CN109778847B - Construction method and device of concrete cast-in-place pile - Google Patents

Construction method and device of concrete cast-in-place pile Download PDF

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CN109778847B
CN109778847B CN201910211363.2A CN201910211363A CN109778847B CN 109778847 B CN109778847 B CN 109778847B CN 201910211363 A CN201910211363 A CN 201910211363A CN 109778847 B CN109778847 B CN 109778847B
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pile
hole
guniting
preset
pressure
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CN109778847A (en
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裴晓峰
祝波
陈永顺
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Pei Juanyi
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Pei Juanyi
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Abstract

The invention discloses a construction method and a device of a concrete cast-in-place pile, which are technically characterized in that a preset annular conical cavity is formed in the hole forming process of a drilling machine, a drill hole and one or more annular conical cavities at intervals along a pile hole are formed after the final hole is formed, the pile hole becomes a pile body after hole cleaning, steel reinforcement cage hoisting, secondary hole cleaning and concrete pouring, and the cavity becomes a tray body. And (4) presetting an annular conical cavity, and pouring concrete into the final hole to form a pile body. After the concrete reaches the preset strength, continuous multi-point and mutual superposition and/or full distribution of high-pressure guniting are carried out in the preset height range of the lower part of the tray body and/or the lower part of the pile bottom, the guniting enables the grout and soil body to be mixed to form cement soil which is connected into a whole, and an integral consolidation body is formed after hardening to support the tray body (comprising a plurality of tray bodies) and/or the pile bottom (comprising a group of pile bottoms), so that the bearing capacity of the pile foundation is greatly improved, and the settlement and differential settlement are remarkably reduced.

Description

Construction method and device of concrete cast-in-place pile
[ technical field ] A method for producing a semiconductor device
The invention relates to a construction method of a concrete cast-in-place pile in the field of civil engineering, in particular to a concrete cast-in-place pile, wherein a pile body is provided with a single or a plurality of disc bodies, and grouting is performed below a pile bottom in a high-pressure injection mode under the disc bodies when no disc body exists so as to form a force bearing platform.
[ background of the invention ]
In order to solve the problems that the conventional bored concrete cast-in-place pile bottom sediment is difficult to treat and the friction resistance of a mud-skin interlayer at the periphery of a pile body is low, a disc expanding/disc supporting pile process, a pile bottom and pile periphery pressure grouting process and the like are adopted in the civil engineering practice process. Compared with the conventional cast-in-situ bored pile, the process has the effects of improving the bearing capacity of the single pile, reducing the settlement of the pile foundation, reducing the construction cost and the like, but has obvious defects. For the squeezed branch pile, firstly, a branch pile and a disk are formed by multiple turning and overlapped squeezed expansion, the possibility of squeezing soil into a cavity which is completed in the previous process exists during the second and subsequent squeezed expansion, the integrity and the quality of the finished disk are doubtful, the existing detection means cannot effectively detect the integrity and the quality of the finished disk, and the detection result of the single branch pile and the single disk cannot judge whether the branch pile or the finished disk exists at all; secondly, two sets of equipment are needed in the drilling and extruding processes, and the problems that the construction difficulty is increased, the process efficiency is low, the friction resistance around the pile at the non-extruded and expanded part cannot be enhanced and the like exist. For the grouting process at the bottom and around the pile, the actual controllability is poor, the actual diffusion range and direction of the grout cannot be controlled and guaranteed, the uniformity of the grouting result has the problem that the grouting cannot be controlled and guaranteed fundamentally, and as a result, the bearing capacity and the sedimentation deformation discreteness of adjacent piles are large.
[ summary of the invention ]
Aiming at the defects, the invention provides a construction method and a device of a concrete cast-in-place pile.
