A device and method suitable for precise positioning of steel pull rods of arch feet of steel truss arch bridges

Abstract

The application relates to a device and method suitable for precise positioning of steel pull rods of arch feet of steel truss arch bridges, the device comprising a first positioning steel plate and a second positioning steel plate, the length of the steel pull rod in the concrete arch support foundation being L, L being divided into n sections, the first positioning steel plate being arranged at a starting point node, the second positioning steel plate being arranged at intermediate nodes, and a lower bearing plate being arranged at an end point node, a plurality of through holes being arranged on the first positioning steel plate and the second positioning steel plate, the through holes being used for the steel pull rod to pass through, the positions of the first positioning steel plate and the second positioning steel plate being fixed through four coordinates, steel frame structures being arranged between the first positioning steel plate and the second positioning steel plate, adjacent second positioning steel plates, the second positioning steel plates and the lower bearing plate, and the steel frame structures being welded with the first positioning steel plate and the second positioning steel plate. The application can position the steel pull rod, avoid the steel pull rod from being deflected under the dead weight or being deformed under the impact of concrete pouring, and ensure that the long steel pull rod is perpendicular to the upper and lower bearing plates during construction.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bridges, in particular to a device and method for precise positioning of steel rods of arch feet of steel truss arch bridges. BACKGROUND

[0002] Large-span steel truss arch bridges need to transmit the dead load and live load, wind load and other operating period loads of arch ribs, bridge systems and the like to arch base foundations through arch foot joint segments, and the arch feet bear large axial forces and bending moments. The steel structure of arch ribs of steel truss arches and steel box arches and the concrete structure of arch bases are connected by arch foot connecting structures to complete the transition connection of steel-concrete, and the arch foot connecting structures mainly have two types: one is a bearing pressure shear transmission steel-concrete composite connecting structure, and the other is a complete bearing pressure steel-concrete composite connecting structure.

[0003] The working principle of the complete bearing pressure steel-concrete composite connecting structure is that the axial force of the chord is transmitted to the concrete arch base through the bearing plate grid structure, and the chord bending moment is balanced by the external prestress of the chord, the stress mode is clear, and the force transmission path is clear. The complete bearing pressure steel-concrete composite connecting structure is combined with the arch foot chord, the prestress tension is performed on the outside of the chord, the construction and manufacturing are simple, the internal force transmission is clear, the structure is novel, and the characteristics are outstanding. However, due to the large number of steel rods, the arch foot structure is in a large-angle inclined state, and the arch foot inclination plays a controlling role in the arch linearity of the whole bridge, directly affecting the safety performance of the structure, so the precise positioning of the bearing plate and the steel rod is particularly important.

[0004] At present, the conventional method for this place is to give the coordinates of the four corner points of the arch foot bearing plate, the elevation and the main chord inclination angle of the arch foot to position the bearing plate, but the positioning of the steel rod is only performed by the upper and lower bearing plates. Under the action of factors such as the self-weight of the long steel rod and the pouring of concrete, it is difficult to ensure that the steel rod is perpendicular to the upper and lower bearing plates during construction, resulting in a deflection angle between the steel rod and the flat top surface of the box, and the prestress effect is reduced. Therefore, a method for precise positioning of steel rods of arch feet of steel truss arch bridges is needed to solve this problem. SUMMARY

[0005] The present application relates to the technical field of bridges, in particular to a device and method for precise positioning of steel rods of arch feet of steel truss arch bridges.

[0006] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows:

[0007] In a first aspect, the present application provides a device suitable for precise positioning of steel pull rods of arch feet of steel truss arch bridges, which comprises a rectangular first positioning steel plate and a plurality of rectangular second positioning steel plates, the length of the steel pull rod in the concrete abutment foundation is L, L is divided into n segments, the first positioning steel plate is arranged at the starting node, the second positioning steel plate is arranged at each intermediate node, and a lower bearing plate is arranged at the terminal node, a plurality of through holes are respectively arranged on the first positioning steel plate and the second positioning steel plate in a position matching manner, the through holes are used for the steel pull rod to pass through, the positions of the first positioning steel plate and the second positioning steel plate are fixed by the coordinates of the four corners, steel frame structures are arranged between the first positioning steel plate and the second positioning steel plate, between adjacent second positioning steel plates, and between the second positioning steel plate and the lower bearing plate, and the steel frame structures are welded to the corresponding first positioning steel plate and second positioning steel plate.

