CN113236157A - Drilling pile-forming construction system and working method thereof - Google Patents

Abstract

The invention discloses a drilling and pile-forming construction system which comprises a gas-lift reverse circulation drilling machine main machine, wherein the gas-lift reverse circulation drilling machine main machine is connected with a slurry purification device, the output end of the slurry purification device is connected with a slurry return pipe, and the slurry return pipe is communicated into a drill hole drilled by a drill rod of the gas-lift reverse circulation drilling machine main machine. The invention also discloses a working method of the drilling pile-forming construction system. By adopting the invention, the discharged slurry can be processed while the construction is carried out, the cyclic utilization of the slurry in the construction process is realized, and the slurry making cost is reduced; the separated drilling slag gravel in the mud purification treatment process can be used for filling a sidewalk and a beam slab prefabricated site, so that purchased gravel is reduced; the facilities for transporting the slurry outside and performing harmless treatment, the land and the configuration of related personnel are saved. Therefore, the invention can greatly reduce the cost of drilling and pile-forming construction and reduce the environmental pollution.

Description

Drilling pile-forming construction system and working method thereof

Technical Field

The invention relates to building construction equipment and a working method thereof, in particular to a drilling pile-forming construction system and a working method thereof.

Background

The gas lift reverse circulation drilling machine is frequently used for constructing large-diameter and ultra-long pile foundations of bridges across rivers, slurry is continuously poured into drill holes formed by drill bits of the drilling machine in the working process of the gas lift reverse circulation drilling machine, meanwhile, compressed air is introduced into a drill rod through an air compressor, a mixture of bubbles and slurry drilling slag is formed in an inner cavity of the drill rod, and the density of the mixture is smaller than that of the slurry outside the drill rod. Under the action of a liquid column in the drill hole and the atmospheric pressure, slurry between the hole wall of the drill hole and the drill rod flows to the bottom of the drill hole, drilling slag cut by the drill bit is brought into an inner cavity of the drill rod, and light bubble liquid formed by the drilling slag, the slurry and compressed air is discharged through the drill rod and the slurry discharge pipe under the action of pressure difference. In the existing construction process adopting the gas lift reverse circulation drilling machine, slurry needs to be specially configured and continuously poured, and the slurry discharged from a drill rod can not be used any more due to the fact that a large amount of drilling slag is wrapped by the slurry and can only be discharged additionally and subjected to subsequent treatment. The discharged slurry is conveyed and treated by a large amount of facilities and sites, and a lot of labor is also needed, so that the construction cost is greatly increased, and the environment is polluted to a certain extent by the transportation and treatment of the slurry. The invention with the publication number of CN108060893A is specially beneficial to the construction method of the gas lift reverse circulation drilling machine disclosed in 2018, 5 month and 22 days, and comprises two steps of primary drilling and normal drilling, and the drilling is smoother through the control of the primary drilling. The method is characterized in that a soil sample in a drill hole is fished in the normal drilling process, and under different geological conditions, mud with different performances is selected, so that the quality of the hole wall under different geological conditions is ensured. However, the method for filling the slurry is not different from the conventional process, and a corresponding solution is not provided for the problem of treatment of the discharged slurry.

Disclosure of Invention

In the existing construction process adopting the gas lift reverse circulation drilling machine, the slurry discharged from the drill rod is not recycled but only can be discharged additionally and subjected to subsequent treatment, so that the construction cost is greatly increased, certain pollution is caused to the environment, and in order to overcome the defects, the invention provides the drilling and pile-forming construction system and the working method thereof, the slurry discharged from the drill rod can be treated on site and reused, the construction cost is reduced, and the environmental pollution is reduced.

