CN112459050A - Hard cutting pile-forming construction method for secant pile in high-water-level complex geological area - Google Patents
Hard cutting pile-forming construction method for secant pile in high-water-level complex geological area Download PDFInfo
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- 238000010276 construction Methods 0.000 title claims abstract description 68
- 238000005520 cutting process Methods 0.000 title claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 21
- 238000005553 drilling Methods 0.000 claims abstract description 80
- 239000004567 concrete Substances 0.000 claims abstract description 69
- 239000011150 reinforced concrete Substances 0.000 claims abstract description 44
- 238000000034 method Methods 0.000 claims abstract description 16
- 230000002787 reinforcement Effects 0.000 claims description 47
- 239000002893 slag Substances 0.000 claims description 12
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 230000001681 protective effect Effects 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 238000004804 winding Methods 0.000 claims description 5
- 238000003466 welding Methods 0.000 claims description 4
- 238000009966 trimming Methods 0.000 claims description 3
- 239000011435 rock Substances 0.000 description 4
- 239000002689 soil Substances 0.000 description 4
- 235000019738 Limestone Nutrition 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000005755 formation reaction Methods 0.000 description 2
- 239000006028 limestone Substances 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
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- 230000009286 beneficial effect Effects 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
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- 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
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
- E02D19/18—Restraining of underground water by damming or interrupting the passage of underground water by making use of sealing aprons, e.g. diaphragms made from bituminous or clay material
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- 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
- E21B3/00—Rotary drilling
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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
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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
- E21B7/28—Enlarging drilled holes, e.g. by counterboring
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Abstract
The invention discloses a high-water-level complex geological area secant pile hard cutting pile-forming construction method, comprising the steps of S1, pile position numbering; s2, constructing plain concrete piles, and constructing and separating more than three piles; s3, after the No. 1 and No. 3 plain concrete piles reach 70% of the design strength, constructing a No. 2 reinforced concrete pile, and separating more than three piles; in steps S2 and S3, the drill rod of the rotary drilling rig is cylindrical, a plurality of vertical ribs which are uniformly distributed circumferentially are arranged on the outer wall of the drill rod, and all the ribs penetrate through to the lower end of the outer wall of the drill rod; after the drilling hole is drilled in place, reversing and withdrawing; after pouring forming, the plain concrete pile and the hole wall, the reinforced concrete pile and the hole wall, and the plain concrete pile and the reinforced concrete pile are respectively in zigzag spiral meshing. The high-water-level complex geological area is specially used for solving the technical problem that holes cannot be formed due to high-water-level complex geology, and the method is efficient, quick, safe and reliable, and the construction quality is guaranteed.
Description
Technical Field
The invention belongs to the technical field of constructional engineering, and particularly relates to a construction method of an occlusive pile.
Background
With the vigorous development of economic construction in China, traffic infrastructures such as railways and highways are rapidly developed, the construction level and the standard are continuously improved, and some lines inevitably pass through a section with higher underground water level.
The existing construction method of the secant pile can not meet the requirements of special geological environments in high-water-level complex geological regions, the construction efficiency is low, the construction quality and the construction safety of the secant pile can not be guaranteed, and even pore-forming can not be realized.
Disclosure of Invention
The invention aims to provide a secant pile hard cutting pile-forming construction method special for a high-water-level complex geological area, which aims to solve the technical problem that holes cannot be formed due to high-water-level complex geology, is efficient, quick, safe and reliable, and ensures the construction quality.
