CN216950286U - Gas lift reverse circulation secondary hole cleaning structure - Google Patents

Abstract

The utility model relates to the technical field of building construction, and discloses a gas lift reverse circulation secondary hole cleaning structure, which comprises a hole cleaning pipeline, an air compressor, a sedimentation tank and a pressure relief device; the pressure relief device comprises a seat body, wherein a positioning hole is formed in the seat body; one end of the hole cleaning pipeline extends to the position of a hole to be cleaned, and the other end of the hole cleaning pipeline penetrates through the positioning hole and extends into the sedimentation tank; a PVC blast pipe is arranged in the hole cleaning pipeline, one end of the PVC blast pipe extends to the position of a hole to be cleaned, and the other end of the PVC blast pipe is connected with an air compressor; high-pressure compressed air generated by an air compressor is delivered to a position to be cleaned and is mixed with slurry in the hole, so that a slurry-air mixture with the density smaller than that of the slurry is formed in the hole cleaning pipeline, negative pressure is formed at the bottom end of the air supply pipe, the pressure difference between the inside and the outside of the hole cleaning pipeline is continuously increased by continuously delivering the compressed air, and the slurry-air mixture flows upwards along the hole cleaning pipeline after a certain pressure difference is reached; one end of the hole cleaning pipeline is fixed through the pressure relief device, so that the hole cleaning pipeline is effectively prevented from being pressed and disorderly strung in the mud backflow process.

Description

Gas lift reverse circulation secondary hole cleaning structure

Technical Field

The utility model relates to the technical field of building construction, in particular to a gas lift reverse circulation secondary hole cleaning structure.

Background

Before pouring the pile body concrete, the cast-in-place pile must detect the sediment thickness at the bottom of the hole according to the requirement, if the sediment thickness exceeds the design requirement, then need carry out the clear hole of secondary. The hole cleaning principle is that the circulating mud is utilized to make sediment at the bottom of a hole in a suspension state, and then the sediment is taken out of a pile hole along with the circulating mud by utilizing the adhesive force of mud colloid.

For large-diameter ultra-deep cast-in-place piles with pile diameter larger than 2m and pile depth larger than 60m, the secondary hole cleaning usually adopts a gas lift reverse circulation process. Clear hole of usual gas lift reverse circulation secondary generally adopts and to converge into mud with high compressed air with the air compressor machine through the air supply rubber tube to transfer the pipeline of slagging tap, then utilize the inside and outside pressure differential of pipeline of slagging tap, make mud along the pipeline of slagging tap upstream, along with the pipeline of slagging tap flows out, nevertheless because the high compressed air of air compressor machine input, the pressure that produces the pipeline of slagging tap when leading to mud outflow pipeline is too big, lead to the one end of slagging tap pipeline to swing in disorder, lead to the problem that the slag liquid flies in disorder.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a gas lift reverse circulation secondary hole cleaning structure, and aims to solve the problems that in the prior art, when secondary hole cleaning is carried out, a slag discharging pipeline swings in disorder and slag liquid flies in disorder due to overlarge pressure on the slag discharging pipeline.

The utility model is realized in this way, the gas lift reverse circulation secondary hole cleaning structure comprises a hole cleaning pipeline, an air compressor, a sedimentation tank and a pressure relief device; the pressure relief device comprises a seat body, wherein a positioning hole is formed in the seat body; one end of the hole cleaning pipeline extends to the position of a hole to be cleaned, and the other end of the hole cleaning pipeline penetrates through the positioning hole and extends into the sedimentation tank; the hole cleaning pipeline is internally provided with a PVC air supply pipe, one end of the PVC air supply pipe extends to the position of a hole to be cleaned, and the other end of the PVC air supply pipe extends to the outside of the hole cleaning pipeline and is connected with the air compressor.

Further, from top to bottom, the cross-sectional area of pedestal gradually increases.