The technical scheme of the invention is as follows: a drilling and pile-forming construction system comprises a gas-lift reverse circulation drilling machine main machine, wherein the gas-lift reverse circulation drilling machine main machine is connected with a slurry purification device, the output end of the slurry purification device is connected with a slurry return pipe, and the slurry return pipe is communicated into a drill hole drilled by a drill rod of the gas-lift reverse circulation drilling machine main machine. When the main machine of the gas lift reverse circulation drilling machine operates, slurry discharged from a drill rod is drained to the slurry purification device through the pipeline, after purification and screening are carried out in the slurry purification device, drilling slag is separated, regenerated slurry meeting the use requirement is formed, and then the regenerated slurry flows back into a drill hole from the slurry purification device through the slurry return pipe, so that the slurry can be recycled, special continuous slurry configuration and continuous filling are not needed, the slurry using amount can be greatly reduced, the discharged slurry does not need to be conveyed remotely and subjected to harmless treatment, a large number of facilities and sites and related personnel configuration can be saved, and the construction cost is greatly reduced. In addition, because the mud forms closed circulation between the gas lift reverse circulation drilling machine main machine and the mud purification device, the leakage and the loss of the mud are greatly reduced, and the pollution to the environment is reduced.

Preferably, the mud purification device comprises a mud storage tank, a coarse screen cylinder, a fine screen cylinder and a middle storage tank, the coarse screen cylinder and the fine screen cylinder are connected to the top of the mud storage tank and are respectively communicated with the mud storage tank, the coarse screen cylinder is the input end of the mud purification device, the middle storage tank is the output end of the mud purification device, the inner cavity of the drill rod is connected with the coarse screen cylinder through a mixture discharge pipe, the mud storage tank is connected with a hydraulic cyclone through a self-circulation pipe, a slag slurry pump is arranged on the self-circulation pipe, a discharge fixing port of the hydraulic cyclone is connected with the fine screen cylinder, an overflow port of the hydraulic cyclone is connected with the middle storage tank, and the middle storage tank is connected with a mud backflow pipe. The slurry discharged from the drill rod is filtered by the coarse screen cylinder, the drilling slag with larger particles is intercepted, the residual slurry containing smaller particles enters the slurry storage tank through the coarse screen cylinder, and is pumped by the slurry pump to be conveyed to the hydrocyclone from the slurry storage tank through the self-circulation pipe. The hydrocyclone can separate out the heavier coarse-particle silt in the sewage, the relatively coarse-particle substances are thrown to the inner wall of the hydrocyclone and rotate downwards to be discharged together with the formed concentrated solution from a discharge port at the lower part, and the concentrated solution enters a fine screen cylinder for finer filtration; and after the relatively small particulate matters rotate to a certain degree, the upward swirling vortex formed along with the rotation of the liquid in the slurry is output from an overflow port at the higher part of the hydrocyclone and enters a middle storage tank for accumulation, and slurry containing relatively fine silt is in the middle storage tank and is used as regeneration slurry to flow back into the drill hole from a slurry return pipe. After the purification treatment of the mud purification device, large-particle drilling slag is effectively separated, the rest slurry containing fine silt has good fluidity and density, and can meet the construction requirements of pouring and drilling, so that the slurry can be recycled, and the separated solid-phase drilling slag can also be used as an auxiliary material for on-site utilization without external transportation.

Preferably, the coarse screening barrel comprises a coarse screening barrel body and a coarse screening device, the coarse screening barrel body is communicated with the pulp storage tank, the coarse screening device is mounted at the top of the coarse screening barrel body and is connected with the mixture discharge pipe, and a coarse screening drilling residue discharge port is further formed in the coarse screening device. The coarse screen device plays a role in filtering and screening, larger solid-phase substances are intercepted and pass through liquid-phase substances and smaller solid-phase substances, and the coarse screen cylinder body provides a mounting platform and a closed filtered mud conveying channel for the coarse screen device. The large-particle drilling slag separated by the coarse screen can be discharged and collected from a screen drilling slag discharge port and is used for filling a prefabricated site or filling an access road.

