CN115788276A - Rotary excavator and rotary excavation pile construction process - Google Patents

Abstract

This application relates to a construction process of a rotary excavator and a rotary excavation pile, and relates to the technical field of construction machinery in construction engineering. In order to solve the problem that the slag removal cylinder will bring the mud out of the hole when excavating the slag and affect the structural stability of the pile hole The problem includes the power head, drill pipe and drilling tools. The drilling tool includes the slag removal barrel and the bucket door that can be opened and closed at the bottom of the slag removal barrel. The drill pipe is connected to the top plate of the slag removal barrel. A number of slurry discharge holes are opened on the side wall, and a splint is slidingly arranged in the slag removal barrel, and the splint can move toward the axis of the slag removal barrel to squeeze the slag and squeeze out the mud in the slag, and the power head is set on the drill On the rod, and the power head and the drill pipe are slidingly connected, the power head can slide along the length direction of the drill pipe, and the drive assembly that drives the splint to move is installed on the power head. The application has the effect of reducing the loss of mud in the pile hole and improving the stability of the pile hole structure.

Description

A kind of rotary excavator and rotary excavation pile construction technology

technical field

The present application relates to the technical field of construction machinery for construction engineering, in particular to a rotary excavator and a rotary excavation pile construction process.

Background technique

Rotary excavator is also called rotary drilling rig and pile driver. Rotary excavator is a comprehensive drilling rig, which has the characteristics of fast hole forming, less pollution and strong mobility. The rotary excavator performs wet excavation operations with a rotary drill bit in the case of mud protection.

In the process of drilling the mud guard arm, the drilling system of the rotary excavator includes a drill bit and a drill pipe. The drill bit is composed of an auger and a slag removal barrel. Under the action of rotation and gravity, the scraping barrel fills the scraping barrel with soil, and then the drill pipe rises back to the height above the ground. After the rotary main engine rotates at a certain angle, the bottom door of the drill bit is opened to discharge the muck in the scraping barrel. , close the bucket door and turn back to the drilling site, lower the drill pipe, put the drill bit into the hole again for drilling operations, and repeat the hole many times. During the drilling process, it is necessary to transport the mud in the mud pool to the hole and maintain the height of the mud liquid level in the hole. When drilling, the soil around the borehole is disturbed, and the soil around the borehole tends to collapse into the hole under the action of horizontal earth pressure. The mud can make the dregs on the inner wall of the hole form a mud skin, and the mud is semi-fluid and can support the hole wall, thereby reducing the phenomenon of hole collapse.

During the operation of the above-mentioned rotary excavator, during the process of filling the slag barrel, more mud will be loaded into the slag barrel together with the soil, and after the slag barrel moves to one side, along with the slag The mud is discharged into the pile hole together. Although there are several through holes for the outflow of mud on the side wall of the slag removal cylinder, the through holes may be blocked or partially blocked, resulting in part of the mud being taken out of the hole. Replenishment of mud may affect the structural stability of the pile hole, and if the replenishment speed is too slow, it will affect the work efficiency.

Contents of the invention

In order to reduce the loss of mud in the pile hole, thereby improving the stability of the pile hole structure, the application provides a rotary excavator and a construction technology of the rotary excavation pile.

In the first aspect, a rotary excavator provided by the application adopts the following technical solution:

A rotary excavator includes a power head, a drill pipe and a drilling tool. The drill tool includes a slag removal barrel and a bucket door that can be opened and closed at the bottom of the slag removal barrel. The drill rod is connected to the top plate of the slag removal barrel. A drill bit is arranged on the bucket door, and a number of slurry discharge holes are opened on the side wall of the slag removal cylinder.

A splint is slidingly arranged in the slag removal barrel, and the splint can move toward the axis of the slag removal barrel to squeeze the dregs and squeeze out the mud in the dregs. The power head is sleeved on the drill pipe, and The power head is slidably connected with the drill pipe, and the power head can slide along the length direction of the drill pipe, and a driving assembly for driving the splint to move is installed on the power head.