[0008] The top surface of the first positioning steel plate is attached to the bottom surface of the upper bearing plate, and the center coordinates, length, width and horizontal inclination angle θ of the upper bearing plate are generally provided, the center coordinates and horizontal inclination angle θ of the upper bearing plate determine the center coordinates and horizontal inclination angle θ of the first positioning steel plate, the coordinates of the four corners of the first positioning steel plate are determined according to the known center coordinates, length, width and horizontal inclination angle θ of the first positioning steel plate, and the coordinates of the four corners of each second positioning steel plate are determined by sequentially transmitting the length L and the length of each segment of the steel pull rod to the second positioning steel plate.

[0009] The device for precise positioning of steel pull rods of arch feet of steel truss arch bridges is used, the first positioning steel plate and the second positioning steel plate are arranged at intervals along the length direction of the steel pull rod, the through holes on the steel plate cooperate with the steel pull rod, so that the steel plate can limit the steel pull rod, avoid the steel pull rod from being deflected by its own weight or being deformed by the impact of concrete pouring, ensure that the longer steel pull rod is perpendicular to the upper and lower bearing plates during construction, thereby ensuring that the steel pull rod is perpendicular to the flat box top plane during construction, and thereby avoiding the loss of prestress of the steel pull rod caused by the non-perpendicularity of the steel pull rod and the flat box top plane, so that the steel pull rod works more effectively; the first positioning steel plate and the second positioning steel plate are positioned by the coordinates of the four corners, and then fixed by welding the steel frame structure, which can ensure the precise positioning of the angle of the arch foot bearing plate and the steel pull rod, thereby ensuring the precise positioning of the angle of the arch foot main chord, avoiding the deviation of the entire arch axis caused by small angle deviation, and ensuring the correct construction of the arch bridge line type and the structural safety; the first positioning steel plate, the second positioning steel plate and the steel frame structure are subsequently directly embedded in the concrete abutment foundation, and are bonded with the existing ordinary steel bars and concrete, which has an advantageous effect of resisting the pull of the steel pull rod.

[0010] As a preferred technical scheme of the present application, L is evenly divided into n segments, i.e. the length of each segment is L / n, facilitating the calculation of the coordinates of the four corners of the second positioning steel plate.

[0011] As a preferred technical scheme of the present application, the steel frame structure comprises horizontal fixing rods, vertical fixing rods and diagonal fixing rods, the horizontal fixing rods and the vertical fixing rods are welded to form a cubic frame, and the side surface of the cubic frame is welded with the diagonal fixing rods.

[0012] As a further preferred technical scheme of the present application, the side surface of the cubic frame is welded with a pair of X-shaped diagonal fixing rods.

[0013] As a preferred technical scheme of the present application, a row of through holes is arranged on the upper and lower parts and the left and right parts of the first positioning steel plate and the second positioning steel plate, respectively.

[0014] As a preferred technical scheme of the present application, the diameter of the through holes is 1mm-2mm larger than the diameter of the steel pull rod.

[0015] As a preferred technical scheme of the present application, the first positioning steel plate and the second positioning steel plate are connected with a scaffold, and the bottom of the scaffold is provided with a moving and adjusting component, which is used for horizontal movement and vertical lifting of the scaffold.

[0016] With this structure, on the one hand, the position of the first positioning steel plate and the second positioning steel plate can be adjusted through the horizontal movement and vertical lifting of the moving and adjusting component, and on the other hand, the scaffold can be directly embedded in the concrete abutment foundation in the subsequent process, and is bonded with the ordinary steel bars and concrete of the existing design, which is advantageous for the anti-pulling of the steel pull rod.

[0017] As a further preferred technical scheme of the present application, the scaffold comprises vertical support rods, horizontal support rods and diagonal support rods, the vertical support rods are arranged in a corresponding number of rows according to the number of the first positioning steel plates and the second positioning steel plates, each row comprises a plurality of vertical support rods, the top of the vertical support rods is connected with the corresponding first positioning steel plate or second positioning steel plate, the vertical support rods are connected through a plurality of horizontal support rods and a plurality of diagonal support rods, and the bottom of the vertical support rods is provided with the moving and adjusting component.

[0018] As a further preferred technical scheme of the present application, the moving and adjusting component comprises traveling wheels and a hydraulic lifting oil cylinder, the traveling wheels are used for the horizontal movement of the scaffold, and the hydraulic lifting oil cylinder is used for the vertical lifting of the scaffold.

