CN113047329A - Plum-blossom-shaped pile foundation anchor rod composite foundation structure and construction method thereof - Google Patents
Plum-blossom-shaped pile foundation anchor rod composite foundation structure and construction method thereof Download PDFInfo
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- CN113047329A CN113047329A CN202110535998.5A CN202110535998A CN113047329A CN 113047329 A CN113047329 A CN 113047329A CN 202110535998 A CN202110535998 A CN 202110535998A CN 113047329 A CN113047329 A CN 113047329A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
- E02D27/12—Pile foundations
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
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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
- E02D5/54—Piles with prefabricated supports or anchoring parts; Anchoring piles
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
Abstract
The invention relates to a plum blossom-shaped pile foundation anchor rod composite foundation structure and a construction method thereof, wherein the plum blossom-shaped pile foundation anchor rod composite foundation structure comprises a pile foundation with a plum blossom-shaped structure, the pile foundation comprises a cylindrical pile body and a plurality of petal bodies which are circumferentially distributed outside the pile body, wherein petal body inner main ribs are arranged in the petal bodies, and the petal inner main ribs are positioned at the centers of the petal bodies to ensure the uplift effect of the concrete of the petal bodies; the utility model discloses a pile anchor bolt, including stake internal portion, the anchor bolt is provided with the anchor bolt, the pile body is inside to be provided with the steel reinforcement cage, the steel reinforcement cage includes main muscle in the stake, sets up main muscle inside in the stake and sets up the outside stirrup of main muscle in the stake, the outside of steel reinforcement cage is provided with the backplate, main muscle includes logical long main muscle and the conventional main muscle of random staggered distribution in the stake, lead to long main muscle to go deep into inside the anchor eye, use in the lump as the anchor eye reinforcing bar, conventional main muscle is isometric with the stake body, set up anchor bolt main muscle in the anchor eye, the outside of anchor bolt.
Description
Technical Field
The invention relates to a plum blossom-shaped pile foundation anchor rod composite foundation structure and a construction method thereof, which are applied to the technical field of power transmission lines.
Background
With continuous rising of labor cost and continuous improvement of construction safety risk, mechanized construction of power transmission lines has become a necessary trend, but the power transmission lines have point-like linear distribution, each construction site is in a dispersion shape, the construction sites are often in mountains and mountains, and how to enter equipment, how to miniaturize construction equipment becomes an important factor for solving the problem of mechanized construction of the power transmission lines (original miniaturized equipment cannot meet the requirement of conventional foundations on power), and because the equipment is difficult to enter the field, the basic mechanized construction of the power transmission lines is always a short plate for line construction.
Because the bearing capacity of the upper part is lower and the bearing capacity of the lower part is higher under the condition of mountainous rock and soil, the main factor influencing the power of the equipment is to excavate the lower rock and soil mass, most of the existing conventional undisturbed soil foundation of the power transmission line belongs to the equal diameter (such as an equal diameter hole digging foundation and a cast-in-place pile foundation), or the upper part has small size and the lower part has large size (such as a hole digging foundation, a bottom-expanded hole digging foundation and a conical embedded foundation), and according to the mechanical drilling efficiency, the excavation progress of the lower rock and soil mass is slower or the lower rock and soil mass cannot be excavated smoothly under the.
The invention patent with publication number CN2009200943217 discloses an excavation and rock-added anchor rod composite environment-friendly foundation, if a jumbolter is adopted for construction, aiming at a rock-soil body excavated at the upper part, the hole forming quality of an anchor hole at the lower part is poor, and the construction requirement cannot be met, so that manual drilling is required to be carried out in the later period; if the conventional drilling equipment is adopted to carry out drilling (such as a rotary drilling rig) at present, the equipment is large in size, wide in road repairing width, seriously damaged mountain vegetation and poor in environmental benefit.
Disclosure of Invention
In order to solve the technical problems, the invention provides a plum blossom-shaped pile foundation anchor rod composite foundation structure and a construction method thereof, which can better avoid hole inclination and have high hole forming quality; the small-sized equipment is adopted for construction, large-area excavation of an approach road during approach of the equipment is avoided, and the design requirement of large acting force of the power transmission line is met.
