Low-height widened bridge

Abstract

The utility model relates to the technical field of bridges, in particular to a low-height widening bridge, which adopts a through steel tied arch bridge, a pedestrian lane and a motor vehicle lane on two sides are combined into a whole by adopting a gradual change mode within the range of the arch bridge, a herringbone main arch is arranged between the pedestrian lane and the motor vehicle lane, and the herringbone main arch is arranged between the pedestrian lane and the motor vehicle lane. An arch rib of the herringbone main arch is connected with a straining beam of the motor vehicle lane and a straining beam of the mannequin lane through suspenders, and the straining beam of the motor vehicle lane is connected with the straining beam of the mannequin lane through a cross beam. The large-span low-height widening bridge has the advantages that the problem of design and construction of the large-span low-height widening bridge is solved, widening of the low-height bridge by about 30 m is achieved (specifically, the bridge span, the road widening condition and stress calculation need to be combined), and the large-span low-height widening bridge has good technical economy, obvious social benefits and wide application prospects.

Description

Technical Field

[0001] The utility model relates to the technical field of bridges, in particular to a low-height variable-width bridge. Background Art

[0002] With the improvement of my country's road traffic network, there are more and more bridges in complex and special environments. When the road is controlled by the longitudinal section and the bridge deck width needs to be widened, the low-height bridge types commonly used for large-span bridges are steel arch bridges and steel truss bridges.

[0003] Steel arch bridges are bridges that use arches as their main load-bearing structure. They have a large spanning capacity and are suitable for crossing wide rivers, canyons and other terrains. They are beautiful in appearance and simple in structure, which is conducive to their widespread adoption. They often become landmark buildings in cities, adding to the beauty and cultural heritage of the city. China has many famous large-span steel arch bridges, such as the Shanghai Lupu Bridge and the Chongqing Chaotianmen Bridge.

[0004] The main load-bearing structure of a steel truss bridge is the main truss, which consists of an upper chord, a lower chord and a web member, and bears bending moment and shear force as a beam. This structure optimizes material use and reduces deadweight by hollowing out the solid web steel plate beam while maintaining a high load-bearing capacity. This type of bridge is suitable for a variety of occasions, such as railway bridges, urban bridges or highway viaducts and overpasses.

[0005] When the road width changes significantly, the road is generally divided into sections, with the bridge section maintaining the same width or slightly widening, and the main widening section set in the roadbed transition. However, it is very difficult to realize a bridge with a large width in areas with limited land and buildings in cities. Summary of the invention

[0006] The purpose of the utility model is to provide a low-height widening bridge according to the above-mentioned deficiencies of the prior art. The utility model adopts a bottom-supported steel tie-rod arch bridge. The pedestrian and non-pedestrian lanes and motor vehicle lanes on both sides are gradually merged into a whole bridge in the range of the arch bridge by three bridges. The two main arches are in the shape of a "human". Each main arch is merged into a single-limb large arch rib by two small arch ribs. The main beam of the carriageway adopts a single-box three-chamber steel box beam, which is connected to the motor vehicle lane tie beam on both sides. The motor vehicle lane tie beam is a single-box single-chamber section. The pedestrian and non-pedestrian lane adopts a cantilever beam structure, and the pedestrian and non-pedestrian lane tie beam is a single-box single-chamber section. A crossbeam is provided between the carriageway tie beam and the pedestrian and non-pedestrian lane tie beam, and the crossbeam is a single-box single-chamber section. The arch rib is connected to the main beam by a hanger. The loads of the motor vehicle lane and the pedestrian and non-pedestrian lane are transmitted to the tie beam through the main beam, and the tie beam is transmitted to the hanger, and then to the arch rib, and finally to the lower foundation. The bridge deck achieves the purpose of low height widening by the human-shaped arch rib and the gradual change of the span.

[0007] The purpose of this utility model is achieved by the following technical solutions:

[0008] A low-height variable-width bridge comprises a motor vehicle lane and pedestrian non-walks arranged on both sides thereof, and is characterized in that: a bottom-supported steel tie-rod arch bridge is adopted, the pedestrian non-walks and the motor vehicle lanes on both sides are gradually merged from three bridges into a whole bridge within the range of the arch bridge in a gradual manner, a herringbone main arch is arranged between the pedestrian non-walk and the motor vehicle lane, the arch ribs of the herringbone main arch are connected to the tie beams of the motor vehicle lane and the tie beams of the pedestrian non-walk by hangers, and the tie beams of the motor vehicle lane and the tie beams of the pedestrian non-walk are connected by cross beams.

