Multi-channel powder spraying mixing pile drilling machine equipment

Abstract

The utility model relates to the technical field of construction drilling machine equipment, in particular to multi-channel powder spraying mixing pile drilling machine equipment which comprises a drilling machine main body, and the drilling machine main body comprises a drilling rod and a multi-layer mutual shearing mixing drill bit. At least a gas material channel and a gas flow channel are arranged in the drill rod, so that high-pressure gas and curing agent powder can be continuously, uniformly and quantitatively supplied to a gas material pipeline of the drilling machine. Gas-solid two-phase mixed compressed fluid and high-pressure airflow enter a focusing area at the bottom of the multi-layer mutual-shearing stirring drill bit through a gas material channel and an airflow channel of the drilling tool, and the two high-pressure fluids become more uniform after being reflected, mixed and gasified in the focusing area. High-pressure spraying and stirring of a foundation soil body are achieved through stirring blades of the multi-layer mutual-shearing stirring drill bit and nozzles at the far end and the near end, and curing agent powder and undisturbed soil body are fully stirred and mixed to form the large-diameter high-quality powder spraying stirring pile under the staggered-layer shearing stirring effect of the multi-layer mutual-shearing stirring drill bit.

Description

Technical Field

[0001] The utility model relates to the technical field of construction drilling rig equipment of a geotechnical engineering powder injection mixing pile construction method, in particular to multi-channel powder injection mixing pile drilling rig equipment. Background Art

[0002] There are large areas of soft soil in my country, mainly distributed along the coast. In addition, soft soil is also distributed in inland lakes and swamps, such as lake sediments in Dongting Lake, Hongze Lake, Taihu Lake and other areas, as well as riverbank sediments in the middle and lower reaches of major rivers.

[0003] In these areas, soft soil is widely distributed, which poses a huge challenge to engineering construction and road construction technology. For example, in the construction of highways, railways, bridges and other projects, foundation treatment in soft soil areas is a very critical technical link, and technical measures such as foundation reinforcement and drainage consolidation are required to ensure the safety and stability of the project. The powder spraying mixing pile method uses cement or lime and other curing agent powder as reinforcement materials. Through special dry spraying construction machinery and equipment, compressed air is used to spray the powder reinforcement material into the foundation soil in a mist form. With the rotation and stirring of the drill blade, the powder reinforcement material and the in-situ foundation soil are strongly mixed and stirred, forming a pile body with strong integrity, good water stability and high bearing capacity in a short time. The powder spraying pile construction technology is adopted. The powder spraying construction has the advantages of small vibration, no pollution, fast speed, simple construction machinery, high construction efficiency and low engineering cost.

[0004] In view of the construction technology of powder injection pile, a series of one-way mixing powder injection pile construction drilling rigs have been developed at home and abroad. However, the existing drilling rig construction still has the following technical problems that need to be solved urgently:

[0005] 1. The construction requirements of powder injection mixing piles are relatively high and require professional and technical personnel to operate. Since the feeding speed and feeding amount are usually manually controlled by construction personnel, the construction quality is difficult to meet the design requirements, and even pipe blockage and material breakage may occur.

[0006] 2. At present, the diameter of powder injection mixing pile construction is generally 500mm, the length is less than 15m, and large-diameter powder injection mixing pile construction is impossible; when the construction pile diameter and pile length exceed the above indicators, engineering accidents such as insufficient pile diameter and uneven mixing of curing agent are prone to occur during construction.

[0007] 3. Powder injection mixing drill bits usually adopt a one-way mixing drill tool structure similar to wet injection mixing piles. However, this drill bit structure cannot ensure that the curing agent dry powder is fully and evenly mixed in the foundation soil, resulting in poor pile quality.

[0008] 4. Gas-solid mixed two-phase fluid is transported through a conveying pipeline by pneumatic conveying. When the pressure of the high-pressure gas transported in the pipeline is insufficient or the depth of the powder nozzle is subject to excessive underground pressure, pipe blockage and insufficient injection radius are often likely to occur. Utility Model Content

[0009] In view of the characteristics of existing powder injection mixing pile construction equipment and the technical problems it faces, the utility model proposes a multi-channel powder injection mixing pile drilling rig equipment, which uses a multi-layer mutual shear mixing drill bit to perform staggered shear mixing on the solidified soil, and can achieve a uniform mixing effect. At the same time, through the concave focusing structure in the drill bit, the high-pressure airflow and gas-solid two-phase flow are used to produce secondary gasification on the impact reflection of the focused concave surface, which can greatly improve the uniformity of powder injection pile mixing and the strength of the pile body.

[0010] For the purpose of this utility model, the following technical solutions are adopted:

[0011] A multi-channel powder injection mixing pile drilling rig equipment, including a drilling rig main body, the drilling rig main body includes a drill rod and a multi-layer mutual shear mixing drill bit; at least a gas channel and an air flow channel are arranged in the drill rod; the multi-layer mutual shear mixing drill bit is connected to the bottom of the drill rod, and a focusing area is arranged in the bottom of the multi-layer mutual shear mixing drill bit; the focusing area is connected to the discharge end of the gas channel and the discharge end of the air flow channel, and the bottom of the multi-layer mutual shear mixing drill bit is also provided with a discharge nozzle connected to the focusing area; by continuously supplying high-pressure gas to the drilling rig main body, curing agent powder and high-pressure gas are respectively transported to the focusing area at the bottom of the multi-layer mutual shear mixing drill bit through the gas channel and the air flow channel in the drill rod, and are mixed and gasified in the focusing area to form a uniform mixture through focused reflection, and are sprayed out from the discharge nozzle of the multi-layer mutual shear mixing drill bit.

