WO2021147256A1 - 下跨多条铁路营业线单侧整体吊装大跨度天桥及施工方法 - Google Patents
下跨多条铁路营业线单侧整体吊装大跨度天桥及施工方法 Download PDFInfo
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- WO2021147256A1 WO2021147256A1 PCT/CN2020/100539 CN2020100539W WO2021147256A1 WO 2021147256 A1 WO2021147256 A1 WO 2021147256A1 CN 2020100539 W CN2020100539 W CN 2020100539W WO 2021147256 A1 WO2021147256 A1 WO 2021147256A1
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- flyover
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- 238000010276 construction Methods 0.000 title claims abstract description 49
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 91
- 239000010959 steel Substances 0.000 claims abstract description 91
- 230000001681 protective effect Effects 0.000 claims abstract description 25
- 238000009434 installation Methods 0.000 claims abstract description 19
- 239000011150 reinforced concrete Substances 0.000 claims abstract description 18
- 238000005034 decoration Methods 0.000 claims abstract description 4
- 239000004567 concrete Substances 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 239000004575 stone Substances 0.000 claims description 3
- 238000004078 waterproofing Methods 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims 2
- 210000005069 ears Anatomy 0.000 claims 1
- 239000000203 mixture Substances 0.000 claims 1
- 238000004904 shortening Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 10
- 239000000463 material Substances 0.000 description 3
- 230000005484 gravity Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009430 construction management Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000009417 prefabrication Methods 0.000 description 1
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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
- E01D1/00—Bridges in general
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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
- E01D19/00—Structural or constructional details of bridges
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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
- E01D19/00—Structural or constructional details of bridges
- E01D19/02—Piers; Abutments ; Protecting same against drifting ice
-
- 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
- E01D19/10—Railings; Protectors against smoke or gases, e.g. of locomotives; Maintenance travellers; Fastening of pipes or cables to bridges
- E01D19/103—Parapets, railings ; Guard barriers or road-bridges
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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
- E01D19/00—Structural or constructional details of bridges
- E01D19/12—Grating or flooring for bridges; Fastening railway sleepers or tracks to bridges
- E01D19/125—Grating or flooring for bridges
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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
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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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
- E01D6/00—Truss-type bridges
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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
- E01D2101/00—Material constitution of bridges
- E01D2101/30—Metal
Definitions
- the invention belongs to the technical field of flyovers, and in particular relates to a single-side integral hoisting large-span flyover and a construction method that spans multiple railway business lines.
- the integrally assembled large-span steel truss flyover has a large span, high cross-section, heavy weight, and the joints are welded joints, and are also constructed by existing cables.
- the project site installation is extremely difficult. If the segmented assembly method is adopted, it needs to be in the middle of the existing cables. Setting up load-bearing supports, and falling objects from high altitude will pose a danger to the railway dedicated line that is already in operation below, and the on-site engineering volume is large, the power outage window is required for a long time, it interferes with the running line, and poses a big problem for construction management; long-span steel It is difficult to hoist and accurately fix and locate the truss flyover.
- the purpose of the present invention is to overcome the deficiencies in the prior art, and provide a single-side integral hoisting large-span flyover and a construction method that has high construction efficiency, simple structure, convenient construction, low cost, energy saving and environmental protection.
- This type of single-sided integral hoisting of large-span flyovers under multiple railway business lines includes the mid-span of the flyover, the side spans of the flyover, reinforced concrete columns, fixed positioning devices and multiple railway business lines;
- the large-span flyover is for business under multiple railways Line steel truss structure, large-span flyover includes flyover middle span and flyover side span.
