CN111206576A - Cast-in-situ bored pile construction process - Google Patents
Cast-in-situ bored pile construction process Download PDFInfo
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- CN111206576A CN111206576A CN202010060377.1A CN202010060377A CN111206576A CN 111206576 A CN111206576 A CN 111206576A CN 202010060377 A CN202010060377 A CN 202010060377A CN 111206576 A CN111206576 A CN 111206576A
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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
- E02D2300/00—Materials
- E02D2300/0004—Synthetics
- E02D2300/0018—Cement used as binder
- E02D2300/0023—Slurry
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- General Life Sciences & Earth Sciences (AREA)
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- General Engineering & Computer Science (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention relates to a cast-in-situ bored pile construction process, which belongs to the technical field of building construction and adopts the technical scheme that the cast-in-situ bored pile construction process comprises the following steps: s1 construction preparation: leveling a construction site, compacting by tamping, and paving a road substrate at the operation position of a drilling machine; s2 pile casing embedding: excavating and removing soil within the embedding depth range of the pile casing at the hole site by adopting a rotary drilling bit, then directly pressing the pile casing into the soil after the pile casing is hoisted in place, wherein a plurality of reinforcing sheets are fixedly arranged on the outer wall of the pile casing along the axial direction, the reinforcing sheets are uniformly distributed along the circumferential direction of the pile casing, then, the outer side of the pile casing is tamped and compacted by clay, and the height of a water head in the pile casing is 1.0-1.5 m; s3 drilling with the rig in place: fixing a drilling machine on the road substrate; s4 drilling: during the drilling construction, the drill rod is slowly and continuously carried out, and a static mud retaining wall is adopted in the drilling process; s5, lowering a steel reinforcement cage: cleaning holes, and slowly and uniformly lowering the reinforcement cage section by section; s6 pouring concrete: the concrete is continuously poured by adopting a conduit method, so that the effect of improving the embedding stability of the pile casing is achieved.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to a cast-in-situ bored pile construction process.
Background
The cast-in-place pile is a pile which is manufactured by drilling a construction ground, then pouring concrete or reinforced concrete into the hole and solidifying the concrete or reinforced concrete.
The existing construction process of the cast-in-place pile comprises the steps of leveling a construction site, preparing slurry, embedding a pile casing at a hole position, installing and positioning a drilling machine, drilling holes, cleaning the holes after the drilling is finished, lowering a reinforcement cage, and finally pouring concrete.
The above prior art solutions have the following drawbacks: for the regions with loose soil texture, the soil layer is easy to deform under stress, so that the pile casing is not stably embedded, and the pile casing may incline or shift during later construction, thereby causing the drilling direction to be inclined, influencing the construction quality and even being incapable of being constructed.
Disclosure of Invention
The invention aims to provide a cast-in-situ bored pile construction process which has the effect of improving the embedding stability of a pile casing.
The technical purpose of the invention is realized by the following technical scheme:
a cast-in-situ bored pile construction process comprises the following steps:
s1 construction preparation: firstly, leveling a construction site, compacting, then paving a road substrate at the operation position of a drilling machine, and then preparing a slurry circulating system;
s2 pile casing embedding: excavating and removing soil within the embedding depth range of the pile casing at the hole site by adopting a rotary drilling bit, then directly pressing the pile casing into the soil after the pile casing is hoisted in place, wherein a plurality of reinforcing sheets are fixedly arranged on the outer wall of the pile casing along the axial direction, the reinforcing sheets are uniformly distributed along the circumferential direction of the pile casing, then, the outer side of the pile casing is tamped and compacted by clay, and the height of a water head in the pile casing is 1.0-1.5 m;
s3 drilling with the rig in place: fixing the drilling machine on the road substrate according to the drilling position;
s4 drilling: measuring the elevation of the casing before drilling, calculating the actual hole depth, drilling by using percussion drilling, slowly drilling by using a drill rod at a slow rotating speed during the hole opening construction, gradually accelerating normal drilling after the drill rod enters all holes, continuously performing drilling operation, and using static slurry to protect the wall during the drilling process;
s5, lowering a steel reinforcement cage: cleaning holes, then hoisting the steel reinforcement cage, slowly lowering the steel reinforcement cage section by section at a constant speed, and avoiding collision with the protective cylinder;
s6 pouring concrete: the concrete is poured by a conduit method, and the pouring process is continuously carried out.