[0019] In a second aspect, the present application also provides a steel truss arch bridge, comprising an abutment foundation, wherein the abutment foundation is embedded with the device for precise positioning of a steel rod for an arch foot of a steel truss arch bridge as described above, and the reinforcement in the abutment foundation is connected with the first positioning steel plate, the second positioning steel plate, the steel frame structure and / or the scaffold.

[0020] The steel truss arch bridge provided by the present application is characterized in that the first positioning steel plate and the second positioning steel plate are arranged at intervals along the length direction of the steel rod, and the through holes on the steel plates are matched with the steel rod, so that the steel plates can limit the steel rod, avoid the deformation of the steel rod caused by its own weight or the impact of concrete pouring, ensure that the long steel rod is kept vertical to the upper and lower bearing plates during construction, thereby ensuring that the steel rod is kept vertical to the flat top of the flat box during construction, and avoiding the loss of prestress of the steel rod caused by the non-verticality of the steel rod to the flat top of the flat box, so that the steel rod works more effectively. The first positioning steel plate and the second positioning steel plate are positioned by the coordinates of the four corners, and then the steel frame structure is welded to fix, which can ensure the precise positioning of the angle of the arch foot bearing plate and the steel rod, thereby ensuring the precise positioning of the angle of the main chord of the arch foot, avoiding the deviation of the overall arch axis caused by small angle deviation, and ensuring the correct construction of the arch bridge line and the structural safety. The scaffold, the first positioning steel plate, the second positioning steel plate and the steel frame structure are directly embedded in the concrete abutment foundation later, and are bonded with the ordinary reinforcement and concrete of the existing design, which has an advantageous effect of resisting uplift on the steel rod.

[0021] In a third aspect, the present application also provides a method for precise positioning of a steel rod for an arch foot of a steel truss arch bridge, which utilizes the device for precise positioning of a steel rod for an arch foot of a steel truss arch bridge as described above, and comprises the following steps:

[0022] S1, welding the first positioning steel plate, the second positioning steel plate and the steel frame structure to form an integral body;

[0023] S2, sequentially passing the steel rod through the through holes on the first positioning steel plate and the second positioning steel plate to form a positioning device;

[0024] S3, transporting the positioning device to the construction site, and adjusting the positioning device by the scaffold through the mobile adjusting component to precisely position the coordinates;

[0025] S4, after positioning, welding the scaffold with the first positioning steel plate and the second positioning steel plate respectively, and closing the position of the mobile adjusting component with concrete to fix and shape.

[0026] The method is suitable for precise positioning of the steel pull rod of the arch foot of the steel truss arch bridge, the first positioning steel plate and the second positioning steel plate are arranged along the length direction of the steel pull rod at intervals, the through holes on the steel plates are matched with the steel pull rod, so that the steel plates can limit the steel pull rod, the steel pull rod is prevented from being deflected under its own weight or being deformed due to the impact of concrete pouring, the long steel pull rod can be kept vertical to the upper and lower pressure plates during construction, so that the steel pull rod is kept vertical to the flat top of the flat box during construction, and the loss of the prestress of the steel pull rod caused by the non-perpendicularity of the steel pull rod to the flat top of the flat box is avoided, so that the steel pull rod works more effectively; the first positioning steel plate and the second positioning steel plate are positioned through the coordinates of the four corners, and then the steel frame structure is welded to be fixed, so that the angle of the arch foot pressure plate and the steel pull rod can be precisely positioned, the angle of the main chord of the arch foot can be precisely positioned, the deviation of the whole arch axis type caused by the small angle deviation is avoided, the correct construction of the arch bridge line type and the structural safety are ensured; the scaffold, the first positioning steel plate, the second positioning steel plate and the steel frame structure are directly pre-buried in the concrete arch seat foundation subsequently, are bonded with the ordinary steel bars and concrete of the existing design, and have the advantageous effect of resisting the pull of the steel pull rod.

