While-drilling hydraulic power type low-clearance cement mixing pile forming equipment

Abstract

The utility model discloses while-drilling hydraulic power type low-clearance cement mixing pile forming equipment. The while-drilling hydraulic power type low-clearance cement mixing pile forming equipment comprises a hydraulic power motor, a telescopic drill rod system, a cement pile mixing head, a rack bearing system, a flexible pipeline integration system, a high-pressure oil pump conveying system and a cement grout mixing conveying system. In the stirring pile drilling process, the rotary stirring process only occurs in a stirring head area, a stirring pile drill rod and an upper structure are basically kept in a relatively static state, the drill rod only performs vertical telescopic motion, the stability and safety of stirring pile equipment in the working process are relatively better, and stirring head drilling and stirring are more stable; due to the fact that the hydraulic drive type telescopic drill rod is adopted, the height of the pile machine is relatively smaller, the requirement for foundation reinforcement of places with limited space such as low clearance can be met, and the overall stirring pile construction efficiency is higher.

Description

Technical Field

[0001] The utility model relates to the field of foundation reinforcement treatment, in particular to a drilling-while hydraulic power type low-headroom cement mixing pile forming device. Background Art

[0002] With the large-scale development of infrastructure construction in my country, the reinforcement of soft soil foundation has become one of the main difficulties in engineering construction. For soft soil foundation, CFG piles, screw piles, cement mixing piles, prefabricated piles and high-pressure rotary jet piles are currently used to form a composite foundation with soil between piles to improve the bearing capacity of the foundation. Among them, cement mixing piles are one of the commonly used foundation treatment methods in railway roadbed projects because of their advantages such as simple construction machinery, fast construction speed, high pile efficiency and low cost. Since the promotion and application of cement mixing piles in China, through continuous research on its reinforcement mechanism and continuous improvement of the spraying and mixing process, its effective reinforcement depth and pile quality have been gradually improved. However, compared with its cement soil mixing process, the control of the construction quality of mixing piles is relatively difficult. At the same time, cement mixing piles are hidden projects that are not easy to monitor, and are greatly affected by factors such as site geological conditions, construction conditions, mixing equipment, and personnel quality during construction.

[0003] At present, most domestic cement mixing piles use domestic light mixing machines, and the power source is set on the surface or at the top of the drill rod. Due to the height of the frame and the power of the power source, the depth of the mixing pile foundation reinforcement generally does not exceed 20m. During the construction of mixing piles, due to the upper power source, the drill rod should have higher rigidity to transmit the rotational torque and control the stability of the drill bit. The drill rod needs to overcome the friction between the drill rod and the surrounding soil, resulting in a large loss of efficiency. When the stratum is hard, the mixing depth is deep, and the rigidity of the drill rod is relatively insufficient, the drill bit is prone to horizontal swing, resulting in the failure of the mixing pile. In addition, the frame of the cement mixing pile is relatively large, which makes it difficult to meet the foundation reinforcement needs of low-clearance places (under bridges, foundation pits, contact network interference, etc.), and the current connecting rod scheme has a significant effect on reducing the efficiency of mixing pile construction.

[0004] Therefore, in view of the application limitations of mixing pile construction equipment in scenarios such as low clearance and hard strata, it is necessary to develop a fully hydraulically driven, retractable drill rod cement mixing pile forming device with a power source placed below. While meeting the construction requirements of a fixed clearance environment, it can reduce energy loss, improve the stability of the drill rod, increase construction efficiency, and be able to meet the requirements of mixing pile foundation reinforcement projects in more engineering application scenarios. Utility Model Content

[0005] In order to solve the problems raised in the prior art, the utility model provides a hydraulic powered low-headroom cement mixing pile forming equipment with simple structure, relatively smaller pile driver height, convenient construction, efficient force transmission and high functional integration.

