A closed hole device and method for a concrete member

Abstract

The application discloses a closed hole opening device and a hole opening method for a concrete member, and belongs to the field of building engineering. The hole opening device comprises a track, a head center shaft is slidably arranged on the track, a high-pressure water flow nozzle and a liquid nitrogen nozzle are arranged at the end of the head center shaft, and the head center shaft is driven to rotate by a first power device. The high-pressure water flow nozzle is connected with a water flow injection device, and the water flow injection device is used for providing water source and injection power for the high-pressure water flow nozzle. The liquid nitrogen nozzle is connected with a liquid nitrogen injection device, and the liquid nitrogen injection device is used for providing liquid nitrogen and injection power for the liquid nitrogen nozzle. The high-pressure water flow nozzle replaces the traditional vibration and impact hole opening and is matched with the liquid nitrogen nozzle. The liquid nitrogen is injected to cause the cold brittleness of the concrete at the hole opening front edge and the significant material property reduction of the surrounding concrete. On one hand, the hole opening difficulty is reduced, and on the other hand, the smooth side wall can be formed, the hole opening shape is ensured, and other parts of the concrete member are prevented from being damaged.

Description

Technical Field

[0001] This invention belongs to the field of building engineering technology, and specifically relates to a closed-type opening device and opening method for concrete components. Background Technology

[0002] To reinforce and renovate buildings, numerous openings need to be made in concrete components to accommodate reinforcing bars or steel plates, thereby increasing the structural load-bearing capacity. Openings are also necessary when installing pipes, wiring, and other facilities. In certain scenarios, equipment or decorative items need to be installed on concrete components, and these openings facilitate the installation and securing of such equipment and decorations.

[0003] Currently, the common method for drilling holes in concrete components is through manual drilling using impact drills. Impact drills require different sized drill bits to accommodate varying hole sizes, making the process cumbersome, time-consuming, and labor-intensive. Because impact drills operate by vibrating and punching, the drilling process can cause concrete to slough off around the hole, resulting in additional damage and potentially rendering the entire concrete component unusable. Furthermore, it generates significant dust pollution and creates continuous, intense noise pollution during construction. The high cost of labor further contributes to the high overall cost of drilling. Summary of the Invention

[0004] This invention provides a closed-loop hole-opening device and method for concrete components. The hole-opening process is automated, saving labor and reducing costs; because all hole-opening devices are enclosed in isolation sleeves, there is no dust or noise pollution, resulting in high environmental performance; the method of combining liquid nitrogen spraying and high-pressure water flow does not damage the hole wall at the required hole location or the surrounding concrete.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A closed-type opening device for concrete components includes a track on which a head central shaft is slidably mounted. A high-pressure water nozzle and a liquid nitrogen nozzle are mounted at the end of the head central shaft. The head central shaft is driven to rotate by a first power device. The high-pressure water nozzle is connected to a water jetting device, which provides a water source and jetting power to the high-pressure water nozzle. The liquid nitrogen nozzle is also connected to a liquid nitrogen jetting device, which provides liquid nitrogen and jetting power to the liquid nitrogen nozzle.

[0007] Furthermore, the track is a variable diameter track, and the outline of the variable diameter track is an Archimedean spiral.

[0008] Furthermore, the head center axis is slidably connected to the track via a slider platform. The track has an annular mounting groove, and a drive gear and a transmission gear are respectively installed at both ends of the mounting groove. Both the drive gear and the transmission gear mesh with the chain. The slider platform is fixedly connected to the inner side of the chain.

[0009] Furthermore, an electromagnetic probe and a ranging probe are installed on the central axis of the head. The electromagnetic probe is used to detect reinforcing bars, and the ranging probe is used to measure the depth of the opening.

[0010] Furthermore, a ranging probe is mounted on the central axis of the head, which is used to measure the depth of the opening.

[0011] Furthermore, the container is located within the sleeve.

[0012] Furthermore, a vacuum pump is also installed, which is used to pump concrete debris and wastewater from inside the sleeve into a debris and wastewater collection tank.

[0013] Furthermore, a sound insulation layer is installed on the outside of the sleeve.