The technical scheme of the invention is as follows:
a plum blossom-shaped pile foundation anchor rod composite foundation structure comprises a pile foundation with a plum blossom-shaped structure, wherein the pile foundation comprises a cylindrical pile body and a plurality of petal bodies which are circumferentially distributed outside the pile body, wherein petal-shaped inner main ribs are arranged in the petal bodies, and the petal-shaped inner main ribs are positioned at the centers of the petal bodies to ensure the uplift effect of partial concrete of the petal bodies; the utility model discloses a pile anchor bolt, including stake internal portion, the anchor bolt is provided with the anchor bolt, the pile body is inside to be provided with the steel reinforcement cage, the steel reinforcement cage includes main muscle in the stake, sets up main muscle inside in the stake and sets up the outside stirrup of main muscle in the stake, the outside of steel reinforcement cage is provided with the backplate, main muscle includes logical long main muscle and the conventional main muscle of random staggered distribution in the stake, lead to long main muscle to go deep into inside the anchor eye, use in the lump as the anchor eye reinforcing bar, conventional main muscle is isometric with the stake body, set up anchor bolt main muscle in the anchor eye, the outside of anchor bolt.
The length of the anchor rod main reinforcement penetrating into the pile foundation is more than or equal to 40 times of the diameter of the anchor rod main reinforcement.
The inclusion is made of concrete or fine aggregate concrete, and the grade of the concrete is higher than that of the concrete of the pile foundation by one grade.
The number of the guard plates is four, and the four guard plates are fixed outside the reinforcement cage in a cross structure.
A construction method of a plum blossom-shaped pile foundation anchor rod composite foundation structure comprises the following specific steps:
keeping the field flat and cleaning the base surface, removing 10cm of virtual soil from the original ground, introducing a miniature pile drilling machine and ensuring that the miniature pile drilling machine has enough operation platform and bearing capacity;
selecting a flat-head drill bit matched with the miniature pile drilling machine to match with a wet/dry dust removal method for dust removal and slag removal, forming holes by overlapping for many times according to the structures of the pile body and the petal body, and continuously washing the holes to prevent drill sticking in the construction process;
positioning an anchor hole of the anchor rod main rib through a micro pile drilling foundation, selecting the size of an anchor hole drill bit, and drilling downwards through a flat head drill bit to reach the depth of the anchor rod main rib;
checking the hole after drilling, cleaning the anchor hole in a dry dust removal mode, further sequentially completing drilling work of all the anchor holes on the ground, lifting the drill bit after drilling, and unloading the anchor hole drill bit;
installing a bearing plate on a suspender, clamping the suspender into a clamping groove of the bearing plate, connecting the suspender with the bearing plate through an annular plate bolt, binding a steel wire rope in a hoisting hole by checking the strength of the steel wire rope, and hoisting and lowering the steel pile casing;
removing the steel wire rope and the bearing plate, replacing the drill bit of the upper structure, and adopting a multi-time drilling mode to further realize that the miniature pile drilling machine drills into the pile foundation, wherein the drilling sequence is that the miniature pile drilling machine is pushed from the center to the outer ring gradually, an annular drilling mode is adopted, in the drilling process of each layer, a soil layer or a rock stratum between drilled holes needs to be cleaned, and in the drilling process, a steel casing of a main reinforcement of the anchor rod needs to be avoided, so that the stability of the anchor hole is ensured;
after drilling is finished, cleaning holes, unloading drill bits, connecting a steel wire rope of a re-plate-bound suspender with the steel casing, and pulling up the steel casing by using a drilling machine hoisting system;
the anchor rod main reinforcement is placed, the fine aggregate concrete inclusion is poured and vibrated fully, the pile inner main reinforcement, the inner stirrups and the outer stirrups are bound at the ground to form a reinforcement cage, the four guard plates are welded outside the reinforcement cage in a cross structure, the accurate positioning of the reinforcement cage during placement is guaranteed through the guard plates, the reinforcement cage is hoisted through miniature pile drilling equipment, and the reinforcement cage is placed after accurate positioning;
and (4) manually lowering the main reinforcement in the petals, pouring concrete on the upper part of the main reinforcement in the petals, and maintaining the foundation to complete the construction of the quincuncial pile foundation.
The invention has the following beneficial effects:
1. when the quincunx pile foundation anchor rod composite foundation is used, the quincunx pile foundation anchor rod composite foundation can be excavated to the designed depth (the upper part is large in size, and the lower part is small in size) under the same equipment power, large-area excavation of an approach road during approach of equipment (high mountains and large ridges) is avoided, and the requirements of equipment miniaturization and environmental protection are completely met.
