CN218669230U - Drilling tool - Google Patents

Abstract

The utility model provides a drilling tool relates to pile foundation construction technical field. The drilling tool comprises a drill rod, wherein a rod body of the drill rod is provided with a helical blade which extends spirally along the length direction of the rod body; the drilling tool also comprises an inner diameter adjusting piece and an outer diameter adjusting piece; the inner diameter adjusting piece is arranged on the periphery of the drill rod, the movable end of the inner diameter adjusting piece is used for extending out and fixing along the direction far away from the drill rod when the drilling tool rotates reversely, and retracting to the periphery of the drill rod along the direction close to the drill rod when the drilling tool rotates positively; the outer diameter adjusting piece is installed on the peripheral side of the helical blade, the movable end of the outer diameter adjusting piece is used for extending out and fixing in the direction away from the edge of the helical blade when the drilling tool rotates reversely, and retracting to the peripheral side of the helical blade in the direction close to the edge of the helical blade when the drilling tool rotates positively. The drilling tool can correspondingly adjust the inner diameter and the outer diameter of the screw pile formed after the drilling tool drills down through the inner diameter adjusting piece and the outer diameter adjusting piece, and the drilling tools with different inner diameters or outer diameters do not need to be manufactured.

Description

Drilling tool

Technical Field

The utility model belongs to the technical field of pile foundation construction technique and specifically relates to a drilling tool is related to.

Background

The screw pile is a high-bearing capacity special-shaped pile with a pile body provided with a threaded section, wherein the diameter of the screw pile at the threaded section is divided into an outer diameter shown as a section A in figure 1 and an inner diameter shown as a section B in figure 1.

When constructing a threaded section of a screw pile, a pile machine is generally used for applying rotary power and pressure to a hollow drilling tool with helical blades on the outer wall so that the drilling tool synchronously rotates and pressurizes underground to drill a pile hole, and then concrete is poured into the drilling tool for pile forming. The thread section of the pile is formed by synchronous rotation of the helical blade of the drilling tool in the lifting process of the drilling tool, and therefore the inner diameter and the outer diameter of the thread section of the pile are respectively determined by the maximum diameter of a circular tube of the drilling tool and the maximum outer diameter of the helical blade of the drilling tool.

In construction, different inner diameters and outer diameters of the screw piles need to be designed according to different purposes such as geological conditions, pulling resistance or compression resistance of the screw piles and the like, and drilling tools with different inner diameters or outer diameters need to be manufactured according to the design requirements of the piles for meeting the requirements of different inner diameters and outer diameters of the screw piles for the existing pile forming equipment and the existing pile forming process, so that the drilling tools need to be frequently replaced during pile construction, time is greatly wasted, and the cost of the drilling tools is increased.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a drilling tool to alleviate the different inside and outside diameter requirements for satisfying the screw rod stake that exist among the prior art, need make the drilling tool of different internal diameters or external diameter according to the design requirement of stake, consequently need frequently change the drilling tool when the construction stake, very waste time and increase the technical problem of drilling tool cost.

In a first aspect, the present invention provides a drilling tool, comprising a drill rod, wherein a rod body of the drill rod is provided with a helical blade extending helically along the length direction thereof; the drilling tool also comprises an inner diameter adjusting piece and an outer diameter adjusting piece;

the inner diameter adjusting piece is arranged on the periphery of the drill rod and comprises a movable end, and the movable end of the inner diameter adjusting piece is used for extending out and fixing along the direction far away from the drill rod when the drilling tool rotates reversely and retracting along the direction close to the drill rod to the periphery of the drill rod when the drilling tool rotates positively;

the external diameter regulating part install in helical blade's week side, the external diameter regulating part includes the expansion end, the expansion end of external diameter regulating part is used for along keeping away from when the drilling tool reversal the direction at helical blade edge is stretched out and is fixed, and is in when the drilling tool corotation along being close to helical blade edge's direction retracts to helical blade's week side.

In an alternative embodiment, the inner diameter adjusting member is rotatably mounted on the circumferential side of the drill rod, and the inner diameter adjusting member is configured to be converged and engaged on the circumferential side of the drill rod when the drill tool rotates forward and to be rotated and deployed on the circumferential side of the drill rod when the drill tool rotates backward.

In an optional embodiment, the drilling tool further includes an inner diameter limiting member, the inner diameter limiting member is mounted on the shaft body of the drill rod or the spiral blade and is disposed at one side of the inner diameter adjusting member at an interval, and the inner diameter limiting member is configured to abut against the inner diameter adjusting member after rotating and expanding when the drilling tool rotates reversely, so as to limit a rotation angle of the inner diameter adjusting member.

In an alternative embodiment, the shaft of the drill rod or the helical blade is provided with a plurality of mounting holes distributed at intervals along the circumferential direction of the drill rod, and the inner diameter limiting part is detachably mounted at any one of the mounting holes.

In an alternative embodiment, the outer diameter adjusting member is rotatably mounted on a peripheral side of the helical blade, and the outer diameter adjusting member is configured to be converged and engaged on the peripheral side of the helical blade when the drill is rotated in the forward direction, and to be rotated and expanded on the peripheral side of the helical blade when the drill is rotated in the reverse direction.

In an optional implementation manner, the drilling tool further includes an outer diameter limiting member, the outer diameter limiting member is mounted on the spiral blade and disposed at one side of the outer diameter adjusting member at an interval, and the outer diameter limiting member is configured to abut against the outer diameter adjusting member after rotating and expanding when the drilling tool rotates reversely, so as to limit a rotation angle of the outer diameter adjusting member.

In an alternative embodiment, the outer diameter limiting member is a protrusion provided at an edge of the helical blade.

