CN117328803A - Hole cleaning construction method for large-diameter pipeline pulling - Google Patents
Hole cleaning construction method for large-diameter pipeline pulling Download PDFInfo
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- CN117328803A CN117328803A CN202311472189.XA CN202311472189A CN117328803A CN 117328803 A CN117328803 A CN 117328803A CN 202311472189 A CN202311472189 A CN 202311472189A CN 117328803 A CN117328803 A CN 117328803A
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- 238000010276 construction Methods 0.000 title claims abstract description 64
- 238000004140 cleaning Methods 0.000 title abstract description 11
- 238000005553 drilling Methods 0.000 claims abstract description 77
- 238000005406 washing Methods 0.000 claims abstract description 37
- 238000000034 method Methods 0.000 claims abstract description 31
- 239000002002 slurry Substances 0.000 claims abstract description 21
- 239000011435 rock Substances 0.000 claims abstract description 19
- 238000001125 extrusion Methods 0.000 claims abstract description 15
- 238000003466 welding Methods 0.000 claims abstract description 15
- 238000007599 discharging Methods 0.000 claims abstract description 9
- 238000009434 installation Methods 0.000 claims abstract description 7
- 230000008569 process Effects 0.000 claims description 17
- 239000002689 soil Substances 0.000 claims description 17
- 238000013461 design Methods 0.000 claims description 14
- 239000012634 fragment Substances 0.000 claims description 7
- 238000002360 preparation method Methods 0.000 claims description 7
- 238000004321 preservation Methods 0.000 claims description 5
- 238000012546 transfer Methods 0.000 claims description 4
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- 239000000463 material Substances 0.000 abstract description 4
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- 229910000831 Steel Inorganic materials 0.000 description 2
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- 238000005516 engineering process Methods 0.000 description 2
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- 230000006698 induction Effects 0.000 description 2
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- 230000002787 reinforcement Effects 0.000 description 2
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- 239000010959 steel Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 244000208734 Pisonia aculeata Species 0.000 description 1
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- 230000001050 lubricating effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 210000002445 nipple Anatomy 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
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Classifications
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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
- E21B7/046—Directional drilling horizontal 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
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
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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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- Mining & Mineral Resources (AREA)
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- Environmental & Geological Engineering (AREA)
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- Mechanical Engineering (AREA)
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Abstract
The invention discloses a construction method for hole cleaning of a large-diameter pipeline pulling pipe, which comprises the following construction steps: s1: preparing construction; s2: measuring and paying off; s3: and (3) equipment installation: detachably connecting a plurality of large-diameter extrusion reamers of different types in series; s4: welding and insulating pipelines; s5: slurry configuration; s6: drilling a guide hole, and connecting a directional drilling machine with a drill rod; s7: reaming: connecting the reamer at the tail with a drill rod, and dragging the combined reamer into a guide hole through the drill rod by a directional drilling machine to enlarge the guide hole; s8: washing holes: and starting the directional drilling machine to drive the combined reamer to rotate and drag, discharging the rock scraps and mud strips deposited after reaming, ensuring the smoothness of the whole guide hole, and completing the disassembly of the reamer by dragging. The version method is simple and easy to operate, can be installed at any time when required on site, can be reused, and particularly saves time and materials when in large-diameter pipeline tube drawing construction, improves the hole forming rate of one-time hole washing, ensures that the engineering is completed on time, and saves the cost.
Description
Technical Field
The invention relates to the technical field of municipal engineering, in particular to a large-diameter pipeline pulling and hole washing construction method.
Background
In the construction process of large-diameter pipeline crossing engineering in recent years, the horizontal directional drilling and pipe pulling technology is widely applied in China due to the characteristics of accurate guiding, environmental protection, short construction period, high efficiency and high safety. The large-diameter pipeline pipe pulling construction mainly comprises four steps of drilling a guide hole, reaming, washing the hole and pulling back. Wherein, the hole washing before the back dragging is to control whether the large-diameter pipeline pulling pipe can be successfully dragged back. The purpose of washing the hole is to break up and take out the rock scraps and mud strips which are deposited in the hole after the reaming is finished, so that the resistance of the pipeline during back dragging is reduced. The conventional hole washing mode is to repeatedly drag the drill back in the hole (2-3 times) by using a directional drilling machine so as to achieve the aim of cleaning. However, most of the crossing engineering pipelines are long, the single drill bit has low repeated dragging efficiency and poor effect, and the hole washing quality is difficult to ensure.
