CN115749608A

CN115749608A - Screw drill for MJS construction method

Info

Publication number: CN115749608A
Application number: CN202211511358.1A
Authority: CN
Inventors: 郝朝旭; 朱鸿冰; 郭振宇; 陈明星; 陆杰
Original assignee: China Coal Geology Group Co Ltd
Current assignee: China Coal Geology Group Co Ltd
Priority date: 2022-11-29
Filing date: 2022-11-29
Publication date: 2023-03-07

Abstract

The utility model relates to a screw rod drilling tool for MJS worker method belongs to the field of foundation pile construction, and it includes the drilling rod, cuts native drill bit and spouts the mechanism soon, the drilling rod with cut the coaxial relative rotation of native drill bit, it sends the thick liquid passageway to have seted up in the drilling rod, spout the mechanism soon including spraying the seat, spray and set up the whitewashing hole with sending thick liquid passageway intercommunication on the seat, the radial dimension who cuts native drill bit is greater than the radial dimension of drilling rod, it is located one side of drilling rod to spray the seat, it is located one side and the two fixed connection that the native drill bit deviates from the ground to spray the seat. This application utilizes the spatial relationship of cutting native drill bit, drilling rod and injection seat, makes and cuts the native drill bit and has played the effect of structural protection to the injection seat at the drilling in-process, utilizes the structural principle of screw rod drilling tool simultaneously for jet stream exists as the drive and cuts native drill bit pivoted power.

Description

Screw drill for MJS construction method

Technical Field

The application relates to the field of foundation pile construction, in particular to a screw drill for an MJS construction method.

Background

The high-pressure jet grouting is to drill a hole by using a drilling machine, insert a grouting pipe with a nozzle to a preset position of a soil layer, make slurry become high-pressure jet by using high-pressure equipment, and jet the high-pressure jet from the nozzle to impact and damage the soil body. Part of fine soil material emerges out of the water surface along with the slurry, and the rest soil particles are stirred and mixed with the slurry under the impact force of a jet flow; after the slurry is solidified, a consolidation body is formed in the soil and forms a composite foundation together with the soil between the piles,

the omnibearing high-pressure rotary grouting MJS construction method (Metro Jet System) is based on the original high-pressure Jet grouting method, and adopts a unique porous pipe and a front-end forced grout sucking device to realize the forced grout discharge in a hole and the monitoring of the underground pressure, and controls the underground pressure by adjusting the forced grout discharge amount, so that the deep mud discharge and the underground pressure are reasonably controlled, the underground pressure is stable, the possibility of surface deformation in construction is reduced, the influence on the environment is greatly reduced, and the reduction of the underground pressure further ensures the pile forming diameter.

The utility model discloses a notice number is CN 209742796U's china utility model discloses a double-barrelled high stirring composite pile special drill bit that spouts of unipolar, it includes that center tube and center tube center open some cavitys, and center tube outside cover is equipped with the core pipe, and the core pipe bottom is fixed with the fixed pin base, and has the drill point through fixed pin connection, and the outer wall of core from the bottom up is fixed with helical blade in proper order and spouts the device that stirs, and the helical blade lower extreme left and right sides is fixed with two and cuts native tooth.

With respect to the related art in the above, the inventors consider that there are the following drawbacks: one end of a spraying and stirring rod of the spraying and stirring device is fixedly connected with the core pipe, the other end of the spraying and stirring rod is suspended in the air, and the end parts of the two groups of spraying and stirring rods, which are far away from the core rod, are positioned on the outer sides of the helical blades and the soil cutting teeth; during drilling or boring, hard objects in the earth layer that are not broken by the helical blades or the soil cutting teeth will cause severe structural damage to the gunning rod.

Disclosure of Invention

In order to improve the above problems, the present application provides a screw drill for an MJS method.

The screw drill for the MJS construction method adopts the following technical scheme:

a screw drilling tool for an MJS construction method comprises a drill rod, a soil cutting drill bit and a rotary spraying mechanism, wherein the drill rod and the soil cutting drill bit coaxially and relatively rotate, a slurry feeding channel is formed in the drill rod, the rotary spraying mechanism comprises a spraying seat, a slurry spraying hole communicated with the slurry feeding channel is formed in the spraying seat, the radial size of the soil cutting drill bit is larger than that of the drill rod, the spraying seat is located on one side of the drill rod, and the spraying seat is located on one side, away from the ground bottom, of the soil cutting drill bit and is fixedly connected with the soil cutting drill bit and the ground bottom.