[0012] Preferably, the drill rod comprises an outer stirring rod and an inner stirring rod; the inner stirring rod is rotatably connected inside the outer stirring rod, and the gas material channel and the gas flow channel are fixedly arranged side by side inside the inner stirring rod.

[0013] Preferably, the drill rod includes an outer stirring rod and an inner stirring rod; the inner stirring rod is rotatably connected to the outer stirring rod, the gas channel is fixedly arranged on the central axis of the inner stirring rod, the annular gap between the gas channel and the inner stirring rod forms the air flow channel, and the gas channel is fixed by a three-rib support frame.

[0014] Preferably, the drill rod comprises an outer stirring rod and an inner stirring rod; the inner stirring rod is rotatably connected to the outer stirring rod, the gas channel is arranged in the inner stirring rod, and the annular gap between the outer stirring rod and the inner stirring rod forms the gas channel.

[0015] Preferably, the multi-layer shearing stirring drill bit includes a stirring outer frame, a first stirring wing, a second stirring wing, and a tunneling drill bit; the upper end of the stirring outer frame is fixedly connected to the outer stirring rod, and the lower end of the stirring outer frame is rotatably connected to the inner stirring rod through a sliding sleeve, and the first stirring wing is layered and fixedly connected to the inner side of the stirring outer frame; the second stirring wing is layered and fixedly connected to the inner stirring rod inside the stirring outer frame, and the first stirring wing and the second stirring wing are staggered and spaced and do not interfere with each other; the outer stirring rod drives the stirring outer frame and the first stirring wing to rotate, and the inner stirring rod drives the second stirring wing to rotate; the tunneling drill bit is fixedly connected to the bottom of the inner stirring rod, the focusing area is arranged in the tunneling drill bit, and the discharge nozzle is arranged on the outer peripheral wall of the tunneling drill bit.

[0016] Preferably, a drainage joint is provided between the tunneling drill bit and the bottom of the inner stirring rod, and a first drainage channel connected to the gas-material channel is provided on the drainage joint, and a second drainage channel connected to the air flow channel is provided on the drainage joint; and the lower end of the first drainage channel and the lower end of the second drainage channel are both flared structures.

[0017] Preferably, a focusing cavity is provided in the bottom of the multi-layer shearing and stirring drill bit; a focusing piece is provided at the bottom of the focusing cavity; a focusing concave surface opening upward is provided on the top surface of the focusing piece, and the focusing area is formed between the focusing concave surface and the discharge end of the gas channel and the gas outlet end of the gas channel.

[0018] Preferably, the discharge nozzle includes the distal nozzle and the proximal nozzle, the distal nozzle is arranged on a side wall of the drilling bit through a nozzle guide tube, and the proximal nozzle is arranged on the side wall of the drilling bit opposite to the distal nozzle, and the distal nozzle and the proximal nozzle are horizontally aligned, and the focusing point of the focusing concave surface is located below the horizontal line of the distal nozzle and the proximal nozzle.

[0019] Preferably, the drilling rig body also includes a tower mast, an inclined support, an equipment platform, a driving device and a walking unit; the tower mast is vertically arranged on the equipment platform, the inclined support fixedly connects the tower mast to the equipment platform, the driving device is suspended on the upper part of the tower mast, and the pulley group on the goose head at the top of the tower mast is used to drive the drill rod to be lowered and raised, the walking unit is arranged at the bottom of the equipment platform, the driving device includes a power mechanism and a rotary joint, the power mechanism is connected to the top of the drill rod through the rotary joint, and the power mechanism provides a rotational torque for the drill rod; a feed port and an air inlet are arranged on the rotary joint, the feed port is connected to the gas-material channel on the drill rod, and the air inlet is connected to the air flow channel on the drill rod.

[0020] In summary, the beneficial technical effects brought about by the utility model include:

[0021] 1. The drill pipe gas channel and air flow channel of the powder injection pile drilling rig are independent of each other. They are connected to the inside of the drilling drill bit in parallel or in sets. The high-pressure gas ejected from the air flow channel has a drainage effect on the medium in the gas channel, which can effectively reduce pipeline blockage.

[0022] 2. The concave focusing mechanism arranged in the boring drill bit can make the high-pressure airflow ejected from the airflow channel and the gas-solid two-phase flow ejected from the gas-material channel reflect after rushing to the focusing concave surface on the focusing component. The two reflected high-pressure fluids are mixed through the focal point, so that the powder curing agent is secondary vaporized, which greatly improves the uniformity of the gas-material mixture. In addition, the focusing component is made of cemented carbide or ceramic material, which can ensure the structural strength and service life of the focusing component.

[0023] 3. The double nozzle design of different lengths of the multi-layer shear mixing drill bit increases the injection radius of the powder injection pile. That is, by setting nozzles at the near and far ends of the excavation drill bit respectively, the problem of insufficient injection radius of the near-end nozzle can be effectively solved, thereby further improving the diameter of the powder injection pile.

[0024] 4. The application of multi-layer shear mixing drill bits can significantly improve the quality of powder injection piles, including the uniformity of the pile body and the continuity of the pile body strength. This structural design helps to improve the safety and stability of the project.

[0025] 5. The control module is crucial in the construction of powder injection pile drilling rig equipment. It can monitor the construction parameters in real time and automatically control the various monitoring instruments and meters of the equipment as well as the opening and closing of valves and switches. This intelligent control method of the equipment reduces human operating errors, ensures the safety, effectiveness and construction efficiency of the entire construction process, and improves the controllable reliability of powder injection pile construction.

