Cement mixing pile drilling machine for sand ground construction

Abstract

The application discloses a cement mixing pile drilling machine for sand ground construction, which comprises a rotary device slidingly arranged on an anchor rod drilling machine rack, a mixing shaft connected to an output end of the rotary device, a drill bit arranged at a bottom end of the mixing shaft, a plurality of mixing blades arranged on an outer wall of the mixing shaft, a fixed plate arranged at a bottom end of an outer shell of the rotary device, and a base cylinder arranged at the bottom of the fixed plate, wherein the mixing shaft is coaxially arranged and penetrates through the base cylinder. A rotary sleeve is rotatably arranged in the base cylinder, a fixed outer sleeve is fixed to a bottom end of the rotary sleeve through a fixed rod, and the mixing blades are wrapped around the fixed outer sleeve; a gap is formed between the rotary sleeve and the mixing shaft, an extension rod arranged at the bottom of the base cylinder is provided with a linkage gear, the linkage gear is respectively engaged with an outer ring gear of the mixing shaft and a long strip-shaped inner ring gear of the rotary sleeve, and a reciprocating structure for driving the rotary sleeve to axially reciprocate when rotating is arranged in the base cylinder. The application can avoid damaging the outer wall of a pile hole in the sand ground when the drill bit and the mixing blades are drilling and mixing, improve the pile construction quality, and reasonably control the torsion force borne by the mixing shaft.

Description

Technical Field

[0001] This invention relates to the field of cement mixing pile treatment, specifically to a cement mixing pile drilling rig for construction in sandy areas. Background Technology

[0002] Cement mixing piles are formed by forcibly mixing cement and other hardening agents with the foundation soil in situ using a specially designed mixer, thus hardening the soft soil and increasing the foundation strength to reinforce weak foundations. This method is suitable for treating soft soil foundations and backfilling areas such as abutments, and has the advantages of significant treatment effects and rapid commissioning after treatment.

[0003] During the construction of cement-soil mixing piles, when the construction site is sandy, the sidewalls of the pile hole are prone to collapse when the mixing drill enters the ground and the mixing is carried out by the mixing blades. This results in poor hole quality of the cement mixing pile and affects the construction effect of the pile body. Summary of the Invention

[0004] The purpose of this invention is to provide a cement mixing pile drilling rig for sandy land construction, so as to solve the above-mentioned technical problems.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a cement mixing pile drilling rig for sandy land construction, comprising a base, an anchor drilling rig frame mounted on the base, and an anchor rotary drilling system mounted on the anchor drilling rig frame. The anchor rotary drilling system includes a rotary head, which is slidably mounted on the anchor drilling rig frame. The output end of the rotary head is connected to a mixing shaft. A fixing plate is fixed to the bottom end of the rotary head housing. A drill bit is fixed to the bottom end of the mixing shaft. Multiple sets of mixing blades are provided on the outer wall of the mixing shaft.

[0006] The bottom end face of the fixed plate is provided with a base cylinder. The stirring shaft is coaxially arranged with the base cylinder and rotatably arranged inside the base cylinder. A rotating sleeve is coaxially rotatably arranged inside the base cylinder. The bottom end of the rotating sleeve extends downward to the outside of the base cylinder. Multiple sets of fixing rods are fixed to the bottom of the outer peripheral wall of the rotating sleeve, and an outer protective sleeve is coaxially fixed through the fixing rods. The outer protective sleeve surrounds and covers the stirring blade on the inner side. A gap is formed between the rotating sleeve and the stirring shaft. An extension rod is fixed at the bottom of the base cylinder within the gap. A linkage gear is rotatably provided at the bottom end of the extension rod. The outer wall of the stirring shaft is provided with an outer ring tooth that meshes with the linkage gear. The inner wall of the rotating sleeve is provided with an inner ring tooth that meshes with the linkage gear. The teeth of the inner ring tooth are elongated. A reciprocating structure is provided inside the base cylinder to drive the rotating sleeve to slide up and down. The reciprocating structure causes the rotating sleeve to undergo axial reciprocating motion when it rotates.

