CN113914773A - Large-diameter steel pipe directional drilling opposite-penetrating drilling dragging method installation construction method - Google Patents
Large-diameter steel pipe directional drilling opposite-penetrating drilling dragging method installation construction method Download PDFInfo
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- 238000010276 construction Methods 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 47
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 16
- 239000010959 steel Substances 0.000 title claims abstract description 16
- 238000009434 installation Methods 0.000 title claims abstract description 15
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- 239000004576 sand Substances 0.000 claims abstract description 19
- 238000002156 mixing Methods 0.000 claims abstract description 10
- 239000000440 bentonite Substances 0.000 claims abstract description 6
- 229910000278 bentonite Inorganic materials 0.000 claims abstract description 6
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims abstract description 6
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- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 6
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/02—Determining slope or direction
- E21B47/022—Determining slope or direction of the borehole, e.g. using geomagnetism
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/09—Locating or determining the position of objects in boreholes or wells, e.g. the position of an extending arm; Identifying the free or blocked portions of pipes
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/28—Enlarging drilled holes, e.g. by counterboring
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Abstract
The invention discloses a dragging method for installing and constructing a large-diameter steel pipe by directional drilling and opposite-penetrating drilling, which relates to the field of drilling construction, the artificial magnetic field is generated by laying a cable and is used as a bottom surface beacon, an axial magnet is installed in a bit short circuit to guide a drill bit of a main drilling machine to drill, directional drilling is realized, drilling deviation caused by the drill bit deviation is avoided, the drilling efficiency is influenced, the drilling dragging method installation construction is performed by the directional drilling opposite-penetrating drilling of the medium-coarse sand layer ultra-long distance large-diameter steel pipe, a CMC system is adopted for preparing slurry, small-circulation slurry distribution is performed by a feeding hopper, a hydration tank and a slurry distribution tank according to a slurry formula, the slurry is guided into a slurry storage tank after circulation stirring, three sets of slurry mixing and feeding systems are arranged, the length of a circulation pipeline is increased, the curing and mixing time of bentonite and additives is prolonged, slurry suitable for drilling working conditions is provided for a drilling machine system, and the artificial magnetic field is suitable for medium-coarse sand layer geology.
Description
Technical Field
The invention relates to the field of drilling construction, in particular to a dragging method for installing a large-diameter steel pipe directional drill through drilling.
Background
The rotary drilling rig is used as a relatively advanced construction machine in bored pile construction, and shows obvious superiority in the field of bored pile construction. Compared with a common punching pile machine, the rotary drilling rig has the advantages of high hole forming speed, wide stratum application range, convenience and accuracy in pile alignment, small environmental pollution and good construction effect.
The application document with the authorization notice number of CN109723373B discloses a pore-forming construction process of a slightly weathered granite stratum rotary drilling bored concrete pile, which is characterized by comprising the following steps of: step S1: clearing sundries in a site within the designed pile position range, leveling a construction site, and ensuring that a base site of the rotary drilling rig is leveled and tamped; step S2: according to a design drawing, performing field measurement and lofting to determine a pile position center; step S3: embedding a protective cylinder; step S4: drilling a hole by using a drilling pile; step S5: hoisting a reinforcement cage; step S6: lowering the conduit; step S7: and pouring underwater concrete. According to the invention, the roller cone type core drill bit is adopted to carry out the construction of the slightly weathered rock stratum drilling pile, so that the problem that the construction of a rotary drilling rig on a slightly weathered rock stratum is difficult is solved, and the aim of quick construction of the slightly weathered rock stratum is fulfilled; the rotary drilling rig can quickly form holes in a complex stratum by adopting various rotary drilling bits to be mixed and matched for use, so that the hole forming efficiency is greatly accelerated.
However, in the long-distance drilling of the medium and coarse sand layer, a bidirectional drilling mode is usually adopted for improving the drilling efficiency, but because the drilling direction of the drilling machine in the drilling process has uncertainty, the drilling difference is easy to occur, and the two channels are mutually deviated.