[0026] 6. The multi-channel powder injection mixing pile drilling rig is equipped with a powerful drive device, which can provide the drilling rig with a large torque of 5 tm to 30 tm. Therefore, it can construct powder injection piles with large diameter (1500mm) and deep (35m), opening up a new market for the engineering application of powder injection piles and providing higher competitiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The utility model is a schematic diagram of the structure of a multi-channel powder injection mixing pile drilling rig.

[0028] Figure 2 This is a schematic diagram of the main structure of the drilling rig of the utility model.

[0029] Figure 3 This is a schematic diagram of the structure of the drive device of the utility model.

[0030] Figure 4 This is a schematic diagram of the rotary joint structure of Example 1 of the utility model.

[0031] Figure 5 This is a schematic diagram of the rotary joint structure of Example 2 of the utility model.

[0032] Figure 6 This is a schematic diagram of the structure of the third rotary joint of the utility model.

[0033] Figure 7 This is a cross-sectional view of the drill rod structure of Example 1 of the utility model.

[0034] Figure 8 This is a cross-sectional view of the drill rod structure of Example 2 of the utility model.

[0035] Fig. 9 This is a cross-sectional view of the drill rod structure of Example 1 of the utility model.

[0036] Fig.10 This is a cross-sectional view of the drill rod structure of Example 2 of the utility model.

[0037] Fig.11 This is a cross-sectional view of the third drill rod structure of the utility model.

[0038] Fig.12 This is a schematic diagram of the structure of a multi-layer shearing and stirring drill bit according to Example 1 of the utility model.

[0039] Fig.13 This is a schematic diagram of the structure of a multi-layer shearing and stirring drill bit according to Example 2 of the utility model.

[0040] Fig.14 This is a schematic diagram of the structure of zone A of the multi-layer mutual shearing and stirring drill bit in Example 1 of the utility model.

[0041] Fig.15 This is a schematic diagram of the structure of zone B of the multi-layer shearing and stirring drill bit in Example 2 of the utility model.

[0042] The reference numerals in the accompanying drawings are:

[0043] 100, drilling rig body; 110, tower mast; 120, inclined support; 130, equipment platform; 140, drill pipe; 141. External stirring rod; 142. Internal stirring rod; 143. Gas material channel; 144. Air flow channel; 147. Pin shaft; 148. Support frame; 150. Driving device; 151. Power mechanism; 152. Goose head; 153. Rotary joint; 155. Feed port; 156. Air inlet; 160. Multi-layer shearing stirring drill bit; 161. Stirring outer frame; 162. First stirring wing; 163. Second stirring wing; 164. Driving drill bit; 165. Distal nozzle; 166. Proximal nozzle; 167. Focusing cavity; 168. Focusing element; 169. Focusing concave surface; 170. Drainage joint; 171. First drainage channel; 172. Second drainage channel; 180. Walking unit; 200. Feeding backstage; 210. High-pressure material tank; 221. Air compressor A; 222. Air compressor B; 231. Vertical booster pipeline; 232. Gas pipeline; 233. Gas pipeline; 240. Injector system; 250. Gas storage tank; 260. Cold dryer; 300. Control module. DETAILED DESCRIPTION

[0044] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific embodiments of the utility model are described in detail below in conjunction with the accompanying drawings. Although the accompanying drawings show exemplary embodiments of the utility model, it should be understood that various forms of implementation methods can be expanded based on this embodiment. At the same time, this embodiment is only for the convenience of explaining the utility model so that the corresponding technical personnel can better understand its content. In the process of use, the various features of the utility model can be combined with each other and increased or decreased.

[0045] like Figures 1 to 13As shown, a multi-channel powder injection mixing pile drilling rig equipment includes a drilling rig body 100, a feeding backstage 200 and a control module 300. The drilling rig body 100 includes a tower mast 110, a diagonal support 120, an equipment platform 130, a drill rod 140, a driving device 150, a multi-layer mutual shear mixing drill bit 160 and a walking unit 180. The drill rod 140 is respectively provided with a gas channel 143 and an air flow channel 144; the multi-layer mutual shear mixing drill bit 160 is connected to the bottom of the drill rod 140, and a focusing area is provided at the bottom of the multi-layer mutual shear mixing drill bit 160; the focusing area is connected to the discharge end of the gas channel 143 and the air discharge end of the air flow channel 144, and the bottom of the multi-layer mutual shear mixing drill bit 160 is also provided with a discharge nozzle connected to the focusing area; the feeding backstage 200 is electrically connected to the control module 300, and the control module 300 controls the feeding backstage 200. Feeding control, continuously and evenly supplying curing agent powder to the drilling rig body 100 through the gas pipeline 232 in the feeding background 200, and continuously supplying high-pressure gas to the drilling rig body 100 through the gas pipeline 233 in the feeding background 200, so that the curing agent powder and the high-pressure gas are respectively transported to the focusing area at the bottom of the multi-layer shearing and stirring drill bit 160 through the gas channel 143 and the air flow channel 144 in the drill rod 140, and are reflected, mixed and gasified in the focusing area and ejected from the discharge nozzle of the multi-layer shearing and stirring drill bit 160.

