Long spiral double-pipe high-pressure stirring jet pile construction device and construction method thereof

Abstract

In a long spiral double-pipe high-pressure stirring jet pile construction device, a water jet nozzle is rotatably arranged on the sidewall of a drill rod, and a same-motion mechanism, an elastic assembly and a detection rod are further arranged in the drill rod; the top of the detection rod is fixedly connected with the same-motion mechanism after penetrating through the elastic assembly; the same-motion mechanism is cooperated with the end of the water jet nozzle away from the water jet nozzle; the bottom of the detection rod is axially penetrated through the drill bit and is in contact with the bottom surface of the pile hole; the water jet nozzle has a first position and a second position; when the water jet nozzle is in the first position, the water jet nozzle falls on the sidewall of the pile hole and is located outside the outer diameter of the stirring blade; when the water jet nozzle is in the second position, the water jet nozzle falls on the bottom surface of the pile hole and is located outside the outer diameter of the drill bit. The water jet nozzle in the design can switch between the expanding state and the rock breaking state according to the hardness of the soil layer during the drilling of the drill bit, which can not only strengthen the expanding effect during the drilling of the rock layer, but also reduce the wear of the stirring blade and improve the service life.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of foundation treatment, and particularly relates to a long-spiral double-pipe high-pressure stirring and jetting pile construction device and a construction method thereof, which is suitable for improving the effect of diameter expansion during rock stratum drilling and reducing the abrasion of stirring blades. BACKGROUND

[0002] According to the process, the ground reinforcement pile is divided into three types: the powder jetting pile, the cement powder is pressed into the soil through the hollow drill rod by compressed air, the soil is cut by the blades on the drill bit to mix the soil and the cement powder into the pile; the stirring pile, the cement slurry is sprayed through the hollow drill rod and the opening at the lower end of the drill bit, the soil is cut by the blades on the drill bit to mix the cement slurry and the soil into the pile; the rotary jetting pile, the high-pressure cement slurry, compressed air and high-pressure water are used as three pipes, or the high-pressure cement slurry and compressed air are used as two pipes, or only the high-pressure cement slurry is used as a single pipe, the soil is cut by the rotary jetting through the lower end of the hollow drill rod to form the pile.

[0003] The application disclosed in Chinese patent CN101962949A proposes a long-spiral double-pipe high-pressure stirring and jetting pile construction method and device, which is composed of a long-spiral drill, a stirring system and a double-pipe high-pressure jetting and stirring system, the long-spiral drill is provided with a variable speed control system, the double-pipe high-pressure jetting and stirring system includes a hollow drill rod, a high-pressure slurry pipe, a high-pressure water pipe, stirring blades, a double-pipe rotary jetting and stirring drill bit, a double-pipe rotary grouting joint, a cement slurry conveying pipe, a high-pressure water conveying pipe, a high-pressure cement grouting pump and a high-pressure water pump, the stirring blades fixed to the side of the drill bit can form the stirring effect on the slurry in the pile hole, and the stirring blades can also pre-expand the pile hole during the submersion of the drill bit to improve the efficiency of the diameter expansion when the high-pressure water impacts the hole wall, but when the drill bit drills into the rock stratum, the drill bit can only break the rock in the region of the outer diameter of the drill bit, at this time, the stirring blades are more likely to directly contact the rock stratum, which can aggravate the abrasion of the stirring blades and reduce the service life of the stirring blades. SUMMARY

[0004] The application aims to provide a long-spiral double-pipe high-pressure stirring and jetting pile construction device and a construction method thereof, which can improve the effect of diameter expansion during rock stratum drilling and reduce the abrasion of stirring blades.

[0005] To achieve the above-mentioned purposes, the technical scheme of the application is as follows:

[0006] The long spiral double-tube high-pressure stirring jet pile construction device comprises a long spiral drill, a drill rod and a drill bit, the drill rod is a hollow structure, the inside of the drill rod is provided with a high-pressure slurry conveying pipe and a high-pressure water pipe, the side wall of the drill rod is provided with stirring blades, a multi-layer jet mortar nozzle group and a multi-layer jet water nozzle group, the jet mortar nozzle group is composed of a plurality of jet mortar nozzles in communication with the high-pressure slurry conveying pipe, and the jet water nozzle group is composed of a plurality of jet water nozzles in communication with the high-pressure water pipe;

[0007] The jet water nozzle is rotatably arranged on the side wall of the drill rod, the inside of the drill rod is further provided with a same-motion mechanism, an elastic assembly and a detection rod, the top of the detection rod is fixedly connected with the same-motion mechanism after penetrating through the elastic assembly, the same-motion mechanism is matched with the end of the jet water nozzle away from the water jet opening, and the bottom of the detection rod is in contact with the bottom surface of the pile hole after penetrating through the drill bit in an axial direction.

[0008] The jet water nozzle has a first position and a second position, when the jet water nozzle is in the first position, the water flow falling point of the jet water nozzle is on the side wall of the pile hole and located outside the outer diameter of the stirring blades, and when the jet water nozzle is in the second position, the water flow falling point of the jet water nozzle is on the bottom surface of the pile hole and located outside the outer diameter of the drill bit.

[0009] During the drilling of the pile hole by the construction device, the detection rod is compressed by the force from the soil body to move upward, or is moved downward under the elastic force from the compressed elastic assembly.

[0010] The same-motion mechanism drives the jet water nozzle to rotate downward from the first position to the second position when the detection rod moves upward, or drives the jet water nozzle to rotate upward from the second position to the first position when the detection rod moves downward.