Disclosure of Invention
The invention aims to provide a mounting construction method for a large-diameter steel pipe directional drill through drilling and dragging method, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
the installation and construction method of the large-diameter steel pipe directional drill through drilling and dragging method comprises the following steps:
s1, construction preparation, which comprises the steps of compiling a through drilling construction scheme, organizing constructors to be familiar with construction drawings, reviewing drawings, compiling welding operation rules and operation instruction books, preparing materials, preparing constructors, preparing machines and equipment and preparing construction sites;
s2, measuring and setting out, wherein before measurement, a floor layout of a construction site is compiled according to design, a crossing center line is played by using a measuring instrument, a crossing soil-in point and a soil-out point are determined, and boundary lines of a drilling machine installation site, a mud pit and a prefabricated site crossing a pipe section are determined;
s3, adjusting a direction control system, and performing accurate direction control by adopting ParatrackII direction control software and a ground beacon system;
s4, drilling a guide hole, wherein the guide hole drilling rod selection is included, a proper drill bit and an underground slurry motor are selected according to geological conditions, when the drill rod drills into a relatively stable sand layer, a support sleeve is drilled into the drill rod, the sleeve enters the relatively stable sand layer through a silt layer, a sand gravel layer and the like, a slurry pump is started to aim at an earth entering point for drilling, the drill bit is driven by the drilling machine to rotate under the thrust action of the drilling machine to cut the ground layer and continuously advance, the actual position of the drill bit is accurately measured according to data fed back by a probe in a non-magnetic drill collar after each drill rod is drilled, for the position deviation of the drill bit, the drill rod is drilled to enable a short joint of the slurry motor to push different directions, the drilling direction of the drill bit is adjusted, and the curve deviation of the finished guide hole is ensured to be not more than 1%;
the method comprises the following steps that guide holes are butted, cables are laid on the ground surface along a center line of a crossing curve manually, an artificial magnetic field for controlling direction can be generated by electrifying the cables, the direction control of drill bits is guided when the drill bits pass through a river deep water section, the drill bits of two drilling machines drill to a preset butt joint point, when the two drilling machines reach a specified position, a probe of an earth point drilling machine senses a magnetic signal sent by a target magnet arranged in a short section of the drill bit of the earth point drilling machine, the two drilling machines operate in a coordinated mode, the earth point drilling machine drills, and the earth point drilling machine pumps back a drill rod until the guide holes of the two drilling machines are completely matched;
s5, reaming and cleaning holes, after the pilot holes are finished, removing the drill bit and the detection rod, installing a corresponding reamer, starting reaming after determining that the reamer and the slurry spray holes are not blocked, and cleaning the holes when the reaming is not smooth;
s6, dragging the pipeline backwards, dragging the pipeline drilling tool backwards: the drilling machine, a drill rod, a reamer, a universal joint, a U-shaped ring, a puller head and a passing pipe section;
preferably, drilling a guide hole, reaming, cleaning a hole and pulling a pipeline back all need slurry, the slurry is prepared by adopting a CMC system, small-cycle slurry preparation is carried out by a feeding hopper, a hydration tank and a slurry preparation tank according to a slurry formula, the slurry is led into a slurry storage tank after being circularly stirred, three sets of slurry mixing and feeding systems are arranged, the length of a circulating pipeline is increased, the curing and mixing time of bentonite and an additive is prolonged, and the slurry suitable for the drilling working condition is provided for a drilling machine system.
Preferably, the pH value of the water for proportioning the slurry is 9-10, and the unqualified water is pretreated by using sodium carbonate.
Preferably, the pipe welding step is as follows:
the welding method adopts the cellulose type welding rod root welding and the self-shielded flux-cored wire semi-automatic filling welding and capping;
the welding direction is downward welding, the number of welding workers of each layer of welding bead is 2, and necessary protective measures are needed to prevent welding spatters from hurting people during welding;
the time interval between root welding and filling welding is not more than 10min, the interlayer temperature is controlled to be 50-150 ℃, and the repair interlayer temperature is 100-200 ℃;
when the pipeline is welded, effective measures are taken to prevent ventilation in the pipeline;
during on-site welding, related joint design, the number of welding layers, welding process parameters and post-welding slow cooling are strictly executed according to welding process procedures.
