Installation method of landscape bridge with steel arch and steel frame space structure system

Abstract

A method for installing a landscape bridge with a steel arch and steel frame spatial structure system relates to the field of bridge construction. The method for installing a landscape bridge with a steel arch and steel frame spatial structure system is to establish a three-dimensional model based on the steel main beam; divide the segments of the hoisting components of the landscape bridge with the steel arch and steel frame spatial structure system into segments, set the hoisting points, and perform numbering based on the three-dimensional model; establish an overall coordinate system on site according to the three-dimensional model, draw the longitudinal baseline of the inner hanger, the longitudinal baseline of the steel frame, and the longitudinal baseline of the outer hanger along the longitudinal direction of the bridge, draw the transverse baseline of the hanger node along the transverse direction of the bridge, and set up a bracket to install the landscape bridge with the steel arch and steel frame spatial structure system. After installing the inner and outer hangers, tension and lift them simultaneously until the bridge completes force balance, and then remove the steel arch assembly bracket. The method for installing a landscape bridge with a steel arch and steel frame spatial structure system facilitates the extraction of theoretical data of control nodes for bridge construction for measurement and positioning by establishing a three-dimensional model, thereby improving the accuracy of component segment positioning and reducing construction difficulty.

Description

Technical Field

[0001] The present application relates to the field of bridge construction, and in particular to a method for installing a landscape bridge with a steel arch and steel frame spatial structure system. Background Art

[0002] The steel arch and steel frame spatial structure system of the landscape bridge primarily comprises a steel deck, steel arch, steel frame, steel cross-ties, and hangers. The steel arch is the bridge's primary load-bearing structure, primarily consisting of a single-chamber arch box extending from the deck end crossbeam area to three independent spatial arch ribs. The arch ribs are connected by connecting rods, and internal hangers are installed between the lower arch rib and the steel deck. To balance the transverse instability of the single arch, two rows of steel frames are installed along the longitudinal direction of the arch. Rigid cross-ties are used to reinforce the steel frames and arches. The arch sides are hinged, and the frame sides are welded. Because the steel frame cannot withstand large transverse bending moments, external steel cross-ties are installed on the outside of the steel frame. External hangers are installed below the external cross-ties to balance the bending moments transmitted to the frame by the inner cross-ties, leaving it to bear only compressive forces. The steel arch and steel frame spatial structure system connects and transmits loads between the various structures, creating a complex load-bearing system.

[0003] The current conventional steel arch bridge construction method cannot solve the construction difficulties of landscape steel bridges with steel arch and steel frame spatial structure systems. The difficulties mainly lie in the following three aspects:

[0004] 1. The theoretical positioning accuracy of the steel arch and steel frame spatial structure is extremely high. The steel arch radiates from the whole into three arch ribs, including the spatial alignment of the longitudinal bridge elevation and the plane fit. The steel frame crossbeam is designed with the vertical alignment of the longitudinal bridge to achieve the landscape effect. As a result, the steel cross-connection between the steel arch and the steel frame is hinged on one side to the outward-extending ear plate of the spatial arch rib, and fixed on the other side to the side wall of the steel frame crossbeam with the longitudinal bridge elevation. The hinged connection adopts a pin connection, requiring a machining tolerance of ±0.5mm. How to achieve the 0.5mm level of jointing in the complex spatial system of the bridge steel structure project with a length of hundreds of meters is a major difficulty in the construction process.

[0005] Second, the steel arch and steel frame spatial structure system is often divided into segments with spatially irregular shapes, which makes on-site construction difficult. Except for the arch foot segments, most steel arches are spatially irregular structures, which restrict each other in terms of working space. Their transportation and lifting lug arrangements are different from those of standard steel arch segments.

[0006] 3. The steel arch and steel frame spatial structural system is subject to complex forces, and the various structural components interact and restrict each other during installation. Since the steel structure will deform under the influence of gravity after installation, a steel arch with a span of 100 meters will generally deflect 100mm-200mm overall. Furthermore, after the steel frame is installed, it will also deform under the influence of its own weight. When the structure is affected by its own weight, the actual installation space for the steel cross-connections will differ significantly from the theoretical length, greatly increasing the construction difficulty. Summary of the Invention

[0007] The purpose of this application is to provide an installation method for a landscape bridge with a steel arch and steel frame spatial structure system, which can facilitate the extraction of theoretical data of control nodes for bridge construction for measurement and positioning by establishing a three-dimensional model, thereby improving the positioning accuracy of bridge construction and reducing construction difficulty.

