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

Abstract

The invention 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 span height as arch ribs and bases positioned at two end parts of the lattice members and fixed on the ground, each lattice type component comprises a plurality of first long and thin rod pieces which are actively bent to form arch ribs respectively. The invention further provides a construction method of the self-forming pedestrian arch bridge structure based on active bending. Each lattice type component serving as an arch rib is formed by actively bending a plurality of first long and thin rod pieces with the same length, during construction, the first long and thin rod pieces are sequentially and actively bent and inserted into a base, and then the first lattice type component nodes are used for restraining the first long and thin rod pieces into an integral component; the problem that a large-size section component cannot be directly bent through manpower can be avoided, the internal stress caused by bending in the component can be remarkably reduced, and the structure and construction risks are reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of civil engineering, and in particular relates to a self-forming pedestrian arch bridge structure based on active bending and a construction method thereof. Background Art

[0002] Active bending refers to the process of bending originally straight rods, plates, membranes and other components into curved or curved geometric shapes under the action of external forces through elastic deformation. Self-forming refers to the process in which the above components can naturally form a shape consistent with the shape pre-set by the architect without additional processing or forming steps, only through active bending. Using the concepts of active bending and self-forming, spatial structures with complex curved shapes can be built with multiple slender rods. In engineering, self-forming is generally achieved through variable-section components, that is, multiple slender rods form lattice components, which makes it convenient to adjust the cross-sectional size of the components by increasing or decreasing the number of rods. If the above lattice components are directly actively bent, on the one hand, a large external force is required, that is, the construction process cannot be completed by manpower; on the other hand, there are significant internal stresses in the components, which poses a greater structural and construction risk. Summary of the invention

[0003] In view of the defects of the prior art, the purpose of the present invention is to provide a self-forming pedestrian arch bridge structure based on active bending and a construction method thereof, so as to solve the problems of large external force required and great risks in the construction process of the self-forming structure based on active bending.

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

[0005] In the first aspect, the present invention provides a self-forming pedestrian arch bridge structure based on active bending, comprising at least two lattice components with the same span, width and span height as arch ribs and bases fixed on the ground at two ends of the lattice components, each lattice component comprising a plurality of first slender rods that are actively bent to form arch ribs, and a plurality of connecting components connecting the two lattice components are provided between two adjacent lattice components.

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

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

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

[0009] Preferably, the first slender rod and the second slender rod are both round rods with a circular cross-section 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, the connecting member is a round rod with a circular cross-section with a length of 1800-2000 mm, and each lattice member formed has a span of 6200-7200 mm, a width of 1200-2200 mm, and a span height of 3200-4200 mm.

[0010] Preferably, a first lattice component node is provided on each lattice component at a connection portion with the plurality of connection components, and the first lattice component node is bundled on the lattice component.

[0011] Preferably, a second lattice component node is further provided between two adjacent first lattice component nodes, and the second lattice component node is bundled on the lattice component.

[0012] Preferably, the first lattice component nodes are thicker than the second lattice component nodes.

[0013] Preferably, 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; the first lattice component node and the second lattice component node are both made of steel wire cutting, and the inner core is made of PLA material through a 3D printing process.

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

[0015] Step (1), positioning and fixing the base: determining the specific positions of at least four bases on the construction site according to the sizes of the components constituting the active bending-based self-forming pedestrian arch bridge structure, passing expansion bolts through the fixing holes of the bases and driving them into the cement floor, and fixing the bases on the ground;

[0016] Step (2), building scaffolding: using cup-shaped scaffolding to build on both sides and inside of the human-shaped arch bridge, connecting the cup-shaped scaffolding with the crossbar to ensure that the overall structure is stable and has a high safety factor;

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

[0018] Step (4), installing lattice component nodes: installing a first lattice component node and a 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;

[0019] Step (5), installing the connecting member;

[0020] Step (6), pouring glue into the gap of the base: pouring adhesive into the gap between the insertion hole cylinder of the base and the insertion end of the lattice component and curing;

