CN111119756A - Drilling tool, pile forming device and pile forming method of soil squeezing pile - Google Patents

Abstract

The invention provides a drilling tool, a pile forming device and a pile forming method of a soil compaction pile, and relates to the technical field of building construction. The drilling tool comprises a cylindrical drill rod, wherein a forward helical blade and a reverse helical blade are respectively arranged on two sections on the drill rod along the length direction of the drill rod. The forward helical blade and the reverse helical blade are both wound on the outer peripheral wall of the drill rod and both extend along the length direction of the drill rod. The pile forming device comprises a concrete conveying mechanism, a first driving mechanism, a second driving mechanism and the drilling tool. The concrete conveying mechanism is communicated with the drill rod through a pipeline, and the first driving mechanism and the second driving mechanism are connected with the drill rod. The pile-forming method of the soil-squeezing pile applies the drilling tool or the pile-forming device. The invention relieves the technical problems that the rotating direction of the helical blade arranged on the rod body of the drill rod in the drilling tool for constructing the soil-squeezing pile in the prior art is only convenient for the drill rod to drill into the ground, and when the drill rod is lifted, the rotating direction of the helical blade is not convenient for the drill rod to be rotated upwards and pulled out.

Description

Drilling tool, pile forming device and pile forming method of soil squeezing pile

Technical Field

The invention relates to the technical field of building construction, in particular to a drilling tool, a pile forming device and a pile forming method of a soil compaction pile.

Background

Compared with soil-sampling piles (such as rotary excavation piles, cast-in-place bored piles, punched piles and the like), the soil-squeezing piles have good advantages in the aspects of controlling settlement and improving bearing capacity, and also have the advantages of high strength, short construction period, no soil sampling, wide application range and the like, so that the soil-squeezing piles are more and more widely applied to the field of building construction.

The pile forming process of the soil compaction pile needs to adopt a special drilling tool, the drilling tool comprises a drill bit and a hollow drill rod, and the drill bit comprises a door opening structure and a hollow core pipe. Helical blades are arranged on the side wall of the drill rod and the side wall of the core pipe, the core pipe is arranged at the bottom end of the drill rod and communicated with the drill rod, one side of the door opening structure is hinged with one side of the core pipe, and the other side of the door opening structure is separated from the other side of the core pipe. When the soil-extruding pile is constructed by using the drilling tool, the drilling tool is started firstly, so that a drill bit of the drilling tool rotates and drives the drill rod to drill into the ground together, and the rotating spiral blade on the drill rod can provide thrust for the drilling process of the drill rod. When the door opening structure reaches the designed depth of the pile, the concrete is introduced into the drill rod, then the drilling tool is lifted upwards and rotated, and the spiral blades on the rotating drill rod can provide thrust for the lifting process of the drill rod. After the drilling tool is lifted, the discharge port is opened by the door opening structure, and the concrete falls into the space left by the lifted drilling tool. After the drilling tool is completely lifted out of the ground, the space drilled by the drilling tool can be filled with concrete, and the soil-extruding pile can be formed after the concrete is solidified and formed.

The drill rod of the existing drilling tool for constructing the extruded soil pile is generally cylindrical, and a spiral blade extending along the length direction of the rod body is arranged on the rod body of the drill rod, but the spiral blade is only convenient for the drill rod to drill into the ground, and when the drill rod is lifted, the spiral blade is inconvenient for the drill rod to be pulled upwards.

In order to facilitate the pulling out of the drill rod when the drill rod is lifted upwards, the existing drill rod is in a shape of a cylinder at the upper part and a half football-shaped at the lower part, but the lower part of the drill rod is in a half football-shaped shape, so that enough supporting force cannot be provided for the process of rotary digging a soil body by a helical blade, the drill rod cannot conveniently drill into the ground, and the drilling process is difficult.

Disclosure of Invention

The invention aims to provide a drilling tool, a pile forming device and a pile forming method for a soil compaction pile, which aim to relieve the technical problems that a drill rod in the drilling tool for constructing the soil compaction pile in the prior art is provided with a spiral blade extending along the length direction of a rod body, but the rotation direction of the spiral blade is only convenient for the drill rod to drill into the ground, and when the drill rod is lifted, the rotation direction of the spiral blade is inconvenient for the drill rod to be pulled upwards.

The drilling tool provided by the invention comprises a cylindrical drill rod, wherein the drill rod comprises a front end and a rear end;

the two sections on the drill rod are respectively provided with a forward helical blade and a reverse helical blade along the length direction of the drill rod, the forward helical blade is arranged on one side close to the front end of the drill rod, and the reverse helical blade is arranged between the forward helical blade and the rear end of the drill rod;

the forward helical blade and the reverse helical blade are both wound on the outer peripheral wall of the drill rod and extend along the length direction of the drill rod, and the rotating direction of the forward helical blade is opposite to that of the reverse helical blade.

