CN216588466U - Multistage circulation treatment system for slurry of cast-in-situ bored pile in limited space of deep water area - Google Patents

Abstract

The utility model relates to a multistage circulation treatment system for drilling bored concrete pile slurry in a limited space of a deep water area, which consists of a reverse circulation drill rod, a slurry conveying pipe, a construction platform, a steel casing, a filter basket, a slurry lifting pump, a slurry lifting pipe, a spiral separation device, a support frame, a chute and a slag collecting barrel; the construction platform is erected by depending on a steel casing, the filter basket is erected on the steel casing, the filter basket is multi-stage, the spiral separation device is erected above the primary filter basket, the upper end of the chute is aligned with a slag hole in the slag collecting ring, and the lower end of the chute extends into the slag collecting barrel; the slurry containing slag pumped out by the reverse circulation drill rod enters the spiral separation device through the slurry conveying pipe, the slurry containing slag is primarily separated into slurry and drilling slag in the spiral separation device, the slurry is stored in the steel casing below after being subjected to multi-stage filtration by the filter basket, and the slurry in the steel casing is pumped into the next stage of filter basket through the slurry lifting pump and the slurry lifting pipe for filtration. The spiral separation device is driven by flowing slurry, so that the slurry treatment cost can be obviously reduced.

Description

Multistage circulation treatment system for slurry of cast-in-situ bored pile in limited space of deep water area

Technical Field

The utility model relates to a circulating treatment system for cast-in-situ bored pile slurry, in particular to a multistage circulating treatment system for cast-in-situ bored pile slurry in a limited space of a deep water area.

Background

When carrying out deep water district drilling bored concrete pile construction operation, need set up the construction platform on the surface of water, take the structural style of steel-pipe pile + steel truss usually, but because the construction platform is narrow and small, do not have sufficient operating space to set up handling ponds such as mud separation, sediment, storage, use the outside transport of mud ship to handle or protect a section of thick bamboo as the sedimentation tank with the help of the steel of the near pile foundation usually. When the slurry ship is adopted for slurry treatment, the defect of high treatment cost exists, and the slurry ship cannot enter into operation in an area with shallow water level and poor navigation conditions. When the steel casing is used as a sedimentation tank for treatment, the steel casing is easy to fill with a large amount of drilling slag generated in the drilling process due to the small capacity of the steel casing, the drilling slag in the steel casing needs to be continuously cleaned, the treatment efficiency is low, and the requirement of drilling operation is difficult to meet; with the development of construction technology, the drilling slag in the slurry can be actively separated by using a centrifugal machine, and although the drilling slag can be rapidly separated by the method, the drilling slag separation equipment needs an external power source, a large amount of energy is consumed, and the economic benefit is poor.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a multistage circulation treatment system for the slurry of a finite-space cast-in-situ bored pile in a deep water area, aiming at the technical problem of slurry treatment in the finite-space cast-in-situ bored pile construction in the deep water area.

In order to achieve the purpose, the technical scheme of the utility model is as follows:

the utility model relates to a multistage circulation treatment system for drilling bored concrete pile slurry in a limited space of a deep water area, which consists of a reverse circulation drill rod, a slurry conveying pipe, a construction platform, a steel casing, a filter basket, a slurry lifting pump, a slurry lifting pipe, a spiral separation device, a support frame, a chute and a slag collecting barrel; the construction platform is erected by depending on a plurality of steel casing barrels, and the steel casing barrels are driven into a hard soil layer below a riverbed; the filter baskets are arranged on the steel casing in an overlapping mode, the filter baskets are multiple and comprise a primary filter basket, a secondary filter basket, a tertiary filter basket and the like, and the slurry lifting pump and the slurry lifting pipe are arranged in the steel casing with the filter baskets; the spiral separation device is erected above the primary filter basket, the spiral separation device is placed on a support frame, and the support frame is supported on the construction platform; the spiral separation device comprises an inner side conical cylinder, a driving blade, a spiral lifting blade, a rotating shaft, an outer side conical cylinder and a movable sealing plug, wherein the driving blade and the spiral lifting blade are fixedly installed on the rotating shaft, the driving blade and the spiral lifting blade are positioned in the inner side conical cylinder, the inner side conical cylinder is positioned in the outer side conical cylinder, the inner side conical cylinder is fixedly connected with the top of the outer side conical cylinder, and annular bottom plates are arranged at the bottoms of the inner side conical cylinder and the outer side conical cylinder; the movable sealing plug is arranged at the top end of the inner side conical cylinder, the outer side conical cylinder is provided with a slag collecting ring, and the slag collecting ring is provided with a slag discharging hole; the upper end of the chute is aligned with a slag hole on the slag collecting ring, the lower end of the chute extends into the slag collecting barrel, and the slag collecting barrel is placed on the construction platform; one end of the slurry conveying pipe is connected with the reverse circulation drill rod, and the other end of the slurry conveying pipe is connected with the bottom end of the inner side conical cylinder of the spiral separation device.