[0006] To this end, the utility model adopts the following technical solutions:

[0007] A hydraulic powered low-headroom cement mixing pile forming equipment for drilling, comprising a hydraulic power motor, a telescopic drill rod system, a cement pile mixing head, a frame bearing system, a flexible pipeline integration system, a high-pressure oil pump delivery system and a cement slurry mixing delivery system; wherein:

[0008] The input end of the hydraulic power motor is fixedly connected to the telescopic drill rod system, and the output end is fixedly connected to the cement pile mixing head, and is used to rotate the cement pile mixing head under the drive of hydraulic oil;

[0009] The telescopic drill rod system is used to press the hydraulic power motor and the cement pile mixing head into or out of the foundation soil under the action of hydraulic oil; the telescopic drill rod system includes a first section of drill rod;

[0010] The flexible pipeline integrated system includes a flexible pipeline group, which is used to deliver the hydraulic oil in the high-pressure oil pump delivery system to the hydraulic power motor; and to deliver the cement slurry in the cement slurry mixing delivery system to the cement pile mixing head;

[0011] The cement pile mixing head is used to mix the cement slurry sprayed out by the cement pile with the foundation soil;

[0012] The frame bearing system is used to bear the telescopic drill rod system, the flexible pipeline integration system, the high-pressure oil pump delivery system and the cement slurry mixing delivery system, and to fix the telescopic drill rod system.

[0013] Preferably, the telescopic drill rod system also includes a telescopic variable diameter drill rod and a steering pulley; the telescopic variable diameter drill rod is arranged in the first section of the drill rod; the flexible pipeline group is fixedly connected to the hydraulic power motor after passing through the first section of the drill rod and the telescopic variable diameter drill rod; the steering pulley is used to make the flexible pipeline group face the ground.

[0014] Preferably, the telescopic drill rod system further comprises a drill rod top extension oil delivery port and a drill rod retraction oil delivery port; the drill rod top extension oil delivery port and the drill rod retraction oil delivery port are used to deliver hydraulic oil to the telescopic variable diameter drill rod, so that it can telescope under the drive of the hydraulic oil.

[0015] Preferably, the flexible pipeline group includes a protective layer and a hydraulic power motor oil inlet pipe, a hydraulic power motor oil return pipe and a cement slurry delivery pipe within the protective layer; the hydraulic power motor oil inlet pipe and the hydraulic power motor oil return pipe are connected to the hydraulic power motor to provide power to the hydraulic power motor; the protective layer is used to prevent the pipeline from being scratched and bumped.

[0016] Preferably, the cement pile mixing head includes a hollow transmission shaft, mixing blades, bottom mixing blades, a drill bit and a grouting hole; the mixing blades and the bottom mixing blades are arranged at intervals on the outside of the transmission shaft to mix a mixture of cement slurry and foundation soil; the cement slurry transported to the transmission shaft through a cement slurry delivery pipe is sprayed out through the grouting hole.

[0017] Preferably, the frame supporting system includes a frame pedestal, a drill rod clamp, a support rod, and a support corbel; the support corbel supports the frame pedestal; the frame pedestal is used to carry the telescopic drill rod system, the flexible pipeline integrated system, the high-pressure oil pump delivery system and the cement slurry mixing and delivery system; the drill rod clamp and the support rod are used to fix the first section of drill rod.

[0018] Preferably, the drill rod clamp is used to adjust the clamping force, angle and clamping direction of the first section of drill rod.

[0019] Preferably, the flexible pipeline integrated system further comprises a pipeline storage turntable and a turntable shaft; the turntable shaft rotates under the drive of hydraulic oil; the pipeline storage turntable rotates under the action of the turntable shaft to retract and release the flexible pipeline group.

[0020] Preferably, the high-pressure oil pump delivery system provides hydraulic oil and pressure to the telescopic drill rod system and the flexible pipeline integrated system.

[0021] Compared with the prior art, the utility model has the following beneficial effects:

[0022] 1. The utility model adopts a hydraulic power motor fixed at the bottom end of the drill rod and used as the core power source of the cement mixing pile mixing head, with small torque loss, high work efficiency conversion rate, and more stable drilling and mixing process of the mixing head.

[0023] 2. The utility model adopts a hydraulically driven retractable drill rod, and the height of the pile driver is relatively smaller, which can meet the foundation reinforcement of sites with limited space such as low clearance, and the mixing pile construction efficiency is higher.

