Self-forming pedestrian arch bridge structure based on active bending and construction method thereof

Abstract

The application provides a self-forming pedestrian arch bridge structure based on active bending, which comprises at least two lattice members with the same span, width and cross height as arch ribs and bases fixed on the ground at two ends of the lattice members, each of the lattice members comprising a plurality of first slender rods which are actively bent to form the arch ribs. The application also provides a construction method of the self-forming pedestrian arch bridge structure based on active bending. Each of the lattice members as the arch ribs is actively bent by a plurality of first slender rods with the same length, and the plurality of first slender rods are actively bent and inserted into the base in sequence during construction, and then constrained into an integral member by a first lattice member node, so that the problem that a large-size cross section member cannot be directly bent by manpower can be avoided, and the internal stress caused by bending in the member can be significantly reduced, and the structural and construction risks can be reduced.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of civil engineering, and particularly relates to a self-forming pedestrian arch bridge structure based on active bending and a construction method thereof. BACKGROUND

[0002] Active bending refers to a bending process in which a flat rod, plate, membrane or other component is formed into a curved or curved surface geometry under the action of an external force through elastic deformation. Self-forming refers to a process in which the above-mentioned component naturally forms a shape consistent with the shape set by the architect in advance without additional processing or forming steps through active bending. Using the concept of active bending and self-forming, a spatial structure with a complex curved surface shape can be built by a plurality of slender rods. In engineering, self-forming is generally achieved by variable cross-section components, i.e. a lattice member composed of a plurality of slender rods, which facilitates adjustment of the cross-sectional size of the member by increasing or decreasing the number of rods. If the above-mentioned lattice member is directly actively bent, on the one hand, a larger external force is required, i.e. the construction process cannot be completed by manpower; on the other hand, there are significant internal stresses in the member, which has a greater structural and construction risk. SUMMARY

[0003] In view of the defects of the prior art, the purpose of the present application is to provide a self-forming pedestrian arch bridge structure based on active bending and a construction method thereof, which solves the problems of large external force required and high risk in the construction process of the self-forming structure based on active bending.

[0004] To achieve the above-mentioned purpose, the solution adopted by the present application is as follows:

[0005] In a first aspect, the present application provides a self-forming pedestrian arch bridge structure based on active bending, comprising at least two lattice members with the same span, width and cross-section as arch ribs and bases fixed on the ground at both ends of the lattice members, each lattice member comprising a plurality of first slender rods actively bent to form arch ribs, and a plurality of connecting members connecting two adjacent lattice members.

[0006] Preferably, each lattice member further comprises a plurality of second slender rods with a length less than half of the first slender rods, which are actively bent at both ends of each lattice member, and the number of second slender rods at both ends of each lattice member is the same to form arch ribs with thick ends and thin middle.

[0007] Preferably, each lattice member comprises 25-35 first slender rods and 10-20 second slender rods at each end.

[0008] Preferably, the number of the connecting members is 10-16, and every 2 connecting members form a pair, and 5-8 pairs of connecting members are evenly spaced and symmetrically distributed on the entire curved arc of the two latticed members, and each pair of connecting members is arranged on the upper and lower sides of the latticed member.

[0009] Preferably, the first and second elongated rod members are circular rods with a circular cross section with a diameter of 12-20 mm, the length of the first elongated rod member is 8000-14000 mm, the length of the second elongated rod member is 3500-6500 mm, the connecting member is a circular rod with a circular cross section with a length of 1800-2000 mm, and the span of each latticed member formed is 6200-7200 mm, the width is 1200-2200 mm, and the span-to-height ratio is 3200-4200 mm.

[0010] Preferably, on each latticed member, a first latticed member node is arranged at the connecting position of the plurality of connecting members, and the first latticed member node is tied on the latticed member.

[0011] Preferably, a second latticed member node is further arranged between the two adjacent first latticed member nodes, and the second latticed member node is tied on the latticed member.

[0012] Preferably, the first latticed member node is thicker than the second latticed member node.

[0013] Preferably, the first and second elongated rod members and the connecting member are circular rods made of glass fiber reinforced plastic (GFRP) material, and the base is made of steel material; the first and second latticed member nodes are made of steel wire cutting, and the inner core is made of PLA material by 3D printing process.

