WO2010133135A1

WO2010133135A1 - Rotary drilling rig for cast-in-situ tubular pile and piling method thereof

Info

Publication number: WO2010133135A1
Application number: PCT/CN2010/072482
Authority: WO
Inventors: 李征; 龚晓南; 周建
Original assignee: Li Zheng; Gong xiaonan; Zhou Jian
Priority date: 2009-05-19
Filing date: 2010-05-06
Publication date: 2010-11-25
Also published as: CN101566043A

Abstract

A rotary drilling rig for cast-in-situ tubular pile comprises a first drilling rod (1) and a drilling bucket (6) arranged at the bottom of the first drilling rod. The first drilling rod is tubular; the drilling bucket is annular and includes a concentric inner annular wall (8) and an outer annular wall (7). An annular hole (9) is formed between the inner annular wall (8) and the outer annular wall (7). The first drilling rod is concentric with the inner and outer annular wall. The inside diameter of the first drilling rod is more than or equal to that of the inner annular wall and the outside diameter of the first drilling rod is less than or equal to that of the outer annular wall. A piling method includes the following steps: piling with the rotary drilling rig for cast-in-situ tubular pile; forming an annular hole in the ground; repeating rotary drilling until the depth of the annular hole reaches the predetermined depth; casting concrete into the annular hole; forming the tubular pile finally. A joint comprises an upper end surface for connecting with a power head and a lower end surface for connecting with an assembled rod, and the upper, lower end surface are connected with a frusto-cone. The drilling rig can forms an annular hole through rotary drilling, and has the advantages of high construction speed, large diameter of the construction cylinder, deep construction depth, good economy and high bearing capacity.

Description

Cast-in-place pile rotary drilling rig and pile forming method thereof

The invention relates to a pile working device and a pile forming method, in particular to a large diameter cast-in-place pile pile rotary drilling machine and a pile forming method thereof.

Background technique

At present, the perfusion pile in the foundation engineering is constructed by first pressing the retaining sleeve into the ground, then excavating the soil to form a hole, and then putting it into the core, forming an annular hole between the retaining sleeve and the core. The steel cage is placed in the annular hole, and then the core and the retaining wall sleeve are taken out, so that the concrete tubular pile is formed. This method is large and inconvenient to take the soil, and it takes a lot of engineering time.

Patent ZL98113070.4 discloses a large-diameter cast-in-place ring-forming hollow concrete thin-walled tubular pile and its construction method. The pile is formed by cast-in-place concrete or reinforced concrete at one time. During construction, the pile boots are pre-buried at the pile position, and the inner and outer casings are pressed into the soil layer by the high-frequency vibrating hammer to set the depth (automatic discharge of the soil when the casing is pressed) Body), then fill the concrete into the pile pipe (the annular hole between the inner and outer casings) (if there is a steel cage, first the steel cage), after the filling, vibrate, pull the casing, and pull the pipe during the process The concrete is continuously filled in the pile pipe until the perfusion amount is met.

The technology disclosed in the patent ZL01273182.X relies on the vibration force to drive the annular cavity formed by the inner and outer double-layer steel sleeves into the design depth under the protection of the flap pile boots. After the concrete is poured into the annular cavity, the tube is vibrated and pulled out. Concrete pipe piles are formed in the cavity.

The above two methods have large diameters and good stability, and can fully utilize and exert the role of the soil inside the pile to form a composite foundation, which has outstanding economic benefits in soft soil areas. If the soil quality is good, the friction is large, the pile diameter is large, and the pile wall is thick, the difficulty of the construction method will be greatly increased.

Summary of the invention

In order to solve the technical problems described in the background art, the present invention provides a large diameter cast-in-place tubular pile rotary drilling rig and a pile forming method thereof.

The technical solution of the present invention is:

A cast-in-place pile rotary drilling rig comprising a first drill pipe and a drill pipe disposed at a bottom end of the drill pipe, the special one being: the first drill pipe is tubular; the drill pipe is a ring drill The inner ring wall and the outer ring wall are concentric, and the inner ring wall and the outer ring wall are annular holes; the inner diameter of the first drill pipe is large Or equal to the inner diameter of the inner ring wall, the inner diameter of the first drill pipe is the same as the inner diameter of the inner ring wall; the outer diameter of the first drill pipe is less than or equal to the outer diameter of the outer ring wall The outer diameter of the first drill pipe is the same as the outer diameter of the outer ring wall.

The annular hole is provided with an openable annular bottom plate, and the annular bottom plate is provided with an opening communicating with the annular hole, the opening is provided with cutting teeth; and an end of the annular hole opposite to the annular bottom plate is provided with an annular top plate.

One end of the bottom plate is hinged on the outer ring wall, and the other end is movably connected to the outer ring wall.

