CN117488804A - Construction method for cleaning and controlling sediment of large-diameter pier foundation - Google Patents
Construction method for cleaning and controlling sediment of large-diameter pier foundation Download PDFInfo
- Publication number
- CN117488804A CN117488804A CN202311488401.1A CN202311488401A CN117488804A CN 117488804 A CN117488804 A CN 117488804A CN 202311488401 A CN202311488401 A CN 202311488401A CN 117488804 A CN117488804 A CN 117488804A
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- Prior art keywords
- sediment
- steel
- rock
- pile
- foundation
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- 239000013049 sediment Substances 0.000 title claims abstract description 73
- 238000010276 construction Methods 0.000 title claims abstract description 28
- 238000004140 cleaning Methods 0.000 title claims abstract description 21
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 53
- 239000010959 steel Substances 0.000 claims abstract description 53
- 239000011435 rock Substances 0.000 claims abstract description 48
- 238000005553 drilling Methods 0.000 claims abstract description 32
- 238000000034 method Methods 0.000 claims abstract description 28
- 230000000694 effects Effects 0.000 claims abstract description 13
- 230000001681 protective effect Effects 0.000 claims description 9
- 238000003466 welding Methods 0.000 claims description 9
- 238000010009 beating Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 239000002689 soil Substances 0.000 abstract description 8
- 238000004080 punching Methods 0.000 abstract description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 206010008190 Cerebrovascular accident Diseases 0.000 description 1
- 208000006011 Stroke Diseases 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010438 granite Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D13/00—Accessories for placing or removing piles or bulkheads, e.g. noise attenuating chambers
- E02D13/08—Removing obstacles
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
-
- 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
Abstract
The invention relates to a construction method for cleaning and controlling sediment of a foundation of a large-diameter pier; before pile foundation construction, a rotary drilling rig and a drilling and pulling machine matched with project rock entering strength are selected, and lofting is measured: each pile position is fixed and placed by a GPS according to the design requirement; burying a steel pile casing, wherein the buried steel pile casing penetrates through the crushed pebble layer to enter strong wind for at least 2 meters, and the steel pile casing is constructed by adopting a beating-pulling-level vibrating hammer; when the drilling machine is in place, the ground is flattened, compacted and paved with steel plates, the drill rod is adjusted to be vertical, and the center of the drilling hole is ensured to meet the design requirement. The method is based on the existing technological process, and the pile casing method is added before pier foundation punching, so that the hole forming efficiency is effectively improved, hole wall soil disturbance is reduced, and sediment control effect is improved.
Description
Technical Field
The invention relates to the technical field of foundation construction, in particular to a large-diameter pier foundation construction technology, and specifically relates to a large-diameter pier foundation sediment cleaning control construction method.
Background
Nowadays, pile foundation design of house building engineering generally adopts bored concrete piles or precast piles, the diameter of precast pile is generally different between 300 mm-1000 mm, the diameter of bored concrete piles is generally 600 mm-1500 mm (more than 1500mm is generally used for municipal bridge engineering piles). Aiming at the conventional pile foundation engineering, the current construction process is mature, the construction quality also has good guarantee measures, but the effective quality guarantee measures of the large-diameter cast-in-place pile with the diameter of 1600mm are few under the working condition that the geology is complex and the rock stratum has large fluctuation. The current method is consistent with the common 600-1500 mm bored pile construction process, and by adopting the method, the risk of hole collapse is increased, and the hole forming and hole cleaning efficiency is low.
Disclosure of Invention
The invention aims to overcome the defects, and provides a pier foundation construction process with large diameter (1600 mm and above) on the premise of harder rock aiming at complex geology (large fluctuation of underground rock stratum, maximum height difference of 10m, and pile foundation bearing layer of 10-3B layer: apoplexy granite, and standard value of rock saturated uniaxial compressive strength of 53.2 MPa).
