CN115726360A - Construction method of impact drilling positive circulation cast-in-place pile - Google Patents
Construction method of impact drilling positive circulation cast-in-place pile Download PDFInfo
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Abstract
The invention provides a construction method of a percussion drilling positive circulation cast-in-place pile, which relates to the technical field of cast-in-place pile hole forming construction and comprises the following steps: embedding the pile casing, tamping the foundation at the bottom of the pile casing by replacing and filling clay, and backfilling the clay on the outer wall of the pile casing and tamping the clay in layers; erecting a percussion drill on one side of the protective cylinder, wherein a percussion drill bit of the percussion drill extends into the protective cylinder to drill a hole; a positive circulation slag discharging system is arranged on one side of the protective cylinder and is connected with the impact drill bit; deslagging in a hole drilled by the percussion drill in a positive circulation mode, and enabling slurry to flow upwards and back to enter a positive circulation deslagging system; hoisting a reinforcement cage in the hole, and performing hole cleaning and slurry changing treatment on the hole; and pouring concrete into the holes with the reinforcement cages to form piles, and taking out the pile casings. The invention solves the technical problem that in the prior art, in some rock stratums with poor geology, slag needs to be fished through the slag fishing barrel after the pore is formed, and direct slag discharge cannot be continuously carried out in the drilling process.
Description
Technical Field
The invention relates to the technical field of bored concrete pile hole-forming construction, in particular to a construction method of a percussion drilling positive circulation bored concrete pile.
Background
The red sandstone is easy to disintegrate in the impact footage when meeting water, and collapse accidents are easy to happen during pore forming; aiming at the characteristics of siltstone geology, in the process of impact pore-forming, a large amount of siltstone fragments are easily generated in the bottom of the hole, the siltstone fragments are rapidly precipitated, the pile-forming quality of a subsequent cast-in-place concrete pile is greatly influenced, and the phenomenon of poor quality of the bottom of a pile body can occur.
The device of the sediment at the bottom of the hole of driling is a bailing section of thick bamboo for driving sediment when the engineering construction, and the lower part of a bailing section of thick bamboo is sealed, when salvaging drilling pile bottom sediment, leans on from top to bottom to promote a bailing section of thick bamboo by a wide margin to the sediment at the bottom of the stirring stake, let the sediment suspend to certain height after, fall into a section of thick bamboo from the last mouthful of a section of thick bamboo in, when a section of thick bamboo fill the back, propose to ground, put into the hole again, so operation repeatedly, clear up the sediment at the bottom of the hole.
However, the method has long cycle time and poor slurry making effect of the slurry protecting wall, and particularly has poor hole cleaning effect on the engineering stratum, thereby causing high pile quality control difficulty, lower slurry recycling rate, more serious noise and environmental pollution and inconvenient transportation.
Disclosure of Invention
The invention aims to provide a construction method of a percussion drill positive circulation cast-in-place pile, which aims to solve the technical problem that in the prior art, slag needs to be fished through a slag fishing barrel after pore forming in the pore forming process, and continuous and direct slag discharging cannot be kept in the drilling process.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a construction method for a percussion drilling positive circulation cast-in-place pile, comprising:
embedding a pile casing to a specified depth, replacing and filling clay on the foundation at the bottom of the pile casing for tamping, and filling clay on the outer wall of the pile casing for tamping in a layering manner;
erecting a percussion drill on one side of the protective cylinder, wherein a percussion drill bit of the percussion drill extends into the protective cylinder to drill a hole and advance;
a positive circulation slag discharging system is arranged on one side of the protective cylinder and is synchronously implemented with the impact drill bit, and the head of the positive circulation slag discharging pipe is 1.0m higher than that of the impact drill bit;
deslagging in a hole drilled by the percussion drill in a positive circulation mode, and enabling mud to flow upwards and back to enter the positive circulation deslagging system;
hoisting a reinforcement cage in the hole, and performing hole cleaning and grout changing treatment on the hole;
and pouring concrete into the hole in which the reinforcement cage is placed to form a pile, and taking out the pile casing.
In an optional embodiment of the present invention, burying a casing, tamping filled clay on a foundation at the bottom of the casing, and backfilling clay on an outer wall of the casing and tamping in layers, comprises:
the top of the pile casing is arranged at a position 0.3-0.5 m higher than the ground.
