WO2024082711A1 - 分片装配式变截面箱梁结构及施工方法 - Google Patents
分片装配式变截面箱梁结构及施工方法 Download PDFInfo
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- WO2024082711A1 WO2024082711A1 PCT/CN2023/104508 CN2023104508W WO2024082711A1 WO 2024082711 A1 WO2024082711 A1 WO 2024082711A1 CN 2023104508 W CN2023104508 W CN 2023104508W WO 2024082711 A1 WO2024082711 A1 WO 2024082711A1
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- segment
- web
- vertical rib
- bottom plate
- top plate
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- 238000010276 construction Methods 0.000 title claims abstract description 29
- 230000002787 reinforcement Effects 0.000 claims abstract description 25
- 238000009434 installation Methods 0.000 claims description 19
- 210000002435 tendon Anatomy 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 13
- 238000003032 molecular docking Methods 0.000 claims description 5
- 239000011440 grout Substances 0.000 claims description 4
- 238000005192 partition Methods 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 11
- 238000009417 prefabrication Methods 0.000 description 9
- 238000005259 measurement Methods 0.000 description 3
- 101000827703 Homo sapiens Polyphosphoinositide phosphatase Proteins 0.000 description 2
- 102100023591 Polyphosphoinositide phosphatase Human genes 0.000 description 2
- 101100233916 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) KAR5 gene Proteins 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 101001121408 Homo sapiens L-amino-acid oxidase Proteins 0.000 description 1
- 102100026388 L-amino-acid oxidase Human genes 0.000 description 1
- 101100012902 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) FIG2 gene Proteins 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
- E01D2/04—Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
- E01D21/10—Cantilevered erection
Definitions
- the present application belongs to the technical field of bridge construction, and relates to the construction of a variable-section concrete box girder bridge, and specifically to a segmented assembled variable-section box girder structure and a construction method.
- variable cross-section box girder bridge changes along the axis of the bridge, with a larger cross section used where the bending moment is larger and a smaller cross section used where the bending moment is smaller.
- the construction methods of variable cross-section box girders usually include cast-in-place method, cantilever casting method, and segmental prefabrication cantilever assembly method.
- the segmental cantilever assembly method is a construction method that prefabricates in segments, then assembles the concrete beam body prefabricated parts in a balanced manner towards the mid-span, and applies prestressing in sections. It has been increasingly widely used due to its advantages of shorter construction period and higher quality.
- the purpose of this application is to solve the difficulties in prefabrication, storage, transportation and installation of cantilevered sections of large-width variable-section box girders, and to provide a segmented assembled variable-section box girder structure and construction method, in which the top plate, bottom plate and web of the box girder are prefabricated in plate units and installed in segmented cantilevers to reduce the difficulty of prefabrication and the investment in large equipment, thereby reducing construction costs while ensuring project quality.
- the present application provides a segmented assembled variable-section box girder structure, which includes a plurality of segments assembled to each other, each segment including a top plate unit, two web plate units and a bottom plate unit, wherein:
- the two ends of the bottom surface of the top plate unit are respectively connected to the top surfaces of the two web plate units, and the two ends of the top surface of the bottom plate unit are respectively connected to the bottom surfaces of the two web plate units;
- a longitudinal prestressed channel is provided inside the web unit, and a plurality of web vertical ribs are pre-embedded, and a threaded sleeve is connected to the upper and lower ends of each web vertical rib respectively;
- a top plate vertical rib corresponding to the web plate vertical rib is provided inside the top plate unit, and the lower end of each top plate vertical rib is threadedly connected to a threaded sleeve threadedly connected to the upper end of the corresponding web plate vertical rib;
- Bottom plate vertical ribs corresponding to the web vertical ribs are arranged in the bottom plate unit, and the upper end of each bottom plate vertical rib is threadedly connected to a threaded sleeve threadedly connected to the lower end of the corresponding web vertical rib.
- each threaded sleeve is threadedly connected to the corresponding web vertical rib, and the other end of each threaded sleeve is threadedly connected to the lower end of the corresponding top plate vertical rib or to the upper end of the corresponding bottom plate vertical rib.
- a preferred solution is that a top plate vertical rib channel corresponding to the top plate vertical rib is provided inside the top plate unit, and the top plate vertical rib is passed through the corresponding top plate vertical rib channel.
- a bottom plate vertical rib channel corresponding to the bottom plate vertical rib is provided inside the bottom plate unit, and the bottom plate vertical rib is passed through the corresponding bottom plate vertical rib channel.
- a preferred solution is that a notch is provided at the lower edge of the web unit, and the edge of the notch corresponds to the segmented position of the bottom plate unit.
- the segments are assembled by butting against each other via shear keys and shear key slots matched with the shear keys.
- a preferred solution is that a plurality of shear keys are provided on one end face of each segment, and a shear key slot corresponding to each shear key is provided on the other end face;
- the shear key of one segment mates with the shear key slot of another segment.
- a preferred solution is that a plurality of shear keys are respectively provided on one end surface of the top plate unit, web plate unit and bottom plate unit of each segment, and a shear key slot corresponding to each shear key is respectively provided on the other end surface.
- the present application also provides a construction method of a segmented assembled variable-section box girder, which is used to construct the segmented assembled variable-section box girder structure, wherein the construction method comprises the following steps:
- the two web units of the first segment are hoisted to the two ends of the bottom plate unit of the first segment for docking, and the upper end of each bottom plate vertical rib is connected to the threaded sleeve at the lower end of the corresponding web vertical rib.
