Tantan-arch-shaped foot bridge structure for connecting mountains on two sides of intersection

Abstract

The invention discloses a flat arch-shaped foot bridge structure for connecting mountains on two sides of an intersection, and relates to the technical field of beam bridge construction. The flat-arch-shaped foot bridge structure for connecting the hills on the two sides of the intersection comprises concrete bridge abutments arranged at the two ends, and strip-shaped foundations are arranged at the bottoms of the concrete bridge abutments; the two ends of the steel beam are poured into the concrete bridge abutments at the two ends; the laminated slab bridge surface is connected to the top of the steel beam through studs; the steel beam body is composed of steel longitudinal beams and steel transverse beams. The broken-line-shaped combined beam bridge is particularly suitable for crossing the engineering environment with mountain bodies or slopes on the two sides, the modeling is attractive, and the stress performance advantages of the foundations on the two sides can be fully utilized; the bridge deck slab adopts a laminated slab form, so that template-free construction can be realized, the laying of the prefabricated slab is quick and convenient, the construction period is shortened to the greatest extent, and the influence of construction on lower traffic is avoided; particularly, the flat bridge floor is beneficial to tight attachment between the prefabricated slabs and the steel beams.

Description

Technical Field

[0001] The present invention relates to the technical field of beam bridge construction, and particularly to a flat arch-shaped pedestrian bridge structure connecting hills on both sides of an intersection. Background Art

[0002] Flat arch-shaped pedestrian bridges, especially those designed to connect hills on both sides of an intersection, are also quite popular globally. They not only provide convenient passageways for pedestrians but also often become highlights in the natural landscape. When constructing such flat arch-shaped pedestrian bridges, the current common practice involves complex connection structures to ensure the overall stability and safety of the bridge structure. Specifically, the construction method at the lateral connection part of such pedestrian bridges may involve leaving connecting steel bars on the sides of precast components (such as arch ribs or bridge deck slabs).

[0003] During the construction process, first, each precast component needs to be accurately positioned. Then, these reserved connecting steel bars are aligned, and formwork is installed. Next, construction workers will weld these connecting steel bars with additional lateral steel bars on-site to form strong lap welds, thereby strengthening the lateral connection of the bridge. After that, concrete is poured to fill the gaps between the precast components, thus forming a continuous and stable bridge structure.

[0004] However, this traditional construction method also faces challenges. Due to the structural characteristics of the flat arch-shaped pedestrian bridge, especially when it spans complex terrains such as hills, the connection structure between precast components becomes particularly complex, resulting in a significant increase in on-site welding work and more difficult control of welding quality. In addition, this construction method often requires a large amount of reinforced concrete materials, which not only increases the construction period but also makes the bridge self-weight larger, which correspondingly increases the requirements for the bearing capacity of the foundation and also increases the material cost and the difficulty of transportation and installation.

[0005] More importantly, the mechanical properties of traditional bridge designs are not ideal under specific working conditions (such as when spanning steep hills or slopes), and they cannot make full use of the support conditions on both sides of the terrain to optimize the stress state of the bridge. Therefore, for flat arch-shaped pedestrian bridges connecting hills on both sides of an intersection, it is particularly important to explore a more efficient, economical, and reasonably stressed construction method. Summary of the Invention

[0006] Aiming at the deficiencies of the prior art, the present invention provides a flat arch-shaped pedestrian bridge structure connecting hills on both sides of an intersection, which solves the problems existing in the existing flat arch-shaped pedestrian bridges.

