CN114541248A - Variable-slope large-section prefabricated superposed beam lifting lug structure and construction method thereof - Google Patents

Variable-slope large-section prefabricated superposed beam lifting lug structure and construction method thereof Download PDF

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CN114541248A
CN114541248A CN202210302029.XA CN202210302029A CN114541248A CN 114541248 A CN114541248 A CN 114541248A CN 202210302029 A CN202210302029 A CN 202210302029A CN 114541248 A CN114541248 A CN 114541248A
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lifting lug
lifting
lug
composite beam
variable
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周胜军
谈虎
张建华
熊赛江
王成
王东方
陈健伟
陶学超
王东燕
殷欣
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Third Construction Co Ltd of China Construction Eighth Engineering Divison Co Ltd
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Third Construction Co Ltd of China Construction Eighth Engineering Divison Co Ltd
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    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D19/00Structural or constructional details of bridges
    • 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

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Abstract

本发明提供一种变坡大截面预制叠合梁吊耳构造,包括吊耳主板,所述吊耳主板的上部设有起重吊孔,所述吊耳主板的下部设有吊耳加劲板,所述吊耳主板的底端设有吊耳底板,所述吊耳底板上设有若干安装孔。本发明还提供一种所述变坡大截面预制叠合梁吊耳构造的施工方法。本发明解决了复杂环境下叠合梁难以安装、特殊起吊工况下叠合梁结构受力不均等问题,大大提高了施工安全性和节约了施工成本。

Figure 202210302029

The invention provides a lifting lug structure of a prefabricated superimposed beam with variable slope and large cross-section, which includes a lifting lug main plate, the upper part of the lifting lug main plate is provided with lifting holes, and the lower part of the lifting lug main plate is provided with a lifting lug stiffening plate. The bottom end of the lifting lug main board is provided with a lifting lug bottom plate, and the lifting lug bottom plate is provided with several mounting holes. The invention also provides a construction method of the variable-slope large-section prefabricated composite beam lifting lug structure. The invention solves the problems that the superimposed beam is difficult to install in a complex environment, and the structural stress of the superimposed beam is uneven under special hoisting conditions, and greatly improves the construction safety and saves the construction cost.

Figure 202210302029

Description

一种变坡大截面预制叠合梁吊耳构造及其施工方法A variable-slope large-section prefabricated composite beam lifting lug structure and its construction method

技术领域technical field

本发明涉及叠合梁吊装施工技术领域,具体涉及一种变坡大截面预制叠合梁吊耳构造及其施工方法。The invention relates to the technical field of hoisting construction of superimposed beams, in particular to a lifting lug structure of a variable-slope large-section prefabricated superimposed beam and a construction method thereof.

背景技术Background technique

随着社会发展步伐的加快,预制拼装构件成为现代化建设的主流,城市高架及高速公路对预制构件的使用频率越来越普遍。With the acceleration of social development, prefabricated components have become the mainstream of modern construction, and the frequency of use of prefabricated components in urban viaducts and highways is becoming more and more common.

城市高架及高速公路考虑到施工工效及成本的投入及施工的便捷性,为了提高预制叠合梁在预制构件厂移位、在施工现场起吊安装的工效,因此对叠合梁等构件预制过程中按照预定位置设置了相应吊点,待预制构件养护期满足要求后运输至安装现场直接采用预埋吊点起吊安装,吊装完成后直接采用切割设备将吊钩割除。Considering the construction work efficiency and cost investment and the convenience of construction, urban viaducts and expressways, in order to improve the work efficiency of prefabricated composite beams in the prefabricated component factory, lifting and installation at the construction site, so the prefabrication process of composite beams and other components Corresponding hoisting points are set according to the predetermined positions. After the maintenance period of the prefabricated components meets the requirements, the prefabricated components are transported to the installation site for hoisting and installation directly.