In an alternative embodiment, the linear distance between the two ends of the helical blade is less than the length of the drill rod.

In an alternative embodiment, the inner diameter adjusting part is located between two adjacent blades of the helical blade, and the inner diameter adjusting part is rotatably connected with two adjacent blades of the helical blade through a rotating shaft.

In an alternative embodiment, the circumferential side wall of the inner diameter adjuster extends in the spiral direction of the spiral blade.

The utility model provides a drilling tool which comprises a drill rod, wherein a rod body of the drill rod is provided with a helical blade which extends spirally along the length direction of the drill rod; the drilling tool also comprises an inner diameter adjusting piece and an outer diameter adjusting piece; the inner diameter adjusting piece is arranged on the periphery of the drill rod and comprises a movable end, and the movable end of the inner diameter adjusting piece is used for extending out and fixing along the direction far away from the drill rod when the drilling tool rotates reversely and retracting to the periphery of the drill rod along the direction close to the drill rod when the drilling tool rotates positively; the outer diameter adjusting piece is installed on the peripheral side of the helical blade and comprises a movable end, and the movable end of the outer diameter adjusting piece is used for extending out and fixing along the direction far away from the edge of the helical blade when the drilling tool rotates reversely and retracting to the peripheral side of the helical blade along the direction close to the edge of the helical blade when the drilling tool rotates positively. The utility model provides a drilling tool has helical blade, and this drilling tool can be used for the construction to form the screw rod stake with current drilling tool that has helical blade equally, and the internal diameter and the external diameter of the screw rod section of screw rod stake are decided by the drilling rod maximum diameter of drilling tool and helical blade's maximum external diameter respectively equally. Utilize the utility model discloses a during drilling tool construction screw rod stake, can make drilling tool corotation earlier bore into the soil body, the expansion end of the internal diameter regulating part of drilling tool this moment contracts to the week side of drilling rod, and the expansion end of the external diameter regulating part of drilling tool contracts to helical blade's week side, and internal diameter regulating part and external diameter regulating part all can not cause the hindrance to the process that the drilling tool bored into the soil body. After the drilling tool drills down to a proper position, the drilling tool is lifted up and reversed, after the drilling tool reverses, the movable end of the inner diameter adjusting piece extends out and is fixed from the peripheral side of the drilling rod along the direction far away from the drilling rod, at the moment, the movable end of the inner diameter adjusting piece determines the maximum diameter of the drilling rod, the inner diameter of a pile hole with threads drilled by the drilling tool can be expanded while the drilling tool is lifted up, and then the inner diameter of a screw pile thread section formed in the pile hole by construction can be expanded; simultaneously, the expansion end of external diameter regulating part can stretch out and fix along the direction of keeping away from the helical blade edge by helical blade's week side, and the maximum external diameter of helical blade is decided to the expansion end of external diameter regulating part this moment, and it can enlarge the external diameter in the threaded stake hole that the drilling tool drilled out when lifting the drilling tool, and then can enlarge the external diameter of the screw rod stake screw thread section that the construction formed in the stake hole. It can be seen that, the inner diameter of the screw pile thread section is determined by the movable end of the inner diameter adjusting piece, and the outer diameter of the screw pile thread section is determined by the movable end of the outer diameter adjusting piece. It should be noted that, the extension distance of the movable end of the inner diameter adjusting piece when the drilling tool rotates reversely and the extension distance of the movable end of the outer diameter adjusting piece when the drilling tool rotates reversely can be adjusted according to construction requirements respectively, and the extension distance after adjustment can be fixed. Therefore, the utility model discloses an internal diameter regulating part among the drilling tool can be used for the internal diameter of adjusting screw pile screw thread section, and external diameter regulating part can be used for the external diameter of adjusting screw pile screw thread section, when the internal diameter and the external diameter of needs adjusting screw pile screw thread section, need not make the drilling tool of different internal diameters according to the designing requirement, also need not frequently to change the drilling tool, not only can practice thrift the engineering time, and can reduce the drilling tool cost.

It can be seen that, compare with prior art, the utility model provides a drilling tool passes through internal diameter regulating part and external diameter regulating part and can correspond the regulation respectively to the internal diameter and the external diameter of the screw rod stake that the drilling tool underdrilled back formed, need not make the drilling tool of different internal diameters or external diameter.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a partial structural view of a conventional screw pile;

fig. 2 is a schematic structural diagram of a drilling tool according to an embodiment of the present invention;

FIG. 3 isbase:Sub>A sectional view taken along line A-A of FIG. 2;

FIG. 4 is a cross-sectional view taken along line B-B of FIG. 2;

fig. 5 is another schematic structural diagram of a drilling tool according to an embodiment of the present invention;

FIG. 6 is a cross-sectional view taken at C-C of FIG. 5;

FIG. 7 is a cross-sectional view taken along line D-D of FIG. 5;

FIG. 8 is a cross-sectional view E-E of FIG. 5;

fig. 9 is a cross-sectional view of a drilling tool according to an embodiment of the present invention;

FIG. 10 is a schematic structural view of a drill rod and an inner diameter adjusting member according to an embodiment of the present invention;

FIG. 11 is a cross-sectional view of the drill rod and inner diameter adjuster of FIG. 10;

FIG. 12 is another schematic view of the drill rod and inner diameter adjuster according to an embodiment of the present invention;

FIG. 13 is a cross-sectional view of the drill rod and inner diameter adjuster of FIG. 12;

fig. 14 is a schematic structural view of a drill rod and an outer diameter adjusting member according to an embodiment of the present invention;

FIG. 15 is a cross-sectional view of the drill rod and outer diameter adjuster of FIG. 14;

FIG. 16 is another schematic view of a drill rod and an outer diameter adjustment member according to an embodiment of the present invention;

FIG. 17 is a cross-sectional view of the drill rod and outer diameter adjustment member of FIG. 16;

fig. 18 is a schematic view of another structure of a drilling tool according to an embodiment of the present invention;

FIG. 19 is a cross-sectional view of the drilling tool of FIG. 18;

fig. 20 is a schematic view of another structure of a drilling tool according to an embodiment of the present invention;

FIG. 21 is a cross-sectional view of the drilling tool of FIG. 20;

fig. 22 is a schematic structural view of a screw pile provided in an embodiment of the present invention;

fig. 23 is a schematic structural view of another screw pile provided by an embodiment of the present invention.