[0027] In summary, due to the adoption of the above technical solutions, the present application has the following advantages:

[0028] 1、The device is suitable for precise positioning of the steel pull rod of the arch foot of the steel truss arch bridge, the first positioning steel plate and the second positioning steel plate are arranged along the length direction of the steel pull rod at intervals, the through holes on the steel plates are matched with the steel pull rod, so that the steel plates can limit the steel pull rod, the steel pull rod is prevented from being deflected under its own weight or being deformed due to the impact of concrete pouring, the long steel pull rod can be kept vertical to the upper and lower pressure plates during construction, so that the steel pull rod is kept vertical to the flat top of the flat box during construction, and the loss of the prestress of the steel pull rod caused by the non-perpendicularity of the steel pull rod to the flat top of the flat box is avoided, so that the steel pull rod works more effectively; the first positioning steel plate and the second positioning steel plate are positioned through the coordinates of the four corners, and then the steel frame structure is welded to be fixed, so that the angle of the arch foot pressure plate and the steel pull rod can be precisely positioned, the angle of the main chord of the arch foot can be precisely positioned, the deviation of the whole arch axis type caused by the small angle deviation is avoided, the correct construction of the arch bridge line type and the structural safety are ensured; the first positioning steel plate, the second positioning steel plate and the steel frame structure are directly pre-buried in the concrete arch seat foundation subsequently, are bonded with the ordinary steel bars and concrete of the existing design, and have the advantageous effect of resisting the pull of the steel pull rod.

[0029] 2, The method and steel truss arch bridge for precise positioning of the steel rod of the arch foot of the steel truss arch bridge, the first positioning steel plate and the second positioning steel plate are arranged along the length direction of the steel rod at intervals, the through hole on the steel plate cooperates with the steel rod, so that the steel plate can limit the steel rod, avoid the steel rod from being deflected under its own weight or being deformed by the impact of concrete pouring, ensure that the long steel rod is perpendicular to the upper and lower pressure plates during construction, thereby ensuring that the steel rod is perpendicular to the flat top of the flat box during construction, and thus avoiding the loss of prestress of the steel rod caused by the non-perpendicularity of the steel rod and the flat top of the flat box, so that the steel rod works more effectively, the first positioning steel plate and the second positioning steel plate are positioned through the coordinates of the four corners, and then the steel frame structure is fixed by welding, which can ensure the accurate positioning of the angle of the arch foot pressure plate and the steel rod, thereby ensuring the accurate positioning of the angle of the arch foot main chord, avoiding the deviation of the entire arch axis caused by small angle deviation, and ensuring the correct construction and structural safety of the arch bridge, the scaffold, the first positioning steel plate, the second positioning steel plate and the steel frame structure are directly embedded in the concrete arch base foundation subsequently, and are bonded with the existing ordinary steel bars and concrete, which has the advantage of resisting the pull of the steel rod. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 Structure diagram of the steel rod positioning device;

[0031] Figure 2 Figure 1 Sectional view of A-A direction in the figure;

[0032] Figure 3 Figure 1 Sectional view of B-B direction in the figure;

[0033] Figure 4 Figure 1 Sectional view of C-C direction in the figure.

[0034] Markings in the figure: 1-steel rod, 2-vertical support rod, 3-horizontal support rod, 4-oblique support rod, 5-moving adjusting part, 6-first positioning steel plate, 7-horizontal fixing rod, 8-vertical fixing rod, 9-oblique fixing rod, 10-second positioning steel plate, 11-lower pressure plate, 12-through hole. DETAILED DESCRIPTION

[0035] The application will be described in detail below with reference to the drawings.

[0036] In order to make the purpose, technical scheme and advantages of the present application clearer and more understandable, the present application will be further described in detail below with reference to the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application.​​​

[0037] Example 1

[0038] like Figures 1 to 4 As shown, the device for precise positioning of steel tie rods at the arch foot of a steel truss arch bridge according to the present invention includes scaffolding, a rectangular first positioning steel plate 6 and several rectangular second positioning steel plates 10.

[0039] In the concrete arch foundation, the length of the steel tie rod 1 is L, and L is evenly divided into n segments, that is, the length of each segment is L / n. In this embodiment, as shown... Figure 1 As shown, L is evenly divided into three segments. The first positioning steel plate 6 is set at the starting node (n0), the second positioning steel plate 10 is set at each of the middle nodes (n1 and n2), and the lower bearing plate 11 is set at the ending node. The top surface of the first positioning steel plate 6 is used to fit the bottom surface of the upper bearing plate.