Further, the positioning holes are arranged in a downward bending mode.

Furthermore, the outer surface of the seat body is provided with an outlet end which is communicated with the positioning hole; a connecting rod is arranged right above the outlet end, a positioning part is arranged at the end part of the connecting rod, and the positioning part is downward in a V shape.

Furthermore, the outer surface of the seat body is provided with a fixing seat for fixing the connecting rod, the fixing seat comprises two positioning blocks which are hinged, a positioning space is formed between the two positioning blocks, and the end parts of the two positioning blocks are fixed through nuts and threads to fix the connecting rod in the positioning space.

Further, the positioning blocks are arranged in a bending mode towards the direction of the positioning section.

Furthermore, two sides of the seat body are respectively provided with a lantern ring, the lantern rings are sleeved with positioning rods, and the positioning rods are in threaded connection with the lantern rings; the positioning rods are longitudinally arranged, and the downward ends of the positioning rods are in a taper shape.

Furthermore, clear hole pipeline includes joint return bend, mud pipeline, mud circulating line, the both ends of joint return bend are connected respectively the mud pipeline with mud circulating line, mud circulating line extends to the position of waiting to clear the hole, mud pipeline extends to the sedimentation tank.

Further, the PVC blast pipe is positioned in the slurry circulation pipeline.

Further, the joint elbow is in a curved arrangement; an inner joint is arranged in the joint elbow, one end of the inner joint is connected with an air supply rubber pipe through a connecting hole in the joint elbow, and the air supply rubber pipe is connected with the air compressor; the other end of the internal joint is connected with the PVC blast pipe.

Compared with the prior art, the gas lift reverse circulation secondary hole cleaning structure provided by the utility model has the advantages that high-pressure compressed air generated by the air compressor is sent to the position to be cleaned through the air supply pipe and is mixed with slurry in the hole, as the specific gravity of the compressed air sent into the hole is smaller than that of the slurry in the hole, a slurry-gas mixture with the density smaller than that of the slurry is formed in the hole cleaning pipeline, negative pressure is formed at the bottom end of the air supply pipe in the hole cleaning pipeline, the pressure difference between the inside and the outside of the hole cleaning pipeline is continuously increased by continuously conveying the compressed air, and when a certain pressure difference is reached, the slurry-gas mixture in the hole cleaning pipeline flows upwards along the hole cleaning pipeline; the section of the hole cleaning pipeline is greatly smaller than the annular section area between the outer wall of the hole cleaning pipeline and the pile wall, so that reverse circulation with great flow speed and flow is formed, sediments in the circulating slurry carrying hole return from the hole cleaning pipeline and flow to the sedimentation tank on the ground, one end of the hole cleaning pipeline extending into the sedimentation tank penetrates through the positioning hole, the position of one end of the hole cleaning pipeline is fixed through the pressure relief device, and the problem that the hole cleaning pipeline is pressed and disorderly strung in the slurry backflow process is effectively avoided.

Drawings

FIG. 1 is a schematic plan view of a large-diameter ultra-deep pile gas-lift reverse circulation secondary hole cleaning slurry circulation structure provided by an embodiment of the utility model;

FIG. 2 is a schematic front view of a positioning frame according to an embodiment of the present invention;

FIG. 3 is a schematic cross-sectional view of a pressure relief device provided by an embodiment of the present invention;

FIG. 4 is a schematic diagram of a front view of a fitting elbow provided by an embodiment of the utility model;

fig. 5 is a perspective view of an inner joint according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and do not limit the utility model.

The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms may be understood by those skilled in the art according to specific circumstances.

The following detailed description of implementations of the utility model refers to specific embodiments.

Referring to fig. 1-5, a preferred embodiment of the present invention is provided.