[0008] The embodiment of the present application is implemented as follows:

[0009] The embodiment of the present application provides an installation method for a steel arch steel frame space structure system landscape bridge, the steel arch steel frame space structure system landscape bridge includes a steel main beam, a steel arch, two steel frames respectively arranged on both sides of the steel arch and a plurality of steel cross-links, the bottom of the steel frame is connected to the steel main beam, the steel arch includes a lower arch, two upper arches respectively arranged on both sides above the lower arch, a plurality of oblique links respectively connected to the lower arch and the upper arch, a plurality of flat links respectively connected to the two upper arches and two arch box sections, the two ends of the lower arch and the two upper arches are respectively connected to the two arch box sections, the two arch box sections are respectively connected to the steel main beam, a plurality of inner hangers are connected between the lower arch and the steel main beam, each upper arch is connected to a plurality of steel cross-links, each steel cross-link is connected to the steel frame, and each steel cross-link is respectively connected to the side of the steel main beam through an outer hanger, the installation method of the steel arch steel frame space structure system landscape bridge includes the following steps:

[0010] A three-dimensional model of the landscape bridge structure with a steel arch and steel frame spatial structure system is established based on the steel main beam;

[0011] Based on the established 3D model, the hoisting component segments of the steel arch and steel frame spatial structure system landscape bridge are divided, and the hoisting point settings and numbering of the hoisting component segments are completed;

[0012] An overall coordinate system was established on site based on the three-dimensional model. The inner hanger longitudinal baseline, steel frame longitudinal baseline, and outer hanger longitudinal baseline were drawn along the longitudinal direction of the bridge. The hanger node transverse baseline was drawn along the transverse direction of the bridge. Brackets were set up to install the steel arch and steel frame space structure system landscape bridge. After the inner and outer hangers were installed, they were tensioned and lifted simultaneously until the entire steel arch and steel frame space structure system landscape bridge system achieved force balance, and then the steel arch assembly brackets were removed.

[0013] In some optional implementation schemes, establishing a three-dimensional model of a landscape bridge structure of a steel arch and steel frame spatial structure system based on the steel main beam includes the following steps:

[0014] Establish the structural system benchmark; take the intersection of the theoretical guide line of the arch box section and the center line of the support as the benchmark origin O(0,0,0), and establish the overall coordinate system with the longitudinal bridge direction as the X axis, the transverse bridge direction as the Y axis, and the vertical surface as the Z axis;

[0015] Establish the theoretical guide line of the steel arch, with the vertex of the vertical projection of the guide line of the upper arch as the origin, the direction of the arch foot of the upper arch as the positive X direction, and the downward direction of the plumb bob as the positive Y direction. Take the bridge deck as the reference and model the steel arch system from the bridge deck to perform the coordinate system transformation. The design coordinate system is (X, Y), and the new coordinate system is (X1, Z1), X = -(X1+D1 / 2-D2), Y = -(Z1+D3), D1 is the longitudinal length of the steel main beam, D2 is the distance between the center line of the arch box section support and the corresponding end face of the steel main beam, and D3 is the distance between the steel main beam and the upper arch guide line; establish the vertical line type of the steel arch, and divide the steel arch into the arch box section with a standard circular curve vertical surface (Xo<X<Xa, Xa'<X<Xo') and the arch rib section with a parabola vertical surface (Xa<X<Xa') according to the structural form. The parabolic equation of the upper arch GL1 and GL2 is Y=4f1 / (L1 2 )X 2 The parabola equation of the lower arch GL3 is Y=4f2 / (L2 2 )X 2 +c, where f, L, and c are constants. The modeling line type according to the coordinate transformation is: Upper arch facade equation: Z1 = -4f1 / (L1 2 )(X1+D1 / 2-D2) 2 -D3(Xa<X1<Xa'), the equation of the lower arch facade: Z1=-4f2 / (L2 2 )X1 2 +c-D3(Xa<X1<Xa'); establish the spatial line type of the steel arch, with the plane projection of the guide line of the arch box section as a straight line, the plane projection of the arch guide line of the upper arches GL1 and GL2 as a circular arc line, the center line plane of the lower arch as a straight line, and the plane curves of the upper arches GL1 and GL2 arranged symmetrically with respect to the lower arch GL3. First, draw the vertical line type of the steel arch after adding pre-camber in the XZ plane, and then draw the plane arc line type of the arch guide line of the upper arches GL1 and GL2 in the XY plane. Fit them into the two spatial line types of the upper arches GL1 and GL2 in the 3D software;

[0016] Establish a steel arch model. Using the X-axis coordinates of each nodal plane AA of the steel arch as a reference, locate and establish the node lugs and common partitions of the upper arch on the guide lines of the steel arch. The node lugs of the upper arch are established with a plumb bob in the XY plane, and the common partitions are established with the guide lines of the steel arch as normals. The node lugs of the lower arch are established in the XZ plane with their center lines located in the nodal plane AA. Then, the outer contours of all partitions and the guide lines of the steel arch are used as a reference to generate the overall outer contour of the steel arch.

[0017] Establish a steel frame model. Based on the base point O1 (X1, Y1, Z1) of the steel main beam, the distance d1 between the steel frame and the base point of the steel main beam in the vertical plane, and the theoretical height dj of the steel frame, calculate the steel frame base point M (Xm, Ym, Zm) and the crossbeam base point N (Xn, Yn, Zn), where Xm = X1, Ym = Y1 + d1, Zm = Z1 - di = Z1 - d1 × i%; Xn = X1, Yn = Y1 + d1, Zm = Z1 - d1 × i% + dj; then complete the three-dimensional modeling of the steel frame based on the steel frame base point M (Xm, Ym, Zm) and the crossbeam base point N (Xn, Yn, Zn);

[0018] Establish a steel cross-connection model, starting with the ear plate base point P (Xp, Yp, Zp) of the ear plate pin hole on the steel arch side, and ending with the beam base point N (Xn, Yn, Zn) on the steel frame side. Calculate the baseline direction PN (Xn-Xp, Yn-Yp, Zn-Zp) of the steel cross-connection and use it to establish a three-dimensional model.