2. Compared with the construction of a conventional anchor rod drilling machine, the construction method can better avoid hole inclination and has high hole forming quality; compared with the conventional drilling equipment, the construction method needs less equipment weight, narrow approach path and high environmental benefit; the equipment needs to use the functions of increasing the static pressure steel pile casing and the upper pulling steel pile casing by the power of the equipment, and avoids the adverse effects of hole collapse and the like of the formed anchor hole; the drill bit needs to be replaced once in the drilling process, high-efficiency excavation of an upper structure and a lower structure is met, the upper structure realizes a large-aperture design scheme in a small-aperture multi-drilling mode, and a novel quincunx pile foundation outline is formed by combining equipment.
3. The quincunx pile foundation structure provided by the invention is mainly used for meeting the requirement of miniaturization of mountain power transmission line equipment and realizing excavation of a foundation under the condition of small equipment power, the peripheral length of the quincunx pile foundation is increased greatly compared with the conventional circle center appearance size, for example, the perimeter of a circle center pile foundation with a pile diameter of 1.4m is 4.4m, the perimeter of the pile foundation with the quincunx structure can be increased to 6.2m, so that the contact area is increased by 1.4 times, and the side friction resistance is correspondingly increased by 1.4 times.
4. According to the construction method of the plum blossom-shaped pile foundation anchor rod composite foundation structure, the excavation of the foundation type can be completed by adopting a novel miniature pile drilling machine through the innovation of the plum blossom-shaped pile foundation structure and the innovation of mechanical equipment, the influence on the environment is small, the damage to vegetation is less, and the progress benefit and the safety benefit are improved.
5. The invention provides an in-petal main rib arranged in a petal body and an external guard plate of a reinforcement cage, aiming at transmitting foundation acting force transmitted by an upper structure, wherein the components play a vital role in the whole invention, and the plum blossom-shaped pile foundation and anchor rod composite foundation belongs to the type of composite foundation, and the structure of the composite foundation is completely different from that of a pure pile foundation.
Drawings
FIG. 1 is a schematic top view of a pile foundation according to the present invention;
FIG. 2 is a side sectional view of a pile foundation of the present invention;
the reference numbers in the figures denote:
1. pile foundations; 11. a pile body; 12. a flap body; 2. main reinforcement in the pile; 3. an inner stirrup; 4. an outer stirrup; 5. main ribs in the valve; 6. a guard plate; 7. an anchor eye; 8. an inclusion; 9. anchor rod owner muscle.
Detailed Description
The invention is described in detail below with reference to the figures and the specific embodiments.
Referring to fig. 1 to 2, the quincunx pile foundation and anchor rod composite foundation structure comprises a pile foundation 1 of a quincunx structure, wherein the pile foundation 1 is located in a surface soil layer or a rock stratum, the pile foundation 1 comprises a cylindrical pile body 11 and a plurality of petal bodies 12 which are circumferentially distributed outside the pile body 11, petal body 12 is internally provided with petal inner main ribs 5, and the petal inner main ribs 5 are located at the center of the petal bodies 12 to ensure the anti-pulling effect of partial concrete of the petal bodies 12; pile body 11 is inside to be provided with the steel reinforcement cage, and the steel reinforcement cage includes main muscle 2 in the stake, sets up in the stake 2 inside interior stirrup 3 and set up in the stake 2 outside outer stirrup 4 of main muscle, interior stirrup 3 satisfies the requirement of basic shear cross section, the outside of steel reinforcement cage is provided with backplate 6, main muscle 2 includes logical long main muscle and the conventional main muscle of random staggered distribution in the stake, logical long main muscle is deep into inside anchor eye 7, uses in the lump as the anchor eye reinforcing bar, conventional main muscle is isometric with pile body 11, set up anchor rod main muscle 9 in the anchor eye 7, the outside of anchor rod main muscle 9 is provided with inclusion 8.
The length of the anchor rod main reinforcement 9 penetrating into the pile foundation 1 is more than or equal to 40 times of the diameter of the anchor rod main reinforcement 9, and when the main reinforcement 2 in the pile collides with the anchor rod main reinforcement 9, the main reinforcement 2 in the pile penetrates into the inclusion 8 outside the anchor rod main reinforcement 9.
The inclusion 8 is made of concrete or fine aggregate concrete, and the grade of the concrete is higher than that of the concrete of the pile foundation 1 by one grade.
The number of the guard plates 6 is four, and the guard plates 6 are fixed outside the reinforcement cage in a cross structure.
