CN111560950A - Pile hole forming method for cast-in-place pile - Google Patents
Pile hole forming method for cast-in-place pile Download PDFInfo
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- CN111560950A CN111560950A CN202010314086.0A CN202010314086A CN111560950A CN 111560950 A CN111560950 A CN 111560950A CN 202010314086 A CN202010314086 A CN 202010314086A CN 111560950 A CN111560950 A CN 111560950A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/66—Mould-pipes or other moulds
- E02D5/68—Mould-pipes or other moulds for making bulkheads or elements thereof
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- General Engineering & Computer Science (AREA)
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Abstract
The invention provides a method for forming a hole of a cast-in-place pile, which comprises the following steps: firstly, preparing slurry for drilling a pile hole, and injecting the slurry into a slurry pool for later use. Then, a steel casing is embedded, a drill rod of the drilling machine is inserted into the steel casing, and a grouting device is arranged on the inner wall of the top of the steel casing. And then, introducing the slurry from the slurry tank to the steel casing, injecting the slurry into the steel casing from a gap between the steel casing and the drill rod through a grouting device, and starting the drilling machine to drill. In the hole rotating construction, slurry mixed with cut soil bodies is pumped into a slurry pool from a drill rod, in the rotating process of the drill rod, the mixed slurry in the slurry pool is guided to a steel casing, the mixed slurry is injected into the steel casing from a gap between the steel casing and the drill rod through a grouting device, and the step is executed in a circulating mode until the pile hole reaches the designed depth. And then, carrying out hole cleaning operation on the rotary hole to finish pile hole construction. The pile hole forming method of the cast-in-place pile can avoid the risk of hole collapse and improve the pile forming quality.
Description
Technical Field
The invention relates to the field of municipal engineering construction, in particular to a method for forming a hole in a pile hole of a cast-in-place pile.
Background
The pile foundation is a common foundation form in the field of construction, and the cast-in-place pile is formed by pouring concrete into a pre-drilled hole and forming a pile body after the concrete is solidified to form a foundation pile.
Drilling is a key process for forming a cast-in-place pile and a pile foundation, and belongs to the prior art. The drilling process generally uses a rotary drilling machine, when the drill bit cuts soil, mud flows out from the top of the drill bit, and forms mixed mud with the cut soil, the mixed mud is pumped into a mud tank from a drill rod through a mud pump, after sedimentation, the mud flows out from the top of the drill bit, and the mud is repeatedly circulated until the hole is formed. When the drill bit is used for cutting soil, slurry flows out of the drill bit, and can impact soil in the circumferential direction of the pile hole, so that a slurry protection wall is damaged, the pile hole is enlarged, a hole stepping risk is caused, the pile forming quality is poor, rework is needed in the later period, and the construction period is delayed.
Disclosure of Invention
Aiming at the technical problems of high risk of hole stepping, poor pile forming quality and prolonged construction period in the prior art, the invention provides a hole forming method for a cast-in-place pile hole, which can avoid the risk of hole collapse and improve the pile forming quality.
In order to achieve the aim, the method for forming the hole of the pile hole of the cast-in-place pile comprises the following steps: digging a mud pit in the foundation pit, and injecting prepared mud for drilling a pile hole into the mud pit; embedding a steel casing at the construction position of the cast-in-place pile, and inserting a drill rod of a drilling machine into the steel casing; a grouting device is arranged on the inner wall of the top of the steel casing; draining the mud from the mud pit to the steel casing, and injecting the mud into the steel casing from a gap between the steel casing and the drill rod through the grouting device; rotating the drill rod to drive a drill bit at the top end of the drill rod to cut soil to perform pile hole rotating operation; starting a mud pump communicated with the drill rod, and pumping mud mixed with cut soil bodies in hole turning operation into a mud pool from the drill rod; in the rotation process of the drill rod, guiding mixed mud in the mud pit to the steel casing, injecting the mixed mud into the steel casing from a gap between the steel casing and the drill rod through the grouting device, and circularly executing the step until the pile hole reaches the designed depth; and carrying out hole cleaning operation on the pile hole to finish the pile hole construction.
Further, the slip casting device is the slip casting pipe, the slip casting pipe is followed the inner wall that the steel protected a section of thick bamboo is the annular setting and is in the top that the steel protected a section of thick bamboo, a plurality of grout outlet have evenly been seted up on the slip casting pipe.
