CN111139976A - Large-size bracket reinforcement structure - Google Patents
Large-size bracket reinforcement structure Download PDFInfo
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- CN111139976A CN111139976A CN202010060789.5A CN202010060789A CN111139976A CN 111139976 A CN111139976 A CN 111139976A CN 202010060789 A CN202010060789 A CN 202010060789A CN 111139976 A CN111139976 A CN 111139976A
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- 230000002787 reinforcement Effects 0.000 title claims abstract description 33
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 65
- 239000010959 steel Substances 0.000 claims abstract description 65
- 238000010276 construction Methods 0.000 claims abstract description 24
- 238000005452 bending Methods 0.000 claims abstract description 15
- 230000003014 reinforcing effect Effects 0.000 claims description 10
- 229910000746 Structural steel Inorganic materials 0.000 claims description 5
- 238000009415 formwork Methods 0.000 claims 1
- 238000011144 upstream manufacturing Methods 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
- E04C5/02—Reinforcing elements of metal, e.g. with non-structural coatings of low bending resistance
- E04C5/03—Reinforcing elements of metal, e.g. with non-structural coatings of low bending resistance with indentations, projections, ribs, or the like, for augmenting the adherence to the concrete
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/30—Columns; Pillars; Struts
- E04C3/34—Columns; Pillars; Struts of concrete other stone-like material, with or without permanent form elements, with or without internal or external reinforcement, e.g. metal coverings
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Reinforcement Elements For Buildings (AREA)
Abstract
The invention discloses a large-volume bracket reinforcement structure, which comprises a large-volume bracket positioned at the upstream of a wall body, wherein the large-volume bracket is formed by mixing and pouring concrete and various reinforcement bars, the reinforcement bars comprise longitudinal horizontal tension steel bars and bending steel bars which are positioned at the outer edge of the outline of the large-volume bracket and are arranged in parallel in a horizontal multi-row mode, longitudinal construction steel bars which are vertically arranged with the longitudinal horizontal tension steel bars and the bending steel bars and are parallel to each other, and horizontal stirrups which are positioned inside the large-volume bracket and are arranged in multiple layers in the longitudinal and vertical directions; the horizontal stirrups adopt HRB 400-grade steel bars, the diameter is 20-25 mm, and the vertical and longitudinal intervals between every two adjacent horizontal stirrups are 1000-1500 mm. By optimizing the reinforcement parameters in the structure, the construction investment is saved, the construction is convenient, and the structure is safe and reliable, so that the aim of economic rationality is fulfilled.
Description
Technical Field
The invention relates to a large-size bracket reinforcement structure, and belongs to the technical field of hydraulic and hydroelectric engineering. .
Background
In recent years, the water conservancy and hydropower industry in China is changed day by day, the engineering scale is continuously enlarged, and due to the structural arrangement requirement, some hydraulic buildings inevitably have cantilever structures with long span and large section size, large-size corbels are common types, and the structural reinforcement arrangement is also a serious difficulty in engineering technical research. Firstly, for large-volume corbels with small load action, structural reinforcement is calculated according to the design specification of hydraulic concrete structure (DL/T5057-2009, hereinafter referred to as the specification), the area of longitudinal horizontal tensioned steel reinforcement obtained by calculation is very small, even if reinforcement is arranged according to the minimum reinforcement ratio, the steel reinforcement diameter is very large, the space is very dense, the processing and installation of the steel reinforcement are difficult, the pouring and blanking construction and the vibration compaction of concrete are also influenced, and the safety of the structure can be influenced if the technical problems are not properly treated. Secondly, the current specification specifies that the bracket should be provided with horizontal stirrups, the steel bars should be HRB 335-grade steel bars, the diameter should not be less than 8mm, the vertical spacing should not be greater than 150mm, the horizontal spacing along the longitudinal direction of the bracket should not be greater than 300mm, and the total cross-sectional area of the horizontal stirrups in the effective height range of the upper 2/3 bracket should not be less than 1/2 of the cross-sectional area of the tensioned steel bars bearing vertical force or the reinforcement distribution rate should not be less than 0.15%. The execution according to the standard can cause the arrangement of the reinforcing steel bars in the bracket to be extremely dense, and the pouring construction quality of the concrete is influenced.
