A method for constructing a high-pier trestle in deep water in a narrow canyon with inclined bare rock

Abstract

The present application belongs to the technical field of trestle construction, and relates to a method for constructing a high-pier trestle in deep water in a narrow canyon with inclined bare rock, which comprises: step one, installing abutments and a plurality of piers at the inclined bare rock on both sides of the canyon to complete the front end trestle construction; step two, building a drilling platform, the floating drilling platform moves on the water surface through the anchor rope and the first winding device, and the connection angle of the anchor rope is adjusted by the rotating drive device and the turntable; step three, the steel pipe piles are positioned by the guide frame and the floating drilling platform, and after punching, the steel cage is placed and the underwater concrete is poured; step four, the steel pipe piles are constructed. Repeat steps three and four until the trestle gradually extends toward the mid-span direction of the canyon water area. The present application has the effect of solving the problem that the floating drilling platform is easily floated due to the impact force of the water flow on the drilling platform, and it is difficult for the floating drilling platform to be correctly positioned at the pile position of the steel pipe pile.

Description

Technical Field

[0001] The present application relates to the field of trestle construction, and in particular to a method for constructing a high-pier trestle in deep water in a narrow canyon with inclined bare rock. Background Art

[0002] The super-large bridge is constructed in the canyon area. In order to ensure the transportation of large equipment, materials and components, and to ensure the progress and convenience of the project construction, a trestle is required to connect the construction sites on both sides of the canyon during the construction process. The trestle is an auxiliary temporary bridge structure temporarily built during the construction of the project for transporting materials. The construction of the trestle includes the pile foundation construction of steel pipe piles. In the prior art, the pier structure of the trestle generally adopts a steel pipe pile structure, and the pile foundation construction of the steel pipe pile adopts a floating drilling platform as a construction platform for inserting and driving the steel pipe piles.

[0003] The floating drilling platform includes several pontoons as floating bodies, and connecting beams are connected between the pontoons. A positioning plate is installed on the side of the connecting beam away from the water surface. A positioning hole is penetrated on the side of the positioning plate away from the Bailey beam for positioning when the steel pipe pile is driven. Ropes are set between the floating drilling platform and the two sides of the canyon for connection and anchoring. The floating drilling platform can be moved on the water surface by adjusting the length of the rope. In the pile foundation construction, the construction personnel locate the steel pipe pile position through the positioning hole, and then hoist the steel pipe pile to the positioning hole to drive the steel pipe pile with a vibrating hammer.

[0004] However, when the water flow in the canyon water area is turbulent, the water flow impacts the floating drilling platform. The impact force of the water flow on the drilling platform can easily cause the floating drilling platform to float, and it is difficult for the floating drilling platform to be correctly positioned at the pile position of the steel pipe pile. Summary of the invention

[0005] In order to solve the problem that the floating drilling platform is easily floated due to the impact of water flow, and the floating drilling platform is difficult to correctly position at the pile position of steel pipe piles, the present application provides a method for constructing a high pier trestle in deep water in a narrow canyon with inclined bare rock.

[0006] The present application provides a method for constructing a high-pier trestle bridge in a narrow canyon with inclined bare rock and deep water, which adopts the following technical solution:

[0007] A method for constructing a high-pier trestle bridge in a narrow canyon with inclined bare rock and deep water, comprising the following steps:

[0008] Step 1: Construction of the front trestle: Install abutments on the inclined bare rocks on both sides of the canyon, erect several piers located on the inclined bare rocks between the abutments and the water area, install Bailey beams on the tops of the abutments and several piers, and lay bridge decks on the Bailey beams;

[0009] Step 2: Construction of floating drilling platform: The floating drilling platform includes a number of pontoons as floating bodies, connecting beams connecting the pontoons, and positioning plates installed on the side of the connecting beams away from the water surface. Anchor ropes are respectively connected between the pontoons and the two sides of the canyon.

[0010] A first winding device capable of adjusting the length of the anchoring rope is arranged between one end of the anchoring rope close to the buoyancy box and the buoyancy box to realize the movement and positioning of the floating drilling platform. A balancing mechanism for maintaining the balance of the floating drilling platform is arranged between the first winding device and the buoyancy box. The balancing mechanism comprises a turntable connected to the first winding device, the turntable is installed on a side of the buoyancy box away from the water surface, and the turntable is connected to a rotation driving device for driving the turntable to rotate;

[0011] A floating drilling platform is built under the front trestle. The floating drilling platform moves on the water surface through the anchor rope and the first winding device, and the rotating drive device drives the turntable to rotate. The turntable rotates to adjust the connection angle of the anchor rope, and the floating drilling platform moves to position and maintain balance.