- the lower half of the cylinder is screwed, grouting is poured into the vertical reinforcement holes of the bottom plate, and a middle partition is installed between the two web plate units;
- top plate of the first section is hoisted onto the two web plate units, and the top plate vertical ribs are inserted into the top plate vertical rib channels, the lower end of each top plate vertical rib is screwed to the upper half of the threaded sleeve at the upper end of the corresponding web plate vertical rib, and grouting is performed into the top plate vertical rib channels;
- the two web units of the second segment and the third segment are hoisted respectively, and the web units of the second segment and the third segment are butted with the web units of the first segment through shear keys and shear key slots respectively, and the corresponding longitudinal prestressed tendons are inserted into the prestressed holes of the two web units of the second segment and the third segment, and the prestressed tendons of the second segment and the third segment are preliminarily tensioned;
- the bottom plate unit of the second segment is hoisted and connected with the two web plate units of the second segment, and the bottom plate unit of the third segment is connected with the two web plate units of the third segment.
- the bottom plate units of the second segment and the third segment are connected with the shear keys on the bottom plate of the first segment respectively, and the bottom plate vertical ribs are inserted into the vertical rib holes of the bottom plate units of the second segment and the third segment, and the upper end of each bottom plate vertical rib is screwed with the lower half of the threaded sleeve at the lower end of the corresponding web vertical rib, and the bottom plate vertical rib holes are grouted to connect the corresponding bottom plate unit and the web unit as a whole;
- the longitudinal prestressed tendons of the second segment and the third segment are tensioned twice, and the prestressed tendons are Stress pipeline grouting to complete the installation of the second and third sections;
- the present application has made innovations in the prefabrication and assembly form of the box beam, breaking through the limitations of the traditional segment prefabrication and cantilever assembly methods.
- the box beam structure of the present application has the following advantages over the prior art:
- the size and hoisting weight of prefabricated components can be greatly reduced.
- the model and power requirements of prefabrication, storage, transportation and hoisting equipment are low, which can reduce the investment in large equipment and reduce machinery costs;
- variable-section box girder segments By re-dividing and layout the variable-section box girder segments, most units can be designed as universal plate units, reducing the number of templates and facilitating construction quality control;
- the board units can be stored in multi-layer stacking, saving storage pedestals and space;
- FIG1 is a schematic diagram of the overall structure of a segmented assembled variable-section box girder of the present application
- FIG2 is an exploded structural perspective view of a segmented assembled variable-section box girder
- FIG3 is an exploded structural cross-sectional view of a segmented assembled variable-section box girder
- FIG4 is a cross-sectional view of a segmented assembled variable-section box girder where vertical reinforcement is provided
- FIG5 is a schematic diagram of the bottom plate installation structure of block No. 0;
- FIG6 is a schematic diagram of the web installation structure of block No. 0;
- FIG7 is a schematic diagram of the top plate installation structure of block No. 0;
- FIG8 is a schematic diagram of the arrangement of longitudinal prestressed tendons of a variable cross-section box girder
- Figure 9 is a schematic diagram of the installation structure of the bridge deck crane
- Figure 10 is a schematic diagram of the web hoisting state of block No. 1;
- Figure 11 is a schematic diagram of the lifting and installation state of block No. 1;
- FIG12 is a schematic diagram of the top plate installation state of block No. 1;
- FIG. 13 is a schematic diagram showing the status of block No. 1 after installation is completed.
- the present application provides a segmented assembled variable-section box girder structure, comprising a plurality of segments assembled to each other, each segment comprising a top plate unit, two web plate units and a bottom plate unit, wherein the two ends of the bottom surface of the top plate unit are respectively connected to the top surfaces of the two web plate units, and the two ends of the top surface of the bottom plate unit are respectively connected to the bottom surfaces of the two web plate units; a longitudinal prestressed channel is provided inside the web plate unit, and a plurality of web plate vertical ribs are pre-embedded, and a threaded sleeve is respectively connected to the upper and lower ends of each web plate vertical rib; a top plate vertical rib corresponding to the web plate vertical rib is provided inside the top plate unit, and the lower end of each top plate vertical rib is screwed to a threaded sleeve screwed to the upper end of the corresponding web plate vertical rib; a bottom plate vertical rib corresponding to the web plate vertical
- each threaded sleeve is threadedly connected to the corresponding web vertical rib, and the other end of each threaded sleeve is threadedly connected to the lower end of the corresponding top plate vertical rib or the upper end of the corresponding bottom plate vertical rib.
- a top plate vertical rib channel corresponding to the top plate vertical rib is provided inside the top plate unit, and the top plate vertical rib is inserted into the corresponding top plate vertical rib channel.
- a bottom plate vertical rib channel corresponding to the bottom plate vertical rib is provided inside the bottom plate unit, and the bottom plate vertical rib is inserted into the corresponding bottom plate vertical rib channel.
- the lower edge of the web unit is provided with a notch, and the edge of the notch is adjacent to the bottom That is, the lower edge of the web unit is provided with a notch to facilitate the installation and prestressing of the longitudinal prestressed anchor pad in the web; the section position of the bottom plate unit is aligned with the notch edge of the web.
- the segments are assembled by docking with each other through shear keys and shear key slots adapted to the shear keys.
- a plurality of shear keys are provided on one end face of each segment, and a shear key slot corresponding to each shear key is provided on the other end face; wherein the shear key of one segment is connected with the shear key slot of another segment.
- a plurality of shear keys are provided on one end face of the top plate unit, the web plate unit and the bottom plate unit of each segment, respectively, and a shear key slot corresponding to each shear key is provided on the other end face.
- each segment comprises a top plate unit 1, two web plate units 2 and a bottom plate unit 3.
