CN113482530B - Site-limited long-distance large-aperture horizontal directional drilling pipeline back-dragging construction process - Google Patents
Site-limited long-distance large-aperture horizontal directional drilling pipeline back-dragging construction process Download PDFInfo
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- CN113482530B CN113482530B CN202110963341.9A CN202110963341A CN113482530B CN 113482530 B CN113482530 B CN 113482530B CN 202110963341 A CN202110963341 A CN 202110963341A CN 113482530 B CN113482530 B CN 113482530B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
- E21B7/046—Directional drilling horizontal drilling
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/08—Roller bits
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/26—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
- F16L1/024—Laying or reclaiming pipes on land, e.g. above the ground
- F16L1/028—Laying or reclaiming pipes on land, e.g. above the ground in the ground
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
- F16L1/024—Laying or reclaiming pipes on land, e.g. above the ground
- F16L1/06—Accessories therefor, e.g. anchors
Abstract
The application relates to a site-limited long-distance large-aperture horizontal directional drilling pipeline back-dragging construction process, which relates to the technical field of pipeline installation and comprises the following steps: s1, cleaning holes; s2, trying to pull back; s3, back dragging operation preparation, which specifically comprises the following preparation work: the method comprises the following steps of (1) arranging and assembling return dragging pipes, (2) constructing an anticorrosive layer and a protective layer of the return dragging pipes, (3) increasing the balance weight of the return dragging pipes to reduce the return dragging force, (4) hoisting the return dragging pipes, (5) selecting and checking drill rods and drill bits, (6) configuring mud and storing water; s4, back dragging of the first section back dragging pipe; s5, a second section of back dragging pipe back dragging; s6, repeating the step S5 until the last section of back dragging pipe is dragged back into the pipe hole; and S7, carrying out quality inspection on the back dragging pipe after the back dragging is finished. This application is convenient for reduce and is drawn the pipe back and dragging the construction degree of difficulty in the work progress.
Description
Technical Field
The application relates to the technical field of pipeline installation, in particular to a site-limited long-distance large-aperture horizontal directional drilling pipeline back-dragging construction process.
Background
At present, with the development of the urbanization process in China and the gradual maturity and perfection of the trenchless construction technology of pipelines, the horizontal directional drilling technology has the characteristics of low cost, short construction period, safety, environmental protection and the like, is widely accepted in Shanghai, guangzhou, beijing, jiangsu and the like, and starts to be developed rapidly.
Before installing the pipeline, a constructor needs to select a guide drilling-in point and a guide drilling-out point on the road surface, then a horizontal directional drilling machine is installed on one side of the guide drilling-in point, and a drill bit with the radius larger than the pipe diameter of the pipeline to be installed is placed on the guide drilling-out point on the ground. And then connecting a drill rod and a drill bit at the output end of the horizontal directional drilling machine, wherein the radius of the drill bit is smaller than the pipe diameter of the pipeline to be installed, and the drill bit is gradually close to a guide drilling point by gradually increasing the number of the drill rods, so that a guide pipeline with a smaller pipe diameter is formed in the soil.
When the drill bit moves to the guided drilling point, an operator fixedly connects one end of the drill rod close to the guided drilling point with the drill bit with a larger radius. And then the number of the drill rods is reduced one by one, so that the drill rod is driven by the horizontal directional drilling machine to drive the drill bit with larger radius to move to a position close to a guide drilling point along the path of the guide pipeline, and pipe holes for installing the pipeline are formed conveniently.
The horizontal directional drill has a good development prospect as a novel, quick, safe and environment-friendly construction process, but the directional drilling crossing process has many limitations, and the popularization and application of the directional drilling crossing process are limited by special working conditions such as limited pipe dragging field, high rock layer hardness, deep soil covering, difficulty in judging the position of underground water and the like.
The back dragging pipe field is limited to have particularly prominent influence on the horizontal directional drilling process, so that the back dragging pipe is difficult to assemble, and the complete back dragging pipe cannot be prefabricated, so that the back dragging period is increased, the risks of hole collapse and hole shrinkage of the directional drilling are greatly increased, and due to the complex terrain of the construction field, mountains and rivers need to be crossed usually, so that great difficulty is brought to the transportation pipeline, and the situation brings great difficulty to the back dragging pipe construction.
Disclosure of Invention
In order to facilitate reducing the construction difficulty of the back dragging pipe in the back dragging construction process, the application provides a field-limited long-distance large-aperture horizontal directional drilling pipeline back dragging construction process.
The application provides a site-limited long-distance large-aperture horizontal directional drilling pipeline back-dragging construction process adopts the following technical scheme:
the site-limited long-distance large-aperture horizontal directional drilling pipeline back-dragging construction process comprises the following steps:
s1, hole cleaning treatment: an operator firstly places a drill bit on the ground on one side of the guided drilling point, and after one end of the drill rod moves to the guided drilling point, one end of the drill rod is fixedly connected with the drill bit, and then the drill bit is driven by the horizontal directional drilling machine to move along the pipe hole from the guided drilling point to the direction close to the guided drilling point, so that the pipe hole is cleaned; repeating the above operations until no sticking occurs, so as to prepare a back dragging test condition;
s2, trial back dragging operation: an operator firstly places a test return towing pipe on the ground on one side of a guide drilling point, then rotatably connects one end of a drill rod with the test return towing pipe through a drilling tool assembly, and then drives the test return towing pipe to move from the guide drilling point to the direction close to the guide drilling point along a pipe hole through a horizontal directional drilling machine; when an operator takes the trial returning dragging pipe out of the guide drilling point, detecting the abrasion degree of the glass fiber reinforced plastic solidified on the outer side wall of the trial returning dragging pipe, and judging whether hole cleaning treatment needs to be carried out again;
s3, back dragging operation preparation, which specifically comprises the following preparation work:
(1) And the back dragging pipe is arranged and paired: carrying out back-dragging pipe assembly tests for multiple times on site, and determining back-dragging operation modes of back-dragging pipes;
(2) And constructing an anticorrosive coating and a protective layer of the back dragging pipe: protecting pipe bodies and welded junctions of all back-dragging pipes for trial back-dragging operation and formal back-dragging operation by using a 3PE reinforced anticorrosive coating and a glass fiber reinforced plastic protective layer, wherein the glass fiber reinforced plastic protective layer is coated on the outer side of the anticorrosive coating;
(3) And adding a counterweight of the back dragging pipe to reduce back dragging force: in the back dragging operation process, the back dragging force is mainly influenced by the friction force generated by the back dragging pipe due to buoyancy and the upper hole wall of the pipe hole and the friction force generated by the back dragging pipe and the slurry in the moving process of the back dragging pipe in the pipe hole; in order to reduce the influence of the buoyancy between the back dragging pipe and the upper hole wall on the back dragging of the back dragging pipe, a method of injecting water into the back dragging pipe is adopted in the construction process, and the balance weight of the back dragging pipe is increased;
