CN210858571U

CN210858571U - Thread matching type multi-power guide composite drilling tool and profile pile

Info

Publication number: CN210858571U
Application number: CN201920982546.XU
Authority: CN
Inventors: 李广信
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-06-27
Filing date: 2019-06-27
Publication date: 2020-06-26
Anticipated expiration: 2029-06-27

Abstract

The utility model belongs to the technical field of civil engineering technique and specifically relates to a compound drilling tool of many powers of screw-thread fit type guide and type stake is related to. The drilling tool comprises a guide linkage drilling tool, a middle power drilling tool and an upper power drilling tool; the upper power drill and the middle power drill are respectively provided with a power mechanism; an external thread structure is arranged on the outer side of the core pipe of the upper power drilling tool and used as a helical blade of the upper power drilling tool; the middle power drilling tool is composed of a drilling tool main body with a combined soil squeezing and discharging function, an internal thread structure is arranged on the inner side of a central core pipe of the drilling tool main body of the middle power drilling tool, and the internal thread structure is matched with the external thread structure to form threaded connection; the middle power drilling tool can reciprocate up and down/rotate and extrude once in the pile hole soil extrusion area under the driving of the power mechanism, so that the rotary dumping soil of the upper power drilling tool is extruded and expanded for multiple times/once and is absorbed until the upper and lower compactness of the wall of the whole pile hole reaches relative balance. The guide linkage drilling tool can be composed of a drilling tool main body with a combined extruding and dumping function or a dumping function.

Description

Thread matching type multi-power guide composite drilling tool and profile pile

Technical Field

The utility model belongs to the technical field of civil engineering technique and specifically relates to a compound drilling tool of many powers of screw-thread fit type guide and type stake is related to.

Background

In the soft foundation treatment of building structures or engineering such as bridges, ports, railways, highways, airports, water conservancy and hydropower facilities and the like, the foundation soil of the site soil to be treated can be generally divided into soft and weak site soil, medium and soft site soil, medium and hard site soil from shallow to deep according to the change rule of the equivalent shear wave velocity value; the foundation soil changes from shallow to deep, and the compactness changes gradually from loose to dense, thus proving the theory of rock-soil deposition. According to the soft and hard degree of the field soil and the distribution condition of each soil layer, the foundation soil can be simply divided into soil squeezing areas (soft field soil, medium soft field soil, wherein the water content is higher or saturated cohesive soil is excluded); and (4) a soil discharge area (except medium and hard field soil).

In order to improve the bearing capacity of foundation soil and reduce the settlement of foundation soil, a long spiral pressure-grouting pile-CFG pile construction method is generally adopted, in which a pile body is mainly used to replace the foundation soil. In recent years, new soil-squeezing methods such as screw piles (screw piles and shallow screw piles) and bidirectional screw soil-squeezing piles (SDS piles) have been developed. The soil-squeezing method is to improve equipment, increase dead weight and increase kinetic energy of a power mechanism so as to increase the torque of a special drilling tool. When the drilling tool is used for forming the hole, soil squeezing is mainly used, after the drilling tool drills and squeezes the soil to the designed depth, the drilling tool is lifted, and the concrete is pressed and poured to form the pile to the designed elevation, so the soil output is little, and the soil compactness around the pile is improved.

The two construction methods increase the bearing capacity of the foundation soil and reduce the settlement of the foundation soil in various stratums to different degrees. However, for complex and diversified foundation soil, drilling tools used by the two methods have single functions, the compactness is loose in shallow soft and medium soft field soil and is an extrudable soil area, the CFG pile method can only simply arrange and replace soil, and the friction resistance of the surrounding soil of the pile cannot be enhanced by the method, so that certain waste is caused; in deep medium-hard field soil, the soil quality is denser to be a soil discharge area, and the screw pile or SDS pile construction method further increases torque to squeeze and expand, so that drilling difficulty is caused, and work efficiency is influenced. If the compaction sandy soil is attempted to be squeezed and expanded, the compaction structure is broken, the strength is reduced, and even shear expansion damage is caused, so that the side friction resistance and the end resistance are reduced. The two geotechnical engineering methods have single function, cannot process foundation soil according to local conditions, cause certain cost waste and influence the bearing capacity exertion effect of a single pile. In order to solve the problems, according to the concept of the geotechnical engineering method, loose soil is suitable for extrusion during foundation treatment, dense soil is suitable for discharge, and the utility model is urgently needed. However, the extrusion-dumping composite drilling tool has the defects that: the soil squeezing gradient is suddenly changed (the blade segments of the soil squeezing and discharging spiral are relatively short), soil squeezing can be carried out while soil rotating and discharging in a close range, the contraposition of the pine needles is relatively poor due to density avoidance, and the effect of relatively balancing the compactness of the wall of the whole pile hole is poor; the soil squeezing ratio gradient is gradually changed (the blade segments of the screw for squeezing and discharging soil are relatively longer), the transfer distance of the rotary discharging soil is relatively far, and the soil squeezing effect is affected. In order to avoid the poor effect of the combined soil squeezing and discharging drilling tool, a brand-new generalized combined soil squeezing and discharging drilling tool is researched and developed.

The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information constitutes prior art already known to a person skilled in the art.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a many powers of screw-thread fit formula are led a composite drilling tool and type stake to solve the technical problem who exists among the prior art.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

in a first aspect, the utility model provides a compound drilling tool of many powers of screw-thread fit formula guide, a serial communication port, include: the guide linkage drilling tool, the middle power drilling tool and the upper power drilling tool are coaxially sleeved in sequence;

the upper power drilling tool is provided with an upper power mechanism, the upper power mechanism can independently drive the upper power drilling tool to rotate, and an external thread structure is arranged on the outer side of a central core pipe of the upper power drilling tool and is used as a helical blade of the upper power drilling tool;

the middle power drilling tool is provided with a middle power mechanism, the middle power mechanism can independently drive the middle power drilling tool to rotate, the middle power drilling tool is composed of a drilling tool main body with a soil squeezing and discharging composite function, an internal thread structure is arranged on the inner side of a middle core pipe of the drilling tool main body of the middle power drilling tool, and the internal thread structure is matched with the external thread structure to form threaded connection; the middle power drilling tool can reciprocate up and down/rotate and extrude once in the pile hole soil extrusion area under the driving of the power mechanism, so that the rotary dumping soil of the upper power drilling tool is extruded and expanded for multiple times/once to be absorbed; the outer diameter of the central core pipe of the drilling tool main body with the soil extrusion and displacement composite function is gradually increased from bottom to top and is changed according to a preset soil extrusion ratio; the squeeze ratio is defined as the ratio of the outside diameter of the center core tube to the diameter of the drill body; the width of the helical blades of the drilling tool main body is gradually reduced from bottom to top so that the outer profiles of all the helical blades are distributed in an equal diameter;

the guide linkage drilling tool is provided with a guide device, and the guide device can enable the guide linkage drilling tool and the middle power drilling tool to realize guide linkage.

As a further technical scheme, the middle power drilling tool is provided with drill teeth below a middle core tube of a drilling tool main body, and the inner side of each drill tooth is provided with an internal thread structure matched with the external thread structure.

As a further technical scheme, the number of the drill teeth is one or more, and a plurality of the drill teeth are distributed at equal intervals.

