CN114753354A - Water-rich sandy gravel geological pile forming construction method - Google Patents
Water-rich sandy gravel geological pile forming construction method Download PDFInfo
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- CN114753354A CN114753354A CN202210421142.XA CN202210421142A CN114753354A CN 114753354 A CN114753354 A CN 114753354A CN 202210421142 A CN202210421142 A CN 202210421142A CN 114753354 A CN114753354 A CN 114753354A
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- 238000010276 construction Methods 0.000 title claims abstract description 42
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 27
- 230000001681 protective effect Effects 0.000 claims abstract description 56
- 238000005553 drilling Methods 0.000 claims abstract description 47
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 22
- 239000010959 steel Substances 0.000 claims abstract description 22
- 238000004140 cleaning Methods 0.000 claims abstract description 12
- 230000002787 reinforcement Effects 0.000 claims abstract description 11
- 238000011835 investigation Methods 0.000 claims abstract description 5
- 239000002689 soil Substances 0.000 claims description 14
- 239000011435 rock Substances 0.000 claims description 8
- 239000004927 clay Substances 0.000 claims description 6
- 239000004576 sand Substances 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 3
- 238000005056 compaction Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 16
- 238000009434 installation Methods 0.000 abstract description 8
- 239000000463 material Substances 0.000 abstract description 7
- 239000013049 sediment Substances 0.000 abstract description 6
- 238000002360 preparation method Methods 0.000 abstract description 4
- 238000003912 environmental pollution Methods 0.000 abstract description 3
- 230000008520 organization Effects 0.000 abstract description 3
- 239000010410 layer Substances 0.000 description 10
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 2
- 235000017491 Bambusa tulda Nutrition 0.000 description 2
- 241001330002 Bambuseae Species 0.000 description 2
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 2
- 239000011425 bamboo Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 210000003205 muscle Anatomy 0.000 description 1
- 238000009527 percussion Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
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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
-
- 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
- E02D15/08—Sinking workpieces into water or soil inasmuch as not provided for elsewhere
-
- 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
- E02D5/385—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds with removal of the outer mould-pipes
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
- E21B33/138—Plastering the borehole wall; Injecting into the formation
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
- E21B7/10—Correction of deflected boreholes
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- Physics & Mathematics (AREA)
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- Civil Engineering (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a water-rich sandy gravel geological pile hole forming construction method, which comprises the following steps: the method comprises the following steps of construction investigation, paying off and positioning of a pile, installation and positioning of a protective casing, primary drilling, installation of the protective casing (1), secondary drilling, hole cleaning and hoisting of a steel reinforcement cage lamp, wherein the method comprises the steps of full construction investigation, preparation of a material of the protective casing in advance, optimized material preparation by combining with construction organization, saving of processing and coring time of the protective casing, and generally, the whole installation is carried out, so that the forming efficiency of the protective wall is high; drilling twice, and the hole forming part influenced by rich water follows up the protective casing, so that the installation time of the protective casing is greatly saved; and the steel wire mesh can effectively reduce the time for lowering the steel bar holes and cleaning the sediment at the bottom of the pile. The method has the advantages of high construction efficiency, small environmental pollution, high safety coefficient and guaranteed quality, and is suitable for hole forming construction of the water-rich sandy gravel geological rock-socketed rotary excavating pile.
Description
Technical Field
The invention relates to the technical field of technical facility construction, in particular to a water-rich sandy pebble geological pile forming construction method.
Background
Common pile foundations can be classified into a spiral drilling machine hole forming method, a percussion drilling machine hole forming method, a rotary drilling hole forming method and a manual hole digging method according to different hole forming processes. The auger pore-forming is mainly suitable for the construction of filling soil, cohesive soil, silt, sandy soil and gravel layers above the ground water level, has higher requirement on geological conditions and has high pore-forming efficiency. The application range of impact pore-forming is wider, but the problems of high noise and large environmental pollution exist. The rotary drilling rig is generally suitable for clay, silt, sandy soil, mucky soil, artificial backfill soil and strata containing partial pebbles and gravels, and is wide in construction application. The manual hole digging is generally suitable for clay with good soil quality and low underground water level and clay layers containing a small amount of sand and pebbles, has higher safety risk, but has good hole forming quality and is more applied to places where hole forming machinery cannot reach.
For some foundations near rivers, the underlying bedrock is sandy mudstone which is generally divided into a strong weathering zone and a medium weathering zone, the upper part of the bedrock is sand gravel, underground water exists, the influence on construction is large, and no good pile hole forming method exists for the geological.
Disclosure of Invention
In view of the above, the invention provides a water-rich sandy gravel geological pile hole-forming construction method.