Further, the drilling rod is including the first body of rod and the second body of rod that connect gradually, and forward helical blade and reverse helical blade all set up on the first body of rod.

Further, the straight distance between one end of the forward helical blade and the other end of the forward helical blade is smaller than or larger than the straight distance between one end of the reverse helical blade and the other end of the reverse helical blade.

Furthermore, one side of the reverse helical blade, which is far away from the forward helical blade, is connected with a drilled helical blade, and the rotating direction of the drilled helical blade is the same as that of the reverse helical blade;

the drilling helical blade extends along the length direction of the drill rod and surrounds the peripheral wall of the drill rod, and the outer diameter of each layer of the drilling helical blade is linearly reduced from one end of the drilling helical blade close to the reverse helical blade to the other end of the drilling helical blade.

Further, the drilling tool also comprises a cylindrical drill pipe, wherein one end of the drill pipe is communicated with one end of the drill rod;

the body of the drill pipe is provided with a precession spiral blade, and the precession spiral blade extends along the length direction of the drill pipe and surrounds the peripheral wall of the drill pipe.

Furthermore, the forward helical blade, the reverse helical blade and the precession helical blade are all equal-diameter helical blades, and the outer diameter of the forward helical blade is equal to that of the reverse helical blade;

the outer diameter of the precession spiral blade is not greater than the outer diameter of the forward spiral blade.

Furthermore, the forward helical blade, the reverse helical blade and the precession helical blade are all equal-diameter helical blades, and the outer diameter of the forward helical blade is equal to that of the reverse helical blade;

the outer diameter of the precession spiral blade is larger than that of the forward spiral blade.

Further, the drilling tool also comprises a conical door opening structure, and one side of the door opening structure, which is far away from the side of the tip, is hinged with one side of the drilling pipe, which is far away from the side of the drilling rod.

The pile forming device provided by the invention comprises a concrete conveying mechanism, a first driving mechanism, a second driving mechanism and a drilling tool in any one of the technical schemes;

the concrete conveying mechanism is communicated with a drill rod in the drilling tool through a pipeline;

the first driving mechanism and the second driving mechanism are connected with the drill rod, the first driving mechanism is used for driving the drill rod to rotate, and the second driving mechanism is used for driving the drill rod to be close to or far away from the ground.

The invention provides a pile-forming construction method of a soil-squeezing pile, which applies the drilling tool or the pile-forming device in any one of the technical schemes, and the pile-forming construction method of the soil-squeezing pile comprises the following steps:

drilling: driving the drill rod to rotate and pressing the drill rod into the ground;

lifting the drill: and after the drill rod is moved to the designed depth, the drill rod is driven to rotate and is lifted upwards.

The drilling tool, the pile forming device and the pile forming method of the soil compaction pile provided by the invention can have the following beneficial effects:

the drilling tool provided by the invention comprises a cylindrical drilling rod, and a forward helical blade and a reverse helical blade are respectively arranged on two sections on the drilling rod along the length direction of the drilling rod. When the drill rod drills underground, namely the drill rod is driven to drill underground, the drill rod can rotate and is pushed to move towards the underground by external force, the front end of the drill rod is close to the ground, the forward spiral blade is close to the ground, and the forward spiral blade can drill underground before the reverse spiral blade. When the drill rod is drilled into the ground to a certain depth, the self-rotating forward helical blade and the soil body are extruded to form a soil body thread, the soil body thread forms a gripping force on the drill rod, a self-tapping phenomenon is generated, and the effect of driving the drill rod to drill into the ground can be achieved. Because forward helical blade creeps into the underground before reverse helical blade to and the drilling rod still can receive the promotion of external force, therefore under the dual function of the forward helical blade of rotation and external force, the resistance of the reverse helical blade who keeps away from ground can be ignored, and forward helical blade can play the pushing action to the process of drilling down.

When the drill rod is lifted up, namely the drill rod is lifted up from the ground, the drill rod can rotate in the same direction as that of the drill rod during the downward drilling, the drill rod is lifted up by using external force, at the moment, the reverse helical blade can rotationally dig the soil body on the peripheral side of the drill rod before the forward helical blade under the action of the external force, and the reverse helical blade has the opposite rotation direction to that of the forward helical blade, so that the reverse helical blade can lift and push the lifting process of the drill rod during the lifting up. And because the reverse helical blade can dig the soil body around the drill rod in advance than the forward helical blade, and the drill rod is subjected to the lifting action of external force, the resistance of the forward helical blade positioned below the reverse helical blade can be ignored. Under the dual action of the autorotation reverse helical blade and the external force, the reverse helical blade can play a role in pushing the drill lifting process.

