A pull-out test device for offshore wind power piles

Abstract

The present invention relates to an anti-pulling test device for offshore wind power pile foundations applied to the technical field of pile foundation testing, comprising a pile foundation, a connecting bracket, a hydraulic module, a buoyancy chamber, a cavity tube, an air vent, a water through hole, a lifting column, a reference float, a float bracket and a one-way gear. The present invention applies a sinking pressure to a buoyancy cage frame through a hydraulic module, presses the buoyancy chamber underwater, and thereby utilizes the reaction buoyancy generated by the buoyancy chamber to exert an upward pulling effect on the pile foundation. The anti-pulling test structure is convenient to be quickly built on the sea surface, and the efficiency of the anti-pulling test is effectively improved. The buoyancy chamber rises with the pile foundation, and the upward pulling buoyancy of the buoyancy chamber on the pile foundation is reduced, and the pile foundation is effectively prevented from being excessively lifted. Moreover, the lifting column in the cavity tube fails to rise with the buoyancy chamber, and the air vent and the water through hole are utilized to realize rapid water filling and exhaust in the buoyancy chamber, and the buoyancy of the buoyancy chamber is further reduced, thereby further preventing the pile foundation from being excessively lifted, and facilitating the subsequent installation and use of the pile foundation.

Description

Technical Field

[0001] The present invention relates to a pull-out test device, in particular to a pull-out test device for offshore wind power piles applied in the technical field of pile testing. Background Art

[0002] Piles are force-transmitting components that transfer all or part of the load of a building to the foundation soil and have a certain degree of rigidity and bending resistance. They are a widely used foundation form in civil engineering. The pile foundation of an offshore wind turbine is buried on the seabed. Compared with the pile foundation on land, the pull-out detection device of the pile foundation is relatively difficult to assemble, which affects the pull-out detection efficiency of the offshore wind turbine pile foundation.

[0003] The specification of Chinese invention patent CN201810667711.2 discloses "A pile foundation pull-out test device and pull-out test method", which connects the extension ribs to the steel bars on the pile body through a connecting sleeve, sleeves the steel pipe on one end of the pile body, covers the end cover, installs rubber pads, studs and nuts, passes the extension ribs through the end cover and installs bolts at the end of the extension ribs to fix the isolation part to the pile body, sinks the test pile into place by static pile pressure method, removes the steel pipe end cover, the bolts and nuts on the upper surface, removes the steel pipe cover, builds a small lifting device around the steel pipe, and uses the lifting device to pull up the steel pipe.

[0004] Due to the lack of stable installation scenarios for hydraulic equipment at sea, it is necessary to build a test platform outside the piles when conducting pull-out tests on the piles. The preparation work for setting up the pull-out test device is cumbersome, which affects the efficiency of the pile pull-out test. In addition, the traditional static pressure detection structure, i.e., the lifting device in the above patent, is prone to excessive lifting of the piles during the lifting process, which can easily damage the stability of the piles and affect their continued use. Summary of the invention

[0005] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is that the preparation work for the offshore construction of the pull-out test device is cumbersome, which affects the detection efficiency of the pile pull-out test. During the process of lifting the piles, the piles are easily over-lifted, which can easily cause the stability of the piles to be destroyed and affect the continued use of the piles.

[0006] In order to solve the above problems, the present invention provides an anti-pulling test device for offshore wind power piles, comprising a connecting bracket sleeved on the top of the pile, both ends of the connecting bracket are fixedly connected with a hydraulic module, the output end of the hydraulic module is fixedly connected with a buoyancy cage frame, and the interior of the buoyancy cage frame is movably connected with a buoyancy chamber;

[0007] The outside of the buoyancy tank is fixedly connected to a through-cavity tube, and an air vent and a water through-hole are respectively provided at the top and bottom of the through-cavity tube. A lifting column is movably sleeved inside the through-cavity tube, and an air blocking plug and a water blocking plug are respectively fixedly connected to the top and bottom of the lifting column, and the air blocking plug and the water blocking plug correspond to the air vent and the water through-hole respectively. The outside of the through-cavity tube is fixedly connected to a wave-blocking cylinder, and a reference float is sleeved inside the wave-blocking cylinder. The top of the reference float is fixedly connected to a float block bracket, and the top of the float block bracket is sleeved with the top of the lifting column, and the sleeve connection part of the float block bracket and the lifting column is rotatably connected with a one-way gear, and the one-way gear is meshed with the top of the lifting column.