In an optional embodiment of the present invention, a percussion drill is mounted on one side of the casing, and a percussion bit of the percussion drill extends into the casing to perform drilling, including:
the percussion drill performs up-and-down percussion motion in the hole.
In an optional embodiment of the present invention, a positive circulation slag discharging system is disposed on one side of the casing and connected to the percussion drill, and the positive circulation slag discharging system includes:
the positive circulation deslagging system comprises a first discharge pipe, a first slurry pump and a slurry sedimentation purification tank;
the mud sedimentation and purification tank is arranged on one side of the protective cylinder;
disposing the first mud pump above the mud sedimentation and purification tank;
and connecting the feed end of the first slurry pump with the hole through the first discharge pipe.
Further, a positive circulation slag discharging system is arranged on one side of the protective sleeve and connected with the impact drill bit, and the positive circulation slag discharging system comprises:
the mud sedimentation and purification tank comprises a sedimentation tank and a mud tank, and the sedimentation tank is communicated with the mud tank;
the first slurry pump is erected on the slurry pool and pumps the slurry in the slurry pool back into the hole;
and the mud containing the sludge flowing out of the protective cylinder flows into the sedimentation tank, the sludge is precipitated in the sedimentation tank, and the mud from which the sludge is separated flows into the mud tank.
Further, discharging slag in a positive circulation manner in the hole drilled by the percussion drill bit, and enabling mud to flow upwards and back to enter the positive circulation slag discharging system, wherein the positive circulation slag discharging system comprises:
a filter screen is arranged between the sedimentation tank and the mud tank;
and the mud in the sedimentation tank flows into the mud tank after the filter screen filters mud residues.
Further, discharging slag in a positive circulation manner in the hole drilled by the percussion drill bit, and enabling mud to flow upwards and back to enter the positive circulation slag discharging system, wherein the positive circulation slag discharging system comprises: and a second slurry pump is arranged above the protective cylinder, and is used for pumping the muddy water in the hole out and discharging the muddy water into the sedimentation tank through a second discharge pipe.
In an optional embodiment of the present invention, a steel reinforcement cage is suspended in a hole, and the hole cleaning and slurry changing treatment is performed on the hole, including:
the manufactured reinforcement cage is lifted and installed through a crane, lifting points are arranged at the top and the middle of the reinforcement cage, and after the reinforcement cage is placed in a hole at a designated position, the reinforcement cage is fixed through welding lifting ribs.
In an optional embodiment of the present invention, a steel reinforcement cage is suspended in a hole, and the hole cleaning and slurry changing treatment is performed on the hole, including: placing a pouring guide pipe at a drill hole, installing an elbow at the top of the pouring guide pipe, feeding slurry into the hole through the pouring guide pipe by using the first slurry pump, and returning fine particle sediments at the bottom of the hole out of the hole along with the slurry.
Further, concrete pouring is carried out in the hole where the reinforcement cage is placed to form a pile, and the pile casing is taken out, and the method comprises the following steps:
and pouring concrete into the hole through the pouring guide pipe, and removing the pouring guide pipe along the direction from the orifice to the bottom of the hole after the concrete is poured.
The invention can realize the following beneficial effects:
in a first aspect, the present invention provides a construction method for a percussion drilling positive circulation cast-in-place pile, comprising: embedding a pile casing to a specified depth, replacing and filling clay on the foundation at the bottom of the pile casing for tamping, and backfilling clay on the outer wall of the pile casing and tamping in layers; erecting a percussion drill on one side of the protective cylinder, wherein a percussion drill bit of the percussion drill extends into the protective cylinder to drill a hole and advance; arranging a positive circulation slag discharging system on one side of the protective cylinder, and synchronously implementing the positive circulation slag discharging system and the impact drill bit, wherein the positive circulation slag discharging pipe head is 1.0m higher than the impact drill bit; deslagging in a hole drilled by the percussion drill in a positive circulation mode, and enabling mud to flow upwards and back to enter the positive circulation deslagging system; hoisting a reinforcement cage in the hole, and performing hole cleaning and slurry changing treatment on the hole; and pouring concrete into the hole in which the reinforcement cage is placed to form a pile, and taking out the pile casing.