The cast-in-place pile drilling rotary drilling machine further includes a second drill rod, the first drive rod is provided with a first transmission key bar on the outer wall of the first drill rod, and the inner wall of the second drill rod is axially disposed along the axial direction a first transmission keyway in which the first transmission key bar slides; the first transmission key bar is embedded in the first transmission keyway.

The cast-in-place pile drilling rotary drilling machine further includes a third drill pipe, and the second drill pipe is provided with a second transmission key bar on the outer wall; the inner wall of the third drill pipe is axially disposed along the axial direction a second transmission keyway in which the second transmission key bar slides; the second transmission key bar is embedded in the second transmission keyway.

The inner wall or the top of the first drill pipe is provided with lifting points for wire rope connection, the hanging points are at least two, and are evenly disposed along the inner wall or the top.

The cast-in-place pile rotary drilling rig further includes a guiding slide rail, a power head disposed on the guiding rail, a hoisting machine vertically slidably coupled to the guiding rail, and guiding the wire rope to the slot of the hoisting machine The hoisting machine includes a motor and a reel, and the motor and the power head are respectively disposed at upper and lower ends of the reel; the power head is provided with a synchronous rotating piece; the same rotating piece Connected to the upper end of the sleeve in the power head, the lower end of the reel is connected by the bearing and the synchronous rotating piece: the diagonal strut is disposed away from the vertical direction, one end of which is fixed on the synchronous rotating piece, and the other end is provided for Guide the pulley of the wire rope.

A cast-in-place pile rotary drilling rig includes a combined drill pipe and a second annular drill rig composed of an inner drill pipe set and an outer drill pipe set disposed outside the inner drill pipe set; the inner drill pipe set and the outer drill The rod group is coaxially arranged; the inner drill rod group is composed of a fourth drill rod and a fifth drill rod in sequence from top to bottom; the outer drill rod group is a sixth drill rod and a first set from bottom to top. a seven-drill pipe; a slewing bearing is disposed between the inner drill pipe set and the outer drill pipe set, the slewing bearing includes an inner ring and an outer ring; and the inner ring of the slewing ring is fixed to the fifth drill pipe of the inner drill pipe set On the outer wall or the corresponding end, the outer ring of the slewing ring is fixed on the inner wall of the sixth drill pipe of the outer drill pipe set or the corresponding end portion; The fourth drill pipe, the fifth drill pipe, the sixth drill pipe and the seventh drill pipe are both annular drill pipes; the second annular drill bucket includes a second inner ring wall and a second outer ring wall, a second annular hole is formed between the second inner ring wall and the second outer ring wall, a second annular top plate is disposed at an upper end of the second annular hole, and a lower end of the second annular hole opposite to the second annular top plate is disposed at a lower end a second annular bottom plate, the second annular bottom plate is provided with a second opening communicating with the second annular hole, the second opening is provided with a second cutting tooth; the inner diameter of the second inner ring wall is small or Equal to the inner diameter of the fourth drill pipe; the outer diameter of the second outer ring wall is greater than or equal to the outer diameter of the seventh drill pipe;

The second annular drill bucket is coupled to the bottom end of the fifth drill pipe or the sixth drill pipe by the second annular top plate.

a third transmission key bar is disposed on the outer wall of the fourth drill pipe in the axial direction, and a third transmission key groove slidable along the third transmission key bar is disposed on the inner wall of the fifth drill pipe; a three transmission key strip is embedded in the third transmission keyway;

a fourth transmission key bar is disposed on the outer wall of the sixth drill pipe in the axial direction, and a fourth transmission key groove slidable along the fourth transmission key bar is disposed on the inner wall of the seventh drill pipe; a fourth drive key strip is embedded in the fourth drive keyway;

A cast-in-place pile rotary drilling rig includes a combined drill pipe and a second annular drill rig composed of an inner drill pipe set and an outer drill pipe set disposed outside the inner drill pipe set; the inner drill pipe set and the outer drill The rod group is coaxially arranged; the inner drill rod group is composed of a fourth drill rod, a fifth drill rod and a ninth drill rod in sequence from top to bottom; the outer drill rod group is arranged from bottom to top in order a sixth drill rod, a seventh drill rod and an eighth drill rod; a slewing bearing is arranged between the inner drill rod set and the outer drill rod set, the slewing bearing comprises an inner ring and an outer ring; the inner ring of the slewing bearing Fixing on the outer wall of the ninth drill pipe of the inner drill pipe set or the corresponding end, the outer ring of the slewing bearing is fixed on the inner wall or the corresponding end of the sixth drill pipe of the outer drill pipe set;

The fourth drill pipe, the fifth drill pipe, the sixth drill pipe, the seventh drill pipe, the eighth drill pipe and the ninth drill pipe are all annular drill pipes;