[0019] In some optional implementation schemes, dividing the segments of the hoisting components of the landscape bridge with a steel arch and steel frame spatial structure system and setting the hoisting points based on the established three-dimensional model includes the following steps:

[0020] According to the structural characteristics of the steel arch, the steel arch is divided into the arch foot section, the arch foot and arch rib transition section, the integral arch rib section, and the split arch rib section for segmental hoisting;

[0021] Divide the steel frame into columns and steel frame beams for segmental hoisting;

[0022] Steel cross-connections with a length greater than 16,000 mm shall be hoisted in two installation segments, while those with a length less than 16,000 mm shall be hoisted as a whole segment.

[0023] In some optional implementation schemes, when setting the lifting points of the lifting component segments of the steel arch steel frame spatial structure system landscape bridge based on the established three-dimensional model, two lifting processes need to be completed: the first is loading and lifting, and the second is installation on the project site;

[0024] The first loading and lifting operation must ensure that the segment is parallel to the transport vehicle. The wire ropes are symmetrically arranged based on the segment's center of gravity. The length of the wire ropes is selected as L1. The lifting lugs are set on the outside of the segment's web. After the wire ropes are installed, the included angle is θ (20°<θ<45°, θ=α, β, γ). The installation direction of the lifting lugs must ensure that the lug plate and the wire rope are in the same direction.

[0025] The second on-site installation of the project needs to ensure the bridge position of the segment. The length of the low-point wire rope is lengthened based on the high-point wire rope length L1. At the same time, the installation direction of the lifting lug is changed so that the lug plate and the wire rope are in the same direction.

[0026] In some optional implementation schemes, numbering the segments of the hoisted components of the landscape bridge with a steel arch and steel frame spatial structure system based on the established three-dimensional model includes the following steps:

[0027] The steel arches are numbered. Since the steel arch is designed as a symmetrical structure in the longitudinal direction of the bridge, the steel arches are divided into the small pile number 0# side and the large pile number 1# side. The middle section of the steel arch is numbered as ZG-1, the section from the mid-span to the small pile number section is set as ZG-i-0#, and the section from the mid-span to the large pile number section is set as ZG-i-1#, where i = 2 to 8; among them, the split arch rib section includes divergent arch ribs and cross-connections between arch ribs. The upper left arch is numbered as ZG-1-Z, ZG-Ok#-Z (O = 2 to 5, k = 0 or 1); the upper right arch is numbered as ZG-1-Y, ZG-Pk#-Y (P = 2 to 5, k = 0 or 1); the lower arch is numbered as ZG-1-X, ZG-Qk#-X (Q = 2 to 5, k = 0 or 1), and 0# and 1# are engraved on the top plates at both ends of the steel arch to distinguish the steel arch. Installation direction of the project site port; the connecting rods between the arch ribs are divided into flat connecting rods, left oblique connecting rods, and right oblique connecting rods. The middle hanger node of the steel arch is j=1, and k=0 or 1 is used to distinguish the small pile number side and the large pile number side. The flat connecting rods are numbered PL-1, PL-jk# (j=2~9); the left oblique connecting rods are numbered XL-1-Z, XL-jk#-Z (j=2~9); the right oblique connecting rods are numbered XL-1-Y, XL-jk#-Y (j=2~9). Z is engraved on the connecting port between the flat connecting rod and the left upper arch, and Y is engraved on the connecting port between the flat connecting rod and the right upper arch; Z is engraved on the connecting port between the left oblique connecting rod and the left upper arch, and X is engraved on the connecting port between the flat connecting rod and the lower arch; Y is engraved on the connecting port between the right oblique connecting rod and the right upper arch, and X is engraved on the connecting port between the flat connecting rod and the lower arch;

[0028] The steel frame is numbered and divided into two parts: columns and steel frame beams. The columns correspond to the hanger nodes, with the middle hanger node of the steel arch as j=1, and k=0 or 1 to distinguish the small pile number side from the large pile number side. The steel frame columns on the left are numbered LZ-1-Z, LZ-jk#-Z (j=2~9); the steel frame columns on the right are numbered LZ-1-Y, LZ-jk#-Y (j=2~9); the steel frame beams are numbered symmetrically from the middle of the bridge span to both sides, with the steel frame beams on the left being numbered HL-mk#-Z and the steel frame beams on the right being numbered HL-mk#-Y, with m=1~9. 0# and 1# are engraved on the top plates at both ends of the steel frame beams to distinguish the installation direction of the ports at the project site.

[0029] The steel cross-connections are numbered. The steel cross-connections are divided into inner steel cross-connections and outer steel cross-connections, and the number corresponds to the hanger nodes. The middle hanger node of the steel arch is j=1, and k=0 or 1 is used to distinguish the small pile number side and the large pile number side. The inner steel cross-connections on the left are numbered NHL-1-Z, NHL-jk#-Z (j=2~9); the outer steel cross-connections on the left are numbered WHL-1-Z, WHL-jk#-Z (j=2~9); the inner steel cross-connections on the right are numbered NHL-1-Y, NHL-jk#-Y (j=2~9); the outer steel cross-connections on the right are numbered WHL-1-Y, WHL-jk#-Y (j=2~9).

