Compact unbraced y-piece structure for hydrostatic testing

Abstract

The utility model provides a compact no support taper Y type steel bifurcated pipe structure for hydrostatic test, including main taper, main taper pipe, support taper pipe, reinforcing rib, main taper blind, support taper pipe blind and gear type reinforcing ring to the steel plate, the upstream side of main taper is coaxial welding main taper blind through gear type reinforcing ring to the steel plate, the downstream side of main taper is coaxial welding main taper pipe, the downstream side of main taper pipe is symmetrical each welding fixed one support taper pipe left and right, sets up reinforcing rib between two support taper pipes, the downstream side of each support taper pipe is coaxial welding support taper pipe blind through gear type reinforcing ring to the steel plate. The utility model can effectively solve the problem of the big size of steel bifurcated pipe hydrostatic test body, the big thickness of blind and the poor quality of blind and main pipe weld, thereby reducing the traffic hole, construction support hole excavation section size, saving the project investment and construction period, improving the blind and steel bifurcated pipe weld joint quality simultaneously, avoiding the security risk of steel bifurcated pipe body type hydrostatic test, providing a novel device for steel bifurcated pipe hydrostatic test.

Description

Technical Field

[0001] This utility model relates to a steel branch pipe structure, specifically a compact, unsupported cone-shaped Y-shaped steel branch pipe structure for hydrostatic testing. Background Technology

[0002] With rapid economic development, the demand for energy is increasing daily. Hydropower, as a clean, low-carbon, and renewable energy source, is seeing a surge in the construction of pumped storage power station projects. The main function of the steel branch pipe in the water conveyance system of a pumped storage power station is to connect one main pipe and two branch pipes of the water diversion tunnel, creating a "one tunnel, two turbines" layout, significantly improving the utilization rate and overall economic benefits of the pumped storage power station. Currently, the steel branch pipe is a complex spatial structure composed of multiple components. The downstream side of the branch pipe requires welding of a support cone, resulting in increasingly larger steel branch pipes. This often leads to difficulties in transportation, construction, and the large amount of excavation required for branch tunnels and access tunnels, as well as challenges in hoisting. Furthermore, during hydrostatic testing, the weld quality at the end of the steel branch pipe often fails to meet the requirements, leading to weld cracking during the test and preventing successful completion of the hydrostatic test. Utility Model Content

[0003] To address the shortcomings of existing technologies, this invention provides a compact, unsupported cone-shaped steel branch pipe structure for hydrostatic testing, which effectively solves the aforementioned problems.

[0004] The technical solution adopted in this utility model is as follows:

[0005] This utility model provides a compact, unsupported cone Y-shaped steel branch pipe structure for hydrostatic testing, including a main cone (1), a main cone pipe (2), a branch cone pipe (3), a reinforcing rib plate (4), a main cone end cap (5), a branch cone pipe end cap (6), and a gear-type reinforcing circumferential steel plate (7);

[0006] The upstream side of the main cone (1) is coaxially welded with the main cone end cap (5) through the gear-type reinforcing circumferential steel plate (7);

[0007] The main cone (1) is coaxially welded to the downstream side of the main cone tube (2); a branch cone tube (3) is symmetrically welded to the downstream side of the main cone tube (2); a reinforcing rib (4) is provided between the two branch cone tubes (3); the branch cone tube end cap (6) is coaxially welded to the downstream side of each branch cone tube (3) through the gear-type reinforcing circumferential steel plate (7).

[0008] Preferably, the main cone end cap (5) is hemispherical, and its inner diameter is the same as the upstream dimension of the main cone (1).

[0009] Preferably, the end cap (6) of the branch tapered tube is semi-ellipsoidal, and its major axis is the same as the downstream dimension of the branch tapered tube (3).

[0010] Preferably, the compact unsupported cone-shaped steel branch pipe structure used for hydrostatic testing is a symmetrical Y-shaped internally reinforced crescent-rib steel branch pipe with a branching angle between 60° and 70°.

[0011] Preferably, the waistline angle between the main cone (1) and the main cone tube (2) is between 5° and 10°; the waistline angle between the main cone tube (2) and the branch cone tube (3) is between 5° and 10°.

[0012] Preferably, the gear-type reinforcing circumferential steel plate (7) includes a circumferential connecting steel plate (8) and a longitudinal connecting steel plate (9);

[0013] The circumferential connecting steel plate (8) is welded to the outside of the circumferential weld of the main cone (1) and the main cone end (5), and the longitudinal connecting steel plate (9) is arranged at equal intervals on both sides of the circumferential connecting steel plate (8);

[0014] The circumferential connecting steel plate (8) is welded to the outside of the circumferential weld of the support tapered pipe (3) and the support tapered pipe end (6), and the longitudinal connecting steel plate (9) is arranged at equal intervals on both sides of the circumferential connecting steel plate (8).

