Orifice pipe imbedding method under deepwater condition and orifice pipe buoy device

Abstract

The invention relates to the technical field of deepwater grouting, and particularly discloses an orifice pipe imbedding method and an orifice pipe buoy device under the deepwater condition. The orifice pipe buoy device comprises two symmetrically arranged buoyancy mechanisms and further comprises a connecting piece; the connecting piece comprises a rotating piece, an annular seat, an arc-shaped fixing piece and an elastic clamping piece; the two arc-shaped fixing pieces are detachably connected and fixed to the steel pipe. The elastic clamping piece is arranged on the inner side of the arc-shaped fixing piece; a second inclined surface is formed on the upper outer wall of the elastic clamping piece; the annular seat is detachably connected with the arc-shaped fixing piece; the rotating piece is in threaded connection with the annular seat; a first inclined surface is arranged on the inner side of the lower part of the rotating part; when the rotating piece moves downwards, the elastic clamping piece is hooped at the joint of the two steel pipes; the buoyancy mechanisms are detachably fixed to the connecting pieces, and the two buoyancy mechanisms define an annular cylinder. The problems that an existing buoyancy device has large resistance under water flow, and the perpendicularity of an orifice pipe cannot be ensured can be solved.

Description

Technical Field

[0001] The invention relates to the technical field of deepwater grouting, and in particular to a borehole pipe casting method and a borehole pipe buoy device under deepwater conditions. Background Art

[0002] After a period of long-term operation, hydropower stations and reservoir dams will produce certain leakage, and the leakage location is underwater. Underwater leakage control can usually be treated by grouting. In order to ensure the economic benefits of reservoirs and hydropower stations and the working condition that the reservoir cannot be emptied, grouting operations are usually adopted under water storage conditions.

[0003] In order to ensure that the grouting materials do not enter the water body in deep water areas, a large-diameter orifice pipe (a geological steel pipe with a larger diameter than the drill pipe) is usually installed in the rock formation to the surface platform, and the drilling and grouting operations are completed directly in the orifice pipe.

[0004] The orifice pipe is tens of meters long in the water, so the orifice pipe is usually connected by multiple geological steel pipes. In order to reduce the influence of the weight of the orifice pipe on its stability, the prior art usually sets a buoy at the connection of the geological steel pipe, such as a buoyancy device for deep water grouting disclosed in CN206358332U, which detachably connects two detachably connected square cavity buoyancy mechanisms at the connection of the steel pipe; although the buoyancy of the buoyancy device can be used to reduce the sinking weight of the orifice pipe in the water, thereby reducing the bearing force at the connection, the two square cavity buoyancy mechanisms are connected by arranging wing plates on both sides, and the wing plates are connected with bolts to realize the connection of the two square cavity buoyancy mechanisms, but the wing plates have greater resistance under water flow, resulting in a greater influence of water flow on the square cavity buoyancy device, and the verticality of the orifice pipe cannot be ensured as time goes by. Summary of the invention

[0005] The object of the present invention is to provide an orifice tube buoy device to solve the problem that the existing buoyancy device has a large resistance under water flow and cannot ensure the verticality of the orifice tube.

[0006] In addition, the present invention also provides a method for casting a hole-mouth tube under deep water conditions based on the hole-mouth tube buoy device.

[0007] The present invention is achieved through the following technical solutions:

[0008] An orifice tube buoy device comprises two symmetrically arranged buoyancy mechanisms and a connecting member; the connecting member comprises a rotating member, an annular seat, an arc-shaped fixing member and an elastic clamping member;

[0009] Two arc-shaped fixing members are provided, and the two arc-shaped fixing members are detachably connected and fixed on the steel pipe;

[0010] The elastic clamp is arranged on the inner side of the arc-shaped fixing member, and the upper outer wall of the elastic clamp is arranged to form a second inclined surface;

[0011] The annular seat is detachably connected to the arc-shaped fixing piece;

[0012] The rotating member is threadedly connected to the annular seat, and the rotating member can be moved up and down relative to the annular seat by rotating the rotating member; a first inclined surface matching the second inclined surface is provided on the inner side of the lower part of the rotating member;

[0013] When the rotating part moves downward, the elastic clamp is clamped tightly at the connection of the two steel pipes;

[0014] The buoyancy mechanism is detachably fixed on the connecting piece, and the two buoyancy mechanisms form an annular cylinder.

[0015] The buoyancy mechanism of the present invention abandons the method of setting wing plates on the outer wall of the traditional square cavity to realize the fixing of two buoyancy mechanisms on the steel pipe. The two buoyancy mechanisms of the present invention form an annular cylinder. Under the action of the same water flow, the annular cylinder has smaller resistance and adaptability to complex directional water flow than the buoyancy device in CN206358332U, reducing the problem of reduced verticality of the orifice pipe due to greater resistance of the buoyancy device, that is, the orifice pipe buoy device of the present invention provides buoyancy for the orifice pipe. On the one hand, the buoyancy of multiple orifice pipe buoy devices is used in a segmented manner to counteract the self-gravity of the long orifice pipe, avoiding the instability and bending of the long orifice pipe due to its own weight, thereby ensuring its verticality; on the other hand, the buoyancy mechanism of the annular cylinder reduces the problem of reduced verticality due to the deviation of the orifice pipe caused by the greater resistance of the complex directional water flow to the buoyancy device, thereby ensuring the verticality of the orifice pipe when the orifice pipe buoy device of the present invention is used.