Preferably, two coarse screen barrels are arranged, a swing type drainage groove and a drainage groove support are arranged between the two coarse screen barrels, two ends of the drainage groove support are welded on the two coarse screen barrels respectively, the middle of the swing type drainage groove is hinged on the drainage groove support, two ends of the swing type drainage groove correspond to the two coarse screen barrels respectively, and an oil cylinder is connected between one end of the swing type drainage groove and the drainage groove support. A coarse screen section of thick bamboo is mud purifier's input, and the large granule solid phase material of holding back needs in time to be cleared up, avoids blockking the coarse screen ware, causes the restriction of mud circulation, influences the efficiency of construction. Two coarse screen cylinders can be used alternately, the inclination direction of the swing type drainage groove is changed by switching the state of the oil cylinder, the coarse screen cylinder is selected to receive the slurry discharged from the drill rod, and the unselected coarse screen cylinder utilizes the time to clean the large-particle solid-phase substances screened out in time.

Preferably, the coarse screen device is hinged to the coarse screen cylinder. The coarse screen device can be overturned and inclined, and the solid-phase substances screened out by the coarse screen device can be poured out only by being overturned around the hinged point.

Preferably, the fine screen cylinder comprises a fine screen cylinder body and a fine screen device, the fine screen cylinder body is communicated with the pulp storage tank, the fine screen device is arranged at the top of the fine screen cylinder body and is connected with the solid discharge port of the hydrocyclone, and the coarse screen device is also provided with a fine screen drilling residue discharge port. The fine screen device plays a role in further filtering and screening, smaller solid-phase substances are intercepted and pass through liquid-phase substances and smaller solid-phase substances, and the fine screen cylinder body provides a mounting platform and a closed filtered mud conveying channel for the fine screen device. The small-particle drilling slag separated by the fine sieve can be discharged and collected from a sieve drilling slag discharge port and is used for assisting in the preparation of building materials.

Preferably, the fine screen is arranged obliquely. The solid phase substance separated by the fine sieve is fine and easy to adhere to the fine sieve, and is not easy to be discharged thoroughly. The fine screen device is obliquely arranged, and fine solid-phase substances in the slurry conveyed to the fine screen device can fall to the lowest part of the fine screen device under the action of gravity, so that the fine solid-phase substances are more concentrated and easier to discharge.

Preferably, the intermediate tank is fixed to the stock chest. Therefore, all components of the mud purification device can be arranged more closely, the structure is more compact, and the floor area of the mud purification device is reduced.

The working method of the drilling pile-forming construction system comprises the following steps:

firstly, positioning a main machine of a gas-lift reverse circulation drilling machine and an air compressor;

step two, slurry preparation;

starting the main machine of the gas-lift reverse circulation drilling machine, stirring the stratum loose, and generating a drilled hole;

the air compressor inputs compressed air to the main machine of the gas-lift reverse circulation drilling machine, the compressed air is conveyed along the interior of the drill rod and is mixed with the slurry and the drilling slag in the interior of the drill rod, and the formed mixture of the bubbles, the slurry and the drilling slag flows to a mixture discharge pipe along the drill rod;

the mixture is conveyed to a slurry purification device through a mixture discharge pipe, the slurry purification device is used for purifying and separating the mixture, and the slurry after purification and separation flows into a slurry storage tank;

the slurry in the slurry storage tank is drained back to the drilled hole through a slurry return pipe;

and step seven, utilizing the screened solid-phase substances on site in a construction site for filling a construction pavement or a beam slab prefabricated site.

The working method of the drilling pile-forming construction system can not only recycle the slurry, but also fully utilize the drilling slag generated by drilling, greatly reduce construction waste and the waste discharge problem derived from the construction waste, greatly reduce the construction cost and reduce the pollution to the environment.

The invention has the beneficial effects that:

the construction cost is reduced. By adopting the invention, the discharged slurry can be processed while the construction is carried out, the cyclic utilization of the slurry in the construction process is realized, and the slurry making cost is reduced; the separated drilling slag gravel in the mud purification treatment process can be used for filling a sidewalk and a beam slab prefabricated site, so that purchased gravel is reduced; the facilities for transporting the slurry outside and performing harmless treatment, the land and the configuration of related personnel are saved. Therefore, the invention can greatly reduce the cost of drilling and pile-forming construction.

