CN213773373U - Cast-in-place pile hole cleaning equipment - Google Patents

Abstract

The utility model discloses a clear hole equipment of bored concrete pile, include: the device comprises a conduit, an air inlet pipe and a negative pressure generating device; the guide pipe is provided with a bottom end which is sunk into the cast-in-place pile hole and a top end which is exposed out of the cast-in-place pile hole, and the bottom end of the guide pipe and sediment at the bottom of the cast-in-place pile hole are separated by a first preset distance; one end of the air inlet pipe is connected to the position, on the bottom pipe wall of the conduit, of a second preset distance away from the bottom end of the conduit, and the other end of the air inlet pipe is connected with the negative pressure generating device; the negative pressure generating device is used for generating a negative pressure area at the bottom of the conduit through the air inlet pipe so as to discharge sediment through the top end of the conduit through the negative pressure area. In this bored concrete pile clear hole equipment, the sediment is discharged through the pipe top under the effect of negative pressure zone, and under the prerequisite that pipe diameter and negative pressure zone satisfy the requirement, the discharge of sediment does not receive the influence of sediment granule size, can discharge outside the bored concrete pile hole completely for bored concrete pile hole bottom sediment thickness and mud sand content satisfy the design specification requirement.

Description

Cast-in-place pile hole cleaning equipment

Technical Field

The application relates to the technical field of cast-in-place pile hole cleaning, in particular to cast-in-place pile hole cleaning equipment.

Background

The cast-in-situ bored pile is used as a foundation structure of a large building and a building group, and is a main stress structure of the building no matter in a foundation pit excavation stage or after the whole building is completed. When the bored pile is formed into a pile, if the sediment at the hole bottom of the bored pile is too thick, the bearing capacity of the bored pile is reduced, according to the analysis of the ultrasonic detection result of the underground pile in the prior art, under the normal condition of pile foundation concrete pouring, the stress defect of the bored pile is caused by the internal clamping blocks at the edge part of the concrete of the pile foundation, and most of the internal clamping blocks are mixed with the local position in the concrete. Through analysis, the clamping blocks are roughly composed of two parts, namely gravel sediments in slurry and clay or gravel blocks scraped from the hole wall when the reinforcement cage is lowered. When the pile is poured, the clamping blocks can rise along with the concrete, and due to the obstruction of the reinforcement cage and the hole wall, the clamping blocks are stopped in a local range, and finally the local stress defect in the pile is caused. If the pile bottom sediment is too thick and cannot be effectively treated, the instability of the pile bottom or the sediment inclusion of the pile body can cause irreparable influence on the construction process and the final building safety.

The prior treatment of the sediment at the bottom of the hole mainly comprises the following two modes:

the mud pump mud circulation hole cleaning method is characterized in that mud is injected into the bottom of a hole through a drill rod or a guide pipe to drive precipitates to float upwards, the precipitates such as gravel in the mud have the tendency of sinking under the action of gravity, and if the flow of the mud pump is small, large gravel is suspended at a certain height; if larger sediment particles need to be discharged out of the hole, the circulation speed of the mud is increased on one hand, and the density of the mud is increased on the other hand, but the circulation speed of the mud is difficult to be greatly increased due to the limitation of the discharge capacity of the existing mud pump, and a method for increasing the specific gravity of the mud is difficult to realize. In addition, the flow velocity of the mud at the hole wall is slower than that of the mud at the center of the hole, so that the sand content of the mud is uneven, and large particles in the mud cannot be completely replaced outside the hole finally.

The other is a sand pumping method, specifically, a sand stirring submersible pump or a sand suction pump is used for sinking into the bottom of the pile, the sediment at the bottom of the pile is directly sucked into a pump pipe through a pump port, and the sediment is replaced outside the pile from the bottom of the pile. If the pump type is too low, large suspended particles cannot be sucked out of the pile, the pump sinking method is difficult to control the position of the pump sinking, and if the diameter of the pile is too large, sediments at the bottom of a hole cannot be cleaned.