(4) And hoisting the back dragging pipe: the hoisting operation is carried out by a professional hoisting unit, a hoisting scheme is issued, expert demonstration is carried out, and the tonnage and the arrangement position of the crane are checked; in the back dragging process, a crane is matched with an excavator to ensure that a back dragging pipe is always on a soil pile, and the back dragging pipe is adjusted in time after the soil pile is found to be deviated; the method comprises the following steps that trial hoisting operation is carried out on a back dragging pipe before formal hoisting, a sling is forbidden to be placed at a welded junction connected with the back dragging pipe, the hoisting height and swing arm angle of the all-line crane are guaranteed to be uniform in the trial hoisting process, and the trial hoisting height is determined according to a construction site; judging the stress condition of the crane according to the height of the towing-back pipe from the ground and the elastic deformation of the towing-back pipe, and keeping the towing-back pipe in a horizontal state to ensure that the crane is uniformly stressed;
(5) The selection and the inspection of the drill rod and the drill bit are carried out, wherein an operator determines the connection mode of the drill rod and the drill bit according to the condition of back dragging operation, and sends a special person to carry out the inspection one by one before the use of the drill rod and the drill bit, and the inspection is carried out on the buckling type, the thread wear and whether the drill rod and the drill bit have cracks or not;
(6) Slurry preparation and water storage: cleaning a mud pool in advance before construction, inserting a communicating pipe into the mud pool, inserting the other end of the communicating pipe into a guide drilling point, installing a mud pump in the mud pool, communicating the mud pump with a mud pipe, and inserting the other end of the mud pipe into a guide drilling point; a temporary water tank is arranged on the ground on one side of the guided drilling point, a water injection pump is installed in the temporary water tank, and the water injection pump is communicated with a water injection pipe which is conveniently inserted into a pipe cavity of the back dragging pipe;
s4, dragging the first section of dragging pipe: hoisting the first section of the back dragging pipe to a cat back pre-arranged at the guide drilling point by using a crane, wherein the cat back is a mound with a slope surface, and the slope bottom of the slope surface is connected with the guide drilling point of the pipe hole and has the same gradient; fixedly connecting the end part of the drill rod with a barrel type rock reamer, then fixedly connecting the barrel type rock reamer with the front end of the first section of the back dragging pipe through a drilling tool assembly, starting a horizontal directional drilling machine and starting back dragging operation of the first section of the back dragging pipe, starting a water injection pump during the back dragging operation, performing dynamic water injection operation into the pipe cavity of the first section of the back dragging pipe through the water injection pipe connected with the water injection pump to increase the counterweight of the first section of the back dragging pipe, stopping the back dragging operation until the tail end of the first section of the back dragging pipe is 40-44 meters away from the drilling point, and stopping water injection and withdrawing the water injection pipe;
s5, dragging the second section of dragging pipe back:
(1) Welding, detecting and corrosion preventing operation: after the first section of back-dragging pipe is subjected to back-dragging operation, hoisting the second section of back-dragging pipe and coinciding with the axis of the first section of back-dragging pipe, welding and fixing the first section of back-dragging pipe and the second section of back-dragging pipe, and carrying out anti-corrosion and glass fiber reinforced plastic curing treatment on a welding interface and a pipe body;
(2) And water injection back dragging: after the welding, detection and corrosion prevention operations are completely finished, inserting one end of a water injection pipe into a pipe cavity of a second section of return dragging pipe, then starting a horizontal directional drilling machine and starting the return dragging operation of the second section of return dragging pipe, starting a water injection pump during the return dragging operation, performing dynamic water injection operation into the pipe cavity of the second section of return dragging pipe through the water injection pipe connected with the water injection pump to increase the balance weight of the second section of return dragging pipe, stopping the return dragging operation until the tail end distance of the second section of return dragging pipe is guided out of the position of a drilling point by 40-44 meters, and stopping water injection and withdrawing and the water injection pipe;
s6, repeating the step S5 until the last section of back dragging pipe is dragged back into the pipe hole;
s7, after the back dragging is finished, quality inspection is carried out on the back dragging pipe: and after the last section of back dragging pipe finishes back dragging, inspecting the anticorrosive coating and the protective layer of the first section of back dragging pipe with the front end leaking and guided into the drilling point.
By adopting the technical scheme, in the step S1, the horizontal directional drilling machine drives the drill bit to move from the guide drilling point to the guide drilling point in the pipe hole, so that sundry stones in the pipe hole can be taken out, the inner wall of the pipe hole is smooth, and the probability that the sundry stones scratch the return dragging pipe when the subsequent return dragging pipe moves in the pipe hole is reduced;
in the step S2, the trial back-dragging operation is convenient for simulating the moving process of the back-dragging pipe in the pipe hole in advance, so that whether the back-dragging pipe has the back-dragging condition in the pipe hole or not is judged conveniently;
in the step S3, the preparation work of the back dragging work is convenient for preparing trial back dragging work or formal back dragging work, so as to be convenient for the back dragging work of the subsequent back dragging pipe;
in the step S4, firstly, arranging a cat back on the ground on one side of the guide outlet drill hole, hoisting a first section of back dragging pipe on the cat back through a crane, then injecting water into the first section of back dragging pipe for back dragging, stopping back dragging operation when the tail end of the first section of back dragging pipe is 40-44 meters away from the guide outlet drill point after the first section of back dragging pipe is dragged into the pipe hole, stopping injecting water and withdrawing the water injection pipe, and the arrangement of the cat back is convenient for guiding the back dragging of the first section of back dragging pipe, so that the rigid friction between the first section of back dragging pipe and the guide outlet drill point is reduced;
in the step S5, welding and fixing the front end of the second section of the back-dragging pipe and the tail end of the first section of the back-dragging pipe, and then arranging an anticorrosive layer and a curing layer on the welding ports of the first section of the back-dragging pipe and the second section of the back-dragging pipe and the respective pipe bodies;
in the step S6, the step S5 is repeated, and finally a plurality of back dragging pipes can be dragged back into the pipe holes one by one;
in the step S7, the anticorrosive coating and the protective layer of the first section of the back-dragging pipe are inspected, so that the soil condition in the pipe hole can be known conveniently in time, and whether the back-dragging scheme is perfect or not can be verified conveniently;
in conclusion, the hole cleaning treatment is carried out for many times, the back dragging operation is tried to be carried out, and the cat back is arranged to support and guide the back dragging pipe, so that the construction difficulty of the back dragging pipe in the back dragging construction process is reduced conveniently.
