Stirring and spraying three-in-one drill bit for jet grouting pile construction

Abstract

The utility model relates to a stirring and spraying three-in-one drill bit for jet grouting pile construction, which comprises a drill body, an air channel and a water channel are arranged in the drill body, and a cutting head is arranged at the head of the drill body. The drill body comprises a first pressure execution assembly, a second pressure execution assembly and a third pressure execution assembly. The first pressure execution assembly comprises a first piston rod, a lower cutting water opening valve and a cutting nozzle; the second pressure execution assembly comprises a water path nozzle and an air path nozzle which are arranged on two sides of the drill body; the third pressure execution assembly comprises an oil cylinder, a second piston rod, a transmission shaft, a rack, a gear and blades. Hole guiding, cutting and reaming are achieved at the same time, the blades are used, physical stirring is achieved, the quality of a pile body is obviously improved, and the technical method that the oil cylinder controls the gear and the rack to open the blades is adopted, so that reaming work is stable, and efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the field of jet grouting pile construction, and specifically relates to a combined stirring and jetting drill bit for jet grouting pile construction. Background Art

[0002] The high-pressure jet grouting method, abbreviated as jet grouting pile, emerged in the 1970s and was comprehensively developed and applied in China in the 1980s and 1990s. Practice has proved that this method has good effects on treating silt, silty soil, cohesive soil, silty soil, sandy soil, artificial fill, crushed stone soil, etc. China has included it in the current "Code for Foundation and Foundation Construction".

[0003] For a jet grouting pile, a drilling rig is used to place a grouting pipe and a jet grouting bit at the designed elevation of the pile bottom. Through a high-pressure generating device, the cement slurry obtains great energy and then jets out at a high speed from the nozzle of the jet grouting bit, forming a jet flow with highly concentrated energy that directly destroys the soil mass. During the jetting process, the jet grouting bit rotates and ascends simultaneously, so that the cement slurry is fully stirred and mixed with the soil mass, and a continuous overlapping cement solid is formed in the soil mass, thereby strengthening the foundation.

[0004] The construction of a jet grouting pile is divided into two stages. The first stage is to drill a pilot hole. The diameter of the pilot hole is 180 - 300 mm, and the depth is generally 30 - 80 m. As the depth increases, especially when the depth exceeds 50 meters, the quality of the pile body of the jet grouting pile cannot be fully guaranteed.

[0005] When drilling the pilot hole, a drilling rig is required. By continuously adding drill pipes, the drill bit can reach the predetermined drilling depth. The time required to drill a pilot hole with a depth of more than 50 meters is generally more than 20 hours, and most of the time is spent on installing and removing drill pipes.

[0006] The second stage is the jet grouting and hole expansion stage. Through the drilling rig, a grouting pipe and a jet grouting bit are placed into the pilot hole. The jet grouting bit jets the cement slurry while ascending from the bottom up, expanding the diameter of the pilot hole. After the cement slurry is mixed with the soil mass, a jet grouting pile is formed. In order to fully stir and mix the cement slurry with the soil mass, stirring blades are also provided on the jet grouting bit. Although the construction time of the jet grouting and hole expansion stage is less than that of the drill pilot hole stage, most of the time is also spent on installing and removing the grouting pipe.

[0007] Currently, the biggest problem in jet grouting pile construction is that each construction requires at least a continuous injection of hundreds of jet grouting piles, and the construction time of each jet grouting pile is more than 30 hours. This not only occupies the drilling rig for a long time but also seriously delays the construction period. The jet grouting construction uses high-pressure media to jet and break the soil to form piles. The pile diameter and the quality of the formed piles are greatly affected by the soil layer. The soil layer distribution is significantly uneven, making it difficult to control the quality of the pile body. Summary of the Invention

[0008] The utility model aims to overcome the defects of the prior art and provide a combined stirring and spraying drill bit for jet grouting pile construction, which can simultaneously achieve hole leading, cutting and hole expanding, with high and stable working efficiency and shortened construction period.