In the invention, firstly, a pile casing is buried, clay is filled in the foundation at the bottom of the pile casing and tamped, and clay is filled in the outer wall of the pile casing and tamped layer by layer; then, erecting an impact drilling machine for drilling on the ground, wherein the impact drilling machine is connected with a control system, and a user controls the start and the stop of the impact drilling machine through the control system; and a positive circulation slag discharging system is arranged on one side of the protective cylinder and is connected with the impact drill bit so as to realize slag discharging treatment in the hole forming process, and in the subsequent process, the hole cleaning and slurry changing treatment is carried out so that the environment in the hole is suitable for placing a reinforcement cage and pouring concrete.
Compared with the prior art, the construction method of the impact drilling positive circulation cast-in-place pile provided by the invention has the advantages that the positive circulation deslagging system is arranged at the side of the drilling hole, so that dregs in the hole are discharged in the hole forming process, and in the subsequent process, the hole cleaning and slurry changing treatment is carried out, so that the environment in the hole is suitable for placing a reinforcement cage and pouring concrete.
In conclusion, the invention at least relieves the technical problem that slag cannot be directly discharged in the drilling process because the slag needs to be fished through the slag-dragging barrel after the hole is formed in the hole forming process in the prior art.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of a positive circulation hole formed by impact drilling on land according to the construction method for a positive circulation cast-in-place pile by impact drilling provided by the embodiment of the invention;
fig. 2 is a schematic top view of a structure of a positive circulation hole of a percussion drill on land according to the construction method of a positive circulation cast-in-place pile of the present invention;
fig. 3 is a schematic structural diagram of a forward circulation hole drilling by impact drilling at a steel trestle construction platform in the construction method of the forward circulation cast-in-place pile by impact drilling provided by the embodiment of the invention.
Icon: 1-a percussion drill; 2-a control system; 3-a percussion drill bit; 4-protecting the cylinder; 5-a first bank of tubes; 6-a first mud pump; 7-a sedimentation tank; 8-a mud pit; 9-filtering the screen; 10-a second mud pump; 11-second row of tubes.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the 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.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "upper", "lower", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings or orientations or positional relationships conventionally laid out when products of the present invention are used, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," and "connected" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; 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.
Some embodiments of the invention are described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.
Example one
In the present embodiment, with reference to fig. 1 or 3, a method for constructing a percussion drilling positive-circulation cast-in-place pile includes: embedding the pile casing 4 to a specified depth, replacing and filling clay on the foundation at the bottom of the pile casing 4 for tamping, and filling clay on the outer wall of the pile casing 4 for tamping in a layering manner; erecting an impact drilling machine 1 on one side of a protective cylinder 4, and extending an impact drill bit 3 of the impact drilling machine 1 into the protective cylinder 4 to drill a hole and advance; a positive circulation slag discharging system is arranged on one side of the protective cylinder 4, and is synchronously implemented with the impact drill bit 3, and the head of the positive circulation slag discharging pipe is 1.0m higher than the impact drill bit; deslagging in a hole drilled by the percussion drill bit 3 in a positive circulation mode, and enabling slurry to flow upwards and back to enter a positive circulation deslagging system; hoisting a reinforcement cage in the hole, and performing hole cleaning and grout changing treatment on the hole; and (5) pouring concrete into the hole in which the reinforcement cage is placed to form a pile, and taking out the pile casing 4.
The embodiment of the invention at least relieves the technical problem that slag can not be directly discharged in the drilling process because the slag needs to be fished through the slag fishing barrel after the hole is formed in the hole forming process in the prior art.
In the embodiment of the invention, firstly, the pile casing 4 is buried, the foundation at the bottom of the pile casing 4 is filled with clay and tamped, and the outer wall of the pile casing 4 is filled with clay and tamped layer by layer; then, erecting an impact drilling machine 1 for drilling on the ground, wherein the impact drilling machine 1 is connected with a control system 2, and a user controls the impact drilling machine 1 to be started and closed through the control system 2; and a positive circulation slag discharging system is arranged on one side of the protective cylinder 4 and is connected with the impact drill 3 so as to realize slag discharging treatment in the hole forming process, and in the subsequent process, the hole cleaning and slurry changing treatment is carried out so that the environment in the hole is suitable for placing a reinforcement cage and pouring concrete.