Is more beneficial to environmental protection. In the invention, because the mud forms closed circulation between the main machine of the gas-lift reverse circulation drilling machine and the mud purification device, the leakage and loss of the mud are greatly reduced, and the pollution to the environment is reduced.

Drawings

FIG. 1 is a schematic diagram of a structure to which the present invention is applied;

FIG. 2 is a schematic diagram of a system layout according to the present invention;

FIG. 3 is a schematic view of a partial structure of the slurry purification apparatus according to the present invention.

In the figure, 1-a gas lift reverse circulation drilling machine host, 2-a mud purification device, 3-a drill rod, 4-a mud return pipe, 5-a mud storage tank, 6-a coarse screen cylinder, 7-a fine screen cylinder, 8-a middle storage tank, 9-a mixture discharge pipe, 10-a self-circulation pipe, 11-a hydrocyclone, 12-a slurry pump, 13-an air compressor, 14-a drill bit, 15-a swing type drainage groove, 16-a drainage groove bracket, 17-a reversing oil cylinder and 18-a steel protection cylinder.

Detailed Description

The invention is further illustrated by the following specific embodiments in conjunction with the accompanying drawings.

Example 1:

as shown in fig. 1 and 2, the drilling and pile-forming construction system is used for construction of large-diameter and ultra-long pile foundations of bridges across rivers. The drilling and pile-forming construction system comprises a gas-lift reverse circulation drilling machine host 1, wherein the gas-lift reverse circulation drilling machine host 1 is connected with a slurry purification device 2, the output end of the slurry purification device 2 is connected with a slurry return pipe 4, and the slurry return pipe 4 is communicated into a drill hole drilled by a drill rod 3 of the gas-lift reverse circulation drilling machine host 1. The mud purification device 2 comprises a mud storage tank 5, a coarse screen cylinder 6, a fine screen cylinder 7 and a middle storage tank 8, the coarse screen cylinder 6 and the fine screen cylinder 7 are connected to the top of the mud storage tank 5 and are respectively communicated with the mud storage tank 5, the coarse screen cylinder 6 is an input end of the mud purification device 2, the middle storage tank 8 is fixed on the mud storage tank 5, the middle storage tank 8 is an output end of the mud purification device 2, an inner cavity of a drill rod 3 is connected with the coarse screen cylinder 6 through a mixture discharge pipe 9, the mud storage tank 5 is connected with a feed inlet of a hydraulic cyclone 11 through a self-circulation pipe 10, a slurry pump 12 is arranged on the self-circulation pipe 10, a discharge port of the hydraulic cyclone 11 is connected with the fine screen cylinder 7, an overflow port of the hydraulic cyclone 11 is connected with the middle storage tank 8, the middle storage tank 8 is connected with a mud return pipe 4, and an outlet of the middle storage tank 8 is provided with an output valve. The coarse screen cylinder 6 comprises a coarse screen cylinder body and a coarse screen device, the coarse screen cylinder body is welded and communicated with the pulp storage tank 5, the coarse screen device is arranged at the top of the coarse screen cylinder body and connected with the mixture discharge pipe 9, and a coarse screen drilling slag discharge port is further arranged on the coarse screen device. The fine screen cylinder 7 comprises a fine screen cylinder body and a fine screen device, the fine screen cylinder body is welded and communicated with the pulp storage tank 5, the fine screen device is obliquely arranged at the top of the fine screen cylinder body and is connected with a solid discharge port of the hydrocyclone 11, and a fine screen drilling residue discharge port is also arranged on the coarse screen device.