Preferably, the slurry containing slag extracted by the reverse circulation drill rod enters a spiral separation device through a slurry conveying pipe, the slurry containing slag is primarily separated into slurry and drilling slag in the spiral separation device, and the slurry is subjected to multistage filtration through a filter basket; the aperture of the secondary filter basket is smaller than that of the primary filter basket, and the aperture of the tertiary filter basket is smaller than that of the secondary filter basket, so that the filter effect on the drilling slag is improved; the mud filtered by the filter basket is stored in a steel casing below the filter basket, the mud in the steel casing is pumped into the next stage of filter basket through a mud lifting pump and a mud lifting pipe for filtering, and the mud filtered by the third stage of filter basket is pumped into the steel casing where the reverse circulation drill rod and the drill bit are located through the mud lifting pump and the mud lifting pipe.

Preferably, a plurality of slurry outlet holes are formed in the annular bottom plate, the plurality of slurry outlet holes are uniformly formed in the circumferential direction of the annular bottom plate, the sum of the cross-sectional areas of the slurry outlet holes is larger than or equal to the cross-sectional area multiplied by 2 of the slurry conveying pipe, filtered slurry can be rapidly discharged from the spiral separating device, and accumulation of the filtered slurry in the spiral separating device is avoided.

Preferably, collection sediment ring slope sets up, the hole of slagging tap is located the lower one side of collection sediment ring, and the drilling mud falls into collection sediment ring back, because collection sediment ring slope sets up, and the drilling mud will slide into the lower one side of collection sediment ring, then falls into in the chute from the hole of slagging tap of lower one side.

Preferably, the axis of the rotating shaft and the axis of the inner side conical cylinder are in the same straight line, the lower end of the rotating shaft is provided with a bearing, a fixing rod piece is arranged between the bearing and the inner side conical cylinder, one end of the fixing rod piece is fixed with the bearing, and the other end of the fixing rod piece is fixed with the inner side conical cylinder, so that the axis of the rotating shaft and the axis of the inner side conical cylinder are in the same straight line.

Preferably, a limit top plate is arranged at the top of the rotating shaft, the limit top plate is fixed at the top of the rotating shaft through a limit nut, the movable sealing plug penetrates through the rotating shaft, a guide rod is arranged on the movable sealing plug, the guide rod penetrates out of the limit top plate, a compression spring is arranged on the guide rod, the compression spring is in a compression state, one end of the compression spring abuts against the movable sealing plug, and the other end of the compression spring abuts against the limit top plate; the limiting top plate provides support and limiting for the movable sealing plug, the compression spring enables the movable sealing plug to be tightly attached to the top end (closed state) of the inner side conical cylinder to seal the inner side conical cylinder, and after drilling slag in the inner side conical cylinder is accumulated to a certain volume, the movable sealing plug is extruded and pushed to move upwards (open state).