[0009] The herringbone main arch is composed of two small arch ribs merged into a single large arch rib, wherein the bottom end of one small arch rib is connected to the tie beam of the motor vehicle lane, the bottom end of the other small arch rib is connected to the tie beam of the pedestrian non-pedestrian lane, and the top ends of the two small arch ribs are connected to the main arch rib.

[0010] The main beam of the motor vehicle lane adopts a single-box three-chamber steel box beam, and its two sides are connected to the tie beam of the motor vehicle lane. The tie beam of the motor vehicle lane is a single-box single-chamber section.

[0011] The manhole adopts a cantilever beam structure, and tie beams of the manhole are arranged on both sides thereof, and the tie beams of the manhole are single-box single-chamber cross-sections.

[0012] The crossbeam is a single-box single-chamber cross-section.

[0013] The advantages of the utility model are: solving the difficult problem of designing and constructing large-span, low-height and widened bridges, realizing the widening of low-height bridges by about 30m (the specific width needs to be determined in combination with the bridge span, road widening conditions and force calculation), having good technical and economic performance, obvious social benefits and broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a plan view of the bridge of the utility model;

[0015] Figure 2 This is a bridge elevation layout diagram of the utility model;

[0016] Figure 3 It is a cross-sectional view of the pier on the wide side of the bridge of the utility model;

[0017] Figure 4 This is a cross-sectional view of the main beam and arch rib at the width of the bridge of the utility model;

[0018] Figure 5 This is a cross-sectional view of the main beam and arch rib at the narrow side of the bridge of the utility model;

[0019] Figure 6 This is a cross-sectional view of the main beam and arch rib at the narrow side of the bridge of the utility model (after the tie beam is combined);

[0020] Figure 7It is a cross-sectional view of the narrow side pier of the bridge of the utility model;

[0021] Figure 8 The construction steps of the utility model are as follows: Figure 1 ;

[0022] Fig. 9 The construction steps of the utility model are as follows: Figure 2 ;

[0023] Fig.10 The construction steps of the utility model are as follows: Figure 3 ;

[0024] Fig.11 The construction steps of the utility model are as follows: Figure 4 ;

[0025] Fig.12 The construction steps of the utility model are as follows: Figure 5 . DETAILED DESCRIPTION

[0026] The following is a further detailed description of the features of the present invention and other related features through embodiments in conjunction with the accompanying drawings to facilitate understanding by technicians in the same industry:

[0027] like Figure 1-12 As shown, the marks in the figure respectively represent: motor vehicle lane 1, left sidewalk and non-motor vehicle lane 2, right sidewalk and non-motor vehicle lane 3, left tie beam of motor vehicle lane 4, right tie beam of motor vehicle lane 5, tie beam of left pedestrian and non-motor vehicle lane 6, tie beam of right pedestrian and non-motor vehicle lane 7, left cross beam 8, right cross beam 9, hanger anchor point 10, bridge pier on the wide side 11, bridge pier on the narrow side 12, river revetment 13, motor vehicle lane steel main beam 14-1, left pedestrian and non-motor vehicle lane steel main beam 14-2, right pedestrian and non-motor vehicle lane steel main beam 14-3, left main arch rib 15-1, left small arch rib one 15-2, left small arch rib two 15-3, right main arch rib 15-4, right small arch rib one 15-5, right small arch rib two 15-6, hanger 16, temporary support for main beam construction 17, arch rib support 18.