[0030] In some optional implementation schemes, when setting up a bracket to install a landscape bridge with a steel arch and steel frame spatial structure system, the following steps are included:

[0031] For steel arch installation, the first step is to erect the bracket. A steel arch assembly bracket is set up at the X-axis docking port of the overall coordinate system of the steel arch segment. The support points of the steel arch assembly bracket for the steel arch segment are set at 500mm on both sides of the docking port. The spatial coordinates Di (Xi, Yi, Zi) of the contact points between the support points of each steel arch segment and the bottom surface of the steel arch are extracted from the established three-dimensional model. The elevation value Zi of each support point is determined by the relative position relationship between different spatial coordinates Di and the reference point O (0, 0, 0) of the entire system; then rough positioning and installation are carried out, and the steel arch segments transported to the project site are hoisted onto the steel arch assembly bracket. The steel arch segments are assembled for the first time in the correct port docking order. The elevation value Zi of the steel arch segment is first controlled by the elevation of the support point of the steel arch assembly bracket to meet the theoretical requirements. The overall installation sequence is designed to start from the arch foot section, the arch foot and the arch rib transition section. , the integral arch rib segment, and the split arch rib segment are installed in sequence; then the key points are measured, and the steel arch segment is roughly positioned and installed to confirm whether it meets the positioning requirements. The key points are selected for measurement and the difference between the measured points and the theoretical coordinate values ​​is evaluated before precise adjustment. Each steel arch segment selects more than 2 control points to cooperate with the determination of the support point elevation value Zi on the steel arch assembly bracket to ensure the accurate installation of the steel arch segment; finally, precise adjustment is performed, and the actual coordinate value of the control point of the steel arch segment is measured to be A1 (X1, Y1, Z1), and the theoretical coordinate value of the control point is obtained by the three-dimensional model A0 (X0, Y0, Z0), and the X-direction deviation ΔX=X1-X0, Y-direction deviation ΔY=Y1-Y0, and Z-direction deviation ΔZ=Z1-Z0 are calculated, and the X-direction deviation ΔX and Y-direction deviation ΔY are adjusted in sequence. The Z-direction deviation ΔZ=0 is determined according to the bracket elevation;

[0032] For steel frame installation, use the steel frame base point M (Xm, Ym, Zm) and the beam base point N (Xn, Yn, Zn) as the upper and lower positioning reference points to install the steel frame columns in sequence, and then use the two steel frame columns as support to install the steel frame beams;

[0033] Installation of steel cross-joints: When manufacturing the steel cross-joints, a joint is reserved on the steel frame column. The cut of the joint is parallel to the direction of the steel frame column. When installing the steel cross-joints, first connect one side of the pin shaft opening. After the pin shaft is installed, rotate the steel cross-joint with the pin shaft as the center of the circle to the fracture to complete the connection with the steel frame opening.

[0034] During the installation of the hangers, the steel arch assembly bracket should be retained when installing the inner and outer hangers, and the tension of the inner and outer hangers should be calculated to ensure that the transverse bridge forces acting on the steel frame by the inner and outer hangers are in real-time dynamic balance. The inner and outer hangers should be tensioned at the same time until the entire steel arch and steel frame spatial structure system and landscape bridge system are fully balanced. After that, the steel arch assembly bracket should be removed.

[0035] In some optional implementation schemes, when more than two control points are selected for each steel arch segment, the control points of the arch foot and arch rib transition section and the overall arch rib section are the lower hanger nodes, and the midpoint of the line connecting the center lines of the two pins of the lower hanger on the outer wall of the ear plate and the center point of the lower arch bottom plate port are selected as control points; the upper arch of the split arch rib section uses the center points of the two pin ear plate pins as control points, and the lower arch of the split arch rib section uses the midpoint of the line connecting the center lines of the two pins of the two lower hangers on the outer wall of the ear plate as control point.

[0036] The beneficial effects of the present application are as follows: the installation method of the steel arch steel frame space structure system landscape bridge provided by the present application comprises the following steps: establishing a three-dimensional model of the steel arch steel frame space structure system landscape bridge structure based on the steel main beam; dividing the hoisting component segments of the steel arch steel frame space structure system landscape bridge based on the established three-dimensional model, and completing the setting and numbering of the hoisting point of the hoisting component segments; establishing an overall coordinate system on site according to the three-dimensional model, drawing the inner hanger longitudinal baseline, steel frame longitudinal baseline, and outer hanger longitudinal baseline along the longitudinal direction of the bridge, drawing the hanger node transverse baseline along the transverse direction of the bridge, and setting up a bracket to install the steel arch steel frame space structure system landscape bridge, and after installing the inner hanger and the outer hanger, tensioning and lifting them simultaneously until the entire steel arch steel frame space structure system landscape bridge system completes force balance, and then dismantling the steel arch assembly bracket. The installation method of the steel arch steel frame space structure system landscape bridge provided by the present application can facilitate the extraction of theoretical data of control nodes for bridge construction for measurement and positioning by establishing a three-dimensional model, thereby improving the positioning accuracy of bridge construction and reducing the difficulty of construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0038] Figure 1A schematic structural diagram of a first-perspective landscape bridge of a steel arch and steel frame spatial structure system in an installation method of a landscape bridge of a steel arch and steel frame spatial structure system provided in an embodiment of the present application;