Through adopting above-mentioned technical scheme, at the in-process that the drilling tool creeps into, cut the direct object friction collision with in the soil layer of soil bit, the object that can contact the injection seat is the disintegrating slag that has been cut by the soil bit that cuts, and it can be less to the damage that the injection seat caused.

Preferably, the drilling rod includes base pole and a power section of thick bamboo, send the thick liquid passageway to be located the base pole, the power passageway has still been seted up on the base pole, the coaxial fixed connection of power section of thick bamboo is in one side that the native drill bit was cut to the base pole orientation, the power section of thick bamboo with cut the coaxial rotation of native drill bit and connect, spout the mechanism soon and include power component, power component is located the power section of thick bamboo, the power section of thick bamboo communicates with the power passageway, power component includes power screw rod and torque rod, the one end that the native drill bit was cut to the power screw rod orientation passes through universal joint with the torque rod and is connected, the torque rod with cut the coaxial fixed connection of native drill bit.

Through adopting above-mentioned technical scheme, power component is applied to this drilling tool with the principle of screw rod drilling tool, and rivers produce the impact force so that it produces and drives the pivoted moment of torsion of cutting the soil drill bit to the power screw, and rivers are final accessible whitewashing hole or broken ground spout blowout.

Preferably, the power assembly further comprises an adjusting piston, an adjusting channel is formed in the torque rod, a first adjusting hole is further formed in the torque rod, the adjusting piston is located in the adjusting channel and slides, a water passing channel is formed in the adjusting piston, a first adjusting water channel is formed in the soil cutting drill bit, a soil breaking nozzle is formed in one side, facing the ground bottom, of the soil cutting drill bit, the soil breaking nozzle is communicated with the first adjusting water channel, and the first adjusting water channel is communicated with the water passing channel.

By adopting the technical scheme, the water passage of the adjusting piston can guide water flow in the power cylinder to the soil cutting drill rod and finally spray the water flow out of the soil breaking nozzle to impact soil below the soil cutting drill bit, so that the drilling pressure of the soil cutting drill bit is reduced.

Preferably, the drilling rod still includes a protection section of thick bamboo, the coaxial fixed connection of a protection section of thick bamboo is in the one end of base rod orientation cutting earth bit, a protection section of thick bamboo is located outside the power section of thick bamboo, a protection section of thick bamboo rotates with cutting earth bit to be connected, form the slip casting space between a protection section of thick bamboo and the power section of thick bamboo, the slip casting space simultaneously with the whitewashing hole with send the thick liquid passageway intercommunication.

By adopting the technical scheme, the space formed by the grouting gap is used for allowing concrete slurry to flow through, enter the soil cutting drill bit and finally reach the rotary spraying seat.

Preferably, the torque rod is further provided with a second adjusting hole, the second adjusting hole is communicated with the adjusting channel, the earth cutting drill is provided with a second adjusting water channel, the second adjusting hole, the water passing channel and the second adjusting water channel are communicated, and the second adjusting water channel is communicated with the grout spraying hole; the one end that the regulation piston faced the ground bottom stretches out from soil cutting drill bit, first regulation hole is located the one side that the ground bottom was kept away from to the second regulation hole.

Through adopting above-mentioned technical scheme, when creeping into, the lower extreme of adjusting the piston receives the butt of below soil layer and relative upward movement, makes first regulation hole and water channel intercommunication, and power rivers can break the ground work, and when the drilling tool lifting carries out the in-process of slip casting simultaneously, adjusts the piston and moves down relatively, and second regulation hole and water channel intercommunication, power rivers can be together followed the whitewashing hole blowout with concrete slurry, and power has been assisted for the injection of concrete slurry to power rivers promptly.

Preferably, an adjusting spring is arranged in the adjusting channel, one end of the adjusting spring is abutted against one end, far away from the ground bottom, of the adjusting piston, and the other end of the adjusting spring is abutted against an end arm of the adjusting channel.

