A method for positioning and installing stiffening chord node plates on steel trusses

Abstract

This invention discloses a method for positioning and installing a stiffening chord node plate on a steel truss girder. A cross-shaped positioning member, with first and second prisms at both ends of the longitudinal members and third and fourth prisms at both ends of the transverse members, is placed on the bridge deck at the installation position of the stiffening chord node plate. The center of the cross-shaped positioning member is aligned with the installation center of the stiffening chord node plate, and the longitudinal and transverse members face the longitudinal and transverse directions of the bridge, respectively. Using a total station in conjunction with the cross-shaped positioning member, the longitudinal and transverse slope calculation parameters at the installation position of the stiffening chord node plate are measured. Based on these parameters, the longitudinal and transverse slopes at the installation position of the stiffening chord node plate are calculated. Based on these longitudinal and transverse slopes, a slope is cut at the bottom of the stiffening chord node plate. The purpose of this invention is to improve the installation accuracy of the stiffening chord node plate.

Description

Technical Field

[0001] This invention belongs to the field of steel truss construction, specifically relating to a method for positioning and installing stiffening chord node plates on steel trusses. Background Technology

[0002] Currently, long-span steel truss bridges have become one of the most competitive bridge types for the future, and several have been built in the past few decades. However, maintenance and inspection data show that cracking of the gusset plates frequently occurs in the stiffening chords of these bridges. In recent years, the increasing demand for national traffic, coupled with repeated minor torsion caused by vehicles and other forces, can also lead to cracks at the weld joints of the stiffening chord gusset plates.

[0003] Traditionally, inaccurate slope measurements at the installation position of the stiffening chord node plate have led to deviations between the processed stiffening chord node plate and the design. The vertical poles, which are tens of meters long, directly reflect these errors in the installation of the stiffening chord, causing inaccurate alignment and requiring rework of the node plate installation. In addition, imprecise cutting of the slope of the stiffening chord node plate can result in 1-3cm gaps in localized areas of the bridge deck, significantly affecting welding quality and causing cracks at the weld joints later on, further shortening the service life of the bridge. Summary of the Invention

[0004] To address the problems existing in the prior art, this invention provides a method for positioning and installing the upper stiffening chord node plate of a steel truss, aiming to improve the installation accuracy of the upper stiffening chord node plate, ensure the construction quality of the steel truss bridge, and increase its service life.

[0005] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution:

[0006] A method for positioning and installing stiffening chord node plates on a steel truss girder, comprising:

[0007] Place the cross-shaped positioning member with the first and second prisms at both ends of the longitudinal member and the third and fourth prisms at both ends of the transverse member at the installation position of the upper stiffening chord node plate on the bridge deck, so that the cross center of the cross-shaped positioning member is aligned with the installation center of the upper stiffening chord node plate, and the longitudinal member and transverse member are oriented towards the longitudinal direction and the transverse direction of the bridge, respectively.

[0008] Using a total station and a cross-shaped positioning rod, the longitudinal and transverse slope calculation parameters at the installation position of the upper stiffening chord node plate are measured. Based on the longitudinal and transverse slope calculation parameters, the longitudinal and transverse slopes at the installation position of the upper stiffening chord node plate are calculated respectively.

[0009] Based on the longitudinal and transverse slopes at the installation location of the upper stiffening chord node plate, cut the slope at the bottom of the upper stiffening chord node plate and install the cut upper stiffening chord node plate at the installation location.

[0010] Furthermore, the longitudinal slope calculation parameters at the installation position of the upper stiffening chord node plate include: the angle α formed by the first prism and the second prism with the center point of the total station in the XOZ plane. Y1 and α Y2 And the angle β formed by the first and second prisms with the center point of the total station in the YOZ plane. Y1 and β Y2 And the horizontal and vertical distances M from the first and second prisms to the center point of the total station, respectively. Y1 and M Y2 ;

[0011] The formula for calculating the longitudinal slope of the bridge at the installation location of the upper stiffening gusset plate is as follows:

[0012] arctan(H Y1 -H Y2 =arctan(M) Y1 *tan(α Y1 ) / tan(β Y1 )- M Y2 *tan(α Y2 )*arctan(β Y2 ))

[0013] H Y1 =M Y1 *tan(α Y1 ) / tan(β Y1 )

[0014] H Y2 =M Y2 *tan(α Y2 )*arctan(β Y2 )

[0015] In the formula, arctan(H) Y1 -H Y2 H represents the longitudinal slope of the bridge at the installation location of the upper stiffening chord node plate. Y1 H represents the elevation value of the first prism. Y2 This indicates the elevation value of the second prism.