[0039] Figure 2 A schematic structural diagram of a steel arch steel frame spatial structure system landscape bridge from a second perspective, wherein the steel main beam is omitted in the installation method of the steel arch steel frame spatial structure system landscape bridge provided in an embodiment of the present application;

[0040] Figure 3 A schematic structural diagram of a steel arch steel frame spatial structure system landscape bridge from a third perspective in the installation method of the steel arch steel frame spatial structure system landscape bridge provided in an embodiment of the present application;

[0041] Figure 4 A schematic diagram of a first perspective of establishing a coordinate system based on the intersection of the theoretical guide line of the arch box section and the support centerline in the installation method of the steel arch steel frame spatial structure system landscape bridge provided in an embodiment of the present application;

[0042] Figure 5 A schematic diagram of a second perspective of establishing a coordinate system based on the intersection of the theoretical guide line of the arch box section and the support centerline in the installation method of the steel arch steel frame spatial structure system landscape bridge provided in an embodiment of the present application;

[0043] Figure 6 A schematic diagram of establishing a steel arch elevation coordinate system transformation using the vertex of the elevation projection of the upper arch guide line as the origin in the installation method of the steel arch steel frame spatial structure system landscape bridge provided in an embodiment of the present application;

[0044] Figure 7 A schematic diagram of establishing a steel arch facade line shape in the installation method of a landscape bridge with a steel arch and steel frame spatial structure system provided in an embodiment of the present application;

[0045] Figure 8 A schematic diagram of a first-perspective view of positioning and establishing upper arch node ear plates and common partitions on a steel arch guide line using the coordinates of the X-axis of each node plane AA as a reference in the installation method of a landscape bridge of a steel arch steel frame spatial structure system provided in an embodiment of the present application;

[0046] Figure 9 A schematic diagram of a second perspective of positioning and establishing upper arch node ear plates and common partitions on the steel arch guide line using the coordinates of the X-axis of each node plane AA as a reference in the installation method of the steel arch steel frame spatial structure system landscape bridge provided in an embodiment of the present application;

[0047] Figure 10 This is a first schematic diagram of determining the steel frame base points and beam base points for three-dimensional modeling of the steel frame in the installation method of the steel arch steel frame spatial structure system landscape bridge provided in an embodiment of the present application;

[0048] Figure 11 This is a second schematic diagram of determining the steel frame base points and beam base points for three-dimensional modeling of the steel frame in the installation method of the steel arch steel frame spatial structure system landscape bridge provided in an embodiment of the present application;

[0049] Figure 12 A schematic diagram of establishing a three-dimensional model of steel cross-connections based on the baseline direction of the steel cross-connections in the installation method of the steel arch steel frame spatial structure system landscape bridge provided in an embodiment of the present application;

[0050] Figure 13 A schematic diagram of the method for installing a landscape bridge with a steel arch and steel frame spatial structure system provided in an embodiment of the present application, wherein the steel arch is divided into an arch foot section, an arch foot and arch rib transition section, an integral arch rib section, and a split arch rib section;

[0051] Figure 14 A schematic diagram of numbering the hoisting segments of the steel arch in the installation method of the landscape bridge of the steel arch and steel frame spatial structure system provided in an embodiment of the present application;

[0052] Figure 15 A schematic diagram of drawing an inner hanger longitudinal baseline, a steel frame longitudinal baseline, an outer hanger longitudinal baseline, and a hanger node transverse baseline for the steel arch in the installation method of the steel arch steel frame spatial structure system landscape bridge provided in an embodiment of the present application;

[0053] Figure 16 A schematic diagram of selecting control points on the transition section of the arch foot and arch rib in the installation method of the landscape bridge of the steel arch and steel frame spatial structure system provided in an embodiment of the present application;

[0054] Figure 17 A schematic diagram of selecting control points on an integral arch rib segment in the installation method of a landscape bridge with a steel arch and steel frame spatial structure system provided in an embodiment of the present application;

[0055] Figure 18 A schematic diagram of a first perspective of selecting control points on a split arch rib segment in the installation method of a landscape bridge with a steel arch and steel frame spatial structure system provided in an embodiment of the present application;

[0056] Figure 19 This is a schematic diagram of a second perspective of selecting control points on the split arch rib segment in the installation method of the steel arch and steel frame spatial structure system landscape bridge provided in an embodiment of the present application.

[0057] In the figure: 100, steel main beam; 110, steel arch; 111, arch foot section; 112, arch foot and arch rib transition section; 113, integral arch rib section; 114, split arch rib section; 120, steel frame; 121, steel frame crossbeam; 122, steel frame column; 130, steel cross-connection; 131, inner steel cross-connection; 132, outer steel cross-connection; 140, lower arch; 150, upper arch; 160, oblique connection; 170, parallel connection; 180, arch box section; 190, inner hanger; 200, outer hanger; 210, control point. DETAILED DESCRIPTION

[0058] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0059] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the present application without creative work are within the scope of protection of the present application.