Preferably, the welded pipeline is subjected to a hydraulic test after being subjected to flaw detection and qualified inspection, after the pressure test is qualified, the pipeline is subjected to supervision and certification and recorded, and then water in the pipeline is discharged completely.
Preferably, the guide holes are butted in the guide holes,
laying a cable on the ground along a crossing center line, and connecting the cable with alternating current to generate an alternating current magnetic field;
drilling machines are respectively installed at the two ends of the crossing curve, which enter the soil, the two drilling machines carry out guide hole construction in opposite directions along the preset crossing curve, an artificial alternating current magnetic field generated in the previous step is applied during the guide hole construction, and an alternating current reference magnetic block is combined and used in a deep water area;
the butt joint is selected in a horizontal straight line section passing through a curve, the butt joint distance is 100m, a magnet probe on a drill rod of the soil entry point approaches to a target magnet probe of a rig of the soil exit point, when the butt joint and the target magnet probe are within 5m, the accurate deviation between two guide holes is calculated by a computer according to a magnetic signal acquired by the probes, and the rig of the soil entry point acquires the magnetic signal of an axial magnet of the rig of the soil exit point and controls the drilling direction to reduce the deviation by utilizing the acquired magnetic signal so as to gradually and smoothly approach the formed guide holes of the rig of the soil exit point until the drill bit drills into the guide holes of the rig of the soil exit point to carry out accurate butt joint action;
and (4) retreating the drill rods of the drilling machines at the unearthed points, and following the drill rods at the unearthed points until the crossing curves of the two drilling machines are communicated.
Preferably, when the cable is laid, the alternating current reference magnetic block is placed on the crossing center line in a deep water area where the cable cannot be laid.
Preferably, the excavation of the floating ditch, the swinging pipe, the cushion pipe and the protection along the line of the back dragging pipeline are completed at the same time of reaming.
Compared with the prior art, the invention has the beneficial effects that:
1. an artificial magnetic field is generated by laying a cable and is used as a bottom surface beacon, an axial magnet is arranged in a drill bit short circuit to guide a drill bit of a main drilling machine to drill, directional drilling is realized, and drilling deviation caused by the deviation of the drill bit is avoided, so that the drilling efficiency is not influenced;
2. the method is characterized in that a CMC system is adopted for slurry preparation, small-circulation slurry preparation is carried out by a feeding hopper, a hydration tank and a slurry preparation tank according to a slurry formula, the slurry is led into a slurry storage tank after circulation stirring, three sets of slurry mixing and feeding systems are arranged, the length of a circulation pipeline is increased, the curing and mixing time of bentonite and additives is prolonged, the slurry suitable for drilling working conditions is provided for a drilling machine system, and the method is suitable for medium-coarse sand layer geology.
Drawings
FIG. 1 is a flow chart of the construction process of the present invention.
Detailed Description
Examples
The construction method is that the large-diameter steel pipe is installed by a directional drilling and opposite-penetrating drilling dragging method, the construction geology is a medium-coarse sand layer, and the drilling length is long-distance drilling.
With reference to fig. 1, the construction steps are as follows:
technical preparation
According to the designed pile crossing line position, organizing engineering technicians and measuring personnel to carry out detailed investigation on the site, fully knowing the distribution and the geological structure of the medium and coarse sand layer and compiling a detailed construction scheme for the medium and coarse sand layer to pass through; the organization technical personnel are familiar with mastering engineering construction drawings, technical requirements and construction acceptance standard specifications, the drawings are subjected to reviewing work, the problems in the drawings are solved, and related personnel are organized to make welding operation rules and operation instruction books according to the evaluation of the welding process;
preparing materials: the supply condition of local materials is known, when the materials are needed to be supplied, the materials can be adjusted at any time, the construction main materials are purchased by units with good domestic credit and good quality, and a large amount of consumable materials required by construction, such as angle grinders, grinding wheels, bentonite, signal lines, accessories of various special imported machines and tools, and the like, are purchased and stored in advance to ensure the construction requirement;
preparing constructors, machines and equipment: according to the needs of the crossing engineering, training main work categories such as welders, lifting workers, plumbers, direction control workers, mud workers and the like, learning the safety technical requirements of the engineering, the operation rules, quality standards and operation instruction books to be executed by the work categories, and performing examination to guarantee the post, maintaining the horizontal directional drilling machine to be put into the crossing engineering construction according to the construction arrangement of the engineering and the whole construction plan of a company, and ensuring the normal operation of equipment;
preparation of a construction site: familiarizing the landform and the geomorphic landscape of the site, planning the approach route of the large construction equipment in advance, and making the four-way and one-level on the site.
