CN113863358A - Northwest area wet-dry freeze-thaw coupling environment assembled transmission tower foundation structure - Google Patents
Northwest area wet-dry freeze-thaw coupling environment assembled transmission tower foundation structure Download PDFInfo
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- CN113863358A CN113863358A CN202111405111.7A CN202111405111A CN113863358A CN 113863358 A CN113863358 A CN 113863358A CN 202111405111 A CN202111405111 A CN 202111405111A CN 113863358 A CN113863358 A CN 113863358A
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Classifications
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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
- E02D27/32—Foundations for special purposes
- E02D27/42—Foundations for poles, masts or chimneys
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/02—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against ground humidity or ground water
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/06—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against corrosion by soil or water
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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
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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
- E02D5/223—Details of top sections of foundation piles
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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
- E02D5/24—Prefabricated piles
- E02D5/30—Prefabricated piles made of concrete or reinforced concrete or made of steel and concrete
Abstract
A northwest area wet-dry freeze-thaw coupling environment assembly type power transmission tower foundation structure belongs to the technical field of energy engineering and structural engineering. The pile cap unit is connected with the upper end of the pile body unit, and the lower end of the pile body unit is connected with the bearing platform. The method avoids the problems of poor concrete quality, low bearing capacity, low material corrosion resistance, high repair and reinforcement difficulty and the like caused by large-volume integral pouring of concrete in special soil environments such as saline soil, deep soft soil or large-area soft and weak subjacent layers at the lower part of a foundation; the construction is efficient and quick, and the input cost of materials and manpower is saved; in addition, once the foundation is damaged to a certain extent due to the influence of the irresistance, the damaged parts can be replaced by adopting a direct replacement method, so that the repairing and reinforcing quality and speed are greatly improved, and the problems of foundation construction quality, grounding resistance and repairing and reinforcing in the service period of the foundation in the field or under the special geological landform of the existing to-be-constructed power transmission engineering pile foundation are effectively solved.
Description
Technical Field
The invention relates to a northwest area wet-dry freeze-thaw coupling environment assembly type power transmission tower foundation structure, and belongs to the technical field of energy engineering and structural engineering.
Background
With the rapid development of electric power facilities in China, a large number of power transmission and transformation projects pass through northwest regions, so that the power transmission and transformation project foundation is influenced by complex environments such as saline soil, collapsible loess, soft and weak underlying layers, deep soft soil, complex temperature and rainfall conditions, damages such as foundation corrosion, frost heaving and thaw collapse, uneven settlement and cracks occur, meanwhile, the damage is influenced by environmental factors such as freeze-thaw cycle, sulfate corrosion and chloride ion corrosion, the durability and long-term service performance of the power transmission and transformation project foundation are seriously influenced, and the safety and stability of the power transmission and transformation projects are influenced. Furthermore, the electric transmission and transformation grounding project involves a very complicated construction process, wherein the safety and durability of the structure play a role in controlling the safe operation of the electric transmission and transformation. In power transmission and transformation engineering, a grounding grid is an important facility for ensuring safe and reliable operation of a power system and safety of personnel and equipment, and grounding resistance of the grounding grid is one of main technical parameters of the grounding grid.
At present, the pile foundation of the power transmission tower is constructed by adopting cast-in-place piles, the power transmission and transformation project is often constructed in the field or in a steep terrain area, and the foundation construction quality is easily influenced by the field environment and the construction conditions. Secondly, the foundation is in complex environments such as drought, low temperature, sand blown by the wind and the like, the crack resistance and the corrosion resistance of the foundation are poor, once the crack is generated on the foundation, the crack growth is accelerated under the influence of water and low temperature in the soil body, and the concrete foundation is damaged. Meanwhile, the power transmission tower foundation belongs to hidden engineering, cracks are not easy to perceive in the foundation or on the surface of the foundation, the follow-up repairing difficulty is high, and related problems need to be solved urgently. In addition, due to the influence of deep soft soil or large-area soft and weak underlying layers at the lower part of the foundation, the conventional foundation treatment or pile forming mode has relatively poor solving effect, high cost and inconvenient construction, and the situations bring a plurality of difficulties to the construction of the field power transmission tower foundation.
Disclosure of Invention
In order to solve the problems in the background art, the invention provides a northwest wet-dry freeze-thaw coupling environment assembly type power transmission tower foundation structure.
