CN210420840U - Cantilever light steel pedestrian truss bridge connecting system based on stay cable structure - Google Patents
Cantilever light steel pedestrian truss bridge connecting system based on stay cable structure Download PDFInfo
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- CN210420840U CN210420840U CN201920767664.9U CN201920767664U CN210420840U CN 210420840 U CN210420840 U CN 210420840U CN 201920767664 U CN201920767664 U CN 201920767664U CN 210420840 U CN210420840 U CN 210420840U
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Abstract
The utility model discloses a cantilever light steel pedestrian truss bridging connection system based on cable-stay structure, the system includes a plurality of truss foot bridges that pass through high-strength bolt connection of striding, every strides truss foot bridge is including handrail truss, pavement truss and the support of being assembled at the scene by cold-formed thin wall light steel and high-strength bolt, and the both ends of every stride truss foot bridge are the equal vertical parallel and are provided with two pylons, two pylons and adjacent two are strided and are connected between handrail truss's the lower chord and be provided with a plurality of cable-stay cables, form truss-pylon-the compound vertical reinforced connection structure system of cable-stay cables. The vertical deflection and the lateral deflection of the bridge body of the utility model are reduced, the fundamental frequency is improved, the integral stability is effectively improved, the bearing capacity is improved, the frequency of pedestrian is kept away, and the pedestrian comfort is improved; the connection strength of the connection part is improved, the construction is simple, the installation is easy, the appearance is attractive and elegant, and the overall requirement of building industrialization is met.
Description
Technical Field
The utility model belongs to the technical field of the building, a cable-stay structure system based on cantilever light steel pedestrian's truss bridge is related to.
Background
The steel structure bridge is widely applied in the field of pedestrian bridges in China, the development trend of modern pedestrian bridges is towards new structures, new materials and new technologies and becomes a direction for forming urban landscape factors, and the traditional steel structure bridge mainly has the following problems:
1. the steel box girder pedestrian overpass is high in height, and ladder ways on two sides are too long;
2. the price of the aluminum alloy material is high, the elastic modulus is only one third of that of steel, and the wide application of the aluminum alloy material is limited to a certain extent;
3. uncertainty caused by cast-in-place construction, construction time extension and construction waste.
At present, light steel structures at home and abroad are mainly applied to industrial plants and public buildings and are rarely used in the construction of pedestrian bridges, heavy steel is mostly used in the existing steel-structure pedestrian bridges, and the research of light steel in the field of pedestrian bridges has a great blank. However, the light steel bridges of the same type on the market today have the following problems:
1. the site operation is complex;
2. the structural stability of the joint cannot be guaranteed;
3. the influence of load factors such as eccentric stress caused by installation and placement errors is not considered.
Under the background, the cold-formed thin-wall section steel is proposed to be used as a material for constructing the pedestrian bridge, the pedestrian truss bridge which can be pre-assembled in a factory is established, and the requirements of building industrialization are met, but the following defects are found in specific practice:
1. the connection between the spans is weaker, and the deflection of the cantilever end is larger;
2. the overall rigidity is insufficient, the overall stability is poor, and the walking comfort is influenced;
3. lateral stiffness is insufficient, and stability is insufficient when lateral loads are considered.
SUMMERY OF THE UTILITY MODEL
The utility model aims at the not enough of above-mentioned prior art, provide a feasibility higher, can show the vertical bearing capacity of promotion large-span bridge, reduce to stride junction amount of deflection between, make full use of material, the truss structure of class cable-stay bridge that the bending resistance mechanical properties is strong.
The purpose of the utility model is realized through one of following technical scheme at least:
the system comprises a plurality of truss footbridges connected through high-strength bolts, wherein each truss footbridge comprises a handrail truss assembled on site by cold-formed thin-wall light-weight steel and high-strength bolts, a walkway truss and a support, two pylons are vertically and horizontally arranged at two ends of each truss footbridge, and a plurality of stayed cables are connected between the two pylons and lower chords of two adjacent handrail trusses to form a truss-pylon-stayed cable composite vertical reinforced connection structure system.