[0014] In a second aspect, the present application further provides a construction method of the active bending-based self-forming pedestrian arch bridge structure as described above, comprising the following steps:

[0015] Step (1), positioning and fixing the base: according to the size of each member constituting the active bending-based self-forming pedestrian arch bridge structure, the specific positions of at least four bases are determined on the construction site, the expansion bolts are passed through the fixing holes of the bases and are driven into the cement ground, and then the bases are fixed on the ground;

[0016] Step (2), erecting the scaffold: bowl buckle scaffolds are erected on both sides and inside of the humanoid arch bridge, the bowl buckle and the cross bar are connected to ensure that the overall structure is stable and has a high safety factor;

[0017] Step (3), inserting lattice members: actively bending several first slender rods and inserting them into the insertion holes of the base in sequence, and then inserting several second slender rods in sequence;

[0018] Step (4), installing lattice member nodes: installing first lattice member nodes and second lattice member nodes according to the size and spacing of the connecting members constituting the active-bending-based self-forming pedestrian arch bridge structure;

[0019] Step (5), installing connecting members;

[0020] Step (6), base gap glue filling: filling adhesive and curing at the gap between the insertion hole barrel of the base and the insertion end of the lattice member;

[0021] Step (7), removing the scaffold.

[0022] Compared with the prior art, the active-bending-based self-forming pedestrian arch bridge structure and the construction method thereof have the following beneficial effects:

[0023] The active-bending-based self-forming pedestrian arch bridge structure and the construction method thereof provided by the application, each lattice member serving as an arch rib is actively bent from several first slender rods of the same length, and several first slender rods are actively bent and inserted into the base in sequence during construction, and then the first lattice member nodes are used to constrain them into a whole member, which can not only avoid the problem that large-size cross-section members cannot be directly bent by manpower, but also significantly reduce the internal stress caused by bending in the member, thereby reducing the structure and construction risks. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 The figure is a structural schematic diagram of the active-bending-based self-forming pedestrian arch bridge structure.

[0025] Figure 2 The figure is a structural schematic diagram of the base of the active-bending-based self-forming pedestrian arch bridge structure.

[0026] Figure 3 The figure is a construction process schematic diagram of the active-bending-based self-forming pedestrian arch bridge structure.

[0027] Figure 4 The figure is a structural schematic diagram of step (1) in the construction process of the active-bending-based self-forming pedestrian arch bridge structure;

[0028] Figure 5 The figure is a structural schematic diagram of step (2) in the construction process of the active-bending-based self-forming pedestrian arch bridge structure;

[0029] Figure 6This is a schematic diagram of step (3) in the construction process of the self-forming pedestrian arch bridge structure based on active bending, which is involved in this invention.

[0030] Figure 7 This is a schematic diagram of step (4) in the construction process of the self-forming pedestrian arch bridge structure based on active bending, which is involved in this invention.

[0031] Figure 8 This is a schematic diagram of step (5) in the construction process of the self-forming pedestrian arch bridge structure based on active bending, which is involved in this invention. Detailed Implementation

[0032] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0033] This invention provides a self-forming pedestrian arch bridge structure based on active bending, such as... Figure 1 As shown, the structure includes at least two lattice members 100 with the same span, width, and height as arch ribs and bases 200 fixed to the ground at both ends of the lattice members 100. Each lattice member 100 includes several first slender rods 110 that are actively bent to form arch ribs (e.g., ...). Figure 3 As shown, a plurality of connecting members 300 are provided between two adjacent lattice members 100 to connect the two lattice members 100.

[0034] exist Figure 1 The invention is illustrated by providing two lattice members 100 with the same span, width and height as examples. However, it may also include three, four or more such lattice members 100, which is not a limitation.

[0035] According to the present invention, in the self-forming pedestrian arch bridge structure based on active bending provided by the present invention, each lattice member 100 further includes several second slender rods 120 formed by active bending at both ends, each with a length less than half that of the first slender rod 110. The number of second slender rods 120 at both ends of each lattice member 100 is the same, so as to form an arch rib that is thick at both ends and thin in the middle.