- the flyover middle span is fixed on the reinforced concrete column by a fixed positioning device, and the flyover side span is positioned and fixed by a fixed positioning device;
- the mid-span of the flyover includes upper chord beams, lower chord beams, corbels, diagonal web beams, vertical web beams, lifting lugs, floor beams, tie beams, roof slabs, floor decks, gutter supports and roof gutters;
- the corbels are welded to the upper chord and the lower chord respectively, and the corbels are welded with the diagonal web beam and the vertical web beam to form a single-piece side steel truss structure;
- the floor beam is the main beam on the top of the steel truss flyover, and the tie beam is the top of the steel truss flyover.
- Surface secondary beams and bottom connecting beams, floor beams and tie beams are welded with two side steel truss structures to form an integral box structure of the overpass;
- the gutter support is welded to the upper chord beam to support the roof gutter;
- the fixing and positioning device includes embedded bolts, fixed supports, upper backing plates, upper grooves, anti-skid pads, rubber backing plates, lower grooves, lower backing plates, groove ear plates and high-strength bolts;
- the positioning device and the positioning baffle are fixed on the reinforced concrete column by embedded bolts;
- the lower chord beams of the mid span of the overpass and the side span of the overpass are welded with the overpass positioning lug plate with reserved holes, and the embedded bolts pass through the reserved holes to the steel truss Positioning and fixing of the flyover;
- a number of gutter supports are welded along the length direction on both sides of the upper chord to serve as a fixed support structure for the roof gutter, and the protective fence uses the roof gutter as a template and is set on the top of the outer facade of the roof gutter; the roof gutter is Groove-shaped structure, the outer layer of the roof gutter is wrapped with steel plate, and the steel plate is filled with concrete.
- Several embedded sleeves are arranged at equal intervals in the concrete. The upper end of the embedded sleeves is exposed on the upper surface of the concrete; the protective fence is assembled
- the easy-to-disassemble temporary protective structure is mainly composed of railing posts, guardrail body, column ear plates, guardrail ear plates, high-strength bolts, limit pin plates and bolt holes; the guardrail posts are inserted into embedded sleeves.
- the upper chord beams, lower chord beams, diagonal web beams, vertical web beams and floor beams are welded box section beams;
- the tie beams are welded H-shaped steel beams;
- roof slabs are arranged between the upper chord beams,
- a floor bearing slab is arranged between the lower chord beams, and the roof slab and the floor bearing slab are a composite structure of profiled steel plate and concrete.
- the long-span steel truss flyover is integrally assembled by an assembled frame composed of longitudinal beams and transverse beams, wherein the longitudinal beams and the transverse beams are both H-shaped steel, and the longitudinal beams and the transverse beams are connected by L-shaped gaskets and high-strength bolts.
- Fixed The assembled tire frame is connected with the fixed support through expansion bolts.
- the single-piece side steel truss structure is fixed by temporary diagonal bracing;
- the temporary diagonal brace includes a first hoop, a second hoop, a hoop ear plate, a threaded sleeve and a threaded rod, wherein the first hoop and The second hoop has a groove-shaped structure.
- the first hoop and the second hoop are fixed by high-strength bolts to form a rectangular hoop covering the upper chord.
- the size of the hoop matches the size of the upper chord; the first hoop and the second ring
- the hoop is provided with a hoop ear plate, the hoop ear plate is reserved with threaded holes, the first hoop and the second hoop are connected with the threaded sleeve by high-strength bolts; the threaded sleeve and the threaded rod form a temporary diagonal brace; temporary diagonal brace It is fixed to the fixed support by expansion bolts.
- lifting lugs are provided on the top of the upper chord beam, and stiffening plates are welded at the lifting lugs to be strengthened, and an inner baffle is welded between the upper chord beam upper flange and the upper chord lower flange at the corresponding position of the lifting lugs.
- the upper groove and the lower groove are both welded with groove ear plates
- the lower backing plate and the groove ear plates are both reserved with holes
- the high-strength bolts welded on the fixed support pass through the lower backing plate and
- the reserved holes of the groove ear plate fix the lower backing plate and the lower groove
- the high-strength bolts welded on the upper backing plate pass through the groove ear plate to fix the upper groove.