The technical scheme is as follows: a water-rich sandy gravel geological pile hole forming construction method is characterized by comprising the following steps:
s1 construction investigation: surveying the position of a pile hole, carrying out advanced geological drilling, and preparing a protective casing (1) according to the drilling result, wherein the length of the protective casing is L;
s2 paying off and positioning: discharging the central point of the pile hole in the field;
s3, installing and positioning protective sleeves: installing a positioning pile casing outside the pile hole, and backfilling clay after the positioning pile casing is buried in place to ensure that the pile casing is straight;
s4 one-time drilling: after the pile position is rechecked, a rotary drilling rig is adopted for drilling for one time, and the drilling is stopped when slight hole collapse occurs;
s5, mounting a protective casing: putting the protective casing to the strongly weathered layer;
s6 secondary drilling: and after the protective casing is placed, secondary drilling is carried out until the pile length is designed.
By adopting the technical scheme, the method has the following advantages: the construction survey is sufficient, the casing material is prepared in advance, the material preparation can be optimized by combining with the construction organization, the processing and coring time of the casing is saved, and the whole installation is realized under the general condition, so that the forming efficiency of the casing is high; drilling twice, and the hole forming part affected by rich water only follows the protective cylinder, so that the installation time of the protective cylinder is greatly saved.
Preferably, the method comprises the following steps:
the top elevation of the protective protection casing (1) is higher than the positioning protection casing (2), and the length L of the protective protection casing is equal to the depth of a rock entering section plus the depth of a sand and gravel section plus the top elevation of the protective protection casing. By adopting the scheme, the length of the protective casing fully meets the protection of the water-rich foundation.
The depth of the rock entering section is not less than 500mm, and the top elevation of the protective casing is not less than 600 mm. By adopting the scheme, the insertion depth of the protective casing is enough, and the part of the top which is higher than the protective casing is also beneficial to the later-stage pulling-out.
And (4) drilling until the designed pile length is reached, then cleaning the hole, then hoisting a reinforcement cage, and performing post pile-forming construction.
The lower part of the steel reinforcement cage is covered by steel wire meshes in a wrapping mode, and the covering length of the steel wire meshes is from the hole bottoms of the pile holes to the protective pile casing direction until the covering length exceeds the lower opening 2m of the protective pile casing. By adopting the scheme, the installed steel wire mesh can effectively avoid continuous sediment caused by the leakage of sand and pebbles from the lower opening of the pile casing in the construction intermission time before concrete pouring after hole cleaning is finished, so that the time for lowering the steel bar holes and cleaning the sediment at the bottom of the pile can be effectively reduced.
In step S3, the elevation of the top of the positioning pile casing is not less than 300mm higher than the ground, the allowable deviation of the central vertical line of the positioning pile casing and the plane of the central line of the pile hole is not more than 50mm, and the inclination of the vertical line is not more than 1%.
In the step S4, the deviation between the center of a drill rod of the drilling machine and the center of a positioning protective cylinder is not more than 5cm, and the deviation between the center of a drill bit and the center of the positioning protective cylinder is not more than 2 cm;
the slight hole collapse indicates that the drilling speed is increased, the footage is reduced, and the soil output is increased.
Before setting out and positioning the piles, the field needs to be leveled, sundries are removed, soft soil is removed, and leveling and compaction are carried out, so that the elevation of the field is basically consistent with the calibration of the basic raft.
The post pile-forming construction is carried out according to the following steps: and pouring concrete underwater, and immediately pulling out the protective casing after pouring.
Compared with the prior art, the invention has the beneficial effects that: the construction survey is sufficient, the casing material is prepared in advance, the material preparation can be optimized by combining with the construction organization, the processing and coring time of the casing is saved, and the whole installation is realized under the general condition, so that the forming efficiency of the casing is high; drilling twice, and the hole forming part influenced by rich water follows up the protective casing, so that the installation time of the protective casing is greatly saved; and the steel wire mesh can effectively reduce the time for lowering the steel bar holes and cleaning the sediment at the bottom of the pile. The method has the advantages of high construction efficiency, small environmental pollution, high safety coefficient and guaranteed quality, and is suitable for hole forming construction of the water-rich sandy gravel geological rock-socketed rotary excavating pile.
Drawings
FIG. 1 is a schematic view of a foundation structure used in the present invention;
FIG. 2 is an enlarged view of portion A of FIG. 1;
fig. 3 is an enlarged view of a portion B in fig. 1.
Detailed Description
The present invention will be further described with reference to the following examples and the accompanying drawings.