[0028] Example: Figures 1 to 12As shown, the low-height widening bridge structure in this embodiment adopts a bottom-supported steel tie-rod arch bridge. The pedestrian and non-pedestrian lanes and motor vehicle lanes on both sides are gradually merged from three bridges into a whole within the range of the arch bridge. The two main arches are in the shape of a "human". Each main arch is merged from two small arch ribs to a single large arch rib. The main beam of the carriageway adopts a single-box three-chamber steel box beam, which is connected to the motor vehicle lane tie beam on both sides. The motor vehicle lane tie beam is a single-box single-chamber section. The pedestrian and non-pedestrian lane adopts a cantilever beam structure, and the pedestrian and non-pedestrian lane tie beam is a single-box single-chamber section. A crossbeam is provided between the carriageway tie beam and the pedestrian and non-pedestrian lane tie beam, and the crossbeam is a single-box single-chamber section. The arch rib is connected to the main beam by a hanger. The loads of the motor vehicle lane and the pedestrian and non-pedestrian lane are transmitted to the tie beam through the main beam, and the tie beam is transmitted to the hanger, and then to the arch rib, and finally to the lower foundation. The bridge deck achieves the purpose of widening with a large span and low height by means of human-shaped arch ribs and gradual changes in the span.

[0029] like Figures 1 to 12 As shown, the motor vehicle lane 1 is exclusively for motor vehicles to pass, and the lane width is determined in combination with the traffic flow. In this embodiment, the motor vehicle lane 1 is arranged in the middle of the bridge.

[0030] The left sidewalk and non-motorized vehicle lane 2 is a sidewalk and non-motorized vehicle lane facing the left side of the road in the direction of major mileage, and is for pedestrians and non-motorized vehicles to pass.

[0031] The right sidewalk and non-motorized vehicle lane 3 is a sidewalk and non-motorized vehicle lane facing the right side of the road in the direction of long mileage, for pedestrians and non-motorized vehicles to pass. In this embodiment, the left sidewalk and non-motorized vehicle lane 2 and the right sidewalk and non-motorized vehicle lane 3 are arranged on both sides of the motor vehicle lane 1 respectively.

[0032] The left tie beam 4 of the motor vehicle lane is the main load-bearing structure of the motor vehicle lane 1. It is a single-box single-chamber cross-section steel structure. The motor vehicle lane steel main beam 14-1 and the left cross beam 8 are respectively connected to the left tie beam 4 of the motor vehicle lane. The left tie beam 4 of the motor vehicle lane is connected with the left small arch rib 15-2, the left main arch rib 15-1 and the left cross beam 8 at the end to form an integral structure.

[0033] The right tie beam 5 of the motorway is the main force-bearing structure of the motorway 1. It is symmetrically arranged on the other side of the left tie beam 4 of the motorway and is also a single-box single-chamber cross-section steel structure. The motorway steel main beam 14-1 and the right cross beam 9 are respectively connected to the right tie beam 5 of the motorway. The right tie beam 5 of the motorway is connected to the right small arch rib 15-5, the right main arch rib 15-4 and the right cross beam 9 at the end to form a whole.

[0034] The left pedestrian and non-motorized vehicle lane tie beam 6 is the main load-bearing structure of the left sidewalk and non-motorized vehicle lane 2. It is a single-box single-chamber cross-section steel structure. The left pedestrian and non-motorized vehicle lane steel main beam 14-2 and the left cross beam 8 are respectively connected to the left pedestrian and non-motorized vehicle lane tie beam 6. The left pedestrian and non-motorized vehicle lane tie beam 6 is connected to the left small arch rib 2 15-3, the left main arch rib 15-1 and the left cross beam 8 at the end to form a whole.

[0035] The right pedestrian and non-motorized vehicle lane tie beam 7 is the main force-bearing structure of the right pedestrian and non-motorized vehicle lane 3. It is symmetrical with the left pedestrian and non-motorized vehicle lane tie beam 6 and is also a single-box single-chamber cross-section steel structure. The right pedestrian and non-motorized vehicle lane steel main beam 14-3 and the right cross beam 9 are respectively connected to the right pedestrian and non-motorized vehicle lane tie beam 7, and the right pedestrian and non-motorized vehicle lane tie beam 7 is connected to the right small arch rib 2 15-6, the right main arch rib 15-4 and the right cross beam 9 at the end to form a whole.

[0036] The left crossbeam 8 is a single-box single-chamber cross-section steel structure, which connects the widened left sidewalk and non-motorized vehicle lane 2 and the motor vehicle lane 1 together, and the length of the crossbeam changes gradually with the width of the road.