[0012] Step 3, pile foundation construction: measure and determine the position of the steel pipe pile, install a guide frame on the Bailey beam of the front trestle to limit the direction of the steel pipe pile when it is inserted, the guide frame is suspended above the water surface, the floating drilling platform moves to the position of the steel pipe pile, and the steel pipe pile is positioned by the guide frame and the floating drilling platform;

[0013] The steel pipe pile drilling rig is transferred to the bridge deck of the front trestle. The drilling rig drills holes into the riverbed through the pile holes of the steel pipe piles to form punch holes. The steel pipe piles are inserted and driven while drilling until the designed depth is reached. A steel cage is placed in the pile hole of the steel pipe pile, and underwater concrete is poured into the pile hole and punch hole of the steel pipe pile.

[0014] Step 4: Steel pipe pile construction: The steel pipe pile is fixedly connected to the Bailey beam of the front trestle, a pile connection system is installed between the steel pipe pile and the adjacent pier, a distribution beam is installed on the top of the steel pipe pile, the Bailey beam is erected on the distribution beam, and the bridge deck is laid on the Bailey beam;

[0015] Repeat steps 3 and 4 until the trestle gradually extends toward the middle of the canyon waters.

[0016] By adopting the above technical solution, abutments and several piers are installed at the inclined places on both sides of the canyon, Bailey beams are installed on the top of the abutments and several piers, and bridge decks are laid on the Bailey beams to complete the construction of the front trestle. A guide frame is installed on the Bailey beam installed at the front trestle, and the guide frame is suspended above the water surface to limit the direction of the steel pipe pile when it is inserted and driven, reducing the position deviation when the steel pipe pile is inserted and driven.

[0017] Several pontoons are transported to the water surface below the front trestle, and connecting beams are installed between the pontoons to achieve connection. The positioning plate is installed on the side of the connecting beam away from the water surface, and the end of the anchor rope close to the floating drilling platform is wound around the first winding device, the first winding device is connected to the turntable, and the turntable is connected to the rotation drive device. The end of the anchor rope away from the first winding device is fixed to the shore of the canyon. After the floating drilling platform is moved and positioned to the pile position of the steel pipe pile by the first winding device and the anchor rope, if there is a turbulent water flow in the canyon water area, the water flow will impact the floating drilling platform, and the floating drilling platform will float and deviate from the pile position of the steel pipe pile.

[0018] The floating drilling platform is offset in the direction of the water flow impact, and the first winding device adjusts the length of the anchor rope. The length of the anchor rope is only adjusted by the first winding device. After the floating drilling platform moves, there may still be a position deviation from the pile position of the steel pipe pile. The rotating drive device drives the turntable to rotate, and the turntable drives the first winding device to rotate to finely adjust the angle at which the anchor rope is wound around the first winding device, which can further improve the stability of the floating drilling platform, keep the floating drilling platform balanced and adjusted to float, and enable the floating drilling platform to move more accurately to the pile position of the steel pipe pile, solving the problem that the floating drilling platform is easily floated due to the impact of the water flow on the drilling platform, and the floating drilling platform is difficult to correctly position at the pile position of the steel pipe pile. At the same time, the turntable drives the first winding device to rotate, and the anchor rope can be adjusted to be wound around the first winding device to a suitable angle, which is conducive to improving the smoothness of the first winding device winding the anchor rope.

[0019] After measuring and determining the position of the steel pipe pile, a guide frame is installed on the Bailey beam of the front trestle to limit the direction of the steel pipe pile when it is inserted and driven. The floating drilling platform moves to the position of the steel pipe pile. While the drill is drilling, the steel pipe pile can be kept vertically inserted and driven through the guide frame and the floating drilling platform to improve the stability of the steel pipe pile when it is inserted and driven and the accuracy of the insertion position. A steel cage is placed in the pile hole of the steel pipe pile, and underwater concrete is poured into the pile hole and punching hole of the steel pipe pile. The steel cage and concrete form a reinforced concrete pile. The reinforced concrete pile and the steel pipe pile are combined to form a structure that bears force together, which can improve the strength of the steel pipe pile anchored in the rock layer of the riverbed and increase the overall stability and anti-overturning ability of the trestle. The steel pipe pile is fixedly connected to the Bailey beam of the front trestle, which can play a certain supporting role for the end of the front trestle close to the water span, and improve the stability of the front trestle. A pile connection system is installed between the steel pipe pile and the adjacent piers, and the pile connection system is used to improve the stability of the steel pipe pile.

