A precise control device for the top of a deep-buried caisson cast-in-place pile

Abstract

The utility model discloses a kind of precise control device of caisson deep-buried cast-in-place pile pile top, including pre-buried steel sleeve and pile head cleaning system;Pre-buried steel sleeve is set on reinforcement cage and its top side reserved longitudinal muscle, and can change customization to meet the construction demand of different pile diameter, different height concrete buried depth, ensure that pile top is not reaming and auxiliary pile top chiseling work;Pile top cleaning system is realized by rotating rod and spiral tool bit to lower limit cage, both by with pre-buried steel sleeve interwork, realize accurate and ensure the diameter and top elevation of the purpose of deep-buried cast-in-place pile pile top;Using the device to carry out caisson deep-buried cast-in-place pile construction can realize caisson deep-buried cast-in-place pile pile top precise control, and it is easy to operate, low in cost, high in operation precision, effectively guarantee subsequent caisson sinking process to be successfully completed.

Description

Technical Field

[0001] This utility model relates to the field of caisson foundation cast-in-place pile construction technology, and in particular to a precise control device for the top of a deep-buried cast-in-place pile. Background Technology

[0002] The caisson combined with the bottom cast-in-place pile foundation is a composite deep foundation structure, and its technological development stems from the collaborative innovation of traditional caisson and bored cast-in-place pile technologies. As caissons become increasingly larger and the number of bottom piles increases, the collaborative working mechanism between the caisson and the pile foundation remains unclear.

[0003] In normal cast-in-place pile construction, to ensure the quality of the pile top concrete and that the pile top elevation matches the construction design, over-pouring is generally used. The over-pouring portion is then removed through subsequent excavation. However, this method is prone to issues such as excessive pile height or enlarged pile tops, which can lead to problems like the pile foundation being bumped during the excavation of the caisson by the grab bucket, obstruction during the sinking of the caisson's cutting edge or bottom beam, and even caisson tilting. Furthermore, excessively high piles require underwater excavation by divers during sinking, delaying the construction period and posing significant safety risks. Therefore, it is necessary to design a precise control device for the pile top of deeply buried cast-in-place piles in caissons, addressing the problems existing in current technology. Utility Model Content

[0004] The purpose of this invention is to provide a device for precise control of the top of deeply buried cast-in-place piles in caissons, which solves the aforementioned problems in the prior art.

[0005] Therefore, the technical solution of this utility model is as follows:

[0006] A precise control device for the top of a deep-buried cast-in-place pile in a caisson comprises a pre-embedded steel sleeve and a pile head cleaning system. The pre-embedded steel sleeve includes an upper sleeve and a lower sleeve, which are two circular annular cylinders arranged vertically. Multiple U-shaped buckles are evenly distributed circumferentially at the center of the inner wall of the upper and lower sleeves, allowing the top sides of the reinforcing cage and its reserved longitudinal reinforcement bars to be centrally fixed within the lower and upper sleeves respectively via these U-shaped buckles. A circular ring plate is fixed to the top surface of the upper sleeve. The pile head cleaning system includes a rotating rod, which is a vertically arranged long rod with an axial through hole in the center. Lower and upper limiters are spaced apart on the lower side of the rotating rod. A spiral cutter head, consisting of multiple... The fan-shaped blades are fixed to the outer wall of the rotating rod at equal intervals from bottom to top through small-sized arc-shaped ends, and are arranged in a horizontal manner in a spiral pattern along the circumference of the rotating rod. Each fan-shaped blade has a cavity, and water outlet holes connected to the cavity are spaced apart on its two side walls and the arc surface of the large-sized arc-shaped end. The cavity of the fan-shaped blade is also connected to the axial through hole of the rotating rod through the holes opened along its small-sized arc-shaped end and the side wall of the rotating rod. A limiting cage is fitted on the outside of the spiral cutter head, which is a cylindrical cage that tapers inward at the top. A sleeve is connected to the opening at the top of the limiting cage, which is fitted on the outside of the rotating rod and located above the lower limiter. A pressure sensor is installed on the inner wall of the bottom side of the limiting cage.

[0007] Furthermore, the axial length of the upper sleeve is adapted to the length of the anchoring reinforcement of the cast-in-place pile, so that the bottom end face of the upper sleeve is located at the design elevation of the pile top; the spacing between the upper limit device and the lower limit device is set to be the same as the axial length of the upper sleeve.

