Two-axis bidirectional stirring drilling rig with adjustable distance and construction method

Abstract

The present application relates to a kind of adjustable spacing two-axis bidirectional stirring drilling rig and construction method, including slide, drill rod assembly, drill bit assembly and power head, two identical power head are hung in the lower end of slide, and power head includes power source, box, transmission gear set, variable distance mechanism and output shaft assembly;Variable distance mechanism can change the distance between two power head, and variable distance mechanism is equipped with magnetostrictive displacement sensor, can measure the displacement change amount of piston rod relative to oil cylinder in real time, and the center distance of the output shaft assembly of two power head after variable distance can be locked unchanged;Box lower end output shaft assembly extends respectively drive the inner rod and outer rod of drill rod assembly positive and negative rotation, and the inner rod and outer rod are driven bidirectional rotation stirring of drill bit assembly drill bit again;Using the adjustable spacing two-axis bidirectional stirring drilling rig and construction method of the present application, the spacing in bidirectional stirring pile can be flexibly adjusted, and the construction efficiency of high-quality stirring pile can be greatly improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of engineering machinery, and particularly relates to a two-axis bidirectional stirring drilling rig with adjustable spacing and a construction method. BACKGROUND

[0002] There are two main pile forming methods for cement mixing pile construction drilling rigs: one is single-axis unidirectional stirring pile forming method, and the other is single-axis bidirectional stirring pile forming method. International engineering practice shows that the use of bidirectional stirring pile drilling rig can significantly improve the strength and uniformity of the mixing pile and significantly improve the pile quality. At present, there is no two-axis or variable spacing bidirectional stirring pile drilling rig at home and abroad. The development of the two-axis bidirectional stirring pile drilling rig with adjustable spacing can adapt to various variable pile diameter and variable spacing design schemes, and the drilling rig pile spacing adjustable technology can greatly improve the construction efficiency.

[0003] In the foundation treatment and reinforced core composite pile engineering, the architectural design institute usually designs the cement mixing pile and reinforced core composite pile according to the upper load of the building and the change of the foundation, and different design pile diameters and pile center distances are often used in the design. On the other hand, the architectural design institute pays special attention to the pile forming uniformity and pile strength of the peripheral mixing pile of the cement mixing pile and the reinforced core composite pile, and the controllability and reliability of the construction quality of the cement mixing pile. The construction party pays more attention to the construction period and construction cost. How to solve the above technical problems such as the executability of various design schemes, the shortening of construction period, the reduction of cost and the guarantee of high construction quality is a major technical problem that needs to be solved in the engineering field at present.

[0004] In order to solve the above technical problems, the present application adopts the following technical path:

[0005] 1. In order to improve the construction efficiency of the mixing pile and reduce the construction cost, the double-shaft single-direction mixing pile drilling machine and the double-shaft double-direction mixing pile drilling machine are used. The same construction drilling machine equipment, compared with the single-shaft mixing pile drilling machine, the production efficiency of the double-shaft mixing pile drilling machine can be doubled in the same time. However, the solution has a disadvantage, that is, the fixed double-shaft center distance is used in the production and manufacturing of the mixing pile drilling machine, so the construction interval of the two mixing piles is a fixed value. The mixing pile drilling machine with the fixed double-shaft interval seriously limits the multiple selection of the design scheme in the engineering application, because the construction diameter of the mixing pile and the stiff core composite pile and the interval between the adjacent piles are variables in the ground treatment design, and the variable depends on the load size of the building structure and the change of the underground rock and soil performance. This is the internal reason why the single-shaft mixing pile drilling machine is mainly used in the current construction market. Therefore, the double-shaft mixing pile construction drilling machine solution with adjustable two-shaft center distance is provided, that is, the variable distance mechanism is arranged at the power head of the drilling machine to adjust the center distance of the adjacent two mixing piles required by the design. The two-shaft center distance adjustment can be of any size, and it also does not hinder the selection of the mixing pile diameter size. The design concept can be used for the two-shaft single-direction mixing pile drilling machine and the two-shaft double-direction mixing pile drilling machine.

[0006] 2. The single-direction mixing pile construction drilling machine is the main construction equipment in the current cement mixing pile engineering market, and the single-direction mixing pile construction method has been the mainstream in the mixing pile construction market for a long time. The drilling machine type with more than 60 years of history has been unable to avoid the following disadvantages in long-term application: ① uneven mixing of the pile body solidified soil and large dispersion of the pile strength; ② frequent occurrence of the problems of the stuck drilling and the cement slurry surface spewing during the construction process; ③ difficulty in the construction of the mixing pile with large diameter, large depth and hard soil layer; ④ low construction efficiency of the mixing pile and large cement consumption; and ⑤ poor controllability and reliability of the mixing pile construction quality. Therefore, the double-direction mixing pile drilling machine solution is provided on the basis of the variable distance mechanism, and the multi-layer double-direction mutual shearing mixing construction method, referred to as the CS-DSM (Contra rotational shear–deep soil mixing) method, is provided based on the two-shaft double-direction mixing drilling machine with adjustable interval. The application of the CS-DSM method can realize the beneficial effects of the uniformity enhancement of the double-direction mixing pile and the reduction of the dispersion of the pile strength by using the forward and reverse rotation of the drilling tool and the double-direction shearing mixing function of the multi-layer mixing wing plate of the drilling head. The problems of the stuck drilling and the surface spewing of the cement slurry can be solved, the use amount of the solidified agent can be reduced, and the construction of the mixing pile with large diameter, large depth and hard soil layer becomes possible. Under the same stratum, the same pile length and the same pile diameter, the construction time can be reduced by 30-40%, the controllability and reliability of the mixing pile construction can be improved, and finally the construction cost of the mixing pile engineering can be reduced by 10-15%. SUMMARY

[0007] The present application aims at overcoming the deficiencies in the prior art, and provides a two-axis bidirectional stirring drilling rig with adjustable spacing and a construction method, which can overcome the many disadvantages of the prior art single-direction stirring pile construction technology and the two-axis stirring pile drilling rig with fixed spacing, and innovates a two-axis bidirectional stirring pile drilling rig and a multi-layer bidirectional mutual shearing stirring pile construction method.