[0016] Furthermore, the calculation parameters for the transverse slope of the bridge at the installation location of the upper stiffening chord node plate include: the angle α formed by the third and fourth prisms and the center point of the total station in the XOZ plane. X1 and α X2And the angles β formed by the third and fourth prisms with the center point of the total station in the YOZ plane. X1 and β X2 And the horizontal and vertical distances M from the third and fourth prisms to the center point of the total station, respectively. X1 and M X2 ;

[0017] The formula for calculating the transverse slope at the installation location of the upper stiffening gusset plate is as follows:

[0018] arctan(H X1 -H X2 = arctan(M) X1 *tan(α X1 ) / tan(β X1 )- M X2 *tan(α X2 )*arctan(β X2 ))

[0019] H X1 =M X1 *tan(α X1 ) / tan(β X1 )

[0020] H X2 =M X2 *tan(α X2 )*arctan(β X2 )

[0021] In the formula, arctan(H) X1 -H X2 H represents the transverse slope of the bridge at the installation location of the upper stiffening chord node plate. X1 H represents the elevation value of the third prism. X2 This indicates the elevation value of the fourth prism.

[0022] Further, the step of installing the cut upper stiffening chord node plate at the upper stiffening chord node plate mounting position includes:

[0023] A displacement device is used to move the cut upper stiffening chord node plate to make it coincide with the installation position line.

[0024] Furthermore, the displacement device includes a T-shaped rod, and the sides of the longitudinal rod and the sides of the transverse rod located on both sides of the longitudinal rod are provided with sliding grooves. Each sliding groove is slidably provided with a telescopic drive device whose telescopic direction is perpendicular to the corresponding rod.

[0025] The method of using a displacement device to move the position of the cut upper stiffening chord node plate is as follows:

[0026] The displacement device is placed at both ends of the cut upper stiffening chord node plate, so that the T-shaped member at each end is fixed on the bridge deck and the longitudinal member extends into the cut upper stiffening chord node plate.

[0027] By adjusting the position of the telescopic drive device in the two grooves on the side of the crossbar, the two telescopic drive devices are aligned with the outer node plate end face and the inner node plate end face of the cut upper stiffening chord node plate, respectively. The telescopic drive devices in the two grooves on the side of the crossbar are controlled to push the cut upper stiffening chord node plate, so that the cut upper stiffening chord node plate coincides with the installation position line along the transverse bridge direction.

[0028] By adjusting the position of the telescopic drive devices in the sliding grooves on both sides of the longitudinal bar, the two telescopic drive devices are aligned with the outer end face and inner end face of the cut upper stiffening chord node plate, respectively. The telescopic drive devices in the sliding grooves on both sides of the longitudinal bar are controlled to push the cut upper stiffening chord node plate, so that the cut upper stiffening chord node plate coincides with the installation position line along the longitudinal direction of the bridge.

[0029] Furthermore, each slide is detachably provided with a limit pin, which is used to limit the telescopic drive device.

[0030] Furthermore, before placing the cross-shaped positioning member at the installation position of the upper stiffening chord node plate on the bridge deck, the following steps are also included:

[0031] Mark the installation center control point of the stiffening chord node plate on the bridge deck.

[0032] Furthermore, before placing the cross-shaped positioning member at the installation position of the upper stiffening chord node plate on the bridge deck, the following steps are also included:

[0033] Rust removal treatment is performed within the specified range of the stiffening chord node plate installation location.

[0034] Furthermore, the cut upper stiffening chord node plate is welded to the upper stiffening chord node plate installation position using a welding method.

[0035] Furthermore, during welding, the large bevel side weld of the upper stiffening chord node plate is welded first, and then the small bevel side of the upper stiffening chord node plate is cleaned by air gouging. After the cleaning is completed, the small bevel side weld of the upper stiffening chord node plate is welded.

