DCM cement mixing pile ship upper and lower spouting port combined structure

Abstract

The application relates to a deep cement mixing pile ship, in particular to a combined structure of upper and lower cement spraying ports for a DCM cement mixing pile ship, which comprises four drill rods arranged in an array, a central pipe arranged in a region surrounded by the four drill rods, and a driving device capable of driving the central pipe to vertically move relative to the drill rods; a clamping part is arranged between the lower part of the central pipe and the first drill rod, and a roller assembly is arranged between the lower part of the central pipe and the second drill rod; the central pipe has a vertical moving state and a vertical stable state; when the central pipe is in the vertical moving state, a gap is formed between the clamping part and the central pipe, and the central pipe is in rolling cooperation with the roller assembly; when the central pipe is in the vertical stable state, the clamping parts on the two sides of the central pipe jointly clamp the central pipe. The combined structure of upper and lower cement spraying ports for the DCM cement mixing pile ship can adjust the relative height of the upper cement spraying port and the lower cement spraying port, so that the complex geological conditions on the site can be more effectively coped with, and better construction quality and effect can be achieved.

Description

Technical Field

[0001] This invention relates to a deep cement mixing pile vessel, and more particularly to a combined upper and lower spray nozzle structure for a DCM cement mixing pile vessel. Background Technology

[0002] Deep cement mixing piles utilize cement as a hardening agent, forcibly mixing soft soil or sand with the hardening agent in the foundation using deep mixing machinery, thereby hardening the soft foundation and increasing its strength. This method is suitable for soft foundation treatment of near-shore foundations such as wharves, breakwaters, airports, and undersea tunnels, with significant results. Currently, the main method for constructing deep cement mixing piles is to use a deep cement mixing vessel (DCM) to reinforce the foundations of wharves, breakwaters, airports, and undersea tunnels using the DCM method.

[0003] Patent: Underwater Deep Foundation Treatment Three-Pile Four-Axis Engineering Vessel (Application No.: 201711067542.0) discloses a deep cement mixing pile vessel, including drill rods and a central pipe. This type of deep cement mixing pile vessel includes a hull, with a pile frame at the end of the hull. A four-axis mixing pile machine is installed on the pile frame. The lower structure of the four-axis mixing pile machine is specifically as follows... Figure 1 As shown, the system includes four drill rods 2 arranged in an array. A mixing blade assembly 3 is installed at the lower part of each drill rod 2 for mixing operations. A grouting nozzle, designated as the lower grouting nozzle 92, is located near the mixing blade assembly 3. The lower grouting nozzle 92 is used to spray grout into the surrounding soil during the mixing operation of the mixing blade assembly 3. A central pipe 1 is located within the area enclosed by the four drill rods 2. A grouting nozzle, designated as the upper grouting nozzle 91, is located at the lower part of the central pipe 1. The central pipe 1 serves as the corresponding grouting pipe for the upper grouting nozzle. Generally, the upper grouting nozzle 91 is located 3-5 meters above the lower grouting nozzle 92. Cement grout is sprayed from both the upper and lower grouting nozzles 91 and 92, effectively improving the mixing uniformity and construction quality of the cement-soil DCM pile.

[0004] Because my country has a very long coastline and many ports, and the depth of soft soil foundations varies greatly in different places, existing cement mixing pile equipment can only be used for soft soil reinforcement under normal circumstances. When encountering relatively thin or thick soft soil foundations, the effect of soft soil foundation reinforcement is not ideal. Summary of the Invention

[0005] The purpose of this invention is to address the problem that existing technologies do not achieve ideal results in soft soil reinforcement when encountering relatively thin or thick soft soil foundations, and to provide a combined upper and lower spray nozzle structure for DCM cement mixing piles on ships.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A combined structure of upper and lower spray nozzles for DCM cement mixing piles on ships includes four drill rods arranged in an array. Two diagonally opposite drill rods are defined as first drill rods, and the other two diagonally opposite drill rods are defined as second drill rods. A central pipe is arranged within the area enclosed by the four drill rods. An upper spray nozzle is located at the lower part of the central pipe, and a lower spray nozzle is located at the lower part of each drill rod. The upper spray nozzle is positioned higher than the lower spray nozzle.

[0008] It also includes a drive mechanism that can drive the central tube to move vertically relative to the drill pipe;

[0009] A clamping part is provided between the lower part of the central tube and the first drill rod, and a roller assembly is provided between the lower part of the central tube and the second drill rod. The central tube has a vertically moving state and a vertically stable state.

[0010] When the central tube is in a vertically moving state, there is a gap between the clamping part and the central tube, and the central tube and the roller assembly are in rolling cooperation;

[0011] When the central tube is in a vertically stable state, the clamping parts on both sides of the central tube clamp the central tube together.