SUMMERY OF THE UTILITY MODEL

The application aims at providing a clear hole equipment of bored concrete pile, through the produced negative pressure zone of pipe bottom with the sediment thing discharge outside the bored concrete pile hole at bored concrete pile hole bottom for hole bottom sediment thickness and mud sand content satisfy the design specification requirement, improve concrete pile body quality.

The application provides a clear hole equipment of bored concrete pile includes: the device comprises a conduit, an air inlet pipe and a negative pressure generating device; the guide pipe is provided with a bottom end which is sunk into the cast-in-place pile hole and a top end which is exposed out of the cast-in-place pile hole, and a first preset distance is reserved between the bottom end of the guide pipe and sediment at the bottom of the cast-in-place pile hole; one end of the air inlet pipe is connected to the position, on the bottom pipe wall of the conduit, of a second preset distance away from the bottom end of the conduit, and the other end of the air inlet pipe is connected with the negative pressure generating device; the negative pressure generating device is used for generating a negative pressure area at the bottom of the conduit through the air inlet pipe so as to discharge the sediments from the top end of the conduit through the negative pressure area.

Further, still include: and the sand filter is provided with a slurry inlet connected with the top end of the guide pipe and used for filtering discharged sediments.

Further, still include: one end of the connecting elbow is connected with the top end of the guide pipe, and the other end of the connecting elbow is connected with a slurry inlet of the sand filter; the connecting elbow is also provided with an openable or closable elbow blank cap.

Further, the port of the bottom end of the conduit is a bevel, and the tip of the bevel is formed as the bottom end of the conduit.

Furthermore, one end and the other end of the air inlet pipe are fixed on the pipe wall of the conduit.

Further, still include: and a first port of the conduit joint is connected to the position, on the bottom pipe wall of the conduit, at a second preset distance from the bottom end of the conduit, and a second port of the conduit joint is connected with one end of the air inlet pipe.

Further, the catheter adapter comprises: the gas inlet pipe comprises a first pipe section and a second pipe section, wherein one end of the first pipe section is connected to the pipe wall of the guide pipe at a second preset distance from the bottom end of the guide pipe, the other end of the first pipe section is connected with one end of the second pipe section, the other end of the second pipe section is connected with one end of the gas inlet pipe, one end of the first pipe section is formed into a first port, and the other end of the second pipe section is formed into a second port; the length direction of the first pipe section extends from the bottom end of the guide pipe to the top end of the guide pipe and inclines outwards, and the length direction of the second pipe section is parallel to the length direction of the guide pipe.

Further, the catheter includes: the plurality of pipe bodies are sequentially connected end to end; the bottom end of the bottommost tube body is formed as the bottom end of the catheter, and the top end of the topmost tube body is formed as the top end of the catheter.

Further, the first preset distance is between 200mm and 300 mm.

Further, the second preset distance is between 200mm and 300 mm.

According to the clear hole equipment of bored concrete pile that this application provided, include: the device comprises a conduit, an air inlet pipe and a negative pressure generating device; the guide pipe is provided with a bottom end which is sunk into the cast-in-place pile hole and a top end which is exposed out of the cast-in-place pile hole, and a first preset distance is reserved between the bottom end of the guide pipe and sediment at the bottom of the cast-in-place pile hole; one end of the air inlet pipe is connected to the position, on the bottom pipe wall of the conduit, of a second preset distance away from the bottom end of the conduit, and the other end of the air inlet pipe is connected with the negative pressure generating device; the negative pressure generating device is used for generating a negative pressure area at the bottom of the conduit through the air inlet pipe so as to discharge the sediments from the top end of the conduit through the negative pressure area. In the cast-in-place pile hole cleaning equipment, the negative pressure generating device enables the bottom of the guide pipe to generate a negative pressure area through the air inlet pipe, and precipitates at the hole bottom of the cast-in-place pile hole are discharged out of the cast-in-place pile hole through the guide pipe under the action of the pressure difference between atmospheric pressure and the negative pressure area. The sediment is discharged through the pipe top under the effect of negative pressure zone and forms reverse circulation's discharge mode, and under the prerequisite that pipe diameter and atmospheric pressure and negative pressure zone's pressure differential satisfied requirement, the discharge of sediment does not receive the influence of sediment granule size, can discharge outside the bored concrete pile hole completely for bored concrete pile hole bottom sediment thickness and mud sand content satisfy the design specification requirement, and then improve concrete pile body quality. The equipment is simple to manufacture and convenient and flexible to use.