[0060] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0061] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the product of this application is typically placed when in use. These terms are intended only to facilitate the description of this application and simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0062] Furthermore, terms such as "horizontal," "vertical," and "overhanging" do not necessarily imply that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0063] It should also be noted that, in the description of this application, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0064] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0065] The following is a further detailed description of the characteristics and performance of the installation method of the landscape bridge with a steel arch and steel frame spatial structure system of the present application in conjunction with the embodiments.

[0066] The embodiment of the present application provides a method for installing a landscape bridge of a steel arch steel frame space structure system, such as Figure 1 、 Figure 2 and Figure 3 As shown, the steel arch and steel frame spatial structure system landscape bridge includes a steel main beam 100, a steel arch 110, two steel frames 120 respectively arranged on both sides of the steel arch 110 and thirty-eight steel cross-links 130. The bottom of the steel frame 120 is connected to the steel main beam 100, and the steel arch 110 includes a lower arch 140, two upper arches 150 respectively arranged on both sides above the lower arch 140, fifteen oblique links 160 respectively connected to the lower arch 140 and the upper arch 150, fifteen parallel links 170 respectively connected to the two upper arches 150 and two arch box sections 180. The two ends of the lower arch 140 and the two upper arches 150 are respectively connected to the two arch box sections 180, and the two arch box sections 180 are respectively connected to the steel main beam 100. Fifteen inner hangers 190 are connected between the beams 100, and each upper arch 150 is connected to fifteen steel cross-links 130. Each steel cross-link 130 is connected to the steel frame 120. The steel frame 120 includes a steel frame crossbeam 121 and nineteen steel frame columns 122. The top and bottom of the steel frame columns 122 are respectively connected to the steel frame crossbeam 121 and the steel main beam 100. Each steel cross-link 130 includes an inner steel cross-link 131 and an outer steel cross-link 132. One end of the inner steel cross-link 131 and the outer steel cross-link 132 are respectively connected to the steel frame crossbeam 121 of the corresponding side steel frame 120, the other end of the inner steel cross-link 131 is connected to the corresponding upper arch 150, and the other end of the outer steel cross-link 132 is connected to the corresponding outer hanger 200.

[0067] The installation method of the steel arch steel frame spatial structure system landscape bridge provided in the embodiment of the present application includes the following steps:

[0068] S1. Establishing a three-dimensional model of a landscape bridge structure of a steel arch and steel frame spatial structure system based on the steel main beam 100, which includes the following steps:

[0069] S11. Establish the structural system benchmark; e.g. Figure 4 and Figure 5 As shown, the intersection of the theoretical guide line of the arch box section 180 and the center line of the support is used as the reference origin O(0,0,0), and the longitudinal bridge direction is used as the X axis, the transverse bridge direction is used as the Y axis, and the vertical plane is used as the Z axis to establish an overall coordinate system. This facilitates the construction of a three-dimensional model from bottom to top based on the bridge deck.

[0070] S12. Establish theoretical guide lines for steel arches, such as Figure 6 The vertex of the elevation projection of the guide line of the upper arch 150 is the origin, the direction of the arch foot of the upper arch 150 is the positive X direction, and the downward direction of the plumb bob is the positive Y direction. The bridge deck is used as the reference to model the steel arch system from the bridge deck to perform coordinate system conversion. The design coordinate system is (X, Y), and the new coordinate system is (X1, Z1), X = -(X1 + D1 / 2 - D2), Y = -(Z1 + D3), D1 is the longitudinal length of the steel main beam 100, D2 is the distance between the support center line of the arch box section 180 and the end face of the corresponding steel main beam 100 at one end, and D3 is the distance between the steel main beam 100 and the guide line of the upper arch 150;

[0071] S13. Create the steel arch facade line type, such as Figure 7 As shown, the steel arch 110 is divided into an arch box section (Xo<X<Xa, Xa'<X<Xo') with a standard circular curve facade and an arch rib section (Xa<X<Xa') with a parabolic facade according to the structural form. The parabolic equation of the upper arch 150 (GL1, GL2) is Y=4f1 / (L1 2 )X 2 The parabola equation of the lower arch 140GL3 is Y=4f2 / (L2 2 )X 2 +c, where f, L, and c are constants. The modeling line type according to the coordinate transformation is: The vertical equation of the upper arch 150 is: Z1 = -4f1 / (L1 2 )(X1+D1 / 2-D2) 2 -D3 (Xa<X1<Xa'), the elevation equation of the lower arch 140 is: Z1=-4f2 / (L2 2 )X1 2 +c-D3(Xa<X1<Xa');

[0072] S14. Establishing a spatial line type of the steel arch. The planar projection of the guide line of the arch box section 180 is a straight line, the planar projection of the arch guide line of the upper arch 150 (GL1, GL2) is a circular arc line, the centerline plane of the lower arch 140 is a straight line, and the planar curves of the upper arch 150 (GL1, GL2) are arranged symmetrically with respect to the lower arch 140GL3. First, draw the vertical line type of the steel arch after adding pre-camber in the XZ plane, then draw the planar circular arc line type of the arch guide line of the upper arch 150 (GL1, GL2) in the XY plane, and fit them into two spatial line types of the upper arch 150 (GL1, GL2) in 3D software.