Practice proves that in the design of the reinforcing bars of the large-volume bracket structure, calculation and selection of longitudinal horizontal tension steel bars, arrangement of horizontal stirrups, construction quality and safety control of concrete are three main factors influencing design and construction, and the problem is worthy of deep research.
Disclosure of Invention
The invention aims to provide a large-volume corbel reinforcement structure. By optimizing the reinforcement parameters in the structure, the construction investment is saved, the construction is convenient, and the structure is safe and reliable, so that the aim of economic rationality is fulfilled.
The technical scheme of the invention is as follows: a large-size bracket reinforcement structure comprises a large-size bracket positioned at the upstream of a wall body, wherein the large-size bracket is formed by pouring concrete and various reinforcement in a mixed manner, the reinforcement comprises longitudinal horizontal tension steel bars and bending steel bars which are positioned at the outer edge of the outline of the large-size bracket and are arranged in parallel in a horizontal multi-row manner, longitudinal construction steel bars which are vertically arranged with the longitudinal horizontal tension steel bars and the bending steel bars and are mutually parallel, and horizontal stirrups which are positioned inside the large-size bracket and are arranged in multiple layers in the longitudinal and vertical directions along the horizontal direction; the horizontal stirrups adopt HRB 400-grade steel bars, the diameter is 20-25 mm, and the vertical and longitudinal intervals between every two adjacent horizontal stirrups are 1000-1500 mm.
In the large-volume bracket reinforcement structure, the longitudinal horizontal tension steel bars, the bending steel bars and the longitudinal structural steel bars are HRB 400-grade steel bars, the diameter of the HRB 400-grade steel bars is 20-36 mm, and 5-8 steel bars are arranged per meter.
The invention has the beneficial effects that: compared with the prior art, the invention can save the engineering investment, facilitate the construction, and be safe and reliable by optimizing the parameters of the horizontal stirrup, the longitudinal horizontal tension steel bar, the bending steel bar and the longitudinal structural steel bar of the bracket with the reasonable cross section size and large volume, thereby achieving the purpose of economic rationality and being widely popularized and applied in the technical field of water conservancy and hydropower engineering. This scheme has been applied to in the big volume bracket structure arrangement of reinforcement structure of Tibet bent fruit many hydropower station diversion power generation system water inlet, adopts this kind of structure, has both satisfied the requirement of the reasonable big volume bracket structure bearing capacity design of cross-sectional dimension, and convenient construction again and saving investment have reached economic rationality's purpose, have gained good effect.
Drawings
FIG. 1 is a schematic cross-sectional view of the structure of the present invention;
FIG. 2 is a sectional view taken along line A-A of FIG. 1;
FIG. 3 is a schematic structural view of a horizontal stirrup;
FIG. 4 is a schematic view showing a structure of a longitudinal horizontal tension bar;
FIG. 5 is a schematic view of the structure of a bent steel bar;
fig. 6 is a schematic view of the structure of the longitudinally constructed reinforcing bar.
Reference numerals: 1-large-volume bracket, 2-wall, 3-longitudinal structural steel bar, 4-longitudinal horizontal tension steel bar, 5-bending steel bar and 6-horizontal stirrup.
Detailed Description
The invention is further illustrated by the following figures and examples, which are not to be construed as limiting the invention.
The embodiment of the invention comprises the following steps: a large-volume bracket reinforcement structure is disclosed, as shown in the attached figures 1-6, comprising a large-volume bracket 1 positioned at the upstream of a wall body 2, wherein the large-volume bracket 1 is formed by pouring concrete and various reinforcement in a mixing way, the reinforcement comprises longitudinal horizontal tension steel bars 4 and bending steel bars 5 positioned at the outer edge of the outline of the large-volume bracket 1, the longitudinal horizontal tension steel bars 4 and the bending steel bars 5 are arranged in parallel in horizontal rows, the reinforcement further comprises longitudinal construction steel bars 3 vertically arranged with the longitudinal horizontal tension steel bars 4 and the bending steel bars 5, the longitudinal construction steel bars 3 are distribution steel bars of the longitudinal horizontal tension steel bars 4 and the bending steel bars 5, the longitudinal construction steel bars 3 are also arranged in parallel in vertical rows, the reinforcement further comprises horizontal stirrups 6 positioned inside the large-volume bracket 1 and arranged in the horizontal direction, the horizontal stirrups 6 are arranged in multiple rows along the longitudinal direction and are arranged in a multilayer structure along the vertical direction, horizontal stirrup 6 adopts HRB400 level reinforcing bar, and the diameter is 20 ~ 25mm, and vertical, fore-and-aft interval is 1000 ~ 1500mm between adjacent horizontal stirrup 6.