[0016] The present invention fixes the buoyancy mechanism on the orifice pipe by arranging a connecting piece built into the inner side of the buoyancy mechanism. The connecting piece is fixed to the orifice pipe by an elastic clamping piece, and the elastic clamping piece elastically compresses the connection of the orifice pipe while fixing the connecting piece on the orifice pipe. The connection of the orifice pipe can be further reinforced without affecting the mechanical properties of the connection of the orifice pipe, thereby improving the stability of the orifice pipe. The present invention can avoid the problem of breakage of the connection of the orifice pipe by arranging the buoyancy mechanism.

[0017] A semicircular cavity is formed in the semicircular shell;

[0018] The air inlet pipe and the drain pipe are both connected to the semicircular cavity. The air inlet pipe is used to introduce gas into the semicircular cavity, and the drain pipe is used to discharge liquid in the semicircular cavity.

[0019] A top cover and a bottom plate are respectively arranged on the top and bottom of the semicircular shell; the inner sides of the top cover and the bottom plate both protrude from the semicircular shell, so that a space for accommodating the connecting piece is formed between the top cover and the bottom plate.

[0020] The structural improvement of the buoyancy mechanism of the present invention is adapted to the structure of the connecting piece.

[0021] In a preferred embodiment, after the two buoyancy mechanisms are fixed on the connecting member, the two buoyancy mechanisms are sealed and connected to each other, and the top cover and the bottom plate are both sealed and abutted against the steel pipe.

[0022] The above-mentioned structural arrangement of the present invention can form a closed space between the two buoyancy mechanisms, thereby reducing the effect of water in the water body entering between the two buoyancy mechanisms and causing the rotating member of the connecting member to rotate unsmoothly.

[0023] In a preferred embodiment, a curved plate is provided on the inner side of the top of the top cover, and the curved plate is elastic;

[0024] The two top covers form an annular plate with an inner diameter consistent with the outer diameter of the steel pipe;

[0025] A clamping piece is arranged on the top of the top cover, and the clamping piece is used to clamp and fix the arc plate on the outer wall of the steel pipe.

[0026] The above structure of the present invention can not only realize the sealed connection between the two top covers and the steel pipe, but also ensure the stability of the sealed connection between the top cover and the steel pipe through the provided clamping piece and the arc plate.

[0027] In a preferred embodiment, the clamping member includes a strip plate, a spring, a support rod and a clamping block;

[0028] The strip is fixed to the top of the top cover;

[0029] Two support rods are provided, and the two support rods are symmetrically arranged on both sides of the strip plate, one end of the support rod is hinged to the strip plate, and the other end is connected to the clamping block;

[0030] The two ends of the spring are respectively connected with two supporting rods. When working, the spring is in a stretched state. The restoring force of the spring is used to clamp the arc plate on the steel pipe with two clamping blocks.

[0031] The clamping member of the present invention has a simple structure, utilizes elastic restoring force, and adopts a two-point positioning method to clamp the arc plate on the steel pipe, thereby improving the sealing between the arc plate and the steel pipe.

[0032] In a preferred embodiment, the clamping block is an arc-shaped block that matches the arc-shaped plate.

[0033] In a preferred embodiment, a first connecting plate and a second connecting plate are provided on the inner side wall of the semicircular shell;

[0034] The arc-shaped fixing member is provided with a first fixing groove and a second fixing groove respectively matched with the first connecting plate and the second connecting plate.

[0035] In a preferred embodiment, a threaded through hole communicating with the second fixing groove is provided at the bottom of the arc-shaped fixing member, and the orifice tube buoy device also includes a fastening bolt; a threaded hole is provided on the second connecting plate, and the fastening bolt passes through the threaded through hole and is fixed in the threaded hole.

[0036] The present invention adopts a method of matching bolts with connecting plates, wherein the connecting plate is radially inserted into the arc-shaped fixing piece, and the fastening bolts are axially inserted into the arc-shaped fixing piece and connected to the second connecting plate, which can achieve locking of the second connecting plate to prevent it from being separated from the connecting piece under the impact of strong water flow, thereby improving the structural stability of the buoyancy mechanism connected to the connecting piece.

[0037] In a preferred embodiment, the longitudinal section of the arc-shaped fixing member is an L-shaped structure, a limit plate is provided on the inner wall of the arc-shaped fixing member, and the lower part of the elastic clamp is provided between the limit plate and the horizontal section of the L-shaped structure.