Therefore, the technical scheme adopted by the invention is as follows: a high water level complex geological area secant pile hard cutting pile-forming construction method comprises the following steps:
s1, numbering the pile positions in sequence according to the sequence of 1, 2, 3, 4, 5 and 6 … …; the odd number is a plain concrete pile position, and the even number is a reinforced concrete pile position;
s2, constructing a plain concrete pile, drilling a hole by adopting a rotary drilling rig, and then pouring concrete to form the plain concrete pile; the construction of the plain concrete pile is divided into more than three piles, namely the construction of the plain concrete pile is carried out according to the sequence of 1, n, 3 and n +2 … …, wherein n is singular number which is more than or equal to 5;
s3, after the plain concrete piles No. 1 and No. 3 on the two sides of the reinforced concrete pile position No. 2 reach 70% of the design strength, cutting the plain concrete piles No. 1 and No. 3 into holes by using a rotary drilling rig according to the design requirement, then placing a reinforcement cage at the reinforced concrete pile position No. 2, pouring concrete to form a reinforced concrete pile No. 2, and forming an interlocking pile by using the reinforced concrete pile No. 2 and the plain concrete piles No. 1 and No. 3 on the two sides; the construction of the reinforced concrete pile separates more than three piles, namely the construction of the reinforced concrete pile is carried out according to the sequence of 2, n +1, 4 and n +3 … …;
in steps S2 and S3, the drill rod of the rotary drilling rig is cylindrical, a plurality of block-shaped protrusions are uniformly distributed on the lower end of the outer wall of the drill rod, each block-shaped protrusion comprises an upper part and a lower part which are integrated into a whole, the upper part is an isosceles trapezoid with a wide upper part and a narrow lower part, two corners of the upper end of the isosceles trapezoid are both rounded off, the lower part is an isosceles triangle with a pointed end facing downwards to form a cutting edge, the upper end of the isosceles triangle is as wide as the lower end of the isosceles trapezoid, a trimming edge is arranged at the junction position of the isosceles trapezoid and the isosceles triangle, and the block-shaped protrusions form spiral winding teeth from top to bottom on the side wall of the pile hole due to the; after the drilling hole is drilled in place, the drilling rod is reversely withdrawn so as to ensure that the spiral winding teeth are not damaged when the drilling rod is withdrawn from the pile hole;
after pouring forming, the plain concrete pile and the hole wall, the reinforced concrete pile and the hole wall, and the plain concrete pile and the reinforced concrete pile are respectively in zigzag spiral meshing.
Preferably, in step S2, the plain concrete pile is constructed in the order of 1, 5, 3, and 7 … …; in step S3, the reinforced concrete pile is constructed in the order of 2, 6, 4, and 8 … ….
More preferably, step S2 is performed by the following steps:
s2-1, pile position setting out: accurately positioning the position of a pile hole by using a total station, and pulling a cross wire to nail and place four control piles at each pile positioning point;
s2-2, mounting a protective sleeve: the drilling machine enlarges the pile hole by using the reamer, controls the embedding position of the pile casing by taking four control piles as a reference, and presses the pile casing into the designed elevation through the high-torque drill rod; before and after the pile casing is pressed in, the vertical position of the pile casing is adjusted through an accurate level instrument leaning against the pile casing, and the top of the pile casing is 0.2-0.4 m higher than the original ground so as to facilitate the positioning of a drill rod and the protection of a pile hole;
s2-3, positioning a drilling machine: after the drill rod is ensured to be basically vertical through manual rough leveling, the drill rod is adjusted to be kept in a vertical state through an automatic control system;
s2-4, drilling to form a hole: the self weight and pressurization of the drilling bucket are used as drilling power, when the drilling bucket is extruded to be full of drilling slag, the drilling bucket is lifted out of the ground surface to discharge the slag, and the perpendicularity of the formed hole is repeatedly checked through a three-way vertical control system of the drilling machine in the construction process, so that the quality of the formed hole is ensured;
s2-5, pouring concrete.