[0020] Optionally, a brake mechanism is provided between the turntable and the pontoon to stop the rotation of the turntable. The brake mechanism includes a brake plate abutting against the side of the turntable close to the pontoon, and the side of the brake plate away from the turntable is connected to a movable drive device for driving the brake plate to approach and abut against the turntable.

[0021] By adopting the above technical solution, after the turntable drives the first winding device to complete the winding angle adjustment of the anchor rope, the mobile drive device drives the brake plate to abut the turntable, which can stop the rotation of the turntable in time so that the turntable can drive the first winding device to complete the fine adjustment of the winding angle of the anchor rope.

[0022] Optionally, the end of the anchor rope close to the canyon bank is connected to an anchor mechanism, the anchor mechanism includes a support frame installed on the canyon bank, a pulley is slidably connected to the support frame, the end of the anchor rope close to the canyon bank is wound around the outer wall of the pulley, and is connected to a second winding device via the pulley, and the pulley is connected to a lifting drive device that drives the pulley to rise and fall along the support frame;

[0023] During the construction of the floating drilling platform, the lifting drive device drives the pulley to rise and fall to a suitable height, the second winding device adjusts the length of the anchor rope between the second winding device and the first winding device via the pulley, and the floating drilling platform moves and positions along the depth direction of the water area.

[0024] By adopting the above technical solution, when the water in the canyon water area is turbulent and causes the water level to rise and fall, the lifting drive device drives the pulley to rise and fall along the support frame. After the pulley is lifted to a suitable height, the second winding device winds or loosens the anchor rope, and adjusts the length of the anchor rope between the second winding device and the first winding device, so as to realize the movement of the floating drilling platform along the depth of the water area. The floating drilling platform adjusts the contact volume with the water surface through the anchoring mechanism to adjust the influence of the buoyancy of the water flow on the floating drilling platform, which can further improve the stability of the floating drilling platform and is also conducive to the positioning of the floating drilling platform.

[0025] Optionally, the inter-pile connection system is provided with multiple layers, and the multiple layers of the inter-pile connection system are distributed between the steel pipe piles and adjacent bridge piers along the vertical direction of the steel pipe piles.

[0026] By adopting the above technical solution, when the water flow impact in the canyon water area is large, the connection system between the piles is provided with multiple layers, which can further improve the stability of the steel pipe piles.

[0027] Optionally, during the pile foundation construction, after the drilling is completed, the first hole cleaning is performed in the pile hole of the steel pipe pile, and the steel cage is placed in the steel pipe pile for the second hole cleaning.

[0028] By adopting the above technical scheme, during the pile foundation construction, the sediment produced during drilling is deposited in the pile hole of the steel pipe pile. When the sediment thickness is high, it will affect the bearing capacity of the reinforced concrete pile formed after pouring and cause the phenomenon of defective piles. Cleaning the pile hole of the steel pipe pile twice can further reduce the possibility of defective piles and improve the strength of the reinforced concrete piles and steel pipe piles.

[0029] Optionally, during the pile foundation construction, when the steel cage is placed into the pile hole of the steel pipe pile, a plurality of lifting points are provided on the steel cage along the direction in which the steel cage is placed into the pile hole of the steel pipe pile.

[0030] By adopting the above technical solution, when the steel cage is placed in the pile hole of the steel pipe pile, a number of lifting points are set on the steel cage, which can reduce the deformation of the steel cage frame when lifting and improve the stability of the steel cage lifting.

[0031] Optionally, during the construction of the steel pipe piles, a protective pad is laid between the Bailey beam and the bridge deck.

[0032] By adopting the above technical solution, a protective pad is laid between the Bailey beam and the bridge deck. The protective pad can transfer the bridge deck load to the Bailey beam and the steel pipe piles, adapt to the deformation of the bridge deck, reduce the impact of the bridge deck vibration on the Bailey beam, and improve the compressive strength of the trestle at the bridge deck.