[0007] To achieve the above objectives, the present invention is realized through the following technical solutions: A flat arch-shaped pedestrian bridge structure connecting hills on both sides of an intersection, comprising:

[0008] Concrete abutments are provided at both ends, and strip foundations are provided at the bottoms of the concrete abutments;

[0009] Steel girders, with both ends cast into the concrete abutments at both ends;

[0010] Composite slab deck, connected to the top of the steel girder by stud bolts;

[0011] The main body of the steel girder is composed of steel longitudinal girders and steel cross girders. The two ends of the steel longitudinal girders are connected to the concrete abutments through connecting embedded sections inserted into the embedded sections of the concrete abutments. A number of groups of steel cross girders are arranged equidistantly side by side along the span direction on the top of the steel longitudinal girders. Notches adapted to the steel cross girders are opened on the top of the steel longitudinal girders for positioning and installing the steel cross girders. An auxiliary support structure is arranged between the steel longitudinal girders and the steel cross girders. The auxiliary support structure is used to disperse the force of the steel cross girders and transfer it to the steel longitudinal girders. Corbels extend out from the bottoms on both sides of the steel longitudinal girders.

[0012] The steel longitudinal girder is composed of an open box girder with an open top, and transverse plates are provided on both sides of the top of the open box girder. The notches are opened in the transverse plates.

[0013] Preferably, the steel cross girder is composed of square steel and extension plates extending outwards at the tops of both ends, and the extension plates are lapped and installed in the notches.

[0014] Preferably, the auxiliary support structure includes an upper support plate and a side support plate. The side support plate is of a quasi-right trapezoidal structure. A first card slot is opened on one side of the side support plate. Second card slots adapted to the first card slot are opened at the bottoms of both ends of the square steel. Support bars are welded on the inner side of the steel longitudinal girder and at the bottom of the side support plate.

[0015] Preferably, the upper support plate is of an inverted triangular structure, and a third card slot is opened at the bottom of the upper support plate. A fourth card slot adapted to the third card slot is opened at the top of the notch.

[0016] Preferably, both the upper support plate and the side support plate are welded to connect the steel longitudinal girder and the steel cross girder.

[0017] Preferably, the middle section of the steel longitudinal girder is a horizontal section, and both ends are inclined sections. The included angle between the inclined section and the horizontal section is 30° - 45°. The cross-section of the embedded section is the same as that of the inclined section. The two sides of the embedded section extend and insert into the two sides of the horizontal section. The embedded section and the inclined section are connected by high-strength bolts or on-site welding. Stud bolts are provided at the bottoms of the inner sides of the embedded section and the inclined section. Concrete filling layers are poured at the inner bottoms of the inclined section and the part of the embedded section located outside the concrete abutment.

[0018] Preferably, the stud bolts on the inclined section are ordinary stud bolts, and the stud bolts on the top of the steel longitudinal girder are anti-pull-out but not anti-shear stud bolts.

[0019] Preferably, an end bearing plate is welded to the end face of the inclined section, and an anchor rod is provided on the side of the end bearing plate away from the inclined section. Anti-slip textures are provided on the surface of the anchor rod, and a reinforcing rib plate is welded between the bottom of the inclined section and the end bearing plate.

[0020] The present invention provides a flat-arch-shaped pedestrian bridge structure connecting hills on both sides of an intersection. Compared with the prior art, it has the following beneficial effects:

[0021] 1. For the flat-arch-shaped pedestrian bridge structure connecting hills on both sides of an intersection, the folded-line-shaped composite beam bridge is particularly suitable for engineering environments where both sides are mountains or slopes. It not only has a beautiful shape but also can make full use of the stress performance advantages of the foundations on both sides; the bridge deck adopts a composite slab form, which can achieve formwork-free construction. The laying of precast slabs is fast and convenient, greatly shortening the construction period and avoiding the impact of construction on the lower traffic; in particular, the flat bridge deck is beneficial for the close fitting between the precast slab and the steel beam.

[0022] 2. For the flat-arch-shaped pedestrian bridge structure connecting hills on both sides of an intersection, the steel longitudinal beam and the steel cross beam are assembled by means of splicing and clamping, and are assisted by a support plate and a side support plate for support, so that the assembly of the steel longitudinal beam and the steel cross beam is convenient for positioning, thereby ensuring the uniform distribution of the steel cross beam, saving the time of on-site measurement and welding, and at the same time dispersing the stress of the steel cross beam and transmitting it to the steel longitudinal beam, ensuring the overall strength.