[0008] The present application aims at overcoming the deficiencies in the prior art, and provides a two-axis bidirectional stirring drilling rig with adjustable spacing and a construction method, which can overcome the many disadvantages of the prior art single-direction stirring pile construction technology and the two-axis stirring pile drilling rig with fixed spacing, and innovates a two-axis bidirectional stirring pile drilling rig and a multi-layer bidirectional mutual shearing stirring pile construction method.

[0009] The present application has the beneficial effects that: the lower end of the sliding frame suspends two identical power heads, each of which is provided with symmetrical variable distance mechanisms, the variable distance mechanisms can change the distance of the power head relative to the middle partition plate of the sliding frame, realize stepless variable distance, and thus the center distance of the two bidirectional stirring piles can be adjusted according to the engineering design; the inner shaft of the output shaft assembly and the inner rod of the drill rod assembly are provided with at least one communicated circular cross-section slurry pipeline, which can realize multi-channel slurry communication and reliable slurry communication.

[0010] As preferred, the two sides of the intermediate partition plate are respectively provided with the variable distance mechanism, and each of the power heads is provided with two symmetrically distributed variable distance mechanisms; the variable distance mechanism comprises an oil cylinder, a piston rod and a magnetostrictive displacement sensor, the oil cylinder is fixedly connected with the box body of the power head, one end of the piston rod is slidably connected with one end of the oil cylinder, the other end of the piston rod is bolted with the intermediate partition plate of the sliding frame, the magnetostrictive displacement sensor is threadedly connected with the other end of the oil cylinder and is sealingly fixed, and is arranged in the cavity between the oil cylinder and the piston rod; through the above structure, the variable distance mechanism can change the distance between the power head and the intermediate partition plate of the sliding frame, realize stepless variable distance, and thus the center distance between the two bidirectional mixing piles can be adjusted according to the engineering design; and the variable distance mechanism is provided with the magnetostrictive displacement sensor, the displacement change amount of the piston rod relative to the oil cylinder can be conveniently detected, the displacement signal can be transmitted to the visual interface of the host driver's cabin, and thus the operator can know whether the center distance of the output shaft assemblies of the two power heads reaches the design specified mixing pile center distance requirement in real time, and the variable distance mode is flexible, convenient and reliable.

[0011] As preferred, the oil cylinder is provided with an upper oil inlet and a lower oil inlet at two ends, the lower oil inlet of each variable distance mechanism is connected in series through an oil pipe and connected with one oil inlet of the hydraulic pump, and the upper oil inlet of each variable distance mechanism is connected in series through an oil pipe and connected with the other oil inlet of the hydraulic pump; in this way, the piston rods of multiple variable distance mechanisms can be synchronously extended and retracted, so that the two power heads are always symmetrical relative to the intermediate partition plate of the sliding frame, and thus the gravity center position of the entire drilling machine remains unchanged.

[0012] As preferred, the upper end of the oil cylinder is further provided with a threaded hole for mechanical locking, and a screw matched with the threaded hole is arranged; after the variable distance mechanism adjusts the center distance of the two shafts to the right position, the screw matched with the threaded hole is screwed to limit the relative movement of the oil cylinder and the piston rod, thereby improving the reliability of the self-locking of the oil cylinder.

[0013] As preferred, the sliding frame comprises a first side plate, a second side plate and a top plate, the upper ends of the first side plate and the second side plate are fixedly connected with the top plate through bolts, the sliding rail assembly is located at the inner lower ends of the first side plate and the second side plate, and the intermediate partition plate is located above the sliding rail assembly; a vertical sliding block matched with the host mast guide rail is arranged on the outer side of the first side plate or the second side plate; through the above structure, the sliding frame is more convenient to disassemble and assemble, and through the arrangement of the vertical sliding block, the sliding frame and the host mast guide rail can be connected and matched, and the installation is more convenient.

[0014] As preferred, the slide rail assembly comprises slide blocks arranged on both sides of the power head and transverse guide rails arranged inside both side plates of the slide carriage, the slide blocks are matched with the transverse guide rails, and the power head can slide transversely along the transverse guide rails through the slide blocks; both ends of the first side plate and the second side plate are provided with limiting plates, and the limiting plates are located at both ends of the transverse guide rails; through the above structure, the sliding between the power head and the slide carriage is more convenient; meanwhile, through the arrangement of the limiting plates, when the power head and the slide carriage slide, the power head can be prevented from separating from the slide carriage to cause dangerous accidents.

[0015] As preferred, the top plate is provided with a mounting seat, a pulley block is mounted on the mounting seat, and the pulley block is connected with the main machine hoisting steel wire rope; the slide carriage and the power head can be conveniently lifted or lowered.

[0016] As preferred, the intermediate partition plate comprises a vertical plate and two end plates, the two end plates are fixed on both ends of the vertical plate, mounting through holes are arranged on the first side plate and the second side plate matched with the end plates, and the end plates are located in the mounting through holes and are fixed by bolt connection of end plates; through the above structure, the end plates have a limiting and fixing effect on the intermediate partition plate.

[0017] As preferred, the transmission gear set comprises a first drive gear, a second drive gear, an inner shaft gear, an outer shaft gear and a transition gear, the first drive gear and the second drive gear are arranged coaxially and are driven by the power source at the same time, the first drive gear, the transition gear and the inner shaft gear are sequentially meshed to transmit power to the inner shaft, and the second drive gear and the outer shaft gear are meshed to transmit power to the outer shaft; through the above structure, the transmission gear set can realize bidirectional rotation between the inner shaft and the outer shaft.

