CN113236157B - Drilling pile forming construction system and working method thereof - Google Patents

Abstract

The invention discloses a drilling 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 mud purifying device, the output end of the mud purifying device is connected with a mud return pipe, and the mud return pipe is communicated into a drilling 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 treated while construction is performed, so that the recycling of the slurry in the construction process is realized, and the slurry manufacturing cost is reduced; the separated drilling slag gravel in the slurry purification treatment process can be used for filling the pavement and the beam slab prefabricated site, so that outsourcing gravel is reduced; saving facilities, land and related personnel configuration for slurry outward transportation and innocent treatment. Therefore, the invention can greatly reduce the cost of drilling pile forming construction and lighten 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

When the construction of the large-diameter and ultra-long pile foundation of the river-crossing bridge is carried out, a gas lift reverse circulation drilling machine is frequently used, in the working process of the gas lift reverse circulation drilling machine, slurry is continuously poured into a drilling hole formed by a drilling bit of the drilling machine, 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 slurry outside the drill rod. Under the action of a liquid column and atmospheric pressure in a drilling hole, mud between the wall of the drilling hole and a drill rod flows to the bottom of the hole, drill slag cut by a drill bit is brought into an inner cavity of the drill rod, and light bubble liquid formed by the drill slag, the mud and compressed air is discharged through the drill rod and a slurry discharging pipe under the action of pressure difference. In the existing construction process adopting the gas lift reverse circulation drilling machine, the slurry needs to be specially configured and is continuously poured, and the slurry discharged from the drill rod can not be used any more because a large amount of drilling slag is wrapped and can only be discharged separately and subjected to subsequent treatment. The discharged slurry is transported and treated by a large amount of facilities and sites, and a lot of manpower is needed, so that the construction cost is greatly increased, and the transportation and treatment of the slurry also cause certain pollution to the environment. The invention with the publication number of CN108060893A is specially used for 2018, 5 and 22 days to disclose a construction method of a gas lift reverse circulation drilling machine, which comprises two steps of primary drilling and normal drilling, and the drilling is smoother through primary drilling control. And (3) fishing out soil samples in the drilling holes in the normal drilling process, and selecting mud with different performances under different geological conditions to ensure the quality of the hole walls under different geological conditions. However, the method is not greatly different from the conventional process in the operation method of pouring the slurry, and a corresponding solution is not provided for the problem of treating 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 can only be discharged separately and subjected to subsequent treatment, so that the construction cost is greatly increased, and certain pollution is caused to the environment.

The technical scheme of the invention is as follows: the drilling pile forming construction system includes one main machine of gas lift reverse circulation drilling machine connected to one mud purifier, and one mud reflux pipe connected to the output of the mud purifier and communicated to the drilling hole drilled by the drill rod of the main machine. When the main machine of the gas lift reverse circulation drilling machine operates, discharged mud from the drill rod is drained to the mud purifying device through a pipeline, after the mud purifying device is used for purifying and screening, drilling slag is separated, regenerated mud meeting the use requirement is formed, and then the regenerated mud flows back to the drill hole from the mud purifying device through the mud return pipe, so that the mud can be recycled, the mud does not need to be specially and continuously configured and continuously poured, the mud consumption can be greatly reduced, and the discharged mud does not need to be conveyed and subjected to harmless treatment in a long distance, so that a large number of facilities, sites and related personnel can be saved, and the construction cost is greatly reduced. In addition, because the slurry forms a closed circulation between the main machine of the gas lift reverse circulation drilling machine and the slurry purifying device, the leakage and the loss of the slurry are greatly reduced, and the pollution to the environment is reduced.