[0023] 3. For the flat-arch-shaped pedestrian bridge structure connecting hills on both sides of an intersection, the folded-line-shaped composite beam bridge cleverly utilizes the stress performance advantages of both the steel-concrete composite beam and the concrete-filled steel tube structures. It gives full play to the advantages of the composite beam in the horizontal section at the mid-span to resist positive bending moment, and no concrete is poured inside the steel box girder, minimizing the self-weight of the structure to the greatest extent. It gives full play to the advantages of the concrete-filled steel tube components in the inclined sections at both ends to resist axial force and part of the bending moment. By pouring concrete into the steel box girder, the stiffness and bearing capacity of the section are maximally improved, and the steel consumption of the structure can also be effectively reduced; and the force transmission route of the folded-line-shaped composite beam bridge is reasonable and clear, with the bending moment concentrated in the horizontal section at the mid-span, greatly reducing the bending moment at both ends of the support and the arch foot thrust, thereby reducing the cost of the foundation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a perspective view of the overall structure of the present invention;

[0025] Figure 2 is a structural schematic diagram of the steel beam, the composite slab bridge deck and the end bearing plate of the present invention;

[0026] Figure 3 is a structural schematic diagram of the steel beam of the present invention;

[0027] Figure 4 is an exploded view of the partial structure of the steel beam of the present invention;

[0028] Figure 5 This is a cross-sectional view of the steel beam and the composite slab deck of the present invention;

[0029] Figure 6 This is an exploded view of the upper support plate and the steel longitudinal beam of the present invention;

[0030] Figure 7 This is an exploded view of the steel cross beam and the side support plate of the present invention;

[0031] Figure 8 This is a structural schematic diagram of the embedded section and the end bearing plate of the present invention.

[0032] In the figure: 1-concrete abutment, 2-strip foundation, 3-steel beam, 31-steel longitudinal beam, 311-cross panel, 313-fourth card slot, 312-supporting strip, 32-steel cross beam, 321-square steel, 322-extension plate, 323-second card slot, 33-embedded section, 34-notch, 35-concrete filling layer, 301-horizontal section, 302-inclined section, 4-composite slab deck, 5-stud, 6-upper support plate, 61-third card slot, 7-side support plate, 71-first card slot, 8-end bearing plate, 9-anchor rod, 10-strengthening rib plate. Detailed implementation manners

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0034] Refer to Figures 1 - 8 , the present invention discloses an arch-shaped pedestrian bridge structure connecting the hills on both sides of the intersection, and provides three technical solutions:

[0035] The first implementation manner: includes:

[0036] Concrete abutments 1 are provided at both ends, and strip foundations 2 are provided at the bottoms of the concrete abutments 1;

[0037] Steel beams 3 are poured into the concrete abutments 1 at both ends;

[0038] Composite slab decks 4 are connected to the tops of the steel beams 3 through studs 5;

[0039] The main body of the steel beam 3 is composed of a steel longitudinal beam 31 and a steel cross beam 32. Both ends of the steel longitudinal beam 31 are connected to the embedded section 33 of the concrete abutment 1 through the connecting embedded section 33. A number of groups of steel cross beams 32 are arranged equidistantly along the span direction on the top of the steel longitudinal beam 31. The spacing of the steel cross beams 32 is generally more than 10m. For bridges with a narrow deck width, generally only three or four longitudinal beams are used. A notch 34 adapted to the steel cross beam 32 is opened on the top of the steel longitudinal beam 31 for positioning and installing the steel cross beam 32. An auxiliary support structure is arranged between the steel longitudinal beam 31 and the steel cross beam 32, and the auxiliary support structure is used to disperse and transfer the force of the steel cross beam 32 to the steel longitudinal beam 31.