[0046] like Figure 1 As shown, the feeding backstage 200 includes a high-pressure material tank 210, a sprayer system 240, an air compressor A221, an air compressor B222, a gas tank 250 and a cold dryer 260. The entire feeding backstage 200 is provided with high-pressure gas for conveying curing agent powder by the air compressor A221, and the air compressor A221 is sequentially connected to the gas tank 250, the cold dryer 260, the high-pressure material tank 210, the sprayer system 240, the gas pipeline 232 and the vertical booster pipeline 231. The air compressor B222 is connected to the gas pipeline 233 and provides high-pressure gas for secondary gasification of the curing agent powder in the focusing cavity 167 of the multi-layer shear mixing drill bit 160. The high-pressure tank 210 is provided with a screw conveying device for transporting the curing agent powder in the tank to the inside of the jetting system 240 at a constant speed and in a quantitative manner; the gas pipeline 232 is a transportation channel for gas-solid fluids, and the vertical booster pipeline 231 provides additional high-pressure gas driving force through an oblique booster in the vertical ascending section of the gas pipeline 232 to prevent the powder from accumulating and clogging due to gravity. The control module 300 uses a PLC control program to measure and control the internal pressure of the high-pressure tank 210, control the designed speed and designed feeding amount of the screw conveying device, and control the various switch valves, pressure gauges, regulating valves, and flow meters of the feeding backstage 200, and continuously, stably and evenly transport the curing agent powder to the drilling rig body 100 through the gas pipeline 232.

[0047] like Figure 2As shown, the tower mast 110 is vertically arranged on the equipment platform 130, the inclined support 120 connects the tower mast 110 with the equipment platform 130, the driving device 150 is suspended under the goose head 152 and the pulley at the top of the tower mast 110, and the pulley group on the goose head 152 drives the drill rod 140 to descend and rise, the walking unit 180 is arranged at the bottom of the equipment platform 130, the driving device 150 includes a power mechanism 151 and a rotary joint 153, the power mechanism 151 is connected to the top of the drill rod 140 through the rotary joint 153, and the power mechanism 151 provides rotational power for the outer stirring rod 141 and the inner stirring rod 142; the rotary joint 153 is provided with a feed port 155 and an air inlet 156, the feed port 155 is connected to the gas material channel 143 on the drill rod 140, and the air inlet 156 is connected to the air flow channel 144 on the drill rod 140. The tower mast 110, the inclined support 120, the equipment platform 130 and the walking unit 180 are the main structures of the drilling rig; the height of the drilling rig body 100 is 22m to 40m, which can be reasonably selected according to the length of the construction pile. The walking unit 180 can use a drum type, a walking type or a crawler type chassis structure according to the conditions of the construction site. The goose head 152 and the pulley block at the top of the tower mast 110 are hoisted with a driving device 150 and a multi-layer shear mixing drill bit 160.

[0048] like Figure 3 As shown, the driving device 150 includes a power mechanism 151 for providing power for the drill rod 140 and a rotary joint 153 for connecting with the drill rod 140. The power mechanism 151 can use two motors or two hydraulic motors to drive the outer stirring rod 141 and the inner stirring rod 142 respectively, or a single motor or four hydraulic motors can be used to drive the inner and outer stirring rods through a transmission mechanism; the total power of the power mechanism 151 is 90kW to 250kW, and a power device with corresponding power is selected according to the designed construction diameter and pile length. The length of the powder injection pile construction is between 10m and 35m, and the construction diameter is between 500mm and 1500mm.

[0049] like Figure 7 and Figure 8 As shown, the drill rod 140 includes an outer stirring rod 141 and an inner stirring rod 142; the drill rod 140 can be assembled in sections, and each short section drill rod 140A is fixedly connected by a male and female hexagonal joint and a pin 147 to form a long drill rod. The inner stirring rod 142 is rotatably connected to the outer stirring rod 141, and the cross-sections of the outer stirring rod 141 and the inner stirring rod 142 are both circular. There are three distribution modes of the gas material channel 143 and the gas flow channel 144, such as Figure 4 , Figure 7 As shown, the gas material channel 143 and the gas flow channel 144 are fixedly arranged side by side in the inner stirring rod 142. Figure 5 , Figure 8As shown in the second arrangement of the gas channel 143 and the air flow channel 144, the gas channel 143 is fixedly arranged on the central axis of the inner stirring rod 142, the annular gap between the gas channel 143 and the inner stirring rod 142 forms the air flow channel 144, and the gas channel 143 is fixed by a three-rib support frame 148, and the three-rib support frame 148 plays a role in fixing the inner stirring rod 142 and the gas channel 143. Figure 6 As shown, the third arrangement of the gas channel 143 and the air flow channel 144, the gas channel 143 is located inside the inner stirring rod 142, the annular gap between the outer stirring rod 141 and the inner stirring rod 142 forms the air flow channel 144, and the inner stirring rod 142 is fixed by a three-rib support frame 148, and the three-rib support frame 148 plays a role of fixing the outer stirring rod 141 and the inner stirring rod 142 between the two.