[0018] A construction method of the two-shaft bidirectional stirring drilling rig with adjustable spacing, for an engineering construction with n sites, the pile spacing of the nth site is X n (n = 1, 2…), and the design pile spacing is between the minimum center distance and the maximum center distance of the output shaft assembly of the two power heads, comprising the following construction steps:

[0019] S1, the drilling rig is positioned, the center distance of the output shaft assembly of the two power heads is adjusted to X1 through the variable distance mechanism, and the variable distance mechanism is locked by screws;

[0020] S2, according to the pile layout position of the first engineering site, piles are sequentially driven to the design depth, and two piles are completed each time;

[0021] S3, the drill rig is shifted, each time moving two pile spacings 2X1, repeating step S2, completing the construction of engineering site 1; if the total number of piles of engineering site 1 is odd, then the last time the drill rig is shifted by one pile spacing X1, so that one pile is repeatedly stirred, the drill bit corresponding to the pile that is repeatedly stirred does not spray grouting, if the total number of piles is even, then the piles are sequentially formed in pairs, this rule is applicable to all engineering sites;

[0022] S4, the drill rig is moved to engineering site 2, the center distance of the output shaft assemblies of the two power heads is adjusted to X2 through the variable distance mechanism, and the variable distance mechanism is locked through the screw, steps S2 and S3 are repeated, and the construction of engineering site 2 is completed.

[0023] S5, steps S2, S3 and S4 are repeated until the construction of engineering site 1 to engineering site n is completed, and the engineering construction is not limited to the order from small to large pile spacing, and the nearest principle can be specifically used.

[0024] The beneficial effects of the present application are that: on the basis of the variable distance mechanism, a two-way stirring pile drill solution capable of implementing multi-layer two-way mutual shearing stirring is added, and a multi-layer two-way mutual shearing stirring pile construction method based on the interval adjustable two-axis two-way stirring drill is proposed, which is referred to as CS-DSM method; by applying the CS-DSM method, the beneficial effects of enhancing the uniformity of the two-way stirring pile and reducing the strength dispersion of the pile body can be achieved by using the forward and reverse rotation of the drilling tool and the multi-layer stirring wing plate two-way shearing stirring function of the drill bit; the problems of sticking and holding of the drill and surface grouting can also be solved, the use amount of the solidifying agent can be reduced, and large-diameter, large-depth and hard soil layer stirring pile construction becomes possible; under the same stratum and same pile length and diameter conditions, the construction time can be reduced by 30-40%, the controllability and reliability of the stirring pile construction can be improved, and finally the construction cost of the stirring pile engineering can be reduced by 10-15%. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a structure schematic diagram of a two-axis two-way stirring drill with adjustable interval of the present application;

[0026] Figure 2 is an explosion structure schematic diagram between the carriage and the power head of a two-axis two-way stirring drill with adjustable interval of the present application;

[0027] Figure 3 is an explosion structure schematic diagram of a carriage assembly of a two-axis two-way stirring drill with adjustable interval of the present application;

[0028] Figure 4 is a power head structure schematic diagram of a two-axis two-way stirring drill with adjustable interval of the present application;

[0029] Figure 5 is a top view structure schematic diagram of two power heads of a two-axis two-way stirring drill with adjustable interval of the present application;

[0030] Figure 6 is a variable distance mechanism cross-sectional structure diagram of a two-axis bidirectional stirring drilling rig with adjustable distance of the present application;

[0031] Figure 7 is a transmission gear set structure diagram of a two-axis bidirectional stirring drilling rig with adjustable distance of the present application;

[0032] Figure 8 is an output shaft assembly cross-sectional structure diagram of a two-axis bidirectional stirring drilling rig with adjustable distance of the present application;

[0033] Figure 9 is a drill pipe assembly cross-sectional structure diagram of a two-axis bidirectional stirring drilling rig with adjustable distance of the present application;

[0034] Figure 10 is a drill bit assembly structure diagram of a two-axis bidirectional stirring drilling rig with adjustable distance of the present application;

[0035] Figure 11 is a drill bit assembly cross-sectional structure diagram of a two-axis bidirectional stirring drilling rig with adjustable distance of the present application;

[0036] Figure 12 is a two-power head drill bit embodiment 1 diagram of a two-axis bidirectional stirring drilling rig with adjustable distance of the present application;

[0037] Figure 13 is a two-power head drill bit embodiment 2 diagram of a two-axis bidirectional stirring drilling rig with adjustable distance of the present application;

[0038] Figure 14 is a construction method corresponding construction diagram of a two-axis bidirectional stirring drilling rig with adjustable distance of the present application;

[0039] Figure 15 is a construction method corresponding variable distance operation cycle construction flowchart of a two-axis bidirectional stirring drilling rig with adjustable distance of the present application;

[0040] 1, power head; 2, slide; 3, drill rod assembly; 4, drill head assembly; 1.1, power source; 1.2, box body; 1.2.1, upper cover; 1.2.2, middle body; 1.2.3, lower cover; 1.3, transmission gear set; 1.4, output shaft assembly; 1.3.1, first drive gear; 1.3.2, second drive gear; 1.3.3, inner shaft gear; 1.3.4, outer shaft gear; 1.3.5, transition gear; 1.4.1, inner shaft; 1.4.2, outer shaft; 1.4.3, upper through-passage; 1.4.4, upper fixed seat; 1.4.5, lower fixed seat; 1.4.6, oil-free bushing; 1.4.7, thrust roller bearing; 1.4.8, pin shaft; 1.4.9, sealing member; 3.1, inner rod; 3.2, outer rod; 3.3, lower through-passage; 3.4, tapered roller bearing; 3.5, snap spring; 4.1, inner drill head; 4.2, outer drill head; 4.1.1, drill head body; 4.1.2, transition shaft; 4.1.3, inner vane shaft; 4.1.4, top shaft; 4.1.5, sealing sleeve; 4.2.1, lower rotary seat; 4.2.2, outer frame vane welded body; 4.2.3, upper rotary seat; 2.1, pulley set; 2.2, top plate; 2.3, first side plate; 2.4, second side plate; 2.5, middle spacer plate; 2.6, sealing plate; 2.7, limiting plate; 2.8, vertical sliding block; 2.9, sliding block; 2.10, horizontal guide rail; 2.11, mounting seat; 2.12, mounting through-hole; 1.5, variable-pitch mechanism; 1.5.1, oil cylinder; 1.5.2, piston rod; 1.5.3, magnetostrictive displacement sensor; 1.5.1.1, upper oil port; 1.5.1.2, lower oil port; 1.5.1.3, threaded hole; 2.5.1, vertical plate; 2.5.2, end plate. DETAILED DESCRIPTION