- top plate unit 1 The two sides of the bottom surface of the top plate unit 1 are respectively butted against the top surfaces of the two web plate units 2, and the two sides of the top surface of the bottom plate unit 3 are respectively butted against the bottom surfaces of the two web plate units 2; a longitudinal prestressed duct is provided in the web plate unit 2 along the longitudinal direction of the bridge, and a plurality of web plate vertical ribs 21 are pre-embedded, and each web plate vertical rib 21 is respectively connected to a threaded sleeve 22 at the upper and lower ends, and each Half of a threaded sleeve 22 is screwed with the vertical web ribs, and a top plate vertical rib channel 11 corresponding to the vertical web ribs is provided in the top plate unit 1, and a top plate vertical rib 12 is passed through each top plate vertical rib channel, and the lower end of each top plate vertical rib 12 is screwed with the other half of the threaded sleeve 22 screwed with the upper end of a web
- the front end faces of the top plate unit 1, the web plate unit 2 and the bottom plate unit 3 are respectively provided with a plurality of shear keys 4, and the rear end faces are provided with shear key slots corresponding to each shear key.
- the shear keys are used to bear and transmit shear forces, and to assist in the assembly, inlaying and docking positioning of the segments.
- the present application also provides a construction method of a segmented assembled variable-section box girder, which is used to construct the segmented assembled variable-section box girder structure, wherein the construction method comprises the following steps:
- the two web plate units of the first segment are hoisted to the two ends of the bottom plate unit of the first segment for docking, the upper end of each bottom plate vertical rib is screwed to the lower half of the threaded sleeve at the lower end of the corresponding web plate vertical rib, grouting is performed into the bottom plate vertical rib hole, and a middle partition is installed between the two web plate units;
- top plate of the first section is hoisted onto the two web plate units, and the top plate vertical ribs are inserted into the top plate vertical rib holes, and the lower end of each top plate vertical rib is aligned with the upper end of the corresponding web plate vertical rib.
- the upper half of the threaded sleeve at the end is screwed, and grouting is poured into the vertical reinforcement hole of the top plate;
- the two web units of the second segment and the third segment are hoisted respectively, and the web units of the second segment and the third segment are butted with the web units of the first segment through shear keys and shear key slots respectively, and the corresponding longitudinal prestressed tendons are inserted into the prestressed holes of the two web units of the second segment and the third segment, and the prestressed tendons of the second segment and the third segment are preliminarily tensioned;
- the bottom plate unit of the second segment is hoisted and connected with the two web plate units of the second segment, and the bottom plate unit of the third segment is connected with the two web plate units of the third segment.
- the bottom plate units of the second segment and the third segment are connected with the shear keys on the bottom plate of the first segment respectively, and the bottom plate vertical ribs are inserted into the vertical rib holes of the bottom plate units of the second segment and the third segment, and the upper end of each bottom plate vertical rib is screwed with the lower half of the threaded sleeve at the lower end of the corresponding web vertical rib, and the bottom plate vertical rib holes are grouted to connect the corresponding bottom plate unit and the web unit as a whole;
- the 0# block is equivalent to the first segment
- the two 1# segments are equivalent to the second segment and the third segment.
- the specific construction method of the above-mentioned segmented assembled variable-section box girder is as follows:
- each box girder segment is divided into a top plate unit 1, two web plate units 2 and a bottom plate unit 3, and the division position of the top plate unit, the web plate unit and the bottom plate unit is located at the chamfered edge of the box chamber;
- the top plate unit, web plate unit and bottom plate unit are processed in the prefabrication yard.
- a longitudinal prestressed channel is provided in each web plate unit 2 along the longitudinal direction of the bridge, and a plurality of web plate vertical ribs 21 are embedded in advance according to the vertical rib layout of the box girder.
- a threaded sleeve 22 is screwed to the upper and lower ends of each web plate vertical rib, and half of each threaded sleeve is screwed to the web plate vertical rib.
- a top plate vertical rib channel 11 is provided in each top plate unit 1 corresponding to each web plate vertical rib of the two web plate units, and a bottom plate vertical rib channel 31 is reserved in each bottom plate unit 3 corresponding to each vertical rib of the two web plate units.
- a plurality of shear keys 4 are preset on the front end face of each top plate unit, web plate unit and bottom plate unit, and a corresponding shear key slot is preset on the rear end face.
- a notch is set at the lower edge of the web unit to facilitate the installation of the longitudinal prestressed anchor pad and prestressing in the web; the segmented position of the bottom plate unit is aligned with the notch edge of the web.
- top plate units, web plate units and bottom plate units are prefabricated, they are transported to the bridge construction site;
- the 0# bottom plate 3 is hoisted onto the pier 7 by a truck crane, and the bottom plate vertical reinforcement is inserted into each bottom plate vertical reinforcement hole 31;
- the 0# top plate 1 is hoisted onto the two webs 2, and the top plate vertical reinforcement is inserted into each top plate vertical reinforcement channel.
- the lower end of each top plate vertical reinforcement is screwed to the upper half of the threaded sleeve that is screwed to the upper end of the web vertical reinforcement, and the top plate vertical reinforcement channels are grouted; finally, prestressed reinforcement is inserted into the longitudinal prestressed channels of the web unit and the first tensioning is carried out to complete the installation of the 0# box girder.
- the longitudinal prestressed tendons of the present application are arranged in the same manner as the ordinary short-line segment prefabricated cantilever assembly method.
- the longitudinal prestressed tendons 5 are arranged in the web of each segment along the longitudinal direction of the bridge, which will not be elaborated here.
- the bottom plate unit 3 of the hoisted 1# segment is butted with the two webs 2 of the 1# segment and the shear key on the 0# bottom plate at the same time.
- the bottom plate vertical ribs 32 are inserted into the vertical rib holes 31 of the bottom plate unit according to the structure shown in FIG3 and FIG4 .
- the upper end of each bottom plate vertical rib 32 is screwed to the lower half of the threaded sleeve 22 at the lower end of the web vertical rib 21 .
- the bottom plate vertical rib holes are grouted to connect the bottom plate unit and the web unit as a whole.
- the top plate unit 1 of the hoisted 1# segment is butted against the two webs 2 of the 1# segment, and is also butted against the shear key on the 0# top plate; according to the structure shown in Figures 3 and 4, the top plate vertical ribs 12 are inserted into the vertical rib channels 11 of the top plate unit, and the lower end of each top plate vertical rib 12 is connected to the upper end of the web vertical rib 21.