常规的预埋吊钩的方法有安装钢绞线吊钩法、安装碳素结构钢吊钩法等,常规不预埋吊钩的方法主要有钢丝绳兜底吊装法,但是安装钢绞线吊钩常采用多根钢绞线并排组合使用,当叠合梁任一角度倾斜工况下其钢绞线吊钩将由多根同步受力转换为单根受力,易造成钢绞线逐一断裂的危险;安装碳素结构钢吊钩情况与钢绞线吊钩相类似,仅限于叠合梁水平稳定吊装;钢绞线吊钩与碳素结构钢吊钩对锚固长度要求高,锚固端需按照计算要求设置相应锚板,仅做一次使用,大量的材料一次性使用与节能环保的理念不符;常规不预埋吊钩兜底吊法对预制构件厂叠合梁脱模移位造成极大困难,现场兜底吊安装过程中叠合梁边角对钢丝绳磨损严重,钢丝绳消耗量仅次于预埋吊钩,且起吊过程中容易造成叠合梁外观破损等不利影响。The conventional methods of pre-embedding hooks include the method of installing steel strand hooks and the method of installing carbon structural steel hooks. Multiple steel strands are used side by side in combination. When the superimposed beam is inclined at any angle, the steel strand hook will be converted from multiple simultaneous forces to single force, which is easy to cause the danger of steel strands breaking one by one; The installation of carbon structural steel hooks is similar to that of steel strand hooks, and is limited to horizontal and stable hoisting of superimposed beams; steel strand hooks and carbon structural steel hooks have high requirements on the anchoring length, and the anchoring ends must be calculated according to the requirements. The corresponding anchor plate is set up and used only once. The one-time use of a large amount of materials is not in line with the concept of energy saving and environmental protection; the conventional method of bottom-housing without pre-embedded hooks causes great difficulty in demoulding and shifting of the superimposed beams in the prefabricated component factory. During the hoisting and installation process, the edges and corners of the superimposed beams are seriously worn on the steel wire ropes, and the consumption of the wire ropes is second only to the pre-embedded hooks, and the appearance of the superimposed beams is easily damaged during the lifting process.

发明内容SUMMARY OF THE INVENTION

本发明为了克服以上技术的不足,提供了一种变坡大截面预制叠合梁吊耳构造及其施工方法,以解决现有预制叠合梁上常规预埋吊点的安装固定困难、一次性使用材料损耗严重、无法实现叠合梁水平起吊的技术难题。In order to overcome the deficiencies of the above technologies, the present invention provides a variable-slope and large-section prefabricated composite beam lifting lug structure and a construction method thereof, so as to solve the difficulty in installation and fixation of conventional pre-embedded lifting points on the existing prefabricated composite beams, and the one-time The technical problem is that the material loss is serious and the horizontal lifting of the superimposed beam cannot be realized.

本发明克服其技术问题所采用的技术方案是:一种变坡大截面预制叠合梁吊耳构造,包括吊耳主板,所述吊耳主板的上部设有起重吊孔,所述吊耳主板的下部设有吊耳加劲板,所述吊耳主板的底端设有吊耳底板,所述吊耳底板上设有若干安装孔。The technical solution adopted by the present invention to overcome its technical problems is as follows: a variable-slope large-section prefabricated composite beam lifting lug structure includes a lifting lug main plate, the upper part of the lifting lug main plate is provided with a lifting hole, and the lifting lug The lower part of the main board is provided with a lifting lug stiffening plate, the bottom end of the main plate of the lifting lug is provided with a lifting lug bottom plate, and a plurality of installation holes are arranged on the lifting lug bottom plate.

优选地,所述吊耳构造选用不低于Q355级的钢材料制成。Preferably, the lifting lug structure is made of steel material not lower than Q355.

优选地,所述吊耳主板的最小厚度为32mm,所述吊耳加劲板的最小厚度为30mm,所述吊耳底板的最小厚度为44mm。Preferably, the minimum thickness of the lifting lug main plate is 32 mm, the minimum thickness of the lifting lug stiffening plate is 30 mm, and the minimum thickness of the lifting lug bottom plate is 44 mm.

本发明还提供一种所述的变坡大截面预制叠合梁吊耳构造的施工方法,包括下述步骤:The present invention also provides a construction method of the described variable-slope large-section prefabricated composite beam lifting lug structure, comprising the following steps:

S1、叠合梁预制过程中,在叠合梁上开设若干与安装孔相对应的固定孔,在叠合梁的上端浇筑钢筋混凝土湿接缝,在所述钢筋混凝土湿接缝上开设若干与安装孔相对应的预留孔,叠合梁预制完成后运输至现场,起吊所述吊耳构造,所述吊耳底板与钢筋混凝土湿接缝的顶面密贴,使所述吊耳主板保持竖直,采用吊杆依次穿过安装孔、预留孔和固定孔,通过螺母紧固;S1, in the prefabrication process of the superimposed beam, a number of fixing holes corresponding to the installation holes are opened on the superimposed beam, a reinforced concrete wet joint is poured on the upper end of the superimposed beam, and a number of reinforced concrete wet joints are opened on the reinforced concrete wet joint. For the reserved holes corresponding to the installation holes, the prefabricated superimposed beams are transported to the site, and the lifting lug structure is lifted. Vertical, the suspension rod is used to pass through the installation hole, the reserved hole and the fixing hole in turn, and fastened by the nut;

S2、采用步骤1的方法于叠合梁上安装数个所述吊耳构造,并通过使用不同尺寸吊耳构造组合实现吊耳构造竖直和顶部标高一致;S2, using the method of step 1 to install several of the lifting lug structures on the superimposed beam, and by using the combination of different sizes of the lifting lug structures, the vertical and top elevations of the lifting lug structures are consistent;

S3、待一片叠合梁8个吊耳构造全部安装完成后,将叠合梁缓缓提起,通过运梁船驶离安装现场,吊装至在已安装/施工完成盖梁或支架上,最终安装至预定位置;S3. After all the 8 lifting lugs of a superimposed beam are installed, lift the superimposed beam slowly, leave the installation site by the beam transport ship, and hoist it to the installed/completed cover beam or bracket, and finally install it. to the predetermined location;

S4、安装到位后复核叠合梁中心线与桥梁设计线型是否一致,确认无误后卸除吊耳构造进行下一片叠合梁吊装。S4. After the installation is in place, check whether the center line of the superimposed beam is consistent with the design line of the bridge. After confirming that it is correct, remove the lifting lug structure and hoist the next superimposed beam.

优选地,S1中,所述吊耳构造安装前,预先在所述浇筑混凝土的预留孔内埋设护壁钢管。Preferably, in S1, before the lifting lug structure is installed, a wall-protecting steel pipe is pre-buried in the reserved hole for pouring concrete.

优选地,S1中,所述吊杆的上部通过平螺母紧固,下部通过锥螺母紧固,所述锥螺母与钢筋混凝土湿接缝之间安装钢垫板。Preferably, in S1, the upper part of the boom is fastened by a flat nut, the lower part is fastened by a conical nut, and a steel backing plate is installed between the conical nut and the reinforced concrete wet joint.

优选地,S1中,所述吊杆的屈服强度≥235MPa,抗拉强度≥365MPa,延伸率≥25%。Preferably, in S1, the yield strength of the boom is ≥235 MPa, the tensile strength is ≥365 MPa, and the elongation is ≥25%.

优选地,所述钢垫板的厚度为35-44mm。Preferably, the thickness of the steel backing plate is 35-44mm.

相对于现有技术,本发明的有益效果是:本发明在预制叠合梁安装时采用吊耳起吊,解决了常规的预埋吊钩的方法有安装钢绞线吊钩法和安装碳素结构钢吊钩法吊点受力不均匀、容易造成钢绞线逐一断裂的危险、无法实现倾斜吊装工况、吊钩预埋过程中容易移位、一次性使用提高造价等技术经济难题。采用本发明的吊耳及叠合梁安装方法具有吊耳强度高、加工成本低、一次投入长期循环使用、磨损配件(高强螺杆及螺母)易于更换、可实现叠合梁水平吊装、起吊稳定等优点。对类似的预制叠合梁吊装安全性、稳定性、技术性能上有相当重要的参考价值,降低了施工成本投入,社会效益和经济效益显著。Compared with the prior art, the beneficial effects of the present invention are: the present invention adopts lifting lugs to lift when the prefabricated composite beam is installed, and solves the conventional methods of pre-embedded hooks, including the method of installing steel strand hooks and the installation of carbon structures. The steel hook method has technical and economic problems such as uneven force on the lifting point, the danger of breaking the steel strands one by one, the inability to achieve inclined hoisting conditions, the easy displacement of the hook during the pre-embedding process, and the increased cost of one-time use. The lifting lug and the superimposed beam installation method of the present invention have the advantages of high strength of the lifting lug, low processing cost, long-term cyclic use after one-time investment, easy replacement of worn parts (high-strength screws and nuts), horizontal hoisting of the superimposed beam, stable hoisting, etc. advantage. It has a very important reference value for the hoisting safety, stability and technical performance of similar prefabricated composite beams, reduces the construction cost investment, and has significant social and economic benefits.

