A method of casting a cast-in-place pile and a casting apparatus for casting a cast-in-place pile

Abstract

The application discloses a pouring device for pouring a cast-in-situ bored pile and a pouring method of the cast-in-situ bored pile. The pouring device comprises a height detection device with a height position detector and a height measuring element, a discharging device and a controller. The discharging device comprises a hopper with a discharging channel, a material hammer and a material hammer releasing assembly. When the height position detector detects that the height does not reach a set first height value, the material hammer releasing assembly locks the material hammer, so that the material hammer is not in contact with the discharging channel. When the height position detector detects that the height reaches the set value, the controller controls the material hammer releasing assembly to release the lock on the material hammer. The material hammer releasing assembly and the height position detector are respectively connected to the controller in a signal control mode. The pouring method uses the above pouring device. The height detection and the discharging control are connected in a signal linkage mode through the controller, the material hammer is in contact with the discharging channel to limit discharging, and the construction quality of the pile foundation is improved.

Description

Technical Field

[0001] This invention relates to the field of bored pile construction technology, and in particular to a grouting device and a grouting method for bored piles. Background Technology

[0002] Drilled cast-in-place piles are a type of deep foundation formed by mechanically drilling holes, lowering a reinforcing cage, and underwater pouring of concrete. The manufacturing process mainly includes: first, drilling the designed pile hole in the foundation, using mud slurry to protect the hole wall during drilling to prevent collapse (filling the pile hole with mud slurry); then, lowering the reinforcing cage into the pile hole; finally, underwater concrete pouring through a tremie pipe, with the concrete gradually poured in and lifted upwards, replacing the mud slurry in the pile hole until the concrete level reaches the designed elevation, forming a complete pile structure.

[0003] In the aforementioned preparation process, precise control of the concrete pouring elevation and the associated concrete material feeding control are crucial for ensuring pile foundation quality and construction efficiency. However, in existing bored pile construction, elevation testing and concrete material feeding control are performed manually. Current elevation testing primarily uses a manual ruler insertion method to detect the concrete pouring elevation of bored piles. Workers insert a ruler into the pile hole and judge by feel whether the bottom of the ruler touches the concrete pouring surface, thus estimating the concrete level. While the manual ruler insertion method is simple and inexpensive, it suffers from significant reading errors due to variations in worker experience, compromising accuracy. Current material feeding control methods involve manually closing the feeding valve to stop feeding upon receiving elevation information. In this mode, the two crucial links of elevation control and concrete feeding are disconnected and lack effective and precise linkage. Failure to stop feeding promptly forces excess concrete from the hopper into the pile hole, causing the pile height to exceed the predetermined height, resulting in severe material waste and potentially requiring subsequent pile chiseling, thus affecting pile foundation quality. Summary of the Invention

[0004] In view of the above-mentioned problems, this invention overcomes at least one of them by proposing a grouting device and a grouting method for bored piles.

[0005] The technical solution adopted in this invention is as follows:

[0006] This application provides a grouting device for grouting bored piles, including an elevation detection device, a material feeding device, and a controller; The elevation detection device includes an elevation measuring element and an elevation position detector connected to the elevation measuring element. The elevation position detector is signal-connected to the controller. The elevation measuring element is used to sink into the soil slurry in the borehole. As concrete is poured, the surface of the concrete will contact the elevation measuring element and push the elevation measuring element upward so that the elevation measuring element can mark the elevation position. The elevation position detector is used to detect whether the elevation has reached the set height. The feeding device includes a hopper, a hammer, and a hammer release assembly connected to the hammer. The hammer release assembly is connected to the controller via signal control. The lower end of the hopper has a discharge channel communicating with the inside of the hopper. The hammer is used to contact and cooperate with the discharge channel to restrict the discharge of material. The discharge channel is connected to a guide tube, which is used to transfer the material in the hopper to the bottom of the borehole. When the elevation position detector detects that the elevation has not reached the set first height value, the hammer release component locks the hammer, preventing the hammer from contacting and engaging with the discharge channel; When the elevation position detector detects that the elevation has reached the set first height value, the elevation position detector transmits the arrival signal to the controller. The controller controls the hammer release assembly to release the hammer, so that the hammer contacts and engages with the discharge channel to restrict the discharge of material from the discharge channel.

[0007] This application marks the elevation position by setting an elevation measuring device that is sunk into the soil slurry in the borehole and can move upward as the concrete is poured. The elevation position detector and controller link the elevation detection with the material feeding control. When the concrete pouring surface reaches the set height, the controller can control the material hammer release component to release the locking of the material hammer, so that the material hammer contacts the discharge channel to restrict the material discharge (instantly triggering the material hammer to cut off the discharge channel). This solves the problems of information transmission lag and untimely closing of the material feeding valve in manual operation, effectively reduces the amount of concrete over-pouring caused by the delay in stopping the material feeding, reduces material waste and subsequent pile chiseling costs, and at the same time facilitates ensuring that the pile top elevation meets the design requirements, thus improving the quality of pile foundation construction.

[0008] In an optional embodiment, the elevation measuring component includes a suspension member and a movable measuring assembly. The suspension member is used to be fixedly installed on a steel casing inside the borehole and is located at the borehole opening. The movable measuring component includes a vertically arranged movable rod and a concrete floating component fixedly connected to the bottom of the movable rod. The movable rod includes a length-adjustable structure. The upper part of the movable rod passes through the suspension component. The concrete floating component is used to sink into the soil slurry and contact the liquid surface of the concrete, and under the pushing action of the liquid surface of the concrete, it drives the movable rod to move vertically upward. The elevation position detector is used to detect the horizontal position height of the movable rod. When the horizontal position height of the movable rod reaches the set value, the elevation reaches the set height.

[0009] In an optional embodiment, the elevation position detector includes a distance sensor and a position detection mounting bracket, the position detection mounting bracket being fixedly mounted on a steel casing inside the borehole, the movable rod having an end protruding from the soil and mud, and the elevation position detector being mounted on the position detection mounting bracket and located directly above the movable rod; The distance sensor is connected to the controller via a signal. The distance sensor is used to detect the distance between the movable rod and the distance sensor, and transmits the detected distance signal to the controller.

[0010] In an optional embodiment, the hammer is configured to contact and engage with the side of the discharge channel away from the guide tube; It also includes a material cutting device, which is connected to the controller via signal control. The material cutting device is disposed on the discharge channel and located on the side of the discharge channel near the guide tube. The material cutting device is used to reduce the discharge diameter of the discharge channel or to stop the discharge of the discharge channel. When the elevation position detector detects that the elevation has not reached the set second height value, and the second height value is less than the first height value, the material cutting device does not reduce the discharge diameter of the discharge channel; When the elevation position detector detects that the elevation has reached the set second height value, the controller controls the material cutting device to reduce the diameter of the discharge channel to slow down the material discharge speed.

