CN106677257A - Installation process of sinking pipe for offshore water intake and discharge in power plant - Google Patents

Abstract

The invention discloses an installation process of an immersed tube for water intake and drainage in a power plant. Immersed tube positioning, sinking and docking of immersed tubes, tight pulling, removal of steel buoyancy tanks, removal of measuring towers, front section jacks and installation of gussets. In the installation process of the immersed tube for water intake and drainage of the power plant in the present invention, the immersed tube is installed with the aid of a steel box for buoyancy, which solves the problem of insufficient buoyancy of the immersed tube itself; it can ensure that the installation accuracy of the immersed tube meets the requirements of the design and specifications by removing the steel buoyant tank The optimization of the process can effectively protect the foundation bed of the next section of the immersed tube, and can also reduce the project cost and shorten the construction period.

Description

An installation process of immersed pipes for offshore intake and drainage of power plants

technical field

The invention relates to an installation process of a submerged pipe for taking water out of the sea of a power plant.

Background technique

With the continuous development of economy and society, electricity consumption is also increasing rapidly. In order to meet people's production and living electricity demand, the main way is to rebuild, expand and increase the capacity of power plants, many of which are thermal power plants and nuclear power plants. Both thermal power generation and nuclear power generation need to cool the power generation equipment, which requires a large amount of cooling water. Therefore, most large-scale nuclear power plants and thermal power plants are located close to bays, estuaries, lakes, reservoirs, etc., so as to use water resources to achieve cooling on the spot. The intake and drainage immersed tube engineering is one of the important factors that determine the thermal efficiency of power plants. The installation and construction of intake and drainage immersed pipes is difficult, which is reflected in the following aspects:

1) The foundation of the immersed tube adopts the structural form of the crushed stone bed. During the dismantling of the steel buoyancy tank, it is easy to cause damage to the crushed stone bed of the next section of the immersed tube;

2) The prefabricated immersed tube is bulky and heavy, and the immersed tube itself does not have a closed space, and the buoyancy provided by itself is small;

3) The design requires that the installation accuracy of the immersed tube be controlled within 2cm, requiring extremely high accuracy;

4) The number of immersed tubes is large, the installation line is long, and the precision control of the installation plane position of the immersed tube is high. If the control is not in place, it is easy to cause a large cumulative error.

Contents of the invention

The purpose of the present invention is to overcome the defects of the prior art and provide an installation process of the immersed pipe for the offshore intake and drainage of the power plant, which can ensure that the installation accuracy of the immersed pipe meets the design and specification requirements, and can also reduce the project cost and shorten the construction period.

The object of the present invention is achieved in this way: an installation process of immersed tubes for water intake and drainage in a power plant, comprising the following steps: prefabrication of immersed tubes, barge on immersed tubes, semi-submerged barge transportation, installation of steel buoyancy tanks, submersion of semi-submersible barges, Immersed tube hoisting, immersed tube positioning, immersed tube sinking and docking, pulling tight, removing steel buoyancy tank, removing measuring tower, front section jack and installing buckle plate; among them,

When carrying out the immersed tube prefabrication step, it is to prefabricate multi-section water intake immersed tubes, two water intake head caissons, multi-section drainage immersed tubes and three outfall head immersed tubes at the prefabrication yard wharf; The direction of the prefabricated parts is compiled from small to large, so that the intake and drainage immersed pipes can be installed alternately from the shore side to the sea side;

When carrying out the barge step of the immersed tube, the prefabricated immersed tube is installed on the semi-submersible barge, the immersed tube is placed at the bow of the semi-submersible barge, and only one section of the immersed tube is installed each time;

When carrying out the semi-submerged barge transportation step, the semi-submersible barge with one section of immersed tube is towed from the prefabricated yard wharf to the submerged pit by the tugboat. Facing the shore, and then throw the figure-of-eight anchor in place through the four corners;

When carrying out the step of installing the steel pontoon, the lifting ship is first in place, and then the measuring GPS and the pulling jack are installed, and then the steel buoy is installed by the lifting ship; when the lifting ship is in place, the lifting ship and the semi-submersible barge Coaxially stop at the bow of the semi-submersible barge and place the figure-of-eight anchors through the four corners; when installing the measurement GPS, place the measurement GPS on the top of the measurement tower, connect it to the computer of the crane ship through a wireless signal, and then Place the measuring tower on the embedded part of the immersed tube and fix it on the embedded part through flange bolts; a measuring tower should be installed at the head and tail of the central axis of the immersed tube; the pulling jack is installed at the head of the immersed tube When installing the steel buoyant box, the steel buoyant box is placed on the flat barge, and the flat barge is docked on one side of the semi-submersible barge after it is in place; the crane ship lifts the steel buoyant box from the flat barge to the On the semi-submersible barge, the steel buoyant box is inserted into each channel of the immersed tube by moving the ship forward and backward and pulling by the hoist on the semi-submersible barge;

When carrying out the diving step of the semi-submersible barge, after the installation of the steel buoyancy tank is completed, the semi-submersible barge dives with water injection, and when the upper surface of the top plate of the immersed tube is slightly higher than the water surface, the lifting ship moves forward first, Make the lifting bar extend from between the bow towers of the semi-submersible barge to 1/2 of the total length of the immersed tube of the semi-submersible barge, and stop when the vertical line of the main hook of the lifting ship coincides with the center of the immersed tube Move the ship, put down the main hook, hang the suspension cable, and then the semi-submersible barge continues to dive until the top of the immersed tube is immersed in the water surface for about 1m and stops diving;

During the hoisting step of the immersed tube, the crane ship moves backward to lift the immersed tube away from the semi-submersible barge. During the hoisting process, keep the top surface of the immersed tube 1m below the water surface, and then tighten the anchor to move the ship position. Make the barge withdraw from the semi-submersible barge, then the semi-submersible barge floats up with water and the cable is moved out of the submerged pit, and then moved out of the channel position, then the crane ship moves to the installation position, the anchor is dropped and the cable is placed in place, and finally the semi-submersible barge is towed back by the tugboat The wharf of the prefabrication yard, carrying out barging, transportation and diving of the lower section of the immersed tube;