[0014] A closed-loop opening method for a concrete component based on the above-mentioned opening device includes the following steps:

[0015] Step 1: Install the hole-opening device at the location where a hole needs to be opened in the concrete component;

[0016] Step 2: Set the preset opening size and opening depth;

[0017] Step 3: Drive the head central shaft to rotate, and first make the liquid nitrogen nozzle start spraying liquid nitrogen. After a set time, make the high-pressure water nozzle spray high-pressure water onto the wall. The liquid nitrogen causes the concrete to become brittle, which reduces the strength of the concrete. The high-pressure water cuts the concrete to make a hole. At the same time, the slider platform drives the head central shaft to the preset hole size position, and the variable diameter track starts to rotate.

[0018] Step 4: Once the preset opening depth is reached, turn off the high-pressure water nozzle and the liquid nitrogen nozzle, and simultaneously stop the rotation of the head center shaft and the variable diameter track.

[0019] Furthermore, step 3 includes the following steps:

[0020] The head center axis starts to rotate, and first controls the three-way liquid nitrogen valve (32) in the liquid nitrogen injection device to spray liquid nitrogen through the liquid nitrogen nozzle. After the liquid nitrogen injection time reaches the set time, the three-way water valve in the water jet device is controlled to spray water through the high-pressure water jet nozzle to perform the hole opening operation.

[0021] At the same time, the variable diameter track begins to rotate;

[0022] Simultaneously, the head's central axis moves along a variable-diameter track, including the following steps:

[0023] When the drive slider platform moves the head center axis along the variable diameter track to 1 / 3 of the preset hole radius position, the slider platform stops moving. At this time, the high-pressure water nozzle and liquid nitrogen nozzle continue to operate until the hole depth reaches the predetermined opening depth.

[0024] The drive slider platform moves the head center axis along the variable diameter track to 2 / 3 of the preset hole radius position. The slider platform stops moving. At this time, the high-pressure water nozzle and liquid nitrogen nozzle continue to operate until the hole depth reaches the predetermined opening depth.

[0025] This process continues until the drive slider platform moves the head center axis along the variable diameter track to the preset hole radius position and performs drilling, until the hole depth reaches the predetermined drilling depth.

[0026] Compared with the prior art, the present invention has at least the following beneficial technical effects:

[0027] The device provided by this invention includes a high-pressure water jet nozzle and a liquid nitrogen nozzle. The high-pressure water jet nozzle replaces the traditional vibratory punching method for opening holes, and is combined with a liquid nitrogen nozzle. The liquid nitrogen spray causes the concrete at the leading edge of the hole to become brittle and significantly reduces the material properties of the surrounding concrete. In this way, on the one hand, the difficulty of opening holes is reduced, and on the other hand, a smooth sidewall can be formed to ensure the shape of the hole and avoid damage to other parts of the concrete component.

[0028] Furthermore, the opening device described in this invention employs an Archimedean spiral track to achieve openings of different diameters. On one hand, compared to traditional circular tracks, the natural frequency of a spiral track is higher. This means that at the same speed, the centrifugal force experienced by the central axis of the head and each nozzle and probe as it moves along the spiral track is smaller, improving the stability and safety of the device's operation. On the other hand, compared to other spiral tracks, the Archimedean spiral track maintains a more stable state during movement and has the advantages of saving space and reducing the size of the device.

[0029] Furthermore, the use of gear and chain drive makes the structure more stable. The movement of the slider platform is driven by gears, which is simpler and more convenient to control compared to automatic slider operation.

[0030] Furthermore, electromagnetic probes and distance measuring probes are installed next to the high-pressure water jet nozzles and liquid nitrogen nozzles. The electromagnetic probes effectively prevent damage to the reinforcing steel in the concrete during the drilling process, while the distance measuring probes can preset the drilling depth, replacing manual drilling and effectively avoiding the phenomenon of uncontrollable drilling depth.

[0031] Furthermore, this drilling device uses automated drilling instead of manual drilling, improving safety and reducing labor costs. It can also be connected to a computer or mobile device, making it easy to operate and install, saving time and labor.

[0032] Furthermore, the opening device uses a vacuum sealing connection to the concrete component, which effectively reduces noise and dust generated during operation compared to ordinary bolt connections, thus having a higher environmental protection capability.

[0033] Furthermore, the controller can be connected to a computer or mobile phone for convenient operation and control of the drilling process.