Therefore, how to solve the technical problems of low repeated dragging efficiency and poor hole washing quality of a single drill bit and the long pipeline existing in the large-diameter pipeline crossing engineering is urgent to solve at present.
Disclosure of Invention
In view of the above, the invention provides a construction method for pulling a pipe and cleaning a hole of a large-diameter pipe, which combines the back-pulling power of large-diameter pipe construction directional drilling equipment, connects three large-diameter extrusion reamers of different types in series, drives a combined reamer to rotate and back-pull through a drill rod, brings residual rock fragments and mud strips in a guide hole out of the hole, and solves the problem of low back-pulling efficiency of a drill bit in the process of cleaning the hole of the large-diameter pipe.
The invention provides a construction method for pipe pulling and hole cleaning of a large-diameter pipe, which adopts the following technical scheme:
a large-diameter pipeline pulling and hole washing construction method comprises the following construction steps:
s1: and (3) preparation of construction: preparing a directional drilling machine, a drill rod, a plurality of large-diameter extrusion reamers and a pipeline sending ditch;
s2: measuring and paying off;
s3: and (3) equipment installation: discharging a control line and equipment placement positions of the directional drilling machine field according to the design pile and the construction drawing, ensuring that the center line of the directional drilling machine forms a straight line with the soil entering point and the soil exiting point, and detachably connecting a plurality of large-diameter extrusion reamers of different types in series;
s4: welding and heat preservation of pipelines: the pipeline sending ditch is internally provided with pipelines and the pipelines are welded;
s5: slurry configuration;
s6: drilling a guide hole, and connecting a directional drilling machine with a drill rod;
s7: reaming: connecting the reamer at the tail with a drill rod, and dragging the combined reamer into a guide hole through the drill rod by a directional drilling machine to enlarge the guide hole;
s8: washing holes: and starting the directional drilling machine to drive the combined reamer to rotate and drag, discharging the rock scraps and mud strips deposited after reaming, ensuring the smoothness of the whole guide hole, and completing the disassembly of the reamer by dragging.
Optionally, the plurality of large-diameter extrusion-type reamers respectively adopt large-diameter extrusion-type reamers of different models.
Optionally, the three large-diameter extrusion reamers with different types are connected in series, wherein the largest reamer extrudes and drags mud strips and rock fragments in the pipe diameter in advance, and the subsequent reamers carry out the residual mud strips and rock fragments in the same way.
Optionally, the large diameter squeeze reamer includes a maximum size reamer, a medium size reamer, and a minimum size reamer, the maximum size reamer being located in front, the minimum size reamer being located in the middle, and the medium size reamer being located in the end.
Optionally, the maximum size reamer is phi 1950, the minimum size reamer is phi 1650, and the medium size reamer is phi 1800.
Optionally, in S6, the pilot hole is pulled back into the pilot hole by the directional drilling machine, enlarging the pilot hole, and simultaneously pumping a large amount of mud into the borehole.
Optionally, in S7, one end of the reamer is attached to a drill pipe and the other end is attached to a pipe via a transfer case.
Optionally, in S8, the directional drilling machine is started to pull back the reamer, and the directional drilling machine is pulled slowly and rotated quickly.
Optionally, in S8, the back-hauling process is performed continuously with the slurry until the reamer and pipe are broken out from the directional drilling machine side.
Alternatively, the earth outlet point of the guide hole is generally 8-18 degrees, and the earth inlet point of the guide hole is 4-12 degrees.
In summary, the present invention includes at least one of the following beneficial technical effects: the construction method is simple and easy to operate, can be installed at any time when required on site, can be reused, and particularly saves time and materials when the large-diameter pipeline is drawn, improves the hole forming rate of one-time hole washing, ensures that the engineering is completed on time, and saves the cost.
Drawings
FIG. 1 is a schematic view of the connection structure of a dilator according to an embodiment of the present invention;
fig. 2 is a schematic overall structure of an embodiment of the present invention.
Reference numerals illustrate: 1. a maximum size reamer; 2. medium-sized reamers; 3. a minimum model reamer; 4. a directional drilling machine; 5. and (3) drilling rod.