Drawings

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

fig. 2 is a schematic view showing a first using process of the cast-in-place pile hole cleaning equipment provided by the application;

fig. 3 is a schematic view of a second use process of the cast-in-place pile hole cleaning device provided by the present application;

fig. 4 is a schematic structural diagram of a negative pressure generating device in the cast-in-place pile hole cleaning equipment provided by the present application;

fig. 5 is a schematic structural diagram of a connecting elbow in the cast-in-place pile hole cleaning equipment provided by the present application;

fig. 6 is a schematic structural diagram of a conduit connecting air pipe in the cast-in-place pile hole cleaning equipment provided by the application.

Detailed Description

The present invention will be described in further detail with reference to the following detailed description and accompanying drawings. Wherein like elements in different embodiments are numbered with like associated elements. In the following description, numerous details are set forth in order to provide a better understanding of the present application. However, those skilled in the art will readily recognize that some of the features may be omitted or replaced with other elements, materials, methods in different instances. In some instances, certain operations related to the present application have not been shown or described in detail in order to avoid obscuring the core of the present application from excessive description, and it is not necessary for those skilled in the art to describe these operations in detail, so that they may be fully understood from the description in the specification and the general knowledge in the art.

Furthermore, the features, operations, or characteristics described in the specification may be combined in any suitable manner to form various embodiments. Also, the various steps or actions in the method descriptions may be transposed or transposed in order, as will be apparent to one of ordinary skill in the art. Thus, the various sequences in the specification and drawings are for the purpose of describing certain embodiments only and are not intended to imply a required sequence unless otherwise indicated where such sequence must be followed.

The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings).

The application provides a clear hole equipment of bored concrete pile mainly used clears up the precipitate of bored concrete pile hole bottom department, and this precipitate mainly is the gravel that produces when by drilling and when transferring the steel reinforcement cage solid particles such as clay, sand stone that scrape off from the pore wall constitute to form the mixture of constituteing such as including water, earth and precipitate at bored concrete pile hole bottom, this clear hole equipment of bored concrete pile mainly clears up the solid particle in the precipitate. Specifically, the guide pipe is sunk into the cast-in-place pile hole, the bottom end of the guide pipe sunk into the cast-in-place pile hole is immersed into the muddy water mixture and is at a certain distance from sediment at the bottom, the negative pressure generating device enables the bottom of the guide pipe to generate a negative pressure area through the air inlet pipe, and the sediment at the bottom of the cast-in-place pile hole is discharged out of the cast-in-place pile hole through the guide pipe under the action of the pressure difference between the atmospheric pressure and the negative pressure area. The sediment is discharged through the pipe top under the effect of negative pressure zone and forms reverse circulation's discharge mode, and under the prerequisite that pipe diameter and atmospheric pressure and negative pressure zone's pressure differential satisfied requirement, the discharge of sediment does not receive the influence of sediment granule size, can discharge outside the bored concrete pile hole completely for bored concrete pile hole bottom sediment thickness and mud sand content satisfy the design specification requirement, and then improve concrete pile body quality.

Referring to fig. 1 to 6, the cast-in-place pile hole cleaning device provided in this embodiment mainly includes: a conduit 10, an air inlet pipe 20 and a negative pressure generating device 30.