When performing the step of positioning the immersed tube, it includes the positioning of the crane ship and the initial positioning of the immersed tube in sequence;

When positioning the crane ship, the crane ship hangs the immersed tube into the range of the foundation groove and then stops the ship and anchors. Refer to the measurement tower reserved at the end of the immersed tube in the previous section as the benchmarking standard, and move the position of the ship by retracting and releasing the cables. When the crane ship When the immersed tube is hoisted to 10m away from the immersed tube at the front section, stop moving the ship and precisely adjust the position of the ship to prepare for the installation of the immersed tube;

When performing the initial positioning of the immersed tube, the computer of the crane ship receives the GPS signal from the top of the immersed tube through wireless signals, reflects the precise position of the immersed tube on the positioning software, and the surveyor feeds back the information to the captain, who then directs the hoist The operator twisted the cable for initial positioning, so that the axis of the immersed tube was basically aligned with the installation axis, and stopped moving the ship when the immersed tube slowly approached and was 1m away from the immersed tube of the front section;

When performing the sinking and docking step of the immersed tube, it includes the underwater docking of the drainage immersed tube and the underwater docking of the water intake immersed tube;

When carrying out the underwater docking of the drainage immersed tube, first slowly approach the drainage immersed tube to be installed to the front section of the drainage immersed tube, at this time, keep the to-be-installed drainage immersed tube 1m higher than the front section of the drainage immersed tube until the to-be-installed drainage immersed tube is 1m higher than the front section When the drainage sinking tube is less than 50cm, move the draining sinking tube to be installed slowly to the left and close to the guide member until it touches the guide member and stop moving to the left. Stop lowering at the same time, and then slowly move the drain sinking tube forward until it is close to the front drain sinking tube;

When carrying out the underwater docking of the water intake immersed tube, the horizontal and vertical positions of the docking are controlled by the measuring tower. Stop moving, and adjust the axis position and elevation of the immersed pipe to be installed to be consistent with the immersed pipe in the front section, and then move the crane ship forward until the immersed pipe to be installed is close to the immersed pipe in the front section;

When carrying out the pulling and tightening step, the divers go into the water to carry out the pulling and closing operation of the immersed tube. The pulling jack is connected to the lifting point at the tail of the immersed tube in the front section through a wire rope and a shackle. After the connection is completed, the oil pump on the working ship starts to supply oil, and the jack The pull rod is recovered, and the immersed tube starts to be pulled together until the joint between the two sections of the immersed tube is less than 2cm. Finally, the lifting boat releases the hook, and then the diver removes the shackle on the lifting point of the immersed tube underwater;

When carrying out the step of removing the steel buoyant tank, it includes the water injection and sinking of the steel buoyant tank, the pulling out of the steel buoyant tank, the water discharge of the steel buoyant tank and the recycling of the steel buoyant tank;

When the steel pontoon tank is sinking with water, in order to accurately control the water injection volume of the steel pontoon tank, foam has been installed in the inner cavity when the steel pontoon tank is manufactured;

When pulling out the steel pontoon, after the steel pontoon sinks to the bottom plate of the immersed tube, the diver connects the core-pulling anchor cable of the crane ship to the head ring of the steel pontoon through a shackle, and the crane ship indirectly Tighten the cable and try to pull the steel buoy box. If you find any obstruction during the test pull, immediately loosen the cable and move the ship back until the steel buoy box moves smoothly during the test pull, then you can continue to pull the steel buoy box out of the immersed tube;

When the steel pontoon is out of water, after the steel pontoon is pulled out of the immersed tube, the lifting hook is lowered by the crane, and the diver changes the cable underwater, and the hook is hung on the top four rings of the steel pontoon. And open the water outlet valve at the tail of the steel buoy to drain water. After the hook mooring is completed, the crane ship tightens the suspension cable and slowly lifts the steel buoy out of the water;

When the buoyant tank is recovered, after the steel buoyant tank is hoisted out of the water and the steel buoyant tank is drained, the steel buoyant tank is hoisted by the crane to the flat barge for storage, and the inlet and outlet valves on the steel buoyant tank are closed. Waiting for the installation of the next immersed tube;

When carrying out the steps of removing the measurement tower, the front section jack and installing the gusset plate, the divers underwater remove the measurement tower at the shore side and the jack on the front section of the immersed tube and lift them out of the water, and then install the gusset plate to complete the installation of this section of immersed tube Installation works.

The installation process of the above-mentioned immersed pipe for water intake and drainage of the power plant, wherein, when installing the water intake pipe, it also includes the step of joint grouting after the steps of removing the measuring tower, the front section jack and installing the gusset plate, that is, the cement slurry is passed through the pressure pump. The grouting pipe reserved at the joint of the two immersed tubes is injected into the gap between the two rings of the water stop of the two immersed tubes for water intake.

The installation process of the above-mentioned immersed tubes for water intake and drainage in the power plant, wherein, when performing the immersed tube prefabrication step, the prefabricated number of immersed tubes for water intake is 20 sections, and the immersed tubes for water intake of the first section to the thirteen sections of immersed tubes for water intake are Double-hole co-wall pipe, the cross-section of each hole is rectangular; the fourteenth section of the sinking pipe is a double-hole co-wall pipe transition to two single-hole pipes, and the cross-section of each hole is also rectangular; the fifteenth section of water sinking The tube to the twentieth section of the sinking tube for water intake are all single-hole tubes, and the cross-section of the hole is rectangular; One end of the connection between the pipe and the water intake immersed pipe in Section 16 is straight, and the other end is inclined; both ends of the immersed water intake pipe in Section 19 and the immersed water intake pipe in Section 20 are inclined; The head caisson is in the shape of a cylinder, and a circle of water inlet windows supported and separated by reinforced concrete pillars is opened along the circumference. Each water inlet window is equipped with a water inlet grille; Columns are set at the intersections of beams.