Measuring line
Before measurement and paying-off, a construction site ground level layout chart is compiled according to control pile positions, equipment conditions, engineering conditions, landforms and the like given by design; and (4) discharging the crossing center line by using a measuring instrument, determining a crossing soil-in point and a soil-out point, and determining a drilling machine installation site, a mud pit and a boundary line crossing a pipe section prefabrication site.
The direction control system adopts Paratrack II direction control software and a ground beacon system to carry out accurate direction control, the direction of the drill bit is guided to correctly drill, the direction control system reasonably guides the drill bit to drill according to a design curve, when the unearthed point drilling machine reaches a butt joint area, an axial magnet arranged in a short section of the drill bit of the unearthed point drilling machine is started, and the drill bit of the unearthed point drilling machine is guided to drill until the unearthed point drilling machine is drilled into a guide hole of the unearthed point drilling machine; the geological data is carefully analyzed before the drill is driven, a direction control scheme is determined, all links of slurry configuration and drill operation are emphasized, all parameters are carefully analyzed, a guide hole meeting requirements is drilled, the hole forming condition is analyzed by the guide hole construction according to the geological data and instrument parameters at any time, the through analysis of a medium-coarse sand layer is well done, the accurate unearthing and good hole forming are achieved.
Drill guide hole
The method comprises the steps of selecting a guide hole drill rod, wherein the distance of a 5 'drill rod for drilling a guide hole can exceed 1300 m under the normal condition, the ratios of the axial inertia moment of the 5-1/2 and 6-5/8 drill rods to the axial inertia moment of the 5' drill rod are 1.328 and 2.454 respectively, 1726.4 m can be reached by adopting the 5-1/2 'drill rod if the influence of the change of the outer diameter of the drill rod on the friction resistance is neglected, 3190.2 m can be reached by adopting the 6-5/8' drill rod, and the main problem in the construction of the guide hole is that the buckling and breaking phenomena of the drill rod often occur under the condition of larger thrust because the strength of the drill rod is limited, so the most suitable drill rod is selected according to the tensile capacity and the torsional capacity of a rod body which can bear by different drill rods and the maximum back-dragging force of a drilling machine;
the surface layer is of a sand gravel and silt stratum structure with a loose structure, when a drill rod drills into a relatively stable sand layer, the drill rod drills into a support sleeve along the drill rod, so that the sleeve enters into the relatively stable sand layer through the silt layer, the sand gravel stratum and the like;
according to the passing geological condition, a proper drill bit and an underground slurry motor are selected, a slurry pump is started to aim at an earth-entering point for drilling, the drill bit is driven by the drilling machine to rotate and cut the stratum under the thrust action of the drilling machine to drive the drill bit to rotate and advance continuously, or the slurry motor is used for cutting the stratum, the actual position of the drill bit is accurately measured according to data fed back by a probe in a non-magnetic drill collar after each drilling of one drill rod, for the deviation of the position of the drill bit, the drill rod is driven to enable a short joint in the direction of the slurry motor to be pushed into different directions, the drilling direction of the drill bit is adjusted, and the deviation of the finished pilot hole curve is ensured to be not more than 1%.
