CN108060634A - Duplexing font ultra-high performance concrete-normal concrete composite beam bridge girder construction and its construction method - Google Patents

Duplexing font ultra-high performance concrete-normal concrete composite beam bridge girder construction and its construction method Download PDF

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Publication number
CN108060634A
CN108060634A CN201711259066.2A CN201711259066A CN108060634A CN 108060634 A CN108060634 A CN 108060634A CN 201711259066 A CN201711259066 A CN 201711259066A CN 108060634 A CN108060634 A CN 108060634A
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China
Prior art keywords
font
bridge
duplexing
ultra
high performance
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CN201711259066.2A
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Chinese (zh)
Inventor
赵华
邵旭东
涂磊
李昭
邱明红
胡俊德
李�杰
杜铁
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Hunan University
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Hunan University
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Priority to CN201711259066.2A priority Critical patent/CN108060634A/en
Publication of CN108060634A publication Critical patent/CN108060634A/en
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    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D2/00Bridges characterised by the cross-section of their bearing spanning structure
    • E01D2/02Bridges characterised by the cross-section of their bearing spanning structure of the I-girder type
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D21/00Methods or apparatus specially adapted for erecting or assembling bridges
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D2101/00Material constitution of bridges
    • E01D2101/20Concrete, stone or stone-like material
    • E01D2101/24Concrete
    • E01D2101/26Concrete reinforced
    • E01D2101/28Concrete reinforced prestressed

Abstract

The invention discloses a kind of duplexing font ultra-high performance concrete normal concrete composite beam bridge girder construction and its construction methods, the duplex font ultra-high performance concrete normal concrete composite beam bridge girder construction includes duplexing font beam element and floorings, floorings are fixed in above duplexing font beam element, duplexing font beam element is integral prefabricated using ultra-high performance concrete material, and floorings are cast-in-place above duplexing font beam element using normal concrete.Duplex font ultra-high performance concrete normal concrete composite beam bridge girder construction disclosed by the invention have many advantages, such as dead weight compared with it is light, durability is good, can effectively reduce beam cracks width, construction method is simple for process, easy to operate, speed of application soon, good economy performance.

Description

Duplexing font ultra-high performance concrete-normal concrete composite beam bridge girder construction and its Construction method
Technical field
The present invention relates to bridge member, bridge structure and its construction more particularly to a kind of prefabricated duplexing font very-high performances Concrete-normal concrete composite beam bridge girder construction and its construction method.
Background technology
Precast prestressed concrete beam have simple in structure, stress is clear and definite, it is cheap, environmentally protective, set up facilitate etc. it is excellent Point, is widely used in bridge structure.
In 20m into 60m across footpath bridges, main section form is T-shaped, independent I-shaped and box-shaped, wherein prefabricated T Shape, independent i-shaped roof beam easily generate in erection, hoisting process to topple, and the prefabricated unit quantity of these bridges is more, applies Splicing accuracy is difficult to control during work;Prefabricated subsection box beam the number of components is excessive in prefabricated box-girder, and working procedure is complicated, and The weight of box girder is big, and transport, lifting are difficult.Also, the prefabricated unit quantity of these above-mentioned bridges is more, is spelled in work progress Dress precision is difficult to control.
The content of the invention
Problem to be solved by this invention is to overcome the shortcomings of to mention in background above technology and defect, provide it is a kind of from Weight compared with it is light, durability is good, can effectively reduce duplexing font ultra-high performance concrete-normal concrete combination of beam cracks width Beam bridge girder construction, correspondingly provides that a kind of simple for process, easy to operate, speed of application is fast, the duplexing font superelevation of good economy performance The construction method of performance concrete-normal concrete composite beam bridge girder construction.
In order to solve the above technical problems, technical solution proposed by the present invention for it is a kind of can be applied to it is prefabricated in bridge structure Duplexing font ultra-high performance concrete-normal concrete composite beam bridge girder construction:
A kind of duplex font ultra-high performance concrete-normal concrete composite beam bridge girder construction, including duplexing font beam element and Floorings, the floorings are fixed in above duplexing font beam element, and the duplex font beam element uses very-high performance coagulation Soil material is integral prefabricated, and the floorings are cast-in-place above duplexing font beam element using normal concrete.