[0034] The hole-opening method provided by this invention uses liquid nitrogen to cause cold brittleness in concrete, thereby reducing the strength of the concrete. This allows high-pressure water flow to cut the concrete more easily to open the hole without damaging the hole wall or the surrounding concrete, thus avoiding damage to the concrete component during the hole-opening process. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the device of the present invention installed on a concrete component;

[0036] Figure 2a This is a schematic diagram of the device of the present invention;

[0037] Figure 2b yes Figure 2a A magnified view of a portion of the image;

[0038] Figure 3 This is a schematic diagram of the water jet device of the present invention;

[0039] Figure 4 This is a mathematical model diagram of the track of the device of the present invention;

[0040] Figure 5 This is a schematic diagram of the liquid nitrogen injection device of the present invention;

[0041] Figure 6 This is a schematic diagram of the two central axes of the device of the present invention.

[0042] Figure 7 This is a schematic diagram of the track cross-section of the device of the present invention.

[0043] In the attached diagram: 1. Concrete component; 2. Opening range; 3. Controller; 4. Sleeve; 5. External power supply; 6. Debris and wastewater collection tank; 7. Vacuum pump; 8. Expansion bolt; 9. Sealing ring; 10. High-pressure water nozzle; 11. Sealing cylinder; 12. Electromagnetic probe; 13. Distance measuring probe; 14. Y-shaped hose; 15. Liquid nitrogen nozzle; 16. Spiral track; 17. Head center axis; 18. Container box; 19. Track center axis; 20. Water supply device 22. Filter; 23. Water pump; 24. First accumulator; 25. Three-way water valve; 26. Water nozzle; 27. First hydraulic device; 28. First booster; 29. ​​Liquid nitrogen storage tank; 30. Liquid nitrogen pump; 31. Second accumulator; 32. Three-way liquid nitrogen valve; 33. Liquid nitrogen nozzle; 34. Second hydraulic device; 35. Second booster; 36. Sliding platform; 37. Chain; 38. Transmission gear; 39. Drive gear; 40. Mounting slot. Detailed Implementation

[0044] To make the objectives and technical solutions of this invention clearer and easier to understand, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. The specific embodiments described herein are for illustrative purposes only and are not intended to limit the invention.

[0045] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more. In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0046] Example 1

[0047] Reference Figure 1 and Figure 2a , Figure 2b and Figure 6 and Figure 7 A closed-type opening device for concrete components includes a controller 3, a sleeve 4, an external power supply 5, a debris and wastewater collection tank 6, a vacuum pump 7, expansion bolts 8, a sealing ring 9, a high-pressure water jet nozzle 10, a sealing cylinder 11, an electromagnetic probe 12, a distance measuring probe 13, a Y-shaped hose 14, a liquid nitrogen nozzle 15, a spiral track 16, a head central shaft 17, a holding box 18, a track central shaft 19, a mounting groove 40, a water jet device, a liquid nitrogen jet device, a gear chain transmission structure, a first motor, a second motor, and a third motor. Figure 1 2 represents the opening range 2. This opening device uses high-pressure jet water flow to break up concrete for opening.

[0048] Sleeve 4 is located on the outermost side of the opening device, serving to protect the structural safety of the device. Sealing cylinder 11 is located inside sleeve 4. Since the opening device utilizes vacuum pump 7 to adhere to the concrete component, ensuring the sealing of the opening device is crucial. Therefore, sealing cylinder 11 is used to seal the components within it. The high-pressure water jet nozzle 10, electromagnetic probe 12, ranging probe 13, Y-shaped hose 14, liquid nitrogen nozzle 15, spiral track 16, head center shaft 17, container 18, track center shaft 19, water jet device, liquid nitrogen jet device, gear chain drive structure, slider platform 36, first motor, second motor, and third motor are all housed within sealing cylinder 11. Spiral track 16 does not directly contact sleeve 4 or sealing cylinder 11.

[0049] The first motor drives the track center shaft 19 to rotate, the second motor drives the head center shaft 17 to rotate, and the third motor drives the drive gear to rotate.

[0050] The external power supply 5 is used to provide electrical energy to the controller 3, vacuum pump 7, first motor, second motor, third motor, electromagnetic detection device, distance detection device, water supply device 20, filter 22, water pump 23, first accumulator 24, three-way water valve 25, water nozzle 26, first hydraulic device 27, first booster 28, liquid nitrogen storage device 29, liquid nitrogen pump 30, second accumulator 31, three-way liquid nitrogen valve 32, liquid nitrogen nozzle 33, second hydraulic device 34, and second booster 35.