- the upper half of the threaded sleeve 22 is screwed to grout the vertical reinforcement holes of the top plate, so that the top plate unit and the web plate unit are connected as a whole;
- step (4) As shown in FIG. 13 , the two bridge deck cranes 6 are moved forward, and subsequent segments are hoisted in sequence according to the method of step (4) until the bridge is closed.
- the segmented assembled variable-section box girder structure and construction method provided by the present invention prefabricates the top plate unit, bottom plate unit and web plate unit of the box girder into plate units, and uses a crane to hoist and assemble the segmented top plate unit, bottom plate unit and web plate unit one by one.
- This device has a small equipment model for prefabrication, storage, transportation and installation, occupies a small storage space, is easy to control quality and has a low construction cost.
- segmented assembled variable-section box girder structure and construction method proposed in the present invention are described by way of example. However, those skilled in the art should understand that various improvements can be made to the segmented assembled variable-section box girder structure and construction method proposed in the present invention without departing from the content of the present invention. Therefore, the protection scope of the present invention should be determined by the content of the attached claims.
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Abstract
本申请提供一种分片装配式变截面箱梁结构及施工方法，其中变截面箱梁结构包括相互装配的若干节段，每个节段均包括一顶板单元、两个腹板单元和一底板单元，腹板单元内预埋有多根腹板竖向筋，每根腹板竖向筋上下两端分别连接一螺纹套筒，顶板单元和底板单元内设有竖向筋孔道，顶板和底板竖向筋孔道内穿设竖向筋并分别与腹板竖向筋两端的螺纹套筒螺接。箱梁吊装施工时，各节段的单元分别吊装并通过竖向筋连接成节段整体。本申请可减少大型设备使用，降低预制施工难度和成本。
Description
本申请要求于2022年10月21日提交中国专利局、申请号为202211297038.0，发明名称为“分片装配式变截面箱梁结构及施工方法”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
本申请属于桥梁施工技术领域，涉及一种变截面混凝土箱梁桥的施工，具体涉及一种分片装配式变截面箱梁结构及施工方法。
变截面箱梁桥的截面沿桥梁轴线变化，在弯矩较大处采用较大的截面，在弯矩较小处采用较小的截面。变截面箱梁的施工方法通常有支架现浇法、挂篮悬臂浇筑法、节段预制悬臂拼装法，其中节段悬臂拼装法是一种按节段进行预制，然后平衡地逐段向跨中悬臂拼装混凝土梁体预制件，并逐段施加预应力的施工方法，因其具有工期较短、质量较高等优点得到了越来越广泛的运用。
常规的预制变截面箱梁在桥面较窄时采用单箱单室截面形式，当桥面较宽时，为减小节段尺寸和吊装质量，多采用分离多箱截面形式，节段多采用短线法预制，用一个节段作为端模，匹配预制下一个节段，因此，发明人意识到，由于节段需要反复移位，且每个节段的体积及重量仍较大，移位、存储、运输、起吊都需要大型设备配合，工程设备投入套数多，工期较长，且每次节段移位后与下一节匹配时，都需要测量定位、精调，工效低、成本高。
发明内容