[0011] In an optional embodiment, the material cutting device includes a material insertion plate and an insertion plate pushing assembly connected to the material insertion plate; The discharge channel has a movable channel for inserting plates on its body wall. The inserting plates are inserted into the movable channel and can move along the movable channel toward or away from the central axis of the discharge channel. The insert plate pushing assembly is connected to the controller via signal control, and the insert plate pushing assembly is used to drive the material insert plate to move towards or away from the central axis of the discharge channel.

[0012] In an optional embodiment, the cross-section of the discharge channel is rectangular; The material insert plate is inserted at an angle into the movable channel of the insert plate; The material insert plate includes at least two, which are arranged opposite each other and in a "V" shape or funnel shape.

[0013] In an optional embodiment, the outer wall of the hammer that contacts and engages with the discharge channel is provided with a soft rubber buffer ring.

[0014] In an optional embodiment, the hammer includes a hammer rod and a hammer body connected together. The hammer body is located directly above the discharge channel and is used to contact and cooperate with the discharge channel to restrict the discharge of material. A pin groove is provided on the side wall of the hammer rod. The hammer release assembly includes a release frame and an electromagnetic locking pin mounted on the release frame. The electromagnetic locking pin is connected to the controller via signal control. The release frame is provided with a release channel. The hammer rod is movably disposed in the release channel. The pin of the electromagnetic locking pin extends into the release channel and engages with the pin groove on the side wall of the hammer rod to lift the hammer and prevent the hammer from contacting the discharge channel. When the elevation position detector detects that the elevation has reached the set first height value, the controller controls the pin of the electromagnetic locking pin to retract from the pin mating groove to release the material hammer. The material hammer falls under the action of gravity and contacts the discharge channel to restrict the discharge.

[0015] This application also provides a method for grouting bored piles, using grouting equipment for bored piles. The grouting equipment includes an elevation detection device, a feeding device, a cutting device, and a controller. The elevation detection device includes an elevation measuring element and an elevation position detector connected to the measuring element. The elevation position detector is signal-connected to the controller. The elevation measuring element is used to sink into the soil slurry in the borehole. As the concrete is poured, the surface of the concrete will contact the elevation measuring element and push it upward so that the elevation measuring element can mark the elevation position. The feeding device includes a hopper, a hammer, and a hammer release component connected to the hammer. The hammer release component is signal-controlled connected to the controller. The lower end of the hopper has a discharge channel communicating with the inside of the hopper. The discharge channel is connected to a guide tube. The hammer contacts and cooperates with the side of the discharge channel away from the guide tube to restrict the discharge of material from the discharge channel. The cutting device is signal-controlled connected to the controller and is disposed on the discharge channel. The infusion method includes the following steps: During the initial pouring stage, the material hammer release assembly is controlled to lock the material hammer, preventing it from contacting the discharge channel. The material cutting device does not reduce the discharge diameter of the discharge channel. The material falls to the bottom of the borehole through the discharge channel and the guide tube. During the pouring process, the elevation position detector detects the elevation position in real time and transmits the detection signal to the controller and compares it with the reference value. The reference value of the controller includes a first height value and a second height value, where the first height value is greater than the second height value. The controller continues to receive the detection signal and make a judgment. When the controller determines that the elevation has reached the set second height value based on the detection signal, the controller controls the material cutting device to operate to reduce the diameter of the material discharge channel, thereby slowing down the material discharge speed. The controller continues to receive the detection signal and make a judgment. When the controller determines that the elevation has reached the set first height value based on the detection signal, the controller controls the hammer release assembly to release the hammer, so that the hammer contacts and engages with the discharge channel to restrict the discharge.

[0016] In an optional embodiment, the elevation measuring component includes a suspension member and a movable measuring assembly. The suspension member is used to be fixedly installed on a steel casing inside the borehole. The movable measuring assembly includes a vertically arranged movable rod and a concrete floating component fixedly connected to the bottom of the movable rod. The upper part of the movable rod passes through the suspension member. The concrete floating component is used to sink into the mud slurry and contact the liquid surface of the concrete, and under the pushing action of the liquid surface of the concrete, it drives the movable rod to move vertically upward. The elevation position detector is used to detect the horizontal position height of the movable rod. When the controller controls the hammer release assembly to release the hammer, allowing the hammer to contact and engage with the discharge channel to restrict discharge, the elevation position detector continues to detect the distance between the movable rod and the distance sensor, and transmits the detected distance signal to the controller. When the elevation position detector detects that the distance between the movable rod and the distance sensor is less than the distance at the corresponding first height value, and the distance continues to decrease, the controller controls the material cutting device to stop the material from being discharged from the discharge channel.

[0017] The beneficial effects of this invention are: This application marks the elevation position by setting an elevation measuring element that is embedded in the soil slurry of the borehole and can move upward with the pouring of concrete, and links the elevation detection with the material feeding control through an elevation position detector and a controller. (1) The grouting equipment provided in this application uses an elevation position detector and a controller to link the elevation detection with the material feeding control. When the concrete grouting surface reaches the set height, the controller can control the material hammer release component to release the lock on the material hammer, so that the material hammer contacts and cooperates with the discharge channel to restrict the material feeding (instantly triggering the material hammer action to cut off the discharge channel). This solves the problems of information transmission delay and untimely closing of the material feeding valve in manual operation, effectively reduces the amount of concrete over-pouring caused by the delay in stopping the material feeding, reduces material waste and subsequent pile chiseling costs, and at the same time facilitates ensuring that the pile top elevation meets the design requirements and improves the quality of pile foundation construction.

[0018] Furthermore, the filling equipment of this application adds a material-cutting device below the material hammer in the discharge channel, and links the material-cutting device with a signal through the controller. It also sets two-stage height control nodes (a first height value and a second height value) during the filling process to form a two-stage control method of first throttling and then shutting off. This setting can extend the operating window from detecting the elevation to completely stopping the discharge, avoiding control lag or excessive impact caused by single-stage rapid closure, making the discharge termination process more stable and controllable, further improving the elevation control accuracy, and reducing overfilling. Simultaneously, the material-cutting device can perform a secondary shut-off of the discharge channel, forming a double-closing guarantee for the discharge.

[0019] Furthermore, the soft rubber buffer ring provided on the outer wall of the hammer in this application has the function of enhancing sealing performance and providing impact cushioning.

[0020] (2) The grouting equipment with a two-stage discharge control structure (material hammer and material cutting device) provided in this application is used to perform the grouting of bored piles, forming a two-stage control method of first throttling and then shutting off. This control method can extend the operation window from the detection of the elevation to the complete cessation of discharge, avoid the control lag or excessive impact caused by single-stage rapid closure, make the discharge termination process more stable and controllable, further improve the elevation control accuracy, and reduce the over-grouting amount. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the main structure of the grouting device in one embodiment of this application (initial grouting state). Figure 2 yes Figure 1 A magnified schematic diagram of the structure of part A in the diagram; Figure 3 yes Figure 1 A magnified schematic diagram of the partial structure of B in the diagram; Figure 4 yes Figure 1 A magnified schematic diagram of the structure of C in the middle; Figure 5This is a schematic diagram of the main structure of the injection equipment in one embodiment of this application (the material cutting device reduces the discharge port diameter). Figure 6 yes Figure 5 A magnified schematic diagram of the local structure of D; Figure 7 This is a schematic diagram of the main structure of the injection device in one embodiment of this application (with the hammer falling). Figure 8 yes Figure 7 A magnified schematic diagram of a portion of the structure of E; Figure 9 yes Figure 7 A magnified schematic diagram of the local structure of F; Figure 10 yes Figure 7 A magnified schematic diagram of a portion of the structure of G; Figure 11 This is a schematic diagram of the main structure of the injection equipment in one embodiment of this application (secondary cutting state of the cutting device). Figure 12 yes Figure 11 A magnified schematic diagram of the partial structure of H in the middle; Figure 13 This is a schematic diagram of the front view structure of the elevation detection device in one embodiment of this application; Figure 14 This is a top view of the elevation detection device in one embodiment of this application; Figure 15 This is a schematic diagram of the grouting method for bored piles in one embodiment of this application.