Preferably, the diameter of the inner side cone cylinder is gradually reduced from bottom to top, the inner side cone cylinder is sequentially divided into a reducing acceleration section, a conical lifting section and a drilling slag accumulation section from bottom to top, the reducing acceleration section is a closed section, the conical lifting section and the drilling slag accumulation section are filtering sections, the closed section is made of a closed steel plate, the filtering section is made of a porous steel plate, the driving blade is located in the closed section, and the spiral lifting blade is located in the filtering section; the working principle of the spiral separation device is as follows: the drill bit carries out the drilling operation of drilling on the riverbed, in the drilling process, the reverse circulation drill rod upwards extracts the slurry containing slag, the slurry containing slag enters the inner side cone cylinder through the slurry conveying pipe, the slurry containing slag is accelerated through the reducing acceleration section (namely the closed section), the flow rate of the slurry containing slag is accelerated due to the reduction of the diameter, then the slurry containing slag impacts the driving blade at a high speed, the driving blade drives the rotating shaft to rotate, the rotating shaft simultaneously drives the spiral lifting blade to rotate, the spiral lifting blade upwards lifts the slurry containing slag into the conical lifting section (namely the filtering section), the slurry in the slurry containing slag flows out from the filtering section of the inner side cone cylinder, enters between the inner side cone cylinder and the outer side cone cylinder and then flows out from a slurry outlet hole on the annular bottom plate; drilling slag in the slag-containing slurry is left in the inner conical barrel and continues to move upwards to the drilling slag accumulation section under the action of the spiral lifting blade, the movable sealing plug is jacked up after the drilling slag in the drilling slag accumulation section is accumulated to a certain volume, the drilling slag is extruded out from the top of the inner conical barrel and falls into the slag collecting ring, then the drilling slag falls into the chute from a slag hole in the slag collecting ring, and finally the drilling slag slides into the slag collecting barrel from the chute.

Preferably, the outer diameter of the spiral lifting blade is equal to the inner diameter of the inner side conical cylinder and changes along with the change of the inner diameter of the inner side conical cylinder, so that the lifting and extruding effects of the spiral lifting blade on the slurry containing the slag are guaranteed, and the separation efficiency of the drilling slag and the slurry is guaranteed.

Preferably, the support frame comprises spacing ring, bracing piece, contact rod, the spacing ring is installed in the bracing piece upper end, the contact rod is installed in the middle part of bracing piece, links adjacent bracing piece, promotes the overall stability of support frame.

Compared with the prior art, the technical scheme provided by the utility model has the following beneficial effects:

1. the spiral separation device is driven by the flow of the slurry, an external power source is not required to be arranged, the cost for treating the slurry can be obviously reduced, and the construction cost is saved.

2. The spiral separation device is small in size, is erected above the steel casing through the support frame, cannot occupy the operation space on the construction platform in a large area, and is used for treating and constructing the slurry of the overwater cast-in-situ bored pile with the limited operation space.

3. The spiral separation device has simple and reliable structure, no complex mechanical structure, difficult blockage and other conditions, and convenient maintenance and repair operation.

4. The drilling slag in the slurry is primarily separated by using the spiral separation device, a large amount of drilling slag is separated, then multistage filtration is carried out through the filter baskets arranged at different apertures at the top end of the steel casing, the drilling slag in the slurry is effectively separated, and the performance index of the slurry is ensured to meet the requirement.

5. The mode of circular treatment by adopting the spiral separation device and the multi-stage filter basket has the advantage of good treatment effect; the efficiency of slurry treatment can be adjusted at any time according to the speed of drilling operation, the quality of slurry treatment is not reduced, and the method has the advantages of stability and reliability.

6. The mud is conveyed through the pipeline, and the treated mud is stored in the steel casing and cannot be leaked into a river, so that the pollution to natural water bodies is avoided, and the environment is protected.

Drawings

FIG. 1 is a process schematic diagram of a slurry multi-stage treatment circulation system;

FIG. 2 is a schematic diagram of a process of a drill slag separating device of a spiral separating device (a partial large sample diagram in FIG. 1);

FIG. 3 is a schematic three-dimensional structure of a spiral separation device;

fig. 4 is a schematic three-dimensional structure of the movable sealing plug (partially enlarged in fig. 3);

FIG. 5 is a schematic sectional view of the structure section of the spiral separation device (inner cone);

fig. 6 is a schematic three-dimensional structure of the support frame.