By adopting the technical scheme, in the lifting process of the drilling tool, the adjusting piston can be kept at the position where the second adjusting hole is communicated with the water passing channel due to the existence of the adjusting spring.

Preferably, the one end fixedly connected with stopper of adjusting piston orientation ground bottom, during stopper and the butt of eager soil drill bit, first regulation hole and water channel intercommunication, the last fixedly connected with restriction step that just is located the regulation passageway of adjusting piston, when restriction step and the butt of eager soil drill bit, second regulation hole and water channel intercommunication.

By adopting the technical scheme, the limit block and the display block limit the stroke range of the adjusting piston, so that the adjusting piston can continuously conduct self water flow guiding work and keep smooth operation of the power assembly.

Preferably, the orientation of the shotcrete hole is tangential to the drill pipe and the orientation of the shotcrete hole is opposite to the direction of rotation of the earth cutting bit.

Through adopting above-mentioned technical scheme, the orientation of the liquid of follow spouting hole spun is unanimous with the spouting hole, so the in-process of spouting hole spun liquid can produce the reaction thrust effort to the injection seat, provides auxiliary thrust for the rotation of cutting the soil drill bit.

Preferably, the base rod is further provided with a slurry pumping channel, and a port of the slurry pumping channel, which is close to the ground bottom, is located on the side wall of the base rod.

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

1. the injection seat is arranged on one side of the soil cutting drill bit, which is far away from the ground bottom, so that the soil cutting drill bit directly rubs and collides with objects in a soil layer in the drilling process of the drilling tool, the objects which can contact the injection seat are broken slag which is cut by the soil cutting drill bit, and the damage to the injection seat is small;

2. through power component's setting, be applied to this drilling tool with the principle of screw rod drilling tool, rivers produce the impact force so that it produces and drives the earth cutting drill bit pivoted moment of torsion to the power screw rod, and rivers are final accessible whitewashing hole or broken ground spout blowout.

Drawings

Fig. 1 is a schematic view of the overall structure of a screw drill for embodying the MJS construction method in the embodiment of the present application.

Fig. 2 is a schematic structural diagram for embodying the working principle of the jet grouting mechanism in the embodiment of the application.

Fig. 3 is a schematic structural diagram for embodying the operating principle of the power assembly in the embodiment of the present application.

Description of the reference numerals: 1. a drill stem; 11. a base shaft; 111. a slurry pumping channel; 112. a power channel; 113. a slurry feeding channel; 12. a power cylinder; 13. a protective cylinder; 14. grouting gaps; 2. a soil cutting drill bit; 21. a ground breaking nozzle; 22. a first conditioning flume; 23. a second conditioning flume; 3. a rotary spraying mechanism; 31. an ejection seat; 311. a guniting hole; 4. a power assembly; 41. a power screw; 42. a universal coupling; 43. a torque rod; 431. a regulating channel; 432. a first adjustment aperture; 433. a second adjustment aperture; 44. an adjusting piston; 441. a water passage; 442. a limiting block; 443. a limiting step; 444. a transition groove; 45. the spring is adjusted.

Detailed Description

The present application is described in further detail below with reference to figures 1-3.

The embodiment of the application discloses a screw drill used for an MJS construction method, as shown in figures 1 and 2, the screw drill comprises a drill rod 1, a soil cutting drill 2 and a rotary spraying mechanism 3, wherein the drill rod 1 is used for connecting the soil cutting drill 2 and a drilling machine and transmitting concrete slurry to the soil cutting drill 2, and the soil cutting drill 2 is used for cutting a soil layer structure. The soil cutting drill bit 2 is provided with a rotary spraying mechanism 3, and the rotary spraying mechanism 3 is used for driving the soil cutting drill bit 2 to rotate and spraying clear water and concrete slurry into a soil layer.

