above-described cross-section extension method is relatively simple and economical, but there is a disadvantage in that it is difficult to process the joint between the existing beam and the extension beam, the slab or the extension beam, and the connection between the existing column and the extension column.

이에, 본 발명은 상기한 바와 같은 제문제점을 해결하기 위해 안출된 것으로서, 강관의 균열부위 및 내력이 손상된 부분을 보강재 및 발포폴리우레탄수지를 부착 및 충전하여 강관을 용이하게 보수 및 보강하도록 한 강관 보호재 및 이를 이용한 강관 보수보강공법을 제공하는데 그 목적이 있다.Therefore, the present invention was devised to solve the problems described above, the steel pipe to easily repair and reinforce the steel pipe by attaching and filling the reinforcing material and foamed polyurethane resin in the cracked portion and the strength of the steel pipe damaged The purpose is to provide a protective material and steel pipe repair reinforcement method using the same.

상기한 목적을 달성하기 위한 본 발명에 따른 강관 보호재는 전체적으로 수평과 수직이 교차하는 T형 형상으로 이루어지는 보강재와; 상기 보강재의 하부에 위치되며 일체로 이루어지며, 가늘고 긴띠 형상으로 이루어진 보강판으로 구성됨을 특징으로 한다.Steel pipe protective material according to the present invention for achieving the above object is a reinforcing member made of a T-shape crosses the horizontal and vertical as a whole; Located in the lower portion of the reinforcing material is made integrally, characterized in that consisting of a reinforcing plate made of a thin and long strip shape.

또한, 상기한 목적을 달성하기 위한 본 발명에 따른 강관 보호재를 이용한 강관 보수보강공법은 보수 및 보강할 강관을 고압 세척장비를 이용하여 세척하는 단계; 상기 강관의 외주면에 연속적으로 강관 보호재를 제관기로 제작하면서 강관의 외주면을 주입관이 매설된 상태로 나선형으로 감는 단계; 상기 주입관을 통해 폴리우레탄수지를 충전시킴과 동시에 발포시켜 강관과 강관 보호재를 일체화시키는 단계로 이루어짐을 특징으로 한다. In addition, the steel pipe maintenance reinforcing method using a steel pipe protective material according to the present invention for achieving the above object comprises the steps of washing and repairing the steel pipe to be repaired and reinforced using a high pressure washing equipment; Spirally winding the outer circumferential surface of the steel pipe while the injection pipe is embedded while continuously manufacturing a steel pipe protecting member on the outer circumferential surface of the steel pipe; Filling the polyurethane resin through the injection pipe and foaming at the same time characterized in that the step consisting of the steel pipe and the steel pipe protective material.

이상에서 설명한 바와 같이, 본 발명에 따른 강관 보호재 및 강관 보수보강공법은 강관의 균열부위 및 내력이 손상된 부분을 보강재 및 발포폴리우레탄수지를 부착 및 충전하여 노후 강관을 용이하게 보수 및 보강하는 이점이 있다.As described above, the steel pipe protective material and steel pipe repair reinforcement method according to the present invention has the advantage of easily repairing and reinforcing old steel pipe by attaching and filling the reinforcing material and foamed polyurethane resin in the cracked portion and the strength of the steel pipe damaged have.

이하, 본 발명을 첨부한 예시도면을 참조하여 상세히 설명한다.Hereinafter, with reference to the accompanying drawings, the present invention will be described in detail.

도 1은 본 발명에 따른 강관 보호재를 도시한 단면도이다.1 is a cross-sectional view showing a steel pipe protective material according to the present invention.

이 도면에 도시된 바와 같이, 본 발명에 따른 강관 보호재는 전체적으로 수평과 수직이 교차하는 T형 형상으로 이루어지는 보강재(10)와; 상기 보강재(10)의 하부에 위치되며 일체로 이루어지며, 가늘고 긴띠 형상으로 이루어진 보강판(20)으로 구성된다.As shown in this figure, the steel pipe protective material according to the present invention includes a reinforcing member (10) made of a T-shape crossover horizontally and vertically as a whole; Located in the lower portion of the reinforcing material 10 is made of an integral, consists of a reinforcing plate 20 made of a thin and long strip shape.