By adopting the technical scheme, the road base plate is paved at the operation position of the drilling machine, so that the drilling machine can be more stably fixed on the road base plate, and the drilling machine is prevented from inclining due to instability in the drilling process, and the construction precision is improved. Clay is filled in the outer wall of the pile casing and is tamped, so that a soil layer at the mounting position of the pile casing is changed, the soil layer is prevented from being greatly deformed due to stress in the drilling process, and the embedding stability of the pile casing is improved; set up the vertical enhancement piece of a plurality of circumference on protecting a section of thick bamboo, make strengthen in the piece inserts the clay, increased the area of contact who protects a section of thick bamboo and clay, improved the joint strength who protects a section of thick bamboo and clay to further improved and protected a stability buried underground, prevent to protect a section of thick bamboo and take place the slope or shift when later stage construction, improved the precision of drilling. In addition, the reinforcing sheet is arranged, so that the structural strength and rigidity of the pile casing are improved, and the possibility of deformation of the pile casing is reduced. The water head height of 1.0m-1.5m is kept in the pile casing, and the soil layer is prevented from sinking due to overlarge water head difference between the inside and the outside of the pile casing, and the pile casing is prevented from inclining or shifting. The drilling process is continuous and slow, and the protection cylinder is prevented from inclining or displacing due to collapse of the hole wall. Keep slowly at the uniform velocity when steel reinforcement cage transfers to transfer section by section, avoid steel reinforcement cage collision to protect a section of thick bamboo and make and protect a section of thick bamboo slope or displacement, improved the precision of work progress, guarantee construction quality.
The present invention in a preferred example may be further configured to: and in the S4 drilling, controlling the specific gravity of the adopted slurry to be 1.05-1.15g/cm and carrying out high-speed ethanol harvest, controlling the viscosity to be 19-28 Pa.s, and controlling the sand content to be not more than 4% and the colloid content to be not less than 95%.
By adopting the technical scheme, the specific gravity of the slurry is controlled at 1.05-1.15g/cm for dry year, the viscosity of the slurry is controlled at 19-28 Pa.s, the sand content is not more than 4%, and the colloid rate is not less than 95%, so that the slurry can play a good stabilizing role on the hole wall, the hole wall collapse is avoided, the mud skin adsorbed on the hole wall can be prevented from being thick, the possibility of reducing the diameter of the drilled hole is reduced, and a drill bit of a drilling machine can be lubricated and cooled to a certain extent.
The present invention in a preferred example may be further configured to: and S1, preparing construction, namely lofting the pile position, burying the cross pile, enabling the cross pile to be higher than the top surface of the pile casing, and reinforcing the cross pile by using mortar or concrete.
Through adopting above-mentioned technical scheme, bury the cross fender pile underground to consolidate the protection with mortar or concrete, to the stake position is examined in the drilling process in preparation for, and the on-the-spot technical staff of being convenient for inspects at any time, guarantees that the cross fender pile does not take place the displacement, thereby ensures that the stake position does not take place the displacement, guarantees that the construction precision is not influenced.
The present invention in a preferred example may be further configured to: and (5) during the downward placement of the S5 steel reinforcement cage, cleaning the hole by adopting a slurry changing method, injecting the treated slurry into the hole, and changing the slurry containing the suspended drilling slag in the hole.
By adopting the technical scheme, the theoretical mud is a colloid and does not generate a precipitation phenomenon, and actually, the clay particles used for preparing the mud are much larger than ideal colloid particles, so the concentration of the mud can change along with the change of time, the longer the time is, the faster the settling speed of the soil particles in the mud is, the mud in the hole is cleaned by adopting a mud changing method, the processed mud is injected into the hole, and the mud containing the drilling slag of the suspension liquid in the hole is changed, so that a large amount of residual slag in the hole is avoided, and the influence on the strength of a pile body and the injection process of concrete is prevented.
The present invention in a preferred example may be further configured to: and the S5 steel bar cage lowering step further comprises the step of positioning and fixing the steel bar cage at the orifice after the lowering step is finished.
Through adopting above-mentioned technical scheme, transfer at the steel reinforcement cage and accomplish the back, locate to the steel reinforcement cage in drill way department and fix, avoid floating the cage phenomenon at the pouring concrete in-process, ensure steel reinforcement cage and hole site center coincidence.
The present invention in a preferred example may be further configured to: the S6 pouring the concrete further includes performing a secondary hole cleaning before pouring.
By adopting the technical scheme, the secondary hole cleaning is to calculate the thickness of the sediment, clean the sediment at the bottom of the hole, reduce the thickness of the sediment, adjust the performance of slurry and meet the pouring conditions, thereby ensuring the quality of poured concrete and ensuring the bearing capacity of the pile.