Compared with the prior art, the construction method of the impact drilling positive circulation cast-in-place pile provided by the embodiment of the invention is used for discharging dregs in the hole forming process by arranging the positive circulation deslagging system at the side of the drilling hole, and in the subsequent process, the hole cleaning and slurry changing treatment is carried out so that the environment in the hole is suitable for placing a reinforcement cage and pouring concrete.
In an alternative embodiment of this embodiment, referring to fig. 1 or fig. 3, burying the casing 4, tamping the bottom foundation of the casing 4 with clay, and backfilling the outer wall of the casing 4 with clay and tamping them layer by layer, including: the top of the protective cylinder 4 is arranged at a position 0.3 to 0.5m higher than the ground.
Specifically, the method comprises the following steps: the inner diameter of the pile casing 4 is 20cm larger than the designed pile diameter, the foundation at the bottom of the pile casing 4 is filled with clay and tamped, and the periphery of the pile casing 4 is filled with clay and tamped layer by layer to prevent water seepage.
Preferably, in the burying process, the position deviation of the pile casing 4 is less than 5cm, the inclination is not more than 1%, and the top of the pile casing is 0.3-0.5 m higher than the ground. And the construction is carried out in a river, the protective cylinder 4 is 10m higher than the normal water level, and the protective cylinder 4 in the water is made of steel materials with the wall thickness of 1.6 mm.
Preferably, the slurrying clay should meet the following quality requirements: the clay content is more than 35%; the sand content is not more than 10%; the pulping rate is not lower than 3-5 m3/t; a plasticity index of greater than 20; the ratio of the silica to alumina content is 3:4. And the performance indexes of the on-site slurry are as follows: the density is 1.2-1.3 g/cm3; the viscosity of the 1006 type funnel is 22-30 s; the sand content is not more than 4%; the colloid rate is not less than 97%, and the PH value is: greater than 6.5%.
In an alternative embodiment of this embodiment, the percussion drill 1 is erected on one side of the casing 4, and the percussion drill bit 3 of the percussion drill 1 extends into the casing 4 to drill a hole, including: the percussion drill bit 3 performs an up-and-down percussive movement in the hole.
Specifically, the method comprises the following steps: the impact drill bit 3 is used for processing a hole into a specification meeting the size, except for performing vertical impact motion at the bottom of the hole; and under the effect of the torque force of the big rope, the percussion bit 3 also slowly rotates back and forth, the slurry conveying pipe can be wound with the big rope after a long drilling time, once the situation occurs, the positive circulation deslagging system and the percussion drill 1 need to be suspended firstly, and the positive circulation deslagging system and the percussion drill 1 are released manually.
In an optional embodiment of this embodiment, a positive circulation slag discharging system is disposed on one side of the casing 4, and the positive circulation slag discharging system is connected to the percussion drill bit 3, and includes: the positive circulation deslagging system comprises a first pipe 5, a first slurry pump 6 and a slurry sedimentation purification tank; one side of the protective cylinder 4 is provided with the mud sedimentation and purification tank; arranging a first slurry pump 6 above the slurry sedimentation and purification tank; the feed end of the first slurry pump 6 is connected to the bore via the first row of tubes 5.
Specifically, the method comprises the following steps: the positive circulation deslagging system consists of a first slurry pump 6, a slurry sedimentation and purification tank, a first discharge pipe 5, a hose, an elbow, a slurry injection pipe and other devices, and is provided with facilities for discharging water, removing slag, discharging slurry and the like. The drilling slag precipitated in the first mud discharging pipe 5 and the mud sedimentation purifying tank needs to be removed in time, and the removed drilling slag needs to be transported away from the site, so that the drilling slag and waste are prevented from polluting the construction site and the surrounding environment.
Welding a slurry shooting pipe at the position 0.8-1.0 m away from the bottom of the percussion bit 3 at the position of the percussion bit 3, connecting a rubber pipe to the upper opening of the slurry shooting pipe, and connecting the slurry shooting pipe with a large rope rubber pipe after winding a circle on the upper part of the drilling bit; the rubber tube is connected with each 3-5 m of the big rope by a buckling method, the rubber tube above the orifice is connected with the upper elbow, and the other end of the elbow is connected with the first slurry pump 6 through the rubber tube.