[0022] The labels for the attached figures are as follows: 1. Elevation detection device; 11. Movable measuring component; 111. Movable rod; 1111. First rod; 1112. Second rod; 1113. Fixing knob; 112. Concrete floating component; 1121. Support plate; 1122. Floating net; 113. Length adjustable structure; 114. End cap; 115. Marking support arm; 116. Adjusting knob; 12. Suspension component; 121. Suspension plate; 1211. Suspension groove; 122. Connecting ring; 1221. Opening; 1222. Pin; 13. Steel casing; 14. Alarm component; 2. Discharge device; 21. Hopper; 211. Discharge channel; 212. Center of discharge channel 1. Axis; 22. Hammer; 221. Hammer rod; 222. Hammer body; 223. Pin mating groove; 23. Hammer release assembly; 231. Release frame; 2311. Release channel; 232. Electromagnetic lock pin; 2321. Pin; 234. Elastic element; 235. Elastic element contact block; 24. Conduit; 25. Steel frame mesh; 3. Controller; 4. Elevation position detector; 41. Position detection mounting frame; 42. Position switch; 43. Distance sensor; 5. Cutting device; 51. Material insertion plate; 52. Insertion plate pushing assembly; 521. Telescopic end; 522. Fixed end; 53. Mounting plate; 531. Receiving channel; 532. Mounting groove. Detailed Implementation

[0023] The present invention will now be described in detail with reference to the accompanying drawings.

[0024] like Figures 1-14 As shown, this application provides a grouting device for grouting bored piles, including an elevation detection device 1, a material feeding device 2, and a controller 3; The elevation detection device 1 includes an elevation measuring element and an elevation position detector 4 connected to the elevation measuring element. The elevation position detector 4 is signal-connected to the controller 3. The elevation measuring element is used to sink into the soil mud in the borehole. As the concrete is poured, the surface of the concrete will contact the elevation measuring element and push the elevation measuring element to move upward so that the elevation measuring element can mark the elevation position. The elevation position detector 4 is used to detect whether the elevation has reached the set height. The feeding device 2 includes a hopper 21, a hammer 22, and a hammer release assembly 23 connected to the hammer 22. The hammer release assembly 23 is connected to the controller 3 via signal control. The lower end of the hopper 21 has a discharge channel 211 that communicates with the inside of the hopper 21. The hammer 22 is used to contact and cooperate with the discharge channel 211 to restrict the discharge of material. The discharge channel 211 is connected to a guide tube 24, which is used to transfer the material in the hopper 21 to the bottom of the borehole. When the elevation position detector 4 detects that the elevation has not reached the set first height value, the hammer release assembly 23 locks the hammer 22, so that the hammer 22 does not contact the discharge channel 211. When the elevation position detector 4 detects that the elevation has reached the set first height value, the elevation position detector 4 transmits the arrival signal to the controller 3. The controller 3 controls the hammer release assembly 23 to release the lock on the hammer 22, so that the hammer 22 contacts and engages with the discharge channel 211 to restrict the discharge of material from the discharge channel 211.

[0025] This application links elevation detection and material feeding control via a controller 3. When the concrete pouring surface reaches the set height, the controller 3 can control the material hammer release component 23 to release the lock on the material hammer 22, allowing the material hammer 22 to contact and cooperate with the discharge channel 211 to restrict material feeding (instantly triggering the material hammer 22 to cut off the discharge channel 211). This solves the problems of delayed information transmission and untimely closing of the material feeding valve in manual operation, effectively reducing the amount of over-pouring concrete caused by the delay in stopping material feeding, reducing material waste and subsequent pile chiseling costs, and at the same time, facilitating the assurance that the pile top elevation meets the design requirements and improving the quality of pile foundation construction.

[0026] In one embodiment, the controller 3 may be a PLC (Programmable Logic Controller) or an industrial microcontroller / embedded controller 3.

[0027] In one embodiment, the hammer 22 is used to contact and engage with the side of the discharge channel 211 away from the guide tube 24; Please refer to Figure 2 , Figure 6 and Figure 8 The filling equipment also includes a material cutting device 5, which is connected to the controller 3 by signal control. The material cutting device 5 is set on the discharge channel 211 and located on the side of the discharge channel 211 close to the guide tube 24. The material cutting device 5 is used to reduce the discharge diameter of the discharge channel 211 or to stop the discharge of the discharge channel 211. When the elevation position detector 4 detects that the elevation has not reached the set second height value, the second height value is less than the first height value, and the material cutting device 5 does not reduce the discharge diameter of the discharge channel 211; When the elevation position detector 4 detects that the elevation has reached the set second height value, the controller 3 controls the material cutting device 5 to reduce the discharge diameter of the discharge channel 211 to slow down the material discharge speed.

[0028] In actual use, the material can be concrete or cement slurry and other building materials.

[0029] When over-grouting is required, the second height value corresponds to the height of the bored pile reaching the design elevation, and the first height value corresponds to the height of the over-grouted pile reaching the design elevation. When over-grouting is not required, the first height value corresponds to the height of the bored pile reaching the design elevation.

[0030] This embodiment adds a material-cutting device 5 below the material hammer 22 in the discharge channel 211, and links the material-cutting device 5 to the controller 3 via signal linkage. It also sets two levels of height control nodes (first height value and second height value) during the pouring process to form a two-stage control method of first throttling and then shutting off: when the pouring surface reaches the second height value first, the controller 3 drives the material-cutting device 5 to reduce the diameter of the discharge channel 211, decreasing the material flow rate and buying time for subsequent complete closure; when the pouring surface continues to rise to the first height value, the controller 3 then drives the material hammer release assembly 23 to release the lock, allowing the material hammer 22 to contact and cooperate with the discharge channel 211 to achieve complete closure. This setting can extend the operating window from detecting the elevation to completely stopping the discharge, avoiding control lag or excessive impact caused by single-stage rapid closure, making the discharge termination process more stable and controllable, and further improving the elevation control accuracy.

[0031] Please refer to Figure 12 Meanwhile, the material cutting device 5 can also perform a secondary shut-off on the discharge channel 211, forming a double-closing guarantee. That is, the graded cooperation structure formed by the material cutting device 5 and the material hammer 22 ensures that the material supply can still be reliably cut off under abnormal conditions, avoiding the risk of over-pouring caused by continuous concrete pouring, and further improving the reliability of discharge control and the accuracy of pile top elevation.