[0009] In order to solve the above technical problems, the utility model is realized as follows:

[0010] A combined stirring and spraying drill bit for jet grouting pile construction, characterized in that: it includes a drill body, which is rod-shaped, and has an air passage and a water passage inside, and a cutting head is provided at the head of the drill body;

[0011] The drill body includes a first pressure execution component, a second pressure execution component and a third pressure execution component;

[0012] The first pressure execution component includes a first piston rod, a lower cutting water opening valve and a cutting nozzle;

[0013] The second pressure execution component includes water nozzles and air nozzles arranged on both sides of the drill body;

[0014] The third pressure execution component includes an oil cylinder, a second piston rod, a transmission shaft, a rack, a gear and a blade;

[0015] When leading a hole, water is passed through the water passage, the lower cutting water opening valve is opened, and the water in the water passage enters the cutting nozzle;

[0016] When cutting, air is passed through the air passage, the first piston rod moves downward, closing the lower cutting water opening valve, and the water in the water passage and the air in the air passage respectively enter the water nozzles and air nozzles on both sides of the drill body to achieve high-pressure water and air cutting;

[0017] When expanding a hole, the water in the water passage enters the oil cylinder, the second piston rod moves downward, the transmission shaft cooperating with it drives the rack downward, and the rack drives the gear to rotate and open the blade to achieve hole expansion.

[0018] After implementing the above technical solution, beneficial effects are produced: hole leading, cutting and hole expanding are simultaneously achieved, and the use of the blade realizes physical stirring, significantly improving the quality of the pile body and reducing the amount of cement used; through the technical method of controlling the gear and rack by the oil cylinder to open the blade, the hole expansion work is stable and the efficiency is improved.

[0019] The combined stirring and spraying drill bit for jet grouting pile construction is characterized in that: it further includes a disc spring, which is arranged at the lower part of the second piston rod and is used to retract the blade.

[0020] The combined stirring and spraying drill bit for jet grouting pile construction is characterized in that: it further includes a guide spline, which is embedded between the disc spring and the transmission shaft.

[0021] After implementing the above technical solution, beneficial effects are achieved: When the disc spring is working, the drive shaft can be prevented from being stuck due to rotation or uneven force-induced side bending through the guiding spline; the disc spring can provide a large elastic force within a small compression stroke.

[0022] A combined stirring and spraying drill bit for jet grouting pile construction is characterized in that: a pressure sensor is arranged inside the drill body, and the pressure sensor is used to sense the pressure of water and gas inside the drill bit.

[0023] After implementing the above technical solution, beneficial effects are achieved: The pressure sensor can sense the pressure of water and gas inside the drill bit, providing a reference for ground personnel and facilitating timely troubleshooting.

[0024] A combined stirring and spraying drill bit for jet grouting pile construction is characterized in that: a displacement sensor is arranged inside the drill body, and the displacement sensor is used to sense the opening angle of the blade.

[0025] After implementing the above technical solution, beneficial effects are achieved: The displacement sensor can sense the opening angle of the stirring blade, providing a reference for ground personnel and facilitating timely troubleshooting. Brief Description of the Drawings

[0026] The following further describes the present utility model in detail in conjunction with the drawings and embodiments:

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

[0028] Figure 2 It is a schematic diagram of the reaming part.

[0029] Figure 3 It is a schematic diagram of the pilot hole and cutting part. Detailed Embodiments

[0030] The technical solutions of the embodiments of the present application will be clearly and completely described below in conjunction with the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts belong to the scope protected by the present application.

[0031] As Figures 1-3 shown: A combined stirring and spraying drill bit for jet grouting pile construction includes a drill body 1, which is rod-shaped, and has an air passage 3 and a water passage 2 inside it, and a cutting head 7 is provided at the head of the drill body;

[0032] The drill body includes a first pressure execution component, a second pressure execution component, and a third pressure execution component;

[0033] The first pressure execution component includes a first piston rod 10, a lower cutting water opening valve 6, and a cutting nozzle 8;

[0034] The second pressure execution component includes water nozzles 4 and air nozzles 5 provided on both sides of the drill body;

[0035] The third pressure execution component includes an oil cylinder 9, a second piston rod 11, a transmission shaft 15, a rack 12, a gear 13, and a blade 14;

[0036] When drilling a pilot hole, water flows through the water passage, the lower cutting water opening valve is opened, and the water in the water passage enters the cutting nozzle on the cutting head; the water sprays out from the cutting nozzle and plays a lubricating role during the pilot hole drilling.

[0037] When cutting, air flows through the air passage, the first piston rod moves downward to close the lower cutting water opening valve, and the water in the water passage and the air in the air passage enter the water nozzles and air nozzles on both sides of the drill body respectively to achieve high-pressure water and gas cutting;

[0038] When reaming, the water in the water passage enters the oil cylinder, the second piston rod moves downward, the transmission shaft cooperating with it drives the rack downward, and the rack drives the gear to rotate and open the blade to achieve reaming.