- the rubber pad is placed in the space formed by the upper groove and the lower groove, and anti-skid pads are placed on the top and bottom surfaces of the rubber pad.
- the railing column is welded to the column ear plate with bolt holes, the column ear plate corresponds to the guardrail ear plate provided on the guardrail body, and the column ear plate at the lower part is higher than the upper surface of the concrete; the column ear plate and the guardrail The ear plates are fixedly connected by high-strength bolts to form the main structure of the protective fence; the railing column is inserted into the pre-embedded sleeve for a certain length, and a reserved hole is provided on the railing column for installing the limit pin plate.
- This construction method for hoisting a large-span flyover on a single side across multiple railway business lines includes the following steps:
- S3 Single-piece side truss assembly: loft, press 1/1000 middle pre-arch, weld and assemble the lower chord beam, corbel, upper chord beam, inclined web beam and vertical web beam in sequence, and the single beams that have been assembled and passed inspection and acceptance will be assembled.
- the truss should be erected by a car crane, and the car crane should not be loosened. Use temporary diagonal bracing to stabilize the single truss and loosen the hook after reaching safety;
- S7 Overpass hoisting: Lift the overpass steel truss, rotate the overpass steel truss to the installation position, use the positioning baffle to gently drop the steel truss to the position of the embedded bolts on the top of the reinforced concrete column, and adjust the space position of the steel truss synchronously and accurately.
- the steel truss and the fixed positioning device are welded in sections, and the lifting locks are removed synchronously to clean the site;
- the integrally assembled large-span steel truss flyover of the present invention adopts engineering prefabrication and is assembled on site. Finally, the large-tonnage crane hoisting scheme is used.
- the steel truss flyover is convenient to assemble and has a short installation period, which reduces the application time for the existing cable construction window and makes the upper part
- the construction changes the existing line to the non-existing line, which greatly reduces the impact on the running line, and has considerable social benefits and high promotion value.
- the present invention uses pre-embedded bolts to fix the fixing and positioning device on the reinforced concrete column.
- the positioning baffle can initially position the hoisting position.
- the fixed support and the upper pad are welded with high-strength bolts, and are connected to the upper groove and lower plate.
- the groove and the lower pad are connected.
- the present invention adopts a fabricated and easily disassembled protective fence structure, which is fixed and connected by high-strength bolts. After the project is completed, the functional design of the protective fence is optimized, and the protective fence can be reused after being removed. It has simple structure and construction The advantages of convenience and low cost can further reduce material waste.
- Figure 1 is a schematic diagram of a large-span steel truss flyover with multiple business lines underneath;
- Figure 2 is the elevation view of the integrally assembled large-span steel truss flyover
- Figure 3 is a cross-sectional view of the integrally assembled large-span steel truss flyover
- Figure 4 is a schematic diagram of integrally assembled long-span steel truss flyover assembling tire frame
- Figure 5 is a schematic diagram of the fixed connection of the assembled tire frame
- Figure 6 is a schematic diagram of temporary diagonal bracing
- Figure 7 is a large-scale drawing of the temporary diagonal brace hoop
- Figure 8 is a schematic diagram of the connection between the temporary diagonal brace hoop and the threaded sleeve
- Figure 9 is a schematic diagram of the position of the hanging points of the integrally assembled large-span steel truss flyover
- Fig. 10 is a sectional view of A-A in Fig. 8;
- Figure 11 is a schematic diagram of the fixed positioning of the steel truss flyover and the reinforced concrete column
- Figure 12 is a schematic diagram of the fixed positioning device
- Figure 13 is a schematic diagram of the protective fence structure of the permanent and temporary combination
- Figure 14 is a schematic diagram of the fixed connection between the railing post and the guardrail body.