The invention adopts the following technical scheme: a northwest region wet-dry freeze-thaw coupling environment assembly type power transmission tower foundation structure comprises a bearing platform, a pile cap unit and a pile body unit; the pile cap unit is connected with the upper end of the pile body unit, and the lower end of the pile body unit is connected with the bearing platform.
Compared with the prior art, the invention has the beneficial effects that:
the invention can efficiently and conveniently solve the problems of pile foundation construction and grounding resistance in power transmission and transformation projects in northwest special environments, is not limited by construction sites, meteorological and geological conditions and the like, and avoids the problems of poor concrete quality, low bearing capacity, low material corrosion resistance, high repairing and reinforcing difficulty and the like caused by large-volume integral pouring of concrete in special soil environments such as saline soil, deep soft soil or large-area soft and weak subjacent layers at the lower part of the foundation; the concrete pile body, the pile cap, the bearing platform and other components are prefabricated in a factory, the anticorrosion water-stop coating treatment is carried out on the surface of the concrete on site, and then the assembly and hoisting are carried out, so that the durability, bearing capacity, service performance, anticorrosion, cold resistance, freezing resistance and other capabilities of the concrete are greatly improved, the construction is efficient and rapid, and the input cost of materials and manpower is saved; in addition, the design of the grooves reserved on the periphery of the pile cap is convenient for being connected with other pile caps to form bases of upper structures of the power transmission tower, the structural integrity is enhanced, and once the foundation is damaged to a certain extent due to the influence of the impentability under the subsequent long-term service state requirement, the damaged parts can be replaced by adopting a direct replacement method, the repairing and reinforcing quality and speed are greatly improved, the problems of foundation construction quality, grounding resistance and repairing and reinforcing in the service period of the foundation of the current to-be-built power transmission engineering pile foundation in the field or under special geological features are effectively solved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of a pile head;
fig. 3 is a schematic structural view of a pile body;
fig. 4 is a schematic structural view of the pile unit;
FIG. 5 is a schematic structural view of a pile cap;
fig. 6 is a top view of fig. 1.
Detailed Description
The technical solutions in the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the invention, rather than all embodiments, and all other embodiments obtained by those skilled in the art without any creative work based on the embodiments of the present invention belong to the protection scope of the present invention.
A northwest region wet-dry freeze-thaw coupling environment assembly type power transmission tower foundation structure comprises a bearing platform 11, a pile cap unit and a pile body unit; the pile cap unit is connected with the upper end of the pile body unit, and the lower end of the pile body unit is connected with the bearing platform 11.
The pile body unit comprises a pile head 7, a pile head reserved column 2, a pile body 10, a pile body reserved column 8 and a plurality of prestressed steel bars 3; the pile head 7 and the pile body 10 are both of a ring body structure with a hollow cavity, the pile head 7 and the pile body 10 are coaxially arranged in an equal-diameter up and down manner and are connected through polymer cement mortar 9, and relevant waterproof anticorrosive coatings are sprayed; the lower end of the hollow cavity of the pile head 7 is fixedly connected with the upper end of the pile head reserved column 2, the lower end of the pile head reserved column 2 extends out of the outer side of the pile head 7 and then is inserted into the upper end of the hollow cavity of the pile body 10, and then mortar caulking is used for filling and compacting; the lower end of the hollow cavity of the pile body 10 is fixedly connected with the upper end of the pile body reserved column 8, the lower end of the pile body reserved column 8 extends out of the outer side of the pile body 10 and then is inserted into the bearing platform 11, and the lower end face of the pile head reserved column 2 is attached to the upper end face of the pile body reserved column 8; a plurality of prestressed reinforcements 3 are uniformly distributed in the pile wall of the pile body 10 along the circumferential direction of the pile wall, a plurality of pile body reinforcement holes are formed in the pile wall of the pile head 7 in a manner of penetrating through the height direction of the pile body reinforcement holes, the prestressed reinforcements are arranged in a one-to-one correspondence manner to the prestressed reinforcements 3, and the plurality of prestressed reinforcements 3 penetrate into the corresponding pile body reinforcement holes respectively.