[0041] The application will be described in detail below with reference to the accompanying drawings: as shown in the drawings Figures 1 to 11As shown, the present application comprises a power head 1, a sliding frame 2, a drill rod assembly 3 composed of an inner rod 3.1 and an outer rod 3.2, a drill bit assembly 4 composed of an inner drill bit 4.1 and an outer drill bit 4.2, characterized in that two power heads 1 are hung on the sliding frame 2, the power head 1 comprises a power source 1.1, a box body 1.2, a transmission gear set 1.3, a variable-pitch mechanism 1.5, an output shaft assembly 1.4 composed of an inner shaft 1.4.1 and an outer shaft 1.4.2, the transmission gear set 1.3 is installed in the box body 1.2 and is powered by the power source 1.1, the transmission gear set 1.3 is connected to the inner shaft 1.4.1 and the outer shaft 1.4.2 of the output shaft assembly 1.4 respectively and realizes bidirectional rotation, the inner shaft 1.4.1 and the outer shaft 1.4.2 extend out of the lower end of the box body 1.2 and drive the inner rod 3.1 and the outer rod 3.2 of the drill rod assembly 3 to rotate bidirectionally respectively, the inner rod 3.1 and the outer rod 3.2 drive the inner drill bit 4.1 and the outer drill bit 4.2 of the drill bit assembly 4 to rotate bidirectionally respectively, at least one through slurry pipeline is installed in the inner shaft 1.4.1 and the inner rod 3.1; a middle partition plate 2.5 is installed between the two side plates of the sliding frame 2, one end of the variable-pitch mechanism 1.5 is connected and fixed with the middle partition plate 2.5, the other end of the variable-pitch mechanism 1.5 is installed on the power head 1, and the two side faces of the power head 1 are slidably connected with the inner sides of the two side plates of the sliding frame 2 through a sliding rail assembly.

[0042] The sliding frame 2 comprises a first side plate 2.3, a second side plate 2.4, a top plate 2.2, a pulley set 2.1, a middle partition plate 2.5, an enclosing plate 2.6 and a limiting plate 2.7; the first side plate 2.3 and the second side plate 2.4 have the same size, the upper ends of the two side plates are bolted with the top plate 2.2, the top plate 2.2 is provided with a mounting seat 2.11, the pulley set 2.1 is mounted on the mounting seat 2.11, and the pulley set 2.1 is connected with the main engine wire rope, thereby facilitating the lifting or lowering of the sliding frame 2 and the power head 1.

[0043] The inner sides of the lower ends of the two side plates are provided with horizontal guide rails 2.10 matched with the sliding blocks 2.9 of the side faces of the power head 1, the power head 1 can slide horizontally along the horizontal guide rails 2.10 and can be completely taken out of or put into the two ends of the horizontal guide rails 2.10.

[0044] The two ends of the guide rails of the first side plate 2.3 and the second side plate 2.4 are bolted with the limiting plate 2.7; the outer side of the first side plate 2.3 is provided with vertical sliding blocks 2.8 matched with the main engine mast guide rails, and the matching mode can adopt a circular sliding rail or a square sliding rail.

[0045] The first side plate 2.3 is provided with a mounting through hole 2.12 between the two vertical sliding blocks 2.8 and at a position corresponding to the second side plate 2.4, the mounting through hole 2.12 is a square through hole, and the two sides of the mounting through hole 2.12 are provided with threaded holes.

[0046] The intermediate partition plate 2.5 is composed of a vertical plate 2.5.1 and two end plates 2.5.2, the vertical plate 2.5.1 is provided with threaded holes at both ends, and the two end plates 2.5.2 are slightly smaller than the mounting through holes 2.12 of the first side plate 2.3 and the second side plate 2.4 in length and width, so that the intermediate partition plate 2.5 can pass through the mounting through holes 2.12 of the first side plate 2.3 and the second side plate 2.4 completely, and the two end plates 2.5.2 are respectively aligned with the outer planes of the first side plate 2.3 and the second side plate 2.4.

[0047] The end plates 2.5.2 of the intermediate partition plate 2.5 are connected with the sealing plates 2.6 through bolts, and the sealing plates 2.6 are connected with the first side plate 2.3 and the second side plate 2.4 through bolts, respectively, and the sealing plates 2.6 have a limiting and fixing effect on the intermediate partition plate 2.5.

[0048] Each power head 1 is provided with two symmetrical variable distance mechanisms 1.5, the variable distance mechanism 1.5 includes a cylinder 1.5.1, a piston rod 1.5.2 and a magnetostrictive displacement sensor 1.5.3, the cylinder 1.5.1 is fixedly connected with the box body of the power head 1, one end of the piston rod 1.5.2 is slidably connected with one end of the cylinder 1.5.1, the other end is bolted with the intermediate partition plate 2.5 of the sliding frame 2, the magnetostrictive displacement sensor 1.5.3 is threadedly connected with the other end of the cylinder 1.5.1 and is sealingly fixed, and is installed in the cavity between the cylinder 1.5.1 and the piston rod 1.5.2. The specific assembly relationship is shown in Figure 5 The magnetostrictive displacement sensor 1.5.3 can detect the displacement change of the piston rod relative to the cylinder in real time.