Guide tube 10 has a bottom end 11 sunk into bored concrete pile hole 100 and a top end 12 exposed outside bored concrete pile hole 100, and bottom end 11 of guide tube 10 is spaced apart from sediment 200 at the bottom of bored concrete pile hole 100 by a first predetermined distance h 1. Specifically, the bottom end 11 and the top end 12 of the catheter 10 are formed as ports, and the interior of the catheter 10 is formed as a channel which is communicated with the ports of the bottom end 11 and the top end 12 of the catheter 10. The bottom end 11 of the guide tube 10 is submerged in the mud-water mixture at the bottom of the hole, but is spaced apart from the sediment 100 at the bottom of the hole by a first predetermined distance h1, and the top end 12 of the guide tube 10 is exposed from the top end of the bored concrete pile hole 100 to the outside of the bored concrete pile hole 100. One end of the air inlet pipe 20 is connected to the bottom wall of the catheter 10 at a second predetermined distance h2 from the bottom end 11 of the catheter 10, and the other end of the air inlet pipe 20 is connected to the negative pressure generating device 30, wherein the negative pressure generating device 30 is configured to generate a negative pressure region N (shown in fig. 3) at the bottom of the catheter 10 through the air inlet pipe 20, so that the sediment at the bottom of the hole 100 of the bored concrete pile is discharged out of the bored concrete pile hole 100 through the top end 12 of the catheter 10 through the negative pressure region N.

Specifically, the negative pressure generating device 30 generates high-pressure gas by means of air compressed air, the high-pressure gas is delivered to the bottom of the conduit 10 through the air inlet pipe 20, meanwhile, the high-pressure gas and the muddy water mixture in the conduit 10 form a plurality of small bubbles, the small bubbles are subjected to upward buoyancy of the muddy water mixture and drive the muddy water mixture to move upwards, the pressure is gradually reduced in the ascending process, the volume is gradually increased, the density of the air and muddy water mixture in the air inlet pipe 20 is smaller than that of the muddy water mixture in the bottom space of the conduit 10, and thus a negative pressure area N is formed in the bottom space area in the conduit 10. Under the action of the pressure difference between the atmospheric pressure and the negative pressure region N, the mud-water mixture in the bottom space of the conduit 10 is continuously supplemented to the negative pressure region N, and the sediment 200 (solid particles) at the bottom of the hole is driven by the mud-water mixture to enter the conduit 10 through the port at the bottom end 11 of the conduit 10 and is discharged out of the bored concrete pile hole 100 along with the top end 12 of the conduit 10. The circulation is repeated in such a way that the mixture of sediment 200 and mud at the bottom of the bored concrete pile hole 100 rises along the guide pipe 10 under the action of the negative pressure region N, and is supplemented to the negative pressure region N. Meanwhile, in order to prevent the water head of the mud-water mixture at the bottom of the bored pile hole 100 from being excessively small, as shown in fig. 3, a good quality mud-water mixture 300 (having a low sand content) may be supplemented into the bored pile hole 100 by a mud pump.

In one embodiment, after the sediment is discharged out of the bored concrete pile hole 100 through the guide pipe 10, a feed hopper may be connected to a port of the top end 12 of the guide pipe 10 to focus on the concrete in the bored concrete pile hole, thereby improving construction efficiency.

In this application, a casing 101 is further disposed on the wall of the bored concrete pile hole 100, the guide pipe 100 is submerged in the casing 101, and before the guide pipe 100 is submerged in the casing 101, a reinforcement cage for forming a bored concrete pile with concrete is located below the casing 101. The main function of the casing 101 is to fix the pile position of the bored pile hole 100, guide the drilling direction, isolate surface water to prevent the surface water from flowing into the borehole, and protect the bored pile hole from collapsing.

In one embodiment, the conduit 10 is made of steel pipe, and the air inlet pipe 20 is made of plastic hose, which is resistant to high pressure gas. In order to avoid the process of the lower conduit 10 and the air inlet pipe 20, the air inlet pipe 20 is scraped on the reinforcement cage, and one end and the other end of the air inlet pipe 20 are fixed on the wall of the conduit 10 in an iron wire binding manner.