A reinforcing body 14 is arranged at the joint of the pile head 7 and the pile body 10, the reinforcing body is made of semi-rigid rubber, and the reinforcing body 14 comprises an anchor bolt 12 and a threaded anchor bolt 13; the outer wall of the joint of the pile head 7 and the pile body 10 is uniformly provided with an even number of thread anchor bolts 13 along the circumferential direction, every two thread anchor bolts 13 correspond to each other, the thread anchor bolts 13 are respectively connected through corresponding anchor bolts 12, and the upper pile body and the lower pile body are secondarily fixed and waterproofly reinforced through the anchor bolts and the anchor bolts.
The pile cap unit comprises a pile cap 1 and a pile cap reserved column 6; the lower end face of the pile cap 1 is provided with a pile body connecting groove 4, the groove top wall of the pile body connecting groove 4 penetrates through the upper end face of the pile cap 1 along the circumferential direction and is provided with a plurality of pile cap reinforcing steel bar holes 19, the pile cap reinforcing steel bar holes 19 and the pile body reinforcing steel bar holes are arranged in a one-to-one correspondence mode, a pile cap reserved column 6 is arranged in the middle of the pile body connecting groove 4, the upper end of a pile head 7 is arranged in the pile body connecting groove 4, the pile cap reserved column 6 is arranged in a hollow cavity of the pile head 7, the lower end face of the pile cap reserved column 6 is attached to the upper end of the pile head reserved column 2, and the pile cap reserved column 6 is caulked and filled with polymer cement mortar with self-compaction and corrosion resistance after being inserted; the upper ends of the prestressed steel bars 3 respectively pass through the corresponding pile cap steel bar holes 19 and then are in anchoring connection with the upper end of the pile cap 1.
The upper end of the outer wall of the pile head 7 is provided with a plurality of (four) connecting lug plates 18 along the circumferential direction, the side wall of the pile body connecting groove 4 is provided with lug plate grooves 5 corresponding to the connecting lug plates 18, the pile head 7 and the pile cap 1 are connected through reinforcing steel bars after the connecting lug plates 18 are inserted into the corresponding lug plate grooves 5, each connecting lug plate 18 penetrates through the thickness direction of the pile body connecting groove, four hollow holes are formed along the height direction of the pile head, after the pile head 7 is inserted into the pile cap 1, the four hollow holes of each connecting lug plate 18 are respectively penetrated through four anchoring ports and holes reserved in the pile body connecting groove 4 by adjusting the pile cap 1, the reinforcing steel bars are inserted for two-section anchoring, and a small catheter is inserted for grouting and filling; the pile caps are connected with each other through a rectangular cross beam or a steel frame in a groove in the side wall of the pile cap to form a base bearing platform frame of the overhead transmission line upper structure.
And after the pile head is connected with the pile cap and the pile body respectively, the anti-corrosion cold-resistant water-stop coating treatment on the surface of the pile body is started, and then the pile body is installed on the pile foundation in a static pressure hammering mode.
And connecting the pile head with the pile cap after the installation of each section is completed, pressing the pile cap by using a pile machine, rechecking the verticality and the measurement penetration degree, and finally performing a static load test on the pile foundation to complete the acceptance work of the pile foundation.
The pile cap 1 is prefabricated in a factory, is made of reinforced concrete, has the concrete strength grade of C40, and is used for processing the prestressed reinforcement 3 by adopting a post-tensioning method.
The upper surface of the bearing platform 11 is provided with a slot, the bottom surface of the slot is provided with a plurality of bearing platform reinforcing steel bar holes 17 along the lower end surface of the slot which penetrates through the bearing platform 11 along the circumferential direction, the plurality of bearing platform reinforcing steel bar holes M are arranged in one-to-one correspondence with the plurality of pile body reinforcing steel bar holes, the lower end of the pile body 10 is inserted into the slot in a matching manner, and the lower ends of the plurality of prestressed steel bars 3 are connected with the lower end of the bearing platform 11 in an anchoring manner after penetrating through the corresponding bearing platform reinforcing steel bar holes 17 respectively.
In the process, the prestressed reinforcement 3 can be welded, and the length of the reinforcement is prolonged, so that the requirement of the next section of anchoring end can be met.
The lower end of the bearing platform 11 is provided with a plurality of vertically arranged miniature steel pipe piles 15 along the circumferential direction.
A plurality of miniature steel-pipe piles 15 are connected through steel truss 16, strengthen miniature pile whole harmony and rigidity, solve simultaneously and satisfy under deep soft soil or the basis have the soft lower berth operating mode demand of large tracts of land.