Furthermore, the webs of the upper and lower chord members and the web members of the handrail truss and the left and right chord members of the walkway truss are provided with reserved holes for cable threading.
Furthermore, a footpath transition truss is connected and arranged between footpath trusses of two adjacent truss footbridge, and the footpath transition truss is a parallelogram provided with diagonal supports and is connected with the adjacent footpath truss through high-strength bolts.
Further, the footpath transition truss includes five C shaped steel member spares, including three web members, two chords, two web members both ends are nested in two parallel arrangement's chord member, through high strength bolted connection, pass through high strength bolted connection between the web of two web members in the footpath transition truss outside and the web of the web member of two adjacent step trusses.
Furthermore, a triangular galvanized plate which is connected with the handrail truss and the footpath transition truss through high-strength bolts is arranged between the handrail trusses of the two adjacent truss footbridge, and the middle of the outer side of the triangular galvanized plate is fixedly connected with the cable tower through the high-strength bolts.
Furthermore, the cable tower has an I-shaped cross section, and a plurality of reserved holes for connecting and fixing the corresponding cable-stayed steel cables connected with the cable tower are formed from top to bottom.
Furthermore, the support is respectively and fixedly connected with the cable tower and the triangular galvanized plate through a bottom connecting piece.
Furthermore, the bottom connecting piece comprises a top edge, a side edge and two lug edges, the side edge is connected with a web plate of the I-shaped cable tower through a bolt, the lug edge on one side is connected with a flange on the bottom edge of the triangular galvanized plate through a bolt, and the top edge is connected with the support through a high-strength bolt.
Furthermore, the support comprises a plurality of independent flange plate supporting feet, one end of each flange plate supporting foot is provided with a first flange plate support connected with the top edge of the bottom connecting piece in a bolted mode, and the other end of each flange plate supporting foot is provided with a second flange plate support in a bolted mode, wherein the second flange plate support is in contact with the ground.
Compared with the prior art, the beneficial effects of the utility model are that:
the supporting system is combined with a truss and cable structure, the vertical deflection and the lateral deflection of the bridge body are reduced, the fundamental frequency is improved, the overall stability is effectively improved, the bearing capacity is improved, the frequency far away from the pedestrian is increased, and the pedestrian comfort is improved;
the truss unit uses Q235 type cold-formed thin-wall section steel, the two ends of the web members are embedded into the grooves of the chord members, the flanges of the chord member are connected by high-strength bolts, the chord members are formed by splicing a plurality of sections of chord members, and the spliced parts are connected by using sleeves, so that the installation is convenient;
the truss structure is manufactured into prefabricated components in a factory and then transported to the site for assembly, so that the site construction difficulty is effectively reduced and the uncertainty of site construction is avoided;
the device can be quickly installed completely by depending on a small amount of manpower under the condition of no large-scale mechanical equipment, the installation difficulty is reduced, the requirements of building industrialization are met, the use of on-site construction and assembly parts is reduced, the maintenance is more convenient, the safety is higher, and the construction is simple;
the truss is used as a stress main body, the stress of each rod piece is mainly one-way pulling and pressing, and the reasonable arrangement of the upper chord member, the lower chord member and the web members can adapt to the distribution of bending moment and shearing force in the structure. Because the pulling and pressing internal forces in the horizontal direction realize self balance, the whole structure does not generate horizontal thrust to the support. The structure arrangement is flexible;
the suspension cable structure resists external load (action) through axial stretching of the cable, can make the most of use of the bearing capacity of high-strength steel, and has good economical efficiency;
a truss-cable structure is used between every two spans, the arrangement of the trusses is the same, the structure is simple, and the whole body is attractive and elegant;
the construction of the suspension cable structure is convenient, the self weight of the structure is small, large-scale hoisting equipment, templates, scaffolds and the like are not needed during installation, the suspension cable structure can be installed on a single-span truss bridge main body on site, and the construction cost is relatively low;
and a cable tower is added at the bridge side span connecting position to form a similar cable-stayed structure, so that the deflection of the side span position is reduced, and the static performance of the bridge is improved.
