CN111236234A - Hole cleaning system and hole cleaning method for cast-in-place pile - Google Patents

Abstract

The invention provides a hole cleaning system and a hole cleaning method of a cast-in-place pile, which belong to the field of hole cleaning construction of the cast-in-place pile, and comprise a crane assembly, an air compressor, a high-pressure air pipe and a slag cleaning barrel for a primary hole cleaning process, wherein the crane assembly lifts the slag cleaning barrel to the bottom of a pile hole provided with a sleeve, a gap is formed between the slag cleaning barrel and the bottom of the pile hole, the air compressor outputs high-pressure air to the gap through the high-pressure air pipe, and sediment at the bottom of the pile hole is mixed with the high-pressure air, then ascends along the gap between the slag cleaning barrel and the sleeve and enters the slag cleaning barrel from the top end of the slag cleaning barrel; the problems that on-site mud gas lift reverse circulation hole cleaning operation in a sleeve is required to be achieved, circulating pipelines are extremely difficult to arrange, a mud pit, an air compressor, the circulating pipelines and the like need to be arranged, on-site installation time is long, and construction efficiency is greatly influenced due to the fact that a large crane is used for assisting operation are solved.

Description

Hole cleaning system and hole cleaning method for cast-in-place pile

Technical Field

The invention relates to the field of hole cleaning construction of cast-in-place piles, in particular to a hole cleaning system and a hole cleaning method of a cast-in-place pile.

Background

The full-casing full-slewing drilling machine is full-casing construction equipment capable of driving a casing to rotate for 360 degrees, and is increasingly widely applied to cast-in-place pile construction under complex stratum conditions. The construction process mainly comprises the following steps: the friction between a steel sleeve and a soil layer is greatly reduced by utilizing a slewing device of a full-casing full-slewing drilling machine, the steel sleeve and the soil layer are pressed in while slewing, and meanwhile, a grab bucket is utilized to dig and take soil until the casing is sunk to a pile end bearing layer; after the hole is formed by excavation, confirming the hole depth and the bearing stratum, and removing the soil in the hole by using a slag dragging bucket to ensure that the thickness of the sediment meets the requirement; and after the final hole is confirmed, hoisting the steel reinforcement cage and the pouring guide pipe, measuring the sediment at the bottom of the hole again before pouring, and pouring concrete to form a pile after the sediment thickness meets the design requirement.

In the stratum with poor underground water, the full-casing full-slewing drilling machine is mainly used for dry hole drilling, manual hole entering is adopted for slag removal, or a slag removing bucket is used for easily removing the slag at the bottom of the hole.

However, when the underground water-rich stratum is in, the mud in the casing makes the hole cleaning by the slag scoop difficult, and especially when the bottom of the casing does not completely follow the bottom of the hole, the hole cleaning time is long, or the requirements of design and specification on the thickness of sediment are difficult to meet.

At the moment, after the steel reinforcement cage and the pouring guide pipe are placed and before concrete is poured, secondary circulation hole cleaning is carried out by adopting gas lift reverse circulation. However, the operating platform of the full-rotation full-casing drilling machine is about 3m higher than the ground, so that the gas-lift reverse circulation hole cleaning operation of slurry in the casing is realized on site, the arrangement of a circulating pipeline is extremely difficult, a slurry pool, an air compressor, the circulating pipeline and the like need to be arranged, the field installation time is long, a large crane is used for auxiliary operation, and the construction efficiency is greatly influenced.

Disclosure of Invention

In order to solve the problems of hole bottom sediment hole cleaning of the full-sleeve full-rotation cast-in-place pile, a method for performing primary hole cleaning and secondary hole cleaning of a sediment cleaning barrel for gas lift reverse circulation in a sleeve is researched and summarized by combining multiple engineering examples, and the effects of convenient hole cleaning, simple operation, high hole cleaning speed and good pile forming quality are achieved.