本申请的目的是为解决大宽度变截面箱梁节段悬拼在预制、存储、运输和安装等方面的难题，提供一种分片装配式变截面箱梁结构及施工方法，将箱梁的顶板、底板、腹板进行板单元分片预制、分片悬臂安装，以降低预制加工难度，减少大型设备投入，在保证工程质量的前提下降低施工成本低。
本申请提供的一种分片装配式变截面箱梁结构，其中：包括相互装配的若干节段，每个节段均包括一顶板单元、两个腹板单元和一底板单元，其中，
所述顶板单元的底面的两端分别与两个腹板单元的顶面相连接，所述底板单元的顶面的两端分别与所述两个腹板单元的底面对接；
在所述腹板单元的内部设有纵向预应力孔道，并预埋有若干根腹板竖向筋，在每根腹板竖向筋的上下两端分别连接一螺纹套筒；
在所述顶板单元的内部设有与所述腹板竖向筋对应的顶板竖向筋，每根顶板竖向筋的下端与相应的腹板竖向筋的上端螺接的螺纹套筒螺接；
在所述底板单元内设有与所述腹板竖向筋对应的底板竖向筋，每根底板竖向筋的上端与相应的腹板竖向筋的下端螺接的螺纹套筒螺接。
此外，优选的方案是，每个螺纹套筒的一端与相应的腹板竖向筋螺接，每个螺纹套筒的另一端与相应的顶板竖向筋的下端或与相应的底板竖向筋的上端螺接。
此外，优选的方案是，在所述顶板单元的内部设有与所述顶板竖向筋相对应的顶板竖向筋孔道，所述顶板竖向筋穿设在相应的顶板竖向筋孔道内。
此外，优选的方案是，在所述底板单元内的内部设有与所述底板竖向筋相对应的底板竖向筋孔道，所述底板竖向筋穿设在相应的底板竖向筋孔道内。
此外，优选的方案是，在所述腹板单元的下边缘设置有缺角，所述缺角的边缘与所述底板单元的分节位置相对应。
此外，优选的方案是，各个节段之间通过剪力键以及与所述剪力键相适配的剪力键插槽相互对接进行装配。
此外，优选的方案是，在每个节段的一端面设有若干个剪力键，另一端面设置有与每个剪力键对应的剪力键插槽；其中，
一个节段的剪力键与另一个节段的剪力键插槽相对接。
此外，优选的方案是，在每个节段的所述顶板单元、腹板单元和底板单元的一端面分别设有多个剪力键，另一端面分别设有与每个剪力键对应的剪力键插槽。
本申请还提供一种分片装配式变截面箱梁施工方法，对上述分片装配式变截面箱梁结构进行施工，其中，所述施工方法包括以下步骤：
(1)吊装箱梁的第一节段：
将所述第一节段的底板单元吊装到墩柱上，并将底板竖向筋插入到相应的底板竖向筋孔道中；
将所述第一节段的两个腹板单元吊装到所述第一节段的底板单元的两端进行对接，将每根底板竖向筋的上端与相对应的腹板竖向筋的下端的螺纹套
筒的下半部螺接，向所述底板竖向筋孔道内灌浆，同时在所述两个腹板单元之间安装中隔板；
将所述第一节段的顶板吊放到所述两个腹板单元上，并将顶板竖向筋插入顶板竖向筋孔道中，将每根顶板竖向筋的下端与相对应的腹板竖向筋的上端的螺纹套筒的上半部螺接，并向所述顶板竖向筋孔道灌浆；
将预应力筋插入到所述腹板单元的纵向预应力孔道中，并进行第一次张拉，完成所述箱梁的所述第一节段安装；
(2)在所述箱梁的第一节段的顶板单元的两端分别安装桥面吊机；
(3)采用所述桥面吊机吊装第二节段和第三节段，所述第二节段和第三节段对称吊装在所述第一节段的两端：
分别吊装所述第二节段、所述第三节段的两个腹板单元，将所述第二节段、所述第三节段的腹板单元分别与所述第一节段的腹板单元通过剪力键和剪力键插槽对接，同时将相应的纵向预应力筋穿入所述第二节段、所述第三节段的两个腹板单元的预应力孔道，并初步张拉所述第二节段、所述第三节段的预应力筋；
分别吊装所述第二节段的底板单元与所述第二节段的两个腹板单元对接，所述第三节段的底板单元与所述第三节段的两个腹板单元对接，同时将所述第二节段、所述第三节段的底板单元分别与所述第一节段底板上的剪力键对接，在所述第二节段、所述第三节段的底板单元的底板单元的竖向筋孔道中穿入底板竖向筋，将每根底板竖向筋的上端与相对应的腹板竖向筋的下端的螺纹套筒的下半部螺接，并向所述底板竖向筋孔道灌浆，使相应的底板单元与腹板单元连接为整体；
分别起吊所述第二节段的顶板单元与所述第二节段的节两个腹板单元对接，所述第三节段的顶板单元与所述第三节段的节两个腹板单元对接，同时将所述第二节段、所述第三节段的顶板单元与所述第一节段的顶板单元上的剪力键对接；在所述第二节段、所述第三节段的顶板单元的竖向筋孔道中穿入顶板竖向筋，将每根顶板竖向筋的下端与相对应的腹板竖向筋的上端的螺纹套筒的上半部螺接，向所述顶板竖向筋孔道灌浆，使相应的顶板单元与腹板单元连接为整体；
对所述第二节段、所述第三节段的纵向预应力筋进行二次张拉，并对预
应力管道压浆，完成所述第二节段和第三节段安装；
(4)将所述两桥面吊机移动至所述第二节段和第三节段上，按照步骤(3)的方法依次吊装后续节段，直至桥梁合拢。
本申请在箱梁的预制装配形式上进行了创新，突破了传统的节段预制、悬臂装配方法的局限，本申请的箱梁结构与现有技术相比具有以下优点：
1、结构模块全部采用工厂预制、现场拼装，工厂化率100％，可大大提高施工质量和施工速度；
2、可大幅度减小预制构件的尺寸和吊装重量，预制、存储、运输、吊装设备的型号和功率要求低，可减少大型设备的投入，降低机械费；
3、通过对变截面箱梁节段的重新分割、排版，可将大部分单元设计为通用板单位，减少模板型号，便于施工质量控制；
4、板单元可以多层堆码存储，节约存储台座和场地；
5、各分片吊装时通过张拉预应力钢筋以提高架设效率，不需要等待接缝混凝土达到强度即可施工，施工速度快。
6、预制期间不需要测量塔和节段复位的反复测量，节省测量成本；
7、作业人员数量减少，可节约人工费成本。