[0050] like Figures 4 to 6 As shown, the rotary joint 153 has three arrangement structures according to the gas channel 143 and the air channel 144 of the drill rod 140. When the gas channel 143 and the air channel 144 are arranged side by side in the inner stirring rod 142, the rotary joint 153 is as follows: Figure 4 As shown in FIG. 1 , the feed port 155 is arranged at the middle position of the top of the rotary joint 153, and the air inlet 156 is arranged on the side wall of the rotary joint 153. The gas channel 143 and the air channel 144 can be adjusted in direction after entering the inner stirring rod 142, so that the double channels are kept on both sides of the central axis of the inner stirring rod 142. When the gas channel 143 is located on the central axis of the inner stirring rod 142, and the annular gap area between the gas channel 143 and the inner stirring rod 142 is used as the air channel 144, the rotary joint 153 is as shown in FIG. Figure 5 As shown, the feed port 155 and the air inlet 156 are distributed on both sides of the rotary joint 153, and then connected to the gas channel 143 and the air flow channel 144 respectively after changing direction. When the gas channel 143 is located in the inner stirring rod 142, and the annular gap area between the outer stirring rod 141 and the inner stirring rod 142 is used as the air flow channel 144, the rotary joint 153 is as shown in FIG. Figure 6 As shown, the feed port 155 and the air inlet 156 are distributed on both sides of the rotary joint 153, and are respectively connected to the air material channel 143 and the air flow channel 144 after changing their directions.

[0051] like Figure 1 As shown, in the above three structures, the curing agent powder is transported by gas-solid two-phase flow through a path composed of the gas pipeline 232, the feed port 155 and the gas channel 143, while the high-pressure gas is transported by high-pressure airflow through a path composed of the gas pipeline 233, the air inlet 156 and the air flow channel 144.

[0052] like Fig.12 and Fig.13As shown, the multi-layer shearing mixing drill bit 160 is provided with a mixing outer frame 161, a first mixing wing 162, a second mixing wing 163 and a driving drill bit 164. For large-diameter powder injection mixing piles, the diameter of the multi-layer shearing mixing drill bit 160 can reach 1500mm; the upper end of the mixing outer frame 161 is fixedly connected to the outer mixing rod 141, and the lower end is rotatably connected to the inner mixing rod 142 through a sleeve, and the outer mixing rod 141 drives the mixing outer frame 161 to rotate; the first mixing wing 162 is arranged on the inner side of the mixing outer frame 161 and rotates with the mixing outer frame 161; the second mixing wing 163 is fixedly connected to the inner mixing rod 142 inside the mixing outer frame 161, and the inner mixing rod 142 drives the second mixing wing 163 to rotate, and the first mixing wing 162 and the second mixing wing 163 are arranged in staggered layers and do not interfere with each other. The use of the multi-layer mutual shear mixing drill bit 160 can achieve relative rotational shear mixing between the upper and lower adjacent mixing wings, which has a more effective mixing effect on the foundation soil and further improves the construction efficiency and construction quality of the powder injection mixing piles.

[0053] like Fig.14 and Fig.15 As shown, the excavation drill bit 164 is installed at the bottom of the multi-layer shearing and mixing drill bit 160, the focusing area is set in the excavation drill bit 164, and the discharge nozzle is set on the outer peripheral wall of the excavation drill bit 164. A focusing cavity 167 is set in the excavation drill bit 164, which is connected to the bottom of the gas channel 143 and the gas channel 144. The two sides of the excavation drill bit 164 are respectively provided with a distal nozzle 165 and a proximal nozzle 166 connected to the focusing cavity 167, and the two nozzles are arranged horizontally and aligned, and both nozzles adopt a contraction structure. The combined use of the proximal nozzle 166 and the distal nozzle 165 can meet the needs of constructing large-diameter powder injection piles, that is, the injection area that the proximal nozzle 166 cannot reach can be covered by the curing agent powder injection of the distal nozzle 165. A focusing member 168 is provided at the bottom of the focusing cavity 167; a focusing concave surface 169 with an upward opening is provided on the top surface of the focusing member 168, and a focusing area is formed between the focusing concave surface 169 and the discharge end of the gas channel 143 and the gas discharge end of the gas channel 144. The focusing point of the focusing concave surface 169 is located below the horizontal line connecting the proximal nozzle 166 and the distal nozzle 165.

[0054] The drill bit connected to the multi-layer shear mixing drill bit 160 adopts a dual-channel design, which can independently and simultaneously transport the high-pressure airflow and the gas-solid two-phase flow, effectively reducing pipeline blockage; and through the concave focusing structure in the drill bit, the high-pressure airflow ejected from the airflow channel 144 and the gas-solid two-phase flow ejected from the gas-material channel 143 can be reflected after rushing to the concave focusing part 168, and the two reflected fluids are mixed through the focal point, so that the curing agent powder is secondary gasified, thereby improving the uniformity of the mixture, which is further beneficial to improving the uniformity of the powder injection pile mixing and the continuity of the pile body strength. At the same time, the pile quality and efficiency of the powder injection mixing pile are improved.

[0055] A drainage joint 170 is provided at the bottom of the drilling bit 164 and the inner stirring rod 142 of the drill bit. The drainage joint 170 is located in the focusing cavity 167. The drainage joint 170 is provided with a first drainage channel 171 connected to the gas material channel 143 and a second drainage channel 172 connected to the gas flow channel 144; and the lower ends of the first drainage channel 171 and the second drainage channel 172 are both flared. The double-tube drainage structure design of the drainage joint 170 can effectively reduce pipeline blockage. At the same time, the flared structure design provides auxiliary power for the gas-solid two-phase flow ejected from the gas material channel 143, which not only reduces the risk of nozzle blockage but also increases the nozzle's ejection radius.

[0056] A construction method of a multi-channel powder injection mixing pile drilling rig equipment specifically includes the following construction steps:

[0057] S1. Before construction, align the multi-layer shear mixing drill bit 160 of the drilling rig body 100 with the construction pile position, adjust the verticality of the tower mast 110 and the drill rod 140; inject the curing agent powder required for construction into the high-pressure material tank 210, and close the feed port and exhaust port of the high-pressure tank body.