즉, 본 발명에 따른 강관 보호재(S)는 보강재(10)와 보강판(20)이 유기적으 로 결합되어 이루어진 구조이다.That is, the steel pipe protective material (S) according to the present invention is a structure consisting of the reinforcing material 10 and the reinforcing plate 20 is organically combined.

여기서, 상기 보강재(10)는 전체적으로 수평과 수직이 교차하는 T형 형상으로 이루어진 구조이다.Here, the reinforcing material 10 is a structure made of a T-shaped crossover horizontally and vertically as a whole.

또한, 상기 보강판(20)은 가늘고 긴띠 형상으로 이루어지며, 그 재질은 경질비닐로 구성된다.In addition, the reinforcing plate 20 is made of a thin and long strip shape, the material is made of hard vinyl.

이하, 상기한 바와 같은 구성으로 이루어진 본 발명에 따른 강관 보호재를 이용한 강관 보수보강에 대해 설명한다.Hereinafter, a steel pipe repair reinforcement using the steel pipe protective material according to the present invention having the configuration as described above.

도 2(a) 내지 도 2(c)는 본 발명에 따른 강관 보호재를 이용하여 강관을 보수 및 보강하는 과정을 도시한 예시도이다.2 (a) to 2 (c) is an exemplary view showing a process of repairing and reinforcing steel pipes using the steel pipe protective material according to the present invention.

이들 도면에 도시된 바와 같이, 본 발명에 따른 강관 보호재를 이용한 강관 보수보강공법은 보수 및 보강할 강관(40)을 고압 세척장비를 이용하여 세척하는 단계; 상기 강관(40)의 외주면에 연속적으로 강관 보호재(S)를 제관기(50)로 제작하면서 강관(40)의 외주면을 주입관(60)이 매설된 상태로 나선형으로 감는 단계; 상기 주입관(60)을 통해 폴리우레탄수지(70)를 충전시킴과 동시에 발포시켜 강관(40)과 강관 보호재(S)를 일체화시키는 단계로 이루어진다.As shown in these drawings, the steel pipe repair reinforcement method using a steel pipe protective material according to the present invention comprises the steps of washing and repairing the steel pipe 40 to be repaired and reinforced using a high pressure washing equipment; Spirally winding the outer circumferential surface of the steel pipe 40 in a state in which the injection pipe 60 is embedded while continuously manufacturing the steel pipe protective material S on the outer circumferential surface of the steel pipe 40; Filling the polyurethane resin 70 through the injection pipe 60 and foaming at the same time is made to integrate the steel pipe 40 and the steel pipe protective material (S).

즉, 본 발명에 따른 강관 보호재를 이용한 강관 보수보강공법은 노후 강관(60)의 외주면을 강관 보호재(S)를 권취한 상태에서 상기 강관(60)의 외주면과 강관 보호재(S) 내주면 간에 폴리우레탄수지(70)를 충전시킨 후, 상기 폴리우레탄수지(70)를 발포시켜 강관(40)과 강관 보호재(S)를 일체화시켜 강관(40)을 보수보강함을 기술적 사상의 특징으로 한다.That is, the steel pipe repair reinforcing method using the steel pipe protective material according to the present invention is a polyurethane between the outer peripheral surface of the steel pipe 60 and the inner peripheral surface of the steel pipe protective material (S) in the state in which the steel pipe protective material (S) is wound around the outer peripheral surface of the aging steel pipe (60) After filling the resin 70, the polyurethane resin 70 is foamed to integrate the steel pipe 40 and the steel pipe protective material (S) to reinforce the steel pipe 40 is characterized by technical features.

여기서, 상기 강관 보호재(S)는 전체적으로 수평과 수직이 교차하는 T형 형상으로 이루어진 보강재(10)와; 상기 보강재(10)의 하부에 위치되며 일체로 이루어지며, 가늘고 긴띠 형상으로 이루어지며, 경질염화비닐로 구성되는 보강판(20)으로 이루어진다.Here, the steel pipe protective material (S) and the reinforcing member (10) made of a T-shaped crossover horizontally and vertically as a whole; Located in the lower portion of the reinforcing material 10 is made integrally, made of a thin, long strip shape, made of a reinforcing plate 20 made of hard vinyl chloride.