[0012] The present application describes a combined structure of upper and lower spray nozzles for a DCM cement mixing pile ship. When in operation, the central tube is in a vertically stable state, and the clamping parts on both sides of the central tube clamp the central tube together, so that the lower part of the central tube is fixed relative to the drill rod, thereby enabling the central tube to cooperate with the drill rod to complete the mixing and spraying operation.

[0013] When it is necessary to adjust the relative height between the upper and lower grouting nozzles, the central tube enters a vertical movement state, the clamping part is released, and a gap is created between the clamping part and the central tube. The drive mechanism is then activated, which drives the central tube to move vertically relative to the drill rod. During this process, the central tube and the roller assembly roll together to ensure the stability of the central tube when moving vertically relative to the drill rod. Once the relative height between the upper and lower grouting nozzles is adjusted to the correct position, the central tube enters a vertically stable state. At this time, the clamping parts on both sides of the central tube clamp the central tube together to ensure that the lower part of the central tube is fixed relative to the drill rod during subsequent operations.

[0014] In summary, the combined upper and lower spray nozzle structure for DCM cement mixing piles described in this application can more effectively cope with complex geological conditions on site by adjusting the relative height of the upper spray nozzle and the lower spray nozzle, thereby achieving better construction quality and results.

[0015] Preferably, a first telescopic mechanism is connected between the central tube and the clamping part, and the first telescopic mechanism drives the clamping part to move closer to or away from the central tube.

[0016] Preferably, the roller assembly includes at least two rollers, wherein the at least two rollers are arranged circumferentially along the central tube.

[0017] The roller assembly consists of at least two sets, arranged opposite to each other. Each set of roller assemblies has at least two rollers arranged circumferentially along the central tube, thus forming at least four rollers that can collectively limit the radial sway of the lower part of the central tube.

[0018] Preferably, when the central tube is in a vertically stable state, there is a gap between the central tube and the roller assembly.

[0019] Specifically, a second telescopic mechanism is connected between the central tube and the roller assembly, and the second telescopic mechanism drives the roller assembly to move closer to or away from the central tube.

[0020] The central tube is separated from the roller assembly to facilitate the cleaning of sludge between the central tube and the roller assembly.

[0021] Preferably, a sleeve connection device is rotatably fitted between the clamping part and the corresponding first drill rod and / or between the roller assembly and the corresponding second drill rod. The sleeve connection device includes a casing frame, an upper annular plate, and a lower annular plate, all sleeved on the outside of the corresponding drill rod. The upper and lower annular plates are both connected to the drill rod. The upper and lower annular plates are spaced apart along the length of the drill rod. The casing frame includes a casing. A first annular protrusion extends inward from the upper part of the casing, and a second annular protrusion extends inward from the lower part of the casing. The upper and lower annular plates are both located between the first and second annular protrusions. A wear-resistant layer arranged in annularly is provided between the upper annular plate and the first annular protrusion. The wear-resistant layer protrudes from the upper annular plate along the radial direction of the corresponding drill rod.

[0022] By setting an upper annular plate and a lower annular plate, excessive displacement of the clamping part and roller assembly along the length of the drill rod is avoided. At the same time, the clamping part and the corresponding first drill rod are rotated together, and / or the roller assembly and the corresponding second drill rod are rotated together, by relying on the wear-resistant layer and the upper annular plate as the contact surface, or the wear-resistant layer and the first annular protrusion as the contact surface.

[0023] Preferably, it includes a first valve, a second valve, and a third valve that are independently configured.

[0024] The lower part of the central tube is provided with an annular surface, which is spherical. Multiple first slurry outlets and multiple second slurry outlets are provided on the annular surface. The slurry outlets of the first slurry outlets are radially upward along the spherical surface, and the slurry outlets of the second slurry outlets are radially downward along the spherical surface. At least a portion of the first slurry outlets are connected to the first valve, and at least a portion of the second slurry outlets are connected to the second valve.

[0025] The lower part of the annular surface is connected to a conical surface with the small end pointing downwards. Several third slurry outlets are provided on the annular surface. The slurry outlets are radially downwards along the conical surface. At least some of the third slurry outlets are connected to the third valve.

[0026] The first, second, and third valves are set independently, allowing for the selection of the slurry outlet. The slurry outlets of the first, second, and third outlets have different slurry discharge directions. By switching on or off one or two of the first, second, and third valves, the slurry discharge direction at the bottom of the central tube can be changed.

[0027] Preferably, a one-way valve is connected to the first slurry outlet, the second slurry outlet, and / or the third slurry outlet.

[0028] Preferably, the lower part of the drill rod is provided with a stirring blade assembly, and at least part of the stirring blade assembly is oscillating.

