1. A hole cleaning device for a cast-in-situ bored pile comprises an air compressor and a slurry pump, and is characterized by further comprising a gas transmission pipe (1), a hole cleaning pipe (2), a gas transmission ring (3) and a gas nozzle (4), wherein the gas transmission pipe (1) is connected with the air compressor, and the hole cleaning pipe (2) is connected with the slurry pump; the gas transmission ring (3) is fixedly arranged at the bottom end of the hole cleaning pipe (2) and is connected with the bottom end of the gas transmission pipe (1); the gas transmission ring (3) is of a hollow annular structure, the gas nozzles (4) are uniformly distributed and fixedly mounted on the inner wall of the gas transmission ring (3), and the gas nozzles (4) face to the inclined lower side.

2. The cast-in-situ bored pile hole cleaning device according to claim 1, further comprising a flow guide cover (5), wherein the flow guide cover (5) is fixedly installed at the upper end of the hole cleaning pipe (2), and the gas pipe (1) is fixedly installed at the edges of the flow guide cover (5) and the hole cleaning pipe (2).

3. A cast-in-situ bored pile hole cleaning device according to claim 2, further comprising a mud pipe (6), wherein the mud pipe (6) is fixedly inserted into the air guide sleeve (5), and the mud pump is connected to the mud pipe (6).

4. A cast-in-situ bored pile hole cleaning device according to claim 1, further comprising a check valve (7), wherein the check valve (7) is fixedly installed on the inner wall of the gas transmission ring (3) and connected with one end of the gas nozzle (4).

5. A cast-in-situ bored pile hole cleaning device according to claim 4, wherein said one-way valve (7) comprises a valve body (71) and a valve (72), said valve (72) being fixedly mounted in the valve body (71).

6. A cast-in-situ bored pile hole cleaning device according to claim 5, wherein the number of said valves (72) is at least two pieces.

7. A cast-in-situ bored pile hole cleaning device according to claim 5, wherein the shape of the valve (72) is a sector, and the sum of the areas of the valves (72) is larger than the cross-sectional area of the valve body (71); and a gap is reserved between the adjacent valves (72), and the edges of the adjacent valves (72) can be attached to or separated from each other, so that the one-way valve (7) is opened or closed.

8. A cast-in-situ bored pile hole cleaning apparatus according to claim 1, wherein the number of the air nozzles (4) is four.

9. A cast-in-situ bored pile hole cleaning device according to claim 1, wherein the angle between the axis of the air nozzle (4) and the horizontal line is 60 degrees.

10. A cast-in-situ bored pile hole cleaning method, which is performed by using the cast-in-situ bored pile hole cleaning device as claimed in any one of claims 1 to 9 as a tool, and comprises the following steps:

s1: placing the hole cleaning device into a pile hole of the cast-in-situ bored pile, wherein the distance between the gas transmission ring (3) and the bottom of the pile hole is 10-20cm, and sealing a gap between the top end of the pile hole and the hole cleaning device;

s2: connecting a gas pipe (1) with an air compressor, connecting a slurry pipe (6) with a slurry pump, and checking the tightness of the pipeline;

s3: the air compressor and the slurry pump are started, air enters the air conveying pipe (1), is distributed by the air conveying ring (3) and then is sprayed out of the air spraying head (4);

s4: gas is sprayed out of the inside of the hole cleaning pipe (2) and the lower part of the hole cleaning pipe (2) to disturb the sediments at the bottom of the pile hole, so that the sediments are promoted to enter the hole cleaning pipe (2) to form a gas-solid-liquid mixture with the slurry in the hole cleaning pipe (2), and the gas-solid-liquid mixture rises along the hole cleaning pipe (2) and is discharged through the slurry pipe (6);

s5: and after hole cleaning is finished, the air compressor and the mud pump are closed, and the hole cleaning device is taken out from the pile hole.

Background

During the hole forming construction process of the cast-in-situ bored pile, a large amount of drilling slag is generated at the bottom of the pile hole, the drilling speed of the pile machine is seriously influenced if the drilling slag is not timely removed, and the quality of the cast-in-situ bored pile is directly influenced if excessive drilling slag is deposited at the bottom of the pile hole. In an actual construction process, hole cleaning equipment is generally used for cleaning a pile hole of a cast-in-place pile so as to remove drilling slag at the bottom of the pile hole. The hole cleaning equipment in the prior art adopts a reverse circulation process to clean the hole of the cast-in-place pile, and simultaneously carries out gas transmission on the reflowing slurry through the gas transmission metal pipe, so that a gas-liquid mixture is formed by utilizing bubbles and liquid to increase the reflowing effect. However, the sediment at the bottom of the pile hole is in a relatively stable state, and when the sediment at the bottom of the pile hole is reflowed, the sediment at the bottom of the pile hole can be deposited, so that the hole cleaning effect is influenced.

