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

Abstract

The invention discloses a drilling and piling construction system, which comprises a main engine of a gas lift reverse circulation drilling rig, the main engine of the gas lift reverse circulation drilling rig is connected with a mud purification device, the output end of the mud purification device is connected with a mud return pipe, and the mud return pipe is connected to In the borehole drilled by the drill pipe of the main engine of the gas lift reverse circulation drilling rig. The invention also discloses the working method of the drilling and piling construction system. By adopting the present invention, the discharged mud can be processed while constructing, realizing the recycling of mud during the construction process, and reducing the cost of making mud; the drill slag and gravel separated during the mud purification process can be used for filling the sidewalk and beam-slab prefabricated site, Reduce the purchase of sand and gravel; save the facilities, land and related staffing for mud transportation and harmless treatment. Therefore, the present invention can greatly reduce the cost of drilling and pile construction, and reduce environmental pollution.

Description

A drilling system and working method thereof

technical field

The invention relates to a building construction equipment and its working method, more specifically, it relates to a drilling and piling construction system and its working method.

Background technique

Air-lift reverse circulation drilling rigs are often used in the construction of large-diameter and super-long pile foundations of cross-river bridges. During the working process of the air-lift reverse circulation drilling rig, mud is continuously poured into the boreholes generated by the drill bits of the drilling rig, and the compressed air is pumped through the air compressor at the same time. Through the inside of the drill pipe, a mixture of air bubbles and mud slag is formed in the inner cavity of the drill pipe, and its density is lower than that of the mud outside the drill pipe. Under the action of the liquid column and atmospheric pressure in the borehole, the mud between the borehole wall and the drill pipe flows to the bottom of the hole, and the drill slag cut by the drill bit is brought into the inner cavity of the drill pipe, and the light formed by the drill slag, mud and compressed air The gas bubble liquid is discharged through the drill pipe and the slurry discharge pipe under the action of pressure difference. In the current construction technology using gas-lift reverse circulation drilling rigs, the mud needs to be specially configured and poured continuously. However, the mud discharged from the drill pipe cannot be used because it contains a large amount of drilling slag, so it can only be discharged separately and followed up. Treatment. The transportation and treatment of the discharged mud requires a large number of facilities and sites, and a lot of labor is required, which greatly increases the construction cost, and the transportation and treatment of the mud will also cause some pollution to the environment. The invention patent with the publication number CN108060893A disclosed a construction method of a gas-lift reverse circulation drilling rig on May 22, 2018, which includes two steps of initial drilling and normal drilling. The initial drilling control makes the drilling smoother. During the normal drilling process, the soil samples in the borehole are taken, and the mud with different properties is selected under different geological conditions to ensure the quality of the hole wall under different geological conditions. But this invention does not have big difference with conventional technology on the operating method of pouring mud, does not propose corresponding solution for the processing problem of discharging mud.

Contents of the invention

In the current construction technology using gas-lift reverse circulation drilling rigs, the mud discharged from the drill pipe is not recycled and can only be discharged and followed up, which greatly increases the construction cost and causes some pollution to the environment. In order to overcome these Disadvantage, the present invention provides a drilling and piling construction system and its working method, which can process and reuse the mud discharged from the drill pipe on site, reduce construction costs, and reduce environmental pollution.

The technical solution of the present invention is: a drilling and piling construction system, comprising a main engine of a gas-lift reverse circulation drilling rig, the main engine of the air-lift reverse circulation drilling rig is connected with a mud purification device, the output end of the mud purification device is connected with a mud return pipe, and the mud return flow The pipe leads to the borehole drilled by the drill pipe of the main engine of the gas lift reverse circulation drilling rig. The mud discharged from the drill pipe is drained through the pipeline to the mud purification device when the main engine of the gas lift reverse circulation drilling rig is running. The purification device flows back into the borehole through the mud return pipe, so that the mud can be recycled, and there is no need for special continuous configuration of mud and continuous injection, which can not only greatly reduce the amount of mud, but also the discharged mud does not need to be transported long-distance and harmless. It can save a large number of facilities and sites as well as related staffing, thereby greatly reducing construction costs. In addition, since the mud forms a closed cycle between the main engine of the gas lift reverse circulation drilling rig and the mud purification device, the leakage and loss of mud are greatly reduced, and the pollution to the environment is reduced.