[0049] The cylinder 1.5.1 is provided with an upper oil inlet 1.5.1.1 and a lower oil inlet 1.5.1.2 at both ends, the lower oil inlets 1.5.1.2 of the four variable distance mechanisms 1.5 are connected in series through oil pipes and connected with one oil port of the hydraulic pump, similarly, the upper oil inlets 1.5.1.1 of the four variable distance mechanisms 1.5 are connected in series through oil pipes and connected with another oil port of the hydraulic pump, so that the piston rods 1.5.2 of the four variable distance mechanisms can be extended and retracted synchronously, thereby ensuring that the two power heads 1 are always symmetrical relative to the intermediate partition plate 2.5 of the sliding frame 2, so that the center of gravity of the entire drilling machine remains unchanged, since the four variable distance mechanisms 1.5 can be extended and retracted synchronously, only one of the variable distance mechanisms 1.5 needs to be installed with a magnetostrictive displacement sensor 1.5.3.

[0050] The hydraulic pump is installed on the main machine chassis, and the hydraulic pump required for controlling the four variable distance mechanisms 1.5 is a double-acting hydraulic pump, that is, it can switch the oil inlet and outlet ports. When the lower oil port 1.5.1.2 is filled with oil, the piston rod 1.5.2 is extended, and when the upper oil port 1.5.1.1 is filled with oil, the piston rod 1.5.2 is retracted. In addition, the hydraulic pump must also have a neutral self-locking function, that is, when the piston rod 1.5.2 stops extending and retracting, it can keep the piston rod 1.5.2 from moving, so that it will not move due to the unbalanced force of the drilling machine in operation.

[0051] The upper end of the oil cylinder 1.5.1 is also provided with a threaded hole 1.5.1.3 for mechanical locking. When the variable distance mechanism 1.5 adjusts the center distance of the two shafts to the right position, a screw matched with the threaded hole 1.5.1.3 is screwed on to limit the relative movement of the oil cylinder 1.5.1 and the piston rod 1.5.2, thereby improving the reliability of the self-locking.

[0052] The signal line of the magnetostrictive displacement sensor 1.5.3 is led to the control cabinet in the main machine cab, and the displacement change amount ΔL of the piston rod 1.5.2 can be read on the visual interface in the cab. The center distance L of the output shaft assembly 1.4 of the two power heads after variable distance n is equal to the sum of the displacement change amount ΔL of the piston rod 1.5.2 and the center distance L of the output shaft assembly of the last variable distance n-1 , that is, L n = ΔL + L n-1 When the piston rod is extended, ΔL is positive, and vice versa.

[0053] The variable distance mechanism 1.5 can change the distance of the power head 1 relative to the middle partition plate 2.5 of the carriage. When the piston rod 1.5.2 is fully retracted, the two power heads 1 are closest, at which time the power head 1 is in contact with the middle partition plate 2.5. When the piston rod 1.5.2 is fully extended, the two power heads 1 slide along the transverse guide rails of the first side plate 2.3 and the second side plate 2.4 until they come into contact with the limiting plate, at which time the two power heads 1 are farthest apart.

[0054] As Figures 12-13 are two typical embodiments of the present application, Figure 12 is embodiment 1 of the present application, at which time the two power heads 1 slide along the transverse guide rails of the two side plates of the carriage 2 to the closest, and the two power heads 1 are in contact with the middle partition plate 2.5, which is the case where the distance between the two output shaft assemblies 1.4 is the smallest.

[0055] Figure 13 is embodiment 2 of the present application, at which time the two power heads 1 slide along the transverse guide rails of the two side plates of the carriage 2 to the farthest, the piston rod 1.5.2 of the variable distance mechanism 1.5 of the power head 1 is fully extended, and the sliding block 2.9 of the power head 1 is in contact with the limiting plate 2.7, which is the case where the distance between the two output shaft assemblies 1.4 is the largest.

[0056] In addition to the embodiment 1 and the embodiment 2, the two power heads 1 of the present application can be infinitely variable between the maximum distance and the minimum distance, which can be arbitrarily adjusted according to the design requirements.

[0057] The box body 1.2 comprises an upper cover 1.2.1, a lower cover 1.2.3 and an intermediate body 1.2.2, the upper cover 1.2.1 and the lower cover 1.2.3 are respectively fixedly connected with the intermediate body 1.2.2 by bolts, the intermediate body 1.2.2 is provided with a partition plate in the middle, and the partition plate divides the box body 1.2 into an upper cavity and a lower cavity; the upper end of the box body upper cover 1.2.1 is provided with a base, and the power source 1.1 is installed on the base, which can be a hydraulic motor or a motor.

[0058] The transmission gear set 1.3 comprises a first drive gear 1.3.1, a second drive gear 1.3.2, a transition gear 1.3.5, an inner shaft gear 1.3.3 and an outer shaft gear 1.3.4, the first drive gear 1.3.1, the transition gear 1.3.5 and the inner shaft gear 1.3.3 are arranged in the upper cavity of the box body 1.2, and the second drive gear 1.3.2 and the outer shaft gear 1.3.4 are arranged in the lower cavity of the box body 1.2; the first drive gear 1.3.1 and the second drive gear 1.3.2 are coaxially arranged above and below, the upper end is connected with the power source 1.1, the power source 1.1 drives the two to rotate synchronously, and the lower end is connected with the lower cover 1.2.3 through the partition plate of the intermediate body 1.2.2; the second drive gear 1.3.2 is engaged with the outer shaft gear 1.3.4, the outer shaft gear 1.3.4 is connected with the outer shaft 1.4.2 of the output shaft assembly 1.4, the first drive gear 1.3.1 is engaged with the transition gear 1.3.5, the transition gear 1.3.5 is engaged with the inner shaft gear 1.3.3, and the inner shaft gear 1.3.3 is connected with the inner shaft 1.4.1 of the output shaft assembly 1.4, wherein the transition gear 1.3.5 plays a reverse role.