A construction method of a concrete cast-in-place pile is characterized by comprising the following steps:
constructing pile holes by using a drilling machine according to a pre-designed pile structure;
when the ring-shaped conical cavity is preset in the pre-designed pile structure, a forming device is used for forming the ring-shaped conical cavity at the preset elevation of the pile hole in the construction process of the pile hole, and then the drilling machine forms a hole to a final hole;
when the ring-free conical cavity is preset in the pre-designed pile structure, the drilling machine directly performs hole forming to a final hole;
cleaning the pile hole, hoisting a reinforcement cage and a guide pipe to the pile hole, cleaning the pile hole for the second time, pouring concrete into the pile hole to a preset elevation, so that the pile hole and/or the annular conical cavity are/is filled with the concrete, the pile hole becomes a pile body after the concrete is hardened, and the annular conical cavity becomes a disc body;
and after the concrete reaches the preset strength, carrying out continuous multi-point and mutually overlapped high-pressure guniting and/or full high-pressure guniting on soil in the preset elevation range of the lower part of the tray body and/or the lower part of the pile bottom of the pile body by using a high-pressure jet grouting device.
Optionally, the ring-shaped conical cavity is a continuous, uninterrupted or discontinuous cavity which surrounds the outer side of the pile hole and is communicated with the pile hole into a whole, and is coaxial with the pile hole;
the elevation, the cavity size and the number of the annular conical cavity are set according to the design requirements of the pile hole.
Optionally, the annular conical cavity is formed in a rotary cutting mode and/or a squeezing mode.
Optionally, the annular conical cavity is internally provided with or without steel bars or section steel.
Optionally, the high-pressure guniting adopts a single-pipe method or a multi-pipe method of rotary spraying or directional spraying or swinging spraying;
the guniting material of the high-pressure guniting comprises and is not limited to water, compressed gas, cement additives or admixtures;
the operating point, the guniting amount, the spraying pressure, the guniting radius and range, the guniting range stacking rate, the drill rod lifting/descending speed and the rotating speed of the high-pressure guniting are preset or adjusted according to the change of the actual physical property of the soil body.
Optionally, continuous multi-point mutually-superposed high-pressure guniting is carried out within a preset height range of the lower part of the tray body, guniting operation points are preset positions which surround the pile body and are outside the projection surface of the tray body, and the number of the operation points is more than 1; or before the construction of the pile hole is carried out by using a drilling machine according to the pre-designed pile structure, carrying out continuous multi-point and mutually overlapped high-pressure guniting on the preset height range of the pile hole in advance, after the cement soil in the height range reaches the preset strength, carrying out the construction of the pile hole by using the drilling machine according to the pre-designed pile structure and carrying out annular conical cavity forming in the preset height range;
the high-pressure guniting process comprises the steps that the operating points are sequentially and continuously guniting or the operating points are guniting simultaneously, and the guniting ranges of the adjacent operating points are overlapped according to a preset overlapping rate; the continuous multi-point and mutually overlapped high-pressure guniting connects the cement soil mixed at the lower part of the single disc body into a whole, and the cement soil becomes an integral consolidation body supporting the single disc body after hardening.
Optionally, it is many to many pile body or grouted pile are a plurality of with the elevation the continuous multiple spot of predetermineeing the operation point and the full cloth shotcrete that superposes each other are implemented to the disk body lower part within the predetermined height range, will many pile body or grouted pile are a plurality of with the elevation soil cement of disk body lower part links into an organic whole, forms one and contains a plurality ofly including single set lower part soil cement soil and bigger soil cement body, become after the soil cement hardening and hold in the palm many the solid body cushion cap of a plurality of disks of pile or grouted pile with the elevation.
Optionally, when the ringless conical cavity/disc body is preset, continuous multi-point and mutually-overlapped high-pressure guniting is carried out on the lower part of the pile bottom of the pile body within a preset height range, the guniting operation points are preset positions which surround the pile body and are outside the projection plane of the pile body, the number of the operation points is more than 1, and the guniting process is that the operation points are sequentially and continuously guniting or the operation points are guniting simultaneously;
overlapping the guniting ranges of the adjacent operating points according to a preset overlapping rate;
the continuous multi-point and mutually overlapped high-pressure guniting connects the cement soil at the lower part of the pile bottom of the single pile body into a whole, and the cement soil becomes a solid body for supporting the pile bottom after hardening.