A construction method of a plum blossom-shaped pile foundation anchor rod composite foundation structure comprises the following specific steps:
keeping the field flat and cleaning the base surface, removing 10cm of soil on the original ground, introducing a micro-pile drilling machine and ensuring that the micro-pile drilling machine has enough operation platform and bearing capacity, wherein the multifunctional micro-pile drilling machine introduced in the construction method preferably adopts a multifunctional micro-pile drilling machine with the model number of WZFT 100A;
a flat-head drill bit matched with the miniature pile drilling machine is selected to be matched with a wet/dry dust removal method for dust removal and slag removal, holes are formed in an overlapped mode for multiple times according to the structures of the pile body 11 and the flap body 12, and holes need to be washed repeatedly in the construction process in order to prevent drill clamping;
positioning the anchor hole 7 of the anchor rod main rib 9 through a miniature pile drilling foundation, selecting the size of an anchor hole drill bit (preferably 120-200mm), and drilling downwards through a flat head drill bit to reach the depth of the anchor rod main rib 9;
after drilling is finished, checking the hole, after the parameters of the hole depth and the hole inclination meet the design requirements, cleaning the anchor hole 7 in a dry dust removal mode, further sequentially completing drilling work of all the anchor holes 7 on the ground, lifting a drill bit after drilling is finished, and unloading the anchor hole drill bit;
installing a bearing plate on a suspender, clamping the suspender into a clamping groove of the bearing plate, connecting the suspender with the bearing plate through an annular plate bolt, binding a steel wire rope in a hoisting hole by checking the strength of the steel wire rope, hoisting a steel casing, wherein the diameter of the steel casing is 1-2mm smaller than that of an anchor hole 7, aligning a drill hole and lowering the steel casing, applying axial force to the steel casing if the steel casing is subjected to phenomena such as stone projection and the like in the process of lowering the steel casing, ensuring that the steel casing can smoothly reach the designed depth of the anchor hole 7, and ensuring that the top of the steel casing is 200mm above the ground and drilling sundries do not enter the anchor hole 7;
the steel wire rope and the bearing plate are detached, the drill bit of the upper structure (D is 300-400mm), a multi-time drilling mode is adopted, the micro pile drilling machine is further drilled into the pile foundation 1, the drilling sequence is that the micro pile drilling machine is gradually pushed from the center to the outer ring, an annular drilling mode is adopted, soil layers or rock layers among drilled holes need to be cleaned in the drilling process of each layer, the steel casing of the anchor rod main rib 9 needs to be avoided in the drilling process, and the stability of the anchor hole 7 is guaranteed;
after drilling is finished, cleaning holes, unloading drill bits, connecting a steel wire rope of a re-plate-bound suspender with the steel casing, and pulling up the steel casing by using a drilling machine hoisting system;
the anchor rod main reinforcement 9 is lowered, the fine aggregate concrete inclusion 8 is poured and vibrated fully, the pile inner main reinforcement 2, the inner hoop reinforcement 3 and the outer hoop reinforcement 4 are bound at the ground to form a reinforcement cage, the four guard plates 6 are welded outside the reinforcement cage in a cross structure, accurate positioning of the reinforcement cage during lowering is guaranteed through the guard plates 6, hoisting is carried out through miniature pile drilling equipment, and the reinforcement cage is lowered after accurate positioning;
and (3) manually lowering the main reinforcement 5 in the petals, pouring concrete on the upper part of the main reinforcement 5 in the petals, and performing foundation maintenance to complete the construction of the plum blossom-shaped pile foundation 1.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (5)
1. The utility model provides a plum blossom form pile foundation stock composite foundation structure which characterized in that: the pile foundation (1) comprises a quincunx structure, the pile foundation (1) comprises a cylindrical pile body (11) and a plurality of petal bodies (12) which are circumferentially distributed outside the pile body (11), petal inner main ribs (5) are arranged in the petal bodies (12), and the petal inner main ribs (5) are positioned in the centers of the petal bodies (12) to ensure the uplift resistance effect of partial concrete of the petal bodies (12); pile body (11) inside is provided with the steel reinforcement cage, and the steel reinforcement cage includes main muscle (2) in the stake, sets up inside interior stirrup (3) of main muscle (2) in the stake and sets up outside stirrup (4) of main muscle (2) outside in the stake, the outside of steel reinforcement cage is provided with backplate (6), main muscle (2) are including leading to long main muscle and conventional main muscle of random scattered distribution in the stake, lead to long main muscle to go deep into inside anchor eye (7), set up anchor rod main muscle (9) in anchor eye (7), the outside of anchor rod main muscle (9) is provided with inclusion (8).
2. The plum blossom-shaped pile foundation anchor rod composite foundation structure of claim 1, wherein: the length of the anchor rod main rib (9) penetrating into the pile foundation (1) is more than or equal to 40 times of the diameter of the anchor rod main rib (9).