[0032] In one embodiment, the material cutting device 5 includes a material insertion plate 51 and an insertion plate pushing assembly 52 connected to the material insertion plate 51; The wall of the discharge channel 211 is provided with a movable channel for inserting plates. The inserting plate 51 is inserted into the movable channel for inserting plates and can move along the movable channel for inserting plates toward or away from the central axis 212 of the discharge channel. The insert plate pushing assembly 52 is connected to the controller 3 by signal control. The insert plate pushing assembly 52 is used to drive the material insert plate 51 to move closer to or further away from the central axis 212 of the discharge channel.

[0033] Please refer to Figure 8 In one embodiment, the cross-section of the discharge channel is rectangular; The material insertion plate 51 is inclinedly inserted into the insertion plate movement channel; The material insert plate 51 includes at least two, which are arranged opposite each other and in a “V” shape or funnel shape.

[0034] In another embodiment, the material insert plate 51 is horizontally inserted into the insert plate movable channel (perpendicular to the axis of the insert plate movable channel). In this case, the cross-section of the discharge channel can be rectangular or circular.

[0035] Compared to the horizontal setting of the material insert plate 51, the inclined insertion of the material insert plate 51 can change the direction of the impact force of the concrete on the material insert plate 51, reduce the shear damage to the aggregate in the concrete, and also reduce the risk of wear and jamming of the material insert plate 51, making the flow of concrete more stable and reliable during semi-closed flow control.

[0036] In actual use, when the two material insert plates 51 move toward the central axis 212 of the discharge channel to reduce the discharge diameter of the discharge channel 211, the gap width formed between the two material insert plates 51 is greater than the outer diameter of the concrete aggregate, so as to prevent the concrete aggregate from getting stuck between the two material insert plates 51 and causing discharge blockage.

[0037] In one embodiment, the material cutting device 5 further includes a mounting plate 53, which is fixedly mounted on the outer wall of the hopper 21. The mounting plate 53 is provided with a receiving channel 531, which is inclined and is correspondingly arranged with and connected to the insert plate movable channel. The receiving channel 531 is used to receive the material insert plate 51 (when the material insert plate 51 is used to reduce the discharge diameter of the discharge channel 211, the material insert plate 51 extends out from the receiving channel 531). Mounting plate 53 is also provided with mounting groove 532 that communicates with receiving channel 531, and insert plate pushing assembly 52 is installed in mounting groove 532.

[0038] In one embodiment, the material cutting device 5 further includes a sealing ring (not shown in the figure). The sealing ring is located between the insert plate movable channel and the material insert plate 51. The outer ring of the sealing ring is fixed on the side wall of the movable channel. When the material insert plate 51 moves, the inner ring surface of the sealing ring always maintains contact with the material insert plate 51. The sealing ring is used to prevent material from overflowing from the insert plate movable channel of the discharge channel 211.

[0039] Please refer to Figure 8 and Figure 12 In one specific embodiment, the insert plate pushing assembly 52 includes an electric push rod, which is connected to the controller 3 by signal control. The fixed end 522 of the electric push rod is fixedly installed on the mounting plate 53, and the telescopic end 521 of the electric push rod is connected to the material insert plate 51. When the telescopic end 521 of the electric push rod extends or retracts, it drives the material insert plate 51 to move closer to or further away from the central axis 212 of the discharge channel.

[0040] In another specific embodiment, the insert plate pushing assembly 52 includes a cylinder, which is connected to the controller 3 by signal control. The fixed end 522 of the cylinder rod is fixedly installed on the mounting plate 53, and the telescopic end 521 of the cylinder is connected to the material insert plate 51. When the telescopic end 521 of the cylinder extends or retracts, it drives the material insert plate 51 to move closer to or further away from the central axis 212 of the discharge channel.

[0041] In one embodiment, the discharge channel 211 includes a discharge mating part and a discharge outlet connected to the discharge mating part. The discharge mating part contacts and engages with the material hammer 22 to restrict the discharge. The end of the discharge outlet away from the discharge mating part is connected to the guide tube 24. The material insert plate 51 is disposed in the discharge outlet.

[0042] In one embodiment, the hopper 21 is a pyramidal hopper 21 with a rectangular cross-section. The entire discharge channel 211 is a discharge channel with a rectangular cross-section. The conduit 24 has a circular cross-section. A transition pipe is provided between the discharge outlet of the discharge channel 211 and the conduit 24. The transition pipe is used for a smooth transition from the rectangular discharge channel 211 to the circular conduit 24.

[0043] In one embodiment, the feeding device 2 is positioned above the elevation detection device 1.

[0044] In one embodiment, the outer wall of the hammer 22 that contacts and engages with the discharge channel 211 is provided with a soft rubber buffer ring.

[0045] A soft rubber buffer ring (not shown in the figure) is installed on the outer wall of the hammer 22 that contacts and engages with the discharge channel 211. On one hand, when the hammer 22 falls and closes the discharge channel 211, the elastic deformation characteristics of the soft rubber buffer ring allow it to adapt to the aggregate in the concrete, ensuring a tight seal between the hammer 22 and the edge of the discharge port of the discharge channel 211. On the other hand, when the hammer 22 falls under gravity and contacts the discharge channel 211, the soft rubber buffer ring absorbs the impact energy generated by the falling hammer, preventing violent vibrations that could cause concrete to splash and protecting the equipment structure from impact damage. In other words, the soft rubber buffer ring provides both sealing and cushioning effects.

[0046] In one embodiment, the hammer 22 includes a hammer rod 221 and a hammer body 222 connected to each other. The hammer body 222 is located directly above the discharge channel 211. The hammer body 222 is used to contact and cooperate with the discharge channel 211 to restrict the discharge of material from the discharge channel. A pin groove 223 is provided on the side wall of the hammer rod 221. The hammer release assembly 23 includes a release frame 231 and an electromagnetic locking pin 232 mounted on the release frame 231. The electromagnetic locking pin 232 is connected to the controller 3 by signal control. The release frame 231 is provided with a release channel 2311. The hammer rod 221 is movably disposed in the release channel 2311. The pin 2321 of the electromagnetic locking pin 232 extends into the release channel 2311 and engages with the pin engagement groove 223 on the side wall of the hammer rod 221 to lift the hammer 22 and prevent the hammer 22 from contacting the discharge channel 211. When the elevation position detector 4 detects that the elevation has reached the set first height value, the controller 3 controls the pin 2321 of the electromagnetic locking pin 232 to retract from the pin mating groove 223 to release the hammer 22. The hammer 22 falls under the action of gravity and contacts the discharge channel 211 to restrict the discharge.

[0047] In one specific embodiment, the pin mating groove 223 includes a wedge-shaped guide portion to allow the pin 2321 of the electromagnetic locking pin 232 to extend into the pin mating groove 223.