The present invention in a preferred example may be further configured to: and the S3 drilling machine in-place further comprises the steps of retesting the pile position before the drilling machine is in place, detecting the diameter of a drill bit, the inclination of a drill rod of the drilling machine, and whether the base and the top end of the drilling machine are stable, and controlling the deviation of the center of the drill bit and the center of the drill hole within the range of 2 cm.
Through adopting above-mentioned technical scheme, carry out retest to the stake position, can avoid influencing drilling because of stake position dislocation. The drill diameter and the drill rod inclination of the drilling machine and whether the base and the top end are stable or not are detected, and the construction precision of the drilling machine is guaranteed, so that the drilling quality and precision are guaranteed.
The present invention in a preferred example may be further configured to: s4 drilling also includes adopting cage type hole checking device to detect hole position, hole diameter, hole depth and inclination after drilling.
By adopting the technical scheme, the hole position, the hole diameter, the hole depth and the inclination are detected after drilling, the drilling precision is ensured, and the subsequent construction precision is ensured, so that the quality of the cast-in-place pile is prevented from being influenced.
In conclusion, the beneficial technical effects of the invention are as follows:
1. clay is filled in the outer wall of the pile casing and is tamped, so that a soil layer at the mounting position of the pile casing is changed, the soil layer is prevented from being greatly deformed due to stress in the drilling process, and the embedding stability of the pile casing is improved;
2. the reinforcing sheet is arranged on the casing, so that the reinforcing sheet is inserted into the clay, the contact area between the casing and the clay is increased, and the connection strength between the casing and the clay is improved, thereby further improving the embedding stability of the casing and preventing the casing from inclining or shifting during later construction;
3. after the reinforcing cage is placed and finished, the reinforcing cage is positioned and fixed at the orifice, and the floating cage phenomenon is avoided in the concrete pouring process.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of the casing;
fig. 3 is a construction state diagram of the poured concrete.
In the figure, 1, a casing; 11. a reinforcing sheet; 2. cross pile protection; 3. a drilling machine; 4. a road substrate; 5. clay; 6. a reinforcement cage; 7. and (6) pouring the pile.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
A cast-in-situ bored pile construction process comprises the following steps:
s1 construction preparation:
referring to fig. 1, firstly, the condition of the buried pipeline is explored, the buried pipeline is ensured to be not arranged at the drilling position, then the construction site is leveled and tamped tightly, the arrangement positions of a mud pit, a reinforcement cage 6, a guide pipe, a hopper and construction machinery are clearly planned, and the requirements of operation and displacement of a drilling machine 3, arrangement of a mud circulation system, concrete pouring operation and the like are met; then paving a road substrate 4 at the operation position of the drilling machine 3 to prevent the drilling machine 3 from being unstable in the drilling process, causing safety accidents and influencing the engineering quality; digging the mud pit, enclosing the mud pit, and preparing a mud circulating system; and finally, lofting the pile position, burying the cross pile 2 underground to enable the cross pile 2 to be higher than the top surface of the pile casing 1, reinforcing the cross pile 2 by using mortar or concrete, checking the pile position in the drilling process, conveniently checking by field technicians at any time and ensuring that the cross pile 2 cannot displace.
S2 embedding the casing 1:
referring to fig. 2, a rotary drilling bit is adopted to dig out soil within the embedding depth range of the pile casing 1 at the hole position, the pile casing 1 is hoisted in place and then directly pressed into the soil, clay 5 is filled in the outer wall of the pile casing 1, and tamping is carried out, so that the soil layer at the installation position of the pile casing 1 is changed, the soil layer is prevented from being stressed to deform greatly in the drilling process, and the embedding stability of the pile casing 1 is improved; the outer wall of the casing 1 is axially and fixedly provided with a plurality of reinforcing pieces 11, the reinforcing pieces 11 are uniformly distributed along the circumferential direction of the casing 1, so that the reinforcing pieces 11 are inserted into the clay 5, the contact area between the casing 1 and the clay 5 is increased, and the connection strength between the casing 1 and the clay 5 is improved, thereby improving the embedding stability of the casing 1 and preventing the casing 1 from inclining or shifting during later construction; the hole is formed at the proper height of the pile casing 1, so that the height of a water head in the pile casing 1 is 1.0m-1.5m, the soil layer is prevented from sinking due to the overlarge difference between the water head inside and outside the pile casing 1, the pile casing 1 is prevented from inclining or shifting, and the embedding stability of the pile casing 1 is improved.
referring to fig. 1, before a drilling machine 3 is in place, a measurer needs to retest a pile position, check various preparation works before drilling after the pile position is correct, detect whether the diameter of a drill bit, the inclination of a drill rod and the base and the top end of the drilling machine 3 are stable or not, ensure that the position deviation of the center of the drill bit and the center of the drill hole is controlled within a range of 2cm, and ensure the construction precision of the drilling machine 3, so that the drilling quality and precision are ensured.