[0024] 3. During the drilling process of the mixing pile, the rotary mixing process only occurs in the mixing head area, and the mixing pile drill rod and the upper structure basically remain in a relatively static state (the drill rod only exhibits vertical telescopic movement), and the stability and safety of the mixing pile equipment during operation are relatively better.

[0025] 4. The power mode of the utility model is simpler and more efficient, applicable to many scenarios, has good mixing uniformity, high pile-forming efficiency, huge engineering application prospects, and outstanding cost-effectiveness. It is the key optimization and improvement direction of cement-soil mixing pile construction technology and related methods, and has broad application space and promotion and application value in the construction of transportation projects such as railways, highways, and municipal roads in my country. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a side view of the utility model;

[0027] Figure 2 It is a schematic diagram of the cross-sectional structure inside the first section of the drill pipe in the utility model;

[0028] Figure 3 It is a structural schematic diagram of the position of the cement pile mixing head in the utility model;

[0029] Figure 4 It is a side view of the utility model when the drill rod is extended.

[0030] In the figure:

[0031] 1. Hydraulic power motor 2. Telescopic drill rod system 20. First section of drill rod

[0032] 21. Telescopic variable diameter drill rod 22. Steering pulley 23. Drill rod top extension oil port

[0033] 24. Drill rod retraction oil outlet 3. Cement pile mixing head 30. Transmission shaft

[0034] 31. Mixing blade 32. Bottom mixing blade 33. Blade teeth

[0035] 34. Drill bit 35. Shotcrete hole 4. Rack bearing system

[0036] 40. Frame support 41. Drill rod holder 42. Support rod

[0037] 43. Support bracket 5. Flexible pipeline integrated system 50. Flexible pipeline group

[0038] 51. Pipe storage turntable 52. Turntable shaft 53. Hydraulic power motor oil inlet pipe

[0039] 54. Hydraulic power motor oil return pipe 55. Cement slurry delivery pipe 6. High-pressure oil pump delivery system

[0040] 60. High-pressure oil pump 61. Drill pipe hydraulic oil pipeline group 62. Drill pipe top extension oil pipeline

[0041] 63. Drill rod retraction oil pipeline 64. Motor hydraulic oil pipeline group 65. Drive motor oil inlet pipe

[0042] 66. Drive motor oil return pipe 7. Cement slurry mixing and conveying system 70. Cement slurry mixing barrel

[0043] 71. Air compression pump 72. Cement slurry pipe DETAILED DESCRIPTION

[0044] The technical solution of the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0045] like Figure 1-Figure 4 As shown, the hydraulic power type low-headroom cement mixing pile forming equipment of the utility model comprises: a hydraulic power motor 1, a telescopic drill rod system 2, a cement pile mixing head 3, a frame bearing system 4, a flexible pipeline integration system 5, a high-pressure oil pump delivery system 6, and a cement slurry mixing delivery system 7;

[0046] The hydraulic power motor 1 is a fully hydraulically driven rotary through-type motor with a rotation speed of 3 to 300 rpm, a maximum torque of 5.6 kN*m / bar, and a weight not exceeding 200 kg. Its input end is fixedly connected to the telescopic drill rod system 2, and its output end is fixedly connected to the cement pile mixing head 3;

[0047] The telescopic drill rod system 2 includes a first section drill rod 20, a telescopic variable diameter drill rod 21, a steering pulley 22, a drill rod top extension oil delivery port 23 and a drill rod retraction oil delivery port 24; the first section drill rod 20 and the telescopic variable diameter drill rod 21 continuously telescope under the drive of hydraulic oil;

[0048] The first section of the drill rod 20 is a hollow structure, a telescopic variable diameter drill rod 21 is arranged inside the first section of the drill rod, and a steering pulley is arranged at the top end thereof.

[0049] The drill rod extension oil delivery port 23 and the drill rod retraction oil delivery port 24 are arranged on the side surface of the first section of the drill rod 20;

[0050] The first section of the drill rod 20 has an outer diameter of 20 cm, a wall thickness of 1 cm, and a height of 3.0 m. The telescopic variable-diameter drill rod 21 is sequentially sleeved and sealed, and an extension and retraction hydraulic oil device is arranged inside. The wall thickness is 1 cm. The hydraulic power motor 1 is fixed to the bottom end of the telescopic variable-diameter drill rod 21, and the hydraulic oil pipeline and the cement slurry pipeline are kept connected in the correct position; the first section of the drill rod 20 and the telescopic variable-diameter drill rod 21 only undergo telescopic movement during the construction of the mixing pile, and no rotational movement is generated.