[0007] By adopting the technical scheme, the rotary driver drives the stirring shaft to rotate, the drill bit drills a hole first, the stirring shaft drives the linkage gear at the bottom of the base cylinder to rotate through the outer wall outer ring teeth, and the linkage gear further drives the rotary sleeve to rotate; meanwhile, the reciprocating structure in the base cylinder drives the rotary sleeve to rotate and reciprocate up and down along the axial direction, the rotary sleeve drives the outer protective sleeve to rotate and move up and down synchronously through the fixed rod, the outer protective sleeve always covers the stirring blade, synchronously adheres to the inner wall of the pile hole with the drilling depth, and the stirring blade only stirs the soil and the curing agent inside the protective sleeve, so that direct contact with the hole wall is avoided, the problem of collapse of the side wall of the sand pile hole is effectively solved, the protection and synchronous adhesion of the outer protective sleeve are realized, and the hole quality is ensured; through the cooperation of the gear transmission and the reciprocating motion of the rotary sleeve, the torque of the stirring shaft is balanced and transmitted, the equipment is prevented from being damaged by overload torque, and the cooperation of drilling and stirring is realized, and the construction stability is improved.

[0008] Preferably, the extension rods are symmetrically arranged on both sides of the stirring shaft, and linkage gears are rotationally arranged at the bottom ends of the extension rods on both sides. The inner side of the linkage gear is engaged with the inner ring teeth, and the outer side is engaged with the outer ring teeth.

[0009] By adopting the technical scheme, when the stirring shaft rotates, the outer ring teeth of the outer wall of the stirring shaft drive the linkage gears at the bottom ends of the extension rods on both sides, the linkage gears on both sides synchronously engage with the inner ring teeth of the rotary sleeve, and the rotary sleeve is driven to rotate; because the transmission forces on both sides are symmetrical, the rotary sleeve does not deviate radially, and always remains coaxial with the stirring shaft, thereby stably covering the stirring blade with the outer protective sleeve, the protection force received by the hole wall around is uniform, the symmetrical transmission of the stirring shaft and the rotary sleeve is realized, the transmission stability and force balance are improved, and the stirring shaft is prevented from being twisted by eccentric load and the rotary sleeve is prevented from deviating; the protection effect of the outer protective sleeve is more uniform, the risk of local collapse of the hole wall is further reduced, and the service life of the transmission components is prolonged.

[0010] Preferably, the reciprocating structure includes a reciprocating spiral groove and a guide shaft. The base cylinder is internally provided with an annular groove, the rotary sleeve is rotationally arranged in the annular groove, and the rotary sleeve is slidably arranged in the annular groove along the axial direction. The reciprocating spiral groove is arranged on the inner wall of the annular groove of the base cylinder. The guide shaft is fixed to the inner wall of the rotary sleeve and has one end inserted into the reciprocating spiral groove. The one end of the guide shaft is slidably connected with the reciprocating spiral groove.

[0011] By adopting the technical scheme, when the rotary sleeve rotates, the fixed guide shaft on the inner wall of the rotary sleeve is embedded into the reciprocating spiral groove in the inner wall of the annular groove of the base cylinder. While the guide shaft makes a circular motion with the rotary sleeve, it slides along the track of the reciprocating spiral groove, thereby driving the rotary sleeve to reciprocate up and down along the axial direction, and realizing the cycle operation of the sinking of the outer protective sleeve, the stirring and crushing of the stirring blade, and the rising of the outer protective sleeve to the same height as the stirring blade.

[0012] Preferably, the stirring blade comprises a base rod, a stirring blade and a driving angle adjusting rod, one end of the base rod is fixed to the stirring shaft, the free end extends outward, the stirring blade is rotatably sleeved on the base rod, the angle adjusting rod is arranged in the base rod in the axial direction and is slidably arranged in the base rod, a sliding shaft is arranged on the outer wall of the base rod, a helical groove is arranged on the inner wall of the stirring blade, the sliding shaft penetrates through the base rod and extends into the helical groove, the free end of the sliding shaft is slidably connected with the helical groove, a sliding groove is arranged on the base rod for the sliding of the sliding shaft, and a pulling member is arranged in the base rod for applying an inward pulling force to the angle adjusting rod.

[0013] By adopting the above technical scheme, if the sand ground is hard, the stirring blade is subjected to increased resistance, thereby driving the angle adjusting rod to slide outward along the base rod in the axial direction to push the sliding shaft to slide along the helical groove, the stirring blade rotates around the base rod to increase the angle, reduce the stirring contact area and reduce the stress per unit area; if the sand ground is soft, the sliding shaft resets along the helical groove, the angle of the stirring blade is reduced, the contact area of the stirring blade is increased, and the stirring efficiency is improved; the torsion of the stirring shaft is avoided to be large or small, the torsion is balanced, the angle of the stirring blade is self-adaptively adjusted, and the sand ground working conditions of different hardness and compactness are adapted.