The technical purpose of the invention is realized by the following technical scheme:

the utility model provides a hole cleaning system of bored concrete pile, includes crane assembly, air compressor machine, high-pressure air pipe and the scarfing cinder bucket of once clear hole process usefulness, crane assembly will clear the cinder bucket and hang to being equipped with sheathed tube stake hole bottom of the hole, just clear have the interval between cinder bucket and the stake hole bottom of the hole, the air compressor machine pass through the high-pressure air pipe to interval department output high pressure gas, the sediment and the high-pressure gas of stake hole bottom of the hole mix the back, along clear cinder bucket and the flow that rises of the clearance between the sleeve pipe to get into clear cinder bucket by clear cinder bucket top.

Preferably, the slag removing barrel is provided with an opening at the top end and a closed bottom end, two orifices are formed in the bottom surface of the slag removing barrel, two high-pressure air pipes are arranged, and the outlet ends of the high-pressure air pipes are welded with the two orifices respectively.

Preferably, the slag removing barrel is made of cast steel, the height of the slag removing barrel is 1300mm, the outer diameter of the slag removing barrel is 900mm, the wall thickness of the slag removing barrel is 25mm, and the diameter of the high-pressure air pipe is 25mm or 20 mm.

Preferably, the top end of the slag removing barrel is provided with a cross beam, the cross beam is provided with a first hanging ring, and the outer body of the slag removing barrel is provided with an inclined hanging ring.

Preferably, the device further comprises a slag removal head for the secondary hole cleaning process, wherein a hollow cavity is formed in two ends of the slag removal head in a penetrating mode, the top end of the hollow cavity is connected with the air outlet end of the high-pressure air pipe, and a second hanging ring is arranged at the top end of the slag removal head.

Preferably, the slag removing head is made of cast iron, the height of the slag removing head is 1200mm, the outer diameter of the slag removing head is 1800mm, the wall thickness of the slag removing head is 50mm, and the inner diameter of the hollow cavity is 80 mm.

A hole cleaning method for a cast-in-place pile comprises a full casing full-back drilling process S1, a primary hole cleaning process S2, a steel reinforcement cage and cast-in-place conduit placing process S3, a pile hole bottom sediment thickness measuring process S4 and a concrete casting process S6;

forming the pile hole provided with the sleeve through a full-sleeve full-back drilling process S1, wherein the primary hole cleaning process S2 comprises the following steps:

s21, preparing a crane component, an air compressor, a high-pressure air pipe and a slag removal barrel, wherein one end of the high-pressure air pipe is connected with the air compressor, and the other end of the high-pressure air pipe is connected with the barrel bottom of the slag removal barrel;

s22, hoisting the slag removal barrel to the bottom of the pile hole by using the crane assembly, wherein a gap is formed between the slag removal barrel and the bottom of the pile hole;

and S23, starting an air compressor, inputting high-pressure air into the space through a high-pressure air pipe by the air compressor, mixing the high-pressure air with the slurry at the bottom of the pile hole, utilizing the pressure difference to lift and flow along the gap between the slag cleaning barrel and the sleeve, and flowing into the slag cleaning barrel when flowing to the top of the slag cleaning barrel.

Preferably, the slag removing barrel is open at the top end, the bottom end of the slag removing barrel is closed, two orifices are formed in the bottom surface of the slag removing barrel, two high-pressure air pipes are arranged, the outlet ends of the high-pressure air pipes are respectively welded with the two orifices, and the diameters of the two high-pressure air pipes are respectively 20mm and 25 mm;

in the step S21, when the depth of the pile hole is less than 50m, the air compressor is communicated with the high-pressure air pipe with the diameter of 25mm, and when the depth of the pile hole is more than or equal to 50m, the air compressor is communicated with the high-pressure air pipe with the diameter of 20 mm;

in the step S22, the crane assembly lifts the slag cleaning barrel to the bottom of the pile hole in advance, records the depth of the hole, and lifts the slag cleaning barrel by 40cm-60cm, wherein the interval is 40cm-60 cm.