为了实现上述以及相关目的，本发明的一个或多个方面包括后面将详细说明的特征。下面的说明以及附图详细说明了本发明的某些示例性方面。然而，这些方面指示的仅仅是可使用本发明的原理的各种方式中的一些方式。此外，本发明旨在包括所有这些方面以及它们的等同物。
通过参考以下结合附图的说明，并且随着对本发明的更全面理解，本发明的其它目的及结果将更加明白及易于理解。在附图中：
图1是本申请的分片装配式变截面箱梁的整体结构示意图；
图2是分片装配式变截面箱梁的分解结构立体图；
图3是分片装配式变截面箱梁的分解结构横截面图；
图4是分片装配式变截面箱梁在设置竖向筋处的横截面图；
图5是0号块的底板安装结构示意图；
图6是0号块的腹板安装结构示意图；
图7是0号块的顶板安装结构示意图；
图8是变截面箱梁的纵向预应力筋布设方式示意图；
图9是0桥面吊机的安装结构示意图；
图10是1号块的腹板吊装状态示意图；
图11是1号块的起吊安装状态示意图；
图12是1号块的顶板安装状态示意图；
图13是1号块安装完成后的状态示意图。
本申请目的的实现、功能特点及优点将结合实施例，参照附图做进一步说明。
在下面的描述中，出于说明的目的，为了提供对一个或多个实施例的全面理解，阐述了许多具体细节。然而，很明显，也可以在没有这些具体细节的情况下实现这些实施例。在其它例子中，为了便于描述一个或多个实施例，公知的结构和设备以方框图的形式示出。
在本发明的描述中，需要理解的是，术语“中心”、“纵向”、“横向”、“长度”、“宽度”、“厚度”、“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”“内”、“外”、“顺时针”、“逆时针”、“轴向”、“径向”、“周向”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本发明和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本发明的限制。
本申请提供的一种分片装配式变截面箱梁结构，包括相互装配的若干节段，每个节段均一顶板单元、两个腹板单元和一底板单元，其中，所述顶板单元的底面的两端分别与两个腹板单元的顶面相连接，所述底板单元的顶面的两端分别与所述两个腹板单元的底面对接；在所述腹板单元的内部设有纵向预应力孔道，并预埋有若干根腹板竖向筋，在每根腹板竖向筋的上下两端分别连接一螺纹套筒；在所述顶板单元的内部设有与所述腹板竖向筋对应的顶板竖向筋，每根顶板竖向筋的下端与相应的腹板竖向筋的上端螺接的螺纹套筒螺接；在所述底板单元内设有与所述腹板竖向筋对应的底板竖向筋，每根底板竖向筋的上端与相应的腹板竖向筋的下端螺接的螺纹套筒螺接。
其中，每个螺纹套筒的一端与相应的腹板竖向筋螺接，每个螺纹套筒的另一端与相应的顶板竖向筋的下端或与相应的底板竖向筋的上端螺接。
其中，在所述顶板单元的内部设有与所述顶板竖向筋相对应的顶板竖向筋孔道，所述顶板竖向筋穿设在相应的顶板竖向筋孔道内。在所述底板单元内的内部设有与所述底板竖向筋相对应的底板竖向筋孔道，所述底板竖向筋穿设在相应的底板竖向筋孔道内。
其中，在所述腹板单元的下边缘设置有缺角，所述缺角的边缘与所述底
板单元的分节位置相对应。也就是说，腹板单元下缘设置缺角，便于腹板内纵向预应力锚垫板安装和预应力张拉；底板单元的分节位置与腹板缺角边缘对齐。
其中，各个节段之间通过剪力键以及与所述剪力键相适配的剪力键插槽相互对接进行装配。在每个节段的一端面设有若干个剪力键，另一端面设置有与每个剪力键对应的剪力键插槽；其中，一个节段的剪力键与另一个节段的剪力键插槽相对接。具体地，在每个节段的所述顶板单元、腹板单元和底板单元的一端面分别设有多个剪力键，另一端面分别设有与每个剪力键对应的剪力键插槽。
本申请提供的一种分片装配式变截面箱梁结构，包括相互装配的若干节段，在图1至图4所示的实施例中，每个节段包括一顶板单元1、两个腹板单元2和一底板单元3，所述顶板单元1的底面两侧分别与两腹板单元2顶面对接，所述底板单元3的顶面的两侧分别与两个腹板单元2的底面对接；所述腹板单元2内沿桥梁纵向设有纵向预应力孔道，并预埋有多根腹板竖向筋21，每根腹板竖向筋21上下两端分别连接一螺纹套筒22，每个螺纹套筒22的一半与腹板竖向筋螺接，所述顶板单元1内设有与腹板竖向筋对应的顶板竖向筋孔道11，每个顶板竖向筋孔道中穿设一顶板竖向筋12，每根顶板竖向筋12下端与一腹板竖向筋上端螺接的螺纹套筒22的另一半螺接，所述底板单元3内设有与腹板竖向筋对应的底板竖向筋孔道31，每个底板竖向筋孔道中穿设一底板竖向筋32，每根底板竖向筋32上端与一腹板竖向筋21下端螺接的螺纹套筒22的另一半螺接。
所述顶板单元1、腹板单元2和底板单元3的前端面分别设有多个剪力键4，后端面设有与每个剪力键对应的剪力键插槽。剪力键用于承受与传递剪力，并用于协助节段拼装镶嵌对接定位。
本申请还提供一种分片装配式变截面箱梁施工方法，对上述分片装配式变截面箱梁结构进行施工，其中，所述施工方法包括以下步骤：
(1)吊装箱梁的第一节段：
将所述第一节段的底板单元吊装到墩柱上，并将底板竖向筋插入到相应的底板竖向筋孔道中；
将所述第一节段的两个腹板单元吊装到所述第一节段的底板单元的两端进行对接，将每根底板竖向筋的上端与相对应的腹板竖向筋的下端的螺纹套筒的下半部螺接，向所述底板竖向筋孔道内灌浆，同时在所述两个腹板单元之间安装中隔板；
将所述第一节段的顶板吊放到所述两个腹板单元上，并将顶板竖向筋插入顶板竖向筋孔道中，将每根顶板竖向筋的下端与相对应的腹板竖向筋的上
