External drainage structure of pressure steel pipe
By designing a rock wall drainage structure and an attached drainage structure suitable for the outside of the underground pressure steel pipe, the problem of high water head outside the underground pressure steel pipe is solved, and the stability and safety of the steel pipe are improved.
Patent Information
- Application Number
- CN202421944995.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-12
- Publication Date
- 2025-05-20
- Estimated Expiration
- 2034-08-12
AI Technical Summary
The pressure measuring pipe outside the underground pressure steel pipe has a high head, which causes the steel pipe to be easily rusted and reduces operating stability and safety.
A pressure steel pipe external drainage structure is designed, including rock wall drainage structure and wall drainage structure. The rock wall drainage structure is connected to the rock wall drainage main pipe through the system drainage hole. The wall drainage structure collects water flow through longitudinal water collection angle steel and circumferential water collection channel steel and discharges it into the wall drainage main pipe.
It effectively reduces the pressure measuring pipe head outside the underground pressure steel pipe, and improves the operating stability and safety of the steel pipe.
Smart Images
Figure CN222886893U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of external drainage structures for penstock pipes in water conservancy and hydropower projects, and particularly relates to an external drainage structure for a penstock pipe. Background Art
[0002] The buried depth of the underground penstock structure of a pumped storage power station reaches 300 - 600 m at deeper parts, with a relatively high groundwater level. In addition, there is also water with a certain pressure between the concrete backfilled outside the penstock pipe and the surrounding rock. Therefore, the external water pressure on the penstock pipe is relatively large, resulting in a relatively high piezometric head of the piezometer outside the underground penstock pipe, and the underground penstock pipe is prone to corrosion, thereby reducing the operation stability and safety of the penstock pipe. Content of the Utility Model
[0003] Aiming at the defects existing in the prior art, the utility model provides an external drainage structure for a penstock pipe, which can effectively solve the above problems.
[0004] The technical solution adopted by the utility model is as follows:
[0005] The utility model provides an external drainage structure for a penstock pipe, which includes a rock wall drainage structure and a wall-attached drainage structure; the rock wall drainage structure includes a system drainage hole (1), a rock wall drainage main pipe (3) and a rock wall drainage branch pipe (11); along the direction of the tunnel axis at the bottom of the rock wall, a plurality of the rock wall drainage main pipes (3) are distributed and arranged; a plurality of the system drainage holes (1) are arranged on the surface of the rock wall; one end of the rock wall drainage branch pipe (11) is inserted into each of the system drainage holes (1), and the other end of the rock wall drainage branch pipe (11) extends downward along the rock wall and is communicated with the rock wall drainage main pipe (3);
[0006] The wall-attached drainage structure includes a wall-attached water collection unit and a wall-attached drainage main pipe (6); on the outer surface of the steel pipe lining (7), a plurality of the wall-attached water collection units are arranged along the water flow direction; each wall-attached water collection unit includes a longitudinal water collection angle steel (4) and a circumferential water collection channel steel (5); the longitudinal water collection angle steel (4) is arranged on the outer peripheral surface of the steel pipe lining (7) along the water flow direction; the circumferential water collection channel steel (5) is installed at the downstream end of each of the longitudinal water collection angle steels (4); the circumferential water collection channel steel (5) is fixedly sleeved on the outer periphery of the steel pipe lining (7); the wall-attached drainage main pipe (6) is arranged in the backfill concrete (8) below the steel pipe lining (7) along the direction of the tunnel axis, and the bottom of the circumferential water collection channel steel (5) is communicated with the wall-attached drainage main pipe (6).
[0007] Preferably, reinforcing bars or anchor bolts (2) are arranged below the rock wall drainage main pipe (3), and the reinforcing bars or anchor bolts (2) support the rock wall drainage main pipe (3).
[0008] Preferably, the rock wall drainage branch pipe (11) is a rigid plastic perforated pipe.
[0009] Preferably, both the rock wall drainage main pipe (3) and the wall-attached drainage main pipe (6) are galvanized pipes.
[0010] Preferably, the bottom of the circumferential water collecting channel steel (5) is communicated with the wall-attached drainage main pipe (6) through a connecting pipe (12).