[0038] The above arrangement of the present invention can improve the stability of the elastic clamping piece being fixed to the inner side of the arc-shaped fixing piece.

[0039] A method for casting a borehole pipe under deep water conditions comprises the following steps:

[0040] S1. Preparation before drilling: including construction preparation, setting up the water surface operation platform, clearing the siltation layer and determining the exact location of the drilling hole;

[0041] S2, lowering the drill rod with the drill bit section by section, and pulling the drill rod to the positioning steel bar with the help of the underwater robot, and then continue to lower the drill rod so that the drill bit is placed on the positioning steel bar and start drilling;

[0042] S3. After completing a section of drilling, pull out all the drill rods, check the core sample to determine the geological conditions of the stratum in that section, check or replace the drill bit, and install an inflatable capsule at the planned position at the bottom of the drill rod hole;

[0043] S4, lowering the airbag device and the drill rod from the water surface into the drilled hole, with a distance between the drill bit and the bottom of the hole;

[0044] S5. After the airbag is inflated and stuck in the hole, grout is poured from the drill pipe. Grouting is stopped when the hole section does not take grout. After a period of grouting, the airbag is deflated and taken out. The operator on the surface platform starts to drill downward. When the hole reaches the predetermined depth, drilling is stopped and the drill pipe is lifted.

[0045] S6. Connect the steel pipes section by section to form an orifice pipe, and install the orifice pipe buoy device at the orifice pipe connection according to the planned spacing, so that the buoyancy mechanism is filled with liquid; then lower the orifice pipe from the water surface into the hole; directly install the orifice sealer at the orifice pipe mouth for grouting, close the orifice sealer valve after the grout is no longer absorbed, and wait for solidification for three days;

[0046] S7. Adjacent orifice pipes are reinforced in a mutually restrained manner according to the needs of arranging drilling holes, and at the same time, the parts close to the shore are directly connected to the shore for reinforcement; after the reinforcement is completed, the orifice pipe is cast.

[0047] In the above-mentioned orifice pipe casting method of the present invention, the problem of lifting the sealing device after grouting is completed and then lowering the drill rod to complete grouting is solved. The step of lifting the sealing device requires a diver to dive and cooperate in installing the sealing device, or the diver to dive and cut the pipeline to guide the drill rod; at the same time, the orifice pipe is segmentedly resisted against its own gravity by multiple buoy devices, and the elastic clamp of the connecting piece is used to further reinforce the connection of the orifice pipe to ensure its verticality. At the same time, the coordinated reinforcement between the orifice pipes also ensures its verticality.

[0048] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0049] The present invention fixes the buoyancy mechanism on the orifice pipe by setting a connector built inside the buoyancy mechanism, abandoning the method of fixing the two buoyancy mechanisms on the steel pipe by setting a wing plate on the outer wall of the square cavity. The two buoyancy mechanisms of the present invention form an annular cylinder, which has small water flow resistance and adaptability to complex directional water flow. On the one hand, the orifice pipe buoy device of the present invention uses the buoyancy of multiple orifice pipe buoy devices to resist the self-gravity of the long orifice pipe in a segmented manner, avoids the long orifice pipe from being unstable and bent due to its own weight, and ensures its verticality; on the other hand, the buoyancy mechanism of the annular cylinder reduces the problem of the orifice pipe being deviated and the verticality being reduced because the buoyancy device is subjected to large resistance from complex directional water flow, so that the orifice pipe buoy device of the present invention can ensure the verticality of the orifice pipe when it is used; the connector of the present invention is fixed to the orifice pipe by the elastic clamp, and the elastic clamp elastically compresses the connection of the orifice pipe, and the mechanical properties of the connection of the orifice pipe are not affected, so the connection of the orifice pipe can be further reinforced, which can improve the stability of the orifice pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings:

[0051] Figure 1 It is a schematic diagram of the orifice tube buoy device of the present invention installed at the connection of the steel pipe;

[0052] Figure 2 for Figure 1 A partial enlarged view of the middle A;

[0053] Figure 3 This is a schematic diagram of the connector of the present invention installed at the connection of a steel pipe;

[0054] Figure 4is a top view of the top cover of the present invention;

[0055] Figure 5 It is a schematic structural diagram of the clamping member of the present invention.

