An underwater slope water intake steel pipe installation structure for a hydraulic tunnel and a construction method thereof

Abstract

The application provides a water diversion steel pipe installation structure for underwater bank slope of a hydraulic tunnel, the water diversion steel pipe comprises horizontal section pipe sections and water diversion pipe sections arranged in steps, the horizontal section pipe sections are connected with valves arranged in the tunnel, meanwhile, the tunnel is blocked by concrete plugs for the horizontal section pipe sections to extend out; the water diversion pipe sections are arranged along the bank slope and extend into underwater specified elevations; a temporary cofferdam is arranged behind the horizontal section pipe sections outside the bank slope in a detachable mode, the temporary cofferdam is higher than the reservoir water level, so that the horizontal section pipe sections are fixed on the bank slope and connected with the water diversion pipe sections in the later period. The application solves the problem that the traditional water diversion steel pipe installation for the bank slope of the hydraulic tunnel is greatly affected by the water level, and can realize underwater installation of the steel pipe under high water level, the operation method is simple, the working time of divers under water can be reduced, and the construction efficiency of underwater installation is effectively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water conservancy and hydropower engineering, and particularly relates to a water conservancy tunnel underwater bank slope water taking steel pipe installation structure and a construction method. BACKGROUND

[0002] At present, it has become an important development trend to build data centers near reservoirs and hydropower stations, which can not only rely on hydropower stations to provide reliable power sources, but also take deep cooling water from reservoirs as water cooling medium to cool equipment, greatly reducing the energy consumption of the refrigeration system and improving the overall energy efficiency of the system. Taking deep cooling water from the reservoir requires the construction of a water conservancy tunnel and the laying of a water taking steel pipe on the reservoir bank slope. In order to ensure the water temperature and the water taking guarantee rate, the water taking depth is often set at a water depth of 40m below the dead water level of the reservoir, so the water taking steel pipe needs to be extended to a specified elevation underwater.

[0003] In actual construction process, due to the limitation of reservoir water level regulation and power generation of hydropower stations, it is difficult to adjust to ideal water level conditions, and the water level coordination period is long and the procedure is complex. If only relying on the coordinated water level construction, it will have a greater impact on the project period. And in the case of high reservoir water level, the blasting penetration of the water conservancy tunnel and the butt joint of the horizontal section steel pipe and the underwater steel pipe cannot create dry land construction and butt joint conditions. Therefore, it is necessary to design a water conservancy tunnel bank slope water taking steel pipe underwater installation structure and method, which can not only ensure the installation of the water taking steel pipe under the condition that the reservoir water level cannot be lowered, but also facilitate underwater butt joint and overall installation, improve construction efficiency and shorten the construction period. SUMMARY

[0004] The first object of the present application is to provide an installation structure that can meet the demand of underwater water taking steel pipe installation without lowering the reservoir water level under high water level conditions, and is convenient to install. To this end, the present application adopts the following technical scheme:

[0005] A water conservancy tunnel underwater bank slope water taking steel pipe installation structure, the water taking steel pipe includes a horizontal section pipe section and a water taking pipe section arranged in steps, the horizontal section pipe section is connected with a valve arranged in the tunnel, and at the same time, the tunnel sealing is provided with a concrete plug head for the horizontal section pipe section to extend out; the water taking pipe section is arranged along the bank slope and extends into a specified elevation underwater; a temporary cofferdam is arranged behind the horizontal section pipe section outside the bank slope in a detachable manner, the temporary cofferdam is higher than the reservoir water level, so that a dry land construction area for the horizontal section pipe section is formed in the surrounding area of the temporary cofferdam, so that the horizontal section pipe section is fixed on the bank slope and connected with the water taking pipe section in the later period, and an intermediate section is arranged outside the concrete plug head of the horizontal section pipe section, the intermediate section includes a replaceable short pipe in a closed pipe or an expansion joint in a pipe flow type, and the expansion joint is in a detachable replacement construction control state of the replaceable short pipe.

[0006] Furthermore: the water intake pipe section includes an inclined pipe that is inclined in the same direction as the bank slope; a water intake head is provided at the end of the water intake pipe section that extends into the water at a specified elevation; a first bend is provided between the inclined pipe and the water intake head; and a second bend is provided between the end of the horizontal section extending outward from the tunnel and the inclined pipe.