The above-mentioned technical proposal of the present invention is innovatively by normal concrete(NC)And ultra-high performance concrete(UHPC)Two Kind combination of materials applies in the bridge structure of duplexing font beam element, since the tensile strength of NC materials is low, shrinkage and creep is big, Beam cracks can be developed under the long term of the factors such as vehicular load, and wet seam crossing armored concrete can crack, resistance to Long performance substantially reduces, but NC materials are conveniently easy to get and cost is relatively low, pass through the united application NC and UHPC two in bridge structure Kind material can not only make full use of the advantage of existing NC materials, but also using high elastic modulus, highly resistance possessed by UHPC The advantages that pressure, tensile strength and low Creep Characteristics, in conjunction with the main beam structure of duplexing font beam element, bridge can be greatly reduced Structure size mitigates bridge structure dead weight, effectively improves validity and durability that structure resists load.
In above-mentioned duplexing font ultra-high performance concrete-normal concrete composite beam bridge girder construction, preferably:It is described double I-shaped roof beam unit includes i-shaped roof beam two panels along bridge Longitudinal extending, and two panels i-shaped roof beam is mutually parallel, the duplex word The end of ellbeam unit is equipped with end diaphragm plate, and middle part is equipped with middle diaphragm plate at least together.End diaphragm plate is set with middle diaphragm plate It puts and two panels i-shaped roof beam links into an integrated entity, make duplexing font beam element entirety stress more preferable.
Above-mentioned duplexing font ultra-high performance concrete-normal concrete composite beam bridge girder construction, preferably:The end is horizontal The height of partition plate is identical and concordant with i-shaped roof beam with i-shaped roof beam, and the width of the end diaphragm plate is more than two panels i-shaped roof beam Spacing simultaneously extends to the both sides of duplexing font beam element.It is same with beam to be placed in the end set of the duplexing font beam element on bridge pier High end diaphragm plate so that duplexing font beam element is not easy to topple in lifting, erection, ensure that the stability of beam.
Above-mentioned duplexing font ultra-high performance concrete-normal concrete composite beam bridge girder construction, preferably:Wherein the middle cross The height of partition plate is less than I-shaped depth of beam, and middle diaphragm plate is arranged among two panels i-shaped roof beam and is fixed in i-shaped roof beam On floorings.End diaphragm plate is placed on bridge pier together with beam-ends, is advantageously ensured that the stability of beam, is unlikely to topple.
Above-mentioned duplexing font ultra-high performance concrete-normal concrete composite beam bridge girder construction, preferably:It is each described Duplexing font beam element in the quantity of middle diaphragm plate that sets be 1-9, and multiple middle diaphragm plates are along duplexing font beam element Longitudinal direction uniformly arrangement.
Above-mentioned duplexing font ultra-high performance concrete-normal concrete composite beam bridge girder construction, preferably:Described in composition The duplexing font beam element of bridge structure is multiple, and the multiple duplex font beam element is spliced along bridge lateral, horizontal Connection reinforcing bar to adjacent two duplexing font beam elements is attached in the wet seam of end diaphragm plate, the wet seam By normal concrete cast in situs.
Above-mentioned duplexing font ultra-high performance concrete-normal concrete composite beam bridge girder construction, preferably:The bridge Structure sets up the multispan structure of multiple prefabricated U HPC duplexs font beam elements, each prefabricated U HPC duplexs font beam element for longitudinal direction Be made of at least one duplexing font beam element set laterally side by side, the single prefabricated U HPC duplexs font beam element across It spends for 20m ~ 60m.The bridge structure of multiple prefabricated U HPC duplex fonts beam elements composition can be freely supported structure or bridge floor it is continuous, Girder freely supported structure or bridge floor are continuous, girder continuous structure, and the model of process calculates, and the bridge single span across footpath is preferably 20m ~60m.