[0058] S2. Turn on the air compressor A221 to maintain smooth air supply to the gas pipeline 232, the gas channel 143 and the vertical booster pipeline 231 according to the planned gas supply pressure and gas supply volume. At the same time, turn on the air compressor B222 to supply air to the gas pipeline 233 and the gas flow channel 144 to provide sufficient high-pressure gas for the secondary gasification of the curing agent powder inside the focusing cavity 167.

[0059] S3, during the rotary drilling and mixing stage of the drilling tool, the driving device 150 drives the inner and outer stirring rods to rotate downward in opposite directions, and the first stirring wing 162 and the second stirring wing 163 of the multi-layer shearing stirring drill bit 160 rotate at a set speed to mix the foundation soil. At the same time, the spiral conveying device is turned on to stably and quantitatively convey the curing agent powder to the sprayer system 240, and the gas-solid two-phase fluid is sprayed into the foundation soil through the gas pipeline 232, the gas channel 143, the far-end nozzle 165 and the near-end nozzle 166 by high-pressure gas injection. The downward construction is completed until the designed pile bottom elevation is reached and the feeding is stopped.

[0060] S4, during the stage of rotating and lifting the drill bit for mixing, the inner and outer mixing rods rotate in opposite directions and the drill rod 140 is lifted at a set speed. During this construction, a small amount of high-pressure gas is continuously sprayed through each nozzle to ensure that each nozzle will not be blocked, until the multi-layer shear mixing drill bit 160 is lifted off the ground, the gas supply is stopped and the powder injection pile construction is ended.

[0061] S5. Move the machine to the next pile position and repeat the above process steps S1 to S4 to construct the next powder injection pile. Example

[0062] The following is combined with Figures 1 to 4 , 7, 9, 12 and 14 further illustrate the utility model. The engineering background of this embodiment is the foundation pit support project of the intercity train station in the city along the river. The two sides of the continuous wall around the foundation pit are reinforced by using powder injection mixing piles. The pile length is 30m and the pile diameter is 1200mm. Basic geological conditions: There are three layers of soil within 30 meters below the surface, ① miscellaneous fill, layer thickness 1~2m; ② silt soil, layer thickness 20~25m, water content 78%, porosity 1.42, standard penetration number 1~2; ③ silt clay, layer thickness 10~15m, water content 57%, porosity 0.88, standard penetration number 9~12. The powder injection mixing pile adopts P.O42.5 cement with a cement content of 20%. It is constructed using a double-channel powder injection mixing pile drilling rig. The construction process of four-mixing and two-spraying drilling and powder spraying is applied. The unconfined compressive strength of the 28-day core sample of the mixing pile is required to be no less than 1.2MPa.

[0063] In this embodiment, the drilling rig body 100 is 36m high, the construction site has been hardened, the walking unit 180 adopts a crawler chassis, the power mechanism 151 in the driving device 150 adopts a dual motor, the motor power is 2╳75kW, and the outer stirring rod 141 and the inner stirring rod 142 are driven respectively; the rotary joint 153 adopts Figure 4 Medium structure, drill rod 140 adopts Figure 6 , Figure 8 The gas material channel 143 and the gas flow channel 144 are arranged side by side in the inner stirring rod 142; the multi-layer mutual shear stirring drill bit 160 adopts Fig.10 In the structure, since the gas material channel 143 and the gas flow channel 144 are arranged side by side, the structure of the drilling bit 164 is as follows Fig.12 As shown, the first drainage channel 171 and the second drainage channel 172 on the drainage joint 170 are arranged side by side, the gas material channel 143 is connected to the first drainage channel 171, the air flow channel 144 is connected to the second drainage channel 172, and the lower ends of the first drainage channel 171 and the second drainage channel 172 are both flared structures; the focusing cavity 167 is connected to the bottom of the gas material channel 143 and the air flow channel 144, and the left and right sides of the excavation drill bit 164 are respectively provided with a distal nozzle 165 and a proximal nozzle 166 connected to the focusing cavity 167, and the two nozzles are arranged horizontally and aligned and have a contracted structure. A focusing member 168 is provided at the bottom of the focusing cavity 167, and a focusing concave surface 169 with an upward opening is provided on the top surface thereof, and the focusing point of the focusing concave surface 169 is located below the horizontal line of the distal nozzle 165 and the proximal nozzle 166.

[0064] The construction process in this embodiment is the same as the above-mentioned specific implementation method and will not be described in detail. Example

[0065] The following is combined with Figures 1 to 3 , 5, 8, 10, 13 and 15 further illustrate the utility model. The engineering background of this embodiment is the foundation engineering of a high-rise office building in a port. A strong core composite pile is used as the foundation, in which the powder injection mixing pile is 22m long and 1000mm in diameter, and the PHC pipe pile is inserted inside with a pile diameter of 800mm and a pile length of 30m. The design ultimate bearing capacity of a single pile is 2500kN.

[0066] Basic geological conditions of this embodiment: ① silt soil layer, layer thickness 11-12m, water content 82%, porosity 1.456, standard penetration number 1-2; ② saturated soft clay, layer thickness 12-18m, water content 64%, porosity 1.875, standard penetration number 7-10; ③ silty clay, layer thickness 10-14m, water content 56%, porosity 0.732, standard penetration number 12-18. The powder injection mixing pile uses KD curing agent as the reinforcement material, with a dosage of 15%, and is constructed using a double-channel powder injection mixing pile drilling rig. The construction uses a two-mixing and one-spraying drilling and powder spraying construction process, and the prefabricated pipe piles are implanted using a pile driver.