Preferably, the slurry purifying device comprises a slurry storage tank, a coarse screen cylinder, a fine screen cylinder and a middle storage tank, wherein the coarse screen cylinder and the fine screen cylinder are connected at the top of the slurry storage tank and are respectively communicated with the slurry storage tank, the coarse screen cylinder is an input end of the slurry purifying device, the middle storage tank is an output end of the slurry purifying device, an inner cavity of a drill rod is connected with the coarse screen cylinder through a mixture discharge pipe, the slurry storage tank is connected with a hydrocyclone through a self-circulation pipe, a slurry pump is arranged on the self-circulation pipe, a solid discharge port of the hydrocyclone is connected with the fine screen cylinder, an overflow port of the hydrocyclone is connected with the middle storage tank, and the middle storage tank is connected with a slurry return pipe. The slurry discharged from the drill rod is filtered by the coarse screen cylinder, the drilling slag with larger particles is trapped, the residual slurry containing smaller particles enters the slurry storage tank through the coarse screen cylinder, and the slurry is pumped by the slurry pump and is conveyed to the hydrocyclone from the slurry storage tank through the self-circulation pipe. The hydrocyclone can separate and remove heavy coarse-particle muddy sand in the sewage, relatively heavy particulate matters are thrown to the inner wall of the hydrocyclone and are rotated downwards to be discharged together with the formed concentrated liquid from a solid discharge port at the lower part, and the concentrated liquid enters a fine screen cylinder for finer filtration; the relatively small granular matters rotate to a certain degree and then are output from an overflow port at the higher part of the hydrocyclone along with the upward swirling flow formed by the rotation of the liquid in the slurry, and enter a middle storage tank for storage, wherein the middle storage tank is filled with slurry containing finer sediment and is used as regenerated slurry to flow back into a drilled hole from a slurry return pipe. After the purification treatment of the mud purification device, large-particle drilling slag is effectively separated, and the residual slurry containing finer sediment has good fluidity and density, so that the construction requirement of filling and drilling can be met, the cyclic utilization can be repeatedly carried out, and the separated solid-phase drilling slag can be used as an auxiliary material in situ without external transportation.

Preferably, the coarse screen cylinder comprises a coarse screen cylinder body and a coarse screen device, wherein the coarse screen cylinder body is communicated with the slurry storage tank, the coarse screen device is arranged at the top of the coarse screen cylinder body and is connected with the mixture discharge pipe, and the coarse screen device is also provided with a coarse screen drilling slag discharge port. The coarse screen device has the functions of filtering and screening, and entraps the larger solid phase substances and passes through the liquid phase substances and the smaller solid phase substances, and the coarse screen cylinder body provides a mounting platform and a closed filtered slurry conveying channel for the coarse screen device. Large-particle drill slag separated by the coarse screen can be discharged and collected from a screen drill slag discharge port and used for filling prefabricated places or channels.

Preferably, the two coarse screen drums are provided with a swinging drainage groove and a drainage groove support, two ends of the drainage groove support are respectively welded on the two coarse screen drums, the middle part of the swinging drainage groove is hinged on the drainage groove support, two ends of the swinging drainage groove respectively correspond to the two coarse screen drums, and an oil cylinder is connected between one end of the swinging drainage groove and the drainage groove support. The coarse screen cylinder is the input end of the mud purifying device, the trapped large-particle solid phase substances need to be cleaned in time, the blocking of the coarse screen is avoided, the restriction of mud circulation is caused, and the construction efficiency is influenced. The two coarse screen cylinders can be used alternately, the inclination direction of the swing type drainage groove is changed through state switching of the oil cylinder, so that the coarse screen cylinders are selected to receive slurry discharged from the drill rod, and the coarse screen cylinders which are not selected can timely clean the screened large-particle solid-phase substances by utilizing the time.

Preferably, the coarse screen is hinged to the coarse screen cylinder. The coarse screen can be overturned and inclined, and the screened solid can be poured out only by overturning around a hinging point when the solid phase substances screened by the coarse screen are discharged.

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 slurry storage tank, the fine screen device is arranged at the top of the fine screen cylinder body and is connected with a solid discharge port of the hydrocyclone, and a fine screen drilling slag discharge port is further arranged on the fine screen device. The fine screen device further plays a role of filtering and screening, smaller solid phase substances are trapped 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 slurry 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 preparing building materials.

Preferably, the fine screen is disposed obliquely. The solid phase substances separated by the fine screen are finer, are easy to be adhered to the fine screen, and are not easy to be thoroughly discharged. The fine screen is obliquely arranged, and the fine solid matters in the slurry conveyed to the fine screen can be settled to the lowest part of the fine screen under the action of gravity, so that the fine solid matters are more concentrated and easier to discharge.

Preferably, the middle tank is fixed on the slurry storage tank. Therefore, the components of the mud purifying device are compactly arranged, the structure is more compact, and the occupied area of the mud purifying device is reduced.