Optionally, when the ringless conical cavity/disc body is preset, continuous multi-point and mutually overlapped full high-pressure guniting of preset operation points is implemented in a preset height range of the lower part of the pile bottom with the same standard height of the plurality of pile bodies or grouped piles, cement soil at the lower parts of the pile bottoms of the plurality of pile bodies or grouped piles is connected into a whole to form a larger cement soil body containing the cement soil at the lower parts of the pile bottoms of the plurality of pile bodies or grouped piles, and the cement soil body becomes a solid bearing platform for supporting the plurality of pile bodies or grouped piles after being hardened.
The invention also provides construction equipment of the concrete cast-in-place pile, which is characterized in that the construction equipment of the concrete cast-in-place pile comprises a hole forming drill, an annular conical cavity former and a high-pressure jet grouting device;
the hole-forming drilling machine is used for constructing pile holes according to a pre-designed pile structure;
the annular conical cavity former is used for forming an annular conical cavity at the preset elevation of the pile hole;
the high-pressure jet grouting device is used for performing continuous multi-point and mutually overlapped high-pressure guniting and/or full high-pressure guniting on soil in a preset elevation range at the lower part of the tray body and/or the lower part of the pile bottom of the pile body.
The invention has the beneficial effects that: the invention presets the disk body and forms the consolidation material/consolidation body cushion cap process in the disk body or lower part of the pile body, especially form the consolidation material/consolidation body cushion cap process in the disk body or lower part of the pile body, will produce the important technical innovation to the pile foundation construction in the civil engineering field, not only can greatly high single pile, many piles or group of piles bearing capacity, and can reduce even remove the settlement difference and settlement problem caused by this in the trade apparently, and the cavity forming process and the shotcrete process are not crossed each other, can obviously improve the work efficiency. The whole process can also obviously reduce the construction cost and shorten the construction period more reasonably.
[ description of the drawings ]
Fig. 1 is a flow chart of a method according to a first embodiment of the method for constructing a cast-in-place concrete pile according to the present invention.
Fig. 2 is a method flowchart of a second embodiment of the method for constructing a concrete cast-in-place pile according to the present invention.
Fig. 3 is a method flowchart of a third embodiment of a method for constructing a concrete cast-in-place pile according to the present invention.
Fig. 4 is a flowchart of a fourth method of the present invention.
Fig. 5 is a fifth apparatus configuration diagram of the concrete cast-in-place pile construction apparatus according to the present invention.
Fig. 6 is a schematic view of a drilling and rotary cutting integrated machine of construction equipment of the cast-in-place concrete pile provided by the invention.
FIG. 7 is a schematic view of a single-disk lower high-pressure guniting consolidation provided by the invention.
FIG. 8 is a schematic view of a multi-disk lower high-pressure guniting consolidation provided by the present invention.
[ detailed description ] embodiments
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example one
Referring to fig. 1, a method for constructing a concrete cast-in-place pile includes:
and S101, constructing a pile hole by using a drilling machine according to the pre-designed pile structure.
Before the construction of the pile hole is carried out by a drilling machine according to the pre-designed pile structure, continuous multi-point and mutually overlapped high-pressure guniting is carried out in advance in a preset height range of the preset elevation of the pile hole, and after the cement soil in the height range reaches the preset strength, the construction of the pile hole is carried out by the drilling machine according to the pre-designed pile structure.
According to the pre-designed pile structure, the processes of pile hole positioning, pile casing embedding, drill positioning and the like are carried out before hole forming.
The drilling machine hole forming process is slurry wall protection hole forming or other forms of non-slurry wall protection hole forming; the hole-forming drill is an integrated device formed by combining a drill or a drill and a pile hole ring conical cavity former, as shown in fig. 6. The control and operation mode is automatic or manual operation and control mode.