More preferably, step S3 is performed by the following steps:
s3-1, pile position setting out: accurately positioning the position of a pile hole by using a total station, and pulling a cross wire to nail and place four control piles at each pile positioning point;
s3-2, mounting a protective sleeve: the drilling machine enlarges the pile hole by using the reamer, controls the embedding position of the pile casing by taking four control piles as a reference, and presses the pile casing into the designed elevation through the high-torque drill rod; before and after the pile casing is pressed in, the vertical position of the pile casing is adjusted through an accurate level instrument leaning against the pile casing, and the top of the pile casing is 0.2-0.4 m higher than the original ground so as to facilitate the positioning of a drill rod and the protection of a pile hole;
s3-3, positioning a drilling machine: after the drill rod is ensured to be basically vertical through manual rough leveling, the drill rod is adjusted to be kept in a vertical state through an automatic control system;
s3-4, drilling to form a hole: the self weight and pressurization of the drilling bucket are used as drilling power, when the drilling bucket is extruded to be full of drilling slag, the drilling bucket is lifted out of the ground surface to discharge the slag, and the perpendicularity of the formed hole is repeatedly checked through a three-way vertical control system of the drilling machine in the construction process, so that the quality of the formed hole is ensured;
s3-5, lowering a reinforcement cage;
s3-6, pouring concrete.
Preferably, in the step S3-5, the reinforcement cage includes a spiral reinforcement and a plurality of main reinforcements, all the main reinforcements are arranged in a circumferential vertical interval and are welded into a cylindrical reinforcement cage in combination with the spiral reinforcement, the diameters of the main reinforcements and the spiral reinforcement are 20-30 mm, and the spiral reinforcement and the main reinforcement are welded by arc spot welding; the reinforcement cage is divided into an upper section and a lower section, the upper main reinforcement and the lower main reinforcement are lengthened by adopting sleeves and are combined with the reinforcement stirrup to be welded in a double-sided lap joint manner; when the steel reinforcement cage is lowered, a 25T truck crane is used for carrying out three-point hoisting on the main hook and the auxiliary hook, manually supporting the cage into the hole and slowly lowering the cage into the hole.
The invention has the beneficial effects that:
(1) when the cutting occlusion is finished by a common super-retarding concrete occlusive pile process, the phenomenon of concrete piping of adjacent holes is easily generated; the construction method allows the strength of the plain concrete pile to be normally developed, does not need to rely on a retarder to control the strength of the concrete, avoids the phenomenon of concrete piping of adjacent holes, and simultaneously does not have the defect that the interlocking construction of the reinforced concrete pile cannot be carried out due to the fact that the pile forming time of a single pile is too long and the strength of the plain concrete pile is too high;
(2) the rotary drilling rig is adopted for drilling and hard cutting of plain concrete, the rotary drilling rig has strong adaptability to the boulder and the weathered rock stratum and is less influenced by geological factors, and when encountering the boulder and the weathered rock stratum, the hard cutting process can directly remove the underground rock stratum and the boulder in the pile forming process so as to form a pile at one time;
(3) construction of plain concrete piles and reinforced concrete piles is divided into more than three piles, so that the phenomenon that pile holes collapse due to the fact that the spacing distance between adjacent pile holes is too small when the pile holes are formed in a high-water-level complex geological area can be avoided; meanwhile, in the mode of constructing the pile holes by lattice jumping, after the plain concrete piles on the two sides of any reinforced concrete pile reach 70% of the designed strength, the construction of the corresponding reinforced concrete pile can be carried out, the construction is not influenced mutually, and the construction efficiency is high;
(4) the drilling rod is improved by adopting the conventional rotary drilling rig to form the outer wall of the pile hole with the spirally wound teeth from top to bottom, and the drilling rod is combined to rotate positively and negatively to ensure that the spiral line of the hole pattern is not damaged, so that the plain concrete pile is better meshed with the hole wall, the reinforced concrete pile and the hole wall, and the plain concrete pile and the reinforced concrete pile after pouring forming, the pile foundation quality is remarkable, and the construction quality and the construction safety are ensured.
In conclusion, the construction method does not need to rely on retarder to control the concrete strength in the construction process, the pile forming quality is more controllable, the difficult problem of pile forming of the secant pile is solved, the method has the characteristics of simple and easy operation of equipment, strong adaptability to boulders and weathered rock strata and the like, can be popularized and applied in similar underground enclosure engineering, and has a promoting significance for the development of the construction technology of the coastal city enclosure infrastructure. The method is particularly suitable for construction of deep foundation pit retaining structures of weathered limestone formations, sand gravel layers and soft soil foundations in high water level areas, can embody superiority of the deep foundation pit retaining structures particularly in saturated water-rich soft soil layers, and has wide popularization and application prospects.