By adopting the above technical scheme, when the slag removal barrel lifts the slag to the pile hole, the drive assembly drives the splint to move, and the splint squeezes the slag in the slag removal barrel to squeeze out the mud in the slag and It flows into the pile hole from the grout discharge hole, reducing the loss rate of the mud in the pile hole, thereby improving the stability of the side wall of the pile hole.

As a preference, several limit rods are pierced on the splint, one end of the limit rod is fixedly connected with the inner wall of the slag removal cylinder, and the splint can slide on the limit rod.

By adopting the above technical scheme, on the one hand, the limit rod supports the splint, which is beneficial for the splint to be placed in the slag removal cylinder; on the other hand, the limit rod guides the movement direction of the splint, reducing the movement of the splint Bias phenomenon occurs.

Preferably, the splint is arc-shaped and can be in contact with the inner wall of the slag removal cylinder, and the side of the splint that is in contact with the inner wall of the slag removal chamber is connected with a number of plungers corresponding to the positions of the slurry discharge holes. The plug moves with the splint to open and close the slurry discharge hole.

By adopting the above-mentioned technical scheme, during the rotary digging process of the slag removal cylinder, the soil will block the slurry discharge hole, so that the mud in the slag removal cylinder is not easy to be discharged into the pile hole. Use a plunger to block the grout hole to reduce the possibility of the grout hole being blocked by slag. When the splint squeezes the muck, the plunger follows the splint and moves with the splint, so that the plunger is pulled out of the grout hole to realize The function of unloading pulp hole.

As a preference, a slide bar is connected to the end of the splint close to the inner side of the top plate of the slag removal tube, and a chute for the slide bar to pass through and slide is opened on the top plate of the slag removal tube. Move in the slot.

By adopting the above technical solution, the driving assembly drives the slide bar to move in the chute, and the slide bar drives the splint in the slag removal barrel to move together with the slide bar, realizing the function of the splint squeezing the muck in the slag removal barrel.

As a preference, one end of the slide rod outside the slag removal cylinder is a slope, the drive assembly includes an abutment rod installed on the power head, one end of the abutment rod is provided with a guide slope, and the abutment rod The inclined-plane end of the guiding slope fits and can abut against the inclined-plane end of the slide bar, and when the sliding bar and the inclined-plane of the guiding touch and the power head and the slag-extracting barrel continue to approach, the sliding bar can move along the chute.

By adopting the above technical scheme, the power head moves up and down on the drill pipe until the guide slope of the abutment rod matches the slope of the slide rod. When the abutment rod continues to move down, the slide rod moves in the download chute under the thrust of the abutment rod. Thereby driving the splint to move in the slag removal cylinder.

Preferably, there are two splints, the moving directions of the sliding rods on the two splints are on the same straight line, and the end side walls of the two sliding rods are connected with the same telescopic rod.

By adopting the above technical scheme, when the two splints run toward each other, the extrusion effect on the dregs is better, and the mud can be filtered out from the dregs as much as possible. The telescopic rod is connected with the two slide rods, thereby fixing the relative positions of the two splints.

Preferably, the slide bar is equipped with a restoration assembly for moving the splint to abut against the inner wall of the slag removal cylinder.

By adopting the above technical solution, when the abutting rod does not exert force on the sliding rod, the restoration component resets the sliding rod and the splint, so that the subsequent rotary excavator can continue to work.

Preferably, the restoration assembly includes a spring sheathed on the telescopic rod, and two ends of the spring are respectively fixedly connected to the side walls of the two sliding rods.

By adopting the above technical solution, when the abutting rod exerts a force on the sliding rod and the splints are close to each other, the spring shrinks. When the active force of the abutment rod to the slide bar is removed, the spring returns to its original state, and the slide bar is reset, and the splint is abutted against the inner side wall of the slag removal cylinder at the same time.