- the single-side integral hoisting of a large-span flyover for multiple railway business lines under the lower span includes the middle span of the flyover 1, the side span of the flyover 2, the reinforced concrete column 3, the fixed positioning device 4 and multiple railway business lines 5;
- the long-span flyover It is a steel truss structure that spans multiple railway business lines 5, including flyover middle span 1 and flyover side span 2.
- the flyover middle span 1 is assembled on the ground as a whole, and then hoisted by a large-tonnage crane and fixed by a fixed positioning device 4.
- the side span 2 of the overpass is assembled by the steel truss in the construction state of the adjacent business line, and is also positioned and fixed by the fixed positioning device 4;
- the mid-span 1 of the flyover includes upper chord beam 6, lower chord beam 7, corbel 8, oblique web beam 9, vertical web beam 10, lifting lugs 11, floor beam 12, tie beam 13, roof slab 14, floor deck 15.
- the corbel 8 is welded to the upper chord 6 and the lower chord 7 respectively, and correspondingly welded with the inclined web beam 9 and the vertical web beam 10 to form a single-piece side steel truss structure;
- the floor beam 12 is the top main beam of the steel truss flyover, the tie beam 13 is the top secondary beam and the bottom connecting beam of the steel truss flyover, and the floor beam 12 and the tie beam 13 are welded to the two side steel truss structures to form the flyover Integral box structure;
- the gutter support 16 is welded to the upper chord beam 6 to provide support for the roof gutter 17;
- the fixing and positioning device 4 includes a pre-embedded bolt 37, a fixed support 22, an upper backing plate 39, an upper groove 40, an anti-skid pad 41, a rubber backing plate 42, a lower groove 43, a lower backing plate 44, and groove lugs.
- Plate 54 and high-strength bolts 25; the fixed positioning device 4 and positioning baffle 45 are fixed to the reinforced concrete column 3 by embedded bolts 37; the lower chord 7 of the mid-span 1 and the side span 2 of the overpass are welded with reserved holes
- the overpass positioning lug plate 38 is used, and the embedded bolts 37 pass through the reserved holes to position and fix the steel truss overpass;
- a number of gutter supports 16 are welded along the length direction on both sides of the upper chord beam 6 as the fixed support structure of the roof gutter 17, and the protective fence 18 uses the roof gutter 17 as a template and is set on the outer façade of the roof gutter 17
- the top; roof gutter 17 is a groove-shaped structure, the outer layer is wrapped with steel plate 19, and the steel plate 19 is filled with concrete 46.
- a number of embedded sleeves 47 are arranged at equal intervals in the concrete 46, and the upper end of the embedded sleeve 47 is exposed in the concrete 46
- the upper surface of the guardrail 18 is installed by inserting the railing post 48 into the embedded sleeve 47 to achieve.
- the upper chord beam 6, the lower chord beam 7, the diagonal web beam 9, the vertical web beam 10 and the floor beam 12 are welded box section beams;
- the tie beam 13 is a welded H-shaped steel beam;
- the upper chord beam A roof slab 14 is set between 6 and a floor deck 15 is set between the lower chord beams 7.
- the roof slab 14 and the floor deck 15 are a composite structure of 1.2mm thick profiled steel plate and concrete.
- the long-span steel truss flyover is integrally assembled by an assembled tire frame composed of longitudinal beams 20 and transverse beams 21, wherein the longitudinal beams 20 and the transverse beams 21 are both H-shaped steel, and pass L-shaped gaskets 24 and high-strength
- the bolt 25 is connected and fixed; the assembled tire frame is connected with the fixed support 22 through the expansion bolt 25.
- the temporary diagonal brace includes a first ring hoop 28, a second hoop 29, a hoop ear plate 30, a threaded sleeve 26, and a threaded rod. 27.
- the first hoop 28 and the second hoop 29 are groove-shaped and fixed by high-strength bolts 25 to form a rectangular hoop covering the upper chord 6.