Preferably, after the steel reinforcement cage and the pouring guide pipe placing process S3, the steel reinforcement cage and the pouring guide pipe are arranged in the pile hole, and the pile hole bottom sediment thickness measuring process S4 includes the following steps:

s41, placing the measuring rope with the reinforcing steel bar head to the hole bottom of the pile hole, and measuring whether the thickness of the pile hole bottom meets the design requirement or not;

s42, if the concrete pouring speed is consistent with the preset concrete pouring speed, the concrete pouring process S6 is carried out; if not, performing a secondary hole cleaning step S5;

and the secondary hole cleaning process S5 suspends the sediments at the bottom of the pile hole to reduce the thickness of the sediments.

Preferably, the secondary hole cleaning process S5 includes the steps of:

s51, preparing a slag removal head with a hollow cavity, connecting an air outlet of the high-pressure air pipe with the top end of the hollow cavity, and connecting an air inlet of the high-pressure air pipe with an air compressor;

s52, placing the slag removal head into the pouring guide pipe by using a crane assembly until the position of the bottom of the pile hole is reached, and then lifting the pile hole by 30-50 cm;

s53, starting the air compressor, and closing after about 5-10 min;

s54, measuring the thickness of the sediment at the bottom of the pile hole again in a working procedure S4;

and S55, if the thickness of the pile hole bottom sediment meets the requirement, performing a concrete pouring procedure S6, and if the thickness of the pile hole bottom sediment does not meet the requirement, repeating the steps S53-S55.

The hole cleaning system and the hole cleaning method for the cast-in-place pile provided by the invention have the following advantages:

1. hole cleaning equipment is convenient

The primary hole cleaning and slag removing barrel and the secondary hole cleaning and slag removing head are manufactured according to the construction characteristics of the full-rotation full-casing cast-in-place pile, and are small in size, light in weight and simple in design and manufacture; only need to be connected with the air pipe of the air compressor, the installation is simple and convenient; when in use, the hoisting operation is adopted, so that the installation and deslagging are convenient, the field operation is easy, and the use is convenient and fast in the hole cleaning process;

2. the cleaning effect of the sediment at the bottom of the hole is good

The invention combines the slag removal of the slag salvaging bucket which is fully rotated and drilled in a full sleeve after the final hole, and adopts the slag removal barrel to carry out gas lift reverse circulation slag removal in the sleeve, the high wind pressure can repeatedly circulate the sediment at the bottom of the hole, and the sediment is continuously discharged through the slag removal barrel, thus ensuring the effect of primary hole removal; after a steel reinforcement cage and a pouring guide pipe are arranged in a hole, if the sediment at the bottom of the hole exceeds the standard, a special sediment removal head is adopted to suspend the sediment in slurry, and the pile body concrete is quickly poured, so that the sediment at the bottom of the pile can meet the design and specification requirements;

3. is beneficial to the field civilized construction

The invention can effectively pour the sediments in a specified place through the casing gas lift internal circulation, and compared with the traditional gas lift reverse circulation, the invention can avoid digging a slurry circulation system and preventing the construction site from being muddy due to the disordered spraying of the slurry;

4. low cost of cleaning holes

The hole cleaning equipment is cheap to manufacture, complex and large-scale hole cleaning equipment is not used in the operation, the amount of generated mud is small, the hole cleaning time is short, and the overall construction comprehensive cost is low.

Drawings

FIG. 1 is a schematic diagram of a primary hole cleaning process according to the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

FIG. 3 is a front view of the slag removal barrel of the present invention;

FIG. 4 is a top view of the slag removing barrel of the present invention;

FIG. 5 is a schematic diagram of the secondary hole cleaning process according to the present invention;

FIG. 6 is a partial enlarged view of FIG. 5 at B;

FIG. 7 is a front view of the scarfing cinder head of the present invention.

The reference numerals in the figures are explained below:

1. a crane assembly; 2. an air compressor; 3. a high pressure air duct; 4. a slag removal barrel; 5. a sleeve; 6. a cross beam; 7. a first hanging ring; 8. the hanging ring is inclined; 9. removing slag; 10. a hollow space; 11. a second hoisting ring; 12. a reinforcement cage; 13. the catheter is perfused.

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.

