AU2020376450A1 - UHPC-NC composite pile foundation and construction method therefor for power transmission tower in saline-alkali area - Google Patents
UHPC-NC composite pile foundation and construction method therefor for power transmission tower in saline-alkali area Download PDFInfo
- Publication number
- AU2020376450A1 AU2020376450A1 AU2020376450A AU2020376450A AU2020376450A1 AU 2020376450 A1 AU2020376450 A1 AU 2020376450A1 AU 2020376450 A AU2020376450 A AU 2020376450A AU 2020376450 A AU2020376450 A AU 2020376450A AU 2020376450 A1 AU2020376450 A1 AU 2020376450A1
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- AU
- Australia
- Prior art keywords
- uhpc
- pile
- foundation
- sleeve
- external sleeve
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
- E02D27/12—Pile foundations
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/60—Piles with protecting cases
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/66—Mould-pipes or other moulds
- E02D5/665—Mould-pipes or other moulds for making piles
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/0007—Production methods using a mold
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/0023—Cast, i.e. in situ or in a mold or other formwork
Abstract
The present invention relates to the field of power transmission line tower foundations. Disclosed are an ultra-high performance reactive powder concrete (UHPC)-normal concrete (NC) composite pile foundation and a pile forming method therefor, which are applicable to strongly corrosive salinized soil areas or geological condition areas with obvious dry-wet and freeze-thaw alternate action. The foundation comprises: a foundation main pile penetrating through a soil layer to a supporting layer, and a prefabricated UHPC outer sleeve, wherein the portion, below the bottom of the UHPC outer sleeve, of the foundation main pile is of a columnar structure, and the outer side surface of a section in contact with the sleeve changes along with the shape of the inner wall of the sleeve. Compared with the conventional anti-corrosion measures, under the same geological conditions and the same external load effect and on the basis of excellent material performance of UHPC, the UHPC-NC composite pile foundation has the advantages that the corrosion resistance of the power transmission tower foundation in a saline-alkali area is greatly improved, and the initial construction cost and the whole-life maintenance cost are greatly reduced. The prefabricated sleeve is combined with a dry operation method of bored (digged) cast-in-place pile construction method, so as to ensure that the quality of a pile body is good, residents are not disturbed during construction, and environmental hazards are small.
Description
[0001] The present disclosure relates to the field of power transmission tower project foundations, and in particular to a UHPC(ultrahigh performance concrete)-NC (normal concrete) combined pile foundation applicable to highly corrosive saline region or regions with geological conditions of obvious dry-wet and freeze-thaw alternating effect.
[0002] The power transmission tower projects are located in a highly corrosive saline soil area in the northwest saline-alkali region. At the same time, due to obvious dry-wet and freeze-thaw alternating effect, the foundations are liable to severe corrosion, resulting in tilting or toppling of the towers, and severely affecting the safety and normal operation of the power transmission and transformation lines.
[0003] At present, for the corrosion prevention of the concrete foundations in the saline-alkali region, coating protection method, cathodic protection measures, high-performance and polymer concrete and isolation layer and the like are generally adopted in the engineerings, where (1) the coating protection method is usually applied in the power transmission line projects, the coatings mostly come from petrochemical derivatives with their service life of less than 10-15 years; it is difficult to construct and subsequent repair is much more difficult to carry out; (2) the cathodic protection operation of impressed power source requires a large amount of maintenance work, which is thus not suitable for scale power transmission line projects; (3) Full high-performance concrete or polymer concrete are adopted for the power foundations, which can retard corrosion to some extent, but the concrete has an excessively high cost (for example, acrylic copolymer emulsion mortar is RMB4000/m3 higher than ordinary mortar), and its potential pollution problem also hinders its application prospect in the power transmission line projects; (4) the isolation layer mainly adopts mortared block stones, steel plate sleeve of cathodic protection, and polymer concrete, but has the disadvantages of poor corrosion prevention, high construction requirements, large consumption of materials, limited use of sacrificial anode and the like.