[0036] Specifically, as an example of the present application, each lattice member 100 includes, for example, 25-35 (for example, 32) first elongated rods 110 and, for example, 10-20 (for example, 16) second elongated rods 120 at each end. According to the scheme of the present application, the 25-35 first elongated rods 110 are actively bent to form arch rib shapes, respectively, and are constrained to form an integral member as one lattice member 100, and 10-20 second elongated rods 120 are actively bent at both ends of the two end portions forming the lattice member 100, respectively, and are constrained at both ends thereof, thereby forming a lattice member 100 with thick ends and a thin middle as an arch rib, so that the requirements of pedestrians normally passing through the pedestrian arch bridge can be better met. In each lattice member 100, the number of first elongated rods 110 and second elongated rods 120 is not strictly limited.

[0037] Specifically, as an example of the present application, in the actively bent self-forming pedestrian arch bridge structure provided by the present application, the number of connecting members 300 is 10-16 (for example, 12), and every 2 form a pair to form 5-8 pairs (for example, 6 pairs) of connecting members 310 uniformly spaced and symmetrically distributed on the entire bending arc of the two lattice members 100, and each pair of connecting members 310 is arranged on the upper and lower sides of the lattice member 100. The number of connecting members 300 is not strictly limited.

[0038] According to the scheme of the present application, in the actively bent self-forming pedestrian arch bridge structure provided by the present application, the purpose of providing connecting members 300 is to improve the overall bending stiffness of the pedestrian arch bridge structure, and in the actual construction process, connecting members 300 need to be installed at corresponding positions between two lattice members 100, so that the two lattice members 100 are connected to each other to form an integral whole. In the actual engineering application of the pedestrian arch bridge structure provided by the present application, the ultimate bearing capacity of the pedestrian arch bridge is controlled by the buckling of the lattice members 100 forming the arch rib, and the connecting members 300 can effectively improve the out-of-plane buckling capacity of the lattice members 100 forming the arch rib. Therefore, the connecting members 300 can effectively improve the ultimate bearing capacity of the pedestrian arch bridge.

[0039] Specifically, as an example of the present application, in the self-forming pedestrian arch bridge structure based on active bending provided by the present application, in order to facilitate the formation of the arch rib that can be actively bent, the first slender rod member 110 and the second slender rod member 120 are both circular rods with a circular cross-section with a diameter of 12-20 mm (for example, 16 mm); the length of the first slender rod member 110 is 8000-14000 mm (for example, 11000 mm), the length of the second slender rod member 120 is 3500-6500 mm (for example, 5000 mm), and the connecting member 300 is a circular rod with a circular cross-section with a length of 1800-2000 mm (for example, 1900 mm); the span of each lattice member 100 formed is 6200-7200 mm (for example, 6800 mm), the width is 1200-2200 mm (for example, 1800 mm), and the span-to-height ratio is 3200-4200 mm (for example, 3800 mm).

[0040] According to the scheme of the present application, in the self-forming pedestrian arch bridge structure based on active bending provided by the present application, a first lattice member node 400 is provided on each lattice member 100 at the connection position of the plurality of connecting members 300, and the first lattice member node 400 is tied on the lattice member 100 to constrain the plurality of first slender rod members 110 and second slender rod members 120 that are actively bent respectively into a whole member and form a lattice member 100 that can deform cooperatively as an arch rib. During installation, the installation is generally in the order from left to right (or from right to left), so that the length of the rod between adjacent nodes can be adjusted to reduce the internal stress of the rod.

[0041] In some embodiments, a second lattice member node 500 is also provided between the two adjacent first lattice member nodes 400, and the second lattice member node 500 is tied on the lattice member 100 and can serve as an auxiliary constraint for forming a whole member. Therefore, the second lattice member node 500 can be thinner than the first lattice member node 400.

[0042] According to the scheme of the present application, in the self-forming pedestrian arch bridge structure based on active bending provided by the present application, in order to facilitate the formation of the arch rib that can be actively bent, the first slender rod member 110, the second slender rod member 120, and the connecting member 300 are all circular rods made of glass fiber reinforced plastic (GFRP) material. According to known technology, glass fiber reinforced plastic (GFRP) has the advantages of high specific strength and designable strength, which can facilitate the formation of the arch rib that can be actively bent, and the whole arch rib formed has a slender and beautiful appearance.