Because the operating platform of the full-rotation full-casing drilling machine is about 3m higher than the ground, the gas lift reverse circulation hole cleaning operation of the slurry in the casing is realized on site, the arrangement of a circulating pipeline is extremely difficult, a slurry pool, an air compressor, the circulating pipeline and the like need to be arranged, the field installation time is long, a large crane is used for auxiliary operation, and the construction efficiency is greatly influenced.

In order to solve the problems of hole bottom sediment hole cleaning of the full-sleeve full-rotation cast-in-place pile, a method for performing primary hole cleaning and secondary hole cleaning of a sediment cleaning barrel for gas lift reverse circulation in a sleeve is researched and summarized by combining multiple engineering examples, the effects of convenient hole cleaning, simple operation, high hole cleaning speed and good pile forming quality are achieved, and the specific solution is as follows.

The utility model provides a hole cleaning system of bored concrete pile, as shown in figure 1, including crane assembly 1, air compressor machine 2, high-pressure air pipe 3 and the scarfing cinder bucket 4 that once the clear hole process was used, crane assembly 1 hangs scarfing cinder bucket 4 to the stake hole bottom that is equipped with sleeve pipe 5, and has the interval between scarfing cinder bucket 4 and the stake hole bottom, air compressor machine 2 exports high-pressure gas to the interval through high-pressure air pipe 3, the sediment of stake hole bottom is mixed with high-pressure gas after, rises along the clearance between scarfing cinder bucket 4 and sleeve pipe 5 and flows to get into scarfing cinder bucket 4 by scarfing cinder bucket 4 top.

The slag removing barrel 4 is provided with an opening at the top end and a closed bottom end, the bottom surface of the slag removing barrel is provided with two orifices, the number of the high-pressure air pipes 3 is two, and the outlet ends of the high-pressure air pipes are respectively welded with the two orifices; in addition, the slag cleaning barrel 4 can be connected with only one high-pressure air pipe 3.

The slag cleaning barrel 4 is made of cast steel, the height of the slag cleaning barrel 4 is 1300mm, the outer diameter of the slag cleaning barrel is 900mm, the wall thickness of the slag cleaning barrel is 25mm, if only one high-pressure air pipe 3 is arranged on one slag cleaning barrel 4, the diameter of the high-pressure air pipe 3 is 25mm or 20mm, and if two high-pressure air pipes 3 are arranged on one slag cleaning barrel 4, the diameters of the two high-pressure air pipes 3 are 25mm or 20m respectively.

A cross beam 6 is arranged at the top end of the slag removing barrel 4, a first lifting ring 7 is arranged on the cross beam 6, and an inclined lifting ring 8 is arranged on the outer body of the slag removing barrel 4; the first lifting ring 7 is used for lifting the slag cleaning barrel 4, and the inclined lifting ring 8 and the first lifting ring 7 are matched to ensure that the opening of the slag cleaning barrel 4 is obliquely lifted downwards so as to pour out slurry in the slag cleaning barrel 4.

The specific working principle of the primary hole cleaning procedure is as follows: the primary hole cleaning process is carried out after full-rotary drilling is carried out to the designed depth, the slag cleaning barrel 4 connected with the high-pressure air pipe 3 is hung near the bottom of the hole during hole cleaning, the air compressor 2 is started, high-pressure air is sent into the space between the bottom of the pile hole and the bottom of the slag cleaning barrel 4 to be mixed with slurry, a low-pressure area is generated near the bottom of the slag cleaning barrel 4, the internal and external pressure difference of continuous inflation is continuously increased, after a certain pressure difference is achieved, the gas-liquid mixture rises and flows along the gap between the slag cleaning barrel 4 and the sleeve 5, the top end of the slag cleaning barrel 4 is open, further kinetic energy of gas and liquid is lost after the gas-liquid mixture rises to a certain height, the gas and liquid fall into the slag cleaning barrel 4 and the bottom, and partial sediment is accumulated in the slag cleaning barrel 4, and thus a circulating type reverse hole cleaning mode by lifting of the.