Preferably, in the step S2, when the second trial dragging-back operation is finished, and the abrasion degree of the glass fiber reinforced plastics of the trial dragging-back pipe exceeds the set parameter index, the trial dragging-back operation is stopped, and the protective sleeve is inserted into the pipe hole.
By adopting the technical scheme, when the abrasion degree of the glass fiber reinforced plastic of the trial towing pipe exceeds the set parameter index, an operator can judge that more miscellaneous stones exist in the pipe hole, so that the pipe wall structure in the pipe hole can be deduced to be unstable, and the towing operation is carried out under the condition, so that the protective layer and the anticorrosive layer of the towing pipe are easily damaged; after the protection pipe is arranged in the pipe hole, when back dragging operation is carried out in the protection pipe, the probability of contact between the back dragging pipe and sundry stones in the pipe hole is reduced, and therefore the back dragging pipe can be protected.
Preferably, in the step S3, after welding of the two back dragging pipes is completed, at least 24 hours are separated, a shooting detection is performed on the welding port to detect whether the welding seam is complete, and after the detection is qualified, an anticorrosion operation is performed, and after the anticorrosion operation is completed, 3-4 days are separated, a back dragging operation of the next back dragging pipe is performed.
Through adopting above-mentioned technical scheme, in time carry out the film shooting to the welding mouth and detect, be convenient for make the quality of welding mouth higher to when reducing to return and dragging the operation, two return and drag the probability that the pipe takes place to separate.
Preferably, in the step S1, a drill rod is detachably connected to the horizontal directional drilling machine, a cone is fixedly connected to the other end of the drill rod, and a barrel-type rock reamer is fixedly connected to the other end of the cone; the diameter of the roller cone used in the second hole cleaning operation is larger than that of the roller cone used in the first hole cleaning operation.
By adopting the technical scheme, in the process of hole cleaning operation, the horizontal directional drilling machine works to drive the drill rod to rotate, the drill rod rotates to drive the cone to rotate, the cone rotates to drive the barrel type rock reamer to rotate, miscellaneous stones are conveniently scraped from the hole wall of the hole by the rotation of the cone, then the barrel type rock reamer rotates to roll the miscellaneous stones in the hole, so that the miscellaneous stones are conveniently crushed, the number of the drill rods connected to the horizontal directional drilling machine is gradually reduced, the cone and the barrel type rock reamer are driven to move towards the direction close to the guide drilling point, and the crushed stones are conveniently pushed out from the hole; the diameter of the roller cone used in the second hole cleaning operation is larger than that of the roller cone used in the first hole cleaning operation, so that the hole diameter of the pipe hole can be enlarged in the second hole cleaning operation.
Preferably, the drilling tool assembly comprises a back dragging rotary joint arranged at one end of the drill rod, a fixing ring is fixedly connected to the other end of the back dragging rotary joint, a back dragging head is fixedly connected to the other end of the fixing ring, and the other end of the back dragging head is rotatably connected to the front end of the back dragging pipe or the front end of the back dragging pipe at the first section.
By adopting the technical scheme, in the formal back dragging process, the horizontal directional drilling machine works to drive the drill rod to rotate, the drill rod rotates to drive the barrel type rock reamer to rotate, the barrel type rock reamer rotates to drive the back dragging rotary joint to rotate, the back dragging rotary joint rotates to drive the fixing ring to rotate, the fixing ring rotates to drive the back dragging head to rotate, and the back dragging head and the back dragging pipe rotate relatively; the barrel type rock reamer rotates to crush the sundry rocks in the pipe hole, and then the number of drill rods connected to the horizontal directional drilling machine is gradually reduced, so that the barrel type rock reamer and the plurality of back dragging pipes are driven to move towards the direction close to the guide drilling point, the crushed gravels are conveniently pushed out of the pipe hole, and finally the plurality of back dragging pipes can be dragged back into the pipe hole.
Preferably, in the step S1, if the drill sticking phenomenon occurs, the drill rod is timely withdrawn, the large stone blocks in the pipe hole are cleaned after the drill rod is withdrawn, and the soil condition in the pipe hole is analyzed.
By adopting the technical scheme, the operator can analyze the soil condition in the pipe hole, so that the environment in the pipe hole can be analyzed and predicted conveniently, and the operator can make a corresponding treatment scheme conveniently.
Preferably, in the step S3, before the first section of the return pipe and the second section of the return pipe are welded and fixed, the original cat back is removed, the second section of the return pipe is hoisted and supported by using a crane, and after the construction operations of corrosion prevention and glass fiber reinforced plastic curing are completed at the welding interface of the return pipe and the pipe body, the cat back for supporting the second section of the return pipe in a hoisting state is manufactured.
Through adopting above-mentioned technical scheme, the setting of "cat back" is convenient for support and lead the towline, because the one end that is close to the direction in the tube hole and goes out the drill way is the slope form, sets up "cat back" and is convenient for make the inclination of towline and tube hole unanimous back to be convenient for go back the towline and smoothly go back and drag to in the tube hole.
Preferably, in the step S3, slurry is supplied to the pipe hole through a slurry pump in a gap between the two back-dragging pipes in the assembling, welding and corrosion prevention construction.
By adopting the technical scheme, in the process that the back dragging pipe moves in the pipe hole, the mud easily overflows from the pipe hole, and the mud is timely supplemented into the pipe hole, so that the mud quantity in the pipe hole can be kept constant, the back dragging pipe is lubricated, and the friction between the back dragging pipe and the inner wall of the pipe hole is reduced; because the mud amount is dynamically reduced in the moving process of the back dragging pipe, the back dragging pipe in the pipe hole is relatively static at the time of the gap between the two sections of back dragging pipes for assembling, welding and corrosion prevention construction, thereby facilitating the control of the mud amount added into the pipe hole by an operator.
Preferably, in the step S7, the conductivity of the anticorrosive layer is tested by a feeding method, and the nominal conductivity λ of the anticorrosive layer should not be greater than 200 μ S/m 2 。
By adopting the technical scheme, the anti-corrosion layer is detected by an operator by adopting a feed method, so that the method is quick and efficient, the measuring time of the operator is saved, and the construction period is convenient to shorten.
Preferably, in the step S7, after the back dragging operation of the back dragging pipe is completed, the ball passing operation is performed from the direction from the drilling point to the drilling point until accumulated water in the back dragging pipe is drained; then the inner wall of the back dragging pipe is cleaned at least twice by using a high-sealing straight plate pipe cleaner until sundries are not discharged from the pipe orifice of the back dragging pipe.