[0011] A sliding groove is arranged on the side wall of the detection rod, the sliding groove comprises a straight segment arranged vertically along the side wall of the detection rod and a spiral segment arranged circumferentially, the top of the straight segment is connected with the bottom of the spiral segment, the drill bit is provided with a detection hole along the central axis of the drill bit, and a sliding block sliding along the sliding groove is fixed to the inner wall of the detection hole.

[0012] The included angle between the two ends of the spiral segment is not greater than 45°.

[0013] The end of the jet water nozzle away from the water jet opening is rotatably arranged in the mounting hole arranged on the side wall of the drill rod and fixedly connected with the middle part of the gear arranged in the mounting hole, the same-motion mechanism comprises a first support, the first support is a bucket-shaped structure with an opening facing upward, the bottom middle part of the first support is fixedly connected with the top of the detection rod, a gear rack is arranged on the outer side wall of the first support, and the gear rack is engaged with the gear when the sliding block is located in the spiral segment.

[0014] The end of the jet water nozzle away from the water jet opening is mounted in the mounting hole through a rotating shaft, and the rotating shaft is in transmission connection with a motor.

[0015] The motor is used to drive the rotation of the rotating shaft, so as to adjust the spray angle of the water jet nozzle in the first position.

[0016] The top of the detection rod penetrates through the through hole in the middle of the bottom end of the first support and extends into the first support, the side wall of the detection rod is fixedly connected with the inner wall of the through hole, a magnetic block is installed on the part of the detection rod extending into the first support, a magnetic control switch is installed in the first support, and the magnetic control switch is connected with the motor in signal mode.

[0017] The magnetic control switch is used to send a power-off signal to the motor when the magnetic control switch is aligned with the magnetic block.

[0018] The water jet nozzle group is located below the jetting nozzle group, the multiple water jet nozzle groups are arranged vertically from top to bottom along the drill rod, the multiple water jet nozzles in the same water jet nozzle group are uniformly arranged around the drill rod, the water streams sprayed by the multiple water jet nozzles in the same vertical row in different water jet nozzle groups intersect at point A, the point A is located on the side wall of the pile hole and outside the outer diameter of the stirring blade, and the water streams sprayed by the multiple water jet nozzles in the same vertical row in different water jet nozzle groups intersect at point B, the point B is located on the bottom surface of the pile hole and outside the outer diameter of the drill bit.

[0019] The same motion mechanism further comprises a second support, the second support is a bucket-shaped structure with an opening facing downward, the bottom of the second support is fixedly connected with the middle part of the top surface of the drill bit, the elastic assembly is located in the second support, and the two ends of the elastic assembly are respectively abutted with the lower surface of the top end of the second support and the top surface of the drill bit, the elastic assembly is a spring, and the bottom of the detection rod penetrates through the top end of the second support, the elastic assembly and the drill bit in sequence and extends out to the outside of the bottom end of the drill bit.

[0020] A protective cover is arranged on the mounting hole, and a movable opening for the rotation of the water jet nozzle is formed in the protective cover.

[0021] A construction method of a long spiral double-pipe high-pressure stirring and jetting pile construction device, the construction method is specifically as follows:

[0022] The drilling rod and drill bit on the construction device are rotated to drill into the center point of the pile hole, a high-pressure water flow is sprayed through the water nozzle, a high-pressure cement slurry is sprayed through the mortar nozzle, until the designed depth of the pile hole is drilled; in the drilling process, when drilling into soft soil layer, the force from the soft soil body is not enough to push the detection rod, at this time, the water nozzle is in the first position, the water flow sprayed by the water nozzle falls on the sidewall of the pile hole and is located outside the outer diameter of the stirring blade, the soil body around the sidewall of the pile hole is cut, and the effect of expanding the diameter is formed, when drilling into hard soil layer, the force from the hard soil body pushes the detection rod to compress the elastic component to move upward, the detection rod moves upward to drive the same-motion mechanism to move upward, the same-motion mechanism moves upward to drive the water nozzle to rotate from the first position to the second position, the water nozzle is in the second position, the water flow sprayed by the water nozzle falls on the bottom surface of the pile hole and is located outside the outer diameter of the drill bit, the soil body at the bottom of the pile hole is cut, and the effect of breaking the rock is formed.

[0023] Compared with the prior art, the beneficial effects of the present application are:

[0024] 1. In the long spiral double pipe high pressure stirring and jetting pile construction device, the water nozzle is rotatably arranged on the sidewall of the drill rod, the drill rod further comprises a same motion mechanism, an elastic assembly and a detection rod, the top of the detection rod is fixedly connected with the same motion mechanism after penetrating through the elastic assembly, the same motion mechanism is matched with the end of the water nozzle away from the water outlet, the bottom of the detection rod is axially penetrated through the drill bit and is in contact with the bottom surface of the pile hole, the water nozzle has a first position and a second position, when the water nozzle is in the first position, the water jet falling point is on the sidewall of the pile hole and is located outside the outer diameter of the stirring blade, when the water nozzle is in the second position, the water jet falling point is on the bottom surface of the pile hole and is located outside the outer diameter of the drill bit; the working principle of the device is that the drill rod and the drill bit on the construction device are rotated and drilled to the center point of the pile hole, high pressure water flow is jetted through the water nozzle and high pressure cement slurry is jetted through the jetting nozzle at the same time, until the designed depth of the pile hole is drilled, during the drilling process, when drilling in soft soil layer such as low weathered rock layer, the force from the soft soil body is not enough to drive the detection rod, at this time, the water nozzle is in the first position, the water jet falling point is on the sidewall of the pile hole and is located outside the outer diameter of the stirring blade, the soil body around the pile hole is cut, which is the diameter expansion state of the water nozzle, the diameter expansion efficiency is improved together with the stirring blade, when drilling in hard soil layer such as rock layer above medium weathering, the force from the hard soil body drives the detection rod to compress the elastic assembly and move upward, the detection rod moves upward to drive the same motion mechanism to move upward, the same motion mechanism moves upward to drive the water nozzle to rotate from the first position to the second position, when the water nozzle is in the second position, the water jet falling point is on the bottom surface of the pile hole and is located outside the outer diameter of the drill bit, the soil body at the bottom of the pile hole is cut, which is the rock breaking state of the water nozzle, the rock breaking of the outer diameter area of the drill bit is carried out, the wear of the stirring blade is reduced, and the service life of the stirring blade is improved, the water nozzle in the design can switch between the diameter expansion state and the rock breaking state according to the hardness of the soil layer during the drilling process of the drill bit, without the need to set a complex detection structure, and is especially suitable for high quality construction of the stirring and jetting pile in some complex strata. Therefore, the present application not only can strengthen the diameter expansion effect during rock layer drilling, but also can reduce the wear of the stirring blade and improve the service life of the stirring blade.

[0025] 2. In the long spiral double pipe high pressure stirring and jetting pile construction device, the end of the water nozzle away from the water outlet is installed in the installation hole through the rotating shaft, and the rotating shaft is drivingly connected with the motor; during the construction process of the stirring and jetting pile, the selection of the pile diameter of the pile hole is generally determined according to the stratum soil or design requirements, the rotating shaft is driven to rotate by the motor in the design, the jetting angle of the water nozzle in the first position is adjusted, so as to adjust the diameter expansion value, and the problem of inconvenient adjustment of the jetting angle of the water nozzle is avoided. Therefore, the diameter expansion value of the water nozzle is convenient to adjust.

[0026] 3, In the long spiral double-pipe high-pressure stirring jet pile construction device, the water jet nozzle group is located below the jet nozzle group, the multiple layers of water jet nozzle groups are arranged in sequence from top to bottom along the vertical direction of the drill rod, the multiple water jet nozzles in the same water jet nozzle group are evenly arranged around the drill rod, the water streams sprayed by the multiple water jet nozzles in the same vertical row in different water jet nozzle groups intersect at point A, the point A is located on the side wall of the pile hole and outside the outer diameter of the stirring blade, the water streams sprayed by the multiple water jet nozzles in the same vertical row in different water jet nozzle groups intersect at point B, the point B is located on the bottom surface of the pile hole and outside the outer diameter of the drill bit; the jet streams of the multiple water jet nozzles intersect at one point, so that the kinetic energy loss of the high-pressure water flow in the mud in the pile hole can be reasonably compensated, and the cutting effect of the high-pressure water flow on the soil body is effectively ensured. Therefore, the cutting effect of the high-pressure water flow on the soil body is good. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the present application.

[0028] Figure 2 It is a structural schematic diagram of the drill rod and the drill bit in the present application.

[0029] Figure 3 It is an enlarged schematic diagram of A part in Figure 2

[0030] Figure 4 It is an enlarged schematic diagram of B part in Figure 2

[0031] Figure 5 It is a structural schematic diagram of the spiral segment on the detection rod in the present application.

[0032] In the above figure, the drill rod 1, the high-pressure slurry pipe 11, the high-pressure water pipe 12, the mounting hole 13, the gear 131, the protective cover 132, the drill bit 2, the detection hole 21, the sliding block 22, the stirring blade 3, the jet nozzle group 4, the jet nozzle 41, the water jet nozzle group 5, the water jet nozzle 51, the rotating shaft 511, the motor 512, the same motion mechanism 6, the first support 61, the through hole 612, the magnetic control switch 613, the rack 611, the elastic assembly 7, the detection rod 8, the sliding groove 81, the straight segment 811, the spiral segment 812, the magnetic block 82, and the pile hole 9. DETAILED DESCRIPTION

[0033] The present application will be further described in detail in combination with specific embodiments and the drawings.

[0034] Referring to Figures 1 to 5 ​​The application discloses a long spiral double-pipe high-pressure stirring jet pile construction device, which comprises a long spiral drilling machine, a drill rod 1 and a drill bit 2, wherein the drill rod 1 is a hollow structure, the inside of the drill rod 1 is provided with a high-pressure slurry conveying pipe 11 and a high-pressure water pipe 12, the side wall of the drill rod 1 is provided with stirring blades 3, a multi-layer slurry jet nozzle group 4 and a multi-layer water jet nozzle group 5, the slurry jet nozzle group 4 is composed of a plurality of slurry jet nozzles 41 which are communicated with the high-pressure slurry conveying pipe 11, and the water jet nozzle group 5 is composed of a plurality of water jet nozzles 51 which are communicated with the high-pressure water pipe 12.

[0035] The water jet nozzle 51 is rotatably arranged on the side wall of the drill rod 1, the inside of the drill rod 1 is further provided with a same-motion mechanism 6, an elastic component 7 and a detection rod 8, the top of the detection rod 8 is fixedly connected with the same-motion mechanism 6 after penetrating through the elastic component 7, the same-motion mechanism 6 is matched with one end of the water jet nozzle 51 which is away from a water jet opening, and the bottom of the detection rod 8 is axially penetrated through the drill bit 2 and is in contact with the bottom surface of a pile hole 9.