The gas lift reverse circulation secondary hole cleaning structure comprises a hole cleaning pipeline, an air compressor 100 and a sedimentation tank 500; the hole cleaning pipeline is communicated with the position of the hole to be cleaned and the sedimentation tank 500, the air compressor 100 is communicated with the PVC air supply pipe 410, the PVC air supply pipe 410 is located in the hole cleaning pipeline and extends to the position of the hole to be cleaned, high-compressed air is supplied to the position of the hole to be cleaned through the PVC air supply pipe 410 by the air compressor 100 and is mixed with slurry in the hole, and therefore the slurry at the position of the hole to be cleaned is cleaned to the sedimentation tank 500 through pressure difference, and the hole cleaning purpose is achieved.

Further, the gas lift reverse circulation secondary hole cleaning structure comprises a pressure relief device, the pressure relief device comprises a base body 600, and a positioning hole 610 is formed in the base body 600; one end of the hole cleaning pipeline extends to the position of a hole to be cleaned, the other end of the hole cleaning pipeline penetrates through the positioning hole 610 and extends into the sedimentation tank 500, the other end of the hole cleaning pipeline is fixed by the base body 600, and therefore the situation that in the process that slurry flows out of the sedimentation tank 500, the other end of the hole cleaning pipeline swings due to overlarge impact force is avoided.

In the gas lift reverse circulation secondary hole cleaning structure, high-pressure compressed air generated by the air compressor 100 is delivered to the position to be cleaned through the PVC air delivery pipe 410 and is mixed with slurry in the hole, because the specific gravity of the compressed air delivered into the hole is smaller than that of the slurry in the hole, a slurry-gas mixture with the density smaller than that of the slurry is formed in the hole cleaning pipeline, negative pressure is formed at the bottom end of the PVC air delivery pipe 410 in the hole cleaning pipeline, the pressure difference between the inside and the outside of the hole cleaning pipeline is continuously increased by continuously delivering the compressed air, and when a certain pressure difference is achieved, the slurry-gas mixture in the hole cleaning pipeline flows upwards along the hole cleaning pipeline; because the section of the hole cleaning pipeline is greatly smaller than the annular section area between the outer wall of the hole cleaning pipeline and the pile wall, reverse circulation with high flow speed and high flow is formed, sediments in the circulating slurry carrying hole return from the hole cleaning pipeline and flow to the sedimentation tank 500 on the ground, one end of the hole cleaning pipeline extending into the sedimentation tank 500 penetrates through the positioning hole 610, the position of one end of the hole cleaning pipeline is fixed through the pressure eliminating device, and the phenomenon that the hole cleaning pipeline is pressed to be disordered and stringed in the slurry backflow process is effectively avoided.

From top to bottom, the cross-sectional area of pedestal 600 crescent, makes the stability of pedestal 600 increase, and it is better to eliminate the pressure effect.

Furthermore, the positioning hole 610 is arranged in a downward bending manner, so that the other end port of the hole cleaning pipeline passing through the positioning hole 610 faces downward and just faces the sedimentation tank 500, and the mud in the hole cleaning pipeline is ensured to smoothly flow out to the sedimentation tank 500.

The outer surface of the seat body 600 is provided with an outlet end which is communicated with the positioning hole 610; be equipped with connecting rod 630 directly over the exit end, the tip of connecting rod 630 is equipped with location portion 620, location portion 620 is "V" style of calligraphy down, location portion 620 supports the other end of pressing clear hole pipeline, thereby stabilize clear hole pipeline once more, and the surface of pedestal 600 is equipped with the fixing base that is used for fixed connection pole 630, the fixing base includes two articulated locating pieces 640 of arranging, form the location space between two locating pieces 640, the tip of two locating pieces 640 passes through nut thread tightening, fix connecting rod 630 in the location space.

For the clear hole pipeline that the diameter is different, when the diameter of clear hole pipeline was less than the diameter of locating hole 610, the location effect of locating hole 610 reduced, at this moment, through the height of adjusting location portion 620, made location portion 620 support and withheld clear hole pipeline, will clear hole pipeline location in locating hole 610 to guarantee better location effect.

