CN111254796A - Single-side integral hoisting long-span overbridge for multiple railway business lines and construction method - Google Patents
Single-side integral hoisting long-span overbridge for multiple railway business lines and construction method Download PDFInfo
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- CN111254796A CN111254796A CN202010061861.6A CN202010061861A CN111254796A CN 111254796 A CN111254796 A CN 111254796A CN 202010061861 A CN202010061861 A CN 202010061861A CN 111254796 A CN111254796 A CN 111254796A
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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
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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
- E01D19/10—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
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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
- 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
Abstract
The invention relates to a single-side integral hoisting long-span overpass for a plurality of railway business lines, which comprises an overpass midspan, an overpass side span, a reinforced concrete upright post, a fixed positioning device and a plurality of railway business lines; the large-span overline bridge is a steel truss structure for striding a plurality of railway business lines, and the large-span overline bridge comprises an overline bridge midspan and an overline bridge side span, wherein the overline bridge midspan is fixed on the reinforced concrete stand column through a fixed positioning device, and the overline bridge side span is fixed through the fixed positioning device. The invention has the beneficial effects that: the integrally assembled long-span steel truss overline bridge is prefabricated by engineering, integrally assembled on site and finally hoisted by a large-tonnage crane, so that the steel truss overline bridge is convenient to assemble, the installation period is short, the application time of the construction window of the existing line is shortened, the upper construction is changed into the existing line to be the non-existing line, the influence on the operation line is greatly reduced, and the integrally assembled long-span steel truss overline bridge has considerable social benefits and higher popularization value.
Description
Technical Field
The invention belongs to the technical field of overbridge, and particularly relates to a single-side integral hoisting long-span overbridge for multiple underpass railway business lines and a construction method.
Background
In recent years, with the rapid development of national railways, the passing amount of trains is larger and larger, the original station can not receive a plurality of trains for stopping at the same time, and the number of stations can not meet the requirement. In order to solve the problem, stations in the whole country expand original stations, and meanwhile, normal operation of station yards is guaranteed. The pedestrian overpass for crossing a plurality of railway business lines downwards usually selects a large span because of large railway traffic flow, complex surrounding environment and few selectable pier stud positions, and simultaneously, in order to ensure the normal operation of railway trains, the allowed construction time for crossing the business lines is short, and the integral hoisting mode is usually adopted.
The integrally assembled long-span steel truss overpass has the advantages of large span, high section and heavy weight, the nodes are welded nodes and are constructed by the existing line, the field installation difficulty of the project is very high, if a fragment and subsection assembling method is adopted, a bearing support needs to be erected in the middle of the existing line, high-altitude falling objects can form danger to the special line of the railway which is operated below, the field engineering quantity is large, the power failure window time is required to be long, the interference to the operation line is large, and the construction management is greatly difficult; the hoisting and accurate fixed positioning difficulty of the large-span steel truss overline bridge is large, the operation line is seriously influenced if the hoisting is improper, and adverse influence is also generated on the stability and the safety of the steel truss overline bridge. Meanwhile, the steel truss overpass may have the falling of reinforcing steel bars, sharp objects, concrete materials and the like in integral hoisting and subsequent engineering construction, and further causes damages to operation lines and constructors and the like under the overpass, so that protective guards need to be arranged to meet the requirements of safety protection.
In view of this, aiming at the defects in the construction process of the traditional pedestrian overpass, a single-side integral hoisting long-span overpass and a construction method for multiple railway business lines are urgently needed, the purposes of reducing the on-site assembling difficulty of the steel truss overpass, improving the construction quality and efficiency, reducing the application time of the construction window of the existing line are achieved, and the safety and the accuracy of hoisting the long-span steel truss overpass are ensured.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a single-side integral hoisting long-span overbridge spanning multiple railway business lines and a construction method thereof, wherein the single-side integral hoisting long-span overbridge is high in construction efficiency, simple in structure, convenient to construct, low in cost, energy-saving and environment-friendly.
