A double-plate concrete composite pipeline with welded spacer square steel pipes and its construction method

Abstract

This invention discloses a double-steel-plate concrete composite pipeline with welded spaced square steel pipes and its construction method. The composite pipeline is assembled from several double-steel-plate concrete composite pipe segments along the circumferential direction, prefabricated in sections along the length direction, and adjacent pipes are welded together. Each composite pipe segment includes an arc-shaped outer steel plate, an arc-shaped inner steel plate, side plates at the ends of the arc-shaped outer and inner steel plates, square steel pipes between the arc-shaped outer and inner steel plates, perforated ribs between adjacent square steel pipes, and interlayer concrete filling the spaces between adjacent square steel pipes. This invention employs a double-steel-plate concrete composite structure, which has advantages such as high overall strength, good stability, and good economy. The square steel pipes connecting the inner and outer steel plates improve the overall rigidity of the pipeline and prevent local buckling of the steel plates. The welded perforated ribs between adjacent square steel pipes improve the synergistic working ability between the steel pipes and the interlayer concrete. The hollow interior of the steel pipes reduces the pipeline's self-weight and improves the transportation efficiency of the pipe segments, showing broad prospects for engineering applications.

Description

Technical Field

[0001] This invention belongs to the technical field of pressure pipelines for pumped storage power stations, and specifically relates to a double-steel plate concrete composite pipeline with welded spacer square steel pipes and its construction method. Background Technology

[0002] As a crucial component of pumped-storage power plants, pressure pipelines ensure the safe and stable operation of the plant's pumped-storage and power generation processes. With the inevitable trend towards large-scale and megawatt-class pumped-storage power plants, the safety of pressure pipelines is becoming increasingly important.

[0003] Traditional pressure pipelines primarily use steel pipes, which offer advantages such as convenient installation and short construction periods. However, steel pipes are thin-walled structures, making them susceptible to yield strength failure and structural instability leading to buckling failure under external pressure. Furthermore, steel pipes are expensive and heavy, significantly increasing construction and transportation costs, making it difficult to meet the development requirements of large-megawatt pumped storage power stations. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the present invention aims to provide a double steel plate concrete composite pipeline with welded spaced square steel pipes and a construction method thereof, in order to improve the overall strength and stability of the pipeline, reduce costs, and improve construction efficiency.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A double-steel-plate concrete composite pipeline with welded spacer square steel pipes is composed of several prefabricated pipe sections welded sequentially along its length. Each prefabricated pipe section is formed by splicing several double-steel-plate concrete composite pipe segments circumferentially. Each double-steel-plate concrete composite pipe segment includes:

[0007] Curved outer steel plate;

[0008] Curved inner steel plate;

[0009] A side plate connecting the axial ends of the outer arc-shaped steel plate and the inner arc-shaped steel plate;

[0010] Multiple square steel pipes are arranged circumferentially between the outer arc-shaped steel plate and the inner arc-shaped steel plate;

[0011] Perforated ribs connecting adjacent square steel pipes

[0012] And, the interlayer of concrete filled between the adjacent square steel pipes.

[0013] In one embodiment, the square steel pipe is welded from two rolled steel plates and two arc-shaped steel plates. The top surface of the square steel pipe is welded to the outer arc-shaped steel plate, and the bottom surface is welded to the inner arc-shaped steel plate. The square steel pipes are arranged at equal intervals along the length of the pipeline.

[0014] In one embodiment, the two ends of the perforated rib are respectively welded to the outer side wall of the adjacent square steel pipe and are arranged along the length of the pipe.

[0015] In one embodiment, a smooth circular hole is provided at the center of the perforated rib, and the smooth circular holes are arranged at equal intervals along the circumferential direction of the pipe.

[0016] In one embodiment, the curvature of the outer arc-shaped steel plate and the inner arc-shaped steel plate are both the same as the curvature of the perforated rib.

