CN111962374A - Quickly-installed space truss long-span light steel walking bridge and construction method thereof - Google Patents
Quickly-installed space truss long-span light steel walking bridge and construction method thereof Download PDFInfo
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- CN111962374A CN111962374A CN202010709217.5A CN202010709217A CN111962374A CN 111962374 A CN111962374 A CN 111962374A CN 202010709217 A CN202010709217 A CN 202010709217A CN 111962374 A CN111962374 A CN 111962374A
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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
- 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
- E01D2101/00—Material constitution of bridges
- E01D2101/30—Metal
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Abstract
The invention discloses a quickly-installed space truss long-span light steel walking bridge and a construction method thereof, wherein the space truss long-span light steel walking bridge comprises a footpath structure and a handrail structure; the pavement structure comprises a plurality of pavement trusses arranged at intervals; the handrail structure comprises a plurality of handrail trusses, the handrail trusses are arranged on two sides of two adjacent footpath trusses, the handrail trusses comprise XZ plane handrail trusses and YZ plane handrail trusses, and the two XZ plane handrail trusses are arranged in parallel and are respectively perpendicular to the two YZ plane handrail trusses. The handrail truss structure adopts a three-dimensional truss structure, so that the side support of the handrail truss is increased, the cross section sizes of the handrail structure and the footpath structure in the direction perpendicular to the span direction are increased, the vertical rigidity and the lateral rigidity are improved, and the problem of external instability of the handrail structure under the pressure is solved. The invention relates to the technical field of bridge construction.
Description
Technical Field
The invention relates to the technical field of bridge construction, in particular to a quickly-installed space truss long-span light steel walking bridge and a construction method thereof.
Background
Modern city construction is accompanied with indispensable traffic facilities, adopts pedestrian overpass, underpass etc. to realize the intercommunication of road both sides usually to crowd intensive city, is convenient for the pedestrian to go out. Compared with an underground passage built together with road facilities, the pedestrian overpass is more flexible and convenient to set.
The traditional pedestrian overpass such as a concrete bridge and a steel box girder bridge is mature in technology, but is long in construction period and high in unit cost, and is a permanent facility after being built, so that the maintenance and replacement cost is high. In recent years, a novel pedestrian bridge represented by an aluminum alloy bridge appears in China, and the bridge has the following problems: (1) the elastic modulus of the aluminum alloy is only steel 1/3, and the aluminum alloy is expensive, and in order to ensure the structural rigidity, the wall thickness of the aluminum alloy member usually reaches several centimeters, which contradicts the trend that the structure is developed towards a more concise direction. (2) The connection technology of the aluminum alloy structural member is not as pure as that of a steel structure, so that the construction cost is improved, and the connection reliability is not as good as that of the steel structure.
The cold-formed thin-wall section steel is thin-wall steel, the thickness is usually several millimeters, the light steel is called as light steel due to the light weight, and the economic cost of the light steel structure is not higher than that of the traditional hot-rolled steel structure. In addition, most adopt bolted connection in the construction, avoid the quality variability that the welding caused. However, the light steel structure is widely applied to the field of low-rise houses, and the recognition that the rigidity of the component is lower than that of the traditional steel structure prevents the application of the light steel in the field of pedestrian bridges.
For the light steel foot bridge structure with the current flexible index, the following defects exist: (1) the span is limited, and light steel component linear rigidity is weaker than traditional steel structural component, but light steel component has the advantage of arranging flexibility and installation convenience simultaneously, does not have the case of optimizing from structure self for a while. (2) At present, in few light steel foot bridges, the vertical rigidity of the structure is improved by too much support, but the lateral rigidity of the structure cannot be improved, and the problem of insufficient lateral comfort is easily caused. (3) The steel structure is easy to be instable, and the instability problem of the components, particularly the handrail structure which is easy to be subjected to lateral load, is not considered.
Disclosure of Invention
The present invention is directed to overcoming the drawbacks and deficiencies of the prior art and providing a fast-install space truss, large span, light steel footbridge having high lateral stiffness and a stable handrail construction.
The invention also aims to provide a construction method of the space truss large-span light steel walking bridge capable of being quickly installed.