Icon: 1-screw pile; 2-a drill rod; 20-helical blades; 200-mounting holes; 3-inner diameter adjusting piece; 4-outer diameter adjusting piece; 5-an inner diameter limiter; 6-outer diameter limiting piece; 7-a reducing body.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Some embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.

Example (b):

as shown in fig. 2-21, the drilling tool provided by the present embodiment comprises a drill rod 2, wherein the shank of the drill rod 2 is provided with a helical blade 20 extending helically along the length direction thereof; the drill further comprises an inner diameter adjustment member 3 and an outer diameter adjustment member 4. As shown in fig. 10 to 13, the inner diameter adjusting member 3 is mounted on the circumferential side of the drill rod 2, and the inner diameter adjusting member 3 includes a movable end, as shown in fig. 10 and 11, for extending and fixing in a direction away from the drill rod 2 when the drill is reversely rotated, and for retracting to the circumferential side of the drill rod 2 in a direction close to the drill rod 2 when the drill is normally rotated. As shown in fig. 14 to 17, the outer diameter adjusting member 4 is mounted on the peripheral side of the spiral blade 20, and the outer diameter adjusting member 4 includes a movable end, as shown in fig. 14 and 15, the movable end of the outer diameter adjusting member 4 is adapted to be extended and fixed in a direction away from the edge of the spiral blade 20 when the drill is rotated in the reverse direction, and to be retracted to the peripheral side of the spiral blade 20 in a direction close to the edge of the spiral blade 20 when the drill is rotated in the forward direction, as shown in fig. 16 and 17.

The drilling tool provided by the embodiment is provided with the spiral blade 20, the drilling tool can be used for forming the screw pile 1 like the existing drilling tool with the spiral blade, and the inner diameter and the outer diameter of the thread section of the screw pile 1 are respectively determined by the maximum diameter of the drill rod 2 of the drilling tool and the maximum outer diameter of the spiral blade 20.

Wherein, the forward rotation direction and the reverse rotation direction are set according to the rotation direction of the helical blade 20 on the drill rod 2, so that when the drilling tool drills down, the inner diameter adjusting piece 3 and the outer diameter adjusting piece 4 are respectively in a retraction state and can rotate in the same direction with the helical blade 20 on the drill rod 2 to drill down; and, when the drilling tool is lifted, the inner diameter adjusting piece 3 and the outer diameter adjusting piece 4 are respectively in an unfolding state. The rotation direction of the helical blade 20 of the drill provided in this embodiment is shown in fig. 10, 12, 14, 16, 18 and 20, in which the forward rotation direction of the drill is shown by the arrow in fig. 13, 17 and 21, and the reverse rotation direction of the drill is shown by the arrow in fig. 11, 15 and 19.

When the utility model is used, the drilling tool can be made to positively rotate and drill into the soil body, as shown in fig. 2-4, 9 and 12-13, the movable end of the inner diameter adjusting part 3 of the drilling tool retracts to the peripheral side of the drilling rod 2, as shown in fig. 2, 3, 4, 9 and 16-17, the movable end of the outer diameter adjusting part 4 of the drilling tool retracts to the peripheral side of the helical blade 20, and the inner diameter adjusting part 3 and the outer diameter adjusting part 4 can not obstruct the process of the drilling tool drilling into the soil body. After the drilling tool is put in place, the drilling tool is lifted up and reversed, and after the drilling tool is reversed, as shown in fig. 5-8 and fig. 10-11, the movable end of the inner diameter adjusting part 3 extends and is fixed from the peripheral side of the drilling rod 2 along the direction far away from the drilling rod 2, at the moment, the movable end of the inner diameter adjusting part 3 determines the maximum diameter of the drilling rod 2, and the movable end can expand the inner diameter of a pile hole with threads drilled by the drilling tool while the drilling tool is lifted up, so that the inner diameter of a thread section of the screw pile 1 formed by construction in the pile hole can be expanded; meanwhile, as shown in fig. 5, 6, 7 and 14-15, the movable end of the outer diameter adjusting member 4 extends and is fixed from the peripheral side of the helical blade 20 in a direction away from the edge of the helical blade 20, and the movable end of the outer diameter adjusting member 4 determines the maximum outer diameter of the helical blade 20, which can expand the outer diameter of the threaded pile hole drilled by the drilling tool while lifting the drilling tool, and further expand the outer diameter of the threaded section of the screw pile 1 constructed in the pile hole. It can be seen that the inner diameter of the threaded section of the screw pile 1 is determined by the movable end of the inner diameter adjusting piece 3, and the outer diameter of the threaded section of the screw pile 1 is determined by the movable end of the outer diameter adjusting piece 4.