The second annular drilling bucket includes a second inner ring wall and a second outer ring wall, and a second annular hole is formed between the second inner ring wall and the second outer ring wall, and the upper end of the second annular hole is disposed a second annular top plate, the lower end of the second annular hole opposite to the second annular top plate is provided with an openable second annular bottom plate, and the second annular bottom plate is provided with a second opening communicating with the second annular hole The second opening is provided with a second cutting tooth; the inner diameter of the second inner ring wall is small or equal to the inner diameter of the fourth drill pipe; the second outer ring wall The outer diameter is greater than or equal to the outer diameter of the eighth drill pipe;

The second annular drill bucket is coupled to the bottom end of the ninth drill pipe or the sixth drill pipe by the second annular top plate.

a fifth transmission key bar is disposed on the outer wall of the fifth drill pipe, and an inner wall of the ninth drill pipe is provided with a fifth transmission key groove slidable along the fifth transmission key bar; a drive key strip is embedded in the fifth drive keyway of the ninth drill pipe;

a sixth transmission key bar is disposed on an outer wall of the seventh drill pipe; a sixth transmission key groove slidable along the sixth transmission key bar is disposed on an inner wall of the eighth drill pipe; A sixth drive key strip is embedded in the sixth drive keyway.

The outer wall or the top of the fifth drill pipe or the inner wall or the top of the sixth drill pipe is provided with a wire rope hanging point for connecting the wire rope, the wire rope hanging point is at least two, and along the wall circumference or the top The cast-in-place pile rotary drilling rig further includes a wire rope, a hoist, a guide rail, and a power head disposed on the guide rail for driving the outer drill rod set or the inner drill rod set, the wire rope is wound at one end On the hoist, the other end is attached to the wire rope lifting point.

The outer wall or top of the ninth drill pipe, or the inner wall or top of the sixth drill pipe is provided with a wire rope hanging point for connecting the wire rope, the wire rope hanging point is at least two, and along the wall circumference or the top The cast-in-place pile rotary drilling rig further includes a wire rope, a hoist, a guide rail, and a power head disposed on the guide rail for driving the outer drill rod set or the inner drill rod set, the wire rope is wound at one end On the hoist, the other end is attached to the wire rope lifting point.

A joint is characterized in that: the joint includes an upper end surface for connecting the power head and a lower end surface for connecting the combined drill rod, the upper end surface and the lower end surface are connected by a cone, and the upper end surface is small Or equal to the lower end surface, the upper end surface or the lower end surface is a circular surface or an elliptical surface.

A pile forming method using a cast-in-place pile rotary drilling rig includes the following steps: 1), using the cast-in-place tubular pile rotary drilling rig to dig a pile to form an annular hole in the soil body: the circular drilling bucket is hoisted once, once, and the bottom plate of the bottom of the annular drilling bucket is opened, and the drilling bucket is The soil is poured out, and the rotation is repeated until the depth of the annular hole reaches a predetermined depth, and the rotation of the pile hole is completed;

2), pouring concrete into the annular hole, and finally forming a tubular pile.

In the above step 1), at the place where the core is to be formed, the casing is set to the periphery of the pile bottom to a height of the pile bottom or a certain distance below the elevation of the pile bottom, and the cast-in-place pile is rotated. The drilling rig is rotved into a pile; the outer diameter of the casing is smaller than the inner diameter of the annular drilling hopper of the cast-in-place pile rotary drilling rig.

In the above step 1), an annular tube is disposed adjacent to the outer side wall of the annular hole to be formed at the rotary digging; the inner diameter of the annular tube is larger than the outer diameter of the annular drill, and then the hole is dug into a hole.

In the above step 2), before pouring the concrete into the annular hole, firstly, a steel cage is built into the annular hole, and then the concrete is poured into the steel cage, and the concrete is poured into the steel cage to pull out the casing or The concrete is pulled while the concrete is being poured, and the pile is finally formed.

The cast-in-place pile-boring rotary drilling rig of the invention has the advantages of simple structure, and combined with the easy-to-operate pile-forming method of the invention, the annular hole can be formed by the rotary drilling of the annular drilling bucket, and the construction speed is fast, the diameter of the construction cylinder is large, The construction depth is deep, the degree of mechanization is high, the economy is good, and the bearing capacity is high.

DRAWINGS

1 is a schematic view of a three-section drill pipe assembly provided with a drill hopper according to the present invention;

Figure 2 is a schematic cross-sectional view of a drill pipe of the present invention;

Figure 3 is a schematic view showing the structure of the drill bucket of the present invention;

Figure 4 is a schematic view showing the structure of a vertical hoist according to the present invention;

Figure 5 is a schematic view of the joint of the present invention.

detailed description

Referring to Figure 1, the three drill pipes (the first drill pipe 1, the second drill pipe 2, and the third drill pipe 3) are annular.