[0059] The output shaft assembly 1.4 comprises an inner shaft 1.4.1, an outer shaft 1.4.2, an upper through-pipe 1.4.3, an upper fixed seat 1.4.4, a lower fixed seat 1.4.5, a sealing element 1.4.9, a thrust roller bearing 1.4.7, a pin shaft 1.4.8 and an oil-free bushing 1.4.6.

[0060] The drill rod assembly 3 comprises an inner rod 3.1, a lower through-pipe 3.3, an upper fixed seat 1.4.4, a lower fixed seat 1.4.5, an outer rod 3.2, a tapered roller bearing 3.4, a thrust roller bearing 1.4.7, an oil-free bushing 1.4.6, a clamping spring 3.5 and a sealing element 1.4.9.

[0061] The lower ends of the inner shaft 1.4.1 and the outer shaft 1.4.2 and the inner rod 3.1 and the outer rod 3.2 are respectively provided with the oil-free bushing 1.4.6 and the thrust roller bearing 1.4.7, so as to ensure the coaxial relative rotation of the inner shaft 1.4.1 and the outer shaft 1.4.2 and the inner rod 3.1 and the outer rod 3.2.

[0062] The lower end of the outer shaft 1.4.2 and the inner shaft 1.4.1 is provided with a hexagonal male joint, the upper end of the inner rod 3.1 and the outer rod 3.2 is provided with a hexagonal female joint, the inner shaft 1.4.1 and the inner rod 3.1, the outer shaft 1.4.2 and the outer rod 3.2 are hexagonally inserted, and the outer shaft 1.4.2 and the outer rod 3.2 are fixed by the pin shaft 1.4.8.

[0063] The lower end of the outer shaft 1.4.2 and the outer rod 3.2 is provided with a sealing groove, and the sealing groove is provided with a sealing element 1.4.9, which forms a radial seal with the outer rod 3.2 and the outer drill bit 4.2 when connected with the drill rod assembly 3 and the drill bit assembly 4.

[0064] The upper and lower through slurry pipes 1.4.3 and 3.3 are respectively installed in the through holes of the inner shaft 1.4.1 and the inner rod 3.1, and the number of the two is not less than one and is communicated, the upper end of the upper and lower through slurry pipes 1.4.3 and 3.3 is limited by the upper fixing seat 1.4.4, and the lower end is limited by the lower fixing seat 1.4.5, the upper fixing seat 1.4.4 and the lower fixing seat 1.4.5 are respectively positioned with the upper end and the lower end of the inner shaft 1.4.1 and the inner rod 3.1 by the pin shaft and are fastened by bolts, and the upper end and the lower end of the upper and lower through slurry pipes 1.4.3 and 3.3 are provided with sealing grooves, and the sealing grooves are provided with sealing elements 1.4.9, which are convenient for sealing when inserted.

[0065] Unlike the output shaft assembly 1.4, the upper end of the inner rod 3.1 and the outer rod 3.2 of the drill rod assembly 3 is provided with a tapered roller bearing 3.4, when assembled, the inner rod 3.1, the lower through slurry pipe 3.3, the upper fixing seat 1.4.4 and the lower fixing seat 1.4.5 are assembled first, then the thrust roller bearing 1.4.7 and the oil-free bushing 1.4.6 are installed at the lower end of the inner rod 3.1, then they are inserted into the outer rod 3.2 from the upper end, then the tapered roller bearing 3.4 is installed between the inner rod 3.1 and the outer rod 3.2 at the upper end, and then the snap spring 3.5 is installed in the snap spring groove of the outer rod 3.2 for limiting, so that the drill rod assembly 3 forms an independent module, which is convenient for transportation, disassembly and connection.

[0066] The drill bit assembly 4 includes an inner drill bit 4.1, an outer drill bit 4.2, a tapered roller bearing 3.4, a thrust roller bearing 1.4.7, a sealing element 1.4.9 and a snap spring 3.5. The inner drill bit 4.1 includes a top shaft 4.1.4, an inner blade shaft 4.1.3, a transition shaft 4.1.2, a drill bit body 4.1.1, a sealing sleeve 4.1.5 and a sealing element 1.4.9.

[0067] The inner drill bit 4.1 is provided with at least one grouting channel communicating with the upper grouting pipe 1.4.3 and the lower grouting pipe 3.3. The lower end of the inner drill bit 4.1 is provided with an outlet of the grouting channel. The top shaft 4.4.4, the inner blade shaft 4.4.3, the transition shaft 4.4.2, and the drill bit body 4.4.1 are sequentially hexagonally inserted and fixed by the pin 1.4.8. A sealing sleeve 4.1.5 with a sealing element 1.4.9 is provided at the channel connection to ensure the sealing of the channel.

[0068] The inner blade shaft 4.1.3 has three sets, but not limited to three sets, of inner blades welded in the axial direction. Each set of inner blades has at least two inner blades evenly distributed in the circumferential direction. The inner blades are at a certain angle to the axis of the inner blade shaft. The lower end of the drill bit body 4.1.1 is provided with at least two, but not limited to two, tunneling blades. The angle of the tunneling blades is consistent with the angle of the inner blades on the inner blade shaft 4.1.3.

[0069] The external drill bit 4.2 includes an upper rotating seat 4.2.3, a lower rotating seat 4.2.1, and an outer frame blade welded body 4.2.2.