By adopting the technical scheme, the ball passing operation is used for discharging accumulated water in the back dragging pipe; the inner wall of the back dragging pipe is cleaned by the high-sealing straight plate pipe cleaner, so that the back dragging pipe is kept clean, and a cable and the like are laid in the back dragging pipe.
In summary, the present application includes at least one of the following beneficial technical effects:
in the step S1, the horizontal directional drilling machine drives the drill bit to move from a guide drilling-out point to a guide drilling-in point in the pipe hole, so that sundry stones in the pipe hole can be taken out, the inner wall of the pipe hole is smooth, and the probability that the sundry stones scratch the return dragging pipe when the subsequent return dragging pipe moves in the pipe hole is reduced; in the step S2, the trial back-dragging operation is convenient for simulating the moving process of the back-dragging pipe in the pipe hole in advance, so that whether the back-dragging condition of the back-dragging pipe exists in the pipe hole or not is judged conveniently; in the step S3, the back dragging operation preparation work is convenient for preparing trial back dragging or formal back dragging operation, so as to facilitate the subsequent back dragging operation of the back dragging pipe; in the step S4, firstly, arranging a cat back on the ground on one side of the guide outlet drill hole, hoisting a first section of back dragging pipe on the cat back through a crane, then injecting water into the first section of back dragging pipe for back dragging, stopping back dragging operation when the tail end of the first section of back dragging pipe is 40-44 meters away from the guide outlet drill point after the first section of back dragging pipe is dragged into the pipe hole, stopping injecting water and withdrawing the water injection pipe, and the arrangement of the cat back is convenient for guiding the back dragging of the first section of back dragging pipe, so that the rigid friction between the first section of back dragging pipe and the guide outlet drill point is reduced; in the step S5, welding and fixing the front end of the second section of the back dragging pipe and the tail end of the first section of the back dragging pipe, and then arranging an anticorrosive layer and a curing layer on welding ports of the first section of the back dragging pipe and the second section of the back dragging pipe and respective pipe bodies; in the step S6, the step S5 is repeated, and finally a plurality of back dragging pipes can be dragged back into the pipe holes one by one; in the step S7, an anticorrosive layer and a protective layer of the first section of back-dragging pipe are inspected, so that the soil condition in the pipe hole can be known conveniently in time, and whether the back-dragging scheme is perfect or not can be verified conveniently; in conclusion, the hole cleaning treatment is carried out for many times, the back dragging operation is tried to be carried out, and the cat back is arranged to support and guide the back dragging pipe, so that the construction difficulty of the back dragging pipe in the back dragging construction process is reduced conveniently. (ii) a
In the formal back dragging process, the horizontal directional drilling machine works to drive the drill rod to rotate, the drill rod rotates to drive the barrel type rock reamer to rotate, the barrel type rock reamer rotates to drive the back dragging rotary joint to rotate, the back dragging rotary joint rotates to drive the fixed ring to rotate, the fixed ring rotates to drive the back dragging head to rotate, and the back dragging head and the back dragging pipe rotate relatively; the barrel type rock reamer rotates to crush the miscellaneous rocks in the pipe hole, and then the number of drill rods connected to the horizontal directional drilling machine is gradually reduced, so that the barrel type rock reamer and the multiple back dragging pipes are driven to move towards the direction close to the guide drilling point, the crushed gravels are conveniently pushed out from the pipe hole, and finally the multiple back dragging pipes can be dragged back into the pipe hole;
the cat back is arranged to support and guide the back dragging pipe conveniently, and the cat back is arranged to enable the inclination angle of the back dragging pipe to be consistent with that of the pipe hole conveniently because one end, close to the guide drill outlet, in the pipe hole is inclined, so that the back dragging pipe can be dragged back into the pipe hole smoothly.
Drawings
Fig. 1 is a schematic flow chart of an embodiment of the present application.
Fig. 2 is an exploded view of the drag-back job preparation according to the embodiment of the present application.
FIG. 3 is an exploded view of the second-stage back dragging pipe according to the embodiment of the present application.
Fig. 4 is a construction diagram of an embodiment of the present application.
Fig. 5 is a schematic structural view of a drill assembly according to an embodiment of the present application.
Description of reference numerals: 1. a tube hole; 2. a horizontal directional drilling machine; 31. drilling a rod; 41. guiding to a drilling point; 42. guiding out a drilling point; 5. "Cat back"; 61. back dragging the pipe; 62. the first section returns to the dragging pipe; 7. a barrel rock reamer; 8. a drill assembly; 81. back dragging the rotary joint; 82. a fixing ring; 83. and (6) dragging the head back.
Detailed Description
The present application is described in further detail below with reference to figures 1-5.
The embodiment of the application discloses a site-limited long-distance large-aperture horizontal directional drilling pipeline back-dragging construction process. Referring to fig. 1, the site-limited long-distance large-aperture horizontal directional drilling pipeline back-dragging construction process comprises the following steps:
s1, hole cleaning treatment: the operator first places a drill bit on the ground leading to the side of the drill point 42 and then installs the horizontal directional drilling machine 2 on the ground leading to the side of the drill point 41. The horizontal directional drilling machine 2 is detachably connected with a plurality of drill rods 31 which are connected in sequence, the drill rod 31 closest to one end of the guide drilling point 42 is a first drill rod 31, one end, far away from the horizontal directional drilling machine 2, of the first drill rod 31 is fixedly connected with a cone, and the other end of the cone is fixedly connected with a barrel type rock reamer 7.
An operator firstly rotates and connects the first drill rod 31 on the horizontal directional drilling machine 2, a drill bit is installed at the other end of the first drill rod 31, then the drill bit is placed into the pipe hole 1 through the guide drill-in point 41, and then the drill rods 31 are added between the horizontal directional drilling machine 2 and the first drill rod 31 one by one, so that the drill bit is pushed to move towards the direction close to the guide drill-out point 42; after the drill bit moves to the leading-out drilling point 42, the drill bit is detached from the first drill rod 31, one end of the first drill rod 31 is fixedly connected with the cone, the other end of the cone is fixedly connected with the barrel-type rock reamer 7, and then the drill rods 31 are reduced one by one between the horizontal directional drilling machine 2 and the first drill rod 31, so that the cone and the barrel-type rock reamer 7 are driven to move towards the direction close to the leading-in drilling point 41, and the pipe hole 1 is cleaned.