[0051] The cement pile mixing head 3 includes: a transmission shaft 30, a mixing blade 31, a bottom mixing blade 32, blade teeth 33, a drill bit 34 and a grouting hole 35; the top end of the hollow transmission shaft 30 is connected to the output end of the hydraulic power motor 1, and the grouting hole 35 is connected to the bottom end of the transmission shaft 30.

[0052] A plurality of groups of stirring blades 31 are arranged at equal intervals on the outside of the transmission shaft 30; the stirring blades 31 are arranged in three layers, and are cylindrical or distorted rectangular; the bottom stirring blades 32 and the drill bit 34 are arranged at the bottom end of the transmission shaft 30 and are parallel to the stirring blades 31; the blade teeth 33 are arranged on the bottom stirring blades 32 for cutting foundation soil;

[0053] The frame bearing system 4 is used to bear the telescopic drill rod system 2, the flexible pipeline integrated system 5, the high-pressure oil pump delivery system 6 and the cement slurry mixing delivery system 7. The frame bearing system 4 includes: a frame support 40, a drill rod clamp 41, a support rod 42 and a support bracket 43;

[0054] The support rod 42 and the drill rod clamp 41 are used to fix the first section of the drill rod 20; the drill rod clamp 41 has the function of adjusting the clamping force, angle and clamping direction. The support rod 42 is connected and fixed to the first section of the drill rod 20 and the frame base 40 in a hinged manner. The frame bearing system 4 can be additionally equipped with an automatic walking support system to improve the movement and positioning capabilities of the frame bearing system 4.

[0055] The flexible pipeline integrated system 5 is used to transport hydraulic oil and cement slurry to corresponding positions, and includes: a flexible pipeline group 50, a pipeline receiving turntable 51 and a turntable shaft 52.

[0056] The flexible pipeline group 50 includes a protective layer and a hydraulic power motor oil inlet pipe 53, a hydraulic power motor oil return pipe 54 and a cement slurry delivery pipe 55 in the protective layer. The protective layer is made of flexible heat-insulating material to prevent the pipeline from being scratched and bumped.

[0057] One end of the flexible pipeline group 50 passes through the first section of the drill pipe 20 and is connected to the hydraulic power motor 1, and the other end is turned to the pipeline storage turntable 51 for storage and release through the steering pulley 22. The storage and release speed matches the drilling or lifting speed of the cement pile mixing head 3; the flexible pipeline group 50 realizes the connection and conversion of the hydraulic oil inlet and return pipes and the cement slurry pipe through the turntable shaft 52.

[0058] The hydraulic power motor oil inlet pipe 53 and the hydraulic power motor oil return pipe 54 are both connected to the hydraulic power motor 1 , and the output rotational torque is applied to the transmission shaft 30 , and drives the cement pile mixing head 3 to rotate.

[0059] The inner diameters of the hydraulic power motor oil inlet pipe 53, the hydraulic power motor oil return pipe 54 and the cement slurry delivery pipe 55 are all 2.0 cm. The hydraulic oil pipe has adopted a steel wire high-pressure pipe, and the cement slurry pipe can adopt a PVC pipe. The cement slurry delivered to the drive shaft (30) by the cement slurry delivery pipe 55 is sprayed out through the spray hole 35.

[0060] The high-pressure oil pump delivery system 6 includes: a high-pressure oil pump 60 , a drill pipe hydraulic oil pipeline group 61 , and a motor hydraulic oil pipeline group 64 .

[0061] The drill pipe hydraulic oil pipeline group 61 includes a drill pipe extension oil pipeline 62 and a drill pipe retraction oil pipeline 63 .

[0062] The motor hydraulic oil pipeline group 64 includes a drive motor oil inlet pipe 65 and a drive motor oil return pipe 66 .