[0029] Preferably, the stirring blade assembly includes a base, an inner cavity with an open end, a rotating shaft at the opening of the inner cavity, a blade connected to one side of the rotating shaft, and a support structure on the other side of the rotating shaft. The rotating shaft, the blade, and the support structure are integrally formed. The support structure is located within the inner cavity. An arc-shaped sealing gasket with the axis of the rotating shaft as its center is provided between the rotating shaft and the base. A driving device capable of driving the rotating shaft to rotate is provided on the base. An arc-shaped guide rod with the axis of the rotating shaft as its center is also provided within the inner cavity, and the arc-shaped guide rod passes through the support structure.

[0030] Preferably, the blade is provided with a lower slurry nozzle and also includes a slurry channel, which is connected to the corresponding lower slurry nozzle after passing through a support structure, a rotating shaft and the blade in sequence.

[0031] Preferably, the driving device is a hydraulic cylinder, which is disposed in the inner cavity and located on one side of the support structure. One end of the hydraulic cylinder is connected to the base, and the other end is connected to the support structure.

[0032] The support structure is driven to rotate around the rotating shaft by a hydraulic cylinder, which in turn causes the blades on the other side of the rotating shaft to swing around the rotating shaft. This solution is simple and convenient.

[0033] Preferably, the driving device is a hydraulic cylinder, which is disposed in the inner cavity and located on one side of the support structure. One end of the hydraulic cylinder is connected to the base, and the other end is connected to the support structure through a tension / compression sensor.

[0034] The torque applied to the blade can be accurately measured using tension and compression sensors.

[0035] Preferably, a first hydraulic bag is provided on one side of the support structure, and a second hydraulic bag is provided on the other side of the support structure, wherein the first hydraulic bag and the second hydraulic bag are filled with liquid or gas.

[0036] When the support structure needs to rotate toward the second hydraulic bag, liquid or gas is filled into the first hydraulic bag, and the second hydraulic bag expands and increases in volume, thereby abutting the support structure as it rotates toward the second hydraulic bag. At this time, the liquid or gas in the second hydraulic bag flows back, making room.

[0037] When the support structure needs to rotate toward the first hydraulic bag, liquid or gas is filled into the second hydraulic bag. The second hydraulic bag expands and its volume increases, thereby abutting the support structure as it rotates toward the first hydraulic bag. At this time, the liquid or gas in the first hydraulic bag flows back, making room.

[0038] Preferably, some of the stirring blade assemblies are differential blade groups, wherein the rotational speed of the differential blade group about the corresponding drill rod is different from the rotational speed of the other stirring blade assemblies about the corresponding drill rod.

[0039] Differential speeds are created by using different mixing blade assemblies rotating around the corresponding drill rod to prevent the formation of clay balls, while ensuring more thorough mixing of the soil, thereby increasing the uniformity of the cement mixing pile.

[0040] Preferably, the differential blade assembly includes a differential sleeve and differential blades, the differential sleeve is sleeved on the outer side of the drill pipe, the differential blade assembly is connected to the outer side of the differential sleeve, and a damper is provided between the drill pipe and the differential sleeve.

[0041] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0042] 1. The combined upper and lower spray nozzle structure for DCM cement mixing piles on ships described in this application can more effectively cope with complex geological conditions on site by adjusting the relative height of the upper spray nozzle and the lower spray nozzle, thereby achieving better construction quality and effect. Attached Figure Description

[0043] Figure 1This is a schematic diagram of the lower structure of a four-axis mixing pile machine in the background technology.

[0044] Figure 2 This is a schematic diagram of the combined upper and lower spray nozzle structure for a DCM cement mixing pile ship according to the present invention.

[0045] Figure 3 This is a schematic diagram of the arrangement of the clamping part and roller assembly of the present invention (the clamping part releases the central tube).

[0046] Figure 4 This is a schematic diagram of the arrangement of the clamping part and roller assembly of the present invention (the clamping part clamps the central tube).

[0047] Figure 5 This is a schematic diagram showing the assembly of the sleeve holder, lower annular plate, and upper annular plate of the present invention.

[0048] Figure 6 This is the invention Figure 5 Enlarged schematic diagram of section A in the middle.

[0049] Figure 7 This is a schematic diagram of the arrangement of the differential blades of the present invention (the first arc-shaped convex surface and the second arc-shaped convex surface are separated).

[0050] Figure 8 This is a schematic diagram of the arrangement of the upper spray nozzles of the present invention.

[0051] Figure 9 This is a schematic diagram of the structure of the stirring blade assembly (driving device) of the present invention.

[0052] Figure 10 This is a schematic diagram of the structure of the stirring blade assembly (hydraulic bag) of the present invention.

[0053] Figure 11 This is a schematic diagram of the arrangement of the differential blades of the present invention (the first arc-shaped convex surface and the second arc-shaped convex surface are separated).