端的螺纹套筒的上半部螺接，并向所述顶板竖向筋孔道灌浆；
将预应力筋插入到所述腹板单元的纵向预应力孔道中，并进行第一次张拉，完成所述箱梁的所述第一节段安装；
(2)在所述箱梁的第一节段的顶板单元的两端分别安装桥面吊机；
(3)采用所述桥面吊机吊装第二节段和第三节段，所述第二节段和第三节段对称吊装在所述第一节段的两端：
分别吊装所述第二节段、所述第三节段的两个腹板单元，将所述第二节段、所述第三节段的腹板单元分别与所述第一节段的腹板单元通过剪力键和剪力键插槽对接，同时将相应的纵向预应力筋穿入所述第二节段、所述第三节段的两个腹板单元的预应力孔道，并初步张拉所述第二节段、所述第三节段的预应力筋；
分别吊装所述第二节段的底板单元与所述第二节段的两个腹板单元对接，所述第三节段的底板单元与所述第三节段的两个腹板单元对接，同时将所述第二节段、所述第三节段的底板单元分别与所述第一节段底板上的剪力键对接，在所述第二节段、所述第三节段的底板单元的底板单元的竖向筋孔道中穿入底板竖向筋，将每根底板竖向筋的上端与相对应的腹板竖向筋的下端的螺纹套筒的下半部螺接，并向所述底板竖向筋孔道灌浆，使相应的底板单元与腹板单元连接为整体；
分别起吊所述第二节段的顶板单元与所述第二节段的节两个腹板单元对接，所述第三节段的顶板单元与所述第三节段的节两个腹板单元对接，同时将所述第二节段、所述第三节段的顶板单元与所述第一节段的顶板单元上的剪力键对接；在所述第二节段、所述第三节段的顶板单元的竖向筋孔道中穿入顶板竖向筋，将每根顶板竖向筋的下端与相对应的腹板竖向筋的上端的螺纹套筒的上半部螺接，向所述顶板竖向筋孔道灌浆，使相应的顶板单元与腹板单元连接为整体；
对所述第二节段、所述第三节段的纵向预应力筋进行二次张拉，并对预应力管道压浆，完成所述第二节段和第三节段安装；
(4)将所述两桥面吊机移动至所述第二节段和第三节段上，按照步骤(3)的方法依次吊装后续节段，直至桥梁合拢。
在本申请的图1至图13所示的实施例中，0#块相当于第一节段，两个1#节段相当于第二节段和第三节段，上述分片装配式变截面箱梁，具体施工方式如下：
(1)根据图2、图4所示的结构，将每个箱梁节段划分为一顶板单元1、两个腹板单元2和一底板单元3，顶板单元、腹板单元和底板单元的分割位置位于箱室的倒角边缘；
在预制场加工顶板单元、腹板单元和底板单元，每个腹板单元2内内沿桥梁纵向设有纵向预应力孔道，并按照箱梁的竖向筋布局预埋多根腹板竖向筋21，每根腹板竖向筋上下两端分别螺接一螺纹套筒22，每个螺纹套筒的一半与腹板竖向筋螺接；每个顶板单元1内对应两腹板单元的每根腹板竖向筋设置一顶板竖向筋孔道11，每个底板单元3内对应两腹板单元的每根竖向筋预留一底板竖向筋孔道31；每个顶板单元、腹板单元和底板单元的前端面预设多个剪力键4，后端面预设对应的剪力键插槽；
腹板单元预制时，在腹板单元下缘设置缺角，便于腹板内纵向预应力锚垫板安装和预应力张拉；底板单元的分节位置与腹板缺角边缘对齐。
所有顶板单元、腹板单元和底板单元预制完成后运至桥梁施工现场；
(2)吊装箱梁0#块：
如图5所示，用汽车吊将0#块底板3吊装到墩柱7上，在每个底板竖向筋孔道31中插入底板竖向筋；
如图6所示，将两0#块腹板2起吊到底板上方，将每根底板竖向筋上端与一腹板竖向筋下端的螺纹套筒的下半部螺接，将两腹板下放到底板上，同时对底板竖向筋孔道内灌浆，并在两腹板间安装中隔板；
如图7所示，将0#块顶板1吊放到两腹板2上，在每个顶板竖向筋孔道中插入顶板竖向筋，将每根顶板竖向筋下端与腹板竖向筋上端螺接的螺纹套筒的上半部螺接，并对顶板竖向筋孔道灌浆；最后在腹板单元的纵向预应力孔道中穿设预应力筋并进行第一次张拉，完成0#块箱梁安装。
如图8所示，本申请的纵向预应力筋设置方式与普通短线法节段预制悬臂拼装法相同，纵向预应力筋5沿桥纵向穿设在各块段的腹板中，在此不赘述。
(3)如图9所示，在0#块顶面两端安装两个桥面吊机6；
(4)采用桥面吊机对称吊装两个1#节段：
如图10所示，首先吊装1#节段的两腹板单元2，将1#节段腹板与0#块腹板通过剪力键和剪力键插槽对接，同时将纵向预应力筋穿入1#节段腹板的预应力孔道，并初步张拉1#节段预应力筋；
如图11所示，起吊1#节段的底板单元3与1#节段的两腹板2对接，同时与0#块底板上的剪力键对接，按照图3、图4所示的结构在底板单元的竖向筋孔道31中穿入底板竖向筋32，将每根底板竖向筋32上端与腹板竖向筋21下端的螺纹套筒22的下半部螺接，对底板竖向筋孔道灌浆，使底板单元与腹板单元连接为整体；
如图12所示，起吊1#节段的顶板单元1与1#节段的两腹板2对接，同时与0#块顶板上的剪力键对接；按照图3、图4所示的结构在顶板单元的竖向筋孔道11中穿入顶板竖向筋12，将每根顶板竖向筋12下端与腹板竖向筋21上端的
螺纹套筒22的上半部螺接，对顶板竖向筋孔道灌浆，使顶板单元与腹板单元连接为整体；
对1#节段的纵向预应力筋进行二次张拉，并对预应力管道压浆，完成1#节段安装；
(5)如图13所示，将两桥面吊机6前移，按照步骤(4)的方法依次吊装后续节段，直至桥梁合拢。
通过上述实施方式可以看出，本发明提供的分片装配式变截面箱梁结构及施工方法，通过将箱梁的顶板单元、底板单元、腹板单元进行板单元分片预制，并采用吊机将分片的顶板单元、底板单元、腹板单元逐个吊装、组装，此装置在预制、存储、运输、安装的设备型号小，存储场地占用小，质量易控制，施工成本低。