[0036] Compared with the prior art, the present invention has at least the following beneficial effects:

[0037] This invention provides a method for positioning and installing upper stiffening chord node plates on steel trusses. Utilizing a total station in conjunction with a cross-shaped positioning rod and a prism mounted on it, the longitudinal and transverse slope calculation parameters at the installation location of the upper stiffening chord node plate can be accurately measured. Based on these parameters, the longitudinal and transverse slopes at the installation location of the upper stiffening chord node plate can be calculated. This ensures the accuracy of the cutting slope of the upper stiffening chord node plate and the accuracy of its installation inclination slope, guaranteeing zero installation error, increasing the success rate of the first-time installation of the upper stiffening chord, improving installation accuracy and construction efficiency, ensuring the construction quality of the steel truss bridge, and extending its service life.

[0038] Furthermore, the present invention employs a displacement device to push the cut upper stiffening chord node plate to its position, which can automatically push the upper stiffening chord node plate to the installation position without the need for crane hoisting or a large amount of manpower assistance, thus saving a lot of manpower and material resources and improving construction efficiency.

[0039] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the specific embodiments of the present invention, the drawings used in the description of the specific embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0041] Figure 1 This is a schematic diagram of the total station measuring prism in a method for positioning and installing stiffening chord node plates on a steel truss according to an embodiment of the present invention;

[0042] Figure 2 This is a schematic diagram of the displacement device pushing the node plate in a method for positioning and installing stiffening chord node plates on a steel truss beam according to an embodiment of the present invention;

[0043] Figure 3 This is a schematic diagram of the displacement device in a method for positioning and installing stiffening chord node plates on a steel truss beam according to an embodiment of the present invention;

[0044] Figure 4 This is a schematic diagram of the bevel joint of the node plate.

[0045] In the figure: 1-cross-shaped positioning rod; 2-total station; 3-shifting device; 30-T-shaped rod; 31-slide groove; 32-telescopic drive device; 33-limiting pin; 4-upper stiffening chord node plate; 40-outer node plate; 41-inner node plate. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0047] like Figure 1 As shown in the figure, an embodiment of the present invention provides a method for positioning and installing stiffening chord node plates on steel trusses, which specifically includes the following steps:

[0048] Step 1: Place the cross-shaped positioning rod 1, which has a first prism Y1 and a second prism Y2 at both ends of the longitudinal rod and a third prism X1 and a fourth prism X2 at both ends of the transverse rod, on the upper stiffening chord node plate installation position on the bridge deck, so that the cross center of the cross-shaped positioning rod 1 is aligned with the installation center of the upper stiffening chord node plate, and the longitudinal rod and the transverse rod are oriented towards the longitudinal bridge direction and the transverse bridge direction, respectively.

[0049] It should be understood that the upper stiffening chord node plate 4 has both longitudinal and transverse bridge slopes. Its precision directly reflects the installation of the upper stiffening chord through the vertical members, determining whether the upper stiffening chord can be precisely aligned and installed with the vertical members. The upper stiffening chord node plate 4 consists of two node plates: an outer node plate 40 end face and an inner node plate 41. The upper part of the upper stiffening chord node plate has high-strength bolt holes for connecting the vertical members. Combined with... Figure 4 As shown, a single node plate is divided into two sides: the large bevel side and the small bevel side.

[0050] Preferably, before placing the cross-shaped positioning member 1 at the installation position of the upper stiffening chord node plate on the bridge deck, the following operations are performed:

[0051] a. Mark the center control point for the stiffening chord node plate installation on the bridge deck according to the design drawings;

[0052] b. Based on the installation center control point of the upper stiffening chord node plate, measure the installation position lines of the outer node plate 40 end face and the inner node plate 41. Then, use a rust removal machine to remove the surface material of the steel bridge deck within a 10cm range on both sides of the installation position lines. The rust removal machine is used to remove rust, metal particles, dust, oil stains, plating, and coatings from the surface of the steel bridge deck at the welding position of the upper stiffening chord node plate to ensure the welding quality of the upper stiffening chord node plate.

[0053] In this embodiment, the cross-shaped positioning rod 1 is made of cross-shaped steel bar, and the distance between the first prism Y1 and the second prism Y2 in the longitudinal direction and the third prism X1 and the fourth prism X2 in the transverse direction is 1m.

[0054] Step 2: Using the total station 2 and the cross-shaped positioning rod 1, measure the longitudinal and transverse slope calculation parameters at the installation position of the upper stiffening chord node plate. Calculate the longitudinal and transverse slopes at the installation position of the upper stiffening chord node plate based on the longitudinal and transverse slope calculation parameters.