In order to achieve the above object, the present invention is achieved by:
a construction method for cleaning and controlling sediment of a large-diameter pier foundation comprises the following steps of
Step 1, mechanical type selection: before pile foundation construction, a rotary drilling rig matched with the rock entering strength of the project is selected, and a drilling and pulling machine matched with a rock stratum is selected because a steel casing is needed to be arranged in the follow-up process, and the 450-type drilling and pulling machine is selected in the project;
step 2, measuring and lofting: each pile position is fixed by GPS according to the design requirement, and is implemented after rechecking by the measurement of the relevant unit;
step 3, embedding a steel pile casing: in order to improve the pore-forming effect, a method of embedding a steel casing is adopted, and a thickened steel ring is adopted for welding a top ring of the casing, so that the casing is prevented from deforming during the beating and drawing; when the underground water level is higher, the buried steel casing penetrates through the crushed pebble layer to enter strong weathered for at least 2 meters, so that hole collapse is reduced; because the pier foundation piles are short, the steel pile casings with sufficient lengths are configured on site in combination with the land survey report until the steel pile casings are driven to the top surface of the bedrock; the steel pile casing is rolled by adopting a steel plate with the thickness of 18mm, and the diameter is the same as the designed pile diameter; the top ring of the protective cylinder is welded by a thickened steel ring, so that the protective cylinder and the edge cannot deform when the protective cylinder is pulled out; the steel pile casing is constructed by adopting a beating-pulling-level vibrating hammer;
step 4: and (3) positioning a drilling machine: firstly, ensuring that the foundation under the drilling machine does not sink, when the drilling machine is in place, firstly leveling, compacting and paving a steel plate on the ground, adjusting a drill rod vertically, then checking whether the pile center newly defined after the pile casing is embedded coincides with the drill bit center, and if the deviation is larger, adjusting the position of the drilling machine, so as to ensure that the center of the drilled hole meets the design requirement.
The construction method for cleaning and controlling the sediment of the foundation of the large-diameter pier is characterized by comprising the following steps of: it comprises a bottom plate connecting part, a rock sediment crushing part and a rock sediment collecting part. The bottom plate connecting part is connected with the bottom plate of the sediment collecting barrel through welding, and the rock sediment crushing part is welded on two sides of the bottom plate connecting part in a mutually perpendicular mode by 2 high-strength steel plates. The rock sediment collecting part consists of 2 pentagonal steel plates, and 2 right-angle sides of the pentagonal steel plates are respectively connected with the sediment collecting barrel bottom plate and the rock sediment crushing part by welding;
when the drill bit rotates, firstly, the rock sediment breaking part breaks the rock for the first time, and as the drill bit continuously descends, the rock sediment breaking part breaks the rock for the second time, and meanwhile, the drill bit rotates to collect the broken rock sediment into the sediment collecting barrel.
The construction method for cleaning and controlling the sediment of the foundation of the large-diameter pier is characterized by comprising the following steps of: the rock sediment crushing part adopts a blade made of high-strength steel.
According to the invention, on the basis of the existing technological process, a pile casing method is added before the pier foundation is perforated, and drilling is carried out within the range of the steel pile casing, so that soil body can be prevented from moving around, then the bottom of a hole is cleaned in the pile casing, then the pile casing is pulled out, the hole forming efficiency is effectively improved, hole wall soil disturbance is reduced, and the sediment control effect is improved; then, by a method of leading holes and then drilling holes, the drilling speed is improved, the disturbance of soil mass on the hole wall is reduced, and the sediment control effect is improved; and finally, a drilling sediment crushing and collecting synchronous method is utilized, so that sediment collecting efficiency and effect are greatly improved.
The series of methods adopted by the invention have remarkable improvement effect in improving the hole opening efficiency, controlling the fine sediment and cleaning the sediment efficiently. And a new construction process is developed by utilizing the existing partial process foundation, so that the construction efficiency is high, the construction quality is also greatly ensured, and the pile forming quality of the whole pier foundation is well ensured.
Drawings
FIG. 1 is a schematic view of a sediment removal assembly.
Detailed Description
The invention is further illustrated by the following specific examples.