[0048] Please refer to Figure 3 and Figure 9 In one embodiment, the hammer release assembly 23 further includes an elastic element 234 and an elastic element 234 contact block. The elastic element 234 contact block is disposed on the side wall of the hammer rod 221. The elastic element 234 is disposed between the release frame 231 and the elastic element 234 contact block. When the pin 2321 of the electromagnetic locking pin 232 extends into the release channel 2311 and engages with the pin engagement groove 223 on the side wall of the hammer rod 221, the elastic element 234 is compressed by the release frame 231 and the elastic element 234 contact block and is in a compressed state. When the pin 2321 of the electromagnetic locking pin 232 retracts from the pin mating groove 223 to release the hammer 22, the elastic element 234 returns to its natural state and applies a force to the hammer rod 221 (the contact block of the elastic element 234) to assist in pushing the hammer 22 to fall.

[0049] In one specific embodiment, the elastic element 234 is a compression spring.

[0050] In one specific embodiment, a lifting ring is provided at the end of the hammer rod 221 away from the hammer body 222 to facilitate the lifting and movement of the hammer 22 by the hook.

[0051] In one specific embodiment, a handle is also included. The handle is connected to the pin 2321 via a pull wire. When the electromagnetic lock pin 232 is stuck, the handle can be used to pull the pin 2321 to manually release the hammer 22.

[0052] In one specific embodiment, the cross-sectional dimension of the hammer 222 is larger than the cross-sectional dimension of the discharge channel 211 (discharge mating part) to ensure sealing. Specifically, the cross-sectional dimension of the hammer 222 is 1.1 to 1.2 times the cross-sectional dimension of the discharge channel 211 (discharge mating part) so that when the hammer 222 falls with a slight tilt, it can still block the discharge port of the discharge channel 211.

[0053] In actual use, the density of the hammer body 222 is greater than that of the material, and the density of the hammer body 222 is 2 to 3 times that of the material. There is a minimum gap distance of 300mm between the bottom surface of the hammer body 222 and the discharge channel 211.

[0054] In one specific embodiment, the discharge channel 211 is vertically arranged, and the axis of the discharge channel 211 coincides with the axis of the guide tube 24 to facilitate material discharge.

[0055] In one embodiment, a steel frame mesh channel 25 is provided above the discharge channel 211. The steel frame mesh channel 25 is coaxially arranged with the release channel 2311. The steel frame mesh channel 25 is used to cooperate with the release channel 2311 to guide the material hammer 22 to fall vertically.

[0056] In one specific embodiment, the steel frame mesh channel 25 has upper and lower openings 1221 and includes four vertical ribs and three horizontal ring ribs. The vertical ribs and horizontal ring ribs are arranged in a mesh pattern, and there is a 160mm spacing between adjacent vertical ribs and horizontal ring ribs. The distance between the steel frame mesh channel 25 and the outer edge of the hammer body 222 is 30mm.

[0057] Please refer to Figure 4 , Figure 10 and Figure 13 In one embodiment, the elevation measuring component includes a suspension member 12 and a movable measuring assembly 11. The suspension member 12 is used to be fixedly installed on the steel casing 13 inside the borehole and is located at the borehole opening. The active measuring component 11 includes a vertically arranged movable rod 111 and a concrete floating component 112 fixedly connected to the bottom of the movable rod 111. The movable rod 111 includes a length adjustable structure 113. The upper part of the movable rod 111 passes through the suspension component 12. The concrete floating component 112 is used to sink into the soil slurry and contact the liquid surface of the concrete, and under the pushing action of the concrete liquid surface, it drives the movable rod 111 to move vertically upward. The elevation position detector 4 is used to detect the horizontal position height of the movable rod 111. When the horizontal position height of the movable rod 111 reaches the set value, the elevation reaches the set height.

[0058] Please refer to Figure 4 and Figure 10 In one embodiment, the elevation position detector 4 includes a distance sensor 43 and a position detection mounting frame 41. The position detection mounting frame 41 is fixedly installed on the steel casing 13 inside the borehole. The movable rod 111 has an end protruding from the soil and mud. The elevation position detector 4 is installed on the position detection mounting frame 41 and is located directly above the movable rod 111. Distance sensor 43 is connected to controller 3. Distance sensor 43 is used to detect the distance between the movable rod 111 and the distance sensor 43, and transmits the detected distance signal to controller 3.

[0059] In one specific embodiment, the movable rod 111 is provided with an end cap 114, which protrudes from the soil and mud. The elevation position detector 4 is fixedly installed above the end cap 114 of the movable rod 111 by a position detection mounting bracket 41. The distance sensor 43 is used to detect the distance between the end cap 114 of the movable rod 111 and the distance sensor 43. As the grouting of the bored pile is carried out, the movable rod 111 rises under the drive of the concrete floating part 112, and the distance between the end cap 114 of the movable rod 111 and the distance sensor 43 decreases.

[0060] When the distance sensor 43 detects that the distance between the end cap 114 of the movable rod 111 and the distance sensor 43 reaches the distance value corresponding to the second height value, the controller 3 controls the material cutting device 5 to reduce the discharge diameter of the discharge channel 211.

[0061] When the distance sensor 43 detects that the distance between the end cap 114 of the movable rod 111 and the distance sensor 43 reaches the distance value corresponding to the first height value, the controller 3 controls the release assembly of the hammer 22 to release the lock on the hammer 22, so that the hammer 22 contacts and cooperates with the discharge channel 211 to achieve one-time cut-off discharge.

[0062] When the distance sensor 43 detects that the distance between the end cap 114 of the movable rod 111 and the distance sensor 43 is less than the distance at the corresponding first height value, and the distance continues to decrease, the controller 3 controls the material cutting device 5 to cut off the material discharge for the second time.

[0063] In actual use, the overall density of the movable measuring component 11 is less than that of the concrete, so that the movable measuring component 11 does not sink into the concrete.

[0064] In one specific embodiment, the active measuring component 11 further includes a counterweight ring, which is detachably mounted on the concrete floating component 112. By replacing the counterweight ring with one of different masses, the overall density of the active measuring component 11 can be adjusted to adapt to soil slurry or concrete of different densities.

[0065] In one specific embodiment, the mounting height of the position detection mounting bracket 41 is adjustable.

[0066] In one specific embodiment, the position detection mounting bracket 41 is disposed on the suspension member 12, or the position detection mounting bracket 41 is directly mounted on the steel casing 13.

[0067] In one specific embodiment, the elevation position detector 4 further includes a position switch 42, which is signal-connected to the controller 3. A marking arm 115 is provided on the movable rod 111. The marking arm 115 is fixed on the movable rod 111 and floats up with the movable rod 111. When the marking arm 115 contacts and engages with the position switch 42, the corresponding elevation reaches the set first height value. The controller 3 controls the hammer release assembly 23 to release the locking of the hammer 22, release the hammer 22 and make the hammer 22 contact and engage with the discharge channel 211 to restrict the discharge.

[0068] In one specific embodiment, the elevation height of the marker arm 115 at the position of the movable rod 111 corresponds to the distance value detected by the distance sensor 43 between the end cap 114 of the movable rod 111 and the distance sensor 43, both of which correspond to the first elevation value set.