[0055] It should be noted that the total station 2 is used in conjunction with a tripod and a level bubble. The tripod is used to support the total station 2, and the level bubble is used to level the total station 2 so that it is in a horizontal plane.

[0056] Specifically, the longitudinal slope calculation parameters at the installation location of the upper stiffening chord node plate include: the angle α formed by the first prism Y1 and the second prism Y2 with the center point of the total station 2 in the XOZ plane. Y1 and α Y2 And the angle β formed by the first prism Y1 and the second prism Y2 with the center point of the total station 2 in the YOZ plane. Y1 and β Y2 And the horizontal and vertical distances M from the first prism Y1 and the second prism Y2 to the center point of the total station 2, respectively. Y1 and M Y2 The formula for calculating the longitudinal slope of the bridge at the installation location of the upper stiffening chord node plate is as follows:

[0057] arctan(H Y1 -H Y2 =arctan(M) Y1 *tan(α Y1 ) / tan(β Y1 )- M Y2 *tan(α Y2 )*arctan(β Y2 ))

[0058] H Y1 =M Y1 *tan(α Y1 ) / tan(β Y1 )

[0059] H Y2 =M Y2 *tan(α Y2 )*arctan(β Y2 )

[0060] In the formula, arctan(H) Y1 -H Y2 H represents the longitudinal slope of the bridge at the installation location of the upper stiffening chord node plate. Y1 H represents the elevation value of the first prism Y1. Y2 This represents the elevation value of the second prism Y2.

[0061] The calculation parameters for the transverse slope of the bridge at the installation location of the upper stiffening chord node plate include: the angles α formed by the third prism X1 and the fourth prism X2 with the center point of the total station 2 in the XOZ plane. X1 and α X2 And the angles β formed by the third prism X1 and the fourth prism X2 with the center point of the total station 2 in the YOZ plane. X1 and β X2 And the horizontal and vertical distances M from the third prism X1 and the fourth prism X2 to the center point of the total station 2, respectively. X1 and M X2 The formula for calculating the transverse slope at the installation location of the upper stiffening chord node plate is as follows:

[0062] arctan(H X1 -H X2 = arctan(M) X1 *tan(α X1 ) / tan(β X1 )- M X2 *tan(α X2 )*arctan(β X2 ))

[0063] H X1 =M X1 *tan(α X1 ) / tan(β X1 )

[0064] H X2 =M X2 *tan(α X2 )*arctan(β X2 )

[0065] In the formula, arctan(H) X1 -H X2 H represents the transverse slope of the bridge at the installation location of the upper stiffening chord node plate. X1 H represents the elevation value of the third prism X1. X2 This represents the elevation value of the fourth prism X2.

[0066] It should be noted that the XOZ plane refers to the vertical plane perpendicular to the longitudinal direction of the bridge, while the YOZ plane refers to the vertical plane perpendicular to the transverse direction of the bridge.

[0067] Step 3: Based on the longitudinal and transverse slopes at the installation location of the upper stiffening chord node plate, cut a slope at the bottom of the upper stiffening chord node plate to match the longitudinal and transverse slopes at the installation location. Then, install the cut upper stiffening chord node plate at the installation location.

[0068] It should be understood that after the slope cutting is completed, it is also necessary to cut large and small bevels on the end face of the outer node plate 40 and the inner node plate 41.

[0069] As a more preferred embodiment, combined with Figure 2 and Figure 3 As shown, the position of the cut upper stiffening chord node plate is moved by the displacement device 3 so that the cut upper stiffening chord node plate coincides with the installation position line. Specifically, the displacement device 3 includes a T-shaped member 30. The sides of the longitudinal members of the T-shaped member 30 and the sides of the transverse members located on both sides of the longitudinal members are provided with grooves 31. Each groove 31 is slidably provided with a telescopic drive device 32 whose telescopic direction is perpendicular to the corresponding member.

[0070] For example, the telescopic drive device 32 is a jack.

[0071] It should be understood that the use of the shifting device 3 to move the position of the cut upper stiffening chord node plate is for fine-tuning. Before fine-tuning, the upper stiffening chord node plate has been hoisted and placed on the steel bridge deck within the rust-removed area using a lifting device.