In a second aspect, the application provides a construction technique for rotary excavation piles, comprising the following steps:

S1. Pile positioning, excavation of mud pools and mud trenches;

S2. Bury the casing and put the rotary excavator in place;

S3. Rotary excavator drilling construction, diverting the mud into the hole;

S4. Making a reinforcement cage and lowering the reinforcement cage and the conduit into the hole for pouring underwater concrete;

S5. After the concrete pouring is completed, pull out the casing and backfill the hole;

S6. Excavate the foundation trench, and finally chisel the pile head.

In summary, the present application includes at least one of the following beneficial technical effects:

1. The driving component drives the splint to move, and the splint squeezes the muck in the slag removal barrel, extrudes the mud in the muck, and flows into the pile hole from the grout discharge hole, reducing the loss rate of the mud in the pile hole, thereby Improve the stability of the pile hole side wall;

2. Use a plunger to block the grout hole to reduce the possibility of the grout hole being blocked by muck. When the splint squeezes the muck, then pull the plunger out of the grout hole to realize the unloading of the grout hole. pulp function;

3. When the abutting rod exerts force on the sliding rod and the splints are close to each other, the spring shrinks. When the force of the abutting rod on the sliding rod is removed, the spring returns to its original shape and resets the sliding rod, and at the same time makes the splint and the sliding rod The inner wall of the slag removal cylinder is abutted against.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of a rotary excavator according to the embodiment of the present application;

Fig. 2 is a bottom view of a rotary excavator according to the embodiment of the present application;

Fig. 3 is a schematic diagram of an explosion of a rotary excavator according to an embodiment of the present application;

Fig. 4 is a schematic cross-sectional view of a slag removal cylinder of a rotary excavator according to an embodiment of the present application.

Explanation of Reference Signs: 1. Power head; 11. Drive assembly; 12. Abutment rod; 13. Guide slope; 2. Drill pipe; 3. Drilling tool; Hole; 43, plunger; 44, limit rod; 45, slide bar; 46, chute; 47, telescopic rod; 48, recovery component; 49, limit hole; 5, bucket door; 51, bucket teeth; 52, Gap; 53, hook head; 6, opening and closing rod; 61, limiting plate; 62, restraining plate; 63, torsion spring; 64, first connecting rod; 65, second connecting rod; 66, limiting block; 67 ,The hook.

Detailed ways

The present application will be described in further detail below in conjunction with accompanying drawings 1-4.

The embodiment of the present application discloses a rotary excavator. With reference to Fig. 1 and Fig. 2, comprise power head 1, drilling rod 2 and drilling tool 3, drilling tool 3 comprises cylindrical slag removal barrel 4 and bucket door 5 that is positioned at the bottom of slag removal box 4, and drill bit is installed on the bucket door 5, in In this embodiment, the drill bit is a bucket tooth 51 , and the bucket tooth 51 is distributed on the central axis of the bucket door 5 , and the bucket door 5 on both sides of the bucket tooth 51 is provided with arched notches 52 .

Referring to Figure 1 and Figure 3, the power head 1 is sleeved on the drill pipe 2 and can reciprocate along the length direction of the drill pipe 2, or the drill pipe 2 can reciprocate along its own axis, and when the drill pipe 2 rotates, the power The head 1 can rotate together with the drill rod 2, and one end of the drill rod 2 is fixedly connected with the top plate of the slag removal barrel 4. The above are functions that conventional rotary excavators have, and will not be repeated here. The inner side wall of the slagging barrel 4 is fitted with splints 41, the splints 41 are arc-shaped and the number is two, and the two splints 41 are symmetrically arranged on the inner walls of the slagging barrel 4 on both sides of the slagging barrel 4, and the splints 41 There is a gap between them, and the driving assembly 11 that drives the splint 41 to move away from the inner wall of the slag removal cylinder 4 is installed on the power head 1 . A number of slurry discharge holes 42 are provided on the side wall of the slagging cylinder 4, and a plunger 43 corresponding to the slurry discharge hole 42 is installed on the side of the splint 41 abutting with the slagging cylinder 4, and the plunger 43 can be inserted into the slurry discharge In the hole 42, the discharge hole 42 is closed.