[0056] Marks and corresponding parts names in the attached drawings:

[0057] 1- buoyancy mechanism;

[0058] 11-semicircular shell; 12-top cover; 13-bottom plate; 14-semicircular cavity; 15-intake pipe; 16-drain pipe; 17-arc plate; 18-first connecting plate; 19-second connecting plate;

[0059] 2-Connectors;

[0060] 21-rotating member; 22-annular seat; 23-arc-shaped fixing member; 24-elastic clamp;

[0061] 211 - first inclined surface; 221 - clamping block; 222 - annular protrusion; 231 - first fixing groove; 232 - second fixing groove; 233 - threaded through hole; 234 - limiting plate; 241 - second inclined surface;

[0062] 3- Tighten the bolts;

[0063] 4- Clamping piece;

[0064] 41-strip plate; 42-spring; 43-support rod; 44-clamping block;

[0065] 5- Constraint components;

[0066] 100-Steel pipe. DETAILED DESCRIPTION

[0067] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the embodiments. The schematic implementation mode of the present invention and its description are only used to explain the present invention and are not intended to limit the present invention. The embodiments described below are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0068] In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the present invention. However, it is apparent to those of ordinary skill in the art that these specific details do not have to be employed to practice the present invention. In other embodiments, in order to avoid confusing the present invention, known structures, materials or methods are not specifically described. The materials, instruments and reagents used in the following examples, unless otherwise specified, can be obtained from commercial sources. The technical means used in the examples, unless otherwise specified, are conventional means well known to those skilled in the art.

[0069] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0070] Embodiment 1:

[0071] like Figure 1-Figure 5 As shown, in order to solve the problems that the existing buoyancy device has large resistance under water flow, cannot ensure the verticality of the orifice tube, and the orifice tube is broken at the connection, the present embodiment is an orifice tube buoy device, including two symmetrically arranged buoyancy mechanisms 1, and also includes a connecting member 2 for installing the buoyancy mechanism 1 on the steel pipe 100; the connecting member 2 is fixed to the steel pipe 100 and built between the two buoyancy mechanisms 1, so as to fix it from the inside of the buoyancy mechanism 1, and can avoid the method of setting a wing plate on the outside of the buoyancy mechanism 1 to achieve fixation. Specifically, the connecting member 2 includes a rotating member 21, an annular seat 22, an arc-shaped fixing member 23 and an elastic clamp 24;

[0072] Two arc-shaped fixing members 23 are provided, and the two arc-shaped fixing members 23 are detachably connected and fixed on the steel pipe 100; specifically, the two arc-shaped fixing members 23 can be connected by clamps or bolts to form an annular member fixed on the steel pipe 100. Preferably, an annular support member can be further provided below the connection of the two steel pipes 100 on the outside of the steel pipe 100. The annular support member is used to limit the downward displacement of the arc-shaped fixing members 23, thereby improving the stability of the two arc-shaped fixing members 23 fixed on the steel pipe 100. The annular support member can specifically be an annular protrusion formed by welding, or elastic plastic, etc.

[0073] The elastic clamp 24 is arranged inside the arc-shaped fixing member 23, and the upper outer wall of the elastic clamp 24 is arranged as a second inclined surface 241; specifically, the elastic clamp 24 can be arranged one-to-one with the arc-shaped fixing member 23, and more specifically, the elastic clamp 24 has an arc-shaped bottom plate, and one or two gripping petals whose inner walls match the outer wall of the steel pipe 100 are arranged on the arc-shaped bottom plate, and the upper outer wall of the gripping petals forms a second inclined surface 241. When the two arc-shaped fixing members 23 are connected, the two arc-shaped bottom plates abut against each other, just forming an annular plate whose inner diameter is consistent with the outer diameter of the steel pipe 100, and there is a circumferential spacing between two adjacent gripping petals, wherein the second inclined surface 241 can be understood as when the two arc-shaped fixing members 23 are connected, the upper inner diameter of the annular member surrounded by multiple gripping petals tends to gradually decrease from bottom to top. The elastic clamp 24 can be made of plastic, and can be silicone.

[0074] In a specific case, the longitudinal section of the arc-shaped fixing member 23 is an L-shaped structure, a limiting plate 234 is provided on the inner wall of the arc-shaped fixing member 23, the arc-shaped bottom plate of the elastic clip 24 is provided between the limiting plate 234 and the horizontal section of the L-shaped structure, the side wall of the L-shaped structure radially limits the arc-shaped bottom plate, and the limiting plate 234 and the horizontal section of the L-shaped structure radially limit the arc-shaped bottom plate; the stability of the elastic clip 24 provided on the inner side of the arc-shaped fixing member 23 is improved.

[0075] The annular seat 22 is detachably connected to the arc-shaped fixing member 23; specifically, a clamping block 221 is provided at the bottom of the annular seat 22, a groove for embedding the clamping block 221 is provided at the top of the arc-shaped fixing member 23, an annular protrusion 222 is provided on the inner wall of the annular seat 22, and a first thread is provided on the inner side surface of the annular protrusion 222.