The longitudinal horizontal tension steel bars 4, the bending steel bars 5 and the longitudinal structural steel bars 3 are HRB 400-grade steel bars, the diameter of the HRB 400-grade steel bars is 20-36 mm, and 5-8 steel bars are arranged per meter.
The invention is realized by the following technical scheme.
The replacement of the horizontal stirrups 6 and the construction quality and safety control of concrete are carried out by calculating and selecting the longitudinal horizontal tension steel bars 4 of the large-volume bracket 1 with reasonable section size and the design value of bearing capacity, namely, the height of the rising layer of the large-volume bracket 1 during pouring is not more than 2m, the height of the layer of the first-bin concrete at the bottom is not more than 1m during pouring, and the upper structure can be continuously poured after the strength of the first-bin concrete reaches 75% of the design age. After the large-volume corbel 1 concrete is poured on the top surface, when the concrete reaches 28 days of design strength, the supporting template can be detached, and a construction organization scheme is formulated by a construction unit and approved by a supervision unit. The method has the advantages that the method can optimize reinforcement parameters, enhance construction quality control, save engineering investment, facilitate construction, and achieve the purposes of economy and rationality by deep research in several aspects.
Namely, the section size of a large-volume bracket 1 positioned at the upstream of a wall body 2 is firstly regulated to be P in specification169And (4) checking the crack control condition of the section 13.8.1, and if the crack control condition is not met, readjusting until the crack control condition meets the requirements.
Then the vertical concentrated force load acting on the top of the large-volume bracket 1 is combined, and the standard middle P is adopted171～17313.8.2 th ～3, the longitudinal horizontal tension steel bar 4 of the bracket 1 with large volume is calculated and analyzed by chapter and essay, and a finite element stress graph method is used according to the specification P221Appendix D chapter clause for relevant checking.
And finally, considering the existence of external adverse factors and structural safety reserves, suggesting that the reinforcement area of the longitudinal horizontal tension steel bar 4 is not less than 2/3 times of the minimum reinforcement ratio and meets the reinforcement area of the longitudinal horizontal tension steel bar 4 determined by a standard calculation method and a finite element method. The horizontal stirrup 6 adopts HRB 400-grade steel bar with the diameter of 20～25mm, and the vertical and horizontal spacing are both 1000～1500mm, diameter, interval can combine bracket scale and engineering characteristics to adjust, and the total cross sectional area of horizontal stirrup 6 should carry out the reinforcing bar according to the principle that the reinforcing bar bearing capacity design value equals and replaces, replaces the lower one-level reinforcing bar with higher one-level reinforcing bar promptly, corresponding increase stirrup diameter and increase stirrup interval simultaneously.
The reinforcing parameters of the longitudinal horizontal tension steel bar 4, the bending steel bar 5 (if necessary), the horizontal stirrup 6 and the longitudinal construction steel bar 3 are convenient for construction. The construction quality and safety control related requirements are made, namely the height of the lifting layer is not more than 2m when the large-volume bracket 1 is poured, the height of the lifting layer is not more than 1m when the first-bin concrete at the bottom is poured, and meanwhile, the superstructure can be continuously poured after the strength of the first-bin concrete reaches 75% of the design age.