[0073] S15. Build a steel arch model, such as Figure 8 and Figure 9 As shown, with the coordinates of the X-axis of each nodal plane AA of the steel arch 110 as a reference, the node ear plates and common partitions of the upper arch 150 are located and established on the guide lines of the steel arch 110, wherein the node ear plates of the upper arch 150 are established with a plumb bob in the XY plane, and the common partitions are established with the guide lines of the steel arch 110 as normals. The node ear plates of the lower arch 140 are established in the XZ plane with their center lines located in the nodal plane AA, and then the overall outer contour of the steel arch 110 is generated with the outer contours of all partitions and the guide lines of the steel arch 110 as a reference;

[0074] S16. Build a steel frame model, such as Figure 10 and Figure 11 As shown, based on the base point O1 (X1, Y1, Z1) of the steel main beam 100, the distance d1 between the steel frame crossbeam 121 of the steel frame 120 and the vertical plane where the base point of the steel main beam 100 is located, and the theoretical height dj of the steel frame 120, the steel frame base point M (Xm, Ym, Zm) and the crossbeam base point N (Xn, Yn, Zn) are calculated, where Xm = X1, Ym = Y1 + d1, Zm = Z1 - di = Z1 - d1 × i%; Xn = X1, Yn = Y1 + d1, Zm = Z1 - d1 × i% + dj; then, the three-dimensional modeling of the steel frame 120 is completed based on the steel frame base point M (Xm, Ym, Zm) and the crossbeam base point N (Xn, Yn, Zn);

[0075] S17, establish a steel cross-connection model, such as Figure 12 As shown, starting from the ear plate base point P (Xp, Yp, Zp) where the ear plate pin hole is established on the steel arch 110 side, and ending at the crossbeam base point N (Xn, Yn, Zn) on the steel frame 120 side, the baseline direction of the steel cross link 130 is calculated. (Xn-Xp, Yn-Yp, Zn-Zp), since the base point P and the base point N are in the same X value plane

[0076] Xn=Xp, so the baseline direction of the steel cross-connection 130 can be simplified to (0, Yn-Yp, Zn-Zp), and use this to build a three-dimensional model.

[0077] S2. Divide the hoisting component segments of the steel arch and steel frame spatial structure landscape bridge based on the established three-dimensional model, and complete the setting and numbering of the hoisting point segments;

[0078] S21. When dividing the sections of the hoisting components, Figure 13 As shown, based on the structural characteristics of the steel arch 110, the steel arch is divided into an arch foot section 111, an arch foot and arch rib transition section 112, an integral arch rib section 113, and a split arch rib section 114 for segmented hoisting. The main purpose of dividing the arch foot section 111 is to reduce the difficulty of positioning the steel arch 110 with the bridge deck. The lower end of the arch foot section 111 includes the bridge deck top plate and the steel arch rib plate that connects to the bridge deck. Due to the special-shaped structure of the arch foot section 111, to facilitate the connection between the arch foot section 111 and the next segment, the upper end of the arch foot section 111 must avoid the arc transition area of ​​the steel arch rib plate and be set in the variable-section box area. At the same time, the height of the arch foot section 111 must be minimized to prevent it from being too high to be transported. The arch foot and arch rib transition section 112 is set as the steel arch structure and force system conversion area, including a lower hanger ear plate and the node where the variable-section arch box diverges into three separate arch ribs. In order to avoid the impact of on-site welding on the lower boom ear plate, the lower end of the arch foot and arch rib transition section 112 needs to be set more than 1000 mm away from the ear plate.

[0079] The steel frame 120 is divided into steel frame cross beams 121 and steel frame columns 122 for segmental hoisting; the steel cross link 130 with a length greater than 16000mm is hoisted as two installation segments, and the steel cross link 130 with a length less than 16000mm is hoisted as an integral segment.

[0080] S22. When setting the lifting point of the lifting component segment, two lifting processes need to be completed. The first is loading and lifting, and the second is installation on the project site. Among them, the first loading and lifting needs to ensure the parallel relationship between the segment and the transport vehicle, and the wire ropes are symmetrically arranged based on the center of gravity of the segment. The length of the wire ropes is selected as L1. The lifting lugs are set on the outside of the segment web. After the wire rope is installed, the angle is θ (20°<θ<45°, θ=α, β, γ). The installation direction of the lifting lugs needs to ensure that the lug plate and the wire rope are in the same direction. The second on-site installation needs to ensure the bridge position of the segment. The length of the low-point wire rope is lengthened based on the high-point wire rope length L1, and the installation direction of the lifting lugs is changed so that the lug plate and the wire rope are in the same direction.