To facilitate the installation of the air inlet pipe, as shown in fig. 6, the cast-in-place pile hole cleaning equipment provided by the present application further includes: a conduit fitting 50, a first port 51 of the conduit fitting 50 being connected to the bottom wall of the conduit 10 at a second predetermined distance h2 from the bottom end 11 of the conduit 10, and a second port 52 of the conduit fitting 50 being connected to one end of the air inlet conduit 20, thereby connecting the air inlet conduit 20 to the bottom wall of the conduit 10. The first port 51 can be fixed on the wall of the conduit 10 by welding and is communicated with the inside of the conduit 10, and one end of the air inlet pipe 20 can be sleeved on the second port 52 and fixed on the second port 52 by binding with iron wires.

Of course, in other embodiments, the connection modes between the first port 51 and the bottom tube wall of the catheter 10 and between the second port 52 and one end of the air inlet tube 20 may also be partially or completely by using a quick coupling, so as to reduce the installation difficulty and improve the installation and removal efficiency.

In one embodiment, the aforementioned catheter adapter 50 includes: a first pipe section 53 and a second pipe section 54, one end of the first pipe section 53 being connected to the pipe wall of the conduit 10 at a position spaced apart from the bottom end 11 of the conduit 10 by a second predetermined distance h2, the other end of the first pipe section 53 being connected to one end of the second pipe section 54, the other end of the second pipe section 54 being connected to one end of the air inlet pipe 20, whereby one end of the first pipe section 53 is formed as the aforementioned first port 51 and the other end of the second pipe section 54 is formed as the aforementioned second port 54.

In the present embodiment, the first pipe section 53 extends from the bottom end 11 of the conduit 10 to the top end 12 thereof and is inclined outward, and the second pipe section 54 is parallel to the conduit 10, so as to form the conduit joint 50 in a V shape, thereby facilitating the installation of the air inlet pipe 20.

In the above embodiment, the bottom end 11 of the guide tube 10 is spaced apart from the sediment at the bottom of the bored concrete pile hole 100 by the first predetermined distance h1, so that the large-particle sediment can be prevented from blocking the end opening of the bottom end 11 of the guide tube 10. According to practical construction experience, the first preset distance h1 is between 200mm and 300 mm.

As shown in fig. 3, the negative pressure region N is formed below the position where the air inlet tube 20 is installed in the catheter 10, that is, the height of the negative pressure region N is the second preset distance h 2. In order to ensure that the negative pressure region N forms a sufficient pressure difference with the atmospheric pressure, the second preset distance h2 is between 200mm and 300mm according to practical construction experience.

In one embodiment, the aforementioned duct 10 takes the form of a segment, and in particular, the duct 10 comprises: thereby a plurality of bodys 13, all bodys 13 end to end in proper order form pipe 10, particularly, the junction of last body and next body can set up the external screw thread, and the junction of next body and last body can set up the internal thread of adaptation in this external screw thread, is connected through external screw thread and internal thread spiro union's mode between last body and the next body. As shown in fig. 1, the bottom end of the bottommost tube body 13 'is formed as the bottom end 11 of the aforementioned catheter 10, and the top end of the topmost tube body 13' is formed as the top end 12 of the aforementioned catheter 10.

The lengths of the tubes 13 may be the same or different. In this embodiment, the lengths of the tubes 13 are the same, so that the tubes are formed by sectional tubes, which facilitates the installation, disassembly, transportation, and production of the tubes.

In one embodiment, and with continued reference to FIG. 6, the end of the bottom end 11 of the catheter 10 is in the form of a beveled mouth, the tip of which is formed as the end of the bottom end 11 of the catheter 10, i.e., the first predetermined distance h1 is the distance separating the tip of the beveled mouth from sediment at the bottom of the bore of the bored concrete pile, and the second predetermined distance h2 is the distance separating the connection of the air inlet tube 20 to the wall of the catheter 10 and the tip of the beveled mouth.

In the above embodiment, the angle of the bevel is preferably 45 °, so that the area of the port at the bottom end of the conduit can be increased to facilitate the discharge of large-particle sediments.