Above-mentioned duplexing font ultra-high performance concrete-normal concrete composite beam bridge girder construction, preferably:The I-shaped Ellbeam includes top flange, lower flange and web, the i-shaped roof beam rise-span ratio~, the width of web for 0.10m ~ 0.25m, the width of top flange are 0.18m ~ 0.55m, and the width of lower flange is 0.45m ~ 1.0m, between the transverse direction of two panels i-shaped roof beam It is 0.12m ~ 0.30m away from the panel thickness for 1.2m ~ 3.0m, the floorings.These size ranges, reasonable stress, economy, It is easy for construction.
The present invention also provides a kind of above-mentioned duplexing font ultra-high performance concrete-normal concrete composite beam bridge girder constructions Construction method, comprise the following steps:
(a)In factory or scene using the integral prefabricated duplexing font beam element of ultra-high performance concrete;
(b)Laterally assembled prefabricated duplexing font beam element obtains the prefabricated U HPC duplex tee beam lists of single span at the construction field (site) Member, if multispan structure, it is necessary to longitudinally set up multiple prefabricated U HPC duplexs font beam elements;
(c1)If freely supported structure, in the wet seam crossing connection of the end diaphragm plate of adjacent two prefabricated duplexing font beam elements, indulge Without concreting between girder, normal concrete floorings are first poured, leaves and stretches between adjacent longitudinal floorings Contracting seam, is then conserved;
(c2)If bridge floor is continuous, girder freely supported structure, adjacent two prefabricated duplexing font beam elements end diaphragm plate it is wet Seam crossing connects, and pours normal concrete floorings without concreting, whole bridge between longitudinal girder, is conserved;
(c3)If bridge floor is continuous, girder continuous structure, adjacent two prefabricated duplexing font beam elements end diaphragm plate it is wet Seam crossing connects, and the longitudinal wet joint between longitudinal girder is poured with normal concrete makes girder continuous, then whole bridge pours continuously Normal concrete floorings, are conserved;
(d)Complete the construction of deck paving and appurtenant work.Compared with prior art, the advantage of the invention is that:
First, prefabricated duplexing font beam element provided by the invention employs new material UHPC, common compared to existing frequently-used Concrete and high-performance concrete material, different-grain diameter particle forms closestpacking with optimal proportion in the composition material of UHPC So that its bending and tensile strength is up to more than 20MPa, it not only can be by reducing structure size, mitigating dead load using this material Come realize the lightness of girder, mitigate substructure quantities, improve bridge span ability, make the prefabricated, assembled of structure It is more prone to transport, and later stage after high-temperature steam curing shrinks substantially zeroed, and the later stage creeps also very little, this causes the present invention There are enough guarantees in terms of prefabricated beam body cracking is reduced;Floorings are primarily subjected to pressure, using the strong NC materials of anti-pressure ability Not only meet intensity requirement but also more economical.
Second, present invention employs duplexing font beam elements, and the duplexing font beam element structure that the present invention uses lifts, frame If when be not easy to topple, prefabricated unit quantity is few, ensure that the quality in the installation process of beam.
3rd, the present invention is reduced using duplexing font beam element compared to existing bridge scene seam, is not only easy to apply Work, and because the less durability for enhancing bridge structure of seam.
Description of the drawings
It in order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is the present invention Some embodiments, for those of ordinary skill in the art, without creative efforts, can also basis These attached drawings obtain other attached drawings.
Fig. 1 is the front view of single span duplex font UHPC-NC composite beam bridge bridge structures in the embodiment of the present invention.
Fig. 2 be the embodiment of the present invention in, multispan duplex font UHPC-NC composite beam bridges, freely supported structure beam bridge front view.
Fig. 3 is in the embodiment of the present invention, and multispan duplex font UHPC-NC composite beam bridges, bridge floor is continuous, girder simply supported beam Bridge front view.
Fig. 4 is in the embodiment of the present invention, and multispan duplex font UHPC-NC composite beam bridges, bridge floor is continuous, girder continuous beam Bridge front view.
Fig. 5 is the section view enlarged diagram at A-A in Fig. 1.
Fig. 6 is the section view enlarged diagram at B-B in Fig. 1.