附图说明Description of drawings

图1为本发明一种变坡大截面预制叠合梁吊耳构造的结构示意图。FIG. 1 is a schematic structural diagram of a variable-slope large-section prefabricated composite beam lifting lug structure of the present invention.

图2、3为图1的局部结构示意图。2 and 3 are schematic diagrams of partial structures of FIG. 1 .

图4为本发明一种变坡大截面预制叠合梁构造的施工示意图。FIG. 4 is a schematic view of the construction of a prefabricated composite beam structure with variable slope and large section according to the present invention.

图5为图4的局部结构示意图。FIG. 5 is a schematic diagram of a partial structure of FIG. 4 .

图中,1、吊耳主板;2、起重吊孔;3、吊耳加劲板;4、吊耳底板;5、吊杆;6、平螺母;7、护壁钢管;8、钢垫板;9、锥螺母;10、钢筋混凝土湿接缝;11、叠合梁;12、吊具;13、吊装分配梁;14、起重设备。In the figure, 1. Main board of the lifting lug; 2. Lifting holes; 3. The stiffening plate of the lifting lug; 4. The bottom plate of the lifting lug; 9. Cone nut; 10. Reinforced concrete wet joint; 11. Composite beam; 12. Spreader; 13. Hoisting distribution beam; 14. Lifting equipment.

具体实施方式Detailed ways

为了使本发明实现的技术手段、创作特征、达成目的与功效易于明白了解,下面结合具体图示,进一步阐述本发明。In order to make it easy to understand the technical means, creation features, achieved goals and effects of the present invention, the present invention will be further described below with reference to the specific figures.

实施例Example

一种变坡大截面预制叠合梁吊耳构造,如图1-3所示,包括吊耳主板1,吊耳主板1的上部设有起重吊孔2,起重吊孔2的直径为160mm,其能够通过轴销+吊具与起重设备连接进行吊装作业,起重吊孔2采用≥50T级卸扣与吊具连接,吊耳主板1的下部设有吊耳加劲板3,吊耳加劲板3角焊缝焊接固定加强,设于吊耳主板1的左右侧,每侧各设置两个,吊耳主板1的底端设有吊耳底板4,吊耳底板4全熔透焊接固定,吊耳底板4沿吊耳主板1左右方向水平布置,吊耳加劲板3与吊耳主板1、吊耳底板4半熔透焊接固定加强,吊耳底板4上设有8个均匀分布的安装孔,安装孔的长度为450mm×32mm。A prefabricated superimposed beam lifting lug structure with variable slope and large cross-section, as shown in Figure 1-3, includes a lifting lug main plate 1, the upper part of the lifting lug main plate 1 is provided with a lifting hole 2, and the diameter of the lifting hole 2 is 160mm, it can be hoisted by connecting the shaft pin + spreader to the lifting equipment. The lifting hole 2 is connected to the spreader with a shackle of ≥50T level. The 3 fillet welds of the lug stiffening plate are welded, fixed and strengthened. They are located on the left and right sides of the lifting lug main plate 1, and two on each side. Fixing, the lifting lug bottom plate 4 is horizontally arranged along the left and right direction of the lifting lug main plate 1, the lifting lug stiffening plate 3 and the lifting lug main plate 1 and the lifting lug bottom plate 4 are semi-penetrated and welded to be fixed and strengthened, and the lifting lug bottom plate 4 is provided with 8 evenly distributed Mounting holes, the length of the mounting holes is 450mm×32mm.

进一步地,所述吊耳构造选用不低于Q355级的钢材料制成,根据高速公路及城市高架叠合梁的重量,单个吊耳构造起重量为50t可满足现状箱梁起重性能要求。吊耳主板1的最小厚度为32mm,吊耳加劲板3的最小厚度为30mm,吊耳底板4的最小厚度为44mm。Further, the lifting lug structure is made of steel material not lower than Q355. According to the weight of the highway and urban elevated superimposed beams, the lifting capacity of a single lifting lug structure is 50t, which can meet the current box girder lifting performance requirements. The minimum thickness of the lifting lug main plate 1 is 32 mm, the minimum thickness of the lifting lug stiffening plate 3 is 30 mm, and the minimum thickness of the lifting lug bottom plate 4 is 44 mm.