[0072] like Figure 3 As shown, in this embodiment, displacement devices 3 are placed at both ends of the cut upper stiffening chord node plate, so that the T-shaped members 30 at each end are fixed on the bridge deck and the longitudinal members extend into the cut upper stiffening chord node plate. That is, the position of the cut upper stiffening chord node plate is adjusted by using two displacement devices 3 in cooperation, as follows:

[0073] By adjusting the positions of the telescopic drive devices 32 within the two grooves 31 on the side of the crossbar, the two telescopic drive devices 32 are aligned with the end faces of the outer node plate 40 and the inner node plate 41 of the cut upper stiffening chord node plate, respectively. This controls the telescopic drive devices 32 within the two grooves 31 on the side of the crossbar to push the cut upper stiffening chord node plate, aligning it with the installation position line along the transverse direction of the bridge. In other words, the longitudinal position of the upper stiffening chord node plate can be adjusted using the telescopic drive devices 32 on the side of the crossbar. Specifically, based on the actual position of the upper stiffening chord node plate, the telescopic drive devices 32 move along the grooves 31 until they abut against the end faces of the outer node plate 40 and the inner node plate 41 of the upper stiffening chord node plate. Then, the extension amount of the telescopic drive devices 32 is controlled to adjust the position of the upper stiffening chord node plate.

[0074] By adjusting the position of the telescopic drive device 32 in the slide groove 31 on both sides of the longitudinal bar, the two telescopic drive devices 32 are aligned with the end face of the outer node plate 40 and the end face of the inner node plate 41 of the cut upper stiffening chord node plate, respectively. The telescopic drive devices 32 in the slide groove 31 on both sides of the longitudinal bar are controlled to push the cut upper stiffening chord node plate, so that the cut upper stiffening chord node plate coincides with the installation position line along the longitudinal bridge direction. That is, the position of the upper stiffening chord node plate in the transverse bridge direction can be adjusted by using the telescopic drive devices 32 on both sides of the longitudinal bar.

[0075] In this embodiment, the position of the upper stiffening chord node plate after cutting is moved by the displacement device 3 for fine adjustment, which saves the number of repeated hoisting and manual displacement, thus saving manpower and material resources.

[0076] Regarding the fixing method between the T-shaped member 30 and the bridge deck, for example, the T-shaped member 30 adopts a T-shaped steel frame. After the T-shaped steel frame is placed between the inner and outer node plates on the steel bridge deck, six steel plates are vertically welded to the steel bridge deck to fix the T-shaped steel frame, restricting the movement of the T-shaped steel frame in order to provide a reaction force.

[0077] Regarding the sliding structure of the telescopic drive device 32 within the slide groove 31, for example, a slider is slidably matched within the slide groove 31, and the slider is fixedly connected to the corresponding telescopic drive device 32.

[0078] Preferably, a limit pin 33 is detachably provided in each slide 31, and the limit pin 33 is used to limit the telescopic drive device 32. That is, when the telescopic drive device 32 moves to a suitable position, the limit pin 33 is used to temporarily limit the telescopic drive device 32 to prevent the telescopic drive device 32 from moving.

[0079] In one embodiment, the cut upper stiffening chord node plate is welded to the installation position of the upper stiffening chord node plate by welding. Specifically, the welding machine uses a current of 260-320A, a voltage of 32-34V, and a gas flow rate of 15-25L / min. The welding process uses solid wire CO2 gas shielded welding. First, the weld seam on the large bevel side of the upper stiffening chord node plate is welded. Then, the small bevel side of the upper stiffening chord node plate is gouged to remove the root. After the root removal is completed, the weld seam on the small bevel side of the upper stiffening chord node plate is welded. Finally, the appearance is inspected and ground for flaw detection and ultrasonic flaw detection. If any problems are found, they should be removed and re-welded.

[0080] For example, welding the large bevel side weld means welding 23 times on the large bevel side weld, and welding the small bevel side weld means welding 10 times on the small bevel side weld.

[0081] This embodiment strictly controls the welding quality of the upper stiffening chord node plate to avoid weld cracking, ensuring construction quality and extending its service life. This invention enables precise alignment of the upper stiffening chord node plate, eliminates installation errors, improves installation accuracy, saves manpower and resources, and increases construction efficiency.