Detailed Description
The invention is described in further detail below with reference to fig. 1-2.
The embodiment of the invention discloses a construction method for hole cleaning of a large-diameter pipeline pulling pipe.
Referring to fig. 1-2, a construction method for pipe pulling and hole cleaning of a large-diameter pipe comprises the following construction steps:
s1: and (3) preparation of construction: preparing a directional drilling machine 4, a drill rod 5, a plurality of large-diameter extrusion reamers and a pipeline transmission ditch;
s2: measuring and paying off;
s3: and (3) equipment installation: discharging a site control line and equipment placement positions of the directional drilling machine 4 according to the design pile and the construction drawing, ensuring that the center line of the directional drilling machine 4 forms a straight line with an earth entering point and an earth exiting point, and detachably connecting a plurality of large-diameter extrusion reamers of different types in series;
s4: welding and heat preservation of pipelines: the pipeline sending ditch is internally provided with pipelines and the pipelines are welded;
s5: slurry configuration;
s6: drilling a guide hole, and connecting a directional drilling machine 4 with a drill rod 5;
s7: reaming: connecting the reamer at the tail with a drill rod 5, and dragging the combined reamer into a guide hole by the directional drilling machine 4 through the drill rod 5 to enlarge the guide hole;
s8: washing holes: and the directional drilling machine 4 is started to drive the combined reamer to rotate and drag, and the rock scraps and mud strips deposited after reaming are discharged, so that the smoothness of the whole guide hole is ensured, and the reamer is removed after the dragging is completed.
The construction method is simple and easy to operate, can be installed at any time when required on site, can be reused, and particularly saves time and materials when large-diameter pipeline is drawn and constructed, improves the hole forming rate of one-time hole washing, ensures that engineering is completed on time, and saves cost. In addition, the construction method perfectly combines the back dragging power of the directional drilling equipment for large-diameter pipeline construction, connects a plurality of large-diameter extrusion reamers of different types in series, drives the combined reamer to rotate and drag through the drill rod 5, and brings residual rock scraps and mud strips in the guide hole out of the hole.
The construction principle of large diameter pipeline pulling and hole washing is that the horizontal directional drilling machine 4, the direction control instrument and other equipment are used to drill the guide hole, multi-stage reaming, hole washing and back-dragging pipe laying according to the preset track, thus completing the underground pipeline laying. Mainly comprises three steps of drilling a guide hole, multi-stage reaming, hole washing and back dragging.
The construction preparation comprises site preparation, drilling machine selection, pipeline transmission ditch arrangement, slurry pool arrangement, pipe head manufacture and construction water, wherein the site preparation is that the site is 50m & ltx & gt 30m of the site to be drilled at the site, and the site is leveled and compacted, so that the construction channel is smooth and free of water accumulation, and the safety construction requirement is met. The approach of the drilling machine, the power station, the slurry pump and other equipment is ensured to be in place, and the large-scale vehicle in-and-out is satisfied. The size of the slurry pond is 10m multiplied by 5m multiplied by 2m, and the size of the pond is 3m multiplied by 2m. The land of the unearthed site is 40m multiplied by 30m, and is leveled and compacted.
The drilling machine is selected, and the rated back-dragging force of the horizontal directional drilling machine 4 used for construction can be selected according to 1.5-3.0 times of the calculated value of the designed back-dragging force. In this embodiment, a safety factor of 3.0 times the maximum pull-back force is taken.
Wherein, the pipeline send ditch to arrange: the transmission trench is excavated before the pipeline enters the field, the trench width satisfies the pipeline installation width, the trench depth satisfies the pipeline floating requirement, and in this embodiment the pipeline transmission trench width x depth=1.5dx1.5d (D is the pipeline outer diameter).
Before the back towing, the end of the pipeline is required to be sealed by a welding end socket, water is prevented from entering the pipeline during the back towing, the depth of water injection in the transmission ditch is 1.5m, and the two sides of the ditch are required to be provided with edge protection and warning marks after the water injection is finished.
Slurry pond arrangement: digging 1 slurry discharging pool and water reservoir at the soil entering point and the soil exiting point respectively, wherein the water reservoir size of the slurry discharging pool is 10m multiplied by 5m multiplied by 2m, and the slope gradient is 1: and 0.75, laying waterproof plastic cloth in the pit.