한편, 상기 주입관(60)에 폴리우레탄수지(70)를 충전시 강관(40)에 주입관(60)을 매설하고, 상기 주입관(60)의 아래에서 위쪽으로 폴리우레탄수지(70)을 상향으로 주입하면서 강관(40)과 강관 보호재(S) 사이를 충전한다.On the other hand, when filling the polyurethane resin 70 in the injection pipe 60, the injection pipe 60 is embedded in the steel pipe 40, and the polyurethane resin 70 upward from below the injection pipe 60 Filling between the steel pipe 40 and the steel pipe protective material (S) while injecting upward.

여기서, 상기 폴리우레탄수지(70)는 알코올기와 이소시안산기의 결합으로 만들어진 우레탄결합으로 결합된 고분자 화합물의 총칭으로, 폴리우레탄에 기포가 들어 있는 우레탄폼이 쓰인다. Here, the polyurethane resin 70 is a generic name of a polymer compound bonded by a urethane bond made of a combination of an alcohol group and an isocyanic acid group, and a urethane foam containing bubbles in the polyurethane is used.

특히, 우레탄계 합성고무에는 폴리에스테르계와 폴리에테르계가 있다. 폴리에스테르계는 프로필렌글리콜과 에틸렌글리콜을 아디프산과 반응시켜 폴리에스테르로 만들고, 양단에 OH기를 가진 분자량 3,000까지의 것을 나프탈렌-1, 5-디이소시안산으로 우레탄화 시킴과 동시에 고분자로 만든 것이다.  In particular, urethane-based synthetic rubbers include polyesters and polyethers. The polyester system is made of polyester by reacting propylene glycol and ethylene glycol with adipic acid, and having a molecular weight of 3,000 having OH groups at both ends is urethaneized with naphthalene-1 and 5-diisocyanic acid and made of polymer.

또 폴리에테르계는 산화프로필렌에 얼마간의 산화에틸렌을 섞어서 먼저 폴리에테르로 하고, 그 양끝의 OH기를 톨루일렌디이소시안산과 반응시켜 고분자량의 폴리우레탄으로 만든 것이다. 내오존성·내마모성이 좋은 합성고무가 되며, 폴리에테르계 폴리우레탄에 기포가 들어 있는 우레탄폼이 이용된다. In addition, the polyether is mixed with ethylene oxide with some ethylene oxide first to be a polyether, and the OH groups at both ends are reacted with toluylene diisocyanic acid to make a high molecular weight polyurethane. It becomes a synthetic rubber with good ozone resistance and abrasion resistance, and urethane foam containing air bubbles in polyether polyurethane is used.

따라서, 상기 폴리우레탄수지(70)를 주입관(60)을 통해 주입시키면, 폴리우레탄수지(70)와 물이 반응하여 폴리우레탄수지(70)가 발포되어 우레탄폼이 되어 강 관(40)의 외주면과 보강재(S)의 내주면간을 긴밀하게 충전시키는 작용효과가 있다.Therefore, when the polyurethane resin 70 is injected through the injection pipe 60, the polyurethane resin 70 and water reacts and the polyurethane resin 70 is foamed to form a urethane foam of the steel pipe 40 There is an effect of closely filling the outer peripheral surface and the inner peripheral surface of the reinforcing material (S).

도 1은 본 발명에 따른 강관 보호재를 도시한 단면도,1 is a cross-sectional view showing a steel pipe protective material according to the present invention,

도 2(a) 내지 도 2(c)는 본 발명에 따른 강관 보호재를 이용하여 강관을 보수 및 보강하는 과정을 도시한 예시도.2 (a) to 2 (c) is an exemplary view showing a process of repairing and reinforcing steel pipes using the steel pipe protective material according to the present invention.

-도면의 주요부분에 대한 부호의 설명-Explanation of symbols on the main parts of the drawing

10: 보강재 20: 보강판10: reinforcing material 20: reinforcing plate

40: 강관 50: 제관기40: steel pipe 50: tube making machine

60: 주입관 70: 폴리우레탄수지60: injection tube 70: polyurethane resin

S: 강관 보호재S: steel pipe protective material

Claims (5)