Compared with the prior art, the drilling tool provided by the invention can not only utilize the forward helical blade on the rod body of the drilling rod to play a role in pushing the drilling process of the drilling rod into the ground, but also utilize the reverse helical blade on the rod body of the drilling rod to play a role in pushing the drilling process of the drilling rod from the ground, so that the drilling tool provided by the invention is convenient for both drilling and lifting.

In addition, the drill rod provided by the invention is cylindrical, and compared with the existing semi-elliptical drill rod, the drill rod provided by the invention can provide enough supporting force for the forward helical blade in the drilling process, so that the drill rod can conveniently drill into the ground, and the drilling process cannot be hindered.

The pile forming device provided by the invention comprises a concrete conveying mechanism, a first driving mechanism, a second driving mechanism and a drilling tool in any one of the technical schemes. The concrete conveying mechanism is communicated with a drill rod in the drilling tool through a pipeline. The first driving mechanism and the second driving mechanism are connected with the drill rod, the first driving mechanism is used for driving the drill rod to rotate, and the second driving mechanism is used for driving the drill rod to be close to or far away from the ground. The pile forming device provided by the invention comprises the drilling tool, so that the pile forming device has the same beneficial effects as the drilling tool.

The invention provides a pile-forming method of a soil-squeezing pile, which applies the drilling tool or the pile-forming device and comprises the following steps: drilling: driving the drill rod to rotate and pressing the drill rod into the ground; lifting the drill: and after the drill rod is moved to the designed depth, the drill rod is driven to rotate and is lifted upwards. The pile-forming method of the soil-squeezing pile provided by the invention utilizes the drilling tool or the pile-forming device to complete the construction of the soil-squeezing pile, so the pile-forming method of the soil-squeezing pile provided by the invention has the same beneficial effects as the drilling tool and the pile-forming device.

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 description of the embodiments or 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 other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic structural diagram of a drilling tool in which a drill rod according to an embodiment of the present invention includes a first rod and a second rod;

FIG. 2 is a cross-sectional view of the drilling tool of FIG. 1;

FIG. 3 is a schematic structural diagram of a drilling tool according to an embodiment of the present invention;

fig. 4 is another schematic structural diagram of a drilling tool according to an embodiment of the present invention;

FIG. 5 is a schematic view of another structure of a drilling tool according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a drilling tool according to a second embodiment of the present invention;

fig. 7 is another schematic structural diagram of a drilling tool according to a second embodiment of the present invention;

fig. 8 is a schematic view of another structure of a drilling tool according to a second embodiment of the present invention.

Icon: 1-a drill rod; 10-forward helical blades; 11-a reverse helical blade; 12-a first rod; 13-a second rod; 14-drilling out the helical blade; 2-drilling a pipe; 20-precession helical blades; 3-door opening structure.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The first embodiment is as follows:

as shown in fig. 1-5, the present embodiment provides a drilling tool comprising a cylindrical drill rod 1, the drill rod 1 comprising a front end and a rear end. Along the length direction of drilling rod 1, two sections on the drilling rod 1 are provided with forward helical blade 10 and reverse helical blade 11 respectively, and forward helical blade 10 sets up in the one side that is close to the front end of drilling rod 1, and reverse helical blade 11 sets up between the rear end of forward helical blade 10 and drilling rod 1. The forward helical blade 10 and the reverse helical blade 11 both encircle the outer circumferential wall of the drill rod 1 and both extend along the length direction of the drill rod 1, and the rotation direction of the forward helical blade 10 is opposite to that of the reverse helical blade 11.

The forward direction in this embodiment is the direction in which the helical blade is cut into the ground by rotating along with the drill rod 1 when it is rotated into the ground. In this embodiment, when the drill rod 1 is drilled into the ground, the forward end of the drill rod 1 and the forward helical blade 10 are first drilled into the ground and press the soil to form a forward helical soil body, and the reverse helical blade 11 is located behind the forward helical blade 10.

When drilling, that is, when the drill rod 1 is driven to drill into the ground, the drill rod 1 can rotate in the same direction as that of the drilling and the drill rod 1 is driven to move towards the ground by an external force, and at this time, the forward helical blade 10 can drill into the ground before the reverse helical blade 11. When the drill rod 1 is drilled into the ground to a certain depth, the self-rotating forward helical blade 10 and the soil body are extruded to form a soil body thread, the soil body thread forms a bond force on the drill rod 1, a self-tapping phenomenon is generated, and the effect of driving the drill rod 1 to drill into the ground can be achieved. Because the forward helical blade 10 drills underground before the reverse helical blade 11, and the drill rod 1 is pushed by external force, under the dual actions of the self-rotating forward helical blade 10, the constraint force of the helical soil body and the mechanical external force, the resistance of the reverse helical blade 11 far away from the ground is smaller than the drilling force of the drill rod 1, and the forward helical blade 10 can push the downward drilling process.