S102, when a ring-shaped conical cavity is preset in the pre-designed structure of the pile, a forming device is used for forming the ring-shaped conical cavity at the preset elevation of the pile hole in the construction process of the pile hole, and then the drilling machine forms a hole to a final hole.
Drilling a hole by a drilling machine, when the hole is drilled to the preset ring conical cavity position elevation, carrying out rotary cutting towards the outer side direction of the pile hole to form a pre-designed ring conical cavity, and continuously forming the hole downwards after the rotary cutting of the cavity is finished; or a pre-designed annular conical cavity can be formed by adopting a mode of extruding towards the outer side of the pile hole. Fig. 6 is a schematic view of the pile hole rotary cutting machine.
The annular conical cavity is a continuous or discontinuous cavity which surrounds the outer side of the pile hole and is communicated with the pile hole into a whole, and is in coaxial relation with the pile hole. The elevation, the size and the number of the annular conical cavities are designed in advance. When the actual physical properties of the soil body where the annular conical cavity is located change, the actual set elevation, the size and the number of the cavities of the annular conical cavity are recalculated and adjusted according to the actual detection result. The number of the annular conical cavities is more than or equal to 1, namely, one annular conical cavity (the part below the cavity is a pile root) is arranged at a certain distance from the bottom of the pile hole as the basic number 1, and the cavities from top to bottom along the pile hole are not necessarily at equal intervals.
And (5) forming each annular conical cavity in sequence while continuing to form the hole downwards until the hole is drilled to the designed pile bottom elevation and the final hole is formed.
S103, right the pile hole is cleared the hole, hangs and puts steel reinforcement cage and pipe and arrives the pile hole, it is right the pile hole carries out the clear hole of second time, it is right pile hole cast-in-place concrete to predetermined elevation, makes the pile hole with the annular cone shape cavity is sufficient concrete, after the concrete hardening the pile hole becomes the pile body, the annular cone shape cavity becomes the disk body.
The material, manufacture, processing and quality requirements of the reinforcement cage and the requirements of the concrete on the components, the proportion, the quality and the strength (including the preset strength) are all designed in advance.
After primary hole cleaning, the drilling machine keeps a rotating state but does not drill, and aims to crush and clean large soil mass remained in the hole and adjust the specific gravity of the slurry; and lifting the drilling machine, detecting the pile hole, and hoisting the reinforcement cage and the guide pipe after the detection is qualified. At the same elevation of the steel reinforcement cage and the hole inner ring conical cavity, movable steel bars or section steel are arranged or not arranged according to the size of the counter force of the tray body.
And (5) carrying out secondary hole cleaning, and cleaning sediments generated when the reinforcement cage is hoisted. After primary hole cleaning, steel bar cage hoisting to a set elevation, guide pipe hoisting and secondary hole cleaning are completed according to a preset program, concrete is poured to the set elevation at one time, and when the annular conical cavity is preset, the concrete is filled in the whole pile hole and all the annular conical cavities.
And S104, after the concrete reaches the preset strength, carrying out continuous multi-point and mutually overlapped high-pressure guniting and/or full high-pressure guniting on the soil body within the preset elevation range of the lower part of the tray body by using a high-pressure jet grouting device.
When the strength of the pile body concrete reaches the preset strength or above, high-pressure guniting can be carried out on the lower part of the plate body.
The slurry spraying mode is preset to be high-pressure or ultrahigh-pressure jet grouting, and a single-pipe method or a multi-pipe method of rotary jet, directional jet or swing jet can be adopted. Wherein the guniting material comprises, but is not limited to, water, compressed gas, cement additives or admixtures. The operating point, the slurry spraying amount, the spraying pressure, the slurry spraying radius and range, the slurry spraying range superposition rate, the drill rod lifting/descending speed and the rotating speed of the high-pressure slurry spraying are all preset or adjusted according to the change of the actual physical properties of the soil body. The high-pressure or ultrahigh-pressure injection grouting device is a complete set of high-pressure injection machine (such as a high-pressure rotary injection machine), and the control and operation mode of the high-pressure or ultrahigh-pressure injection grouting device is an automatic and/or manual operation and control mode.