[0014] Preferably, a rod groove is arranged in the base rod for the sliding of the angle adjusting rod, the pulling member is a spring, one end of the spring is fixed to the inner end of the rod groove, the other end is fixedly connected with the angle adjusting rod, and one end of the angle adjusting rod located outside the base rod is provided with a pulling block.

[0015] By adopting the above technical scheme, the pulling block can better control the stirring angle of the stirring blade through the impact force of the sand ground.

[0016] Preferably, the pulling block is in a circular truncated cone structure which gradually inclines outward from the end close to the angle adjusting rod to the end far from the angle adjusting rod.

[0017] By adopting the above technical scheme, the pulling block can better control the sliding of the angle adjusting rod along the base rod through the inclined outer wall and the impact of the sand ground during the rotation of the stirring shaft.

[0018] Preferably, an auxiliary sheath is arranged in the outer sheath, a sheath groove is arranged in the outer sheath for the coaxial rotation and axial sliding of the auxiliary sheath, a short rod is arranged on the outer wall of the auxiliary sheath, a one-way bearing is sleeved on the short rod, a friction helical groove is arranged on the inner wall of the sheath groove of the outer sheath for the sliding of the one-way bearing, and a pressure increasing member is arranged on the inner wall of the friction helical groove for applying a pressure to the one-way bearing.

[0019] By adopting the technical scheme, when the outer sheath rotates and reciprocates up and down, the frictional helical groove on the inner wall of the sheath groove cooperates with the one-way bearing on the short rod of the auxiliary sheath to drive the auxiliary sheath to rotate coaxially and slide axially; the booster applies pressure to the one-way bearing, and the auxiliary sheath can control the axial length exposed to the outer sheath according to the softness of the sand ground, that is, the softer the sand ground, the longer the auxiliary sheath is exposed, so that the outer wall of the pile hole of the sand ground can be protected for a longer time, and the harder the sand ground, the shorter the auxiliary sheath is exposed, so that the protection time of the outer wall of the pile hole of the sand ground can be appropriately reduced to avoid excessive torsion of the stirring shaft.

[0020] Preferably, the booster is a spiral rubber layer arranged in the frictional helical groove, the spiral rubber layer is arranged on the inner wall of the frictional helical groove in the same direction as the frictional helical groove, and the spiral rubber layer gradually thickens from the lower end to the upper end.

[0021] By adopting the technical scheme, the effect that the auxiliary sheath is moved upward on the outer sheath when the pressure received by the auxiliary sheath in the sand ground is greater is realized, and the auxiliary sheath is prevented from descending after being moved upward by the one-way bearing, so that the sinking effect of the auxiliary sheath in the sand ground is ensured.

[0022] Preferably, a plurality of groups of the short shafts on the auxiliary sheath and the one-way bearings on the short shafts are arranged in the frictional helical groove and are uniformly arranged in the spiral direction.

[0023] By adopting the technical scheme, the stability and stress balance of the movement of the auxiliary sheath are improved, and local overload is avoided to cause jamming or damage to components.

[0024] Preferably, the bottom of the auxiliary sheath is uniformly provided with sawtooth grooves on the periphery.

[0025] By adopting the technical scheme, when the auxiliary sheath drills downward with the outer sheath, the sawtooth grooves on the bottom cut into the bottom and the surrounding sand ground of the hole wall, on the one hand, the sawtooth grooves compact the loose soil body by engagement, and on the other hand, the sawtooth grooves cut the caked sand ground, break the soil body aggregation structure, and facilitate the subsequent stirring blade to mix the soil body and the curing agent.

[0026] Compared with the prior art, the present application has the following advantages:

[0027] The present application effectively prevents the collapse of the sidewall of the sand ground pile hole and improves the pile forming quality: the outer sheath surrounds and covers the stirring blade, cooperates with the auxiliary sheath, blocks the collapse of the sand ground soil body into the pile hole during stirring, and the auxiliary sheath can further stabilize the hole wall, thereby solving the core problem of poor hole forming quality in sand ground construction.