Further, locating piece 640 arranges towards the orientation bending of the interval of location, and two locating pieces 640 encircle the interval of location, fix connecting rod 630, and the locating piece 640 that the bending was arranged more laminates with connecting rod 630, and fixed effect is better to make location portion 620 better to the location effect of clear hole pipeline.

The two sides of the seat body 600 are respectively provided with a lantern ring, the lantern ring is sleeved with a positioning rod, and the positioning rod is in threaded connection with the lantern ring; the locating rods are longitudinally arranged, the downward ends of the locating rods are in a taper shape, and one ends of the locating rods are inserted into the ground, so that the stability of the seat body 600 is kept.

The hole cleaning pipeline comprises a joint elbow 200, a slurry pipeline 300 and a slurry circulating pipeline 400, two ends of the joint elbow 200 are respectively connected with one end of the slurry pipeline 300 and one end of the slurry circulating pipeline 400, the other end of the slurry pipeline 300 extends to the sedimentation tank 500, and the other end of the slurry circulating pipeline 400 extends to a sediment position in a hole;

the PVC blast pipe 410 is arranged in the slurry circulation pipeline 400, one end of the PVC blast pipe 410 is communicated with the blast rubber pipe 420, and the other end of the PVC blast pipe 410 extends towards the position of the sediments in the hole; air supply hose 420 is connected with air compressor 100.

Specifically, the secondary hole cleaning process flow of the large-diameter ultra-deep pile gas-lift reverse circulation mud circulation joint elbow 200 is as follows:

1. Installing an orifice irrigation conduit, namely a mud circulation pipe 400;

1) after the final hole is checked and accepted, immediately starting the perfusion preparation work;

2) when the mud circulation pipeline 400 is placed, a worker aligns the mud circulation pipeline 400 at a central position right above the orifice and then starts to put down the mud circulation pipeline 400;

3) and when the mud circulation pipe is lowered to the upper part of the mud circulation pipe and is fixed at a position which is about 30cm away from the orifice, the next mud circulation pipe is hoisted and is connected firmly in sequence until the mud circulation pipe reaches the hole cleaning position, and the mud circulation pipeline 400 is fixed at the orifice.

2. A PVC blast pipe 410 is lowered; the PVC blast pipe 410 in this embodiment is a PVC pipe with an outer diameter of 50mm and a wall thickness of 3mm, and is configured without a joint in the whole pipe, so as to ensure good air tightness and shorten the lowering time of the deep hole.

1) Firstly, a worker shifts the whole PVC blast pipe 410 to the position where the slurry circulation pipeline 400 is placed; the length of the PVC blast pipe 410 in the guide pipe is generally about 2/3 of the drilling depth, in order to make the placement quick, a counterweight is specially arranged at the bottom of the PVC blast pipe, and three reinforcing steel bars with the diameter of 22mm and the length of about 100cm are bound with the PVC blast pipe to increase the weight of the PVC blast pipe;

2) before the PVC blast pipe 410 is lowered, whether the seal at the bottom end of the PVC blast pipe 410 and the balance weight at the lower end are firm or not and whether the PVC blast hole is smooth or not are checked;

3) When the PVC air supply pipe 410 is started to be lowered, 1 worker controls the lowering of the PVC air supply pipe, and the other worker is used for smoothing in a matched mode until the PVC air supply pipe 410 reaches the hole cleaning position.