It should be noted that, the extension distances of the movable end of the inner diameter adjusting part 3 and the movable end of the outer diameter adjusting part 4 when the drilling tool rotates reversely can be respectively adjusted according to construction requirements, and the extension distances after adjustment can be fixed, the adjustment mode of the extension distances can be realized by adopting the inner diameter adjusting part 3 and the outer diameter adjusting part 4 with different lengths, and the adjustment mode can also be realized by adjusting the maximum moving distance of the movable end of the inner diameter adjusting part 3 and the maximum moving distance of the movable end of the outer diameter adjusting part 4. Therefore, the inner diameter adjusting part 3 in the drilling tool of the embodiment can be used for adjusting the inner diameter of the threaded section of the screw pile 1, the outer diameter adjusting part 4 can be used for adjusting the outer diameter of the threaded section of the screw pile 1, when the inner diameter and the outer diameter of the threaded section of the screw pile 1 need to be adjusted, drilling tools with different inner diameters do not need to be manufactured according to design requirements, the drilling tools do not need to be frequently replaced, the construction time can be saved, and the cost of the drilling tools can be reduced.

Compared with the prior art, the drilling tool provided by the embodiment can respectively and correspondingly adjust the inner diameter and the outer diameter of the screw pile 1 formed after the drilling tool drills down through the inner diameter adjusting piece 3 and the outer diameter adjusting piece 4, and the drilling tools with different inner diameters or outer diameters do not need to be manufactured.

It can be seen that the drilling tool provided by the embodiment can realize the following functions: the large-diameter screw pile 1 is constructed on the premise that a small-diameter drill rod 2 is adopted. Even though the conventional pile foundation hole-enlarging method is various (as disclosed in patent publication No. CN102191772A, CN1814915A, CN202227989U, CN204266923U, CN204571847U, CN104389516B, CN206707633U, CN206845099U, CN203488103U, etc.), the conventional pile foundation hole-enlarging method still cannot simultaneously achieve the above-mentioned functions that can be achieved by the drilling tool of the present embodiment.

Specifically, the precast reaming pile disclosed in CN102191772a is a precast pile rather than a cast-in-place pile in this application, and the precast pile is reamed by pulling a reaming mechanism installed at the bottom of the precast pile through a guy cable, which cannot not only construct a screw pile with a threaded section, but also cannot adjust the inner diameter or the outer diameter of the threaded section of the screw pile.

CN1814915A discloses a pile forming device, it is through the hydraulic cylinder traction pull rod at long auger stem top, by articulated pole promotion expand the sword between expanding sword and the pull rod and accomplish telescopic motion to realize reaming, it can realize the adjustment of stake hole external diameter through expanding the sword, but its internal diameter that can not realize the stake hole screw thread section adjusts, and the device structure is complicated, need to match hydraulic means and use, and the cost is also comparatively high.

The combined drilling tool disclosed in CN202227989U adjusts the outer diameter by operating the oil cylinder inside to extend and retract to control the cutter expanding rod to open, but it can only adjust the outer diameter of the pile hole but cannot adjust the inner diameter, and the device is also complex in structure, needs to be used with the oil cylinder, and is also expensive in cost.

The long auger drilling bottom expanding device disclosed in CN204266923U drives the connecting rod to move by extending or shortening the oil cylinder at the top of the auger stem, so that the hole expanding device is folded or extended, and then the extended hole expanding device is used for expanding holes. However, the outer diameter of the pile hole can be adjusted only, but the inner diameter cannot be adjusted, and the pile hole is also matched with an oil cylinder, so that the construction cost is high.

The drilling tool disclosed in CN204571847U has its reaming bit capable of being in a converging state by a forward rotation drilling tool during drilling down and in an expanding state by a reverse rotation drilling tool during drilling up, so as to adjust the outer diameter of the pile foundation.

The hole forming method disclosed in CN104389516B can be used for constructing and forming a compacted columnar or compacted threaded cast-in-place pile, but cannot realize pile foundation inner diameter adjustment and outer diameter adjustment, and cannot be used for constructing and forming a large-diameter screw pile on the premise of adopting a small-diameter drill rod.

The hole expanding drill tool disclosed in CN206707633U and the hole expanding drill machine disclosed in CN206845099U can make the expanding cutter body on the drill tool in the convergence expansion state during the drilling process by the forward rotation drill tool and make the expanding cutter body on the drill tool in the expansion state during the drilling process by the reverse rotation drill tool, so as to realize the external diameter adjustment of the pile foundation.

The rotary drilling tool disclosed in CN203488103U can also make the reaming assembly on the drilling tool in convergence expansion during drilling down through a forward rotation drilling tool, and make the reaming assembly in expansion condition during drilling up through a reverse rotation drilling tool, so as to achieve the adjustment of the outer diameter of the pile foundation, but the rotary drilling tool cannot be used to construct a screw pile with a threaded section, cannot be used to achieve the adjustment of the inner diameter of the threaded section of the screw pile, and cannot be used to construct a large-diameter screw pile on the premise of adopting a small-diameter drilling rod.

It should be further noted that, for the screw pile 1 with a larger diameter, in order to meet the requirement of the designed diameter, the diameter of the circular tube of the existing drilling tool for constructing the screw pile is also larger, which often results in large drilling resistance and extremely difficult construction, and also greatly increases the output energy consumption of the screw pile machine driving the drilling tool to work, for example, the screw pile with the outer diameter of 600mm has the designed inner diameter generally not less than 560mm, while the circular tube of the large-diameter drilling tool increases the drilling resistance, and according to the field construction experience, the output torque of the drilling tool generally not less than 35T · M, thereby greatly increasing the output energy consumption of the screw pile machine.

The drilling tool in the embodiment can ensure the inner diameter of the screw pile 1 through the inner diameter adjusting part 3 and ensure the outer diameter of the screw pile 1 through the outer diameter adjusting part 4, so that the diameter of the drill rod 2 of the drilling tool is not required to be increased, larger resistance cannot be caused in the drilling process, and the energy consumption of the screw pile machine cannot be increased.