Further, the draining the mud from the mud pit to the steel casing includes: digging a mud ditch between the steel casing and the mud pit; a slurry inlet hole communicated with the slurry groove is formed in the top of the wall of the steel casing; and the mud is drained from the mud pool to the steel casing sequentially through the mud ditch, the mud inlet hole and the grouting device.
Further, the drill rod is rotated to drive the drill bit at the top end of the drill rod to cut soil to perform pile hole rotating operation, and the method comprises the following steps: a flow rate regulating valve is arranged in the slurry inlet hole; and rotating the drill rod to drive the drill bit to cut soil body to perform pile hole rotating operation, and adjusting the injection rate of the slurry through the flow rate adjusting valve according to the rotating speed of the drill rod during hole rotating operation.
Further, the circularly draining the mixed mud in the mud pit to the steel casing during the rotation of the drill rod comprises: depositing the mud mixed with the cut soil body in the mud pit; and circularly draining the precipitated slurry serving as the mixed slurry to the steel casing.
Further, the hole cleaning operation of the pile hole comprises: starting a mud pump communicated with the drill bit, pumping the precipitated mud from the mud tank to the drill bit, enabling the mud to flow out of the top of the drill bit, and removing the sediment at the bottom of the pile hole; starting a mud pump communicated with the drill pipe, and pumping the sediment mud mixed with the sediment from the drill pipe into the mud pit; and guiding the sediment slurry from the slurry tank to the drill bit, enabling the sediment slurry to flow out from the top of the drill bit, clearing the sediment at the bottom of the pile hole, and circularly executing the step until the sediment thickness at the bottom of the pile hole is smaller than the preset thickness.
Further, the slurry is prepared from bentonite, water and inert plugging materials.
Through the technical scheme provided by the invention, the invention at least has the following technical effects:
the invention relates to a method for forming a pile hole of a cast-in-place pile. And then embedding a steel pile casing at the construction position of the cast-in-place pile, inserting a drill rod of a drilling machine into the steel pile casing, and arranging a grouting device on the inner wall of the top of the steel pile casing. And then, the mud is drained from the mud pit to the steel casing, the mud is injected into the steel casing from a gap between the steel casing and the drill rod through a grouting device, and the drilling machine is started to drill. In hole rotating construction, slurry mixed with cut soil bodies is extracted from a drill rod to a slurry pool, in the rotating process of the drill rod, the mixed slurry in the slurry pool is guided to a steel casing, the mixed slurry is injected into the steel casing from a gap between the steel casing and the drill rod through a grouting device, and the step is executed in a circulating mode until the pile hole reaches the designed depth. And then, carrying out hole cleaning operation on the rotary hole to finish pile hole construction. The pile hole forming method of the cast-in-place pile can avoid the risk of hole collapse and improve the pile forming quality.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
Fig. 1 is a flowchart of a method for forming a hole in a bored concrete pile hole according to an embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating embodiments of the invention, are given by way of illustration and explanation only, not limitation.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the present invention, unless specified to the contrary, use of the terms of orientation such as "upper, lower, top, bottom" or the like are generally described with respect to the orientation shown in the drawings or the positional relationship of the components with respect to each other in the vertical, or gravitational direction.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Referring to fig. 1, an embodiment of the present invention provides a method for forming a hole in a bored concrete pile, including the following steps: s101: digging a mud pit in the foundation pit, and injecting prepared mud for drilling a pile hole into the mud pit; s102: embedding a steel casing at the construction position of the cast-in-place pile, and inserting a drill rod of a drilling machine into the steel casing; s103: a grouting device is arranged on the inner wall of the top of the steel casing; s104: draining the mud from the mud pit to the steel casing, and injecting the mud into the steel casing from a gap between the steel casing and the drill rod through the grouting device; s105: rotating the drill rod to drive a drill bit at the top end of the drill rod to cut soil to perform pile hole rotating operation; s106: starting a mud pump communicated with the drill rod, and pumping mud mixed with cut soil bodies in hole turning operation into a mud pool from the drill rod; s107: in the rotation process of the drill rod, guiding mixed mud in the mud pit to the steel casing, injecting the mixed mud into the steel casing from a gap between the steel casing and the drill rod through the grouting device, and circularly executing the step until the pile hole reaches the designed depth; s108: and carrying out hole cleaning operation on the pile hole to finish the pile hole construction.