[0082] In the description of this invention, it should be understood that the terms "upper", "lower", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0083] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0084] In this invention, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0085] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0086] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0087] Finally, it should be noted that the above-described embodiments are merely specific implementations of the present invention, used to illustrate the technical solutions of the present invention, and not to limit it. The scope of protection of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments within the technical scope disclosed in the present invention, or make equivalent substitutions for some of the technical features; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method of positioning and installing a chord node plate on a steel truss, characterized by, include: The cross-shaped positioning member (1), which has a first prism (Y1) and a second prism (Y2) at both ends of the longitudinal member and a third prism (X1) and a fourth prism (X2) at both ends of the transverse member, is placed on the upper stiffening chord node plate installation position on the bridge deck, so that the cross center of the cross-shaped positioning member (1) is aligned with the installation center of the upper stiffening chord node plate, and the longitudinal member and the transverse member are respectively oriented towards the longitudinal bridge direction and the transverse bridge direction; Using a total station (2) and a cross-shaped positioning rod (1), the longitudinal and transverse slope calculation parameters at the installation position of the upper stiffening chord node plate are measured. Based on the longitudinal and transverse slope calculation parameters, the longitudinal and transverse slopes at the installation position of the upper stiffening chord node plate are calculated respectively. According to the longitudinal and transverse slopes at the installation position of the upper stiffening chord node plate, the slope is cut at the bottom of the upper stiffening chord node plate, and the position of the cut upper stiffening chord node plate is pushed by the displacement device (3) so that the cut upper stiffening chord node plate coincides with the installation position line; the displacement device (3) includes a T-shaped rod (30), and the sides of the longitudinal rod and the sides of the transverse rod located on both sides of the longitudinal rod of the T-shaped rod (30) are provided with grooves (31), and each groove (31) is slidably provided with a telescopic drive device (32) whose telescopic direction is perpendicular to the corresponding rod. The method of using a shifting device (3) to shift the position of the cut upper stiffening chord node plate is as follows: The displacement device (3) is placed at both ends of the cut upper stiffening chord node plate, so that the T-shaped rod (30) at each end is fixed on the bridge deck and the longitudinal rod extends into the cut upper stiffening chord node plate; By adjusting the position of the telescopic drive device (32) in the two slide grooves (31) on the side of the crossbar, the two telescopic drive devices (32) are aligned with the end face of the outer node plate (40) and the end face of the inner node plate (41) of the cut upper stiffening chord node plate, respectively. The telescopic drive device (32) in the two slide grooves (31) on the side of the crossbar is controlled to push the cut upper stiffening chord node plate, so that the cut upper stiffening chord node plate coincides with the installation position line along the transverse bridge direction. By adjusting the position of the telescopic drive device (32) in the slide groove (31) on both sides of the longitudinal bar, the two telescopic drive devices (32) are aligned with the end face of the outer node plate (40) and the end face of the inner node plate (41) of the cut upper stiffening chord node plate, respectively. The telescopic drive device (32) in the slide groove (31) on both sides of the longitudinal bar is controlled to push the cut upper stiffening chord node plate, so that the cut upper stiffening chord node plate coincides with the installation position line along the longitudinal bridge direction.

2. The method for positioning and installing stiffening chord node plates on a steel truss girder according to claim 1, characterized in that, Each slide (31) is detachably provided with a limiting pin (33), which is used to limit the telescopic drive device (32).

3. The method for positioning and installing stiffening chord node plates on steel truss beams according to claim 1, characterized in that, Before placing the cross-shaped positioning member (1) at the installation position of the upper stiffening chord node plate on the bridge deck, the following is also included: Mark the installation center control point of the stiffening chord node plate on the bridge deck.

4. The method for positioning and installing stiffening chord node plates on steel truss beams according to claim 1, characterized in that, Before placing the cross-shaped positioning member (1) at the installation position of the upper stiffening chord node plate on the bridge deck, the following is also included: Rust removal treatment is performed within the set range of the installation position of the upper stiffening chord node plate.

5. The method for positioning and installing stiffening chord node plates on steel truss beams according to claim 1, characterized in that, The cut upper stiffening chord node plate is welded to the upper stiffening chord node plate installation position by welding.

6. The method for positioning and installing stiffening chord node plates on a steel truss beam according to claim 5, characterized in that, During welding, first weld the large bevel side weld of the upper stiffening chord node plate, then perform air gouging to clean the root of the small bevel side of the upper stiffening chord node plate, and finally weld the small bevel side weld of the upper stiffening chord node plate.

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