[0069] In actual use, the marker arm 115 and the position switch 42 can be used independently to measure the elevation position. The distance sensor 43 can also be used independently to measure the elevation position by detecting the distance between the end cap 114 of the movable rod 111 and the distance sensor 43. They do not affect each other. Dual use can enhance the working stability of the equipment in measuring the elevation position.

[0070] In one specific embodiment, the suspension member 12 is hung on the wall of the steel casing 13 at the borehole opening, the movable rod 111 of the movable measuring component 11 passes through the suspension member 12, and the concrete floating component 112 is suspended in the borehole. When concrete is poured into the borehole, the liquid surface of the concrete contacts the concrete floating component 112 and pushes the concrete floating component 112 to drive the movable rod 111 to move upward. The movement trajectory of the movable measuring component 11 is not constrained by the concrete pouring conduit 24.

[0071] In one specific embodiment, the suspension component 12 includes a suspension plate 121 and a connecting ring 122 disposed on the suspension plate 121. The top of the suspension plate 121 is horizontally disposed, and the movable rod 111 passes through the connecting ring 122. The end of the suspension plate 121 is provided with a suspension groove 1211, and the opening 1221 of the suspension groove 1211 is disposed downward. The connecting ring 122 is disposed at the end of the suspension plate 121, and the suspension groove 1211 is disposed at the other end of the suspension plate 121. The suspension plate 121 is made of 5mm thick Q235 steel plate. The suspension groove 1211 is an inverted U-shaped buckle, which can be directly hung on the upper edge of the steel casing 13. The top of the suspension plate 121 is provided with a horizontal reference surface, which facilitates the one-time measurement of elevation by GPS or level.

[0072] Please refer to Figure 13 and Figure 14In one specific embodiment, a U-shaped opening 1221 is provided at one end of the connecting ring 122. The movable rod 111 enters the connecting ring 122 through the opening 1221. A pin 1222 is provided at the opening 1221 of the connecting ring 122 to close the opening 1221 and prevent the movable rod 111 from accidentally falling out of the connecting ring 122 during the concrete pouring process.

[0073] In one specific embodiment, the movable rod 111 includes a first rod 1111 and a second rod 1112. The second rod is sleeved on the first rod 1111, and the first rod 1111 and the second rod 1112 are movable relative to each other. Further, the first rod 1111 is a stainless steel tube with a wall thickness of Φ14mm×0.5mm, and the second rod is a stainless steel tube with a wall thickness of Φ16mm×0.5mm. The first rod 1111 is closed at both ends and has a cavity inside. The second rod has an open end 1221 and a closed end, and has a cavity inside. The first rod 1111 can move in the second rod.

[0074] In one specific embodiment, the second rod is provided with a fixing knob 1113 for fixing the relative position of the first rod 1111 and the second rod 1112. The fixing knob 1113 is set on the rod wall of the second rod, and the fixing knob 1113 passes through the rod wall of the second rod and abuts against the first rod 1111. The relative length of the first rod 1111 and the second rod 1112 can be adjusted steplessly by fixing knob 1113, thereby adjusting the length of the entire movable rod 111. In addition, the manufacturing length of the first rod 1111 should preferably be 1m longer than the second rod, and the shortest sleeve length after stretching should be controlled to be more than 0.5m. Furthermore, the total weight of the rod body is slightly greater than the buoyancy of the same volume of soil slurry, so that it is vertically suspended in the pile hole in a static state. For example, the combination of 6m Φ14 pipe and 5m Φ16 pipe can measure the pile top depth range of 6m to 10.5m, and the combination of 4m Φ14 pipe and 3m Φ16 pipe can measure the depth range of 4m to 6.5m. The user can adjust the length of the movable rod 111 as needed.

[0075] In actual use, the concrete floating component 112 can be located 0.3m to 1m below the elevation position. The concrete floating component 112 will only come into contact with the concrete surface when the concrete liquid level rises to near the elevation position.

[0076] In one specific embodiment, the first rod 1111 is inserted into the suspension member 12. The top end of the first rod 1111 is provided with an end cap 114. The first rod 1111 is provided with a scale along its length. Furthermore, the first rod 1111 is inserted into the connecting ring 122. The size of the fixing knob 1113 is larger than the size of the connecting ring 122, thereby preventing the first rod 1111 from falling out of the connecting ring 122. The scale is set on the rod wall of the first rod 1111, and the length of the movable rod 111 can be precisely adjusted by setting the scale.

[0077] In one specific embodiment, the concrete floating component 112 includes a support plate 1121 and a floating net 1122 disposed on the lower surface of the support plate 1121. The support plate 1121 is connected to the bottom end of the second rod 1112, and a triangular brace is provided between the support plate 1121 and the second rod 1112. Furthermore, the concrete floating component 112 is located at the bottom end of the second rod 1112, and the support plate 1121 is fixedly connected to the second rod 1112. The floating net 1122 is woven from Φ1.0mm stainless steel wire into a 20mm×20mm mesh cage with an open bottom, and its shape is like an inverted cup. The side length of the support plate 1121 is 100mm, which can be applied to bored piles with a diameter of ≥600mm. When the concrete aggregate surface layer enters the floating net 1122 cage, the floating net 1122 cage is subjected to an upward supporting force and a gripping force, which drives the movable rod 111 to rise as a whole.

[0078] In one specific embodiment, the elevation detection device 1 further includes an alarm component 14, which cooperates with the position switch 42 to trigger and send a signal when the movable rod 111 floats to a predetermined height (a first height value or a second height value) with the concrete liquid surface. Furthermore, the alarm component 14 is an audible and visual alarm device that can provide audible and visual reminders to the user.

[0079] In one specific embodiment, the position switch 42 includes a stress sensor, which is electrically connected to an audible and visual alarm device. When the marker arm 115 moves upward with the first rod 1111 to the stress sensor, the marker arm 115 presses against the stress sensor, and the stress sensor transmits a signal to the audible and visual alarm device, thereby causing the audible and visual alarm device to sound an alarm.

[0080] In one specific embodiment, the marking arm 115 is movably mounted on the first rod 1111 via an adjustment knob 116. The position of the marking arm 115 on the first rod 1111 can be adjusted by adjusting the knob 116, and the position of the marking arm 115 can be precisely adjusted according to the scale set on the first rod 1111, thereby achieving the adjustment of the predetermined alarm height.

[0081] In another specific embodiment, a distance sensor 43 can be used to monitor whether the elevation has reached the set first height value and the second height value, respectively. In this case, the position switch 42 and the marker arm 115 may not be required.

[0082] In actual use, the smaller the distance detected by the distance sensor 43, the larger the elevation value (height of the bored pile).