As a further technical solution, the pilot linkage drilling tool comprises: the outer sleeve drilling tool and the first guide linkage device are guide linkage rods; the outer sleeve drilling tool is sleeved on the middle power drilling tool; the peripheral surface of the first guide linkage device-guide linkage rod is provided with a guide post; the outer sleeve drilling tool adopts a soil squeezing and discharging composite drilling tool main body which mainly squeezes soil/adopts a drilling tool main body with a soil discharging function; the outer sleeve drilling tool is provided with a casing, and the outer sleeve drilling tool is horizontally fixed with the drilling tower through slips on the casing to keep the perpendicularity of the outer sleeve drilling tool

As a further technical solution, the medium power drill includes: the middle power head, the middle sleeve drilling tool and the middle lifting device; the middle power head is arranged at the upper end of the middle sleeve drilling tool and is used for driving the middle sleeve drilling tool to rotate; the middle sleeve drilling tool is sleeved on the upper power drilling tool; the middle lifting device is arranged at the lower end of the middle power head and used for driving the guide linkage drilling tool to perform lifting action; the guide linkage device comprises a second linkage device-guide linkage groove arranged on the middle sleeve drilling tool, and a guide groove and a guide ridge surface are arranged at the upper part of the second linkage device-guide linkage groove; when the guide ridge surface is contacted with the guide posts on the guide linkage rod, the guide posts can rotate along the guide ridge surface to enter the inlets of the guide grooves and move up to the horn mouths of the guide grooves passively, so that the guide linkage rod is enabled to accurately enter the guide linkage grooves, and the linkage device is locked in a sleeving manner. The middle sleeve drilling tool adopts a main body of a soil extrusion and dumping composite drilling tool which mainly extrudes soil, and an internal thread structure is arranged on the inner side of a core pipe of the middle sleeve drilling tool.

As a further aspect, the upper power drill includes: the device comprises an upper power head, a central drilling tool and an upper lifting device; the upper power head is arranged at the upper end of the central drilling tool and is used for driving the central drilling tool to rotate; the upper lifting device is arranged at the lower end of the upper power head and used for driving the middle power drilling tool to lift; and an external thread structure is arranged on the outer side of the central core pipe of the central drilling tool and is used as a helical blade of the upper power drilling tool.

As a further technical solution, the upper power drill further includes: an upper limiting device; the upper limiting device is arranged at the lower end of the upper power head.

In a second aspect, the utility model provides a basis the type stake of compound drilling tool preparation is led to many powers of screw-thread fit formula, a serial communication port, include: a main body pile body;

at least two inverted step-shaped bodies are arranged on the main body pile body;

the lower pile body of the main pile body is provided with a thread structure;

the inverted circular truncated cone generating line extension line of the inverted circular stepped profile and the included angle range of the central axis of the main pile body are as follows: 5 to 90 degrees.

In a third aspect, the present invention further provides a method for preparing a shaped pile according to the thread-fitting type multi-power guiding composite drilling tool, which comprises:

according to the requirement of the stratum on a construction method, the upper power drilling tool, the middle power drilling tool and the guide linkage power drilling tool respectively drill to the respective designed depth, so that a plurality of round step-shaped drill holes can be formed; in the drilling process of each drilling tool, the middle sleeve drilling tool performs reciprocating up and down/single rotary extrusion in a pile hole soil extrusion area, and the rotary dumping/single extrusion and expansion of the central drilling tool are absorbed for multiple times until the upper and lower compactness of the wall of the whole pile hole is relatively balanced; and starting a concrete pump to press and pour concrete, sequentially lifting the upper power drilling tool, the middle power drilling tool and the guide linkage drilling tool while pressing and pouring the concrete, synchronously lifting the bottom ends of the power drilling tools after being aligned in sequence until the elevation of the orifice is mentioned, and simultaneously pressing and pouring the concrete to form the pile to the designed elevation so as to finish hole forming and concrete pressing and pouring pile forming at one time.

Adopt above-mentioned technical scheme, the utility model discloses following beneficial effect has:

the utility model provides a screw-thread fit type multi-power guide composite drilling tool, which comprises a guide linkage drilling tool, a middle power drilling tool and an upper power drilling tool, wherein the middle power drilling tool and the upper power drilling tool of the drilling tool are respectively provided with a power mechanism, and the spiral blade on the outer side of a central core rod of the upper power drilling tool (central drilling tool) is in a screw rod external screw structure; the middle power drilling tool (middle sleeve drilling tool) is composed of a drilling tool main body with a composite function of extruding and dumping soil, and an inner screw structure is arranged on the inner side of a core pipe of the middle sleeve drilling tool; the internal screw (internal thread structure) of the middle sleeve drilling tool is screwed on the external screw of the central drilling tool, the internal screw and the external screw form a nut and screw rod relationship, the middle sleeve drilling tool can do reciprocating up and down/single rotary extrusion in a pile hole soil extrusion area under the drive of respective power mechanisms, and the soil on the central drilling tool is spirally arranged and is extruded and expanded for multiple times/single extrusion for absorption until the upper and lower compactness of the wall of the whole pile hole reaches relative balance. The guide linkage drilling tool is provided with a guide device, and the guide device can enable the guide linkage drilling tool and the middle power drilling tool to realize guide linkage. The composite drilling tool is used for construction, so that each drilling tool is converted into a mode of active driving and linkage assistance from a traditional linkage mode, soil squeezing and soil discharging are simultaneously carried out, pore forming and concrete pressure filling pile forming can be completed at one time, the automation degree is high, and the work efficiency is improved; the pile body is reasonably changed in diameter, and the proper construction method further improves the bearing capacity of a single pile, reduces the settlement amount, reduces the cost and shortens the construction period; the technology has strong adaptability and is beneficial to popularization and application.

The utility model provides a type stake according to compound drilling tool preparation of many powers of screw-thread fit formula guide, its bearing capacity not only includes the stake side frictional resistance and the pile tip end load of traditional pile body, the radius platform inclined plane of radius step type body moreover, can be decomposed into the tangential force and the normal force on round platform inclined plane to the perpendicular decurrent power of part, stake week soil forms passive compressive stress state and crowded state that expands, the frictional resistance all around has been increased, the bearing capacity of single pile has been improved, can reduce the settlement volume. The bearing capacity of the shallow part inverted platform part of the pile can be calculated by a shallow foundation bearing capacity formula of a Taisha foundation (Terzaghi). Simultaneously the utility model discloses a provide for solving the bad effect that crowded combined drilling tool earth work method defect caused, aim at provides a generalized crowded combined drilling tool that arranges soil that is used for compound foundation pile or pile foundation pile. Through the composite drilling tool superposition and mutual sleeving combined construction, soil squeezing and soil discharging are carried out simultaneously, but mutual cooperative support is realized, the middle sleeve drilling tool can be used for reciprocating up and down/single rotary squeezing in a pile hole soil squeezing area, soil on the rotary discharging of the central drilling tool is squeezed and expanded for multiple times/single time to be absorbed until the upper and lower compactness of the wall of the whole pile hole reaches relative balance, and hole forming and concrete pressure filling pile forming can be completed at one time, the automation degree is high, and the work efficiency is improved; the pile body is reasonably changed in diameter, and the proper construction method further improves the bearing capacity of a single pile, reduces the settlement amount and further reduces the engineering cost; the comprehensive factors shorten the construction period.

The utility model provides a preparation method, the method combines the extruding and dumping composite overlapped drilling tool with the power mechanism and the guide device, according to the requirement of the stratum to the geotechnical engineering method, the upper power drilling tool, the middle power drilling tool and the guide linkage drilling tool respectively drill to the respective designed depth, thereby forming a plurality of inverted step-shaped drilling holes; in the drilling process of each drilling tool, the middle sleeve drilling tool can perform reciprocating/single rotary extrusion up and down in the pile hole soil extrusion area, and the soil on the rotary arrangement of the central drilling tool is extruded and expanded for multiple times/single time to be absorbed until the upper and lower compactness of the wall of the whole pile hole is relatively balanced. Starting the concrete pump, starting to press-pour the concrete, sequentially lifting the upper power drilling tool, the middle power drilling tool and the guide linkage drilling tool while pressing-pouring the concrete (lifting the upper power drilling tool by adopting a synchronous technology in a reverse rotation manner until the drill bit end is aligned with the bottom end of the middle sleeve drilling tool and then finishing the synchronous technology in a reverse rotation manner), synchronously lifting the bottom ends of the drilling tools after being aligned in sequence until the elevation of the orifice is mentioned, simultaneously pressing-pouring the concrete to form the pile to the designed elevation, and realizing one-time completion of hole forming and pressing-pouring of the concrete to form the pile with the structure and the function.