When the drill is lifted, namely the drill rod 1 is lifted from the ground, the drill rod 1 can rotate and the drill rod 1 is lifted by using an external force, at the moment, under the action of the external force, the reverse helical blade 11 extrudes soil on the peripheral side of the drill rod 1 before the forward helical blade 10, and the soil is extruded into a reverse helical body, and because the rotating direction of the reverse helical blade 11 is opposite to that of the forward helical blade 10, the reverse helical blade 11 can lift and push the lifting process of the drill rod 1 during the lifting of the drill. And because the reverse helical blade 11 rotationally digs the soil body on the peripheral side of the drill rod 1 before the forward helical blade 10, and the drill rod 1 is lifted by an external force, the resistance of the forward helical blade 10 positioned below the reverse helical blade 11 can be ignored. Under the dual action of the rotating reverse helical blade 11 and external force, the reverse helical blade 11 can play a role in pushing the drill lifting process.

Compared with the prior art, the drilling tool that this embodiment provided not only can utilize the positive helical blade 10 on the body of drilling rod 1 to play the pushing action for the process that drilling rod 1 bored into ground, can also utilize the reverse helical blade 11 on the body of drilling rod 1 to play the pushing action for the process that drilling rod 1 drilled out from the underground, therefore the drilling tool that this embodiment provided not only is convenient for to get in the pit also is convenient for carry the brill, and then work efficiency when can promoting the crowded soil stake of construction, and compare in the drilling tool among the prior art and need littleer external force, it is more energy-efficient.

In addition, the drilling rod 1 provided by the embodiment is cylindrical, and compared with the existing semi-elliptical drilling rod 1, the drilling rod 1 provided by the embodiment can provide enough supporting force for the forward helical blade 10 in the drilling process, so that the drilling rod 1 can conveniently drill into the ground, and the drilling process cannot be hindered.

It can be seen that the drilling tool provided by the present embodiment alleviates the technical problem existing in the prior art that the drill rod 1 in the drilling tool for constructing an extruded soil pile is provided with a helical blade extending along the length direction of the rod body, but the helical blade has a rotation direction which is only convenient for the drill rod 1 to drill into the ground, and when the drill rod 1 is lifted, the drill rod 1 cannot be conveniently unscrewed.

The spiral blades arranged on the rod body of the drill rod in the existing drilling tool are unidirectional in rotation direction, and are only suitable for soil layers where soil is easy to disturb. When the soil-extruding pile is constructed in soil layers which are not easy to disturb, such as hard soil layers, clay layers, soil layers containing pebbles, sand layers, water-containing soil layers and the like, the one-way helical blade on the drill rod in the existing drilling tool enables the drill rod to be easy to screw into the soil layers but not easy to screw out from the soil layers in the same direction.

The drill of the present embodiment has the opposite rotation directions of the forward helical blade 10 and the reverse helical blade 11 on the drill rod 1. When the drill rod 1 is rotationally drilled into the soil layer, the forward helical blade 10 drills underground before the reverse helical blade 11, and can drive the reverse helical blade 11 to drill underground. When the drill rod 1 is unscrewed from the earth, the reverse helical blade 11 drills out of the ground before the forward helical blade 10 and can drive the forward helical blade 10 to drill out. Therefore, the drilling tool provided by the embodiment is not only suitable for soil layers with soil bodies being disturbed easily, but also suitable for soil layers with complex geological conditions, and compared with the drilling tool in the prior art, the drilling tool provided by the embodiment has wider applicability.

It should be noted that the soil-squeezing piles are divided into full soil-squeezing piles and half soil-squeezing piles, the full soil-squeezing piles are all completed by drilling tool construction for constructing the soil-squeezing piles, and the half soil-squeezing piles are partial piles completed by drilling tool construction for constructing the soil-squeezing piles. However, no matter the full-extrusion pile or the half-extrusion pile, a drilling tool for constructing the extrusion pile is needed, so that the drilling tool provided by the embodiment can be applied to the construction process of the full-extrusion pile and can also be applied to the construction process of the half-extrusion pile.

As shown in fig. 1 and 2, the forward helical blade 10 and the reverse helical blade 11 may be connected together to form a continuous thread on the drill rod 1.

As shown in fig. 1 and 2, the drill rod 1 includes a first rod 12 and a second rod 13 connected in sequence, and the forward helical blade 10 and the reverse helical blade 11 are both disposed on the first rod 12. When the design length of the pile body of the soil-extruding pile is longer, the drill rod 1 with longer length can be adopted. At this time, the forward helical blade 10 and the reverse helical blade 11 are disposed on the first rod 12 to meet the use requirement, and the drill rod 1 is not required to be fully distributed with the forward helical blade 10 and the reverse helical blade 11, so that in order to save materials, it is preferable in this embodiment that the drill rod 1 has a longer length, the drill rod 1 includes the first rod 12 and the second rod 13 connected in sequence, and the forward helical blade 10 and the reverse helical blade 11 are both disposed on the first rod 12.