[0040] The folded composite beam bridge is particularly suitable for engineering environments where there are mountains or slopes on both sides. It not only has a beautiful shape but also can make full use of the stress performance advantages of the foundations on both sides. The bridge deck adopts the form of a composite slab, which can realize formwork-free construction. The laying of precast slabs is fast and convenient, greatly shortening the construction period and avoiding the impact of construction on the lower traffic. Particularly, the flat bridge deck is conducive to the close fit between the precast slab and the steel beam.

[0041] The second implementation mode is mainly different from the first implementation mode in that: the steel longitudinal beam 31 is composed of an open box girder with an open top, and transverse panels 311 are arranged on both sides of the top of the open box girder. The notch 34 is opened in the transverse panel 311, and corbels extend out from the bottom of both sides of the steel longitudinal beam 31.

[0042] The steel cross beam 32 consists of a square steel 321 and extension plates 322 extending out from the top of both ends thereof, and the extension plates 322 are lapped and installed in the notch 34.

[0043] The auxiliary support structure includes an upper support plate 6 and a side support plate 7. The side support plate 7 is a right trapezoid-like structure. A first card slot 71 is opened on one side of the side support plate 7. Second card slots 323 engaged with the first card slot 71 are opened at the bottom of both ends of the square steel 321. A support bar 312 is welded inside the steel longitudinal beam 31 and at the bottom of the side support plate 7. The upper support plate 6 is an inverted triangle structure. A third card slot 61 is opened at the bottom of the upper support plate 6. A fourth card slot 313 engaged with the third card slot 61 is opened at the top of the notch 34. Both the upper support plate 6 and the side support plate 7 are welded to connect the steel longitudinal beam 31 and the steel cross beam 32.

[0044] The steel longitudinal beam 31 and the steel cross beam 32 are assembled by means of splicing and clamping, and the upper support plate 6 and the side support plate 7 are used for auxiliary support, so that the assembly of the steel longitudinal beam 31 and the steel cross beam 32 is convenient for positioning, thereby ensuring the uniform distribution of the steel cross beam 32, saving the time of on-site measurement and welding, and at the same time dispersing the force of the steel cross beam 32 and transferring it to the steel longitudinal beam 31, ensuring the overall strength.

[0045] The third implementation method, the main difference from the second implementation method lies in that: the middle section of the steel longitudinal beam 31 is a horizontal section 301, and both ends are inclined sections 302. The length of the horizontal section 301 accounts for 60%-80% of the span. The included angle between the inclined section 302 and the horizontal section 301 is 30°-45°. The cross-section of the embedded section 33 is the same as that of the inclined section 302. Both sides of the embedded section 33 extend and insert into both sides of the horizontal section 301. And the embedded section 33 and the inclined section 302 are connected by high-strength bolts or on-site welding. Studs 5 are provided at the bottom of both the inner side of the embedded section 33 and the inclined section 302. Among them, the studs 5 on the inclined section 302 are ordinary studs, and the studs 5 on the top of the steel longitudinal beam 31 are pull-out resistant but not shear-resistant studs. Concrete filling layers 35 are poured at the inner bottom of the parts of the inclined section 302 and the embedded section 33 located outside the concrete abutment 1;

[0046] An end bearing plate 8 is welded to the end face of the inclined section 302, and an anchor rod 9 is provided on the side of the end bearing plate 8 away from the inclined section 302. Anti-slip textures are provided on the surface of the anchor rod 9 to increase the anti-pulling force. A reinforcing rib plate 10 is welded between the bottom of the inclined section 302 and the end bearing plate 8.