[0036] The water jet nozzle 51 has a first position and a second position, when the water jet nozzle 51 is in the first position, the water flow falling point of the water jet nozzle 51 is on the side wall of the pile hole 9 and is located outside the outer diameter of the stirring blades 3, and when the water jet nozzle 51 is in the second position, the water flow falling point of the water jet nozzle 51 is on the bottom surface of the pile hole 9 and is located outside the outer diameter of the drill bit 2.

[0037] During the process that the construction device drills into the soil of the pile hole 9, the detection rod 8 is compressed by the force from the soil, the elastic component 7 is moved upwards, or the detection rod 8 is moved downwards under the elastic force from the compressed elastic component 7.

[0038] The same-motion mechanism 6 drives the water jet nozzle 51 to rotate downwards from the first position to the second position when the detection rod 8 moves upwards, or drives the water jet nozzle 51 to rotate upwards from the second position to the first position when the detection rod 8 moves downwards.

[0039] A sliding groove 81 is formed in the side wall of the detection rod 8, the sliding groove 81 comprises a straight section 811 arranged vertically along the side wall of the detection rod 8 and a spiral section 812 arranged circumferentially, the top of the straight section 811 is connected with the bottom of the spiral section 812, the drill bit 2 is provided with a detection hole 21 along the central axis of the drill bit 2, and the inner wall of the detection hole 21 is fixedly connected with a sliding block 22 which slides along the sliding groove 81.

[0040] The included angle between the two ends of the spiral section 812 is not greater than 45°.

[0041] The water nozzle 51 is rotatably arranged in the mounting hole 13 on the sidewall of the drill rod 1, and is fixedly connected with the middle part of the gear 131 arranged in the mounting hole 13. The same motion mechanism 6 comprises a first support 61, which is a barrel-shaped structure with an opening facing upwards, and the bottom end of which is fixedly connected with the top of the detection rod 8. A gear rack 611 is arranged on the outer sidewall of the first support 61, and the gear rack 611 is engaged with the gear 131 when the sliding block 22 is located in the spiral section 812.

[0042] The upper end of the water nozzle 51 is arranged in the mounting hole 13 through a rotating shaft 511, and the rotating shaft 511 is in transmission connection with a motor 512.

[0043] The motor 512 is used to drive the rotating shaft 511 to rotate, so as to adjust the spray angle of the water nozzle 51 in the first position.

[0044] The top of the detection rod 8 extends into the first support 61 through a through hole 612 arranged in the middle of the bottom end of the first support 61, and the sidewall of the detection rod 8 is fixedly connected with the inner wall of the through hole 612. A magnetic block 82 is arranged on the part of the detection rod 8 extending into the first support 61. A magnetic control switch 613 is arranged in the first support 61, and the magnetic control switch 613 is in signal connection with the motor 512.

[0045] The magnetic control switch 613 is used to send a power-off signal to the motor 512 when the magnetic control switch 613 is aligned with the magnetic block 82.

[0046] The water nozzle group 5 is located below the jetting nozzle group 4, and the multiple water nozzle groups 5 are arranged vertically along the drill rod 1 from top to bottom. The multiple water nozzles 51 in the same water nozzle group 5 are uniformly arranged around the circle of the drill rod 1. The water streams sprayed by the multiple water nozzles 51 in the same vertical row of different water nozzle groups 5 in the first position meet at point A, which is located on the sidewall of the pile hole 9 and outside the outer diameter of the stirring blade 3. The water streams sprayed by the multiple water nozzles 51 in the same vertical row of different water nozzle groups 5 in the second position meet at point B, which is located on the bottom surface of the pile hole 9 and outside the outer diameter of the drill bit 2.

[0047] The same motion mechanism 6 further comprises a second support, which is a barrel-shaped structure with an opening facing downwards, and the bottom of which is fixedly connected with the middle part of the top surface of the drill bit 2. The elastic component 7 is located in the second support, and the two ends of the elastic component 7 are respectively in abutment with the lower surface of the top end of the second support and the top surface of the drill bit 2. The elastic component 7 is a spring. The bottom of the detection rod 8 extends out to the outside of the bottom end of the drill bit 2 through the top end of the second support, the elastic component 7 and the drill bit 2 in sequence.

[0048] A protective cover 132 is arranged on the mounting hole 13, and a movable opening for the rotation of the water nozzle 51 is arranged on the protective cover 132.

[0049] A construction method of a long spiral double-tube high-pressure stirring and jetting pile construction device, the construction method is specifically:

[0050] The drilling rod 1 and the drill bit 2 on the construction device are rotated to drill into the center point of the pile hole 9, high-pressure water flow is sprayed through the water nozzle 51, and high-pressure cement slurry is sprayed through the jetting nozzle 41 at the same time, until the designed depth of the pile hole 9 is drilled; during the drilling process, when drilling in soft soil layer, the force from the soft soil body is not enough to push the probe rod 8, at this time the water nozzle 51 is in the first position, the water flow sprayed by the water nozzle 51 falls on the sidewall of the pile hole 9 and is located outside the outer diameter of the stirring blade 3, cutting the soil body around the pile hole 9, forming a diameter expansion effect, when drilling in hard soil layer, the force from the hard soil body pushes the probe rod 8 to compress the elastic component 7 to move upward, the upward movement of the probe rod 8 drives the same movement mechanism 6 to move upward, the upward movement of the same movement mechanism 6 drives the water nozzle 51 to rotate from the first position to the second position, the water nozzle 51 in the second position sprays water flow falling on the bottom surface of the pile hole 9 and located outside the outer diameter of the drill bit 2, cutting the soil body at the bottom of the pile hole 9, forming a rock breaking effect.