[0004] In order to solve the technical problems in the prior art, the present disclosure provides a power transmission tower UHPC-NC combined pile foundation in a saline-alkali region to outsource a UHPC external sleeve to be prefabricated in a factory with a foundation main pile constructed by mechanical excavation or manual boring and grouting so as to improve the corrosion resistance of power transmission tower foundations and lower initial costs and full-life maintenance costs under the precondition of guaranteeing construction progress.
[0005] The object of the present disclosure is realized by employing the following technical solution: a power transmission tower UHPC-NC combined pile foundation in a saline-alkali region includes a foundation main pile penetrating through a soil layer to a bearing layer and a prefabricated UHPC external sleeve, where the prefabricated UHPC external sleeve is provided with a wave-shaped inner wall, the foundation main pile is of columnar structure below a bottom end of the UHPC external sleeve and a section of the foundation main pile in contact with the UHPC external sleeve changes along with the shape of the inner wall of the UHPC external sleeve.
[0006] Preferably, the UHPC external sleeve is prefabricated by inflatable inner mould technique. The UHPC external sleeve is made to have a wave-shaped inner wall by use of inner mould shape. The prefabricated UHPC external sleeve may be made into a hollow square sleeve or a tubular sleeve according to size and shape of the main pile.
[0007] At the same time, the present disclosure provides a construction method of the above power transmission tower UHPC-NC combined pile foundation in a saline-alkali region for fabricating the above combined pile, which includes the following steps.
[0008] (1) A grouting pile is constructed by constructing a hole-drilling (digging) grouting pile using a dry operation method, and the hole digging is performed to a bottom design elevation of the foundation main pile by using an auger bit with a diameter equal to or slightly greater than the foundation main pile or manually.
[0009] (2) Hole expansion is performed using an auger bit with a diameter equal to or slightly greater than an outer diameter of the UHPC external sleeve or manually to a position below a bottom elevation of a salt-alkali-rich soil layer.
[0010] (3) The prefabricated UHPC external sleeve is vertically hoisted into the hole to allow the bottom end of the sleeve to contact with the bottom of the expansion hole, and then positioned and fixed.
[0011] (4) Hole cleaning is performed, a prefabricated reinforcement cage is vertically hoisted into the hole, and positioned and then fixed, and concrete is grouted to a position equal to the elevation of the UHPC external sleeve.
[0012] (5) Pile formation is completed to obtain the power transmission tower UHPC-NC combined pile foundation in a saline-alkali region.
1)
[0013] The present disclosure has the following beneficial effects: based on the UHPC-NC novel pile foundation technique as described above, the UHPC external sleeve layer can be prefabricated in a factory and mounted on site to realize partial factory-manufacturing of the foundation in a construction process, thereby saving the construction period. The UHPC external sleeve is prefabricated using a custom wave-shaped inflatable inner mould so that its inner wall is made into wave shape, thereby improving the bonding performance of the sleeve and a contact surface of the foundation main pile. The UHPC layer is used as a protection layer of the internal core area to increase the corrosion resistance as well as replacing the sleeve, thus prevent hole collapse of the grouting pile. In this way, the construction difficulty is reduced, the costs are lowered at the same time, creating conditions for batch industrialized production. Thus it is suitable for the characteristics of the power transmission and transformation projects. The combination of the prefabrication of the sleeve and the hole-drilling (digging) grouting pile method using a dry operation method can guarantee better pile body quality with no disturbance to people and little environmental harm.
[0014] FIG. 1 is a sectional view of a power transmission tower UHPC-NC combined pile foundation in a saline-alkali region according to the present disclosure.
[0015] FIG. 2 is a sectional view taken along 1-1 in FIG. 1. !0 [0016] Numerals of the drawings are described as follows. 1 foundation main pile penetrating through soil layer to bearing layer; 2 prefabricated UHPC external sleeve, 3 wave-shaped inner wall.