As shown in fig. 1 and 2, the drill rod 1 comprises a base rod 11, a power cylinder 12 and a protection cylinder 13, wherein the power cylinder 12 and the protection cylinder 13 are both coaxially and fixedly connected to one end of the base rod 11 facing the ground bottom, the power cylinder 12 is positioned in the protection cylinder 13, a grouting gap 14 is formed between the inner wall of the protection cylinder 13 and the outer wall of the power cylinder 12, and the soil cutting drill bit 2 is coaxially and rotatably connected with the power cylinder 12 and the protection cylinder. A slurry feeding channel 113 and a power channel 112 are arranged on the base rod 11 along the length direction of the base rod, the power channel 112 is communicated with the power cylinder 12, and the slurry feeding channel 113 is communicated with the grouting gap 14; in this embodiment, there is only one power passage 112 and two slurry feed passages 113.

As shown in fig. 1 and 2, the radial dimension of the soil cutting drill bit 2 is larger than that of the drill rod 1, the rotary spraying mechanism 3 comprises a spraying seat 31, the spraying seat 31 is fixedly connected to one side of the soil cutting drill bit 2, which is far away from the ground bottom, and the spraying seat 31 is positioned beside the protective cylinder 13. In this embodiment, the number of the injection seats 31 is four, the four injection seats 31 are arranged in an annular array with the protection barrel 13 as a center, the injection seats 31 are provided with slurry injection holes 311, the orientation of the slurry injection holes 311 is tangential to the drill rod 1, and the orientation of the slurry injection holes 311 is opposite to the direction of rotation of the soil cutting drill bit 2. The shotcrete hole 311 is used for jetting water flow or concrete slurry into the soil layer, so that the shotcrete hole is indirectly communicated with the power channel 112 and the slurry feeding channel 113 in the base rod 11, and meanwhile, a channel for indirectly communicating the shotcrete hole 311 with the grouting gap 14 is further formed in the soil cutting drill bit 2.

As shown in fig. 2 and 3, the rotary spraying mechanism 3 includes a power assembly 4, the power assembly 4 is located in the power cylinder 12 and includes a power screw 41 and a torque rod 43, one end of the power screw 41 facing the soil cutting drill bit 2 is connected with the torque rod 43 through a universal coupling 42, the other end is suspended, and one end of the torque rod 43 far away from the power screw 41 is coaxially and fixedly connected with the soil cutting drill bit 2; at this time, the power assembly 4 forms a structure of a screw drill, the power screw 41 is a rotor, the power cylinder 12 is a stator, high-pressure water flows into the power cylinder 12 through the power channel 112 of the base rod 11 to drive the power screw 41 to rotate, and the power screw 41 transmits torque to the soil cutting drill 2 through the universal coupling 42 and the torque rod 43 to rotate. The side of the earth cutting drill bit 2 facing the ground bottom is provided with a ground breaking nozzle 21, the power assembly 4 further comprises a rod-shaped adjusting piston 44, an adjusting channel 431 is coaxially arranged on the torque rod 43, and the adjusting piston 44 slides in the adjusting channel 431 and is used for guiding water flow in the power cylinder 12 to be selectively sprayed out from the ground breaking nozzle 21 or the grout spraying hole 311.

As shown in fig. 2 and 3, a first adjusting hole 432 and a second adjusting hole 433 are formed in the torque rod 43, the first adjusting hole 432 and the second adjusting hole 433 are respectively located at different axial positions on the torque rod 43 and are both provided with a plurality of holes, and the second adjusting hole 433 is located at one side of the first adjusting hole 432, which is located at the second adjusting hole 433 and far away from the ground; four first adjusting water channels 22 and four second adjusting water channels 23 are formed in the soil cutting drill bit 2, the soil breaking nozzle 21 is communicated with the first adjusting water channels 22, and the second adjusting water channels 23 are communicated with the grout spraying holes 311. The adjusting piston 44 is provided with a water passing channel 441, two ports of the water passing channel 441 are both located on the side wall of the adjusting piston 44, when an upper port of the water passing channel 441 aligns with the first adjusting hole 432, a lower port of the water passing channel 441 communicates with the first adjusting water channel 22, and when the upper port of the water passing channel 441 aligns with the second adjusting hole 433, the lower port of the water passing channel 441 communicates with the second adjusting water channel 23.