[0011] Preferably, the connection part of the longitudinal water collecting angle steel (4) and the steel pipe lining (7) is fixed by skip welding; the non-welded part is coated with industrial soap and pasted with non-woven fabric.
[0012] Preferably, the circumferential water collecting channel steel (5) is arranged between two stiffening rings (9) on the surface of the steel pipe lining (7); the connection part of the circumferential water collecting channel steel (5) and the steel pipe lining (7) is fixed by skip welding; the non-welded part is coated with industrial soap and pasted with non-woven fabric.
[0013] Preferably, the circumferential water collecting channel steel (5) is provided with a triangular opening at the entrance of the longitudinal water collecting angle steel (4) on the downstream side in the water flow direction, and the opening size is smaller than the size of the longitudinal water collecting angle steel (4); the outer surfaces of the longitudinal water collecting angle steel (4) and the circumferential water collecting channel steel (5) are fully welded at the connection part.
[0014] Preferably, the joints of the wall-attached drainage main pipe (6) and the connection parts with the circumferential water collecting channel steel (5) are fully welded.
[0015] Preferably, the wall-attached drainage main pipe (6) is 10 cm above the ground in the flat section.
[0016] The external drainage structure of the penstock provided by the present utility model has the following advantages:
[0017] The present utility model provides an external drainage structure of a penstock, which is a drainage system arranged between the backfill concrete and the surrounding rock outside the underground penstock and between the steel pipe and the backfill concrete, with strong applicability and good drainage effect. Through this drainage system, the piezometric tube head on the outside of the underground penstock can be effectively reduced, and the operation stability and safety of the penstock are improved. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a sectional view of the external drainage structure of the penstock provided by the present utility model;
[0019] Wherein: 1 - System drainage hole; 2 - Inserted reinforcement or anchor rod; 3 - Main rock wall drainage pipe; 4 - Longitudinal water collection angle steel; 5 - Circumferential water collection channel steel; 6 - Adjacent wall main drainage pipe; 7 - Steel pipe lining; 8 - Backfill concrete; 9 - Stiffening ring; 10 - Surrounding rock symbol; 11 - Rock wall drainage branch pipe; 12 - Connecting pipe. Detailed implementation manner
[0020] In order to make the technical problems, technical solutions and beneficial effects solved by the present utility model clearer, the present utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.
[0021] The present utility model provides an external drainage structure for a penstock, which is a drainage system arranged between the backfill concrete outside the underground penstock and the surrounding rock, with strong applicability and good drainage effect. Through this drainage system, the piezometric tube head outside the underground penstock can be effectively reduced, and the operation stability and safety of the penstock are improved.
[0022] Refer to Figure 1 , the present utility model provides an external drainage structure for a penstock, including a rock wall drainage structure and an adjacent wall drainage structure;
[0023] The rock wall drainage structure includes a system drainage hole 1, a main rock wall drainage pipe 3 and a rock wall drainage branch pipe 11; along the direction of the tunnel axis at the bottom of the rock wall, a plurality of main rock wall drainage pipes 3 are distributed and arranged; specifically, an inserted reinforcement or an anchor rod 2 is arranged below the main rock wall drainage pipe 3, and the inserted reinforcement or the anchor rod 2 supports the main rock wall drainage pipe 3. A plurality of system drainage holes 1 are arranged on the surface of the rock wall; one end of the rock wall drainage branch pipe 11 is inserted into each system drainage hole 1, and the other end of the rock wall drainage branch pipe 11 extends downward along the rock wall and is communicated with the main rock wall drainage pipe 3; wherein, the rock wall drainage branch pipe 11 can be a rigid plastic perforated pipe.