[0008] In the above-mentioned pull-out test device for offshore wind turbine pile foundations, pressure is applied to the buoyancy cage frame through a hydraulic module to press the buoyancy chamber underwater, thereby utilizing the reaction buoyancy to exert a pull-out effect on the pile foundation. The pull-out test structure is simple and can be quickly constructed on the sea surface, thereby effectively improving the efficiency of the pull-out test.

[0009] As a further improvement of the present application, the top and bottom of the buoyancy cage frame are fixedly connected with a clamp, the clamp is arranged in a semicircular shape, and the two ends of the two sets of clamps in the same horizontal plane are bolted together. The two buoyancy cage frames are combined on the outside of the foundation pile through the clamp, which effectively improves the installation stability of the test device.

[0010] As a further improvement of the present application, an extension tube is fixedly connected to the top of the through-lumen tube, and a movable groove corresponding to the floating block bracket is opened on the top of the extension tube. The extension tube is utilized to provide protection for the top of the through-lumen tube, effectively preventing seawater from entering the buoyancy chamber from the vent hole, and the floating block bracket can be easily extended into the extension tube through the movable groove.

[0011] As a further improvement of the present application, the top end of the extension tube is fixedly connected with a pad, the top end of the lifting column passes through the pad, and the top end of the lifting column is fixedly connected with a top plate, a spring is provided between the top plate and the pad, and the spring is utilized to realize automatic rising of the lifting column, that is, automatic closing of the air vent and the water hole by the air blocking plug and the water blocking plug.

[0012] As another improvement of the present application, a safety lock pin is inserted in the middle of the movable groove, and a pin hole is opened in the middle of the float block bracket. The safety lock pin is plugged into the pin hole and corresponds to the pin hole. The float block bracket is fixed by plugging the safety lock pin into the pin hole, thereby preventing the reference float block and the float block bracket from affecting the automatic sealing effect of the air blocking plug and the water blocking plug on the lifting column on the air vent and the water hole during the lifting process of the test device.

[0013] As another improved supplement of the present application, the water-blocking plug is composed of a plug bubble wrapped by a plug body inside the plug body, the plug body is made of stainless steel material, and the plug bubble is made of rubber material. The combination of the plug bubble and the plug body effectively improves the sealing effect of the water-blocking plug on the water hole.

[0014] As another improvement supplement of the present application, the outside of the plug body is provided with annularly distributed shrinkage grooves, and a connecting groove is provided between the middle parts of the shrinkage grooves. When the plug bubble is deflated, the plug bubble at the shrinkage groove lacks support, forming a space for water to pass through.

[0015] As another improvement of the present application, an opening and closing air pipe is fixedly connected to the top of the water-blocking bubble, and the opening and closing air pipe extends through the top of the buoyancy chamber. The inflation and deflation of the water-blocking bubble are achieved through the opening and closing air pipe, thereby effectively improving the control effect of the water-blocking plug.

[0016] As another improvement of the present application, a tank air pipe is fixedly connected to the top of the buoyancy tank, and the opening and closing air pipe is fixedly connected in parallel with the tank air pipe. The tank air pipe is used to transport air into the buoyancy tank, thereby squeezing out the water in the buoyancy tank. The opening and closing air pipe is fixed in parallel with the tank air pipe, which facilitates the line layout and management of the opening and closing air pipe and the tank air pipe.

[0017] In summary, the present invention fixes the connecting bracket on the top of the pile to be tested, uses the hydraulic module to apply sinking pressure to the buoyancy cage frame, and presses the buoyancy chamber underwater, thereby using the reaction buoyancy generated by the buoyancy chamber to exert a pulling effect on the pile. The pile pull-out test structure is simple, which is convenient for rapid construction on the sea surface, and effectively improves the efficiency of the pull-out test. When the pile is pulled up, the buoyancy chamber rises with the pile, thereby reducing the pulling-up buoyancy on the pile, effectively preventing the pile from being over-pulled, thereby effectively avoiding the subsequent use of the pile. During the floating process of the buoyancy chamber, the lifting column in the cavity tube is affected by the buoyancy block bracket on the top of the reference buoyancy block and fails to rise together. Therefore, the air blocking plug and the water blocking plug open the air vent and the water through hole respectively, thereby realizing rapid water filling and exhaust in the buoyancy chamber, further reducing the buoyancy of the buoyancy chamber, thereby further preventing the pile from being over-pulled, and facilitating the subsequent installation and use of the pile. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a three-dimensional structural diagram of the first embodiment of the present application;