Drawings
Figure 1 is the three-dimensional schematic diagram of southwest isometric side of the embodiment of the utility model
Fig. 2 is a front view of a handrail truss according to an embodiment of the present invention;
fig. 3 is a visual diagram of the connecting sleeve of the handrail truss and the truss chord of the footpath according to the embodiment of the present invention;
fig. 4 is a visual diagram of the two-span bridge handrail truss upper chord connecting sleeve according to the embodiment of the invention;
fig. 5 is a front view of a two-span bridge handrail truss connection according to an embodiment of the present invention;
FIG. 6 is a schematic view of a triangular galvanized sheet according to an embodiment of the present invention;
fig. 7 is a top view of a footpath transition truss according to an embodiment of the present invention;
fig. 8 is a top view of the truss connection of the two-span bridge footpath according to the embodiment of the present invention;
fig. 9 is a schematic view of the position of the hole reserved in the upper chord of the handrail truss according to the embodiment of the present invention;
fig. 10 is a schematic view of the positions of the holes reserved in the lower chord of the handrail truss according to the embodiment of the present invention;
fig. 11 is a schematic view of the position of the reserved holes of the web members of the handrail truss according to the embodiment of the present invention;
fig. 12 is a front view of a walkway truss according to an embodiment of the present invention;
fig. 13 is a side view of a truss bridge according to an embodiment of the present invention;
fig. 14 is a front view of a truss bridge according to an embodiment of the present invention;
fig. 15 is a schematic view of a bottom connector according to an embodiment of the present invention;
fig. 16 is a schematic view of a flange plate support according to an embodiment of the present invention.
In the figure: 1-handrail truss; 2-a walkway truss; 3-stayed steel cables; 4-a cable tower; 5-upper chord of handrail truss; 6-lower chord of handrail truss; 7-a first sleeve; 8-a second sleeve; 9-triangular galvanized sheet; 10-a footpath transition truss; 11-web member; 12-a chord; 13-a first preformed hole; 14-a second reserved hole; 15-handrail truss web members; 16-a rope-passing hole; 17-truss web members of the walkway; 18-the left and right chords of the walkway truss; 19-third reserved holes; 20-a fourth reserved hole; 21-a bottom connector; 22-top edge; 23-lateral; 24-ear edge; 25-independent flange plate supporting feet; 26-a first flange support; 27-second flange support.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, the system comprises a plurality of truss footbridges connected by high-strength bolts, wherein each truss footbridge comprises an armrest truss 1 assembled on site by cold-formed thin-wall light-weight steel and high-strength bolts, a walkway truss 2 and a support, two pylons 4 are vertically and horizontally arranged at two ends of each truss footbridge, and a plurality of stayed cables 3 are connected between the two pylons 4 and lower chords of two adjacent armrest trusses to form a truss-pylon-stayed cable composite vertical reinforced connection structure system.
As shown in FIG. 2, the upper chord 5 of the handrail truss of each bridge span is formed by sequentially connecting 4Q 235 type cold-formed thin-walled steel sections with the size of 3200mm by using a first sleeve 7, and the total length is 12715 mm. The handrail truss lower chord member 6 is formed by connecting Q235 type cold-formed thin-walled steel sections with the sizes of 3200mm, 4885mm and 3200mm in sequence by using a first sleeve 7. As shown in fig. 3, the first sleeve 7 is a member for connecting the chord members, the web size of the first sleeve 7 is 74mm, the web size of each chord member is 80mm, and the first sleeve 7 is nested in two chord members, aligned with the reserved holes, and connected by using high-strength bolts.