Further, referring to fig. 1 or 2, a positive circulation slag discharging system is provided at one side of the casing 4 and connected to the percussion drill 3, and includes: the mud sedimentation and purification tank comprises a sedimentation tank 7 and a mud tank 8, and the sedimentation tank 7 is communicated with the mud tank 8; a first slurry pump 6 is erected on the slurry pool 8, and the first slurry pump 6 pumps the slurry in the slurry pool 8 back into the hole; the mud containing the sludge flowing out of the casing 4 flows into a sedimentation tank 7, the sludge is precipitated in the sedimentation tank 7, and the mud separated from the sludge flows into a mud tank 8.
Specifically, the method comprises the following steps: when the mud circulates, the first mud pump 6 pumps the mud out of the mud pool 8, inputs the mud into the first discharge pipe 5 and conveys the mud to the upward movement, and the mud passes through the cylinder protecting overflow port and flows back to the sedimentation tank 7 again; and the mud in the sedimentation tank 7 flows into the mud tank 8 again after mud residue sedimentation.
Further, with reference to fig. 1 or 3, the discharge of the slag in the hole drilled by the percussion drill bit 3 is performed by means of a positive circulation and the upward flow of the mud into a positive circulation slag discharge system, comprising: a filter screen 9 is arranged between the sedimentation tank 7 and the mud tank 8; the mud in the sedimentation tank 7 flows into a mud tank 8 after being filtered by a filter screen 9.
Specifically, the method comprises the following steps: a filter screen 9 is arranged between the sedimentation tank 7 and the mud tank 8, mud in the sedimentation tank 7 flows into the mud tank 8 after being filtered by the filter screen 9, and preferably, the sedimentation tank 7 and the mud tank 8 are integrally formed and are separated by the filter screen 9.
Further, with reference to fig. 3, the discharge of the slag in the hole drilled by the percussion drill bit 3 is performed by means of a positive circulation and the upward flow of the mud is returned to the positive circulation slag discharge system, comprising: and a second slurry pump 10 is arranged above the protective cylinder 4, and the second slurry pump 10 pumps the muddy water in the hole out and discharges the muddy water into the sedimentation tank 7 through a second discharge pipe 11.
Specifically, the method comprises the following steps: when the bottoms of the sedimentation tank 7 and the slurry tank 8 are located above the ground, the slurry needs to be pumped into the sedimentation tank 7 by a second slurry pump 10 and a second discharge pipe 11 because of a height difference between the bottom and the casing 4.
In an optional implementation manner of this embodiment, a steel reinforcement cage is hoisted in a hole, and a hole cleaning and slurry changing process is performed on the hole, including: the manufactured reinforcement cage is lifted and installed through a crane, hoisting points are arranged at the top and the middle of the reinforcement cage, and the reinforcement cage is fixed through welding hoisting ribs after the reinforcement cage is placed at the designated position in the hole.
Specifically, the method comprises the following steps: the steel reinforcement cage adopts automatic seam welder preparation, and the main muscle reinforcing bar adopts mechanical muffjoint, and the stiffening ring adopts the processing mould to process. The framework of the reinforcement cage is provided with a reinforcing steel bar every 2m from 10cm below the bottom of a bearing platform (a ground tie beam), and the diameter of a pile is more than 1.8m, and a triangular inner supporting steel bar is arranged to prevent the deformation of the reinforcement cage.
When the crane lifts the steel reinforcement cage, the lifting hook is connected with the steel carrying pole through the pulley and the steel wire rope, and the steel reinforcement cage is hooked. The first hoisting point is arranged at the upper part of the framework and hoisted by using the main hook. The second hanging point is arranged between the middle point and the trisection point of the framework. When in lifting, the first lifting point is lifted firstly, the framework is lifted slightly, and then the framework and the second lifting point are lifted simultaneously. And after the framework leaves the ground, stopping lifting and loosening the steel wire rope by the second lifting point until the framework is vertical to the ground, stopping lifting by the first lifting point and releasing the steel wire rope of the second lifting point. And slowly moving the reinforcement cage, hoisting the reinforcement cage above the hole site, aligning the hole site, stabilizing, slowly lowering, and making the center of the reinforcement cage consistent with the center of the drilled hole by means of the dead weight of the pulley of the first hoisting point and the reinforcement cage. And measuring the reinforcement cage by taking the top surface of the protective cylinder as a reference surface, and welding and hanging ribs for fixing when the reinforcement cage reaches a designed position.