[0070] The upper rotating seat 4.2.3 is sleeved on the top shaft 4.1.4, with a tapered roller bearing 3.4 installed between them. A retaining ring 3.5 is installed in the retaining ring groove of the top shaft 4.1.4 to limit the tapered roller bearing 3.4. The lower rotating seat 4.2.1 is sleeved on the transition shaft 4.1.2 and the drill body 4.1.1. A tapered roller bearing 3.4 is installed between the lower rotating seat 4.2.1 and the transition shaft 4.1.2, and a thrust roller bearing 1.4.7 is installed between the lower rotating seat 4.2.1 and the drill body 4.1.1. The two tapered roller bearings 3.4 are arranged back to back and can withstand bidirectional axial loads. The thrust roller bearing 1.4.7 can increase the rigidity when lifting the drill.

[0071] The drill bit body 4.1.1, the transition shaft 4.1.2, and the top shaft 4.1.4 are provided with sealing grooves. The sealing grooves are filled with sealing elements 1.4.9. The sealing elements 1.4.9 form a radial seal with the upper rotating seat 4.2.3 and the lower rotating seat 4.2.1. Lubrication channels are provided at the sealing points to facilitate regular lubrication.

[0072] The outer frame blade welded body 4.2.2 has at least two evenly distributed arc-shaped support plates welded in the circumferential direction. The support plates have two, but not limited to two, outer blades welded in the axial direction. The outer blades are at a certain angle to the support plates, and their inclination direction is opposite to that of the inner blades on the inner blade shaft of the drill bit body 4.1.1. The upper and lower ends of the outer frame blade welded body 4.2.2 are respectively fitted onto the upper rotating seat 4.2.3 and the lower rotating seat 4.2.1, and are fixed to the upper rotating seat 4.2.3 and the lower rotating seat 4.2.1 by bolts. This allows the three to rotate synchronously relative to the inner drill bit 4.1.

[0073] The upper end of the top shaft 4.1.4 and the upper end of the upper rotating seat 4.2.3 are provided with hexagonal female joints, which are respectively inserted with the male joints at the lower ends of the inner rod 3.1 and the outer rod 3.2, and the outer rod 3.2 and the upper rotating seat 4.2.3 are fixed by pin shafts.

[0074] Figure 14 and Figure 15 respectively are the construction drawing corresponding to the construction method of the adjustable-distance two-shaft bidirectional stirring drilling rig and the construction flowchart of one distance changing operation cycle, Figure 14 the symbols in the formula satisfy the relationship L min ≤X1≤X2…≤X n ≤L max , wherein L min is the minimum center distance of the two power head output shaft assemblies, and L max is the maximum center distance of the two power head output shaft assemblies, and the specific construction steps of the CS-DMS method are as follows:

[0075] S1, the drilling rig is positioned, the center distance of the two power head output shaft assemblies is adjusted to X1 through the distance changing mechanism, and the distance changing mechanism is locked by screws;

[0076] S2, according to the layout position of the pile in the site 1, piles are sequentially driven to the design depth, and two piles are completed each time;

[0077] S3, the drilling rig is moved, and each time the drilling rig is moved by two pile spacings (2X1), and the step S2 is repeated to complete the construction of the site 1; if the total number of piles in the site 1 is odd, then the drilling rig is moved by one pile spacing (X1) in the last time, so that one pile is repeatedly stirred, the drill bit corresponding to the pile repeatedly stirred does not spray mortar, and if the total number of piles is even, then the piles are sequentially formed in pairs, and this rule is applicable to all sites;

[0078] S4, the drilling rig is moved to the site 2, the center distance of the two power head output shaft assemblies is adjusted to X2 through the distance changing mechanism, and the distance changing mechanism is locked by screws, the steps S2 and S3 are repeated to complete the construction of the site 2;

[0079] S5, the steps S2, S3 and S4 are repeated until the construction of the site 1 to the site n is completed, and the construction is not limited to the order from small to large of the pile spacings, and the nearest principle can be specifically used.

[0080] The present application is not limited to the above-mentioned embodiments, and any changes in shape or material composition are allowed, as long as the structure design provided by the present application is adopted, which is a deformation of the present application and should be considered within the protection scope of the present application.

Claims

1. A two-axis bidirectional adjustable distance stirring drilling machine, comprising a power head (1), a sliding carriage (2), a drill rod assembly (3) composed of an inner rod (3.1) and an outer rod (3.2), a drill bit assembly (4) composed of an inner drill bit (4.1) and an outer drill bit (4.2), two power heads (1) suspended on the sliding carriage (2), the power head (1) comprising a power source (1.1), a box (1.2), a transmission gear set (1.3), a variable distance mechanism (1.5), an output shaft assembly (1.4) composed of an inner shaft (1.4.1) and an outer shaft (1.4.2), the transmission gear set (1.3) being installed in the box (1.2) and powered by the power source (1.1), the transmission gear set (1.3) being connected to the inner shaft (1.4.1) and the outer shaft (1.4.2) of the output shaft assembly (1.4) respectively and achieving bidirectional rotation, the inner shaft (1.4.1) and the outer shaft (1.4.2) extending out of the lower end of the box (1.2) and driving the inner rod (3.1) and the outer rod (3.2) of the drill rod assembly (3) to rotate bidirectionally respectively, the inner rod (3.1) and the outer rod (3.2) driving the inner drill bit (4.1) and the outer drill bit (4.2) of the drill bit assembly (4) to rotate bidirectionally respectively, at least one common slurry pipeline being installed in the inner shaft (1.4.1) and the inner rod (3.1); an intermediate partition plate (2.5) being installed between the two side plates of the sliding carriage (2), one end of the variable distance mechanism (1.5) being connected and fixed with the intermediate partition plate (2.5), the other end of the variable distance mechanism (1.5) being installed on the power head (1), the two side faces of the power head (1) being slidably connected with the inner sides of the two side plates of the sliding carriage (2) through a sliding rail assembly; characterized in that: The construction method of the adjustable-distance two-shaft bidirectional stirring drilling rig, for an engineering construction with n sites, the pile distance of the nth site is X n (n=1, 2…), and the designed pile distance is between the minimum center distance and the maximum center distance of the two power head output shaft assemblies, including the following construction steps: S1. The drilling rig is in place. The center distance between the output shaft assemblies (1.4) of the two power heads (1) is adjusted to X1 through the pitch mechanism (1.5), and the pitch mechanism is locked with screws. S2. Based on the layout of the piles at site 1, drive the piles to the design depth in sequence, completing two piles each time. S3. Drilling rig relocation: move the rig two piles at a distance of 2 x 1 each time, repeat step S2, and complete the construction of site 1. If the total number of piles in site 1 is odd, then the last drilling rig relocation will move the rig one pile at a distance of X 1. This will result in one pile being repeatedly stirred. The drill bit corresponding to the repeatedly stirred pile will not spray grout. If the total number of piles is even, then piles can be formed in pairs. This rule applies to all construction sites. S4. Move the drilling rig to the engineering site 2, adjust the center distance of the output shaft assembly (1.4) of the two power heads (1) to X2 through the pitch mechanism (1.5), and lock the pitch mechanism with screws. Repeat steps S2 and S3 to complete the construction of the engineering site 2. S5. Repeat steps S2, S3 and S4 until the construction of engineering sites 1 to n is completed. The construction is not limited to the order of increasing pile spacing; the principle of proximity can be adopted.