[0024] The adjacent wall drainage structure includes an adjacent wall water collection unit and an adjacent wall main drainage pipe 6; on the outer surface of the steel pipe lining 7, a plurality of adjacent wall water collection units are arranged along the water flow direction; each adjacent wall water collection unit includes a longitudinal water collection angle steel 4 and a circumferential water collection channel steel 5; the longitudinal water collection angle steel 4 is arranged on the outer peripheral surface of the steel pipe lining 7 along the water flow direction; a circumferential water collection channel steel 5 is installed at the downstream end of each longitudinal water collection angle steel 4; the circumferential water collection channel steel 5 is fixedly sleeved on the outer periphery of the steel pipe lining 7; an adjacent wall main drainage pipe 6 is arranged along the tunnel axis direction in the backfill concrete 8 below the steel pipe lining 7, and the bottom of the circumferential water collection channel steel 5 is communicated with the adjacent wall main drainage pipe 6. In actual application, the bottom of the circumferential water collection channel steel 5 is communicated with the adjacent wall main drainage pipe 6 through a connecting pipe 12.
[0025] In practical applications, both the rock wall drainage main pipe 3 and the wall-attached drainage main pipe 6 are galvanized pipes. The connection parts of the longitudinal water collection angle steel 4 and the steel pipe lining 7 are fixed by skip welding; the non-welded parts are sealed with industrial soap and covered with non-woven fabric. The circumferential water collection channel steel 5 is arranged between two stiffening rings 9 on the surface of the steel pipe lining 7; the connection parts of the circumferential water collection channel steel 5 and the steel pipe lining 7 are fixed by skip welding; the non-welded parts are sealed with industrial soap and covered with non-woven fabric. The circumferential water collection channel steel 5 has a triangular opening at the entrance of the longitudinal water collection angle steel 4 on the downstream side in the water flow direction, and the opening size is smaller than the size of the longitudinal water collection angle steel 4; the outer surfaces of the longitudinal water collection angle steel 4 and the circumferential water collection channel steel 5 are fully welded at the connection part. The joints of the wall-attached drainage main pipe 6 and the connection parts with the circumferential water collection channel steel 5 are fully welded. The wall-attached drainage main pipe 6 is 10 cm above the ground in the flat section.
[0026] In the present utility model, in order to improve the reliability of the external drainage system of the penstock, a rock wall drainage system and a wall-attached drainage system are respectively arranged. The two drainage systems are not connected to each other and work independently. When one drainage system fails, the other drainage system can still be used normally. Through this drainage system, the piezometric tube head on the outside of the underground penstock can be effectively reduced, and the operation stability and safety of the penstock are improved.
[0027] The following introduces two embodiments:
[0028] Embodiment 1:
[0029] This embodiment provides an external drainage system for a penstock. In order to improve the reliability of the external drainage system of the penstock, a rock wall drainage system and a wall-attached drainage system are respectively arranged. The two drainage systems are not connected to each other and work independently. When one drainage system fails, the other drainage system can still be used normally.
[0030] The rock wall drainage system mainly drains the water between the backfill concrete 8 and the surrounding rock. System drainage holes 1 with a certain drainage spacing are arranged on the excavated hole wall at a distance of 1.5 - 2.5 m from the bottom plate or the anchor rod. Hard plastic perforated pipes are inserted as the rock wall drainage branch pipes 11. The hard plastic perforated pipes extend downward along the hole wall to the foot or the erected anchor rod and are connected to the rock wall drainage main pipe 3. The water in the rock wall drainage main pipe 3 is drained to the outside of the hole through the construction branch tunnel inspection drainage corridor, or drained to the underground power house drainage ditch.
[0031] The wall-attached drainage system is mainly used to drain the water between the steel pipe lining 7 and the backfill concrete 8. Its structure is as follows: several longitudinal water-collecting angle steels 4 are arranged on the upper 180° and lower 180° along the tunnel axis on the outside of the steel pipe lining 7, and circumferential water-collecting channel steels 5 are arranged every few pipe sections. A wall-attached drainage main pipe 6 is arranged in the lower backfill concrete 8. The water collected by the longitudinal water-collecting angle steels 4 is drained into the circumferential water-collecting channel steels 5, the water collected by the circumferential water-collecting channel steels 5 is drained into the wall-attached drainage main pipe 6, and the water in the wall-attached drainage main pipe 6 is drained to the outside of the tunnel through the maintenance drainage gallery of the construction adit, or drained to the drainage ditch of the underground power house.
[0032] Among them, the connection part of the longitudinal water-collecting angle steel 4 and the steel pipe lining 7 is skip-welded, and the non-welded part is coated with industrial soap, pasted with non-woven fabric, and then backfilled with concrete.