[0076] The rotating member 21 is threadedly connected to the annular seat 22, and the rotating member 21 can be moved up and down relative to the annular seat 22 by rotating it; a first inclined surface 211 matching with the second inclined surface 241 is provided on the inner side of the lower part of the rotating member 21; specifically, the rotating member 21 includes an annular side plate, the outer wall of the annular side plate is provided with a second thread matching with the first thread, and the lower part of the inner wall of the annular side plate is provided with a first inclined surface 211, that is, the lower inner diameter of the annular side plate tends to gradually increase from top to bottom. When the rotating member 21 rotates and moves downward, the diameter difference between the first inclined surface 211 and the second inclined surface 241 is utilized to make the lower part of the rotating member 21 produce a radial extrusion force on the grabbing petal of the elastic clamp 24, so that the grabbing petal of the elastic clamp 24 is clamped on the steel pipe 100, and the grabbing petal and the lower part of the arc-shaped fixing member 23 respectively clamp the two ends of the connection of the steel pipe 100, so as to fix the connecting member 2 at the connection of the steel pipe 100. The top of the annular side plate extends radially outward to form an annular platform, which is located above the annular seat 22 and can be used to realize the rotation of the rotating member 21 through external components. The rotating member 21 can be manually rotated, and a slot can also be provided on the annular platform. A round rod is inserted into the slot with an interference fit, and a force is applied to the round rod to rotate the rotating member 21. That is, the connector 2 of this embodiment can realize that when the rotating member 21 moves downward, the elastic clamp 24 is clamped tightly at the connection of the two steel pipes 100;

[0077] The buoyancy mechanism 1 is detachably fixed on the connecting member 2, and the two buoyancy mechanisms 1 form an annular cylinder, which has less resistance under water flow and adaptability to complex isotropic water flow.

[0078] In a specific case, the buoyancy mechanism 1 includes a semicircular shell 1, an air inlet pipe 15 and a drain pipe 16;

[0079] A semicircular cavity 14 is formed inside the semicircular shell 1; the semicircle here specifically means that the arc length of the semicircular shell 1 and the semicircular cavity 14 is a semicircle, but the radial length is less than the diameter of the semicircle, so that when the two buoyancy mechanisms 1 are connected, a circular channel is formed between the two semicircular shells 1, which can be used to pass the steel pipe 100 and accommodate the connecting piece 2.

[0080] The air inlet pipe 15 and the drain pipe 16 are both connected to the semicircular cavity 14. The air inlet pipe 15 is used to introduce gas into the semicircular cavity 14, and the drain pipe 16 is used to discharge liquid in the semicircular cavity 14, which can be water. The air inlet pipe 15 is provided with a first valve, and the drain pipe 16 is provided with a second valve. The first valve and the second valve are both communicated with the controller. When the controller controls the first valve and the second valve to open, gas is introduced into the semicircular cavity 14 through the air inlet pipe 15, and pressure is applied to the semicircular cavity 14. The liquid in the semicircular cavity 14 is discharged from the semicircular cavity 14 through the drain pipe 16 by the air pressure, and the buoyancy of the buoyancy mechanism 1 in water is controlled by controlling the weight of the liquid in the semicircular cavity 14; the top and bottom of the semicircular shell 1 are respectively provided with a top cover 12 and a bottom plate 13; the inner sides of the top cover 12 and the bottom plate 13 protrude from the semicircular shell 1, so that a space for accommodating the connector 2 is formed between the top cover 12 and the bottom plate 13.

[0081] In a preferred case, in order to improve the sealing performance of the orifice tube buoy device of the buoyancy mechanism 1 and prevent water from affecting the smooth use of the rotating parts of the connecting member 2, after the two buoyancy mechanisms 1 are fixed on the connecting member 2, the two buoyancy mechanisms 1 are sealed and connected. Specifically, a sealing strip can be provided on one side where the two buoyancy mechanisms 1 are connected, and both the top cover 12 and the bottom plate 13 are sealed against the steel pipe 100. Specifically, a sealing strip can be provided on the inner side walls of the top cover 12 and the bottom plate 13. Preferably, in order to improve the connection stability of the two buoyancy mechanisms 1, at least two constraint components 5 are provided on the top of the top cover 12, and constraint components 5 are provided on both sides of the steel pipe 100, wherein the constraint component 5 includes two ear plates, the two ear plates are respectively placed on the tops of the two top covers 12, and the two ear plates are fastened and connected by bolts.

[0082] In a specific case, a first connecting plate 18 and a second connecting plate 19 are provided on the inner wall of the semicircular shell 1; the first connecting plate 18 and the second connecting plate 19 are arranged up and down, and preferably, the second connecting plate 19 corresponds to the horizontal section of the L-shaped structure; the arc-shaped fixing member 23 is provided with a first fixing groove 231 and a second fixing groove 232 respectively matching with the first connecting plate 18 and the second connecting plate 19. When the buoyancy mechanism 1 is fixed on the connecting member 2, the first connecting plate 18 is inserted into the first fixing groove 231 with an interference fit, and the second connecting plate 19 is inserted into the second fixing groove 232 with an interference fit, and the first connecting plate 18 and the second connecting plate 19 are used to connect the buoyancy mechanism 1 and the connecting member 2 in the radial direction.