如上参照附图以示例的方式描述了根据本发明提出的分片装配式变截面箱梁结构及施工方法。但是，本领域技术人员应当理解，对于上述本发明所提出的分片装配式变截面箱梁结构及施工方法，还可以在不脱离本发明内容的基础上做出各种改进。因此，本发明的保护范围应当由所附的权利要求书的内容确定。
Claims (9)
- 一种分片装配式变截面箱梁结构，其中：包括相互装配的若干节段，每个节段均包括一顶板单元、两个腹板单元和一底板单元，其中，所述顶板单元的底面的两端分别与两个腹板单元的顶面相连接，所述底板单元的顶面的两端分别与所述两个腹板单元的底面对接；在所述腹板单元的内部设有纵向预应力孔道，并预埋有若干根腹板竖向筋，在每根腹板竖向筋的上下两端分别连接一螺纹套筒；在所述顶板单元的内部设有与所述腹板竖向筋对应的顶板竖向筋，每根顶板竖向筋的下端与相应的腹板竖向筋的上端螺接的螺纹套筒螺接；在所述底板单元内设有与所述腹板竖向筋对应的底板竖向筋，每根底板竖向筋的上端与相应的腹板竖向筋的下端螺接的螺纹套筒螺接。
- 根据权利要求1所述的分片装配式变截面箱梁结构，其中：每个螺纹套筒的一端与相应的腹板竖向筋螺接，每个螺纹套筒的另一端与相应的顶板竖向筋的下端或与相应的底板竖向筋的上端螺接。
- 根据权利要求1所述的分片装配式变截面箱梁结构，其中：在所述顶板单元的内部设有与所述顶板竖向筋相对应的顶板竖向筋孔道，所述顶板竖向筋穿设在相应的顶板竖向筋孔道内。
- 根据权利要求1所述的分片装配式变截面箱梁结构，其中：在所述底板单元内的内部设有与所述底板竖向筋相对应的底板竖向筋孔道，所述底板竖向筋穿设在相应的底板竖向筋孔道内。
- 根据权利要求1所述的分片装配式变截面箱梁结构，其中：在所述腹板单元的下边缘设置有缺角，所述缺角的边缘与所述底板单元的分节位置相对应。
- 根据权利要求1所述的分片装配式变截面箱梁结构，其中：各个节段之间通过剪力键以及与所述剪力键相适配的剪力键插槽相互对接进行装配。
- 根据权利要求6所述的分片装配式变截面箱梁结构，其中：在每个节段的一端面设有若干个剪力键，另一端面设置有与每个剪力键对应的剪力键插槽；其中，一个节段的剪力键与另一个节段的剪力键插槽相对接。
- 根据权利要求7所述的分片装配式变截面箱梁结构，其中：在每个节段的所述顶板单元、腹板单元和底板单元的一端面分别设有多个剪力键，另一端面分别设有与每个剪力键对应的剪力键插槽。
- 一种分片装配式变截面箱梁施工方法，对如权利要求1-8任一项所述的分片装配式变截面箱梁结构进行施工，其中，所述施工方法包括以下步骤：(1)吊装箱梁的第一节段：将所述第一节段的底板单元吊装到墩柱上，并将底板竖向筋插入到相应的底板竖向筋孔道中；将所述第一节段的两个腹板单元吊装到所述第一节段的底板单元的两端进行对接，将每根底板竖向筋的上端与相对应的腹板竖向筋的下端的螺纹套筒的下半部螺接，向所述底板竖向筋孔道内灌浆，同时在所述两个腹板单元之间安装中隔板；将所述第一节段的顶板吊放到所述两个腹板单元上，并将顶板竖向筋插入顶板竖向筋孔道中，将每根顶板竖向筋的下端与相对应的腹板竖向筋的上端的螺纹套筒的上半部螺接，并向所述顶板竖向筋孔道灌浆；将预应力筋插入到所述腹板单元的纵向预应力孔道中，并进行第一次张拉，完成所述箱梁的所述第一节段安装；(2)在所述箱梁的第一节段的顶板单元的两端分别安装桥面吊机；(3)采用所述桥面吊机吊装第二节段和第三节段，所述第二节段和第三节段对称吊装在所述第一节段的两端：分别吊装所述第二节段、所述第三节段的两个腹板单元，将所述第二节 段、所述第三节段的腹板单元分别与所述第一节段的腹板单元通过剪力键和剪力键插槽对接，同时将相应的纵向预应力筋穿入所述第二节段、所述第三节段的两个腹板单元的预应力孔道，并初步张拉所述第二节段、所述第三节段的预应力筋；分别吊装所述第二节段的底板单元与所述第二节段的两个腹板单元对接，所述第三节段的底板单元与所述第三节段的两个腹板单元对接，同时将所述第二节段、所述第三节段的底板单元分别与所述第一节段底板上的剪力键对接，在所述第二节段、所述第三节段的底板单元的底板单元的竖向筋孔道中穿入底板竖向筋，将每根底板竖向筋的上端与相对应的腹板竖向筋的下端的螺纹套筒的下半部螺接，并向所述底板竖向筋孔道灌浆，使相应的底板单元与腹板单元连接为整体；分别起吊所述第二节段的顶板单元与所述第二节段的节两个腹板单元对接，所述第三节段的顶板单元与所述第三节段的节两个腹板单元对接，同时将所述第二节段、所述第三节段的顶板单元与所述第一节段的顶板单元上的剪力键对接；在所述第二节段、所述第三节段的顶板单元的竖向筋孔道中穿入顶板竖向筋，将每根顶板竖向筋的下端与相对应的腹板竖向筋的上端的螺纹套筒的上半部螺接，向所述顶板竖向筋孔道灌浆，使相应的顶板单元与腹板单元连接为整体；对所述第二节段、所述第三节段的纵向预应力筋进行二次张拉，并对预应力管道压浆，完成所述第二节段和第三节段安装；(4)将所述两桥面吊机移动至所述第二节段和第三节段上，按照步骤(3)的方法依次吊装后续节段，直至桥梁合拢。
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| CN103233421A (zh) * | 2013-05-08 | 2013-08-07 | 重庆交通大学 | 一种预应力混凝土变截面箱梁桥及其施工方法 |
| CN105484142A (zh) * | 2015-10-30 | 2016-04-13 | 河海大学 | 一种拼装式节段预制混凝土空心板梁结构及其制作方法 |
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