[0033] The circumferential water-collecting channel steel 5 is arranged between two stiffening rings 9. The connection part of the circumferential water-collecting channel steel 5 and the steel pipe lining 7 is skip-welded, and the bottom 90° range is full-welded. The non-welded part is coated with industrial soap, pasted with non-woven fabric, and then backfilled with concrete.
[0034] The circumferential water-collecting channel steel 5 is opened with a triangular opening at the entrance of the longitudinal water-collecting angle steel 4 on the downstream side in the water flow direction. The opening size is slightly smaller than the size of the longitudinal water-collecting angle steel 4, and the longitudinal water-collecting angle steel 4 and the outer surface of the circumferential water-collecting channel steel 5 are full-welded.
[0035] The joints of the wall-attached drainage main pipe 6 and the connection part between it and the circumferential water-collecting channel steel 5 are full-welded.
[0036] During the construction process, the longitudinal water-collecting angle steel 4, the circumferential water-collecting channel steel 5 and the wall-attached drainage main pipe 6 should be prevented from being blocked. The wall-attached drainage main pipe 6 is required to be 10 cm higher than the ground in the flat section to prevent mud, gravel, etc. from entering during construction and causing blockage.
[0037] Therefore, in this embodiment, the drainage system is divided into two parts: rock wall drainage and wall-attached drainage. The rock wall drainage mainly drains the water between the surrounding rock and the backfill concrete: system drainage holes 1 are drilled in the rock walls on both sides of the penstock, and hard plastic perforated pipes are inserted into the holes. The hard plastic perforated pipes extend along the rock wall surface to the bottom or the installed anchor bolts, and are connected to the rock wall drainage main pipes 3 installed on the feet of the rock walls on both sides or the anchor bolts.
[0038] The wall-attached drainage mainly drains the water between the outside of the penstock and the backfilled concrete. Specifically, a plurality of longitudinal water-collecting angle steels 4 are arranged along the water flow direction on the outside of the penstock. Several longitudinal water-collecting angle steels are arranged at the upper 180° and the lower 180° of the typical cross-section of the penstock. The longitudinal water-collecting angle steels 4 all pass through the grout holes on the stiffening ring of the penstock and are skip-welded to the outer wall of the penstock. A circumferential water-collecting channel steel 5 is arranged at intervals of several penstock sections along the penstock. Except for the lower 90° range, the channel steel is skip-welded to the penstock. The circumferential water-collecting channel steel 5 has a triangular opening at the downstream of the longitudinal water-collecting angle steel 4 and is fully welded and connected to the longitudinal water-collecting angle steel 4. A wall-attached drainage main pipe 6 is arranged in the backfilled concrete at the lower part of the penstock. The circumferential water-collecting channel steel 5 is connected to the wall-attached drainage main pipe 6 through a connecting pipe. The water collected by the rock wall drainage main pipe 3 and the wall-attached drainage main pipe 6 is discharged through the inspection drainage gallery of the construction adit or the drainage ditch of the underground powerhouse. The circumferential water-collecting channel steel 5 divides the wall-attached drainage system into zones. The longitudinal water-collecting angle steels 4 between adjacent circumferential water-collecting channel steels 5 are only connected to one side of the circumferential water-collecting channel steel 5 to avoid the drainage system failure caused by local blockage due to improper construction and other reasons. Through the above drainage system, the piezometric head on the outside of the underground penstock can be effectively reduced, and the operation stability and safety of the penstock are improved.
[0039] Embodiment 2:
[0040] The following is a detailed description in conjunction with the drawings and specific examples:
[0041] The main buildings of the water conveyance system of a pumped-storage power station include: the upper reservoir intake / outlet, the intake emergency gate shaft, the intake tunnel, the penstock (main pipe, steel bifurcation pipe, high-pressure branch pipe), the tailwater branch pipe, the tailwater emergency gate chamber, the tailwater surge shaft, the tailwater tunnel, the tailwater inspection gate shaft and the lower reservoir intake / outlet. The elevation of the intake penstock is of the double inclined shaft type, the tailwater branch pipe is straight, and the steel lining sections of the penstock (main pipe, steel bifurcation pipe and high-pressure branch pipe) and the tailwater branch pipe are lined with steel plates.