During the drilling process, the plunger 43 seals the slurry discharge hole 42 to reduce the entry of mud into the pile hole, thereby reducing the mud being carried out, and the slag removal cylinder 4 seals the slurry discharge hole 42 when digging. When the slag barrel 4 is lifted up after filling the slag, the driving assembly 11 drives the splint 41 away from the inner sidewall of the slag barrel 4, thereby pulling the plunger 43 out of the slurry discharge hole 42 to facilitate the flow of mud. When the two splints 41 are close to each other, the splint 41 squeezes the dregs in the slag removal barrel 4 to squeeze out the mud in the dregs, and the overflowed mud flows from the arched gap 52 of the bucket door 5 and the slagging barrel 4 sides respectively. The slurry discharge hole 42 on the wall flows out, thus falls into the pile hole again, reducing the loss of mud in the pile hole.

Referring to Fig. 3, a number of limit holes 49 are provided on the splint 41, and a number of limit rods 44 corresponding to the limit holes 49 are fixedly connected to the inner wall of the slag removal cylinder 4, and the limit rods 44 are arranged in the limit holes. 49. The limit rod 44 supports the splint 41 and the splint 41 can move repeatedly on the limit rod 44. The limit rod 44 has a limit and guide effect on the moving direction of the splint 41.

The side of the splint 41 near the top plate of the slag removal barrel 4 is fixedly connected with a slide bar 45 passing through the top wall of the slag removal barrel 4, and each splint 41 is provided with two slide bars 45, which are respectively arranged on the splint 41 near the slag removal. Both ends of the side wall of the top plate of the cylinder 4 and the end of the slide bar 45 away from the splint 41 are provided with inclined surfaces. There is a chute 46 on the top plate of the slag removal barrel 4 for the slide bar 45 to pass through and move. The number of the chute 46 is the same as the number of the limit rod 44, and the length direction of the chute 46 is perpendicular to the axes of the two splints 41 . The drive assembly 11 that drives the splint 41 to move is installed on the power head 1. The drive assembly 11 includes an abutment rod 12 that is fixedly connected to the power head 1 and is perpendicular to the power head 1. One end of the abutment rod 12 away from the power head 1 is provided with The guiding inclined surface 13 , and the guiding inclined surface 13 of the abutting rod 12 fits with the inclined surface of the sliding bar 45 .

When the slagging barrel 4 brings the slag to the top of the pile hole, the power head 1 approaches the slagging barrel 4 along the drill pipe 2, and the guide slope 13 of the abutting rod 12 abuts against the slope of the sliding rod 45, and the power head 1 continues to move downward. Move, the abutment rod 12 pushes the slide bar 45 to move along the length direction of the chute 46, so that the two splints 41 are close to each other, and the muck in the slag removal barrel 4 is squeezed, thereby discharging the mud.

With reference to Fig. 1 and Fig. 3, on two splints 41 similar two sliding rods 45 are installed with restoring assembly 48, between two similar sliding rods 45 on two splints 41 is fixedly connected with telescoping rod 47, restoring assembly 48 It includes a spring sheathed on the telescopic rod 47, and the two ends of the spring are fixedly connected with the side walls of the two sliding rods 45 respectively. When the two splints 41 approached, the abutment rod 12 pushed the slide bar 45 to move, and when the two slide bars 45 approached, the telescopic rod 47 and the spring were squeezed, so that the telescopic rod 47 was shortened, and the spring moved along the length of the telescopic rod 47. Contraction in the same direction reduces the radial bending of the spring.