Drawings
Fig. 1 shows a state after completion of the construction of the interlocking pile.
FIG. 2 is a schematic cross-sectional view of a drill rod of the rotary drilling rig.
Detailed Description
The invention will be further illustrated by the following examples in conjunction with the accompanying drawings:
a high water level complex geological area secant pile hard cutting pile-forming construction method comprises the following steps:
s1, numbering the pile positions in sequence according to the sequence of 1, 2, 3, 4, 5 and 6 … …; the odd number is a plain concrete pile position, and the even number is a reinforced concrete pile position; as shown in fig. 1, 3, 5, 7 and 9 are plain concrete piles (collectively called I piles); 2. and 4, 6 and 8 are reinforced concrete piles (collectively called II piles). Compared with a plain concrete pile, the reinforced concrete pile needs to be cast with a reinforcement cage and then poured with concrete.
S2, constructing a plain concrete pile, drilling a hole by adopting a rotary drilling rig, and then pouring concrete to form the plain concrete pile; the construction of the plain concrete pile is divided into more than three piles, namely the construction of the plain concrete pile is carried out according to the sequence of 1, n, 3 and n +2 … …, wherein n is more than or equal to 5. Such as: the plain concrete piles are constructed in the order of 1, 5, 3, 7 … ….
During the specific construction, the step S2 is carried out according to the following steps:
s2-1, pile position setting out: and accurately positioning the position of the pile hole by using a total station, and pulling a cross wire nail at each pile positioning point to put four control piles.
S2-2, mounting a protective sleeve: the drilling machine enlarges the pile hole by using the reamer, controls the embedding position of the pile casing by taking four control piles as a reference, and presses the pile casing into the designed elevation through the high-torque drill rod; before and after the pile casing is pressed in, the vertical position of the pile casing is adjusted through an accurate level instrument leaning against the pile casing, and the top of the pile casing is 0.2-0.4 m, preferably 0.3m, higher than the original ground so as to facilitate the positioning of a drill rod and the protection of a pile hole.
S2-3, positioning a drilling machine: after the drill rod is ensured to be basically vertical through manual rough leveling, the drill rod is adjusted to be kept in a vertical state through an automatic control system.
S2-4, drilling to form a hole: the drilling bucket is lifted out of the ground surface to discharge the drilling slag after being extruded to be full of the drilling slag, and the perpendicularity of the formed hole is repeatedly checked through a three-way vertical control system of the drilling machine in the construction process, so that the quality of the formed hole is ensured.
S2-5, pouring concrete.
S3, after the plain concrete piles No. 1 and No. 3 on the two sides of the reinforced concrete pile position No. 2 reach 70% of the design strength, cutting the plain concrete piles No. 1 and No. 3 into holes by using a rotary drilling rig according to the design requirement, then placing a reinforcement cage at the reinforced concrete pile position No. 2, pouring concrete to form a reinforced concrete pile No. 2, and forming an interlocking pile by using the reinforced concrete pile No. 2 and the plain concrete piles No. 1 and No. 3 on the two sides; the construction of the reinforced concrete pile separates more than three piles, namely the construction of the reinforced concrete pile is carried out according to the sequence of 2, n +1, 4 and n +3 … …. Such as: the reinforced concrete piles are constructed in the order of 2, 6, 4 and 8 … ….
During concrete construction, as long as the plain concrete piles No. 1 and No. 3 reach 70% of the design strength, the reinforced concrete pile No. 2 can be constructed, the following plain concrete piles are still constructed synchronously, and after the plain concrete piles on two sides of any reinforced concrete pile reach 70% of the design strength, the construction of the corresponding reinforced concrete pile can be carried out, so that the construction efficiency is high, and the construction is not influenced mutually.