The single-side integral hoisting long-span overpass with the multiple railway business lines spanning downwards comprises an overpass midspan, an overpass side span, reinforced concrete columns, a fixed positioning device and multiple railway business lines; the large-span overline bridge is a steel truss structure which spans a plurality of railway business lines downwards, and comprises an overline bridge midspan and an overline bridge side span, wherein the overline bridge midspan is fixed on the reinforced concrete upright post through a fixed positioning device, and the overline bridge side span is positioned and fixed through the fixed positioning device;
the midspan of the platform bridge comprises an upper chord beam, a lower chord beam, a bracket, an inclined web beam, a vertical web beam, a lifting lug, a floor beam, a tie beam, a roof panel, a floor bearing plate, a gutter support and a roof gutter; the bracket is welded on the upper chord beam and the lower chord beam respectively, and the bracket, the oblique web beam and the vertical web beam are welded to form a single-piece side steel truss structure; the floor beam is a main beam on the top surface of the steel truss overline bridge, the tie beams are a secondary beam on the top surface of the steel truss overline bridge and a bottom connecting beam, and the floor beam and the tie beams are welded with two steel truss structures on the side surfaces to form an integral box-type structure of the overline bridge; the gutter support is welded on the upper chord beam to support the roof gutter;
the fixed positioning device comprises an embedded bolt, a fixed support, an upper base plate, an upper groove, an anti-slip pad, a rubber base plate, a lower groove, a lower base plate, a groove lug plate and a high-strength bolt; the fixed positioning device and the positioning baffle are fixed on the reinforced concrete upright post through the embedded bolt; the lower chord beams of the overpass midspan and the overpass side span are welded with overpass positioning lug plates with reserved holes, and the embedded bolts penetrate through the reserved holes to position and fix the steel truss overpass;
a plurality of gutter brackets are welded on two sides of the upper chord beam along the length direction and used as fixed supporting structures of roof gutter, and the guard rail takes the roof gutter as a template and is arranged on the top of the outer vertical surface of the roof gutter; the roof gutter is of a groove-shaped structure, a steel plate wraps the outer layer of the roof gutter, concrete is filled in the steel plate, a plurality of embedded sleeves are arranged in the concrete at equal intervals, and the upper ends of the embedded sleeves are exposed out of the upper surface of the concrete; the guard rail is an assembled type temporary protection structure which is easy to disassemble and mainly comprises a guard rail upright post, a guard rail body, upright post ear plates, guard rail ear plates, high-strength bolts, limiting pin plates and bolt holes; the railing post of the guard railing is inserted into the embedded sleeve.
Preferably, the method comprises the following steps: the upper chord beam, the lower chord beam, the oblique web beam, the vertical web beam and the floor beam are welded box-shaped section beams; the tie beam is a welded H-shaped steel beam; a roof panel is arranged between the upper chord beams, a floor bearing plate is arranged between the lower chord beams, and the roof panel and the floor bearing plate are of a profiled steel sheet and concrete combined structure.
Preferably, the method comprises the following steps: the long-span steel truss overpass is formed by integrally assembling an assembling jig frame consisting 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 fixedly connected through L-shaped gaskets and high-strength bolts; the assembling jig frame is connected with the fixed support through expansion bolts.
Preferably, the method comprises the following steps: the single-piece side steel truss structure is fixed through a temporary inclined strut; the temporary diagonal brace comprises 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 are groove-shaped structures, the first hoop and the second hoop are fixed into a rectangular hoop wrapped with the upper chord beam through high-strength bolts, and the size of the hoops is matched with that of the upper chord beam; the first hoop and the second hoop are provided with hoop ear plates, threaded holes are reserved in the hoop ear plates, and the first hoop and the second hoop are connected with the threaded sleeve through high-strength bolts; the threaded sleeve and the threaded rod form a temporary inclined strut; the temporary inclined strut is fixed on the fixed support through an expansion bolt.
Preferably, the method comprises the following steps: the top of the upper chord beam is provided with a lifting lug, the lifting lug is welded with a stiffening plate for reinforcement, and an inner baffle plate is welded between the upper flange of the upper chord beam and the lower flange of the upper chord beam at the corresponding position of the lifting lug.
Preferably, the method comprises the following steps: the upper groove and the lower groove are both welded with groove lug plates, holes are reserved on the lower backing plate and the groove lug plates, and the high-strength bolt welded on the fixed support penetrates through the reserved holes of the lower backing plate and the groove lug plates to fix the lower backing plate and the lower groove; the high-strength bolt welded on the upper backing plate penetrates through the groove lug plate to fix the upper groove.
Preferably, the method comprises the following steps: the rubber pad plate is placed in a space formed by the upper groove and the lower groove, and the top surface and the bottom surface of the rubber pad plate are both provided with anti-skid pads.
Preferably, the method comprises the following steps: the guardrail post is welded with a post ear plate with a reserved bolt hole, the post ear plate corresponds to the guardrail ear plate arranged on the guardrail body, and the post ear plate positioned at the lower part is higher than the upper surface of the concrete; the upright post ear plates and the guardrail ear plates are fixedly connected through high-strength bolts to form a main body structure of the guardrail; the railing post is inserted into the pre-buried sleeve for a certain length, and a preformed hole is formed in the railing post and used for installing a limiting pin plate.