3. The PVC air pipe in the slurry circulation pipeline 400 is connected with the joint elbow pipe 200;

1) lifting the joint elbow 200 to the orifice by using a crane, wherein the joint elbow 200 is provided with an internal joint 230, one end of the internal joint 230 is butted with a connecting joint of a PVC blast pipe 410 arranged in the slurry circulating pipeline 400, and the other end of the internal joint 230 extends to the outside of the joint elbow 200 and is connected with a blast rubber pipe 420; wherein, the two ends of the inner joint 230 are provided with first connection discs 240, and the two ends of the inner joint 230 extend outwards to form extension sections; one end of the PVC air supply pipe 410, one end of the air supply rubber pipe 420, which is connected with the internal joint 230, are respectively provided with a second connecting disc 480, the first connecting disc 240 and the second connecting disc 480 are respectively provided with a plurality of threaded holes 250, the plurality of threaded holes 250 are arranged at intervals, and the first connecting disc 240 and the threaded holes 250 on the second connecting disc 480 are in one-to-one correspondence.

The two extension sections of the internal joint 230 are respectively embedded into the PVC blast pipe 410 and the blast rubber hose 420, and the first connection disc 240 and the second connection disc 480 are fixed by screws through the first connection disc 240 and the second connection disc 480, so that the PVC blast pipe 410 and the blast rubber hose 420 are communicated by the internal joint 230.

2) The joint elbow 200 is connected to the mud circulation line 400.

4. The joint elbow 200 is connected with the PVC blast pipe 410 and the air compressor 100;

1) placing the air compressor 100 at a designated position, and connecting a PVC blast pipe 410 to an air outlet of the air compressor 100 through a blast rubber pipe 420;

(2) the inner fitting 230 is connected to the fitting elbow 200 with a nut threaded to ensure good gas tightness.

5. The joint elbow 200 is connected with a slurry pipeline 300, in the embodiment, the slurry pipeline 300 adopts a rubber pipe with 12-inch signal, and the length is determined according to the arrangement of field pipelines;

1) the slurry pipeline 300 is connected to the slurry outlet of the joint elbow 200 through a steel wire;

2) the reverse circulation system generates large pressure, so the output amount of slurry is large, the slurry returning quickly can cause the rubber tube to swing, and the tail end of the slurry rubber tube is arranged on a pressure-relieving device.

6. Starting the air compressor 100 to supply air for secondary hole cleaning; in this embodiment, ZHIGAO 90SDY air compressor 100 is adopted, and the air displacement is 12.8m³A/min air compressor 100 with power of 90 kw;

1) opening the air compressor 100, and starting to perform secondary hole cleaning;

2) in the secondary hole cleaning process, the joint elbow 200 is always suspended by the crane, and the slurry circulating pipeline 400 can be lifted up and down slightly to keep the hole cleaning effect.

3) When cleaning the hole, the amount of the mud returning to the sedimentation tank 500 from the mud circulation pipeline 400 is always kept balanced with the amount of the mud returning to the hole, so that the height of the mud surface in the hole is ensured, and the hole wall is stable.

4) In the hole cleaning process, people are periodically sent to measure the sediment thickness and the slurry performance index in the hole, and after the design and standard requirements are met, secondary hole cleaning is finished.

According to the large-diameter ultra-deep pile gas-lift reverse circulation secondary hole cleaning system, high-pressure air generated by the air compressor 100 is directly fed into the pouring guide pipe, so that reverse circulation with extremely high flow speed and flow is generated, and the problems of poor air supply effect, low hole cleaning efficiency and the like in the traditional method are fundamentally solved.

The whole gas lift reverse circulation secondary hole cleaning system is simple in structure, easy to machine on site, connected by bolts and steel wires and convenient to install and operate.

When the whole gas-lift reverse circulation secondary hole cleaning system is installed on site, the requirement can be met by only 2-3 operators, the hole cleaning speed is high, and the work efficiency is greatly improved; the reusable structure has strong applicability and greatly reduces the construction cost.

The joint elbow 200 is arranged in a bent manner, two ends of the joint elbow 200 are respectively connected with the slurry pipeline 300 and the slurry circulating pipeline 400, and the joint elbow 200 can be made of a steel tubular elbow structure; the joint elbow 200 is provided with a connection hole through which the air supply hose 420 extends into the slurry circulation pipe 400 to be connected to one end of the PVC air supply pipe 410.