In addition, current drilling tool is in order to reduce the resistance when carrying the brill, prevents that the soil body from pushing down and buries the drilling tool in the soil body, need set up helical blade in the whole pipe shaft scope of drilling tool pipe usually, also promptly, length between the helical blade's of current drilling tool both ends equals the length of pipe, but the helical blade overlength of current drilling tool can increase the area of contact between drilling tool and the soil body to increased drilling tool construction difficulty degree and increased the power consumption consumptive material.

And the drilling tool that this embodiment provided can utilize internal diameter regulating part 3 and external diameter regulating part 4 to carry out the reaming promotion at the in-process of carrying out the brill to increased the side direction extrusion force of drilling tool to the soil body, reduced the resistance of carrying out the brill process, therefore the drilling tool that this embodiment provided need not set up helical blade 20 at 2 whole shaft ranges of drilling rod, the length between the both ends of helical blade 20 can be less than the length of drilling rod 2 this moment, can effectively reduce the area of contact between drilling tool and the soil body, and then reduce drilling tool construction difficulty degree and power consumption consumptive material. Therefore, the present embodiment preferably has the linear distance between both ends of the helical blade 20 smaller than the length of the drill rod 2.

As shown in fig. 10 to 13, the inner diameter adjuster 3 is rotatably attached to the circumferential side of the drill rod 2, and the inner diameter adjuster 3 is configured to be fitted to the circumferential side of the drill rod 2 in a converging manner when the drill is rotated in the forward direction and to be rotated and spread on the circumferential side of the drill rod 2 when the drill is rotated in the reverse direction.

In practical application, in order to realize retraction and expansion of the movable end of the inner diameter adjusting part 3, the inner diameter adjusting part 3 may be a telescopic rod, but in order to enable the inner diameter adjusting part 3 to be automatically retracted or expanded under the driving of a rotating drilling tool, in the embodiment, it is preferable that the inner diameter adjusting part 3 is rotatably installed on the peripheral side of the drilling rod 2, at this time, the inner diameter adjusting part 3 can be automatically converged and attached to the peripheral side of the drilling rod 2 along with the rotation of the drilling tool when the drilling tool rotates forwards, and can be automatically rotated and expanded on the peripheral side of the drilling rod 2 along with the rotation of the drilling tool when the drilling tool rotates backwards.

It can be seen that, compared with the inner diameter adjusting member 3 which is a telescopic rod, the inner diameter adjusting member 3 which is rotatably installed on the peripheral side of the drill rod 2 in the embodiment does not need to manually adjust the position state of the movable end of the inner diameter adjusting member 3, and the use convenience of the drilling tool can be effectively improved.

As shown in fig. 2, 5 and 7, the drilling tool provided in this embodiment further includes an inner diameter limiting member 5, the inner diameter limiting member 5 is mounted on the shaft or the helical blade 20 of the drill rod 2 and is disposed at one side of the inner diameter adjusting member 3 at an interval, and the inner diameter limiting member 5 is configured to abut against the inner diameter adjusting member 3 after rotating and expanding when the drilling tool rotates reversely, so as to limit the rotation angle of the inner diameter adjusting member 3.

The inner diameter limiting part 5 in this embodiment may limit the expansion position of the inner diameter adjusting part 3 after the inner diameter adjusting part 3 expands along with the rotation of the drilling tool, thereby preventing the inner diameter adjusting part 3 from rotating too much and converging again to the peripheral side of the drilling rod 2, and when the drilling tool rotates reversely and lifts up, because the expansion position of the inner diameter adjusting part 3 is limited, in combination with the reaction force applied by the soil body to the inner diameter adjusting part 3 when the drilling tool rotates reversely, the expansion position of the inner diameter adjusting part 3 may be kept fixed, and further, the soil body on the peripheral side thereof may be extruded to realize reaming.

The inner diameter limiting member 5 may be fixed to the shaft or the helical blade 20 of the drill rod 2 by clamping, screwing, welding, or the like.

The inner diameter limiting part 5 may be a block or rod-shaped structure, and in this embodiment, it is preferable that the inner diameter limiting part 5 is a rod, specifically, the inner diameter limiting part 5 may be a limiting pin, and the limiting pin is fixed on the rod body or the helical blade 20 of the drill rod 2 in an inserting manner.

As shown in fig. 3 and 4, the shaft or the helical blade 20 of the drill rod 2 is provided with a plurality of mounting holes 200 spaced along the circumferential direction thereof, and the inner diameter limiting member 5 is detachably mounted at any one of the mounting holes 200.

In this embodiment, after the inner diameter adjusting part 3 rotatably installed on the peripheral side of the drill rod 2 is rotatably expanded on the peripheral side of the drill rod 2, the expansion angle of the inner diameter adjusting part can determine the distance between the movable end of the inner diameter adjusting part 3 and the central axis of the drill rod 2, so that the reaming range of the movable end of the inner diameter adjusting part 3 can be determined, and the inner diameter of the screw pile 1 can be adjusted.

The plurality of mounting holes 200 distributed at intervals along the circumferential direction of the drill rod 2 or the plurality of mounting holes 200 distributed at intervals along the circumferential direction of the helical blade 20 are distributed at intervals along the range of the rotation track of the inner diameter adjusting piece 3, and when the inner diameter adjusting piece 3 is rotationally expanded to meet the design requirement of the inner diameter of the screw pile 1, the inner diameter limiting piece 5 can be installed in the corresponding mounting hole 200, so that the expanded inner diameter adjusting piece 3 is limited and fixed.

It can be seen that a plurality of mounting holes 200 can be mutually matched with the inner diameter limiting part 5 to limit the expansion angle of the inner diameter adjusting part 3, so that the design requirements of different inner diameters of the screw pile 1 can be met, and the applicability of the drilling tool is improved.