The construction method for integrally hoisting the large-span overbridge on one side of the lower-span multiple railway business lines comprises the following steps:
s1: construction preparation: hardening the field, entering raw materials, measuring and setting out, constructing a reinforced concrete upright post for supporting the steel truss overpass, and installing a fixed positioning device;
s2: building an assembly jig frame: according to the size of a construction drawing, longitudinal beams and transverse beams of the assembled jig frame are made of profile steel, and leveling is carried out by a horizontal instrument;
s3: assembling the single-piece side truss: lofting, pre-arching according to 1/1000, sequentially welding and assembling a lower chord beam, a bracket, an upper chord beam, an oblique web beam and a vertical web beam, hoisting and erecting the assembled single truss which is qualified through inspection and acceptance by using a truck crane, enabling the truck crane not to be loose, stabilizing the single truss by using a temporary diagonal brace, and loosening the hook after safety is achieved;
s4: continuously splicing the single truss on the other side, hoisting the single truss by using a truck crane without loosening, and stabilizing the single truss by using a temporary inclined strut to achieve safety and then loosening a hook;
s5: sequentially splicing floor beams and tie beams at the bottom and the top between two trusses by using a truck crane to form a space stable structure system, and then removing temporary inclined struts;
s6: construction of auxiliary structural engineering: after the main engineering acceptance is finished, laying a floor bearing plate, a roof panel, a roof gutter, a protective guard, a curtain wall framework, an upper aluminum single plate, a shutter and a lower steel plate in sequence, and forming a closed system for the whole overpass;
s7: hoisting the overbridge: hoisting an overpass steel truss, rotating the overpass steel truss to an installation position, gently positioning the steel truss to a position of a pre-embedded bolt at the top of a reinforced concrete upright column by using a positioning baffle, synchronously and accurately adjusting the spatial position of the steel truss, connecting the steel truss with a fixed positioning device in a welding manner, synchronously removing a hoisting lock and cleaning the site;
s8: assembling the overpass side span steel trusses on two sides: in the construction state of the adjacent business line, the installation of the overpass edge-span steel structures on the two remaining sides is completed by adopting a loose splicing mode;
s9: and (3) residual decoration and installation engineering construction: constructing a floor bearing plate and a roof plate, pouring concrete, preventing water on the roof, installing curtain wall glass, and constructing a ceiling and a stone ground inside an overpass;
s10: and (4) dismantling the overpass assembled temporary protective guard.
The invention has the beneficial effects that:
(1) the integrally assembled long-span steel truss overline bridge is prefabricated by engineering, integrally assembled on site and finally hoisted by a large-tonnage crane, so that the steel truss overline bridge is convenient to assemble, the installation period is short, the application time of the construction window of the existing line is shortened, the upper construction is changed into the existing line to be the non-existing line, the influence on the operation line is greatly reduced, and the integrally assembled long-span steel truss overline bridge has considerable social benefits and higher popularization value.
(2) The fixing and positioning device is fixed on the reinforced concrete upright post by the aid of the embedded bolts, the positioning baffle plate can perform initial positioning on a hoisting position, the high-strength bolts are welded on the fixing support and the upper backing plate and are connected with the upper groove, the lower groove and the lower backing plate, the high-strength bolts are adjusted in fastening degree, so that the steel truss overpass can be conveniently, quickly and accurately positioned and lifted, and accurate positioning and safe fixing of the steel truss overpass are realized.
(3) The assembled easily-detachable protective guard structure is adopted, the protective guard is fixedly connected through the high-strength bolts and can be detached once after engineering is completed, so that the functional design of the protective guard is optimized, the protective guard can be repeatedly used after being detached, and the assembled easily-detachable protective guard has the advantages of simple structure, convenience in construction and low cost, and can further reduce material waste.
