Rotary drilling process in pile foundation construction

Abstract

The application discloses a rotary drilling process in pile foundation construction, which is used for underwater drilling and comprises the following steps: according to a drilling torque, a drilling cylinder corresponding to the drilling torque is assembled, and specifically, the length and the inner diameter of the drilling cylinder are adjusted to correspond to the drilling torque; along the bottom of the drilling cylinder, the rolling cutters arranged in an inclined mode or a vertical mode are assembled in units to form a rolling cutter surface; a drill rod is connected to the upper part of the drilling cylinder through a drill rod connecting sleeve; on the outer side of the drilling cylinder, a flow guide assembly is assembled with the rolling cutters as the starting position; the drill rod is started, the rolling cutters drill a core column along the wall of the drilling cylinder while the drill rod rotates, water on the outer side of the drilling cylinder moves upwards along the flow guide assembly, and a vortex is formed at the top, and water at the top flows downwards along the inner wall of the drilling cylinder under the action of gravity to form a water circulation path; when the water moves upwards, the water carries away the broken stones generated when the rolling cutters are broken under the action of the vortex, and a moving channel is formed at the vortex for the flow of the broken stones. The application realizes the drilling of the whole core column.

Description

Technical Field

[0001] This invention relates to the field of drilling technology in pile foundation construction, and more particularly to rotary drilling technology in pile foundation construction. Background Technology

[0002] Since its invention, the rotary drilling rig has experienced rapid development due to its advantages such as wide applicability, high efficiency, and environmental friendliness. In just twenty years, the specifications of rotary drilling rigs have become increasingly larger, with supporting drilling tools such as augers, sand buckets, and tubular drills. However, in current technology, when drilling through high-strength rock formations such as granite and fine sandstone during pile foundation construction, it is difficult to achieve whole-core excavation. In particular, there is a continuous accumulation of gravel on the outer side of the borehole. The accumulation of gravel not only affects drilling on the outer side, but also, once the gravel enters the drill tub, it cannot be cleaned in time, thus affecting the structure of the whole core. Summary of the Invention

[0003] The purpose of this invention is to provide a rotary drilling process for pile foundation construction. By adding a flow guiding component and cooperating with the drilling rod, the gravel generated during construction can be cleaned up in a timely manner, thereby avoiding the interference of gravel on the core. This allows the entire rock block to be drilled into a large core column, which is then removed as a whole, achieving the effect of drilling by "turning fragments into a whole".

[0004] To achieve the above-mentioned technical effects, the present invention is implemented through the following technical solutions.

[0005] Rotary drilling technology in pile foundation construction, used for underwater drilling, includes the following steps.

[0006] According to the drilling torque, assemble the corresponding drill barrel, specifically by adjusting the length and inner diameter of the drill barrel to correspond to the drilling torque;

[0007] Along the bottom of the drill barrel, hobs that are set at an angle or vertically are assembled in groups to form hob cutter surfaces;

[0008] A drill rod is connected to the upper part of the drill barrel via a drill rod connecting sleeve;

[0009] On the outside of the drill barrel, with the starting position above the hob cutter, install the flow guide assembly;

[0010] Start the drill rod. As the drill rod rotates, the cutter drills the core column along the drill barrel wall. At the same time, the water on the outside of the drill barrel moves from bottom to top along the guide assembly and forms a vortex at the top. Meanwhile, the water at the top flows from top to bottom along the inner wall of the drill barrel under the action of gravity, forming a water circulation path. At the same time, the crushed stone is collected by the collection assembly at the top of the drill barrel.

[0011] As the water moves from bottom to top, it carries away the gravel produced by the roller cutter under the action of the eddy current. At the same time, a moving channel is formed at the eddy current for the flow of gravel.

[0012] As a further improvement of the application, the flow guide assembly forms a guiding track from bottom to top, which makes the water at the bottom move upward under force, and in turn drives the broken stones produced during the breaking of the roller cutter to move upward.

[0013] As a further improvement of the application, the flow guide assembly is a spiral structure arranged upward, and the spiral structure forms a guiding track, which makes the water at the bottom of the drill cylinder change from a horizontal state to a spiral distribution state.