[0033] Optionally, during the construction of the steel pipe piles, after the Bailey beam is hoisted to the top of the distribution beam, a connecting component is installed between the Bailey beam and the distribution beam. After the Bailey beam and the distribution beam are connected by the connecting component, the Bailey beam and the distribution beam are welded.

[0034] By adopting the above technical solution, the Bailey beam and the distribution beam are effectively connected through the connecting component before welding, which can improve the stability of the Bailey beam and the distribution beam before welding, thereby reducing the influence of the relative movement of the Bailey beam and the distribution beam on welding.

[0035] Optionally, the Bailey beam and the distribution beam are cross-arranged, and the connecting assembly includes a first U-shaped bolt and a second U-shaped bolt buckled on the lower chord of the Bailey beam, the first U-shaped bolt and the second U-shaped bolt are distributed on both sides of the distribution beam along the erection direction of the Bailey beam, and a clamping plate is connected between the first U-shaped bolt and the second U-shaped bolt, and the clamping plate is located on the side of the distribution beam away from the Bailey beam.

[0036] By adopting the above technical solution, a structure in which the first U-shaped bolt and the second U-shaped bolt are connected to the clamping plate is adopted. The structure is simple and easy to operate, which is beneficial to the convenience of construction workers during construction and improves the stability of the connection between the Bailey beam and the distribution beam.

[0037] In summary, this application includes the following beneficial technical effects:

[0038] 1. If there is a turbulent current in the canyon waters, the water flow will impact the floating drilling platform, causing the floating drilling platform to float and deviate from the position of the steel pipe pile. The first winding device adjusts the length of the anchor rope, and the rotating drive device drives the turntable to rotate. The turntable drives the first winding device to rotate to finely adjust the angle at which the anchor rope is wound around the first winding device, thereby improving the stability of the floating drilling platform, allowing the floating drilling platform to maintain a balanced and adjusted floating state, and allowing the floating drilling platform to move more accurately to the position of the steel pipe pile, thereby solving the problem that the impact of the water flow on the drilling platform may cause the floating drilling platform to float, and the floating drilling platform is difficult to correctly position at the position of the steel pipe pile. At the same time, the turntable drives the first winding device to rotate, and the anchor rope can be adjusted to be wound around the first winding device to a suitable angle, which is beneficial to improving the smoothness of the first winding device winding the anchor rope;

[0039] 2. The setting of the anchoring mechanism can adjust the contact volume between the floating drilling platform and the water surface to regulate the influence of the buoyancy of the water flow on the floating drilling platform, thereby improving the stability of the floating drilling platform and facilitating the positioning of the floating drilling platform. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a structural schematic diagram of a method for constructing a high-pier trestle in deep water in a narrow canyon with inclined bare rock according to an embodiment of the present application.

[0041] Figure 2 It is a structural schematic diagram showing the connection between the Bailey beam and the distribution beam.

[0042] Figure 3 This is a top view showing the bridge deck and guide frame.

[0043] Figure 4 It is a schematic diagram showing the structure of a floating drilling platform.

[0044] Figure 5 yes Figure 4 A magnified schematic diagram of center A.

[0045] Figure 6 It is a structural schematic diagram showing the anchoring mechanism.

[0046] Description of reference numerals:

[0047] 1. Front trestle; 11. Abutment; 12. Pier; 13. Bailey beam; 131. First U-bolt; 132. Second U-bolt; 133. Pressing plate; 134. Limiting frame; 14. Bridge deck; 15. Guide frame; 16. Drilling rig; 2. Floating drilling platform; 21. Floating box; 22. Connecting beam; 23. Positioning plate; 24. Anchor rope; 25. First winding device; 26. Support frame; 261. Pulley; 262. Second winding device; 263. Lifting drive device; 264. Lifting plate; 3. Turntable; 31. Rotating drive device; 32. Brake plate; 33. Moving drive device; 4. Steel pipe pile; 41. Connection system between piles; 42. Distribution beam; 43. Protective pad. DETAILED DESCRIPTION

[0048] The present application is described in further detail below.