[0051] A spiral track 16 is fixed on a central shaft 19. A mounting plate is located at the tail of the sealing cylinder 11, and the central shaft 19 is connected to the mounting plate via a bearing. A sliding groove is provided on the spiral track 16, in which a slider platform 36 is slidably mounted. A head central shaft 17 is mounted on the slider platform 36 and can rotate relative to the slider platform 36. Mounting grooves 40 are provided on both sides of the sliding groove, and these grooves are connected to form an annular mounting groove 40. A drive gear 39 is mounted at the beginning of the mounting groove 40, and a transmission gear 38 is mounted at the end. The drive gear 39 and transmission gear 38 can rotate relative to the spiral track 16. A closed, freely rotating chain 37 is also provided in the mounting groove 40. The chain 37 meshes with the drive gear 39 and transmission gear 38. The transmission gear 38, drive gear 39, and chain 37 form a gear chain transmission structure. The structure of the spiral track 16 ensures that the chain 37 does not fall off while allowing for unrestricted chain rotation. The slider platform 36 is fixedly connected to the inner side of the chain 37 and does not contact the outer side of the chain 37. Its structural form is as follows. Figure 7 A third electric motor is installed at the drive gear 39. The third electric motor drives the drive gear 39 to rotate via a transmission shaft. The drive gear 39 drives the chain 37 and the transmission gear 38 to rotate, thereby moving the slider platform 36 along the spiral track 16. The transmission gear 38 mainly transmits power. The positions of the transmission gear 38 and the drive gear 39 are as follows... Figure 2a As shown. The head central shaft 17 is connected to the high-pressure water nozzle 10, liquid nitrogen nozzle 15, electromagnetic probe 12, and ranging probe 13 via a container 18. The high-pressure water nozzle 10 is located outside the liquid nitrogen nozzle 15. The two nozzles and two probes are mounted on the container 18, with part of them inside the container 18 and part extending out of it. The container 18 is tightly connected to the head central shaft 17. When the head central shaft 17 rotates, it drives the container 18 to rotate as well, thereby causing the two nozzles and two probes to rotate as well. The connection method is as follows. Figure 7 As shown.

[0052] The container 18 is fixedly connected to the head central shaft 17. The diameter of the opening is controlled by adjusting the number of rotations of the drive gear 39. During the opening process, in order to continuously monitor the opening status and understand the opening progress, two probes and two nozzles rotate with the head central shaft 17. At the same time, to control the opening size, the spiral track 16 also rotates slowly, with its rotation speed controlled between 1 revolution per 3 seconds and 1 revolution per second. The rotation of the head central shaft 17 is driven by a second motor, and the rotation of the track central shaft 19 is driven by a first motor. The motor of the head central shaft is placed inside the container 18, and the motor of the track central shaft 19 is placed inside the sealing cylinder 11.

[0053] The high-pressure water nozzle 10 is connected to a water jet device that provides high-pressure water. The principle of the water jet device is as follows: Figure 3 As shown. A filter 22 is installed at the outlet of the water supply device 20, which is connected to the inlet of the water pump 23 through a pipe. The outlet of the water pump 23 is connected to the first accumulator 24 through a water pipe. The first accumulator 24 is connected to the left inlet of the three-way water valve 25 through a pipe. The right outlet of the three-way water valve 25 is connected to the water nozzle 26 through a pipe. The water nozzle 26 is connected to the high-pressure water jet head 10. The first booster 28 is connected to the first hydraulic device 27 through a water pipe. The first hydraulic device 27 is connected to the lower hydraulic port of the three-way water valve 25 through a pipe. The controller 3 is connected to the three-way water valve 25 through a line. When the electromagnetic detection device detects the reinforcing bar or the distance detection device detects that the predetermined drilling depth has been reached, the two devices will feed back signals to the controller 3. The controller 3 controls the three-way water valve 25 to close, thereby stopping the water jet.

[0054] The spiral track 16 adopts the shape of an Archimedean spiral, with the mathematical expression r = (25 / π) *θ. The maximum radius of the designed hole is 50mm, and the mathematical model of its track is as follows: Figure 4 As shown.

[0055] A liquid nitrogen nozzle 15 is installed next to the high-pressure water jet nozzle 10. The liquid nitrogen nozzle 15 sprays liquid nitrogen, causing the concrete at the leading edge of the opening to become brittle and significantly reducing its material properties compared to the surrounding concrete. This reduces the difficulty of drilling and creates a smooth sidewall, ensuring the opening shape. The liquid nitrogen nozzle 15 is connected to a liquid nitrogen injection device that provides liquid nitrogen and injection pressure. The principle of the liquid nitrogen injection device is as follows... Figure 5 As shown.