As preferably, the mud purification device includes a slurry storage tank, a coarse screen drum, a fine screen drum and a middle storage tank, the coarse screen drum and the fine screen drum are connected to the top of the slurry storage tank and communicated with the slurry storage tank respectively, and the coarse screen drum is used for mud purification. The input end of the device, the middle storage tank is the output end of the mud purification device, the inner cavity of the drill pipe is connected with the coarse screen cylinder through the mixture discharge pipe, the slurry storage tank is connected with a hydrocyclone through the self-circulation pipe, and the self-circulation pipe is equipped with There is a slurry pump, the solid discharge port of the hydrocyclone is connected with the fine screen cylinder, the overflow port of the hydrocyclone is connected with the middle storage tank, and the middle storage tank is connected with the mud return pipe. The mud discharged from the drill pipe is firstly filtered through the coarse screen cylinder to retain the larger particles of drilling slag, and the remaining slurry containing smaller particles enters the slurry storage tank through the coarse screen cylinder, and then is pumped by the slurry pump The slurry storage tank is transported to the hydrocyclone through a self-circulating pipe. The hydrocyclone can separate and remove the heavier coarse-grained mud and sand in the sewage. The relatively coarse and heavy particulate matter is thrown to the inner wall of the hydrocyclone and rotates downward, and the formed thick liquid is discharged from the lower solid discharge port together, and enters the fine The sieve cylinder is used for finer filtration; while the relatively small particulate matter rotates to a certain extent and forms an upward vortex flow with the rotation of the liquid in the mud, which is output from the overflow port at the higher part of the hydrocyclone and enters the middle storage tank for accumulation. , the medium storage tank is the slurry containing finer sand and returns to the borehole from the mud return pipe as recycled mud. After the purification treatment of the mud purification device, the large particles of drilling slag are effectively separated, and the remaining slurry containing finer sand has good fluidity and density, which can meet the construction requirements of injection drilling, so that it can be circulated repeatedly Utilization, and the separated solid phase drilling slag can also be used as an auxiliary material on site, without the need for external transportation.

As preferably, the coarse screen cylinder includes a coarse screen cylinder body and a coarse screen device, the coarse screen cylinder body communicates with the slurry storage tank, the coarse screen device is installed on 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 Coarse screening drilling slag outlet. The coarse sieve acts as a filter and sieve, intercepting larger solid phase substances and passing liquid phase substances and smaller solid phase substances. The coarse sieve cylinder provides an installation platform and a closed filtered mud delivery channel for the coarse sieve device. The large particle slag separated by the coarse screen can be discharged and collected from the sieve slag outlet, and used for prefabricated site filling or filling of access roads.

As a preference, there are two coarse screen cylinders, and a swing type drainage groove and a drainage groove bracket are arranged between the two coarse screen cylinders. The two ends of the drainage groove bracket are respectively welded on the two coarse screen cylinders. On the groove support, the two ends of the swing type drainage groove correspond to two coarse screen cylinders respectively, and an oil cylinder is connected between one end of the swing type drainage groove and the drainage groove support. The coarse screen cylinder is the input end of the mud purification device, and the retained large particles of solid-phase substances need to be cleaned up in time to avoid blocking the coarse screen device, causing restrictions on mud circulation and affecting construction efficiency. The two coarse screen cylinders can be used alternately. The inclination direction of the oscillating drainage groove can be changed through the state switching of the oil cylinder, and then the coarse screen cylinder is selected to receive the mud discharged from the drill pipe, while the unselected coarse screen cylinder takes advantage of this time Clean up the sieved large particles of solid phase substances in time.

Preferably, the coarse screen is hinged on the coarse screen cylinder. The coarse sieve can be turned over and tilted. When discharging the solid phase material sieved by the coarse sieve, it only needs to be turned around the hinge point, and the sieved solid can be poured out.

Preferably, the fine screen cylinder includes a fine screen cylinder body and a fine screen device, the fine screen cylinder body communicates with the slurry storage tank, the fine screen device is installed on the top of the fine screen cylinder body and is connected with the solid discharge port of the hydrocyclone, and the fine screen There is also a discharge port for fine sieve drilling slag on the device. The fine sieve acts as a further filter and sieve, retaining smaller solid-phase substances and passing through liquid-phase substances and smaller solid-phase substances. The fine sieve cylinder provides an installation platform for the fine sieve and closed filtered mud transportation aisle. The small particles of drilling slag separated by the fine sieve can be discharged and collected from the sieve drilling slag discharge port, which is used to assist in the preparation of building materials.