[0037] The right crossbeam 9 is a single-box single-chamber cross-section steel structure, which connects the widened right sidewalk and non-motorized vehicle lane 3 and the motor vehicle lane 1 together, and the length of the crossbeam changes gradually with the width of the road.

[0038] The hanger anchor point 10 is the connection point between the hanger 16 and the tie beams (the left tie beam 4 of the motor vehicle lane, the right tie beam 5 of the motor vehicle lane, the left side pedestrian and non-pedestrian lane tie beam 6, and the right side pedestrian and non-pedestrian lane tie beam 7) on the bridge deck.

[0039] The bridge pier 11 on the bridge width side is a reinforced concrete pier. The load of the upper structure of the bottom-supported steel tie-arch bridge is transferred to the bridge pier 11 on the bridge width side. A plurality of columns are provided according to the variation of the pier width in combination with the bridge deck width.

[0040] The bridge pier 12 on the narrow side of the bridge is a reinforced concrete pier. The load of the upper structure of the bottom-supported steel tie-arch bridge is transferred to the bridge pier 12 on the narrow side of the bridge. The width of the pier is combined with the change of the bridge deck width to set a plurality of columns.

[0041] The river revetment 13 is the revetment of the river spanned by the low-height widened bridge in this embodiment.

[0042] The motor vehicle lane steel main beam 14 - 1 is a single-box three-chamber steel box beam, which can be adjusted in combination with the width of the motor vehicle lane 1 .

[0043] The left pedestrian and non-motorized vehicle lane steel main beam 14 - 2 is a cantilever beam steel structure, which can be adjusted in combination with the width of the left pedestrian and non-motorized vehicle lane 2.

[0044] The right pedestrian and non-motorized vehicle lane steel main beam 14-3 is a cantilever beam steel structure, which can be adjusted in width in combination with the right pedestrian and non-motorized vehicle lane 3.

[0045] The left main arch rib 15-1 is a single-box single-chamber box-section steel structure. To meet the need of widening the bridge, the main arch rib is arranged in a "human" shape, branching into the left small arch rib 1 15-2 and the left small arch rib 2 15-3. It is the main load-bearing member of the entire bridge, bearing the deadweight of the beam and the loads of vehicles and pedestrians through the hanger 16.

[0046] The left small arch rib 15-2 is a single-box single-chamber box-section steel structure, connected to the left main arch rib 15-1, and is the main load-bearing member of the motor vehicle lane 1, bearing the deadweight of the beam and the vehicle load through the hanger 16.

[0047] The left small arch rib 2 15-3 is a single-box single-chamber box-section steel structure, which is connected to the left main arch rib 15-1 and is the main load-bearing member of the left sidewalk and non-motor vehicle lane 2, and bears the pedestrian and non-motor vehicle loads on the beam through the hanger 16.

[0048] The right main arch rib 15-4 is a single-box single-chamber box-section steel structure. To meet the need for the bridge to become wider, the main arch rib is arranged in a "human" shape, branching into the right small arch rib 1 15-5 and the right small arch rib 2 15-6. It is the main load-bearing member of the entire bridge, bearing the deadweight of the beam and the loads of vehicles and pedestrians through the hanger 16.

[0049] The right small arch rib 15-5 is a single-box single-chamber box-section steel structure, connected to the right main arch rib 15-4, and is the main load-bearing member of the motor vehicle lane, bearing the deadweight of the beam and the vehicle load through the hanger 16.

[0050] The right small arch rib 15-6 is a single-box single-chamber box-section steel structure, which is connected to the right main arch rib 15-4 and is the main load-bearing member of the right sidewalk and non-motor vehicle lane 3, and bears the pedestrian and non-motor vehicle loads of the beam through the hanger 16.

[0051] The arch axis of each arch rib is a quadratic parabola, and the line shape can be adjusted based on force calculations.

[0052] The hangers 16 are made of hot-extruded polyethylene high-strength steel wire and arranged in a plumb-face fan shape in the transverse direction of the bridge. The upper end of each hanger 16 is connected to the arch rib, and the lower end is connected to the tie beam.

[0053] The temporary support 17 for main beam construction is set up in the river crossing. It is a steel structure that supports the main beam and upper construction loads during construction and is removed after the bridge construction is completed.