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 schematic view of an initial state structure of a thread-fit type multi-power guide composite drilling tool according to an embodiment of the present invention;

fig. 2 is a schematic structural view of a drilling state of the thread-fit multi-power guide composite drilling tool provided by the embodiment of the invention;

fig. 3 is a schematic structural diagram of an upper power drill according to an embodiment of the present invention;

FIG. 4 is a partially enlarged schematic view of a thread-fitting type multi-power guiding composite drilling tool;

fig. 5 is a schematic front structural view of an upper power head provided in an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a medium power drill according to an embodiment of the present invention;

fig. 7 is a schematic front structural view of a middle power head provided in an embodiment of the present invention;

fig. 8 is a schematic structural view of a guide linkage drilling tool according to an embodiment of the present invention;

fig. 9 is a schematic view of an initial state of the position guide mechanism according to the embodiment of the present invention;

fig. 10 is a schematic view illustrating a working state of the phase lock of the position guide mechanism according to the embodiment of the present invention;

fig. 11 is a schematic view illustrating a working state of a drilling tool of the drilling machine aligned with a pile position according to an embodiment of the present invention;

fig. 12 is a schematic view of the working state of the power drill in the power drill assistance on the drilling machine according to the embodiment of the present invention;

fig. 13 is a schematic view illustrating a working state in which a drill guide linkage drilling tool and a middle power drilling tool provided by the embodiment of the present invention are locked by a guide linkage device;

fig. 14 is a schematic view of a working state in which a power drill and a guide linkage drill synchronously drill to a preset pile depth with the aid of an upper power drill in a drilling machine provided by an embodiment of the present invention;

fig. 15 is a schematic view of a working state in which a power drill in the drilling machine provided by the embodiment of the present invention reverses and drives a guide linkage drill to synchronously lift to a standard height of a pile hole;

fig. 16 is a schematic view of the working state that the upper and middle power drills and the guide linkage drill of the drilling machine provided by the embodiment of the present invention synchronously drill to the depth of the respective preset pile;

fig. 17 is a schematic view of a working state in which the upper power drill is reversely rotated and lifted to be flush with the bottom end of the middle power drill when the concrete pump is used for grouting concrete in an embodiment of the present invention;

fig. 18 is a schematic view of the working state of the concrete pump for pumping and grouting concrete, and simultaneously and synchronously lifting the upper and middle power drills to be flush with the bottom end of the guide linkage drill;

fig. 19 is a schematic view of the working state of the concrete pump for grouting concrete, synchronously lifting the upper and middle power drills and the guide linkage drill to the height of the pile hole;

fig. 20 is a schematic view illustrating a working state of a drilling tool of the drilling machine aligned with a pile position according to an embodiment of the present invention; fig. 21 is a schematic view of a power drill on a drilling rig according to an embodiment of the present invention in a ready-to-drill operating state;

fig. 22 is a schematic view of an operating state of a power drill on a drilling machine according to an embodiment of the present invention in advance;

fig. 23 is a schematic view of a power drill in a drilling machine according to an embodiment of the present invention, illustrating a working state of soil squeezing and drilling with the assistance of the upper power drill in rotary dumping;

fig. 24 is a schematic view illustrating a working state in which a drill guide linkage drilling tool and a middle power drilling tool provided by the embodiment of the present invention are locked by a guide linkage device;

fig. 25 is a schematic view of a working state in which a power drill and a guide linkage drill synchronously drill to a preset pile depth with the aid of an upper power drill in a drilling machine provided by an embodiment of the present invention;

fig. 26 is a schematic view of a working state in which the power drill is reversed and drives the guide linkage drill to be synchronously lifted to the pile hole opening in the drilling machine according to the embodiment of the present invention;

fig. 27 is a schematic view of the working state that the upper and middle power drills and the guide linkage drill of the drilling machine provided by the embodiment of the present invention synchronously drill to the depth of the respective preset pile;

fig. 28 is a schematic view of the working state that the upper power drill rotates reversely and is lifted to be flush with the bottom end of the middle power drill when the concrete pump is used for grouting concrete;

fig. 29 is a schematic view of the working state of the concrete pump for pumping concrete and simultaneously and synchronously lifting the upper and middle power drills to be flush with the bottom end of the guide linkage drill;

fig. 30 is a schematic view of the working state of the concrete pump for grouting concrete, synchronously lifting the upper and middle power drills and the guide linkage drill to the height of the pile hole;

fig. 31 to 32 are schematic diagrams of different types of pile shapes provided in the embodiment of the present invention;

fig. 31 is a schematic view of an inverted circular truncated cone pile shape of each of upper and lower inverted step-shaped bodies of a threaded reducer pile at the lower part of a pile body provided in an embodiment of the present invention;

fig. 32 is a schematic view of a circular platform pile shape that only the next two inverted circular step shapes of the upper and lower threaded reducing piles of the lower part of the pile body provided by the embodiment of the present invention can be mutated.

Icon: 1, installing a power drill; 2-medium power drill; 3-guiding the position linkage drilling tool; 4-shaped piles; 5-concrete pump; 11-installing a power head; 12-a central drilling tool; 13-an upper lifting device; 14-upper limiting means; 21-a medium power head; 22-intermediate sleeve drill; 23-a medium lifting device; 25-a pressurizing device; 27-a guide linkage groove; 32-outer sleeve drill; 37-a guide linkage rod; 38-casing; 41-main body pile body; 42-a rounded step profile; 121-external thread structure; 221-internal thread construction.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings. It is to be understood that the description of the embodiments herein is for purposes of illustration and explanation only and is not intended to limit the invention.

Example one

The embodiment provides a thread fit type multi-power guiding composite drilling tool, which comprises: the guide linkage drilling tool, the middle power drilling tool and the upper power drilling tool are coaxially sleeved in sequence;

the middle power drilling tool and the upper power drilling tool are respectively provided with a power mechanism, and the power mechanisms can independently drive the corresponding drilling tools to rotate;

an external thread structure 121 is arranged on the outer side of the core tube of the upper power drill, and the external thread structure 121 is used as a helical blade of the upper power drill;

the middle power drilling tool is composed of a drilling tool main body with a soil squeezing and discharging composite function, an internal thread structure 221 is arranged on the inner side of a core tube of the drilling tool main body of the middle power drilling tool, and the internal thread structure 221 is matched with the external thread structure 121 to form threaded connection; the middle power drilling tool can reciprocate up and down/rotate and extrude once in the pile hole soil extrusion area under the driving of the power mechanism, so that the rotary soil discharge of the center drilling tool is absorbed by multiple/single extrusion and expansion. The inner screw of the middle sleeve drilling tool is spirally attached to the outer screw of the central drilling tool, the inner screw and the outer screw form a nut and screw rod relation, the middle sleeve drilling tool can perform reciprocating up and down/single-time rotary extrusion in a pile hole soil extrusion area under the drive of respective power mechanisms, the inner screw structure and the outer screw structure shield soil on the rotary arrangement of the central drilling tool at the bottom end of the middle sleeve drilling tool, and the soil is extruded and expanded in the pile hole soil extrusion area for many times/single time by the composite function of extruding and discharging soil of the middle sleeve drilling tool to be absorbed until the upper compactness and the lower compactness of the wall of the whole pile hole are. The medium power drilling tool adopts a main body of a soil squeezing and discharging composite drilling tool which mainly squeezes soil;

the upper spiral blade on the outer side of the core rod of the upper power drilling tool is in a screw rod external thread structure, and has the soil discharging/extruding function according to different drilling modes;

the guide linkage drilling tool is provided with a guide device, the guide device can enable the guide linkage between the guide linkage drilling tool and the middle power drilling tool to realize guide linkage, and a sleeve drilling tool outside the guide linkage drilling tool adopts a soil extrusion and dumping composite drilling tool main body mainly for soil extrusion/a drilling tool main body with a soil dumping function (the structure of a common spiral drilling tool);

according to the functional characteristics of the drilling tools, the soil density degree and the distribution condition of the field in the depth of the pile body are combined, and the comprehensive pile forming effect is two types: firstly, the pile is basically not unearthed; and secondly, forming part of the pile and unearthing.