[0014] As a further improvement of the application, a plurality of spiral channels are formed in the spiral structure, and the water at the bottom of the drill cylinder continuously enters the spiral channels during the rotation of the spiral structure, so that the water and the broken stones in the spiral channels generate vortexes to form upward disturbance.

[0015] As a further improvement of the application, a drainage surface is formed on the spiral structure, the drainage surface is a downward curved arc surface, and when the drill rod rotates, the drainage surface generates a centrifugal force, so that the water and the broken stones on the drainage surface generate a centrifugal force for upward movement.

[0016] As a further improvement of the application, when the water moves upward along the flow guide assembly, the water and the broken stones form a plurality of flow layers connected in sequence along the outer side of the drill cylinder, and the flow layers form a protective layer outside the drill cylinder.

[0017] As a further improvement of the application, during the operation of the drill rod, the flow guide assembly forms a drainage space between the drill cylinder and the surface to be drilled.

[0018] As a further improvement of the application, each group of roller cutters includes at least three roller cutters, which are sequentially arranged in the direction of inclination toward the inner wall of the drill cylinder, perpendicular to the drill cylinder, and inclination toward the outer wall of the drill cylinder, and during the operation of the drill rod, the roller cutter surfaces form an annular gap, and the drill cylinder is located between the inner circle and the outer circle of the annular gap.

[0019] As a further improvement of the application, the drill cylinder is spliced by steel plates, and thickened steel plates are selected near the roller cutters to strengthen the welding of the roller cutters.

[0020] As a further improvement of the application, the collection assembly is arranged at the top of the drill cylinder, and a filter assembly for filtering the broken stones is further arranged at the top of the drill cylinder.

[0021] The beneficial effects of the application are as follows:

[0022] The flow guide structure in the application has the following effects: 1. forming vortex, using the vortex to timely take away the broken stones broken by the rolling cutter; 2. providing a moving channel for large broken stones (under the action of the vortex); 3. increasing the strength and stability of the drill cylinder (the torsional strength of the drill cylinder); 4. avoiding the abrasion between the drill cylinder and the hole wall.

[0023] In the application, compared with other constructions, the broken stones can be timely mixed with water in a circulating flow manner, and the broken stones generated can be timely collected, and the water in the drill cylinder forms clean water, and the clean water is circulated again to take away the broken stones, and the multiple circulation flows finally complete the collection of all the broken stones, reducing the influence on the drilling. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 The flow chart of the rotary drilling process in the pile foundation construction provided by the application is provided.

[0025] Figure 2 The front view of the drill cylinder provided by the application is provided.

[0026] Figure 3 The assembly drawing of the guide assembly and the drill cylinder provided by the application is provided.

[0027] Figure 4 The assembly drawing of the rolling cutter assembly and the filter plate provided by the application is provided.

[0028] In the drawings:

[0029] 10, drill cylinder; 20, filter assembly; 30, drill rod connecting sleeve; 40, collection assembly; 50, flow guide assembly; 51, flow guide surface; 60, rolling cutter; 61, rolling cutter surface. DETAILED DESCRIPTION

[0030] The application will be described in detail below in combination with the embodiments shown in the drawings, but it should be noted that these embodiments are not a limitation on the application, and equivalent transformations or substitutions of the function, method or structure made by those skilled in the art according to these embodiments are within the protection scope of the application.

[0031] In the description of the present embodiment, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0032] The terms "mounting", "connecting", "connection", "relative fixing" should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present invention can be understood according to the specific circumstances.

[0033] Referring to the drawings Figures 1-4 As shown in the figure, the rotary drilling process in pile foundation construction is used for underwater drilling, which comprises the following steps,

[0034] According to the drilling torque, the drilling cylinder 10 corresponding to the drilling torque is assembled, specifically the length and inner diameter of the drilling cylinder 10 are adjusted to correspond to the drilling torque; specifically, the length and diameter of the drilling cylinder are adjusted to form an adjustable structure by using the assembled structure.