一种所述变坡大截面预制叠合梁吊耳构造的施工方法,如图1-5所示,包括下述步骤:A construction method of the variable-slope large-section prefabricated composite beam lifting lug structure, as shown in Figures 1-5, includes the following steps:

S1、叠合梁11预制过程中,在叠合梁11上开设与安装孔相对应的固定孔,在叠合梁11的上端浇筑钢筋混凝土湿接缝10,在钢筋混凝土湿接缝10上开设与安装孔相对应的贯通的预留孔,在预留孔内埋设φ32*3mm护壁钢管7,作为后期吊杆5安装导向保护作用,叠合梁11预制完成后运输至现场,采用起重设备起吊所述吊耳构造,吊耳底板4与钢筋混凝土湿接缝10的顶面密贴,使吊耳主板1保持竖直,调整吊耳主板1高度,使吊耳构造的顶面标高一致,采用吊杆5依次穿过安装孔、预留孔和固定孔,通过螺母紧固连接,吊杆5的上部通过高强平螺母6紧固,下部通过高强锥螺母9紧固,锥螺母9与钢筋混凝土湿接缝10之间安装钢垫板8;S1. During the prefabrication process of the superimposed beam 11, a fixing hole corresponding to the installation hole is opened on the superimposed beam 11, a reinforced concrete wet joint 10 is poured on the upper end of the superimposed beam 11, and a reinforced concrete wet joint 10 is opened. The through reserved holes corresponding to the installation holes are embedded with φ32*3mm protective wall steel pipes 7 in the reserved holes to serve as the guide and protection for the installation of the boom 5 in the later stage. Lifting the lifting lug structure, the lifting lug bottom plate 4 is closely attached to the top surface of the reinforced concrete wet joint 10, so that the lifting lug main plate 1 is kept vertical, and the height of the lifting lug main plate 1 is adjusted so that the top surface elevation of the lifting lug structure is consistent, The hanger rod 5 is used to pass through the installation hole, the reserved hole and the fixing hole in turn, and is fastened and connected by nuts. The upper part of the hanger rod 5 is fastened by the high-strength flat nut 6, and the lower part is fastened by the high-strength cone nut 9. The cone nut 9 is connected to the steel bar. A steel backing plate 8 is installed between the concrete wet joints 10;

S2、采用步骤1的方法于叠合梁11上安装所述吊耳构造,叠合梁11每个横向吊装截面由4个吊耳构造组成一组,每个叠合梁含2个吊装截面共计8个吊耳构造,并通过使用不同尺寸吊耳构造组合实现吊耳构造竖直和顶部标高一致,以保证叠合梁11在水平工况下提梁;S2. The method of step 1 is used to install the lifting lug structure on the superimposed beam 11. Each lateral hoisting section of the superimposed beam 11 is composed of 4 lifting lug structures, and each superposed beam contains 2 hoisting sections in total. There are 8 lifting lug structures, and the vertical and top elevations of the lifting lug structure are consistent by using the combination of different sizes of lifting lug structures to ensure that the superimposed beam 11 can lift the beam under horizontal conditions;

S3、待一片叠合梁8个吊耳构造全部安装完成后,对吊杆5的扭力值进行验收,检查混凝土预制构件外观质量及合格证明书,起吊前再次复核叠合梁里程方向是否有误,复核盖梁/支架15的平面位置、高程;检查无误后将吊装分配梁13与叠合梁11上安装的起重吊孔2通过吊具12连接固定,检查无问题后,缓慢提升30cm左右进行试吊,无误后通过运梁船驶离安装现场,待起重设备14将叠合梁11提升至盖梁/支架15顶上后,调整叠合梁11前后左右位置,将叠合梁11吊装至预定落梁位置;S3. After the 8 lifting lugs of a composite beam are all installed, check the torsion value of the hanging rod 5, check the appearance quality and qualification certificate of the prefabricated concrete components, and check again whether the mileage direction of the composite beam is wrong before lifting. , Review the plane position and elevation of the cover beam/support 15; after checking, connect and fix the hoisting distribution beam 13 and the lifting hole 2 installed on the superimposed beam 11 through the hanger 12. After checking that there is no problem, slowly lift it by about 30cm Carry out a trial hoisting, and leave the installation site by the beam transporting ship. Hoisting to the predetermined drop beam position;

S4、安装到位后复核叠合梁中心线与桥梁设计线型是否一致,确认无误后拆除吊杆5、平螺母6、锥螺母9,解除叠合梁11与吊耳构造的连接,进行下一片叠合梁吊装。S4. After the installation is in place, check whether the center line of the superimposed beam is consistent with the design line of the bridge. After confirmation, remove the hanger rod 5, flat nut 6 and cone nut 9, release the connection between the superimposed beam 11 and the lifting lug structure, and proceed to the next piece Laminated beam hoisting.