[0040] like Figure 1 , Figure 3 and Figure 4 As shown, the positions of the first positioning steel plate 6 and the second positioning steel plate 10 can be fixed by the coordinates of the four corners. Generally, the center coordinates, length, width, and horizontal tilt angle θ of the upper bearing plate are provided. Once the center coordinates and horizontal tilt angle θ of the upper bearing plate are determined, the center coordinates and horizontal tilt angle θ of the first positioning steel plate 6 can be determined. Thus, the center coordinates P0 (Px0, Py0, Pz0), length H0, width J0, and horizontal tilt angle θ of the first positioning steel plate 6 are known, where Py0 = 0; the length H1 and width J1 of the second positioning steel plate 10; and the length Hi and width Ji of the lower bearing plate 11.

[0041] Then the coordinates of the four corners of the first positioning steel plate 6 can be determined as A0(Ax0,Ay0,Az0), B0(Bx0,By0,Bz0), C0(Cx0,Cy0,Cz0), D0(Dx0,Dy0,Dz0), where:

[0042] Point A0, Ax0=Px0-H0 / 2*cos(θ); Ay0=-J0 / 2; Az0=Pz0+H0 / 2*sin(θ)

[0043] Point B0, Bx0=Px0-H0 / 2*cos(θ); By0=J0 / 2; Bz0=Pz0+H0 / 2*sin(θ)

[0044] Point C0, Cx0=Px0+H0 / 2*cos(θ); Cy0=J0 / 2; Cz0=Pz0-H0 / 2*sin(θ)

[0045] D0, Dx0 = Px0 + H0 / 2*cos(θ); Dy0 = -J0 / 2; Dz0 = Pz0 - H0 / 2*sin(θ)

[0046] In combination with the length L of the steel tie rod 1 and the length L / n of each section of the steel tie rod 1, the coordinates of the four corners of each second positioning steel plate 10 are determined in turn, that is:

[0047] The center coordinates of the first second positioning steel plate 10 are P1(Px1, Py1, Pz1), and the coordinates of the four corners are A1(Ax1, Ay1, Az1), B1(Bx1, By1, Bz1), C1(Cx1, Cy1, Cz1), and D1(Dx1, Dy1, Dz1), wherein:

[0048] P1, Px1 = Px0 - L / n*sin(θ); Py1 = 0; Pz1 = Pz0 - L / n*cos(θ)

[0049] A1, Ax1 = Px1 - H1 / 2*cos(θ); Ay1 = -J1 / 2; Az1 = Pz1 + H1 / 2*sin(θ)

[0050] B1, Bx1 = Px1 - H1 / 2*cos(θ); By1 = J1 / 2; Bz1 = Pz1 + H1 / 2*sin(θ)

[0051] C1, Cx1 = Px1 + H1 / 2*cos(θ); Cy1 = J1 / 2; Cz1 = Pz1 - H1 / 2*sin(θ)

[0052] D1, Dx1 = Px1 + H1 / 2*cos(θ); Dy1 = -J1 / 2; Dz1 = Pz1 - H1 / 2*sin(θ)

[0053] In turn, the accurate coordinate values of the four corners of each second positioning steel plate 10 and the lower pressure plate 11 can be obtained, thereby positioning.

[0054] As shown in Figure 3 and Figure 4 A plurality of through holes 12 are provided on the first positioning steel plate 6 and the second positioning steel plate 10 respectively, and the through holes 12 are used for the steel tie rod 1 to pass through. In the present embodiment, one row of through holes 12 is provided on the upper and lower and left and right of the first positioning steel plate 6 and the second positioning steel plate 10, respectively, and the upper and lower include five through holes 12, and the left and right include six through holes 12, forming a rectangular mounting array; the diameter of the through hole 12 is 1mm-2mm larger than the diameter of the steel tie rod 1, facilitating the steel tie rod 1 to pass through.

[0055] Steel frame structures are arranged between the first positioning steel plates 6 and the second positioning steel plates 10, between the second positioning steel plates 10 adjacent to each other, and between the second positioning steel plates 10 and the lower bearing plates 11, and are welded to the corresponding first positioning steel plates 6 and second positioning steel plates 10. Specifically, as shown in Figure 1 and Figure 2 the steel frame structure includes horizontal fixing rods 7, vertical fixing rods 8, and inclined fixing rods 9, the horizontal fixing rods 7 and the vertical fixing rods 8 are welded to form a cubic frame, and a pair of X-shaped inclined fixing rods 9 are welded to the side surface of the cubic frame.