The required Q235 steel of the pipe nipple, diameter, wall thickness are the same as the diameter of the working pipeline, groove welding is adopted, the width of the welding seam is about 2mm which covers both sides of the groove, and the reinforcement height is 1 mm-3 mm.
DN65 fire hose is connected with municipal water supply network to send water into water storage tank, and after pipe pulling is finished, water in groove is discharged to peripheral rain and sewage network nearby.
In this embodiment, the measurement pay-off is hosted by a professional surveyor participating in pile extension, and the measuring instrument is verified to be acceptable by the legal metering department and used within the validity period. And measuring and paying off according to the design plan view, the section view, the design control pile and the leveling stake, adopting GPS positioning, measuring by a total station, and protecting the whole process of the measurement control pile in the measuring and paying off process. Firstly rechecking the accuracy of the two-end control piles according to the design drawing, and then discharging the pipeline through the center line and the center line of the position of the drilling machine according to the two-end control piles provided by the design drawing. After the pile is fixed by paying off through the central line, the central line of the main pipeline is discharged, the traversing pipeline is arranged in a straight line with the traversing central line, and the central lines of the connecting sections at the two ends are discharged during paying off.
When the equipment is installed, the drilling machine is in place, a drill field control line and the equipment placement position are discharged according to the design pile and the construction drawing, and the center line of the drilling machine is ensured to form a straight line with the soil entering point and the soil exiting point. The instruments used to ensure the accuracy of the payout should be GPS located. For the installation of a drilling machine, double-layer plastic cloth is paved on equipment sites such as a storage drilling machine, a generator, a slurry pump, a slurry tank and the like, and all parts of the drilling machine are assembled and run in a trial mode. And calibrating and recording the direction control parameters according to the operation rules for measuring the direction control parameters.
In the pipeline welding and heat preservation, the pipeline welding and heat preservation are carried out in a transmission ditch which is excavated and completed before construction.
The welding seam of the pipeline is a butt-joint groove welding seam, the width of the welding seam is about 2mm which covers the two sides of the groove, and the reinforcement height is 1 mm-3 mm. All welding seams are primed by argon arc welding, and are filled and covered by manual arc welding. After the welded junction is qualified through flaw detection, the thermal insulation repair can be performed, and after the thermal insulation repair is qualified, the dragging operation can be performed.
For slurry configuration, the slurry not only can keep the hole wall stable and prevent collapse, but also can play a good lubricating role on the pipe laying, and the friction resistance between the pipeline and the hole wall is greatly reduced. And (3) compiling a preparation scheme according to the process requirements and geological conditions of the current crossing mud, determining a correct mixing sequence, and preparing mud meeting the requirements according to different geological layers. According to the characteristics of stratum, high-quality special soil powder for directional drilling is selected and matched with additives in a certain proportion.
In this example, a weak slurry is selected, that is, a slurry is prepared using surface water with a quantity of soda ash added to increase the performance index of the slurry. And adding a proper amount of polymer organic matters. The basic proportion is: water: soil: organic polymer = 1:0.05:0.06. the mud properties are adjusted appropriately at different process stages.
When the guide hole is drilled, the drilling machine needs to be used for trial drilling, the time of the drilling machine needs to be no less than 15 minutes before construction, and the situation that each part of the drilling machine runs normally and the drilling bit nozzle can drill after mud flows is determined.
When the guide hole is drilled, a direction control curve is drawn according to the designed crossing curve, a direction control scheme is determined, and the artificial magnetic field is used for drilling the guide hole. When the first drill rod 5 drills into the soil, the first drill rod is slightly pressed and slowly rotated, the soil-entering position is stabilized, and the drilling can be continued after the first drill rod meets the design soil-entering angle; when the guide hole is drilled, the straight line section measurement and calculation frequency is preferably once for each drill rod 5; when the drill rods 5 drill, the maximum bending angle of each drill rod 5 is not more than 1.0 degrees, and the accumulated bending angle of four continuous drill rods 5 is not more than 2.6 degrees.
