CN114737594A - Large-span unbonded prestressed tendon's fish belly formula foundation beam - Google Patents
Large-span unbonded prestressed tendon's fish belly formula foundation beam Download PDFInfo
- Publication number
- CN114737594A CN114737594A CN202210486765.5A CN202210486765A CN114737594A CN 114737594 A CN114737594 A CN 114737594A CN 202210486765 A CN202210486765 A CN 202210486765A CN 114737594 A CN114737594 A CN 114737594A
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- unbonded
- short upright
- fish
- fish belly
- span
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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
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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
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0004—Synthetics
- E02D2300/0018—Cement used as binder
- E02D2300/002—Concrete
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0026—Metals
- E02D2300/0029—Steel; Iron
Abstract
A fish-bellied foundation beam of a large-span unbonded prestressed tendon comprises support piles at two ends, a middle cross beam and unbonded steel strands, wherein the high-strength unbonded prestressed steel strands, short vertical columns with different lengths and reinforced concrete cross beams are adopted to construct a foundation beam with variable height, large span and high bearing capacity; the appearance is similar to the fish belly. The concrete beam and the terrace are integrally cast and axially stressed, and the high-strength prestressed tendon is tensioned, so that the advantages of high-strength steel can be better exerted; the unbonded prestressed tendon is adopted as a high-strength material, so that the technology is mature, and the anticorrosion is durable. The technical scheme provided by the invention has the advantages of extremely high cost performance, convenience and quickness in construction and high bearing capacity. The stress of the unbonded steel strand can be designed according to the requirement of ground bearing capacity and is convenient to adjust; the problem of uneven settlement of a large-area field under the condition of deep sea silt geology is conveniently solved, and the cost performance is extremely high. The lateral instability of the device can be effectively prevented; overhead ground: no moisture and alkali return, definite force transmission path and adjustable and controllable sedimentation.
Description
Technical Field
The invention relates to a foundation construction technology, in particular to a fish-bellied foundation beam with large span and unbonded prestressed tendons.
Background
China has wide land area and various geology, and among various geology, the sea-silted geology has the characteristics of low bearing capacity, large compressibility, small permeability coefficient and the like, so that the problem of uneven settlement of a foundation is very easily caused, and the building is inclined or even collapsed. Therefore, the construction quality, the construction cost, the construction period and the like of the building on the geology are greatly influenced.
Disclosure of Invention
The invention aims to solve the technical problem of the prior art and provides a long-span unbonded prestressed rib fish-bellied foundation beam convenient for prestress regulation and control for uneven settlement of a large-area field under the condition of deep sea siltation.
The invention aims to solve the technical problem by adopting the following technical scheme, and the fish belly type foundation beam with the large span and no binding prestressed tendons is characterized in that:
the construction method comprises two end supporting piles, a middle cross beam and unbonded steel strands, and specifically comprises the following steps:
firstly, driving support piles at two ends;
secondly, excavating a foundation trench between the two support piles;
thirdly, short upright columns at the fish belly are arranged in the foundation grooves and vertically arranged on a connecting middle line between the two supporting piles, the middle of each short upright column is the longest, the two sides of each short upright column are sequentially shortened, a part of pre-anchored steel bars extend out of the tops of the short upright columns and are conveniently connected with the cross beams into a whole, a stringing ring is arranged at the bottom of each short upright column, the unbonded steel strands sequentially pass through the stringing ring of the short upright columns, and the two ends of the unbonded steel strands are upwards arranged at the upper ends of the supporting piles to form a fish belly type prestressed bar structure;
backfilling the base groove;
binding a reinforcement cage with the cross beam and the bearing platform of the support pile, connecting each upright post with the cross beam through pre-anchored reinforcements, and enabling two ends of the unbonded steel strand to penetrate through the cross beam and the bearing platform and expose a part of the unbonded steel strand to facilitate tensioning of prestress;
sixthly, pouring concrete of the cross beam and bearing platforms at two ends, and pouring and connecting the cross beam, the bearing platforms and the short upright posts into a whole;
(VII) clamping the anchorage devices at the two ends of the unbonded steel strand;
(eighth) protecting the anchorage device.
The technical problem to be solved by the invention can be further realized by the following technical scheme that the short upright at the fish belly part at least comprises a middle upright and two side posts at two sides.
The technical problem to be solved by the invention can be further realized by the following technical scheme that the short upright posts and the two supporting posts at the fish belly are arranged at equal intervals.