The assembled reinforced concrete structure is one of the important directions of the development of the building structure in China, is beneficial to the development of the industrialization of the building in China, improves the production efficiency, saves energy, develops green and environment-friendly buildings, and is beneficial to improving and ensuring the quality of the building engineering. Compared with a cast-in-place construction method, the assembly type construction method can save energy and materials, reduce field interference, has high concrete quality, can effectively solve the problem of construction quality of the reinforced concrete foundation, and improves the bearing capacity and the corrosion resistance of the foundation.
All pile caps and pile body components are assembled after prefabrication is completed, and finally, the pile caps and the pile body components are hoisted to a construction site for installation. In the aspect of building materials, graphene is doped into concrete to form the graphene-based composite concrete material, so that the mechanical property and durability of the cement-based composite material are maintained, and the graphene-based composite concrete material has conductivity and pressure sensitivity. And meanwhile, bentonite is used as an expansion material, sodium silicate is used as a bonding material to prepare a capsule core of the microcapsule, and ethyl cellulose, sodium silicate and absolute ethyl alcohol are combined to prepare a capsule wall material, so that the microcapsule for self-repairing is finally obtained.
The self-repairing concrete is a novel artificially synthesized material, and the material can automatically repair the loss of a concrete structure through the repairing material embedded in the concrete. Based on the bionics theory, the repairing material is pre-buried in the concrete, when the concrete structure is damaged, the repairing material is triggered by different triggering mechanisms (such as temperature, alkalinity or cracks) to repair the damaged area, so that the service life of the concrete structure is prolonged, and the durability of the concrete structure is improved. Meanwhile, the intelligent concrete grounding is adopted, and the purpose of reducing the grounding resistance can be achieved by reducing the contact resistance between the surface of the grounding electrode and the soil and the resistance of a path through which current passes when the current is diffused in the ground. The method has the advantages of small grounding resistance, stable grounding resistance, long service life and the like, and can be widely popularized and applied to grounding engineering in high-resistivity areas.
The test principle of the invention is as follows:
according to the construction requirements of the pile foundation in the power transmission engineering and the structural engineering, the related assembled pre-stressed pile foundation structure is researched and developed. The pile structure is formed by adopting an upper prestressed tendon, a lower prestressed tendon and a middle concrete column caulking connection assembling pile body, a pile head and pile cap embedding method and a prestressed reinforcement bolt anchoring mode, and the pile cap has a certain protection effect on the pile head and the pile body in the pile pressing process. Meanwhile, the pile cap and the groove reserved in front of the pile cap can be convenient for connecting a steel structure or a reinforced concrete module to form a whole, and then the whole is developed into a lower pile and an upper overhead transmission line steel structure base platform. The pile head and the pile body are connected by adopting an external connection reinforcement body, the reinforcement body is made of semi-rigid rubber, the pile head and the pile body are secondarily fixed and waterproofly reinforced through anchor bolts and anchor bolts, the base and the pile body are connected similarly to each subsection connection, the lower part of the bearing platform is externally connected with a miniature steel pipe pile, the miniature piles are connected by utilizing a steel truss, the overall coordination and rigidity of the miniature piles are enhanced, and the requirement of large-area weak lower lying layer working condition under deep soft soil or foundation is met.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (8)
1. The utility model provides a northwest district wet-dry freeze thawing coupling environment assembled transmission tower foundation structure which characterized in that: comprises a bearing platform (11), a pile cap unit and a pile body unit; the pile cap unit is connected with the upper end of the pile body unit, and the lower end of the pile body unit is connected with the bearing platform (11).
2. The northwest wet-dry freeze-thaw coupled environment fabricated transmission tower infrastructure of claim 1, wherein: the pile body unit comprises a pile head (7), a pile head reserved column (2), a pile body (10), a pile body reserved column (8) and a plurality of prestressed steel bars (3); the pile head (7) and the pile body (10) are both of a ring body structure with a hollow cavity, and the pile head (7) and the pile body (10) are coaxially arranged in an equal-diameter up-down mode and are connected through polymer cement mortar (9); the lower end of the hollow cavity of the pile head (7) is fixedly connected with the upper end of the pile head preformed column (2), and the lower end of the pile head preformed column (2) extends out of the outer side of the pile head (7) and then is inserted into the upper end of the hollow cavity of the pile body (10); the lower end of the hollow cavity of the pile body (10) is fixedly connected with the upper end of the pile body reserved column (8), the lower end of the pile body reserved column (8) extends out of the outer side of the pile body (10) and then is inserted into the bearing platform (11), and the lower end face of the pile head reserved column (2) is attached to the upper end face of the pile body reserved column (8); be equipped with a plurality of prestressing steel (3) in the pile wall of pile body (10), the pile wall of pile head (7) be equipped with a plurality of with the pile body reinforcing bar hole that prestressing steel (3) one-to-one set up, a plurality of prestressing steel (3) penetrate corresponding pile body reinforcing bar downthehole respectively.