Fig. 7 is the section view enlarged diagram at C-C in Fig. 1.
Fig. 8 is the sectional view of end cross-sectional.
Marginal data:1. duplexing font beam element;2. floorings;3. i-shaped roof beam;31. top flange;32. lower flange;33. Web;4. end diaphragm plate;Diaphragm plate in 5.;6. wet seam;7. longitudinal wet joint;8. expansion joint.
Specific embodiment
For the ease of understanding the present invention, done more entirely below in conjunction with Figure of description and preferred embodiment to inventing herein Face meticulously describes, but protection scope of the present invention is not limited to specific examples below.
Unless otherwise defined, all technical terms used hereinafter are generally understood meaning phase with those skilled in the art Together.Technical term used herein is intended merely to the purpose of description specific embodiment, is not intended to the limitation present invention's Protection domain.
Unless otherwise specified, various raw material, reagent, the instrument and equipment etc. used in the present invention can pass through city Field is commercially available or can be prepared by existing method.
Embodiment:
A kind of such as Fig. 1, Fig. 5-duplexing font ultra-high performance concrete-normal concrete composite beam bridge girder construction shown in Fig. 7, bag Duplexing font beam element 1 and floorings 2 are included, floorings 2 are fixed in duplexing 1 top of font beam element, and duplexing font beam element 1 is Integral prefabricated using ultra-high performance concrete material, floorings 2 are cast-in-place on duplexing font beam element 1 using normal concrete Side.As shown in Figure 5-Figure 7, duplexing font beam element 1 includes the i-shaped roof beam 3 two panels along bridge Longitudinal extending, and two panels is I-shaped Beam 3 is mutually parallel, and the end of duplexing font beam element 1 is equipped with end diaphragm plate 4, and middle part is equipped with middle diaphragm plate 5 at least together.
As shown in figure 5, the height of end diaphragm plate 4 is identical with i-shaped roof beam 3 and concordant with i-shaped roof beam 3, end diaphragm plate 4 Width is more than the spacing of two panels i-shaped roof beam 3 and extends to the both sides of duplexing font beam element 1.
As shown in fig. 6, the height of middle diaphragm plate 5 is less than the height of i-shaped roof beam 3, and middle diaphragm plate 5 is arranged in two panels work Among tee beam 3 and it is fixed on i-shaped roof beam 3 and floorings 2.
As shown in fig. 7, the quantity of the middle diaphragm plate 5 set in each duplex font beam element 1 is 1-9, and it is multiple in Diaphragm plate 5 is uniformly arranged along duplexing 1 longitudinal direction of font beam element.
As shown in figure 8, the duplexing font beam element 1 of composition bridge structure is two, two duplexing font beam elements 1 are edges Bridge lateral is spliced, and the connection reinforcing bar of laterally adjacent two duplexing font beam elements 1 is the wet seam in end diaphragm plate 4 It is attached in 6, wet seam 6 is by normal concrete cast in situs.
As shown in Figure 5-Figure 7, the i-shaped roof beam 3 in the present embodiment includes top flange 31, lower flange 32 and web 33, I-shaped The rise-span ratio of shape 3, the width of web 33 is 0.12m, and the width of top flange 31 is 0.20m, and the width of lower flange 32 is 0.80m, the horizontal spacing of two panels i-shaped roof beam 3 is 1.6m, and the panel thickness of floorings 2 is 0.16m.
As shown in Figure 2, Figure 3, Figure 4, the bridge structure of the present embodiment can also be that longitudinal direction sets up multiple prefabricated U HPC duplexs The multispan structure of font beam element, each prefabricated U HPC duplex font beam elements are by least one duplexing word for setting laterally side by side Ellbeam unit 1 forms, and the span of single prefabricated U HPC duplexs font beam element is 20m ~ 60m.Each duplex font beam element End diaphragm plate and the setting of middle diaphragm plate are identical with the duplexing font beam element in Fig. 1, and cross-sectional view can be found in Fig. 5-Fig. 7.