Compared with the prior art, the fish-bellied large-span foundation beam adopts high-strength unbonded prestressed steel strands, short stand columns and reinforced concrete beams with different lengths to construct the variable-height large-span high-bearing-capacity foundation beam; the appearance is similar to the fish belly. The concrete beam and the terrace are integrally cast and axially pressed, so that the characteristic of excellent compression resistance and cost performance of the concrete is fully exerted, and the advantages of high-strength steel can be better exerted after the high-strength prestressed reinforcement is pulled; the unbonded prestressed tendon is adopted as a high-strength material, so that the technology is mature, and the anticorrosion is durable. The technical scheme provided by the invention has the advantages of extremely high cost performance, convenience and quickness in construction and high bearing capacity.
Drawings
FIG. 1 is a schematic diagram of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, and in order to make those skilled in the art understand the present invention further, the embodiments of the present invention will be described in detail and fully with reference to the accompanying drawings. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
A fish belly type foundation beam with large span and unbonded prestressed tendons,
the construction method comprises two end supporting piles 3, a middle cross beam 4 and an unbonded steel strand 1, and comprises the following specific construction methods:
firstly, driving support piles at two ends;
secondly, excavating a foundation trench between the two support piles;
thirdly, a short upright post 2 at the fish belly is arranged in the foundation trench, the short upright post is vertically arranged on a connecting middle line between the two supporting piles, the middle of the short upright post is the longest, two sides of the short upright post are sequentially shortened, a part of pre-anchored steel bar extends out of the top of the short upright post and is conveniently connected with the cross beam into a whole, a stringing ring is arranged at the bottom of the short upright post, the unbonded steel strand sequentially passes through the stringing ring of the short upright post, and two ends of the unbonded steel strand are upwards arranged at the upper ends of the supporting piles to form a fish belly type prestressed bar structure;
backfilling the base groove;
fifthly, binding a reinforcement cage with the cross beam and the supporting pile bearing platform 6, connecting each upright post with the cross beam through pre-anchored reinforcements, and enabling two ends of the unbonded steel strand to penetrate through the cross beam and the bearing platform and expose a part of the unbonded steel strand to facilitate tensioning of prestress;
sixthly, pouring concrete of the cross beam and bearing platforms at two ends, and pouring and connecting the cross beam, the bearing platforms and the short upright posts into a whole;
seventhly, clamping anchorage devices 5 at two ends of the unbonded steel strand;
(eighth) protecting the anchorage device.
The short upright post at the fish belly part at least comprises a middle upright post and two side posts. The short upright posts and the two supporting piles at the fish belly are arranged at equal intervals.
And (5) pouring terrace concrete. The terrace is the overhead ground: the foundation sinks along with the time, the terrace is suspended, and the overhead ground is formed: no moisture and alkali return, definite force transmission path and adjustable and controllable sedimentation.
The anchorage device and related materials of the unbonded steel strand are commercially mature products. The unbonded steel strand has high durability, is more suitable for coastal geological conditions, and has high corrosion resistance level. Because the sludge is deeply buried in the sludge, the sludge provides lateral support for the steel strands, and the lateral instability of the steel strands can be effectively prevented.
The stress of the bonded steel strand can be designed and conveniently adjusted according to the anti-cracking requirement of the structure and the bearing capacity requirement of the system, and the complete set of anchorage device facilitates the regulation and control of the prestress. After applying a suitable prestress, the anchoring is carried out.
The problem of uneven settlement of a large-area site under the thick-sea silt geological condition is very common, and the technical scheme provided by the invention has the advantages of high cost performance, convenience and quickness in construction and high bearing capacity.
The unbonded steel strand has high durability, is more suitable for coastal geological conditions, and facilitates the regulation and control of prestress; the stress of the unbonded steel strand can be designed according to the requirement of ground bearing capacity and is convenient to adjust; the problem of uneven settlement of a large-area field under the condition of deep sea silt geology is conveniently solved, and the cost performance is extremely high. The sludge is deeply buried in the sludge, so that the sludge provides lateral support for the steel strand, and the lateral instability of the steel strand can be effectively prevented; overhead ground: no moisture and alkali return, definite force transmission path and adjustable and controllable sedimentation.
Claims (3)
1. The utility model provides a fish belly formula foundation beam of large-span unbonded prestressing tendons which characterized in that:
the construction method comprises two end supporting piles, a middle cross beam and unbonded steel strands, and specifically comprises the following steps:
firstly, driving support piles at two ends;
secondly, excavating a foundation trench between the two support piles;
thirdly, short upright columns at the fish belly are arranged in the foundation grooves and vertically arranged on a connecting middle line between the two supporting piles, the middle of each short upright column is the longest, the two sides of each short upright column are sequentially shortened, a part of pre-anchored steel bars extend out of the tops of the short upright columns and are conveniently connected with the cross beams into a whole, a stringing ring is arranged at the bottom of each short upright column, the unbonded steel strands sequentially pass through the stringing ring of the short upright columns, and the two ends of the unbonded steel strands are upwards arranged at the upper ends of the supporting piles to form a fish belly type prestressed bar structure;
backfilling the base groove;
binding a reinforcement cage on the beam and the bearing platform of the support pile, connecting each upright post with the beam through pre-anchored steel bars, and enabling two ends of the unbonded steel strand to penetrate through the beam and the bearing platform and expose a part of the unbonded steel strand so as to facilitate tensioning of prestress;
sixthly, pouring concrete of the cross beam and bearing platforms at two ends, and pouring and connecting the cross beam, the bearing platforms and the short upright posts into a whole;
(VII) clamping the anchorage devices at the two ends of the unbonded steel strand;
and (eighthly), protecting the anchorage device.