[0021] Step (7), dismantle the scaffolding.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The present invention provides a self-forming pedestrian arch bridge structure based on active bending and a construction method thereof. Each lattice component serving as an arch rib is formed by actively bending a plurality of first slender rods of the same length. During construction, the plurality of first slender rods are actively bent in sequence and inserted into a base, and then constrained into an integral component by using the first lattice component nodes. This can avoid the problem that large-size cross-section components cannot be directly bent by manpower, and can also significantly reduce the internal stress in the component caused by bending, thereby reducing structural and construction risks. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

[0027] Figure 4 It is a structural schematic diagram of step (1) in the construction process of the self-forming pedestrian arch bridge structure based on active bending according to the present invention;

[0028] Figure 5 It is a structural schematic diagram of step (2) in the construction process of the self-forming pedestrian arch bridge structure based on active bending according to the present invention;

[0029] Figure 6It is a structural schematic diagram of step (3) in the construction process of the self-forming pedestrian arch bridge structure based on active bending involved in the present invention;

[0030] Figure 7 It is a structural schematic diagram of step (4) in the construction process of the self-forming pedestrian arch bridge structure based on active bending involved in the present invention;

[0031] Figure 8 It is a structural schematic diagram of step (5) in the construction process of the self-forming pedestrian arch bridge structure based on active bending involved in the present invention. DETAILED DESCRIPTION

[0032] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0033] The present invention provides a self-forming pedestrian arch bridge structure based on active bending, such as Figure 1 As shown, at least two lattice components 100 with the same span, width and span height are used as arch ribs and bases 200 fixed on the ground at two ends of the lattice components 100. Each lattice component 100 includes a plurality of first slender rods 110 (such as Figure 3 As shown), a plurality of connecting members 300 connecting the two lattice components 100 are provided between two adjacent lattice components 100 .

[0034] exist Figure 1 In the figure, two lattice components 100 with the same span, width and span height are given as examples to illustrate the solution of the present invention, and three, four or more such lattice components 100 may also be included, which is not limited here.

[0035] 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, both ends of each lattice component 100 also include a plurality of second slender rods 120 with a length less than half of the first slender rod 110, which are formed by active bending respectively. The number of the second slender rods 120 at both ends of each lattice component 100 is the same to form an arch rib that is thick at both ends and thin in the middle.

[0036] Specifically, as an example of the present invention, each lattice structure 100 includes, for example, 25-35 (for example, 32) first slender rods 110 and, for example, 10-20 (for example, 16) second slender rods 120 at each end. According to the solution of the present invention, these 25-35 first slender rods 110 are respectively actively bent to form an arch rib shape, and are constrained to form an integral component as a lattice structure 100, and 10-20 second slender rods 120 are respectively actively bent at the two ends of the lattice structure 100 and constrained at both ends, thereby forming a lattice structure 100 with thick ends and thin middle as an arch rib, which can better meet the requirements of pedestrians passing through the pedestrian arch bridge normally. In each lattice structure 100, the number of first slender rods 110 and second slender rods 120 is not strictly limited.

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

[0038] 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, the purpose of setting the connecting member 300 is to improve the overall bending stiffness of the pedestrian arch bridge structure. In the actual construction process, it is necessary to install the connecting member 300 at the corresponding position between the two lattice members 100, so that the two lattice members 100 are interconnected and form a whole. In the actual engineering application of the pedestrian arch bridge structure provided by the present invention, the ultimate bearing capacity of the pedestrian arch bridge is controlled by the buckling of the lattice member 100 forming the arch rib, and the connecting member 300 can effectively improve the out-of-plane buckling capacity of the lattice member 100 forming the arch rib. Therefore, the connecting member 300 can effectively improve the ultimate bearing capacity of the pedestrian arch bridge.