[0047] The folded combined beam bridge cleverly utilizes the mechanical performance advantages of both the steel-concrete composite beam and the concrete-filled steel tube structures. In the mid-span horizontal section 301, the advantages of the composite beam are fully exerted to resist the positive bending moment. Moreover, no concrete is poured inside the steel box girder, minimizing the self-weight of the structure to the greatest extent. In the inclined sections at both ends, the advantages of the concrete-filled steel tube components are fully exerted to resist the axial force and part of the bending moment. By pouring concrete into the steel box girder, the stiffness and bearing capacity of the cross-section are maximally improved, and the steel consumption of the structure can also be effectively reduced; and the force transmission path of the folded combined beam bridge is reasonable and clear, and the bending moment is concentrated in the mid-span horizontal section 301, greatly reducing the bending moment at both ends of the supports and the thrust at the arch feet, thereby reducing the cost of the foundation.

[0048] In summary, this structural form is particularly suitable for bridge structures with a span of 50-200m, which can maximize the advantages of the composite structure, not only have good landscape effects, but also effectively reduce the project cost and shorten the construction period.

[0049] The force transmission path of this bridge is as follows:

[0050] 1) The concrete composite slab deck 4 and the steel longitudinal and transverse beams form a two-way composite slab force transmission system, transmitting the load on the deck to the steel cross beam 32 and the steel longitudinal beam 31;

[0051] 2) The mid-span horizontal section 201 of the steel longitudinal beam 31 and the concrete composite slab deck 4 form a composite beam force transmission system, transmitting the upper load to the inclined sections 302 at both ends of the steel longitudinal beam 31;

[0052] 3) The inclined sections 302 at both ends of the steel longitudinal beam 31 and the concrete composite slab deck 4 and the internally filled concrete form a combined column force transmission system, transmitting the upper load and the load transmitted by the mid-span horizontal section 301 to the embedded sections 33 at both ends of the steel longitudinal beam 31;

[0053] 4) The steel longitudinal beam 31 of the embedded section 33 transmits all the loads to the concrete abutment 1 through the end bearing plate 8 and the stud 5 on the outer wall, and then transmits them to the lower strip foundation 2 and the surrounding soil;

[0054] The construction method of the flat arch-shaped pedestrian bridge structure on the hills on both sides of the connection intersection includes the following steps:

[0055] Step 1: Construction of the strip foundation 2 and the concrete abutment 1. When constructing the concrete abutment 1, first embed the embedded section 33 of the steel longitudinal beam 31, the end bearing plate 8, the anchor bolt 9, and the stiffening rib plate 10 at its end;

[0056] Step 2: Erect temporary supports and install the inclined sections 302 at both ends of the steel longitudinal beam 31. The bottom of the inclined section 302 is connected to the extended part of the embedded section 33 by high-strength bolts or on-site welding;

[0057] Step 3: Erect temporary supports and install the mid-span horizontal section 301 of the steel longitudinal beam 31. The connection between the horizontal section 301 and the inclined section 302 is connected by high-strength bolts or on-site welding;

[0058] Step 4: Connect the sections of the steel longitudinal beam 31 on the temporary supports by high-strength bolts or on-site welding;

[0059] Step 5: Assemble the steel cross beam 32 with the bracket extended from the web of the steel longitudinal beam 31 in combination with the auxiliary support structure. The specific method is as follows: First, align the third slot 61 of the upper support plate 6 with the fourth slot 313, then clamp the side support plate 7 on the end of the steel cross beam 32 through the first slot 71 and the second slot 323, then place the steel cross beam 32 at the position corresponding to the notch 34 on the steel longitudinal beam 31, and then weld the upper support plate 6, the side support plate 7, the steel cross beam 32 and the steel longitudinal beam 31;

[0060] Step 6: Lay precast concrete slabs between the steel cross beams 32;

[0061] Step 7: Bind the steel bars of the cast-in-place layer on the surface of the precast slab, and then pour the cast-in-place layer concrete to form the composite slab deck 4;

[0062] Step 8: After the concrete reaches the strength, remove the temporary supports;

[0063] Step 9: Install the bridge deck accessory structure.

