Drilling device for high-fill rock stratum drilling variable-diameter pile

Abstract

The utility model relates to a drilling device for a high-fill rock stratum drilling variable-diameter pile. Comprising a hollow drill rod, the bottom of the hollow drill rod is connected with a bottom center drill bit through a hollow connecting part, a boot cutter telescopic unit capable of achieving stretching and retracting of a boot cutter is arranged in the hollow connecting part, a boot cutter fixing and guiding unit is arranged outside the hollow connecting part, and a boot cutter inlet and outlet is formed in the hollow connecting part; a boot sleeve is arranged on the boot knife fixing and guiding unit corresponding to the boot knife inlet and outlet; the utility model has the characteristics of simple structure, reduced operation cost, good rigidity of the boot knife and capability of meeting drilling operation.

Description

TECHNICAL FIELD

[0001] The utility model relates to variable diameter pile technical field, specifically a kind of drilling device for high fill rock stratum drilling variable diameter pile. BACKGROUND

[0002] When carrying out engineering project construction in mountainous or hilly areas, since the ground or terrain is rugged and uneven, it is generally necessary to carry out fill construction on the pothole section on the ground, and various sandstone, sand, stone, concrete, soil and the like are generally used as fill material. In order to enable the high fill section to have sufficient structural strength, the section needs to be repeatedly rolled and rammed, and a layered rolling and ramming construction method is usually used to overcome the problems of deep buried bedrock, weak rock stratum, low bearing capacity and large compression deformation of the high fill foundation. Further, when construction is needed in an old mining area, the fill material is generally obtained from the mountain rock material, and the lower part is rock stratum. Based on this, it is difficult to use precast piles or composite foundation piles due to the large amount of rock in the upper part, and the lower part is rock stratum, and the expansion drill bit often has insufficient rigidity, which causes the defect of drilling difficulty.

[0003] Therefore, how to realize variable diameter drilling under the condition that the upper fill material is mountain rock material and the lower part is rock stratum to improve the bearing capacity of the pile foundation has become a technical problem to be solved. CONTENT OF THE UTILITY MODEL

[0004] In order to make up for the above shortcomings, the utility model provides a kind of drilling device for high fill rock stratum drilling variable diameter pile to solve the technical problems existing in the prior art.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] A kind of drilling device for high fill rock stratum drilling variable diameter pile, the drilling device includes hollow drill rod, hollow drill rod bottom is connected with bottom center drill bit by hollow connecting part, the inside of hollow connecting part is provided with the boot knife extension unit capable of realizing boot knife extension and retraction, the outside of hollow connecting part is provided with boot knife fixed guide unit, boot knife inlet and outlet are provided on hollow connecting part, boot sleeve is provided on the boot knife fixed guide unit corresponding to boot knife inlet and outlet.

[0007] The utility model discloses a beneficial effect is: through setting hollow connecting portion not only can realize the connection of hollow drill rod and bottom center drill bit, can also set the boot cutter telescopic unit conveniently, to realize the protection of boot cutter telescopic unit, avoid the inside of boot cutter telescopic unit to enter the sandstone and influence its normal operation, further, through setting boot cutter telescopic unit and boot cutter fixed guide unit can realize the boot cutter is guided while improving the strength of boot cutter, thereby satisfying the drilling of mountain rock material and rock bed, the utility model is applicable to the drilling operation of the working condition that the upper backfill soil layer is the upper body rock material, and the lower natural soil layer is mainly weathered rock bed, and the pile hole presents the characteristics that the upper diameter is small and the lower diameter is big, to reach the characteristics of increasing side friction resistance and end resistance and making the pile foundation more firm and reliable.

[0008] Preferably, the boot cutter telescopic unit comprises a hollow vertical support rod arranged in the hollow drill rod.

[0009] Preferably, the telescopic piece comprises an inclined support rod, one end of the inclined support rod is hingedly connected with the bottom of the hollow vertical support rod, the other end of the inclined support rod is movably hingedly connected with one end of the horizontal support rod and the tail end of the boot cutter respectively; the other end of the horizontal support rod is movably connected with the bottom of the center pull rod, and the center pull rod extends through the inside of the hollow vertical support rod and reaches the upper portion of the hollow drill rod.