The installation process of the above-mentioned immersed tubes for the offshore intake and drainage of the power plant, wherein, when performing the immersed tube prefabrication step, the prefabricated number of the drain immersed tubes is 64 sections; the first section of drainage immersed tubes to the fifty-first section of drainage The immersed tubes are all three-hole tubes, and the cross-section of each hole is rectangular; the fifty-second drainage immersed tube is a transition from three-hole co-wall tubes to three single-hole tubes, and the cross-section of each hole is rectangular; The immersed pipes from Section 64 to Section 64 are all single-hole pipes with a rectangular cross-section; Decrease gradually along the direction of water flow, three rectangular rhinoceros heads are arranged on the top of the immersed pipe at the head of the drain, and a drainage window is respectively arranged around each rhinoceros head.

The installation process of the above-mentioned immersed pipe for water intake and drainage at sea in a power plant, wherein, during the transportation step of the semi-submersible barge, the submerged pit for the immersed pipe for water intake is set on the extension line of the installation axis of the immersed pipe for water intake and is at a distance from the first section of the immersed tube for water intake. The installation position of the pipe is 466m; there are two submerged pits for the drainage immersed pipe. The location is 774m, and the submerged pit of the second drainage immersed pipe is set at the foundation groove of the immersed pipe at the head of the outfall.

The installation process of the above-mentioned immersed tube for water intake and drainage of the power plant, wherein, when performing the installation step of the steel buoyant tank, in addition to plugging the steel buoyant tank into the channel of the immersed tube, an externally bound steel buoyant tank is also used, that is, the steel buoyant tank is installed by the crane ship. Hang the steel pontoon to the two sides or the top of the immersed tube and tie the bundled steel wire rope. The bundled steel wire rope is set loosely in the pull rings on both sides of the immersed tube and the outer positioning ring of the steel pontoon. When the immersed tube dives into the water , the steel buoyant tank floats up, and the bundled steel wire rope is naturally tightened. When the steel buoyant tank floats up to the top surface and is flush with the top surface of the immersed tube, the semi-submersible barge suspends diving. The thin wire rope is tightened and the end of the wire rope is tied to the pre-buried pull ring in the middle of the roof of the immersed tube, so that the steel box is close to the side wall of the immersed tube, and then the semi-submersible barge continues to dive until the top surface of the immersed tube is submerged. The water surface is 1m.

In the installation process of the above-mentioned immersed pipe for the offshore intake and drainage of the power plant, when performing the step of diving the semi-submersible barge, preparations before diving must first be carried out, including the periods of sea sweeping, selection of diving and hoisting and installation.

The installation process of the sinking pipe for the offshore intake and drainage of the power plant of the present invention has the following characteristics:

1) Strengthen the quality control of immersed tube prefabrication and immersed tube foundation construction quality control to ensure that the installation accuracy of immersed tube meets the design and specification requirements;

2) Strictly control the prefabrication quality of the joints of the water intake immersed pipes. Before the installation in the water, carry out matching measurements on the male and female joints of all the water intake immersed pipes on the site, and grind and adjust the male and female joints that do not meet the size requirements. During installation, the joint width is strictly controlled according to the design requirements, and the grouting pressure is strictly controlled during the joint grouting process to ensure that the joints are densely grouted;

3) At the beginning of the installation, strictly control the installation plane position of the first immersed tube. During the subsequent construction, record and analyze the installation plane position of each immersed tube. Adjust to ensure that the overall axis position of the immersed tube meets the design requirements;

4) The immersed tube is installed with a steel box for buoyancy, which solves the problem of insufficient buoyancy of the immersed tube itself;

5) Optimize the dismantling process of the steel pontoon, that is, when the upper lug at the front of the steel pontoon exposes the immersed tube, use a crane to hang the upper lug at the front of the steel pontoon and continue to pull out the steel pontoon. When the upper lugs at the rear of the buoyant box are exposed to the immersed tube, place the steel buoyant box on the foundation bed and hang the upper lugs at the rear of the steel buoyant box. The lifting ship lifts the steel buoyant box and continues to pull out the steel buoyant box until Pull the steel pontoon all the way out of the immersed tube. Through the optimization of the aided demolition process of the steel box, the foundation bed of the next immersed tube can be effectively protected.

Description of drawings

Fig. 1 is the flow chart of the installation process of the power plant sea intake and drainage sinking pipe of the present invention;

Fig. 2 is a schematic diagram of the installation sequence of the water intake immersed tube installed by adopting the installation process of the power plant offshore intake and drain immersed tube of the present invention;

Fig. 3 is a schematic diagram of the installation sequence of the drainage immersed pipe installed by adopting the installation process of the offshore water intake and drainage immersed pipe of the power plant of the present invention;

Fig. 4 is the front view of the steel pontoon used in the installation process of the power plant's offshore intake and drainage sinking pipe of the present invention;

Fig. 5 is the rear view of the steel pontoon used in the installation process of the offshore water intake and sinking pipe of the power plant of the present invention;

Fig. 6 is the plan view of the steel pontoon used in the installation process of the power plant's sea intake and drainage immersed pipe of the present invention;

Fig. 7 is the axial sectional view of the steel buoyancy tank adopted in the installation process of the offshore intake and drainage sinking pipe of the power plant of the present invention;

Fig. 8a is a schematic structural view of the steel buoy box used in the installation process of the offshore water intake immersed pipe of the power plant of the present invention and tied to the second and third water intake immersed pipes;

Figure 8b is a side view of Figure 8a;

Fig. 9a is a schematic structural view of the steel buoy box used in the installation process of the offshore water intake immersed tube of the power plant of the present invention and tied to the water intake immersed tube of the fourteenth section;

Figure 9b is a side view of Figure 9a;

Fig. 10a is a schematic structural view of the steel buoy box used in the installation process of the offshore water intake and drainage immersed pipe of the power plant of the present invention and tied to the first and third section of the drainage immersed pipe;

Figure 10b is a side view of Figure 10a;

Fig. 11 is a top view of the steel buoy box used in the installation process of the power plant's offshore intake and drainage immersed pipe of the present invention and tied to the fifty-second section of the drainage immersed pipe;

Fig. 12 is a top view of the steel buoy box used in the installation process of the offshore water intake and drainage immersed pipe of the power plant of the present invention tied to the fifty-ninth section and the sixty-first section drainage immersed pipe;

Fig. 13 is a top view of the steel buoy box used in the installation process of the immersed pipe for the offshore intake and drainage of the power plant of the present invention and tied to the immersed pipe at the head of the outlet.

detailed description

The present invention will be further described below in conjunction with accompanying drawing.