[0028] Reasonable control of stirring shaft torsion, optimization of stirring adaptability and efficiency: the meshing transmission of the outer ring tooth, the inner ring tooth and the linkage gear makes the stirring shaft and the outer sleeve reversely rotate to realize force balance and stability, the axial reciprocating motion structure of the rotary sleeve makes the drill bit drill into the sand at one end, then the outer sleeve drills into the sand, and then the stirring blade stirs and crushes the sand in the outer sleeve, realizes the more balanced force of the stirring shaft, avoids torsion overload; at the same time, the stirring blade can flexibly adjust the stirring angle through the cooperation of the angle adjusting rod, the sliding shaft and the spiral groove, adapt to different stress working conditions of the stirring blade in different sand, improve the stirring uniformity and construction efficiency, and the tension member can ensure the stability of the stirring blade angle. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0030] Figure 1 is the present application highlighting the prior art schematic diagram;

[0031] Figure 2 is the overall structure schematic diagram of the present application highlighting the stirring shaft, the drill bit and the outer sleeve;

[0032] Figure 3 is the exploded schematic diagram of the present application highlighting the outer sleeve, the stirring shaft and the stirring blade;

[0033] Figure 4 is the schematic diagram highlighting the inner ring tooth of the present application;

[0034] Figure 5 is the enlarged schematic diagram of part A in Figure 4

[0035] Figure 6 is the cross-sectional schematic diagram of the present application highlighting the stirring blade;

[0036] Figure 7 is the exploded schematic diagram of the present application highlighting the stirring blade.

[0037] Figure 8 is the exploded schematic diagram of the present application highlighting the outer sleeve and the auxiliary sleeve;

[0038] Figure 9 is the exploded schematic diagram of part B in Figure 8

[0039] In the drawings, the component list represented by each number is as follows:

[0040] ​​1, base; 2, anchor rod drilling machine frame; 3, anchor rod rotary drilling system; 4, fixed plate; 5, base cylinder; 6, stirring shaft; 7, drill bit; 8, stirring blade; 81, base rod; 82, stirring blade; 83, angle adjusting rod; 9, rotary sleeve; 10, fixed rod; 11, outer sheath; 12, extension rod; 13, linkage gear; 14, outer ring tooth; 15, inner ring tooth; 16, annular groove; 17, reciprocating helical groove; 18, guide shaft; 19, rod groove; 20, sliding shaft; 21, helical groove; 22, sliding groove; 23, spring; 24, pull block; 25, auxiliary sheath; 26, sheath groove; 27, short rod; 28, one-way bearing; 29, friction helical groove; 30, helical rubber layer; 31, sawtooth groove; 32, positioner; 33, rotary. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0042] Please refer to Figures 1-9 The present application provides a technical solution:

[0043] The cement mixing pile drilling machine for sand construction disclosed by the present application aims to solve the technical problems of easy collapse of pile hole sidewall and imbalance of stirring shaft 6 torsion in sand construction, and the overall structure is around the core needs of protecting hole wall, balancing torsion and adapting to working conditions, and each technical feature cooperates to realize stable and efficient construction.

[0044] Please refer to Figure 1 , 2The drilling machine comprises a base 1, an anchor rod drilling machine frame 2 fixedly installed on the base 1, and an anchor rod rotary drilling system 3 assembled on the anchor rod drilling machine frame 2, wherein a rotator 33 in the system can slide up and down along the anchor rod drilling machine frame 2, the base 1, the anchor rod drilling machine frame 2 and the anchor rod rotary drilling system 3 are all prior art (see CN217150201U, a mixing pile machine for soft ground pile treatment), the output end of the rotator 33 is fixedly connected with a mixing shaft 6, the rotation of the mixing shaft 6 is realized by the output end of the rotator 33, a drill bit 7 for drilling is installed at the bottom end of the mixing shaft 6, a plurality of groups of mixing blades 8 for mixing and crushing soil bodies are uniformly distributed on the outer wall of the mixing shaft 6, a fixed plate 4 horizontally arranged is fixed at the bottom end of the rotator 33, the top end surface of the fixed plate 4 is fixed on the shell of the rotator 33 and does not interfere with the output end of the rotator 33 to drive the mixing shaft 6 to rotate, the fixed plate 4 can move on the advancing frame together with the rotator 33, the bottom end surface of the fixed plate 4 is fixed perpendicularly with a base cylinder 5, the mixing shaft 6 is coaxially arranged with the base cylinder 5 and rotates through the bearing and is arranged inside the base cylinder 5, so as to ensure the coaxiality when the mixing shaft 6 rotates. It should be noted that the anchor rod drilling machine frame 2 in the prior art is provided with a positioner 32 for stabilizing the mixing shaft 6, the fixed plate 4 in the present application is located above the positioner 32 and moves up and down together with the rotator 33, the base cylinder 5 can rotate through the positioner 32 and forms a sliding connection, and the positioner 32 can stabilize the base cylinder 5.