2. The adjustable-spacing bidirectional stirring drill according to claim 1, characterized in that: The pitch-changing mechanism (1.5) is installed on both sides of the intermediate partition (2.5), and each power head (1) is provided with two pitch-changing mechanisms (1.5) symmetrically distributed; the pitch-changing mechanism (1.5) includes a hydraulic cylinder (1.5.1), a piston rod (1.5.2) and a magnetostrictive displacement sensor (1.5.3). The hydraulic cylinder (1.5.1) is fixedly connected to the housing of the power head (1). One end of the piston rod (1.5.2) is slidably connected to one end of the hydraulic cylinder (1.5.1), and the other end is bolted to the intermediate partition (2.5) of the slide (2). The magnetostrictive displacement sensor (1.5.3) is threadedly connected to the other end of the hydraulic cylinder (1.5.1) and sealed and fixed, and is installed in the cavity between the hydraulic cylinder (1.5.1) and the piston rod (1.5.2).

3. The adjustable-spacing bidirectional stirring drill according to claim 2, characterized in that: The cylinder (1.5.1) is provided with an upper oil port (1.5.1.1) and a lower oil port (1.5.1.2) at both ends. The lower oil port (1.5.1.2) of each pitch mechanism (1.5) is connected in series with an oil pipe and connected to one oil port of the hydraulic pump. The upper oil port (1.5.1.1) of each pitch mechanism (1.5) is connected in series with an oil pipe and connected to the other oil port of the hydraulic pump.

4. The adjustable-spacing bidirectional stirring drill according to claim 3, characterized in that: The upper end of the hydraulic cylinder (1.5.1) is also provided with a threaded hole (1.5.1.3) for mechanical locking, and a screw is provided to match the threaded hole (1.5.1.3).

5. The adjustable-spacing bidirectional stirring drill according to claim 1, characterized in that: The carriage (2) includes a first side plate (2.3), a second side plate (2.4) and a top plate (2.2). The upper ends of the first side plate (2.3) and the second side plate (2.4) are fixed to the top plate (2.2) by bolts. The slide rail assembly is located at the lower inner end of the first side plate (2.3) and the second side plate (2.4), and the middle partition plate (2.5) is located above the slide rail assembly. A vertical slider (2.8) matching the main mast guide rail is provided on the outer side of the first side plate (2.3) or the second side plate (2.4).

6. The adjustable-spacing bidirectional stirring drill according to claim 5, characterized in that: The slide rail assembly includes sliders (2.9) disposed on both sides of the power head (1) and transverse guide rails (2.10) disposed on the inner sides of both side plates of the slide frame (2). The sliders (2.9) are adapted to the transverse guide rails (2.10), and the power head (1) can slide laterally along the transverse guide rails (2.10) via the sliders (2.9). Both ends of the first side plate (2.3) and the second side plate (2.4) are provided with limiting plates (2.7), and the limiting plates (2.7) are located at both ends of the transverse guide rails (2.10).

7. The adjustable-spacing bidirectional stirring drill according to claim 5, characterized in that: The top plate (2.2) is provided with a mounting base (2.11), and a pulley block (2.1) is installed on the mounting base (2.11). The pulley block (2.1) is connected to the main hoist wire rope.

8. The adjustable-spacing bidirectional stirring drill according to claim 5, characterized in that: The intermediate partition (2.5) includes a vertical plate (2.5.1) and two end plates (2.5.2). The two end plates (2.5.2) are fixed at both ends of the vertical plate (2.5.1). The first side plate (2.3) and the second side plate (2.4) adapted to the end plate (2.5.2) are both provided with mounting through holes (2.12). The end plate (2.5.2) is located in the mounting through hole (2.12) and is fixed by bolt connection with a sealing plate (2.6).

9. The adjustable-spacing bidirectional stirring drill according to claim 1, characterized in that: The transmission gear set (1.3) includes a first drive gear (1.3.1), a second drive gear (1.3.2), an inner shaft gear (1.3.3), an outer shaft gear (1.3.4), and a transition gear (1.3.5). The first drive gear (1.3.1) and the second drive gear (1.3.2) are arranged coaxially and driven simultaneously by the power source (1.1). The first drive gear (1.3.1), the transition gear (1.3.5), and the inner shaft gear (1.3.3) mesh sequentially to transmit power to the inner shaft (1.4.1). The second drive gear (1.3.2) and the outer shaft gear (1.3.4) mesh to transmit power to the outer shaft (1.4.2).

Images