[0017] In one embodiment, shear studs are provided on both the inner side of the arc-shaped outer steel plate and the outer side of the arc-shaped inner steel plate. The shear studs are arranged at equal intervals along the circumferential direction of the pipeline and alternate with the square steel pipes along the length of the pipeline.

[0018] In one embodiment, the interlayer concrete is poured either precast or cast in place, and the interlayer concrete is high-strength concrete, self-compacting concrete, fiber-reinforced concrete (FRC), reactive powder concrete (RPC), or ultra-high performance concrete (UHPC).

[0019] In one embodiment, the splicing of the double-steel plate concrete composite pipe segment involves welding the circumferential ends of the arc-shaped outer steel plate, the circumferential ends of the arc-shaped inner steel plate, the ends of the square steel pipe, and the perforated ribs of adjacent double-steel plate concrete composite pipe segments respectively.

[0020] The present invention also provides a construction method for the double-steel-plate concrete composite pipeline with welded spacer square steel pipes, comprising:

[0021] 1) In the factory, the inner arc-shaped steel plate and the outer arc-shaped steel plate are processed. The bottom surface of the square steel pipe is welded to the outside of the inner arc-shaped steel plate. The perforated rib plate is welded between adjacent square steel pipes. The outer arc-shaped steel plate is welded to the top surface of the square steel pipe. A side plate is welded to one axial end of the inner arc-shaped steel plate and one axial end of the outer arc-shaped steel plate.

[0022] 2) At the factory or on site, pour interlayer concrete between adjacent square steel pipes, and weld a side plate to the other axial end of the inner arc-shaped steel plate and the other axial end of the outer arc-shaped steel plate to complete the processing of double steel plate concrete composite pipe segments.

[0023] 3) On site, double steel plate concrete composite pipe segments are welded along the circumferential direction to form a precast pipe section. The above splicing operation is repeated to obtain several precast pipe sections. Adjacent precast pipe sections are welded along the length direction to obtain a double steel plate concrete composite pipeline.

[0024] In one embodiment, 1) before welding the perforated rib, equally spaced smooth round holes are made at the center position of the perforated rib, and before welding the square steel pipe, shear studs are welded on the outer side of the inner arc-shaped steel plate and the inner side of the outer arc-shaped steel plate.

[0025] Compared with the prior art, the beneficial effects of the present invention are:

[0026] 1) Convenient construction

[0027] The double-plate concrete composite pipe system with welded square steel pipes is prefabricated in sections along the circumferential direction and along the length direction. The composite pipe sections are welded on-site, ensuring reliable connections. The inner and outer steel plates and steel pipes serve as formwork for pouring concrete, eliminating the need for formwork erection and dismantling. This simple structure facilitates construction, shortens the construction cycle, and improves construction efficiency.

[0028] 2) Performance improvement

[0029] The double-steel-plate concrete composite pipeline with welded square steel pipes fully utilizes the characteristics of the composite structure, and has advantages such as high overall strength and good stability. The square steel pipes connect the inner and outer steel plates, which improves the overall rigidity of the pipeline and prevents local buckling of the steel plates. Perforated ribs are welded to adjacent square steel pipes to improve the synergistic working ability between the steel pipes and the sandwich concrete.

[0030] 3) Low cost

[0031] The welded spaced square steel pipe double steel plate concrete composite pipeline fully utilizes the strength and stability of steel and concrete, saves steel consumption, and the hollow interior of the steel pipe reduces the pipeline's weight, improves the transportation efficiency of the pipe segments, reduces project costs, and has good economic benefits.