[0015] The compact, unsupported tapered Y-shaped steel branch pipe structure for hydrostatic testing provided by this utility model has the following advantages:

[0016] This invention effectively solves the problems of large size, thick end cap, and poor weld quality between the end cap and the main pipe in water pressure testing of steel branch pipes. Without the need for a support cone, this invention can effectively meet all the indicators of water pressure testing, thereby reducing the size of the water pressure testing device and the thickness of the end cap, thus reducing the excavation cross-section size of traffic tunnels and construction adits, saving project investment and construction time. Simultaneously, it improves the fit quality of the weld between the end cap and the steel branch pipe, avoiding the safety risks associated with water pressure testing of steel branch pipes, and providing a novel device for water pressure testing of steel branch pipes. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the compact, unsupported cone-shaped steel branch pipe structure of this utility model used for hydrostatic testing;

[0018] Figure 2 This is a schematic diagram of the rib plate structure of this utility model;

[0019] Figure 3 This is a side view of the compact, unsupported cone-shaped steel branch pipe structure of this utility model used for hydrostatic testing;

[0020] Figure 4 This is a schematic plan view of the compact, unsupported cone-shaped steel branch pipe structure of this utility model used for hydrostatic testing;

[0021] Figure 5 This is a cross-sectional view of the gear-type reinforced circumferential steel plate of this utility model;

[0022] Figure 6 This is a plan view of the gear-type reinforced circumferential steel plate of this utility model.

[0023] In the picture:

[0024] 1---Main cone, 2---Main cone tube, 3---Support cone tube, 4---Reinforcing rib, 5---Main cone end cap, 6---Support cone tube end cap, 7---Gear-type reinforcing circumferential steel plate, 8---Circumferential connecting steel plate, 9---Longitudinal connecting steel plate. Detailed Implementation

[0025] To make the technical problems solved, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0026] This invention effectively solves the problems of large size, thick end cap, and poor weld quality between the end cap and the main pipe in water pressure testing of steel branch pipes. Without the need for a support cone, this invention can effectively meet all the indicators of water pressure testing, thereby reducing the size of the water pressure testing device and the thickness of the end cap, thus reducing the excavation cross-section size of traffic tunnels and construction adits, saving project investment and construction time. Simultaneously, it improves the fit quality of the weld between the end cap and the steel branch pipe, avoiding the safety risks associated with water pressure testing of steel branch pipes, and providing a novel device for water pressure testing of steel branch pipes.

[0027] This utility model provides a compact, unsupported tapered Y-shaped steel branch pipe structure for hydrostatic testing, such as... Figures 1 to 6 As shown, it includes a main cone 1, a main cone tube 2, a branch cone tube 3, a reinforcing rib 4, a main cone end cap 5, a branch cone tube end cap 6, and a gear-type reinforcing circumferential steel plate 7;

[0028] The upstream side of the main cone 1 is coaxially welded with the main cone end cap 5 through the gear-type reinforcing circumferential steel plate 7; the main cone end cap 5 is hemispherical and its inner diameter is the same as the upstream dimension of the main cone 1.

[0029] The main cone 1 is coaxially welded to the downstream side of the main cone tube 2; a branch cone tube 3 is symmetrically welded and fixed to the downstream side of the main cone tube 2; a reinforcing rib 4 is provided between the two branch cone tubes 3; and a branch cone tube end cap 6 is coaxially welded to the downstream side of each branch cone tube 3 through the gear-type reinforcing circumferential steel plate 7. The branch cone tube end cap 6 is semi-ellipsoidal, and its major axis is the same as the downstream dimension of the branch cone tube 3.

[0030] like Figure 3 , 4 As shown, the main cone end cap 5 and the branch cone pipe end cap 6 are set to ensure that the steel branch pipe can be tested normally under water pressure.

[0031] The compact, unsupported cone-shaped Y-shaped steel branch pipe structure used for hydrostatic testing is a symmetrical Y-shaped internally reinforced crescent-rib steel branch pipe with a branching angle between 60° and 70°.

[0032] The waistline angle between the main cone 1 and the main cone tube 2 is between 5° and 10°; the waistline angle between the main cone tube 2 and the branch cone tube 3 is between 5° and 10°.