The purpose of the invention can be realized by the following technical scheme: a space truss large-span light steel walking bridge capable of being quickly installed comprises a footpath structure and a handrail structure; the pavement structure comprises a plurality of pavement trusses arranged at intervals; the handrail structure comprises a plurality of handrail trusses, the handrail trusses are arranged on two sides of two adjacent footpath trusses, the handrail trusses comprise XZ plane handrail trusses and YZ plane handrail trusses, and the two XZ plane handrail trusses are arranged in parallel and are respectively perpendicular to the two YZ plane handrail trusses.
Furthermore, the XZ plane handrail truss comprises a handrail upper chord member, a handrail upper diagonal member, a handrail single C-shaped steel cross rod, a handrail vertical web member, a handrail double C-shaped steel cross rod, a handrail lower diagonal member and a handrail lower chord member; the handrail upper chord member, the handrail single C-shaped steel cross rod, the handrail double C-shaped steel cross rod and the handrail lower chord member are arranged in parallel and are respectively vertical to the two handrail vertical web members which are arranged in parallel; the diagonal line of the upper inclined rod of the handrail is arranged between the upper chord of the handrail and the double C-shaped steel cross rod of the handrail; the diagonal line of the lower inclined rod of the handrail is arranged between the double-C-shaped steel cross rod of the handrail and the lower chord of the handrail.
Furthermore, the cross-sectional dimension of the C-shaped steel adopted by the handrail vertical web member is larger than that of the C-shaped steel adopted by the handrail upper chord member, the handrail single C-shaped steel cross rod, the handrail double C-shaped steel cross rod and the handrail lower chord member; the cross-sectional sizes of the C-shaped steels adopted by the upper handrail chord, the single C-shaped steel cross rod, the double C-shaped steel cross rod and the lower handrail chord are larger than those of the C-shaped steels adopted by the upper handrail diagonal and the lower handrail diagonal. And C-shaped steel with different sections is adopted as the rod pieces according to the connection requirement, holes are formed in the web plate position of the C-shaped steel rod piece with a larger size, the rod piece with a smaller size penetrates through the reserved holes, and finally the flanges of the two rod pieces are connected through bolts.
Further, the YZ plane handrail truss comprises an upper chord member, a vertical web member, an upper inclined member, a double C-shaped steel cross rod, a lower inclined member and a lower chord member; the upper chord member, the connecting double-C-shaped steel cross rod and the connecting lower chord member are arranged in parallel and are respectively vertical to the two connecting vertical web members; the two upper inclined rods are arranged between the upper chord member and the connecting double C-shaped steel cross rod in a crossed manner; and the two lower connecting inclined rods are arranged between the connecting double-C-shaped steel cross rod and the lower connecting chord in a crossed manner.
Further, the two upper inclined rods which are arranged in a crossed manner are two rod pieces with different cross sections, and the two lower inclined rods which are arranged in a crossed manner are two rod pieces with different cross sections.
Furthermore, the cross-sectional size of the C-shaped steel adopted by the connecting vertical web members is larger than that of the C-shaped steel adopted by the upper chord members, the double C-shaped steel cross rods and the lower chord members; the cross-sectional sizes of the C-shaped steels adopted for connecting the upper chord member, the double-C-shaped steel cross rod and the lower chord member are larger than the cross-sectional sizes of the C-shaped steels adopted for connecting the upper inclined rod and the lower inclined rod. And C-shaped steel with different sections is adopted as the rod pieces according to the connection requirement, holes are formed in the web plate position of the C-shaped steel rod piece with a larger size, the rod piece with a smaller size penetrates through the reserved holes, and finally the flanges of the two rod pieces are connected through bolts.
Further, the pavement truss includes pavement upper chord member, pavement vertical web members, pavement diagonal members and pavement lower chord member, pavement upper chord member, pavement lower chord member parallel arrangement, many pavement vertical web members interval set up perpendicularly between pavement upper chord member, pavement lower chord member, and the intersection is provided with the pavement diagonal members between per two pavement vertical web members.
Further, the cross-sectional size of the C-shaped steel adopted by the vertical web members of the footpath is larger than that of the C-shaped steel adopted by the upper chord member and the lower chord member of the footpath; the section size of the C-shaped steel adopted by the upper chord member and the lower chord member of the footpath is larger than that of the C-shaped steel adopted by the inclined rod of the footpath. And C-shaped steel with different sections is adopted as the rod pieces according to the connection requirement, holes are formed in the web plate position of the C-shaped steel rod piece with a larger size, the rod piece with a smaller size penetrates through the reserved holes, and finally the flanges of the two rod pieces are connected through bolts.