In order to improve the installation stability of the bore stopper 5 and the limit stability of the bore stopper 5 to the bore adjusting member 3, as shown in fig. 3 and 4, the installation hole 200 is preferably provided on the helical blade 20 on the drill rod 2.

In the present embodiment, the inner diameter adjuster 3 may be located between two adjacent ones of the helical blades 20 with a circumferential side wall of the inner diameter adjuster 3 extending in the helical direction of the helical blades 20.

When the circumferential side wall of the inner diameter adjusting part 3 extends along the spiral direction of the spiral blade 20, the stress direction of the inner diameter adjusting part 3 in the soil body is consistent with the stress direction of the spiral blade 20, the resistance of the inner diameter adjusting part 3 can be reduced at the moment, the energy consumption of a drilling tool in the using process can be reduced, and the pile hole can be formed more regularly.

Further, as shown in fig. 5 and 8, the inner diameter adjusting part 3 may be a block, and the end portion thereof far away from the movable end may be provided with a rotating shaft penetrating through both sides thereof, and both ends of the rotating shaft are exposed outside the side wall of the inner diameter adjusting part 3. The block-shaped inner diameter adjusting member 3 may be installed between two adjacent blades of the helical blade 20, pin holes are respectively formed at positions of the two adjacent blades corresponding to two ends of a rotating shaft on the inner diameter adjusting member 3, and two ends of the rotating shaft are respectively rotatably installed in the pin holes of the two adjacent blades.

Further, as shown in fig. 14 to 17, the outer diameter adjusting member 4 is rotatably attached to the peripheral side of the helical blade 20, and the outer diameter adjusting member 4 is adapted to be brought into contact with the peripheral side of the helical blade 20 in the normal rotation of the drill and to be rotated and spread on the peripheral side of the helical blade 20 in the reverse rotation of the drill.

In order to realize the retraction and the expansion of the movable end of the outer diameter adjusting member 4, the outer diameter adjusting member 4 may also be a telescopic rod, and similarly, in order to enable the outer diameter adjusting member 4 to be automatically retracted or expanded under the driving of a rotating drilling tool, in this embodiment, it is preferable that the outer diameter adjusting member 4 is rotatably mounted on the peripheral side of the helical blade 20, and at this time, the outer diameter adjusting member 4 can automatically converge and attach to the peripheral side of the helical blade 20 along with the rotation of the drilling tool when the drilling tool rotates forwards and can automatically rotate and expand on the peripheral side of the helical blade 20 along with the rotation of the drilling tool when the drilling tool rotates backwards.

Compared with a telescopic rod, the outer diameter adjusting piece 4 which is rotatably arranged on the peripheral side of the helical blade 20 in the embodiment does not need to manually adjust the position state of the movable end of the outer diameter adjusting piece 4, and the use convenience of the drilling tool can be further effectively improved.

Further, the outer diameter adjusting member 4 may also be block-shaped, and the end portion thereof far away from the movable end may also be provided with a rotating shaft penetrating through two sides thereof, and two ends of the rotating shaft are exposed outside the side wall of the outer diameter adjusting member 4. At this time, lug plates may be fixed to both sides of the spiral blade 20, and the lug plates are provided with through holes, and both ends of the rotating shaft of the outer diameter adjusting member 4 are rotatably installed in the through holes of the two lug plates, respectively.

As shown in fig. 2, 5, 6 and 7, the drilling tool provided in this embodiment further includes an outer diameter limiting member 6, the outer diameter limiting member 6 is mounted on the helical blade 20 and is disposed at one side of the outer diameter adjusting member 4 at an interval, and the outer diameter limiting member 6 is configured to abut against the outer diameter adjusting member 4 after being rotated and unfolded when the drilling tool is rotated reversely, so as to limit the rotation angle of the outer diameter adjusting member 4.

Wherein, on the rotation orbit of external diameter regulating part 4 was located to external diameter locating part 6, when external diameter regulating part 4 rotated and expanded to satisfying 1 external diameter designing requirement of screw rod stake, external diameter locating part 6 can carry out spacing and fixed with external diameter regulating part 4 butt with external diameter regulating part to the external diameter regulating part 4 after the rotation expansion.

It can be seen that, in the present embodiment, the outer diameter limiting member 6 may limit the expanded position of the outer diameter adjusting member 4 after the outer diameter adjusting member 4 expands along with the rotation of the drilling tool, so as to prevent the outer diameter adjusting member 4 from rotating too much and converging to the peripheral side of the helical blade 20, and when the drilling tool rotates reversely and lifts up, because the expanded position of the outer diameter adjusting member 4 is limited, in combination with the reaction force applied by the soil body to the outer diameter adjusting member 4 when the drilling tool rotates reversely, the expanded position of the outer diameter adjusting member 4 may be kept fixed, and further, the soil body on the peripheral side thereof may be squeezed to realize hole expansion.

In practical applications, the outer diameter limiting member 6 may be a block or a sheet structure fixed on the outer edge of the helical blade 20, and further, the outer diameter limiting member 6 may be fixed on the helical blade 20 by clamping, screwing, welding, or the like.

In order to simplify the structure of the drilling tool and improve the stability of the outer diameter limiting member 6, as shown in fig. 6 and 7, the outer diameter limiting member 6 is preferably a protrusion provided at the edge of the helical blade 20 in the present embodiment.

Furthermore, in order to improve the cutting and squeezing reaming effects of the helical blades 20 on the soil body in the drilling tool of the present embodiment, the edges of the helical blades 20 are preferably toothed.