[0010] Preferably, the boot cutter is a plurality of, when the boot cutter is extended, it is evenly distributed on the upper portion of the bottom center drill bit, and the front end of the boot cutter extends to the outside of the center drill bit.

[0011] Preferably, the boot cutter and the inclined support rod and the horizontal support rod are in one-to-one correspondence.

[0012] Preferably, the bottom of the hollow vertical support rod is hingedly connected with one end of the plurality of inclined support rods, and the other end of the plurality of horizontal support rods is movably connected with the bottom of the center pull rod.

[0013] Preferably, the boot cutter fixed guide unit comprises a boot sleeve capable of freely entering and exiting when the boot cutter is telescoped, an arc-shaped hoop is arranged between adjacent boot sleeves, and the bottom of the arc-shaped hoop is arranged on the top of the center drill bit.

[0014] Preferably, the inner side of the arc-shaped hoop is connected with the inner wall of the hollow connecting portion.

[0015] The high fill rock stratum drilling variable-diameter pile drilling device prepared according to the above scheme, since the working condition is relatively special, the essence is to improve the rigidity of the shoe cutter to meet the requirements of the drilling operation, the variable-diameter drilling operation is realized by setting the shoe sleeve to guide and position the shoe cutter to improve the rigidity of the shoe cutter to meet the requirements, further, the shoe cutter can be controlled to be extended and retracted by setting the telescopic member, and the structural strength is improved by using the stable characteristics of the triangular structure to improve the rigidity of the shoe cutter, further, the rigidity of the shoe cutter is improved by setting the arc-shaped hoop 9 to improve the rigidity of the shoe cutter, and the structure is simple, the operation cost is reduced, the rigidity of the shoe cutter is good, and the drilling operation can be met. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of these drawings.

[0017] Fig. 1 It is a structural schematic diagram of the present application.

[0018] Fig. 2 It is a position relationship schematic diagram of the arc-shaped hoop and the hollow connecting part of the present application.

[0019] In the figure: 1, hollow drill rod; 2, bottom center drill bit; 3, shoe cutter; 4, shoe sleeve; 5, hollow vertical support rod; 6, inclined support rod; 7, horizontal support rod; 8, center pull rod; 9, arc-shaped hoop; 10, hollow connecting part. DETAILED DESCRIPTION

[0020] The technical scheme in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0021] The following will be combined with the drawings Figs. 1-2Further detailed description of the present application, the utility model relates to a kind of drilling device for high fill rock stratum bored pile variable diameter pile, the drilling device includes hollow drill rod 1, hollow drill rod 1 bottom is connected with bottom center drill bit 2 by hollow connecting portion 10, the inside of hollow connecting portion is equipped with the boot knife 3 that can realize the boot knife telescopic unit of extension and retraction, the outside of hollow connecting portion is equipped with boot knife fixed guide unit, hollow connecting portion is equipped with boot knife inlet and outlet, boot knife inlet and outlet corresponding boot knife fixed guide unit is provided with boot 4.The utility model is suitable for the working condition of the upper backfill soil layer being upper body rock stratum broken stone, lower natural soil layer is mainly weathered rock stratum to carry out variable diameter pile drilling operation, it is characterized in that structure firm, to improve the stiffness of boot knife 3, to realize the drilling operation to rock stratum broken stone and weathered rock stratum;The utility model connects hollow drill rod 1 with bottom center drill bit 2 by setting hollow connecting portion 10, and simultaneously still can improve the sealing property of boot knife telescopic unit, to reach the protection of boot knife telescopic unit and prolong its service life;The utility model is guided to the boot knife of extension by setting boot knife fixed guide unit, and the position is fixed simultaneously;Boot knife is avoided to appear left and right swing condition in the use process, to improve the stiffness of boot knife and guarantee the quality of pile hole;It needs to be noted that: hollow connecting portion 10 is closed structure with top and side opening, and the top opening of the same is adapted to hollow drill rod 1, for controlling the expansion and contraction of boot knife, the inside of hollow connecting portion 10 is cavity for installing boot knife telescopic unit, and the side of hollow connecting portion 10 is provided with boot knife inlet and outlet and matched with boot 4.