Firstly, the pile is basically not excavated, and is suitable for the stratum conditions: the site soil in the depth of the pile body is soft and medium soft (or the medium hard site soil at the lower part of the pile body accounts for little or partial proportion);

secondly, the pile forming part is unearthed, and the method is suitable for the stratum condition: the upper part of the field soil in the depth of the pile body is soft and medium soft field soil, and the middle part and the lower part are medium hard field soil (the medium hard field soil is distributed in a large proportion or the majority is the medium hard field soil).

Based on the above concept and the point that is convenient for the skilled in the art to understand, the embodiment focuses on a preferred embodiment, and of course, the protection scope of the present invention is determined according to the functional characteristics of the drilling tool, the combination change of the construction method and the different piling effect.

It is worth mentioning that:

it is worth mentioning that the design of the helical blade of the drill body can be flexibly set by those skilled in the art according to actual needs. Wherein the broad meaning is to be understood herein. For example: the middle sleeve drilling tool 22 with the soil squeezing and dumping composite function has the advantages that the helical blades of the inverted circular truncated cone structure corresponding to the lowermost end of the drilling tool main body do not need to meet the rule that the outer contour is in equal-diameter distribution, and the helical blades arranged on the drill bit do not need to be arranged according to the requirement that the outer contour is in equal-diameter distribution because the inverted circular truncated cone structure can be used as a drill bit approximately. Of course, the positions above the inverted circular truncated cone structure can meet the rule that the outer contour of the helical blade is distributed in an equal diameter mode.

Referring to fig. 1 to 10, the present embodiment provides a thread-fitting type multi-power guiding composite drilling tool, which includes: the guide linkage drilling tool 3, the middle power drilling tool 2 and the upper power drilling tool 1 are coaxially sleeved in sequence (sequentially overlapped and sleeved from outside to inside); the upper power drilling tool 1 and the middle power drilling tool 2 are respectively provided with a power mechanism, and the power mechanisms can independently drive the corresponding drilling tools to rotate; particularly, the screw in the middle sleeve drilling tool 22 is spirally attached to the screw on the outer screw of the central drilling tool 12, the nut and the screw form a relationship, the middle sleeve drilling tool 22 can do reciprocating up and down/single-time rotary extrusion in the pile hole soil extrusion area under the drive of respective power mechanisms, the inner and outer screw structures shield the soil on the rotary row of the central drilling tool 12 at the bottom end of the middle sleeve drilling tool, and the soil extrusion and discharge composite function of the middle sleeve drilling tool 22 is repeated/single-time for absorption and absorption in the pile hole soil extrusion area by up and down extrusion and expansion until the upper and lower compactness of the wall of the whole pile hole reaches relative balance; the guide linkage drilling tool 3 is provided with a guide device, the guide device can enable the guide linkage drilling tool 3 and the middle power drilling tool 2 to realize guide linkage, and accordingly, each drilling tool is converted from a passive linkage mode into an active driving and linkage auxiliary mode, the automation degree is high, the adaptability is strong, and popularization and application are facilitated. At least the middle power drilling tool 2 in the guide linkage drilling tool 3 and the middle power drilling tool 2 is composed of a drilling tool main body with a soil extruding and discharging composite function, and the outer diameter of a middle core pipe of the drilling tool main body is gradually increased from bottom to top and is changed according to a preset soil extruding ratio; the squeeze ratio is defined as the ratio of the outside diameter of the center core tube to the diameter of the drill body; the width of the helical blades of the drilling tool main body is gradually reduced from bottom to top, so that the outer contours of all the helical blades are distributed in an equal diameter mode (the size of the outer contour of each helical blade is the diameter of the drilling tool main body).

It is worth mentioning that:

firstly, for a drilling tool main body mainly based on soil extrusion (the drilling tool main body with the soil extrusion and displacement combined function), the ratio of the outer diameter of the central core pipe to the diameter of the drilling tool main body (which can be understood as the maximum diameter of the drilling tool main body) is gradually increased from bottom to top, wherein the ratio is defined as the soil extrusion ratio of the soil extrusion drilling tool section, the numerical range of the soil extrusion ratio of the soil extrusion drilling tool is 0.6-1.0, and the soil extrusion ratio of the soil extrusion drilling tool is gradually changed from bottom to top from small to large. Preferably, the ratio of the outer diameter of the central core pipe to the diameter of the drilling tool is gradually increased from bottom to top, the minimum soil squeezing ratio is not less than 0.6, (the soil squeezing ratio of the drilling tool is not less than 0.6, the drilling tool mainly squeezes soil.) the soil squeezing ratio of the soil squeezing drilling tool is gradually increased from bottom to top, and the maximum soil squeezing ratio is 1.0 (namely the light rod section). The thickness of the blade meets the strength requirement, the width of the blade is gradually reduced from bottom to top until the blade is not changed into a polished rod section, a proper screw diameter ratio is selected to control the pitch width, the blade is suitable for rotating and discharging soil, and the outer diameter of the central core pipe is thickened from bottom to top according to a certain gradient. The soil-squeezing ratio of the drilling tool is 1.0, and the polished rod section has the functions of prolonging the soil-squeezing drilling tool, supporting the side wall of the hole and preventing the hole wall from loosening. The drilling tool mainly extrudes soil when forming holes.

Secondly, for a drilling tool main body mainly used for dumping (a drilling tool main body with a combined function of squeezing and dumping), the ratio of the outer diameter of the central core pipe to the diameter of the drilling tool main body (which can be understood as the maximum diameter of the drilling tool main body) is gradually increased from bottom to top, the ratio is defined as a soil squeezing ratio, and the numerical range of the soil squeezing ratio is less than 0.6; wherein, the soil squeezing ratio of the soil discharging drilling tool gradually changes from small to large from bottom to top or takes a certain value. Preferably, the ratio of the outer diameter of the central core pipe to the diameter of the drilling tool is gradually increased from bottom to top, and the maximum soil extrusion ratio is less than 0.6. (note: the soil-discharging drill is used when the soil-squeezing ratio of the drill is less than 0.6) the soil-squeezing ratio of the soil-discharging drill gradually changes from small to large from bottom to top, and can also be a certain value. The width of the blade gradually changes from large to small from bottom to top, and can also be a fixed value. The thickness of the blade meets the strength requirement, and the pitch width is controlled by selecting a proper screw diameter ratio to be suitable for soil rotation and upward discharging. The outer diameter of the central core tube is increased from bottom to top by a certain gradient, or a certain value. The hole forming of the drilling tool is mainly realized by dumping.