When the edge of the helical blade 20 is toothed, the edge of the helical blade 20 includes a plurality of concave portions and a plurality of convex portions which are distributed in a crossed and continuous manner, and the concave portions can provide an installation space for the outer diameter adjusting piece 4, so that not only can the space on the peripheral side of the helical blade 20 be effectively utilized, but also the outer diameter adjusting piece 4 can be more easily converged and attached to the peripheral side of the helical blade 20; the protruding portion may form an outer diameter limiting member 6, so as to limit the rotation angle of the outer diameter adjusting member 4 at the recessed portion.

When external diameter locating part 6 is for locating the bellying of helical blade 20 edge, the rotation angle of external diameter regulating part 4 can not be adjusted, and external diameter regulating part 4 at this moment only can satisfy the specific external diameter designing requirement of screw pile 1, and in order to construct the screw pile 1 of different external diameters this moment, need adopt the expansion position of the external diameter regulating part 4 of different sizes with the expansion end of adjustment external diameter regulating part 4 to change the reaming scope of the expansion end of external diameter regulating part 4.

In order to adjust the rotation angle of the outer diameter adjusting member 4, so that the drilling tool can be applied to the screw piles 1 with different outer diameter design requirements, the outer diameter adjusting member in this embodiment may further include a first clamping member and a second clamping member, both the first clamping member and the second clamping member include a closed end and a clamping end with an opening, the closed end of the first clamping member is hinged to the closed end of the second clamping member, the hinged portion forms a movable end of the outer diameter adjusting member, and the clamping end of the first clamping member and the clamping end of the second clamping member are respectively clamped on two sides of the helical blade 20 and are arranged at intervals.

At this moment, the position of the movable end of the outer diameter adjusting piece can be adjusted by adjusting the distance between the clamping end of the first clamping piece and the clamping end of the second clamping piece, so that the reaming range of the movable end of the outer diameter adjusting piece is changed, and the outer diameter adjustment of the screw pile 1 is realized.

Further, the clamping end of the first clamping member may be provided with a pin, the pin is rotatably mounted on the helical blade 20, and at this time, the first clamping member can only rotate on the helical blade 20 by using the pin as a rotation central axis. Meanwhile, the clamping end of the second clamping member may be provided with a slide bar, and the helical blade 20 is provided with a slide hole extending in a helical direction thereof, the slide bar being slidably connected in the slide hole. When the position of the movable end of the outer diameter adjusting piece needs to be adjusted to adjust the reaming range, the sliding rod can be driven to move in the sliding hole, and after the sliding rod moves in place, the position of the sliding rod needs to be fixed to enable the movable end of the outer diameter adjusting piece to keep fixed.

At this time, in order to fix the position of the movable end of the outer diameter adjusting member, the outer diameter limiting member needs to adopt a fastener which can limit the movement of the clamping end of the first clamping member or the clamping end of the second clamping member, and the protruding portion cannot be adopted continuously. Specifically, the fastener can adopt the nut, and the slide bar then is equipped with the external screw thread that matches with this nut, and the nut can threaded connection on the slide bar to mutually support and press from both sides the slide bar tightly in the slide opening with the exposed core of second holder, realize the rigidity to the slide bar.

It should be noted that, when the inner diameter adjusting member 3 is rotated and expanded to the maximum angle, the distance between the movable end thereof and the central axis of the drill rod 2 is also maximized, and correspondingly, when the outer diameter adjusting member 4 is rotated and expanded to the maximum angle, the distance between the movable end thereof and the central axis of the drill rod 2 is also maximized. In order to prevent the working ranges of the inner diameter adjusting part 3 and the outer diameter adjusting part 4 from interfering with each other, the maximum distance and the minimum distance between the movable end of the inner diameter adjusting part 3 and the central axis of the drill rod 2 are preferably smaller than the maximum distance between the movable end of the outer diameter adjusting part 4 and the central axis of the drill rod 2.

It should be further noted that, in order to facilitate replacement and installation and removal of the inner diameter adjusting part 3 and the outer diameter adjusting part 4, it is preferable that the inner diameter adjusting part 3 and the outer diameter adjusting part 4 are detachably connected to the helical blade 20, and at this time, the inner diameter adjusting part 3 and the outer diameter adjusting part 4 can be installed according to construction requirements. Specifically, when the screw pile 1 is designed as a small-inner-diameter screw pile 1 or a deep-flight screw pile 1 having a pulling-out resistance requirement, the inner-diameter adjusting member 3 may not be installed on the circumferential side of the drill rod 2, and only the outer-diameter adjusting member 4 may be installed on the helical blade 20. When the screw pile 1 is designed as a shallow screw pile 1, the inner diameter adjusting member 3 is installed on the peripheral side of the drill rod 2 without installing the outer diameter adjusting member 4 on the helical blade 20. When the inner diameter and the outer diameter of the screw pile 1 need to be adjusted, the inner diameter adjusting piece 3 needs to be installed on the peripheral side of the drill rod 2, and the outer diameter adjusting piece 4 also needs to be installed on the helical blade 20.

In addition, the drilling tool provided by the embodiment can rotate in the reverse direction or in the forward direction while being lifted, and the forward rotation or the reverse rotation during lifting can be selected according to the pile forming requirement of the screw pile 1. Specifically, when the upper portion of the soil body in the construction environment of the screw pile 1 is mucky soil or collapsible soil layer and the lower portion is a soil layer with good stability, the screw pile 1 needs to be designed into a pile shape shown in fig. 22, in which the upper portion is a middle-small diameter pile body and the lower portion is a large diameter pile body. In order to form the pile type shown in fig. 22, when the drilling tool of the present embodiment is used for construction, the drilling tool may be lifted and rotated reversely in a soil layer having good stability so that both the inner diameter adjusting member 3 and the outer diameter adjusting member 4 are expanded to form a large diameter pile body, while in a muddy soil or collapsible soil layer, the drilling tool may be lifted and rotated forwardly so that both the inner diameter adjusting member 3 and the outer diameter adjusting member 4 are converged to form a middle or small diameter pile body.