S4 drilling:
referring to fig. 3, before drilling, the elevation of the casing 1 is measured, the actual hole depth is calculated, drilling is carried out by adopting percussion drilling, a drill rod slowly drills at a rotating speed during drilling construction, the rotating speed of a drill bit is not more than 10 revolutions per minute, normal drilling is gradually accelerated after the drill rod completely enters a hole, drilling operation is continuously carried out, hole sweeping times are increased in an easily retracted stratum, static slurry is adopted for wall protection in the drilling process, the specific gravity of the adopted slurry is controlled to be 1.05-1.15g/cm, the viscosity is controlled to be 19-28 Pa.s, the sand content is not more than 4%, the colloid rate is not less than 95%, the slurry can play a good stabilizing role in the hole wall, collapse of the hole wall is avoided, mud skin adsorbed on the hole wall can be prevented, and the possibility of hole drilling hole shrinkage is reduced. After drilling is completed, the cage type hole inspection device is adopted to detect hole positions, hole diameters, hole depths and gradient, so that the drilling precision is ensured, the subsequent construction precision is ensured, and the quality of the cast-in-place pile 7 is prevented from being influenced.
When small karst caves or cracks occur and the mud in the holes uniformly and slowly descends, a proper amount of cement can be added into the mud to increase the mud proportion and the wall protection effect; when a large karst cave is encountered, the mud in the hole drops sharply, and the hole can be drilled again after being backfilled by gravel and the like.
S5, lowering the reinforcement cage 6:
referring to fig. 3, firstly, cleaning the hole by adopting a slurry changing method, injecting the treated slurry into the hole, and changing the slurry containing suspended drilling slag in the hole, so as to avoid a large amount of sediment remained in the hole and prevent the influence on the strength of the pile body and the pouring process of concrete; then hoisting the reinforcement cage 6, slowly lowering the reinforcement cage 6 section by section at a constant speed, keeping the center of the reinforcement cage 6 consistent with the center of the pile, avoiding collision with the pile casing 1, avoiding the reinforcement cage 6 from colliding with the pile casing 1 to incline or displace the pile casing 1, and improving the precision of the construction process; after the completion of putting at steel reinforcement cage 6, fix a position and fix steel reinforcement cage 6 in drill way department, avoid floating the cage phenomenon at the pouring concrete in-process, ensure steel reinforcement cage 6 and hole site center coincidence.
S6 pouring concrete:
referring to fig. 3, secondary hole cleaning is carried out before filling, the amount of sediment is calculated at the hole bottom, the sediment at the hole bottom is cleaned to reduce the thickness of the sediment, then the sediment is checked and the slurry performance is adjusted until the specific gravity of the orifice return slurry and the thickness of the sediment meet the specification requirements; and then, pouring concrete by adopting a conduit method, wherein the pouring process is continuously carried out, and the burial depth of the conduit in the concrete is controlled to be 2-6m in the pouring process, so that the whole construction process of the cast-in-place pile 7 is completed.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (8)
1. A cast-in-situ bored pile construction process is characterized by comprising the following steps:
s1 construction preparation: firstly, leveling a construction site, compacting by tamping, then paving a road substrate (4) at the operation position of a drilling machine (3), and then preparing a slurry circulating system;
s2 embedding the pile casing (1): excavating the soil within the embedding depth range of the pile casing (1) at the hole position by adopting a rotary drilling bit, then directly pressing the pile casing (1) into the soil after hoisting the pile casing (1) in place, wherein a plurality of reinforcing sheets (11) are fixedly arranged on the outer wall of the pile casing (1) along the axial direction, the reinforcing sheets (11) are uniformly distributed along the circumferential direction of the pile casing (1), then compacting the pile casing (1) by using clay (5) at the outer side, and the height of a water head in the pile casing (1) is 1.0-1.5 m;
s3 drilling machine (3) in place: fixing the drilling machine (3) on the road base plate (4) according to the drilling position;
s4 drilling: the elevation of the protective cylinder (1) is measured before drilling, the actual hole depth is calculated, percussion drilling is adopted for drilling, a drill rod slowly drills at a low rotating speed during tapping construction, normal drilling is gradually accelerated after the drill rod enters all holes, drilling operation is continuously carried out, and static slurry is adopted for wall protection in the drilling process;
s5, lowering the steel reinforcement cage (6): cleaning holes, then hoisting the reinforcement cage (6), slowly lowering the reinforcement cage section by section at a constant speed, and avoiding collision with the protective cylinder (1);
s6 pouring concrete: the concrete is poured by a conduit method, and the pouring process is continuously carried out.