[0019] Figure 2 This is a demonstration diagram of the pull-out test of the first embodiment of the present application;

[0020] Figure 3 This is a cross-sectional three-dimensional structural diagram of the through-lumen tube in the first embodiment of the present application;

[0021] Figure 4 This is a three-dimensional structural diagram of a lifting column, a reference floating block and a floating block bracket according to the first embodiment of the present application;

[0022] Figure 5 This is a demonstration diagram of the opening changes of the vent hole and the water hole in the first embodiment of the present application;

[0023] Figure 6This is an enlarged view of the top of the lifting column in the first embodiment of the present application;

[0024] Figure 7 This is a cross-sectional three-dimensional structural diagram of a buoyancy tank in a second embodiment of the present application;

[0025] Figure 8 This is a cross-sectional three-dimensional structural diagram of a water blocking plug according to a second embodiment of the present application;

[0026] Fig. 9 This is a three-dimensional structural diagram of the plug body in the second embodiment of the present application;

[0027] Fig.10 This is a demonstration diagram of the deflated state of the plug in the second embodiment of the present application.

[0028] Description of the numbers in the figure:

[0029] 1. Foundation pile; 101. Connecting bracket; 102. Hydraulic module; 103. Buoyancy cage; 104. Clamp; 2. Buoyancy chamber; 201. Through-hole; 202. Air vent; 203. Water vent; 204. Lifting column; 205. Air block; 206. Water block; 207. Wave block; 208. Reference float; 209. Float bracket; 210. One-way gear; 211. Extension tube; 212. Movable groove; 213. Pad; 214. Top plate; 215. Spring; 216. Safety lock pin; 217. Pin hole; 3. Plug bubble; 301. Opening and closing air pipe; 302. Chamber air pipe; 4. Plug body; 401. Shrinking groove; 402. Connecting groove. DETAILED DESCRIPTION

[0030] Two implementation modes of the present application are described in detail below with reference to the accompanying drawings.

[0031] The first implementation method:

[0032] Figure 1-2 It is shown that an anti-pulling test device for offshore wind power piles comprises a connecting bracket 101 sleeved on the top of the pile 1, both ends of the connecting bracket 101 are fixedly connected with hydraulic modules 102, the output end of the hydraulic module 102 is fixedly connected with a buoyancy cage frame 103, the interior of the buoyancy cage frame 103 is movably connected with a buoyancy chamber 2, the top and bottom of the buoyancy cage frame 103 are fixedly connected with a clamp 104, the clamp 104 is arranged in a semicircular shape, and the two ends of the two groups of clamps 104 in the same horizontal plane are bolted, and the two buoyancy cage frames 103 are combined on the outside of the pile 1 through the clamp 104, which effectively improves the installation stability of the test device;

[0033] When conducting a pull-out test on the foundation pile 1, the test device hoists the connecting bracket 101 to the top of the foundation pile 1 through the tower crane equipment on the ship, connects and fixes it, gathers the two buoyancy cage frames 103 on both sides of the foundation pile 1, and combines them with the clamp 104 to realize the construction of the test device. Then, the hydraulic module 102 applies a sinking pressure to the buoyancy cage frame 103, and presses the buoyancy chamber 2 into the water, so as to use the reaction buoyancy generated by the buoyancy chamber 2 to exert a pull-out effect on the foundation pile 1, thereby effectively improving the efficiency of the pull-out test.

[0034] Figure 3-5 As shown, the outside of the buoyancy chamber 2 is fixedly connected to a through-cavity tube 201, and a vent hole 202 and a water hole 203 are respectively provided at the top and bottom of the through-cavity tube 201, and a lifting column 204 is movably sleeved inside the through-cavity tube 201, and an air blocking plug 205 and a water blocking plug 206 are respectively fixedly connected to the top and bottom of the lifting column 204, and the air blocking plug 205 and the water blocking plug 206 correspond to the vent hole 202 and the water hole 203 respectively, and a wave blocking cylinder 207 is fixedly connected to the outside of the through-cavity tube 201, and a reference floating block 208 is sleeved inside the wave blocking cylinder 207, and a floating block bracket 209 is fixedly connected to the top of the reference floating block 208, and the top of the floating block bracket 209 is sleeved with the top of the lifting column 204, and the sleeve connection part of the floating block bracket 209 and the lifting column 204 is rotatably connected with a one-way gear 210, and the one-way gear 210 is meshed with the top of the lifting column 204;