[0008] Furthermore, multiple ring-shaped reinforcing bars are installed and welded onto the outer wall of the lower sleeve from bottom to top at intervals.

[0009] Furthermore, the rotating rod is composed of multiple hollow rods with axial through holes in the center, which are connected by threads in sequence; the length of each hollow rod is 2m to 3m, and the diameter of its axial through hole is 8cm to 12cm.

[0010] Furthermore, a scale is marked on the side wall of the rotating rod, and the zero mark of the scale is flush with the bottom end face of the rotating rod to accurately position the upper and lower limit devices on the rotating rod; the measurement accuracy of the scale is 1cm.

[0011] Furthermore, the lower limiter is a circular limit ring, which is sleeved and fixed on the outer wall of the rotating rod; the upper limiter includes a limit sleeve sleeved on the outside of the rotating rod, on which a limit screw is threaded and threaded along the radial direction.

[0012] Furthermore, a high-pressure nozzle is installed at the water outlet of each fan-shaped blade, and the high-pressure nozzle is set with its jet angle at an upward angle of 10°±2°.

[0013] Furthermore, the limiting cage is composed of multiple horizontally spaced second annular ribs arranged from bottom to top, and longitudinal ribs that are equally spaced along the circumference of the multiple second annular ribs and fixed to the outer wall of each second annular rib.

[0014] Furthermore, the pile head cleaning system also includes a trolley and an adjustable high-pressure pump system; the trolley has a freely movable power system, which is equipped with a motor that can be connected to the top of the rotating rod and drive the rotating rod to rotate at high speed and move up and down; the adjustable high-pressure pump system is set on the trolley, and its water outlet is connected to the top of the rotating rod to pump high-pressure water into the central through hole of the rotating rod.

[0015] Compared with existing technologies, this precise control device for the top of deeply buried cast-in-place piles solves the problem of difficult control of the top of deeply buried cast-in-place piles in existing technologies, as described above. Specifically, by setting up pre-embedded steel sleeves, the device can meet the construction needs of cast-in-place piles with different diameters and concrete embedment depths by changing the diameter and height, ensuring that the pile top does not enlarge. Moreover, the pre-embedded steel sleeves can be used to complete the pile top chiseling work that is still required in traditional operations during construction. The pile top cleaning system of this device can meet the needs of cleaning the top of piles with different embedment depths and diameters by adjusting the length of the rotating rod and the water pressure of the high-pressure pump. By utilizing the cooperation between the limiting cage, the spiral cutter head, and the pre-embedded steel sleeves, the goal of efficiently and accurately completing the cast-in-place pile construction operation is achieved. Furthermore, the device and its supporting construction methods are simple to operate, low in cost, and have the advantages of accurately ensuring the diameter and top elevation of the deeply buried cast-in-place pile top, ensuring the smooth completion of the subsequent caisson sinking process. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the precise control device for the top of the deep-buried cast-in-place pile in an embodiment of this utility model;

[0017] Figure 2 This is a schematic diagram of the pre-embedded steel sleeve of the precise control device for the top of the deep-buried cast-in-place pile in an embodiment of this utility model;

[0018] Figure 3 This is a schematic diagram of the spiral cutter head, limiting cage, and rotating rod of the precise control device for the top of the deep-buried cast-in-place pile in an embodiment of this utility model.

[0019] Figure 4 This is a schematic diagram of the spiral cutter head of the precision control device for the top of the deep-buried cast-in-place pile in an embodiment of this utility model;

[0020] Figure 5 This is a schematic diagram of the structure of the precise control device for the top of the deep-buried cast-in-place pile in an embodiment of this utility model. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but the following embodiments are by no means intended to limit the present invention.

[0022] See Figure 1 The precision control device for the top of the deep-buried cast-in-place pile includes a pre-embedded steel sleeve 1 and a pile top cleaning system. The pre-embedded steel sleeve 1 is pre-set on the top side of the reinforcing cage 7 of the cast-in-place pile to assist in positioning the pile top cleaning system. The pile top cleaning system works in conjunction with the pre-embedded steel sleeve 1 to break up and remove the over-filled portion of the cast-in-place pile, ensuring that the top of the cast-in-place pile is consistent with the construction design elevation and without causing damage to the pile top.