2. The cast-in-situ bored pile construction process according to claim 1, wherein in the S4 drilling, the specific gravity of the slurry is controlled to be 1.05-1.15g/cm for cultivation, the viscosity is controlled to be 19-28 Pa.s, the sand content is not greater than 4%, and the colloid content is not less than 95%.
3. A bored pile construction process according to claim 1, wherein said S1 construction preparation further comprises setting out a pile position, burying the cross piles (2) so that the cross piles (2) are higher than the top surface of the casing (1), and reinforcing the cross piles (2) with mortar or concrete.
4. The cast-in-situ bored pile construction process according to claim 1, wherein the S5 steel reinforcement cage (6) is lowered, hole cleaning is performed by a slurry changing method, treated slurry is injected into the hole, and slurry containing suspended drilling slag in the hole is changed.
5. The cast-in-situ bored pile construction process according to claim 1, wherein the step of lowering the S5 reinforcement cage (6) further comprises positioning and fixing the reinforcement cage (6) at the opening.
6. The cast-in-situ bored pile construction process according to claim 1, wherein the step of S6 pouring concrete further includes performing secondary hole cleaning before pouring.
7. A bored pile construction process according to claim 1, wherein the S3 is performed by re-measuring the position of the pile before the drilling machine (3) is in place, and controlling the deviation of the position of the drill center from the position of the drill center to be within 2cm for the drill diameter, the inclination of the drill rod, and whether the base and the top of the drilling machine (3) are stable.
8. A bored pile construction process according to claim 1, wherein the S4 drilling further comprises detecting hole location, hole diameter, hole depth and inclination using a cage type hole detector after drilling.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010060377.1A CN111206576A (en) | 2020-01-19 | 2020-01-19 | Cast-in-situ bored pile construction process |
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| CN202010060377.1A CN111206576A (en) | 2020-01-19 | 2020-01-19 | Cast-in-situ bored pile construction process |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111733801A (en) * | 2020-06-28 | 2020-10-02 | 中冶地集团西北岩土工程有限公司 | Construction process of rotary drilling bored concrete pile in soft geology |
| CN111809615A (en) * | 2020-08-17 | 2020-10-23 | 上海两港市政工程有限公司 | Heavy pile machine load underpinning structure and construction method thereof |
| CN112878315A (en) * | 2020-06-03 | 2021-06-01 | 富利建设集团有限公司 | End-bearing rotary-digging hole-forming cast-in-place pile based on Civil 3D technology and construction method |
| CN112900419A (en) * | 2021-01-25 | 2021-06-04 | 广州建筑产业开发有限公司 | Slurry wall protection construction method |
| CN114508097A (en) * | 2022-03-22 | 2022-05-17 | 中铁十一局集团有限公司 | Rotary drilling construction method for railway line slope pile foundation |
| CN114541436A (en) * | 2022-04-02 | 2022-05-27 | 中铁二院昆明勘察设计研究院有限责任公司 | Rectangular anti-slide pile forming method for soft soil section |
| CN115094881A (en) * | 2022-06-13 | 2022-09-23 | 中国华西企业股份有限公司 | Construction process and equipment for mechanical pore-forming and manual pore-cleaning engineering pile |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112878315A (en) * | 2020-06-03 | 2021-06-01 | 富利建设集团有限公司 | End-bearing rotary-digging hole-forming cast-in-place pile based on Civil 3D technology and construction method |
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| CN111809615A (en) * | 2020-08-17 | 2020-10-23 | 上海两港市政工程有限公司 | Heavy pile machine load underpinning structure and construction method thereof |
| CN112900419A (en) * | 2021-01-25 | 2021-06-04 | 广州建筑产业开发有限公司 | Slurry wall protection construction method |
| CN114508097A (en) * | 2022-03-22 | 2022-05-17 | 中铁十一局集团有限公司 | Rotary drilling construction method for railway line slope pile foundation |
| CN114541436A (en) * | 2022-04-02 | 2022-05-27 | 中铁二院昆明勘察设计研究院有限责任公司 | Rectangular anti-slide pile forming method for soft soil section |
| CN115094881A (en) * | 2022-06-13 | 2022-09-23 | 中国华西企业股份有限公司 | Construction process and equipment for mechanical pore-forming and manual pore-cleaning engineering pile |
| CN115094881B (en) * | 2022-06-13 | 2023-11-21 | 中国华西企业股份有限公司 | Construction process and equipment for mechanical pore-forming artificial pore-cleaning engineering pile |
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Application publication date: 20200529 |