The end that connects return bend 200 and mud pipe 300 is first butt joint end, the surface of first butt joint end is equipped with a plurality of mounting grooves, the mounting groove includes first trench 210 and second trench 220, the one end of first trench 210 extends towards the direction of mud pipe 300, the other end of first trench 210 is linked together with the one end of second trench 220, the other end of second trench 220 is crooked and extends towards the direction of mud pipe 300 and arranges, and have the interval between the port position of the other end of second trench 220 and first butt joint end, form the location end.

Correspondingly, the diameter of the slurry pipeline 300 is larger than that of the joint elbow 200, a bump is arranged on the inner wall of one end, butted with the joint elbow 200, of the slurry pipeline 300, during installation, the bump enters from one end of the first slot 210, moves towards the other end of the first slot 210, then enters the second slot 220, and finally the slurry pipeline 300 is rotated to enable the bump to move along the bending direction of the second slot 220 until the bump is consistent with the end position of the other end of the second slot 220; as mud flows from the joint elbow 200 towards the mud pipe 300, it exerts an impulse on the mud pipe 300 in a direction away from the joint elbow 200, and the projections are located at the locating ends to securely fasten the mud pipe 300 to the joint elbow 200.

Further, in order to enable air generated by the air compressor 100 to be smoothly conveyed to the bottom of the filling duct, the bottom of the other end of the PVC air supply pipe 410 is blocked to form a blocking end, so that slurry is prevented from entering from the other end of the PVC air supply pipe 410 to affect the air supply effect; and a plurality of air outlet holes 440 for high-pressure air to flow out are arranged in the range of 100cm upwards from the bottom, the diameter of the air outlet holes 440 is 5mm, the hole spacing is 15cm, the air outlet holes 440 are arranged at intervals along the length direction of the PVC air supply pipe 410, and the air outlet holes 440 are uniformly arranged on two sides of the air supply pipe.

Further, be equipped with the locating rack in the mud circulation pipeline 400, the other end through locating rack location PVC blast pipe 410, because the input be highly-compressed air, then can produce certain influence to PVC blast pipe 410, for example position change etc. in the secondary clear hole in-process, it is best to clear up the effect that PVC blast pipe 410 is located the middle part of mud circulation pipeline 400, it can make highly-compressed air distribute from the middle part of mud circulation pipeline 400, ensure that the peripheral pressure value of mud circulation pipeline 400 inner wall is unanimous, like this, the pressure differential is just unanimous inside and outside mud circulation pipeline 400, thereby it is even to make mud circulation pipeline 400 get into the sediment volume in the mud circulation pipeline 400 all around, the big circumstances that the pressure differential is little on the one side can not appear, under the inconsistent circumstances of peripheral pressure differential, the position that the pressure is big easily produces the cave in, thereby reduce clear hole efficiency.

The positioning frame comprises a sleeve 450 and a fixing rod 470; the casing 450 is sleeved with the PVC blast pipe 410, both sides of the casing 450 are provided with the frame rods 460, the end parts of the frame rods 460 fix one end of the fixing rod 470, and the frame rods 460 have elasticity; the other end of the fixing rod 470 extends upward; the mud circulation conduit is provided with a mounting hole, the other end of the fixing rod 470 penetrates through the mounting hole, and the outer surface of the other end of the fixing rod 470 is in a thread shape; two fixing pieces are connected to the fixing rod 470 in a threaded manner and are respectively positioned on the inner side and the outer side in the mounting hole.

Since the rack bar 460 has elasticity, when the width of the entire positioning bracket is greater than the diameter of the slurry circulation pipeline 400, the rack bar 460 is bent, and since the plurality of air outlet holes 440 are uniformly distributed on both sides of the PVC air supply duct 410, the rack bar 460 can be arranged on the other two sides of the PVC air supply duct 410 except for the two sides provided with the air outlet holes 440, thereby preventing the rack bar 460 from weakening the effect of the high pressure air flowing out of the air outlet holes 440.