[0017] As shown in FIGS. 1 and 2, a power transmission tower UHPC-NC combined pile foundation in a saline-alkali region in the present disclosure includes a foundation main pile 1 penetrating through a soil layer to a bearing layer and a prefabricated UHPC external sleeve 2, where the prefabricated UHPC external sleeve 2 is provided with a wave-shaped inner wall, the foundation main pile 1 is of columnar structure below a bottom end of the UHPC external sleeve 2 and a section of the foundation main pile in contact with the UHPC external sleeve 2 is shaped like wave.
[0018] The UHPC external sleeve 2 of the present disclosure is prefabricated by using a custom wave-shaped inner mould so as to form a wave-shaped inner wall 3 as shown in FIG. 2. The prefabricated UHPC external sleeve 2 may be made into a hollow pipe pile according to size and shape of a main column.
[0019] The construction process flow of the power transmission tower UHPC-NC combined pile foundation in a saline-alkali region includes the following steps.
[0020] 1. A grouting pile is constructed by constructing a hole-drilling (digging) grouting pile using a dry operation method, and the hole digging is performed to a bottom design elevation of the foundation main pile by using an auger bit with a diameter equal to or slightly greater than the foundation main pile or manually.
[0021] 2. Hole expansion is performed using an auger bit with a diameter equal to or slightly greater than an outer diameter of the UHPC external sleeve 2 or manually to 500mm-1000mm below a bottom elevation of a salt-alkali-rich soil layer.
[0022] 3. The prefabricated UHPC external sleeve 2 is vertically hoisted into the hole to allow the bottom end of the sleeve to contact with the bottom of the expansion hole, and then positioned and fixed.
[0023] 4. Hole cleaning is performed, a prefabricated reinforcement cage is vertically hoisted into the hole, and positioned and then fixed, and concrete is grouted to a position equal to the elevation of the UHPC external sleeve 2.
[0024] 5. Pile formation is completed to obtain the UHPC-NC combined pile foundation. !0 When the concrete of the grouting pile reaches a design strength, pouring of the bearing platform is performed.
[0025] In conclusion, based on the pile foundation technique as described above, the UHPC external sleeve layer can be prefabricated in a factory and mounted on site to realize partial factory-manufacturing of the foundation, thereby saving the construction period. The UHPC external sleeve is prefabricated using a custom wave-shaped inflatable inner mould so that its inner wall is made into wave shape, thereby improving the synergic working capability of the sleeve and the foundation main pile. The UHPC layer is used as a protection layer of the internal core area to increase the corrosion resistance as well as replacing the sleeve. In this way, the construction difficulty is reduced, the costs are lowered at the same time, creating conditions for batch industrialized production. At the same time, the combination of the prefabrication of the external sleeve and the hole-drilling (digging) grouting pile method using a dry operation method can guarantee better pile body quality with no disturbance to people and little environmental harm. It can be seen that use of the UHPC-NC combined pile foundation in a saline-alkali region will bring good economic benefits and social benefits.
[0026] Example A
[0027] The construction work is carried out according to a power transmission tower UHPC-NC combined pile foundation in a saline-alkali region and a piling method as shown in FIG. 1 in the present disclosure. The specific steps are described below.
[0028] (1) The UHPC external sleeve with outer diameter of1000mm, inner diameter average value of 800mm and length of 2m is prefabricated in a factory, and then transported to site for use; the UHPC dry powder material is provided by Ningxia Jinshi Weiye Architectural Decoration Engineering Co., Ltd.
[0029] (2) The site is leveled, a working platform is constructed, a drill is erected, and drilling is performed using an auger bit with a diameter of 800mm to a design elevation of -6.000m, where it is checked whether a borehole is deflected during drilling process.
[0030] (3) Hole expansion is performed using an auger bit with a diameter of 1000mm to the elevation of 100mm below the saline-alkali soil layer, where it is checked whether the borehole is deflected during the hole expansion process.
[0031] (4) The prefabricated UHPC external sleeve is vertically hoisted into the hole, positioned and fixed.