Preferably, the fine sieve is arranged obliquely. The solid phase material separated by the fine sieve is relatively fine, and it is easy to adhere to the fine sieve, and it is difficult to discharge completely. The fine sieve is set at an inclination, and the fine solid matter in the slurry conveyed to the fine sieve will settle to the lowest point of the fine sieve under the action of gravity, so that the fine solid matter is more concentrated and easier to discharge.

Preferably, the middle storage tank is fixed on the slurry storage tank. In this way, the various components of the mud purification device can be arranged more closely, the structure is more compact, and the floor space of the mud purification device can be reduced.

The working method of the described drilling and piling construction system comprises the following steps:

Step 1. Air lift reverse circulation drilling rig host and air compressor are in place;

Step 2. Mud configuration;

Step 3. Start the main engine of the gas lift reverse circulation drilling rig to loosen the formation and generate a borehole;

Step 4. The air compressor inputs compressed air to the air lift reverse circulation drilling rig host, the compressed air is transported along the inside of the drill pipe, and mixed with mud and drilling slag inside the drill pipe, and the formed mixture of air bubbles, mud and drilling slag travels along the drill pipe flow to the mixture discharge pipe;

Step 5. The mixture discharge pipe transports the mixture to the mud purification device, and the mud purification device purifies and separates the mixture, and the purified and separated mud flows into the slurry storage tank;

Step 6. The mud in the mud storage tank is drained back to the borehole through the mud return pipe;

Step 7. The sieved solid-phase substances are used on site at the construction site for filling construction access roads or beam-slab prefabricated sites.

Using the working method of this drilling and piling construction system can not only recycle mud, but also make full use of the drilling slag generated by drilling, greatly reducing construction waste and the resulting waste discharge problems, and greatly reducing construction costs , to reduce environmental pollution.

The beneficial effects of the present invention are:

Reduce construction costs. By adopting the present invention, the discharged mud can be processed while constructing, realizing recycling of the mud during the construction process, and reducing the cost of making mud; the drill slag and gravel separated during the mud purification process can be used for filling the sidewalk and beam and slab prefabricated sites, Reduce the purchase of sand and gravel; save the facilities, land and related staffing for mud transportation and harmless treatment. Therefore, the present invention can greatly reduce the cost of drilling into piles.

More conducive to environmental protection. In the present invention, since the mud forms a closed cycle between the main engine of the gas-lift reverse circulation drilling rig and the mud purification device, the leakage and loss of mud are greatly reduced, and the pollution to the environment is reduced.

Description of drawings

Fig. 1 is a kind of structural representation of applying the present invention;

Fig. 2 is a kind of system layout schematic diagram of the present invention;

Fig. 3 is a partial structural schematic diagram of the mud purification device in the present invention.

In the figure, 1- air lift reverse circulation drilling rig main engine, 2- mud purification device, 3- drill pipe, 4- mud return pipe, 5- mud storage tank, 6- coarse screen drum, 7- fine screen drum, 8- medium Storage tank, 9-mixture discharge pipe, 10-self-circulation pipe, 11-hydrocyclone, 12-slurry pump, 13-air compressor, 14-drill, 15-swing drainage tank, 16-drainage tank bracket , 17-reversing oil cylinder, 18-steel casing.

Detailed ways

The present invention will be further described below in conjunction with the specific embodiments of the accompanying drawings.

Example 1:

As shown in Figure 1 and Figure 2, a drilled pile construction system is used for the construction of large-diameter and super-long pile foundations for bridges across rivers. The drilling and piling construction system includes a gas-lift reverse circulation drilling rig host 1, which is connected to a mud purification device 2, and the output end of the mud purification device 2 is connected to a mud return pipe 4, and the mud return pipe 4 is connected to In the borehole that the drill pipe 3 of the gas lift reverse circulation drilling rig main frame 1 drills out. The mud purification device 2 comprises a slurry storage tank 5, a coarse screen drum 6, a fine screen drum 7 and a middle storage tank 8, the coarse screen drum 6 and the fine screen drum 7 are connected to the top of the slurry storage tank 5 and communicated with the slurry storage tank 5 respectively, The coarse screen cylinder 6 is the input end of the mud purification device 2, the middle storage tank 8 is fixed on the slurry storage tank 5, the middle storage tank 8 is the output end of the mud purification device 2, and the inner cavity of the drill pipe 3 passes through the mixture discharge pipe 9 and the coarse The sieve drum 6 is connected, the slurry storage tank 5 is connected with the feed port of a hydrocyclone 11 through the self-circulation pipe 10, the self-circulation pipe 10 is provided with a slurry pump 12, the solid discharge port of the hydrocyclone 11 is connected with the fine The screen cylinder 7 is connected, the overflow port of the hydrocyclone 11 is connected with the middle storage tank 8, the middle storage tank 8 is connected with the mud return pipe 4, and the outlet of the middle storage tank 8 is provided with an output valve. The coarse screen cylinder 6 includes a coarse screen cylinder body and a coarse screen device. The coarse screen cylinder body is welded and communicated with the slurry storage tank 5. The coarse screen device is installed on the top of the coarse screen cylinder body and connected with the mixture discharge pipe 9. There is also a coarse screen device on the coarse screen device. Equipped with coarse screen drilling slag discharge outlet. The fine screen cylinder 7 includes 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, and the fine screen device is obliquely installed on the top of the fine screen cylinder body and connected with the solid discharge port of the hydrocyclone 11 , The fine sieve device is also equipped with a fine sieve slag discharge port.