[0056] The liquid nitrogen storage tank 29 is connected to the inlet of the liquid nitrogen pump 30 via a pipe. The outlet of the liquid nitrogen pump 30 is connected to the second accumulator 31 via a water pipe. The second accumulator 31 is connected to the left nitrogen inlet of the three-way liquid nitrogen valve 32 via a pipe. The right nitrogen outlet of the three-way liquid nitrogen valve 32 is connected to the liquid nitrogen nozzle 33 via a pipe. The liquid nitrogen nozzle 33 is connected to the liquid nitrogen spray head 15. The second booster 35 is connected to the second hydraulic device 34 via a pipe. The second hydraulic device 34 is connected to the lower hydraulic port of the three-way liquid nitrogen valve 32 via a pipe. The controller 3 is connected to the three-way liquid nitrogen valve 32 via a wiring connection. When the electromagnetic detection device detects a rebar or the ranging detection device detects that the predetermined drilling depth has been reached, both devices send signals back to the controller 3. The controller 3 then controls the three-way liquid nitrogen valve 32 to stop the liquid nitrogen injection.

[0057] An electromagnetic probe 12 is installed next to the high-pressure water jet nozzle 10. While the high-pressure water jet breaks up the concrete, the electromagnetic probe 12 emits electromagnetic waves to detect whether reinforcing steel is exposed at the leading edge of the high-pressure water jet. If reinforcing steel is detected, the drilling stops and an alarm sounds. The electromagnetic detection device uses a wall detector, and the electromagnetic probe is part of the wall detector.

[0058] A ranging probe 13 is installed next to the high-pressure water jet nozzle 10, which can detect the depth of the opening in real time. Based on the ranging probe 13, the opening depth can be set by the controller 3. After the opening depth is set, the opening device can automatically complete the opening, which has a significant improvement in efficiency and accuracy compared to the current manual drilling. The distance detection device uses a FOGO laser rangefinder, and the ranging probe is part of the FOGO laser rangefinder.

[0059] The controller 3 receives and processes feedback information from the wall detector and FOGO laser rangefinder in real time; and controls the water nozzle and liquid nitrogen nozzle to start and stop working; at the same time, the controller 3 is connected to a Bluetooth chip, through which it can connect to a computer or mobile phone to provide real-time feedback on the drilling progress to the construction party.

[0060] The sleeve 4 is made of sound-insulating material or has a sound-insulating layer, which has a sound insulation effect; the concrete debris and noise caused by the opening are shielded by the sleeve, which has a good environmental protection effect.

[0061] A vacuum-operated exhaust port is provided inside the sealed cylinder 11. This exhaust port connects to the first interface of a Y-shaped hose 14, and the second interface of the Y-shaped hose 14 connects to the waste collection bin. The vacuum source is connected to the third interface of the Y-shaped hose 14 using a quick-connect coupling. In this connection method, one end of the Y-shaped hose 14 is equipped with a quick-connect plug, while the vacuum source has a corresponding connector socket. By inserting the plug into the socket and rotating it to lock, the Y-shaped hose 14 and the vacuum source can be securely connected. This connection method is quick and convenient, suitable for applications requiring frequent replacement and disassembly.

[0062] The end of sleeve 4 is aligned with the end of sealing cylinder 11. The positions of high-pressure water nozzle 10, liquid nitrogen nozzle 15, electromagnetic probe 12, and ranging probe 13 should lag behind the end of sleeve. The end of sleeve 4 is first fixed with bolts, and then installed on the surface of the concrete component by vacuum adsorption connection. A sealing ring 9 is provided on the contact surface between sleeve 4 and concrete to ensure the sealing between the device and concrete; expansion bolts 8 are used, and the expansion bolt connection will not affect the structure or vacuum connection, and it has high strength and is easy to install.

[0063] The water jetting device, liquid nitrogen jetting device, electromagnetic detection device, and distance detection device are all installed in the container 18.

[0064] Preferably, the water source and liquid nitrogen source are also placed in the container 18.

[0065] Figure 3 and Figure 5 All controllers mentioned are controller 3.