[0054] Figure 12 This is an appendix to the present invention. Figure 11 Enlarged schematic diagram of section B in the middle. Detailed Implementation

[0055] The present invention will now be described in detail with reference to the accompanying drawings.

[0056] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0057] Example 1

[0058] like Figure 2As shown in this embodiment, a combined structure of upper and lower spray nozzles for DCM cement mixing piles on ships includes a drive mechanism 4 and four drill rods 2 arranged in an array. Two diagonally opposite drill rods 2 are defined as first drill rods 21, and the other two diagonally opposite drill rods 2 are defined as second drill rods 22. A central tube 1 is arranged within the area enclosed by the four drill rods 2. An upper spray nozzle 91 is provided at the lower part of the central tube 1, and a lower spray nozzle 92 is provided at the lower part of each drill rod 2. The upper spray nozzle 91 is positioned higher than the lower spray nozzle 92. The drive mechanism 4 can drive the central tube 1 to move vertically relative to the drill rods 2. A clamping part 23 is provided between the lower part of the central tube 1 and the first drill rod 21, and a roller assembly 24 is provided between the lower part of the central tube 1 and the second drill rod 22. The central tube 1 has a vertically moving state and a vertically stable state.

[0059] When the central tube 1 is in a vertically moving state, there is a gap between the clamping part 23 and the central tube 1, and the central tube 1 and the roller assembly 24 are in rolling cooperation.

[0060] When the central tube 1 is in a vertically stable state, the clamping parts 23 on both sides of the central tube 1 clamp the central tube 1 together.

[0061] A first grouting channel 16 is provided axially inside the drill pipe 2. The first grouting channel 16 is connected to the lower grouting nozzle 92 and provides grout to the lower grouting nozzle 92. A second grouting channel 17 is provided axially inside the central pipe 1. The second grouting channel 17 is connected to the upper grouting nozzle 91 and provides grout to the upper grouting nozzle 91.

[0062] The upper part of the central pipe 1 is connected to a flexible hose, which is connected to the second grouting channel 17. During the vertical movement of the central pipe 1 relative to the drill rod 2, the flexible hose is always in a relaxed state, thereby preventing the flexible hose from detaching from the central pipe 1 due to tension during the vertical movement of the central pipe 1 relative to the drill rod 2. The flexible hose needs to meet the grouting pressure.

[0063] The present application describes a combined structure of upper and lower spray nozzles for a DCM cement mixing pile on a ship. When in operation, the central pipe 1 is in a vertically stable state, and the clamping parts 23 on both sides of the central pipe 1 clamp the central pipe 1 together, so that the lower part of the central pipe 1 is fixed relative to the drill rod 2, thereby enabling the central pipe 1 to cooperate with the drill rod 2 to complete the mixing and spraying operation.

[0064] When it is necessary to adjust the relative height between the upper grouting nozzle 91 and the lower grouting nozzle 92, the central tube 1 enters a vertical movement state, the clamping part 23 is released, and a gap is formed between the clamping part 23 and the central tube 1. The drive mechanism 4 is activated, which drives the central tube 1 to move vertically relative to the drill rod 2. During this process, the central tube 1 and the roller assembly 24 roll together to ensure the stability of the central tube 1 when moving vertically relative to the drill rod 2. After the relative height between the upper grouting nozzle 91 and the lower grouting nozzle 92 is adjusted to the correct position, the central tube 1 enters a vertically stable state. At this time, the clamping parts 23 on both sides of the central tube 1 clamp the central tube 1 together to ensure that the lower part of the central tube 1 is fixed relative to the drill rod 2 during subsequent operations.

[0065] In summary, the combined upper and lower spray nozzle structure for DCM cement mixing piles on ships described in this application can more effectively cope with complex geological conditions on site by adjusting the relative height of the upper spray nozzle 91 and the lower spray nozzle 92, thereby achieving better construction quality and results.

[0066] Specifically, the drive mechanism 4 includes a motor 41, the output end of which is driven and connected to a gear rack pair. Specifically, the output end of the motor 41 is driven and connected to the gear 42 in the gear rack pair, the gear 42 meshes with the rack 43, and the rack 43 is arranged on the upper part of the central tube 1 along the length direction of the central tube 1.

[0067] The motor 41 is mounted on the support platform 18, which is mounted on the pile frame or hull of the deep cement mixing pile vessel.

[0068] Example 2

[0069] like Figure 3 and 4 As shown in the figure, the DCM cement mixing pile marine upper and lower spray nozzle combination structure described in this embodiment is based on embodiment 1. A first telescopic mechanism 25 is connected between the central pipe 1 and the clamping part 23. The first telescopic mechanism 25 drives the clamping part 23 to move closer to or away from the central pipe 1.

[0070] Specifically, the roller assembly 24 includes at least two rollers 27, wherein the at least two rollers 27 are arranged circumferentially along the central tube 1.