Guide hole joint
The method comprises the steps that butt joint is carried out in the crossing process, accurate direction control is carried out by adopting Paratrack II direction control software and a ground beacon system, cables are laid on the ground surface along the crossing curve central line manually when guide holes are constructed, an artificial magnetic field for direction control can be generated by supplying alternating current to the cables, the direction control of drill bits is guided when the drill bits pass through a river deep water section, the drill bits of two drilling machines drill to preset butt joint points, when the two drilling machines reach specified positions, a probe of an earth-entering point drilling machine induces magnetic signals sent by a target magnet arranged in a short section of the drill bit of an earth-entering point drilling machine, the two drilling machines operate in a coordinated mode, the earth-entering point drilling machine drills, and the earth-exiting point drilling machine pumps a drill rod until the guide holes of the two drilling machines are completely matched;
the butt joint is selected in a horizontal straight line section of a crossing curve, the butt joint distance is 100m, a magnet probe on a drill rod at an earth-entering point approaches a target magnet probe of a drilling machine at an earth-exiting point, when the two are within 5m, the accurate deviation between two guide holes is calculated by a computer according to a magnetic signal acquired by the probes, the drilling machine at the earth-entering point acquires the magnetic signal of an axial magnet of the drilling machine at the earth-exiting point according to the deviation, the acquired magnetic signal is used for controlling the drilling direction to reduce the deviation at the same time, so that the drill rod gradually and smoothly moves towards the formed guide holes of the drilling machine at the earth-exiting point until the drill rod is drilled into the guide holes of the drilling machine at the earth-exiting point, the accurate butt joint action is carried out, the drill rod at the earth-exiting point retreats, the drill rod at the earth-entering point follows until the crossing curves of the two drilling machines are completely combined into one, when the earth-entering point drilling machine and the earth-exiting point drilling machine are in a coordinated and operated at a uniform speed, so that the two drill bits are always in a hand-shaking state, and ensuring that the guide holes are successfully butted, finishing the construction of the guide holes, and performing all-stage pre-reaming construction of the holes by using a drilling machine.
Attention should be paid to the docking of the pilot holes: selecting the butt joint point to be at a horizontal track as much as possible and to be close to the unearthed point end as much as possible; when the pilot hole is in the deflecting section, the drill bit selects a tool face with zero-degree angle for fast pushing; the discharge capacity of the slurry can not exceed 1.3m3Min, reducing the mud amount in the deflecting head-lifting section; during the propelling process, parameters such as thrust, inclination angle, azimuth angle and the like must be observed at any time, compared with the parameters at the same position measured in the previous drilling process, and if the parameters have large changes, the reasons should be analyzed and processed.
Enlarging holes
After the pilot hole is finished, the drill bit and the detection rod are removed, a corresponding reamer is installed, the reamer starts reaming after determining that the reamer and a slurry spray hole are not blocked, the reamer and a drill rod can be reamed only by ensuring that the reamer and the drill rod are connected in place, firmly and reliably, and tripping accidents are prevented from occurring in the non-reaming process; in each stage of reaming construction, the reaming condition is carefully observed, if the problems of unsmooth reaming and the like occur, hole washing is carried out, and hole washing operation is carried out by adopting a barrel type reamer.
Pipeline back-dragging device
Back dragging is the last step of directional crossing and is the most critical step, and the back dragging of the pipeline drilling tool: the drilling machine, a drill rod, a reamer, a universal joint, a U-shaped ring, a dragging head and a crossing pipe section; and (4) finishing the protection work of digging floating ditches, swinging pipes, cushion pipes and lines of the back dragging pipeline while carrying out hole expanding work. The pipe head is placed about 20 meters away from the unearthed point, and for better protection of a pipeline anticorrosive coating, the mode of digging a floating ditch is mostly adopted, and a roller support is adopted for sending to an unearthed plot.
A CMC system is adopted in the slurry preparation, a charging hopper, a hydration tank and a slurry preparation tank are used for small-cycle slurry preparation according to a slurry formula, the slurry is circularly stirred and then is led into a slurry storage tank, three sets of slurry mixing and charging systems are arranged, the length of a circulating pipeline is increased, the curing and mixing time of bentonite and an additive is prolonged, slurry suitable for a drilling working condition is provided for a drilling machine system, medium-coarse sand layer geology is combined, water for preparing the slurry is not suitable for being too hard and not suitable for being acidic, sodium carbonate is applied for pretreatment when the water quality is unqualified, and the PH value reaches 9-10.