Disclosure of Invention

Therefore, the technical problem to be solved by the present invention is to overcome the above-mentioned defects in the prior art, and to provide a cast-in-situ bored pile hole cleaning apparatus and method.

Therefore, the cast-in-situ bored pile hole cleaning device disclosed by the invention comprises an air compressor, a slurry pump, a gas transmission pipe, a hole cleaning pipe, a gas transmission ring and a gas nozzle, wherein the gas transmission pipe is connected with the air compressor, and the hole cleaning pipe is connected with the slurry pump; the gas transmission ring is fixedly arranged at the bottom end of the hole cleaning pipe and is connected with the bottom end of the gas transmission pipe; the gas transmission ring is of a hollow annular structure, the plurality of gas nozzles are uniformly distributed and fixedly installed on the inner wall of the gas transmission ring, and the gas nozzles face obliquely below.

Preferably, the air guide sleeve is further included, the air guide sleeve is fixedly installed at the upper end of the hole cleaning pipe, and the air conveying pipe is fixedly installed on the air guide sleeve and the edge of the hole cleaning pipe.

Preferably, the slurry pump further comprises a slurry pipe, the slurry pipe is fixedly inserted on the air guide sleeve, and the slurry pump is connected with the slurry pipe.

Preferably, the gas injection device further comprises a one-way valve, wherein the one-way valve is fixedly arranged on the inner wall of the gas transmission ring and is connected with one end of the gas injection head.

Preferably, the one-way valve comprises a valve body and a valve, and the valve is fixedly installed in the valve body.

Preferably, the number of valves is at least two.

Preferably, the valve is in a fan shape, and the sum of the areas of the valve membranes is larger than the cross-sectional area of the valve body; and a gap is reserved between the adjacent valves, and the edges of the adjacent valves can be attached to or separated from each other, so that the one-way valve is opened or closed.

Preferably, the number of the showerhead is four.

Preferably, the showerhead axis is at a 60 degree angle from horizontal.

The invention also discloses a cast-in-situ bored pile hole cleaning method, which is carried out by using the cast-in-situ bored pile hole cleaning device as a tool and comprises the following steps:

s1: placing the hole cleaning device into a pile hole of the cast-in-situ bored pile, wherein the distance between the gas transmission ring and the bottom of the pile hole is 10-20cm, and sealing a gap between the top end of the pile hole and the hole cleaning device;

s2: connecting a gas pipe with an air compressor, connecting a slurry pipe with a slurry pump, and checking the tightness of the pipeline;

s3: the air compressor and the slurry pump are started, and the air enters the air transmission pipe and is distributed by the air transmission ring and then is sprayed out of the air spraying head;

s4: gas is sprayed out of the hole cleaning pipe and below the hole cleaning pipe to disturb sediment at the bottom of the pile hole, so that the sediment enters the hole cleaning pipe, forms a gas-solid-liquid mixture with slurry in the hole cleaning pipe, rises along the hole cleaning pipe and is discharged through the slurry pipe;

s5: and after hole cleaning is finished, the air compressor and the mud pump are closed, and the hole cleaning device is taken out from the pile hole.

According to the cast-in-situ bored pile hole cleaning device and method provided by the invention, the gas transmission ring is subjected to gas transmission through the gas transmission pipe, then the gas is sprayed out from the gas spraying head after being distributed by the gas transmission ring, and the gas is sprayed out into the hole cleaning pipe and below the hole cleaning pipe due to the fact that the gas spraying head is inclined downwards, so that the gas is mixed with slurry, meanwhile, the downwards sprayed gas disturbs sediments at the bottom of the pile hole body, and the sediments are promoted to enter the hole cleaning pipe, so that the sediment at the bottom of the pile hole can be prevented from being deposited to influence the hole cleaning effect.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic structural diagram of a cast-in-situ bored pile hole cleaning device provided by the present invention;

FIG. 2 is a cross-sectional view of the bottom end of a hole cleaning tube provided by the present invention;

FIG. 3 is a cross-sectional view of a one-way valve provided by the present invention;

fig. 4 is a bottom view of the gas delivery ring provided by the present invention.