[0032] Overall, the double-plate concrete composite pipeline with welded square steel pipes fully leverages the characteristics of the composite structure, offering advantages such as high overall strength, good stability, and economic efficiency. The square steel pipes connect the inner and outer steel plates, preventing local buckling of the steel plates. Welded perforated ribs between adjacent square steel pipes enhance the synergistic working ability between the steel pipes and the sandwich concrete. The hollow interior of the steel pipes reduces the pipeline's self-weight, improving the transportation efficiency of the pipe segments. This solves key problems such as poor stability and heavy self-weight of traditional pressure steel pipes, making it widely applicable in the field of pressure pipelines for pumped storage power stations, and possessing significant engineering practical significance and socio-economic benefits. Attached Figure Description

[0033] Figure 1 This is an overall schematic diagram of the double-steel-plate concrete composite pipeline with welded spacer square steel pipes of the present invention.

[0034] Figure 2 This is an overall schematic diagram of the double-steel-plate concrete composite pipe segment of the welded spacer square steel pipe of the present invention.

[0035] Figure 3This is a cross-sectional schematic diagram of the double-steel plate concrete composite pipe segment of the welded spacer square steel pipe of the present invention.

[0036] Figure 4 yes Figure 3 A cross-sectional schematic diagram of AA.

[0037] Figure 5 yes Figure 3 A cross-sectional view of BB.

[0038] Figure 6 This is an overall schematic diagram of the perforated rib plate in this invention.

[0039] Icons: 1-Combined segment; 2-Curved outer steel plate; 3-Curved inner steel plate; 4-Side plate; 5-Square steel pipe; 6-Perforated rib plate; 7-Layered concrete; 8-Smooth round hole; 9-Shear stud; 10-Welding. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0041] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0042] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0043] In the description of this application, it should be noted that the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product is usually placed during use. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0044] As mentioned earlier, traditional pressure pipelines mostly use steel pipes, which are prone to yield strength failure or buckling failure under long-term pressure environment, making them difficult to meet the requirements of large-megawatt pumped storage power stations.

[0045] Based on this, the present invention provides a double-steel-plate concrete composite pipe with welded spaced square steel pipes, such as... Figure 1 As shown, it is composed of several prefabricated pipe sections welded sequentially along the length direction. Each prefabricated pipe section is formed by splicing several double steel plate concrete composite pipe segments 1 in the circumferential direction. Figure 1 The embodiment shows four prefabricated pipe segments, each of which is composed of four double-steel plate concrete composite pipe segments 1 spliced ​​together. Figure 1 The welding section 10 is also shown. Obviously, it is easy to understand that the "several" double steel plate concrete composite pipe segments 1 of the present invention refers to the fact that the number of double steel plate concrete composite pipe segments 1 in a single prefabricated pipe section is at least 2, otherwise it is not enough to "splice".

[0046] Double steel plate concrete composite tunnel segment 1 is the basic component of this invention, see reference. Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, each double-steel-plate concrete composite segment 1 mainly includes an arc-shaped outer steel plate 2, an arc-shaped inner steel plate 3, two side plates 4, multiple square steel pipes 5, several perforated ribs 6, and a layer of interlayer concrete 7. One side plate 4 is welded to one axial end of the arc-shaped outer steel plate 2 and one axial end of the arc-shaped inner steel plate 3, and the other side plate 4 is welded to the other axial end of the arc-shaped outer steel plate 2 and the other axial end of the arc-shaped inner steel plate 3. Thus, the arc-shaped outer steel plate 2, the arc-shaped inner steel plate 3, and the two side plates 4 constitute an arc-shaped cavity, which is closed at both axial ends and open at both circumferential ends.

[0047] Multiple square steel pipes 5 are arranged circumferentially, i.e., around the outer arc-shaped steel plate 2 and the inner arc-shaped steel plate 3. Perforated ribs 6 connect adjacent square steel pipes 5. In this invention, "multiple square steel pipes 5" refers to a double-plate concrete composite segment 1 in which the number of square steel pipes 5 is not less than two. In this invention, "several perforated ribs 6" refers to a double-plate concrete composite segment 1 in which the number of perforated ribs 6 is one less than the number of square steel pipes 5. Interlayer concrete 7 fills the spaces between adjacent square steel pipes 5.