Please refer to Fig. 1 to Fig. 13, the installation process of an immersed tube for water intake and drainage of a power plant in the present invention includes the following steps: prefabrication of the immersed tube, barge on the immersed tube, transportation by semi-submersible barge, installation of steel buoyancy tank, and submersion of the semi-submersible barge , Immersed tube hoisting, Immersed tube positioning, Immersed tube sinking butt joint, pull tight, remove steel buoyancy tank, remove measuring tower, front section jack and install gusset plate.

During the prefabrication steps of immersed tubes, 20 sections of water intake immersed tubes, two water intake head caissons, 64 sections of drainage immersed tubes and three outfall head immersed tubes are prefabricated at the prefabrication yard wharf; The number of prefabricated parts is compiled from small to large in the side direction, so that the intake and drainage immersed pipes can be installed alternately from the shore side to the sea side; The cross-section is rectangular; the fourteenth section of the immersed tube is a double-hole co-walled tube transitioning to two single-hole tubes in a "Y" shape, and the cross-section of each hole is also rectangular; the fifteenth section of the water-immersed tube to the second The water intake and immersed tubes of the tenth section are all single-hole tubes, and the cross-sections of the holes are all rectangular; One end of the six-section water intake and immersed tube connection is a straight face, and the other end is a 15° slope; both ends of the nineteenth and twentieth water intake and immersed tubes are both 15° slopes; each water intake The head caisson has a cylindrical shape with a top plate and a bottom plate, and a circle of water inlet windows supported and separated by reinforced concrete pillars is opened along the circumference. Each water inlet window is equipped with a copper alloy water inlet grille; Well-shaped beams are set at the intersections of the beams; the prefabricated number of immersed drainage pipes is 64 sections; the immersed drainage pipes from the first section to the fifty-first section are all three-hole pipes, and the horizontal section of each hole The cross-section is rectangular; the fifty-second section of the drainage sinking pipe is a three-hole co-wall pipe transitioning to three single-hole pipes, and the cross-section of each hole is rectangular; the fifty-third section of the drainage sinking pipe to the sixty-fourth section of the drainage sinking The pipes are all single-hole pipes and the cross-section of the hole is rectangular; the immersed tube at the head of each drain is a single-hole immersed tube with a square cross-section and the size of the hole gradually decreases along the direction of water flow. The top of the immersed tube at the head of the drain Set three rectangular rhinoceros heads, and set a drainage window around each rhinoceros head;

When carrying out the barge step of the immersed tube, the prefabricated immersed tube is installed on the semi-submersible barge using the air bag transfer process, and the immersed tube is placed at the bow of the semi-submersible barge, and only one section of immersed tube is installed each time;

When carrying out the semi-submersible barge transportation step, the semi-submersible barge equipped with a section of immersed tube is towed by the tugboat from the wharf of the precast yard to the submerged pit along the set channel. The semi-submersible barge follows the installation axis of the immersed tube and the bow faces the sea side , the stern of the ship faces the shore side, and then throws the figure-of-eight anchors in place through the four corners; the submerged pit of the water intake immersed tube is set on the extension line of the installation axis of the water intake immersed tube and is 466m away from the installation position of the first section of the water intake immersed tube; There are two submerged pits for the drainage immersed pipe. The first submerged pit for the drainage immersed pipe is set on the extension line of the installation axis of the drainage immersed pipe and is 774m away from the installation position of the first section of the drainage immersed pipe. The submerged pit of the pipe is set at the foundation groove of the immersed pipe at the head of the drain;

When installing the steel pontoon, the crane ship is in place first, then the measuring GPS and the pulling jack are installed, and then the steel pontoon is installed through the crane ship; when the crane ship is in place, the crane ship is coaxial with the semi-submersible barge Stop at the bow of the semi-submersible barge in line and place it in place through the four corners; when installing the measurement GPS, place the measurement GPS on the top of the measurement tower, connect it to the computer of the crane ship through wireless signals, and then use the crane ship to Lift the measuring tower onto the embedded part of the immersed tube with a small hook, and fix it on the embedded part through flange bolts; a measuring tower should be installed at the head and tail of the central axis of the immersed tube; Positioning control; the pulling jack is installed on the lifting ring at the head of the immersed tube; when the steel buoyancy box is installed, the steel buoyancy box is placed on the flat barge, and the flat barge is docked on the side of the semi-submersible barge after it is in place; the crane ship passes Move the ship horizontally to lift the steel buoy box from the flat barge to the semi-submersible barge, and then insert the steel buoy box into each channel of the immersed tube by moving the ship back and forth and pulling the hoist on the semi-submersible barge; It is plugged in the channel of the immersed tube, and steel buoyancy tanks are added to the top of the water intake immersed tube in the fourteenth section and the drainage immersed tube in the fifty-second section to help float to solve the balance problem during the hoisting process. In addition, in the second section And the third section of water intake pipe, the first section to the fourth section, the eighth section, the thirteenth section, the eighteenth section, the twenty-second section, the twenty-seventh section, the thirty-second section, the third section The two sides of the drainage immersed pipes in the seventeenth, forty-second, fifty-ninth and sixtieth sections are bound with steel buoyancy tanks to aid buoyancy. Due to the weight of these components, the inner buoyancy of the steel buoyancy tanks is limited; That is, after the semi-submersible barge and the crane ship are in place in the diving pit, the steel buoy box 200 is hoisted to both sides of the immersed tube 100 by the crane ship and the tied steel wire rope 300 (diameter 43 mm) is fastened. The pull rings 101 on both sides of the tube 100 and the outer positioning ring 201 of the steel buoyancy tank 200 are set loosely; when the immersed tube 100 dives into the water, the steel buoyancy tank 200 floats up, and the binding steel wire rope 300 is naturally tightened. When the steel buoyancy tank 200 After floating up until the top surface is flush with the top surface of the immersed tube 100, the semi-submersible barge suspends the dive, and the thin steel wire rope 400 (diameter 15mm) tied to the upper lug 22 of the steel buoyancy tank 200 is tightened by the operator and The end of the steel wire rope 400 is tied to the pull ring 102 pre-buried in the middle of the top plate of the immersed tube 100, so that the steel buoyant tank 200 is close to the side wall of the immersed tube 100, preventing the steel buoyant tank 200 from drifting to both sides (see Figure 8a to Fig. 10b); After that, the semi-barge continues to dive until the top surface of the immersed tube is submerged into the water surface by 1m;