As shown in fig. 2 and 3, an adjusting spring 45 is arranged in the adjusting channel 431, one end of the adjusting spring 45 is abutted with one end of the adjusting piston 44 far away from the ground, and the other end is abutted with the end wall of the adjusting channel 431; adjusting piston 44 stretches out soil cutting drill bit 2 and fixedly connected with stopper 442 towards the one end of the ground end, and adjusting piston 44 is gone up and coaxial integrated into one piece has restriction step 443 in adjusting passageway 431 simultaneously, and when stopper 442 and soil cutting drill bit 2 butt, first regulation hole 432 and water passing channel 441 communicate, and when restriction step 443 and soil cutting drill bit 2 butt, second regulation hole 433 and water passing channel 441 communicate. In a natural state, the adjusting spring 45 applies a pushing force to the adjusting piston 44 toward the ground bottom, so that the limiting step 443 abuts against the soil cutting bit 2, that is, at this time, the power cylinder 12 flows into the second adjusting water passage 23 through the second adjusting hole 433 and the water passage 441, and is finally ejected from the grout spraying hole 311. In the process that the drilling tool drills to the ground bottom, soil below the soil cutting drill bit 2 abuts against the limiting block 442, so that thrust is applied to the limiting block 442 to enable the adjusting piston 44 to move upwards relatively, the upper end opening of the water passing channel 441 is aligned with the first adjusting hole 432, high-pressure water flow in the power cylinder 12 flows into the first adjusting water channel 22 from the first adjusting hole 432 and the water passing channel 441 and is finally sprayed out from the soil breaking nozzle 21 to impact the soil below the soil cutting drill bit 2, and the drilling efficiency of the soil cutting drill bit 2 is improved.

As shown in fig. 2 and 3, the side wall of the adjusting piston 44 and the two ports of the water passing channel 441 are both provided with annular transition grooves 444, and the width of the transition grooves 444 is greater than the shortest distance between the first adjusting hole 432 and the second adjusting hole 433; therefore, the adjusting piston 44 can always supply water flow in the power cylinder 12 to the water flow channel 441 in the moving stroke range of the adjusting piston, so that the water flow for supplying power to the power assembly 4 can be kept flowing.

As shown in fig. 1 and 2, a slurry pumping channel 111 for pumping silt out of the borehole is further formed on the base rod 11, and a port of the slurry pumping channel 111 close to the ground bottom is located on the side wall of the base rod 11 and close to the protective cylinder 13. During drilling, air flow is continuously introduced into the slurry feeding channel 113, high-pressure water flow is continuously introduced into the power channel 112, and slurry mixture generated in the drill hole is pumped out of the hole through the slurry pumping channel 111. During grouting, the drilling tool is continuously lifted, concrete slurry is introduced into the slurry feeding channel 113, water flow with reduced pressure is introduced into the power channel 112, and the slurry pumping channel 111 still pumps slurry mixture generated in the drill hole out of the hole.

The implementation principle of the screw drill used for the MJS construction method is as follows:

the power principle of a screw drill is combined with a traditional MJS drill, water flow serving as a power source during drilling of the drill is finally sprayed out from the slurry spraying hole 311 or the ground breaking nozzle 21 while providing rotary driving force for the soil cutting drill 2, and is used for mixing silt in the hole so as to be convenient for suction and impacting the soil quality of the hole wall or the soil quality below the soil cutting drill 2; when the drilling tool is lifted, the dynamic water flow is sprayed out from the grout spraying holes 311, the dynamic force is lifted for the concrete grout sprayed out from the grout spraying holes 311, and the pile forming width is improved.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. A screw drilling tool for an MJS construction method comprises a drill rod (1), an earth cutting drill bit (2) and a rotary spraying mechanism (3), wherein the drill rod (1) and the earth cutting drill bit (2) coaxially rotate relatively, a slurry feeding channel (113) is formed in the drill rod (1), and the screw drilling tool is characterized in that: spout mechanism (3) including spouting seat (31) soon, spout and offer on seat (31) and send whitewashed hole (311) of thick liquid passageway (113) intercommunication, the radial dimension who cuts native drill bit (2) is greater than the radial dimension of drilling rod (1), spout one side that seat (31) are located drilling rod (1), spout one side and the two fixed connection that seat (31) are located and cut native drill bit (2) and deviate from the ground.