进一步地,吊杆5为材质PSB830、25级以上精轧螺纹钢,其屈服强度≥235MPa,抗拉强度≥365MPa,延伸率≥25%,钢垫板8的截面尺寸为250*160mm,厚度可为35-44mm。Further, the boom 5 is made of PSB830, grade 25 or higher finishing rebar, its yield strength is ≥235MPa, the tensile strength is ≥365MPa, and the elongation is ≥25%. 35-44mm.

本发明通过高强精轧螺纹钢与高强螺母将该吊耳构造与叠合梁11有效固定,起重设备14的吊具12与叠合梁吊耳卸扣进行连接,结合叠合梁11线型,调整吊耳主板1高度、吊耳底板4坡度及厚度制作成不同尺寸吊耳,不同尺寸吊耳组合使用实现吊耳竖直和顶部标高一致,可以保证叠合梁水平工况下提梁,提升高度超过盖梁/支架15后调整叠合梁11姿态并安装至指定落梁位置,叠合梁11吊装时姿态更加灵活,吊耳构造与叠合梁11连接对叠合梁本身不会造成不利影响。In the present invention, the lifting lug structure is effectively fixed to the superimposed beam 11 by means of high-strength finishing threaded steel and high-strength nuts. , Adjust the height of the main board 1 of the lifting lug, the slope and thickness of the bottom 4 of the lifting lug to make lifting ears of different sizes, and the combined use of the lifting ears of different sizes makes the vertical and top elevations of the lifting ears consistent, which can ensure that the beam is lifted and lifted under the horizontal condition of the superimposed beam. After the height exceeds the cover beam/support 15, adjust the posture of the superimposed beam 11 and install it to the designated drop beam position, the posture of the superimposed beam 11 is more flexible when hoisting, and the connection between the lifting lug structure and the superimposed beam 11 will not cause any disadvantage to the superimposed beam itself influences.

最后应说明的是:以上所述仅为本发明的优选实施例而已,并不用于限制本发明,尽管参照前述实施例对本发明进行了详细的说明,对于本领域的技术人员来说,其依然可以对前述各实施例所记载的技术方案进行修改,或者对其中部分技术特征进行等同替换。凡在本发明的精神和原则之内,所作的任何修改、等同替换、改进等,均应包含在本发明的保护范围之内。Finally, it should be noted that the above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, the The technical solutions described in the foregoing embodiments may be modified, or some technical features thereof may be equivalently replaced. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (8)