Carrying out gas lift reverse circulation on the sediment at the bottom of the hole carried by the mud in the hole in the sleeve 5, continuously dropping the sediment into the sediment removal barrel 4 for storage, intermittently stopping for 15 minutes after the gas lift reverse circulation runs for about 15 minutes each time, and then lifting the sediment removal barrel 4 out of the hole opening for sediment removal; and performing multiple circulation, slag storage and slag dumping circulation operations until the sediment at the bottom of the hole is completely removed.

The method aims to solve the problem that after primary hole cleaning and before concrete pouring, a large amount of sediments are still left at the bottom of a pile hole and the sediment thickness requirement is not met.

The hole cleaning system provided by the invention also comprises a slag cleaning head 9 used in the secondary hole cleaning process, wherein two ends of the slag cleaning head 9 are provided with hollow holes 10 in a penetrating manner, the top end of each hollow hole 10 is connected with the air outlet end of the high-pressure air pipe 3, and the top end of the slag cleaning head 9 is provided with a second hanging ring 11.

The slag removal head 9 is made of cast iron, the height of the slag removal head is 1200mm, the outer diameter of the slag removal head is 1800mm, the wall thickness of the slag removal head is 50mm, and the inner diameter of the hollow hole 10 is 80 mm.

After the reinforcement cage 12 and the pouring conduit 13 are put in place and before concrete is poured, the thickness of the sediment at the bottom of the pile hole needs to be measured again, and if the measured sediment thickness exceeds the design requirement, secondary hole cleaning needs to be carried out according to the specification requirement.

The specific working principle of the secondary hole cleaning process is as follows: the slag removing head 9 connected with the high-pressure air pipe 3 is lowered to the position near the hole bottom through the filling pipe 13, the air compressor 2 is started, high-pressure air is blown out from the bottom of the slag removing head 9 and mixed with sediments at the hole bottom of the pile hole to form a gas-liquid mixture which is suspended in the sleeve 5, the sediments at the hole bottom of the pile hole below the filling pipe 13 are suspended above the hole bottom of the pile hole, and concrete is quickly filled into the filling pipe 13 to form the filling pile.

Under the condition that the primary hole cleaning of the slag cleaning barrel 4 meets the requirements, the secondary hole cleaning of the slag cleaning head 9 is mainly realized by using the air lift circulation mode to remove the sediments at the bottom of the pile hole, so that the effect of suspending the sediments is achieved, and the construction technical requirements can be completely met.

The invention provides a hole cleaning system of a cast-in-place pile and also provides a hole cleaning method of the cast-in-place pile, which comprises a full casing 5 full-back drilling process S1, a primary hole cleaning process S2, a steel reinforcement cage and cast-in-place conduit placing process S3, a pile hole bottom sediment thickness measuring process S4, a secondary hole cleaning process S5 and a concrete casting process S6.

Each step will be described in detail below.

First, full back drilling process S1

S11, adopting a scene safety worker JAR260H full-slewing drilling machine and a special steel sleeve 5, wherein the diameter phi of the sleeve 5 is 1000, and the special steel sleeve is matched with a 120-type crawler crane, a 220-type excavator and the like;

s12, using a full-casing 5 full-slewing drilling machine and a specially-equipped hydraulic power station to perform slewing cut-in on the steel casing 5 with the special cutter head, and using a grab bucket to repeatedly grab soil in the full casing 5 to take out the soil; when meeting a rock block, a boulder or a hard interlayer, the boulder is broken by using a cross punching hammer and then grabbed by using a punching claw.

S13, when the grab bucket fetches earth, the casing 5 is required to exceed the hole forming depth by about 1m, and when each casing 5 is pressed into a pile hole to the residual 50cm on the drilling machine platform, the next casing 5 is timely connected to meet the hole forming requirement;

s14, repeatedly taking earth by using a grab bucket and cutting into the full-rotation full casing 5 by rotary excavation until the earth reaches the position near the upper part of the designed rock stratum;

s15, when the depth position of the designed bearing stratum is approached, a cross-shaped impact hammer is adopted to break the rock stratum, then a grab bucket is used to grab a rock sample, and rock entering judgment is carried out with units such as investigation, design and supervision; after the rock stratum is judged, the cross-shaped punch hammer is continuously used for crushing the rock stratum until the designed depth is reached, and the cross-shaped punch hammer and units such as supervision units, owners and the like are subjected to final hole acceptance inspection

And S16, after the final hole is checked and accepted, the slag is fished in the hole by using a slag-fishing bucket.