The deviation of the guide holes should correspond to: the deviation between the guide hole curve and the design curve is not more than 1%, and the longitudinal deviation of the soil outlet point along the design axis is controlled within the range of +4-3 m; the lateral deviation is not more than + -0.86 m. In order to accurately follow a predetermined path, the driller must control the direction of the drilling of the bit body, sometimes also requiring direction changes. The simple principle of direction change is: when the drill bit body rotates and advances, the drill bit body linearly advances; when not rotating but only advancing, the bit body travels in an arc. Essentially, a complete pilot hole is formed by a series of straight holes connected by a direction-changing push.
The induction probe is used for receiving the earth magnetic field, then generating an electric signal, processing the electric signal, transmitting the electric signal into the signal receiver, and then an operator uses a computer to control the direction of the drill bit according to the reflected data in the receiver, so that the drill bit is controlled to accurately complete a guiding curve.
In the precision control of the guide hole, an artificial magnetic field is planned to be arranged at the soil inlet and outlet points, and an accurate reference azimuth angle is determined by the soil inlet side magnetic field, so that large deviation is avoided in the traversing process; after the land is opposite, the right-left deviation of an accurate curve is determined by using the magnetic field of the soil outlet point, so that the soil outlet is accurate. Meanwhile, the operation of each drill rod 5 is ensured to conform to the curvature radius range specified by the design according to the construction specification in construction. And drawing a direction control curve according to the designed traversing curve, determining a direction control scheme, and drilling a guide hole by using an artificial magnetic field. When the D1200 pipeline drill rods 5 are drilled, the maximum bending angle of each drill rod 5 is not more than 1 degree, and the accumulated bending angle of 4 continuous drill rods 5 is not more than 2.6 degrees. The deviation of the guide holes should correspond to: the deviation of the pilot Kong Shiji curve from the design curve should not be greater than 1%,
according to the angle of the earth entering point of the design drawing, the specification requires that the earth entering point of the guide hole is generally 8-18 degrees, the earth entering point of the guide hole is 4-12 degrees, under the action of the power head, the drill bit drives the drill rod 5 to rotate and advance, the directional drilling machine 4 receives the earth magnetic field by utilizing the magnetic induction probe, generates an electric signal, processes the electric signal and transmits the electric signal into the signal receiver, and then an operator utilizes a computer to control the direction of the drill bit according to the reflected data in the receiver, so that the drill bit is controlled to accurately complete the guide curve, and finally the drill bit is drilled from the designed earth entering point.
In the multistage reaming, the guide hole is completed, the drill bit is timely disassembled after being unearthed, the reamer is installed for reaming, slurry is sprayed before the reamer enters the hole, whether the water nozzle is smooth is checked, and the reaming operation is started after all the problems are avoided.
In this embodiment, three different types of large diameter squeeze reamers are connected in series, wherein the largest reamer 1 squeezes back mud and cuttings in the pipe diameter before, and the subsequent reamers carry out the same way on the residual mud and cuttings.
In the present embodiment, the large diameter squeeze reamer includes a maximum-sized reamer, a medium-sized reamer 2, and a minimum-sized reamer 3, the maximum-sized reamer being located in front, the minimum-sized reamer 3 being located in the middle, and the medium-sized reamer 2 being located at the end. Adjacent large diameter squeeze reamers are connected by threads.
In this embodiment, the pilot hole is DN1950, the largest size reamer is phi 1950, the smallest size reamer is 3 phi 1650, and the medium size reamer is 2 phi 1800.
After the pilot hole is completed, the drilled hole is enlarged to a proper diameter to facilitate the installation of the finished pipeline, the process is called reaming, and the final hole diameter of the horizontal directional drilling pipeline crossing engineering is generally 1.2-1.5 times of the outer diameter of the pipeline. The reamer is connected to the drill pipe 5 on the opposite side of the rig, and then rotated back into the pilot hole by the rig to enlarge the pilot hole while a large amount of mud is pumped into the borehole to ensure borehole integrity and non-collapse and to carry back the cuttings and slivers.
After reaming is completed, in order to prevent the sediment of the residual rock scraps and mud strips from affecting the smoothness of the guide holes, a combined hole washer is adopted to wash the holes, the rock scraps and mud strips precipitated after reaming are taken out, the smoothness of the whole guide holes is ensured, and meanwhile, the smoothness degree in the holes can be checked and judged through the speed of hole washing.