In other words, in the drill body having the combined function of extruding and discharging soil, the outer diameter of the core tube is gradually increased from bottom to top and is changed according to a predetermined soil extrusion ratio, the soil extrusion ratio is defined as the ratio of the outer diameter of the core tube to the diameter of the drill body (the diameter of the drill body is always a constant value), and the width of the helical blades of the drill body is gradually decreased from bottom to top so that the outer profiles of all the helical blades are distributed in an equal diameter (the size of the outer profile of the helical blade is the diameter of the drill body). The drilling tool main body with the soil squeezing and discharging composite function can be divided into a soil squeezing drilling tool section and a soil discharging drilling tool section, and the soil squeezing drilling tool section and the soil discharging drilling tool section are integrally connected from top to bottom to form the drilling tool main body with the soil squeezing and discharging composite function. Certainly, the numerical range of the soil squeezing ratio of the soil squeezing drilling tool section is 0.6-1.0, and the soil squeezing ratio of the soil squeezing drilling tool gradually changes from small to large from bottom to top; the numerical range of the soil extrusion ratio of the soil discharge drilling tool section is less than 0.6; wherein, the soil squeezing ratio of the soil discharging drilling tool gradually changes from small to large from bottom to top or takes a certain value.

It is worth mentioning that the design of the helical blade of the drill body can be flexibly set by those skilled in the art according to actual needs. Wherein the broad meaning is to be understood herein. For example: when the outer sleeve drilling tool 32 and the middle sleeve drilling tool 22 have the combined function of extruding and dumping soil, the helical blades of the inverted frustum structure corresponding to the lowermost end of the drilling tool body do not need to meet the rule that the outer contour is in equal-diameter distribution, and because the frustum structure can be approximately used as a drill bit, the helical blades arranged on the drill bit do not need to be arranged according to the requirement that the outer contour is in equal-diameter distribution. Of course, the positions above the inverted circular truncated cone structure can meet the rule that the outer contour of the helical blade is distributed in an equal diameter mode.

In this embodiment, in order to ensure that the external thread structure can better act as a helical blade.

For example: the design diameter of the central drilling tool is 400mm, and then the thread pitch and the thread structure of the external thread structure are as follows: the pitch between the external thread structures 121 (the distance between adjacent external threads) is 350-: 0.875-1.0. For example: the thread height (the distance between the outer edge of the external thread structure and the surface of the core tube) of the external thread structure 121 is 50mm, and the soil extrusion ratio: 0.75. for example: the inner side of the thread thickness of the external thread structure 121 is 100mm, and the outer side of the thread thickness of the external thread structure is 50 mm.

As a further technical solution, the pilot linkage drilling tool 3 includes: an outer sleeve drill 32 and a first guide linkage-guide linkage rod 37; the first guide linkage device-guide linkage rod 37 is provided with a guide column on the peripheral surface, the first linkage device is provided with a guide column on the peripheral surface, and the outer sleeve drilling tool 32 adopts a soil extrusion and dumping composite drilling tool main body mainly based on soil extrusion.

The outer sleeve drilling tool 32 is provided with a casing 38, and the perpendicularity of the outer sleeve drilling tool 32 is kept by horizontally fixing slips on the casing 38 and a drilling tower;

in the case of the outer sleeve drill 32, a third helical blade is provided on the outer sleeve drill 32, and the third helical blade is provided on the outer wall of the outer sleeve drill 32 in the axial direction of the outer sleeve drill 32.

It is worth to be noted that the guide linkage drilling tool 3 can be composed of a plurality of overlapped sleeves according to the design requirement. When a plurality of guide linkage drilling tools 3 are overlapped, the structures are the same except the diameters and the lengths of sleeves (except the lowest guide linkage drilling tool, other guide linkage drilling tools are provided with a second linkage device-guide linkage groove).

As a further technical solution, it is preferable that the medium power drill 2 includes: a medium power head 21, a medium sleeve drill 22 and a medium lifting device 23; the middle power head 21 is arranged at the upper end of the middle sleeve drilling tool 22 and used for driving the middle sleeve drilling tool 22 to rotate, and an internal thread structure 221 is arranged on the inner side of a core tube of the middle sleeve drilling tool; the middle lifting device 23 is arranged at the lower end of the middle power head 21 and is used for driving the guide linkage drilling tool 3 to perform lifting action; the guiding device comprises a second linkage device-guiding linkage groove 27 arranged on the middle sleeve drilling tool 22, and a guiding groove and a guiding ridge surface are arranged at the upper part of the second linkage device-guiding linkage groove 27; when the guide ridge surface is contacted with the guide posts on the guide linkage rod 37, the guide posts can rotate along the guide ridge surface to enter the guide groove inlet and move up to the horn mouth of the guide groove passively, so that the guide linkage rod 37 accurately enters the guide linkage groove 27, and the linkage device is locked in a sleeving manner.

The middle sleeve drill 22 is a main body of a soil squeezing and discharging composite drill mainly for squeezing soil.

In the present embodiment, as a further technical solution, the guide groove is provided on the outer wall of the guide linking groove 27 along the axial direction of the guide linking groove 27, and the guide groove has an expanded bottom, for example: the horn mouth shape, the linkage system during operation, the protection guide post avoids collision damage, and the guide post reduces the friction with the guide way when the linkage system breaks away from.

In this embodiment, as a further technical solution, an upper edge of the guide ridge surface has an inclined arc-shaped ramp for contacting with the guide post.

In this embodiment, as a further technical solution, the number of the guide grooves is two, and the two guide grooves are respectively disposed at the circumferential bisection positions of the second guide linkage groove.

There are various ways for the intermediate lifting device 23.

For example: the middle lift device 23 includes: and the winch is arranged at the lower end of the middle power head 21, and a traction rope of the winch (a telescopic cylinder can also be arranged at a proper height of a drilling rig of the drilling machine) is connected with the guide linkage drilling tool 3 (preferably the pile casing 38).

Another example is: the middle lift device 23 includes: and the telescopic cylinder (oil cylinder) is arranged at the lower end of the middle power head 21, and the telescopic rod of the telescopic cylinder is connected with the guide linkage drilling tool 3 (preferably the pile casing 38).

For the middle sleeve drilling tool 22, the middle sleeve drilling tool 22 is provided with a second helical blade, the second helical blade is arranged on the outer wall of the first sleeve drilling tool along the axial direction of the first sleeve drilling tool, and the inner side of the core tube of the middle sleeve drilling tool is provided with an internal thread structure.

As a further technical solution, the upper power drill 1 includes: an upper power head 11, a central drilling tool 12 and an upper lifting device 13; the upper power head 11 is arranged at the upper end of the central drilling tool 12 and is used for driving the central drilling tool 12 to rotate; the upper lifting device 13 is arranged at the lower end of the upper power head 11 and used for driving the middle power drilling tool 2 to perform lifting action. The spiral blade form on the central drilling tool 12 well core rod outside is the lead screw external screw structure (external screw thread structure 121), has the soil discharging/crowded native function according to the form difference of creeping into, the numerical range of crowded native ratio of drilling tool is not less than 0.6 and is less than 1.0 and is a definite value.

The upper power head 11 is basically similar to the power head 21 in structure and form, and is additionally provided with a grouting (concrete) elbow joint (one end of the elbow is communicated with a central core pipe of the central drilling tool, and the other end of the elbow is connected with a concrete conveying high-pressure hose), and the upper part of the top of the power head is also provided with a lifting point which is connected with a main winch of a drilling machine through a steel wire rope.

There are various ways for the upper lifting means 13.

For example: the upper lifting device 13 includes: and the winch is arranged at the lower end of the upper power head 11, and a traction rope of the winch is connected with the middle power drilling tool 2 (preferably the middle power head 21).