Further, the rod pieces in the walkway structure and the handrail structure are connected by bolts. And the bolt connection mode is adopted, so that the assembly rate of the structure is improved.
The other purpose of the invention can be realized by the following technical scheme: a construction method of a quickly-installed space truss large-span light steel walking bridge comprises the following steps:
finishing the size and screw hole processing of the C-shaped steel rod piece;
assembling C-shaped steel rods to form a footpath truss, an XZ plane handrail truss and a YZ plane handrail truss;
the two XZ plane handrail trusses are arranged in parallel and are respectively perpendicular to the two YZ plane handrail trusses to form a handrail truss;
a plurality of pavement trusses are arranged at intervals, and the handrail trusses are arranged on two sides of two adjacent pavement trusses.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the handrail truss structure adopts a three-dimensional truss structure, so that the side support of the handrail truss is increased, the cross section sizes of the handrail structure and the footpath structure in the direction perpendicular to the span direction are increased, the vertical rigidity and the lateral rigidity are improved, and the problem of external instability of the handrail structure under the pressure is solved.
2. Compare traditional steel construction and concrete passenger bridge, the structure is slim and graceful, easily follow-up decoration molding. Meanwhile, on-site welding construction is avoided, so that quality uncertainty caused by welding is avoided, and the construction cost of foundation construction is further reduced due to a lighter structure.
3. The adoption of a large number of bolting connection modes improves the assembly rate of the structure, so that factory processing and field assembly of construction models become practical, the construction period is greatly shortened, and green civilized construction is easier to realize.
4. Compared with an aluminum alloy bridge, the elastic modulus of steel is utilized to play the advantages of thin wall and light weight of the rod piece, compared with an aluminum alloy material, the rod piece has obvious price advantage and mechanical property advantage, and is simple in structure and reliable in connection.
5. The whole structure is manufactured into prefabricated components in a factory and then transported to a construction site for assembly, so that the on-site construction difficulty and the on-site construction uncertainty are effectively reduced, the installation difficulty is low, the assembled requirement is met, the construction is safe, and the economical efficiency is good.
Drawings
FIG. 1 is a schematic side view of a light steel walking bridge according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view of a light steel walking bridge according to an embodiment of the present invention;
FIG. 3 is a cross-sectional view of a light steel walking bridge according to an embodiment of the present invention;
FIG. 4 is a top plan view of the midspan of a light steel walking bridge in an embodiment of the present invention;
FIG. 5 is a sectional view of a C-section steel according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of an XZ planar handrail truss configuration in an embodiment of the present invention;
FIG. 7 is a schematic view of a YZ plane handrail truss structure in an embodiment of the invention;
fig. 8 is a schematic view of the structure of the pavement truss in the embodiment of the invention.
Wherein: 1: main span, 2: stairs, 3: walkway construction, 4: armrest structure, 5: YZ plane handrail truss, 6: XZ plane handrail truss, 7: a walkway truss, 8: c-section steel, 11: upper chord of handrail, 12: handrail upper diagonal rod, 13: handrail single C-section bar, 14: handrail vertical web member, 15: handrail double C-shaped steel cross bar, 16: handrail down-link, 17: handrail lower chord, 18: connecting upper chord, 19: connecting vertical web members, 20: connecting the upper inclined rod, 21: connecting upper inclined rod, 22: connect two C shaped steel horizontal poles, 23: connecting the lower inclined rod, 24: connecting a lower inclined rod, 25: connecting lower chord, 26: walkway upper chord, 27: ramp, 28: vertical web member of footpath, 29: ramp diagonal, 30: lower chord of walkway, a: web length of C-section steel, b: flange length of C-section steel, C: the width of the flange of the C-shaped steel.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited thereto.
As shown in figure 1, the space truss large-span light steel walking bridge capable of being quickly installed comprises a main span 1 with the length of 40 meters, stairs 2 on two sides and an approach bridge. The main span 1 adopts a variable cross-section design, and the cross-section height is the largest at the midspan position and the smallest at the side span position.
Fig. 2 is a cross-sectional view at a-a of fig. 1, i.e. a cross-sectional view of main span 1 at a mid-span position. The main span 1 includes a walkway structure 3 and a handrail structure 4, both of which are space truss structures composed of a plurality of planar trusses. The walkway structure 3 is 4 meters wide and 1 meter high and consists of a plurality of walkway trusses 7 arranged at 1 meter intervals. After the construction of the walking bridge is completed, a pavement panel is laid on the pavement structure 3 to form a pavement of the walking bridge, and the pavement structure 3 can transfer the load of the bridge deck to the handrail structures 4 on the two sides.