Drawings
FIG. 1 is a schematic view of a large-span steel truss overpass spanning multiple business lines;
FIG. 2 is an elevation view of an integrally assembled large-span steel truss overpass;
FIG. 3 is a sectional view of an integrally assembled long-span steel truss overline bridge;
FIG. 4 is a schematic view of an integrally assembled large-span steel truss overpass assembly jig frame;
FIG. 5 is a schematic view of the assembly jig frame fixedly connected;
FIG. 6 is a schematic view of a temporary brace;
FIG. 7 is a schematic view of a temporary diagonal hoop;
FIG. 8 is a schematic view of the temporary sprag hoop and threaded sleeve connection;
FIG. 9 is a schematic view of the positions of suspension points of the integrally assembled long-span steel truss overpass;
FIG. 10 is a sectional view taken along line A-A of FIG. 8;
FIG. 11 is a schematic view of the fixed positioning of the steel truss overpass and the reinforced concrete columns;
FIG. 12 is a diagrammatic view of a stationary positioning apparatus;
fig. 13 is a schematic view of a permanently bonded guard rail structure;
figure 14 is a perspective view of the fixed connection between the railing post and the guardrail body.
Description of reference numerals: 1-overbridge midspan, 2-overbridge side span, 3-reinforced concrete upright post, 4-fixed positioning device, 5-railway business line, 6-upper chord beam, 7-lower chord beam, 8-corbel, 9-diagonal web beam, 10-vertical web beam, 11-lifting lug, 12-floor beam, 13-tie beam, 14-roof plate, 15-floor bearing plate, 16-gutter support, 17-roof gutter, 18-protective guard, 19-steel plate, 20-longitudinal beam, 21-cross beam, 22-fixed support, 23-expansion bolt, 24-L-shaped gasket, 25-high-strength bolt, 26-threaded sleeve, 27-threaded rod, 28-first hoop, 29-second hoop, 30-hoop ear plate, 31-threaded hole, 32-hanging points, 33-stiffening plates, 34-inner partition plates, 35-upper chord beam upper flanges, 36-upper chord beam lower flanges, 37-embedded screws, 38-overpass positioning lug plates, 39-upper backing plates, 40-upper grooves, 41-anti-skidding pads, 42-rubber backing plates, 43-lower grooves, 44-lower backing plates, 45-positioning baffle plates, 46-concrete, 47-embedded sleeves, 48-guardrail columns, 49-guardrail bodies, 50-column lug plates, 51-guardrail lug plates, 52-limiting pin plates, 53-bolt holes and 54-groove lug plates.
Detailed Description
The present invention will be further described with reference to the following examples. The following examples are set forth merely to aid in the understanding of the invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
The single-side integral hoisting long-span overpass with the multiple railway business lines arranged downwards comprises an overpass midspan 1, an overpass side span 2, a reinforced concrete upright post 3, a fixed positioning device 4 and multiple railway business lines 5; the large-span overline bridge is a steel truss structure which spans a plurality of railway business lines 5 downwards and comprises an overline bridge midspan 1 and overline bridge side spans 2, wherein the overline bridge midspan 1 is integrally assembled on the ground, is hoisted by using a large-tonnage crane and is fixed on a reinforced concrete upright post 3 through a fixed positioning device 4, and the overline bridge side spans 2 are assembled by steel trusses under the construction state of adjacent business lines and are also positioned and fixed through the fixed positioning device 4;
the overpass midspan 1 comprises an upper chord girder 6, a lower chord girder 7, a bracket 8, an inclined web girder 9, a vertical web girder 10, a lifting lug 11, a floor girder 12, a tie beam 13, a roof panel 14, a floor bearing plate 15, a gutter support 16 and a roof gutter 17; the corbels 8 are respectively welded on the upper chord beam 6 and the lower chord beam 7 and correspondingly welded with the oblique web beam 9 and the vertical web beam 10 to form a single-piece side steel truss structure; the floor beam 12 is a main beam on the top surface of the steel truss overpass, the tie beam 13 is a secondary beam on the top surface of the steel truss overpass and a connecting beam at the bottom of the steel truss overpass, and the floor beam 12, the tie beam 13 and the two steel truss structures on the side surfaces are welded to form an integral box-type structure of the overpass; the gutter bracket 16 is welded on the upper chord beam 6 and provides support for the roof gutter 17;
the fixed positioning device 4 comprises embedded bolts 37, a fixed support 22, an upper backing plate 39, an upper groove 40, a non-slip mat 41, a rubber backing plate 42, a lower groove 43, a lower backing plate 44, a groove lug plate 54 and a high-strength bolt 25; the fixed positioning device 4 and the positioning baffle 45 are fixed on the reinforced concrete upright post 3 through the embedded bolt 37; the lower chord beams 7 of the overpass midspan 1 and the overpass side span 2 are welded with an overpass positioning lug plate 38 with reserved holes, and the embedded bolts 37 penetrate through the reserved holes to position and fix the steel truss overpass;
a plurality of gutter brackets 16 are welded on two sides of the upper chord beam 6 along the length direction and used as fixed supporting structures of roof gutter 17, and guard rails 18 are arranged on the tops of the outer vertical surfaces of the roof gutter 17 by taking the roof gutter 17 as a template; the roof gutter 17 is of a groove-shaped structure, the outer layer of the roof gutter 17 is wrapped by a steel plate 19, concrete 46 is filled in the steel plate 19, a plurality of embedded sleeves 47 are arranged in the concrete 46 at equal intervals, and the upper ends of the embedded sleeves 47 are exposed out of the upper surface of the concrete 46; the guard rail 18 is installed by inserting the rail post 48 into the pre-buried sleeve 47.