3. The northwest wet-dry freeze-thaw coupled environment fabricated transmission tower infrastructure of claim 2, wherein: a reinforcement body (14) is arranged at the connection part of the pile head (7) and the pile body (10), and the reinforcement body (14) comprises an anchor bolt (12) and a threaded anchor bolt (13); the outer wall of the connection part of the pile head (7) and the pile body (10) is provided with an even number of thread anchor bolts (13), and every two corresponding thread anchor bolts (13) are respectively connected through corresponding anchor bolts (12).
4. The northwest wet-dry freeze-thaw coupled environment fabricated transmission tower infrastructure of claim 2 or 3, wherein: the pile cap unit comprises a pile cap (1) and a pile cap reserved column (6); the lower terminal surface of pile cap (1) is equipped with pile body spread groove (4), the groove top wall of pile body spread groove (4) is equipped with a plurality of pile cap reinforcing bar holes (19), a plurality of pile cap reinforcing bar holes (19) set up with a plurality of pile body reinforcing bar hole one-to-ones to the middle part of pile body spread groove (4) is equipped with pile cap reserved column (6), the upper end setting of pile head (7) is in pile body spread groove (4), and pile cap reserved column (6) set up in pile head (7) cavity, and the lower terminal surface of pile cap reserved column (6) and the upper end laminating setting of pile head reserved column (2), the upper end anchor of a plurality of prestressing tendons (3) is connected with the upper end anchor of pile cap (1) after passing corresponding pile cap reinforcing bar hole (19) respectively.
5. The northwest wet-dry freeze-thaw coupled environment fabricated transmission tower infrastructure of claim 4, wherein: the upper end of pile head (7) outer wall is equipped with a plurality of connection otic placodes (18), the lateral wall of pile body spread groove (4) be equipped with connect otic placode groove (5) that otic placode (18) are corresponding, pile head (7) and pile cap (1) insert behind the otic placode groove (5) that correspond at connection otic placode (18) through the steel bar connection.
6. The northwest wet-dry freeze-thaw coupled environment fabricated transmission tower infrastructure of claim 4, wherein: the upper surface of cushion cap (11) is equipped with the slot, the tank bottom surface of slot is equipped with a plurality of cushion cap reinforcing bar holes (17), a plurality of cushion cap reinforcing bar holes (M) and a plurality of pile body reinforcing bar hole one-to-one set up, the lower extreme of pile body (10) inserts in the slot matchingly, and the lower extreme of a plurality of prestressing tendons (3) is connected with the lower extreme anchor of cushion cap (11) after passing corresponding cushion cap reinforcing bar hole (17) respectively.
7. The northwest wet-dry freeze-thaw coupled environment fabricated transmission tower infrastructure of claim 6, wherein: the lower end of the bearing platform (11) is provided with a plurality of miniature steel pipe piles (15).
8. The northwest wet-dry freeze-thaw coupled environment fabricated transmission tower infrastructure of claim 7, wherein: the micro steel pipe piles (15) are connected through steel trusses (16).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111405111.7A CN113863358A (en) | 2021-11-24 | 2021-11-24 | Northwest area wet-dry freeze-thaw coupling environment assembled transmission tower foundation structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111405111.7A CN113863358A (en) | 2021-11-24 | 2021-11-24 | Northwest area wet-dry freeze-thaw coupling environment assembled transmission tower foundation structure |
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| CN113863358A true CN113863358A (en) | 2021-12-31 |
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| CN202111405111.7A Pending CN113863358A (en) | 2021-11-24 | 2021-11-24 | Northwest area wet-dry freeze-thaw coupling environment assembled transmission tower foundation structure |
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| CN (1) | CN113863358A (en) |
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