[0045] Referring to Figure 2 , 3, 4, 5, the base cylinder 5 coaxially provided with a rotating sleeve 9, the bottom end of the rotating sleeve 9 extends to the outside of the base cylinder 5, the outer wall of the rotating sleeve 9 is uniformly fixed with a plurality of fixed rods 10 in the circumferential direction, the end of the fixed rod 10 away from the rotating sleeve 9 is coaxially fixed with an outer sleeve 11, the outer sleeve 11 is annular structure, the outer sleeve 11 is wrapped inside all the stirring blades 8, to avoid the stirring blades 8 directly contact with the side wall of the pile hole. The rotating sleeve 9 and the stirring shaft 6 are reserved with a gap for installing transmission components, the bottom of the base cylinder 5 is vertically fixed with an extension rod 12 in the gap, the extension rod 12 is symmetrically arranged on both sides of the stirring shaft 6 (four groups can also be arranged, and the application takes two groups as an example), the bottom end of the extension rod 12 on both sides is rotatably installed with a linkage gear 13 through a bearing, the outer wall of the stirring shaft 6 is provided with an annular outer ring gear 14, the inner wall of the rotating sleeve 9 is provided with a long strip-shaped inner ring gear 15, the outer side of the linkage gear 13 is engaged with the inner ring gear 15, and the inner side is engaged with the outer ring gear 14, the long strip-shaped inner ring gear 15 can adapt to the continuous engagement of the linkage gear 13 when the rotating sleeve 9 slides up and down, to ensure the continuity of transmission. The inside of the base cylinder 5 is provided with an annular groove 16, the rotating sleeve 9 is embedded in the annular groove 16, which can rotate around its own axis and slide axially along the annular groove 16, the inner wall of the annular groove 16 is provided with a reciprocating spiral groove 17, the inner wall of the rotating sleeve 9 is vertically fixed with a guide shaft 18, the end of the guide shaft 18 away from the rotating sleeve 9 is inserted into the reciprocating spiral groove 17 and forms a sliding connection with the reciprocating spiral groove 17, constituting a reciprocating structure for driving the rotating sleeve 9 to rotate synchronously and axially reciprocate, when the drill bit 7 drills into the sand soil to a certain depth, the stirring shaft 6 continues to rotate, the outer sleeve 11 rotates and slides downward through the cooperation of the guide shaft 18 and the reciprocating spiral groove 17, since the drill bit 7 drills first, the sinking of the outer sleeve 11 is easier, after the outer sleeve 11 sinks a distance, it moves upward again through the cooperation of the guide shaft 18 and the reciprocating spiral groove 17, and at this time, since the stirring rod can continue to move downward to offset the upward movement distance of the outer sleeve 11, the outer sleeve 11 continuously rotates at the current position, at the same time, the stirring blades 8 move downward into the outer sleeve 11 and stir and crush the sand soil, after the stirring blades 82 crush the sand soil in the outer sleeve 11, the outer sleeve 11 moves downward again through the cooperation of the guide shaft 18 and the reciprocating spiral groove 17, realizing the reciprocating cycle of drilling by the drill bit 7, sinking of the outer sleeve 11 and downward movement of the stirring blades 8 into the outer sleeve 11 for soil stirring and crushing.

[0046] Referring to Figure 3 , 6, 7, the stirring blade 8 adopts a design that can self-adaptively adjust the angle, and specifically comprises a base rod 81, a stirring blade 82 and an angle adjusting rod 83, one end of the base rod 81 is fixed to the outer wall of the stirring shaft 6, the free end extends outward along the radial direction of the stirring shaft 6, the stirring blade 82 is rotatably sleeved outside the free end of the base rod 81, a rod groove 19 is formed in the base rod 81 along the axial direction, the angle adjusting rod 83 is slidingly installed in the rod groove 19 (the part of the angle adjusting rod 83 located in the rod groove 19 is non-cylindrical), a sliding groove 22 is formed in the outer wall of the base rod 81 and communicates with the rod groove 19, a sliding shaft 20 is arranged in the sliding groove 22, one end of the sliding shaft 20 is fixed to the outer wall of the angle adjusting rod 83, the other end of the sliding shaft 20 extends out of the base rod 81 and is arranged in a spiral groove 21 formed in the inner wall of the stirring blade 82 and is in sliding connection with the spiral groove 21, a spring 23 as a tension member is fixed to the bottom of the rod groove 19 in the base rod 81, the other end of the spring 23 is fixedly connected with the inner end of the angle adjusting rod 83, and the spring 23 always applies an inward tension to the angle adjusting rod 83, one end of the angle adjusting rod 83 located outside the base rod 81 is fixedly connected with a pulling block 24, the pulling block 24 is in the shape of a circular truncated cone that gradually inclines outward from the end close to the angle adjusting rod 83 to the end far from the angle adjusting rod 83, and the circular truncated pulling block 24 can collide with the sandy soil and generate a centrifugal force during the stirring process, so that the angle adjusting rod 83 moves in the rod groove 19 and drives the stirring blade 82 to adaptively adjust the angle through the cooperation of the sliding shaft 20 and the spiral groove 21.