2 is a schematic cross-sectional view of the second drill pipe 2. As can be clearly seen from the figure, the first drive keyway 4 is disposed on the inner wall of the second drill pipe 2 in the axial direction, and the outer wall is axially disposed. There is a second transmission key bar 5; since the first drill pipe 1 in Fig. 1 is provided with the innermost layer of the combination drill pipe, in order to fix and facilitate the expansion and contraction of the first drill pipe 1, and at the same time, in order to facilitate the torque generated by the power head, the torque is drilled. Transfer between the rods until finally passed to the drill bucket, where the first transmission is provided on the outer wall of the first drill rod 1 corresponding to the first transmission keyway 4 The key bar, the first drill pipe 1 realizes the connection with the second drill pipe 2 and the telescopic movement thereof through the first transmission keyway 4 and the first transmission key bar [the first transmission key bar can slide along the first transmission keyway 4) And the transmission of torque. Similarly, in order to fix and facilitate the expansion and contraction of the second drill pipe 2, a second transmission key groove is provided on the inner wall of the third drill pipe 3 corresponding to the second transmission key bar 5, and the second drill pipe 2 passes the first The second drive key bar 5 and the second drive keyway enable connection to the third drill pipe 3 and its telescoping (the second drive key bar 5 can slide along the second drive keyway) and the transmission of torque.

The bottom end of the first drill pipe 1 is provided with a drill pipe 6.

Referring to Fig. 3, the drill bucket 6 is an annular drill bucket including a coaxial outer ring wall 7 and an inner ring wall 8, and an annular hole 9 is formed between the outer ring wall 7 and the inner ring wall 8, and the annular hole 9 is used for loading. The earth excavated by the drilling bucket 6 during the rotary cutting; and the inner diameter of the inner ring wall 8 is less than or equal to the inner diameter of the first drill pipe 1, and the outer diameter of the outer ring wall 7 is greater than or equal to the outer diameter of the first drill pipe 1, and The first drill pipe 1 is disposed coaxially with the drill pipe 6.

The bottom of the annular drilling bucket, that is, the annular hole 9 is provided with an openable annular bottom plate 10, and the annular bottom plate 10 is provided with an opening 11 provided with cutting teeth communicating with the annular hole 9, and the opening is set according to actual needs. The soil that meets the rotary digging is timely entered into the cavity surrounded by the inner ring wall 8, the outer ring wall 7, the annular bottom plate 10, and the annular top plate 12.

The end of the annular bottom plate 10 is hinged on the outer wall (inner wall) of the outer ring wall 7, and the other end is movably linked with the outer ring wall 7. This structure facilitates opening the annular bottom plate 10, and is poured out by the inner ring wall 8, the outer ring wall 7 and The annular bottom plate 10 and the soil in the cavity surrounded by the annular top plate 12.

Referring to FIG. 4, the cast-in-place pile excavation of the present invention further includes a guide rail 13 and a power head 16 disposed on the guide rail 13 and a hoist 15 vertically slidably coupled to the guide rail 13 for An oblique strut 20 for guiding the wire rope to the groove section of the hoist 15;

The hoist 15 includes a motor 14, a reel 18, and a reel shaft (17). The motor 14 and the power head 16 are respectively disposed at upper and lower ends of the reel 18: the hoist 15 has one end of the motor and the guide rail 13 Connected, the power head 16 is provided with a synchronous rotating piece 19; the synchronous rotating piece 19 may be a steel plate, and the synchronous rotating piece 19 is fixedly connected to the upper end of the sleeve of the power head 16, and the power head 16 includes a high torque hydraulic motor. , reducer, gear shaft, large ring gear, sleeve and other components. The high-torque hydraulic motor (power unit) is connected to the reducer, and the torque is transmitted to the gear shaft through the reduction gearbox. The gear shaft drives the large ring gear to rotate, and the large ring gear drives the sleeve to rotate; the sleeve that is fixedly connected with the large ring gear (The external spline of the sleeve is driven by the internal spline of the large ring gear.) One end is connected to the drill pipe, and one end is connected to the synchronous rotating piece 19, which is transmitted by the sleeve. The power causes the drill rod and the synchronous rotating piece to rotate 19, and the same rotating piece 19 can rotate at the same angular velocity as the drill pipe. The lower end of the hoisting machine 15 is connected by a bearing 23 and a synchronous rotating piece 19; the diagonal struts 20, 22 are disposed away from the vertical direction, one end of which is fixed to the synchronous rotating piece 19, and the other end is provided with a pulley, and the steel wire 21 is wound around the pulley The number of the diagonal struts 20, 22 is the same as that of the steel wire rope. When there are a plurality of diagonal struts 20, 22, the lengths thereof are different, so that the wire rope connecting the drill pipes is at the same angle. They are wound on different groove sections of the hoisting machine 15, respectively.