The figure is marked with: 1-reverse circulation drill pipe, 11-drill bit, 12-slurry conveying pipe, 13-construction platform, 14-steel casing, 15-drilling hole, 16-riverbed, 2-slag-containing slurry, 21-drilling slag, 22-slurry, 3-filter basket, 31-first-stage filter basket, 32-second-stage filter basket, 33-third-stage filter basket, 34-slurry lifting pump, 35-slurry lifting pipe, 4-spiral separation device, 41-inner side cone, 411-reducing lifting section, 412-conical lifting section, 413-drilling slag accumulation section, 414-closed section, 415-filter section, 42-driving blade, 43-spiral lifting blade, 44-rotating shaft, 441-bearing, 442-fixed rod piece, 45-outer side cone, 451-annular bottom plate, 452-a pulp outlet, 453-a slag collecting ring, 454-a slag outlet, 46-a movable sealing plug, 461-a guide rod, 462-a compression spring, 463-a limiting top plate, 464-a limiting nut, 5-a support frame, 51-a limiting ring, 52-a support rod, 53-a connecting rod, 61-a chute and 62-a slag collecting barrel.

Detailed Description

For a better understanding of the present invention, the following embodiments will be described in detail with reference to fig. 1 to 6, and the following embodiments are implemented on the premise of the technical solution of the present invention, and the detailed embodiments are given, but the scope of the present invention is not limited to the following embodiments.

As shown in attached drawings 1 and 2, the multistage circulation treatment system for the drilling bored pile slurry in the limited space of the deep water area, which is disclosed by the utility model, comprises a reverse circulation drill rod 1, a slurry conveying pipe 12, a construction platform 13, a steel casing 14, a filter basket 3, a slurry lifting pump 34, a slurry lifting pipe 35, a spiral separation device 4, a support frame 5, a chute 61 and a slag collecting barrel 62; the construction platform 13 is erected by relying on a plurality of steel casing cylinders 14, and the steel casing cylinders 14 are driven into a hard soil layer below a riverbed 16; the filter baskets 3 are arranged on the steel casing 14 in an overlapping mode, the filter baskets 3 are multiple and comprise a primary filter basket 31, a secondary filter basket 32, a tertiary filter basket 33 and the like, and the slurry lifting pump 34 and the slurry lifting pipe 35 are arranged in the steel casing 14 with the filter baskets 3; the spiral separation device 4 is erected above the primary filter basket 31, the spiral separation device 4 is placed on a support frame 5, and the support frame 5 is supported on a construction platform 13; as shown in fig. 3, the spiral separation device 4 is composed of an inner conical cylinder 41, a driving blade 42, a spiral lifting blade 43, a rotating shaft 44, an outer conical cylinder 45 and a movable sealing plug 46, wherein the driving blade 42 and the spiral lifting blade 43 are fixedly mounted on the rotating shaft 44, the driving blade 42 and the spiral lifting blade 43 are located in the inner conical cylinder 41, the inner conical cylinder 41 is located in the outer conical cylinder 45, the inner conical cylinder 41 is fixedly connected with the top of the outer conical cylinder 45, and annular bottom plates 451 are arranged at the bottoms of the inner conical cylinder 41 and the outer conical cylinder 45; the movable sealing plug 46 is arranged at the top end of the inner conical cylinder 41, the outer conical cylinder 45 is provided with a slag collecting ring 453, and the slag collecting ring 453 is provided with a slag hole 454; the upper end of the chute 61 is aligned with a slag hole 454 on the slag collecting ring 453, the lower end of the chute 61 extends into the slag collecting barrel 62, and the slag collecting barrel 62 is placed on the construction platform 13; one end of the slurry conveying pipe 12 is connected with the reverse circulation drill rod 1, and the other end of the slurry conveying pipe 12 is connected with the bottom end of the inner side cone cylinder 41 of the spiral separation device 4.