1. The utility model provides a prefabricated superposed beam lug structure of variable slope large-section, its characterized in that, includes the lug mainboard, the upper portion of lug mainboard is equipped with the jack-up lifting eye, the lower part of lug mainboard is equipped with lug stiffener, the bottom of lug mainboard is equipped with the lug bottom plate, be equipped with a plurality of mounting holes on the lug bottom plate.
2. The variable-slope large-section precast composite beam lifting lug structure according to claim 1, wherein the lifting lug structure is made of steel materials not lower than Q355 grade.
3. The variable-slope large-section precast composite beam lifting lug structure according to claim 1, wherein the minimum thickness of the lifting lug main plate is 32mm, the minimum thickness of the lifting lug stiffening plate is 30mm, and the minimum thickness of the lifting lug bottom plate is 44 mm.
4. A construction method for constructing a lifting lug structure of a variable-slope large-section precast composite beam as claimed in any one of claims 1 to 3, which is characterized by comprising the following steps:
s1, in the process of prefabricating the composite beam, arranging a plurality of fixing holes corresponding to the mounting holes on the composite beam, pouring a reinforced concrete wet joint at the upper end of the composite beam, arranging a plurality of preformed holes corresponding to the mounting holes on the reinforced concrete wet joint, transporting the composite beam to the site after prefabrication is completed, lifting the lifting lug structure, enabling the lifting lug bottom plate to be closely attached to the top surface of the reinforced concrete wet joint, enabling the lifting lug main plate to be vertical, sequentially penetrating the mounting holes, the preformed holes and the fixing holes by using a lifting rod, and fastening by using nuts;
s2, mounting a plurality of lifting lug structures on the superposed beam by adopting the method in the step 1, and realizing the vertical consistency of the lifting lug structures and the top elevation consistency by using the lifting lug structure combinations with different sizes;
s3, after the 8 lifting lug structures of one laminated beam are completely installed, slowly lifting the laminated beam, driving the laminated beam away from an installation site through a beam transporting ship, hoisting the laminated beam to an installed/constructed cover beam or a bracket, and finally installing the laminated beam to a preset position;
and S4, after the composite beam is installed in place, whether the central line of the composite beam is consistent with the designed line type of the bridge or not is checked, and the lifting lug structure is removed after the error is determined to hoist the next composite beam.
5. The construction method according to claim 4, wherein in S1, before the installation of the lifting lug structure, a wall-protecting steel pipe is embedded in the prepared hole of the cast concrete in advance.
6. The construction method according to claim 4, wherein in S1, the upper part of the hanger rod is fastened by a flat nut, the lower part is fastened by a cone nut, and a steel shim plate is installed between the cone nut and the wet joint of the reinforced concrete.
7. The construction method according to claim 4, wherein in S1, the yield strength of the hanger rod is not less than 235MPa, the tensile strength is not less than 365MPa, and the elongation is not less than 25%.
8. The construction method according to claim 6, wherein the thickness of the steel backing plate is 35-44 mm.
CN202210302029.XA 2022-03-24 2022-03-24 Variable-slope large-section prefabricated superposed beam lifting lug structure and construction method thereof Pending CN114541248A (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101026012B1 (en) * 2010-11-25 2011-03-30 (주) 한국비계 Bridge deck dismantling method using lifting jack integrated with bridge
CN207713242U (en) * 2017-10-31 2018-08-10 中交二公局第二工程有限公司 Suspender equipment suitable for the asynchronous lifting construction of steel-concrete composite beam cable-stayed bridge girder
CN109183620A (en) * 2018-09-05 2019-01-11 广东省长大公路工程有限公司 Telescoping bracket, steel box-girder hanging device and hanging method
CN209941509U (en) * 2019-04-17 2020-01-14 中交路桥建设有限公司 Temporary connecting device for mid-span closure construction of steel-concrete composite beam cable-stayed bridge
CN111648234A (en) * 2020-06-30 2020-09-11 中铁第四勘察设计院集团有限公司 Steel-concrete composite beam concrete bridge deck slab capable of being constructed quickly and hoisting system thereof
CN214003773U (en) * 2020-12-28 2021-08-20 中交一公局第二工程有限公司 An assembled multi-wing D-shaped lifting lug
CN113699891A (en) * 2021-08-27 2021-11-26 上海市基础工程集团有限公司 Processing, manufacturing and construction method of prefabricated small box girder hanging bracket

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101026012B1 (en) * 2010-11-25 2011-03-30 (주) 한국비계 Bridge deck dismantling method using lifting jack integrated with bridge
CN207713242U (en) * 2017-10-31 2018-08-10 中交二公局第二工程有限公司 Suspender equipment suitable for the asynchronous lifting construction of steel-concrete composite beam cable-stayed bridge girder
CN109183620A (en) * 2018-09-05 2019-01-11 广东省长大公路工程有限公司 Telescoping bracket, steel box-girder hanging device and hanging method
CN209941509U (en) * 2019-04-17 2020-01-14 中交路桥建设有限公司 Temporary connecting device for mid-span closure construction of steel-concrete composite beam cable-stayed bridge
CN111648234A (en) * 2020-06-30 2020-09-11 中铁第四勘察设计院集团有限公司 Steel-concrete composite beam concrete bridge deck slab capable of being constructed quickly and hoisting system thereof
CN214003773U (en) * 2020-12-28 2021-08-20 中交一公局第二工程有限公司 An assembled multi-wing D-shaped lifting lug
CN113699891A (en) * 2021-08-27 2021-11-26 上海市基础工程集团有限公司 Processing, manufacturing and construction method of prefabricated small box girder hanging bracket

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