As shown in figure 4, the upper chords of the two-span bridge handrail truss are connected by the second sleeve 8, the web size of the second sleeve 8 is 86mm, the web size of the chords is 80mm, and the second sleeve 8 is nested outside the two chords. As shown in fig. 5, a triangular galvanized plate 9 which is used for simultaneously connecting the handrail truss 1 and the footpath transition truss 10 through a high-strength bolt is arranged between the handrail trusses 1 of two adjacent truss footbridges, and the middle part of the outer side of the triangular galvanized plate 9 is fixedly connected with the cable tower 4 through the high-strength bolt. The triangular galvanized plate 9 is aligned with the reserved holes of the second sleeve 8 and the transition truss 10, fixed through high-strength bolts and connected with the two-span bridge handrail truss. As shown in fig. 6, the side length of the triangular galvanized plate 9 is 1830mm, and the opening of the flange at the bottom edge is used for connecting the connecting piece at the bottom of the flange with the first flange plate support.
As shown in fig. 7, a walkway transition truss 10 is connected and arranged between the walkway trusses 2 of the two adjacent truss footbridge, the walkway transition truss 10 is a parallelogram supported diagonally, the walkway transition truss 10 comprises five C-shaped steel members, including three web members and two chord members 12, two ends of the two web members 11 are nested in the two chord members 12 arranged in parallel and connected through high-strength bolts. As shown in fig. 8, the walkway transition truss 10 is placed between two bridges, and two web members outside the walkway transition truss 10 are connected with the web plates of the web members of the two adjacent walkway trusses 2 by high-strength bolts.
As shown in fig. 9 and 10, the web plates of the upper chord member and the lower chord member of the handrail truss are respectively provided with a plurality of first preformed holes 13 and second preformed holes 14 for threading, and the diameter of each first preformed hole 13 and each second preformed hole 14 is 20 mm. The distances from the first reserved hole 13 of the upper chord 5 of the handrail truss to one end are 471.5mm, 1061.6mm, 1744.3mm, 2507.3mm, 10259.1mm, 11024.6mm, 11709.8mm and 12302.8mm in sequence by taking one end of the chord as a reference, and the distances from the second reserved hole 14 of the lower chord 6 of the handrail truss to the one end are 842.5mm, 2442.5mm, 4042.5mm, 7242.5mm, 8842.5mm and 10442.5mm in sequence.
As shown in fig. 11, for the needs of rope threading, a plurality of rope threading holes 16 with the diameter of 20mm are arranged on the web plate of the handrail truss web member 15, and the positions of the rope threading holes 16 are shown in fig. 11.
As shown in fig. 12, the left and right chords 18 of the truss for the footpath are formed by connecting 7 pieces of Q235 type cold-formed thin-walled steel with the size of 1600mm in sequence by using first sleeves 7, and the total length is 11200 mm. The web members 17 of the pavement truss directly bear pedestrian load in actual use, are connected with the left and right chords 18 of the pavement truss through high-strength bolts, and the connection mode of the pavement truss 2 and the handrail truss 1 is that the web plates of the chords of the pavement truss are connected with the flange at the inner side of the web plate of the handrail truss through high-strength bolts. In consideration of the requirement of cable threading, holes are reserved at the web plates of the left chord 18 and the right chord 18 of the pavement truss, a plurality of third reserved holes 19 are arranged on the upper chord and the lower chord, the distances from the left ends of the chords are 550.6mm, 1958.2mm, 3383.4mm, 4824mm, 6300.8mm, 7741.8mm, 9167.6mm and 10575.7mm in sequence, and the diameters of the third reserved holes 19 are 20 mm.
As shown in fig. 13, a pylon 4 with an i-shaped cross section is arranged on the outer side of the middle of the triangular galvanized plate 9 connected to the two-span bridge handrail truss, the flanges of the pylon are tightly connected with the triangular galvanized plate 9 and the second sleeve 8 through high-strength bolts, the flanges of the pylon are aligned with the reserved holes, the bottoms of the pylon are aligned with the bottoms of the triangular galvanized plate, and the pylon 4 and the lower chords of the two-span handrail trusses 1 are respectively connected through the stayed-cable steel cables 3, so that the side span deflection of the bridge is reduced. A plurality of fourth reserved holes 20 are formed in the upper end of each cable tower 4 in the vertical direction, the diameter of each fourth reserved hole 20 is 20mm, the corresponding cable-stayed steel cables 3 connected with the fourth reserved holes are fixedly connected with the fourth reserved holes, and the diameter of each cable-stayed steel cable 3 is 10 mm. As shown in fig. 14, the connection positions of the stayed-cable 3 are shown, and the triangular galvanized plate 9 and the pylon 4 are provided with corresponding bolt holes.