As shown in fig. 3 and 5, the diameter of the inner cone cylinder 41 is gradually reduced from bottom to top, the inner cone cylinder 41 is sequentially divided into a variable diameter acceleration section 411, a tapered acceleration section 412 and a drilling slag accumulation section 413 from bottom to top, the variable diameter acceleration section 411 is a closed section 414, the tapered acceleration section 412 and the drilling slag accumulation section 413 are filter sections 415, the closed section 414 is made of a closed steel plate, the filter sections 415 are made of a porous steel plate, the driving blade 42 is located in the closed section 414, and the spiral lifting blade 43 is located in the filter sections 415; the outer diameter of the spiral lifting blade 43 is equal to the inner diameter of the inner conical cylinder 41 and changes along with the change of the inner diameter of the inner conical cylinder 41, so that the lifting and extruding effects of the spiral lifting blade 43 on the slag-containing slurry 2 are ensured, and the separation efficiency of the drilling slag 21 and the slurry 22 is ensured. The rotating shaft 44 is aligned with the axis of the inner conical cylinder 41, the bearing 441 is disposed at the lower end of the rotating shaft 44, a fixing rod 442 is disposed between the bearing 441 and the inner conical cylinder 41, one end of the fixing rod 442 is fixed to the bearing 441, and the other end of the fixing rod 442 is fixed to the inner conical cylinder 41, so that the axis of the rotating shaft 44 is aligned with the axis of the inner conical cylinder 41.

As shown in FIG. 3, a plurality of slurry outlet holes 452 are formed in the annular bottom plate 451, the plurality of slurry outlet holes 452 are uniformly arranged along the circumferential direction of the annular bottom plate 451, the sum of the cross-sectional areas of the slurry outlet holes 452 is larger than or equal to the cross-sectional area multiplied by 2 of the slurry conveying pipe 12, and the filtered slurry 22 can be rapidly discharged from the spiral separation device 4 and is prevented from accumulating in the spiral separation device 4. The slag collecting ring 453 is obliquely arranged, the slag hole 454 is positioned on the lower side of the slag collecting ring 453, and after the drilling slag 21 falls into the slag collecting ring 453, the drilling slag 21 slides into the lower side of the slag collecting ring 453 due to the oblique arrangement of the slag collecting ring 453 and then falls into the chute from the slag hole 454 on the lower side.

As shown in fig. 4, a limit top plate 463 is arranged at the top of the rotating shaft 44, the limit top plate 463 is fixed at the top of the rotating shaft 44 through a limit nut 464, the movable sealing plug 46 passes through the rotating shaft 44, a guide rod 461 is arranged on the movable sealing plug 46, the guide rod 461 penetrates out of the limit top plate 463, a compression spring 462 is arranged on the guide rod 461, the compression spring 462 is in a compressed state, one end of the compression spring 462 abuts against the movable sealing plug 46, and the other end of the compression spring 462 abuts against the limit top plate 463; the limit top plate 463 supports and limits the movable sealing plug 46, the compression spring 462 enables the movable sealing plug 46 to be tightly attached to the top end (closed state) of the inner side conical cylinder 41 to seal the inner side conical cylinder 41, and after the drilling slag 21 in the inner side conical cylinder 41 is accumulated to a certain volume, the movable sealing plug 46 is extruded and pushed to move upwards (open state) the movable sealing plug 46.