[0054] The arch rib support 18 is erected on the motor vehicle lane steel main beam 14-1, the left pedestrian and non-pedestrian lane steel main beam 14-2, and the right pedestrian and non-pedestrian lane steel main beam 14-3, and the arch rib assembly is completed on the support.

[0055] During construction of this embodiment, the whole bridge construction steps are as follows:

[0056] 1) Set up temporary scaffolding 17 for main beam construction; complete the construction of lower structures such as pier 11 on the wide side of the bridge and pier 12 on the narrow side of the bridge; carry out factory fabrication and processing of steel structure segments including left tie beam 4 for motor vehicle lane, right tie beam 5 for motor vehicle lane, tie beam 6 for left-span pedestrian and non-motor vehicle lane, tie beam 7 for right-span pedestrian and non-motor vehicle lane, left-span crossbeam 8, right-span crossbeam 9, steel main beam 14-1 for motor vehicle lane, steel main beam 14-2 for left-span pedestrian and non-motor vehicle lane, steel main beam 14-3 for right-span pedestrian and non-motor vehicle lane, left-span main arch rib 15-1, left-span small arch rib one 15-2, left-span small arch rib two 15-3, right-span main arch rib 15-4, right-span small arch rib one 15-5, and right-span small arch rib two 15-6.

[0057] 2) Lift the motorway left tie beam 4, motorway right tie beam 5, left side pedestrian and non-pedestrian lane tie beam 6, right side pedestrian and non-pedestrian lane tie beam 7, left side cross beam 8, right side cross beam 9, motorway steel main beam 14-1, left side pedestrian and non-pedestrian lane steel main beam 14-2, right side pedestrian and non-pedestrian lane steel main beam 14-3 steel structures in sections; erect arch rib support 18.

[0058] 3) Lift the steel structures of the left main arch rib 15-1, the left small arch rib 15-2, the left small arch rib 2 15-3, the right main arch rib 15-4, the right small arch rib 1 15-5 and the right small arch rib 2 15-6 in sections; and hang the hoist rod 16.

[0059] 4) Tension the hanger rod 16 and remove the arch rib support 18; construct the adjacent bridge.

[0060] 5) Remove the temporary support 17 for main beam construction, construct the bridge deck and other ancillary facilities, and complete the construction.

[0061] Although the above embodiments have described the concepts and embodiments of the purpose of the utility model in detail with reference to the accompanying drawings, ordinary technicians in this field can recognize that various improvements and modifications can still be made to the utility model without departing from the scope of the claims, so they are not described one by one here.

Claims

1. A low-height variable-width bridge, comprising a motor vehicle lane and pedestrian non-motor vehicle lanes arranged on both sides thereof, characterized in that: A bottom-supported steel tie-bar arch bridge is adopted, and the pedestrian and motor vehicle lanes on both sides are gradually merged from three bridges into a whole bridge within the range of the arch bridge. A herringbone main arch is arranged between the pedestrian and motor vehicle lanes, and the arch ribs of the herringbone main arch are connected to the tie beams of the motor vehicle lane and the tie beams of the pedestrian and motor vehicle lanes through hangers, and the tie beams of the motor vehicle lane and the tie beams of the pedestrian and motor vehicle lanes are connected through cross beams.

2. A low-height variable-width bridge according to claim 1, characterized in that: The herringbone main arch is composed of two small arch ribs merged into a single large arch rib, wherein the bottom end of one small arch rib is connected to the tie beam of the motor vehicle lane, the bottom end of the other small arch rib is connected to the tie beam of the pedestrian non-pedestrian lane, and the top ends of the two small arch ribs are connected to the main arch rib.

3. The low-height variable-width bridge according to claim 1, characterized in that: The main beam of the motor vehicle lane adopts a single-box three-chamber steel box beam, and its two sides are connected to the tie beam of the motor vehicle lane. The tie beam of the motor vehicle lane is a single-box single-chamber section.

4. The low-height variable-width bridge according to claim 1, characterized in that: The manhole adopts a cantilever beam structure, and tie beams of the manhole are arranged on both sides thereof, and the tie beams of the manhole are single-box single-chamber cross-sections.

5. The low-height variable-width bridge according to claim 1, characterized in that: The crossbeam is a single-box single-chamber cross-section.

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