[0051] Embodiment 1:

[0052] Referring to Figure 1 A long spiral double-tube high-pressure stirring and jetting pile construction device, comprising a long spiral drilling machine, a drilling rod 1, and a drill bit 2, the drilling rod 1 is a hollow structure, the inside of which is provided with a high-pressure slurry conveying pipe 11 and a high-pressure water pipe 12, the sidewall of which is provided with a stirring blade 3, a multi-layer jetting nozzle group 4, and a multi-layer water nozzle group 5, the stirring blade 3 is a single-leaf blade, and the number of stirring blades 3 is multiple, which are uniformly distributed around the outer wall of the bottom of the drilling rod 1, the jetting nozzle group 4 is arranged above the stirring blade 3 and is composed of multiple jetting nozzles 41, the jetting nozzles 41 are in communication with the high-pressure slurry conveying pipe 11 through a rotary joint, the water nozzle group 5 is arranged below the stirring blade 3, the number of water nozzle groups 5 is at least two, and each water nozzle group 5 is composed of multiple water nozzles 51, the water nozzles 51 are in communication with the high-pressure water pipe 12 through a rotary joint, and the water nozzles 51 are rotatably arranged on the sidewall of the drilling rod 1, the water nozzles 51 have a first position and a second position, the inside of the drilling rod 1 is further provided with a same movement mechanism 6, an elastic component 7, and a probe rod 8, the top of the probe rod 8 passes through the elastic component 7 and is fixedly connected with the same movement mechanism 6, the same movement mechanism 6 cooperates with the end of the water nozzle 51 away from the water nozzle, and the bottom of the probe rod 8 is in contact with the bottom surface of the pile hole 9 after axially passing through the drill bit 2;

[0053] The construction method of the above-mentioned long spiral double-tube high-pressure stirring and jetting pile construction device is specifically:

[0054] The drilling rod 1 and the drill bit 2 on the construction device are aligned with the center point of the pile hole 9, the drill bit 2 is rotated to drill into the soil, and at the same time, high-pressure water flow is sprayed through the water nozzle 51 and high-pressure cement slurry is sprayed through the mortar nozzle 41 until the designed depth of the pile hole 9 is reached;

[0055] The initial position of the water nozzle 51 is the first position, when drilling into soft soil, the force from the soft soil is not enough to push the detection rod 8 upwards, at this time the water flow sprayed by the water nozzle 51 falls on the sidewall of the pile hole 9 and is located outside the outer diameter of the stirring blade 3, with the rotation of the drilling rod 1 on the long auger, the high-pressure water flow sprayed by the water nozzle 51 cuts the soil around the pile hole 9, and the stirring blade 3 stirs the slurry in the pile hole 9, which can effectively achieve the effect of expanding the pile hole 9;

[0056] When drilling into hard soil, the force from the hard soil pushes the detection rod 8 to move upwards, the detection rod 8 drives the same motion mechanism 6 to move upwards, the same motion mechanism 6 drives the water nozzle 51 to rotate downwards from the first position to the second position, the water flow sprayed by the water nozzle 51 in the second position falls on the bottom surface of the pile hole 9 and is located outside the outer diameter of the drill bit 2, with the rotation of the drilling rod 1 on the long auger, the high-pressure water flow sprayed by the water nozzle 51 cuts the soil at the bottom of the pile hole 9, i.e. the rock layer around the drill bit 2, which is beneficial to reduce the wear and tear of the stirring blade 3 during drilling;

[0057] After the hard soil is broken, the detection rod 8 is driven to move downwards by the elastic force of the elastic component 7, the detection rod 8 drives the same motion mechanism 6 to move downwards, the same motion mechanism 6 drives the water nozzle 51 to rotate upwards from the second position to the first position, which can form the effect of shaking and cutting the rock layer around and at the bottom of the pile hole 9 by the water nozzle 51, and further promote the breaking effect of the water nozzle 51 on the rock layer around the drill bit 2, which is more beneficial to the low-loss rotation of the stirring blade 3.

[0058] Example 2:

[0059] The difference from example 1 is:

[0060] Reference Figures 2 to 5, the water nozzle 51 is rotatably arranged in the mounting hole 13 of the sidewall of the drill rod 1 and fixedly connected with the middle part of the gear 131 arranged in the mounting hole 13, the same motion mechanism 6 comprises a first support 61, the first support 61 is a barrel-shaped structure with an opening facing upwards, the middle part of the bottom end is fixedly connected with the top of the detection rod 8, a gear rack 611 is arranged on the outer sidewall, a sliding groove 81 is arranged on the sidewall of the detection rod 8, the sliding groove 81 comprises a straight section 811 arranged vertically along the sidewall of the detection rod 8 and a spiral section 812 arranged circumferentially, the top of the straight section 811 is connected with the bottom of the spiral section 812, the drill bit 2 is provided with a detection hole 21 along the central axis, and a sliding block 22 sliding along the sliding groove 81 is fixed on the inner wall of the detection hole 21;