A construction method for cleaning and controlling sediment of a large-diameter pier foundation comprises the following steps of
Step 1, mechanical type selection: before pile foundation construction, a rotary drilling rig matched with the rock entering strength of the project is selected, and a drilling and pulling machine matched with a rock stratum is selected because a steel casing is needed to be arranged in the follow-up process, and the 450-type drilling and pulling machine is selected in the project;
step 2, measuring and lofting: each pile position is fixed by GPS according to the design requirement, and is implemented after rechecking by the measurement of the relevant unit;
step 3, embedding a steel pile casing: in order to improve the pore-forming effect, a method of embedding a steel casing is adopted, and a thickened steel ring is adopted for welding a top ring of the casing, so that the casing is prevented from deforming during the beating and drawing; when the underground water level is higher, the buried steel casing penetrates through the crushed pebble layer to enter strong weathered for at least 2 meters, so that hole collapse is reduced; because the pier foundation piles are short, the steel pile casings with sufficient lengths are configured on site in combination with the land survey report until the steel pile casings are driven to the top surface of the bedrock; the steel pile casing is rolled by adopting a steel plate with the thickness of 18mm, and the diameter is the same as the designed pile diameter; the top ring of the protective cylinder is welded by a thickened steel ring, so that the protective cylinder and the edge cannot deform when the protective cylinder is pulled out; the steel pile casing is constructed by adopting a beating-pulling-level vibrating hammer;
step 4: and (3) positioning a drilling machine: firstly, ensuring that the foundation under the drilling machine does not sink, when the drilling machine is in place, firstly leveling, compacting and paving a steel plate on the ground, adjusting a drill rod vertically, then checking whether the pile center newly defined after the pile casing is embedded coincides with the drill bit center, and if the deviation is larger, adjusting the position of the drilling machine, so as to ensure that the center of the drilled hole meets the design requirement.
The sediment cleaning device in the bored pile construction method of the large straight pier comprises a bottom plate connecting part 1, a rock sediment crushing part 2 and a rock sediment collecting part. The bottom plate connecting part 1 is connected with the bottom plate of the sediment collecting barrel through welding, and the rock sediment crushing part is welded on two sides of the bottom plate connecting part 1 in a mutually perpendicular mode by 2 high-strength steel plates. The rock sediment collecting part 3 consists of 2 pentagonal steel plates, and the 2 right-angle sides of the pentagonal steel plates are respectively connected with the sediment collecting barrel bottom plate and the rock sediment crushing part 2 through welding;
when the drill bit rotates, firstly, the rock sediment breaking part breaks the rock for the first time, and as the drill bit continuously descends, the rock sediment breaking part breaks the rock for the second time, and meanwhile, the drill bit rotates to collect the broken rock sediment into the sediment collecting barrel.
The rock sediment crushing part adopts a blade made of high-strength steel.
The sediment cleaning device can be used for effectively smashing rock and soil sediment for 2 times, so that the volume of the rock sediment is reduced, the smashed rock sediment is pushed into the sediment collecting barrel by means of the thrust of the rotation of the drill bit, the sediment hole cleaning effect of the rock and soil sediment is effectively improved, the sediment thickness of a pile hole is reduced, and the pouring quality is further improved.
According to the invention, on the basis of the existing process flow, the pile casing method is added before pier foundation punching, so that the hole forming efficiency is effectively improved, the hole wall soil disturbance is reduced, and the sediment control effect is improved; then, by a method of leading holes and then drilling holes, the drilling speed is improved, the disturbance of soil mass on the hole wall is reduced, and the sediment control effect is improved; and finally, a drilling sediment crushing and collecting synchronous method is utilized, so that sediment collecting efficiency and effect are greatly improved.
The series of methods adopted by the invention have remarkable improvement effect in improving the hole opening efficiency, controlling the fine sediment and cleaning the sediment efficiently. And a new construction process is developed by utilizing the existing partial process foundation, so that the construction efficiency is high, the construction quality is also greatly ensured, and the pile forming quality of the whole pier foundation is well ensured.