The working method of the drilling pile-forming construction system comprises the following steps:

step one, a gas-lift reverse circulation drilling machine main machine 1 and an air compressor 13 are built and installed in place;

step two, slurry preparation;

starting the gas-lift reverse circulation drilling machine host 1, stirring the stratum to generate a drilled hole, driving a steel casing 18 into the drilled hole, positioning a drill bit 14 of the gas-lift reverse circulation drilling machine host 1 in the steel casing 18, and pouring prepared slurry into the steel casing 18;

step four, the air compressor 13 inputs compressed air to the main machine 1 of the gas-lift reverse circulation drilling machine, the compressed air is conveyed along the interior of the drill rod 3 and is mixed with the slurry and the drilling slag in the interior of the drill rod 3, and the formed mixture of the bubbles, the slurry and the drilling slag flows to a mixture discharge pipe 9 along the drill rod 3;

the mixture is conveyed to the slurry purification device 2 through the mixture discharge pipe 9, the mixture is filtered through a coarse screen of the coarse screen cylinder 6, drilling slag with larger particles is intercepted, the residual slurry containing smaller particles enters the slurry storage tank 5 through the coarse screen cylinder, the slurry is conveyed to the hydrocyclone 11 from the slurry storage tank 5 through the circulating pipe 10 through the suction of the slurry pump 12, and relatively coarse and heavy particulate matters are thrown to the inner wall of the hydrocyclone 11 and rotate downwards to be discharged together with the formed concentrated solution from a discharge port at the lower part, and then the concentrated solution enters the fine screen cylinder 7 for finer filtration; relatively small particulate matters are output from an overflow port at the higher part of the hydrocyclone 11 along with upward vortex formed by rotation of liquid in the slurry, enter the middle storage tank 8 for accumulation, and an output valve of the middle storage tank 8 is opened after being temporarily closed for five minutes, so that the slurry in the middle storage tank 8 forms enough accumulation amount to ensure continuous output;

step six, slurry containing fine silt is filled in the intermediate storage tank 8 and is used as regeneration slurry to be guided back to the drill hole through the slurry return pipe 4;

and step seven, loading and transporting the gravel and the fine sand obtained after screening to a construction site through a loader, and utilizing the gravel and the fine sand on site in the construction site for filling a construction access or a beam slab prefabricated site.

Example 2:

as shown in fig. 3, two coarse screen drums 6 are provided, a swing type drainage groove 15 and a drainage groove support 16 are arranged between the two coarse screen drums 6, two ends of the drainage groove support 16 are respectively welded on the two coarse screen drums 6, the middle part of the swing type drainage groove 15 is hinged on the drainage groove support 16, two ends of the swing type drainage groove 15 respectively correspond to the two coarse screen drums 6, a reversing oil cylinder 17 is connected between one end of the swing type drainage groove 15 and the drainage groove support 16, the bottom end of the reversing oil cylinder 17 is hinged on the drainage groove support 16, and the piston rod of the reversing oil cylinder 17 is hinged on the swing type drainage groove 15. The coarse screen device is hinged to the coarse screen cylinder, and a coarse screen device dumping oil cylinder is connected between the free end of the coarse screen device and the coarse screen cylinder. The actions of the reversing oil cylinder 17 and the dumping oil cylinder of the coarse screen device are controlled by the operating handle, and the rest is the same as the embodiment 1.

In the fifth step, the two coarse screen drums 6 can be used alternately, when the drilling slag screened out from the coarse screen device of one coarse screen drum 6 is accumulated to a set amount, the reversing oil cylinder 17 is started to change the inclination direction of the swing type drainage groove 15, one end of the swing type drainage groove 15 corresponding to the other coarse screen drum 6 sinks, so that the slurry discharged from the drill rod 3 is input into the other coarse screen drum 6 for filtering and screening through the drainage of the swing type drainage groove 15, the coarse screen drum 6 which is stopped at the moment utilizes the drilling slag screened out at the moment, and when the drilling slag is discharged, the coarse screen device dumping oil cylinder is started to enable the coarse screen device to overturn and incline, and the screened drilling slag is dumped out.

Claims (9)

1. The drilling and pile-forming construction system comprises a gas-lift reverse circulation drilling machine main machine (1) and is characterized in that the gas-lift reverse circulation drilling machine main machine (1) is connected with a slurry purification device (2), the output end of the slurry purification device (2) is connected with a slurry return pipe (4), and the slurry return pipe (4) is communicated into a drill hole drilled by a drill rod (3) of the gas-lift reverse circulation drilling machine main machine (1).