2. The screw drill for the MJS construction method as claimed in claim 1, wherein: drilling rod (1) is including base pole (11) and power section of thick bamboo (12), send thick liquid passageway (113) to be located base pole (11), power passageway (112) have still been seted up on base pole (11), power section of thick bamboo (12) coaxial fixed connection is in one side of base pole (11) orientation cutting native drill bit (2), power section of thick bamboo (12) and cutting native drill bit (2) coaxial rotation are connected, spout mechanism (3) including power component (4) soon, power component (4) are located power section of thick bamboo (12), power section of thick bamboo (12) and power passageway (112) intercommunication, power component (4) are including power screw rod (41) and torque rod (43), power screw rod (41) are connected through universal joint (42) towards the one end of cutting native drill bit (2) and torque rod (43), torque rod (43) and the coaxial fixed connection of cutting native drill bit (2).

3. A screw drill for MJS construction method as claimed in claim 2, wherein: the power assembly (4) further comprises an adjusting piston (44), an adjusting channel (431) is formed in the torque rod (43), a first adjusting hole (432) is further formed in the torque rod (43), the adjusting piston (44) is located in the adjusting channel (431) and slides, a water passing channel (441) is formed in the adjusting piston (44), a first adjusting water channel (22) is formed in the soil cutting drill bit (2), a soil breaking nozzle (21) is formed in one side, facing the ground bottom, of the soil cutting drill bit (2), the soil breaking nozzle (21) is communicated with the first adjusting water channel (22), and the first adjusting water channel (22) is communicated with the water passing channel (441).

4. A screw drill for MJS construction method as claimed in claim 3, wherein: drilling rod (1) still includes a protection section of thick bamboo (13), a protection section of thick bamboo (13) coaxial fixed connection is in base rod (11) towards the one end of cutting native drill bit (2), a protection section of thick bamboo (13) are located outside power tube (12), a protection section of thick bamboo (13) are connected with cutting native drill bit (2) rotation, form slip casting space (14) between a protection section of thick bamboo (13) and power tube (12), slip casting space (14) communicate with whitewashing hole (311) and send thick liquid passageway (113) simultaneously.

5. The screw drill for the MJS construction method as claimed in claim 4, wherein: the torque rod (43) is further provided with a second adjusting hole (433), the second adjusting hole (433) is communicated with the adjusting channel (431), the soil cutting drill bit (2) is provided with a second adjusting water channel (23), the second adjusting hole (433), the water passing channel (441) and the second adjusting water channel (23) are communicated, and the second adjusting water channel (23) is communicated with the guniting hole (311);

one end, facing the ground bottom, of the adjusting piston (44) extends out of the soil cutting drill bit (2), and the first adjusting hole (432) is located on one side, far away from the ground bottom, of the second adjusting hole (433).

6. The screw drill for the MJS construction method as claimed in claim 5, wherein: an adjusting spring (45) is arranged in the adjusting channel (431), one end of the adjusting spring (45) is abutted with one end, far away from the ground bottom, of the adjusting piston (44), and the other end of the adjusting spring is abutted with an end arm of the adjusting channel (431).

7. A screw drill for MJS construction method according to claim 5 or 6, wherein: adjusting piston (44) one end fixedly connected with stopper (442) towards the ground bottom, during stopper (442) and eager native drill bit (2) butt, first regulation hole (432) and water channel (441) intercommunication, adjusting piston (44) and being located regulation passageway (431) interior fixedly connected with and restricting step (443), when restriction step (443) and eager native drill bit (2) butt, second regulation hole (433) and water channel (441) intercommunication.

8. The screw drill for the MJS construction method as claimed in claim 7, wherein: the orientation of the shotcrete hole (311) is tangential to the drill rod (1), and the orientation of the shotcrete hole (311) is opposite to the rotation direction of the soil cutting drill bit (2).

9. The screw drill for the MJS construction method as claimed in claim 8, wherein: the base rod (11) is further provided with a slurry pumping channel (111), and a port of the slurry pumping channel (111) close to the ground bottom is located on the side wall of the base rod (11).