A positioning groove is formed in the inner wall of the slurry circulation pipeline 400, one end of the positioning groove extends to the mounting hole, and the other end of the positioning groove extends downwards; the depth of the section of the positioning groove is gradually reduced along the direction from one end of the positioning groove to the other end of the positioning groove; the dead lever 470 imbeds in the constant head tank, plays the positioning action to dead lever 470, and the locating rack removes when avoiding the mud sediment backward flow.

The above description is intended to be illustrative of the preferred embodiment of the present invention and should not be taken as limiting the utility model, but rather, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the utility model.

Claims (10)

1. The gas lift reverse circulation secondary hole cleaning structure is characterized by comprising a hole cleaning pipeline, an air compressor, a sedimentation tank and a pressure relief device; the pressure relief device comprises a seat body, wherein a positioning hole is formed in the seat body; one end of the hole cleaning pipeline extends to the position of a hole to be cleaned, and the other end of the hole cleaning pipeline penetrates through the positioning hole and extends into the sedimentation tank; the hole cleaning pipeline is internally provided with a PVC air supply pipe, one end of the PVC air supply pipe extends to the position of a hole to be cleaned, and the other end of the PVC air supply pipe is connected with the air compressor.

2. The gas lift reverse circulation secondary hole cleaning structure as claimed in claim 1, wherein the cross-sectional area of the base body is gradually increased from top to bottom.

3. The gas lift reverse circulation secondary hole cleaning structure as claimed in claim 1, wherein said positioning holes are arranged in a downward bent manner.

4. The gas-lift reverse circulation secondary hole cleaning structure as claimed in any one of claims 1 to 3, wherein the outer surface of the seat body has an outlet end, and the outlet end is communicated with the positioning hole; a connecting rod is arranged right above the outlet end, a positioning part is arranged at the end part of the connecting rod, and the positioning part is downwards V-shaped.

5. The gas-lift reverse-circulation secondary hole cleaning structure as claimed in claim 4, wherein the outer surface of the seat body is provided with a fixing seat for fixing the connecting rod, the fixing seat comprises two positioning blocks which are hinged to each other, a positioning space is formed between the two positioning blocks, and the ends of the two positioning blocks are fixed by nuts and threads to fix the connecting rod in the positioning space.

6. The gas lift reverse circulation secondary hole cleaning structure as claimed in claim 5, wherein the positioning blocks are arranged in a curved manner in a direction toward the positioning space.

7. The gas lift reverse circulation secondary hole cleaning structure according to any one of claims 1 to 3, wherein two sides of the seat body are respectively provided with a lantern ring, the lantern rings are sleeved with positioning rods, and the positioning rods are in threaded connection with the lantern rings; the positioning rods are longitudinally arranged, and one downward ends of the positioning rods are in a taper shape.

8. A gas lift reverse circulation secondary hole cleaning structure as claimed in any one of claims 1 to 3, wherein the hole cleaning pipeline comprises a joint elbow, a mud pipeline and a mud circulation pipeline, two ends of the joint elbow are respectively connected with the mud pipeline and the mud circulation pipeline, the mud circulation pipeline extends to a position to be cleaned, and the mud pipeline extends to the sedimentation tank.

9. A gas lift reverse circulation secondary hole cleaning structure as claimed in claim 8, wherein said PVC blast pipe is located in said mud circulation pipe.

10. The gas lift reverse circulation secondary hole cleaning structure of claim 9, wherein the joint elbow is in a curved arrangement; an inner joint is arranged in the joint bent pipe, one end of the inner joint is connected with an air supply rubber pipe through a connecting hole in the joint bent pipe, and the air supply rubber pipe is connected with the air compressor; the other end of the internal joint is connected with the PVC blast pipe.

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