The handrail structure 4 is of variable cross-section construction and has a height of 3.2 metres at the midspan position, 1 metre above the upper surface of the walkway structure 3 and 1.2 metres below. Fig. 3 is a cross-sectional view at B-B of fig. 1, namely a cross-sectional view of main span 1 at the side span position. The height of the handrail structure 4 at this location is 2.2 meters, wherein 1 meter above the upper surface of the walkway structure 3, 0.2 meter below. The handrail structure 4 includes 80 handrail trusses, and 80 handrail trusses are divided into two rows on average and are respectively disposed on both sides of the walkway structure. Every two handrail trusses are arranged on two sides of two adjacent footpath trusses. Each handrail truss comprises a YZ plane handrail truss 5 and an XZ plane handrail truss 6. The two XZ plane handrail trusses are arranged in parallel and are respectively vertical to the two YZ plane handrail trusses. For convenience of description, a three-dimensional coordinate system may be established, with the span direction along the main span 1 being the X-axis, the Z-axis being perpendicular to the X-axis, and the Y-axis being perpendicular to the X-axis and the width direction of the walkway structure 3.
As shown in FIG. 4, the structural composition of the walking bridge is further illustrated by taking the top view of the walking bridge spanning the middle area with the length of 2 meters. The walkway trusses 7 are arranged at intervals of 1 meter and connected to the handrail trusses at both sides. Each handrail truss comprises 2 XZ plane handrail trusses 6 and 2 YZ plane handrail trusses 5, wherein the distance between the 2 XZ plane handrail trusses 6 is 0.5 meter, and the distance between the 2 YZ plane handrail trusses 5 is 1 meter. Since the adjacent handrail trusses are connected to each other, the YZ plane handrail trusses 5 at the connection are common to each other. The handrail trusses arranged on the two sides of the footpath truss can bear the load transferred by the footpath truss.
As shown in FIG. 5, the walking bridge adopts 4 types of cold-bending thin-wall C-shaped steel with different cross-sectional sizes, and the C-shaped steel with different cross-sectional sizes are connected by M12 bolts. The sizes of the 4 types of C-shaped steel are respectively as follows: the length a of a web plate of the first C-shaped steel is 100mm, the length b of a flange is 50mm, and the width C of the first C-shaped steel is 2 mm; the length a of a web plate of the second C-shaped steel is 96mm, the length b of a flange is 48mm, and the width C of the web plate is 2 mm; the length a of a web plate of the third type C-shaped steel is 92mm, the length b of a flange is 46mm, and the width C of the web plate is 2 mm; the length a of the web of the fourth C-shaped steel is 88mm, the length b of the flange is 44mm, and the width C of the flange is 2 mm. The sizes of the 4 types of C-shaped steel are gradually reduced, and the C-shaped steel with smaller size can be nested between flanges of the C-shaped steel with larger size, so that member connection is realized. If the rod pieces are crossed, a hole is formed in a web plate of the large-size C-shaped steel, and flanges on two sides of the large-size C-shaped steel are respectively bolted at the crossed point.
As shown in fig. 6, an XZ plane handrail truss 6 spanning a length of 2 meters in the middle zone is taken for explanation. The XZ plane handrail truss 6 can be divided into the following members from top to bottom: the handrail comprises a handrail upper chord 11, a handrail upper inclined rod 12, a handrail single C-shaped steel cross rod 13, a handrail vertical web member 14, a handrail double C-shaped steel cross rod 15, a handrail lower inclined rod 16 and a handrail lower chord 17. Wherein, the handrail vertical web members 14 adopt first C-shaped steel; the handrail upper chord 11, the handrail single C-shaped steel cross rod 13, the handrail double C-shaped steel cross rod 15 and the handrail lower chord 17 are made of second C-shaped steel; the handrail upper inclined rod 12 and the handrail lower inclined rod 16 adopt a third type of C-shaped steel. The handrail double C-beam cross bar 15 is obtained by bolting 2 symmetrical C-beam members at the web position. Since two adjacent XZ-plane handrail trusses 6 are connected to each other, the handrail web members 14 at the connection are shared with each other.