And (3) implementing continuous multi-point mutually-superposed high-pressure guniting within a preset height range of the lower part of a single disc body, wherein guniting operation points are preset positions which surround the pile body and are outside the projection surface of the disc body, and the number of the operation points is not less than 1. The slurry spraying process is that the operation points sequentially and continuously spray slurry or all the operation points spray slurry simultaneously, and the slurry spraying ranges of the adjacent operation points are overlapped according to a preset overlapping rate. The continuous multi-point and mutually overlapped high-pressure guniting connects the cement soil mixed at the lower part of the single disc body into a whole, and the cement soil becomes an integral consolidation body supporting the single disc body after hardening. As shown in fig. 7, P41 is the lower guniting reinforcement body of the tray body, P42 is the bearing tray body, and P43 is the main pile body.
Example two
Referring to fig. 2, the present embodiment adds the following steps on the basis of the first embodiment:
s105, to many pile body or a plurality of grouts with the elevation the continuous multiple spot of predetermineeing the operating point and the full spread shotcrete that superposes each other are implemented to the disk body lower part within the predetermined height range, will many pile body or a plurality of grouts with the elevation soil cement of disk body lower part is even as an organic whole, forms one and contains a plurality ofly including single-disk lower part soil cement soil and bigger soil cement body, becomes after the soil cement hardening and holds in the palm many the solid body cushion cap of a plurality of disk bodies of pile with the elevation.
For multiple piles or grouped piles, continuous multi-point mutual superposition full-distribution high-pressure guniting can be implemented within the preset height range of the lower parts of a plurality of disc bodies with the same elevation according to the preset design, cement soil at the lower parts of the plurality of disc bodies with the same elevation of the multiple piles is connected into a whole to form a larger cement soil body containing the cement soil at the lower parts of a plurality of single discs, and the cement soil body becomes a consolidated body bearing platform for supporting the plurality of disc bodies with the same elevation of the multiple piles after being hardened. As shown in fig. 8, P51 is the lower guniting reinforcement body of the tray body, P52 is the bearing tray body, and P53 is the main pile body.
EXAMPLE III
Referring to fig. 3, a method for constructing a concrete cast-in-place pile includes:
s201, pile hole construction is carried out by a drilling machine according to the pre-designed pile structure.
According to the pre-designed pile structure, the processes of pile hole positioning, pile casing embedding, drill positioning and the like are carried out before hole forming.
The drilling machine hole forming process is slurry wall protection hole forming or other forms of non-slurry wall protection hole forming; the hole-forming drilling machine is an integrated device formed by combining the drilling machine or the drilling machine and the pile hole ring conical cavity former, and the control and operation mode of the hole-forming drilling machine is an automatic or manual operation and control mode.
S202, when the ring-free conical cavity is preset in the pre-designed pile structure, the drilling machine directly performs hole forming to a final hole.
And drilling by a drilling machine to form a hole until the hole is drilled to the designed pile bottom elevation and the hole is finished.
S203, right the pile hole is cleared the hole, hangs and puts steel reinforcement cage and pipe and arrives the pile hole, it is right the pile hole carries out the clear hole of second time, it is right pile hole cast-in-place concrete to predetermined elevation, makes the pile hole is full of concrete, behind the concrete hardening the pile hole becomes the pile body.
The material, manufacture, processing and quality requirements of the reinforcement cage and the requirements of the concrete on the components, the proportion, the quality and the strength (including the preset strength) are all designed in advance.
After primary hole cleaning, the drilling machine keeps a rotating state but does not drill, and aims to crush and clean large soil mass remained in the hole and adjust the specific gravity of the slurry; and lifting the drilling machine, detecting the pile hole, and hoisting the reinforcement cage and the guide pipe after the detection is qualified.