When the abutting rod 12 is away from the sliding rod 45 until the abutting rod 12 is not in contact with the sliding rod 45, the sliding rod 45 loses the thrust of the abutting rod 12, and the spring returns to its original length, thereby pushing the sliding rod 45 to move, so that the two pieces The splints 41 move backwards until they respectively abut against the inner side walls of the slag removal cylinder 4 .

In other embodiments of the present application, the splints 41 can also be other numbers, for example, four pieces arranged at intervals of 90 degrees around the axis of the slag removal cylinder 4, by adjusting the number and position of the slide bar 45 and the abutment bar 12, and the slope orientation.

Referring to Fig. 2 and Fig. 4, there is a loose leaf connected between the bottom of the slag removal barrel 4 and the bucket door 5, and one end of the bucket door 5 is hinged with the slag removal barrel 4 through a loose leaf. One end vertically passes through the 4 top plates of the slag removal cylinder. The limit plate 61 is connected on the top plate of the slag removal barrel 4, and the limit plate 61 is L-shaped. One side of the limit plate 61 is perpendicular to the top plate of the slag removal barrel 4, and the other side of the limit plate 61 is located directly above the opening and closing rod 6. The closing rod 6 passes through the limit plate 61 at the same time, and a torsion spring 63 is sleeved on the opening and closing rod 6 between the limit plate 61 and the top plate of the slag removal cylinder 4 . The inner wall of the slag removal cylinder 4 is fixedly connected with a restraint plate 62, and one end of the opening and closing rod 6 located in the slag removal cylinder 4 passes through the restraint plate 62 and is connected with a first connecting rod 64 in rotation, and the first connecting rod 64 is far away from the opening and closing rod 6. One end of the second connecting rod 65 is rotatably connected with a second connecting rod 65, and the end of the second connecting rod 65 far away from the first connecting rod 64 is connected with a hook 67. The middle part of the second connecting rod 65 is rotatably connected with a limit block 66, and the limit block 66 is fixedly connected. On the inner wall of the slag removal cylinder 4. The end of the bucket door 5 away from the loose-leaf is connected with a hook head 53 that is engaged with the hook 67, and the side wall of the slag removal tube 4 is provided with a hook groove for the movement of the hook 67.

The power head 1 abuts against the opening and closing rod 6 during the downward movement, and exerts a downward thrust on the opening and closing rod 6, the torsion spring 63 shrinks, and the restriction plate 62 restricts the opening and closing rod 6 to move only in the vertical direction. The opening and closing rod 6 applies pressure to the first connecting rod 64, and the first connecting rod 64 exerts a thrust on the second connecting rod 65, so that the second connecting rod 65 rotates around the stopper 66, so that the hook 67 passes through the hook. Groove and break away from hook 53, thereby bucket door 5 is opened.

The end of the bucket door 5 away from the loose leaf is in a state of falling under the action of gravity. When the power head 1 moves up to disengage from the opening and closing rod 6, the hanging end of the bucket door 5 touches the ground and moves the slag removal cylinder 4 towards the ground. 5. Rotate with the loose leaf as the axis, and the hook head 53 is engaged with the hook 67 to complete the closing of the bucket door 5.

The implementation principle of a rotary excavator in the embodiment of the present application is as follows: when the slag removal barrel 4 is filled with muck from the pile hole and rises above the pile hole, the power head 1 approaches the slag removal barrel 4 along the drill pipe 2, The guide slope 13 of the abutment rod 12 abuts against the slope of the slide rod 45, and the power head 1 continues to move down until the side wall of the abutment rod 12 abuts against the side wall of the slide rod 45, and the abutment rod 12 pushes the slide rod 45 along the slide The slot 46 moves along the length direction, and the telescopic rod 47 and the spring are all compressed. When the slide bar 45 moves in the chute 46, push force is applied to the two splints 41 respectively, so that the two splints 41 move along the lengthwise direction of the corresponding stop bar 44 and approach each other. The soil is squeezed, thereby squeezing the mud out of the muck. When the two clamping plates 41 are approaching, the plunger 43 is separated from the discharge hole 42 to facilitate the discharge of mud from the discharge hole 42 .