When the semi-submersible barge dives, it is carried out after the installation of the steel buoyancy tank is completed, and the preparations before the dive must be carried out first, including sea sweeping, selection of diving and hoisting and installation periods; sea sweeping means sinking in the first section. Before the pipe installation, arrange the survey ship to be equipped with a multi-beam echo sounder to sweep the sea in the diving pit area and the lifting route, and draw an accurate contour map; the selection of the diving and lifting installation time is to collect the tidal level and meteorological data over the years , combined with the draft of the immersed tube, the water depth of the diving pit and the lifting route, find out the tide level time period that meets the requirements of the diving and lifting water depth, so as to select the time for diving, lifting, and installation operations; the semi-submersible barge dives with water, When the upper surface of the top plate of the immersed tube is slightly higher than the water surface, the lifting ship moves the position forward first, so that the lifting bar extends from between the bow towers of the semi-submerged barge into the entire immersed tube of the semi-submersible barge. At 1/2 of the length, when the vertical line of the main hook of the crane ship coincides with the center of the immersed tube, stop moving the ship, put down the main hook, hang the suspension cable, and then the semi-submersible barge continues to dive until the top of the immersed tube is immersed Stop when the water surface is about 1m;

During the hoisting step of the immersed tube, the crane ship lifts the immersed tube away from the semi-submersible barge. During the hoisting process, keep the top surface of the immersed tube 1m below the water surface, and then tighten the anchor to move the ship position, so that the pulling rod is withdrawn from the semi-submersible barge. When the submersible barge and the crane ship move to the installation position, they drop the anchor and take up the cable in place; then the semi-submersible barge floats up with water, takes up the cable and moves out of the submerged pit, and then moves out of the channel position, and then is towed back to the prefabricated yard wharf by the tugboat for the lower section sinking tube loading, transport and submersion;

When carrying out the steps of positioning the immersed tube, it includes the positioning of the crane ship and the initial positioning of the immersed tube in sequence;

When positioning the crane ship, the crane ship hangs the immersed tube into the range of the foundation groove and then stops the ship and anchors. Refer to the measurement tower reserved at the end of the immersed tube in the previous section as the benchmarking standard, and move the position of the ship by retracting and releasing the cables. When the crane ship When the immersed tube is hoisted to 10m away from the installed front section immersed tube, stop moving the ship and precisely adjust the position of the ship to prepare for the installation of the immersed tube;

When conducting the initial positioning of the immersed tube, the computer of the crane ship receives the GPS signal from the top of the immersed tube through wireless signals, and reflects the precise position of the immersed tube on the positioning software. The surveyor directs the winch operator to perform the initial positioning. Keep the axis of the immersed tube basically aligned with the installation axis, and stop moving the ship when the immersed tube is slowly approaching and about 1m away from the immersed tube of the front section;

When performing the sinking and docking steps of the immersed tube, it includes the underwater docking of the drainage immersed tube and the underwater sinking tube of the water intake;

When carrying out the underwater docking of the immersed drainage tube, the immersed drainage tube to be installed is slowly approached to the immersed drainage tube of the front section. On the left side, during the forward movement of the immersed drainage pipe to be installed, it should be slightly on the right side of the immersed drainage pipe of the front section. Slowly approach the guide member to the left until it touches the guide member and stop moving to the left. At this time, start to lower the drain sinking pipe to be installed until the elevation is the same as that of the front drain sinking pipe. The water-saving sinking pipe is close to complete the docking;

When carrying out the underwater docking of the water intake immersed tube, the horizontal and vertical positions of the docking are controlled by the measuring tower. If the docking is difficult, the docking can be completed through underwater observation and exploration by divers; The pipe slowly approaches the immersed pipe for water intake at the front section until it is 1m away from the immersed pipe for water intake at the front section, then stops moving, adjusts the axis position and elevation of the immersed pipe to be installed to be consistent with the immersed pipe for water intake at the front section, and then moves the crane ship forward , until the water intake immersed tube to be installed is close to the water intake immersed tube of the front section, and the docking is completed;

When performing the pulling and tightening steps, divers are launched into the water to carry out the pulling and closing operation of the immersed tube. The pulling jack is connected to the lifting point at the tail of the immersed tube in the front section through a wire rope and a shackle. After the connection is completed, the oil pump on the workboat starts to supply oil, and the jack rod is recovered. , the immersed tube starts to pull together, and stops until the joint of the two immersed tubes is less than 2cm. The diver takes underwater photography to obtain evidence. The shackle on the lifting point of the immersed tube;

When carrying out the step of removing the steel buoyant tank, it includes the water injection sinking of the steel buoyant tank, the pulling out of the steel buoyant tank, the water discharge of the steel buoyant tank and the recovery of the steel buoyant tank;

When sinking the steel pontoon with water injection, in order to accurately control the water injection volume of the steel pontoon, foam has been installed in the inner cavity during the manufacture of the steel pontoon to ensure that the gravity of the steel pontoon is slightly greater than its buoyancy after it is filled with water That's it.