[0049] The present application embodiment discloses a method for constructing a high-pier trestle in deep water in a narrow canyon with inclined bare rock, comprising the following steps:

[0050] Step 1, construction of the front trestle 1: install abutments 11 at the inclined bare rocks on both sides of the canyon, erect several piers 12 located at the inclined bare rocks between the abutments 11 and the water area, the piers 12 are steel pipe piles 4 anchored at the inclined bare rocks, Bailey beams 13 are installed on the tops of the abutments 11 and several piers 12, the Bailey beams 13 are erected along the distribution direction of the abutments 11 and several piers 12, and protective pads 43 are laid on the Bailey beams 13. The protective pads 43 can be made of rubber sheets to reduce the impact of the vibration of the bridge deck 14 on the Bailey beams 13 and improve the compressive strength of the trestle at the bridge deck 14. The bridge deck 14 is laid on the protective pad 43, and the bridge deck 14 is a prefabricated concrete panel. The construction of the front trestle 1 is completed at the inclined bare rocks on both sides of the canyon, and a temporary punching construction platform is formed.

[0051] Step 2, construction of the floating drilling platform 2: The floating drilling platform 2 includes two pontoons 21 as floating bodies, and a connecting beam 22 connecting the two pontoons 21. The two pontoons 21 are symmetrically distributed along the mid-span of the canyon water area. The connecting beam 22 spans between the corresponding sides of the two pontoons 21. A positioning plate 23 is installed on the side of the connecting beam 22 away from the water surface. The positioning plate 23 is positioned as a long plate with through holes, and the plate is laid on the top surface of the connecting beam 22.

[0052] Two turntables 3 are installed on the side of the buoy 21 away from the water surface and at the edge close to the canyon bank. The turntable 3 is in the shape of a horizontal disk. A rotation drive device 31 for driving the turntable 3 to rotate is arranged between the turntable 3 and the side of the buoy 21 away from the water surface. The rotation drive device 31 can be a motor, which is installed on the side of the buoy 21 away from the water surface. A brake pad is arranged on the side of the turntable 3 close to the buoy 21. The brake pad is in the shape of a horizontal disk. The side of the brake pad away from the turntable 3 is connected to a mobile drive device 33 for driving the brake pad close to the turntable 3 and abutting the turntable 3. The mobile drive device 33 can be a cylinder, which is installed on the side of the buoy 21 away from the water surface. A first winding device 25 is installed on the side of the turntable 3 away from the buoy 21. The first winding device 25 can be a first winch, and the first winch is wound with an anchor rope 24. The anchor rope 24 bypasses one end of the first winch and extends to the canyon bank, and a support frame 26 is arranged between the anchor rope 24 and the canyon bank.

[0053] The support frame 26 is a cubic frame installed on the canyon bank. The support frame 26 is slidably connected with a lifting plate 264 in the frame. A lifting drive device 263 is provided between the bottom surface of the lifting plate 264 and the bottom of the support frame 26 to drive the lifting plate 264 to do lifting and lowering movements. The lifting drive device 263 can be a hydraulic cylinder installed at the bottom of the support frame 26. A pulley 261 is installed on the top surface of the lifting plate 264. One end of the anchor rope 24 extending toward the canyon bank passes around the outer wall of the pulley 261. One end of the anchor rope 24 passing around the pulley 261 is connected to a second winding device 262. The second winding device 262 can be a second winch, and the second winch is installed on the canyon bank.

[0054] A floating drilling platform 2 is built below the front trestle 1. The floating drilling platform 2 moves on the water surface through the anchor rope 24 and the first winding device 25, and the rotating drive device 31 drives the turntable 3 to rotate. The turntable 3 rotates to adjust the connection angle of the anchor rope 24, and the floating drilling platform 2 moves and positions and maintains balance. The lifting drive device 263 drives the pulley 261 to rise and fall to a suitable height. The second winding device 262 adjusts the length of the anchor rope 24 between the pulley 261 and the first winding device 25, and the floating drilling platform 2 moves and positions along the depth direction of the water area.