And (5) carrying out secondary hole cleaning, and cleaning sediments generated when the reinforcement cage is hoisted. After primary hole cleaning, steel bar cage hoisting to set elevation, guide pipe hoisting and secondary hole cleaning are completed according to a preset program, concrete is poured to set elevation in one step.
And S204, after the concrete reaches the preset strength, carrying out continuous multi-point and mutually overlapped high-pressure guniting and/or full high-pressure guniting on the soil body in the preset elevation range of the lower part of the pile bottom of the pile body by using a high-pressure injection grouting device.
When the strength of the pile body concrete reaches the preset strength or above, the lower part of the bottom of the pile body can be subjected to high-pressure guniting.
The slurry spraying mode is preset to be high-pressure or ultrahigh-pressure jet grouting, and a single-pipe method or a multi-pipe method of rotary jet, directional jet or swing jet can be adopted. Wherein the guniting material comprises, but is not limited to, water, compressed gas, cement additives or admixtures. The operating point, the slurry spraying amount, the spraying pressure, the slurry spraying radius and range, the slurry spraying range superposition rate, the drill rod lifting/descending speed and the rotating speed of the high-pressure slurry spraying are all preset or adjusted according to the change of the actual physical properties of the soil body. The high-pressure or ultrahigh-pressure injection grouting device is a complete set of high-pressure injection machine (such as a high-pressure rotary injection machine), and the control and operation mode of the high-pressure or ultrahigh-pressure injection grouting device is an automatic and/or manual operation and control mode.
And (3) carrying out continuous multi-point mutually-superposed high-pressure guniting within a preset height range of the lower part of the single-pile bottom, wherein guniting operation points are preset positions which surround the pile body and are outside the projection surface of the plate body, and the number of the operation points is not less than 1. The slurry spraying process is that the operation points sequentially and continuously spray slurry or all the operation points spray slurry simultaneously, and the slurry spraying ranges of the adjacent operation points are overlapped according to a preset overlapping rate. The continuous multi-point and mutually overlapped high-pressure guniting connects the cement soil mixed at the lower part of the single disc body into a whole, and the cement soil becomes an integral consolidation body supporting the single disc body after hardening.
Example four
Referring to fig. 4, the present embodiment adds the following steps on the basis of the third embodiment:
s205, to a plurality of pile body or pile group are implemented in the same pile bottom lower part preset height scope of elevation the continuous multiple spot of presetting the operation point and the full cloth high pressure shotcrete of each other, will be a plurality of the soil cement of the pile bottom lower part of pile body or pile group links into an organic whole, forms one and contains a plurality of bigger cement soil body including the pile bottom lower part soil cement of pile body or pile group, becomes after the cement soil body sclerosis to hold a plurality of the solid body cushion cap at the pile bottom of pile body or pile group.
EXAMPLE five
Referring to fig. 5, a construction apparatus for a concrete cast-in-place pile, the construction apparatus comprising: p31 hole-forming drill, P32 ring conical cavity former, P33 high pressure jet grouting device.
1) The P31 hole-forming drill is used for constructing pile holes according to the pre-designed structure of the pile;
2) the P32 annular conical cavity former is used for forming annular conical cavities at the preset elevation of the pile hole;
3) the P33 high-pressure jet grouting device is used for carrying out continuous multi-point and mutually overlapped high-pressure guniting and full high-pressure guniting on soil in a preset elevation range of the lower part of a tray body and the lower part of the pile bottom of a pile body.