2. The large span fish-bellied foundation beam without tendons of claim 1, wherein: the short upright post at the fish belly part at least comprises a middle upright post and two side posts.
3. The large span fish-bellied foundation beam without tendons of claim 1 or 2, wherein: the short upright posts and the two supporting piles at the fish belly are arranged at equal intervals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210486765.5A CN114737594A (en) | 2022-05-06 | 2022-05-06 | Large-span unbonded prestressed tendon's fish belly formula foundation beam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210486765.5A CN114737594A (en) | 2022-05-06 | 2022-05-06 | Large-span unbonded prestressed tendon's fish belly formula foundation beam |
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| Publication Number | Publication Date |
|---|---|
| CN114737594A true CN114737594A (en) | 2022-07-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210486765.5A Pending CN114737594A (en) | 2022-05-06 | 2022-05-06 | Large-span unbonded prestressed tendon's fish belly formula foundation beam |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201738496U (en) * | 2010-06-21 | 2011-02-09 | 浙江鸿翔建设集团有限公司 | Concrete beam string structure |
| CN102535502A (en) * | 2011-12-29 | 2012-07-04 | 中国一冶集团有限公司 | Method for preventing settling and cracking of terrace with large area by utilizing combined prestressing concrete beams at region with soft soil layer |
| CN102839675A (en) * | 2012-09-25 | 2012-12-26 | 上海新强劲工程技术有限公司 | Long-span pre-stress fish belly sill for foundation pit support and mounting method thereof |
| CN103981799A (en) * | 2014-05-29 | 2014-08-13 | 福州大学 | Steel tube concrete string stiffness beam and construction method thereof |
| CN105064195A (en) * | 2015-07-29 | 2015-11-18 | 广西交通科学研究院 | Internal prestress steel and concrete combined simply supported girder bridge of prefabricated and assembled fish-bellied corrugated steel web and construction method thereof |
| CN105569265A (en) * | 2015-12-25 | 2016-05-11 | 项剑锋 | Technology for reduction of beam section height by use of unbonded steel strand prestress |
| CN113463656A (en) * | 2021-07-02 | 2021-10-01 | 上海强劲地基工程股份有限公司 | Steel pipe and fish-belly sill combination formula underground structure |
| CN113529746A (en) * | 2021-08-26 | 2021-10-22 | 中冶建筑研究总院（深圳）有限公司 | Recyclable prestress supporting system and construction method |
-
2022
- 2022-05-06 CN CN202210486765.5A patent/CN114737594A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201738496U (en) * | 2010-06-21 | 2011-02-09 | 浙江鸿翔建设集团有限公司 | Concrete beam string structure |
| CN102535502A (en) * | 2011-12-29 | 2012-07-04 | 中国一冶集团有限公司 | Method for preventing settling and cracking of terrace with large area by utilizing combined prestressing concrete beams at region with soft soil layer |
| CN102839675A (en) * | 2012-09-25 | 2012-12-26 | 上海新强劲工程技术有限公司 | Long-span pre-stress fish belly sill for foundation pit support and mounting method thereof |
| CN103981799A (en) * | 2014-05-29 | 2014-08-13 | 福州大学 | Steel tube concrete string stiffness beam and construction method thereof |
| CN105064195A (en) * | 2015-07-29 | 2015-11-18 | 广西交通科学研究院 | Internal prestress steel and concrete combined simply supported girder bridge of prefabricated and assembled fish-bellied corrugated steel web and construction method thereof |
| CN105569265A (en) * | 2015-12-25 | 2016-05-11 | 项剑锋 | Technology for reduction of beam section height by use of unbonded steel strand prestress |
| CN113463656A (en) * | 2021-07-02 | 2021-10-01 | 上海强劲地基工程股份有限公司 | Steel pipe and fish-belly sill combination formula underground structure |
| CN113529746A (en) * | 2021-08-26 | 2021-10-22 | 中冶建筑研究总院（深圳）有限公司 | Recyclable prestress supporting system and construction method |
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