[0067] The equipment structure of the dual-channel powder injection mixing pile drilling rig in this embodiment is similar to that in the embodiment 1, except that: the main body 100 of the mixing pile drilling rig in the embodiment 2 is 30m high, the walking unit 180 adopts a walking chassis, the power mechanism 151 in the driving device 150 adopts two hydraulic motors, the power of the hydraulic motor is 2╳55kW, and the outer stirring rod 141 and the inner stirring rod 142 are driven respectively; the rotary joint 153 adopts Figure 5 Medium structure, drill rod 140 adopts Figure 7 and Fig. 9 The gas channel 143 is arranged on the central axis of the inner stirring rod 142, the annular gap between the gas channel 143 and the inner stirring rod 142 forms an air flow channel 144, and the gas channel 143 is fixed by a three-rib support frame 148.

[0068] Multi-layer shear mixing drill bit 160 adopts Fig.11 Since the air flow channel 144 is wrapped around the outside of the gas material channel 143, the structure of the drilling bit 164 is as follows Fig.13As shown. The second drainage channel 172 on the drainage joint 170 is wrapped around the outside of the first drainage channel 171, the gas channel 143 is connected to the first drainage channel 171, the air channel 144 is connected to the second drainage channel 172, and the lower ends of the first drainage channel 171 and the second drainage channel 172 are both in a flared structure; the focusing cavity 167 is connected to the bottom of the gas channel 143 and the air channel 144, and the left and right sides of the excavation drill bit 164 are respectively provided with a distal nozzle 165 and a proximal nozzle 166 connected to the focusing cavity 167, and the two nozzles are arranged horizontally and aligned, and the nozzles are both in a contracted structure; the bottom of the focusing cavity 167 is provided with a focusing member 168, and the top surface thereof is provided with a focusing concave surface 169 opening upward, and the focusing point of the focusing concave surface 169 is located below the horizontal line of the distal nozzle 165 and the proximal nozzle 166.

[0069] The construction method in this embodiment is the same as the specific implementation method and will not be described in detail.

[0070] In summary, the beneficial technical effects brought about by the utility model include:

[0071] 1. The drill pipe gas channel 143 and the air flow channel 144 of the powder injection pile drilling rig are independent of each other. They are connected to the inside of the drilling drill bit 164 in parallel or in a sleeve manner. The high-pressure gas ejected from the drainage channel has a drainage effect on the medium in the gas channel 143, which can effectively reduce pipeline blockage.

[0072] 2. The concave focusing mechanism arranged in the tunneling drill bit 164 can make the high-pressure airflow ejected from the airflow channel 144 and the gas-solid two-phase flow ejected from the gas-material channel 143 reflect after rushing to the focusing concave surface 169 on the focusing piece 168. The two reflected high-pressure fluids are mixed through the focal point, so that the powder curing agent is secondary vaporized, which greatly improves the uniformity of the gas-material mixture. In addition, the focusing piece 168 is made of cemented carbide or ceramic material, which can ensure the structural strength and service life of the focusing piece 168.

[0073] 3. The double nozzle design of different lengths of the multi-layer shear mixing drill bit 160 increases the injection radius of the powder injection pile. That is, by arranging nozzles at the proximal and distal ends of the excavation drill bit 164 respectively, the problem of insufficient injection radius of the proximal nozzle 166 can be effectively solved, thereby further increasing the diameter of the powder injection pile.

[0074] 4. The use of the multi-layer mutual shearing and mixing drill bit 160 can significantly improve the quality of the powder injection pile, including the uniformity of the pile body and the continuity of the pile body strength; this structural design is helpful to improve the safety and stability of the project.

[0075] 5. The control module 300 is crucial in the construction of powder injection pile drilling rig equipment. It can monitor the construction parameters in real time and automatically control the various monitoring instruments and meters of the equipment as well as the opening and closing of various valves and switches. This intelligent control method of the equipment reduces human operating errors, ensures the safety, effectiveness and construction efficiency of the entire construction process, and improves the controllable reliability of powder injection pile construction.

[0076] 6. The multi-channel powder injection pile drilling rig is equipped with a powerful drive device 150, which can provide the drilling rig with a large torque of 5 tm to 30 tm. Therefore, it can construct powder injection piles with large diameter (1500mm) and deepness (35m), opening up a new market for the engineering application of powder injection piles and providing higher market competitiveness.

[0077] Although the disclosure is disclosed as above, the protection scope of the disclosure is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the disclosure, and these changes and modifications will fall within the protection scope of the utility model.

Claims

1. A multi-channel powder injection mixing pile drilling rig equipment, characterized in that: The invention comprises a drilling rig body (100), wherein the drilling rig body (100) comprises a drill rod (140) and a multi-layer mutual shearing and stirring drill bit (160); at least a gas material channel (143) and an air flow channel (144) are provided in the drill rod (140); the multi-layer mutual shearing and stirring drill bit (160) is connected to the bottom of the drill rod (140); a focusing area is provided in the bottom of the multi-layer mutual shearing and stirring drill bit (160); the focusing area is communicated with both the discharge end of the gas material channel (143) and the discharge end of the air flow channel (144); The bottom of the multi-layer mutual shearing and stirring drill bit (160) is also provided with a discharge nozzle connected to the focusing area; by continuously supplying high-pressure gas to the drilling rig body (100), the curing agent powder and the high-pressure gas are respectively transported to the focusing area at the bottom of the multi-layer mutual shearing and stirring drill bit (160) through the gas channel (143) and the gas channel (144) in the drill rod (140), and are mixed and gasified in the focusing area to form a uniform mixture through focused reflection, and are then ejected from the discharge nozzle of the multi-layer mutual shearing and stirring drill bit (160).