[0035] Along the bottom of the drilling cylinder 10, the tilt or vertical setting of the cutter 60 is assembled in groups to form the cutter surface 61;

[0036] The drill rod is connected to the upper part of the drilling cylinder 10 through the drill rod connecting sleeve 30 (not shown in the figure);

[0037] On the outside of the drilling cylinder 10, the flow guide assembly 50 is assembled starting from above the cutter 60;

[0038] Start the drill rod, while the drill rod rotates, the cutter 60 drills the core column along the wall of the drilling cylinder 10, at the same time, the water outside the drilling cylinder 10 moves from bottom to top along the flow guide assembly 50, and forms a vortex at the top, at the same time, the water at the top flows from top to bottom along the inner wall of the drilling cylinder 10 under the action of gravity to form a water circulation path, and the broken stones are collected by the collecting assembly 40 at the top of the drilling cylinder 10;

[0039] When the water moves from bottom to top, the water carries the broken stones produced by the cutter under the action of the vortex, and a moving channel is formed at the vortex for the flow of the broken stones.

[0040] When using the present application, first, the entire drilling cylinder 10 is adjustable, and it can meet the requirements of different construction environments, whether it is for a large hole, the length of the drilling cylinder can be modified by adjustment and assembly to improve the scope of application.

[0041] Secondly, in the present application, due to the increase of the flow guide assembly, compared with the direct construction of the drill rod, in the present embodiment, it is mainly used for underwater drilling, and can form a circulating water path, cooperate with filtering, etc., and the broken stones are carried away by water, then filtered and collected, which reduces the influence of the broken stones on the construction of the drilling.

[0042] Finally, in the drilling, the formed vortex is used for action, and it is known that the vortex can not only quickly suck the fluid at the outer periphery into the vortex center, but also can automatically suck the low water and gravel, thereby providing a basis for the later gravel collection.

[0043] In actual construction, the flow guide assembly 50 forms a downward guiding track, which makes the water at the bottom move upward under force, and then drives the gravel generated during the breaking of the cutter upward. The downward guiding track makes the bottom be lifted without adding too much external force, and the purpose of the guiding track is to make the water move along the track during lifting, thereby reducing the generation of random running, and then the water and gravel move regularly, which is more efficient than direct lifting, and the gravel will be separated from the water once there is no track, and even collide to affect the cutter and the drill cylinder.

[0044] Specifically, the flow guide assembly 50 is a spiral structure arranged upward, and the spiral structure forms a guiding track, so that the water at the bottom of the drill cylinder changes from a horizontal state to a spiral distribution state. In the embodiment, the spiral structure is selected, so that the water at the bottom changes from a vertical or horizontal state to a spiral distribution state through spiral guiding. Compared with the uncertain water near the drill rod, the state is more stable, and the water will not splash, thereby avoiding the rust of the cutter.

[0045] In the embodiment, a plurality of spiral channels are formed in the spiral structure, and the water at the bottom of the drill cylinder continuously enters the spiral channels during rotation of the spiral channels, so that the water and gravel in the spiral channels generate vortex to form upward disturbance. In the embodiment, the number of spiral channels is at least 5, so that the guiding track has a certain length, on the one hand, the guiding nature of water flow is increased, so that more water can enter the spiral channel and not be accumulated; on the other hand, the spiral channel is at least 5, so that the water in flow does not accumulate in the spiral channel, so that the water is always in a flowing state when the drill rod acts, and then the gravel is also always driven to flow, thereby avoiding the possibility that the water is accumulated to cause the gravel to be stationary or the gravity to act on the drill cylinder outside to move downward.

[0046] In order to make the water better upward movement, the spiral structure is formed with a drainage surface 51, the drainage surface 51 is downward curved arc surface, the drill rod rotates, the drainage surface 51 forms centrifugal force, so that the water and debris on the drainage surface 51 form the centrifugal force of upward movement. In this embodiment, the spiral structure itself has a certain centrifugal force when the drill rod moves and rotates, and the downward curved arrangement on the drainage surface avoids the possibility of water and debris flowing outward. If the drainage surface is upward or flat, the centrifugal force can easily make it fly out, and the downward arc surface makes the centrifugal force have a certain downward guide, so it will not fly out, or it will fly into the lower spiral structure downward, and then it will continue to rotate and be driven upward.

[0047] When the flow guide assembly 50 in this embodiment is in action, the water moves upward along the flow guide assembly 50, and the water and debris form a plurality of flow layers connected in sequence along the outside of the drill cylinder 10, and the flow layers form a protective layer outside the drill cylinder 10. In this embodiment, the flow layers at this time increase the strength and stability of the drill cylinder, and thus the torsional strength of the drill cylinder is increased.