Wherein the front end of the drill rod 1 is positioned on the first rod body 12 and the rear end of the drill rod 1 is positioned on the second rod body 13. Further, the shaft surface of the second shaft 13 may be smooth. When the forward helical blade 10 and the reverse helical blade 11 are arranged on the first rod body, the drill rod 1 is the short helical drill rod 1, and the method can be suitable for the condition that the pile body of the soil-extruding pile is designed to be longer in length.

In the present embodiment, as shown in fig. 3, a straight distance from one end of the forward spiral blade 10 to the other end may be equal to a straight distance from one end of the reverse spiral blade 11 to the other end.

As shown in fig. 4, the straight distance from one end of the forward spiral blade 10 to the other end may be smaller than the straight distance from one end of the reverse spiral blade 11 to the other end. As shown in fig. 5, the straight distance from one end of the forward spiral blade 10 to the other end may be larger than the straight distance from one end of the reverse spiral blade 11 to the other end.

As shown in fig. 3 to 5, a straight distance from one end of the reverse spiral blade 11 to the other end is denoted by a, and a straight distance from one end of the forward spiral blade 10 to the other end is denoted by b. In the present embodiment, the relationship between a and b includes the following three types: a ═ b; a < b; a > b.

When a drill rod 1 in the drilling tool extrudes a soil body to a certain depth underground, the drill rod 1 can generate a self-tapping phenomenon under the driving of rotary power and external axial force, at the moment, the drill rod 1 can be driven to face a forward helical blade 10 and a reverse helical blade 11, the helical blade with larger axial distance between two ends moves, and the helical blade with smaller axial distance between two ends is dragged to synchronously move, namely, the drilling tool can utilize the self-tapping principle to enable thrust to overcome resistance, so that the drilling tool is driven to move along a target direction.

Because the geological conditions of a construction site are mostly complex, the soil quality of each layer of soil layer is usually inconsistent, and therefore the geological conditions of the construction site are divided into the following three conditions: firstly, the difficulty of drilling down is consistent with the difficulty of drilling lifting; secondly, the difficulty of drilling down is less than that of drilling up; and thirdly, the difficulty of drilling down is greater than that of drilling up.

Therefore, when the soil-extruding pile is constructed by using the drilling tool provided by the embodiment, the existing drilling tools with two structural forms can be used for testing the soil layer of the construction site to determine which of the three conditions the geological condition of the construction site belongs to.

When the geological conditions of the construction site meet the first condition, the soil-extruding pile can be constructed by using a drilling tool shown in fig. 3, namely a drilling tool with a as b.

When the geological condition of the construction site meets the second condition, the soil-extruding pile constructed by the drilling tool shown in fig. 4 can be selected, namely the soil-extruding pile constructed by the drilling tool with a < b.

When the geological condition of the construction site meets the third condition, the soil-extruding pile constructed by the drilling tool shown in fig. 5 can be selected, namely the soil-extruding pile constructed by the drilling tool with a > b is adopted.

As shown in fig. 1 to 5, a drilling spiral blade 14 is connected to a side of the reverse spiral blade 11 away from the forward spiral blade 10, and the direction of rotation of the drilling spiral blade 14 is the same as the direction of rotation of the reverse spiral blade 11. The drilling screw blade 14 extends along the length of the drill rod 1 and surrounds the outer circumferential wall of the drill rod 1, and the outer diameter of each layer of the drilling screw blade 14 decreases linearly from one end of the drilling screw blade 14 adjacent to the counter screw blade 11 to the other end of the drilling screw blade 14.

The drill out screw blade 14 may be connected to the counter screw blade 11 and form a continuous helical blade.

The helical blade 14 is drilled for drilling prior to the counter-helical blade 11 when lifting the drill. The drill-out screw blade 14 may also provide a driving force for the drill-out process of the drill rod 1 during the drill-up process, further facilitating the drill-out of the drill rod 1 from the ground.

Wherein the drilling screw blade 14 comprises at least two pitches in order to enable the drilling screw blade 14 to provide an effective driving force for the drilling process of the drill rod 1 when lifting the drill.

As shown in fig. 1-5, the drilling tool further comprises a cylindrical drill pipe 2, one of the ends of the drill pipe 2 communicating with one of the ends of the drill rod 1. The body of the drill pipe 2 is provided with a precession spiral blade 20, and the precession spiral blade 20 extends along the length direction of the drill pipe 2 and surrounds the outer circumferential wall of the drill pipe 2.