Then the slag removal cylinder 4 is transferred to the outside of the pile hole, and the power head 1 continues to move down until the power head 1 abuts against the opening and closing rod 6, and the power head 1 applies a thrust to the opening and closing rod 6, the torsion spring 63 shrinks, and the restraint plate 62 The opening and closing rod 6 is restricted to move only in the vertical direction. The opening and closing rod 6 applies pressure to the first connecting rod 64, and the first connecting rod 64 exerts a thrust on the second connecting rod 65, so that the second connecting rod 65 rotates around the stopper 66, so that the hook 67 passes through the hook. Groove and break away from the hook 53, thereby the bucket door 5 is opened and the slag is discharged from the slag removal cylinder 4.

The power head 1 moves up until it is separated from the opening and closing rod 6, and after the soil is discharged, the hanging end of the bucket door 5 touches the ground and moves the slag removal cylinder 4 towards the ground. The head 53 is engaged with the hook 67 to close the bucket door 5 . The power head 1 continues to move up until the abutting rod 12 is not in contact with the sliding rod 45, the sliding rod 45 loses the thrust of the abutting rod 12, and the spring returns to its original length, thereby pushing the sliding rod 45 to move, so that the two splints 41 face away from each other. Move until abutting against the inner sidewall of the slag removal cylinder 4 respectively.

Squeeze the slag in the slag removal barrel 4 through the splint 41 to squeeze out the mud in the slag, and the overflowed mud flows from the arched gap 52 of the bucket door 5 and the slurry discharge hole 42 on the side wall of the slag removal barrel 4 Outflow, thereby falling into the pile hole, reducing the loss of mud in the pile hole.

The application also discloses a construction technique for rotary excavation piles, comprising the following steps:

S1: Measure and set out the pile position according to the design drawings, use the total station to measure the pile position, and excavate the mud pool and mud ditch at the construction site to connect the mud pool with the pile hole;

S2: Use a rotary excavator to excavate a hole larger than the diameter of the pile hole on the pile site, and bury a casing in the hole. The central axis of the casing is aligned with the measured pile center, and the verticality of the casing is strictly maintained;

S3: The rotary excavator drills the hole, and drains the mud into the pile hole during the hole opening process, stabilizing the soil at the hole hole and protecting the hole wall;

S4: After the excavation of the pile hole is completed, make a reinforcement cage and lift the reinforcement cage into the pile hole through a crane, select a suitable conduit and lift it into the pile hole, and the bottom of the conduit is lowered to about 500mm above the hole bottom level , and install the funnel on the top of the conduit, pour concrete from the funnel, pull out the conduit while pouring the concrete, so that the bottom of the conduit is always in the poured concrete;

S5: After the concrete pouring is completed, before the initial setting of the concrete, pull out the casing from the opening, keep the verticality of the casing when lifting the casing, and reduce the damage to the poured concrete, and then backfill the side wall of the opening ;

S6: Excavate the foundation trench and chisel the pile head manually.

All of the above are preferred embodiments of the application, and are not intended to limit the protection scope of the application. Therefore, all equivalent changes made according to the structure, shape, and principle of the application should be covered by the protection scope of the application. Inside.

All of the above are preferred embodiments of the application, and are not intended to limit the protection scope of the application. Therefore, all equivalent changes made according to the structure, shape, and principle of the application should be covered by the protection scope of the application. Inside.