Another example is: the upper lifting device 13 includes: and the telescopic cylinder (oil cylinder) is arranged at the lower end of the upper power head 11, (the telescopic cylinder can also be arranged at a proper height of a drilling rig), and the telescopic rod of the telescopic cylinder is connected with the middle power drilling tool 2 (preferably the middle power head 21).

As a further technical solution, the upper power drill 1 further includes: an upper limit device 14; the upper limiting device 14 is arranged at the lower end of the upper power head 11. There are many ways for the upper limiting device 14. For example: the upper limiting device 14 may be a rigid connecting rod, the length of which is flexibly set according to the actual situation. The telescopic connecting rod can also be used, and the length of the telescopic connecting rod can be adjusted freely according to requirements.

In addition, this embodiment further includes: and the pressurizing device 25, wherein the pressurizing device 25 is arranged above the middle power drilling tool 2.

Of course, the pressure device 25 can be flexibly arranged according to the characteristics of the power mechanism, geological conditions and design requirements, and preferably, the pressure device 25 can be a winch arranged on the drilling platform, and a traction rope of the winch is connected with the middle power drilling tool 2 (the middle power head 21) through a guide wheel. The pressurizing device 25 can also be a hydraulic oil cylinder, the cylinder barrel of the oil cylinder is fixedly arranged at a proper position of the drilling tower, and the top end of the piston rod of the oil cylinder is connected with the middle power drilling tool 2 (the middle power head 21). The pressurizing device 25 may also be a chain driven by a speed reducer, the speed reducer is arranged on a drilling rig platform or a drilling tower, one end of the chain is linked to a gear of the speed reducer, and the other end of the chain is fixed on the middle power drilling tool 2 (the middle power head 21), or the other end of the chain is fixed at a proper position of the drilling rig after the middle power drilling tool 2 (the middle power head 21) is provided with a movable pulley (a gear).

The specific form of the power mechanism for the drilling tool is not limited, and the prior art forms can be followed.

For example: go up the unit head and include: the power box, the motor, the speed reducer and the concrete conveying pipe; the power box is provided with a hoisting pulley block, a sliding shoe and a pressurizing pulley block, the speed reducer is connected with the motor/motor, the motor/motor and the speed reducer are installed on the power box, the concrete conveying pipe is connected with the hollow central shaft of the speed reducer in a rotatable and sealed mode, the hollow central shaft of the speed reducer is connected with the central drilling tool through the output flange, and after the speed of the motor rotates at a high speed and is reduced through the speed reducer, the power input of the speed reducer is provided for the central drilling tool. Wherein, the concrete delivery pipe, the hollow central shaft of the speed reducer are communicated with the hollow channel of the central drilling tool.

For example: well unit head includes: power boxes, motors/motors and reducers; the power box is provided with a hoisting pulley block, a sliding shoe and a pressurizing pulley block, the speed reducer is connected with the motor/motor, the motor/motor and the speed reducer are installed on the power box, a central shaft of the speed reducer is connected with the middle sleeve drilling tool through an output flange, and after the speed of the motor is reduced through the speed reducer, the power input of the speed reducer is provided for the middle sleeve drilling tool. Wherein, the concrete delivery pipe, the hollow central shaft of the speed reducer are communicated with the hollow channel of the central drilling tool.

Of course, there may be other specific configurations for each power head, and no examples are given here.

Example two

Referring to fig. 11 to 19 and 20 to 30, the second embodiment further provides two methods for preparing the pile 4 according to different soil conditions of the site by using the thread-fitting type multi-power composite drilling tool, which include: according to the requirement of the stratum on a construction method, the upper power drilling tool 1, the middle power drilling tool 2 and the guide linkage drilling tool 3 respectively drill to the respective designed depth, so that a plurality of round step-shaped drill holes can be formed; during the drilling process of each drilling tool, the middle sleeve drilling tool 22 can perform reciprocating/single rotary extrusion up and down in the pile hole soil extrusion area, and the soil on the rotary row of the central drilling tool 12 is extruded and expanded for multiple times/single extrusion and expansion to be absorbed until the upper and lower compactness of the wall of the whole pile hole reaches relative balance. And starting a concrete pump 5 to start pressure filling of concrete, sequentially lifting the upper power drilling tool 1, the middle power drilling tool 2 and the guide linkage drilling tool 3 while pressure filling of the concrete (lifting the upper power drilling tool 1 in a reverse rotation manner by adopting a synchronous technology until the drill bit end is aligned with the bottom end of the middle sleeve drilling tool 22 and then finishing the reverse rotation of the synchronous technology), sequentially aligning the bottom ends of the power drilling tools and then synchronously lifting until the elevation of the orifice is mentioned, and simultaneously pressure filling the concrete into a pile to reach the designed elevation to realize one-time pore forming and concrete pressure filling pile forming.

In the treatment of building structures or soft foundations such as railways, highways and the like, the foundation soil of the site soil to be treated can be generally divided into soft and weak site soil (the average shear wave velocity of the soil layer is less than or equal to 140m/s), medium and soft site soil (the average shear wave velocity of the soil layer is more than 140m/s and less than or equal to 250m/s), medium and hard site soil (the average shear wave velocity of the soil layer is more than 250m/s and less than or equal to 500m/s) and hard site soil (the shear wave velocity of the soil layer is more than 500m/s) from shallow to deep according to the change rule of the.

According to the loose and dense degree of field soil and the distribution condition of each soil layer in the depth range of a pile body, the soil and soil engineering method idea of 'loose and dense arrangement' is combined, and the pile forming effect matched with the thread fit type multi-power composite drilling tool combination form is divided into two types: firstly, the pile is basically not unearthed; and secondly, forming part of the pile and unearthing.

Firstly, the pile is basically not excavated, and is suitable for the stratum conditions: the site soil in the depth of the pile body is soft and medium soft site soil (or the medium hard site soil at the lower part of the pile body occupies little or partial proportion);

the site soil within the depth range of the pile body is soft and medium soft site soil, and the construction method adopts soil extrusion; the screw-thread matching type multi-power composite drilling tool is matched with a soil squeezing section drilling tool as a leading part, the soil discharging section drilling tool is matched with the soil squeezing section drilling tool, and soil discharging is also used as a soil squeezing service principle.

The soil squeezing ratio of the central drilling tool is not less than 0.6 and less than 1.0 and is a certain value, the screw diameter ratio is suitable for soil discharging and is beneficial to soil squeezing, the screw pitch is equidistant, the effective length is not less than the soil thickness of a treatment site, and the specific value is finally determined according to the design requirement and the stratum condition;

the middle sleeve drilling tool and the outer sleeve drilling tool are soil-squeezing drilling tools, a soil-squeezing-and-dumping drilling tool which mainly squeezes soil is adopted, the soil-squeezing ratio is mainly a soil-squeezing section which is not less than 0.6 and not more than 1.0, the soil-squeezing ratio is gradually changed from small to large to 1.0 from bottom to top, the length of the soil-squeezing-and-dumping section or the change degree of the soil-squeezing ratio is determined according to the compactness of soil in soft and medium-soft fields to be processed and the output torque of a power mechanism of the drilling machine, and the soil-squeezing ratio of the drilling tool is 1.0 and is a polished rod section. The screw diameter ratio is suitable for extruding soil, the screw pitch can be equidistant, and the screw pitch is gradually changed from bottom to top and from large to small. The effective length of the middle sleeve drilling tool is generally not more than half of the thickness of the soil of a treatment site, and the specific value is finally determined according to the design requirement and the stratum condition; the length of the outer sleeve drilling tool is smaller than that of the middle sleeve drilling tool, the effective length of the outer sleeve drilling tool is preferably not larger than 4 times of the diameter of the pile top, and the specific value is finally determined according to the design requirement and the stratum condition.