[0066] Example 2

[0067] This embodiment provides a method for drilling holes in concrete components using the above-mentioned hole-drilling device, including the following steps:

[0068] Step 1: The worker holds the drilling device and aligns it with the location where a hole needs to be drilled in the concrete component, specifically aligning the end of the track closest to the center with the center of the hole. Using a bolt gun, expansion bolts are driven into the pre-drilled bolt holes in the concrete component to secure the drilling device. After securing the device, an external power supply 5 is connected. Then, the vacuum pump 7 is started to firmly connect the drilling device to the concrete component 1.

[0069] Step 2: Ensure that the water supply unit 20 is full of water and that the liquid nitrogen storage unit 29 is adequately filled with liquid nitrogen.

[0070] Step 3: Connect the controller to the computer or mobile phone, and adjust the preset opening size and opening depth on the computer or mobile phone (or you can do this directly on the device's controller).

[0071] Step 4: Start the device. After the switch is turned on, the controller 3 controls the second motor to start working, driving the head center shaft 17 to start rotating, and controls the three-way liquid nitrogen valve 32 in the liquid nitrogen injection device to open, allowing liquid nitrogen to be sprayed through the liquid nitrogen nozzle 15. After 2-3 seconds of liquid nitrogen spraying, the controller 3 then controls the three-way water valve 25 in the water jet device to open, allowing water to be sprayed through the high-pressure water jet nozzle 10. The liquid nitrogen causes the concrete to become brittle, thereby reducing the concrete strength. The high-pressure water jet cuts through the concrete to create a hole; the water flow velocity of the high-pressure water jet nozzle 10 is 1000-4000 m / s. At the same time, the first motor is controlled to start working, causing the spiral track 16 to start rotating. Driving the head center shaft to rotate ensures that while the high-pressure water jet nozzle 10 is creating a hole, the liquid nitrogen nozzle 15 sprays liquid nitrogen in time to cause the concrete at the hole location to become brittle, and also ensures that the electromagnetic probe 12 can detect whether there is exposed rebar in time, and that the ranging probe 13 can detect the depth of the hole. The head central axis 17 moves outward along the spiral track 16, and its working process is divided into three parts.

[0072] In the first step, the controller 3 controls the third motor to start rotating, which drives the drive gear to rotate. The drive gear drives the chain to rotate. When the chain drives the head center shaft 17 to 1 / 3 of the preset hole radius position through the slider platform 36, the third motor stops rotating. The high-pressure water nozzle 10 and liquid nitrogen nozzle 15 continue to operate. The electromagnetic detector and distance detector work synchronously and feed back the measured signals to the controller. When the rebar or the hole depth has reached the preset hole depth, the second step is executed.

[0073] The second step is that the controller 3 controls the third motor to start working, driving the slider platform 36 to reach 2 / 3 of the preset opening radius. The third motor stops rotating, and the electromagnetic detector and distance detector work synchronously and feed back the detected signals to the controller. When the detection of the reinforcing bar or the opening depth has reached the preset opening depth, the third step is executed.

[0074] Third, controller 3 controls the third motor to start working, driving the slider platform 36 to the preset opening radius position. The third motor stops rotating. As the head center axis 17 moves outward along the spiral track 16, the high-pressure water jet nozzle 10 and liquid nitrogen jet nozzle 15 continue to work. Liquid nitrogen causes the concrete to become brittle, thereby reducing the strength of the concrete. The high-pressure water jet cuts the concrete to make the opening.

[0075] The concrete debris and wastewater generated in the above three steps are pumped into a debris and wastewater collection tank by a vacuum pump. During the drilling process, two nozzles and two probes rotate to ensure that drilling and detection occur simultaneously. When a reinforcing bar is detected or the preset drilling depth is reached, these two devices send signals back to controller 3. Controller 3 controls the three-way water valve 25 to stop the water flow and simultaneously controls the three-way liquid nitrogen valve 32 to stop the liquid nitrogen flow. At the same time, it controls the second motor and the first motor to stop rotating, and then controls the third motor to rotate to drive the slider platform back to the initial position. When the slider platform reaches the initial position, the third motor stops working and the vacuum pump is turned off.

[0076] Step 5: First, disconnect the power supply, then remove the expansion screws and take the device off. The drilling work is now complete.