[0022] Further, the boot knife telescopic unit includes hollow upright strut 5 arranged in the inside of hollow drill rod 1, and the hollow upright strut 5 is connected with boot knife 3 by telescopic member.The telescopic member in the utility model can be conventional telescopic structure, such as hydraulic equipment controlled telescopic structure, electric push rod controlled telescopic structure, telescopic cylinder controlled telescopic structure or spring controlled telescopic structure, etc.;Among them, hollow upright strut 5 or hollow upright strut 5 can be provided with control member for cooperating with the telescopic structure, such as hydraulic oil pipeline, circuit or gas circuit, etc.

[0023] Further, the telescopic part comprises a diagonal strut 6, one end of the diagonal strut 6 is hingedly connected with the bottom of the hollow vertical strut 5, the other end of the diagonal strut 6 is movably hingedly connected with one end of the horizontal strut 7 and the end of the shoe cutter 3 respectively; the other end of the horizontal strut 7 is movably connected with the bottom of the central pull rod 8, the central pull rod 8 passes through the inside of the hollow vertical strut 5 and extends to the upper part of the hollow drill rod 1. The telescopic part in the utility model is preferably the foregoing structure, through the foregoing structure, the characteristics of energy saving and convenient control can be achieved, especially the foregoing structure can form a triangular structure composed of the diagonal strut 6, the horizontal strut 7 and the central pull rod 8 when the shoe cutter 3 is extended, so that the structure of the shoe cutter 3 can always remain stable during the working process, which lays a foundation for variable-diameter drilling and improving the quality of pile holes.

[0024] Further, the shoe cutter 3 is a plurality of, when the shoe cutter 3 is extended, it is uniformly distributed on the upper part of the bottom center drill 2, and the front end of the shoe cutter 3 extends to the outside of the center drill 2. Through the arrangement of a plurality of shoe cutters 3, the characteristics of keeping the bottom center drill 2 stable and improving the drilling efficiency of the lower hole diameter can be achieved.

[0025] Further, the shoe cutter 3 has a one-to-one corresponding relationship with the diagonal strut 6 and the horizontal strut 7.

[0026] Further, the bottom of the hollow vertical strut 5 is hingedly connected with one end of a plurality of diagonal struts 6, and the other end of a plurality of horizontal struts 7 is movably connected with the bottom of the central pull rod 8. The shoe cutter in the utility model can preferably be two, four, six or eight, which is symmetrically arranged; when symmetrically arranged, not only can a small triangular structure composed of the diagonal strut 6, the horizontal strut 7 and the central pull rod 8 be formed, but also a large triangular structure composed of two diagonal struts 6 and two horizontal struts 7 can be formed, and the above-mentioned structure is symmetrically arranged, which not only can achieve the balance of the weight of the whole equipment to realize smooth operation, but also can make the structure more firm and reliable, improve the strength of the shoe cutter 3, and support the shoe cutter 3 to carry out drilling operation.

[0027] Further, the shoe cutter fixing and guiding unit comprises a shoe sleeve 4 that can freely enter and exit when the shoe cutter 3 is telescoped, and an arc hoop 9 is arranged between adjacent shoe sleeves 4, and the bottom of the arc hoop 9 is arranged on the top of the center drill 2. Through the above arrangement, the shoe sleeve 4 can be firmly fixed, thereby achieving firm fixation of the shoe cutter 3.

[0028] Further, the inner side of the arc hoop 9 is connected with the inner wall of the hollow connecting part 10. Through the above arrangement, the arc hoop 9 can be firmly fixed.