The invention presets the disk body and forms the consolidation material/consolidation body cushion cap process in the disk body or lower part of the pile body, especially form the consolidation material/consolidation body cushion cap process in the disk body or lower part of the pile body, will produce the important technical innovation to the pile foundation construction in the civil engineering field, not only can greatly high single pile, many piles or group of piles bearing capacity, and can reduce even except that the settlement difference in the trade and settlement problem caused by this obviously, and the cavity forming process and the shotcrete process are not crossed each other, can obviously improve the work efficiency. The whole process can also obviously reduce the construction cost and shorten the construction period more reasonably.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (5)

1. A construction method of a concrete cast-in-place pile is characterized by comprising the following steps:
before the construction of a pile hole is carried out by a drilling machine according to a pre-designed pile structure, the high-pressure guniting operation of continuous multiple points and mutual superposition is carried out in advance in a preset height range at the preset elevation of the pile hole;
after the cement soil in the preset height range of the preset elevation of the pile hole reaches the preset strength, constructing the pile hole by a drilling machine according to the pre-designed pile structure;
when the ring-shaped conical cavity is preset in the pre-designed pile structure, a forming device is used for forming the ring-shaped conical cavity within a preset height range at the preset elevation of the pile hole in the construction process of the pile hole, and then the drilling machine forms a hole to a final hole;
cleaning the pile hole, hoisting a reinforcement cage and a guide pipe to the pile hole, cleaning the pile hole for the second time, pouring concrete into the pile hole to a preset elevation, so that the pile hole and the annular conical cavity are filled with concrete, the pile hole becomes a pile body after the concrete is hardened, and the annular conical cavity becomes a disc body;
after the concrete reaches the preset strength, carrying out continuous multi-point and mutually overlapped high-pressure guniting and/or full-distribution high-pressure guniting on the soil body within the preset height range at the lower part of the tray body by using a high-pressure jet grouting device;
carrying out continuous multi-point mutually-superposed high-pressure guniting within a preset height range of the lower part of the disc body, wherein guniting operation points are preset positions which surround the pile body and are outside the projection surface of the disc body, and the number of the operation points is more than 1;
the high-pressure guniting process comprises the steps that the operating points are sequentially and continuously guniting or the operating points are guniting simultaneously, and the guniting ranges of the adjacent operating points are overlapped according to a preset overlapping rate; the cement soil mixed by the lower parts of the single disc bodies is connected into a whole by the continuous multi-point and mutually overlapped high-pressure guniting, and the cement soil becomes an integral consolidation body supporting the single disc bodies after being hardened;
the high-pressure guniting adopts a single-pipe method or a multi-pipe method of rotary spraying, directional spraying or swing spraying; the guniting material of the high-pressure guniting comprises and is not limited to water, compressed gas, cement additives or admixtures; the operating point, the guniting amount, the spraying pressure, the guniting radius and range, the guniting range stacking rate, the drill rod lifting/descending speed and the rotating speed of the high-pressure guniting are preset or adjusted according to the change of the actual physical property of the soil body.
2. The method for constructing a concrete cast-in-place pile according to claim 1, wherein the annular tapered cavity is a continuous, uninterrupted or discontinuous cavity surrounding the outside of the pile hole and communicating with the pile hole into a whole, and is coaxial with the pile hole;
the elevation, the cavity size and the number of the annular conical cavity are set according to the design requirements of the pile hole.
3. The method for constructing a concrete cast-in-place pile according to claim 1, wherein the annular conical cavity is formed by rotary cutting and/or extrusion.
4. A method of constructing a cast-in-place concrete pile according to claim 1, wherein reinforcing steel bars or steel sections are optionally provided in the annular conical cavity.
5. The method of constructing a concrete cast-in-place pile according to claim 1,
to many pile shaft or grouted pile are a plurality of with the elevation implement the continuous multiple spot and the full cloth shotcrete of mutual stack of presetting the operation point in the predetermined height range of disk body lower part, will many pile shaft or grouted pile are a plurality of with the elevation cement soil of disk body lower part links into an organic wholely, forms one and contains a plurality ofly including disk body lower part cement soil and bigger cement soil body becomes to hold many behind the cement soil body sclerosis the consolidation body cushion cap of a plurality of disk bodies of pile shaft with the elevation.
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