[0047] Referring to Figure 3 , 8 , 9, the inside of the outer sheath 11 is coaxially provided with an auxiliary sheath 25, an annular sheath groove 26 is formed in the inner wall of the outer sheath 11, the auxiliary sheath 25 is fittedly installed in the sheath groove 26 and can coaxially rotate and axially slide relative to the outer sheath 11, a plurality of groups of short rods 27 are uniformly fixed on the outer wall of the auxiliary sheath 25 in a spiral direction, a one-way bearing 28 is sleeved on each group of short rods 27, a friction spiral groove 29 that is adapted to the one-way bearing 28 is formed in the inner wall of the sheath groove 26 of the outer sheath 11, a spiral rubber layer 30 as a pressure increasing member is fixed to the inner wall of the friction spiral groove 29, the spiral rubber layer 30 is arranged in the same direction as the friction spiral groove 29 and gradually thickens from the lower end to the upper end, the one-way bearing 28 is embedded in the friction spiral groove 29 and abuts against the spiral rubber layer 30, so that the force required for the auxiliary sheath 25 to move upward on the outer sheath 11 is greater, the auxiliary sheath 25 can control the length located at the bottom of the outer sheath 11 according to the hardness of the sandy soil, and sawtooth grooves 31 are uniformly formed in the bottom circumferential side of the auxiliary sheath 25 in the circumferential direction, which further enhances the sinking effect in the sandy soil. It should be noted that during the axial reciprocating movement of the outer sheath 11 and the auxiliary sheath 25 relative to the base cylinder 5, the lowest position will not be lower than the bottom end of the drill bit 7, so that the stirring shaft 6 receives smaller torsion during the sinking of the outer sheath 11 and the auxiliary sheath 25.

[0048] Referring to Figures 1-9 , in construction, the rotary device 33 is started and slides downward along the anchor rod drilling machine frame 2, drives the stirring shaft 6 to rotate, the drill bit 7 first contacts the sand and carries out drilling operation, while the stirring shaft 6 rotates, the outer ring tooth 14 on the outer wall drives the linkage gear 13 on both sides to rotate synchronously, the linkage gear 13 in turn drives the rotary sleeve 9 to rotate around the annular groove 16 in the base cylinder 5, at this time, the guide shaft 18 on the inner wall of the rotary sleeve 9 slides along the reciprocating spiral groove 17 on the base cylinder 5, on the basis of circular motion, superimposes axial reciprocating motion, drives the outer protective sleeve 11 connected by the fixed rod 10 to rotate synchronously and move downward, since the drill bit 7 has carried out drilling in advance, the outer protective sleeve 11 is more easily sunken, after the outer protective sleeve 11 is sunken by a distance, moves upward through the cooperation of the guide shaft 18 and the reciprocating spiral groove 17, and at this time, since the stirring rod can continue to move downward to offset the upward moving distance of the outer protective sleeve 11, the outer protective sleeve 11 continuously rotates at the current position, at the same time, the stirring blade 8 moves downward into the outer protective sleeve 11 and carries out stirring and crushing of the sand soil, after the stirring blade 82 pieces crush the sand soil in the outer protective sleeve 11, the outer protective sleeve 11 again moves downward through the cooperation of the guide shaft 18 and the reciprocating spiral groove 17, realizes the reciprocating cycle of drilling by the drill bit 7, sinking of the outer protective sleeve 11 and downward movement of the stirring blade 8 into the outer protective sleeve 11 to carry out soil stirring and crushing.

