Penstock joint structure

Abstract

The application relates to a pressure steel pipe joint structure. The application is suitable for the technical field of water conservancy and hydropower engineering. The application aims to provide a pressure steel pipe joint structure. The application adopts the technical scheme that the pressure steel pipe joint structure comprises the following: a pressure steel pipe arranged on the upstream and downstream of a permanent joint; a plurality of stiffening rings arranged on the outer wall of the pressure steel pipe, which can improve the ring stiffness of the pressure steel pipe; and an elastic cushion layer arranged on the outer part of the pressure steel pipe and the stiffening rings, which can provide buffering for the structural displacement generated at the permanent joint.

Description

Technical Field

[0001] This utility model relates to the field of water conservancy and hydropower engineering technology, and in particular to a pressure steel pipe through-gap structure. Background Technology

[0002] In hydropower station water conveyance systems, traditional bedding pipe designs require that stiffening rings not be installed to accommodate uneven displacement at permanent joints, ensuring that the steel pipe has sufficient flexibility. However, for large-diameter pressure steel pipes with high external pressure risk, completely eliminating stiffening rings would lead to a significant increase in pipe wall thickness, resulting in poor economic efficiency and increased difficulty in construction due to excessive ellipticity or local buckling during transportation and installation.

[0003] Meanwhile, expansion joints are also used for pressure steel pipes passing through joints. Although the expansion joint solution can adapt to large displacements, it is costly and complex to maintain, and is not suitable for working conditions with small displacements but high stability requirements. Therefore, there is an urgent need for a pressure steel pipe joint structure that can both improve resistance to external pressure and adapt to minor structural displacements. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide a pressure steel pipe through-gap structure to address the above-mentioned problems.

[0005] The technical solution adopted in this utility model is: a pressure steel pipe through-gap structure, comprising: Pressure steel pipes are installed upstream and downstream of permanent joints; Multiple stiffening rings, arranged around the outer wall of the pressure steel pipe, can improve the circumferential stiffness of the pressure steel pipe; The elastic padding layer, covering the outside of the pressure steel pipe and stiffening ring, can buffer the structural displacement caused by permanent joints.

[0006] By employing the aforementioned technical methods, and by adding multiple stiffening rings to the outer wall of the pressure steel pipe, the wall thickness of the pressure steel pipe can be reduced, thus facilitating its installation. Furthermore, by using an elastic padding layer to wrap around the pressure steel pipe and the stiffening rings, the pressure steel pipe remains unrestrained during displacement.

[0007] In some embodiments, the elastic padding includes a steel pipe radial elastic padding, a stiffening ring radial elastic padding, and a stiffening ring axial elastic padding. The steel pipe radial elastic padding is used to wrap the outer wall of the pressure steel pipe. The stiffening ring radial elastic padding is used to wrap the two side walls of the stiffening ring along the axial direction of the pressure steel pipe. The stiffening ring axial elastic padding is used to wrap the side wall of the stiffening ring along the circumferential direction of the pressure steel pipe. One side of the stiffening ring radial elastic padding is connected to the stiffening ring axial elastic padding via adhesive tape, and the other side of the stiffening ring radial elastic padding is connected to the steel pipe radial elastic padding via adhesive tape.

[0008] In some embodiments, the resilient padding layer is made of polyurethane cork material.

[0009] In some embodiments, the exterior of the elastic pad is coated with a waterproof and alkali-resistant coating.

[0010] The beneficial effects of this utility model are: 1. By installing multiple stiffening rings on the outside of the pressure steel pipe, the circumferential stiffness and critical external pressure bearing capacity of the pressure steel pipe are effectively improved. This allows for a reduction in pipe wall thickness while meeting stability requirements, thereby lowering material costs and manufacturing difficulty. An elastic padding layer wraps around the stiffening rings and the entire steel pipe, forming a continuous flexible interface. When minor axial expansion, contraction, radial displacement, or angular deformation occurs at the permanent joint, the wrapped elastic padding layer absorbs the displacement through compression and shear deformation, ensuring that the displacement of the pressure steel pipe is unrestrained. Attached Figure Description

[0011] Figure 1 This is a longitudinal section diagram of the structure of this application.