When pulling out the steel pontoon, after the steel pontoon sinks to the bottom plate of the immersed tube, the diver connects the core-pulling anchor cable of the crane ship to the upper lug at the front of the steel pontoon through a shackle. In the deep section, a guide frame can be installed at the bow to reduce the elevation angle of the cable. The crane ship indirectly tightens the cable to try to pull the steel buoy. Only when the buoyant tank moves smoothly can the steel buoyant tank be pulled out of the immersed tube; when the upper lugs at the front of the steel buoyant tank are exposed to the immersed tube, use a crane to hang the upper lugs at the front of the steel buoyant tank and continue to pull out Steel pontoon, when the upper lug at the rear of the steel pontoon exposes the immersed tube, place the steel pontoon on the foundation bed and tie the upper lug at the rear of the steel pontoon, the crane lifts the steel pontoon and continues to pull The steel buoyancy box is tapped until all the steel buoyancy boxes are pulled out of the immersed tube.

When the steel pontoon is out of the water, after the steel pontoon pulls out the immersed tube, the lifting hook is lowered by the crane, and the divers change the cable underwater, and the hook is hung on the four upper lugs of the steel pontoon. , and open the water outlet valve at the tail of the steel buoy to drain water. After the hook mooring is completed, the crane ship tightens the suspension cable and slowly lifts the steel buoy out of the water. Since the gravity of the steel buoy is slightly greater than the buoyancy at this time, Therefore, there will be no upward jump when lifting out of the water;

When the buoyant tank is recovered, after the steel buoyant tank is hoisted out of the water and the steel buoyant tank is drained, the steel buoyant tank is put back to the water surface by the crane ship, and the water inlet and outlet valves on the steel buoyant tank are closed, and then the steel buoyant tank is put back into the water surface. The pontoon is hoisted to the flat barge for storage, waiting for the installation of the next immersed tube;

During the steps of dismantling the measuring tower, the front section jack and installing the buckle plate, the divers underwater remove the measuring tower at the shore side and the jack on the front section immersed tube and lift them out of the water, then the steel buoyancy tank is filled with water and sank by the lifting ship Pull out the immersed tube piece by piece to complete the installation of this section of immersed tube. After the installation of the immersed tube is completed, in order to ensure that the joints of the immersed tube do not loosen, the counter-tensioning device cannot be removed immediately. It should be removed after the installation of the next section of immersed tube is completed, and finally the gusset plate is installed.

When installing the water intake pipe, a joint grouting step is also required, that is, the cement slurry is injected through the grouting pipe reserved at the joint of the two immersed pipes through the pressure pump and injected between the two rings of water stops of the two immersed pipes in the void.

The steel buoyant tank adopted in the installation process of the offshore water intake and drainage sinking pipe of the power plant of the present invention includes a closed box with a rectangular cross section consisting of a front sealing plate 1, a rear sealing plate 2, a top plate 3, a bottom plate 4, and two side plates 5, 5′. warehouse, of which,

The middle part of the closed warehouse is divided into the front warehouse 10 and the rear warehouse 30 by a partition plate 20; the length of the front warehouse 10 and the rear warehouse 30 is the same; The length and width of the section are respectively less than the length and width of the cross-section of the inner hole of the single-section intake and drainage pipe;

The top of the front cover plate 1 is provided with a front storehouse ventilation valve 11, two front storehouse water inlet valves 12, a rear storehouse breather valve 13 and two rear storehouse water inlet valves 14 side by side, and the lower part of the front cover plate 1 is arranged side by side. A front warehouse outlet valve 15 and a rear warehouse outlet valve 16 are provided;

Rear storehouse ventilation valve 13 communicates with rear storehouse 30 through a back storehouse vent pipe 130; 30;

The two rear warehouse water inlet valves 14 are communicated with the rear warehouse 30 through two rear warehouse water inlet pipes 140 in one-to-one correspondence; the two rear warehouse water inlet pipes 140 are horizontally arranged along the length direction of the front warehouse 10 and their inner ends are all Extend through the partition 20 into the rear compartment 30;

The rear warehouse outlet valve 16 communicates with the rear warehouse 30 through a rear warehouse outlet pipe 160; the rear warehouse outlet pipe 160 is horizontally arranged along the length direction of the front warehouse 10 and their inner ends all pass through the partition plate 20 and stretch into the rear warehouse 30;

In order to facilitate hoisting, a pair of end lugs 21 are respectively arranged oppositely at the upper and lower ends of the front cover plate 1; upper lug 22;

In order to facilitate transportation, a pair of rollers 40 are respectively provided at the front and rear of the bottom plate 4 .

The above embodiments are only for the purpose of illustrating the present invention, rather than limiting the present invention. Those skilled in the relevant technical fields can also make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent The technical solutions should also belong to the category of the present invention and should be defined by each claim.

Claims (7)

1. An installation process for a power plant offshore water taking and draining immersed tube is characterized by comprising the following steps: prefabricating immersed tubes, refuting the immersed tubes, transporting a semi-submersible barge, installing a steel buoyancy tank, submerging the semi-submersible barge, hoisting the immersed tubes, positioning the immersed tubes, submerging and butting the immersed tubes, tightly drawing the immersed tubes, dismantling the steel buoyancy tank, dismantling a measuring tower, a front jack and installing a buckle plate;

when the immersed tube prefabricating step is carried out, prefabricating a plurality of sections of water taking immersed tubes, two water taking head caissons, a plurality of sections of drainage immersed tubes and three drainage outlet head immersed tubes on a prefabricating yard wharf; when in prefabrication, the number of the prefabricated part is compiled from the shore side to the sea side from small to large so as to facilitate the alternate installation of the water taking and draining immersed pipes from the shore side to the sea side;

when the immersed tube barge step is carried out, the immersed tube which is prefabricated is arranged on a semi-submersible barge, the immersed tube is arranged at the bow position of the semi-submersible barge, and only one section of immersed tube is arranged each time;

when the semi-submersible barge is transported, the semi-submersible barge provided with a section of immersed tube is dragged to a submerged pit from a precast yard wharf by a tugboat, the semi-submersible barge is along the installation axis direction of the immersed tube, the bow of the semi-submersible barge faces the sea side, the stern of the semi-submersible barge faces the shore side, and then the semi-submersible barge is anchored in place by four-corner anchors;