[0049] The drilling depth is synchronized with the pile hole wall to avoid the direct contact of the stirring blade 8 with the hole wall during the initial soil crushing, which can cause soil loosening and collapse. During the stirring process, if hard ground is encountered, the resistance on the pull block 24 increases, which overcomes the pulling force of the spring 23 to slide the angle adjusting rod 83 along the rod groove 19 of the base rod 81 outward, and then drives the stirring blade 82 to rotate through the cooperation of the sliding shaft 20 and the spiral groove 21. The rotation of the stirring blade 82 around the base rod 81 increases the angle of the stirring blade 82, reduces the unit area stress, and avoids the sudden increase of the stirring shaft 6 torque. If soft ground is encountered, the stress on the stirring blade 82 decreases, the spring 23 resets to pull the angle adjusting rod 83 inward, the sliding shaft 20 resets along the spiral groove 21, the angle of the stirring blade 82 decreases, the stirring contact area increases, and the stirring efficiency is improved. The circular truncated cone-shaped pull block 24 guides the soil to flow smoothly without obstruction and accumulation during rotation. At the same time, when the outer sleeve 11 rotates, the auxiliary sleeve 25 cooperates with the one-way bearing 28 on the short rod 27 and the friction spiral groove 29, the spiral rubber layer 30 continuously presses the one-way bearing 28, the auxiliary sleeve 25 is tightly attached to the inner wall of the pile hole, the one-way bearing 28 limits the reverse rotation of the auxiliary sleeve 25, avoids disturbing the stable hole wall, and the auxiliary sleeve 25 can control the axial length exposed to the outer sleeve 11 according to the hardness of the sand ground. The softer the sand ground, the longer the auxiliary sleeve 25 is exposed, which can provide longer protection for the outer wall of the sand ground pile hole. The harder the sand ground, the shorter the auxiliary sleeve 25 is exposed, which can appropriately reduce the protection time of the outer wall of the sand ground pile hole to avoid excessive torque of the stirring shaft 6. The sawtooth groove 31 at the bottom of the auxiliary sleeve 25 cuts into the bottom and surrounding sand ground of the hole wall, which not only compacts the loose soil through the sawtooth engagement, but also cuts the clumped sand ground to break the soil aggregation structure, facilitating the mixing of the soil and the curing agent by the stirring blade 8. Through the precise connection and cooperative matching of various technical features, the device not only effectively prevents the collapse of the side wall of the sand ground pile hole, but also reasonably controls the torque of the stirring shaft 6, significantly improving the pile quality and construction efficiency.

[0050] In the description of the present application, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inner", "front", "central", "both ends" and the like indicate the orientation or positional relationship based on the orientation or positional relationship of the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0051] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "setting", "connecting", "fixing", "screwing" and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integrated; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship of two elements, unless otherwise explicitly limited, the person skilled in the art can understand the specific meaning of the above-mentioned terms in the present application according to the specific circumstances.

[0052] Although embodiments of the present application have been shown and described, it would be appreciated by those skilled in the art that changes can be made to these embodiments without departing from the principles and spirit of the application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A cement mixing pile drilling rig for sandy land construction, comprising a base (1), an anchor drilling rig frame (2) mounted on the base (1), and an anchor rotary drilling system (3) mounted on the anchor drilling rig frame (2), the anchor rotary drilling system (3) comprising a rotary head (33), the rotary head (33) being slidably mounted on the anchor drilling rig frame (2), characterized in that: The output end of the rotary (33) is connected to a stirring shaft (6), a fixing plate (4) is fixed at the bottom of the rotary (33) housing, a drill bit (7) is fixed at the bottom of the stirring shaft (6), and multiple sets of stirring blades (8) are provided on the outer wall of the stirring shaft (6). The bottom end face of the fixed plate (4) is provided with a base cylinder (5). The stirring shaft (6) is coaxially arranged with the base cylinder (5) and rotatably arranged inside the base cylinder (5). A rotating sleeve (9) is coaxially rotatably arranged inside the base cylinder (5). The bottom end of the rotating sleeve (9) extends downward to the outside of the base cylinder (5). Multiple sets of fixing rods (10) are fixed to the bottom of the outer peripheral wall of the rotating sleeve (9), and an outer sheath (11) is coaxially fixed through the fixing rods (10). The outer sheath (11) surrounds and covers the stirring blade (8) on the inner side. A gap is formed between the rotating sleeve (9) and the stirring shaft (6). An extension rod (12) is fixed at the bottom of the base cylinder (5) within the gap. A linkage gear (13) is rotatably provided at the bottom end of the extension rod (12). An outer ring tooth (14) that meshes with the linkage gear (13) is provided on the outer wall of the stirring shaft (6). An inner ring tooth (15) that meshes with the linkage gear (13) is provided on the inner wall of the rotating sleeve (9). The teeth of the inner ring tooth (15) are elongated. A reciprocating structure is provided inside the base cylinder (5) to drive the rotating sleeve (9) to slide up and down. The reciprocating structure causes the rotating sleeve (9) to move axially when it rotates.