As shown in fig. 15, the support is fixedly connected with the cable tower and the triangular galvanized plate 9 through bottom connecting pieces 21.
The bottom connecting piece 21 comprises a top edge 22, a side edge 23 and two lug edges 24, the side edge 23 is connected with a web plate of the I-shaped cable tower 4 through a bolt, the lug edge 24 on one side is connected with a bottom edge flange of the triangular galvanized plate 9 through a bolt, and the top edge 22 is connected with the support through a high-strength bolt.
As shown in fig. 16, the support comprises a plurality of individual flange braces 25, the flange braces 25 being bolted at one end to a first flange support 26 connected to the top edge 22 of the bottom connector and at the other end to a second flange support 27 in ground contact for supporting the pylon.
In the construction process, all the members, the stayed-cable steel cables and the glass are produced in a factory, transported to a construction site and assembled into the truss bridge with the truss-cable composite structure. The field assembly process is as follows:
1. as shown in fig. 2 and 12, the single chord member and the web member are assembled into a single truss through a first sleeve 7 and a high-strength bolt, a handrail truss 1 and a walkway truss 2 are connected to form a light steel bridge framework, the two bridge walkway trusses and the handrail truss are respectively connected through a walkway transition truss 10, a second sleeve 8 and a triangular galvanized plate 9, a pylon 4 and the triangular galvanized plate 9 are connected through the high-strength bolt, a bottom connecting member 21 is connected to the lower part of the galvanized triangular plate 9 and the pylon 4, a side edge 23 of the bottom connecting member 21 is connected with a web plate of an i-shaped pylon 4 through a bolt, an ear edge 24 at one side is connected with a bottom flange of the triangular galvanized plate 9 through a bolt, and a first flange plate support 26 is installed at a top edge 22;
2. the diagonal steel cable 3 penetrates from top to bottom, sequentially penetrates through each reserved hole at the top end of the cable tower 4, the first reserved hole 13 of the upper chord 5 of the handrail truss, the cable penetrating hole 16 of the web member and the third reserved hole 19 of the chord of the walkway truss, and is finally connected with the second reserved hole 14 of the lower chord 6 of the handrail truss, and the two ends of the diagonal steel cable 3 in each unit are in a free state and are fixed to the free end by using a steel sleeve;
3. during hoisting construction, firstly binding the temporary hoisting frame on the truss bridge, hoisting the bridge body to a certain height by using machinery, enabling the independent flange plate supporting feet 25 to vertically fall down, manually adjusting the supporting feet to align with the axis of the spiral pile for positioning, then manually moving the supporting feet, moving the supporting feet to an appointed position while the bridge body falls down, connecting the supporting feet with the second flange plate support 27 when the supporting feet reach a proper height, removing the hoisting frame, and completing the hoisting operation of the single-span truss bridge.
In this embodiment, this novel system is strengthened to vertical connection of cable-stay cable wire suitable for light steel construction pedestrian bridge, has improved the vertical overall stability of light steel pedestrian bridge, has reduced the vertical amount of deflection of side span junction simultaneously, has improved the joint strength and the people's travelling comfort of junction, and the construction is simple, easily installation, and elegant appearance accords with the overall requirement of building industrialization.
The above embodiments of the present invention are merely examples for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (9)
1. The utility model provides a light steel pedestrian truss bridge connected system of cantilever based on suspension cable structure which characterized in that: the system comprises a plurality of truss foot bridges connected through high-strength bolts, wherein each truss foot bridge comprises a handrail truss (1) assembled on site by cold-formed thin-wall light steel and high-strength bolts, a pavement truss (2) and a support, two cable towers (4) are vertically and horizontally arranged at two ends of each truss foot bridge, and a plurality of cable-stayed steel cables (3) are connected between the two cable towers (4) and lower chords of two adjacent truss foot bridges to form a truss-cable tower-cable-stayed steel cable composite vertical reinforced connection structure system.