Claims (9)

1. A rotary drilling machine comprises a power head (1), a drill rod (2) and a drilling tool (3), wherein the drilling tool (3) comprises a slag drawing cylinder (4) and a hopper door (5) which is positioned at the bottom of the slag drawing cylinder (4) and can be opened and closed, the drill rod (2) is connected with a top plate of the slag drawing cylinder (4), a drill bit is arranged on the hopper door (5), a plurality of slurry discharging holes (42) are formed in the side wall of the slag drawing cylinder (4), and the rotary drilling machine is characterized in that,

draw and slide in sediment section of thick bamboo (4) and be provided with splint (41), splint (41) can be towards drawing sediment section of thick bamboo (4) axis direction and remove and be arranged in extruding the dregs and extrude the mud in the dregs, unit head (1) cover is established on drilling rod (2), and unit head (1) and drilling rod (2) sliding connection, and unit head (1) can slide along drilling rod (2) length direction, install drive assembly (11) that order about splint (41) and remove on unit head (1).

2. The rotary excavating machine according to claim 1, characterized in that a plurality of limiting rods (44) are arranged on the clamping plate (41) in a penetrating manner, one end of each limiting rod (44) is fixedly connected with the inner side wall of the slag removing barrel (4), and the clamping plate (41) can slide on the limiting rods (44).

3. The rotary excavating machine according to claim 1, characterized in that the clamping plate (41) is arc-shaped and can be abutted against the inner side wall of the slag removing barrel (4), one surface of the clamping plate (41) abutted against the inner side wall of the slag removing barrel (4) is connected with a plurality of plungers (43) corresponding to the positions of the grout discharging holes (42), and the plungers (43) can open and close the grout discharging holes (42) along with the movement of the clamping plate (41).

4. The rotary excavating machine according to claim 3, characterized in that a slide rod (45) is connected to one end of the clamp plate (41) close to the inner side of the top plate of the excavating cylinder (4), the top plate of the excavating cylinder (4) is provided with a sliding groove (46) for the slide rod (45) to pass through and slide, and the driving assembly (11) is used for driving the slide rod (45) to move in the sliding groove (46).

5. The rotary drilling machine according to claim 4, wherein one end of the sliding rod (45) located outside the slag picking barrel (4) is an inclined surface, the driving assembly (11) comprises a butt rod (12) installed on the power head (1), one end of the butt rod (12) is provided with a guide inclined surface (13), the guide inclined surface (13) of the butt rod (12) is matched with and can abut against the inclined surface end of the sliding rod (45), and when the sliding rod (45) abuts against the guide inclined surface (13) and the power head (1) and the slag picking barrel (4) continue to approach, the sliding rod (45) can move along the sliding groove (46).

6. The rotary excavating machine according to claim 4, characterized in that the number of the clamping plates (41) is two, the moving directions of the sliding rods (45) on the two clamping plates (41) are located on the same straight line, and the side walls of the end parts of the two sliding rods (45) are connected with the same telescopic rod (47).

7. The rotary excavating machine according to claim 6, characterized in that the slide rod (45) is provided with a restoring component (48) which enables the clamping plate (41) to move to abut against the inner side wall of the slag drawing barrel (4).

8. The rotary excavating machine according to claim 7, characterized in that the restoring assembly (48) comprises a spring which is sleeved on the telescopic rod (47), and two ends of the spring are respectively fixedly connected with the side walls of the two sliding rods (45).

9. A construction process of a rotary excavating pile, which uses the rotary excavating machine according to any one of claims 1 to 8, characterized by comprising the following steps:

s1, positioning a pile, and excavating a slurry pool and a slurry ditch;

s2, embedding a pile casing and positioning a rotary digging machine;

s3, drilling construction of the rotary excavating machine, and guiding slurry into a hole;

s4, manufacturing a reinforcement cage, putting the reinforcement cage and the guide pipe into the hole, and pouring pile hole concrete;

s5, after concrete pouring is finished, pulling out the protecting cylinder, and backfilling the hole;

and S6, excavating the foundation trench, and finally chiseling the pile head.

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