As shown in the attached figure 1, the slurry 2 containing slag extracted from the reverse circulation drill rod 1 enters the spiral separation device 4 through the slurry conveying pipe 12, the slurry 2 containing slag is primarily separated into slurry 22 and drilling slag 21 in the spiral separation device 4, and the slurry 22 is filtered in multiple stages through the filter baskets 3; the aperture of the secondary filter basket 32 is smaller than that of the primary filter basket 31, and the aperture of the tertiary filter basket 33 is smaller than that of the secondary filter basket 32, so that the filtering effect on the drilling slag 21 is improved; the mud 22 filtered by the filter basket 3 is stored in the steel casing 14 below, the mud 22 in the steel casing 14 is pumped into the next stage filter basket 3 through a mud lifting pump 34 and a mud lifting pipe 35 for filtering, and the mud 22 filtered by the third stage filter basket 33 is pumped into the steel casing 14 where the reverse circulation drill rod 1 and the drill bit 11 are located through the mud lifting pump 34 and the mud lifting pipe 35. As shown in fig. 2, the working principle of the spiral separation device 4 is as follows: the drill bit 11 performs drilling operation of drilling a hole 15 on a river bed 16, during the drilling process, the reverse circulation drill rod 1 upwards extracts slag-containing slurry 2, the slag-containing slurry 2 enters the inner side conical cylinder 41 through the slurry conveying pipe 12, the slag-containing slurry 2 is accelerated through the reducing acceleration section 411 (namely, the closed section 414), the flow rate of the slag-containing slurry 2 is accelerated due to the reduction of the diameter, then the slag-containing slurry 2 impacts the driving blade 43 at a high speed, the driving blade 42 drives the rotating shaft 44 to rotate, the rotating shaft 44 simultaneously drives the spiral lifting blade 43 to rotate, the spiral lifting blade 43 lifts the slag-containing slurry 2 upwards to the conical lifting section 412 (namely, the filtering section 415), and slurry 22 in the slag-containing slurry 2 flows out from the filtering section 415 of the inner side conical cylinder 41, enters between the inner side conical cylinder 41 and the outer side conical cylinder 45 and then flows out from a slurry outlet hole 452 on the annular bottom plate 451; the drilling slag 21 in the slag-containing slurry 2 is left in the inner cone 41 and continues to move upwards to the drilling slag accumulation section 413 under the action of the spiral lifting blade 43, and after the drilling slag 21 in the drilling slag accumulation section 413 is accumulated to a certain volume, the movable sealing plug 46 is jacked up, is extruded from the top of the inner cone 41, falls into the slag collection ring 453, then falls into the chute 61 from the slag outlet 454 in the slag collection ring 453, and finally slides into the slag collection barrel 62 from the chute 61.

As shown in fig. 6, the support frame 5 is composed of a limiting ring 51, a support rod 52 and a connecting rod 53, the limiting ring 51 is installed at the upper end of the support rod 52, the connecting rod 53 is installed in the middle of the support rod 52, and the adjacent support rods 52 are connected to improve the overall stability of the support frame 5.

The present invention has been described in detail with reference to the embodiments, but the description is only for the preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.

Claims (9)

1. The multistage circulation treatment system for the slurry of the cast-in-situ bored pile in the limited space of the deep water area is characterized by comprising a reverse circulation drill rod (1), a slurry conveying pipe (12), a construction platform (13), a steel casing (14), a filter basket (3), a slurry lift pump (34), a slurry lift pipe (35), a spiral separation device (4), a support frame (5), a chute (61) and a slag collecting barrel (62);

the construction platform (13) is erected by depending on a plurality of steel casing cylinders (14), the steel casing cylinders (14) are arranged, and the steel casing cylinders (14) are driven into a hard soil layer below a riverbed (16);

the filter baskets (3) are arranged on the steel casing (14), the filter baskets (3) are multiple and comprise a primary filter basket (31), a secondary filter basket (32) and a tertiary filter basket (33), and the slurry lifting pump (34) and the slurry lifting pipe (35) are arranged in the steel casing (14) with the filter baskets (3);

the spiral separation device (4) is erected above the primary filter basket (31), the spiral separation device (4) is placed on the support frame (5), and the support frame (5) is supported on the construction platform (13); the spiral separation device (4) comprises an inner side conical cylinder (41), a driving blade (42), a spiral lifting blade (43), a rotating shaft (44), an outer side conical cylinder (45) and a movable sealing plug (46), wherein the driving blade (42) and the spiral lifting blade (43) are positioned in the inner side conical cylinder (41) and are fixedly installed on the rotating shaft (44), the inner side conical cylinder (41) is positioned in the outer side conical cylinder (45), the inner side conical cylinder (41) is fixedly connected with the top of the outer side conical cylinder (45), and annular bottom plates (451) are arranged at the bottoms of the inner side conical cylinder (41) and the outer side conical cylinder (45); the movable sealing plug (46) is arranged at the top end of the inner conical cylinder (41), the outer conical cylinder (45) is provided with a slag collecting ring (453), and the slag collecting ring (453) is provided with a slag hole (454);