[0055] Step 3, pile foundation construction: measure and determine the pile position of the steel pipe pile 4, install a guide frame 15 on the Bailey beam 13 of the front trestle 1 to limit the direction of the steel pipe pile 4 when it is inserted, the guide frame 15 includes a limit frame 134 distributed along the laying direction of the Bailey beam 13, the limit frame 134 is spliced ​​with the Bailey beam 13 to form a limit through hole that is convenient for the steel pipe pile 4 to penetrate and be lowered to the pile position of the steel pipe pile 4, the guide frame 15 is suspended above the water surface, the floating drilling platform 2 moves to the pile position of the steel pipe pile 4, and the steel pipe pile 4 is positioned by the guide frame 15 and the floating drilling platform 2, which can improve the stability of the steel pipe pile 4 when it is inserted and reduce the displacement of the position when it is inserted;

[0056] The steel pipe pile 4 drilling rig 16 is transferred to the bridge deck 14 of the front trestle 1. The drilling rig 16 drills holes into the riverbed through the pile holes of the steel pipe pile 4 to form punch holes. The steel pipe pile 4 is inserted and driven into the hole until the designed depth is reached. The pile hole of the steel pipe pile 4 is cleaned for the first time, and then a steel cage is placed in the pile hole of the steel pipe pile 4. During the hoisting of the steel pipe pile 4, two hoisting points are set on the steel cage along the direction of the steel cage being placed in the pile hole of the steel pipe pile 4. The first hoisting point is located at the top of the steel cage skeleton, and the second hoisting point is located between the midpoint and the lower third of the length of the steel cage skeleton, which can improve the stability of the bottom of the steel cage and reduce the possibility of deformation of the steel cage skeleton. The steel cage is placed in the pile hole of the steel pipe pile 4 for a second hole cleaning to reduce the possibility of defective piles, and underwater concrete is poured into the pile hole and punch holes of the steel pipe pile 4;

[0057] Step 4, construction of steel pipe pile 4: The steel pipe pile 4 is fixedly connected to the Bailey beam 13 of the front trestle 1, and a pile connection system 41 is installed between the steel pipe pile 4 and the adjacent pier 12. The pile connection system 41 is provided with multiple layers, and the multiple layers of pile connection systems 41 are distributed between the steel pipe pile 4 and the adjacent pier 12 along the vertical direction of the steel pipe pile 4, which can improve the stability of the steel pipe pile 4. A distribution beam 42 is installed on the top of the steel pipe pile 4. The distribution beam 42 can be made of I-beam. The Bailey beam 13 is erected on the distribution beam 42. After the Bailey beam 13 is hoisted to the top surface of the distribution beam 42, the Bailey beam 13 and the distribution beam 42 are arranged crosswise. A first U-shaped bolt 131 and a second U-shaped bolt 132 are buckled on the lower chord of the Bailey beam 13, and the openings of the first U-shaped bolt 131 and the second U-shaped bolt 132 are both facing downward. The first U-shaped bolt 131 and the second U-shaped bolt 132 are distributed on both sides of the distribution beam 42 along the erection direction of the Bailey beam 13, and a clamping plate 133 is connected between the first U-shaped bolt 131 and the second U-shaped bolt 132. The clamping plate 133 is a horizontally arranged long plate, and the length direction is consistent with the distribution direction of the first U-shaped bolt 131 and the second U-shaped bolt 132. The clamping plate 133 is located on the side of the distribution beam 42 away from the Bailey beam 13, and the side of the clamping plate 133 close to the distribution beam 42 abuts against the corresponding side of the distribution beam 42 to improve the stability of the Bailey beam 13 and the distribution beam 42 before welding, thereby reducing the influence of the relative movement of the Bailey beam 13 and the distribution beam 42 on the welding. A protection pad 43 is laid on the Bailey beam 13 , and a bridge deck 14 is laid on the protection pad 43 .

[0058] Repeat steps 3 and 4 until the trestle gradually extends toward the middle of the canyon waters.

[0059] The implementation principle of a method for constructing a high-pier trestle in deep water with inclined bare rock in a narrow canyon according to an embodiment of the present application is as follows: after the construction of the front-end trestle 1 is completed, a floating drilling platform 2 is built on the water surface below the front-end trestle 1; when water flow impacts the floating drilling platform 2, the floating drilling platform 2 floats and deviates from the pile position of the steel pipe pile 4; the first winding device 25 adjusts the length of the anchor rope 24; the rotating drive device 31 drives the turntable 3 to rotate; the turntable 3 drives the first winding device 25 to rotate to finely adjust the angle of the anchor rope 24 wound around the first winding device 25; the stability of the floating drilling platform 2 can be improved, the floating drilling platform 2 can be kept balanced and adjusted to float, and the floating drilling platform 2 can be moved to the pile position of the steel pipe pile 4 more accurately, thereby solving the problem that the floating drilling platform 2 is easily floated due to the impact of the water flow on the drilling platform, and the floating drilling platform 2 is difficult to be correctly positioned at the pile position of the steel pipe pile 4.