In an optional implementation manner of this embodiment, a steel reinforcement cage is hoisted in a hole, and a hole cleaning and slurry changing process is performed on the hole, including: placing a pouring guide pipe at the position of a drill hole, installing an elbow at the top of the pouring guide pipe, feeding slurry into the hole through the pouring guide pipe by using a first slurry pump 6, and returning fine particle sediments at the bottom of the hole out of the hole along with the slurry.
Specifically, the method comprises the following steps: an elbow is arranged at the top of the guide pipe, fresh slurry with low density and viscosity is sent into the hole through the pouring guide pipe by a first slurry pump 6, and fine particle sediments at the bottom of the hole return out of the hole along with the slurry.
Further, concrete pouring is carried out in the hole where the reinforcement cage is placed to form a pile, and the pile casing 4 is taken out, and the method comprises the following steps: and pouring concrete into the hole through the pouring guide pipe, and removing the pouring guide pipe along the direction from the orifice to the bottom of the hole after the concrete is poured.
Specifically, the method comprises the following steps: the pouring guide pipe is a steel pipe with the diameter of 20-35 cm and is connected with a turnbuckle; the bottom section is provided with 4m, the middle section is 3m each, and 1-2 short pipes with 0.5-1 m are provided. The pile foundation concrete adopts C30 underwater concrete. And the concrete should be poured continuously, and the buried depth of the conduit is ensured to be 2.0-6.0 m, if the buried depth of the conduit exceeds 6m, the conduit should be removed from the orifice in reverse order.
Finally, it should be noted that: the embodiments in the present description are all described in a progressive manner, each embodiment focuses on the differences from the other embodiments, and the same and similar parts among the embodiments can be referred to each other; the above embodiments in the present specification are only used for illustrating the technical solutions of the present invention, and not for limiting the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A construction method of a percussion drilling positive circulation cast-in-place pile is characterized by comprising the following steps:
burying a pile casing (4) to a specified depth, replacing and filling clay on the foundation at the bottom of the pile casing (4) for tamping, and filling clay on the outer wall of the pile casing (4) for tamping in a layering manner;
erecting a percussion drill (1) on one side of the protective cylinder (4), wherein a percussion drill bit (3) of the percussion drill (1) extends into the protective cylinder (4) to drill a hole and advance;
a positive circulation slag discharging system is arranged on one side of the protective cylinder (4), and is synchronously implemented with the impact drill bit (3), and the positive circulation slag discharging pipe head is 1.0m higher than the impact drill bit;
deslagging in a hole drilled by the impact drill bit (3) in a positive circulation mode, and enabling mud to flow upwards and back to enter the positive circulation deslagging system;
hoisting a reinforcement cage in the hole, and performing hole cleaning and slurry changing treatment on the hole;
and pouring concrete into the hole in which the reinforcement cage is placed to form a pile, and taking out the pile casing (4).
2. The method for constructing a positive-circulation bored concrete pile by percussion drilling according to claim 1, wherein burying a casing (4), tamping clay for foundation replacement and filling at the bottom of the casing (4), and tamping clay for filling and layering on the outer wall of the casing (4) comprises:
the top of the protective cylinder (4) is arranged at a position 0.3-0.5 m higher than the ground.
3. The construction method of the positive-circulation cast-in-place pile by impact drilling according to claim 1, wherein a percussion drill (1) is erected on one side of the casing (4), and a percussion bit (3) of the percussion drill (1) extends into the casing (4) to drill the hole, and the construction method comprises the following steps:
the impact drill bit (3) performs up-and-down impact motion in the hole.