[0048] Further, in order to avoid wear between the drill cylinder 10 and the hole wall, the flow guide assembly 50 forms a drainage space between the drill cylinder 10 and the hole wall to be drilled during the operation of the drill rod. This drainage space forms a gap between the drill cylinder and the hole wall, and the water flow also has less contact with the hole wall during the flow, thereby reducing wear.

[0049] During assembly, each group of rolling cutters includes at least three rolling cutters 60, which are assembled in the direction of inclination toward the inner wall of the drill cylinder 10, perpendicular to the drill cylinder 10, and inclination toward the outer wall of the drill cylinder 10 in sequence. During the operation of the drill rod, the rolling cutter surface 61 forms an annular gap, and the drill cylinder 10 is located between the inner and outer circles of the annular gap. In this embodiment, this arrangement further allows the drill cylinder to drill clockwise in the annular hole (from top to bottom), and the flow guide wing drives the water outside the drill cylinder wall to flow upward, so that the water in the drill cylinder flows downward. Therefore, as the drill cylinder continues to drill along the clockwise direction, a vortex is generated along the drill cylinder wall in the annular hole, and the vortex flows into the drill cylinder from the top of the drill cylinder, flows out from the bottom of the drill cylinder, and then flows back to the top of the drill cylinder along the outer wall of the drill cylinder under the action of the flow guide wing.

[0050] In this embodiment, in order to obtain better results, the rock breaking capacity of the rolling cutter is calculated, and the specific calculation is shown in Table 1.

[0051] Table 1: Rolling cutter rock breaking capacity calculation

[0052]

[0053] In this embodiment, 9 cutters are arranged in a 1.5m long drill cylinder, each cutter has 4 drill teeth contacting rock surface (breaking rock), the drill cylinder + drill rod weighs 35t, and can drill 190MPa rock.

[0054] In order to realize the arrangement of the drill cylinder, the drill cylinder 10 is spliced by steel plates, and thickened steel plates are selected near the cutters 60 to strengthen the welding of the cutters.

[0055] In order to collect the broken stones, the collecting assembly 40 is assembled on the top of the drill cylinder, and the top of the drill cylinder is also provided with a filtering assembly for filtering the broken stones.

[0056] Referring to the drawings Figures 2-4 In this embodiment, in order to realize the rotary drilling process, the drill cylinder and the like are used to form a drill, and the specific implementation is as follows:

[0057] The drill for drilling the core column in this embodiment comprises:

[0058] The drill cylinder 10;

[0059] The top of the drill cylinder 10 is assembled with a filter plate to form a filtering assembly 20, the drill rod connecting sleeve 30 and the slag collecting sleeve outside the drill rod connecting sleeve 30 are detachably assembled on the filter plate to form a collecting assembly 40, and the accommodating cavity formed by the slag collecting sleeve matches the filter plate, so that the filter plate forms the bottom plate of the accommodating cavity.

[0060] The flow guide assembly 50 is arranged along the outer wall of the drill cylinder 10 and the slag collecting sleeve, the flow guide assembly 50 forms an upward spiral track along the outer wall of the drill cylinder 10, and the spiral track extends from the bottom of the drill cylinder 10 to the top of the collecting assembly 40.

[0061] The cutter 60 forms a circular broken zone, the inner diameter of the circular ring is smaller than the inner diameter of the drill cylinder 10, and the outer diameter of the circular ring is larger than the outer diameter of the drill cylinder 10.

[0062] When the present application is used, the flow guide assembly 50 forms an upward spiral structure, and when the drill cylinder 10 rotates clockwise, the flow guide assembly 50 on the outside of the drill cylinder 10 forms an upward force, so that the water and waste slag in the water at the bottom can move upward along the drum, form a vortex structure at the top of the slag collecting sleeve, then pass through the top of the slag collecting sleeve into the slag collecting sleeve, and then the water moves downward, the filter plate leaves the filter slag, and flows to the bottom of the drill cylinder 10, then flows out, and then under the action of the spiral structure, a part of the waste slag moves upward, and the process is repeated and circulates many times, so that the first ground broken stones are directly stored in the movable slag collecting ring through the broken stone flow guide wing (flow guide structure), the drilling efficiency of high strength rock is improved, and the use range of the rotary drilling rig is widened.