[0063] The oil supply pressure range of the high-pressure oil pump 60 is 0-350 bar. The high-pressure oil pump 60 drives the telescopic variable-diameter drill rod 21 to extend and retract through the drill rod hydraulic oil pipeline group 61, and also drives the hydraulic power motor 1 to rotate through the motor hydraulic oil pipeline group 64; the drill rod top extension oil pipeline 62 is connected to the drill rod top extension oil delivery port 23; the drill rod retraction oil pipeline 63 is connected to the drill rod retraction oil delivery port 24; the drive motor oil inlet pipe 65 is connected to the hydraulic power motor oil inlet pipe 53; the drive motor oil return pipe 66 is connected to the hydraulic power motor oil return pipe 54.

[0064] The cement slurry mixing and conveying system 7 comprises: a cement slurry mixing barrel 70, an air compression pump 71, and a cement slurry pipe 72;

[0065] The air compression pump 71 extracts cement from the cement slurry mixing barrel 70 and transports it to the cement slurry delivery pipe 55 through the cement slurry pipe 72. The cement slurry mixing barrel 70 is preferably equipped with an automatic mixing device, and the cement slurry pipe 72 also can be injected with high-pressure air.

[0066] The working process of the utility model is as follows:

[0067] like Figure 4 As shown,

[0068] First, level the site and stake out the mixing pile foundation, and move the cement mixing pile forming equipment to the mixing pile construction location;

[0069] Secondly, mix cement slurry according to the design parameters of the mixing pile, debug the high-pressure oil pump delivery system 6 and the cement slurry mixing and delivery system 7, ensure that the pipeline is leak-free, and the cement slurry is smoothly sprayed out from the spray hole 35 on the cement pile mixing head 3;

[0070] Afterwards, adjust the hydraulic oil pressure output by the high-pressure oil pump 60, adjust the hydraulic oil pressure of the hydraulic power motor oil inlet pipe 65 and the hydraulic power motor oil return pipe 66, and adjust the speed and torque of the hydraulic power motor; adjust the hydraulic oil pressure of the drill rod top extension oil pipeline 62, and the top telescopic variable diameter drill rod 21 begins to extend, so that the cement pile mixing head 3 slowly drills into the foundation soil; in this process, keep the flexible pipeline group 50 synchronously released from the pipeline storage turntable 51;

[0071] Then, the air compression pump 71 is started, and the pressurized cement slurry is delivered to the grouting hole 35 through the cement slurry delivery pipe 55, and the cement pile mixing head 3 cuts the foundation soil, mixes the cement slurry and the foundation soil, and forms a continuous mixed cement soil from top to bottom until the designed pile length;

[0072] Then, adjust the pressure of the hydraulic oil in the oil pipe 63 for retracting the top of the drill pipe, retract the telescopic variable-diameter drill pipe 21 in layers, so that the cement pile mixing head 3 is lifted upward. During the drill bit lifting process, keep the drill bit rotating, stop the grouting, and keep the flexible pipeline group synchronously recovered;

[0073] Finally, the above-mentioned cement pile mixing head 3 drilling, mixing and grouting process is repeated until the mixing effect of the cement mixing pile body reaches the design requirement, the mixing pile foundation is shifted, and the next mixing pile body is constructed.

Claims

1. A hydraulic powered low headroom cement mixing pile forming equipment while drilling, characterized in that: It comprises a hydraulic power motor (1), a telescopic drill rod system (2), a cement pile mixing head (3), a frame bearing system (4), a flexible pipeline integration system (5), a high-pressure oil pump delivery system (6) and a cement slurry mixing and delivery system (7); wherein: The input end of the hydraulic power motor (1) is fixedly connected to the telescopic drill rod system (2), and the output end is fixedly connected to the cement pile mixing head (3), and is used to rotate the cement pile mixing head (3) under the drive of hydraulic oil; The telescopic drill rod system (2) is used to press the hydraulic power motor (1) and the cement pile mixing head (3) into or out of the foundation soil under the action of hydraulic oil; the telescopic drill rod system (2) comprises a first section of drill rod (20); The flexible pipeline integrated system (5) comprises a flexible pipeline group (50) for conveying the hydraulic oil in the high-pressure oil pump conveying system (6) to the hydraulic power motor (1); and conveying the cement slurry in the cement slurry mixing and conveying system (7) to the cement pile mixing head (3); The cement pile mixing head (3) is used to mix the cement slurry sprayed out by the cement pile with the foundation soil; The frame bearing system (4) is used to bear the telescopic drill rod system (2), the flexible pipeline integration system (5), the high-pressure oil pump delivery system (6) and the cement slurry stirring delivery system (7), and to fix the telescopic drill rod system (2).