The negative pressure generating device 30 includes: an air storage tank 31 and an air compressor 32, wherein the air compressor 32 is usually 9m³-20m³The air compressor 32 compresses air into high-pressure gas, the air tank 31 stores the high-pressure gas, and the other end of the intake pipe 20 is connected to the air tank 31.The gas tank 31 is provided with a gas supply valve 311 and a pressure relief valve 312, the other end of the gas inlet pipe 20 is connected to the gas tank 31 through the gas supply valve 311, and the pressure relief valve 312 is used to relieve the gas tank 31 when the pressure of the high-pressure gas stored in the gas tank 31 exceeds the maximum pressure that the gas tank 31 can bear. When the pressure of the high-pressure gas stored in the gas tank 31 reaches a desired pressure, the gas supply valve 311 is opened, and the high-pressure gas is supplied to the bottom region in the guide duct 10 through the gas supply pipe 20, thereby forming a negative pressure region N in the bottom region in the guide duct 10.

Before air is supplied to the duct 10 through the air inlet pipe 20, the air supply valve 311 is closed.

In this embodiment, the clear hole equipment of bored concrete pile that this application provided still includes: the sand filter 40 is used for filtering discharged sediments to form sand 210, and the sand 210 is piled up and then cleaned to a muck piling area by using transfer equipment, so that the aim of secondary utilization is fulfilled. As shown in fig. 1-3, the sand filter 40 has a slurry inlet 41 and a slurry outlet 42, the slurry inlet 41 is connected with the end of the top end 12 of the conduit 10, sediment and the carried mud-water mixture enter the sand filter 40 through the slurry inlet 41, the sediment and the carried mud-water mixture are filtered by the sand filter 40 to form sand 210, and the formed sand 210 is discharged and accumulated through the slurry outlet 42.

Of course, in other embodiments, after the sediment and the carried-out slurry mixture are discharged out of the bored concrete pile hole 100 through the end of the top end 12 of the guide pipe 10, the sediment and the carried-out slurry mixture can be collected by a collection tank, and sand and gravel can be separated by settling in the collection tank.

Bored concrete pile hole 100 is vertically arranged, and therefore, guide pipe 10 is also vertically arranged, and sand filter 40 is installed on the ground, and in this application, in order to facilitate connection of guide pipe 10 and sand filter 40, the bored concrete pile hole cleaning apparatus provided in this embodiment further includes: the connecting elbow 60, as shown in fig. 5, has one end 61 of the connecting elbow 60 connected to the top end 12 of the conduit 10, and the other end 62 of the connecting elbow 60 connected to the slurry inlet 41 of the sand filter 40. In the preferred embodiment, the connection between one end of the connecting elbow 60 and the top end 12 of the conduit 10 and the connection between the other end 62 of the connecting elbow 60 and the slurry inlet 41 of the sand filter 12 are all connected in a threaded manner, so that the assembly and disassembly are convenient.

When the sediment and the carried mud-water mixture enter the connecting elbow 60, the connecting elbow is easy to be blocked due to the bending, therefore, the connecting elbow 60 is also provided with an elbow cover 63 which can be opened or closed, and the blocked part can be cleaned by opening the elbow cover 63.

In fig. 3, a vertical downward arrow indicates a flow direction of high-pressure gas in the gas inlet pipe 20, a vertical upward arrow in the bottom of the bored concrete pile hole 100, and a vertical upward arrow in the pipe 10 indicate a flow direction of the sediment 200, an arrow inclined from the left side to the left lower side of the sand filter 40 indicates a discharge direction of the sand 210 formed after filtration, and an arrow inclined from the top of the casing 100 to the left lower side indicates a high-quality muddy water mixture 300 replenished into the bored concrete pile hole 100 by the slurry pump.