[0077] The above description is merely illustrative of the technical concept of this invention and should not be construed as limiting the scope of protection of this invention. Any modifications made to the technical solution based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. A closed-type opening device for concrete components, characterized in that, Includes a track on which a head central shaft (17) is slidably mounted. A high-pressure water jet nozzle (10) and a liquid nitrogen nozzle (15) are mounted at the end of the head central shaft (17). The head central shaft (17) is driven to rotate by a first power device. The high-pressure water jet nozzle (10) is connected to the water jet device, which provides water source and jet power to the high-pressure water jet nozzle (10); the liquid nitrogen nozzle (15) is connected to the liquid nitrogen jet device, which provides liquid nitrogen and jet power to the liquid nitrogen nozzle (15). The track is a variable diameter track, and the outline of the variable diameter track is an Archimedean spiral; the track is fixed on the track center shaft (19), and the first motor drives the track center shaft (19) to rotate; The head center shaft (17) is slidably connected to the track via a slider platform (36). The track has an annular mounting groove (40). A drive gear (39) and a transmission gear (38) are respectively installed at both ends of the mounting groove (40). Both the drive gear (39) and the transmission gear (38) mesh with the chain (37). The slider platform (36) is fixedly connected to the inner side of the chain (37).

2. The closed-type opening device for concrete components according to claim 1, characterized in that, An electromagnetic probe (12) and a distance measuring probe (13) are installed on the central shaft (17) of the head. The electromagnetic probe (12) is used to detect the reinforcing bars, and the distance measuring probe (13) is used to measure the depth of the opening.

3. A closed-type opening device for concrete components according to claim 1, characterized in that, A ranging probe (13) is mounted on the central axis (17) of the head, and the ranging probe (13) is used to measure the depth of the opening.

4. A closed-type opening device for concrete components according to claim 1, characterized in that, The sleeve (4) is located on the outermost side of the opening device, and the container (18) is located inside the sleeve (4).

5. A closed-type opening device for concrete components according to claim 4, characterized in that, A vacuum pump (7) is also installed, which is used to pump concrete debris and wastewater from the sleeve (4) into the debris and wastewater collection tank (6).

6. A closed-type opening device for concrete components according to claim 5, characterized in that, The sleeve (4) is provided with a sound insulation layer.

7. A closed-loop opening method for a concrete component based on the opening device of claim 1, characterized in that, Includes the following steps: Step 1: Install the hole-opening device at the location where a hole needs to be opened in the concrete component; Step 2: Set the preset opening size and opening depth; Step 3: Drive the head central shaft (17) to rotate, and first make the liquid nitrogen nozzle (15) start spraying liquid nitrogen. After a set time, make the high-pressure water nozzle (10) spray high-pressure water onto the wall. Liquid nitrogen causes the concrete to become brittle, which in turn reduces the strength of the concrete. The high-pressure water cuts the concrete to make a hole. At the same time, the slider platform (36) drives the head central shaft (17) to reach the preset hole size position, and the variable diameter track starts to rotate. Step 4: When the preset opening depth is reached, close the high-pressure water nozzle (10) and the liquid nitrogen nozzle (15), and at the same time stop the rotation of the head center shaft (17) and the variable diameter track.

8. The closed-type opening method for a concrete component according to claim 7, characterized in that, Step 3 includes the following steps: The head center axis (17) starts to rotate, and first controls the three-way liquid nitrogen valve (32) in the liquid nitrogen injection device to spray liquid nitrogen through the liquid nitrogen nozzle (15). After the liquid nitrogen injection time reaches the set time, the three-way water valve (25) in the water jet device is controlled to spray water through the high-pressure water jet nozzle (10) to perform the hole opening operation. At the same time, the variable diameter track begins to rotate; Simultaneously, the head central axis (17) moves along the variable diameter track, including the following steps: When the drive slider platform (36) drives the head center shaft (17) to reach 1 / 3 of the preset hole radius position along the variable diameter track, the slider platform (36) stops moving. At this time, the high pressure water nozzle (10) and liquid nitrogen nozzle (15) continue to operate until the hole depth reaches the predetermined opening depth. The drive slider platform (36) drives the head center shaft (17) to reach 2 / 3 of the preset hole radius position along the variable diameter track. The slider platform (36) stops moving. At this time, the high-pressure water nozzle (10) and liquid nitrogen nozzle (15) continue to operate until the hole depth reaches the predetermined opening depth. This continues until the drive slider platform (36) drives the head center shaft (17) to reach the preset hole radius position along the variable diameter track and open the hole until the hole depth reaches the predetermined opening depth.

Images