[0056] As shown in Figure 1 and Figure 2 the first positioning steel plates 6 and the second positioning steel plates 10 are connected to a scaffold, and the bottom of the scaffold is provided with a movement adjusting component 5 for horizontal movement and vertical lifting of the scaffold. Specifically, the scaffold includes vertical support rods 2, horizontal support rods 3, and inclined support rods 4, the vertical support rods 2 are arranged in corresponding rows according to the number of the first positioning steel plates 6 and the second positioning steel plates 10, each row includes a plurality of vertical support rods 2, the top of the vertical support rods 2 is connected to the corresponding first positioning steel plate 6 or second positioning steel plate 10, the vertical support rods 2 are connected by a plurality of horizontal support rods 3 and a plurality of inclined support rods 4, and the bottom of the vertical support rods 2 is provided with the movement adjusting component 5, which includes walking wheels for horizontal movement of the scaffold and a hydraulic lifting cylinder for vertical lifting of the scaffold. With this structure, on the one hand, the scaffold can adjust the position of the first positioning steel plate 6 and the second positioning steel plate 10 through horizontal movement and vertical lifting of the movement adjusting component 5, and on the other hand, the scaffold can be directly pre-buried in the concrete abutment foundation in the subsequent process, and is bonded with ordinary steel bars and concrete in the existing design, which is beneficial to the anti-pulling of the steel pull rod 1.

[0057] The device for precise positioning of the steel pull rod of the arch foot of the steel truss arch bridge provided by the embodiment is characterized in that the first positioning steel plate 6 and the second positioning steel plate 10 are arranged along the length direction of the steel pull rod 1 at intervals, the through hole 12 on the steel plate is matched with the steel pull rod 1, the steel pull rod 1 can be limited by the steel plate, the steel pull rod 1 is prevented from being deflected by its own weight or being deformed by the impact of concrete pouring, the steel pull rod 1 with a relatively long length is ensured to be perpendicular to the upper and lower pressure plates during construction, the steel pull rod 1 is ensured to be perpendicular to the top plane of the flat box during construction, and the pre-stress loss of the steel pull rod 1 caused by the non-perpendicularity of the steel pull rod 1 and the top plane of the flat box is avoided, so that the steel pull rod 1 works more effectively.

[0058] Embodiment 2

[0059] The steel truss arch bridge provided by the embodiment is characterized in that the arch foot of the steel truss arch bridge is provided with the device for precise positioning of the steel pull rod of the arch foot of the steel truss arch bridge, the first positioning steel plate 6, the second positioning steel plate 10 and the steel frame structure are directly embedded in the concrete arch base foundation, the first positioning steel plate 6, the second positioning steel plate 10 and the steel frame structure are bonded with ordinary steel bars and concrete according to the existing design, and the steel pull rod 1 is prevented from being pulled out.

[0060] In this embodiment, a steel truss arch bridge is constructed by spaced first positioning steel plates 6 and second positioning steel plates 10 along the length of the steel tie rod 1. The through holes 12 on the steel plates engage with the steel tie rod 1, allowing the steel plates to limit the movement of the steel tie rod 1. This prevents the steel tie rod 1 from deflecting under its own weight or deforming due to the impact of concrete pouring, ensuring that the longer steel tie rod 1 remains perpendicular to the upper and lower bearing plates during construction. This also ensures that the steel tie rod 1 is perpendicular to the top plane of the flat box girder, thus avoiding the loss of prestress caused by the steel tie rod 1 not being perpendicular to the top plane of the flat box girder. This makes the steel tie rod 1 work more effectively. The first positioning steel plate 6 and the second positioning steel plate 10 are positioned using the coordinates of the four corners, and then fixed by welding the steel frame structure. This ensures the precise positioning of the arch foot bearing plate and the steel tie rod 1, thereby ensuring the precise positioning of the main chord of the arch foot. It avoids deviations in the overall arch axis due to small angular deviations, ensuring the correct construction of the arch bridge line and structural safety. The scaffolding, the first positioning steel plate 6, the second positioning steel plate 10, and the steel frame structure are subsequently directly embedded in the concrete arch abutment foundation and bonded together with the existing ordinary steel bars and concrete, which provides a beneficial anti-pull-out effect for the steel tie rod 1.

[0061] Example 3

[0062] The present invention discloses a method for precise positioning of steel tie rods at the arch foot of steel truss arch bridges, utilizing the device for precise positioning of steel tie rods at the arch foot of steel truss arch bridges as described in Example 1. The method includes the following steps:

[0063] S1. The vertical support rod 2, the horizontal support rod 3 and the diagonal support rod 4 are welded to form the scaffold, and the movable adjustment component 5 is connected to the bottom end of the vertical support rod 2.