- the size of the hoop matches the size of the upper chord 6; the first hoop 28 and the second hoop 29 are provided with hoop ear plates 30, the hoop ear plates 30 are reserved with threaded holes 31, the first hoop 28 and the second hoop 29 are connected with the threaded sleeve 26 by the high-strength bolt 25; The sleeve 26 and the threaded rod 27 form a temporary diagonal brace. By adjusting the position of the threaded rod 27 screwed into the threaded sleeve 26, the verticality of the single-piece side steel truss structure is adjusted; the temporary diagonal brace is fixed to the fixed support 22 by an expansion bolt 23 .
- a lifting lug 11 is provided on the top of the upper chord 6 of the long-span steel truss overpass, and the lifting lug 11 is welded with a stiffening plate 33 to strengthen it.
- the upper chord upper flange 35 and the upper chord lower at the corresponding position of the lifting lug 11 The inner baffle 34 is welded between the flanges 36; the lifting point 32 adopts a single-machine four-point lifting, because the center of gravity of the flyover is not in the geometric center of gravity, the connecting shackle is used for leveling during the lifting process.
- the upper groove 40 and the lower groove 43 are both welded with a groove ear plate 54, and the lower backing plate 44 and the groove ear plate 54 are both reserved with holes, and the high-strength bolts are welded to the fixed support 22 25 passes through the reserved holes of the lower backing plate 44 and the groove ear plate 54 to fix the lower backing plate 44 and the lower groove 43; the high-strength bolt 25 welded on the upper backing plate 39 passes through the groove ear plate 54 to be aligned The groove 40 is fixed.
- the rubber pad 42 is placed in the space formed by the upper groove 40 and the lower groove 43, and anti-slip pads 41 are placed on the top and bottom surfaces of the rubber pad 42.