[0035] When the pile 1 is lifted due to the buoyancy of the buoyancy chamber 2, the buoyancy chamber 2 rises with the pile 1, thereby reducing the lifting buoyancy on the pile 1 and effectively preventing the pile 1 from being overlifted. During the sinking of the buoyancy chamber 2, the reference buoy 208 in the wave-blocking tube 207 floats on the sea surface, and the wave-blocking tube 207 isolates the influence of the waves on the reference buoy 208. The sinking of the buoyancy chamber 2 drives the lifting column 204 to pass through the buoy bracket 209, and the one-way gear 210 allows The lifting column 204 is allowed to descend and pass through. During the floating process of the buoyancy chamber 2, the one-way gear 210 prevents the lifting column 204 from ascending, and the lifting column 204 fails to rise with the buoyancy chamber 2. Therefore, the air blocking plug 205 and the water blocking plug 206 open the air vent 202 and the water through hole 203 respectively, thereby realizing rapid water filling and exhaust in the buoyancy chamber 2, further reducing the buoyancy of the buoyancy chamber 2, thereby further preventing the excessive lifting of the foundation pile 1, and facilitating the subsequent installation and use of the foundation pile 1.

[0036] Figure 4-6As shown, the top of the through-cavity tube 201 is fixedly connected with an extension tube 211, and a movable groove 212 corresponding to the floating block bracket 209 is opened on the top of the extension tube 211. The extension tube 211 is used to provide protection for the top of the through-cavity tube 201, effectively preventing seawater from entering the buoyancy chamber 2 from the vent 202. The floating block bracket 209 is conveniently extended into the extension tube 211 through the movable groove 212. The top of the extension tube 211 is fixedly connected with a pad 213, and the top of the lifting column 204 passes through the pad 213, and the top of the lifting column 204 is fixedly connected with a top plate 214, and a spring 215 is sleeved between the top plate 214 and the pad 213, and the spring 215 is used to realize The automatic rise of the lifting column 204 realizes the automatic closing of the air vent 202 and the water hole 203 by the air blocking plug 205 and the water blocking plug 206. A safety lock pin 216 is inserted in the middle of the movable groove 212, and a latch hole 217 is opened in the middle of the floating block bracket 209. The safety lock pin 216 is plugged into and corresponds to the latch hole 217. The safety lock pin 216 is plugged into the latch hole 217 to fix the floating block bracket 209, thereby preventing the floating block bracket 209 and the floating block bracket 209 from affecting the automatic closing effect of the air blocking plug 205 and the water blocking plug 206 on the lifting column 204 on the air vent 202 and the water hole 203 during the hoisting process of the test device;

[0037] The extension tube 211 provides protection for the top of the through-lumen tube 201, effectively preventing seawater from entering the buoyancy chamber 2 from the vent hole 202. The float bracket 209 extends into the through-lumen tube 201 through the movable groove 212. The spring 215 realizes the automatic rise of the lifting column 204, that is, the automatic closure of the vent hole 202 and the water hole 203 by the air blocking plug 205 and the water blocking plug 206. When the test device is in a hoisting state and the buoyancy chamber 2 has not sunk to a suitable depth, the safety lock pin 216 is connected with the pin hole 217 to fix the float bracket 209. The reference float 208 and the float bracket 209 affect the automatic closure effect of the air blocking plug 205 and the water blocking plug 206 on the lifting column 204 on the vent hole 202 and the water hole 203.

[0038] The second implementation method:

[0039] Compared with the first embodiment, this embodiment mainly adds a plug bulb 3 and a plug body 4. The specific newly added structure is as follows, and the remaining structure is consistent with the first embodiment.

[0040] Figure 7-10As shown, the water blocking plug 206 is composed of a plug bulb 3 and a plug body 4 covering the inside thereof, the plug body 4 is made of stainless steel material, and the plug bulb 3 is made of rubber material. The combination of the plug bulb 3 and the plug body 4 effectively improves the sealing effect of the water blocking plug 206 on the water through hole 203. The outside of the plug body 4 is provided with a ring-shaped shrinking groove 401, and a connecting groove 402 is provided between the middle parts of the shrinking groove 401. When the plug bulb 3 is deflated, the plug bulb 3 at the shrinking groove 401 lacks support, forming a space for water to pass through, and the top of the plug bulb 3 is fixedly connected with an opening and closing The air pipe 301 extends through the top of the buoyancy chamber 2. The air inflating and deflating of the plug bubble 3 is realized through the air inflating and deflating air pipe 301, which effectively improves the control effect of the water blocking plug 206. The top of the buoyancy chamber 2 is fixedly connected with a chamber air pipe 302. The air inflating and deflating air pipe 301 is parallel and fixedly connected with the chamber air pipe 302. The chamber air pipe 302 is used to transport air into the buoyancy chamber 2, thereby squeezing out the water in the buoyancy chamber 2. The air inflating and deflating air pipe 301 is parallel and fixedly connected with the chamber air pipe 302, which is convenient for the line layout and management of the air inflating and deflating air pipe 301 and the chamber air pipe 302.