[0083] Please refer to Figure 15 In conjunction with references Figure 1This application also provides a method for grouting bored piles, using the aforementioned grouting equipment. The grouting equipment includes an elevation detection device 1, a material feeding device 2, a material cutting device 5, and a controller 3. The elevation detection device 1 includes an elevation measuring element and an elevation position detector 4 connected to the elevation measuring element. The elevation position detector 4 is signal-connected to the controller 3. The elevation measuring element is used to sink into the soil slurry in the borehole. As the concrete is poured, the surface of the concrete contacts the elevation measuring element and pushes it upwards. The elevation measuring device is able to mark the elevation position. The feeding device 2 includes a hopper 21, a hammer 22 and a hammer release assembly 23 connected to the hammer 22. The hammer release assembly 23 is connected to the controller 3 by signal control. The lower end of the hopper 21 has a discharge channel 211 that communicates with the inside of the hopper 21. The discharge channel 211 is connected to a guide tube 24. The hammer 22 contacts and cooperates with the side of the discharge channel 211 away from the guide tube 24 to restrict the discharge of material from the discharge channel 211. The cutting device 5 is connected to the controller 3 by signal control and is set on the discharge channel 211. The above-mentioned infusion method includes the following steps: Please refer to step S100. Figure 1 During the initial pouring stage, the control hammer release component 23 locks the hammer 22, preventing the hammer 22 from contacting the discharge channel 211. The material cutting device 5 does not reduce the discharge diameter of the discharge channel 211. The material falls to the bottom of the borehole through the discharge channel 211 and the guide tube 24. During the pouring process, the elevation position detector 4 detects the elevation position in real time and transmits the detection signal to the controller 3 and judges it with the reference value. The reference value of the controller 3 includes the first height value and the second height value. The first height value is greater than the second height value. Please refer to step S200. Figure 5 The controller 3 continues to receive and judge the detection signal. When the controller 3 judges that the elevation has reached the set second height value according to the detection signal, the controller 3 controls the cutting device 5 to operate to reduce the discharge diameter of the discharge channel 211, thereby slowing down the discharge speed of the material. For step S300, please refer to... Figure 7 The controller 3 continues to receive and judge the detection signal. When the controller 3 judges that the elevation has reached the set first height value according to the detection signal, the controller 3 controls the hammer release component 23 to release the lock on the hammer 22, so that the hammer 22 contacts and cooperates with the discharge channel 211 to restrict the discharge.

[0084] This method sets two levels of height control nodes (first height value and second height value) during the pouring process. When the pouring surface reaches the second height value first, the controller 3 drives the material cutting device 5 to reduce the diameter of the discharge channel 211, thereby reducing the material flow rate and allowing time for complete closure. When the pouring surface continues to rise to the first height value, the controller 3 then drives the material hammer release component 23 to release the lock, allowing the material hammer 22 to contact and cooperate with the discharge channel 211 to achieve complete closure. This two-stage control method, which first throttles and then cuts off, can extend the operating window from detecting the elevation to completely stopping the discharge, avoiding the control lag or excessive impact caused by single-stage rapid closure, making the discharge termination process more stable and controllable, further improving the elevation control accuracy, and reducing over-pouring.

[0085] Please refer to Figure 11 In one embodiment, when the controller 3 controls the release assembly of the hammer 22 to release the lock on the hammer 22, so that the hammer 22 contacts and engages with the discharge channel 211 to restrict the discharge, the elevation position detector 4 continues to detect the distance between the movable rod 111 and the distance sensor 43, and transmits the detected distance signal to the controller 3. When the distance between the movable rod 111 and the distance sensor 43 detected by the elevation position detector 4 is less than the distance when the corresponding first height value is less than the distance, and the distance continues to decrease, it indicates that relying solely on the material hammer 22 to close the discharge channel 211 has failed to completely stop the material from being discharged. The controller 3 controls the material cutting device 5 to cut off the discharge of the discharge channel 211 for the second time, forming a double closure guarantee.

[0086] In practice, since the material is concrete, when the hammer 22 contacts the discharge channel 211 for sealing and discharge cutoff, aggregate may remain between the hammer 22 and the discharge channel 211, creating a gap. Material may leak through this gap, causing over-filling and exceeding standards in the bored pile. Therefore, a material-cutting device 5 is added as a secondary cutoff for discharge. When the hammer 22 and the discharge channel 211 are completely sealed, the material-cutting device 5 does not need to perform the secondary cutoff discharge action.

[0087] In one specific embodiment, a Φ800mm bored pile is selected, with a drilling depth of 35m. The designed pile top elevation is -4.500m (second height value), and the over-poured pile top is -4.000m (first height value). Using the Yellow Sea datum as the reference, the use of the grouting equipment includes the following steps: Step 1: Secure the suspension component 12 to the upper edge of the steel casing 5. Use GPS to measure the top elevation of the suspension component 12 as +2.600m and the elevation of the soil slurry surface as +3.100m. That is, the distance from the top of the suspension component 12 to the soil slurry surface is 0.5m. Step 2, adjust the length L of the movable rod 111 to 2.6 – (–4.500) + 0.5 = 7.600m, lock the fixing knob 1113, and adjust the overall density of the movable measuring component 11 so that the end cap 114 of the movable rod 111 floats out just above the surface of the mud slurry. Step 3: The hopper 21 is connected to the guide pipe 24 and positioned (after cleaning). The hammer is lowered to seal the outlet of the discharge channel 211. After the hopper is filled with concrete, the hammer is pulled out instantly and locked in place. The first batch of concrete is poured into the borehole of the cast-in-place pile (the start of the pouring). The concrete truck feeds the hopper, and the underwater concrete surface slowly rises. While rising, the pipe section of the guide pipe 24 is removed. When the concrete surface rises to -4.500m, the aggregate in the concrete surface layer enters the floating net 1122 at the bottom of the rising rod. The concrete surface pushes the support plate to move up, causing the movable rod 111 to start rising. The concrete surface reaches the designed pile top elevation (second height value). The distance sensor detects that the top end cap of the movable rod 111 begins to move up relative to the soil slurry surface. The controller controls the material cutting device 5 to reduce the discharge diameter to reduce the discharge amount per unit time of the discharge channel. Step 4: When the distance sensor detects that the top end cap of the movable rod 111 has moved 0.5m relative to the surface of the soil slurry, the marker arm 115 triggers the positioning switch 42, the audible and visual alarm device sounds an alarm, the controller controls the release of the material hammer 22, and the pouring stops. The final pile top elevation is -4.000m.

[0088] Step 5: If the distance sensor detects that the top of the movable rod 111 continues to move upward, it indicates that there is material leakage when the hammer 22 cuts the material, and the controller controls the cutting device 5 to cut the material a second time.

[0089] Step 6: Remove the guide pipe to complete the grouting of one bored pile and control the concrete elevation. Transfer the grouting equipment to another pile location and repeat the operation.

[0090] The above description is merely a preferred embodiment of the present invention and does not limit the scope of patent protection of the present invention. Any equivalent structural transformations made based on the description and drawings of the present invention, whether directly or indirectly applied to other related technical fields, are similarly included within the scope of protection of the present invention.