Furthermore, the upper chord beam 6, the lower chord beam 7, the oblique web beam 9, the vertical web beam 10 and the floor beam 12 are welded box-shaped section beams; the tie beam 13 is a welded H-shaped steel beam; a roof panel 14 is arranged between the upper chord beams 6, a floor bearing plate 15 is arranged between the lower chord beams 7, and the roof panel 14 and the floor bearing plate 15 are of a 1.2mm thick profiled steel plate and concrete combined structure.
Furthermore, the long-span steel truss overpass is formed by integrally assembling an assembling jig frame consisting of longitudinal beams 20 and transverse beams 21, wherein the longitudinal beams 20 and the transverse beams 21 are both H-shaped steel and are connected and fixed through L-shaped gaskets 24 and high-strength bolts 25; the assembled jig frame is connected with the fixed support 22 through an expansion bolt 25.
Furthermore, the single-piece side steel truss structure is fixed by adopting a temporary inclined strut after being assembled; the temporary diagonal bracing comprises a first hoop 28, a second hoop 29, hoop ear plates 30, a threaded sleeve 26 and a threaded rod 27, wherein the first hoop 28 and the second hoop 29 are groove-shaped structures and are fixed into rectangular hoops wrapped with the upper chord beam 6 through high-strength bolts 25, and the sizes of the hoops are matched with the size of the upper chord beam 6; the first hoop 28 and the second hoop 29 are provided with hoop ear plates 30, threaded holes 31 are reserved in the hoop ear plates 30, and the first hoop 28 and the second hoop 29 are connected with the threaded sleeve 26 through high-strength bolts 25; the threaded sleeve 26 and the threaded rod 27 form a temporary inclined strut, and the perpendicularity of the single-piece side steel truss structure is adjusted by adjusting the position of screwing the threaded rod 27 into the threaded sleeve 26; the temporary diagonal brace is fixed to the fixing bracket 22 by the expansion bolt 23.
Furthermore, lifting lugs 11 are arranged at the top of the upper chord beam 6 of the large-span steel truss overpass, stiffening plates 33 are welded at the lifting lugs 11 for reinforcement, and meanwhile, an inner partition plate 34 is welded between an upper flange 35 of the upper chord beam and a lower flange 36 of the upper chord beam at the corresponding position of the lifting lugs 11; the hoisting point 32 adopts single machine four-point hoisting, and because the gravity center of the overpass is not at the geometric gravity center, the connection shackle is adopted to carry out leveling treatment in the hoisting process.
Further, the upper groove 40 and the lower groove 43 are both welded with groove lug plates 54, holes are reserved in the lower cushion plate 44 and the groove lug plates 54, and the high-strength bolt 25 welded on the fixed support 22 penetrates through the reserved holes in the lower cushion plate 44 and the groove lug plates 54 to fix the lower cushion plate 44 and the lower groove 43; the high-strength bolts 25 welded to the upper shim plate 39 pass through the groove lugs 54 to secure the upper groove 40.
Further, the rubber pad 42 is placed in the space formed by the upper groove 40 and the lower groove 43, and the anti-skid pad 41 is placed on both the top surface and the bottom surface of the rubber pad 42.
Further, the guard rail 18 is an assembled type temporary protective structure which is easy to detach and comprises a guard rail upright post 48, a guard rail body 49, upright post ear plates 50, guard rail ear plates 51, high-strength bolts 25, limiting pin plates 52 and bolt holes 53; the guardrail post 48 is welded with two sets of post ear plates 50 provided with bolt holes 53, the two sets of post ear plates 50 correspond to guardrail ear plates 51 arranged on the guardrail body 49, and the post ear plate 50 positioned at the lower part is slightly higher than the upper surface of the concrete 46, so that the guardrail 18 can be conveniently removed at the later stage; the upright post ear plate 50 and the guardrail ear plate 51 are fixedly connected through a high-strength bolt 25 to form a main body structure of the guardrail 18; the railing post 48 is inserted into the embedded sleeve 47 for a certain length, and a prepared hole is arranged on the railing post 48 and used for installing a limiting pin plate 52, so that the insertion depth of the railing post 48 is limited.