Step S3 is performed by the following steps:
s3-1, pile position setting out: accurately positioning the position of a pile hole by using a total station, and pulling a cross wire to nail and place four control piles at each pile positioning point;
s3-2, mounting a protective sleeve: the drilling machine enlarges the pile hole by using the reamer, controls the embedding position of the pile casing by taking four control piles as a reference, and presses the pile casing into the designed elevation through the high-torque drill rod; before and after the pile casing is pressed in, the vertical position of the pile casing is adjusted through an accurate level instrument leaning against the pile casing, and the top of the pile casing is 0.2-0.4 m higher than the original ground so as to facilitate the positioning of a drill rod and the protection of a pile hole;
s3-3, positioning a drilling machine: after the drill rod is ensured to be basically vertical through manual rough leveling, the drill rod is adjusted to be kept in a vertical state through an automatic control system;
s3-4, drilling to form a hole: the self weight and pressurization of the drilling bucket are used as drilling power, when the drilling bucket is extruded to be full of drilling slag, the drilling bucket is lifted out of the ground surface to discharge the slag, and the perpendicularity of the formed hole is repeatedly checked through a three-way vertical control system of the drilling machine in the construction process, so that the quality of the formed hole is ensured;
s3-5, lowering a reinforcement cage;
s3-6, pouring concrete.
In steps S2 and S3, a drill rod a of the rotary drilling rig is cylindrical (as shown in fig. 2), a plurality of block-shaped protrusions are uniformly distributed on the lower end of the outer wall of the drill rod, each block-shaped protrusion comprises two parts which are integrated into a whole, the upper part of each block-shaped protrusion is an isosceles trapezoid b with a wide upper part and a narrow lower part, two corners of the upper end of each isosceles trapezoid b are rounded off at corners d, the lower part of each block-shaped protrusion is an isosceles triangle c, a tip end of each block-shaped protrusion faces downwards to form a cutting edge e, the upper end of each isosceles triangle c is equal to the lower end of each isosceles trapezoid b, a trimming cutting edge f is arranged at the junction position of the isosceles trapezoid b and the isosceles triangle c, and as the drill rod rotates; and after the drilling hole is drilled in place, the drill rod is reversely withdrawn so as to ensure that the spiral winding teeth are not damaged when the drill rod is withdrawn from the pile hole.
When the drill rod is transformed, a plurality of block-shaped bulges which are uniformly distributed on the circumference can be welded on the outer wall of the existing drill rod, and the block-shaped bulges can also be integrally formed by a cylinder of the drill rod. The number of the block-shaped bulges is set according to the requirement, and the interval between the adjacent block-shaped bulges is preferably not less than the maximum width of the block-shaped bulges.
As shown in fig. 1, after the casting, the plain concrete pile and the hole wall, the reinforced concrete pile and the hole wall, and the plain concrete pile and the reinforced concrete pile are respectively spirally engaged in a zigzag manner.
In step S3-5, the reinforcement cage is mainly composed of a spiral reinforcement and a plurality of main reinforcements. All the main reinforcements are arranged at intervals in the circumferential vertical direction and are welded into a cylindrical reinforcement cage main framework by combining with the spiral reinforcements. The diameters of the main ribs and the spiral ribs are 20-30 mm, and the spiral ribs and the main ribs are welded through arc spot welding. Because the depth of the pile hole is deeper to more than 17 meters and the length of a single steel bar is insufficient, the steel bar cage is divided into an upper section and a lower section, the upper main bar and the lower main bar are lengthened by adopting sleeves and are welded by combining with the reinforcing stirrup in a double-sided lap joint manner; namely, the sleeve is sleeved outside the connecting end of the upper main reinforcement and the lower main reinforcement, and then the double-sided lap welding of the reinforcement stirrup is combined to ensure the strength of the joint position. When the steel reinforcement cage is lowered, a 25T truck crane is used for carrying out three-point hoisting on the main hook and the auxiliary hook, manually supporting the cage into the hole and slowly lowering the cage into the hole.