Pipeline welding, wherein the welding method adopts a cellulose type welding rod root welding and a self-shielded flux-cored wire semi-automatic filling welding and capping; the welding direction is downward welding, the number of welding workers of each layer of welding bead is 2, and necessary protective measures are needed to prevent welding spatters from hurting people during welding; the time interval between root welding and filling welding is not more than 10min, the interlayer temperature is controlled to be 50-150 ℃, and the repair interlayer temperature is 100-200 ℃; when the pipe is welded, effective measures are taken to prevent ventilation in the pipe; during on-site welding, related joint design, the number of welding layers, welding process parameters and post-welding slow cooling are strictly executed according to welding process procedures;
the method comprises the steps of detecting flaws before welding, performing a hydrostatic test after flaw detection and pressure reduction are qualified, cleaning pipes and performing strength and tightness pressure tests according to design and specifications for pipelines, using a pressure test medium as non-corrosive clean water, using a slurry discharge pit as a reservoir, depositing silt after filling water, filtering floating objects on water by using a wire mesh, and adding a filter screen in front of a pump for water feeding. After the pressure test is qualified, the monitoring and the certification are required and the record is made, and then the water in the pipeline is discharged.
Claims (8)
1. The installation and construction method of the large-diameter steel pipe directional drill through drilling and dragging method is characterized in that: the method comprises the following steps:
s1, construction preparation, which comprises the steps of compiling a through drilling construction scheme, organizing constructors to be familiar with construction drawings, reviewing drawings, compiling welding operation rules and operation instruction books, preparing materials, preparing constructors, preparing machines and equipment and preparing construction sites;
s2, measuring and setting out, wherein before measurement, a floor layout of a construction site is compiled according to design, a crossing center line is played by using a measuring instrument, a crossing soil-in point and a soil-out point are determined, and boundary lines of a drilling machine installation site, a mud pit and a prefabricated site crossing a pipe section are determined;
s3, adjusting a direction control system, and performing accurate direction control by adopting ParatrackII direction control software and a ground beacon system;
s4, drilling a guide hole, wherein the guide hole drilling rod selection is included, a proper drill bit and an underground slurry motor are selected according to geological conditions, when the drill rod drills into a relatively stable sand layer, a support sleeve is drilled into the drill rod, the sleeve enters the relatively stable sand layer through a silt layer, a sand gravel layer and the like, a slurry pump is started to aim at an earth entering point for drilling, the drill bit is driven by the drilling machine to rotate under the thrust action of the drilling machine to cut the ground layer and continuously advance, the actual position of the drill bit is accurately measured according to data fed back by a probe in a non-magnetic drill collar after each drill rod is drilled, for the position deviation of the drill bit, the drill rod is drilled to enable a short joint of the slurry motor to push different directions, the drilling direction of the drill bit is adjusted, and the curve deviation of the finished guide hole is ensured to be not more than 1%;
the method comprises the following steps that guide holes are butted, cables are laid on the ground surface along a center line of a crossing curve manually, an artificial magnetic field for controlling direction can be generated by electrifying the cables, the direction control of drill bits is guided when the drill bits pass through a river deep water section, the drill bits of two drilling machines drill to a preset butt joint point, when the two drilling machines reach a specified position, a probe of an earth point drilling machine senses a magnetic signal sent by a target magnet arranged in a short section of the drill bit of the earth point drilling machine, the two drilling machines operate in a coordinated mode, the earth point drilling machine drills, and the earth point drilling machine pumps back a drill rod until the guide holes of the two drilling machines are completely matched;
s5, reaming and cleaning holes, after the pilot holes are finished, removing the drill bit and the detection rod, installing a corresponding reamer, starting reaming after determining that the reamer and the slurry spray holes are not blocked, and cleaning the holes when the reaming is not smooth;
s6, dragging the pipeline backwards, dragging the pipeline drilling tool backwards: the drilling machine, a drill rod, a reamer, a universal joint, a U-shaped ring, a puller head and a passing pipe section;
2. the installation and construction method of the large-diameter steel pipe by the directional drilling and opposite-penetrating drilling and pulling method according to claim 1, which is characterized in that: the slurry is prepared by adopting a CMC system, small-circulation slurry preparation is carried out by a feeding funnel, a hydration tank and a slurry preparation tank according to a slurry formula, the slurry is led into a slurry storage tank after circulation stirring, three sets of slurry mixing and feeding systems are arranged, the length of a circulation pipeline is increased, the curing and mixing time of bentonite and an additive is prolonged, and the slurry suitable for the drilling working condition is provided for a drilling machine system.