Specifically, in the embodiment of the invention, various impurities in a construction site are removed before construction, the site is leveled, rolled and compacted, sleepers are paved and corrected by using a leveling instrument, the stability of a drilling machine in working is ensured, and then a total station is used for calibrating the construction position of the cast-in-place pile by adopting a polar coordinate method. Then a mud pit is dug in the foundation pit, the mud is mixed by a mixer while the mud pit is dug, and then the mud is injected into the mud pit by a mud pump.
And rolling the steel casing by using a winch, releasing the central line of the designed pile by a measuring team before embedding, excavating a foundation pit of the steel casing, wherein the excavation diameter is slightly smaller than the outer diameter of the steel casing, and extruding and embedding the steel casing. After the steel protection cylinder is buried, clay is adopted for tamping and packing the periphery of the steel protection cylinder, and anti-falling measures are added. Preferably, the diameter of the steel pile casing is 10-15cm larger than the diameter of the pile, the thickness of the steel plate is 5mm, and a back rib can be additionally arranged outside the steel pile casing according to actual requirements in site construction to avoid serious deformation; the embedding depth of the steel pile casing is 3m, when the steel pile casing is embedded, the center deviation is not more than 50mm by taking the pile position as a reference, and the embedded steel pile casing is 20-30 cm higher than the ground.
And then erecting a drilling machine, inserting a drill rod of the drilling machine into the steel casing, and arranging a grouting device on the inner wall of the top of the steel casing. And pumping the slurry out of the slurry pool through a slurry pump, draining the slurry to the steel casing, and injecting the slurry into the steel casing from a gap between the steel casing and the drill rod through a grouting device. The mud flows down the wall of the steel casing to the drill bit position. And opening the drilling machine to rotate the drill rod, and driving the drill bit at the top end of the drill rod to cut soil to perform pile hole rotating operation. And starting a slurry pump communicated with the drill rod, pumping the slurry mixed with the cut soil body in the hole rotating operation into a slurry tank from the drill rod, continuously draining the mixed slurry in the slurry tank to the steel casing in the rotating process of the drill rod, injecting the mixed slurry into the steel casing from a gap between the steel casing and the drill rod through a grouting device, circularly executing the step until the pile hole reaches the designed depth, and then performing hole cleaning operation on the pile hole to finish the pile hole construction.
According to the method for forming the pile hole of the cast-in-place pile, provided by the invention, the slurry is injected from the gap between the steel casing and the drill rod and flows downwards to the position of the drill bit along the inner wall of the steel casing, so that the impact of the slurry on the soil body at the bottom of the pile hole is reduced, the wall protection effect of the slurry is ensured, the pile hole is prevented from being collapsed due to expansion, and the pile forming quality is improved.
Further, the slip casting device is the slip casting pipe, the slip casting pipe is followed the inner wall that the steel protected a section of thick bamboo is the annular setting and is in the top that the steel protected a section of thick bamboo, a plurality of grout outlet have evenly been seted up on the slip casting pipe.
Specifically, in the embodiment of the invention, the grouting device is a grouting pipe, the grouting pipe is annularly arranged at the top of the steel casing along the inner wall of the steel casing, a plurality of slurry outlet holes are uniformly formed in the grouting pipe, slurry flows in through the slurry inlet holes of the grouting pipe, flows out of the plurality of slurry outlet holes and flows downwards along the inner wall of the steel casing, the slurry outlet pressure of a single slurry outlet hole is reduced through the plurality of slurry outlet holes, the pressure of the slurry flowing to the drill bit position is weakened, the hole collapse risk is reduced, a uniform slurry protection wall is formed in the pile hole, and the pile forming effect of the cast-in-place pile is improved.
Further, the draining the mud from the mud pit to the steel casing includes: digging a mud ditch between the steel casing and the mud pit; a slurry inlet hole communicated with the slurry groove is formed in the top of the wall of the steel casing; and the mud is drained from the mud pool to the steel casing sequentially through the mud ditch, the mud inlet hole and the grouting device.
Specifically, in the embodiment of the invention, after the grouting device is arranged on the inner wall of the top of the steel casing, a mud groove is dug between the mud pit and the steel casing, a mud inlet hole is formed in the top of the steel casing and is aligned with a mud inlet of the grouting pipe, a mud pump is arranged in the mud pit, mud is pumped out of the mud pit, flows into the grouting pipe through the mud groove, the mud inlet hole and the mud inlet of the grouting pipe in sequence, and flows out of a plurality of mud outlets of the grouting pipe.