The construction method for integrally hoisting the large-span overbridge at one side of the lower-span multiple railway business lines mainly comprises the following steps:
s1: construction preparation: the method comprises the steps of field hardening treatment, raw material entering, measurement and setting-out, construction of a reinforced concrete upright post 3 for supporting the steel truss overpass, and installation and fixing of a positioning device 4.
S2: building an assembly jig frame: according to the size of a construction drawing, the longitudinal beams 20 and the cross beams 21 of the assembled jig frame are made of section steel, the height is 600mm, and leveling is performed by a horizontal instrument.
S3: assembling the single-piece side truss: lofting, pre-arching according to 1/1000, sequentially welding and assembling a lower chord beam 7, a bracket 8, an upper chord beam 6, an oblique web beam 9 and a vertical web beam 10, hoisting and erecting the assembled single trusses qualified by inspection and acceptance by 260t truck cranes, enabling the 260t truck cranes not to be loose, and stabilizing the single trusses by temporary oblique braces to achieve safe rear releasable hooking.
S4: and continuously splicing the single truss on the other side, hoisting and erecting the single truss by using a 260t automobile crane without loosening, and stabilizing the single truss by using a temporary inclined strut to achieve safe rear releasable hook.
S5: and sequentially splicing floor beams 12 and tie beams 13 at the bottom and the top between two trusses by using 1 75t truck crane to form a space stable structure system, and then removing the temporary diagonal braces.
S6: construction of auxiliary structural engineering: after the main engineering acceptance is finished, a floor bearing plate 15, a roof panel 14, a roof gutter 17, a protective guard 18, a curtain wall framework, an upper aluminum single plate, a shutter and a lower steel plate are sequentially laid, and the whole overpass forms a closed system.
S7: hoisting the overbridge: the overline bridge truss is lifted, the steel truss of the overline bridge is slowly rotated to the installation position, the steel truss is gently placed to the position of the embedded bolt 37 at the top of the column by utilizing the preassembly positioning baffle 45, the spatial position of the steel truss is synchronously and accurately adjusted, the truss and the fixing and positioning device 4 are connected in a section welding mode, the lifting lock is synchronously removed, and the site is cleaned.
S8: assembling the steel trusses of the overpass side span 2 at two sides: and (3) under the construction state of an adjacent business line, finishing the installation of the steel structures of the side spans 2 of the remaining two side overbridges by adopting a loose splicing mode.
S9: and (3) residual decoration and installation engineering construction: the construction of the floor bearing plate 15 and the roof plate 14 is performed by concrete pouring, the roof is waterproof, the curtain wall glass is installed, and the ceiling and the stone ground inside the overpass are constructed.
S10: and (4) dismantling the overpass assembled temporary protective guard.
Claims (9)
1. The utility model provides a stride many railway business line unilateral integral hoisting large-span overlines down which characterized in that: comprises an overbridge midspan (1), an overbridge side span (2), reinforced concrete columns (3), a fixed positioning device (4) and a plurality of railway business lines (5); the large-span overline bridge is of a steel truss structure which spans a plurality of railway business lines (5) downwards, and comprises an overline bridge midspan (1) and an overline bridge side span (2), wherein the overline bridge midspan (1) is fixed on a reinforced concrete upright post (3) through a fixed positioning device (4), and the overline bridge side span (2) is positioned and fixed through the fixed positioning device (4);
the overpass midspan (1) comprises an upper chord girder (6), a lower chord girder (7), a bracket (8), an oblique web girder (9), a vertical web girder (10), a lifting lug (11), a floor girder (12), a tie beam (13), a roof panel (14), a floor bearing plate (15), a gutter support (16) and a roof gutter (17); the bracket (8) is respectively welded on the upper chord beam (6) and the lower chord beam (7), and the bracket (8) is welded with the oblique web beam (9) and the vertical web beam (10) to form a single-piece side steel truss structure; the floor beam (12) is a main beam on the top surface of the steel truss overpass, the tie beam (13) is a secondary beam on the top surface of the steel truss overpass and a connecting beam at the bottom, and the floor beam (12) and the tie beam (13) are welded with the two steel truss structures on the side surfaces to form an integral box-type structure of the overpass; the gutter support (16) is welded on the upper chord beam (6) to support the roof gutter (17);