[0041] When the buoyancy chamber 2 is drained and inflated separately, the opening and closing air pipe 301 is first used to deflate the plug bubble 3 to achieve the deflation and shrinkage of the plug bubble 3, so that the originally expanded plug bubble 3 is tightly attached to the plug body 4, and the shrinkage groove 401 on the plug body 4 forms a space for water to pass when the plug bubble 3 shrinks. The connecting groove 402 connects the shrinkage grooves 401 to facilitate the discharge of the gas inside the plug bubble 3, and then the chamber air pipe 302 transports air into the buoyancy chamber 2, thereby squeezing out the water in the buoyancy chamber 2 to finely enhance the buoyancy effect of the buoyancy chamber 2. Conversely, the chamber air pipe 302 inhales the buoyancy chamber 2, and sucks seawater into the buoyancy chamber 2 to finely reduce the buoyancy effect of the buoyancy chamber 2.

[0042] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims

1. A pull-out test device for offshore wind power piles, characterized in that: It comprises a connection bracket (101) sleeved on the top of a foundation pile (1), both ends of the connection bracket (101) are fixedly connected to a hydraulic module (102), the output end of the hydraulic module (102) is fixedly connected to a buoyancy cage frame (103), and the interior of the buoyancy cage frame (103) is movably connected to a buoyancy chamber (2); The buoyancy chamber (2) is fixedly connected to the outside of the buoyancy chamber (2) with a through-cavity tube (201), the top and bottom of the through-cavity tube (201) are respectively provided with an air vent (202) and a water through-cavity hole (203), the inside of the through-cavity tube (201) is movably sleeved with a lifting column (204), the top and bottom of the lifting column (204) are respectively fixedly connected with an air blocking plug (205) and a water blocking plug (206), the air blocking plug (205) and the water blocking plug (206) corresponding to the air vent (202) and the water through-cavity hole (203), respectively. The outside of the through-cavity tube (201) is fixedly connected to a wave-blocking tube (207), the inside of the wave-blocking tube (207) is sleeved with a reference float (208), the top of the reference float (208) is fixedly connected to a float bracket (209), the top of the float bracket (209) is sleeved with the top of the lifting column (204), and the sleeve connection part between the float bracket (209) and the lifting column (204) is rotatably connected to a one-way gear (210), and the one-way gear (210) is meshed with the top of the lifting column (204); The top end of the through-cavity tube (201) is fixedly connected to an extension tube (211), the top of the extension tube (211) is provided with a movable groove (212) corresponding to the floating block bracket (209) passing through, the top end of the extension tube (211) is fixedly connected to a pad (213), the top end of the lifting column (204) passes through the pad (213), and the top end of the lifting column (204) is fixedly connected to a top plate (214), a spring (215) is sleeved between the top plate (214) and the pad (213), a safety lock pin (216) is inserted in the middle of the movable groove (212), a pin hole (217) is provided in the middle of the floating block bracket (209), and the safety lock pin (216) is connected to the bottom of the movable groove (212). The plug hole (217) is plugged in correspondence, the water blocking plug (206) is composed of a plug bubble (3) and a plug body (4) covering the inside thereof, the plug body (4) is made of stainless steel material, the plug bubble (3) is made of rubber material, the outside of the plug body (4) is provided with annularly distributed shrinking grooves (401), the middle of the shrinking grooves (401) is provided with a connecting groove (402), the top of the plug bubble (3) is fixedly connected with an opening and closing air pipe (301), the opening and closing air pipe (301) passes through the top of the buoyancy bin (2) and extends out, the top of the buoyancy bin (2) is fixedly connected with a bin air pipe (302), the opening and closing air pipe (301) is fixedly connected with the bin air pipe (302) in parallel.

2. The pull-out test device for offshore wind power piles according to claim 1, characterized in that: The top and bottom of the buoyancy cage frame (103) are both fixedly connected with a clamp (104), the clamp (104) is arranged in a semicircular shape, and two ends of two groups of clamps (104) on the same horizontal plane are bolted together.

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