2. The hydraulic powered low-headroom cement mixing pile forming equipment while drilling according to claim 1 is characterized by: The telescopic drill rod system (2) further comprises a telescopic variable diameter drill rod (21) and a steering pulley (22); the telescopic variable diameter drill rod (21) is arranged in the first section of the drill rod (20); the flexible pipeline group (50) passes through the first section of the drill rod (20) and the telescopic variable diameter drill rod (21) and is fixedly connected to the hydraulic power motor (1); the steering pulley (22) is used to direct the flexible pipeline group (50) toward the ground.

3. The hydraulic powered low-headroom cement mixing pile forming equipment while drilling according to claim 2 is characterized by: The telescopic drill rod system (2) further comprises a drill rod top extension oil delivery port (23) and a drill rod retraction oil delivery port (24); the drill rod top extension oil delivery port (23) and the drill rod retraction oil delivery port (24) are used to deliver hydraulic oil to the telescopic variable diameter drill rod (21), so that the drill rod (21) can move telescopically under the drive of the hydraulic oil.

4. The hydraulic powered low-headroom cement mixing pile forming equipment while drilling according to claim 1 is characterized by: The flexible pipeline group (50) comprises a protective layer and a hydraulic power motor oil inlet pipe (53), a hydraulic power motor oil return pipe (54) and a cement slurry delivery pipe (55) inside the protective layer; the hydraulic power motor oil inlet pipe (53) and the hydraulic power motor oil return pipe (54) are connected to the hydraulic power motor (1) to provide power to the hydraulic power motor (1); the protective layer is used to prevent the pipeline from being scratched or bumped.

5. The hydraulic powered low-headroom cement mixing pile forming equipment while drilling according to claim 4 is characterized by: The cement pile mixing head (3) comprises a hollow transmission shaft (30), a mixing blade (31), a bottom mixing blade (32), a drill bit (34) and a grouting hole (35); the mixing blade (31) and the bottom mixing blade (32) are arranged at intervals outside the transmission shaft (30) and are used to mix a mixture of cement slurry and foundation soil; the cement slurry transported to the transmission shaft (30) through a cement slurry transport pipe (55) is sprayed out through the grouting hole (35).

6. The hydraulic powered low-headroom cement mixing pile forming equipment while drilling according to claim 1 is characterized by: The frame support system (4) comprises a frame support platform (40), a drill rod clamp (41), a support rod (42), and a support bracket (43); the support bracket (43) supports the frame support platform (40); the frame support platform (40) is used to support the telescopic drill rod system (2), the flexible pipeline integration system (5), the high-pressure oil pump delivery system (6) and the cement slurry mixing delivery system (7); the drill rod clamp (41) and the support rod (42) are used to fix the first section of the drill rod (20).

7. The drilling hydraulic power low headroom cement mixing pile forming equipment according to claim 6 is characterized by: The drill rod clamp (41) is used to adjust the clamping force, angle and clamping direction of the first section of the drill rod (20).

8. The hydraulic powered low-headroom cement mixing pile forming equipment while drilling according to claim 1 is characterized by: The flexible pipeline integrated system (5) further comprises a pipeline storage turntable (51) and a turntable shaft (52); the turntable shaft (52) rotates under the drive of hydraulic oil; and the pipeline storage turntable (51) rotates under the action of the turntable shaft (52) to store and release the flexible pipeline group (50).

9. The hydraulic powered low-headroom cement mixing pile forming equipment while drilling according to claim 1, characterized in that: The high-pressure oil pump delivery system (6) provides hydraulic oil and pressure to the telescopic drill rod system (2) and the flexible pipeline integrated system (5).

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