Further, the drill rod is rotated to drive the drill bit at the top end of the drill rod to cut soil to perform pile hole rotating operation, and the method comprises the following steps: a flow rate regulating valve is arranged in the slurry inlet hole; and rotating the drill rod to drive the drill bit to cut soil body to perform pile hole rotating operation, and adjusting the injection rate of the slurry through the flow rate adjusting valve according to the rotating speed of the drill rod during hole rotating operation.
Specifically, in the embodiment of the invention, the flow rate regulating valve is arranged in the slurry inlet hole, the injection rate of the slurry can be regulated by the flow rate regulating valve according to the rotating speed of the drill rod during hole rotating construction, when hole rotating operation is started, the drill bit is slightly pressed and slowly rotated, the slurry is injected at a smaller injection rate, after the drill bit works normally, the rotating speed is gradually increased, and the injection rate of the slurry is increased. The injection rate is adjusted corresponding to the rotating speed of the drill rod, the effect of mud wall protection is guaranteed, the quantity of settled slag is reduced, and the drilling precision is improved.
Further, the circularly draining the mixed mud in the mud pit to the steel casing during the rotation of the drill rod comprises: depositing the mud mixed with the cut soil body in the mud pit; and circularly draining the precipitated slurry serving as the mixed slurry to the steel casing.
Specifically, in the embodiment of the invention, after the mud mixed with the cut soil body in the hole turning operation is extracted from the drill rod into the mud tank, the mud in the mud tank is precipitated, and the upper layer mud after precipitation is circularly drained to the steel casing as the mixed mud. The amount of the sediment in the injected circulating slurry is reduced by the sedimentation of the slurry, so that the injected slurry can be fully mixed with the soil body cut in the hole turning operation, the cut soil body is discharged out of a pile hole through a drill rod, the amount of the sediment in the hole turning is reduced, and the drilling precision is improved.
Further, the hole cleaning operation of the pile hole comprises: starting a mud pump communicated with the drill bit, pumping the precipitated mud from the mud tank to the drill bit, enabling the mud to flow out of the top of the drill bit, and removing the sediment at the bottom of the pile hole; starting a mud pump communicated with the drill pipe, and pumping the sediment mud mixed with the sediment from the drill pipe into the mud pit; and guiding the sediment slurry from the slurry tank to the drill bit, enabling the sediment slurry to flow out from the top of the drill bit, clearing the sediment at the bottom of the pile hole, and circularly executing the step until the sediment thickness at the bottom of the pile hole is smaller than the preset thickness.
Specifically, in the embodiment of the invention, after a pile hole is drilled to the designed depth, the drill rod is lifted, the hole depth is measured by adopting a measuring rope, the measuring rope precision needs to be checked in advance, an iron block of about 2kg is installed at the end of the measuring rope, the iron block slowly hangs into the hole bottom along with the self weight of the iron block, the iron block vertically swings up and down after reaching the bottom, when the hole bottom is confirmed, the reading can be carried out on the measuring rope, the hole checking is carried out, and the hole cleaning work is carried out after the hole bottom is met. And communicating the mud pump with the drill bit, pumping out the mud after precipitation in the mud tank, injecting the mud from the top of the drill bit, mixing the mud with the sediments in the pile hole, discharging the mud to the mud tank through the drill rod, precipitating the mud in the mud tank, circulating the precipitated mud to the drill bit for injection, and removing the sediments at the bottom of the pile hole. And (3) continuously detecting the slurry index until the specific gravity of the slurry at the bottom of the hole reaches 1.15-1.20, and stopping cleaning the hole until the thickness of the sediment at the bottom of the hole is not more than 150mm after cleaning the hole. And (3) before the underwater concrete is poured, re-measuring the thickness of the sediments at the bottom of the hole, and if the thickness of the sediments exceeds the standard requirement, performing hole cleaning operation on the bottom of the hole again before the concrete is poured.
The method for forming the pile hole of the cast-in-place pile is simple to operate, can quickly remove sediments at the bottom of the hole, and improves construction speed and hole cleaning effect.
Further, the slurry is prepared from bentonite, water and inert plugging materials.