Claims

1. A grouting device for cast-in-place bored piles, characterized in that, Includes an elevation detection device, a material feeding device, and a controller; The elevation detection device includes an elevation measuring element and an elevation position detector connected to the elevation measuring element. The elevation position detector is signal-connected to the controller. The elevation measuring element is used to sink into the soil slurry in the borehole. As concrete is poured, the surface of the concrete will contact the elevation measuring element and push the elevation measuring element upward so that the elevation measuring element can mark the elevation position. The elevation position detector is used to detect whether the elevation has reached the set height. The feeding device includes a hopper, a hammer, and a hammer release assembly connected to the hammer. The hammer release assembly is connected to the controller via signal control. The lower end of the hopper has a discharge channel communicating with the inside of the hopper. The hammer is used to contact and cooperate with the discharge channel to restrict the discharge of material. The discharge channel is connected to a guide tube, which is used to transfer the material in the hopper to the bottom of the borehole. When the elevation position detector detects that the elevation has not reached the set first height value, the hammer release component locks the hammer, preventing the hammer from contacting and engaging with the discharge channel; When the elevation position detector detects that the elevation has reached the set first height value, the elevation position detector transmits the arrival signal to the controller. The controller controls the hammer release assembly to release the hammer, so that the hammer contacts and engages with the discharge channel to restrict the discharge of material from the discharge channel. The hammer is used to contact and engage with the side of the discharge channel away from the guide tube; It also includes a material cutting device, which is connected to the controller via signal control. The material cutting device is disposed on the discharge channel and located on the side of the discharge channel close to the guide tube. The material cutting device is used to reduce the discharge diameter of the discharge channel and to stop the discharge of the discharge channel. When the elevation position detector detects that the elevation has not reached the set second height value, and the second height value is less than the first height value, the material cutting device does not reduce the discharge diameter of the discharge channel; When the elevation position detector detects that the elevation has reached the set second height value, the controller controls the material cutting device to reduce the diameter of the discharge channel to slow down the material discharge speed; The material cutting device includes a material insertion plate and an insertion plate pushing assembly connected to the material insertion plate; The discharge channel has a movable channel for inserting plates on its body wall. The inserting plates are inserted into the movable channel and can move along the movable channel toward or away from the central axis of the discharge channel. The insert plate pushing assembly is connected to the controller via signal control, and the insert plate pushing assembly is used to drive the material insert plate to move towards or away from the central axis of the discharge channel.

2. The grouting equipment for cast-in-place bored piles as described in claim 1, characterized in that, The elevation measuring component includes a suspension component and a movable measuring assembly. The suspension component is used to be fixedly installed on the steel casing inside the borehole and is located at the borehole opening. The movable measuring component includes a vertically arranged movable rod and a concrete floating component fixedly connected to the bottom of the movable rod. The movable rod includes a length-adjustable structure. The upper part of the movable rod passes through the suspension component. The concrete floating component is used to sink into the soil slurry and contact the liquid surface of the concrete, and under the pushing action of the liquid surface of the concrete, it drives the movable rod to move vertically upward. The elevation position detector is used to detect the horizontal position height of the movable rod. When the horizontal position height of the movable rod reaches the set value, the elevation reaches the set height.

3. The grouting equipment for cast-in-place bored piles as described in claim 2, characterized in that, The elevation position detector includes a distance sensor and a position detection mounting frame. The position detection mounting frame is fixedly installed on the steel casing inside the borehole. The movable rod has an end that protrudes from the soil and mud. The elevation position detector is installed on the position detection mounting frame and is located directly above the movable rod. The distance sensor is connected to the controller via a signal. The distance sensor is used to detect the distance between the movable rod and the distance sensor, and transmits the detected distance signal to the controller.

4. The grouting equipment for cast-in-place bored piles as described in claim 1, characterized in that, The cross-section of the discharge channel is rectangular; The material insert plate is inserted at an angle into the movable channel of the insert plate; The material insert plate includes at least two, which are arranged opposite each other and in a "V" shape or funnel shape.

5. The grouting equipment for cast-in-place bored piles as described in claim 1, characterized in that, The outer wall of the hammer that contacts and engages with the discharge channel is provided with a soft rubber buffer ring.

6. The grouting equipment for cast-in-place bored piles as described in claim 1, characterized in that, The hammer includes a hammer rod and a hammer body connected together. The hammer body is located directly above the discharge channel. The hammer body is used to contact and cooperate with the discharge channel to restrict the discharge of material. A pin groove is provided on the side wall of the hammer rod. The hammer release assembly includes a release frame and an electromagnetic locking pin mounted on the release frame. The electromagnetic locking pin is connected to the controller via signal control. The release frame is provided with a release channel. The hammer rod is movably disposed in the release channel. The pin of the electromagnetic locking pin extends into the release channel and engages with the pin groove on the side wall of the hammer rod to lift the hammer and prevent the hammer from contacting the discharge channel. When the elevation position detector detects that the elevation has reached the set first height value, the controller controls the pin of the electromagnetic locking pin to retract from the pin mating groove to release the material hammer. The material hammer falls under the action of gravity and contacts the discharge channel to restrict the discharge.

7. A method for grouting bored piles, characterized in that, The grouting is carried out using a grouting device for bored piles, the grouting device including any one of claims 1 to 6; The infusion method includes the following steps: During the initial pouring stage, the material hammer release assembly is controlled to lock the material hammer, preventing it from contacting the discharge channel. The material cutting device does not reduce the discharge diameter of the discharge channel. The material falls to the bottom of the borehole through the discharge channel and the guide tube. During the pouring process, the elevation position detector detects the elevation position in real time and transmits the detection signal to the controller and compares it with the reference value. The reference value of the controller includes a first height value and a second height value, where the first height value is greater than the second height value. The controller continues to receive the detection signal and make a judgment. When the controller determines that the elevation has reached the set second height value based on the detection signal, the controller controls the material cutting device to operate to reduce the diameter of the material discharge channel, thereby slowing down the material discharge speed. The controller continues to receive the detection signal and make a judgment. When the controller determines that the elevation has reached the set first height value based on the detection signal, the controller controls the hammer release assembly to release the hammer, so that the hammer contacts and engages with the discharge channel to restrict the discharge.

8. The grouting method for a bored pile as described in claim 7, characterized in that, The elevation measuring component includes a suspension member and a movable measuring assembly. The suspension member is used to be fixedly installed on the steel casing inside the borehole. The movable measuring assembly includes a vertically arranged movable rod and a concrete floating component fixedly connected to the bottom of the movable rod. The upper part of the movable rod passes through the suspension member. The concrete floating component is used to sink into the mud slurry and contact the liquid surface of the concrete, and under the pushing action of the liquid surface of the concrete, it drives the movable rod to move vertically upward. The elevation position detector is used to detect the horizontal position height of the movable rod. When the controller controls the hammer release assembly to release the hammer, allowing the hammer to contact and engage with the discharge channel to restrict discharge, the elevation position detector continues to detect the distance between the movable rod and the distance sensor, and transmits the detected distance signal to the controller. When the elevation position detector detects that the distance between the movable rod and the distance sensor is less than the distance at the corresponding first height value, and the distance continues to decrease, the controller controls the material cutting device to stop the material from being discharged from the discharge channel.

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