[0007] Furthermore, the water intake head is equipped with an underwater support platform connected to it, and the underwater support platform is equipped with anchor piles fixed to the bank slope.

[0008] Furthermore, a retaining wall connected to the inclined pipe is provided on the bank slope.

[0009] Furthermore, the expansion joint has the same length as the replacement short tube.

[0010] Furthermore, the internal partition of the replacement short tube is equipped with a blind plate.

[0011] Furthermore: the horizontal pipe segment includes a first horizontal pipe disposed outside the tunnel, a second horizontal pipe disposed inside the tunnel, one end of the second horizontal pipe extending out of the concrete plug, and the first horizontal pipe and the second horizontal pipe being connected or communicating through the intermediate pipe.

[0012] Furthermore, a bolster beam is provided on the outside of the first horizontal pipe so that the first horizontal pipe is fixed to the bank slope by the bolster beam.

[0013] The second objective of this invention is to provide a construction method that facilitates underwater docking and overall installation, thereby improving construction efficiency and shortening the construction period. To this end, this invention adopts the following technical solution:

[0014] A construction method for installing a steel pipe for water intake on the underwater bank slope of a hydraulic tunnel;

[0015] The entire water intake steel pipe is pre-divided into a first section and a second section on the shore. The horizontal section forms the first section when the replacement short pipe is used in the middle section. The water intake pipe section is connected to the underwater support platform to form the second section.

[0016] The first segment and the second segment are hoisted together as a whole, and after the first horizontal pipe is connected to the second bend pipe, the replacement short pipe is replaced with the expansion joint.

[0017] Furthermore, it includes the following steps:

[0018] S1: Construct the temporary cofferdam at the junction of the first horizontal pipe and the inclined pipe;

[0019] S2: Drain the water from the temporary cofferdam and use a crane to install and fix the first segment as a whole according to the layout position;

[0020] S3: Concrete is poured outside the first horizontal pipe section to enclose it, forming the sleeper beam;

[0021] S4: After the concrete strength of the bolster beam reaches the design value, the temporary cofferdam is removed, exposing the end of the first horizontal pipe;

[0022] S5: The second section is lifted as a whole by a floating crane and placed on the bank slope at the set position, and the first horizontal pipe and the inclined pipe are connected.

[0023] S6: Connect the underwater support platform to the bank slope through the anchor piles, and pour the anchor pier to connect the inclined pipe to the bank slope;

[0024] S7: Pour the concrete plug inside the tunnel and install the valve. Replace the expansion joint after the valve is closed.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] This invention solves the problem of the significant impact of water level on the installation of water intake steel pipes on the bank slope of hydraulic tunnels using traditional techniques. It enables underwater installation of steel pipes even at high water levels, with a simple operation method that reduces the time divers spend underwater, effectively improving construction efficiency. Furthermore, it allows for phased and segmented installation, creating suitable underwater working conditions. The replacement of short pipes via expansion joints reduces the difficulty of controlling the water level in the hydropower station's regulating reservoir, effectively controlling the project schedule. Simultaneously, the establishment of temporary cofferdams creates dry-land construction conditions for the first horizontal pipe and the replacement short pipe, facilitating precise adjustment of the steel pipe's position and angle, providing guidance for underwater docking, and simplifying underwater docking and installation. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 This is a schematic diagram of the structure of the first segment of the present invention;

[0029] Figure 3 This is a schematic diagram of the structure of the second segment of the present invention;

[0030] Figure 4 This is a schematic diagram of the overall structure of the present invention;

[0031] Figure 5 This is a schematic diagram of the overall structure of the present invention.