Wherein, the drill rod 1 is a hollow structure, the drill pipe 2 is a part of the drill bit structure, and the rotating direction of the precession helical blade 20 is the same as that of the forward helical blade 10. The drill pipe 2 and the precessing spiral blade 20 are used to drill into the ground prior to the drill rod 1, and may provide protection to the drill pipe 2.

Further, as shown in fig. 1 to 5, the forward spiral blade 10, the reverse spiral blade 11 and the precession spiral blade 20 are all equal-diameter spiral blades, and the outer diameter of the forward spiral blade 10 is equal to the outer diameter of the reverse spiral blade 11. The outer diameter of the precession screw blade 20 is not greater than that of the forward screw blade 10.

When the outer diameter of the precession helical blade 20 is not larger than the outer diameter of the forward helical blade 10, the rotation directions of the drill rod 1 are kept consistent in the drilling process and the drilling process, and then the soil-extruding pile with the same diameter at each part of the pile body can be constructed.

Wherein, when the drill rod 1 comprises a first rod 12 and a second rod 13, the precession spiral blade 20 is arranged on the first rod 12.

As shown in fig. 1 to 5, the present embodiment preferably has an outer diameter of the precession spiral blade 20 equal to that of the forward spiral blade 10.

Further, as shown in fig. 2, the drilling tool provided by the present embodiment further includes a tapered door opening structure 3, and a side of the door opening structure 3 away from the side of the tip is hinged to a side of the drill pipe 2 away from the side of the drill rod 1.

This structure 3 that opens the door can with the drilling pipe 2 with 1 cooperation construction of drilling rod extrude soil pile, uses the process of the crowded soil pile of drilling tool construction including structure 3, drilling pipe 2 and drilling rod 1 as follows:

the pressurizing power and the rotary driving force are firstly provided for the drilling tool, so that the drilling rod 1 in the drilling tool rotates along the rotation direction of the forward helical blade 10 and pushes the drilling tool towards the ground, at the moment, the conical door opening structure 3 seals the drilling pipe 2 under the reverse pushing action of the ground, the door opening structure 3 and the helical blade 20 on the drilling pipe 2 can drill underground before the drilling rod 1, and then the forward helical blade 10 on the drilling rod 1 can rotatably dig the underground soil layer and bring the drilling rod 1 into the underground. When the door opening structure 3 is pushed to the underground preset depth, the drilling tool is lifted upwards in the same direction, at the moment, the drilling pipe 2 is opened by the door opening structure 3 under the action of gravity, the soil body on the peripheral side of the drilling pipe 1 is loosened by rotary excavation through the reverse helical blades 11 on the drilling pipe 1, and meanwhile, the drilling pipe 1 can be taken out from the underground. And (3) introducing concrete into the drill pipe 2 while lifting the drilling tool, after the drill rod 1 is completely lifted out, the concrete falls into a space reserved after the drill rod 1 is drilled out, placing a reinforcement cage in the concrete which is not initially set, and forming the soil-extruding pile after the concrete is solidified and formed.

Wherein, in the process of lifting the drilling tool and introducing concrete into the drill pipe 2, the drilling tool can be lifted and drilled in a reciprocating manner at a certain depth range, so that the soil body at the depth range is farther than the soil bodies at other positions than the rod body in a manner of being extruded, the diameter of the pile body formed by the concrete at the depth range is larger than that of the pile body formed by the concrete at other positions than the concrete volume, and therefore the pile body of the finally constructed extruded pile is provided with an expanded body capable of improving the holding force between the pile body and the soil body.

In summary, the drilling tool provided by the embodiment can be used for constructing the soil-squeezing pile and the soil-squeezing pile with the enlarged body, so as to improve the bearing capacity of the pile body, and can also be used for facilitating drilling and lifting by utilizing the forward helical blades 10 and the reverse helical blades 11, so that the pushing force or the pulling force applied to the drilling tool can be saved, and the construction efficiency can be improved.

Example two:

as shown in fig. 6 to 8, the drilling tool provided in this embodiment includes a hollow cylindrical drill rod 1, and a forward helical blade 10 and a reverse helical blade 11 are sequentially disposed on a shaft of the drill rod 1 along a length direction of the drill rod 1. The forward helical blade 10 and the reverse helical blade 11 both encircle the outer circumferential wall of the drill rod 1 and both extend along the length direction of the drill rod 1, and the rotation direction of the forward helical blade 10 is opposite to that of the reverse helical blade 11.

As shown in fig. 6 to 8, the remaining features of the drilling tool provided in this embodiment are the same as those of the drilling tool in the first embodiment, and are not described again here. The drilling tool provided by the embodiment is different from the first embodiment in that the forward helical blade 10, the reverse helical blade 11 and the precession helical blade 20 are all equal-diameter helical blades, and the outer diameter of the forward helical blade 10 is equal to that of the reverse helical blade 11. The outer diameter of the precession screw blade 20 is larger than that of the forward screw blade 10.