[0063] Compared with the prior art, in the use of the present application, due to the generation of the vortex, long-term accumulation of the drilling sludge is avoided, and due to the large crushing area formed by the cutter assembly, good crushing effect can be achieved.

[0064] In the present embodiment, when the drill barrel is in operation, the spiral trajectory drives the water on the outer periphery of the drill barrel to move upward, so that the water on the outer wall of the drill barrel flows from below to at least the sludge collecting sleeve, and then forms a flow trajectory from top to bottom in the sludge collecting sleeve and the drill barrel.

[0065] Referring to FIG. 1, the present embodiment comprises a drill barrel 10, a sludge collecting sleeve 20, a guide assembly 50, a cutter assembly 60 and a core barrel 70. Figure 3 As shown in the figure, the guide assembly 50 in the present embodiment is assembled by guide wings, the guide wings form a plurality of spiral rings, and the spacing between the spiral rings is not less than 30 cm. In the present embodiment, the guide wings have a certain thickness variation, which can make the upward flow effect better in combination with resistance and the like, and the plurality of spiral rings make the water flow accumulate multiple times under the action of the rotating force, gradually sent high, and finally sent to the highest place.

[0066] Referring to FIG. 1, the present embodiment comprises a drill barrel 10, a sludge collecting sleeve 20, a guide assembly 50, a cutter assembly 60 and a core barrel 70. Figure 1 As shown in the figure, the guide wings in the present embodiment have an arc surface structure, and the arc surface extends downward from the drill barrel 10 to the edge of the guide wing. In the present embodiment, the upper surface of the guide wing has an arc surface structure, which makes the driving force of upward rotation larger with the change of thickness and the like when rotating, and thus can make the drilling sludge move upward with the water to achieve the final filtering.

[0067] In order to achieve better crushing, the cutter assembly 60 comprises at least three cutters, and the three cutters are respectively fixed in a perpendicular to the drill barrel 10, inclined toward the inside of the drill barrel 10 and inclined toward the outside of the drill barrel 10. In the present embodiment, the cutters are inclined in multiple directions, which has inclined cutting force compared with the single vertical, and is helpful for further drilling of the core column.

[0068] Preferably, the angle of the cutters inclined toward the inside of the drill barrel 10 and inclined toward the outside of the drill barrel 10 is 30°-40°. In the present embodiment, if the angle is less than 30°, the acute angle is too small, which is easy to affect the coring effect, and if the angle is greater than 40°, the whole crushing area becomes larger, which is easy to produce larger errors.

[0069] In actual use, the drill barrel 10 is spliced by steel plates, and the thickness of the drill barrel is 20-30 mm. In the present embodiment, the steel plates are spliced, the length and diameter of the drill barrel are determined according to the size of the rotary drilling rig (maximum drilling torque), the larger the drilling rig, the longer and larger the drill barrel can be made (for example, a 460 drilling rig is configured with a drill barrel with a diameter of 1.2 m and a length of 2.0 m), and the higher the core efficiency.

[0070] Further, the drill cylinder 10 bottom near the cutter assembly is provided with a reinforcing wall to form a thickened structure, the thickness of the reinforcing wall is 10-20mm. In this embodiment, the reinforcing wall is added, the purpose is to strengthen the drill bit welding connection effect, thereby avoiding falling in work.

[0071] In order to achieve good filter residue, a plurality of filter areas are provided on the filter plate, and a plurality of filter areas are arranged on the filter plate in a quincunx and radial manner. The radial arrangement makes the outer periphery of the filter effect good, and the outer side is mainly the area where the water with drill residue enters upwardly, so more filters are arranged here.

[0072] In order to better achieve the effect, the filter area is a step-up diameter structure with gradually increasing cross-sectional area width from inside to outside, and the diameter structure is formed by a plurality of filter holes. In this embodiment, the diameter structure makes the filter holes increase outwardly, and the water flows fast here, and the filter residue is left here.

[0073] Preferably, the drill rod connecting sleeve 30 in this embodiment is a square structure, and a drill rod fixing hole is formed in the upper part of the square structure. The square design in this embodiment can be used with various models of rotary drilling rigs. Before use, the drill rod fixing hole is matched with the hole of the rotary drilling rig drill rod to fix the rotary drilling rig and the drill cylinder.