Second, first hole cleaning process S2

After the slag is fished by the slag-fishing bucket, sediment still exists at the bottom of the pile hole, and the hole cleaning process is carried out by the slag-cleaning bucket 4.

S21, preparing a crane component 1, an air compressor 2, a high-pressure air pipe 3 and a slag cleaning barrel 4, wherein one end of the high-pressure air pipe 3 is connected with the air compressor 2, and the other end of the high-pressure air pipe is connected with the barrel bottom of the slag cleaning barrel 4;

s22, hoisting the slag removal barrel 4 to the bottom of the pile hole by using the crane assembly 1, wherein a gap is formed between the slag removal barrel and the bottom of the pile hole;

s23, starting the air compressor 2, inputting high-pressure air into the space by the air compressor 2 through the high-pressure air pipe 3, mixing the high-pressure air with the slurry at the bottom of the pile hole, utilizing the pressure difference to rise and flow along the gap between the slag cleaning barrel 4 and the sleeve 5, and flowing into the slag cleaning barrel 4 when flowing to the top of the slag cleaning barrel 4.

The slag removing barrel 4 is provided with an opening at the top end and a closed bottom end, two orifices are arranged on the bottom surface of the slag removing barrel, two high-pressure air pipes 3 are arranged, the outlet ends of the high-pressure air pipes are respectively welded with the two orifices, and the diameters of the two high-pressure air pipes 3 are respectively 20mm and 25 mm;

in the step S21, when the pile hole depth is less than 50m, the air compressor 2 communicates with the high-pressure air duct 3 with a diameter of 25mm, and when the pile hole depth is greater than or equal to 50m, the air compressor 2 communicates with the high-pressure air duct 3 with a diameter of 20 mm;

in the step S22, the crane assembly 1 lifts the slag cleaning barrel 4 to the bottom of the pile hole in advance, records the depth of the hole, and lifts the slag cleaning barrel 4 by 40cm-60cm at intervals of 40cm-60 cm.

Thirdly, placing procedure S3 of the reinforcement cage and the perfusion catheter

S31, manufacturing the reinforcement cage 12 according to design requirements, and hoisting and placing the reinforcement cage into the pile hole after the reinforcement cage is qualified through field acceptance;

s32, hoisting the reinforcement cage 12 by using a crane, vertically hoisting the reinforcement cage 12 in place at one time, welding the reinforcement cage 12 needing to be connected with the cage on a full-slewing drilling machine, wherein the welding length needs to meet the design requirement;

s33, placing the perfusion guide pipe 13 after the placement of the reinforcement cage 12 is finished, placing the perfusion guide pipe by adopting a phi 288 guide pipe until the bottom of the guide pipe is 30-50 cm away from the bottom of the hole, and adding a guide pipe frame at the pipe orifice of the full casing pipe 5 after the placement of the guide pipe is finished so as to stabilize the guide pipe.

Fourthly, the thickness measuring procedure S4 of the sediment at the bottom of the pile hole

After the pouring guide pipe 13 is completely placed, the thickness of the sediment at the bottom of the pile hole is measured again after the concrete tank truck arrives at the site, and whether the design requirements are met is determined.

S41, placing the measuring rope with the reinforcing steel bar head to the hole bottom of the pile hole, and measuring whether the thickness of the pile hole bottom meets the design requirement or not;

s42, if the concrete pouring speed is consistent with the preset concrete pouring speed, the concrete pouring process S6 is carried out; if not, performing a secondary hole cleaning step S5;

the secondary hole cleaning process S5 is used for suspending the sediments at the bottom of the pile hole to reduce the thickness of the sediments.