[0023] See Figure 2 The pre-embedded steel sleeve 1 includes an upper sleeve 101 and a lower sleeve 102, which are two cylindrical bodies arranged one above the other. The outer diameter of the two sleeves is the same as the design pile diameter of the cast-in-place pile, and the inner diameter of the two sleeves is larger than the outer diameter of the reinforcing cage 7. Multiple U-shaped buckles 103 are evenly distributed circumferentially at the center of the inner wall of the upper sleeve 101 and the lower sleeve 102. Each U-shaped buckle 103 is welded and fixed on one side to the inner wall of the upper sleeve 101 or the lower sleeve 102, and on the other side is used to weld and fix to the longitudinal reinforcement of the reinforcing cage 7 built into the pre-embedded steel sleeve 1, so that the pre-embedded steel sleeve 1 and the reinforcing cage 7 are fixedly connected as a whole, so that in the actual operation, the pre-embedded steel sleeve 1 and the reinforcing cage 7 are simultaneously lowered into the pile hole of the cast-in-place pile.

[0024] In practical applications, in order to ensure the quality of the top pouring of the cast-in-place pile, the cast-in-place pile is poured using an over-pouring method. Accordingly, a ring of longitudinal bars is reserved on the top side of the reinforcing cage 7. Based on this, the axial length of the upper sleeve 101 is set to be compatible with the length of the reserved longitudinal bar on the top side of the reinforcing cage 7, and it is fixed to the top side of the reserved longitudinal bar with its top flush with the top of the reserved longitudinal bar on the top side of the reinforcing cage 7, so that the bottom end face of the upper sleeve 101 is flush with the top elevation of the cast-in-place pile. The lower sleeve 102 is fitted and fixed on the top outer wall of the reinforcing cage 7.

[0025] A circular ring plate 105 is welded and fixed on the top surface of the upper sleeve 101. Its outer diameter is the same as that of the upper sleeve 101, and its inner diameter is slightly smaller than that of the upper sleeve 101, so as to serve as a lowering limit plate for the pile top cleaning system.

[0026] As a preferred technical solution in this embodiment, multiple ring-shaped reinforcing bars 104 are installed and welded on the outer wall of the lower sleeve 102 from bottom to top at intervals. This is to increase the friction between the sleeve 102 and the sealing concrete during the later construction of the caisson bottom sealing concrete, and to prevent the outer wall of the sleeve from becoming too smooth, thus reducing the original anchoring force between the cast-in-place pile and the caisson.

[0027] In this embodiment, both the upper sleeve 101 and the lower sleeve 102 are made of steel plates with a thickness of 6mm. The axial height of the upper sleeve 101 is consistent with the length of the longitudinal reinforcement reserved on the top side of the cast-in-place pile reinforcement cage 7, and it can be cut and reused as needed after excavation. The axial length of the lower sleeve 102 is set to 3~4m, and the first annular reinforcement 104 on its outer wall is made of 8mm threaded steel. Multiple first annular reinforcements 104 are evenly arranged at a spacing of 100mm. The circular ring plate 105 is made of annular steel plate with a thickness of 6mm and a radial width of 50mm.

[0028] See Figure 3 and Figure 4 The pile top cleaning system includes a rotating rod 4, with a spiral cutter head 2 installed at the bottom of the rotating rod 4, and a limiting cage 3 sleeved on the outside of the spiral cutter head 2.

[0029] See Figure 3 The rotating rod 4 includes a vertically arranged long rod, which is specifically composed of multiple hollow rod sections with axial through holes in their centers, connected sequentially by threads. In this embodiment, the length of each hollow rod is 3m, and the diameter of its axial through hole is 10cm.

[0030] A lower limiter 401 and an upper limiter 402 are provided at intervals from bottom to top on the lower side of the rotating rod 4. The lower limiter 401 is a circular limiting ring, which is sleeved and fixed on the outer wall of the rotating rod 4 to limit the limiting cage 3 from naturally sliding down to a designated position near the bottom of the rotating rod 4 under the action of gravity. The upper limiter 402 includes a limiting sleeve sleeved on the outside of the rotating rod 4. A limiting screw hole is opened radially on the side wall of the limiting sleeve, and a limiting screw is inserted in the screw hole, so that the limiting sleeve can move up and down relative to the rotating rod 4. By rotating the limiting screw until its end is tightly against the outer wall of the rotating rod 4, the limiting sleeve is fixed on the rotating rod 4, that is, the position of the upper limiter 402 on the rotating rod 4 is fixed.