[0039] It also includes a disc spring 18, which is provided at the lower part of the second piston rod and is used to retract the blade.

[0040] It also includes a guide spline 16, which is embedded between the disc spring and the transmission shaft.

[0041] A pressure sensor is provided in the drill body, and the pressure sensor is used to sense the pressure of water and gas in the drill bit.

[0042] A displacement sensor 17 is provided in the drill body, and the displacement sensor is used to sense the opening angle of the blade.

[0043] The pressure sensor is used to sense the pressure of water and gas in the drill bit, and the displacement sensor is used to sense the opening angle of the blade. Setting the pressure sensor and the displacement sensor can provide reference for the ground personnel, which is beneficial for the ground personnel to understand the working state of the drill bit and troubleshoot in time.

[0044] Working process:

[0045] The combined stirring, spraying and cutting drill bit rotates and descends while the cutting head performs cutting and tunneling. At this time, the ground pump station passes water into the water passage of the drill bit through the drill pipe, and the water sprays out from the cutting nozzle to impact and cut the bottom soil layer. The water sprayed out through the nozzle impacts and cuts the bottom soil layer; and softens the soil layer, which is beneficial for the tunneling of the cutting head; as the water is discharged out of the hole, the excess soil is carried away. This method can greatly improve the drilling efficiency;

[0046] After drilling to the specified depth, the air passage is ventilated, and the first piston rod moves downward to close the lower cutting water opening valve. The water in the water passage and the air in the air passage enter the water nozzles and air nozzles on both sides of the drill body respectively. At this time, the pressure is concentrated on the water nozzles and air nozzles to achieve high-pressure water and gas cutting;

[0047] Then the drill bit starts to move upward, and water enters the oil cylinder. As the water pressure continues to increase, the second piston rod starts to move downward. After the piston extends, the transmission shaft cooperating with it drives the rack to move downward. The gear cooperating with the rack rotates along the axis and opens the blades. The three groups of blades open outward simultaneously. The greater the water pressure, the greater the opening angle of the blades. The opened blades can make the water fully stir and mix with the soil to prevent quality accidents caused by uneven strength.

[0048] The above are the embodiments provided by this application and are not used to limit this application. Although this application has been described in detail with reference to the embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. However, any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of this application shall be included within the protection scope of this application.

Claims

1. A three-in-one drill bit for jet grouting pile construction, characterized in that: It includes a drill body in the shape of a rod, with an air channel and a water channel provided inside, and a cutting head provided at the head of the drill body; The drill body includes a first pressure execution assembly, a second pressure execution assembly and a third pressure execution assembly; The first pressure actuator assembly includes a first piston rod, a lower cutting water opening valve and a cutting nozzle; The second pressure execution assembly includes a water nozzle and an air nozzle disposed on both sides of the drill body; The third pressure actuator assembly includes an oil cylinder, a second piston rod, a transmission shaft, a rack, a gear and a blade; When drilling the pilot hole, water flows through the water channel, the lower cutting water start valve opens, and the water in the water channel enters the cutting nozzle; During cutting, the air channel is ventilated, the first piston rod moves downward, the lower cutting water opening valve is closed, and the water in the water channel and the air in the air channel enter the water channel nozzle and the air channel nozzle on both sides of the drill body respectively, realizing high-pressure water and air cutting; When expanding the hole, water in the water channel enters the oil cylinder, the second piston rod moves downward, the transmission shaft matched with it drives the rack downward, the rack drives the gear to rotate and open the blades to achieve hole expansion.

2. A three-in-one drill bit for jet grouting pile construction according to claim 1, characterized in that: It also includes a butterfly spring, which is arranged at the lower part of the second piston rod and is used for retracting the blades.

3. A three-in-one drill bit for jet grouting pile construction according to claim 1, characterized in that: The utility model also comprises a guide spline which is embedded between the butterfly spring and the transmission shaft.

4. A three-in-one drill bit for jet grouting pile construction according to claim 1, characterized in that: A pressure sensor is provided in the drill body, and the pressure sensor is used to sense the pressure of water and gas in the drill bit.

5. A three-in-one drill bit for jet grouting pile construction according to claim 1, characterized in that: A displacement sensor is arranged in the drill body, and the displacement sensor is used to sense the opening angle of the blade.

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