2. The cement mixing pile drilling rig for sandy land construction according to claim 1, characterized in that: The extension rods (12) are symmetrically arranged on both sides of the stirring shaft (6). The bottom ends of the extension rods (12) on both sides are rotatably equipped with linkage gears (13). The inner side of the linkage gears (13) meshes with the inner ring gears (15), and the outer side meshes with the outer ring gears (14).

3. The cement mixing pile drilling rig for sandy land construction according to claim 1, characterized in that: The reciprocating structure includes a reciprocating spiral groove (17) and a guide shaft (18). The base cylinder (5) has an annular groove (16) inside. The rotating sleeve (9) is rotatably disposed in the annular groove (16) and is axially slidably disposed in the annular groove (16). The reciprocating spiral groove (17) is disposed on the inner wall of the base cylinder (5) located in the annular groove (16). The guide shaft (18) is fixed on the inner wall of the rotating sleeve (9) and one end is inserted into the reciprocating spiral groove (17). One end of the guide shaft (18) is slidably connected to the reciprocating spiral groove (17).

4. A cement mixing pile drilling rig for sandy land construction according to claim 1, characterized in that: The stirring blade (8) includes a base rod (81), a stirring blade (82), and a driving angle adjustment rod (83). One end of the base rod (81) is fixed to the stirring shaft (6), and the free end extends outward. The stirring blade (82) is rotatably sleeved on the base rod (81). The angle adjustment rod (83) is slidably disposed inside the base rod (81) along the axial direction of the base rod (81). A sliding shaft (20) is provided on the outer wall of the base rod (81). A spiral groove (21) is provided on the inner wall of the stirring blade (82). The sliding shaft (20) passes through the base rod (81) and extends into the spiral groove (21). The free end of the sliding shaft (20) is slidably connected to the spiral groove (21). A sliding groove (22) is provided on the base rod (81) for the sliding shaft (20) to slide. A tension member is provided inside the base rod (81) to apply an inward pulling force to the angle adjustment rod (83).

5. A cement mixing pile drilling rig for sandy land construction according to claim 4, characterized in that: The base rod (81) is provided with a rod groove (19) for the angle adjustment rod (83) to slide. The tensioning element is a spring (23). One end of the spring (23) is fixed to the inner end of the rod groove (19), and the other end is fixedly connected to the angle adjustment rod (83). The end of the angle adjustment rod (83) located outside the base rod (81) is provided with a pull block (24).

6. A cement mixing pile drilling rig for sandy land construction according to claim 5, characterized in that: The pull block (24) is a frustum-shaped structure that gradually tilts outward from the end near the angle adjustment rod (83) to the end away from the angle adjustment rod (83).

7. A cement mixing pile drilling rig for sandy land construction according to claim 1, characterized in that: The outer sheath (11) is provided with an auxiliary sheath (25). The outer sheath (11) is provided with a sheath groove (26) for the auxiliary sheath (25) to rotate coaxially and slide axially. The outer wall of the auxiliary sheath (25) is provided with a short rod (27). A one-way bearing (28) is sleeved on the short rod (27). The inner wall of the outer sheath (11) is provided with a friction spiral groove (29) for the one-way bearing (28) to slide. The inner wall of the friction spiral groove (29) is provided with a pressure boosting component for applying pressure to the one-way bearing (28).

8. A cement mixing pile drilling rig for sandy land construction according to claim 7, characterized in that: The pressurizing component is a spiral rubber layer (30) disposed in the friction spiral groove (29). The spiral rubber layer (30) is disposed on the inner wall of the friction spiral groove (29) along the spiral direction of the friction spiral groove (29), and the spiral rubber layer (30) gradually thickens from the lower end to the upper end.

9. A cement mixing pile drilling rig for sandy land construction according to claim 8, characterized in that: The auxiliary sleeve (25) has multiple sets of short shafts and one-way bearings (28) on the short shafts, which are evenly arranged in the friction spiral groove (29) along the spiral direction.

10. A cement mixing pile drilling rig for sandy land construction according to claim 7, characterized in that: The auxiliary sheath (25) has serrated grooves (31) evenly distributed on the bottom periphery.

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