[0032] The markings in the attached diagram are as follows: 1. Underwater support platform; 2. Anchor pile; 3. Water intake head; 4. First bend pipe; 5. Inclined pipe; 6. Pier; 7. Second bend pipe; 8. First horizontal pipe; 9. Pillar beam; 10. Replacement short pipe; 11. Expansion joint; 12. Flange; 13. Second horizontal pipe; 14. Steel pipe valve; 15. Temporary cofferdam; 16. Blind flange; 17. Concrete plug; 18. Tunnel; 19. Bank slope. Detailed Implementation

[0033] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0034] like Figures 1-5 As shown, an underwater bank slope water intake steel pipe installation structure for a hydraulic tunnel includes a stepped horizontal pipe section and a water intake pipe section. The horizontal pipe section is connected to a valve 14 installed inside the tunnel 18. The tunnel 18 is sealed with a concrete plug 17 that allows only the horizontal pipe section to extend. The water intake pipe section is arranged along the bank slope 19 and extends into the water to a designated elevation. A temporary cofferdam 15 is installed on the bank slope 19 outside the horizontal pipe section to fix the horizontal pipe section on the bank slope 19 and connect it to the water intake pipe section later. The elevation of the temporary cofferdam 15 is higher than the reservoir water level, so that the area enclosed by the temporary cofferdam 15 forms a dry construction area for the horizontal pipe section. An intermediate section is set outside the concrete plug 17 of the horizontal pipe section. The intermediate section includes a closed replacement short pipe 10 or a flow-through expansion joint 11. The expansion joint 11 allows for the detachable and replaceable construction control of the replacement short pipe 10.

[0035] In this embodiment, a temporary cofferdam 15 is set between the second bend 7 and the first horizontal pipe 8. The dry construction area formed by the temporary cofferdam 15 provides the first horizontal pipe 8 and the replacement short pipe 10 with dry construction conditions similar to those on land, which facilitates more precise adjustment of the position and angle of the horizontal pipe section steel pipe and provides guidance for the subsequent underwater docking of the water intake pipe section steel pipe, thereby making underwater docking and installation construction easier.

[0036] Meanwhile, by replacing the short pipe 10 and the expansion joint 11, the flow of water in the tunnel 18 can be controlled, so that the underwater installation and construction needs can be met without lowering the reservoir water level under high water conditions.

[0037] Specifically, at the locations of the replacement short pipe 10 and expansion joint 11 in the middle section, a groove is preferably opened in the area of ​​the bank slope 19 to facilitate subsequent replacement.

[0038] like Figures 1-3As shown, specifically, the water intake pipe section includes an inclined pipe 5 that is inclined in the same direction as the bank slope 19; a water intake head 3 is provided at the end of the water intake pipe section that extends into the water to a specified elevation; a first bend pipe 4 is provided between the inclined pipe 5 and the water intake head 3; and a second bend pipe 7 is provided between the end of the horizontal section extending outward from the tunnel 18 and the inclined pipe 5.

[0039] In this embodiment, all pipes can be connected and disassembled / replaced using flanges 12, which facilitates the maintenance of the water intake steel pipes during later operation. Specifically, the inclined pipe 5 is connected to the first bend pipe 4 and the second bend pipe 7 via flanges 12, and the water intake head 3 is also connected to the first bend pipe 4, and the first horizontal pipe 8 is connected to the second bend pipe 7 via flanges.

[0040] The water intake head 3 is equipped with an underwater support platform 1 connected to it, and anchor piles 2 fixed to the bank slope 19 are installed on the underwater support platform 1. The anchor piles 2 are drilled into the rock and cast with epoxy concrete.

[0041] In this embodiment, before installation, the water intake pipe section is pre-set on the shore to form a segment, thereby forming a whole that is easy to construct and hoist. This allows the inclined pipe 5, water intake head 3, and underwater support platform 1 to be spliced ​​together on the shore as a whole for hoisting, reducing the difficulty of underwater docking and improving construction efficiency.

[0042] Among them, anchor blocks 6 are set on the bank slope 19 and connected to the inclined pipe 5. The anchor blocks 6 are poured at the position where the inclined pipe 5 is close to the bank slope 19, and multiple anchor blocks 6 can be poured. The anchor blocks 6 are made of anchor rods and concrete.

[0043] like Figures 4-5 As shown, specifically, the expansion joint 11 and the replacement short pipe 10 have the same length. Furthermore, both ends of the replacement short pipe 10 and the expansion joint 11 are also equipped with flanges 12 for connection with the first horizontal pipe 8 and the second horizontal pipe 13.