And then performing a second hole cleaning operation, wherein the steps of the second hole cleaning operation are substantially the same as the steps of the first hole cleaning operation, and the difference is that: the diameter of the roller cone used in the second hole cleaning operation is larger than that of the roller cone used in the first hole cleaning operation. If the drill pipe is stuck, the drill pipe 31 is withdrawn in time, large stones in the pipe hole 1 are cleaned after the drill pipe 31 is withdrawn, and the soil condition in the pipe hole 1 is analyzed. And repeating the operation, wherein the diameter of the roller cone used in the subsequent hole cleaning operation is the same as that of the roller cone used in the second hole cleaning operation until no drilling sticking phenomenon occurs, and thus, the condition of trial back-dragging is provided.
S2, trial back dragging operation: an operator firstly places a trial towing pipe on the ground on one side of the guide drilling point 42, then rotatably connects one end of the first drill rod 31 with the trial towing pipe through the drill assembly 8, the drill assembly 8 comprises a trial towing rotary joint 81 installed at one end of the drill rod 31, the other end of the trial towing rotary joint 81 is fixedly connected with a fixing ring 82, the other end of the fixing ring 82 is fixedly connected with a trial towing head 83, and the other end of the trial towing head 83 is rotatably connected with the front end of the trial towing pipe.
Then the horizontal directional drilling machine 2 drives the trial-return dragging pipe to move from the guide drilling point 42 to the direction close to the guide drilling point 41 along the pipe hole 1; after the operator takes the trial dragging pipe out of the guide drilling point 41, the abrasion degree of the glass fiber reinforced plastics solidified on the outer side wall of the trial dragging pipe is detected, when the abrasion degree of the glass fiber reinforced plastics on the outer side wall of the trial dragging pipe is larger than a set parameter index, hole cleaning treatment needs to be carried out again, and then trial dragging operation is carried out again.
And if the abrasion degree of the glass fiber reinforced plastics of the trial back dragging pipe still exceeds the set parameter index after the second trial back dragging operation is finished, stopping the trial back dragging operation and inserting a protective sleeve into the pipe hole 1. The protective sleeve is of a steel pipe structure, the diameter of the protective sleeve is larger than that of the back dragging pipe 61, the protective sleeve is of a steel pipe structure, and the protective sleeve is dragged back into the pipe hole 1 in a welding and back dragging mode one by one.
Referring to fig. 2, S3, the preparation of the back dragging job specifically includes the following preparation operations:
(1) And the back dragging pipe 61 are arranged and paired: carrying out the back-dragging pipe 61 group fitting test for multiple times on site, and determining the back-dragging operation mode of the back-dragging pipe 61, wherein in engineering, a mode of '6-to-1' or '9-to-1' is generally adopted;
(2) Construction of an anticorrosive coating and a protective layer of the back dragging pipe 61: the pipe bodies and the welded junctions of all the back dragging pipes 61 for trial back dragging operation and formal back dragging operation are all protected by a 3PE reinforced anticorrosive layer and a glass fiber reinforced plastic protective layer, and the glass fiber reinforced plastic protective layer is coated on the outer side of the anticorrosive layer; after the two back dragging pipes 61 are welded, shooting detection is carried out on the welding port after at least 24 hours of interval, whether the welding line is complete or not is detected, anti-corrosion work is carried out after the detection is qualified, and back dragging operation of the next section of back dragging pipe 61 is carried out after the anti-corrosion work is finished and the interval is 3-4 days;
(3) Adding the weight of the back dragging pipe 61 to reduce the back dragging force: in the back dragging process, the back dragging force is mainly influenced by the friction force generated by the back dragging pipe 61 due to buoyancy and the upper hole wall of the pipe hole 1 and the friction force generated by the back dragging pipe 61 and the slurry in the moving process of the pipe hole 1; in order to reduce the influence of the buoyancy between the back dragging pipe 61 and the frictional resistance between the upper hole wall on the back dragging of the back dragging pipe 61, a method of injecting water into the back dragging pipe 61 is adopted in the construction process, and the balance weight of the back dragging pipe 61 is increased;
(4) And hoisting the back dragging pipe 61: the hoisting operation is carried out by a professional hoisting unit, a hoisting scheme is issued, expert demonstration is carried out, and the tonnage and the arrangement position of the crane are checked; in the back dragging process, a crane is matched with an excavator to ensure that the back dragging pipe 61 is always on the soil pile, and the soil pile is timely adjusted after deviation is found; before formal hoisting, trial hoisting operation is carried out on the back dragging pipe 61, the sling is forbidden to be placed at a welded junction connected with the back dragging pipe 61, the hoisting height and the swing arm angle of the all-line crane are ensured to be uniform in the trial hoisting process, and the trial hoisting height is determined according to a construction site; judging the stress condition of the crane according to the height of the towing-back pipe 61 from the ground and the elastic deformation of the towing-back pipe 61, and keeping the towing-back pipe 61 in a horizontal state to ensure that the crane is uniformly stressed;
(5) Selection and inspection of the drill rod 31 and the drill bit: an operator determines the connection mode of the drill rod 31 and the drill bit according to the condition of the back dragging operation, and sends a specially-assigned person to check the drill rod 31 and the drill bit one by one before use, and checks whether cracks exist in the screw thread type, the screw thread abrasion and the drill rod 31 and the drill bit;
(6) Slurry preparation and water storage: cleaning a mud pit in advance before construction, inserting a communicating pipe into the mud pit, inserting the other end of the communicating pipe into the guide drilling point 41, installing a mud pump into the mud pit, communicating the mud pump with a mud pipe, and inserting the other end of the mud pipe into the guide drilling point 42; in the trial back-dragging or formal back-dragging process, the mud in the pipe hole 1 is easy to overflow due to the movement of the drill rod 31, the drill tool assembly 8, the trial back-dragging pipe and the back-dragging pipe 61, so that the mud in the pipe hole 1 is gradually reduced, the arrangement of the communicating pipe is convenient for transferring the mud overflowing from the pipe hole 1 into a mud pool, and then the mud in the mud pool is timely led into the pipe hole 1 through a mud pump and a mud pipe in the gap between the pairing, welding and corrosion prevention construction of the two sections of back-dragging pipes 61, so that the cyclic utilization of the mud is realized; a temporary water tank is arranged on the ground on one side of the guide drilling point 42, a water injection pump is installed in the temporary water tank, and the water injection pump is communicated with a water injection pipe which is conveniently inserted into the pipe cavity of the back dragging pipe 61, so that water can be conveniently injected into the back dragging pipe 61, and the balance weight of the back dragging pipe 61 is increased;
s4, dragging the first section of dragging-back pipe 62 back: referring to fig. 4 and 5, when the first section of the back dragging pipe 62 needs to be pulled back, the operator firstly supplements the drill rods 31 one by one on the horizontal directional drilling machine 2 until the drill bit on the first drill rod 31 moves to the guiding drilling point 42, then detaches the drill bit from the first drill rod 31, replaces the drill bit with the barrel type rock reamer 7, then fixedly connects the back dragging rotary joint 81 to the other end of the barrel type rock reamer 7, fixedly connects the other end of the back dragging rotary joint 81 to the fixing ring 82, fixedly connects the other end of the fixing ring 82 to the back dragging head 83, rotatably connects the other end of the back dragging head 83 to the front end of the first section of the back dragging pipe 62, and sequentially welds and fixes the subsequent back dragging pipe 61 along the length direction of the first section of the back dragging pipe 62.