[0043] It should be noted that the cross-sectional shape of the first slender rod 110, the second slender rod 120, and the connecting member 300 is set to be circular, which is more conducive to forming an actively bending arch rib. They can also be set to other cross-sectional shapes such as square, and their cross-sectional shapes can be changed at will. Complex curved surface configurations can be achieved through the design of the arch rib's bending stiffness. Furthermore, compared to a single arch rib, the slender first slender rod 110, the second slender rod 120, and the connecting member 300 can effectively solve the problem of prefabricated curved surface components being easily damaged during transportation.

[0044] According to the present invention, in the self-forming pedestrian arch bridge structure based on active bending provided by the present invention, the first lattice component node 400 and the second lattice component node 500 are both made of steel wire cutting, and the inner core is made of PLA material through 3D printing process. This design is more conducive to reducing the overall weight of the node, and the toughness can better bind and constrain the first slender rod 110 and the second slender rod 120.

[0045] According to the solution of the present invention, in the self-forming pedestrian arch bridge structure based on active bending provided by the present invention, such as Figure 2 As shown, the base 200 includes a fixing hole 210 for an expansion bolt 230 to be driven into the cement floor and an insertion hole 220 for a first slender rod 110 and a second slender rod 120 to be inserted. The base 200 can be made of steel.

[0046] According to the present invention, the present invention also provides a method for constructing a self-forming pedestrian arch bridge structure based on active bending as described above, such as... Figure 3 As shown, it includes the following steps:

[0047] Step (1), Positioning and fixing the base: Based on the dimensions of the various components constituting the self-forming pedestrian arch bridge structure based on active bending, determine the specific locations of at least four bases on the construction site. After passing expansion bolts through the fixing holes 210 of the base 200 and driving them into the cement ground, fix the base 200 to the ground, forming... Figure 4 The structure shown;

[0048] This step also includes the step of foundation treatment at the corresponding location, including compacting the soil to increase its density and bearing capacity, pouring concrete and curing it.

[0049] Step (2), scaffolding erection: Cup-lock scaffolding is erected on both sides and inside the human-shaped arch bridge. The cup-locks and horizontal bars ensure overall structural stability and a high safety factor. The scaffolding meets the requirements for workers to safely install nodes and connecting components in the air. Scaffolding is erected in areas requiring workers to work in the air to ensure safe node installation, forming... Figure 5 The structure shown;

[0050] Step (3), inserting lattice members: several first slender rods 110 are actively bent and sequentially inserted into the insertion holes 220 of the base 200 to restrict the displacement and rotation of both ends, and only displace along the length of the rod, and then several second slender rods 120 are sequentially inserted, forming Figure 6 the structure shown in the figure;

[0051] Step (4), installing lattice member nodes: according to the size and spacing of the connecting member 300 constituting the actively bent self-forming pedestrian arch bridge structure, the first lattice member node 400 and the second lattice member node 500 are installed to form the lattice member 100 with thick ends and thin middle as the arch rib, and the several first slender rods 110 and the several second slender rods 120 are connected to each other, and the plurality of nodes are connected to each other, forming the lattice member 100 capable of cooperative deformation to bear external action, forming Figure 7 the structure shown in the figure; in the actual construction process, the first lattice member node 400 and the second lattice member node 500 are generally installed from left to right (or from right to left) in sequence, so that the length of the rod between adjacent nodes can be adjusted, and the internal stress of the rod can be reduced;

[0052] Step (5), installing connecting members: each pair of connecting members 310 is arranged on both sides of the corresponding position of the two adjacent lattice members 100, and several pairs of connecting members 310 are installed on the entire curved arc of the two adjacent lattice members 100 at uniform intervals and symmetrically distributed, forming Figure 8 the structure shown in the figure, so that the two adjacent lattice members 100 are connected to each other to form a whole and a spatial structure, thereby improving the overall bending stiffness of the connecting member 300;

[0053] Step (6), base gap glue filling: filling adhesive in the gap between the insertion hole 220 cylinder of the base 200 and the insertion end of the lattice member 100 and curing, so that the base 200 and the lattice member 100 form a whole, effectively restricting the displacement and rotation of the end of the lattice member 100;

[0054] Step (7), removing the scaffold: after the pedestrian arch bridge is assembled, the previously built scaffold is sequentially removed.