Reference numerals: 1. a gas delivery pipe; 2. cleaning a hole pipe; 3. a gas delivery ring; 4. a gas showerhead; 5. a pod; 6. a mud pipe; 7. a one-way valve; 71. a valve body; 72. and (4) a valve.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

Example 1

As shown in fig. 1 to 4, the present embodiment provides a hole cleaning device for a bored pile, which includes an air compressor and a slurry pump, and further includes an air pipe 1, a hole cleaning pipe 2, an air ring 3, a jet head 4, a diversion cover 5, a slurry pipe 6 and a one-way valve 7, wherein the air pipe 1 is connected with the air compressor, and the hole cleaning pipe 2 is connected with the slurry pump. The air guide sleeve 5 is fixedly arranged at the upper end of the hole cleaning pipe 2, and the gas pipe 1 is fixedly arranged at the edges of the air guide sleeve 5 and the hole cleaning pipe 2. The mud pipe 6 is fixedly inserted on the air guide sleeve 5, and the mud pump is connected with the mud pipe 6. The gas transmission ring 3 is fixedly arranged at the bottom end of the clear hole pipe 2 and is connected with the bottom end of the gas transmission pipe 1; the gas transmission ring 3 is a hollow annular structure, a plurality of gas nozzles 4 are uniformly distributed and fixedly installed on the inner wall of the gas transmission ring 3, and the gas nozzles 4 face obliquely below. The number of the air nozzles 4 is four, and the included angle between the axis of the air nozzle 4 and the horizontal line is 60 degrees. The one-way valve 7 is fixedly arranged on the inner wall of the gas transmission ring 3 and is connected with one end of the gas nozzle 4. The one-way valve 7 comprises a valve body 71 and a valve 72, wherein the valve 72 is fixedly arranged in the valve body 71; the number of the valves 72 is at least two, the valves 72 are fan-shaped, and the sum of the areas of the valves 72 is larger than the cross-sectional area of the valve body 71; there is a gap between adjacent valves 72, and the edges of adjacent valves 72 can be attached to or detached from each other, so that the check valve 7 can be opened or closed.

In this embodiment, the air guide sleeve 5 functions to fix the air delivery pipe 1 and the mud pipe 6. Carry out the gas transmission through gas-supply pipe 1 to gas transmission ring 3, and then gaseous from jet head 4 blowout behind the 3 distributions of gas transmission ring, because jet head 4 is oblique below, and then gaseous in to clear hole pipe 2 with clear hole pipe 2 below blowout, and then gaseous and slurry mixing, simultaneously, the gaseous sediment to pile hole body bottom of down blowout is disturbed, impels the sediment to enter into clear hole pipe 2 in, thereby can avoid pile hole bottom sediment to take place the deposit, influence clear hole effect. The valves 72 are elastic taper structures protruding to the gas injection head 4 side, when gas enters the gas injection head 4 from the gas delivery ring 3, the edges of the adjacent valves 72 are separated, the check valve 7 is opened, the gas can be injected from the gas injection head 4, when the gas enters the gas delivery ring 3 from the gas injection head 4, the edges of the adjacent valves 72 are tightly attached, the check valve 7 is closed, and the slurry can be prevented from flowing back to the gas delivery ring 3.

Example 2

The embodiment provides a cast-in-situ bored pile hole cleaning method, which is carried out by using the cast-in-situ bored pile hole cleaning device as a tool and comprises the following steps:

s1: placing the hole cleaning device into a pile hole of the cast-in-situ bored pile, wherein the distance between the gas transmission ring 3 and the bottom of the pile hole is 10-20cm, and sealing a gap between the top end of the pile hole and the hole cleaning device;

s2: connecting the gas transmission pipe 1 with an air compressor, connecting the slurry pipe 6 with a slurry pump, and checking the tightness of the pipeline;

s3: an air compressor and a slurry pump are started, air enters the air transmission pipe 1 and is distributed by the air transmission ring 3 and then is sprayed out of the air spraying head 4;

s4: gas is sprayed out of the hole cleaning pipe 2 and below the hole cleaning pipe 2 to disturb the sediment at the bottom of the pile hole, so that the sediment enters the hole cleaning pipe 2 to form a gas-solid-liquid mixture with the slurry in the hole cleaning pipe 2, rises along the hole cleaning pipe 2 and is discharged through the slurry pipe 6;

s5: and after hole cleaning is finished, the air compressor and the mud pump are closed, and the hole cleaning device is taken out from the pile hole.

In this embodiment, through the clearance between the sealed stake hole top and the clear hole device, can ensure that gaseous from clear hole pipe 2 blowout back, can disturb the sediment of stake hole bottom, make the sediment enter into clear hole pipe 2 in, avoid taking place the deposit bottom the stake hole. Carry out the gas transmission through gas-supply pipe 1 to gas transmission ring 3, and then gaseous from jet head 4 blowout behind the 3 distributions of gas transmission ring, because jet head 4 is oblique downwards, and then gaseous in to clear hole pipe 2 with clear hole pipe 2 below blowout, and disturb the sediment of stake hole bottom, make the sediment enter into clear hole pipe 2 in, thereby the hole bottom sediment of having solved stake hole bottom is in relatively stable state, when the backward flow, the deposit can take place for the sediment of stake hole bottom, the problem of clear hole effect is influenced.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.