Fifth, secondary hole cleaning process S5

S51, preparing a slag removal head 9 with a hollow hole 10, connecting an air outlet of the high-pressure air pipe 3 with the top end of the hollow hole 10, and connecting an air inlet of the high-pressure air pipe with the air compressor 2;

s52, placing the slag removal head 9 into the pouring guide pipe 13 by using the crane assembly 1 until the position of the bottom of the pile hole is reached, and then lifting the pile hole by 30-50 cm;

s53, starting the air compressor 2, and closing after about 5-10 min;

s54, measuring the thickness of the sediment at the bottom of the pile hole again in a working procedure S4;

and S55, if the thickness of the pile hole bottom sediment meets the requirement, performing a concrete pouring procedure S6, and if the thickness of the pile hole bottom sediment does not meet the requirement, repeating the steps S53-S55.

Sixthly, a concrete pouring procedure S6

S61, after the thickness of the sediment at the bottom of the hole meets the requirement, the installation of the orifice pouring hopper is quickly finished, the pouring of concrete is immediately started, and the preparation time is shortened to the maximum extent;

s62, hanging and filling the cast-in-place concrete by using a hopper, determining the amount of the primarily poured concrete according to the pile diameter and the embedding depth of the guide pipe, and ensuring that the rising height of the concrete surface exceeds the bottom of the guide pipe by more than 0.5m during primary pouring;

s63, pouring concrete while pulling out the sleeve 5, measuring the height of the concrete surface in time after pulling out each section of the sleeve 5, and ensuring that the lowest end of the sleeve 5 is at a sufficient depth below the concrete surface, wherein the lowest end of the sleeve 5 is not less than 8m below the concrete surface due to the fact that the project is in a karst development area, and the problem that the concrete is leaked at a karst cave section to cause an accident of pouring in a hole is avoided.

Wherein, the concrete with the strength grade of C35 is used for underwater pouring.

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.

Claims (10)

1. The utility model provides a hole cleaning system of bored concrete pile, its characterized in that, includes crane assembly (1), air compressor machine (2), high-pressure air pipe (3) and clear slag barrel (4) that the hole cleaning process was used once, crane assembly (1) will clear slag barrel (4) and hang to the pile hole bottom that is equipped with sleeve pipe (5), just clear slag barrel (4) and pile hole bottom between have the interval, air compressor machine (2) through high-pressure air pipe (3) to interval department output high pressure gas, the sediment and the high-pressure gas of pile hole bottom mix the back, rise along the clearance between clear slag barrel (4) and sleeve pipe (5) and flow to get into clear slag barrel (4) by clear slag barrel (4) top.

2. A hole cleaning system for a cast-in-place pile according to claim 1, wherein the slag cleaning barrel (4) is open at the top end and closed at the bottom end, and is provided with two holes on the bottom surface, and the high-pressure air pipes (3) are provided with two holes, and the outlet ends of the high-pressure air pipes are respectively welded with the two holes.

3. A hole cleaning system for cast-in-place piles according to claim 1, characterized in that the slag cleaning barrel (4) is made of cast steel, with a height of 1300mm, an outer diameter of 900mm and a wall thickness of 25mm, and the diameter of the high-pressure air pipe (3) is 25mm or 20 mm.

4. A hole cleaning system for a cast-in-place pile according to claim 1, wherein a cross beam (6) is arranged at the top end of the slag cleaning barrel (4), a first hanging ring (7) is arranged on the cross beam (6), and an inclined hanging ring (8) is arranged on the outer body of the slag cleaning barrel (4).

5. The hole cleaning system of the cast-in-place pile according to claim 1, further comprising a slag cleaning head (9) for the secondary hole cleaning process, wherein a hollow cavity (10) is formed at two ends of the slag cleaning head (9) in a penetrating manner, the top end of the hollow cavity (10) is connected with the air outlet end of the high-pressure air pipe (3), and a second hanging ring (11) is arranged at the top end of the slag cleaning head (9).

6. A hole cleaning system for a cast-in-place pile according to claim 5, characterized in that the slag removal head (9) is made of cast iron and has a height of 1200mm, an outer diameter of 1800mm, a wall thickness of 50mm and an inner diameter of 80mm in the hollow space (10).