[0061] When the detection rod 8 moves upwards, the sliding block 22 first slides from the bottom of the sliding groove 81 to the top of the sliding groove 81 and then enters the inside of one end of the spiral section 812, the sliding block 22 drives the detection rod 8 and the first support 61 to rotate in the sliding process in the spiral section 812, the gear rack 611 on the first support 61 is engaged with the gear 131 after the rotation of the first support 61, the detection rod 8 continues to move upwards, and the sliding block 22 slides from one end of the spiral section 812 to the other end of the spiral section 812, at this time, the gear rack 611 drives the gear 131 to rotate, the gear 131 drives the water nozzle 51 to rotate, and when the detection rod 8 is completely retracted into the drill bit 2, the water nozzle 51 is completely rotated from the first position to the second position, so that the water nozzle 51 changes from the diameter expansion state to the rock breaking state;

[0062] The maximum rotation angle of the first support 61 is the included angle between the vertical axis of one end of the spiral section 812 and the vertical axis of the other end of the spiral section 812, and the included angle is not greater than 45°;

[0063] In order to ensure that the gear rack 611 can be fully engaged with the gear 131 in the process of following the rotation of the detection rod 8, the width of the gear rack 611 is greater than the width of the gear 131, the gear rack 611 is provided with an arc-shaped structure along the width direction, and the end face of the gear rack 611 is provided with a tapered tip.

[0064] Embodiment 3:

[0065] The difference from embodiment 2 is that:

[0066] Reference Figures 2 to 5The water nozzle 51 is installed in the mounting hole 13 through a rotating shaft 511 at the end away from the water outlet, the rotating shaft 511 is connected with the motor 512 through a synchronous belt, the synchronous mechanism 6 further comprises a second bracket, the second bracket is a barrel-shaped structure with an open downward, the bottom of the second bracket is fixedly connected with the middle part of the top surface of the drill bit 2, the elastic component 7 is located in the second bracket, the two ends of the elastic component 7 are respectively abutted with the top end lower surface of the second bracket and the top surface of the drill bit 2, the elastic component 7 is a spring, the top of the detection rod 8 extends into the first bracket 61 through the through hole 612 in the middle of the bottom end of the first bracket 61, the side wall of the detection rod 8 is fixedly connected with the inner wall of the through hole 612, the magnetic block 82 is installed on the part of the detection rod 8 extending into the first bracket 61, the magnetic control switch 613 connected with the motor 512 is installed in the first bracket 61, the bottom of the detection rod 8 extends out of the bottom end of the drill bit 2 through the top end of the second bracket, the elastic component 7 and the drill bit 2 in sequence;

[0067] The motor 512 is used for driving the rotating shaft 511 to rotate, so as to adjust the spray angle of the water nozzle 51 in the first position, and realize the convenient adjustment of the expansion range of the water nozzle 51 in the expansion state, the motor 512 can be a servo motor or a direct current motor without brake, and a speed reducer can be connected with the output shaft of the motor 512, so as to realize the accurate control of the rotating shaft 511;

[0068] In order to avoid the interference of the motor 512 on the change of the working state of the water nozzle 51, when the sliding block 22 slides into the inside of the spiral section 812 through the sliding groove 81, the magnetic block 82 is aligned with the magnetic control switch 613, at this time, the magnetic control switch 613 sends a power-off signal to the motor 512, the motor 512 switches the power supply and releases the control of the rotating shaft 511, at the same time, the synchronous mechanism 6 drives the water nozzle 51 to rotate downward, so that the water nozzle 51 changes the working state, thereafter, as long as the sliding block 22 still slides in the spiral section 812, the motor 512 always keeps the power-off state, so as to avoid the phenomenon that the water nozzle 51 is stuck or the motor 512 is overloaded due to the fact that the operator mistakenly starts the motor 512 through the control panel of the motor 512, once the sliding block 22 moves downward into the inside of the sliding groove 81, the power supply of the motor 512 is quickly turned on, and the control of the rotating shaft 511 is recovered;

[0069] In order to ensure that the rotating shaft 511 can rotate to the initial position when the rotating shaft 511 is not limited by the rack 611 and the gear 131, a reset member can be arranged between the rotating shaft 511 and the hole wall of the mounting hole 13, the reset member can be a torsional spring, one end of the torsional spring is fixedly connected with the rotating shaft 511, and the other end is fixedly connected with the hole wall of the mounting hole 13.

[0070] Embodiment 4:

[0071] The difference from embodiment 1 is that:

[0072] ReferenceFigures 2 to 5 The water jet nozzle group 5 is located below the jetting nozzle group 4, and the multi-layer water jet nozzle group 5 is arranged vertically from top to bottom along the drill rod 1, and the multiple water jet nozzles 51 in the same water jet nozzle group 5 are uniformly arranged around the drill rod 1, and the water flows sprayed by the multiple water jet nozzles 51 in the same vertical row in different water jet nozzle groups 5 at the first position meet at point A, which is located on the side wall of the pile hole 9 and outside the outer diameter of the stirring blade 3, and the water flows sprayed by the multiple water jet nozzles 51 in the same vertical row in different water jet nozzle groups 5 at the second position meet at point B, which is located on the bottom surface of the pile hole 9 and outside the outer diameter of the drill bit 2.

[0073] Embodiment 5:

[0074] The difference from embodiment 1 is that:

[0075] Reference Figure 2 A protective cover 132 is arranged on the mounting hole 13, which can be a rubber cover or a waterproof canvas cover, and a movable opening for the rotation of the water jet nozzle 51 is formed on the protective cover 133.