[0064] S2. The first positioning steel plate 6, the second positioning steel plate 10, and the steel frame structure are welded together to form a whole. During operation, the first positioning steel plate 6 and the second positioning steel plate 10 are first positioned according to the design coordinates. Then, four horizontal fixing rods 7 are welded to the bottom surface of the first positioning steel plate 6, the top surface and the bottom surface of the second positioning steel plate 10, respectively. The four horizontal fixing rods 7 form a rectangular frame. The four horizontal fixing rods 7 arranged opposite each other are welded together by the vertical fixing rods 8 and the diagonal fixing rods 9 to form the steel frame structure. The steel frame structure is also set at the position of the second positioning steel plate 10 at the bottom and the position where the lower bearing plate 11 is to be set. The four horizontal fixing rods 7 at the bottom of the steel frame structure are used to abut against the lower bearing plate 11. When the lower bearing plate 11 is installed later, it is positioned against the lower bearing plate 11.

[0065] S3. Pass the steel tie rod 1 through the through holes 12 on the first positioning steel plate 6 and the second positioning steel plate 10 in sequence to form a positioning device. At this time, the steel tie rod 1 is a bare steel rod and the nut has not yet been installed.

[0066] S4. The positioning device is transported to the construction site, and the positioning device is adjusted by the scaffolding using the movable adjustment component 5 to accurately locate the coordinates.

[0067] S5. After positioning, the scaffolding is welded to the first positioning steel plate 6 and the second positioning steel plate 10 respectively. Specifically, the first positioning steel plate 6 and the second positioning steel plate 10 are welded to the top of each row of vertical support rods 2. The position of the movable adjustment component 5 is sealed with concrete. At this time, the entire device is fixed and formed into a complete whole, thus completing the precise positioning operation of the steel tie rod 1.

[0068] S6. Install the lower bearing plate 11 and install the fixing end nut of the steel tie rod 1. Before the arch seat concrete is poured, the lower bearing plate 11 can be supported by the vertical support rod 2.

[0069] The method for precise positioning of steel tie rods at the arch foot of a steel truss arch bridge, as described in this embodiment, first uses the positioning device to precisely position the steel tie rod 1, and then installs and connects the upper and lower bearing plates. That is, the upper and lower bearing plates are positioned by the steel tie rod 1, rather than the prior art where the upper and lower bearing plates are positioned first and then the steel tie rod 1 is positioned.

[0070] This embodiment describes a method for precise positioning of steel tie rods at the arch foot of a steel truss arch bridge. The method involves spaced first positioning steel plates 6 and second positioning steel plates 10 along the length of the steel tie rod 1. The through holes 12 on the steel plates cooperate with the steel tie rod 1, allowing the steel plates to limit the position of the steel tie rod 1. This prevents the steel tie rod 1 from deflecting under its own weight or deforming due to the impact of concrete pouring. It ensures that the longer steel tie rod 1 remains perpendicular to the upper and lower bearing plates during construction, thereby guaranteeing that the steel tie rod 1 is perpendicular to the top plane of the flat box. This avoids the loss of prestress caused by the steel tie rod 1 not being perpendicular to the top plane of the flat box, making the steel tie rod 1 work more effectively.

[0071] This embodiment describes a method for precise positioning of steel tie rods at the arch foot of a steel truss arch bridge. The method uses the coordinates of the four corners to position the first positioning steel plate 6 and the second positioning steel plate 10, and then secures them by welding the steel frame structure. This ensures precise angular positioning of the arch foot bearing plate and the steel tie rod 1, thereby ensuring precise angular positioning of the main chord of the arch foot. It avoids deviations in the overall arch axis caused by small angular deviations, ensuring correct construction of the arch bridge's alignment and structural safety.

[0072] This embodiment describes a method for precise positioning of steel tie rods at the arch foot of a steel truss arch bridge. The scaffolding, the first positioning steel plate 6, the second positioning steel plate 10, and the steel frame structure are subsequently directly embedded in the concrete arch foundation and bonded together with the existing ordinary steel bars and concrete, which provides a beneficial effect against pull-out of the steel tie rod 1.