[0083] In a preferred case, a threaded through hole 233 connected to the second fixing groove 232 is provided at the bottom of the arc-shaped fixing member 23, and the orifice tube buoy device also includes a fastening bolt 3; a threaded hole is provided on the second connecting plate 19, and the fastening bolt 3 passes through the threaded through hole 233 and is fixed in the threaded hole, and the fastening bolt 3 is used to limit the radial displacement of the second connecting plate 19, thereby improving the stability of the connection between the buoyancy mechanism 1 and the connecting member 2.

[0084] The working process of this embodiment is:

[0085] First, fix the two arc-shaped fixing members 23 on the steel pipe 100, and the contact position between the arc-shaped fixing members 23 and the steel pipe 100 is lower than the connection between the two steel pipes 100; at this time, the elastic clamp 24 is attached to the outside of the connection between the two steel pipes 100, but the elastic clamp 24 has no clamping effect on the connection between the steel pipes 100, and then the annular seat 22 with the rotating member 21 threadedly connected is put on the steel pipe 100 from one end of the steel pipe 100 to move the annular seat 22 until the annular seat 22 is connected to the two arc-shaped fixing members 23 to form a whole, and then rotate the rotating member 21 to move the rotating member 21 downward so that the elastic clamp 24 clamps the connection between the two steel pipes 100; then fix the two buoyancy mechanisms 1 filled with liquid on the two arc-shaped fixing members 23 respectively.

[0086] The present embodiment fixes the buoyancy mechanism 1 on the orifice tube by providing a connector 2 built into the inner side of the buoyancy mechanism 1, abandoning the method of providing a wing plate on the outer wall of the traditional square cavity to fix the two buoyancy mechanisms 1 on the steel pipe 100. The two buoyancy mechanisms 1 of the present embodiment form an annular cylinder, which has a smaller water flow resistance and adaptability to complex directional water flow. On the one hand, the orifice tube buoy device of the present embodiment utilizes the buoyancy of multiple orifice tube buoy devices in a segmented manner to counteract the gravity of the long orifice tube itself, thereby avoiding the instability and bending of the long orifice tube caused by its own weight and ensuring its verticality. On the other hand, the buoyancy mechanism of the annular cylinder reduces the problem of the orifice tube being deviated and the verticality being reduced due to the large resistance of the buoyancy device to the complex directional water flow, thereby ensuring the verticality of the orifice tube when the orifice tube buoy device of the present embodiment is used.

[0087] In addition, the connector 2 of this embodiment is provided with an elastic clamp 24, which can elastically compress the connection of the orifice pipe while fixing the connector 2 on the orifice pipe. The connection of the orifice pipe can be further reinforced without affecting the mechanical properties of the connection of the orifice pipe, thereby improving the stability of the orifice pipe.

[0088] Embodiment 2:

[0089] like Figure 1-Figure 5As shown, this embodiment is based on the embodiment 1, and an arc plate 17 is arranged on the inner side of the top of the top cover 12, and the arc plate 17 is elastic; the arc plate 17 can be made of plastic or silicone. The two top covers 12 form an annular plate whose inner diameter is consistent with the outer diameter of the steel pipe 100;

[0090] A clamping member 4 is provided on the top of the top cover 12 , and the clamping member 4 is used to clamp and fix the arc plate 17 to the outer wall of the steel pipe 100 .

[0091] In a specific case, the clamping member 4 includes a strip plate 41, a spring 42, a support rod 43 and a clamping block 44; the strip plate 41 is fixed to the top of the top cover 12; two support rods 43 are provided, and the two support rods 43 are symmetrically arranged on both sides of the strip plate 41, one end of the support rod 43 is hinged to the strip plate 41, and the other end is connected to the clamping block 44; the two ends of the spring 42 are respectively connected to the two support rods 43, and when working, the spring 42 is in a stretched state, and the restoring force of the spring 42 is used to make the two clamping blocks 44 clamp the arc plate 17 on the steel pipe 100. Preferably, the clamping block 44 is an arc block that matches the arc plate 17.

[0092] The clamping member 4 of this embodiment has a simple structure, and utilizes the restoring force of the spring 42 to clamp the arc plate 17 on the steel pipe 100 in a two-point positioning manner, thereby improving the sealing between the arc plate 17 and the steel pipe 100.

[0093] Embodiment 3:

[0094] A method for casting a borehole pipe under deep water conditions comprises the following steps:

[0095] S1. Preparation before drilling: including construction preparation, setting up water surface operation platform, clearing siltation layer and determining the exact location of drilling hole; specifically:

[0096] S11. Construction preparation: including the positioning of drilling rigs and construction equipment, the entry of construction personnel and the determination of drilling locations;

[0097] S12. Set up a water surface operation platform on the water surface of the dam, and use a surveying instrument to measure the hole position, which is the projection of the drilling hole position designed for underwater curtain grouting on the operation platform. Install a drilling rig and a drilling tower at the hole position;

[0098] S13. Divers go into the water to investigate the sediment layer in the underwater part of the drilling area. If the sediment thickness is thin, such as no more than 50cm, a high-pressure water gun is used to wash the sediment covering the upper part;

[0099] S14. Divers carry measuring devices with them when they dive to measure the corresponding positions of underwater holes and determine the exact positions of drilling holes through the relative positions of underwater structures. They then use underwater hammer drills to locate steel bars at these positions.