[0064] Meanwhile, the content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0065] It should be noted that in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0066] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A flat-arch-shaped pedestrian bridge structure connecting the hills on both sides of the intersection, characterized in that, Including: Concrete abutments are provided at both ends, and strip foundations are provided at the bottoms of the concrete abutments; Steel girders are cast into the concrete abutments at both ends; A composite slab deck is connected to the top of the steel girder by stud bolts; The main body of the steel girder is composed of steel longitudinal girders and steel cross girders. The two ends of the steel longitudinal girders are connected to the concrete abutments through connecting embedded sections inserted into the embedded sections of the concrete abutments. A number of groups of steel cross girders are arranged equidistantly side by side along the span direction on the top of the steel longitudinal girders. Notches adapted to the steel cross girders are opened on the top of the steel longitudinal girders for positioning and installing the steel cross girders. An auxiliary support structure is arranged between the steel longitudinal girders and the steel cross girders. The auxiliary support structure is used to disperse and transfer the force of the steel cross girders to the steel longitudinal girders. Corbels extend out from the bottoms of both sides of the steel longitudinal girders.

2. The structure of a flat arch-shaped pedestrian bridge connecting the hills on both sides of the intersection according to claim 1, characterized in that: The steel longitudinal girder is composed of an open box girder with an open top, and transverse plates are provided on both sides of the top of the open box girder. The notches are opened in the transverse plates.

3. The arched pedestrian bridge structure connecting the hills on both sides of the intersection according to claim 2, characterized in that: The steel cross girder consists of square steel and extension plates extending outwards from the tops of both ends thereof, and the extension plates are lapped and installed in the notches.

4. A flat arch-shaped pedestrian bridge structure connecting the hills on both sides of the intersection, characterized in that: The auxiliary support structure includes an upper support plate and a side support plate. The side support plate is of a right trapezoid-like structure. A first card slot is opened on one side of the side support plate. Second card slots adapted to the first card slot are opened at the bottoms of both ends of the square steel. A support strip is welded to the inner side of the steel longitudinal girder and at the bottom of the side support plate.

5. The structure of a flat-arch pedestrian bridge connecting the hills on both sides of the intersection according to claim 4, characterized in that: The upper support plate is of an inverted triangle structure. A third card slot is opened at the bottom of the upper support plate. A fourth card slot adapted to the third card slot is opened at the top of the notch.

6. A flat arch-shaped pedestrian bridge structure connecting hills on both sides of an intersection, characterized in that: Both the upper support plate and the side support plate are welded to connect the steel longitudinal girder and the steel cross girder.

7. A flat arch-shaped pedestrian bridge structure connecting the hills on both sides of the intersection, characterized in that: The middle section of the steel longitudinal girder is a horizontal section, and both ends are inclined sections. The included angle between the inclined section and the horizontal section is 30°-45°. The cross section of the embedded section is consistent with that of the inclined section. Both sides of the embedded section extend and insert into both sides of the horizontal section. The embedded section and the inclined section are connected by high-strength bolts or on-site welding. Stud bolts are provided at the bottoms of the inner sides of the embedded section and the inclined section. Concrete filling layers are poured at the inner bottoms of the inclined section and the part of the embedded section located outside the concrete abutment.

8. A flat-arch-shaped pedestrian bridge structure connecting the hills on both sides of the intersection, characterized in that: The stud bolts on the inclined section are ordinary stud bolts, and the stud bolts on the top of the steel longitudinal girder are anti-pull-out but not anti-shear stud bolts.

9. The structure of a flat-arch pedestrian bridge connecting the hills on both sides of an intersection according to claim 8, characterized in that: An end bearing plate is welded to the end face of the inclined section, and an anchor rod is provided on the side of the end bearing plate away from the inclined section. Anti-slip textures are provided on the surface of the anchor rod. A reinforcing rib plate is welded between the bottom of the inclined section and the end bearing plate.

Images