Then hoisting the first section of the back dragging pipe 62 to a cat back 5 which is arranged at the guide drilling point 42 in advance by using a crane, wherein the cat back 5 is a mound with a slope surface, and the slope bottom of the slope surface is connected with the guide drilling point 42 of the pipe hole 1 and has the same gradient; and then fixedly connecting the end part of the drill rod 31 with the front end of the first section of back dragging pipe 62, starting the horizontal directional drilling machine 2, starting back dragging operation of the first section of back dragging pipe 62, starting a water injection pump while back dragging operation, performing dynamic water injection operation into the pipe cavity of the first section of back dragging pipe 62 through the water injection pipe connected with the water injection pump to increase the balance weight of the first section of back dragging pipe 62, and stopping back dragging operation until the distance between the tail end of the first section of back dragging pipe 62 and the guide-out drilling point 42 is 40-44 meters, wherein the length of the back dragging operation is preferably 42 meters, and simultaneously stopping water injection and withdrawing the water injection pipe.
The original cat back 5 is detached before the first section of the back dragging pipe 62 and the second section of the back dragging pipe are welded and fixed, the second section of the back dragging pipe is hoisted and supported by a crane, and after the anticorrosion and glass fiber reinforced plastic curing construction operation on the welding port of the back dragging pipe 61 and the pipe body is completed, the cat back 5 for supporting the second section of the back dragging pipe in a hoisting state is manufactured.
Referring to fig. 3, S5, the second section of back dragging pipe back dragging:
(1) Welding, detecting and corrosion preventing operation: after the back-dragging operation of the first section of back-dragging pipe 62 is finished, the second section of back-dragging pipe is hoisted and is overlapped with the axis of the first section of back-dragging pipe 62, the first section of back-dragging pipe 62 and the second section of back-dragging pipe are welded and fixed, and the welding joint and the pipe body are subjected to corrosion prevention and glass fiber reinforced plastic curing treatment;
(2) And water injection back dragging: after the welding, the detection and the corrosion prevention operation are completely finished, inserting one end of a water injection pipe into a pipe cavity of a second section of back-dragging pipe, then starting a horizontal directional drilling machine 2 and starting back-dragging operation of the second section of back-dragging pipe, starting a water injection pump during the back-dragging operation, performing dynamic water injection operation into the pipe cavity of the second section of back-dragging pipe through the water injection pipe connected with the water injection pump to increase the balance weight of the second section of back-dragging pipe, stopping the back-dragging operation until the distance between the tail end of the second section of back-dragging pipe and a guide drilling point 42 is 40-44 meters, preferably 42 meters in the application, and simultaneously stopping water injection and withdrawing the water injection pipe;
s6, repeating the step S5 until the last section of back dragging pipe drags back to the pipe hole 1;
s7, after the back dragging is finished, carrying out quality inspection on the back dragging pipe 61: after the last section of the return pipe is pulled back, the corrosion protection layer and the corrosion protection layer of the first section of the return pipe 62 with the front end exposed and guided to the drilling point 41 are inspected. The conductivity of the anticorrosive coating is tested by a feed method, and the nominal conductivity lambda of the anticorrosive coating is not more than 200 mu S/m 2 。
Finally, after the back dragging operation of the back dragging pipe 61 is finished, the ball passing operation is carried out from the direction of the guide drilling-in point 41 to the direction of the guide drilling-out point 42 until the accumulated water in the back dragging pipe 61 is drained; then the inner wall of the back dragging pipe 61 is cleaned at least twice by using a high-sealing straight plate pig until sundries are not discharged at the pipe opening of the back dragging pipe 61 any more.
The implementation principle of the site-limited long-distance large-aperture horizontal directional drilling pipeline back-dragging construction process is as follows:
the step S1 is firstly carried out, in the step S1, the horizontal directional drilling machine 2 drives the drill bit to move from the guide drilling-out point 42 to the guide drilling-in point 41 in the pipe hole 1, so that sundry stones in the pipe hole 1 can be taken out, the inner wall of the pipe hole 1 is smooth, and the probability that the sundry stones scratch the return dragging pipe 61 when the subsequent return dragging pipe 61 moves in the pipe hole 1 is reduced;
then, step S2 is performed, and in step S2, the trial back-dragging operation is convenient for simulating the moving process of the back-dragging pipe 61 in the pipe hole 1 in advance, so as to conveniently judge whether the pipe hole 1 has the condition for back-dragging the back-dragging pipe 61;
subsequently, step S3 is performed, in step S3, the preparation work for the pull-back work is performed to prepare for trial pull-back work or official pull-back work, thereby facilitating the pull-back work for the subsequent pull-back pipe 61;
then S4, firstly arranging a cat back 5 on the ground on one side of the guide outlet drill hole in the S4, hoisting the first section of back dragging pipe 62 on the cat back 5 through a crane, then performing water injection back dragging on the first section of back dragging pipe 62, stopping back dragging operation when the first section of back dragging pipe 62 is dragged into the pipe hole 1 and the distance between the tail end of the first section of back dragging pipe 62 and the guide outlet drill point 42 is 40-44 meters, stopping water injection and withdrawing the water injection pipe, and conveniently guiding back dragging operation of the first section of back dragging pipe 62 by arranging the cat back 5, so that the rigid friction between the first section of back dragging pipe 62 and the guide outlet drill point 42 is reduced;
step S5 is carried out, in the step S5, the front end of the second section of the back dragging pipe is welded and fixed with the tail end of the first section of the back dragging pipe 62, and then an anticorrosive layer and a curing layer are arranged on the welding ports of the first section of the back dragging pipe 62 and the second section of the back dragging pipe and the pipe bodies of the first section of the back dragging pipe 62 and the second section of the back dragging pipe;
then, step S6 is performed, and in step S6, step S5 is repeated, so that the plurality of back dragging pipes 61 can be dragged back to the pipe hole 1 one by one;
and finally, S7, in the S7, the anticorrosive layer and the protective layer of the first section of the back-dragging pipe 62 are inspected, so that the soil condition in the pipe hole 1 can be known in time conveniently, and whether the back-dragging scheme is complete or not can be verified conveniently;
in conclusion, the hole cleaning treatment, the trial towing operation and the cat back 5 are carried out on the towing pipe 61, so that the construction difficulty of the towing pipe 61 in the towing construction process is reduced.