As shown in fig. 1-3, a water-rich sandy gravel geological pile hole-forming construction method is specifically explained on the basis of the following geology: the geological underburden is sandy mudstone and is divided into a strong weathering zone D2 and a medium weathering zone D1, the thickness of a strong weathering zone D2 is 0.5-3.0 m, a bottom boundary fluctuates along with the fluctuation of a bedrock surface, the weathering is strong, a rock core is broken, a rock core of a medium weathering zone D1 is relatively complete and is mostly columnar or short-column-shaped, a medium weathering zone D1 is positioned below a strong weathering zone D2, the boundary of the medium weathering zone D1 and the strong weathering zone D2 is F2, the upper covering layer of the underburden is a sand gravel backfill layer D3, the boundary of a D3 layer and a D2 layer is F1, the underground water in the site is directly influenced by river water level, and the underground water has relatively large influence on construction.
The method comprises the following steps:
s1 construction investigation: performing advanced geological drilling according to a mode of separating piles from one hole by combining geological detail exploration pile hole sites, wherein the actual hole spacing is 2.4-10m, an exploration point is positioned in the center of a pile, an exploration hole is required to enter a middle weathering zone, the hole depth enters a middle weathering zone layer by 3D + max (3D,5m), the geological boundary height and the existence of a weak interlayer, a fracture zone and cave distribution in rock strata of the middle weathering zone are determined, and a protective casing 1 is prepared according to the drilling result, wherein the length of the protective casing is L, L is the depth of a rock entering section H1+ the depth of a sandy gravel section + the height of the protective casing 1, H1 is not less than 500mm, the height of the top of the protective casing 1 is not less than 600mm, and the depth of the sandy gravel section is the depth of a sandy gravel backfill layer D3;
s2 paying off and positioning: leveling the field, clearing sundries, changing soft soil, leveling and compacting, making the field elevation basically consistent with the calibration of a basic raft, discharging the central point of a pile hole on the spot, and allowing the deviation of pile position lofting to be: 20mm of grouped piles and 10mm of single-row piles;
s3, installing and positioning protective sleeves: installing a positioning pile casing 2 outside a pile hole, wherein the top elevation of the positioning pile casing 2 is not less than 300mm higher than the ground, the allowable deviation of a central vertical line of the positioning pile casing 2 and a central line plane of the pile hole is not more than 50mm, the inclination of the vertical line is not more than 1%, after the positioning pile casing 2 is embedded in place, clay is symmetrically and uniformly backfilled around the positioning pile casing 2, the compactness of filled soil is ensured, and the inclination of the pile casing is prevented;
s4 one-time drilling: the drilling machine is in place, the deviation between the center of a drill rod of the drilling machine and the center of the positioning protective cylinder 2 is not more than 5cm, and the deviation between the center of a drill bit and the center of the positioning protective cylinder 2 after the drilling machine is positioned is not more than 2 cm; after the pile position is rechecked, a rotary drilling rig is adopted for primary drilling, the drilling is stopped when slight hole collapse occurs, the slight hole collapse indicates that the drilling speed is increased, the footage is reduced, the soil output is increased, and the primary drilling is stopped at the moment;
s5, mounting the protective casing 1: the protective protection cylinder 1 is made of steel materials and is formed by welding N sections of standard sections, N is a natural number, the length of each section of standard section can be adjusted according to actual conditions, in the embodiment, each section of standard section is 9m long, the length of each section of standard section is 900mm (delta is 12mm), the height of the top of the protective protection cylinder 1 is higher than that of the positioning protection cylinder 2 by no less than 300mm, a steel plate covers the periphery of the top opening of the uppermost section of standard section for reinforcement, the strength of the opening of the protective protection cylinder 1 is improved, the protective protection cylinder 1 is placed to a strong weathering layer D2 in a pile press or hydraulic vibration hammer and crawler crane downward pressing mode, and the depth of the protective protection cylinder 1 in D2 is no less than 500 mm;
s6 secondary drilling: after the protective casing 1 is placed, secondary drilling is carried out until the pile length is designed, an electronic control system of a rotary drilling rig can display and adjust the verticality of the drill rod, meanwhile, verticality meters are arranged on two side surfaces of the drill rod, a specially-assigned person observes the two verticality meters in the drilling process, a manipulator is commanded to adjust the verticality of the drill rod at any time, and the verticality of the drill rod is ensured through electronic control and manual observation, so that the verticality of a formed hole is ensured;
s7 hole cleaning: drilling to a designed height, checking the hole diameter, the hole depth, the hole position, the hole shape, the verticality and the like to confirm that the drilled hole is qualified, and then cleaning the hole, wherein the hole cleaning method is to leave the drilling bucket in the original place and mechanically rotate for a plurality of circles, to put sediment at the bottom of the hole into a rotary excavating bucket as much as possible, to lift the drill and throw away slag, the hole cleaning must be thorough, the thickness of the sediment at the bottom of the hole is controlled to be not more than 50mm, and the method of deepening the drilled hole is forbidden to replace the hole cleaning;
s8, hoisting a reinforcement cage, and performing post pile-forming construction: steel reinforcement cage's lower part adopts the steel wire net parcel to cover, the cover length of steel wire net is toward for the hole bottom from the stake hole 1 direction of protecting protects a section of thick bamboo and covers to surpassing the protection and protect 1 lower nozzle 2m of a section of thick bamboo, and its length is shown as H2 in figure 1, the specification and size of steel wire net is 0.3mm, 30 x 30 mesh, and the welding has "barb" to prevent steel reinforcement cage come-up on the steel reinforcement cage owner muscle, and 3-4 "barb" are welded to the same cross-section of steel reinforcement cage.