[0032] (5) Hole cleaning is performed and a prefabricated reinforcement cage is vertically hoisted into the hole, positioned and fixed.
[0033] (6) Pipe is placed to grout concrete to a position equal to the elevation of the top end of the UHPC external sleeve and extend into the top bearing platform, and the pipe top is !0 embedded 50mm into the bearing platform or raft plate.
[0034] Piling quality is checked.
[0035] Finally, it should be pointed out that the foregoing descriptions are merely preferred examples of the present disclosure, and are not intended to limit the present disclosure. Although the present disclosure is described in detail by referring to the above examples, persons skilled in the art may still modify the technical solution of each example described above or make equivalent substitutions for a part of technical features in the above examples. Any modifications, equivalent substitutions, improvements, and the like made within the spirit and principles of the present disclosure shall be included in the scope of protection of the present disclosure.
Claims (3)
1. A power transmission tower UHPC-NC combined pile foundation in a saline-alkali region, comprising a foundation main pile (1) penetration through a soil layer to a bearing layer, and a prefabricated UHPC external sleeve (2), wherein the prefabricated UHPC external sleeve (2) is provided with a wave-shaped inner wall (3), the foundation main pile (1) is of columnar structure below a bottom end of the prefabricated UHPC external sleeve (2), and a section of the foundation main pile (1) in contact with the UHPC external sleeve (2) changes along with the shape of the inner wall of the UHPC external sleeve (2).
2. The power transmission tower UHPC-NC combined pile foundation in a saline-alkali region according to claim 1, wherein the UHPC external sleeve (2) is prefabricated by inflatable inner mould technique; the UHPC external sleeve is made to have a wave-shaped inner wall (3) by use of inner mould shape; the prefabricated UHPC external sleeve (2) is made into a hollow square sleeve or a tubular sleeve according to size and shape of the main pile.
3. A construction method of the power transmission tower UHPC-NC combined pile foundation in a saline-alkali region according to claim 1, comprising the following steps: (1) constructing a grouting pile by constructing a hole-drilling (digging) grouting pile using a dry operation method, and performing the hole digging to a bottom design elevation of the foundation main pile by using an auger bit with a diameter equal to or slightly greater than the !0 foundation main pile (1) or manually; (2) performing hole expansion using an auger bit with a diameter equal to or slightly greater than an outer diameter of the UHPC external sleeve (2) or manually to a position below a bottom elevation of a salt-alkali-rich soil layer; (3) vertically hoisting the prefabricated UHPC external sleeve (2) into the hole to allow the bottom end of the sleeve to contact with the bottom of the expansion hole, and then positioning and fixing; (4) performing hole cleaning, vertically hoisting a prefabricated reinforcement cage into the hole, and positioning and then fixing, and grouting concrete to a position equal to the elevation of the UHPC external sleeve (2); completing pile formation to obtain the power transmission tower UHPC-NC combined pile foundation in a saline-alkali region.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911034846.6A CN110924424A (en) | 2019-10-29 | 2019-10-29 | UHPC-NC combined pile foundation for power transmission tower in saline-alkali area and construction method |
| CN201911034846.6 | 2019-10-29 | ||
| PCT/CN2020/115198 WO2021082769A1 (en) | 2019-10-29 | 2020-09-15 | Uhpc-nc composite pile foundation and construction method therefor for power transmission tower in saline-alkali area |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AU2020376450A1 true AU2020376450A1 (en) | 2021-06-10 |
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ID=69849669