the fixed positioning device (4) comprises embedded bolts (37), a fixed support (22), an upper base plate (39), an upper groove (40), an anti-skid pad (41), a rubber base plate (42), a lower groove (43), a lower base plate (44), a groove lug plate (54) and a high-strength bolt (25); the fixed positioning device (4) and the positioning baffle (45) are fixed on the reinforced concrete upright post (3) through an embedded bolt (37); the overpass midspan (1) and the lower chord beam (7) of the overpass side span (2) are welded with an overpass positioning lug plate (38) with reserved holes, and the embedded bolts (37) penetrate through the reserved holes to position and fix the steel truss overpass;
a plurality of gutter supports (16) are welded on two sides of the upper chord beam (6) along the length direction and used as fixed supporting structures of roof gutters (17), and guard railings (18) take the roof gutters (17) as templates and are arranged on the tops of the outer vertical surfaces of the roof gutters (17); the roof gutter (17) is of a groove-shaped structure, the outer layer of the roof gutter (17) is wrapped with a steel plate (19), concrete (46) is filled in the steel plate (19), a plurality of embedded sleeves (47) are arranged in the concrete (46) at equal intervals, and the upper ends of the embedded sleeves (47) are exposed out of the upper surface of the concrete (46); the guard rail (18) is an assembled type temporary protection structure which is easy to disassemble and mainly comprises a guard rail upright post (48), a guard rail body (49), upright post ear plates (50), guard rail ear plates (51), high-strength bolts (25), limiting pin plates (52) and bolt holes (53); the railing upright post (48) of the guard railing (18) is inserted into the embedded sleeve (47).
2. The single-sided integral hoisting long-span overbridge spanning multiple railway business lines according to claim 1, which is characterized in that: the upper chord beam (6), the lower chord beam (7), the oblique web beam (9), the vertical web beam (10) and the floor beam (12) are welded box-shaped section beams; the tie beam (13) is a welded H-shaped steel beam; a roof panel (14) is arranged between the upper chord beams (6), a floor bearing plate (15) is arranged between the lower chord beams (7), and the roof panel (14) and the floor bearing plate (15) are of a profiled steel sheet and concrete combined structure.
3. The single-sided integral hoisting long-span overbridge spanning multiple railway business lines according to claim 1, which is characterized in that: the long-span steel truss overpass is formed by integrally assembling an assembling jig frame consisting of longitudinal beams (20) and transverse beams (21), wherein the longitudinal beams (20) and the transverse beams (21) are both H-shaped steel, and the longitudinal beams (20) and the transverse beams (21) are fixedly connected through L-shaped gaskets (24) and high-strength bolts (25); the assembled jig frame is connected with the fixed support (22) through an expansion bolt (25).
4. The single-sided integral hoisting long-span overbridge spanning multiple railway business lines according to claim 1, which is characterized in that: the single-piece side steel truss structure is fixed through a temporary inclined strut; the temporary diagonal bracing comprises a first hoop (28), a second hoop (29), hoop ear plates (30), a threaded sleeve (26) and a threaded rod (27), wherein the first hoop (28) and the second hoop (29) are groove-shaped structures, the first hoop (28) and the second hoop (29) are fixed into rectangular hoops wrapping the upper chord beam (6) through high-strength bolts (25), and the size of the hoops is matched with that of the upper chord beam (6); the first hoop (28) and the second hoop (29) are provided with hoop ear plates (30), threaded holes (31) are reserved in the hoop ear plates (30), and the first hoop (28) and the second hoop (29) are connected with the threaded sleeve (26) through high-strength bolts (25); the threaded sleeve (26) and the threaded rod (27) form a temporary inclined strut; the temporary inclined strut is fixed on the fixed support (22) through an expansion bolt (23).
5. The single-sided integral hoisting long-span overbridge spanning multiple railway business lines according to claim 1, which is characterized in that: lifting lugs (11) are arranged at the tops of the upper chord beams (6), stiffening plates (33) are welded at the positions of the lifting lugs (11) for reinforcement, and inner partition plates (34) are welded between upper chord beam upper flanges (35) and upper chord beam lower flanges (36) at the positions corresponding to the lifting lugs (11).
6. The single-sided integral hoisting long-span overbridge spanning multiple railway business lines according to claim 1, which is characterized in that: the upper groove (40) and the lower groove (43) are both welded with groove lug plates (54), holes are reserved in the lower cushion plate (44) and the groove lug plates (54), and the high-strength bolt (25) welded on the fixed support (22) penetrates through the reserved holes in the lower cushion plate (44) and the groove lug plates (54) to fix the lower cushion plate (44) and the lower groove (43); a high-strength bolt (25) welded to the upper backing plate (39) passes through the groove lug plate (54) to fix the upper groove (40).