[0044] like Figure 4 As shown, a steel blind plate 16 is provided on one side of the interior of the replacement short pipe 10 to seal the interior of the replacement short pipe 10 and form a blind end.

[0045] like Figure 1 , 3 As shown, specifically, the horizontal section includes a first horizontal pipe 8 installed outside the tunnel 18, a second horizontal pipe 13 installed inside the tunnel 18, one end of the second horizontal pipe 13 extending out of a concrete plug 17, and the first horizontal pipe 8 and the second horizontal pipe 13 connected or communicated through an intermediate pipe.

[0046] The first horizontal pipe 8 is externally fitted with a bolster beam 9 to secure it to the bank slope 19. The bolster beam 9 is constructed of anchor bolts and cast concrete. By pre-fixing the first horizontal pipe 8 and the bank slope 19 together in the dry construction area, the bolster beam 9 ensures the stability of the first horizontal pipe 8 underwater even after the temporary cofferdam 15 is removed.

[0047] In this embodiment, the water intake steel pipe is securely connected to the bank slope 19 by setting anchor piles 2, anchor blocks 6, and sleeper beams 9, so as to avoid the water flow disturbance causing the water intake steel pipe to shift, and to ensure the stability of the water intake steel pipe on the bank slope 19 during the water intake process.

[0048] Please see Figures 1-5 The specific construction steps for installing the water intake steel pipe on the underwater bank slope of a hydraulic tunnel are as follows:

[0049] S1: Dimensioning: Lay out the length of the first horizontal pipe (8), the length of the inclined pipe (5), the length of the water intake head (3), the length of the replacement short pipe (10), and the length of the second horizontal pipe (13) on site according to the drawings.

[0050] S2: Construct a temporary cofferdam 15: Construct a temporary cofferdam 15 at the junction of the first horizontal pipe 8 and the inclined pipe 5 to prevent reservoir water from flowing into the temporary cofferdam 15.

[0051] S3: Assembly of underwater support platform 1: Fabricate the platform frame according to the required platform size, and install the connection methods of each structure in the underwater support platform 1 device on shore;

[0052] S4: Water intake steel pipe connection: The first horizontal pipe 8 is connected to the replacement short pipe 10 and the second horizontal pipe 13 flange to form the first section, and the inclined pipe 5 is connected to the water intake head 3 and the underwater support platform 1 to form the second section.

[0053] S5: First segment installation: Drain the water inside the temporary cofferdam 15 and use a crane to install and fix the first segment as a whole according to the layout position;

[0054] S6: Casting the sleeper beam 9: Casting concrete around the first horizontal pipe 8 section to form the sleeper beam 9;

[0055] S7: Temporary cofferdam 15 removal: After the concrete strength of the sleeper beam 9 reaches the design value, the temporary cofferdam 15 will be removed using an excavator to expose the end of the first horizontal pipe 8.

[0056] S8: Second section underwater hoisting: The second section is hoisted as a whole by a floating crane and placed on the bank slope 19 according to the set position. Divers then connect the first horizontal pipe 8 and the inclined pipe 5 to the flange 12 through the first bend pipe 4 to form a connection.

[0057] S9: Anchoring of anchor pile 2: In order to stabilize the underwater support platform 1 of the bank slope, an anchor hole is drilled in the steel pipe pile of the underwater support platform 1 and an anchor rod is placed. The anchor rod and the steel pipe pile are filled with high-strength concrete mortar.

[0058] S10: Casting anchor block 6: Cast concrete anchor block 6 along the position where the inclined pipe 5 is close to the bank slope 19, and connect the inclined pipe 5 and the bank slope 19 through anchor block 6.

[0059] S11: Concrete plug 17 pouring and valve 14 installation: Concrete plug 17 is poured inside tunnel 18, and valve 14 is installed inside tunnel 18.

[0060] S12: Replacement of expansion joint 11: After valve 14 is closed, the diver replaces the replacement short pipe 10 with expansion joint 11 underwater.

[0061] The above embodiments are merely preferred technical solutions of the present invention. Those skilled in the art should understand that modifications or substitutions to the technical solutions or parameters in the embodiments can be made without departing from the principles and essence of the present invention, and all such modifications or substitutions should be covered within the protection scope of the present invention.