The post pile-forming construction is carried out according to the following steps: and underwater concrete is poured, and after the pouring is finished, the protective casing 1 is immediately pulled out.
Finally, it should be noted that the above-mentioned description is only a preferred embodiment of the present invention, and those skilled in the art can make various similar representations without departing from the spirit and scope of the present invention.
Claims (9)
1. A water-rich sandy gravel geological pile hole forming construction method is characterized by comprising the following steps:
s1 construction investigation: surveying the position of a pile hole, carrying out advanced geological drilling, and preparing a protective casing (1) according to the drilling result, wherein the length of the protective casing is L;
s2 paying off and positioning: discharging the central point of the pile hole in the field;
s3, installing and positioning protection sleeves: installing a positioning pile casing (2) outside the pile hole, and backfilling clay after the positioning pile casing (2) is buried in place to ensure that the pile is straight;
s4 one-time drilling: after the pile position is rechecked, a rotary drilling rig is adopted to drill for one time, and the drilling is stopped when slight hole collapse occurs;
s5 installing a protective casing (1): putting the protective casing (1) down to the strong weathering layer;
s6 secondary drilling: and after the protective casing (1) is placed, secondary drilling is carried out until the pile length is designed.
2. The water-rich sandy gravel geological pile hole-forming construction method as claimed in claim 1, wherein: the top elevation of the protection casing (1) is higher than the positioning casing (2), and the length L of the protection casing (1) is equal to the depth of a rock entering section, the depth of a sand and gravel section and the top elevation of the protection casing (1).
3. The water-rich sandy gravel geological pile hole-forming construction method as claimed in claim 2, characterized in that: the depth of the rock entering section is not less than 500mm, and the height of the top of the protective casing (1) is not less than 600 mm.
4. The water-rich sandy gravel geological piled pile hole forming construction method as claimed in claim 1, 2 or 3, wherein: and (4) drilling until the designed pile length is reached, then cleaning the hole, then hoisting a reinforcement cage, and performing post pile-forming construction.
5. The water-rich sandy gravel geological pile hole-forming construction method as claimed in claim 4, wherein: the lower part of the steel reinforcement cage is covered by steel wire meshes in a wrapping mode, and the covering length of the steel wire meshes is from the hole bottoms of the pile holes to the protective cylinder (1) until the protective cylinder (1) is covered by 2m beyond the lower opening of the protective cylinder (1).
6. The water-rich sandy gravel geological pile hole-forming construction method as claimed in claim 1, wherein: in the step S3, the elevation of the top of the positioning pile casing (2) is not less than 300mm higher than the ground, the allowable deviation between the vertical line of the center of the positioning pile casing (2) and the plane of the center line of the pile hole is not more than 50mm, and the inclination of the vertical line is not more than 1%.
7. The water-rich sandy gravel geological pile hole-forming construction method as claimed in claim 1 or 6, wherein: in the step S4, the deviation between the center of a drill rod of the drilling machine and the center of the positioning protective cylinder (2) is not more than 5cm, and the deviation between the center of a drill bit and the center of the positioning protective cylinder (2) is not more than 2 cm;
the slight hole collapse indicates that the drilling speed is increased, the footage is reduced, and the soil output is increased.
8. The water-rich sandy gravel geological pile hole-forming construction method as claimed in claim 7, wherein: before setting out and positioning the piles, the field needs to be leveled, sundries are removed, soft soil is removed, and leveling and compaction are carried out, so that the elevation of the field is basically consistent with the calibration of the basic raft.
9. The water-rich sandy gravel geological pile hole-forming construction method as claimed in claim 4, wherein the post pile-forming construction is carried out according to the following steps: and underwater concrete is poured, and the protective casing (1) is pulled out immediately after the pouring is finished.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210421142.XA CN114753354A (en) | 2022-04-20 | 2022-04-20 | Water-rich sandy gravel geological pile forming construction method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210421142.XA CN114753354A (en) | 2022-04-20 | 2022-04-20 | Water-rich sandy gravel geological pile forming construction method |
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| CN114753354A true CN114753354A (en) | 2022-07-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114753352A (en) * | 2022-04-25 | 2022-07-15 | 中建八局第三建设有限公司 | Water-rich sandy gravel geological pile forming construction method |
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