[0029] The working principle of the utility model is that the shoe cutter 3 is in a contracted state, drilling operation is carried out by the bottom center drill bit 2 in the utility model, when the diameter of the lower part needs to be enlarged according to the pile hole operation requirement, the center pull rod 8 moves downward to make the horizontal support rod 7 be in a horizontal state, the shoe cutter 3 is pushed out of the shoe sleeve 4, at the same time, the utility model rotates at high speed to realize diameter expansion, the shoe cutter 3 is outside the shoe sleeve 4 under the action of the inclined support rod 6 and the horizontal support rod 7 during the above-mentioned diameter expansion operation, the shoe sleeve 4 and the arc-shaped hoop 9 cooperate to resist the strong torque in the rotating process of the end part of the shoe cutter 3; when the diameter expansion operation is finished, the shoe cutter 3 is retracted when the horizontal support rod 7 is in an inclined state by moving upward; the hole sediment is removed in the subsequent process, the steel reinforcement cage is lowered to a certain depth below the pile diameter change interface, the sediment thickness is controlled within the index range by secondary punching, and finally underwater concrete is poured, and the operation can be completed.

[0030] The basic principle, main features and advantages of the utility model are shown and described above. It should be understood by the person skilled in the art that the utility model is not limited by the above-mentioned embodiments, the above-mentioned embodiments and the description in the specification only illustrate the principle of the utility model, various changes and improvements of the utility model can be made without departing from the spirit and scope of the utility model, and these changes and improvements all fall within the scope of the utility model claimed.

Claims

1. A drilling device for drilling variable-diameter piles in high-fill rock strata, characterized in that: The drilling device comprises a hollow drill rod (1), the bottom of the hollow drill rod (1) is connected with a bottom center drill bit (2) through a hollow connecting part (10), The inside of the hollow connecting part is provided with a shoe cutter extension and retraction unit capable of achieving the extension and retraction of the shoe cutter (3), the outside of the hollow connecting part is provided with a shoe cutter fixing and guiding unit, the hollow connecting part is provided with a shoe cutter inlet and outlet, and the shoe cutter inlet and outlet are provided with a shoe cover (4) corresponding to the shoe cutter fixing and guiding unit.

2. The drilling device for high fill rock stratum bored variable diameter pile according to claim 1, characterized in that: The shoe cutter extension and retraction unit comprises a hollow vertical support rod (5) arranged inside the hollow drill rod (1), and the hollow vertical support rod (5) is connected with the shoe cutter (3) through an extension and retraction part.

3. The drilling device for high fill rock stratum bored variable diameter pile according to claim 2, characterized in that: The extension and retraction part comprises an inclined support rod (6), one end of the inclined support rod (6) is hingedly connected with the bottom of the hollow vertical support rod (5), the other end of the inclined support rod (6) is movably hingedly connected with one end of a horizontal support rod (7) and the tail end of the shoe cutter (3) respectively, the other end of the horizontal support rod (7) is movably connected with the bottom of a center pull rod (8), and the center pull rod (8) extends through the inside of the hollow vertical support rod (5) and reaches the upper part of the hollow drill rod (1).

4. The drilling device for high fill rock stratum bored variable diameter pile according to claim 3, characterized in that: The shoe cutter (3) is a plurality of shoe cutters, when the shoe cutters (3) are extended, they are uniformly distributed on the upper part of the bottom center drill bit (2), and the front ends of the shoe cutters (3) extend to the outside of the center drill bit (2).

5. The drilling device for high fill rock stratum bored variable diameter pile according to claim 4, characterized in that: The shoe cutter (3) has a one-to-one corresponding relationship with the inclined support rod (6) and the horizontal support rod (7).

6. The drilling device for high fill rock stratum bored variable diameter pile according to claim 5, characterized in that: The bottom of the hollow vertical support rod (5) is hingedly connected with one end of the plurality of inclined support rods (6), and the other end of the plurality of horizontal support rods (7) is movably connected with the bottom of the center pull rod (8).

7. A drilling apparatus for high fill ground drilling of a jacked pile according to any one of claims 4 to 6, wherein: The shoe cutter fixing and guiding unit comprises a shoe cover (4) capable of freely entering and exiting when the shoe cutter (3) is extended and retracted, an arc-shaped hoop (9) is arranged between adjacent shoe covers (4), and the bottom of the arc-shaped hoop (9) is arranged on the top of the center drill bit (2).

8. The drilling device for high fill rock stratum bored variable diameter pile according to claim 7, characterized in that: The inner side of the arc-shaped hoop (9) is connected with the inner wall of the hollow connecting part (10).

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