- the protective fence 18 is an assembled and easily disassembled temporary protective structure, including a railing post 48, a guardrail body 49, a post ear plate 50, a guardrail ear plate 51, a high-strength bolt 25, a limit pin plate 52, and a bolt hole 53
- the railing column 48 is welded with two sets of column ear plates 50 with reserved bolt holes 53.
- the two sets of column ear plates 50 correspond to the guardrail ear plates 51 provided on the guardrail body 49, and the lower column ear plates 50 are slightly higher than
- the upper surface of the concrete 46 facilitates the later removal of the guardrail 18;
- the column ear plate 50 and the guardrail ear plate 51 are fixedly connected by high-strength bolts 25 to form the main structure of the guardrail 18;
- the railing post 48 is inserted into the embedded sleeve 47 for a certain length,
- a reserved hole is provided on the railing post 48 for installing the limit pin plate 52 to limit the insertion depth of the railing post 48.
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Abstract
Description
Claims (9)
- 一种下跨多条铁路营业线单侧整体吊装大跨度天桥,其特征在于:包括天桥中跨(1)、天桥边跨(2)、钢筋混凝土立柱(3)、固定定位装置(4)和多条铁路营业线(5);大跨度天桥为下跨多条铁路营业线(5)的钢桁架结构,大跨度天桥包括天桥中跨(1)和天桥边跨(2),天桥中跨(1)通过固定定位装置(4)固定在钢筋混凝土立柱(3)上,天桥边跨(2)通过固定定位装置(4)进行定位固定;所述的天桥中跨(1)包括上弦梁(6)、下弦梁(7)、牛腿(8)、斜腹梁(9)、竖腹梁(10)、吊耳(11)、楼面梁(12)、系梁(13)、屋面板(14)、楼承板(15)、天沟支托(16)和屋面天沟(17);牛腿(8)分别焊接在上弦梁(6)和下弦梁(7)上,并且牛腿(8)与斜腹梁(9)和竖腹梁(10)焊接组成单片侧面钢桁架结构;所述的楼面梁(12)为钢桁架天桥顶面主梁,系梁(13)为钢桁架天桥顶面次梁和底部连接梁,楼面梁(12)和系梁(13)与两片侧面钢桁架结构焊接形成天桥整体箱型结构;所述的天沟支托(16)焊接在上弦梁(6)上以支撑屋面天沟(17);所述的固定定位装置(4)包括预埋螺栓(37)、固定支座(22)、上垫板(39)、上凹槽(40)、防滑垫(41)、橡胶垫板(42)、下凹槽(43)、下垫板(44)、凹槽耳板(54)和高强螺栓(25);所述的固定定位装置(4)和定位挡板(45)通过预埋螺栓(37)固定于钢筋混凝土立柱(3)上;天桥中跨(1)和天桥边跨(2)的下弦梁(7)焊接有预留孔洞的天桥定位耳板(38),预埋螺栓(37)穿过该预留孔洞对钢桁架天桥进行定位固定;所述的上弦梁(6)两侧沿长度方向焊接有若干天沟支托(16)作为屋面天沟(17)的固定支撑结构,防护栏(18)以屋面天沟(17)作为模板并设置在屋面天沟(17)外立面的顶部;屋面天沟(17)为凹槽形结构,屋面天沟(17)外层包裹钢板(19),钢板(19)内填充混凝土(46),混凝土(46)内等间距设置有若干个预埋套筒(47),预埋套筒(47)上端露出于混凝土(46)的上表面;所述的防护栏(18)为装配式易拆卸临时防护结构,主要由栏杆立柱(48)、护栏本体(49)、立柱耳板(50)、护栏耳板(51)、高强螺栓(25)、限位销板(52)和螺栓孔(53)组成;防护栏(18)的栏杆立柱(48)***预埋套筒(47)。
- 根据权利要求1所述的下跨多条铁路营业线单侧整体吊装大跨度天桥,其特征在于:所述的上弦梁(6)、下弦梁(7)、斜腹梁(9)、竖腹梁(10)和楼面梁(12)为焊接箱型截面梁;所述的系梁(13)为焊接H型钢梁;上弦梁(6)之间设置屋面板(14),下弦梁(7)之间设置楼承板(15),所述的屋面板(14)和楼承板(15)为压型钢板与混凝土组合结构。