The outer diameter of the screw-in helical blade 20 is larger than that of the forward helical blade 10, so that a new helical track is formed in the soil body after the drilling tool is lifted, and the pile body of the constructed soil-squeezing pile can be provided with threads.

In addition, in the process of lifting the drilling tool, the rotation direction of the drill rod 1 is changed, and the rotation direction of the threads on the pile body can also be changed, so that two threads with opposite rotation directions are simultaneously arranged on the pile body, or only one type of one-way threads are arranged on the pile body.

Wherein the pitch of the thread on the shaft can be varied by varying the speed of the lifting process of the drilling tool. The lifting speed is high, the screw pitch is large, and the lifting speed is low, the screw pitch is small.

The forward helical blade 10 and the reverse helical blade 11 are sequentially arranged on the drill rod 1 in the drilling tool provided by the embodiment as well as the drill rod 1 in the drilling tool in the first embodiment, so that the drilling tool provided by the embodiment and the drilling tool in the first embodiment can solve the same technical problems and achieve the same technical effects.

Example three:

the pile forming device provided by the embodiment comprises a concrete conveying mechanism, a first driving mechanism, a second driving mechanism and further comprises a drilling tool in the first embodiment or a drilling tool in the second embodiment. The concrete conveying mechanism is communicated with a drill rod in the drilling tool through a pipeline. The first driving mechanism and the second driving mechanism are connected with the drill rod, the first driving mechanism is used for driving the drill rod to rotate, and the second driving mechanism is used for driving the drill rod to be close to or far away from the ground.

The concrete conveying mechanism can be an existing concrete conveying pump machine, the first driving mechanism can be a motor, the second driving mechanism can be a hydraulic cylinder, and the first driving mechanism and the second driving mechanism can also adopt a power system adopted in the existing construction process of the extruded concrete pile.

The pile-forming device provided by the present embodiment includes the drilling tool in the first embodiment or the drilling tool in the second embodiment, so that the pile-forming device provided by the present embodiment and the drilling tool in the first embodiment or the drilling tool in the second embodiment can solve the same technical problems and achieve the same technical effects.

Example four:

the pile-forming method of the soil-squeezing pile provided by the embodiment uses the drilling tool in the embodiment one or the drilling tool in the embodiment two, or uses the pile-forming device in the embodiment three. The pile forming method of the soil compaction pile comprises the following steps:

drilling: driving the drill rod to rotate and pressing the drill rod into the ground;

lifting the drill: and after the drill rod is moved to the designed depth, the drill rod is driven to rotate and is lifted upwards.

When the soil-squeezing pile is constructed, the drill rod can be driven to rotate and be pressed into the ground according to the drilling-down step. The self-rotating drill rod can be rotationally driven into the ground under the action of external pressure and the action of the forward helical blade and the reverse helical blade on the self-rotating drill rod.

And then according to the drill lifting step, after the drill rod moves to the designed depth, the drill rod is driven to rotate and lift up. In the process of lifting the drill rod, the reverse spiral blades rotating on the drill rod can push the drill rod, so that the drill rod lifting process is easier.

In addition, during the process of lifting the drill rod, concrete can be introduced into the drill rod, and the concrete can penetrate through the drill rod and enter a space reserved after the drill rod is lifted. After the drill rods are completely lifted out, concrete falls into a space reserved after the drill rods are drilled out, a reinforcement cage is placed in the concrete which is not initially set, and the soil-extruding pile can be formed after the concrete is set and formed.

In the process of lifting a drilling tool and introducing concrete into a drill pipe, the drilling tool can be lifted and drilled downwards in a reciprocating mode at a certain depth range underground, soil at the depth range can be further extruded than soil at other positions than the rod body, the diameter of a pile body formed by the concrete at the depth range is larger than that of a pile body formed by the concrete at other positions, and therefore the pile body of the finally constructed extruded pile is provided with an expanding body capable of improving the holding force between the pile body and the soil.

The pile-forming method of the soil-extruding pile provided by the embodiment may further include a trial drilling step before the downward drilling step:

trial drilling: and driving the existing drilling tool to drill underground and judging whether the underground soil at the position of the soil-squeezing pile to be constructed is convenient for drilling down, and then driving the existing drilling tool to drill out from the underground and judging whether the underground soil at the position of the soil-squeezing pile to be constructed is convenient for lifting the drill.