Claims

1. A construction method for an underwater bank slope water intake steel pipe installation structure in a hydraulic tunnel, characterized in that: The water intake steel pipe includes a stepped horizontal pipe section and a water intake pipe section. The horizontal pipe section is connected to a valve (14) installed in the tunnel (18). The tunnel (18) is sealed with a concrete plug (17) that allows only the horizontal pipe section to extend out. The water intake pipe section is arranged along the bank slope (19) and extends into the water to a specified elevation. The bank slope (19) is equipped with a temporary cofferdam (15) outside the horizontal section of the pipe. The elevation of the temporary cofferdam (15) is higher than the reservoir water level, so that the area enclosed by the temporary cofferdam (15) forms a dry construction area for the horizontal section of the pipe, so that the horizontal section of the pipe can be fixed on the bank slope (19) and connected to the water intake pipe in the later stage. The horizontal section of the pipe is provided with an intermediate section outside the concrete plug (17). The intermediate section includes a closed replacement short pipe (10) or a flow-through expansion joint (11). The expansion joint (11) is in a detachable and replaceable construction control state for the replacement short pipe (10). The horizontal pipe section includes a first horizontal pipe (8) disposed outside the tunnel (18), and a second horizontal pipe (13) disposed inside the tunnel (18). One end of the second horizontal pipe (13) extends out of the concrete plug (17), and the first horizontal pipe (8) and the second horizontal pipe (13) are connected or communicated through an intermediate pipe. The water intake pipe section includes an inclined pipe (5) that is inclined in the same direction as the bank slope (19); a water intake head (3) is provided at the end of the water intake pipe section that extends into the water at a specified elevation; a first bend (4) is provided between the inclined pipe (5) and the water intake head (3); and a second bend (7) is provided between the end of the horizontal section extending outward from the tunnel (18) and the inclined pipe (5). The water intake head (3) is provided with an underwater support platform (1) connected to it, and an anchor pile (2) fixed to the bank slope (19) is provided on the underwater support platform (1). A pier (6) connected to the inclined pipe (5) is provided on the bank slope (19). The first horizontal pipe (8) is provided with a pillow beam (9) on the outside so that the first horizontal pipe (8) is fixed on the bank slope (19) by the pillow beam (9); The entire water intake steel pipe is pre-divided into a first section and a second section on the shore. The horizontal section is formed by the replacement short pipe (10) in the middle section. The water intake pipe is connected to the underwater support platform (1) to form the second section. The first segment and the second segment are hoisted together in sequence, and after the first horizontal pipe (8) is connected to the second bend pipe (7), the replacement short pipe (10) is replaced with the expansion joint (11).

2. The construction method for the installation structure of a water intake steel pipe on an underwater bank slope of a hydraulic tunnel according to claim 1, characterized in that: The expansion joint (11) has the same length as the replacement short tube (10).

3. The construction method for the installation structure of a water intake steel pipe on an underwater bank slope of a hydraulic tunnel according to claim 1, characterized in that: The replacement short tube (10) is equipped with a blind plate (16) inside the partition.

4. The construction method for the installation structure of a water intake steel pipe on an underwater bank slope of a hydraulic tunnel according to claim 1, characterized in that: Its construction method includes the following steps: S1: Construct the temporary cofferdam (15) at the junction of the first horizontal pipe (8) and the inclined pipe (5). S2: Drain the water in the temporary cofferdam (15) and use a crane to install and fix the first segment as a whole according to the layout position; S3: Concrete is poured outside the first horizontal pipe (8) segment to form the sleeper beam (9). S4: After the concrete strength of the pillow beam (9) reaches the design value, the temporary cofferdam (15) is removed to expose the end of the first horizontal pipe (8); S5: The second section is lifted as a whole by a floating crane and placed on the bank slope (19) at the set position, and the first horizontal pipe (8) and the inclined pipe (5) are connected. S6: The underwater support platform (1) is connected to the bank slope (19) by the anchor pile (2), and the anchor pier (6) is poured to connect the inclined pipe (5) to the bank slope (19); S7: Pour the concrete plug (17) into the tunnel (18) and install the valve (14). Replace the expansion joint (11) after the valve (14) is closed.

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