Further, when the screw pile 1 is of a pile type with the enlarged diameter body 7 as shown in fig. 23, it can be realized by repeatedly lifting and lowering the drilling tool at the designed depth of the enlarged diameter body 7 while pumping concrete during the construction of the drilling tool. Specifically, the drilling tool is of a hollow structure, concrete can be poured into a pile hole drilled by the drilling tool by using the interior of the drilling tool when the drilling tool is lifted, the drilling tool is repeatedly lifted and lowered, the concrete can be extruded by the drilling tool, and then soil around the concrete can be extruded, so that the expanding body 7 shown in fig. 23 can be formed.

In summary, the drilling tool provided by the present embodiment can at least meet the following three construction requirements of the screw pile 1:

firstly, the method comprises the following steps: adjusting the inner diameter adjusting part 3, wherein the outer diameter adjusting part 4 is not installed, the drilling tool is positively rotated when drilling is carried out, and the drilling tool is reversely rotated when the drilling tool is lifted, so that the inner diameter of the screw pile 1 is increased to the design requirement;

II, secondly: adjusting an outer diameter adjusting part 4, wherein the inner diameter adjusting part 3 is not installed, the drilling tool is positively rotated when the drilling tool is drilled downwards, and the drilling tool is reversely rotated when the drilling tool is lifted, so that the outer diameter of the screw pile 1 is increased to the design requirement;

thirdly, the method comprises the following steps: the inner diameter adjusting part 3 and the outer diameter adjusting part 4 are adjusted, the drilling tool is positively rotated when the drilling tool is drilled downwards, and the drilling tool is reversely rotated when the drilling tool is lifted, so that the inner diameter and the outer diameter of the screw pile 1 are respectively increased to meet the design requirements.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims (10)

1. A drilling tool, characterized by comprising a drill rod (2), the shank of the drill rod (2) being provided with helical blades (20) extending helically along its length; the drilling tool also comprises an inner diameter adjusting piece (3) and an outer diameter adjusting piece (4);

the inner diameter adjusting piece (3) is arranged on the peripheral side of the drill rod (2), the inner diameter adjusting piece (3) comprises a movable end, and the movable end of the inner diameter adjusting piece (3) is used for extending out and fixing along the direction far away from the drill rod (2) when the drilling tool rotates reversely and retracting along the direction close to the drill rod (2) to the peripheral side of the drill rod (2) when the drilling tool rotates forwards;

the drilling tool is characterized in that the outer diameter adjusting piece (4) is installed on the peripheral side of the spiral blade (20), the outer diameter adjusting piece (4) comprises a movable end, the movable end of the outer diameter adjusting piece (4) is used for extending out and fixing the drilling tool in the direction away from the edge of the spiral blade (20) when the drilling tool rotates reversely, and retracting the drilling tool in the direction close to the edge of the spiral blade (20) to the peripheral side of the spiral blade (20) when the drilling tool rotates positively.

2. The drilling tool according to claim 1, characterized in that the inner diameter adjustment member (3) is rotatably mounted on the circumference of the drill rod (2), the inner diameter adjustment member (3) being adapted to converge against the circumference of the drill rod (2) when the drilling tool is rotated forward and to rotate and spread on the circumference of the drill rod (2) when the drilling tool is rotated backward.

3. The drilling tool according to claim 2, characterized in that the drilling tool further comprises an inner diameter limiting member (5), the inner diameter limiting member (5) is mounted on the shank or the helical blade (20) of the drill rod (2) and is arranged at one side of the inner diameter adjusting member (3) at intervals, and the inner diameter limiting member (5) is used for abutting against the rotated and unfolded inner diameter adjusting member (3) when the drilling tool is reversely rotated so as to limit the rotation angle of the inner diameter adjusting member (3).

4. The drilling tool according to claim 3, characterized in that the shank of the drill rod (2) or the helical blade (20) is provided with a plurality of mounting holes (200) distributed at intervals along the circumference thereof, and the inner diameter limiting member (5) is detachably mounted at any one of the mounting holes (200).

5. The drilling tool according to any one of claims 1 to 4, wherein the outer diameter adjusting member (4) is rotatably mounted on a peripheral side of the helical blade (20), and the outer diameter adjusting member (4) is adapted to be converged against the peripheral side of the helical blade (20) when the drilling tool is rotated in the forward direction, and to be rotated and spread on the peripheral side of the helical blade (20) when the drilling tool is rotated in the reverse direction.

6. The drilling tool according to claim 5, further comprising an outer diameter limiting member (6), wherein the outer diameter limiting member (6) is mounted on the helical blade (20) and is arranged at one side of the outer diameter adjusting member (4) at intervals, and the outer diameter limiting member (6) is used for abutting against the outer diameter adjusting member (4) after rotating and unfolding when the drilling tool rotates reversely so as to limit the rotating angle of the outer diameter adjusting member (4).

7. The drilling tool according to claim 6, characterized in that the outer diameter stop (6) is a protrusion provided at the edge of the helical blade (20).

8. Drilling tool according to any of claims 1-4, characterized in that the linear distance between the ends of the helical blade (20) is smaller than the length of the drill rod (2).

9. The drilling tool according to any one of claims 2 to 4, characterized in that the inner diameter adjusting piece (3) is positioned between two adjacent blades of the helical blade (20), and the inner diameter adjusting piece (3) is rotatably connected with two adjacent blades of the helical blade (20) through a rotating shaft.

10. The drilling tool according to claim 9, characterized in that the circumferential side wall of the inner diameter adjustment member (3) extends in the helical direction of the helical blade (20).

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