The function of the central drilling tool determines the working efficiency of the construction method according to the drilling form, and a reasonable drilling form is adopted according to the stratum compactness condition. And for soft site soil and medium soft site soil in the range of the pile body, combining the soil absorption capacity and design requirements of a medium power drilling tool and a lower power drilling tool, controlling the rotary soil discharge amount, and then adopting screw thread soil squeezing drilling to drill to a designed depth or drilling into medium hard site soil for a plurality of drill stops.

The middle sleeve drilling tool and the outer sleeve drilling tool are soil squeezing and discharging drilling tools mainly for squeezing soil;

the soil squeezing area is as follows: soft field soil, medium soft field soil;

during pore-forming, the bottom ends of the middle sleeve drilling tool and the central drilling tool are drilled in a follow-up mode, a slow-down drilling mode is adopted, the drilling tools are screwed and drilled in a soil-squeezing area in advance, after the middle sleeve drilling tool and the outer sleeve drilling tool synchronously squeeze soil and drill to respective preset depths, the middle sleeve drilling tool rotates reversely and drives the outer sleeve drilling tool to lift to a pile hole opening synchronously, a space is reserved for rotary dumping, the central drilling tool continuously drills in a soil-dumping mode, deep soil of a pile hole is discharged to the upper portion of the pile hole in a rotary mode, the middle sleeve drilling tool is mainly used for reciprocating/single rotary squeezing from top to bottom in the soil-squeezing area of the pile hole, and soil on the rotary dumping of the central drilling tool is squeezed and expanded for multiple times/single times until the upper and. When the power center drilling tool drills to the designed depth or drills into a plurality of medium-hard field soil, other power drilling tools simultaneously drill to the respective preset depth in the soil squeezing area in a soil squeezing mode, then the drilling is stopped, concrete is poured into the core pipe in a medium pressure mode, the power drilling tools are sequentially lifted (when the power drilling tools are lifted, the synchronous technology is adopted for reverse lifting, the synchronous technology is finished for reverse lifting until the drill bit end is level with the bottom end of the middle sleeve drilling tool), the bottom ends of the power drilling tools are sequentially level and then synchronously lifted until the orifice elevation is mentioned, and meanwhile, the concrete is also poured into the pile to the designed elevation in a pressure mode.

After the hole-forming pouring pile is formed, the soil in the soil-squeezing area in the pile hole is squeezed and expanded, proper amount of rotary dumping soil is absorbed in the wall of the soil-squeezing area, the soil in the middle lower part of the pile hole is spirally dumped to the upper soil-squeezing area by the central drilling tool, and the soil-squeezing section is repeatedly/single-time gradually rotated, squeezed and expanded and absorbed in the wall of the pile hole, so that the side frictional resistance of the wall of the pile hole is enhanced.

The conditions of no unearthing after pile forming are as follows: the middle and outer sleeve drilling tools have the capabilities of squeezing soil and absorbing soil (including torque power and pressure of a power head), the range and depth of a soil squeezing area and the soil compactness of the part, and the soil discharge amount of the upper power drilling tool, and the conditions are matched with each other to form a hole normally and form a pile without soil discharge.

The field soil in the depth of the pile body is soft and medium soft field soil (or the medium hard field soil in the lower part of the pile body occupies little or partial proportion), the torque capacity of the middle and outer sleeve drilling tools is not enough to absorb the soil discharge amount of the upper power drilling tool in the designed soil squeezing range and depth, and after the soil compactness in the range and the depth of the upper soil squeezing area reaches the design requirements, the upper power drilling tool is used for drilling in a thread soil squeezing mode until the designed depth is reached.

Secondly, the pile forming part is unearthed, and the method is suitable for the stratum condition:

the upper part of the field soil in the depth of the pile body is soft and medium soft field soil, and the middle part and the lower part are medium hard field soil (the medium hard field soil is distributed in a large proportion or the majority is the medium hard field soil). The site soil within the depth range of the pile body is soft and medium soft site soil, and the construction method adopts soil extrusion; the construction method adopts the soil removal for medium-hard field soil.

The soil squeezing ratio of the central drilling tool is not less than 0.6 and less than 1.0 and is a certain value, the screw diameter ratio is suitable for soil discharge, the screw pitch is equidistant, the effective length of the screw is not less than the soil thickness of a treatment site, and the specific value is finally determined according to design requirements and stratum conditions.

The middle sleeve drilling tool and the outer sleeve drilling tool adopt a soil squeezing and dumping drilling tool which mainly squeezes soil, the soil squeezing ratio is mainly a soil squeezing section which is not less than 0.6 and not more than 1.0, the soil squeezing ratio is gradually changed from small to large from bottom to top to 1.0, the length of the soil squeezing and dumping section or the change degree of the soil squeezing ratio is determined according to the compactness of soil in weak and medium-soft fields to be processed and the output torque of a power mechanism of the drilling machine, and the soil squeezing ratio of the drilling tool is 1.0 and is a polished rod section. The screw diameter ratio is suitable for extruding soil, the screw pitch can be equidistant, and the screw pitch is gradually changed from bottom to top and from large to small. The effective length of the middle sleeve drilling tool is generally slightly larger than the thickness of the soil in the soft and medium-soft field, and the specific value is finally determined according to the design requirement and the stratum condition; the length of the outer sleeve drilling tool is smaller than that of the middle sleeve drilling tool, the length of the outer sleeve drilling tool is preferably not larger than 4 times of the diameter of the pile top, and the specific value is finally determined according to design requirements and stratum conditions.

Drilling by the central drilling tool in a dumping mode;

the soil squeezing area is as follows: soft field soil, medium soft field soil;

the soil discharge area is as follows: medium hard field soil.

When in pore forming, the central drilling tool discharges partial redundant pile hole soil in a rotary mode according to the variable diameter geometric dimension of the upper part of the pile and the soil absorption capacity of the middle power drilling tool and the guide linkage drilling tool in advance, after the drilling is carried out at a plurality of depths, the middle sleeve drilling tool and the outer sleeve drilling tool follow up successively, the central drilling tool drills in a soil discharge mode at the moment, the soil in the deep part of the hole is discharged to the upper part of the hole in a rotary mode, the middle sleeve drilling tool is mainly used for reciprocating/single rotary extrusion from top to bottom in the pile hole soil extrusion, the soil on the central drilling tool is discharged in a rotary mode for multiple/single extrusion and expansion to be absorbed until the upper and lower compactness of the wall. When the power center drilling tool reaches the designed depth in the soil discharging area, other drilling tools simultaneously drill to the respective preset depth in the soil squeezing area in a soil squeezing mode, then the drilling is stopped, concrete is poured into the central core pipe in a medium pressure mode, the power drilling tools are sequentially lifted (the power drilling tools are lifted in a reverse rotation mode by adopting a synchronous technology when being lifted, the synchronous technology is finished in the reverse rotation mode after the drill bit end is aligned with the bottom end of the middle sleeve drilling tool), the bottom ends of the drilling tools are synchronously lifted after being aligned in sequence until the elevation of the orifice is mentioned, and meanwhile, the concrete is also poured into the pile to the designed elevation by pressure.

After the hole-forming pouring pile is formed by the squeezing and dumping drilling tool combination mainly by squeezing, the soil in the weak and medium-soft field in the pile hole is squeezed and squeezed, and a proper amount of rotary dumping soil is absorbed in the wall of the soil-squeezing area; the hard field soil in the middle and lower parts of the pile hole is spirally discharged to the upper soil squeezing area by the central drilling tool, and is mainly squeezed and discharged by the middle sleeve drilling tool, and the soil is repeatedly/gradually spirally discharged, squeezed and expanded once and absorbed in the wall of the pile hole, so that the side frictional resistance of the wall of the pile hole is enhanced.