The above are preferred embodiments of the present application, and the scope of protection of the present application is not limited thereto, so: equivalent changes in structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (10)
1. A site-limited long-distance large-aperture horizontal directional drilling pipeline back-dragging construction process is characterized in that: the method comprises the following steps:
s1, hole cleaning treatment: an operator firstly places a drill bit on the ground on one side of the guide drilling point (42), when one end of the drill rod (31) moves to the guide drilling point (42), one end of the drill rod (31) is fixedly connected with the drill bit, and then the drill bit is driven by the horizontal directional drilling machine (2) to move from the guide drilling point (42) to the direction close to the guide drilling point (41) along the pipe hole (1), so that the pipe hole (1) is cleaned; repeating the above operations until no sticking occurs, so as to prepare a back dragging test condition;
s2, trial back-dragging operation: an operator firstly places a trial return dragging pipe on the ground on one side of the guide drilling point (42), then rotatably connects one end of the drill rod (31) with the trial return dragging pipe through a drill tool assembly (8), and then drives the trial return dragging pipe to move from the guide drilling point (42) to the direction close to the guide drilling point (41) along the pipe hole (1) through the horizontal directional drilling machine (2); when an operator takes the trial return dragging pipe out of the guide drilling point (41), detecting the abrasion degree of the glass fiber reinforced plastic solidified on the outer side wall of the trial return dragging pipe, and judging whether hole cleaning treatment needs to be carried out again;
s3, back dragging operation preparation, which specifically comprises the following preparation work:
(1) And the back dragging pipe (61) is arranged and paired: carrying out assembly tests on the back-dragging pipe (61) for multiple times on site, and determining the back-dragging operation mode of the back-dragging pipe (61);
(2) And constructing an anticorrosive layer and a protective layer of the back dragging pipe (61): the pipe bodies and the welded junctions of all the back dragging pipes (61) for trial back dragging operation and formal back dragging operation are all protected by a 3PE reinforced anticorrosive layer and a glass fiber reinforced plastic protective layer, and the glass fiber reinforced plastic protective layer is coated on the outer side of the anticorrosive layer;
(3) And adding a counterweight of the towing back pipe (61) to reduce the towing back force: in the back dragging process, the back dragging force is mainly influenced by the friction force generated by the back dragging pipe (61) and the upper hole wall of the pipe hole (1) due to buoyancy and the friction force generated by the back dragging pipe (61) and slurry in the moving process of the back dragging pipe (1); in order to reduce the influence of the buoyancy between the back dragging pipe (61) and the frictional resistance between the upper hole wall and the back dragging pipe (61) on the back dragging of the back dragging pipe (61), a method of injecting water into the back dragging pipe (61) is adopted in the construction process, and the balance weight of the back dragging pipe (61) is increased;
(4) Hoisting the back dragging pipe (61): the hoisting operation is carried out by a professional hoisting unit, a hoisting scheme is issued, expert demonstration is carried out, and the tonnage and the arrangement position of the crane are checked; in the back dragging process, a crane is matched with an excavator to ensure that a back dragging pipe (61) is always on a soil pile, and the back dragging pipe is adjusted in time after the soil pile is found to be deviated; before formal hoisting, trial hoisting operation is carried out on the back-dragging pipe (61), the sling is forbidden to be placed at a welding port connected with the back-dragging pipe (61), the hoisting height and the swing arm angle of the whole-line crane are uniform in the trial hoisting process, and the trial hoisting height is determined according to a construction site; judging the stress condition of the crane according to the height of the back dragging pipe (61) lifted from the ground and the elastic deformation of the back dragging pipe (61), and keeping the back dragging pipe (61) in a horizontal state to ensure that the crane is uniformly stressed;
(5) Selection and inspection of the drill rod (31) and the drill bit: an operator determines the connection mode of the drill rod (31) and the drill bit according to the condition of trial back-dragging operation, and sends a specially-assigned person to check the drill rod (31) and the drill bit one by one before use, and checks whether the screw thread type, the screw thread abrasion and the drill rod (31) and the drill bit have cracks or not;
(6) Slurry preparation and water storage: a mud pool is cleaned in advance before construction, a communicating pipe is inserted in the mud pool, the other end of the communicating pipe is inserted in a guide drilling point (41), a mud pump is further installed in the mud pool, the mud pump is communicated with a mud pipe, and the other end of the mud pipe is inserted in a guide drilling point (42); a temporary water tank is arranged on the ground on one side of the guide drilling point (42), a water injection pump is arranged in the temporary water tank, and the water injection pump is communicated with a water injection pipe which is convenient to insert into a pipe cavity of the back dragging pipe (61);
s4, dragging the first section of dragging pipe (62) back: hoisting the first section of the back dragging pipe (62) to a cat back (5) which is arranged at the guide drilling point (42) in advance by using a crane, wherein the cat back (5) is a mound with a slope surface, and the slope bottom of the slope surface is connected with the guide drilling point (42) of the pipe hole (1) and has the same gradient; fixedly connecting the end part of the drill rod (31) with a barrel type rock reamer (7), then fixedly connecting the barrel type rock reamer (7) with the front end of the first section of the back dragging pipe (62) through a drilling tool assembly (8), starting the horizontal directional drilling machine (2) and starting the back dragging operation of the first section of the back dragging pipe (62), starting a water injection pump during the back dragging operation, carrying out dynamic water injection operation into the pipe cavity of the first section of the back dragging pipe (62) through the water injection pipe connected with the water injection pump so as to increase the balance weight of the first section of the back dragging pipe (62), stopping the back dragging operation until the distance between the tail end of the first section of the back dragging pipe (62) and the position which is 40-44 meters away from the guide drilling point (42), and simultaneously stopping water injection and withdrawing the water injection pipe;
s5, dragging the second section of dragging pipe back:
(1) Welding, detecting and corrosion preventing operation: after the back-dragging operation of the first section of back-dragging pipe (62) is finished, hoisting the second section of back-dragging pipe and coinciding with the axis of the first section of back-dragging pipe (62), welding and fixing the first section of back-dragging pipe (62) and the second section of back-dragging pipe, and carrying out anticorrosion and glass fiber reinforced plastic curing treatment on a welding interface and a pipe body;
(2) And water injection back dragging: after the welding, the detection and the anticorrosion operation are completely finished, inserting one end of the water injection pipe into a pipe cavity of a second section of the back-dragging pipe, then starting the horizontal directional drilling machine (2) and starting the back-dragging operation of the second section of the back-dragging pipe, starting the water injection pump during the back-dragging operation, performing dynamic water injection operation into the pipe cavity of the second section of the back-dragging pipe through the water injection pipe connected with the water injection pump to increase the balance weight of the second section of the back-dragging pipe, stopping the back-dragging operation until the tail end of the second section of the back-dragging pipe is 40-44 meters away from a guide drilling point (42), and stopping water injection and withdrawing the water injection pipe;
s6, repeating the step S5 until the last section of back dragging pipe drags back to the pipe hole (1);
s7, after the back dragging is finished, the quality of the back dragging pipe (61) is checked: and after the last section of back dragging pipe finishes back dragging, the anticorrosive layer and the protective layer of the first section of back dragging pipe (62) with the front end leaking and guiding to the drilling point (41) are inspected.