the upper end of the chute (61) is aligned with a slag hole (454) on the slag collecting ring (453), the lower end of the chute (61) extends into the slag collecting barrel (62), and the slag collecting barrel (62) is placed on the construction platform (13);

one end of the slurry conveying pipe (12) is connected with the reverse circulation drill rod (1), and the other end of the slurry conveying pipe (12) is connected with the bottom end of the inner side conical cylinder (41) of the spiral separation device (4).

2. The deep water area limited space bored pile mud multistage circulation processing system according to claim 1, characterized in that the slurry (2) containing slag extracted from the reverse circulation drill rod (1) enters the spiral separation device (4) through a mud conveying pipe (12), the slurry (2) containing slag is primarily separated into mud (22) and drilling slag (21) in the spiral separation device (4), and the mud (22) is subjected to multistage filtration through the filter basket (3); the aperture of the secondary filter basket (32) is smaller than that of the primary filter basket (31), and the aperture of the tertiary filter basket (33) is smaller than that of the secondary filter basket (32).

3. The multistage circulation treatment system for the drilling-grouting pile slurry in the limited space of the deep water area as claimed in claim 1, wherein a plurality of slurry outlet holes (452) are formed in the annular bottom plate (451), the slurry outlet holes (452) are uniformly formed in the circumferential direction of the annular bottom plate (451), and the sum of the cross-sectional areas of the slurry outlet holes (452) is larger than or equal to the cross-sectional area x 2 of the slurry conveying pipe (12).

4. The deep water area limited space bored pile mud multistage circulation treatment system according to claim 1, characterized in that the slag collecting ring (453) is disposed obliquely, and the slag hole (454) is located at a lower side of the slag collecting ring (453).

5. The deep water area confined space bored pile mud multistage circulation processing system of claim 1, wherein, the axis of the rotating shaft (44) is in line with the axis of the inner side cone (41), the lower end of the rotating shaft (44) is provided with a bearing (441), a fixed rod member (442) is arranged between the bearing (441) and the inner side cone (41), one end of the fixed rod member (442) is fixed with the bearing (441), and the other end of the fixed rod member (442) is fixed with the inner side cone (41).

6. The deep water area limited space bored pile mud multistage circulation processing system of claim 1, characterized by, the pivot (44) top is equipped with spacing roof (463), spacing roof (463) passes through spacing nut (464) and fixes at the pivot (44) top, movable sealing plug (46) passes pivot (44), there is guide bar (461) on the movable sealing plug (46), guide bar (461) is worn out from spacing roof (463), be equipped with compression spring (462) on the guide bar (461), compression spring (462) is in the compression state, compression spring (462) one end is supported on movable sealing plug (46), the other end of compression spring (462) is supported on spacing roof (463).

7. The deep water area finite space bored pile mud multistage circulation processing system of claim 1, characterized in that, the diameter of inside cone section (41) is from bottom to top reduced gradually, inside cone section (41) from bottom to top divides into reducing acceleration section (411), toper promotion section (412), bores the sediment and gathers section (413) in proper order, reducing acceleration section (411) is closed section (414), toper promotion section (412) and bore sediment and gather section (413) for filtration section (415), closed section (414) are made by closed steel plate, filtration section (415) are made by porous steel plate, drive blade (42) are located closed section (414), spiral promotion blade (43) are located filtration section (415).

8. The deep water area confined space bored pile mud multistage circulation processing system of claim 1, wherein the outer diameter of the spiral elevating blade (43) is equal to the inner diameter of the inner side cone (41) and varies with the inner diameter of the inner side cone (41).

9. The multistage circulation treatment system for the limited space bored concrete pile mud in the deep water area according to claim 1, characterized in that the support frame (5) is composed of a limit ring (51), a support rod (52) and a tie rod (53), the limit ring (51) is installed at the upper end of the support rod (52), and the tie rod (53) is installed in the middle of the support rod (52).

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