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

[0040] 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, a first lattice member node 400 is provided on each lattice member 100 at the connection position with a plurality of connecting members 300, and the first lattice member node 400 is bundled on the lattice member 100 to constrain a plurality of first slender rods 110 and second slender rods 120 that are respectively actively bent into an integral member and form a lattice member 100 that can be deformed in coordination as an arch rib. During installation, it is generally installed in a sequence from left to right (or from right to left), so that the length of the rods between adjacent nodes can be adjusted and the internal stress of the rods can be reduced.

[0041] In some embodiments, a second lattice component node 500 is provided between two adjacent first lattice component nodes 400 . The second lattice component node 500 is bundled on the lattice component 100 and can serve as an auxiliary constraint for forming an integral component. Therefore, the second lattice component node 500 can be set to be thinner than the first lattice component node 400 .

[0042] 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, in order to facilitate the formation of arch ribs that can be actively bent, the first slender rod 110, the second slender rod 120 and the connecting member 300 are all round rods made of glass fiber reinforced resin composite material (GFRP). According to well-known technology, glass fiber reinforced resin composite material (GFRP) has the advantages of high specific strength and strong designability, which can facilitate the formation of arch ribs that can be actively bent. The formed overall arch ribs have slender and beautiful appearance characteristics.

[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 can be more conducive to forming actively curved arch ribs, and can also be set to other cross-sectional shapes such as square. The cross-sectional shape can be changed at will, and a complex curved surface configuration can be achieved through the designed bending stiffness of the arch rib. Moreover, compared with 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 solution of 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 a 3D printing process. This design is more conducive to reducing the overall dead weight of the node, and the toughness can better bundle 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, as Figure 2 As shown, the base 200 includes a fixing hole 210 for driving an expansion bolt 230 into a cement floor and an insertion hole 220 for inserting a first slender rod 110 and a second slender rod 120 . The base 200 may be made of steel.

[0046] According to the solution of 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, the following steps are included:

[0047] Step (1), positioning and fixing the base: determining the specific positions of at least four bases on the construction site according to the sizes of the various components constituting the self-forming pedestrian arch bridge structure based on active bending, inserting the expansion bolts through the fixing holes 210 of the base 200 and driving them into the cement floor, and fixing the base 200 on the ground to form Figure 4 The structure shown;

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

[0049] Step (2), build scaffolding: Use cup-shaped scaffolding to build on both sides and inside of the human-shaped arch bridge, and connect it with the cup-shaped scaffolding and crossbars to ensure that the overall structure is stable and has a high safety factor. The scaffolding meets the requirements of workers to safely install nodes and connecting components in the air. Scaffolding is built in the parts where workers are required to work in the air to ensure that workers can safely install nodes, forming Figure 5 The structure shown;

[0050] Step (3), inserting the lattice structure: actively bend a plurality of first slender rods 110 and insert them into the insertion holes 220 of the base 200 in sequence to limit the displacement and rotation angle of both ends so that they can only move along the length direction of the rod, and then insert a plurality of second slender rods 120 in sequence to form Figure 6 The structure shown;

[0051] Step (4), installing lattice component nodes: installing the first lattice component node 400 and the second lattice component node 500 according to the size and spacing of the connection component 300 of the self-forming pedestrian arch bridge structure based on active bending, so as to form a lattice component 100 with thick ends and thin middle as an arch rib, and making a plurality of first slender rods 110 and a plurality of second slender rods 120 interconnected, and interconnected by a plurality of nodes, so as to form a lattice component 100 capable of cooperative deformation to withstand external effects, forming Figure 7 The structure shown; in the actual construction process, the first lattice component node 400 and the second lattice component node 500 are generally installed in 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;

[0052] Step (5), installing the connecting members: each pair of connecting members 310 is divided into upper and lower sides and arranged at corresponding positions of two adjacent lattice components 100, and several pairs of connecting members 310 are installed at even intervals and symmetrically distributed on the entire curved arc of the two adjacent lattice components 100 to form Figure 8 The structure shown enables two adjacent lattice components 100 to be interconnected to form an integral and spatial structure, thereby improving the overall bending stiffness of the connecting component 300;

[0053] Step (6), gluing the gap of the base: gluing the adhesive into the gap between the insertion hole 220 of the base 200 and the insertion end of the lattice component 100 and curing the adhesive, so that the base 200 and the lattice component 100 form a whole, effectively restraining the end displacement and rotation angle of the lattice component 100;

[0054] Step (7), dismantling the scaffolding: After the pedestrian arch bridge is assembled, the previously constructed scaffolding can be dismantled in sequence.