In this embodiment, in S7, one end of the reamer is attached to the drill pipe 5 and the other end is attached to the pipe by a transfer case.
In the present embodiment, in S8, the directional drilling machine 4 is started to pull back the reamer, and the directional drilling machine 4 is pulled slowly and rotated quickly. The mud strips and rock fragments in the pipe diameter are extruded and dragged back by the largest reamer 1, and the residual mud strips and rock fragments are carried out by the subsequent reamers in the same way. The transfer case can prevent the finished pipe from rotating with the reamer to ensure that the finished pipe is smoothly dragged into the borehole. The back-hauling is performed by the drilling machine, and a large amount of slurry is also required to be matched, and the back-hauling process is continuously performed until the reamer and the finished pipeline break out from one side of the drilling machine.
After reaming is completed, part of the guide hole still has rock scraps and mud strips which are not carried out along with the reamer, and in order to prevent the residual rock scraps and mud strips from depositing into the bottom of the guide hole and affecting the smoothness of the guide hole, the guide hole is required to be washed.
And connecting the reamer with the maximum diameter on the drill rod 5 at the unearthed point, driving the reamer to rotate and drag back by the drill rod 5, and taking out the residual rock scraps and mud strips in the guide hole from the hole.
In this embodiment, a combined hole washer is used to wash the holes: three types of extrusion reamers phi 1950, phi 1650 and phi 1800 are connected in series in a threaded manner before hole cleaning. After the series connection is completed, connecting the phi 1950 reamer with the drill rod 5 at the position of the unearthed point; the drill rod 5 must ensure that the drill rod is connected in place and firm to prevent tripping accidents in the back-expanded hole washing process, then the drilling machine is started to drag back to the soil entering point, when the back-dragging is carried out, three hole reamers are rotated simultaneously through the drill rod 5 to break and bring out rock scraps and mud strips deposited in the guide holes, the smoothness of the whole guide holes is ensured, the drilling speed is controlled in the back-dragging process, the drilling speed is not easy to be neglected, the drilling is stopped, the serious deformation of the hole diameter is easy to be caused, and meanwhile, the cleaning shape in the hole can be judged through the torque, the pulling force and the back-sizing condition of the directional drilling when the back-dragging is carried out through the hole washing. The combined hole washer reduces the times of repeated back-dragging and hole washing, and improves the hole washing efficiency; the mechanical arm is utilized to replace manual dismantling of the drill rod, so that the drill rod dismantling time is shortened, the directional drilling construction efficiency is improved, and the labor cost is saved
The equipment is easy to install, and no complex assembling program exists; the material is not required to be added, and only a field reaming tool is used; the device model is not required to be changed, and the device can be implemented by using a directional drill with the power required by tube pulling; the construction efficiency of hole washing is effectively enhanced, and the effect can be achieved only by dragging once; the operation is simple, and the operation is only required to be carried out according to the normal back-dragging construction steps. The problem of low repeated dragging efficiency of the drill bit in the hole washing process of the large-diameter pipeline is solved; the problems that in the hole washing process of a single drill bit, the hole washing effect is unstable and the quality is difficult to guarantee are solved; the problem of high equipment cost caused by repeated dragging of high-power directional drilling equipment is solved.
The large-diameter pipeline curve of the construction method passes through the directional drill of the river channel to construct accurate guide, so that the buried depth of the pipeline is ensured, and other pipelines around the pipeline can be avoided accurately. Compared with other construction methods (tunnel method and jacking method) of crossing engineering, the method is simpler and safer in the construction process, and the construction operation area occupies smaller area. The method is particularly suitable for steel pipes or PE pipes with pipe diameters DN800 and above and lengths of more than 300m, and construction environments of sand, clay strata and incapability of river diversion. The two sides of the crossing access point are provided with better roads which are led to the vicinity of the crossing site, and the drilling machine is suitable for assembly construction of the drilling machine.
The method has little influence on the landscaping around the river and the road operation, greatly saves investment cost, and also avoids the damage of the operations such as earth excavation, outward transport, river diversion and the like to the surrounding environment. In addition, the directional drilling construction is less influenced by rainy season, and the construction period of pipeline penetration is saved to the greatest extent. The non-excavation pipe laying technology has the advantages that no water or underwater operation is adopted, damage to the ground surface can be reduced in the construction process, influence on the surrounding environment is reduced, and meanwhile construction safety is guaranteed.