3. The installation and construction method of the large-diameter steel pipe by the directional drilling and opposite-penetrating drilling and pulling method according to claim 2, wherein the method comprises the following steps: the PH value of the water for proportioning the slurry is 9-10, and the unqualified water is pretreated by sodium carbonate.
4. The installation and construction method of the large-diameter steel pipe by the directional drilling and opposite-penetrating drilling and pulling method according to claim 1, which is characterized in that: the pipeline welding steps are as follows:
the welding method adopts the cellulose type welding rod root welding and the self-shielded flux-cored wire semi-automatic filling welding and capping;
the welding direction is downward welding, the number of welding workers of each layer of welding bead is 2, and necessary protective measures are needed to prevent welding spatters from hurting people during welding;
the time interval between root welding and filling welding is not more than 10min, the interlayer temperature is controlled to be 50-150 ℃, and the repair interlayer temperature is 100-200 ℃;
when the pipeline is welded, effective measures are taken to prevent ventilation in the pipeline;
during on-site welding, related joint design, the number of welding layers, welding process parameters and post-welding slow cooling are strictly executed according to welding process procedures.
5. The installation and construction method of the large-diameter steel pipe directional drilling and opposite-penetrating drilling and pulling method according to claim 4, wherein the method comprises the following steps: and (4) performing a hydraulic test on the welded pipeline after the flaw detection is qualified, and after the pressure test is qualified, asking for supervision and certification and making a record, and then draining water in the pipeline.
6. The installation and construction method of the large-diameter steel pipe by the directional drilling and opposite-penetrating drilling and pulling method according to claim 1, which is characterized in that: in the butt joint of the guide holes,
laying a cable on the ground along a crossing center line, and connecting the cable with alternating current to generate an alternating current magnetic field;
drilling machines are respectively installed at the two ends of the crossing curve, which enter the soil, the two drilling machines carry out guide hole construction in opposite directions along the preset crossing curve, an artificial alternating current magnetic field generated in the previous step is applied during the guide hole construction, and an alternating current reference magnetic block is combined and used in a deep water area;
the butt joint is selected in a horizontal straight line section passing through a curve, the butt joint distance is 100m, a magnet probe on a drill rod of the soil entry point approaches to a target magnet probe of a rig of the soil exit point, when the butt joint and the target magnet probe are within 5m, the accurate deviation between two guide holes is calculated by a computer according to a magnetic signal acquired by the probes, and the rig of the soil entry point acquires the magnetic signal of an axial magnet of the rig of the soil exit point and controls the drilling direction to reduce the deviation by utilizing the acquired magnetic signal so as to gradually and smoothly approach the formed guide holes of the rig of the soil exit point until the drill bit drills into the guide holes of the rig of the soil exit point to carry out accurate butt joint action;
and (4) retreating the drill rods of the drilling machines at the unearthed points, and following the drill rods at the unearthed points until the crossing curves of the two drilling machines are communicated.
7. The installation and construction method of the large-diameter steel pipe by the directional drilling and opposite-penetrating drilling and pulling method according to claim 6, wherein the method comprises the following steps: when the cable is laid, the alternating current reference magnetic block is placed on the crossing center line in a deep water area where the cable cannot be laid.
8. The installation and construction method of the large-diameter steel pipe by the directional drilling and opposite-penetrating drilling and pulling method according to claim 1, which is characterized in that: and (3) at the same time of reaming, finishing excavation of the back dragging pipeline, floating ditch, swinging pipe, cushion pipe and protection along the line.
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