Claims

1. A long spiral double-tube high-pressure stirring jet pile construction device, comprising a long spiral drilling machine, a drill rod (1) and a drill bit (2), the drill rod (1) being of a hollow structure, with a high-pressure slurry conveying pipe (11) and a high-pressure water pipe (12) arranged inside, and with stirring blades (3), a multi-layer jet grouting nozzle group (4) and a multi-layer water jet nozzle group (5) arranged on the side wall, the jet grouting nozzle group (4) being composed of a plurality of jet grouting nozzles (41) in communication with the high-pressure slurry conveying pipe (11), and the water jet nozzle group (5) being composed of a plurality of water jet nozzles (51) in communication with the high-pressure water pipe (12), characterized in that: the water jet nozzles (51) are rotatably arranged on the side wall of the drill rod (1), and the drill rod (1) further comprises a same-motion mechanism (6), an elastic assembly (7) and a detection rod (8), the top of the detection rod (8) penetrates through the elastic assembly (7) and is fixedly connected with the same-motion mechanism (6), the same-motion mechanism (6) cooperates with the end of the water jet nozzle (51) away from the water jet opening, and the bottom of the detection rod (8) penetrates through the drill bit (2) in an axial direction and is in contact with the bottom surface of the pile hole (9); the water jet nozzle (51) has a first position and a second position, when the water jet nozzle (51) is in the first position, the water jet falls on the side wall of the pile hole (9) and is located outside the outer diameter of the stirring blade (3), and when the water jet nozzle (51) is in the second position, the water jet falls on the bottom surface of the pile hole (9) and is located outside the outer diameter of the drill bit (2); the detection rod (8) is compressed by the force from the soil during the drilling of the construction device into the soil of the pile hole (9), and moves upward, or moves downward under the elastic force from the compressed elastic assembly (7); the same-motion mechanism (6) drives the water jet nozzle (51) to rotate downward from the first position to the second position when the detection rod (8) moves upward, or drives the water jet nozzle (51) to rotate upward from the second position to the first position when the detection rod (8) moves downward; the water jet nozzle group (5) is located below the jet grouting nozzle group (4), the multi-layer water jet nozzle group (5) is arranged vertically from top to bottom along the drill rod (1), and the plurality of water jet nozzles (51) in the same water jet nozzle group (5) are uniformly arranged around the drill rod (1), the water jet nozzles (51) in the same vertical row in different water jet nozzle groups (5) are in the first position, and the water jet nozzles (51) in the same vertical row in different water jet nozzle groups (5) are in the second position, the water jet nozzles (51) in the same vertical row in different water jet nozzle groups (5) are in the first position, and the water jet nozzles (51) in the same vertical row in different water jet nozzle groups (5) are in the second position, the water jet nozzles (51) in the same vertical row in different water jet nozzle groups (5) are in the first position, and the water jet nozzles (51) in the same vertical row in different water jet nozzle groups (5) are in the second position, the water jet nozzles (51) in the same vertical row in different water jet nozzle groups (5) are in the first position, and the water jet nozzles (51) in the same vertical row in different water jet nozzle groups (5) are in the second position, the water jet nozzles (51) in the same vertical row in different water jet nozzle groups (5) are in the first position, and the water jet nozzles (51) in the same vertical row in different water jet nozzle groups (5) are in the second position, the water jet nozzles (51) in the same vertical row in different water jet nozzle groups (5) are in the first position, and the water jet nozzles (51) in the same vertical row in different water jet nozzle groups (5) are in the second position, the water jet nozzles (51) in the same vertical row in different water jet nozzle groups (5) are in the first position, and the water jet nozzles (51) in the same vertical row in different water jet nozzle groups (5) are in the second position, the water jet nozzles (51) in the same vertical row in different water jet nozzle groups (5) are in the first position, and the water jet nozzles (51) in the same vertical row in different water jet nozzle groups (5) are in the second position, the water jet nozzles (51) in the same vertical row in different water jet nozzle groups (5) are in the first position, and the water jet nozzles (51) in the same vertical row in different water jet nozzle groups (5) are in the second position, the water jet nozzles (51) in the same vertical row in different water jet nozzle groups (5) are in the first position, and the water jet nozzles (51) in the same vertical row in different water jet nozzle groups (5) are in the second position, the water jet nozzles (51) in the same vertical row in different water jet nozzle groups (5) are in the first position, and the water jet nozzles (51) in the same vertical row in different water jet nozzle groups (5) are in the second position, the water jet nozzles (51) in the same vertical row in different water jet nozzle groups (5) are in the first position, and the water jet nozzles (51) in the same vertical row in different water jet nozzle groups (5) are in the second position, the water jet nozzles (51) in the same vertical row in different water jet nozzle groups (5) are in the first position, and the water jet nozzles (51) in the same vertical row in different water jet nozzle groups (5) are in the second position, the water jet nozzles (51) in the same vertical row in different water jet nozzle groups (5) are in the first position, and the water jet nozzles (51) in the same vertical row in different water jet nozzle groups (5) are in the second position, the water jet nozzles (51) in the same vertical row in different water jet nozzle groups (5) are in the first position, and the water jet nozzles (51) in the same vertical row in different water jet nozzle groups (5) are in the second position, the water jet nozzles (51) in the same vertical row in different water jet nozzle groups (5) are in the first position, and the water jet nozzles (51) in the same vertical row in different water jet nozzle groups (5) are in the second position, the water jet nozzles (51) in the same vertical row in different water jet nozzle groups (5) are in the first position, and the water jet nozzles (51) in the same vertical row in different water jet nozzle groups (5) are in the second position, the water jet nozzles (51) in the same vertical row in different water jet nozzle groups (5) are in the first position, and the water jet nozzles (51) in the same vertical row in different water jet nozzle groups (5) are in the second position, the water jet nozzles (51) in the same vertical row in different water jet nozzle groups (5) are in the first position, and the water jet nozzles (51) in the same vertical row in different water jet nozzle groups (5) are in the second position, the water jet nozzles (51) in the same vertical row in different water jet nozzle groups (5) are in the first position, and the water jet nozzles (51) in the same vertical row in different water jet nozzle groups (5) are in the second position, the water jet nozzles (51) in the same vertical row in different water jet nozzle groups (5) are in the first position, and the water jet nozzles (51) in the same vertical row in different water jet nozzle groups (5) are in the second position, the water jet nozzles (51) in the same vertical row in different water jet nozzle groups (5) are in the first position, and the water jet nozzles (51) in the same vertical row in different water jet nozzle groups (5) are in the second position, the water jet nozzles (51) in the same vertical row in different water jet nozzle groups (5) are in the first position, and the water jet nozzles (51) in the same vertical row in different water jet nozzle groups (5) are in the second position, the water jet nozzles (51) in the same vertical row in different water jet nozzle groups (5) are in the first position, and the water jet nozzles (51) in the same vertical row in different water jet nozzle groups (5) are in the second position, the water jet nozzles ​ A sliding groove (81) is formed in the side wall of the detection rod (8), the sliding groove (81) comprises a straight section (811) vertically arranged along the side wall of the detection rod (8) and a helical section (812) circumferentially arranged, the top of the straight section (811) is connected with the bottom of the helical section (812), the drill bit (2) is provided with a detection hole (21) along the central axis thereof, and an inner wall of the detection hole (21) is fixedly provided with a sliding block (22) sliding along the sliding groove (81).