The working method of the described drilling and piling construction system comprises the following steps:

Step 1. Air lift reverse circulation drilling rig host 1 and air compressor 13 are built and installed in place;

Step 2. Mud configuration;

Step 3. Start the main engine 1 of the air-lift reverse circulation drilling rig, loosen the formation, generate a borehole, and drive a steel casing 18 into the borehole, the drill bit 14 of the main engine 1 of the air-lift reverse circulation drilling rig is in the steel casing 18, The configured mud is poured into the steel casing 18;

Step 4. The air compressor 13 inputs the compressed air to the main engine 1 of the gas lift reverse circulation drilling rig, and the compressed air is conveyed along the inside of the drill pipe 3, and mixed with the mud and drilling slag inside the drill pipe 3 to form a mixture of air bubbles, mud and drilling slag Flow along the drill pipe 3 to the mixture discharge pipe 9;

Step 5. The mixture discharge pipe 9 transports the mixture to the mud purification device 2, and first passes through the coarse sieve device of the coarse screen drum 6 to filter the drill slag with larger particles, and the remaining slurry containing smaller particles passes through the coarse sieve. The screen cylinder enters the slurry storage tank 5, and then is pumped by the slurry pump 12 from the slurry storage tank 5 to the hydrocyclone 11 through the self-circulation pipe 10, and the relatively coarse and heavy particulate matter is thrown to the inner wall of the hydrocyclone 11 And rotate downward and the formed concentrated liquid is discharged from the lower solid discharge port together, and enters the fine screen drum 7 for finer filtration; the relatively small particulate matter rotates with the liquid in the mud to form an upward vortex flow from the hydrocyclone The overflow port output at the higher part of flow device 11 enters the middle storage tank 8 for accumulation, and the output valve of the middle storage tank 8 is temporarily closed for five minutes and then opened again, so that the mud in the middle storage tank 8 forms a sufficient amount of savings to ensure continuous output;

Step 6. In the middle storage tank 8, the slurry containing finer silt is used as recycled mud and drained back to the borehole through the mud return pipe 4;

Step 7. The gravel and fine sand obtained after screening are transported to the construction site by the loader, and used on the construction site for filling the construction access road or the prefabricated site of beams and slabs.

Example 2:

As shown in Figure 3, there are two coarse screen cylinders 6, and a swing type drainage groove 15 and a drainage groove bracket 16 are arranged between the two coarse screen cylinders 6, and the two ends of the drainage groove bracket 16 are respectively welded on the two coarse screen cylinders 6, The middle part of the swing-type drainage groove 15 is hinged on the drainage groove bracket 16, and the two ends of the swing-type drainage groove 15 correspond to two coarse screen cylinders 6 respectively, and one end of the swing-type drainage groove 15 is connected with the drainage groove bracket 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 swinging type drainage groove 15. The coarse sieve is hinged on the coarse sieve cylinder, and a coarse sieve dumping oil cylinder is connected between the free end of the coarse sieve and the coarse sieve cylinder. The actions of reversing oil cylinder 17 and coarse screen device dumping oil cylinder are all controlled by operating handle, and all the other are with embodiment 1.

In step 5, the two coarse screen cylinders 6 can be used alternately. When the drill slag screened out on the coarse screen of one coarse screen cylinder 6 accumulates to a set amount, the reversing oil cylinder 17 is started to change the position of the swing type drainage groove 15. In the direction of inclination, one end of the swinging drainage groove 15 corresponding to the other coarse screen drum 6 sinks, so that the mud discharged from the drill pipe 3 is input into the other coarse screen drum 6 through the drainage of the swinging drainage groove 15 for filtering and screening, while The coarse sieve drum 6 that stops now utilizes this time to discharge the sieved drilling slag, and when discharging the sieved drilling slag, the coarse sieve device dumps the oil cylinder and starts to make the coarse sieve device overturn and tilt, and the sieved drilling slag is dumped out.