[0031] In practical applications, the distance between the upper limit switch 402 and the lower limit switch 401 is controlled, that is, when the position of the limit cage 3 is fixed, the distance of the rotating rod 4 continuing to descend relative to the limit cage 3 is controlled.

[0032] As a preferred technical solution of this embodiment, a scale is marked on the side wall of the rotating rod 4, and the zero mark of the scale is flush with the bottom end face of the rotating rod 4, so as to accurately position the upper limit device 402 and the lower limit device 401 on the rotating rod 4; wherein, the measurement accuracy of the scale line is 1cm, so as to ensure that the accuracy error is ≤±1cm.

[0033] See Figure 5The spiral cutter head 2 consists of three fan-shaped blades 201, which are fixed at equal intervals from bottom to top on the outer wall of the bottom of the rotating rod 4 through small arc-shaped ends, and are arranged in a horizontal manner in a spiral pattern along the circumference of the rotating rod 4. Each fan-shaped blade 201 has a cavity 202, and water outlet holes connected to the cavity 202 are provided at intervals on its two side walls and the arc surface of the large arc-shaped end. Each water outlet hole is provided with a high-pressure nozzle 203, and the high-pressure nozzle 203 is set with its jet angle at an upward angle of 10°±2°. The cavity 202 of each fan-shaped blade 201 is also connected to the axial through hole of the rotating rod 4 through the hole opened along its small arc-shaped end and the side wall of the rotating rod 4, so that the rotating rod 4 can also be used as a water supply pipeline to supply water to the inner cavity of the three fan-shaped blades 201 through its axial through hole. In the spiral cutter head 2, the jet angle of each high-pressure nozzle 203 is set at an angle upward to avoid damaging the concrete below the elevation.

[0034] The limiting cage 3 is a cylindrical cage with its top end tapering inwards into a cone shape. In this embodiment, the cage is composed of multiple horizontally spaced second annular ribs 301 arranged from bottom to top, and longitudinal ribs 304 equally spaced along the circumference of the multiple second annular ribs 301 and fixed to the outer wall of each second annular rib 301. The outer diameter of the cylindrical part of the cage is the same as the designed pile diameter, and the inner diameter is larger than the outer diameter of the spiral cutter head 2, so that it is fitted onto the outside of the spiral cutter head 2 with a gap. A sleeve 302 is vertically fixed at the top opening of the limiting cage 3. It is fitted onto the outside of the rotating rod 4 and located above the lower limiter 401, so that the lower limiter 401 and the sleeve 302 abut against each other to restrict the limiting cage 3 to the upper and lower limiting positions of the rotating rod 4, so that the limiting cage 3 can only move up and down between the lower limiter 401 and the upper limiter 402 of the rotating rod 4.

[0035] A pressure sensor 303 is installed on the inner wall of the bottom side of the limiting cage 3 (specifically, on the inner wall of the second annular rib 301 on the bottom side of the limiting cage 3). The position of the pressure sensor 303 corresponds to any one of the high-pressure nozzles 203 on the bottom side of the spiral cutter head 2, so as to monitor the pressure value of the high-pressure water sprayed from the spiral cutter head 2 in real time. Then, according to the actual construction state of the cast-in-place pile, the jet pressure of the high-pressure nozzle 203 is dynamically adjusted to prevent the high-pressure water from failing to disperse the concrete or from collapsing the hole due to the high-pressure water hitting the hole wall.

[0036] See Figure 1 The pile top cleaning system also includes a trolley 5 and an adjustable pressure high-pressure pump system 6, both of which are existing equipment. The trolley 5 has its own power system and can move freely. It is equipped with a motor that can be connected to the top of the rotating rod 4 and drive the rotating rod 4 to rotate at high speed and move up and down. The adjustable pressure high-pressure pump system 6 is set on the trolley 5, and its water outlet is connected to the axial through hole of the rotating rod 4 to provide a water pressure of no more than 40 MPa.