when the steel buoyancy tank is installed, the crane ship is in place firstly, then a measurement GPS and a pull-in jack are installed, and the steel buoyancy tank is installed through the crane ship; when the crane ship is in place, the crane ship and the semi-submersible barge are coaxially stopped at the bow of the semi-submersible barge and are in place by anchoring splayed anchors at four corners; when the measurement GPS is installed, the measurement GPS is placed at the top end of the measurement tower and is connected with a computer of a crane ship through a wireless signal, then the measurement tower crane is placed on an embedded part of the immersed tube and is fixed on the embedded part through a flange bolt; a measuring tower is arranged at the head end and the tail end of the central axis of the immersed tube; the pull-in jack is arranged on a hanging ring at the head part of the immersed tube; when the steel buoyancy tanks are installed, the steel buoyancy tanks are placed on the flat barge, and the flat barge is berthed at one side of the semi-submersible barge after being in place; the steel buoyancy tanks are lifted from the flat top barge to the semi-submersible barge by the crane ship through transverse ship moving, and then are plugged into each pore channel of the immersed tube through forward and backward ship moving and traction by a winch on the semi-submersible barge;

when the semi-submersible barge submerges, after the steel buoyancy tank is installed, the semi-submersible barge is filled with water and submerges, when the upper surface of the top plate of the immersed tube is slightly higher than the water surface, the crane ship moves forward to enable a derrick of the crane ship to extend into 1/2 of the full length of the immersed tube of the semi-submersible barge body from the space between the first tower and the second tower of the semi-submersible barge, the ship moving is stopped when the vertical line of a main hook of the crane ship is superposed with the center of the immersed tube, the main hook is put down, a suspension cable is tied, and then the semi-submersible barge continues to submerge until the top of the immersed tube is immersed into the water surface for about 1 m;

when the immersed tube hoisting step is carried out, the crane ship moves the ship position backwards, the immersed tube is hoisted away from the semi-submersible barge, the top surface of the immersed tube is kept 1m below the water surface in the hoisting process, the ship position is moved by tightening the rear anchor, the pulling rod is made to withdraw from the semi-submersible barge, then the semi-submersible barge is drained, floated upwards and the cable is collected to move out of the submergence pit, the semi-submersible barge is moved out of the channel position, the crane ship is moved to the installation position, the cable is collected by anchoring, and finally the semi-submersible barge is pulled back to a wharf of a prefabrication field by a tugboat for barge refuting, transporting and submerging the immersed;

when the immersed tube positioning step is carried out, the method comprises crane ship positioning and immersed tube primary positioning which are sequentially carried out;

when the crane ship is positioned, the crane ship suspends the immersed tube and stops the ship for anchoring after entering the range of the foundation trench, the reference of a measuring tower reserved at the tail part of the front section immersed tube is taken as a standard, the ship position is moved by retracting and releasing a cable, and when the crane ship suspends the immersed tube to be 10m away from the front section immersed tube, the ship movement is stopped and the ship position is accurately adjusted to prepare for the installation of the immersed tube;

when the immersed tube is initially positioned, a computer of the crane ship receives a signal of a measuring GPS at the top of the immersed tube through a wireless signal, the accurate position of the immersed tube is reflected on positioning software, a measurer feeds back information to a captain, the captain instructs a winch operator to lay a cable for initial positioning, the axis of the immersed tube is basically aligned with the installation axis, and the vessel is stopped to move when the immersed tube slowly approaches and is 1m away from the immersed tube at the front section;

when the immersed tube sinking butt joint step is carried out, the underwater butt joint of the drainage immersed tube and the underwater butt joint of the water taking immersed tube are included;

when the drainage immersed pipes are butted underwater, firstly, the drainage immersed pipes to be installed are slowly close to the drainage immersed pipes of the front section, at the moment, the drainage immersed pipes to be installed are kept higher than the drainage immersed pipes of the front section by 1m, until the distance between the drainage immersed pipes to be installed and the drainage immersed pipes of the front section is less than 50cm, then, the drainage immersed pipes to be installed are slowly close to the guide member to stop moving leftwards until the drainage immersed pipes to be installed are contacted with the guide member, at the moment, the drainage immersed pipes to be installed are started to be placed until the elevation is consistent with that of the drainage immersed pipes of the front section, the drainage immersed pipes are stopped to be placed, and then, the drainage immersed pipes are slowly;

when the water taking immersed tube is in underwater butt joint, the positions in the horizontal direction and the vertical direction of the butt joint are controlled by the measuring tower, when in butt joint, the water taking immersed tube to be assembled is slowly close to the front section water taking immersed tube, the movement is stopped until the distance is 1m from the front section water taking immersed tube, the axis position and the elevation of the water taking immersed tube to be assembled are adjusted to be consistent with those of the front section water taking immersed tube, and then the crane ship moves forwards until the water taking immersed tube to be assembled is close to the front section water taking immersed tube;

when the step of pulling and closing tightly is carried out, a diver launches to carry out pulling and closing operation of the immersed tube, a pulling and closing jack is connected with a hanging point at the tail part of the front section immersed tube through a steel wire rope and a shackle, after the connection is finished, an oil pump on a working ship starts to supply oil, a pull rod of the jack is recovered, the immersed tube starts to be pulled and closed until the seam of the two sections of immersed tubes is less than 2cm, the pulling and closing are stopped, finally, the crane ship loosens the hook, and then the diver removes the shackle on the hanging point of the immersed tube underwater;

when the step of dismantling the steel buoyancy tank is carried out, the steps of water injection sinking, steel buoyancy tank pulling out, steel buoyancy tank water outlet and steel buoyancy tank recycling of the steel buoyancy tank are sequentially carried out;

when the steel buoyancy tank is filled with water and sinks, in order to accurately control the water injection amount of the steel buoyancy tank, foam is installed in an inner cavity when the steel buoyancy tank is manufactured;