The construction party of the duplexing font ultra-high performance concrete-normal concrete composite beam bridge girder construction of above-mentioned the present embodiment Method comprises the following steps:
(a)In factory or scene using the integral prefabricated duplexing font beam element 1 of ultra-high performance concrete;
(b)Laterally assembled prefabricated duplexing font beam element 1 obtains the prefabricated U HPC duplex tee beams of single span at the construction field (site) Unit, if multispan structure, it is necessary to longitudinally set up multiple prefabricated U HPC duplexs font beam elements;
(c)1. if freely supported structure, connect at the wet seam 6 of the end diaphragm plate 4 of adjacent two prefabricated duplexing font beam elements 1 Connect, without concreting between longitudinal girder, point across pouring normal concrete floorings 2, adjacent longitudinal floorings 2 it Between leave expansion joint 8, then conserved(Referring to Fig. 2);
2. if bridge floor is continuous, girder freely supported structure, adjacent two prefabricated duplexing font beam elements 1 end diaphragm plate 4 it is wet It is connected at seam 6, pours normal concrete floorings 2 without concreting, whole bridge between longitudinal girder, conserved (Referring to Fig. 3);
3. if bridge floor is continuous, girder continuous structure, adjacent two prefabricated duplexing font beam elements 1 end diaphragm plate 4 it is wet It is connected at seam 6, the longitudinal wet joint 7 between longitudinal girder is poured with normal concrete makes girder continuous, then whole bridge pours company Continuous normal concrete floorings 2, are conserved(Referring to Fig. 4);
(d)Complete the construction of deck paving and appurtenant work.

Claims (9)

1. a kind of duplex font ultra-high performance concrete-normal concrete composite beam bridge girder construction, including duplexing font beam element (1)And floorings(2), the floorings(2)It is fixed in duplexing font beam element(1)Top, it is characterised in that:The duplex word Ellbeam unit(1)It is integral prefabricated using ultra-high performance concrete material, the floorings(2)It is cast-in-place in double using normal concrete I-shaped roof beam unit(1)Top.
2. duplex font ultra-high performance concrete-normal concrete composite beam bridge girder construction according to claim 1, special Sign is:The duplex font beam element(1)Including two panels the i-shaped roof beam (3) along bridge Longitudinal extending, two panels i-shaped roof beam (3) it is mutually parallel, the duplex font beam element(1)End be equipped with end diaphragm plate(4), middle part is equipped with middle horizontal stroke at least together Partition plate(5).
3. duplex font ultra-high performance concrete-normal concrete composite beam bridge girder construction according to claim 2, special Sign is:The end diaphragm plate(4)Height and i-shaped roof beam(3)Identical and and i-shaped roof beam(3)Concordantly, the end diaphragm plate (4)Width be more than two panels i-shaped roof beam(3)Spacing and to duplexing font beam element(1)Both sides extension.
4. duplex font ultra-high performance concrete-normal concrete composite beam bridge girder construction according to claim 2, special Sign is:Wherein the middle cross partition plate(5)Height be less than i-shaped roof beam(3)Height, and middle diaphragm plate(5)It is arranged in two panels I-shaped Ellbeam(3)Centre is simultaneously fixed in i-shaped roof beam(3)And floorings(2)On.
5. duplex font ultra-high performance concrete-normal concrete composite beam bridge girder construction according to claim 2, special Sign is:Each duplexing font beam element(1)The middle diaphragm plate of middle setting(5)Quantity be 1-9, and it is multiple in Diaphragm plate(5)Along duplexing font beam element(1)Longitudinal direction uniformly arrangement.
6. duplexing font ultra-high performance concrete-normal concrete composite beam bridge according to any one of claim 1-5 Girder construction, it is characterised in that:Form the duplexing font beam element of the bridge structure(1)To be multiple, the multiple duplex font Beam element(1)It is to be spliced along bridge lateral, laterally adjacent two duplexing font beam elements(1)Connection reinforcing bar be to hold Diaphragm plate(4)Wet seam(6)In be attached, the wet seam(6)By normal concrete cast in situs.