[0037] See Figures 1-5 The specific implementation steps of the operation method using the aforementioned precise control device for the top of the deeply buried cast-in-place pile are as follows:

[0038] S1. Clearing the surface and marking the pile positions; Specifically, before construction, the surface debris such as weeds, garbage and boulders in the pile driving area is cleared, and then the pile driving positions and dimensions are accurately marked on the ground according to the design drawings.

[0039] S2. Lower the casing and use appropriate pile construction equipment with mud circulation for wall protection. After the pile is drilled to the design elevation, stop drilling. After drilling is completed, check the mud quality, drilling depth, and sediment condition, and clean the hole.

[0040] S3. Based on the dimensions of the pile hole, fabricate a steel cage 7 that matches the dimensions of the pile hole, and reserve a ring of longitudinal bars on the top side of the steel cage 7; weld and fix the upper sleeve 101 of the pre-embedded steel sleeve 1 to the top side of the reserved ring of longitudinal bars, and weld and fix the lower sleeve 102 to the top side of the steel cage 7. No welding is required between the upper sleeve 101 and the lower sleeve 102.

[0041] S4. Using lifting equipment, lift the entire structure formed by the steel cage 7 and the pre-embedded steel sleeve 1; wherein, the number of lifting points for lifting the steel cage 7 can be set according to the designed pile length, and after being lifted, turned over and erected, it is lowered to the bottom of the pile;

[0042] S5. Lower the concrete pouring guide pipe until the pipe opening is 30cm~50cm from the bottom of the pile hole, and pour concrete underwater to the over-poured portion specified in the standard; when pouring concrete, pay attention to the depth of the guide pipe embedded in the concrete, which should be 2m~6m.

[0043] S6. Pull out the concrete pouring guide pipe and immediately move the trolley 5 to the pile position. The trolley 5 lowers the spiral cutter head 2 and the limiting cage 3 through the rotating rod 4 until the bottom of the two contacts the concrete surface. At this time, since the concrete has not yet reached the final setting state, the spiral cutter head 2 and the limiting cage 3 can continue to go down through the rotating rod 4.

[0044] The trolley 5 motor and high-pressure pump system 6 are turned on. As the spiral cutter head 2 continues to descend with the rotating rod 4, it rotates while spraying high-pressure water, causing the over-filled concrete to be dispersed by the spiral cutter head 2. During this process, the limiting cage 3 also slowly descends until it abuts against the circular ring plate 105 at the top of the upper sleeve 101. At this time, only the rotating rod 4 can continue to descend and continue to disperse the concrete inside the upper sleeve 101 until the top sleeve 302 of the limiting cage 3 moves upward relative to the upper limit device 402. The distance between the upper limit device 402 and the lower limit device 401 is set to be the same as the axial length of the upper sleeve 101. At the same time, the bottom fan-shaped blade 201 of the spiral cutter head 2 is close to the bottom of the limiting cage 3 in the initial descending state. Therefore, when the rotating rod 4 can no longer descend, the spiral cutter head 2 also descends to above the pile top elevation. The pile top cleaning system completes the dispersal and cleaning of the over-filled part above the pile top without causing damage to the pile top.

[0045] During the process of the spiral cutter head 2 dispersing and washing the concrete, the output pressure of the high-pressure pump can be adjusted at any time according to the data reflected by the pressure sensor 303 on the limit cage 3 to prevent the high-pressure water from failing to disperse the concrete or from rushing to the hole wall and causing the hole to collapse. At the same time, the nozzle is set to be horizontally upward 10° to avoid damaging the concrete below the elevation.

[0046] S7. Turn off the high-pressure pump system 6, and control the control vehicle 5 to gradually reduce the rotation speed of the rotating rod 4 to a stop, and then slowly lift out the pile top cleaning system;

[0047] S8. Fill the empty pile portion at the top of the cast-in-place pile with sand by means of duct filling, and the operation is completed.