[0071] The roller assembly 24 consists of at least two sets, which are arranged opposite to each other. Each set of roller assembly 24 has at least two rollers 27 arranged circumferentially along the central tube 1, so that at least four rollers 27 can exist to jointly limit the radial swing of the lower part of the central tube 1.

[0072] Based on the above, in a further preferred embodiment, when the central tube 1 is in a vertically stable state, there is a gap between the central tube 1 and the roller assembly 24.

[0073] Specifically, a second telescopic mechanism 26 is connected between the central tube 1 and the roller assembly 24, and the second telescopic mechanism 26 drives the roller assembly 24 to move closer to or away from the central tube 1.

[0074] The central tube 1 is separated from the roller assembly 24 to facilitate the cleaning of sludge between the central tube 1 and the roller assembly 24.

[0075] like Figure 5 and 6 As shown, the clamping part 23 is rotatably engaged with the corresponding first drill rod 21 by a sleeve device, and the roller assembly 24 is rotatably engaged with the corresponding second drill rod 22 by a sleeve device. The sleeve device includes a casing frame 72, an upper annular plate 73, and a lower annular plate 71, all sleeved on the outside of the corresponding drill rod 2. The upper annular plate 73 and the lower annular plate 71 are both connected to the drill rod 2, and the upper annular plate 73 and the lower annular plate 71 are spaced apart along the length direction of the drill rod 2. The casing frame 72 includes a casing 76, with a first annular protrusion 75 extending inward from the upper part of the casing 76 and a second annular protrusion 77 extending inward from the lower part of the casing 76. The upper annular plate 73 and the lower annular plate 71 are both located between the first annular protrusion 75 and the second annular protrusion 77. A wear-resistant layer 74 arranged in annular shape is provided between the upper annular plate 73 and the first annular protrusion 75. The wear-resistant layer 74 protrudes from the upper annular plate 73 along the outer end of the corresponding drill rod 2 radially.

[0076] By setting an upper annular plate 73 and a lower annular plate 71, excessive displacement of the clamping part 23 and the roller assembly 24 along the length of the drill rod 2 is avoided. At the same time, the clamping part 23 and the corresponding first drill rod 21 are rotated together, and / or the roller assembly 24 and the corresponding second drill rod 22 are rotated together, by using the wear-resistant layer 74 and the upper annular plate 73 as the contact surface, or the wear-resistant layer 74 and the first annular protrusion 75 as the contact surface.

[0077] The roller assembly 24 and the clamping part 23 are respectively connected to the corresponding sleeve holder 72.

[0078] For ease of installation, the sleeve support 72 can also be made into two semi-circular structures. During installation, the two semi-circular structures are welded or bolted together to form the sleeve support 72.

[0079] A connecting rod 28 is provided between adjacent casing frames 72. The connecting rod 28 can form a relatively stable whole between the roller assembly 24 and the clamping part 23, and at the same time can restrict the roller assembly 24 or the clamping part 23 from rotating around the corresponding drill pipe 2.

[0080] The wear-resistant layer 74, the upper annular plate 73, or the first annular protrusion 75 are made of wear-resistant alloys such as 35CrMo and 40Cr, or ceramic structures.

[0081] Example 3

[0082] like Figure 8 As shown, the DCM cement mixing pile shipborne upper and lower spray nozzle combination structure described in this embodiment differs from Embodiment 2 in that it includes a first valve, a second valve, and a third valve that are independently set.

[0083] The lower part of the central tube (1) is provided with an annular surface (11), which is spherical. The annular surface (11) is provided with multiple first slurry outlets (13), multiple second slurry outlets (14) and multiple third slurry outlets (15) arranged vertically in layers:

[0084] The first slurry outlet (13) has an upward slurry outlet along the radial direction of the spherical surface, the second slurry outlet (14) has a horizontal slurry outlet along the radial direction of the spherical surface, and the third slurry outlet (15) has a downward slurry outlet along the radial direction of the spherical surface. At least a portion of the first slurry outlet (13) is connected to the first valve, at least a portion of the second slurry outlet (14) is connected to the second valve, and at least a portion of the third slurry outlet (15) is connected to the third valve.

[0085] Specifically, the first slurry outlet (13) is set in the radial direction of the spherical surface at an angle upward, the second slurry outlet (14) is set horizontally, and the third slurry outlet (15) is set in the radial direction of the spherical surface at an angle downward.

[0086] Furthermore, the lower part of the annular surface 11 is provided with a conical surface 12 with the small end pointing downwards. When the central tube 1 encounters soil with high hardness during its descent, it can be broken or guided to one side by the conical surface 12.

[0087] Furthermore, a plurality of third slurry outlets 15 are provided on the annular surface 11, and the slurry outlets 15 are radially downward along the conical surface 12. At least some of the third slurry outlets 15 are connected to the third valve.