7. duplexing font ultra-high performance concrete-normal concrete composite beam bridge according to any one of claim 1-5 Girder construction, it is characterised in that:The bridge structure sets up the multispan structure of multiple prefabricated U HPC duplexs font beam elements for longitudinal direction, Each prefabricated U HPC duplex font beam elements are by least one duplexing font beam element for setting laterally side by side(1)Composition, it is single The span of the prefabricated U HPC duplexs font beam element is 20m ~ 60m.
8. duplexing font ultra-high performance concrete-normal concrete composite beam bridge according to any one of claim 2-5 Girder construction, it is characterised in that:The i-shaped roof beam(3)Including top flange(31), lower flange(32)And web(33), the I-shaped Ellbeam(3)Rise-span ratio~, web(33)Width for 0.10m ~ 0.25m, top flange(31)Width for 0.18m ~ 0.55m, lower flange(32)Width for 0.45m ~ 1.0m, two panels i-shaped roof beam(3)Horizontal spacing for 1.2m ~ 3.0m, it is described Floorings(2)Panel thickness be 0.12m ~ 0.30m.
9. a kind of duplexing font ultra-high performance concrete-normal concrete combination beam as any one of claim 1-8 The construction method of bridge structure, comprises the following steps:
(a)In factory or scene using the integral prefabricated duplexing font beam element of ultra-high performance concrete(1);
(b)Horizontal assembled prefabricated duplexing font beam element at the construction field (site)(1)Obtain the prefabricated U HPC duplex fonts of single span Beam element, if multispan structure, it is necessary to longitudinally set up multiple prefabricated U HPC duplexs font beam elements;
(c1)If freely supported structure, in adjacent two prefabricated duplexing font beam elements(1)End diaphragm plate(4)Wet seam(6) Place connects, and without concreting between longitudinal girder, first pours normal concrete floorings(2), adjacent longitudinal bridge floor Plate(2)Between leave expansion joint(8), then conserved;
(c2)If bridge floor is continuous, girder freely supported structure, adjacent two prefabricated duplexing font beam elements(1)End diaphragm plate(4) Wet seam(6)Place connects, and normal concrete floorings are poured without concreting, whole bridge between longitudinal girder(2), into Row maintenance;
(c3)If bridge floor is continuous, girder continuous structure, adjacent two prefabricated duplexing font beam elements(1)End diaphragm plate(4) Wet seam(6)Place connects, the longitudinal wet joint between longitudinal girder(7)Being poured with normal concrete makes girder continuous, then whole Bridge pours continuous normal concrete floorings(2), conserved;
(d)Complete the construction of deck paving and appurtenant work.
CN201711259066.2A 2017-12-04 2017-12-04 Duplexing font ultra-high performance concrete-normal concrete composite beam bridge girder construction and its construction method Pending CN108060634A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109024219A (en) * 2018-07-30 2018-12-18 湖南大学 A kind of prefabricated ultra-high performance concrete-normal concrete composite beam bridge girder construction and construction method
CN113605213A (en) * 2021-08-20 2021-11-05 上海市城市建设设计研究总院(集团)有限公司 Novel assembled steel-concrete combined steel plate beam
CN114197321A (en) * 2022-01-06 2022-03-18 湖南大学 Prestressed UHPC-NC combined continuous box girder bridge and construction method thereof
CN114438873A (en) * 2022-02-16 2022-05-06 湖南大学 Prefabricated ultrahigh-performance concrete hollowed-out T-shaped beam bridge structure and construction method thereof

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109024219A (en) * 2018-07-30 2018-12-18 湖南大学 A kind of prefabricated ultra-high performance concrete-normal concrete composite beam bridge girder construction and construction method
CN113605213A (en) * 2021-08-20 2021-11-05 上海市城市建设设计研究总院(集团)有限公司 Novel assembled steel-concrete combined steel plate beam
CN114197321A (en) * 2022-01-06 2022-03-18 湖南大学 Prestressed UHPC-NC combined continuous box girder bridge and construction method thereof
CN114438873A (en) * 2022-02-16 2022-05-06 湖南大学 Prefabricated ultrahigh-performance concrete hollowed-out T-shaped beam bridge structure and construction method thereof

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