The condition of the underground soil at the position of the soil-extruding pile to be constructed can be known through the trial drilling step, so that a drilling tool suitable for the condition of the underground soil can be conveniently selected. If the geological condition of the position of the soil-squeezing pile to be constructed belongs to the condition that the difficulty of drilling down is consistent with the difficulty of drilling up, the linear distance between one end of the forward helical blade and the other end of the forward helical blade can be selected, and the linear distance between one end of the forward helical blade and the other end of the forward helical blade is equal to that of the reverse helical blade. When the geological condition of the position of the soil-squeezing pile to be constructed belongs to the condition that the difficulty of drilling is smaller than the difficulty of drilling, the linear distance between one end of the forward helical blade and the other end of the forward helical blade and the linear distance between one end of the forward helical blade and the other end of the forward helical blade can be selected and used as the drilling tool. When the geological condition of the position of the soil-squeezing pile to be constructed belongs to the condition that the difficulty of drilling is greater than the difficulty of drilling, the linear distance between one end of the forward helical blade and the other end of the forward helical blade and the linear distance between one end of the forward helical blade and the other end of the forward helical blade can be selected and used as a drilling tool.

The pile-forming method of the soil compaction pile provided by the embodiment uses the drilling tool in the first embodiment, the drilling tool in the second embodiment, or the pile-forming device in the third embodiment, so that the pile-forming method provided by the embodiment and the drilling tool in the first embodiment, the drilling tool in the second embodiment, or the pile-forming device in the third embodiment can solve the same technical problems and achieve the same technical effects.

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; while the invention has been described in detail and with reference to the foregoing embodiments, it will 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; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. A drilling tool, comprising a cylindrical drill rod, the drill rod comprising a leading end and a trailing end;

the two sections on the drill rod are respectively provided with a forward helical blade and a reverse helical blade along the length direction of the drill rod, the forward helical blade is arranged on one side close to the front end of the drill rod, and the reverse helical blade is arranged between the forward helical blade and the rear end of the drill rod;

the forward helical blade and the reverse helical blade are both wound on the peripheral wall of the drill rod and extend along the length direction of the drill rod, and the rotation direction of the forward helical blade is opposite to that of the reverse helical blade.

2. The drilling tool as recited in claim 1, wherein the drill rod comprises a first rod and a second rod connected in series, the forward helical blade and the reverse helical blade both being disposed on the first rod.

3. The drilling tool according to claim 1, wherein a linear distance between one of the ends of the forward helical blade and the other end of the forward helical blade is smaller or larger than a linear distance between one of the ends of the reverse helical blade and the other end of the reverse helical blade.

4. The drilling tool according to claim 1, wherein a drilling helical blade is connected to one side of the reverse helical blade far away from the forward helical blade, and the rotation direction of the drilling helical blade is the same as that of the reverse helical blade;

the drilling helical blade extends along the length direction of the drill rod and surrounds the peripheral wall of the drill rod, and the outer diameter of each layer of the drilling helical blade is linearly reduced from one end of the drilling helical blade close to the reverse helical blade to the other end of the drilling helical blade.

5. The drilling tool according to any one of claims 1-4, further comprising a cylindrical drill pipe, one of the ends of which communicates with one of the ends of the drill rod;

the drilling device is characterized in that a precession spiral blade is arranged on the pipe body of the drilling pipe, and the precession spiral blade extends along the length direction of the drilling pipe and surrounds the peripheral wall of the drilling pipe.

6. The drilling tool according to claim 5, wherein the forward helical blade, the reverse helical blade and the precession helical blade are all constant diameter helical blades, and the outer diameter of the forward helical blade and the outer diameter of the reverse helical blade are equal;

the outer diameter of the precession spiral blade is not greater than the outer diameter of the forward spiral blade.

7. The drilling tool according to claim 5, wherein the forward helical blade, the reverse helical blade and the precession helical blade are all constant diameter helical blades, and the outer diameter of the forward helical blade and the outer diameter of the reverse helical blade are equal;

the outer diameter of the precession spiral blade is larger than that of the forward spiral blade.

8. The drilling tool according to claim 5, further comprising a tapered door opening structure, a side of the door opening structure distal from a side of the tip being hinged to a side of the drill pipe distal from a side of the drill rod.

9. A pile forming apparatus, characterised in that it comprises a concrete delivery mechanism, a first drive mechanism, a second drive mechanism and a drilling tool as claimed in any one of claims 1 to 8;

the concrete conveying mechanism is communicated with a drill rod in the drilling tool through a pipeline;

the first driving mechanism and the second driving mechanism are connected with the drill rod, the first driving mechanism is used for driving the drill rod to rotate, and the second driving mechanism is used for driving the drill rod to be close to or far away from the ground.

10. A pile-forming method for a soil-displacement pile using the drilling tool according to any one of claims 1 to 8 or using the pile-forming apparatus according to claim 9, wherein the pile-forming method for a soil-displacement pile comprises:

drilling: driving the drill rod to rotate and pressing the drill rod into the ground;

lifting the drill: and after the drill rod is moved to the designed depth, the drill rod is driven to rotate and be lifted upwards.

Images