4. The construction method of the impact drilling positive circulation cast-in-place pile according to claim 1, wherein a positive circulation deslagging system is arranged on one side of the casing (4) and is connected with the impact drill bit (3), and the construction method comprises the following steps:
the positive circulation deslagging system comprises a first discharge pipe (5), a first slurry pump (6) and a slurry sedimentation purification tank;
one side of the protective cylinder (4) is provided with the mud sedimentation and purification tank;
-arranging the first slurry pump (6) above the mud sedimentation basin;
and connecting the feeding end of the first slurry pump (6) with the hole through the first discharge pipe (5).
5. The construction method of the impact drilling positive circulation cast-in-place pile according to claim 4, wherein a positive circulation deslagging system is arranged on one side of the casing (4) and is connected with the impact drill bit (3), and the construction method comprises the following steps:
the mud sedimentation and purification tank comprises a sedimentation tank (7) and a mud tank (8), and the sedimentation tank (7) is communicated with the mud tank (8);
the first slurry pump (6) is erected on the slurry pool (8), and the first slurry pump (6) pumps the slurry in the slurry pool (8) back into the hole;
the mud containing the sludge flowing out of the casing (4) flows into the sedimentation tank (7), the sludge is precipitated in the sedimentation tank (7), and the mud separated from the sludge flows into the mud tank (8).
6. The construction method of the positive-circulation cast-in-place pile by impact drilling according to claim 5, characterized in that the positive-circulation deslagging is carried out in the hole drilled by the impact drill bit (3), and the mud is made to flow upwards and back to the positive-circulation deslagging system, and the method comprises the following steps:
a filter screen (9) is arranged between the sedimentation tank (7) and the mud tank (8);
the mud in the sedimentation tank (7) flows into the mud tank (8) after being filtered by the filter screen (9).
7. The construction method of the positive-circulation cast-in-place pile by impact drilling according to claim 6, characterized in that the positive-circulation deslagging is carried out in the hole drilled by the impact drill bit (3), and the mud is made to flow upwards and back to the positive-circulation deslagging system, and the method comprises the following steps:
and a second slurry pump (10) is arranged above the protective cylinder (4), the second slurry pump (10) pumps out the muddy water in the hole, and the muddy water is discharged into the sedimentation tank (7) through a second discharge pipe (11).
8. The construction method of the impact drilling positive circulation cast-in-place pile according to claim 1, wherein a reinforcement cage is hoisted in the hole, and the hole is cleaned and grouted, comprising:
the manufactured reinforcement cage is lifted and installed through a crane, lifting points are arranged at the top and the middle of the reinforcement cage, and after the reinforcement cage is placed in a hole at a designated position, the reinforcement cage is fixed through welding lifting ribs.
9. The construction method of the impact drilling positive circulation cast-in-place pile according to claim 4, wherein the steel reinforcement cage is hoisted in the hole, and the hole cleaning and grout changing treatment is performed on the hole, and comprises the following steps:
placing a pouring guide pipe at the position of a drill hole, installing an elbow at the top of the pouring guide pipe, feeding slurry into the hole through the pouring guide pipe by using a first slurry pump (6), and returning fine particle sediments at the bottom of the hole to the outside of the hole along with the slurry.
10. The construction method of a positive-circulation cast-in-place pile by percussion drilling according to claim 9, wherein the concrete is cast into the hole in which the reinforcement cage is placed to form a pile, and the casing (4) is taken out, comprising:
and pouring concrete into the hole through the pouring guide pipe, and removing the pouring guide pipe along the direction from the orifice to the bottom of the hole after the concrete is poured.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116220070A (en) * | 2023-03-14 | 2023-06-06 | 中国十九冶集团有限公司 | Construction method of rectangular anti-slide pile |
| CN117145389A (en) * | 2023-10-31 | 2023-12-01 | 山东港口烟台港集团有限公司 | Foundation impact type drilling device for ocean engineering construction |
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2022
- 2022-11-23 CN CN202211470576.5A patent/CN115726360A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116220070A (en) * | 2023-03-14 | 2023-06-06 | 中国十九冶集团有限公司 | Construction method of rectangular anti-slide pile |
| CN117145389A (en) * | 2023-10-31 | 2023-12-01 | 山东港口烟台港集团有限公司 | Foundation impact type drilling device for ocean engineering construction |
| CN117145389B (en) * | 2023-10-31 | 2024-04-12 | 山东港口烟台港集团有限公司 | Foundation impact type drilling device for ocean engineering construction |
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