전체적으로 수평과 수직이 교차하는 T형 형상으로 이루어지는 보강재(10)와; 상기 보강재(10)의 하부에 위치되며 일체로 이루어지며, 가늘고 긴띠 형상으로 이루어진 보강판(20)으로 구성됨을 특징으로 하는 강관 보호재.A reinforcing member 10 having a T-shape in which horizontal and vertical crosses the whole; Located in the lower portion of the reinforcing material (10) is made of an integral, steel pipe protective material, characterized in that consisting of a reinforcing plate 20 made of a thin and long strip shape. 제 1항에 있어서,The method of claim 1, 상기 보강판(20)은 경질염화비닐로 구성됨을 특징으로 하는 강관 보호재.The reinforcing plate 20 is a steel pipe protective material, characterized in that composed of hard vinyl chloride. 보수 및 보강할 강관(40)을 고압 세척장비를 이용하여 세척하는 단계; Cleaning and reinforcing the steel pipe 40 using a high pressure washing equipment; 상기 강관(40)의 외주면에 연속적으로 강관 보호재(S)를 제관기(50)로 제작하면서 강관(40)의 외주면을 주입관(60)이 매설된 상태로 나선형으로 감는 단계; 상기 주입관(60)을 통해 폴리우레탄수지(70)를 충전시킴과 동시에 발포시켜 강관(40)과 강관 보호재(S)를 일체화시키는 단계로 이루어짐을 특징으로 하는 강관 보호재를 이용한 강관 보수보강공법. Spirally winding the outer circumferential surface of the steel pipe 40 in a state in which the injection pipe 60 is embedded while continuously manufacturing the steel pipe protective material S on the outer circumferential surface of the steel pipe 40; Steel pipe repair and reinforcement method using a steel pipe protective material, characterized in that the filling of the polyurethane resin 70 through the injection pipe 60 and foaming at the same time to integrate the steel pipe 40 and the steel pipe protective material (S). 제 3항에 있어서, The method of claim 3, wherein 상기 구조물 보강재(S)는 전체적으로 수평과 수직이 교차하는 T형 형상으로 이루어지는 보강재(10)와; 상기 보강재(10)의 하부에 위치되며 일체로 이루어지며, 가늘고 긴띠 형상으로 이루어진 보강판(20)으로 구성됨을 특징으로 하는 강관 보호 재를 이용한 강관 보수보강공법. The structure reinforcement (S) is a reinforcement (10) made of a T-shape crosses the horizontal and vertical as a whole; Located in the lower portion of the reinforcing material (10) is made integrally, steel pipe repair reinforcement method using a steel pipe protective material, characterized in that consisting of a reinforcing plate 20 made of a thin and long strip. 제 4항에 있어서,The method of claim 4, wherein 상기 보강판(20)은 경질염화비닐로 이루어짐을 특징으로 하는 강관 보호재를 이용한 강관 보수보강공법.The reinforcing plate 20 is a steel pipe repair reinforcement method using a steel pipe protective material, characterized in that made of hard vinyl chloride.
KR1020070091872A 2007-09-11 2007-09-11 Steel pipe repair and reinforcement work method KR20090026842A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111795215A (en) * 2020-07-08 2020-10-20 庞金超 Supporting structure is filled in water conservancy pipeline construction

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KR100325703B1 (en) * 1998-12-30 2002-05-09 박종섭 Method of forming a capacitor for a semiconductor device
KR100441497B1 (en) * 2002-01-22 2004-07-23 김광수 Ceramic coated insulation pipe in inner surface
KR100652935B1 (en) * 2005-04-22 2006-12-01 아이케이스틸 주식회사 adiabatic pipe
KR100699722B1 (en) * 2006-04-25 2007-03-28 주식회사 엠티마스타 The concrete structure and steel pipe repair reinforcement method of construction using structure reinforcement material and this

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100325703B1 (en) * 1998-12-30 2002-05-09 박종섭 Method of forming a capacitor for a semiconductor device
KR100441497B1 (en) * 2002-01-22 2004-07-23 김광수 Ceramic coated insulation pipe in inner surface
KR100652935B1 (en) * 2005-04-22 2006-12-01 아이케이스틸 주식회사 adiabatic pipe
KR100699722B1 (en) * 2006-04-25 2007-03-28 주식회사 엠티마스타 The concrete structure and steel pipe repair reinforcement method of construction using structure reinforcement material and this

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111795215A (en) * 2020-07-08 2020-10-20 庞金超 Supporting structure is filled in water conservancy pipeline construction

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