The inner wall or the top of the first drill pipe 1 of the present invention is provided with lifting points for wire rope connection, the lifting points are at least two, and are evenly arranged along the inner wall or the top, so as to ensure that the drill pipe is in the process of lifting or lowering Balanced and stabilized. Based on the same concept of the above embodiment of the present invention, the present invention also provides the following two different cast-in-place pile rotary drilling rigs including combined drill pipes:

The cast-in-place tubular pile rotary drilling rig is characterized in that: the cast-in-place pile rotary drilling rig comprises a combined drill pipe consisting of an inner drill pipe set and an outer drill pipe set disposed outside the inner drill pipe set and a first a second annular drill bucket; the inner drill rod set and the outer drill rod set are coaxially disposed; the inner drill rod set is composed of a fourth drill rod and a fifth drill rod from top to bottom; the outer drill rod set a sixth drill pipe and a seventh drill pipe disposed in order from bottom to top; a slewing bearing is disposed between the inner drill pipe set and the outer drill pipe set, the slewing bearing includes an inner ring and an outer ring; The inner ring is fixed on the outer wall of the fifth drill pipe of the inner drill pipe group or the corresponding end portion, and the outer ring of the slewing bearing is fixed on the inner wall of the sixth drill pipe of the outer drill pipe group or the corresponding end portion;

The fourth drill pipe, the fifth drill pipe, the sixth drill pipe and the seventh drill pipe are both annular drill pipes;

The second annular drilling bucket includes a second inner ring wall and a second outer ring wall, and a second annular hole is formed between the second inner ring wall and the second outer ring wall, and the upper end of the second annular hole is disposed a second annular top plate, the lower end of the second annular hole opposite to the second annular top plate is provided with an openable second annular bottom plate, and the second annular bottom plate is provided with a second opening communicating with the second annular hole The second opening is provided with a second cutting tooth; the inner diameter of the second inner ring wall is small or equal to the inner diameter of the fourth drill pipe; the outer diameter of the second outer ring wall is greater than or equal to the outer diameter of the seventh drill pipe Trail

The second annular drill bucket is connected to the bottom end of the fifth drill pipe or the sixth drill pipe through the second annular top plate, and the bottom end of the second annular drill bucket and the fifth drill pipe or the sixth drill pipe It is at least 2 places, and the joint is preferably evenly arranged along the bottom end of the fifth drill pipe or the sixth drill pipe. a third transmission key bar is disposed on the outer wall of the fourth drill pipe in the axial direction, and a third transmission key groove slidable along the third transmission key bar is disposed on the inner wall of the fifth drill pipe; a third transmission key strip is embedded in the third transmission keyway;

Wherein, the outer wall or the top of the fifth drill pipe, or the inner wall or the top of the sixth drill pipe is provided with a wire rope hanging point for connecting the wire rope, the wire rope hanging point is at least two, and along the wall circumference or The top is evenly set to ensure that the drill pipe is balanced during lifting or lowering and remains flat.

The cast-in-place pile rotary drilling rig further includes a wire rope, a hoist, a guide rail and a power head disposed on the guide rail for driving the outer drill rod set or the inner drill rod set, the one end of the rope is wound on the hoist, The other end is connected to the wire rope lifting point. Another cast-in-place pile rotary drilling rig includes a combined drill pipe and a second annular drill rig composed of an inner drill pipe set, an outer drill pipe set disposed outside the inner drill pipe set; the inner drill pipe set and the outer drill pipe set The drill pipe set is coaxially disposed; the inner drill pipe set is composed of a fourth drill pipe, a fifth drill pipe and a ninth drill pipe in sequence from top to bottom; the outer drill pipe group is arranged from bottom to top. a sixth drill rod, a seventh drill rod and an eighth drill rod; wherein the inner drill rod set and the outer drill rod set are provided with a slewing bearing, the slewing bearing comprises an inner ring and an outer ring; The ring is fixed on the outer wall of the ninth drill pipe of the inner drill pipe group or the corresponding end portion, and the outer ring of the slewing bearing is fixed on the inner wall of the sixth drill pipe of the outer drill pipe group or the corresponding end portion;

The second annular drilling bucket includes a second inner ring wall and a second outer ring wall, and a second annular hole is formed between the second inner ring wall and the second outer ring wall, and the upper end of the second annular hole is disposed a second annular top plate, the lower end of the second annular hole opposite to the second annular top plate is provided with an openable second annular bottom plate, and the second annular bottom plate is provided with a second opening communicating with the second annular hole The second opening is provided with a second cutting tooth; the inner diameter of the second inner ring wall is small or equal to the inner diameter of the fourth drill pipe; the outer diameter of the second outer ring wall is greater than or equal to the outer diameter of the eighth drill pipe Trail

The second annular drill bucket passes through the second annular top plate and the bottom of the ninth drill pipe or the sixth drill pipe The end connection, the connection between the second annular drill bucket and the bottom end of the ninth drill pipe or the sixth drill pipe is at least two, and the joint is preferably evenly arranged along the bottom end of the ninth drill pipe or the sixth drill pipe.