3. The plum blossom-shaped pile foundation anchor rod composite foundation structure of claim 1, wherein: the inclusion (8) is made of concrete or fine aggregate concrete, and the concrete grade of the inclusion (8) is higher than that of the pile foundation (1) by one grade.
4. The plum blossom-shaped pile foundation anchor rod composite foundation structure of claim 1, wherein: the number of the guard plates (6) is four, and the four guard plates (6) are fixed outside the reinforcement cage in a cross structure.
5. The construction method of the quincuncial pile foundation and anchor rod composite foundation structure as claimed in claim 4, wherein the construction method comprises the following steps: the specific operation steps are as follows:
s1, keeping the field flat and cleaning the base surface, removing 10cm of soil on the original ground, introducing a micro-pile drilling machine and ensuring that the micro-pile drilling machine has enough operation platform and bearing capacity;
s2, selecting a flat-head drill bit matched with the mini-pile drilling machine to match with a wet/dry dust removal method for dust removal and slag discharge, and forming holes by overlapping for many times according to the structures of the pile body (11) and the flap body (12);
s3, positioning the anchor hole (7) of the anchor rod main rib (9) through the miniature drill pile foundation, selecting the size of an anchor hole drill bit, and drilling downwards through a flat-head drill bit to reach the depth of the anchor rod main rib (9);
s4, checking the hole after drilling, cleaning the anchor hole (7) in a dry dust removal mode, further completing the drilling work of all the anchor holes (7) on the ground in sequence, lifting the drill bit after drilling, and unloading the anchor hole drill bit;
s5: installing a bearing plate on a suspender, clamping the suspender into a clamping groove of the bearing plate, connecting the suspender with the bearing plate through an annular plate bolt, binding a steel wire rope in a hoisting hole by checking the strength of the steel wire rope, and hoisting and lowering the steel pile casing;
s6: the steel wire rope and the bearing plate are detached, the drill bit of the upper structure is replaced, a multi-time drilling mode is adopted, and then the micro pile drilling machine is drilled into the pile foundation (1), the drilling sequence is that the micro pile drilling machine is gradually pushed from the center to the outer ring, an annular drilling mode is adopted, in the drilling process of each layer, soil layers or rock layers among drilled holes need to be cleaned, in the drilling process, the steel casing of the anchor rod main rib (9) needs to be avoided, and the stability of the anchor hole (7) is ensured;
s7: after drilling is finished, cleaning holes, unloading drill bits, connecting a steel wire rope of a re-plate-bound suspender with the steel casing, and pulling up the steel casing by using a drilling machine hoisting system;
s8: the anchor rod main reinforcement (9) is lowered, the fine aggregate concrete inclusion (8) is poured and sufficiently vibrated, the pile inner main reinforcement (2), the inner hoop reinforcement (3) and the outer hoop reinforcement (4) are bound at the ground to form a reinforcement cage, the four guard plates (6) are welded outside the reinforcement cage in a cross structure, the accurate positioning of the reinforcement cage during lowering is guaranteed through the guard plates (6), the reinforcement cage is hoisted through miniature pile drilling equipment, and the reinforcement cage is lowered after accurate positioning;
s9: manually lowering the main reinforcement (5) in the petals, pouring concrete on the upper portion of the main reinforcement (5) in the petals, and performing foundation maintenance to complete construction of the plum-blossom-shaped pile foundation (1).
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| CN202110535998.5A CN113047329B (en) | 2021-05-17 | 2021-05-17 | Plum-blossom-shaped pile foundation anchor rod composite foundation structure and construction method thereof |
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| CN202110535998.5A CN113047329B (en) | 2021-05-17 | 2021-05-17 | Plum-blossom-shaped pile foundation anchor rod composite foundation structure and construction method thereof |
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| CN113047329B CN113047329B (en) | 2022-08-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115288119A (en) * | 2022-09-01 | 2022-11-04 | 绍兴大明电力设计院有限公司 | Prefabricated bearing platform type miniature pile-anchor rod composite foundation and construction method thereof |
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| JP2020105729A (en) * | 2018-12-26 | 2020-07-09 | 大和ハウス工業株式会社 | Reinforcement bar for anchor bar, anchor bar and precast concrete foundation |
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2021
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| JP2008223348A (en) * | 2007-03-13 | 2008-09-25 | Nishimatsu Constr Co Ltd | Earthquake resisting reinforcement structure of pile foundation |
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| CN113047329B (en) | 2022-08-23 |
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