2. The site-limited long-distance large-aperture horizontal directional drilling pipeline back-dragging construction process according to claim 1, characterized in that: and in the step S2, if the abrasion degree of the glass fiber reinforced plastics of the trial towing pipe exceeds the set parameter index after the second trial towing back operation is finished, the trial towing back operation is stopped, and the protective sleeve is inserted into the pipe hole (1).
3. The site-limited long-distance large-aperture horizontal directional drilling pipeline back-dragging construction process according to claim 1, characterized in that: in the step S3, after the two back dragging pipes (61) are welded, shooting detection is carried out on the welding port after at least 24 hours of interval, whether the welding line is complete or not is detected, anticorrosion work is carried out after the welding line is qualified, and back dragging work of the next back dragging pipe (61) is carried out after the anticorrosion work is finished and the interval is 3-4 days.
4. The site-limited long-distance large-aperture horizontal directional drilling pipeline back-dragging construction process according to claim 1, characterized in that: in the step S1, a drill rod (31) is detachably connected to the horizontal directional drilling machine (2), a cone is fixedly connected to the other end of the drill rod (31), and a barrel type rock reamer (7) is fixedly connected to the other end of the cone; the diameter of the roller cone used in the second hole cleaning operation is larger than that of the roller cone used in the first hole cleaning operation.
5. The site-limited long-distance large-aperture horizontal directional drilling pipeline back-dragging construction process according to claim 1, characterized in that: drilling tool subassembly (8) are including installing in returning of drilling rod (31) one end and dragging swivel (81), and the other end rigid coupling that returns to dragging swivel (81) has solid fixed ring (82), and the other end rigid coupling of solid fixed ring (82) has to return and drags head (83), and the other end that returns to drag head (83) rotates to be connected in trying back the front end of dragging the pipe or rotate to be connected in the front end that the first section returned and drags pipe (62).
6. The site-limited long-distance large-aperture horizontal directional drilling pipeline back-dragging construction process according to claim 1, characterized in that: in the step S1, if the drill pipe is stuck, the drill pipe (31) is withdrawn in time, large stones in the pipe hole (1) are cleaned after the drill pipe (31) is withdrawn, and the soil condition in the pipe hole (1) is analyzed.
7. The site-limited long-distance large-aperture horizontal directional drilling pipeline back-dragging construction process according to claim 1, characterized in that: and in the step S3, the original cat back (5) is removed before the first section of the back dragging pipe (62) and the second section of the back dragging pipe are welded and fixed, a crane is used for hoisting and supporting the second section of the back dragging pipe, and after the anti-corrosion and glass fiber reinforced plastic curing construction operation of the welding port and the pipe body of the back dragging pipe (61) is completed, the cat back (5) used for supporting the second section of the back dragging pipe in a hoisting state is manufactured.
8. The site-limited long-distance large-aperture horizontal directional drilling pipeline back-dragging construction process according to claim 1, characterized in that: and in the step S3, slurry is supplemented into the pipe hole (1) through a slurry pump in a gap between the two sections of back dragging pipes (61) in assembly, welding and corrosion prevention construction.
9. The site-limited long-distance large-aperture horizontal directional drilling pipeline back-dragging construction process according to claim 1, characterized in that: in the step S7, the conductivity of the anticorrosive coating is tested by adopting a feed method, and the nominal conductivity lambda of the anticorrosive coating is not more than 200 mu S/m 2 。
10. The site-limited long-distance large-aperture horizontal directional drilling pipeline back-dragging construction process according to claim 1, characterized in that: in the step S7, after the back dragging operation of the back dragging pipe (61) is finished, the ball passing operation is carried out from the direction of the guide drilling point (41) to the direction of the guide drilling point (42) until accumulated water in the back dragging pipe (61) is drained; then, cleaning the inner wall of the back dragging pipe (61) at least twice by using a high-sealing straight plate pig until sundries are not discharged at the pipe orifice of the back dragging pipe (61).
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| CN113883331A (en) * | 2021-10-29 | 2022-01-04 | 中石化石油工程技术服务有限公司 | Continuous directional drilling construction method for crossing mudflat, wetland and water network zone |
| CN114992385A (en) * | 2022-05-30 | 2022-09-02 | 中建一局集团建设发展有限公司 | Construction method for connecting large-diameter long-distance steel water delivery pipeline by multiple joints and dragging |
| CN115288609B (en) * | 2022-07-28 | 2023-11-14 | 河南盛邦环境工程有限公司 | Construction method for horizontal well of landfill pile body and perforated pipe connecting device |
| CN116677320B (en) * | 2023-07-04 | 2023-12-12 | 浙江省电力建设有限公司 | Pipeline laying method for crossing grade highway |
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| CN108412424A (en) * | 2018-03-30 | 2018-08-17 | 中国水利水电第六工程局有限公司 | A kind of Directional Drilling returns the tooling and its application method dragged and prevent drilling rod from springing back in construction |
| CN212900088U (en) * | 2020-06-11 | 2021-04-06 | 中石化南京工程有限公司 | Directional crossing back-dragging auxiliary device for cluster pipeline |
| CN212428631U (en) * | 2020-06-29 | 2021-01-29 | 新地能源工程技术有限公司 | Flexible connection pipe dragging device of horizontal directional drill |
| CN112035975A (en) * | 2020-08-28 | 2020-12-04 | 中国石油天然气集团有限公司 | Oil and gas pipeline directional drilling back-dragging design method |
| CN213683980U (en) * | 2020-09-08 | 2021-07-13 | 中石化石油工程技术服务有限公司 | Novel directional drilling double-pipe reducing same-hole back-dragging head |
| CN112901079A (en) * | 2021-02-02 | 2021-06-04 | 陕西中科非开挖技术股份有限公司 | Pipeline returns to dragging is connected and is used protection device |
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