7. A hole cleaning method for a cast-in-place pile is characterized by comprising a full-casing full-back drilling process S1, a primary hole cleaning process S2, a steel reinforcement cage and cast-in-place conduit placing process S3, a pile hole bottom sediment thickness measuring process S4 and a concrete casting process S6;

forming a pile hole provided with a sleeve (5) through a full sleeve full back drilling process S1, wherein the primary hole cleaning process S2 comprises the following steps:

s21, preparing a crane component (1), an air compressor (2), a high-pressure air pipe (3) and a slag cleaning barrel (4), wherein one end of the high-pressure air pipe (3) is connected with the air compressor (2), and the other end of the high-pressure air pipe is connected with the barrel bottom of the slag cleaning barrel (4);

s22, hoisting the slag cleaning barrel (4) to the bottom of the pile hole by using the crane assembly (1), and forming a gap between the slag cleaning barrel and the bottom of the pile hole;

s23, starting the air compressor (2), inputting high-pressure air into the space by the air compressor (2) through the high-pressure air pipe (3), mixing the high-pressure air with slurry at the bottom of the pile hole, utilizing pressure difference to flow upwards along the gap between the slag cleaning barrel (4) and the sleeve (5), and flowing into the slag cleaning barrel (4) when flowing to the top of the slag cleaning barrel (4).

8. The hole cleaning method for the cast-in-place pile according to claim 7, wherein the slag cleaning barrel (4) is open at the top end and closed at the bottom end, two holes are formed in the bottom surface of the slag cleaning barrel, two high-pressure air pipes (3) are arranged, the outlet ends of the high-pressure air pipes are respectively welded with the two holes, and the diameters of the two high-pressure air pipes (3) are respectively 20mm and 25 mm;

in the step S21, when the pile hole depth is less than 50m, the air compressor (2) is communicated with the high-pressure air pipe (3) with the diameter of 25mm, and when the pile hole depth is more than or equal to 50m, the air compressor (2) is communicated with the high-pressure air pipe (3) with the diameter of 20 mm;

in the step S22, the crane assembly (1) lifts the slag cleaning barrel (4) to the bottom of the pile hole in advance, records the depth of the hole, and lifts the slag cleaning barrel (4) by 40cm-60cm, wherein the interval is 40cm-60 cm.

9. A method for cleaning the hole of the cast-in-place pile according to claim 7, wherein the steel reinforcement cage (12) and the cast-in-place pipe (13) are installed in the pile hole after the steel reinforcement cage and cast-in-place pipe installing process S3, and the pile hole bottom sediment thickness measuring process S4 comprises the following steps:

s41, placing the measuring rope with the reinforcing steel bar head to the hole bottom of the pile hole, and measuring whether the thickness of the pile hole bottom meets the design requirement or not;

s42, if the concrete pouring speed is consistent with the preset concrete pouring speed, the concrete pouring process S6 is carried out; if not, performing a secondary hole cleaning step S5;

and the secondary hole cleaning process S5 suspends the sediments at the bottom of the pile hole to reduce the thickness of the sediments.

10. A method for cleaning holes of cast-in-place piles according to claim 9, wherein the secondary hole cleaning process S5 includes the steps of:

s51, preparing a slag removal head (9) with a hollow cavity (10), connecting an air outlet of the high-pressure air pipe (3) with the top end of the hollow cavity (10), and connecting an air inlet of the high-pressure air pipe with the air compressor (2);

s52, placing the slag removal head (9) into the pouring guide pipe (13) by using the crane assembly (1) until the position of the bottom of the pile hole is reached, and then lifting the pile hole by 30-50 cm;

s53, starting the air compressor (2), and closing after about 5-10 min;

s54, measuring the thickness of the sediment at the bottom of the pile hole again in a working procedure S4;

and S55, if the thickness of the pile hole bottom sediment meets the requirement, performing a concrete pouring procedure S6, and if the thickness of the pile hole bottom sediment does not meet the requirement, repeating the steps S53-S55.

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