[0048] In the structure of this invention, the use of a double-steel-plate concrete composite structure provides advantages such as high overall strength, good stability, and good economy. The square steel pipe 5 connects the arc-shaped outer steel plate 2 and the arc-shaped inner steel plate 3, which improves the overall rigidity of the pipeline and prevents local buckling of the steel plates. The welded perforated ribs 6 between adjacent square steel pipes 5 enhance the collaborative working ability between the square steel pipes 5 and the sandwiched concrete 7. The hollow internal structure of the square steel pipe 5 reduces the pipeline's self-weight and improves the efficiency of segment transportation.

[0049] In an embodiment of the present invention, the square steel pipe 5 can be welded from two rolled steel plates and two arc-shaped steel plates, wherein the top surface of the square steel pipe 5 is welded to the outer arc-shaped steel plate 2, and the bottom surface is welded to the inner arc-shaped steel plate 3, and the square steel pipes 5 are preferably arranged at equal intervals along the length of the pipe.

[0050] This embodiment provides the specific composition of the square steel tube 5. Its process and structure allow for convenient prefabrication in a factory. The outer top surface of the square steel tube 5 is welded to the inner wall of the arc-shaped outer steel plate 2, and the outer bottom surface of the square steel tube 5 is welded to the outer wall of the arc-shaped inner steel plate 3, thus forming an integral structure. The presence of the square steel tube 5 can greatly improve the overall rigidity of the structure. At the same time, since the square steel tube 5 is a hollow structure, it can also greatly reduce the self-weight of the components. The number and spacing of the square steel tubes 5 can be calculated and set as needed. In a double-steel plate concrete composite pipe segment 1, the outer sides of the two square steel tubes 5 at their axial ends can be attached to the outer side of the side plate 4, or they can be spaced apart.

[0051] In this invention, the inner side of the arc-shaped outer steel plate 2 refers to its inner arc surface, and the outer side refers to its outer arc surface. Similarly, the inner side of the arc-shaped inner steel plate 3 refers to its inner arc surface, and the outer side refers to its outer arc surface.

[0052] In an embodiment of the present invention, the side plate 4 can be directly replaced by one side of the square steel tube 5, which can save some of the processes related to the side plate 4.

[0053] In an embodiment of the present invention, the two ends of the perforated rib plate 6 are respectively welded to the outer side wall of the adjacent square steel pipe 5, and are arranged along the length of the pipe. A smooth circular hole 8 is provided at the center of the perforated rib plate 6, and the smooth circular holes 8 are arranged at equal intervals along the circumferential direction of the pipe, such as... Figure 6 As shown. The width of the perforated rib plate 6 is determined based on the pre-set spacing of the square steel tubes 5.

[0054] In this embodiment, the perforated rib plate 6 improves the bonding force between adjacent square steel pipes 5 on the one hand, and on the other hand, due to its perforated structure, it can also improve the cooperative working ability between adjacent square steel pipes 5 and the interlayer concrete 7 poured between them.

[0055] It is easy to understand that, for the sake of processing convenience and force rules, in this invention, the curvature of the outer arc steel plate 2 and the curvature of the inner arc steel plate 3 are the same as the curvature of the perforated rib plate 6.

[0056] In an embodiment of the present invention, shear studs 9 are provided on the inner side of the arc-shaped outer steel plate 2, and shear studs 9 are also provided on the outer side of the arc-shaped inner steel plate 3. The shear studs 9 on the arc-shaped outer steel plate 2 can be arranged opposite to the shear studs 9 on the arc-shaped inner steel plate 3. Overall, the shear studs 9 are arranged at equal intervals along the circumferential direction of the pipe, and are arranged alternately with the square steel pipes 5 along the length direction of the pipe. The length of the shear studs 9 is determined according to the pre-set position of the perforated rib plate 6.

[0057] In this embodiment, the shear stud 9 can improve the overall strength of the pipeline structure.