[0074] The working process in this embodiment is as follows:

[0075] The drill cylinder 10 of the drill for drilling the core column in this embodiment is determined according to the size (maximum drilling torque) of the rotary drilling rig. The larger the drilling rig, the longer and larger the drill cylinder can be (such as a 460 drilling rig with a diameter of 1.2m and a length of 2.0m drill cylinder), and the higher the drilling efficiency. The drill cylinder of the drilling rig is made of 20-30mm thick wear-resistant steel plate, and the bottom opening steel plate is thickened to 30-40mm to strengthen the drill bit welding connection effect.

[0076] In order to break, in this embodiment, the cutter assembly is installed at the bottom of the drill cylinder 10 to form a cutter 60, and the cutter is composed of three cutters 60. Among the three cutters, the middle cutter is installed vertically (forward) to the drill cylinder 10, and the two cutters on both sides are installed at an angle of about 30°-40° to the inside and outside of the drill cylinder 10. The final goal is to realize that the three cutter groups can drill a circular gap slightly wider than the drill cylinder 10 wall along the drill cylinder 10 wall, so as to achieve the purpose of drilling the core column. The drill cylinder bottom is evenly distributed at an angle of 120°, and the three cutter groups have a total of 9 cutters. When the three cutter assemblies are welded, the welding angle of each group of cutters needs to be consistent to realize the uniform stress of the three cutter groups.

[0077] The guide assembly 50 is welded to the outer wall of the drill cylinder 10 next to the trailing edge of each set of roller cutter assembly, the guide wing is 15cm wide, made of 20 thick steel plate, three guide wings are spirally ascending along the outer wall of the drill cylinder (from top to bottom) counterclockwise until the top of the drill cylinder, the spiral interval is preferably 30cm. When the drill cylinder 10 drills in the annular hole (from top to bottom) clockwise, the guide wing drives the water outside the wall of the drill cylinder 10 to flow from bottom to top, thus the water in the drill cylinder 10 flows from top to bottom; therefore, as the drill cylinder 10 keeps drilling along the clockwise direction, the vortex is generated along the wall of the drill cylinder 10 in the annular hole, the vortex flows into the drill cylinder 10 from the top of the drill cylinder 10, flows out from the bottom of the drill cylinder 10 and then flows back to the top of the drill cylinder 10 along the outer wall of the drill cylinder 10 under the action of the guide wing.

[0078] In the embodiment, the filter hole with small diameter (20mm) is opened in the plum blossom shape at the top of the drill cylinder, and the removable slag collecting sleeve is installed at the top of the drill cylinder during drilling, the slag collecting sleeve is made of 20mm steel plate, the outer diameter is consistent with the diameter of the drill cylinder 10, the height is preferably 0.5-0.7m, the outer wall of the slag collecting sleeve is also welded with the guide wing, and the guide wing of the slag collecting sleeve 10 needs to be ensured to be connected with the guide wing of the drill cylinder 10. The slag collecting sleeve is fixed by clamping the reinforcing plate at the top of the drill cylinder 10. During drilling, the vortex carries the drill stones drilled by the roller cutter to the top of the drill cylinder 10 along the guide wing, and the drill stones are filtered by the filter hole at the top of the drill cylinder 10 and remain in the slag collecting sleeve. When the drill stones in the slag collecting sleeve are almost full after drilling to a certain depth, the drill cylinder 10 is taken out of the hole, the slag collecting sleeve is removed, the drill stones are unloaded, and then the slag collecting sleeve is installed again to restore the core column drilling.

[0079] The drill rod connecting sleeve 30 in the embodiment is designed in square shape, can be used with various models of rotary drilling rig, and is matched with the hole of the drill rod of the rotary drilling rig through the drill rod fixing hole before use, so as to fix the rotary drill rod and the drill cylinder.

[0080] Compared with the structure in the prior art, the structure in the application first uses the principle that the spiral structure can form upward spiral force, so that the water with drill slag at the bottom can be carried upward, and the whole water flow forms a circulating structure, the water with drill slag moves from bottom to top, then enters the slag collecting sleeve through the vortex at the top, moves from top to bottom, and is filtered through the filter hole 22, so that the working efficiency is better.