The application provides a clear hole equipment of bored concrete pile use as follows:

after the drilling process of the cast-in-place pile hole is completed, a reinforcement cage is arranged below the cast-in-place pile hole, after the lower part of the reinforcement cage enters the cast-in-place pile hole, the actual hole depth (the depth above the sediment) is measured, and the thickness of the sediment at the bottom of the hole is obtained according to the difference between the hole depth (the depth of the drill rod which enters the lower part) of the cast-in-place pile hole and the actual hole depth.

Connecting one end of the air inlet pipe to the guide pipe, binding and fixing the air inlet pipe on the guide pipe, putting the guide pipe into the hole of the cast-in-place pile, and enabling the bottom end of the guide pipe to be away from the sediment at the bottom of the hole by a first preset distance.

The air inlet pipe is connected to an air supply valve of the air storage tank, and the air inlet valve is in a closed state at the moment.

The port at the top end of the conduit is connected with one end of the connecting elbow, and the other end of the connecting elbow is connected with the slurry inlet of the sand filter.

Starting the air compressor, when the high-pressure gas in the gas storage tank meets the use requirement, starting the gas supply valve, conveying the high-pressure gas to the bottom space region in the guide pipe through the gas inlet pipe by the high-pressure gas, forming a plurality of small bubbles by the high-pressure gas and the muddy water mixture in the guide pipe, driving the muddy water mixture to move upwards by the small bubbles under the upward buoyancy of the muddy water mixture, gradually reducing the pressure in the ascending process, gradually increasing the volume, and enabling the density of the air and muddy water mixture in the gas inlet pipe to be smaller than that of the muddy water mixture in the bottom space of the guide pipe, thereby forming a negative pressure region in the bottom space region in the. Under the action of the pressure difference between the atmospheric pressure and the negative pressure area, the mud-water mixture in the bottom space of the guide pipe is continuously supplemented to the negative pressure area, and sediment (solid particles) at the bottom of the hole enters the guide pipe through the port at the bottom end of the guide pipe under the driving of the mud-water mixture and is discharged out of the hole of the cast-in-place pile along with the top end of the guide pipe. The circulation is carried out in such a way, so that the mixture of sediment and mud at the hole bottom of the hole of the cast-in-place pile rises along the guide pipe under the action of the negative pressure area and is supplemented to the negative pressure area. Meanwhile, in order to prevent the water head of the mud-water mixture at the bottom of the hole of the cast-in-place pile from being too small, the mud-water mixture with high quality (low sand content) can be supplemented into the cast-in-place pile hole through a mud pump.

And in the hole cleaning process, the actual hole depth is continuously measured, the sediment thickness is estimated, and the distance between the bottom end of the guide pipe and the sediment is always kept at a first preset distance.

And after the precipitate is completely removed, or after the thickness of the precipitate meets the design and specification requirements, the continuous hole cleaning operation can be carried out within the time of the concrete, so that the precipitate particles are prevented from sinking.

When the concrete arrives on the site and the pouring condition is met, the air supply valve is closed, the port at the top end of the guide pipe and the guide pipe joint are immediately detached (approximately 10 minutes), and the feed hopper is installed at the port at the top end of the guide pipe, so that the hole cleaning state is changed into the pouring state.

After the pouring is finished, when the guide pipe is dismantled, the air inlet pipe and the guide pipe are synchronously separated, washed clean and stored for later use.

In summary, in the hole cleaning device for a cast-in-place pile provided by this embodiment, the negative pressure generating device generates a negative pressure region at the bottom of the conduit through the air inlet pipe, and discharges the sediment at the bottom of the hole of the cast-in-place pile out of the hole of the cast-in-place pile through the conduit under the action of the pressure difference between the atmospheric pressure and the negative pressure region. The sediment is discharged through the pipe top under the effect of negative pressure zone and forms reverse circulation's discharge mode, and under the prerequisite that pipe diameter and atmospheric pressure and negative pressure zone's pressure differential satisfied requirement, the discharge of sediment does not receive the influence of sediment granule size, can discharge outside the bored concrete pile hole completely for bored concrete pile hole bottom sediment thickness and mud sand content satisfy the design specification requirement, and then improve concrete pile body quality. The equipment is simple to manufacture and convenient and flexible to use.