when the steel buoyancy tank is pulled out, after the steel buoyancy tank sinks to the bottom plate of the immersed tube, a diver connects a core-pulling anchor cable of a crane ship with a head lifting ring of the steel buoyancy tank through a shackle, the crane ship indirectly tightens the cable to pull the steel buoyancy tank in an attempt, if the cable is blocked in the attempt pulling process, the cable is immediately loosened and the ship is moved backwards until the steel buoyancy tank moves smoothly in the attempt pulling process, and the steel buoyancy tank can be continuously pulled out of the immersed tube;

when the steel buoyancy tank is drained, after the steel buoyancy tank is pulled out of the immersed tube, the lifting hook is lowered by the crane ship, a diver carries out cable replacement under water, the lifting hook is tied on four lifting rings at the top of the steel buoyancy tank, a water outlet valve at the tail of the steel buoyancy tank is opened for drainage, and after the lifting hook is tied with a cable, the crane ship tightens the lifting cable and slowly lifts the steel buoyancy tank out of the water;

when the floating box is recovered, after the steel floating box is lifted out of the water surface and the steel floating box is drained, the steel floating box is lifted to a flat barge by a crane ship to be stored, an inlet valve and an outlet valve on the steel floating box are closed, and the next immersed tube is waited to be installed;

when the steps of dismantling the measuring tower, the front section jack and installing the buckle plate are carried out, a diver removes the measuring tower at one end of the bank side and the jack on the front section immersed tube underwater and lifts the measuring tower and the jack out of the water surface, and then installs the buckle plate to complete the installation work of the section of immersed tube.

2. The installation process of offshore water taking and draining immersed tube in power plant according to claim 1, wherein when the water taking pipe is installed, the step of joint grouting is carried out after the step of dismantling the measuring tower, the front section jack and the installation buckle plate, namely, cement paste is injected into a gap between two circles of water stop belts of the two sections of water taking immersed tubes through the grouting pipe reserved at the joint of the two sections of immersed tubes by the pressure pump.

3. The installation process of the offshore water taking and draining immersed tube of the power plant as claimed in claim 1 or 2, wherein the prefabrication step of the immersed tube is carried out, the prefabrication quantity of the water taking immersed tube is twenty sections, the first section to the thirteen sections of the water taking immersed tube are double-hole common-wall tubes, and the cross section of each hole is rectangular; the fourteenth section of the water taking immersed tube is a double-hole co-wall tube and is transited to two single-hole tubes, and the cross section of each hole is also rectangular; the fifteenth section of the water taking immersed tube to the twentieth section of the water taking immersed tube are all single-hole tubes, and the cross sections of holes are all rectangular; one end surface of the seventeenth section of the water taking sinking pipe connected with the fifteenth section of the water taking sinking pipe and one end surface of the eighteenth section of the water taking sinking pipe connected with the sixteenth section of the water taking sinking pipe are straight surfaces, and the other end surface is an inclined surface; both end surfaces of the nineteenth section of the water taking immersed tube and the twentieth section of the water taking immersed tube are inclined surfaces; each water intake head caisson is cylindrical and is provided with a circle of water inlet windows which are supported and separated by reinforced concrete struts along the circumference, and each water inlet window is provided with a water inlet grating; a cross beam in a shape like a Chinese character 'jing' is arranged in each water intake head caisson, and a vertical column is arranged at the intersection of the cross beams.

4. An installation process for a marine drainage immersed tube from a power plant according to claim 1 or 2, characterized in that, when the immersed tube prefabrication step is carried out, the number of prefabricated drainage immersed tubes is sixty-four sections; the first section of the drainage immersed tube to the fifty-first section of the drainage immersed tube are all three-hole tubes, and the cross section of each hole is rectangular; the fifty-second section of the drainage immersed tube is a three-hole common-wall tube and is transited to three single-hole tubes, and the cross section of each hole is rectangular; the fifty-third section to sixty-fourth section of the drainage immersed tube are all single-hole tubes, and the cross sections of holes are all rectangular; each water outlet head sinking pipe is a single-hole sinking pipe with a square cross section, the size of a hole is gradually reduced along the water flow direction, three rectangular rhinoceros heads are arranged at the top of each water outlet head sinking pipe, and a drainage window is arranged around each rhinoceros head.

5. The installation process of the offshore water taking and draining immersed tube of the power plant as claimed in claim 1 or 2, wherein when the semi-submersible barge transportation step is carried out, the submergence pit of the water taking immersed tube is arranged on the extension line of the installation axis of the water taking immersed tube and is 466m away from the installation position of the first section of the water taking immersed tube; the number of the submerged pits of the drainage immersed tube is two, the submerged pit of the first drainage immersed tube is arranged on the extension line of the installation axis of the drainage immersed tube and is 774m away from the installation position of the first drainage immersed tube, and the submerged pit of the second drainage immersed tube is arranged at the position of the base groove of the head immersed tube of the drainage outlet.

6. The installation process of the offshore water taking and draining immersed tube in the power plant according to the claim 1 or 2, characterized in that, when the steel buoyancy tank installation step is carried out, besides the steel buoyancy tank is plugged in the pore canal of the immersed tube, an external steel buoyancy tank is adopted, namely, the steel buoyancy tanks are hung to the two sides or the top of the immersed tube by a crane ship and tied with binding steel wire ropes which are loosely arranged in pull rings at the two sides of the immersed tube and outer positioning rings of the steel buoyancy tanks, after the immersed tube is submerged into water, the steel buoyancy tank floats upwards, the binding steel wire rope is naturally tensioned, when the steel buoyancy tank floats upwards until the top surface of the steel buoyancy tank is flush with the top surface of the immersed tube, the semi-submersible barge suspends, an operator tensions the thin steel wire rope tied on the hanging ring of the steel buoyancy tank and ties the end part of the steel wire rope on a pull ring pre-embedded in the middle of the top plate of the immersed tube, the steel tank is abutted against the side wall of the immersed tube, and then the semi-submersible barge continues to submerge until the top surface of the immersed tube is submerged into the water surface by 1 m.

7. The process for installing the offshore water taking and draining immersed tube in the power plant as claimed in claim 1 or 2, wherein the step of submerging the semi-submersible barge is carried out by preparing before submerging, including the time periods of sweeping, selecting submerging and hoisting installation.