[0088] The first, second, and third valves are set independently, and the outlets from which slurry can be discharged can be selected independently. The discharge directions of the first outlet 13, the second outlet 14, and the third outlet 15 are different. By switching on or off one or two of the first, second, and third valves, the discharge direction of the lower part of the central pipe 1 can be changed.

[0089] Based on the above, in a further preferred embodiment, a one-way valve is connected to the first slurry outlet 13, the second slurry outlet 14 and / or the third slurry outlet 15.

[0090] Example 4

[0091] like Figure 9 and 10 As shown in the figure, the combination structure of upper and lower spray nozzles for DCM cement mixing piles in this embodiment differs from that in embodiment 2 or 3 from that in embodiment 1: the lower part of the drill rod 2 is provided with a mixing blade assembly 3, and at least part of the mixing blade assembly 3 can swing.

[0092] Specifically, the stirring blade assembly 3 includes a base 31, an inner cavity 32 with an open end is provided inside the base 31, a rotating shaft 30 is provided at the opening of the inner cavity 32, a blade 33 is connected to one side of the rotating shaft 30, and a support structure 34 is provided on the other side of the rotating shaft 30. The rotating shaft 30, the blade 33 and the support structure 34 are integrally formed. The support structure 34 is located inside the inner cavity 32. An arc-shaped sealing gasket 35 with the axis of the rotating shaft 30 as the center is provided between the rotating shaft 30 and the base 31. A driving device 36 capable of driving the rotating shaft 30 to rotate is provided on the base 31. An arc-shaped guide rod 37 with the axis of the rotating shaft 30 as the center is also provided inside the inner cavity 32. The arc-shaped guide rod 37 passes through the support structure 34.

[0093] The end of the rotating shaft 30 is rotatably connected to the base 31 via a bearing, which must be a waterproof bearing.

[0094] like Figure 9 As shown, in a preferred embodiment, the driving device 36 is a hydraulic cylinder, which is disposed within the inner cavity 32 and located on one side of the support structure 34. One end of the hydraulic cylinder is connected to the base 31, and the other end is connected to the support structure 34. The hydraulic cylinder drives the support structure 34 to rotate around the rotating shaft 30, thereby causing the blades 33 on the other side of the rotating shaft 30 to oscillate around the rotating shaft 30. This solution is simple and convenient, but it places high demands on the sealing of the arc-shaped sealing gasket 35.

[0095] More specifically, the driving device 36 is a hydraulic cylinder, which is disposed in the inner cavity 32 and located on one side of the support structure 34. One end of the hydraulic cylinder is connected to the base 31, and the other end is connected to the support structure 34 through the tension and pressure sensor 61.

[0096] The torque on the blade 33 can be accurately measured by the tension / compression sensor 61.

[0097] like Figure 10 As shown, in another preferred embodiment, a first hydraulic bag 38 is provided on one side of the support structure 34, and a second hydraulic bag 39 is provided on the other side of the support structure 34. The first hydraulic bag 38 and the second hydraulic bag 39 are filled with liquid or gas.

[0098] When the support structure 34 needs to rotate toward the second hydraulic bag 39, liquid or gas is filled into the first hydraulic bag 38, and the second hydraulic bag 39 expands and becomes larger, thereby abutting the support structure 34 as it rotates toward the second hydraulic bag 39. At this time, the liquid or gas in the second hydraulic bag 39 flows back, making room.

[0099] When the support structure 34 needs to rotate toward the first hydraulic bag 38, liquid or gas is filled into the second hydraulic bag 39. The second hydraulic bag 39 expands and its volume increases, thereby abutting the support structure 34 as it rotates toward the first hydraulic bag 38. At this time, the liquid or gas in the first hydraulic bag 38 flows back, making room, and its sealing requirements for the arc-shaped sealing gasket 35 are lower.

[0100] The first hydraulic bag 38 and the second hydraulic bag 39 are made of PP or PE polymer plastic.

[0101] It is worth noting that the contraction or expansion of the first hydraulic bag 38 and the second hydraulic bag 39 does not mean that the materials used to make the first hydraulic bag 38 and the second hydraulic bag 39 must have contraction or expansion properties. They only need to be flexible and able to withstand the pressure of liquid or gas entering them.

[0102] Preferably, the blade 33 is provided with a lower slurry nozzle 92 and also includes a slurry channel 93. The slurry channel 93 is connected to the corresponding lower slurry nozzle 92 after passing through the support structure 34, the rotating shaft 30 and the blade 33 in sequence.