[0012] Figure 2 This is a cross-sectional structural diagram of this application.

[0013] Explanation of reference numerals in the attached figures: 1. Pressure steel pipe; 2. Stiffening ring; 3. Axial elastic pad for stiffening ring; 4. Radial elastic pad for steel pipe; 5. Radial elastic pad for stiffening ring.

[0014] This specification includes references to "one embodiment" or "implementation". The use of the phrase "in one embodiment" or "in an embodiment" does not necessarily refer to the same embodiment. Specific features, structures, or characteristics may be combined in any suitable manner consistent with this disclosure.

[0015] The term "comprising" is open-ended. As used in the appended claims, it does not exclude additional structures or steps.

[0016] "First," "second," etc. As used in this article, these terms serve as labels for the nouns preceding them and do not imply any type of ordering (e.g., spatial, temporal, logical, etc.). Detailed Implementation

[0017] To enable those skilled in the art to better understand the present invention, the technical solution of the present invention will be further described below with reference to specific embodiments.

[0018] Example 1: Combination Figure 1 and Figure 2As shown, this embodiment is a pressure steel pipe joint structure, including a pressure steel pipe 1, multiple stiffening rings 2, and an elastic pad. The pressure steel pipe 1 is located upstream and downstream of the permanent joint. The outer wall of the pressure steel pipe 1 is circumferentially provided with multiple stiffening rings 2, which can improve the circumferential stiffness of the pressure steel pipe 1. The pressure steel pipe 1 and the stiffening rings 2 are covered with an elastic pad, which can buffer the structural displacement generated at the permanent joint.

[0019] Furthermore, in this embodiment, the pressure steel pipe 1 is positioned upstream and downstream of the permanent joint with relatively small displacement. The stiffening ring 2 is welded to the pressure steel pipe 1, and the elastic pad wraps around the pressure steel pipe 1 and the stiffening ring 2 in a 360° manner, tightly fitting them together.

[0020] In some embodiments, the elastic padding includes a steel pipe radial elastic padding 4, a stiffening ring radial elastic padding 5, and a stiffening ring axial elastic padding 3. The steel pipe radial elastic padding 4 is used to wrap the outer wall of the pressure steel pipe 1. The stiffening ring radial elastic padding 5 is used to wrap the two side walls of the stiffening ring 2 along the axial direction of the pressure steel pipe 1. The stiffening ring axial elastic padding 3 is used to wrap the side wall of the stiffening ring 2 along the circumferential direction of the pressure steel pipe 1. One side of the stiffening ring radial elastic padding 5 is connected to the stiffening ring axial elastic padding 3 by adhesive tape, and the other side of the stiffening ring radial elastic padding 5 is connected to the steel pipe radial elastic padding 4 by adhesive tape.

[0021] Since the stiffening ring 2 is a component protruding from the outer wall of the pressure steel pipe 1, it is difficult to wrap it as a whole. In this embodiment, the elastic pad is designed in sections to ensure that the pad is tightly fitted to the steel pipe body, the sides and ends of the stiffening ring 2 without cavities, thus avoiding stress concentration or local delamination. At the same time, since the pad is pre-applied with adhesive to fix it to the steel pipe, and then the sections are prefabricated and the pads are connected and fixed with tape, the tape can prevent cement slurry from penetrating into the outer wall of the steel pipe through the gaps between the pads, which facilitates on-site construction and assembly, and improves installation efficiency and bonding quality. Among them, the axial elastic pad of the stiffening ring allows the steel pipe to expand and contract freely along the axial direction, reducing the obstruction to permanent joint displacement, and the radial elastic pad of the stiffening ring can buffer the shear and compression between the stiffening ring 2 and the outer concrete, preventing concrete cracking.

[0022] In this embodiment, the elastic cushion layer is mainly used to prevent excessive concrete stress and damage to the concrete structure caused by the permanent joint closing or opening of the steel pipe without deformation space during earthquakes or high water levels upstream. With this cushion layer, the steel pipe and stiffening ring in the cushion section will act as a free section to absorb this energy. At the same time, the thickness of the elastic cushion layer can be adaptively adjusted according to the calculated displacement results, so it will not affect the weld.

[0023] Furthermore, the elastic padding layer is made of polyurethane cork material.