[0055] The application provides a self-forming pedestrian arch bridge structure based on active bending and a construction method thereof. Each lattice member serving as an arch rib is formed by active bending of a plurality of slender rods with the same length. In the construction, the plurality of slender rods are sequentially actively bent and inserted into a base, and then constrained into an integral member by a lattice member node. The active bending process of the slender rods can be completed by manpower, without the need of large mechanical equipment. The problem that a large-size cross-section member cannot be directly bent by manpower can be avoided. The material and shape and size of the slender rods can significantly reduce internal stress caused by bending in the member, and reduce the structural and construction risks.

[0056] The above only describes the preferred embodiments of the application. It should be noted that those skilled in the art can make several improvements and refinements without departing from the principles of the application. These improvements and refinements should also be considered as the protection scope of the application.

Claims

1. A self-forming pedestrian arch bridge structure based on active bending, characterized in that, It includes at least two lattice members with the same span, width and height as arch ribs and bases fixed to the ground at both ends of the lattice members. Each lattice member includes several first slender rods that are actively bent to form arch ribs. Several connecting members are provided between two adjacent lattice members to connect the two lattice members.

2. The self-forming pedestrian arch bridge structure based on active bending according to claim 1, characterized in that, Each lattice member also includes several second slender rods at both ends, each actively bent and less than half the length of the first slender rod. The number of second slender rods at both ends of each lattice member is the same, so as to form an arch rib that is thick at both ends and thin in the middle.

3. The self-forming pedestrian arch bridge structure based on active bending according to claim 2, characterized in that, Each lattice member comprises 25-35 first slender members and 10-20 second slender members at each end.

4. The self-forming pedestrian arch bridge structure based on active bending according to claim 3, characterized in that, The number of connecting members is 10-16, with 2 members forming a pair to form 5-8 pairs of connecting members that are evenly spaced and symmetrically distributed along the entire curved arc of the two lattice members. Each pair of connecting members is arranged on the upper and lower sides of the lattice member.

5. The self-forming pedestrian arch bridge structure based on active bending according to claim 4, characterized in that, Both the first and second slender rods are circular rods with a diameter of 12-20 mm; the length of the first slender rod is 8000-14000 mm, the length of the second slender rod is 3500-6500 mm, and the connecting member is a circular rod with a length of 1800-2000 mm. Each lattice member has a span of 6200-7200 mm, a width of 1200-2200 mm, and a span height of 3200-4200 mm.

6. The self-forming pedestrian arch bridge structure based on active bending according to claim 5, characterized in that, On each lattice member, at the connection point with the plurality of connecting members, a first lattice member node is provided, and the first lattice member node is tied to the lattice member.

7. The self-forming pedestrian arch bridge structure based on active bending according to claim 6, characterized in that, A second lattice component node is provided between two adjacent first lattice component nodes, and the second lattice component node is tied to the lattice component.

8. The self-forming pedestrian arch bridge structure based on active bending according to claim 7, characterized in that, The first lattice member node is thicker than the second lattice member node.

9. The self-forming pedestrian arch bridge structure based on active bending according to any one of claims 2-8, characterized in that, The first slender rod, the second slender rod, and the connecting member are all round rods made of glass fiber reinforced resin composite material (GFRP), and the base is made of steel.

10. A method for constructing a self-forming pedestrian arch bridge structure based on active bending as described in any one of claims 2-9, characterized in that, Includes the following steps: Step (1), Positioning and fixing the base: Based on the dimensions of each component constituting the self-forming pedestrian arch bridge structure based on active bending, determine the specific locations of at least four bases on the construction site, pass expansion bolts through the fixing holes of the bases and drive them into the cement ground, and then fix the bases on the ground. Step (2), scaffolding: Cup-lock scaffolding is used to build on both sides and inside the human-shaped arch bridge. The cup-lock scaffolding is connected with horizontal bars to ensure the overall structure is stable and has a high safety factor. Step (3), inserting lattice components: actively bend several first slender rods and insert them into the insertion holes of the base in sequence, and then insert several second slender rods in sequence; Step (4), Install lattice component nodes: Install the first lattice component node and the second lattice component node according to the size and spacing of the connecting components constituting the self-forming pedestrian arch bridge structure based on active bending. Step (5), install the connecting components; Step (6), grouting the base gap: grout adhesive into the gap between the insertion hole cylinder of the base and the insertion end of the lattice component and allow it to cure; Step (7): Dismantle the scaffolding.

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