As shown in fig. 7, taking the YZ plane handrail truss 5 with the maximum height at the midspan position as an illustration, the handrail truss 5 is composed of the following members from top to bottom: the connecting structure comprises an upper chord 18, a vertical web member 19, an upper inclined rod 20, an upper inclined rod 21, a double-C-shaped steel cross rod 22, a lower inclined rod 23, a lower inclined rod 24 and a lower chord 25. Wherein, the connecting vertical web member 19 adopts first C-shaped steel; the upper chord 18, the double C-shaped steel cross rod 22 and the lower chord 25 are made of second C-shaped steel; the upper inclined rod 21 and the lower inclined rod 23 adopt third C-shaped steel; and a fourth type C-shaped steel is adopted for the upper inclined rod 20 and the lower inclined rod 24.
As shown in fig. 8, the walkway truss is 1 m high and 4m wide and consists of the following members: a walkway upper chord 26, a walkway diagonal 27, a walkway vertical web 28, a walkway diagonal 29, a walkway lower chord 30. Wherein the vertical web members 28 of the footpath adopt first C-shaped steel; the upper chord 26 and the lower chord 30 of the footpath are made of second C-shaped steel; the ramp diagonal rod 29 adopts third C-shaped steel; the fourth C-shaped steel is adopted as the footpath diagonal 27.
The invention relates to a construction method of a quickly-installed space truss long-span light steel walking bridge, which comprises the following steps:
(1) rod level: the handrail double C-beam cross-bar 15 and the connecting double C-beam cross-bar 22 are obtained by bolting 2 symmetrical C-beam members at the web position. Firstly, the connection processing of the handrail double-C-shaped steel cross rod 15 and the connecting double-C-shaped steel cross rod 22 and the size and screw hole processing of other rod pieces are completed.
(2) The plane truss layer: the processed C-shaped steel bar is used for assembling an XZ plane handrail truss 6, a YZ plane handrail truss 5 and a footpath truss 7. In the assembling process, when the cross rod and the vertical web member are crossed, a rectangular hole is formed in a web plate of the vertical web member, and the cross rod penetrates through the rectangular hole; when the inclined rods are crossed, a hole is formed in the web plate of the inclined rod with the larger size, and the inclined rod with the smaller size penetrates through the hole. The total length of the walking bridge reaches 40 meters, and the XZ plane handrail truss 6 can be spliced in a construction site in multiple sections.
(3) Space truss level: the handrail truss is a space truss structure and is formed by vertically arranging an XZ plane handrail truss 6 and a YZ plane handrail truss 5. When in connection, the M12 bolt connection is adopted through the bolt reserved on the web plate of the connecting vertical web member 19 and the bolt reserved on the flange of the handrail vertical web member 14. The YZ plane handrail trusses 5 are arranged at intervals of 1 meter in the span direction and are in one-to-one correspondence with the handrail vertical web members 14 arranged in the XZ plane handrail trusses 6 at intervals of 1 meter in sequence.
(4) The overall structure level is as follows: the handrail structure 4 is assembled by the handrail trusses, and the integral walking bridge is assembled by the handrail structure 4 and the footpath structure 3. In the construction, M12 bolts are used for connecting flanges of the handrail vertical web members 14 and webs of the walkway vertical web members 28, and the walkway trusses are arranged at intervals of 1 meter in the span direction and are in one-to-one correspondence with the handrail vertical web members 14 which are sequentially arranged at intervals of 1 meter in the XZ plane handrail truss 6.
In the embodiment, the space truss long-span light steel walking bridge is built by using the cold-formed thin-wall section steel based on the building levels of the rod pieces, the plane truss, the space truss and the integral structure, has good performance, is quick to build, is stable in structure, is high in structural lateral stiffness, has bidirectional stability, and ensures the walking comfort of the structure in the vertical and horizontal directions.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A space truss large-span light steel walking bridge capable of being quickly installed is characterized by comprising a footpath structure and a handrail structure; the pavement structure comprises a plurality of pavement trusses arranged at intervals; the handrail structure comprises a plurality of handrail trusses, the handrail trusses are arranged on two sides of two adjacent footpath trusses, the handrail trusses comprise XZ plane handrail trusses and YZ plane handrail trusses, and the two XZ plane handrail trusses are arranged in parallel and are respectively perpendicular to the two YZ plane handrail trusses.