[0055] The present invention provides a self-forming pedestrian arch bridge structure based on active bending and a construction method thereof. Each lattice component serving as an arch rib is formed by actively bending a plurality of slender rods of the same length. During construction, the plurality of slender rods are actively bent in turn and inserted into a base, and then constrained into an integral component by lattice component nodes. The active bending process of the slender rods can be completed manually without the need for large-scale mechanical equipment, which can avoid the problem of being unable to directly bend large-size cross-section components by manpower. The material, shape and size of the slender rods can also significantly reduce the internal stress in the component caused by bending, thereby reducing structural and construction risks.

[0056] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A self-forming pedestrian arch bridge structure based on active bending, characterized in that: The invention comprises at least two lattice components with the same span, width and span height as arch ribs and bases fixed on the ground at two ends of the lattice components. Each lattice component comprises a plurality of first slender rods which are actively bent to form arch ribs. A plurality of connecting components connecting the two adjacent lattice components are arranged between the two adjacent lattice components.

2. The self-forming pedestrian arch bridge structure based on active bending according to claim 1 is characterized in that: Both ends of each lattice structure also include a plurality of second slender rods which are actively bent and have a length less than half of the first slender rods. The number of second slender rods at both ends of each lattice structure is the same to form an arch rib which 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 is characterized in that: Each lattice member includes 25-35 first elongated rods and 10-20 second elongated rods at each end.

4. The self-forming pedestrian arch bridge structure based on active bending according to claim 3 is characterized in that: The number of the connecting members is 10-16, and every 2 members form a pair to form 5-8 pairs of connecting members that are evenly spaced and symmetrically distributed on the entire curved arc of the two lattice members, and 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 is characterized in that: The first slender rod and the second slender rod are both round rods with a circular cross-section and 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, the connecting member is a round rod with a circular cross-section and a length of 1800-2000 mm, and each lattice member formed 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 1 is characterized in that: On each lattice component, a first lattice component node is provided at a connection portion with the plurality of connection components, and the first lattice component node is bundled on the lattice component.

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

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

9. The self-forming pedestrian arch bridge structure based on active bending according to any one of claims 1 to 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; the first lattice component node and the second lattice component node are both made of steel wire cutting, and the inner core is made of PLA material through a 3D printing process.

10. A method for constructing a self-forming pedestrian arch bridge structure based on active bending according to any one of claims 1 to 9, characterized in that: The steps include: Step (1), positioning and fixing the base: determining the specific positions of at least four bases on the construction site according to the sizes of the components constituting the active bending-based self-forming pedestrian arch bridge structure, passing expansion bolts through the fixing holes of the bases and driving them into the cement floor, and fixing the bases on the ground; Step (2), building scaffolding: using cup-shaped scaffolding to build on both sides and inside of the human-shaped arch bridge, connecting the cup-shaped scaffolding with the crossbar to ensure that the overall structure is stable and has a high safety factor; Step (3), inserting the lattice structure: actively bending a plurality of first slender rods and inserting them into the insertion holes of the base in sequence, and then inserting a plurality of second slender rods in sequence; Step (4), installing lattice component nodes: installing a first lattice component node and a 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), installing the connecting member; Step (6), pouring glue into the gap of the base: pouring adhesive into the gap between the insertion hole cylinder of the base and the insertion end of the lattice component and curing; Step (7), dismantle the scaffolding.

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