[0042] A set of drainage system is arranged in the steel lining section of the penstock. The penstock drainage system is divided into three sections, and the three sections are independent of each other and not connected. The first section: from the starting point of the steel lining to the upper intake adit, the water collected in this part is introduced into the drainage ditch of the upper intake adit; the second section: from the upper intake adit to the middle intake adit, the water collected in this part is introduced into the drainage ditch of the middle intake adit; the third section: from the middle intake adit to the upstream side wall of the powerhouse, the water collected in this part is introduced into the sump through the drainage ditch of the upstream side wall of the powerhouse.
[0043] A rock wall drainage system and a wall-attached drainage system are arranged in all three sections.
[0044] The rock wall drainage system mainly drains the water between the surrounding rock and the backfilled concrete. System drainage holes with a row spacing of 3 m are drilled at a distance of 1.5 - 2.5 m from the bottom elevation on both sides of the rock wall. The hole depth is 1.5 m, the hole diameter is 38 - 45 mm, and hard plastic pipes with an inner diameter of 32 mm are inserted into the holes. The plastic pipes extend to the ground and are connected to the DN150 galvanized steel pipes at the corners of both sides of the rock wall. If the self-flow condition is not sufficient, anchor bolts can be installed at a high position, and the DN150 main rock wall drainage pipe can be installed on the steel bars to facilitate the generation of a height difference for water drainage.
[0045] The wall-attached drainage system mainly drains the water between the outside of the steel pipe and the backfilled concrete. Four longitudinal water collection angle steels of ∠63×5 are arranged along the water flow direction on the outside of the steel pipe. Two are arranged at the lower 180° and the upper 180° of the circular cross-section of the steel pipe respectively. All four longitudinal water collection angle steels pass through the slurry leakage holes on the external stiffening ring of the steel pipe. Circumferential water collection channel steels are arranged at intervals of several pipe sections along the water conveyance steel pipe (each circular pipe section in the standard section is 3 m long). The specification of the circumferential water collection channel steel is 14a. One φ102 galvanized drainage main pipe parallel to the steel pipe direction is arranged on each side of the vertical symmetry axis within 400 mm of the 600 mm thick backfilled concrete at the lower part of the steel pipe. The water collected by the longitudinal water collection angle steels is discharged into the circumferential water collection channel steels, and the water collected by the circumferential water collection channel steels is discharged into the galvanized drainage main pipe. The DN150 main rock wall drainage pipe and the φ102 wall-attached drainage main pipe in the horizontal section and the upper horizontal section of the penstock discharge water through the construction access tunnel and the inspection drainage corridor. The water in the lower horizontal section of the penstock is discharged into the plant drainage ditch through the DN150 main rock wall drainage pipe and the φ102 wall-attached drainage main pipe.
[0046] The longitudinal water collection angle steel and the steel lining are connected by skip welding, with a length of 100 mm, a spacing of 500 mm, and a weld height of 6 mm. The non-welded parts are coated with industrial soap, pasted with non-woven fabric, and then backfilled with concrete.
[0047] The circumferential water collection channel steel is arranged between two stiffening rings. The circumferential water collection channel steel and the steel lining are connected by skip welding (full welding in the 90° range at the bottom), with a length of 100 mm, a weld spacing of 500 mm, and a welding height of 6 mm. The non-welded parts are coated with industrial soap, pasted with non-woven fabric, and then backfilled with concrete. The circumferential water collection channel steel has a triangular opening at the entrance of the longitudinal water collection angle steel on the downstream side in the water flow direction. The opening size is slightly smaller than the size of the longitudinal water collection angle steel. The longitudinal water collection angle steel and the outer surface of the circumferential water collection channel steel are fully welded, with a weld height of 6 mm.
[0048] The joints of the galvanized drainage main pipe and the connection parts between it and the circumferential water collection channel steel are welded by full welding, using fillet welds with a weld leg height of 10 mm. The drain pipes should be prevented from being blocked during the construction process. The longitudinal drainage main pipe is required to be 10 cm higher than the ground in the horizontal section to prevent mud, gravel, etc. from entering during construction and causing blockage.