2. The system for connecting the cantilever light steel pedestrian truss bridge based on the stayed-cable structure according to claim 1, wherein: the webs of the upper chord member, the lower chord member and the web member of the handrail truss (1) and the webs of the left chord member and the right chord member of the walkway truss (2) are provided with reserved holes for cable threading.
3. The system for connecting the cantilever light steel pedestrian truss bridge based on the stayed-cable structure according to claim 1, wherein: a footpath transition truss (10) is connected and arranged between footpath trusses (2) of two adjacent truss footbridges, and the footpath transition truss (10) is a parallelogram provided with diagonal supports and is connected with the adjacent footpath truss (2) through high-strength bolts.
4. The system for connecting the cantilever light steel pedestrian truss bridge based on the stayed-cable structure as claimed in claim 3, wherein: the walkway transition truss (10) comprises five C-shaped steel rod pieces, and comprises three web members and two chord members (12), the two ends of the two web members (11) are nested in the two chord members (12) arranged in parallel and connected through high-strength bolts, and the two web members outside the walkway transition truss (10) and webs of the web members of the two adjacent walkway truss (2) are connected through the high-strength bolts.
5. The system for connecting the cantilever light steel pedestrian truss bridge based on the stayed-cable structure as claimed in claim 3, wherein: a triangular galvanized plate (9) which is connected with the handrail truss (1) and the footpath transition truss (10) through high-strength bolts is arranged between the handrail trusses (1) of the two adjacent truss footbridges, and the middle of the outer side of the triangular galvanized plate (9) is fixedly connected with the cable tower (4) through the high-strength bolts.
6. The system for connecting the cantilever light steel pedestrian truss bridge based on the stayed-cable structure according to claim 1, wherein: the cable tower (4) is H-shaped in cross section, and is provided with a plurality of reserved holes used for connecting and fixing corresponding cable-stayed steel cables connected with the cable tower from top to bottom.
7. The system for connecting the cantilever light steel pedestrian truss bridge based on the stayed-cable structure according to claim 1, wherein: the support is respectively and fixedly connected with the cable tower and the triangular galvanized plate (9) through a bottom connecting piece (21).
8. The system of claim 7, which is characterized in that: the bottom connecting piece (21) comprises a top edge (22), a side edge (23) and two lug edges (24), the side edge (23) is connected with a web plate of the I-shaped cable tower (4) through a bolt, the lug edge (24) on one side is connected with a bottom edge flange of the triangular galvanized plate (9) through a bolt, and the top edge (22) is connected with the support through a high-strength bolt.
9. The system for connecting the cantilever light steel pedestrian truss bridge based on the stayed-cable structure as claimed in claim 8, wherein: the support comprises a plurality of independent flange plate supporting feet (25), one end of each flange plate supporting foot (25) is provided with a first flange plate support (26) in a bolted mode, the first flange plate support is connected with the top edge (22) of the bottom connecting piece, and the other end of each flange plate supporting foot is provided with a second flange plate support (27) in a bolted mode, wherein the second flange plate support is in contact with the ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201920767664.9U CN210420840U (en) | 2019-05-27 | 2019-05-27 | Cantilever light steel pedestrian truss bridge connecting system based on stay cable structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920767664.9U CN210420840U (en) | 2019-05-27 | 2019-05-27 | Cantilever light steel pedestrian truss bridge connecting system based on stay cable structure |
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| CN210420840U true CN210420840U (en) | 2020-04-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111962374A (en) * | 2020-07-22 | 2020-11-20 | 华南理工大学 | Quickly-installed space truss long-span light steel walking bridge and construction method thereof |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111962374A (en) * | 2020-07-22 | 2020-11-20 | 华南理工大学 | Quickly-installed space truss long-span light steel walking bridge and construction method thereof |
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Granted publication date: 20200428 Termination date: 20210527 |