Claims (4)
1. A construction method for cleaning and controlling sediment of a large-diameter pier foundation is characterized by comprising the following steps: comprising
Step 1, mechanical type selection: before pile foundation construction, a rotary drilling rig matched with the rock entering strength of the project is selected, and a drilling and pulling machine matched with a rock stratum is selected because a steel casing is needed to be arranged in the follow-up process, and the 450-type drilling and pulling machine is selected in the project;
step 2, measuring and lofting: each pile position is fixed by GPS according to the design requirement, and is implemented after rechecking by the measurement of the relevant unit;
step 3, embedding a steel pile casing: in order to improve the pore-forming effect, a method of embedding a steel casing is adopted, and a thickened steel ring is adopted for welding a top ring of the casing, so that the casing is prevented from deforming during the beating and drawing; when the underground water level is higher, the buried steel casing penetrates through the crushed pebble layer to enter strong weathered for at least 2 meters, so that hole collapse is reduced; because the pier foundation piles are short, the steel pile casings with sufficient lengths are configured on site in combination with the land survey report until the steel pile casings are driven to the top surface of the bedrock; the steel pile casing is rolled by adopting a steel plate with the thickness of 18mm, and the diameter is the same as the designed pile diameter; the top ring of the protective cylinder is welded by a thickened steel ring, so that the protective cylinder and the edge cannot deform when the protective cylinder is pulled out; the steel pile casing is constructed by adopting a beating-pulling-level vibrating hammer;
step 4: and (3) positioning a drilling machine: firstly, ensuring that the foundation under the drilling machine does not sink, when the drilling machine is in place, firstly leveling, compacting and paving a steel plate on the ground, adjusting a drill rod vertically, then checking whether the pile center newly defined after the pile casing is embedded coincides with the drill bit center, and if the deviation is larger, adjusting the position of the drilling machine, so as to ensure that the center of the drilled hole meets the design requirement.
2. The construction method for cleaning and controlling the sediment of the foundation of the large-diameter pier according to claim 1, which is characterized by comprising the following steps: and cleaning holes through a large-diameter pier foundation sediment cleaning device.
3. The construction method for cleaning and controlling the sediment of the foundation of the large-diameter pier according to claim 2, which is characterized in that: the large-diameter pier foundation sediment cleaning device comprises a bottom plate connecting part (1), a rock sediment crushing part (2) and a rock sediment collecting part. The bottom plate connecting part (1) is connected with the bottom plate of the sediment collecting barrel through welding, and the rock sediment crushing part is welded on two sides of the bottom plate connecting part (1) through 2 high-strength steel plates in a mutually perpendicular mode. The rock sediment collecting part (3) consists of 2 pentagonal steel plates, and 2 right-angle sides of the pentagonal steel plates are respectively connected with a sediment collecting barrel bottom plate and the rock sediment crushing part (2) through welding;
when the drill bit rotates, firstly, the rock sediment breaking part breaks the rock for the first time, and as the drill bit continuously descends, the rock sediment breaking part breaks the rock for the second time, and meanwhile, the drill bit rotates to collect the broken rock sediment into the sediment collecting barrel.
4. A large straight pier bored pile sediment cleaning apparatus according to claim 3, wherein: the rock sediment crushing part adopts a blade made of high-strength steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311488401.1A CN117488804A (en) | 2023-11-09 | 2023-11-09 | Construction method for cleaning and controlling sediment of large-diameter pier foundation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311488401.1A CN117488804A (en) | 2023-11-09 | 2023-11-09 | Construction method for cleaning and controlling sediment of large-diameter pier foundation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117488804A true CN117488804A (en) | 2024-02-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311488401.1A Pending CN117488804A (en) | 2023-11-09 | 2023-11-09 | Construction method for cleaning and controlling sediment of large-diameter pier foundation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117488804A (en) |
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2023
- 2023-11-09 CN CN202311488401.1A patent/CN117488804A/en active Pending
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