Claims (2)
1. The utility model provides a bulky bracket reinforcement structure which characterized in that: the large-size corbel formwork comprises a large-size corbel (1) positioned on the upper stream of a wall body (2), wherein the large-size corbel (1) is formed by pouring concrete and various reinforcing bars in a mixed mode, the reinforcing bars comprise longitudinal horizontal tension steel bars (4) and bending steel bars (5) which are positioned on the outer edge of the outline of the large-size corbel (1) in horizontal rows and are arranged in parallel, longitudinal construction steel bars (3) which are vertically arranged with the longitudinal horizontal tension steel bars (4) and the bending steel bars (5) and are parallel to each other, and horizontal stirrups (6) which are positioned inside the large-size corbel (1) and are arranged in a longitudinal and vertical multi-layer mode along the horizontal direction; the horizontal stirrups (6) adopt HRB 400-grade steel bars, the diameter is 20-25 mm, and the vertical and longitudinal intervals between every two adjacent horizontal stirrups (6) are 1000-1500 mm.
2. The high-volume corbel reinforcement structure according to claim 1, wherein: the longitudinal horizontal tension steel bars (4), the bent steel bars (5) and the longitudinal structural steel bars (3) are HRB 400-grade steel bars, the diameter of the HRB 400-grade steel bars is 20-36 mm, and 5-8 steel bars are arranged per meter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010060789.5A CN111139976A (en) | 2020-01-19 | 2020-01-19 | Large-size bracket reinforcement structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010060789.5A CN111139976A (en) | 2020-01-19 | 2020-01-19 | Large-size bracket reinforcement structure |
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| CN111139976A true CN111139976A (en) | 2020-05-12 |
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| CN202010060789.5A Pending CN111139976A (en) | 2020-01-19 | 2020-01-19 | Large-size bracket reinforcement structure |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1827976A (en) * | 2006-03-30 | 2006-09-06 | 建研科技股份有限公司 | Steel bar anchoring device and construction method thereof |
| CN101029503A (en) * | 2007-04-06 | 2007-09-05 | 北京工业大学 | Beam and pile assembled node of precast and prestressed concrete structure |
| CN203080955U (en) * | 2012-09-18 | 2013-07-24 | 贵阳铝镁设计研究院有限公司 | Structure for adding corbels on reinforced concrete column |
| CN204023518U (en) * | 2014-06-26 | 2014-12-17 | 中国电建集团贵阳勘测设计研究院有限公司 | A kind of arch dam table hole Segment gate bearing and top of arch dam tie-beam integrated structure |
| CN207538200U (en) * | 2017-11-29 | 2018-06-26 | 中国能源建设集团辽宁电力勘测设计院有限公司 | A kind of Reinforced Concrete Corbels |
| CN108625278A (en) * | 2018-05-22 | 2018-10-09 | 信阳师范学院 | A kind of hollow slab bridge hinge seam connector and its stress checking calculation method |
| CN212001927U (en) * | 2020-01-19 | 2020-11-24 | 中国电建集团贵阳勘测设计研究院有限公司 | Large-size bracket reinforcement structure |
-
2020
- 2020-01-19 CN CN202010060789.5A patent/CN111139976A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1827976A (en) * | 2006-03-30 | 2006-09-06 | 建研科技股份有限公司 | Steel bar anchoring device and construction method thereof |
| CN101029503A (en) * | 2007-04-06 | 2007-09-05 | 北京工业大学 | Beam and pile assembled node of precast and prestressed concrete structure |
| CN203080955U (en) * | 2012-09-18 | 2013-07-24 | 贵阳铝镁设计研究院有限公司 | Structure for adding corbels on reinforced concrete column |
| CN204023518U (en) * | 2014-06-26 | 2014-12-17 | 中国电建集团贵阳勘测设计研究院有限公司 | A kind of arch dam table hole Segment gate bearing and top of arch dam tie-beam integrated structure |
| CN207538200U (en) * | 2017-11-29 | 2018-06-26 | 中国能源建设集团辽宁电力勘测设计院有限公司 | A kind of Reinforced Concrete Corbels |
| CN108625278A (en) * | 2018-05-22 | 2018-10-09 | 信阳师范学院 | A kind of hollow slab bridge hinge seam connector and its stress checking calculation method |
| CN212001927U (en) * | 2020-01-19 | 2020-11-24 | 中国电建集团贵阳勘测设计研究院有限公司 | Large-size bracket reinforcement structure |
Non-Patent Citations (1)
| Title |
|---|
| 郭华;: "混凝土牛腿开裂的工程处理浅析", 中华民居, no. 07, 10 July 2011 (2011-07-10) * |
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