2. The drilling and pile-forming construction system as claimed in claim 1, wherein the slurry purification device (2) comprises a slurry storage tank (5), a coarse screen cylinder (6), a fine screen cylinder (7) and a middle storage tank (8), the coarse screen cylinder (6) and the fine screen cylinder (7) are connected to the top of the slurry storage tank (5) and are respectively communicated with the slurry storage tank (5), the coarse screen cylinder (6) is an input end of the slurry purification device (2), the middle storage tank (8) is an output end of the slurry purification device (2), an inner cavity of the drill rod (3) is connected with the coarse screen cylinder (6) through a drilling slag discharge pipe (9), the slurry storage tank (5) is connected with a hydrocyclone (11) through a self-circulating pipe (10), a slag slurry pump (12) is arranged on the self-circulating pipe (10), a discharge port of the hydrocyclone (11) is connected with the fine screen cylinder (7), an overflow port of the hydrocyclone (11) is connected with the middle storage tank (8), the middle storage tank (8) is connected with the slurry return pipe (4).

3. The drilling and pile-forming construction system as claimed in claim 2, wherein the coarse screen cylinder (6) comprises a coarse screen cylinder body and a coarse screen device, the coarse screen cylinder body is communicated with the slurry storage tank (5), the coarse screen device is arranged at the top of the coarse screen cylinder body and is connected with the drilling slag discharge pipe (9), and a coarse screen drilling slag discharge port is further arranged on the coarse screen device.

4. The drilling and pile-forming construction system as claimed in claim 3, wherein two coarse screen drums (6) are provided, a swing type drainage groove (15) and a drainage groove support (16) are provided between the two coarse screen drums (6), two ends of the drainage groove support (16) are respectively welded on the two coarse screen drums (6), the middle part of the swing type drainage groove (15) is hinged on the drainage groove support (16), two ends of the swing type drainage groove (15) respectively correspond to the two coarse screen drums (6), and an oil cylinder (17) is connected between one end of the swing type drainage groove (15) and the drainage groove support (16).

5. The drilling pile-forming construction system as claimed in claim 4, wherein the coarse screen device is hinged on the coarse screen cylinder.

6. The drilling and pile-forming construction system as claimed in claim 2, wherein the fine screen cylinder (7) comprises a fine screen cylinder body and a fine screen device, the fine screen cylinder body is communicated with the slurry storage tank (5), the fine screen device is arranged at the top of the fine screen cylinder body and is connected with the discharge port of the hydraulic cyclone (11), and the coarse screen device is also provided with a fine screen drilling slag discharge port.

7. The system of claim 6, wherein the fine screen is disposed to be inclined.

8. A drilling and piling construction system according to any one of claims 2 to 7, wherein the intermediate storage tank (8) is fixed to the grout storage tank (5).

9. The working method of the drilling pile-forming construction system as claimed in any one of claims 1 to 8, characterized by comprising the steps of:

step one, a gas-lift reverse circulation drilling machine main machine (1) and an air compressor (13) are in place;

step two, slurry preparation;

starting the gas lift reverse circulation drilling machine main machine (1), stirring the stratum loose, and generating a drilled hole;

inputting compressed air into the main machine (1) of the gas-lift reverse circulation drilling machine by an air compressor (13), conveying the compressed air along the interior of the drill rod (3), mixing the compressed air with the slurry and the drilling slag in the interior of the drill rod (3), and enabling the formed mixture of the bubbles, the slurry and the drilling slag to flow to a drilling slag discharge pipe (9) along the drill rod (3);

fifthly, the mixture is conveyed to a mud purification device (2) through a drilling slag discharge pipe (9), the mud purification device purifies and separates the mixture, and the purified and separated mud flows into a mud storage tank (5);

the slurry in the slurry storage tank (5) is drained back to the drilled hole through the slurry return pipe (4);

and step seven, utilizing the screened solid-phase substances on site in a construction site for filling a construction pavement or a beam slab prefabricated site.

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