The above embodiments are not intended to limit the scope of the present invention, so: all equivalent changes in structure, shape and principle of the invention should be covered in the scope of protection of the invention.
Claims (10)
1. A large-diameter pipeline pipe pulling and hole washing construction method is characterized by comprising the following steps of: the construction method comprises the following construction steps:
s1: and (3) preparation of construction: preparing a directional drilling machine, a drill rod, a plurality of large-diameter extrusion reamers and a pipeline sending ditch;
s2: measuring and paying off;
s3: and (3) equipment installation: discharging a control line and equipment placement positions of the directional drilling machine field according to the design pile and the construction drawing, ensuring that the center line of the directional drilling machine forms a straight line with the soil entering point and the soil exiting point, and detachably connecting a plurality of large-diameter extrusion reamers of different types in series;
s4: welding and heat preservation of pipelines: the pipeline sending ditch is internally provided with pipelines and the pipelines are welded;
s5: slurry configuration;
s6: drilling a guide hole, and connecting a directional drilling machine with a drill rod;
s7: reaming: connecting the reamer at the tail with a drill rod, and dragging the combined reamer into a guide hole through the drill rod by a directional drilling machine to enlarge the guide hole;
s8: washing holes: and starting the directional drilling machine to drive the combined reamer to rotate and drag, discharging the rock scraps and mud strips deposited after reaming, ensuring the smoothness of the whole guide hole, and completing the disassembly of the reamer by dragging.
2. The large-diameter pipeline pulling and hole washing construction method according to claim 1, wherein the method comprises the following steps of: the large-diameter extrusion type reamer is characterized in that a plurality of large-diameter extrusion type reamers are respectively of different types.
3. The large-diameter pipeline pulling and hole washing construction method according to claim 2, wherein the method comprises the following steps of: the three large-diameter extrusion type reamers with different types are connected in series, wherein the largest reamer extrudes and drags mud strips and rock fragments in pipe diameters in front, and the subsequent reamers carry out residual mud strips and rock fragments in the same way.
4. A large diameter pipe pulling and hole washing construction method according to claim 3, wherein: the large-diameter extrusion reamer comprises a maximum-type reamer, a medium-type reamer and a minimum-type reamer, wherein the maximum-type reamer is positioned in front, the minimum-type reamer is positioned in the middle, and the medium-type reamer is positioned at the end.
5. The large-diameter pipeline pulling and hole washing construction method according to claim 4, wherein the method comprises the following steps of: the maximum size reamer is phi 1950, the minimum size reamer is phi 1650, and the medium size reamer is phi 1800.
6. The large-diameter pipeline pulling and hole washing construction method according to claim 1, wherein the method comprises the following steps of: in S6, the pilot hole is pulled back into the pilot hole by the directional drilling machine, enlarging the pilot hole, and simultaneously pumping a large amount of mud into the borehole.
7. The large-diameter pipeline pulling and hole washing construction method according to claim 1, wherein the method comprises the following steps of: in S7, one end of the reamer is connected to the drill pipe, and the other end is connected to the pipeline through the transfer case.
8. The large-diameter pipeline pulling and hole washing construction method according to claim 1, wherein the method comprises the following steps of: in S8, the directional drilling machine is started to slowly pull and quickly rotate in the process of pulling the reamer back.
9. The large-diameter pipeline pulling and hole washing construction method according to claim 8, wherein the method comprises the following steps of: in S8, the back-dragging process is matched with the slurry, and the back-dragging process is continuously carried out until the reamer and the pipeline break out from one side of the directional drilling machine.
10. The large-diameter pipeline pulling and hole washing construction method according to claim 1, wherein the method comprises the following steps of: the earth outlet point of the guide hole is generally 8-18 degrees, and the earth inlet point of the guide hole is 4-12 degrees.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311472189.XA CN117328803A (en) | 2023-11-07 | 2023-11-07 | Hole cleaning construction method for large-diameter pipeline pulling |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311472189.XA CN117328803A (en) | 2023-11-07 | 2023-11-07 | Hole cleaning construction method for large-diameter pipeline pulling |
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