[0073] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for precise positioning of steel tie rods at the arch foot of a steel truss arch bridge, characterized in that, The system includes a rectangular first positioning steel plate (6) and several rectangular second positioning steel plates (10). The length of the steel tie rod (1) in the concrete arch foundation is L, which is divided into n segments. The first positioning steel plate (6) is set at the starting node, and the second positioning steel plate (10) is set at each intermediate node. The lower bearing plate (11) is set at the ending node. Several through holes (12) are respectively provided on the first positioning steel plate (6) and the second positioning steel plate (10). The through holes (12) are used for the steel tie rod (1) to pass through. The positions of the first positioning steel plate (6) and the second positioning steel plate (10) are fixed by the coordinates of the four corners. A steel frame structure is provided between the first positioning steel plate (6) and the second positioning steel plate (10), between adjacent second positioning steel plates (10), and between the second positioning steel plate (10) and the lower bearing plate (11). The steel frame structure is welded to the corresponding first positioning steel plate (6) and second positioning steel plate (10). The lowest steel frame structure is used to abut against the lower bearing plate (11).

2. The device for precise positioning of steel tie rods at the arch foot of a steel truss arch bridge according to claim 1, characterized in that, L is evenly divided into n segments.

3. The device for precise positioning of steel tie rods at the arch foot of a steel truss arch bridge according to claim 1, characterized in that, The steel frame structure includes a horizontal fixing rod (7), a vertical fixing rod (8), and an oblique fixing rod (9). The horizontal fixing rod (7) and the vertical fixing rod (8) are welded into a cubic frame, and the oblique fixing rod (9) is welded to the side of the cubic frame.

4. The device for precise positioning of steel tie rods at the arch foot of a steel truss arch bridge according to claim 3, characterized in that, A pair of X-shaped oblique fixing rods (9) are welded to the side of the cube frame.

5. The device for precise positioning of steel tie rods at the arch foot of a steel truss arch bridge according to claim 1, characterized in that, The first positioning steel plate (6) and the second positioning steel plate (10) are provided with a row of through holes (12) on the top, bottom and left and right sides respectively.

6. The device for precise positioning of steel tie rods at the arch foot of a steel truss arch bridge according to claim 1, characterized in that, The diameter of the through hole (12) is 1mm-2mm larger than the diameter of the steel tie rod (1).

7. The device for precise positioning of steel tie rods at the arch foot of a steel truss arch bridge according to any one of claims 1-6, characterized in that, The first positioning steel plate (6) and the second positioning steel plate (10) are connected to the scaffold. The bottom of the scaffold is provided with a movable adjustment component (5), which is used for the horizontal movement and vertical lifting of the scaffold.

8. The device for precise positioning of steel tie rods at the arch foot of a steel truss arch bridge according to claim 7, characterized in that, The scaffolding includes vertical support rods (2), horizontal support rods (3), and diagonal support rods (4). The vertical support rods (2) are arranged in a corresponding number of rows according to the number of the first positioning steel plate (6) and the second positioning steel plate (10). Each row includes several vertical support rods (2). The top of the vertical support rods (2) is connected to the corresponding first positioning steel plate (6) or second positioning steel plate (10). The vertical support rods (2) are connected to each other by several horizontal support rods (3) and several diagonal support rods (4). The movable adjustment component (5) is provided at the bottom of the vertical support rods (2).

9. A steel truss arch bridge, characterized in that, Includes an arch base, wherein the arch base is embedded with a device for precise positioning of steel tie rods at the arch foot of a steel truss arch bridge as described in any one of claims 7-8, and the reinforcing bars in the arch base are connected to the first positioning steel plate (6), the second positioning steel plate (10), the steel frame structure and / or the scaffolding.

10. A method for precise positioning of steel tie rods at the arch foot of a steel truss arch bridge, characterized in that, Using the device for precise positioning of steel tie rods at the arch foot of a steel truss arch bridge as described in any one of claims 7-8, the method includes the following steps: S1. The first positioning steel plate (6), the second positioning steel plate (10) and the steel frame structure are welded together to form a whole; S2. Pass the steel tie rod (1) through the through hole (12) on the first positioning steel plate (6) and the second positioning steel plate (10) in sequence to form a positioning device; S3. The positioning device is transported to the construction site, and the positioning device is adjusted by the scaffolding using the movable adjustment component (5) to accurately position the coordinates. S4. After positioning, the scaffold is welded to the first positioning steel plate (6) and the second positioning steel plate (10) respectively, and the position of the movable adjustment component (5) is sealed with concrete to solidify and shape it.

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