Wherein, the outer wall of the fourth drill pipe is axially disposed with a third transmission key bar, and the inner wall of the fifth drill pipe is axially disposed with a third transmission key groove slidable along the third transmission key bar; The third transmission key strip is embedded in the third transmission keyway;

Wherein, the outer wall or the top of the ninth drill pipe, or the inner wall or the top of the sixth drill pipe is provided with a wire rope hanging point for connecting the wire rope, the wire rope hanging point is at least two, and along the wall circumference or The top is evenly set to ensure that the drill pipe is balanced during lifting or lowering and remains flat.

The cast-in-place pile rotary drilling rig further includes a wire rope, a hoist, a guide rail and a power head disposed on the guide rail for driving the outer drill rod set or the inner drill rod set, the one end of the rope is wound on the hoist The other end is connected to the wire rope lifting point. In the above two different cast-in-place pile-boring rotary drilling rigs with combined drill pipe, either the inner drill pipe group is driven by the power head to be dug into an annular hole, or the outer drill pipe group is driven by the power head. Rotating into an annular hole, the inner and outer drill pipe sets cannot be dug at the same time; correspondingly, the second annular drill pipe is only connected with the drill pipe group driven by the power head, and then is dug into a hole.

When the inner drill pipe group is dug into a hole, the hoist is connected by the innermost drill pipe of the wire rope and the outer drill pipe group, such as the inner wall of the sixth drill pipe, and the innermost drill pipe of the outer drill pipe group is further slewingly supported. It is connected to the outermost drill pipe of the inner drill pipe group, such as the outer wall of the fifth drill pipe or the ninth drill pipe.

When the outer drill rod group is dug into a hole, the winch passes through the outermost drill pipe of the wire rope and the inner drill rod set. If the outer wall of the fifth drill pipe or the ninth drill pipe is connected, the outermost drill pipe of the inner drill pipe group is connected through the outermost drill pipe of the slewing bearing and the outer drill pipe group, for example, and the outer wall of the sixth drill pipe. connection.

It can be seen that the function of the slewing bearing is to prevent the wire rope from being entangled following the rotation of the rotating drill pipe set, and the other drill pipe set is synchronously lifted; the embodiment is connected by slewing and connecting the wire rope with the non-rotating drill pipe set. The way to effectively solve the problem of wire rope winding.

Referring to FIG. 5, based on the above two different cast-in-place pile rotary drilling rigs with combined drill pipes, the present invention provides a method for connecting a power head and a combined drill pipe (only when combined with the inner drill pipe in the combination drill pipe) The joint of the group or the outer drill rod set cannot simultaneously connect the inner drill rod set and the outer drill rod set, the joint includes an upper end surface 24 for connecting the power head and a lower end surface 25 for connecting the combined drill rod, The upper end surface 24 and the lower end surface 25 are connected by a cone 26 which is small or equal to the lower end surface 25, and the upper end surface 24 or the lower end surface 25 is a circular surface or an elliptical surface.

The method for forming a pile by a rotary drilling rig of the cast-in-place pile according to the present invention comprises the following steps:

1), using the cast-in-place tubular pile rotary drilling rig to dig a pile to form an annular hole in the soil body: the circular drilling bucket is hoisted once, once, and the bottom plate of the bottom of the annular drilling bucket is opened, and the drilling bucket is The soil is poured out, and the rotation is repeated until the depth of the annular hole reaches a predetermined depth, and the rotation of the pile hole is completed;

2), pouring concrete into the annular hole, and finally forming a tubular pile.

In the above step 1), the casing can be sleeved at the periphery where the core is to be formed at the periphery of the pile to the elevation of the pile bottom or a certain distance below the elevation of the pile bottom, and the cast-in-place pile can be utilized. Rotary drilling rig to dig into a pile: The outer diameter of the casing is smaller than the inner diameter of the annular drilling bucket of the cast-in-place pile drilling rotary drilling machine.

In the above step 1), the outer side wall of the annular hole to be formed close to the rotary digging may be provided with an annular tube; the inner diameter of the annular tube is larger than the outer diameter of the annular drilling bucket, and then the hole is dug into a hole.