[0058] In embodiments of the present invention, the interlayer concrete 7 can be cast in precast or cast-in-place, and can be high-strength concrete, self-compacting concrete, fiber-reinforced concrete (FRC), reactive powder concrete (RPC), or ultra-high performance concrete (UHPC).

[0059] In this embodiment, when prefabrication is used, its advantage lies in improving on-site construction efficiency, but transportation costs will increase. Conversely, when cast-in-place is used, its advantage is that transportation costs can be significantly reduced, but on-site construction efficiency will also decrease. Therefore, in actual projects, the specific casting method can be selected based on factors such as factory location, construction period requirements, and overall cost to improve pipeline transportation efficiency. The materials of the sandwich concrete 7 are diverse and can be selected according to design parameters and costs to meet the different performance requirements of concrete in actual projects.

[0060] In embodiments of the present invention, the splicing of the double-steel-plate concrete composite pipe segment 1 involves welding corresponding parts of adjacent double-steel-plate concrete composite pipe segments 1. Specifically, the circumferential end of the arc-shaped outer steel plate 2 of one double-steel-plate concrete composite pipe segment 1 is welded to the circumferential end of the arc-shaped outer steel plate 2 of another double-steel-plate concrete composite pipe segment 1; the circumferential end of the arc-shaped inner steel plate 3 of one double-steel-plate concrete composite pipe segment 1 is welded to the circumferential end of the arc-shaped inner steel plate 3 of another double-steel-plate concrete composite pipe segment 1; the end of the square steel pipe 5 of one double-steel-plate concrete composite pipe segment 1 is welded to the end of the square steel pipe 5 of another double-steel-plate concrete composite pipe segment 1; and the end of the perforated rib plate 6 of one double-steel-plate concrete composite pipe segment 1 is welded to the end of the perforated rib plate 6 of another double-steel-plate concrete composite pipe segment 1. In some cases, only the arc-shaped outer steel plate 2 and the arc-shaped inner steel plate 3 may be welded.

[0061] In this embodiment, each double steel plate concrete composite pipe segment 1 is spliced ​​into a complete prefabricated pipe section by welding, realizing segmented prefabrication along the length direction.

[0062] The specific construction method of this invention is as follows:

[0063] 1. In the factory, equally spaced round holes 8 are made at the center of the perforated rib plate 6. Shear studs 9 are welded to the outer wall of the arc-shaped inner steel plate 3 and the inner wall of the arc-shaped outer steel plate 2. Square steel pipes 5 are welded to the outer side of the arc-shaped inner steel plate 3. Perforated rib plates 6 are welded between adjacent square steel pipes 5. Arc-shaped outer steel plate 2 is welded to the other side of the square steel pipe 5 by splicing or plug welding. Side plates 4 are welded to one end of the arc-shaped inner steel plate 3 and the arc-shaped outer steel plate 2.

[0064] 2. At the factory or on site, pour interlayer concrete 7 between adjacent square steel pipes 5, and weld side plates 4 at the other end of the inner arc-shaped steel plate 3 and the outer arc-shaped steel plate 2 to complete the processing of the double steel plate concrete composite pipe segment 1.

[0065] 3. On site, weld adjacent composite pipe segments 1 to form a double steel plate concrete composite pipe section. Repeat the above splicing operation to obtain several double steel plate concrete composite pipe sections. After the adjacent pipe sections are welded together, a double steel plate concrete composite pipeline is obtained.