Claims

1. A device for precise control of the top of a deep-buried cast-in-place pile in a caisson, characterized in that, It consists of a pre-embedded steel sleeve (1) and a pile head cleaning system; among which, The pre-embedded steel sleeve (1) includes an upper sleeve (101) and a lower sleeve (102), which are two circular annular cylinders arranged one above the other. Multiple U-shaped buckles (103) are evenly distributed circumferentially at the center of the inner wall of the upper sleeve (101) and the lower sleeve (102), so that the top side of the steel cage (7) and the reserved longitudinal reinforcement above it are respectively fixed in the lower sleeve (102) and the upper sleeve (101) through each U-shaped buckle (103). A circular ring plate (105) is fixed on the top surface of the upper sleeve (101). The pile head cleaning system includes a rotating rod (4), which is a long rod with a vertical setting and an axial through hole in the center. A lower limiter (401) and an upper limiter (402) are set at intervals on the lower side of the rotating rod (4). A spiral cutter head (2) is set at the bottom end of the rotating rod (4). It consists of multiple fan-shaped blades (201) that are fixed at equal intervals from bottom to top on the outer wall of the rotating rod (4) through small arc-shaped ends. They are arranged in a horizontal manner and spirally distributed along the circumference of the rotating rod (4). Each fan-shaped blade (201) has a cavity. Water outlet holes connected to the cavity are set at intervals on its two side walls and the arc surface of the large arc-shaped end. The cavity of the fan-shaped blade (201) is also connected to the axial through hole of the rotating rod (4) through the channel opened along its small arc-shaped end and the side wall of the rotating rod. A limiting cage (3) is fitted on the outside of the spiral cutter head (2), which is a cylindrical cage with the top end tapering inward into a cone shape; a sleeve (302) is connected to the top opening of the limiting cage (3), which is fitted on the outside of the rotating rod (4) and located above the lower limiter (401); a pressure sensor (303) is provided on the bottom inner wall of the limiting cage (3).

2. The precise control device for the top of the deep-buried cast-in-place pile according to claim 1, characterized in that, The axial length of the upper sleeve (101) is adapted to the length of the anchor reinforcement of the cast-in-place pile, so that the bottom end face of the upper sleeve (101) is located at the design elevation of the pile top; the spacing between the upper limit device (402) and the lower limit device (401) is set to be the same as the axial length of the upper sleeve (101).

3. The precise control device for the top of the deep-buried cast-in-place pile according to claim 1, characterized in that, Multiple ring-shaped reinforcing bars (104) are installed and welded on the outer wall of the lower sleeve (102) from bottom to top at intervals.

4. The precise control device for the top of the deep-buried cast-in-place pile according to claim 1, characterized in that, The rotating rod (4) is composed of multiple hollow rods with axial through holes in the center, which are connected by threads in sequence; the length of each hollow rod is 2m~3m, and the diameter of its axial through hole is 8cm~12cm.

5. The precise control device for the top of the deep-buried cast-in-place pile according to claim 1, characterized in that, The side wall of the rotating rod (4) is marked with a scale, and the zero mark of the scale is flush with the bottom end face of the rotating rod (4) to accurately position the upper limit device (402) and the lower limit device (401) on the rotating rod (4); the measurement accuracy of the scale line is 1cm.

6. The precise control device for the top of the deep-buried cast-in-place pile according to claim 1, characterized in that, The lower limit device (401) is a circular limit ring, which is sleeved and fixed on the outer wall of the rotating rod (4); the upper limit device (402) includes a limit sleeve sleeved on the outside of the rotating rod (4), on which a limit screw is threaded and threaded along the radial direction.

7. The precise control device for the top of the deep-buried cast-in-place pile according to claim 1, characterized in that, High-pressure nozzles (203) are provided at the water outlet of each fan-shaped blade (201), and the high-pressure nozzles (203) are set with their jet angle at an upward angle of 10°±2°.

8. The precise control device for the top of the deep-buried cast-in-place pile according to claim 1, characterized in that, The limiting cage (3) is composed of multiple horizontally spaced second annular ribs (301) arranged from bottom to top and longitudinal ribs (304) arranged at equal intervals along the circumference of the multiple second annular ribs (301) and fixed on the outer wall of each second annular rib (301).

9. The precise control device for the top of the deep-buried cast-in-place pile according to claim 1, characterized in that, The pile head cleaning system also includes a trolley (5) and an adjustable pressure high-pressure pump system (6); wherein, the trolley (5) has a freely movable power system, which is equipped with a motor that can be connected to the top of the rotating rod (4) and drive the rotating rod (4) to rotate at high speed and move up and down; the adjustable pressure high-pressure pump system (6) is set on the trolley (5), and its water outlet is connected to the top of the rotating rod (4) to pump high-pressure water into the central through hole of the rotating rod (4).

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