In the above step 2), before pouring concrete into the annular hole, firstly, a steel cage is built into the annular hole, and then concrete is poured into the steel cage, and the concrete is poured into the steel cage to pull out the casing. Or, while pouring concrete, the casing is pulled out, and finally the pile is formed.

Claims

Claim

1 . A cast-in-place pile rotary drilling rig comprising a first drill pipe and a drill pipe disposed at a bottom end of the drill pipe, wherein: the first drill pipe is tubular; the drill pipe is a ring drill The inner ring wall and the outer ring wall are concentric, and the inner ring wall and the outer ring wall are annular holes; the inner diameter of the first drill pipe is greater than or equal to the inner diameter of the inner ring wall, The inner diameter of the first drill pipe is the same as the inner diameter of the inner ring wall; the outer diameter of the first drill pipe is less than or equal to the outer diameter of the outer ring wall, and the outer diameter of the first drill pipe is The outer diameter of the outer ring wall is the same as the center of the circle.

2. The cast-in-place pile drilling rotary drilling machine according to claim 1, wherein: the annular hole is provided with an openable annular bottom plate, and the annular bottom plate is provided with an opening communicating with the annular hole, the opening A cutting tooth is disposed thereon; an annular top plate is disposed at an end of the annular hole opposite to the annular bottom plate.

3. The cast-in-place pile drilling rotary drilling machine according to claim 2, wherein: one end of the bottom plate is hinged on the outer ring wall, and the other end is movably connected to the outer ring wall.

4. The cast-in-place pile rotary drilling rig according to claim 3, wherein: the cast-in-place pile rotary drilling rig further comprises a second drill pipe, and the outer wall of the first drill pipe is axially Provided with a first transmission key bar, the inner wall of the second drill pipe is axially disposed with a first transmission keyway slidable along the first transmission key bar; the first transmission key bar is embedded in the first transmission keyway .

The cast-in-place pile-boring rotary drilling rig according to claim 4, wherein: the cast-in-place pile-boring rotary drilling machine further comprises a third drill pipe, and the outer wall of the second drill pipe is provided with a a second transmission key strip; the second drill rod is axially disposed on the inner wall of the third drill rod with a second transmission keyway slidable along the second transmission key strip; the second transmission key strip is embedded in the second transmission keyway.

The cast-in-place pile drilling rotary drilling machine according to claim 4 or 5, wherein: the inner wall or the top of the first drill pipe is provided with a lifting point for the wire rope connection, and the lifting point is at least two And uniformly disposed along the inner wall or the top.

7. The cast-in-place pile drilling rotary drilling machine according to claim 6, wherein: the cast-in-place pile rotary drilling machine further comprises a guiding slide rail, a power head disposed on the guiding rail, and a vertical sliding a hoist connected to the guide rail, an oblique struts for guiding the wire rope to the groove section of the hoist; the hoist includes a motor and a reel, and the motor and the power head are respectively disposed on the reel The upper and lower ends of the power head are provided with a synchronous rotating piece; the synchronous rotating piece is connected to the upper end of the sleeve in the power head, and the lower end of the rotating drum is connected with the synchronous rotating piece through a bearing; The rod is deviated from the vertical direction One end is fixed on the synchronous rotating piece, and the other end is provided with a pulley for guiding the wire rope.

8. A cast-in-place pile rotary drilling rig, the: the cast-in-place pile rotary drilling rig comprises a combined drill pipe composed of an inner drill pipe set and an outer drill pipe set disposed outside the inner drill pipe set; a second annular drill bucket; the inner drill rod set and the outer drill rod set are coaxially disposed; the inner drill rod set is composed of a fourth drill rod and a fifth drill rod from top to bottom; the outer drill rod a sixth drill rod and a seventh drill rod disposed in sequence from bottom to top; a slewing bearing is disposed between the inner drill rod set and the outer drill rod set, the slewing bearing includes an inner ring and an outer ring; The inner ring of the support is fixed on the outer wall or the corresponding end of the fifth drill pipe of the inner drill pipe set, and the outer ring of the slewing support is fixed on the inner wall of the sixth drill pipe of the outer drill pipe set or the corresponding end; The drill pipe, the fifth drill pipe, the sixth drill pipe and the seventh drill pipe are each an annular drill pipe; the second annular drill bucket includes a second inner ring wall and a second outer ring wall, the second inner ring wall Forming a second annular hole between the second outer ring and the second outer ring, the second annular hole is provided with a second annular top plate, and the second a second annular bottom plate is disposed at a lower end of the second annular hole opposite to the annular top plate, the second annular bottom plate is provided with a second opening communicating with the second annular hole, and the second opening is provided with a second cutting The inner diameter of the second inner ring wall is small or equal to the inner diameter of the fourth drill pipe; the outer diameter of the second outer ring wall is greater than or equal to the outer diameter of the seventh drill pipe; The second annular top plate is coupled to the bottom end of the fifth drill pipe or the sixth drill pipe.