[0060] At the same time, the turntable 3 drives the first winding device 25 to rotate, and the anchor rope 24 can be adjusted to be wound around the first winding device 25 to a suitable angle, which is beneficial to improving the smoothness of the first winding device 25 winding the anchor rope 24. When the canyon water area has turbulent water flow, causing the horizontal plane to rise and fall, the lifting drive device 263 drives the pulley 261 to rise and fall along the support frame 26, and the second winding device 262 adjusts the length of the anchor rope 24 between the second winding device 262 and the first winding device 25, which can realize the adjustment of the contact volume between the floating drilling platform 2 and the water surface, so as to adjust the influence of the buoyancy of the water flow on the floating drilling platform 2, thereby improving the stability of the floating drilling platform 2, and at the same time facilitating the positioning of the floating drilling platform 2.

[0061] After the floating drilling platform 2 is positioned, the steel pipe pile 4 is positioned through the guide frame 15 and the floating drilling platform 2, and the drilling rig 16 punches the hole while inserting the steel pipe pile 4. After the steel pipe pile 4 is inserted and driven, a steel cage is placed in the pile hole of the steel pipe pile 4 and underwater concrete is poured to improve the stability of the steel pipe pile 4 anchored on the riverbed. After the pile foundation construction is completed, the pile connection system 41, the distribution beam 42, the Bailey beam 13 and the bridge deck 14 are installed on the steel pipe pile 4, and the trestle gradually extends toward the mid-span direction of the canyon water area during this cycle.

[0062] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A method for constructing a high-pier trestle in deep water in a narrow canyon with inclined bare rock, characterized in that: The following steps are involved: Step 1, construction of the front trestle (1): installing abutments (11) at the inclined bare rocks on both sides of the canyon, erecting a number of bridge piers (12) located at the inclined bare rocks between the abutments (11) and the water area, installing Bailey beams (13) on the tops of the abutments (11) and a number of bridge piers (12), and laying bridge decks (14) on the Bailey beams (13); Step 2, construction of the floating drilling platform (2): the floating drilling platform (2) includes a plurality of pontoons (21) as floating bodies, a connecting beam (22) connecting the plurality of pontoons (21), and a positioning plate (23) installed on the side of the connecting beam (22) away from the water surface, and anchoring ropes (24) are respectively connected between the pontoons (21) and the two banks of the canyon; A first winding device (25) capable of adjusting the length of the anchor rope (24) is arranged between one end of the anchor rope (24) close to the buoyancy box (21) and the buoyancy box (21) to realize the movement and positioning of the floating drilling platform (2); a balancing mechanism for maintaining the balance of the floating drilling platform (2) is arranged between the first winding device (25) and the buoyancy box (21); the balancing mechanism comprises a turntable (3) connected to the first winding device (25); the turntable (3) is installed on a side of the buoyancy box (21) away from the water surface; the turntable (3) is connected to a rotation drive device (31) for driving the turntable (3) to rotate; A floating drilling platform (2) is built below the front trestle (1). The floating drilling platform (2) moves on the water surface through an anchor rope (24) and a first winding device (25). The rotating drive device (31) drives the turntable (3) to rotate. The turntable (3) rotates to adjust the connection angle of the anchor rope (24). The floating drilling platform (2) moves to position and maintains balance. Step 3, pile foundation construction: measure and determine the pile position of the steel pipe pile (4), install a guide frame (15) on the Bailey beam (13) of the front trestle (1) to limit the direction of the steel pipe pile (4) when it is inserted, the guide frame (15) is suspended above the water surface, the floating drilling platform (2) moves to the pile position of the steel pipe pile (4), and the steel pipe pile (4) is positioned by the guide frame (15) and the floating drilling platform (2); The steel pipe pile (4) drilling machine (16) is transferred to the bridge deck (14) of the front trestle (1), the drilling machine (16) drills holes in the riverbed through the pile holes of the steel pipe pile (4) to form punch holes, and the steel pipe pile (4) is inserted and driven into the riverbed until the designed depth is reached while drilling the holes, a steel cage is placed in the pile hole of the steel pipe pile (4), and underwater concrete is poured into the pile hole and the punch hole of the steel pipe pile (4); Step 4, construction of the steel pipe pile (4): the steel pipe pile (4) is fixedly connected to the Bailey beam (13) of the front trestle (1), a pile connection system (41) is installed between the steel pipe pile (4) and the adjacent bridge pier (12), a distribution beam (42) is installed on the top of the steel pipe pile (4), the Bailey beam (13) is erected on the distribution beam (42), and the bridge deck (14) is laid on the Bailey beam (13); Repeat steps 3 and 4 until the trestle gradually extends toward the middle of the canyon waters.