When concrete is poured, a 25t truck crane and a guide pipe system are adopted in a pouring mode, the guide pipe is made of seamless steel pipes with the diameter of 30cm, a quick threaded joint is adopted, and 2 sealing rings are arranged at the joint of the guide pipe, so that the sealing performance of the joint is guaranteed.
And after the construction is finished, pile foundation detection is carried out. The quality detection of the piles adopts a low-strain dynamic measurement method to detect the integrity of the pile body, and the number of the detected piles is not less than 20 percent of the total number of the piles and is not less than 5.
And (3) economic benefit analysis: the construction method adopts a secant pile hard cutting construction process, the construction cost is about 410 yuan/m, and the total construction cost is 109.6 ten thousand yuan. Compared with the traditional hydraulic full casing construction process, the cost is saved by 189.9 ten thousand. The cost is saved by 710 yuan per linear meter equivalent to the pile foundation with the diameter of 90cm, the economic effect is obvious, and the specific economic benefit comparison is shown in the following table.
Through engineering practice, the construction efficiency of the secant pile can reach 6-8 piles per day by adopting a secant pile hard cutting construction process, and the construction period is saved by more than half compared with that of the traditional hydraulic full-casing construction process. The construction method is suitable for construction of deep foundation pit retaining structures of high-water-level weathered limestone formations, sand gravel layers and soft soil foundations, and can embody superiority of the deep foundation pit retaining structures particularly in saturated water-rich soft soil layers.
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Claims (5)
1. A high-water-level complex geological area secant pile hard cutting pile-forming construction method is characterized by comprising the following steps of:
s1, numbering the pile positions in sequence according to the sequence of 1, 2, 3, 4, 5 and 6 … …; the odd number is a plain concrete pile position, and the even number is a reinforced concrete pile position;
s2, constructing a plain concrete pile, drilling a hole by adopting a rotary drilling rig, and then pouring concrete to form the plain concrete pile; the construction of the plain concrete pile is divided into more than three piles, namely the construction of the plain concrete pile is carried out according to the sequence of 1, n, 3 and n +2 … …, wherein n is singular number which is more than or equal to 5;
s3, after the plain concrete piles No. 1 and No. 3 on the two sides of the reinforced concrete pile position No. 2 reach 70% of the design strength, cutting the plain concrete piles No. 1 and No. 3 into holes by using a rotary drilling rig according to the design requirement, then placing a reinforcement cage at the reinforced concrete pile position No. 2, pouring concrete to form a reinforced concrete pile No. 2, and forming an interlocking pile by using the reinforced concrete pile No. 2 and the plain concrete piles No. 1 and No. 3 on the two sides; the construction of the reinforced concrete pile separates more than three piles, namely the construction of the reinforced concrete pile is carried out according to the sequence of 2, n +1, 4 and n +3 … …;
in steps S2 and S3, the drill rod of the rotary drilling rig is cylindrical (a), a plurality of block-shaped protrusions are uniformly distributed on the lower end of the outer wall of the drill rod, each block-shaped protrusion comprises an upper part and a lower part which are integrated, the upper part is an isosceles trapezoid (b) with a wide upper part and a narrow lower part, two corners at the upper end of the isosceles trapezoid (b) are both rounded corners (d), the lower part is an isosceles triangle (c) with a pointed end facing downwards to form a cutting edge (e), the upper end of the isosceles triangle (c) is as wide as the lower end of the isosceles trapezoid (b), a trimming edge (f) is arranged at the junction position of the isosceles trapezoid (b) and the isosceles triangle (c), and as the drill rod drills downwards in a rotating manner, the block-shaped protrusions form spiral winding teeth from top to bottom on the side wall; after the drilling hole is drilled in place, the drilling rod is reversely withdrawn so as to ensure that the spiral winding teeth are not damaged when the drilling rod is withdrawn from the pile hole;
after pouring forming, the plain concrete pile and the hole wall, the reinforced concrete pile and the hole wall, and the plain concrete pile and the reinforced concrete pile are respectively in zigzag spiral meshing.