2. The fast-installation space truss long-span light steel walking bridge of claim 1, wherein the XZ plane handrail truss comprises a handrail upper chord, a handrail upper diagonal, a handrail single C-shaped steel cross rod, a handrail vertical web member, a handrail double C-shaped steel cross rod, a handrail lower diagonal and a handrail lower chord; the handrail upper chord member, the handrail single C-shaped steel cross rod, the handrail double C-shaped steel cross rod and the handrail lower chord member are arranged in parallel and are respectively vertical to the two handrail vertical web members which are arranged in parallel; the diagonal line of the upper inclined rod of the handrail is arranged between the upper chord of the handrail and the double C-shaped steel cross rod of the handrail; the diagonal line of the lower inclined rod of the handrail is arranged between the double-C-shaped steel cross rod of the handrail and the lower chord of the handrail.
3. The space truss long-span light steel walking bridge capable of being quickly installed according to claim 2, wherein the cross-sectional dimension of the C-shaped steel adopted by the handrail vertical web members is larger than the cross-sectional dimensions of the C-shaped steel adopted by the handrail upper chord members, the handrail single C-shaped steel cross rods, the handrail double C-shaped steel cross rods and the handrail lower chord members; the cross-sectional sizes of the C-shaped steels adopted by the upper handrail chord, the single C-shaped steel cross rod, the double C-shaped steel cross rod and the lower handrail chord are larger than those of the C-shaped steels adopted by the upper handrail diagonal and the lower handrail diagonal.
4. The fast-installation space truss long-span light steel walking bridge of claim 1, wherein the YZ plane handrail truss comprises an upper chord, a vertical web, an upper diagonal, a double C-shaped steel cross bar, a lower diagonal and a lower chord; the upper chord member, the connecting double-C-shaped steel cross rod and the connecting lower chord member are arranged in parallel and are respectively vertical to the two connecting vertical web members; the two upper inclined rods are arranged between the upper chord member and the connecting double C-shaped steel cross rod in a crossed manner; and the two lower connecting inclined rods are arranged between the connecting double-C-shaped steel cross rod and the lower connecting chord in a crossed manner.
5. The space truss fast-installing large-span light steel walking bridge according to claim 4, wherein the two upper cross-arranged diagonal rods are two rods with different cross sections, and the two lower cross-arranged diagonal rods are two rods with different cross sections.
6. The space truss long-span light steel walking bridge capable of being quickly installed according to claim 5, wherein the cross-sectional dimension of the C-shaped steel adopted by the connecting vertical web members is larger than the cross-sectional dimensions of the C-shaped steel adopted by the connecting upper chord members, the connecting double C-shaped steel cross rods and the connecting lower chord members; the cross-sectional sizes of the C-shaped steels adopted for connecting the upper chord member, the double-C-shaped steel cross rod and the lower chord member are larger than the cross-sectional sizes of the C-shaped steels adopted for connecting the upper inclined rod and the lower inclined rod.
7. The quickly-installed large-span light-steel walking bridge with the space truss according to claim 1, wherein the pavement truss comprises a pavement upper chord, a pavement vertical web member, a pavement diagonal member and a pavement lower chord member, the pavement upper chord member and the pavement lower chord member are arranged in parallel, a plurality of pavement vertical web members are vertically arranged between the pavement upper chord member and the pavement lower chord member at intervals, and the pavement diagonal member is arranged between every two pavement vertical web members in a crossed manner.
8. The space truss fast-installing, large-span and light-steel walking bridge of claim 7, wherein the cross-sectional dimension of the C-shaped steel adopted by the vertical web members of the footpath is larger than that of the C-shaped steel adopted by the upper chord member and the lower chord member of the footpath; the section size of the C-shaped steel adopted by the upper chord member and the lower chord member of the footpath is larger than that of the C-shaped steel adopted by the inclined rod of the footpath.
9. The space truss fast-installing, large-span and light-steel walking bridge according to any one of claims 1 to 8, wherein the rods in the walkway structure and the handrail structure are connected by bolts.
10. A construction method of a quickly-installed space truss long-span light steel walking bridge is characterized by comprising the following steps:
finishing the size and screw hole processing of the C-shaped steel rod piece;
assembling C-shaped steel rods to form a footpath truss, an XZ plane handrail truss and a YZ plane handrail truss;
the two XZ plane handrail trusses are arranged in parallel and are respectively perpendicular to the two YZ plane handrail trusses to form a handrail truss;
a plurality of pavement trusses are arranged at intervals, and the handrail trusses are arranged on two sides of two adjacent pavement trusses.
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