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

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

step two, slurry configuration;

starting a main machine of the gas lift reverse circulation drilling machine, and loosening the stratum to generate a drilling hole;

inputting compressed air to a main machine of the gas lift reverse circulation drilling machine by an air compressor, conveying the compressed air along the inside of a drill rod, mixing the compressed air with slurry and drilling slag in the drill rod, and enabling the formed mixture of bubbles, slurry and drilling slag to flow to a mixture discharge pipe along the drill rod;

step five, the mixture is conveyed to a mud purifying device by a mixture discharging pipe, the mixture is purified and separated by the mud purifying device, and mud after purification and separation flows into a mud storage tank;

step six, mud in the slurry storage tank is drained back to the drilling hole through a mud return pipe;

and seventhly, utilizing the screened solid phase substances in situ in a construction site for filling construction channels or beam slab prefabricated sites.

By adopting the working method of the drilling pile forming construction system, not only can the slurry be recycled, but also the drilling slag generated by drilling can be fully utilized, so that the construction waste and the waste discharge problem derived from the construction waste are greatly reduced, the construction cost is greatly reduced, and the pollution to the environment is reduced.

The beneficial effects of the invention are as follows:

and the construction cost is reduced. By adopting the invention, the discharged slurry can be treated while construction is performed, so that the recycling of the slurry in the construction process is realized, and the slurry manufacturing cost is reduced; the separated drilling slag gravel in the slurry purification treatment process can be used for filling the pavement and the beam slab prefabricated site, so that outsourcing gravel is reduced; saving facilities, land and related personnel configuration for slurry outward transportation and innocent treatment. Therefore, the invention can greatly reduce the cost of the construction of the drilling pile.

Is more beneficial to environmental protection. In the invention, the slurry forms a closed circulation between the main machine of the gas lift reverse circulation drilling machine and the slurry purifying device, so that the leakage and loss of the slurry 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 part of the mud purifying apparatus according to the present invention.

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

Detailed Description

The invention will be further described with reference to specific embodiments in the drawings.

Example 1:

as shown in fig. 1 and 2, a bored pile construction system is used for construction of large-diameter and ultra-long pile foundations of a bridge crossing a river. The drilling pile forming construction system comprises a gas lift reverse circulation drilling machine main machine 1, wherein the gas lift reverse circulation drilling machine main machine 1 is connected with a mud purifying device 2, the output end of the mud purifying device 2 is connected with a mud return pipe 4, and the mud return pipe 4 is communicated into a drilling hole drilled by a drill rod 3 of the gas lift reverse circulation drilling machine main machine 1. The mud purifying device 2 comprises a mud storage tank 5, a coarse screen cylinder 6, a fine screen cylinder 7 and a middle storage tank 8, wherein 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 purifying 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 purifying 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 feeding port of a hydrocyclone 11 through a self-circulation pipe 10, a slurry pump 12 is arranged on the self-circulation pipe 10, a solid 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 a mud return pipe 4, and an output valve is arranged at an outlet of the middle storage tank 8. The coarse screen cylinder 6 comprises a coarse screen cylinder body and a coarse screen device, wherein the coarse screen cylinder body is welded and 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 mixture discharge pipe 9, and a coarse screen drilling slag discharge port is also 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 slurry 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 slag discharge port is also arranged on the fine screen device.

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

step one, building and installing a main machine 1 of a gas lift reverse circulation drilling machine and an air compressor 13 in place;

step two, slurry configuration;

starting a main machine 1 of the gas lift reverse circulation drilling machine, loosening a stratum, generating a drilling hole, driving a steel casing 18 into the drilling hole, placing a drill bit 14 of the main machine 1 of the gas lift reverse circulation drilling machine in the steel casing 18, and pouring configured slurry into the steel casing 18;

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 inside of the drill rod 3 and is mixed with slurry and drill slag in the drill rod 3, and the formed mixture of bubbles, slurry and drill slag flows to the mixture discharge pipe 9 along the drill rod 3;