In the embodiment of the invention, the pile foundation construction stratum is a silty clay stratum, hole collapse and leakage are easily caused in the drilling process, and the viscosity and the relative density of the slurry can be ensured and the wall protection effect can be ensured by preparing the slurry from bentonite, water and an inert plugging material.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (7)
1. A method for forming a hole in a pile hole of a cast-in-place pile is characterized by comprising the following steps:
digging a mud pit in the foundation pit, and injecting prepared mud for drilling a pile hole into the mud pit;
embedding a steel casing at the construction position of the cast-in-place pile, and inserting a drill rod of a drilling machine into the steel casing;
a grouting device is arranged on the inner wall of the top of the steel casing;
draining the mud from the mud pit to the steel casing, and injecting the mud into the steel casing from a gap between the steel casing and the drill rod through the grouting device;
rotating the drill rod to drive a drill bit at the top end of the drill rod to cut soil to perform pile hole rotating operation;
starting a mud pump communicated with the drill rod, and pumping mud mixed with cut soil bodies in hole turning operation into a mud pool from the drill rod;
in the rotation process of the drill rod, guiding mixed mud in the mud pit to the steel casing, injecting the mixed mud into the steel casing from a gap between the steel casing and the drill rod through the grouting device, and circularly executing the step until the pile hole reaches the designed depth;
and carrying out hole cleaning operation on the pile hole to finish the pile hole construction.
2. The method for forming the hole in the cast-in-place pile hole according to claim 1, wherein the grouting device is a grouting pipe, the grouting pipe is annularly arranged at the top of the steel casing along the inner wall of the steel casing, and a plurality of grout outlet holes are uniformly formed in the grouting pipe.
3. The method of claim 2, wherein said diverting the mud from the mud pit to the steel casing comprises:
digging a mud ditch between the steel casing and the mud pit;
a slurry inlet hole communicated with the slurry groove is formed in the top of the wall of the steel casing;
and the mud is drained from the mud pool to the steel casing sequentially through the mud ditch, the mud inlet hole and the grouting device.
4. The method for forming a hole in a bored pile according to claim 3, wherein the rotating the drill rod to drive the drill bit at the top end of the drill rod to cut soil for pile hole rotating operation comprises:
a flow rate regulating valve is arranged in the slurry inlet hole;
and rotating the drill rod to drive the drill bit to cut soil body to perform pile hole rotating operation, and adjusting the injection rate of the slurry through the flow rate adjusting valve according to the rotating speed of the drill rod during hole rotating operation.
5. The method for forming a hole in a bored pile according to claim 1, wherein the circulating and draining of the mixed slurry in the slurry tank to the steel casing during the rotation of the drill rod comprises:
depositing the mud mixed with the cut soil body in the mud pit;
and circularly draining the precipitated slurry serving as the mixed slurry to the steel casing.
6. The method of forming a bored pile hole according to claim 5, wherein said clearing of the pile hole comprises:
starting a mud pump communicated with the drill bit, pumping the precipitated mud from the mud tank to the drill bit, enabling the mud to flow out of the top of the drill bit, and removing the sediment at the bottom of the pile hole;
starting a mud pump communicated with the drill pipe, and pumping the sediment mud mixed with the sediment from the drill pipe into the mud pit;
and guiding the sediment slurry from the slurry tank to the drill bit, enabling the sediment slurry to flow out from the top of the drill bit, clearing the sediment at the bottom of the pile hole, and circularly executing the step until the sediment thickness at the bottom of the pile hole is smaller than the preset thickness.
7. The method for forming a hole in a bored pile according to any one of claims 1 to 6, wherein the slurry is prepared from bentonite, water and inert plugging materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010314086.0A CN111560950A (en) | 2020-04-20 | 2020-04-20 | Pile hole forming method for cast-in-place pile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010314086.0A CN111560950A (en) | 2020-04-20 | 2020-04-20 | Pile hole forming method for cast-in-place pile |
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| CN111560950A true CN111560950A (en) | 2020-08-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010314086.0A Pending CN111560950A (en) | 2020-04-20 | 2020-04-20 | Pile hole forming method for cast-in-place pile |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113738275A (en) * | 2021-09-02 | 2021-12-03 | 中铁二十三局集团第四工程有限公司 | Anti-pollution construction method for cast-in-situ bored pile in pile foundation engineering |
| CN114703831A (en) * | 2022-04-20 | 2022-07-05 | 山西四建集团有限公司 | Construction method of reinforced concrete cast-in-place pile under complex geological condition |
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| CN113738275B (en) * | 2021-09-02 | 2024-02-27 | 中铁二十三局集团第四工程有限公司 | Anti-pollution construction method for bored pile of pile foundation engineering |
| CN114703831A (en) * | 2022-04-20 | 2022-07-05 | 山西四建集团有限公司 | Construction method of reinforced concrete cast-in-place pile under complex geological condition |
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Application publication date: 20200821 |
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