[0103] Example 5

[0104] like Figure 5As shown in this embodiment, the combined upper and lower spray nozzle structure for DCM cement mixing piles on ships differs from Embodiments 2, 3, or 4 in that some of the mixing blade assemblies 3 are differential speed blade groups 5. The rotational speed of the differential speed blade group 5 around the corresponding drill rod 2 is different from the rotational speed of the other mixing blade assemblies 3 around the corresponding drill rod 2. This differential speed is achieved by utilizing the different rotational speeds of the different mixing blade assemblies 3 around the corresponding drill rod 2 to prevent clay from adhering to the mixing blades and the fixing frame. Simultaneously, it ensures more thorough mixing of the soil, thereby increasing the uniformity of the cement mixing pile and improving the strength of the cement-soil mixture.

[0105] Specifically, the differential blade assembly 5 includes a differential sleeve 51 and a differential blade 52. The differential sleeve 51 is sleeved on the outside of the drill rod 2. The differential blade assembly 5 is connected to the outside of the differential sleeve 51. A damper 6 is provided between the drill rod 2 and the differential sleeve 51. When the differential blade 52 rotates, the damper 6 applies a force in the opposite direction to the differential blade 52, so that the rotation speed of the differential blade 52 is different from the speed of other mixing blade assemblies 3. When the force of the surrounding soil on the differential blade 52 increases to a certain extent, the differential blade 52 can rotate around the drill rod 2.

[0106] like Figure 7 , 11 As shown in Figure 12, the damper 6 includes an arc-shaped protrusion 62 and an arc-shaped spring piece 61 arranged opposite to each other. There are multiple arc-shaped protrusions 62 and arc-shaped spring pieces 61. The arc-shaped protrusions 62 are arranged circumferentially along the inner wall of the differential sleeve 51. The arc-shaped spring pieces 61 are connected to the outer side of the corresponding drill rod 2, and multiple arc-shaped spring pieces 61 are arranged circumferentially along the corresponding drill rod 2. When the differential blade 52 rotates around the corresponding drill rod 2, the arc-shaped protrusions 62 can abut against the arc-shaped spring pieces 61, causing the arc-shaped spring pieces 61 to undergo elastic deformation. When the arc-shaped spring pieces 61 elastically deform to a certain extent, the arc-shaped protrusions 62 will pass over the arc-shaped spring pieces 61, and the arc-shaped spring pieces 61 will return to the shape before elastic deformation.

[0107] One end of the arc-shaped spring piece 61 is connected to the drill rod 2, and the other end is cantilevered to facilitate the elastic deformation of the arc-shaped spring piece 61. The arc-shaped spring piece 61 has a first arc-shaped convex surface 64, and the arc-shaped protrusion 62 has a second arc-shaped convex surface 65. The first arc-shaped convex surface 64 and the second arc-shaped convex surface 65 are arranged opposite to each other and can abut against each other.

[0108] The root of the arc-shaped spring piece 61 is provided with a guide slope 63, which can be formed by fillet weld. The guide slope 63 can be used to guide the deformation of the cantilever end of the adjacent arc-shaped spring piece 61.

[0109] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A combined structure of upper and lower spray nozzles for DCM cement mixing piles on ships, comprising four drill rods (2) arranged in an array, wherein two diagonally opposite drill rods (2) are defined as first drill rods (21), and the other two diagonally opposite drill rods (2) are defined as second drill rods (22). A central pipe (1) is provided within the area enclosed by the four drill rods (2). An upper spray nozzle (91) is provided at the lower part of the central pipe (1), and a lower spray nozzle (92) is provided at the lower part of each drill rod (2). The upper spray nozzle (91) is positioned higher than the lower spray nozzle (92). The structure is characterized in that: It also includes a drive mechanism (4) that can drive the central tube (1) to move vertically relative to the drill rod (2); A clamping part (23) is provided between the central tube (1) and the first drill rod (21), and a roller assembly (24) is provided between the central tube (1) and the second drill rod (22). The central tube (1) has a vertically moving state and a vertically stable state. When the central tube (1) is in a vertically moving state, there is a gap between the clamping part (23) and the central tube (1), and the central tube (1) and the roller assembly (24) are in rolling cooperation; When the central tube (1) is in a vertically stable state, the clamping parts (23) on both sides of the central tube (1) clamp the central tube (1) together. A first telescopic mechanism (25) is connected between the central tube (1) and the clamping part (23). The first telescopic mechanism (25) drives the clamping part (23) to move closer to or away from the central tube (1). And / or, The roller assembly (24) includes at least two rollers (27), wherein the at least two rollers (27) are arranged circumferentially along the central tube (1).