[0100] S2. Lower the drill rod with the drill bit section by section from the surface platform to the hole position, with the core drill rod at the front end and the conventional drill rod at the rear end. When it is almost close to the bottom of the water, use an underwater robot to grab the drill rod. After the underwater robot pulls the drill rod to the positioning steel bar, it continues to lower it so that the drill bit is placed on the positioning steel bar and drilling begins.

[0101] S3. After completing a section of drilling, pull up all the drill rods, check the core sample to determine the geological conditions of the stratum in this section, check or replace the drill bit, and install an inflatable capsule on the drill rod 1.9m back from the drill bit. The airbag is about 50-60cm long and has its own inflation nozzle. The inflation nozzle is connected to the inflation pipeline with a pneumatic clamping device, and the pneumatic clamping device is pulled by a wire rope.

[0102] S4. Lower the airbag device and the drill rod from the water surface into the drilled hole. An underwater robot can be used to guide the drill rod into the hole accurately. The drill bit should be no more than 50 cm away from the bottom of the hole.

[0103] S5. After the airbag is inflated and stuck in the hole, grout is poured from the drill pipe. Grouting is stopped when the hole section is no longer filled with grout. After a period of time, the pneumatic clamping device loosens the air nozzle to separate the air pipe from the air nozzle. The airbag is deflated and returns to its original state. The surface platform staff connects the pneumatic clamping device to the air pipe and takes them out of the water. The surface platform staff continues to drill downwards. When the hole reaches the predetermined depth, drilling is stopped and the drill pipe is lifted.

[0104] Steps S4-S5 solve the problem that after the grouting is completed, the sealing device needs to be lifted and then the drill rod is lowered to complete the grouting. The step of lifting the sealing device requires a diver to dive to cooperate in installing the sealing device, or the diver to dive to cut the pipeline to guide the drill rod.

[0105] S6. A certain number of small holes are regularly arranged on the first section of the orifice pipe. Hemp is wound around the top of the orifice pipe 500cm backward. The hemp winding is cone-shaped as a whole and cellulose ether, polyacrylamide or sodium alginate, etc. need to be added during the hemp winding process. The steel pipe 100 is connected section by section to form an orifice pipe. Specifically: the subsequent direct connection of each section of the orifice pipe is connected by threaded connection and welding reinforcement is required. At the same time, the spare parts are reinforced according to the preset welding part, and the orifice pipe buoy device as described in Example 1 or Example 2 is installed on the connection of the orifice pipe at the planned interval, so that the buoyancy machine 1 is filled with liquid; then the orifice pipe is lowered from the water surface to the hole section by section. When the end enters the hole, an underwater robot can be used for guidance. Because the orifice pipe is stuck in the hole due to the hemp, the orifice sealer is directly installed at the orifice pipe mouth for grouting. After the slurry is no longer absorbed, the orifice sealer valve is closed and solidified for three days.

[0106] S7. Adjacent orifice pipes are reinforced in a mutually restrained manner according to the needs of arranging drilling holes, and at the same time, the parts close to the shore are directly connected to the shore for reinforcement; after the reinforcement is completed, the orifice pipe is cast.

[0107] The above specific implementation methods further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above are only specific implementation methods of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0108] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and the like cited in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of the relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

Claims

1. An orifice tube buoy device, comprising two symmetrically arranged buoyancy mechanisms (1), characterized in that: It also includes a connecting member (2); the connecting member (2) includes a rotating member (21), an annular seat (22), an arc-shaped fixing member (23) and an elastic clamp (24); Two arc-shaped fixing members (23) are provided, and the two arc-shaped fixing members (23) are detachably connected and fixed on the steel pipe (100); The elastic clamp (24) is arranged on the inner side of the arc-shaped fixing member (23), and the upper outer wall of the elastic clamp (24) is arranged to form a second inclined surface (241); The annular seat (22) is detachably connected to the arc-shaped fixing member (23); The rotating member (21) is threadedly connected to the annular seat (22), and the rotating member (21) can be moved up and down relative to the annular seat (22) by rotating the rotating member (21); a first inclined surface (211) matching with the second inclined surface (241) is provided on the inner side of the lower part of the rotating member (21); When the rotating member (21) moves downward, the elastic clamp (24) is clamped tightly at the connection point of the two steel pipes (100); The buoyancy mechanism (1) is detachably fixed on the connecting member (2), and the two buoyancy mechanisms (1) form an annular cylinder.