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2020376450A Abandoned AU2020376450A1 (en) | 2019-10-29 | 2020-09-15 | UHPC-NC composite pile foundation and construction method therefor for power transmission tower in saline-alkali area |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN110924424A (en) |
| AU (1) | AU2020376450A1 (en) |
| WO (1) | WO2021082769A1 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110924424A (en) * | 2019-10-29 | 2020-03-27 | 国家电网有限公司 | UHPC-NC combined pile foundation for power transmission tower in saline-alkali area and construction method |
| CN113378259B (en) * | 2021-05-14 | 2022-04-01 | 中铁第四勘察设计院集团有限公司 | Method for checking and calculating hogging moment area section of UHPC-NC superimposed bridge deck steel-concrete composite beam |
| CN113756293A (en) * | 2021-09-26 | 2021-12-07 | 北京首钢国际工程技术有限公司 | Post-grouting cast-in-place pile suitable for strongly corrosive geological conditions and construction method thereof |
| CN114447639A (en) * | 2022-03-17 | 2022-05-06 | 中国电建集团福建省电力勘测设计院有限公司 | Vertical grounding structure with anchor disc and construction method thereof |
| CN114809065A (en) * | 2022-04-13 | 2022-07-29 | 中国能源建设集团江苏省电力设计院有限公司 | Power transmission tower foundation structure and construction method |
| CN115596007B (en) * | 2022-10-18 | 2023-06-27 | 河北工程大学 | Combined type mooring bollard |
| CN116044881B (en) * | 2023-03-30 | 2023-06-02 | 河北邦德威电力器材股份有限公司 | Anticorrosive wind-powered electricity generation crab-bolt and production assembly quality thereof |
| CN117569302B (en) * | 2024-01-15 | 2024-04-05 | 中国电建集团西北勘测设计研究院有限公司 | Water injection spiral drilling pore-forming construction method suitable for saline-alkali soil |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2437468A1 (en) * | 1978-09-27 | 1980-04-25 | Labrue Jean Marie | HOLLOW AUGER FOR DRILLING FOR MOLDING CONCRETE PILES |
| CN101343871B (en) * | 2008-08-22 | 2014-09-03 | 北京航空航天大学 | Composite pile with high permanent stability protection layer and its production and construction method |
| CN202519664U (en) * | 2012-03-21 | 2012-11-07 | 河南理工大学 | High tensile reinforcement reinforced prestressed UHPC (Ultra High Performance Concrete) thin-wall tubular pile component |
| CN203174594U (en) * | 2013-03-27 | 2013-09-04 | 天津市市政工程设计研究院 | Bridge lower portion structure prevented from being corroded by high-concentration saline solution |
| CN104762961B (en) * | 2015-04-21 | 2016-03-30 | 福州大学 | A kind of ultra-high performance concrete and ordinary concrete compound pile and construction method thereof |
| CN105442590A (en) * | 2015-12-28 | 2016-03-30 | 湖南大学 | Reactive powder concrete pipe column for ocean engineering |
| CN106284307B (en) * | 2016-10-14 | 2018-07-20 | 福州大学 | Threaded prefabricated U HPC pile piles and its making construction method |
| FR3076562B1 (en) * | 2018-01-08 | 2020-01-24 | Yves Brugeaud | PIEU EN BFUP - COMPOSITE PIEU |
| CN208379423U (en) * | 2018-03-16 | 2019-01-15 | 广州大学 | A kind of concrete column |
| CN109853605B (en) * | 2019-02-14 | 2023-11-03 | 中交第二航务工程局有限公司 | UHPC pile column integrated structure free of bearing platform and construction method |
| CN109881662B (en) * | 2019-02-20 | 2023-11-24 | 中交第二航务工程局有限公司 | Large-diameter high-performance UHPC-steel pipe composite pile foundation and construction method thereof |
| CN110924424A (en) * | 2019-10-29 | 2020-03-27 | 国家电网有限公司 | UHPC-NC combined pile foundation for power transmission tower in saline-alkali area and construction method |
-
2019
- 2019-10-29 CN CN201911034846.6A patent/CN110924424A/en active Pending
-
2020
- 2020-09-15 WO PCT/CN2020/115198 patent/WO2021082769A1/en active Application Filing
- 2020-09-15 AU AU2020376450A patent/AU2020376450A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| CN110924424A (en) | 2020-03-27 |
| WO2021082769A1 (en) | 2021-05-06 |
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| MK5 | Application lapsed section 142(2)(e) - patent request and compl. specification not accepted |