Claims (7)

1. A drilling and piling construction system, comprising a gas-lift reverse circulation drilling rig host (1), characterized in that the gas lift reverse circulation drilling rig host (1) is connected to a mud purification device (2), and the mud purification device (2) The output end is connected with a mud return pipe (4), and the mud return pipe (4) is connected to the drill hole drilled by the drill pipe (3) of the gas lift reverse circulation drilling rig main unit (1), and the mud purification device (2) includes a mud storage Groove (5), coarse screen drum (6), fine screen drum (7) and medium storage tank (8), coarse screen drum (6) and fine screen drum (7) are connected to the top of slurry storage tank (5) and respectively Connected with the slurry storage tank (5), the coarse screen cylinder (6) is the input end of the mud purification device (2), the middle storage tank (8) is the output end of the mud purification device (2), and the inner cavity of the drill pipe (3) The slag discharge pipe (9) is connected to the coarse screen cylinder (6), the slurry storage tank (5) is connected to a hydrocyclone (11) through the self-circulation pipe (10), and the self-circulation pipe (10) is equipped with The slurry pump (12), the solid discharge port of the hydrocyclone (11) is connected to the fine screen drum (7), the overflow port of the hydrocyclone (11) is connected to the middle storage tank (8), and the middle storage tank (8) Connected with the mud return pipe (4), there are two coarse screen drums (6), and a swinging drainage groove (15) and a drainage groove bracket (16) are arranged between the two coarse screen drums (6). The two ends of the bracket (16) are respectively welded on the two coarse screen cylinders (6), the middle part of the swing type drainage groove (15) is hinged on the drainage groove bracket (16), and the two ends of the swing type drainage groove (15) correspond to the two coarse screen cylinders (6) respectively. The sieve drum (6), an oil cylinder (17) is connected between one end of the swing type drainage groove (15) and the drainage groove support (16). 2. The drilling and piling construction system according to claim 1, characterized in that the coarse screen cylinder (6) includes a coarse screen cylinder and a coarse screen device, the coarse screen cylinder communicates with the slurry storage tank (5), and the coarse screen The device is installed on the top of the coarse screen cylinder and is connected with the drill slag discharge pipe (9). The coarse screen device is also provided with a coarse screen drill slag discharge port. 3. The drilling and piling construction system according to claim 2, characterized in that the coarse screen is hinged on the coarse screen cylinder. 4. The drilling and piling construction system according to claim 1, characterized in that the fine sieve cylinder (7) includes a fine sieve cylinder and a fine sieve device, the fine sieve cylinder communicates with the slurry storage tank (5), and the fine sieve The device is installed on the top of the fine screen cylinder and connected with the solid discharge port of the hydrocyclone (11), and the fine screen device is also equipped with a fine screen drilling slag discharge port. 5. The drilling and piling construction system according to claim 4, characterized in that the fine screen is arranged obliquely. 6. The drilling and piling construction system according to any one of claims 1 to 5, characterized in that the middle storage tank (8) is fixed on the slurry storage tank (5). 7. The working method of the bored pile construction system according to any one of claims 1 to 6, characterized in that it comprises the following steps: Step 1. Air lift reverse circulation drilling rig host (1) and air compressor (13) are in place; Step 2. Mud configuration; Step 3. Start the main engine (1) of the air lift reverse circulation drilling rig to loosen the formation and generate a borehole; Step 4. The air compressor (13) inputs the compressed air to the main unit (1) of the gas lift reverse circulation drilling rig, and the compressed air is conveyed along the inside of the drill pipe (3), and mixed with mud and drilling slag inside the drill pipe (3) to form The mixture of air bubbles, mud and drilling slag flows along the drill pipe (3) to the drilling slag discharge pipe (9); Step 5. Drilling slag discharge pipe (9) transports the mixture to the mud purification device (2), and the mud purification device purifies and separates the mixture, and the purified and separated mud flows into the slurry storage tank (5); Step 6. The mud in the mud storage tank (5) is drained back to the drill hole through the mud return pipe (4); Step 7. The sieved solid-phase substances are used on site at the construction site for filling construction access roads or beam-slab prefabricated sites.

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