2. The orifice tube buoy device according to claim 1, characterized in that: The buoyancy mechanism (1) comprises a semicircular shell (1), an air inlet pipe (15) and a drainage pipe (16); A semicircular cavity (14) is formed in the semicircular shell (1); The air inlet pipe (15) and the drain pipe (16) are both in communication with the semicircular cavity (14); the air inlet pipe (15) is used to introduce gas into the semicircular cavity (14); and the drain pipe (16) is used to discharge liquid in the semicircular cavity (14); The top and bottom of the semicircular shell (1) are respectively provided with a top cover (12) and a bottom plate (13); the inner sides of the top cover (12) and the bottom plate (13) both protrude from the semicircular shell (1), so that a space for accommodating the connecting member (2) is formed between the top cover (12) and the bottom plate (13).

3. The orifice tube buoy device according to claim 2, characterized in that: When the two buoyancy mechanisms (1) are fixed on the connecting member (2), the two buoyancy mechanisms (1) are sealed and connected to each other, and the top cover (12) and the bottom plate (13) are both sealed and abutted against the steel pipe (100).

4. The orifice tube buoy device according to claim 2, characterized in that: An arc-shaped plate (17) is arranged on the inner side of the top of the top cover (12), and the arc-shaped plate (17) is elastic; The two top covers (12) form an annular plate whose inner diameter is consistent with the outer diameter of the steel pipe (100); A clamping piece (4) is provided on the top of the top cover (12), and the clamping piece (4) is used to clamp and fix the arc-shaped plate (17) on the outer wall of the steel pipe (100).

5. The orifice tube buoy device according to claim 4, characterized in that: The clamping member (4) comprises a strip plate (41), a spring (42), a support rod (43) and a clamping block (44); The strip plate (41) is fixed on the top of the top cover (12); Two support rods (43) are provided, and the two support rods (43) are symmetrically arranged on both sides of the strip plate (41); one end of the support rod (43) is hinged to the strip plate (41), and the other end is connected to the clamping block (44); The two ends of the spring (42) are respectively connected to the two support rods (43). When working, the spring (42) is in a stretched state. The restoring force of the spring (42) is used to enable the two clamping blocks (44) to clamp the arc plate (17) onto the steel pipe (100).

6. The orifice tube buoy device according to claim 5, characterized in that: The clamping block (44) is an arc-shaped block that matches the arc-shaped plate (17).

7. The orifice tube buoy device according to claim 2, characterized in that: A first connecting plate (18) and a second connecting plate (19) are provided on the inner side wall of the semicircular shell (1); The arc-shaped fixing member (23) is provided with a first fixing groove (231) and a second fixing groove (232) respectively matching with the first connecting plate (18) and the second connecting plate (19).

8. The orifice tube buoy device according to claim 7, characterized in that: A threaded through hole (233) communicating with the second fixing groove (232) is provided at the bottom of the arc-shaped fixing member (23), and the orifice tube buoy device also includes a fastening bolt (3); a threaded hole is provided on the second connecting plate (19), and the fastening bolt (3) passes through the threaded through hole (233) and is fixed in the threaded hole.

9. The orifice tube buoy device according to claim 2, characterized in that: The longitudinal section of the arc-shaped fixing member (23) is an L-shaped structure, the inner wall of the arc-shaped fixing member (23) is provided with a limiting plate (234), and the lower part of the elastic clamping member (24) is arranged between the limiting plate (234) and the horizontal section of the L-shaped structure.

10. A method for casting a borehole pipe under deep water conditions, characterized in that: The following steps are involved: S1. Preparation before drilling: including construction preparation, setting up the water surface operation platform, clearing the siltation layer and determining the exact location of the drilling hole; S2, lowering the drill rod with the drill bit section by section, and pulling the drill rod to the positioning steel bar with the help of the underwater robot, and then continue to lower the drill rod so that the drill bit is placed on the positioning steel bar and start drilling; S3. After completing a section of drilling, pull out all the drill rods, check the core sample to determine the geological conditions of the stratum in that section, check or replace the drill bit, and install an inflatable capsule at the planned position at the bottom of the drill rod hole; S4, lowering the airbag device and the drill rod from the water surface into the drilled hole, with a distance between the drill bit and the bottom of the hole; S5. After the airbag is inflated and stuck in the hole, grout is poured from the drill pipe. Grouting is stopped when the hole section does not take grout. After a period of grouting, the airbag is deflated and taken out. The operator on the surface platform starts to drill downward. When the hole reaches the predetermined depth, drilling is stopped and the drill pipe is lifted. S6, connecting the steel pipes (100) section by section to form an orifice pipe, and installing the orifice pipe buoy device as described in any one of claims 1 to 9 at the orifice pipe connection according to the planned spacing, so that the buoyancy mechanism (1) is filled with liquid; then lowering the orifice pipe from the water surface into the hole; directly installing an orifice sealer at the orifice pipe orifice to perform grouting, closing the orifice sealer valve after the grout is no longer absorbed, and waiting for solidification for three days; S7. Adjacent orifice pipes are reinforced in a mutually restrained manner according to the needs of arranging drilling holes, and at the same time, the parts close to the shore are directly connected to the shore for reinforcement; after the reinforcement is completed, the orifice pipe is cast.

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