2. The combined upper and lower spray nozzle structure for DCM cement mixing piles on ships according to claim 1, characterized in that, The clamping part (23) and the corresponding first drill rod (21) are rotatably fitted with a sleeve device, and / or the roller assembly (24) and the corresponding second drill rod (22) are rotatably fitted with a sleeve frame (72) which includes a sleeve frame (72) sleeved on the outside of the corresponding drill rod (2), an upper annular plate (73) and a lower annular plate (71). The upper annular plate (73) and the lower annular plate (71) are both connected to the drill rod (2). The upper annular plate (73) and the lower annular plate (71) are spaced apart along the length of the drill rod (2). 2) Includes a casing (76), with a first annular protrusion (75) extending inward from the upper part of the casing (76) and a second annular protrusion (77) extending inward from the lower part of the casing (76). The upper annular plate (73) and the lower annular plate (71) are both located between the first annular protrusion (75) and the second annular protrusion (77). A wear-resistant layer (74) arranged in annular shape is provided between the upper annular plate (73) and the first annular protrusion (75). The wear-resistant layer (74) protrudes from the upper annular plate (73) along the radial direction of the corresponding drill rod (2).

3. The combined structure of upper and lower spray nozzles for DCM cement mixing piles on ships according to claim 1, characterized in that: This includes a first valve, a second valve, and a third valve that are set independently of each other; The lower part of the central tube (1) is provided with an annular surface (11), which is spherical. The annular surface (11) is provided with multiple first slurry outlets (13), multiple second slurry outlets (14) and multiple third slurry outlets (15) arranged vertically in layers. The first slurry outlet (13) has an upward slurry outlet along the radial direction of the sphere, the second slurry outlet (14) has a horizontal slurry outlet along the radial direction of the sphere, and the third slurry outlet (15) has a downward slurry outlet along the radial direction of the sphere. At least a portion of the first slurry outlet (13) is connected to the first valve, at least a portion of the second slurry outlet (14) is connected to the second valve, and at least a portion of the third slurry outlet (15) is connected to the third valve.

4. The combined upper and lower spray nozzle structure for DCM cement mixing piles on ships according to claim 3, characterized in that, One-way valves are connected to the first slurry outlet (13), the second slurry outlet (14) and / or the third slurry outlet (15).

5. A combined structure of upper and lower spray nozzles for DCM cement mixing piles on ships according to any one of claims 1-4, characterized in that, The lower part of the drill rod (2) is provided with a stirring blade assembly (3), and at least part of the stirring blade assembly (3) is oscillating.

6. The combined structure of upper and lower spray nozzles for DCM cement mixing piles on ships according to claim 5, characterized in that, The stirring blade assembly (3) includes a base (31), an inner cavity (32) with an opening at one end is provided in the base (31), a rotating shaft (30) is provided at the opening of the inner cavity (32), a blade (33) is connected to one side of the rotating shaft (30), and a support structure (34) is provided on the other side of the rotating shaft (30). The rotating shaft (30), the blade (33) and the support structure (34) are integrally formed. The support structure (34) is located in the inner cavity (32). An arc-shaped sealing gasket (35) with the axis of the rotating shaft (30) as the center is provided between the rotating shaft (30) and the base (31). A driving device (36) capable of driving the rotating shaft (30) to rotate is provided on the base (31). An arc-shaped guide rod (37) with the axis of the rotating shaft (30) as the center is also provided in the inner cavity (32). The arc-shaped guide rod (37) passes through the support structure (34). The blade (33) is provided with a lower grouting nozzle (92) and also includes a grouting channel (93). The grouting channel (93) is connected to the corresponding lower grouting nozzle (92) after passing through the support structure (34), the rotating shaft (30) and the blade (33) in sequence.

7. A combined structure of upper and lower spray nozzles for DCM cement mixing piles on ships according to any one of claims 6, characterized in that: The driving device (36) is a hydraulic cylinder. The hydraulic cylinder is located in the inner cavity (32) and is located on one side of the support structure (34). One end of the hydraulic cylinder is connected to the base (31), and the other end is connected to the support structure (34) through the tension and pressure sensor (61). or, A first hydraulic bag (38) is provided on one side of the support structure (34), and a second hydraulic bag (39) is provided on the other side of the support structure (34). The first hydraulic bag (38) and the second hydraulic bag (39) are filled with liquid or gas.

8. The combined structure of upper and lower spray nozzles for DCM cement mixing piles on ships according to claim 7, characterized in that: Some of the stirring blade assemblies (3) are differential blade groups (5), and the rotation speed of the differential blade group (5) around the corresponding drill rod (2) can be different from the rotation speed of the other stirring blade assemblies (3) around the corresponding drill rod (2).

9. The combined structure of upper and lower spray nozzles for DCM cement mixing piles on ships according to claim 8, characterized in that: The differential blade assembly (5) includes a differential sleeve (51) and differential blades (52). The differential sleeve (51) is sleeved on the outside of the drill rod (2). The differential blade assembly (5) is connected to the outside of the differential sleeve (51). A damper (6) is provided between the drill rod (2) and the differential sleeve (51).

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