[0081] The series of detailed descriptions listed above are only specific descriptions of the feasible embodiments of the application, and are not used to limit the protection scope of the application, and equivalent embodiments or changes made without departing from the spirit of the application should be included in the protection scope of the application.

[0082] It will be obvious to a person skilled in the art that the application is not limited to the details of the foregoing exemplary embodiments and can be implemented in other concrete forms without departing from the spirit or essential characteristics of the application. The embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference signs in the claims should not be construed as limiting the claims concerned.

[0083] Furthermore, it should be understood that although the description is made on the basis of the embodiments, not every embodiment contains only one independent technical solution, and the description is made in this way only for the sake of clarity, and a person skilled in the art should consider the description as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by a person skilled in the art.

Claims

1. A rotary drilling technology for pile foundation construction, used for underwater drilling, characterized in that, Includes the following steps, According to the drilling torque, assemble the corresponding drill barrel, specifically by adjusting the length and inner diameter of the drill barrel to correspond to the drilling torque; Along the bottom of the drill barrel, hobs that are set at an angle or vertically are assembled in groups to form hob cutter surfaces; A drill rod is connected to the upper part of the drill barrel via a drill rod connecting sleeve; On the outside of the drill barrel, with the starting position above the hob cutter, install the flow guide assembly; The flow guiding assembly is assembled from flow guiding wings. The upper surface of the flow guiding wings has an arc surface structure, which extends downward from the drill barrel to the edge of the flow guiding wings. Start the drill rod. As the drill rod rotates, the cutter drills the core column along the drill barrel wall. At the same time, the water on the outside of the drill barrel moves from bottom to top along the guide assembly and forms a vortex at the top. Meanwhile, the water at the top flows from top to bottom along the inner wall of the drill barrel under the action of gravity, forming a water circulation path. At the same time, the crushed stone is collected by the collection assembly at the top of the drill barrel. The collection component is assembled on the top of the drill barrel, and the top of the drill barrel is also provided with a filter component for filtering crushed stone. The filter plate forms the filter component, and the filter plate is provided with a plurality of filter areas, which are arranged radially on the filter plate in a quincunx pattern. As the water moves from bottom to top, it carries away the gravel produced by the roller cutter under the action of the eddy current. At the same time, a moving channel is formed at the eddy current for the flow of gravel. The flow guiding component is specifically an upward-facing spiral structure. The guiding trajectory formed by the spiral structure causes the water at the bottom of the drill barrel to change from a horizontal state to a spiral distribution state. Several interconnected spiral channels are formed in the spiral structure, and as the spiral channels rotate, water at the bottom of the drill barrel continuously enters the spiral channels, causing the water and gravel in the spiral channels to generate eddies and create upward disturbances. A flow guiding surface is formed on the spiral structure. The flow guiding surface is a downward-curved arc surface. When the drill rod rotates, the flow guiding surface generates centrifugal force, causing the water and gravel on the flow guiding surface to move upward due to centrifugal force.

2. The rotary drilling technology for pile foundation construction according to claim 1, characterized in that, The flow guiding component forms a bottom-up guiding trajectory, which causes the water at the bottom to move upward under force, thereby simultaneously driving the gravel generated during the roller crushing process to move upward.

3. The rotary drilling technology in pile foundation construction according to claim 2, characterized in that, As the water moves from bottom to top along the guide assembly, the water and gravel form several sequentially connected flow layers along the outside of the drill barrel, and the flow layers form a protective layer outside the drill barrel.

4. The rotary drilling technology for pile foundation construction according to claim 1, characterized in that, During the operation of the drill pipe, the flow guiding component forms a flow guiding space between the drill barrel and the surface to be drilled.

5. The rotary drilling technology for pile foundation construction according to claim 2, characterized in that, Each set of cutters includes at least three cutters, which are assembled in sequence in the directions of inclined towards the inner wall of the drill barrel, vertical towards the drill barrel, and inclined towards the outer wall of the drill barrel. When the drill rod is in operation, the cutter face forms an annular gap, and the drill barrel is located between the inner circle and the outer circle of the annular gap.

6. The rotary drilling technology for pile foundation construction according to claim 1, characterized in that, The drill barrel is made of steel plates spliced ​​together, and thicker steel plates are used near the cutter to strengthen the welding of the cutter.

Images