step five, a mixture discharge pipe 9 conveys the mixture to a mud purifying device 2, the mixture is filtered by a coarse screen of a coarse screen cylinder 6, larger-particle drilling residues are trapped, the residual slurry containing smaller particles enters a slurry storage tank 5 through the coarse screen cylinder, the slurry is conveyed from the slurry storage tank 5 to a hydrocyclone 11 through a self-circulation pipe 10 by suction of a slurry pump 12, relatively coarse and heavy particulate matters are thrown to the inner wall of the hydrocyclone 11 and are discharged downwards by rotation together with formed concentrated liquid from a solid discharge port at a lower position, and the concentrated liquid enters a fine screen cylinder 7 for finer filtration; the relatively smaller upward swirling flow formed by the rotation of the particulate matters along with the liquid in the slurry is output from an overflow port at the higher position of the hydrocyclone 11, enters the middle storage tank 8 for accumulation, and the 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 finer sediment is filled in the storage tank 8 and is used as regenerated slurry to be drained back to a drilled hole through the slurry return pipe 4;

and seventhly, 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 in the construction site for filling a construction channel or a beam slab prefabricated site.

Example 2:

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

In the fifth step, the two coarse screen drums 6 may be used alternately, when the drill slag screened out from the coarse screen device of one coarse screen drum 6 is accumulated to a set amount, the reversing 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 is sunk, so that the slurry discharged from the drill pipe 3 is input into the other coarse screen drum 6 for filtering and screening through the drainage of the swing type drainage groove 15, and the coarse screen drum 6 which is stopped at this time discharges the screened drill slag by utilizing the time, and when the drill slag is discharged, the coarse screen device dumping cylinder is started to enable the coarse screen device to tilt in a tilting manner, and the screened drill slag is dumped out.

Claims (7)

1. The drilling 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 purifying device (2), the output end of the slurry purifying device (2) is connected with a slurry return pipe (4), 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), the slurry purifying 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 at the top of the slurry storage tank (5) and are respectively communicated with the slurry storage tank (5), the coarse screen cylinder (6) is the input end of the slurry purifying device (2), the middle storage tank (8) is the output end of the slurry purifying device (2), the 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-supporting device (10), the self-supporting device (10) is provided with a cyclone (12), the two cyclone (8) are connected with the slurry return pipe (7) in the cyclone (8), the cyclone (8) is connected with the slurry return pipe (8, the slurry return pipe (6) is connected with the slurry return pipe (8, swing type drainage grooves (15) and drainage groove supports (16) are arranged between the two coarse screen drums (6), two ends of each drainage groove support (16) are welded on the two coarse screen drums (6) respectively, the middle part of each swing type drainage groove (15) is hinged to each drainage groove support (16), two ends of each swing type drainage groove (15) correspond to the two coarse screen drums (6) respectively, and an oil cylinder (17) is connected between one end of each swing type drainage groove (15) and each drainage groove support (16).

2. Drilling pile construction system according to claim 1, characterized in that the coarse screen drum (6) comprises a coarse screen drum body and a coarse screen device, the coarse screen drum body is communicated with the slurry storage tank (5), the coarse screen device is arranged on the top of the coarse screen drum body and is connected with the drilling slag discharge pipe (9), and the coarse screen device is also provided with a coarse screen drilling slag discharge port.

3. A bored pile construction system according to claim 2, wherein said coarse screen is hinged to said coarse screen cylinder.

4. Drilling pile construction system according to claim 1, characterized in that 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 solid discharge port of the hydrocyclone (11), and the fine screen device is also provided with a fine screen drilling slag discharge port.

5. The bored pile construction system according to claim 4, wherein the fine screen is disposed obliquely.

6. Drilling pile construction system according to any one of claims 1-5, characterized in that the medium tank (8) is fixed to the slurry tank (5).

7. A method of operating a bored pile construction system according to any one of claims 1 to 6, characterised by comprising the steps of:

step one, positioning a main machine (1) of the gas lift reverse circulation drilling machine and an air compressor (13);

step two, slurry configuration;

starting a gas lift reverse circulation drilling machine main machine (1), and loosening the stratum to generate a drilling hole;

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 inside of the drill rod (3) and is mixed with slurry and drilling slag in the inside of the drill rod (3), and the formed mixture of bubbles, slurry and drilling slag flows to the drilling slag discharge pipe (9) along the drill rod (3);

step five, conveying the mixture to a mud purifying device (2) by a drilling slag discharge pipe (9), purifying and separating the mixture by the mud purifying device, and enabling the purified and separated mud to flow into a mud storage tank (5);

step six, mud in the mud storage tank (5) is drained back to the drilling hole through a mud return pipe (4);

and seventhly, utilizing the screened solid phase substances in situ in a construction site for filling construction channels or beam slab prefabricated sites.

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