[0033] like Figure 5 , 6 As shown, the gear-type reinforcing circumferential steel plate 7 includes a circumferential connecting steel plate 8 and a longitudinal connecting steel plate 9. The circumferential connecting steel plate 8 is welded to the outside of the circumferential weld of the main cone 1 and the main cone end cap 5. The longitudinal connecting steel plates 9 are equally spaced on both sides of the circumferential connecting steel plate 8. Similarly, the circumferential connecting steel plate 8 is welded to the outside of the circumferential weld of the branch cone pipe 3 and the branch cone end cap 6. The longitudinal connecting steel plates 9 are equally spaced on both sides of the circumferential connecting steel plate 8. For example, the circumferential spacing of the longitudinal connecting steel plates 9 should not exceed 30°, and their dimensions are 20×200×400mm. The circumferential connecting steel plate 8 is 60mm wide and 20mm thick. By welding the gear-type reinforcing circumferential steel plate 7 and fixing it to the outer surface of the weld of the steel branch pipe, the risk of weld cracking during the hydrostatic test of the steel branch pipe can be reduced.

[0034] Therefore, this utility model provides a compact, unsupported cone-shaped Y-shaped steel branch pipe structure for hydrostatic testing, which is particularly suitable for situations where traffic tunnels or construction tunnels are long, construction periods are long, and the workload is large due to engineering layout constraints. The dimensions of each part of the main cone 1, main cone pipe 2, and branch cone pipe 3 are determined by engineering design, and they are assembled by splicing and welding high-strength steel plates. The main cone end cap 5 is hemispherical, and the branch cone pipe end cap 6 is semi-elliptical, which can ensure that the steel branch pipe can undergo hydrostatic testing. The reinforcing rib plate 4 is set at the joint of the two branch cone pipes 3, and the steel branch pipe and the reinforcing rib plate 4 are connected into a whole by welding. The gear-type reinforcing circumferential steel plate 7 is welded from multiple connecting steel plates.

[0035] After welding, the weld seams of the steel branch pipes need to be finely ground and polished with saturated brine electrolyte until the grinding marks are eliminated. Then, patching, wiring, labeling, and measuring point arrangement are performed inside the steel branch pipe. For the compact, unsupported cone-shaped Y-shaped steel branch pipe structure used in hydrostatic testing, the hydrostatic testing instruments are arranged symmetrically along the centerline of the main water flow and placed at various points on the steel branch pipe, such as resistance strain gauges, to monitor the stress, deformation, and other indicators of the steel branch pipe.

[0036] This utility model provides a compact, unsupported Y-shaped steel branch pipe structure for hydrostatic testing. The downstream side of the branch pipe no longer has a support cone, eliminating the support cone section. Testing has shown that this effectively meets all hydrostatic testing requirements, thereby reducing the size of the hydrostatic testing device for the steel branch pipe. This reduces the excavation cross-sectional size of traffic tunnels and construction adits, saving on project investment and construction time. It also avoids the safety risks associated with welding inside the steel branch pipe. It is particularly suitable for situations where the project layout is affected, traffic tunnels or construction adits are long, and the construction period and workload are large, providing a novel device for hydrostatic testing of steel branch pipes.

[0037] This utility model provides a compact, unsupported cone-shaped Y-shaped steel branch pipe structure for hydrostatic testing. By setting gear-type reinforcing circumferential steel plates to strengthen the weld, the strength and thickness of the end cap are reduced, thereby reducing the excavation cross-sectional size of traffic tunnels and construction adits, saving project investment and construction time. At the same time, it can also effectively avoid the safety risk of weld cracking during hydrostatic testing of steel branch pipes, providing a new structure for hydrostatic testing of steel branch pipes.

[0038] This utility model provides a compact, unsupported cone-shaped steel branch pipe structure for hydrostatic testing. The structure has a clear function, is simple in structure, and is easy to construct, providing a new type of device for hydrostatic testing of steel branch pipes.

[0039] The following is a detailed description of a large-scale project that adopted the technical solution of this utility model.

[0040] The project has a total installed capacity of 1400MW and a rated hydroelectric head of 449m. The water supply system consists of two parts: a water intake system and a tailrace system. Both systems are arranged in a single tunnel with two turbines, forming two independent water supply systems (No. 1 and No. 2). The high-pressure steel branch pipe is located between the lower horizontal section of the high-pressure pipeline and the upstream section of the powerhouse. The vertical distance between the branch pipe and the upstream sidewall of the powerhouse is 46.9m, and the two branch pipes are arranged in parallel. The steel branch pipe adopts a symmetrical "Y"-shaped internally reinforced crescent-rib type, with a branch angle of 70°. The vertical distance from the center of the high-pressure branch pipe to the centerline of the unit is approximately 60.51m. The main pipe diameter is 5m, the branch pipe diameter is 3.4m, the maximum common tangent ball diameter is 5.6m, the center elevation is 821.00m, the maximum static head the branch pipe can withstand is 571.0m, and the design internal water pressure is 7.8MPa (795m head). The steel branch pipes are made of 800MPa high-strength steel plates. The wall thickness of the main cone 1 is 60mm, the wall thickness of the main cone pipe 2 is 64mm, the wall thickness of the branch cone pipe 3 is 64mm, the thickness of the reinforcing rib plate 4 is 136mm, and the waistline bend angles between the main cone 1 and the main cone pipe 2, and between the main cone pipe 2 and the branch cone pipe 3 are 6° and 5.5°, respectively.