The conditions of no unearthing after pile forming are as follows: the middle and outer sleeve drilling tools have the capabilities of squeezing soil and absorbing soil (including torque power and pressure of a power head), the range and depth of a soil squeezing area and the soil compactness of the part, and the soil discharge amount of the upper power drilling tool, and the conditions are matched with each other to form a hole normally and form a pile without soil discharge. The rotary soil discharge within the depth range of the soil squeezing area is squeezed for multiple times and squeezed to reach the maximum relative compactness, the soil discharge amount of a power drill cannot be completely absorbed, and only the redundant pile hole soil is discharged outside an orifice in a rotary manner in advance, and then the rotary soil discharge is absorbed by the soil squeezing area. The field soil within the depth range of the pile body is mainly medium-hard field soil, the weak and medium-soft field soil at the upper part of the pile body accounts for little or partial proportion, the diameter-changing condition and the depth of the upper part of the pile are determined according to the soil-squeezing and soil-absorbing capacity of the middle and outer sleeve drilling tools, the soil-squeezing area range, the soil compactness condition in the depth and the soil discharge amount of the upper power drilling tool, and the redundant pile hole soil outside the discharge hole opening is calculated so as to ensure that the upper power drilling tool drills to the designed depth in the soil discharge mode from beginning to end.

For the field soil within the depth range of the pile body, the upper part of the pile body is soft and medium soft field soil, the lower part of the pile body is medium and hard field soil, the soft and hard field soil is basically distributed in half by half, and according to the soil squeezing and absorbing capacity of a middle sleeve drilling tool and an outer sleeve drilling tool, the soil squeezing area range, the soil compactness condition in the depth, the soil discharging amount of an upper power drilling tool and the comprehensive conditions, two effects of no soil discharging or partial soil discharging can occur during pile forming construction according to different design requirements.

For the case of the variable diameter pile thread:

because the middle sleeve drilling tool and the central drilling tool rotate and move up and down in a screwing mode, the relation between the nut and the screw rod is formed, in view of the pressure filling pile process requirement, the central drilling tool needs to be synchronously reversely rotated and lifted when lifting pressure filling concrete to form a pile, and the synchronous technical reverse rotation is finished until the drilling head end is flush with the bottom end of the middle sleeve drilling tool, so that the pile body formed by the central drilling tool is provided with threads.

The pile top first variable diameter pile body hole forming method adopts an extrusion and dumping drilling tool which mainly adopts extrusion, and the pile top pile body has no screw thread; the method of discharging soil (mainly looking at the degree of compaction of the middle sleeve drill on the wall soil of the pile hole) can be adopted, and the pile body of the pile top is also free of threads.

Because the function requirement and the internal structure condition of the middle sleeve drilling tool, the middle sleeve drilling tool can only adopt an extrusion-mainly soil-discharging drilling tool to perform reciprocating rotary extrusion up and down in a pile hole, and the middle sleeve drilling tool forms a pile body main body without threads.

EXAMPLE III

Referring to fig. 31 to 32, the present embodiment further provides a profile pile 4 prepared by using the thread-fitting type multi-power guide composite drilling tool, including: a main body pile body 41; at least two inverted step-shaped bodies 42 are arranged on the main body pile body 41; the included angle scope of the bus extension line of the reducing position of the inverted round step-shaped body 42 and the central axis of the main pile body 41 is as follows: 5 to 90 degrees. For example: the reducing part of the inverted round step-shaped body 42 is positioned at the shallow part of the pile body, and the included angle range value of the extension line of the bus at the reducing part of the inverted round step-shaped body 42 and the central axis of the main pile body 41 is preferably 30-45 degrees. Another example is: the reducing part of the inverted round step-shaped body 42 is positioned at the deep part of the pile body, and the included angle range between the extension line of the bus at the reducing part of the inverted round step-shaped body 42 and the central axis of the main pile body 41 is 5-90 degrees (for example, 30 degrees, 45 degrees, 60 degrees and 75 degrees).

Further, the main body pile 41 may have various forms.

The main body pile body 41 is provided with two inverted step-shaped bodies 42 which are divided into a first pile body, a second pile body and a third pile body from top to bottom, wherein the third pile body has a threaded structure.

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

1. The utility model provides a compound drilling tool of many power guide of screw-thread fit formula which characterized in that includes: the guide linkage drilling tool, the middle power drilling tool and the upper power drilling tool are coaxially sleeved in sequence;

2. The thread-fit multi-power position guide composite drilling tool according to claim 1, wherein the middle power drilling tool is provided with drill teeth below a core tube of a drilling tool body, and the inner side of each drill tooth is provided with an internal thread structure matched with the external thread structure.

3. The thread-fit type multi-power position guide composite drilling tool as claimed in claim 2, wherein the number of the drill teeth is one or more, and the drill teeth are distributed at equal intervals.

4. The thread fit multi-power position guide composite drilling tool according to any one of claims 1 to 3, wherein the position guide linkage drilling tool comprises: the outer sleeve drilling tool and the first guide linkage device are guide linkage rods;

the peripheral surface of the first guide linkage device-guide linkage rod is provided with a guide post; the outer sleeve drilling tool is sleeved on the middle power drilling tool; the outer sleeve drilling tool adopts a soil squeezing and discharging composite drilling tool main body which mainly squeezes soil/adopts a drilling tool main body with a soil discharging function; and a casing is arranged on the outer sleeve drilling tool, and the outer sleeve drilling tool is horizontally fixed with the drilling tower through slips on the casing to keep the perpendicularity of the outer sleeve drilling tool.

5. The thread-fitting multi-power-lead composite drill according to any one of claims 1-3, wherein the medium power drill comprises: the middle power head, the middle sleeve drilling tool and the middle lifting device;

the middle power head is arranged at the upper end of the middle sleeve drilling tool and is used for driving the middle sleeve drilling tool to rotate; the middle sleeve drilling tool is sleeved on the upper power drilling tool; the middle lifting device is arranged at the lower end of the middle power head and used for driving the guide linkage drilling tool to perform lifting action; the guide linkage device comprises a second linkage device-guide linkage groove arranged on the middle sleeve drilling tool, and a guide groove and a guide ridge surface are arranged at the upper part of the second linkage device-guide linkage groove; when the guide ridge surface is contacted with the guide posts on the guide linkage rod, the guide posts can be arranged along the guide ridge surface to rotate to enter the guide groove inlet and move up to the horn mouth of the guide groove passively, so that the guide linkage rod accurately enters the guide linkage groove to complete the linkage device and lock, the middle sleeve drilling tool adopts a soil extrusion and dumping composite drilling tool main body mainly used for extruding soil, and the inner side of the middle sleeve drilling tool core pipe is provided with an internal thread structure.

6. The thread-fitting multi-power lead composite drill according to claim 1, wherein the upper power drill comprises: the device comprises an upper power head, a central drilling tool and an upper lifting device; the upper power head is arranged at the upper end of the central drilling tool and is used for driving the central drilling tool to rotate; the upper lifting device is arranged at the lower end of the upper power head and used for driving the middle power drilling tool to lift; and an external thread structure is arranged on the outer side of the middle core rod of the central drilling tool and used as a helical blade of the upper power drilling tool.

7. The thread-fitting multi-power lead composite drill according to claim 6, wherein the upper power drill further comprises: an upper limiting device; the upper limiting device is arranged at the lower end of the upper power head.

8. A profile pile prepared by a thread-fit type multi-power guide composite drilling tool according to any one of claims 1 to 7, which comprises: a main body pile body;

the lower pile body of the main pile body is provided with a thread structure;