2. The long spiral double-tube high-pressure jet grouting pile construction device according to claim 1, characterized in that: An included angle between two ends of the helical section (812) is not greater than 45°.

3. The long spiral double-tube high-pressure jet grouting pile construction device according to claim 1 or 2, characterized in that: The water nozzle (51) is rotatably arranged in an installation hole (13) formed in the side wall of the drill rod (1) and is fixedly connected with the middle part of a gear (131) arranged in the installation hole (13), the same motion mechanism (6) comprises a first support (61), the first support (61) is a bucket-shaped structure with an opening facing upwards, the middle part of the bottom end of the first support (61) is fixedly connected with the top of the detection rod (8), and a gear rack (611) is arranged on the outer side wall of the first support (61), the gear rack (611) is engaged with the gear (131) when the sliding block (22) is located in the helical section (812).

4. The long spiral double-pipe high-pressure jetting pile construction device according to claim 3, characterized in that: The water nozzle (51) is arranged in the installation hole (13) through a rotating shaft (511), and the rotating shaft (511) is in transmission connection with the motor (512). The motor (512) is used for driving the rotating shaft (511) to rotate, so as to adjust the jetting angle of the water nozzle (51) in the first position.

5. The long spiral double-pipe high-pressure jetting pile construction device according to claim 4, characterized in that: The top of the detection rod (8) extends into the first support (61) through a through hole (612) formed in the middle part of the bottom end of the first support (61), the side wall of the detection rod (8) is fixedly connected with the inner wall of the through hole (612), a magnetic block (82) is arranged on the part of the detection rod (8) extending into the first support (61), a magnetic control switch (613) is arranged in the first support (61), and the magnetic control switch (613) is in signal connection with the motor (512). The magnetic control switch (613) is used for sending a power-off signal to the motor (512) when the magnetic control switch (613) is aligned with the magnetic block (82).

6. The long spiral double-tube high-pressure jet grouting pile construction device according to claim 3, characterized in that: The same motion mechanism (6) further comprises a second support, the second support is a bucket-shaped structure with an opening facing downwards, the bottom of the second support is fixedly connected with the middle part of the top surface of the drill bit (2), the elastic component (7) is located in the second support, the two ends of the elastic component (7) are respectively in abutment with the lower surface of the top end of the second support and the top surface of the drill bit (2), the elastic component (7) is a spring, and the bottom of the detection rod (8) extends out of the bottom end of the drill bit (2) through the top end of the second support, the elastic component (7) and the drill bit (2) in sequence.

7. The long spiral double-tube high-pressure jet grouting pile construction device according to claim 3, characterized in that: A protective cover (132) is arranged on the installation hole (13), and a movable opening is formed in the protective cover (132) for the rotation of the water nozzle (51).

8. The construction method of a long spiral double-tube high-pressure jetting pile construction device according to claim 1, characterized in that: The construction method is specifically: The drill rod (1) and drill bit (2) of the construction device are rotated to drill into the center point of the pile hole (9), while the high-pressure water jet is sprayed through the water nozzle (51) and the high-pressure cement slurry is sprayed through the mortar nozzle (41) until the designed depth of the pile hole (9) is drilled; during the drilling process, when drilling into soft soil layer, the force from the soft soil is not enough to push the probe rod (8), at this time the water nozzle (51) is in the first position, the water jet falls on the sidewall of the pile hole (9) and is located outside the outer diameter of the stirring blade (3), cutting the soil around the pile hole (9) to form an expanding effect, when drilling into hard soil layer, the force from the hard soil pushes the probe rod (8) to compress the elastic component (7) to move upwards, the upward movement of the probe rod (8) drives the same motion mechanism (6) to move upwards, the upward movement of the same motion mechanism (6) drives the water nozzle (51) to rotate from the first position to the second position, the water jet falls on the bottom surface of the pile hole (9) and is located outside the outer diameter of the drill bit (2) when the water nozzle (51) is in the second position, cutting the soil at the bottom of the pile hole (9) to form a rock breaking effect.

Images