Meanwhile, the hole cleaning of the cast-in-place pile hole cleaning equipment is thorough, the thickness of sediment at the bottom of the hole can be smaller than the design requirement of 20cm, and the hole cleaning requirement can be met in a short time compared with the traditional hole cleaning mode. And, the hole cleaning state can be changed into the pouring state within 10 minutes.

The foregoing is a more detailed description of the present application in connection with specific embodiments thereof, and it is not intended that the present application be limited to the specific embodiments thereof. It will be apparent to those skilled in the art from this disclosure that many more simple derivations or substitutions can be made without departing from the inventive concepts herein.

Claims (10)

1. An apparatus for cleaning holes in cast-in-place piles, comprising: the device comprises a conduit, an air inlet pipe and a negative pressure generating device; the guide pipe is provided with a bottom end which is sunk into the cast-in-place pile hole and a top end which is exposed out of the cast-in-place pile hole, and a first preset distance is reserved between the bottom end of the guide pipe and sediment at the bottom of the cast-in-place pile hole; one end of the air inlet pipe is connected to the position, on the bottom pipe wall of the conduit, of a second preset distance away from the bottom end of the conduit, and the other end of the air inlet pipe is connected with the negative pressure generating device; the negative pressure generating device is used for generating a negative pressure area at the bottom of the conduit through the air inlet pipe so as to discharge the sediments from the top end of the conduit through the negative pressure area.

2. The cast-in-place pile hole cleaning equipment as claimed in claim 1, further comprising: and the sand filter is provided with a slurry inlet connected with the top end of the guide pipe and used for filtering discharged sediments.

3. The cast-in-place pile hole cleaning equipment as claimed in claim 2, further comprising: one end of the connecting elbow is connected with the top end of the guide pipe, and the other end of the connecting elbow is connected with a slurry inlet of the sand filter; the connecting elbow is also provided with an openable or closable elbow blank cap.

4. An apparatus for cleaning a hole in a cast-in-place pile as defined in claim 1, wherein the port at the bottom end of said guide tube is a beveled opening, the tip of said beveled opening being formed as the bottom end of said guide tube.

5. A cast-in-place pile hole-cleaning apparatus as claimed in claim 1, wherein said air-intake tube is fixed to the wall of said conduit between one end and the other end thereof.

6. The cast-in-place pile hole cleaning equipment as claimed in claim 1, further comprising: and a first port of the conduit joint is connected to the position, on the bottom pipe wall of the conduit, at a second preset distance from the bottom end of the conduit, and a second port of the conduit joint is connected with one end of the air inlet pipe.

7. An apparatus for cleaning a hole in a cast-in-place pile as defined in claim 6, wherein said conduit fitting comprises: the gas inlet pipe comprises a first pipe section and a second pipe section, wherein one end of the first pipe section is connected to the pipe wall of the guide pipe at a second preset distance from the bottom end of the guide pipe, the other end of the first pipe section is connected with one end of the second pipe section, the other end of the second pipe section is connected with one end of the gas inlet pipe, one end of the first pipe section is formed into a first port, and the other end of the second pipe section is formed into a second port; the length direction of the first pipe section extends from the bottom end of the guide pipe to the top end of the guide pipe and inclines outwards, and the length direction of the second pipe section is parallel to the length direction of the guide pipe.

8. The apparatus for cleaning holes of cast-in-place piles as set forth in claim 1, wherein the guide tube includes: the plurality of pipe bodies are sequentially connected end to end; the bottom end of the bottommost tube body is formed as the bottom end of the catheter, and the top end of the topmost tube body is formed as the top end of the catheter.

9. An apparatus for cleaning holes in cast-in-place piles as claimed in claim 1, wherein the first predetermined distance is between 200mm and 300 mm.

10. An apparatus for cleaning holes in cast-in-place piles as claimed in claim 1, wherein the second predetermined distance is between 200mm and 300 mm.

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