[0024] Polyurethane cork is a low-density, airtight, and water-impermeable material with excellent elasticity, pressure resistance, water resistance, and thermal insulation properties, as well as stable chemical properties. It can withstand the shear forces generated by minor misalignments in permanent seams.

[0025] Furthermore, the exterior of the elastic pad is coated with a waterproof and alkali-resistant coating.

[0026] Specifically, in actual projects, ordinary exterior wall latex paint can also be used, as it can provide waterproof and alkaline corrosion resistance.

[0027] Furthermore, in this embodiment, the thickness of the elastic pad is adjusted according to the main displacement direction of the pressure steel pipe 1. The axial thickness and radial thickness can take different values.

[0028] The implementation principle of the pressure steel pipe through-gap structure in this embodiment is as follows: Traditional solutions, such as expansion joints, are sufficient for large deformations, but are inadequate for small deformations. This structure provides a corresponding technical solution for small deformations. By welding multiple stiffening rings 2 to the outside of the pressure steel pipe 1, the circumferential stiffness of the pressure steel pipe 1 is increased, enabling it to resist external pressure instability and thus allowing for thinning of the pipe wall. A fully encapsulated, segmented elastic padding layer physically isolates the stiffening rings 2 from the outer concrete casing. This elastic padding layer possesses compressible / shear deformation capabilities in the axial, radial, and circumferential directions. When a small displacement occurs in the permanent joint, the padding layer absorbs the displacement through its own deformation, preventing the rigid stiffening rings 2 from transmitting the restraint reaction force to the concrete or adjacent pipe sections. Furthermore, the waterproof and alkali-resistant coating on the outside of the elastic padding layer protects the long-term performance of the padding material.

[0029] Example 2: This embodiment describes a construction method for a pressure steel pipe joint structure, applied to the pressure steel pipe joint structure in Embodiment 1, and includes the following steps: S1. Weld a stiffening ring 2 to the outside of the pressure steel pipe 1; S2. Wrap the radial elastic pad 4 of the steel pipe and the radial elastic pad 5 of the stiffening ring around the outside of the pressure steel pipe 1 and the stiffening ring 2 respectively. S3. Wrap a stiffening ring axial elastic pad 3 around the outside of the stiffening ring 2; S4. Apply a waterproof and alkali-resistant coating to the outside of the elastic padding layer; S5. Concrete is poured outside the pressure steel pipe 1 and the stiffening ring 2.

[0030] The above are all preferred embodiments of this utility model, and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape and principle of this utility model should be included within the scope of protection of this utility model.

Claims

1. A pressure steel pipe through-gap structure, characterized in that, include: Pressure steel pipe (1) is located upstream and downstream of the permanent joint; Multiple stiffening rings (2) are arranged on the outer wall of the pressure steel pipe (1) to improve the circumferential stiffness of the pressure steel pipe (1); An elastic pad, covering the outside of the pressure steel pipe (1) and the stiffening ring (2), can provide a buffer for structural displacement caused by permanent joints.

2. The pressure steel pipe through-gap structure according to claim 1, characterized in that: The elastic padding layer includes a steel pipe radial elastic padding layer (4), a stiffening ring radial elastic padding layer (5), and a stiffening ring axial elastic padding layer (3). The steel pipe radial elastic padding layer (4) is used to wrap the outer wall of the pressure steel pipe (1). The stiffening ring radial elastic padding layer (5) is used to wrap the two side walls of the stiffening ring (2) along the axial direction of the pressure steel pipe (1). The stiffening ring axial elastic padding layer (3) is used to wrap the side wall of the stiffening ring (2) along the circumferential direction of the pressure steel pipe (1). One side of the stiffening ring radial elastic padding layer (5) is connected to the stiffening ring axial elastic padding layer (3) by adhesive tape, and the other side of the stiffening ring radial elastic padding layer (5) is connected to the steel pipe radial elastic padding layer (4) by adhesive tape.

3. The pressure steel pipe through-gap structure according to claim 1, characterized in that: The elastic padding layer is made of polyurethane cork material.

4. The pressure steel pipe through-gap structure according to claim 1, characterized in that: The elastic pad is coated with a waterproof and alkali-resistant coating.

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