7. The single-sided integral hoisting long-span overbridge spanning multiple railway business lines according to claim 1, which is characterized in that: the rubber pad (42) is placed in a space formed by the upper groove (40) and the lower groove (43), and the top surface and the bottom surface of the rubber pad (42) are both provided with the anti-skid pad (41).
8. The single-sided integral hoisting long-span overbridge spanning multiple railway business lines according to claim 1, which is characterized in that: a column ear plate (50) with a bolt hole (53) reserved in the column (48) is welded, the column ear plate (50) corresponds to a guardrail ear plate (51) arranged on a guardrail body (49), and the column ear plate (50) positioned at the lower part is higher than the upper surface of the concrete (46); the upright post ear plate (50) and the guardrail ear plate (51) are fixedly connected through a high-strength bolt (25) to form a main body structure of the guardrail (18); the railing post (48) is inserted into the embedded sleeve (47) for a certain length, and a preformed hole for installing a limiting pin plate (52) is formed in the railing post (48).
9. The construction method for integrally hoisting the large-span overbridge on one side of the multiple railway business lines in the downward crossing manner according to claim 1, is characterized by comprising the following steps of:
s1: construction preparation: hardening the field, entering raw materials, measuring and setting out, constructing a reinforced concrete upright post (3) for supporting the steel truss overpass, and installing a fixed positioning device (4);
s2: building an assembly jig frame: according to the size of a construction drawing, longitudinal beams (20) and cross beams (21) of an assembled jig frame are made of profile steel, and leveling is performed by a horizontal instrument;
s3: assembling the single-piece side truss: lofting, pre-arching according to 1/1000, sequentially welding and assembling a lower chord beam (7), a bracket (8), an upper chord beam (6), an oblique web beam (9) and a vertical web beam (10), hoisting and erecting single trusses which are assembled and qualified through inspection and acceptance by using a truck crane, wherein the truck crane is not loose and is used for stabilizing the single trusses by using temporary oblique braces to achieve safe and loose hooks;
s4: continuously splicing the single truss on the other side, hoisting the single truss by using a truck crane without loosening, and stabilizing the single truss by using a temporary inclined strut to achieve safety and then loosening a hook;
s5: sequentially splicing floor beams (12) and tie beams (13) at the bottom and the top between two trusses by using a truck crane to form a space stable structure system, and then removing temporary diagonal braces;
s6: construction of auxiliary structural engineering: after the main engineering acceptance is finished, a floor bearing plate (15), a roof panel (14), a roof gutter (17), a protective guard (18), a curtain wall framework, an upper aluminum single plate, a shutter and a lower steel plate are sequentially laid, and the whole overpass forms a closed system;
s7: hoisting the overbridge: hoisting an overpass steel truss, rotating the overpass steel truss to an installation position, gently positioning the steel truss to the position of an embedded bolt (37) at the top of a reinforced concrete upright post (3) by using a positioning baffle (45), synchronously and accurately adjusting the spatial position of the steel truss, connecting the steel truss with a fixed positioning device (4) by section welding, synchronously removing a hoisting lock and cleaning the site;
s8: assembling the steel trusses of the overpass side span (2) at two sides: under the construction state of an adjacent business line, the installation of the steel structures of the overbridge side spans (2) on the two remaining sides is finished in a loose splicing mode;
s9: and (3) residual decoration and installation engineering construction: constructing a floor bearing plate (15) and a roof plate (14) by concrete pouring, waterproofing a roof, installing curtain wall glass, and constructing a ceiling and a stone ground inside an overpass;
s10: and (4) dismantling the overpass assembled temporary protective guard.
Priority Applications (2)
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| CN202010061861.6A CN111254796B (en) | 2020-01-20 | 2020-01-20 | Single-side integral hoisting long-span overbridge for multiple railway business lines and construction method |
| PCT/CN2020/100539 WO2021147256A1 (en) | 2020-01-20 | 2020-07-07 | Single-side integral hoisted large-span overbridge crossing over multiple railway lines, and construction method therefor |
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| CN202010061861.6A CN111254796B (en) | 2020-01-20 | 2020-01-20 | Single-side integral hoisting long-span overbridge for multiple railway business lines and construction method |
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Also Published As
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| CN111254796B (en) | 2021-11-09 |
| WO2021147256A1 (en) | 2021-07-29 |
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