The cast-in-place pile drilling rotary drilling machine according to claim 8, wherein: the fourth drill rod is provided with a third transmission key bar on the outer wall of the fourth drill rod, and the inner wall of the fifth drill rod is along the shaft Providing a third transmission keyway slidable along the third transmission key strip; the third transmission key strip is embedded in the third transmission keyway;

10. A cast-in-place pile rotary drilling rig, characterized in that: the cast-in-place pile rotary drilling rig comprises a combined drill pipe consisting of an inner drill pipe set and an outer drill pipe set disposed outside the inner drill pipe set and a second annular drill bucket; the inner drill rod set and the outer drill rod set are coaxially disposed; the inner drill rod set is composed of a fourth drill rod, a fifth drill rod and a ninth drill rod from top to bottom; The outer drill pipe group is composed of a sixth drill pipe, a seventh drill pipe and an eighth drill pipe which are disposed in order from bottom to top; a slewing bearing is arranged between the inner drill pipe group and the outer drill pipe group, and the rotation The support comprises an inner ring and an outer ring; the inner ring of the slewing ring is fixed on an outer wall or a corresponding end of the ninth drill pipe of the inner drill pipe set, and the outer ring of the slewing ring is fixed on the sixth drill pipe of the outer drill pipe set On the inner wall or corresponding Ends;

The cast-in-place pile drilling rotary drilling machine according to claim 10, wherein: the fourth drill rod is provided with a third transmission key bar on the outer wall of the fourth drill rod, and the inner wall of the fifth drill rod is along the shaft Providing a third transmission keyway slidable along the third transmission key strip; the third transmission key strip is embedded in the third transmission keyway;

The cast-in-place pile drill rotary drilling machine according to claim 8 or 9, wherein: the outer wall or the top of the fifth drill pipe or the inner wall or the top of the sixth drill pipe is provided with a wire rope for connecting a wire rope hanging point, the wire rope hanging point is at least two, and is arranged along the circumference of the wall or the top; the cast-in-place pile drilling rotary drilling machine further comprises a wire rope, a hoist, a guide rail and is disposed at The guide rail The power head for driving the outer drill rod set or the inner drill rod set, the one end of the wire rope is wound on the hoist and the other end is connected to the wire rope hanging point.

The cast-in-place pile drilling rotary drilling machine according to claim 10 or 11, wherein: the outer wall or the top of the ninth drill pipe or the inner wall or the top of the sixth drill pipe is provided with a wire rope for connecting a wire rope hanging point, the wire rope lifting point is at least two, and is disposed along the wall circumference or the top portion; the cast-in-place pile drilling rotary drilling machine further comprises a wire rope, a hoist, a guiding slide rail and is disposed therein A power head on the guide rail for driving the outer drill rod set or the inner drill rod set, the one end of the wire rope is wound on the hoist and the other end is connected to the wire rope hanging point.

A joint characterized in that: the joint includes an upper end surface for connecting the power head and a lower end surface for connecting the combined drill rod, the upper end surface and the lower end surface are connected by a cone, and the upper end surface is small Or equal to the lower end surface, the upper end surface or the lower end surface is a circular surface or an elliptical surface.

15. A pile forming method for a cast-in-place pile drill rotary drilling machine according to claim 1 or 8 or 10, comprising the following steps:

2), pouring concrete into the annular hole, and finally forming a tubular pile.

The pile forming method according to claim 15, wherein in the step 1), the casing is set at a periphery where the core is to be formed at a place where the core is to be formed, to the bottom of the pile bottom or to the lowest level. At a certain distance from the bottom of the pile bottom, the cast-in-place pile drill rotary drilling machine is used to dig the pile; the outer diameter of the sleeve is smaller than the inner diameter of the annular drill bucket of the cast-in-place pile rotary drilling rig.

The pile forming method according to claim 16, wherein: in the step 1), an annular tube is disposed on an outer side wall of the annular hole to be formed adjacent to the rotary digging; the inner diameter of the annular tube is larger than the annular shape The outer diameter of the drill is then drilled into a hole.

The pile forming method according to claim 16 or 17, wherein in the step 2), before the concrete is poured into the annular hole, a reinforcing cage is first built into the annular hole, and then the steel cage is placed. The concrete is poured into the steel cage, and after the concrete is poured into the steel cage, the casing is pulled out or the concrete is poured and the casing is drawn, and finally the tubular pile is formed.