2. The multi-channel powder injection mixing pile drilling rig equipment according to claim 1 is characterized in that: The drill rod (140) comprises an outer stirring rod (141) and an inner stirring rod (142); the inner stirring rod (142) is rotatably connected inside the outer stirring rod (141), and the gas material channel (143) and the gas flow channel (144) are fixedly arranged side by side inside the inner stirring rod (142).

3. The multi-channel powder injection mixing pile drilling rig equipment according to claim 1 is characterized in that: The drill rod (140) comprises an outer stirring rod (141) and an inner stirring rod (142); the inner stirring rod (142) is rotatably connected inside the outer stirring rod (141); the gas channel (143) is fixedly arranged on the central axis of the inner stirring rod (142); an annular gap between the gas channel (143) and the inner stirring rod (142) forms the gas channel (144); and the gas channel (143) is fixed by a three-rib support frame (148).

4. The multi-channel powder injection mixing pile drilling rig equipment according to claim 1 is characterized in that: The drill rod (140) comprises an outer stirring rod (141) and an inner stirring rod (142); the inner stirring rod (142) is rotatably connected inside the outer stirring rod (141), the gas material channel (143) is arranged inside the inner stirring rod (142), and the annular gap between the outer stirring rod (141) and the inner stirring rod (142) forms the gas flow channel (144).

5. The multi-channel powder injection mixing pile drilling rig equipment according to claim 2, 3 or 4, characterized in that: The multi-layer mutual shear stirring drill bit (160) comprises a stirring outer frame (161), a first stirring wing (162), a second stirring wing (163), and a tunneling drill bit (164); the upper end of the stirring outer frame (161) is fixedly connected to the outer stirring rod (141), the lower end of the stirring outer frame (161) is rotatably connected to the inner stirring rod (142) via a sliding sleeve, the first stirring wing (162) is fixedly connected in layers to the inner side of the stirring outer frame (161); the second stirring wing (163) is fixedly connected in layers to the inner side of the stirring outer frame (161). On the inner stirring rod (142) of the part, the first stirring wing (162) and the second stirring wing (163) are arranged in a staggered manner and do not interfere with each other; the outer stirring rod (141) drives the stirring outer frame (161) and the first stirring wing (162) to rotate, and the inner stirring rod (142) drives the second stirring wing (163) to rotate; the tunneling drill bit (164) is fixedly connected to the bottom of the inner stirring rod (142), the focusing area is arranged in the tunneling drill bit (164), and the discharge nozzle is arranged on the outer peripheral wall of the tunneling drill bit (164).

6. The multi-channel powder injection mixing pile drilling rig equipment according to claim 5 is characterized in that: A drainage joint (170) is provided between the excavation drill bit (164) and the bottom of the inner stirring rod (142); a first drainage channel (171) communicating with the gas-material channel (143) is provided on the drainage joint (170); and a second drainage channel (172) communicating with the gas flow channel (144) is provided on the drainage joint (170); and the lower ends of the first drainage channel (171) and the second drainage channel (172) are both flared structures.

7. The multi-channel powder injection mixing pile drilling rig equipment according to claim 1 is characterized in that: A focusing cavity (167) is provided in the bottom of the multi-layer mutual shearing and stirring drill bit (160); a focusing piece (168) is provided at the bottom of the focusing cavity (167); a focusing concave surface (169) opening upward is provided on the top surface of the focusing piece (168); the focusing concave surface (169) and the material outlet end of the gas channel (143) and the gas outlet end of the gas channel (144) form the focusing area.

8. The multi-channel powder injection mixing pile drilling rig equipment according to claim 7 is characterized in that: The discharge nozzle comprises a distal nozzle (165) and a proximal nozzle (166); the distal nozzle (165) is arranged on a side wall of the excavation drill bit (164) through a nozzle guide tube; the proximal nozzle (166) is arranged on a side wall of the excavation drill bit (164) opposite to the distal nozzle (165); the distal nozzle (165) and the proximal nozzle (166) are arranged horizontally aligned; and the focusing point of the focusing concave surface (169) is located below the horizontal line of the distal nozzle (165) and the proximal nozzle (166).

9. The multi-channel powder injection mixing pile drilling rig equipment according to claim 1, characterized in that: The drilling rig body (100) further comprises a tower mast (110), an inclined support (120), an equipment platform (130), a driving device (150) and a walking unit (180); the tower mast (110) is vertically arranged on the equipment platform (130); the inclined support (120) fixedly connects the tower mast (110) and the equipment platform (130); the driving device (150) is suspended on the upper part of the tower mast (110); and the pulley block on the goose head (152) at the top of the tower mast (110) is used to drive the drill rod (140) to be lowered and raised; the walking unit (180) ) is arranged at the bottom of the equipment platform (130), the driving device (150) comprises a power mechanism (151) and a rotary joint (153), the power mechanism (151) is connected to the top of the drill rod (140) through the rotary joint (153), and the power mechanism (151) provides a rotational torque for the drill rod (140); the rotary joint (153) is provided with a feed port (155) and an air inlet (156), the feed port (155) is communicated with the gas-material channel (143) on the drill rod (140), and the air inlet (156) is communicated with the air flow channel (144) on the drill rod (140).

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