- 根据权利要求1所述的下跨多条铁路营业线单侧整体吊装大跨度天桥,其特征在于:所述的大跨度钢桁架天桥采用由纵梁(20)和横梁(21)组成的拼装胎架整体拼装而成,其中纵梁(20)和横梁(21)均为H型钢,纵梁(20)与横梁(21)通过L型垫片(24)和高强螺栓(25)连接固定;所述的拼装胎架通过膨胀螺栓(25)与固定支座(22)连接。
- 根据权利要求1所述的下跨多条铁路营业线单侧整体吊装大跨度天桥,其特征在于:所述的单片侧面钢桁架结构通过临时斜撑固定;临时斜撑包括第一环箍(28)、第二环箍(29)、环箍耳板(30)、 螺纹套筒(26)和螺纹杆(27),其中第一环箍(28)和第二环箍(29)为凹槽形结构,第一环箍(28)与第二环箍(29)通过高强螺栓(25)固定成为外包上弦梁(6)的矩形环箍,环箍尺寸与上弦梁(6)尺寸相匹配;第一环箍(28)和第二环箍(29)设有环箍耳板(30),环箍耳板(30)预留有螺纹孔(31),第一环箍(28)和第二环箍(29)通过高强螺栓(25)与螺纹套筒(26)连接;螺纹套筒(26)与螺纹杆(27)形成临时斜撑;临时斜撑通过膨胀螺栓(23)固定于固定支座(22)。
- 根据权利要求1所述的下跨多条铁路营业线单侧整体吊装大跨度天桥,其特征在于:所述上弦梁(6)顶部设置有吊耳(11),吊耳(11)处焊接加劲板(33)加强,在吊耳(11)对应位置处的上弦梁上翼缘(35)和上弦梁下翼缘(36)间焊接有内隔板(34)。
- 根据权利要求1所述的下跨多条铁路营业线单侧整体吊装大跨度天桥,其特征在于:所述的上凹槽(40)和下凹槽(43)均焊接有凹槽耳板(54),下垫板(44)和凹槽耳板(54)均预留有孔洞,焊接在固定支座(22)上的高强螺栓(25)穿过下垫板(44)和凹槽耳板(54)的预留孔洞对下垫板(44)和下凹槽(43)进行固定;焊接在上垫板(39)上的高强螺栓(25)穿过凹槽耳板(54)对上凹槽(40)进行固定。
- 根据权利要求1所述的下跨多条铁路营业线单侧整体吊装大跨度天桥,其特征在于:所述的橡胶垫板(42)放置于由上凹槽(40)和下凹槽(43)所构成的空间内,橡胶垫板(42)的顶面和底面均放置防滑垫(41)。
- 根据权利要求1所述的下跨多条铁路营业线单侧整体吊装大跨度天桥,其特征在于:栏杆立柱(48)焊接预留有螺栓孔(53)的立柱耳板(50),立柱耳板(50)与护栏本体(49)上设置的护栏耳板(51)相对应,且位于下部的立柱耳板(50)高于混凝土(46)的上表面;立柱耳板(50)和护栏耳板(51)通过高强螺栓(25)固定连接,构成防护栏(18)的主体结构;栏杆立柱(48)***到预埋套筒(47)一定长度,且在栏杆立柱(48)上设置有预留孔用于安装限位销板(52)。
- 一种如权利要求1所述的下跨多条铁路营业线单侧整体吊装大跨度天桥的施工方法,其特征在于,包括以下步骤:S1:施工准备:场地硬化处理,原材料进场,测量放线,施工支撑钢桁架天桥的钢筋混凝土立柱(3),安装固定定位装置(4);S2:搭设拼装胎架:根据施工图尺寸,用型钢制作拼装胎架的纵梁(20)和横梁(21),用水平仪器找平;S3:单片侧面桁架拼装:放样,按1/1000中间预起拱,依次焊接拼装下弦梁(7)、牛腿(8)、上弦梁(6)、斜腹梁(9)和竖腹梁(10),将拼装完成且经检查验收合格的单榀桁架用汽车吊吊装立起,汽车吊不松吊,用临时斜撑对单榀桁架进行稳固,达到安全后松钩;S4:继续拼装另一侧单榀桁架,然后用汽车吊将该榀钢桁架吊装立起,不松吊,用临时斜撑对单榀桁架进行稳固,达到安全后松钩;S5:用汽车吊依次拼装两榀桁架之间底部和顶部的楼面梁(12)和系梁(13),形成空间稳定结构体系后,拆除临时斜撑;S6:附属结构工程施工:主体工程验收完成后,依次铺设楼承板(15)、屋面板(14)、屋面天沟(17)及防护栏(18)、幕墙骨架、上部铝单板及百叶和下部钢板,将整个天桥形成一个封闭体系;S7:天桥吊装:起吊天桥钢桁架,将天桥钢桁架旋转至安装位置,利用定位挡板(45),将钢桁架平缓落位至钢筋混凝土立柱(3)顶部的预埋螺栓(37)位置,同步精确调整钢桁架空间位置,将钢桁架与固定定位装置(4)进行段焊连接,同步摘除吊装锁具,清理现场;S8:两侧的天桥边跨(2)钢桁架拼装:在邻近营业线施工状态下,采用散拼方式完成剩余两侧的天桥边跨(2)钢结构的安装;S9:剩余装修安装工程施工:施工楼承板(15)、屋面板(14)混凝土浇筑,屋面防水,幕墙玻璃安装,天桥内部吊顶和石材地面施工;S10:拆除天桥装配式临时防护栏。
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