2. The high water level complex geological area secant pile hard cutting pile-forming construction method according to claim 1, characterized in that: in step S2, the plain concrete pile is constructed in the order of 1, 5, 3, 7 … …; in step S3, the reinforced concrete pile is constructed in the order of 2, 6, 4, and 8 … ….
3. The hard cutting pile-forming construction method for the secant pile in the high water level complex geological area as claimed in claim 1, wherein the step S2 is carried out according to the following steps:
s2-1, pile position setting out: accurately positioning the position of a pile hole by using a total station, and pulling a cross wire to nail and place four control piles at each pile positioning point;
s2-2, mounting a protective sleeve: the drilling machine enlarges the pile hole by using the reamer, controls the embedding position of the pile casing by taking four control piles as a reference, and presses the pile casing into the designed elevation through the high-torque drill rod; before and after the pile casing is pressed in, the vertical position of the pile casing is adjusted through an accurate level instrument leaning against the pile casing, and the top of the pile casing is 0.2-0.4 m higher than the original ground so as to facilitate the positioning of a drill rod and the protection of a pile hole;
s2-3, positioning a drilling machine: after the drill rod is ensured to be basically vertical through manual rough leveling, the drill rod is adjusted to be kept in a vertical state through an automatic control system;
s2-4, drilling to form a hole: the self weight and pressurization of the drilling bucket are used as drilling power, when the drilling bucket is extruded to be full of drilling slag, the drilling bucket is lifted out of the ground surface to discharge the slag, and the perpendicularity of the formed hole is repeatedly checked through a three-way vertical control system of the drilling machine in the construction process, so that the quality of the formed hole is ensured;
s2-5, pouring concrete.
4. The hard cutting pile-forming construction method for the secant pile in the high water level complex geological area as claimed in claim 1, wherein the step S3 is carried out according to the following steps:
s3-1, pile position setting out: accurately positioning the position of a pile hole by using a total station, and pulling a cross wire to nail and place four control piles at each pile positioning point;
s3-2, mounting a protective sleeve: the drilling machine enlarges the pile hole by using the reamer, controls the embedding position of the pile casing by taking four control piles as a reference, and presses the pile casing into the designed elevation through the high-torque drill rod; before and after the pile casing is pressed in, the vertical position of the pile casing is adjusted through an accurate level instrument leaning against the pile casing, and the top of the pile casing is 0.2-0.4 m higher than the original ground so as to facilitate the positioning of a drill rod and the protection of a pile hole;
s3-3, positioning a drilling machine: after the drill rod is ensured to be basically vertical through manual rough leveling, the drill rod is adjusted to be kept in a vertical state through an automatic control system;
s3-4, drilling to form a hole: the self weight and pressurization of the drilling bucket are used as drilling power, when the drilling bucket is extruded to be full of drilling slag, the drilling bucket is lifted out of the ground surface to discharge the slag, and the perpendicularity of the formed hole is repeatedly checked through a three-way vertical control system of the drilling machine in the construction process, so that the quality of the formed hole is ensured;
s3-5, lowering a reinforcement cage;
s3-6, pouring concrete.
5. The high water level complex geological area secant pile hard cutting pile-forming construction method is characterized by comprising the following steps of: in the step S3-5, the reinforcement cage comprises spiral reinforcements and a plurality of main reinforcements, all the main reinforcements are arranged in a circumferential vertical interval manner and are welded into a cylindrical reinforcement cage in combination with the spiral reinforcements, the diameters of the main reinforcements and the spiral reinforcements are 20-30 mm, and the spiral reinforcements and the main reinforcements are welded by arc spot welding; the reinforcement cage is divided into an upper section and a lower section, the upper main reinforcement and the lower main reinforcement are lengthened by adopting sleeves and are combined with the reinforcement stirrup to be welded in a double-sided lap joint manner; when the steel reinforcement cage is lowered, a 25T truck crane is used for carrying out three-point hoisting on the main hook and the auxiliary hook, manually supporting the cage into the hole and slowly lowering the cage into the hole.
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