[0066] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A double-plate concrete composite pipeline with welded spaced square steel pipes, characterized in that, It is composed of several prefabricated pipe sections welded sequentially along the length direction, and each prefabricated pipe section is composed of several double steel plate concrete composite segments (1) spliced ​​together in the circumferential direction; each double steel plate concrete composite segment (1) includes: Arc-shaped outer steel plate (2); Arc-shaped inner steel plate (3); Side plate (4) connecting the axial ends of the outer arc-shaped steel plate (2) and the inner arc-shaped steel plate (3); Multiple square steel pipes (5) are arranged circumferentially between the outer arc-shaped steel plate (2) and the inner arc-shaped steel plate (3); Perforated ribs (6) are connected between adjacent square steel pipes (5). And, the interlayer concrete (7) filled between the adjacent square steel pipes (5); The square steel pipe (5) is welded from two rolled steel plates and two arc-shaped steel plates. The top surface of the square steel pipe (5) is welded to the outer arc-shaped steel plate (2), and the bottom surface is welded to the inner arc-shaped steel plate (3). The square steel pipes (5) are arranged at equal intervals along the length of the pipe. The two ends of the perforated rib (6) are respectively welded to the outer side wall of the adjacent square steel pipe (5) and are arranged along the length of the pipe. The splicing of the double steel plate concrete composite pipe segment (1) involves welding the circumferential ends of the arc-shaped outer steel plate (2), the circumferential ends of the arc-shaped inner steel plate (3), the ends of the square steel pipe (5), and the perforated rib plate (6) of the adjacent double steel plate concrete composite pipe segment (1) respectively.

2. The double-steel-plate concrete composite pipeline with welded spacer square steel pipes according to claim 1, characterized in that, The perforated rib (6) has a smooth circular hole (8) at its center, and the smooth circular holes (8) are arranged at equal intervals along the circumferential direction of the pipe.

3. The double-steel-plate concrete composite pipeline with welded spacer square steel pipes according to claim 1, characterized in that, The curvature of the outer arc-shaped steel plate (2) and the inner arc-shaped steel plate (3) are the same as the curvature of the perforated rib plate (6).

4. The double-steel-plate concrete composite pipeline with welded spacer square steel pipes according to claim 1, characterized in that, Shear studs (9) are provided on the inner side of the arc-shaped outer steel plate (2) and the outer side of the arc-shaped inner steel plate (3). The shear studs (9) are arranged at equal intervals along the circumferential direction of the pipeline and are arranged alternately with the square steel pipe (5) along the length direction of the pipeline.

5. The double-steel-plate concrete composite pipeline with welded spacer square steel pipes according to claim 4, characterized in that, The interlayer concrete (7) is poured in a precast or cast-in-place manner, and the interlayer concrete (7) is high-strength concrete, self-compacting concrete, fiber-reinforced concrete, active powder concrete or ultra-high performance concrete.

6. A construction method for a double-steel-plate concrete composite pipeline with welded spaced square steel pipes as described in any one of claims 1 to 5, characterized in that, include: 1) In the factory, the arc-shaped inner steel plate (3) and the arc-shaped outer steel plate (2) are processed. The bottom surface of the square steel pipe (5) is welded to the outside of the arc-shaped inner steel plate (3). The perforated rib plate (6) is welded between adjacent square steel pipes (5). The arc-shaped outer steel plate (2) is welded to the top surface of the square steel pipe (5). A side plate (4) is welded to one axial end of the arc-shaped inner steel plate (3) and one axial end of the arc-shaped outer steel plate (2). 2) At the factory or on site, pour interlayer concrete (7) between adjacent square steel pipes (5), and weld a side plate (4) at the other axial end of the inner arc steel plate (3) and the other axial end of the outer arc steel plate (2) to complete the processing of the double steel plate concrete composite pipe segment (1); 3) On site, weld double steel plate concrete composite pipe segments (1) along the circumferential direction to splice them into a prefabricated pipe segment. Repeat the above splicing operation to obtain several prefabricated pipe segments. Weld adjacent prefabricated pipe segments along the length direction to obtain double steel plate concrete composite pipe.

7. The construction method according to claim 6, characterized in that, In step 1), before welding the perforated rib (6), equally spaced round holes (8) are opened at the center of the perforated rib (6), and before welding the square steel pipe (5), anti-shear studs (9) are welded on the outer side of the arc-shaped inner steel plate (3) and the inner side of the arc-shaped outer steel plate (2).

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