[0049] The results have been applied to the construction of pumped-storage power stations, and the drainage effect is good.
[0050] The above are only the preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present utility model, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present utility model.
Claims
1. A pressure steel pipe external drainage structure, characterized in that: The invention comprises a rock wall drainage structure and a wall-attached drainage structure; the rock wall drainage structure comprises a system drainage hole (1), a rock wall drainage main pipe (3) and a rock wall drainage branch pipe (11); a plurality of the rock wall drainage main pipes (3) are distributed along the hole axis direction at the bottom of the rock wall; a plurality of the system drainage holes (1) are arranged on the surface of the rock wall; one end of the rock wall drainage branch pipe (11) is inserted into each of the system drainage holes (1), and the other end of the rock wall drainage branch pipe (11) extends downward along the rock wall and is connected to the rock wall drainage main pipe (3); The wall-attached drainage structure comprises a wall-attached water collection unit and a wall-attached drainage main pipe (6); a plurality of the wall-attached water collection units are arranged on the outer surface of the steel pipe lining (7) along the water flow direction; each of the wall-attached water collection units comprises a longitudinal water collection angle steel (4) and an annular water collection channel steel (5); the longitudinal water collection angle steel (4) is arranged on the outer peripheral surface of the steel pipe lining (7) along the water flow direction; the annular water collection channel steel (5) is installed at the downstream end of each of the longitudinal water collection angle steels (4); the annular water collection channel steel (5) is fixedly sleeved on the outer periphery of the steel pipe lining (7); the wall-attached drainage main pipe (6) is arranged in the backfill concrete (8) below the steel pipe lining (7) along the axial direction of the hole, and the bottom of the annular water collection channel steel (5) is connected to the wall-attached drainage main pipe (6).
2. The external drainage structure of a pressure steel pipe according to claim 1, characterized in that: A dowel bar or anchor rod (2) is arranged below the rock wall drainage main pipe (3), and the dowel bar or anchor rod (2) supports the rock wall drainage main pipe (3).
3. The external drainage structure of a pressure steel pipe according to claim 1, characterized in that: The rock wall drainage branch pipe (11) is a hard plastic flower pipe.
4. The external drainage structure of a pressure steel pipe according to claim 1, characterized in that: The rock wall drainage main pipe (3) and the wall-attached drainage main pipe (6) are both galvanized pipes.
5. The external drainage structure of a pressure steel pipe according to claim 1, characterized in that: The bottom of the annular water collecting trough steel (5) is connected to the wall-attached drainage main pipe (6) via a connecting pipe (12).
6. The external drainage structure of a pressure steel pipe according to claim 1, characterized in that: The connection parts of the longitudinal water collection angle steel (4) and the steel pipe lining (7) are fixed by jump welding; the non-welding parts are sealed with industrial soap and affixed with non-woven fabric.
7. The external drainage structure of a pressure steel pipe according to claim 1, characterized in that: The annular water collecting trough steel (5) is arranged between two stiffening rings (9) on the surface of the steel pipe lining (7); the connection parts of the annular water collecting trough steel (5) and the steel pipe lining (7) are fixed by jump welding; the non-welded parts are sealed with industrial soap and pasted with non-woven fabric.
8. The external drainage structure of a pressure steel pipe according to claim 1, characterized in that: The annular water collecting channel steel (5) has a triangular opening at the entry point of the longitudinal water collecting angle steel (4) on the downstream side of the water flow direction, and the opening size is smaller than the size of the longitudinal water collecting angle steel (4); the longitudinal water collecting angle steel (4) and the annular water collecting channel steel (5) are fully welded on the outer surface at the connection position.
9. The external drainage structure of a pressure steel pipe according to claim 1, characterized in that: The joints of the wall-attached drainage main pipe (6) and the connection portions with the annular water collecting trough steel (5) are fully welded.
10. The external drainage structure of a pressure steel pipe according to claim 1, characterized in that: The wall-attached drainage main pipe (6) is 10 cm above the ground in the flat section.