[0041] Because the tunnel excavation cross-section in the project is determined by a conventional Y-shaped steel branch pipe hydrostatic testing device, further difficulties arise such as transportation challenges, construction difficulties, large excavation volumes for branch tunnels and access tunnels, and hoisting difficulties. Therefore, this utility model's technical solution is adopted. Figure 1-2 As shown, the main cone end cap 5 is welded upstream of the main cone 1, and the branch cone end cap 6 is welded downstream of the branch cone pipe 3. The downstream of the main cone 1 is welded to the main cone pipe 2, and the main cone pipe 2 is welded to the two branch cone pipes 3 respectively. Reinforcing ribs 4 are arranged between the two branch cone pipes 3. The novel branchless hydrostatic testing device for Y-shaped steel branch pipe hydrostatic testing has external dimensions of 6.07m × 6.975m × 6.02m (length × width × height). Compared with conventional methods, this utility model reduces the width dimension by 0.646m and the rock excavation tunnel by 35,000m. 3 .

[0042] By adopting the above-disclosed technical solution of this utility model, the requirements of a compact, unsupported cone-shaped hydrostatic test device for Y-shaped steel branch pipe hydrostatic testing are met, solving the problem of large steel branch pipe size in traditional pumped storage power stations, reducing the amount of tunnel excavation, lining concrete, and tunnel support, accelerating construction progress, and saving project investment.

[0043] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A compact, unsupported tapered Y-shaped steel branch pipe structure for hydrostatic testing, characterized in that, It includes a main cone (1), a main cone tube (2), a branch cone tube (3), a reinforcing rib (4), a main cone end cap (5), a branch cone tube end cap (6), and a gear-type reinforcing circumferential steel plate (7); The upstream side of the main cone (1) is coaxially welded with the main cone end cap (5) through the gear-type reinforcing circumferential steel plate (7); The main cone (1) is coaxially welded to the downstream side of the main cone tube (2); a branch cone tube (3) is symmetrically welded to the downstream side of the main cone tube (2); a reinforcing rib (4) is provided between the two branch cone tubes (3); the branch cone tube end cap (6) is coaxially welded to the downstream side of each branch cone tube (3) through the gear-type reinforcing circumferential steel plate (7).

2. The compact, unsupported tapered Y-shaped steel branch pipe structure for hydrostatic testing according to claim 1, characterized in that, The main cone end cap (5) is hemispherical, and its inner diameter is the same as the upstream dimension of the main cone (1).

3. The compact, unsupported tapered Y-shaped steel branch pipe structure for hydrostatic testing according to claim 1, characterized in that, The end cap (6) of the branch tapered tube is semi-ellipsoidal, and its major axis is the same as the downstream dimension of the branch tapered tube (3).

4. The compact, unsupported tapered Y-shaped steel branch pipe structure for hydrostatic testing according to claim 1, characterized in that, The compact, unsupported cone-shaped steel branch pipe structure used for hydrostatic testing is a symmetrical Y-shaped internally reinforced crescent-rib steel branch pipe with a branching angle between 60° and 70°.

5. The compact, unsupported tapered Y-shaped steel branch pipe structure for hydrostatic testing according to claim 1, characterized in that, The waistline angle between the main cone (1) and the main cone tube (2) is between 5° and 10°; the waistline angle between the main cone tube (2) and the branch cone tube (3) is between 5° and 10°.

6. The compact, unsupported tapered Y-shaped steel branch pipe structure for hydrostatic testing according to claim 1, characterized in that, The gear-type reinforced circumferential steel plate (7) includes a circumferential connecting steel plate (8) and a longitudinal connecting steel plate (9); The circumferential connecting steel plate (8) is welded to the outside of the circumferential weld of the main cone (1) and the main cone end (5), and the longitudinal connecting steel plate (9) is arranged at equal intervals on both sides of the circumferential connecting steel plate (8); The circumferential connecting steel plate (8) is welded to the outside of the circumferential weld of the support tapered pipe (3) and the support tapered pipe end (6), and the longitudinal connecting steel plate (9) is arranged at equal intervals on both sides of the circumferential connecting steel plate (8).

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