2. The method for constructing a high-pier trestle in deep water in a narrow canyon with inclined bare rock according to claim 1, characterized in that: A brake mechanism for stopping the rotation of the turntable (3) is provided between the turntable (3) and the buoyancy box (21), the brake mechanism comprising a brake plate (32) abutting against a side of the turntable (3) close to the buoyancy box (21), and a moving drive device (33) for driving the brake plate (32) to approach and abut against the turntable (3) is connected to a side of the brake plate (32) away from the turntable (3).

3. The method for constructing a high-pier trestle in deep water in a narrow canyon with inclined bare rock according to claim 1, characterized in that: The end of the anchor rope (24) close to the canyon bank is connected to an anchor mechanism, the anchor mechanism comprises a support frame (26) installed on the canyon bank, a pulley (261) is slidably connected to the support frame (26), the end of the anchor rope (24) close to the canyon bank is wound around the outer wall of the pulley (261), and is connected to a second winding device (262) via the pulley (261), and the pulley (261) is connected to a lifting drive device (263) that drives the pulley (261) to rise and fall along the support frame (26); During construction of the floating drilling platform (2), the lifting drive device (263) drives the pulley (261) to rise and fall to a suitable height, the second winding device (262) adjusts the length of the anchor rope (24) between the second winding device (262) and the first winding device (25) via the pulley (261), and the floating drilling platform (2) moves and is positioned along the depth direction of the water area.

4. The method for constructing a high-pier trestle in deep water in a narrow canyon with inclined bare rock according to claim 1, characterized in that: The inter-pile connection system (41) is provided with multiple layers, and the multiple layers of the inter-pile connection system (41) are distributed between the steel pipe pile (4) and the adjacent bridge pier (12) along the vertical direction of the steel pipe pile (4).

5. The method for constructing a high-pier trestle in deep water in a narrow canyon with inclined bare rock according to claim 1, characterized in that: During the pile foundation construction, after the drilling is completed, the first hole cleaning is performed in the pile hole of the steel pipe pile (4), and the steel cage is placed in the pile hole of the steel pipe pile (4) for the second hole cleaning.

6. The method for constructing a high-pier trestle in deep water in a narrow canyon with inclined bare rock according to claim 1, characterized in that: During the pile foundation construction, when the steel cage is placed in the pile hole of the steel pipe pile (4), a plurality of lifting points are arranged on the steel cage along the direction in which the steel cage is placed in the pile hole of the steel pipe pile (4).

7. The method for constructing a high-pier trestle in deep water in a narrow canyon with inclined bare rock according to claim 1, characterized in that: During the construction of the steel pipe pile (4), a protective pad (43) is laid between the Bailey beam (13) and the bridge deck (14).

8. The method for constructing a high-pier trestle in deep water in a narrow canyon with inclined bare rock according to claim 1, characterized in that: During the construction of the steel pipe pile (4), after the Bailey beam (13) is hoisted to the top of the distribution beam (42), a connection assembly is installed between the Bailey beam (13) and the distribution beam (42). After the Bailey beam (13) and the distribution beam (42) are connected by the connection assembly, the Bailey beam (13) and the distribution beam (42) are welded.

9. The method for constructing a high-pier trestle in deep water in a narrow canyon with inclined bare rock according to claim 8, characterized in that: The Bailey beam (13) and the distribution beam (42) are arranged crosswise, and the connection assembly comprises a first U-shaped bolt (131) and a second U-shaped bolt (132) which are buckled on the lower chord of the Bailey beam (13), the first U-shaped bolt (131) and the second U-shaped bolt (132) are distributed on both sides of the distribution beam (42) along the erection direction of the Bailey beam (13), a clamping plate (133) is connected between the first U-shaped bolt (131) and the second U-shaped bolt (132), and the clamping plate (133) is located on the side of the distribution beam (42) away from the Bailey beam (13).

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