[0081] S23. Numbering of segments of hoisted components includes:

[0082] like Figure 14As shown, the steel arch 110 is numbered. Since the steel arch 110 is designed as a longitudinal symmetrical structure, the steel arch 110 is divided into a small pile number 0# side and a large pile number 1# side. The middle section of the steel arch 110 is numbered as ZG-1, the sections from the mid-span to the small pile number sections are set as ZG-i-0#, i=2~8, and the sections from the mid-span to the large pile number sections are set as ZG-i-1#, i=2~8; wherein, the split arch rib section 114 includes The divergent arch ribs and the cross-connections between the arch ribs are numbered as ZG-iZ (i=1), ZG-ik#-Z (i=2~5, k=0 or 1) for the upper left arch; ZG-iY (i=1), ZG-ik#-Y (i=2~5, k=0 or 1) for the upper right arch; and ZG-iX (i=1), ZG-ik#-X (i=2~5, k=0 or 1) for the lower arch. 0# and 1# are printed to distinguish the installation direction of the steel arch 110 at the project site. The transverse joints between the arch ribs are divided into parallel joints, left oblique joints, and right oblique joints. The middle hanger node of the steel arch 110 is j=1, and k=0 or 1 is used to distinguish the small pile number side and the large pile number side. The parallel joints are numbered PL-j (j=1), PL-jk# (j=2~9); the left oblique joints are numbered XL-jZ (j=1), XL-jk#-Z (j=2~9); the right oblique joints are numbered XL-jY (j=1), XL-jk#-Y (j=2~9). Z is engraved at the parallel joint and the left upper arch connection port, and Y is engraved at the parallel joint and the right upper arch connection port; Z is engraved at the left oblique joint and the left upper arch connection port, and X is engraved at the parallel joint and the lower arch connection port; Y is engraved at the right oblique joint and the right upper arch connection port, and X is engraved at the parallel joint and the lower arch connection port.

[0083] The steel frame 120 is numbered and is divided into two parts: a steel frame crossbeam 121 and a steel frame column 122. The steel frame column 122 corresponds to the hanger node. The middle hanger node of the steel arch 110 is j=1, and k=0 or 1 is used to distinguish the small pile number side and the large pile number side. The steel frame column 122 on the left is numbered LZ-jZ (j=1), LZ-jk#-Z (j=2~9); the steel frame column 122 on the right is numbered LZ-jZ (j=1), LZ-jk#-Z (j=2~9); 22 are numbered LZ-jY (j=1), LZ-jk#-Y (j=2~9); the steel frame crossbeams 121 are numbered symmetrically from the middle of the bridge span to both sides, with the left steel frame crossbeam 121 numbered HL-mk#-Z and the right steel frame crossbeam 121 numbered HL-mk#-Y, with m=1~9. 0# and 1# are engraved on the top plates at both ends of the steel frame crossbeam 121 to distinguish the installation direction of the ports on the project site;

[0084] The steel cross-links 130 are numbered. The steel cross-links 130 are divided into two parts, an inner steel cross-link 131 and an outer steel cross-link 132. The number of the two parts corresponds to the hanger nodes. The middle hanger node of the steel arch 110 is j=1, and k=0 or 1 is used to distinguish the small pile number side and the large pile number side. The inner steel cross-link 131 on the left is numbered NHL-jZ (j=1), NHL-jk#-Z (j=2~9); the outer steel cross-link 132 on the left is numbered WHL-jZ (j=1), WHL-jk#-Z (j=2~9); the inner steel cross-link 131 on the right is numbered NHL-jY (j=1), NHL-jk#-Y (j=2~9); the outer steel cross-link 132 on the right is numbered WHL-jY (j=1), WHL-jk#-Y (j=2~9).

[0085] S3, such as Figure 15 As shown, an overall coordinate system is established on site according to the three-dimensional model, and the inner hanger longitudinal baseline, steel frame longitudinal baseline, and outer hanger longitudinal baseline are drawn along the longitudinal direction of the bridge, and the hanger node horizontal baseline is drawn along the transverse direction of the bridge. A bracket is set up to install the steel arch steel frame space structure system landscape bridge, and after the inner and outer hangers are installed, they are tensioned and lifted simultaneously until the entire steel arch steel frame space structure system landscape bridge system completes force balance, and then the steel arch assembly bracket is dismantled; when drawing the hanger node horizontal baseline, the horizontal baseline of the inner hanger 190 and the corresponding outer hanger 200 coincide.

[0086] Among them, when installing the steel arch 110, the steel arch assembly bracket is first erected, and the steel arch assembly bracket is erected at the X-direction docking port of the overall coordinate system of the steel arch segment. The support points of the steel arch assembly bracket for the steel arch segment are set at 500mm on both sides of the docking port. The spatial coordinates Di (Xi, Yi, Zi) of the support point of each steel arch segment and the contact point of the steel arch bottom surface are extracted from the established three-dimensional model. The elevation value Zi of each support point is determined by the relative position relationship between different spatial coordinates Di and the reference point O (0, 0, 0) of the entire system; then the rough positioning installation is carried out, and the steel arch segments transported to the project site are hoisted onto the steel arch assembly bracket, and each steel arch segment is assembled. The first assembly of the segment is carried out in the correct port docking order. The elevation value Zi of the steel arch segment is first controlled to meet the theoretical requirements through the elevation of the support point of the steel arch assembly bracket. The overall installation sequence is designed to be installed in sequence from the arch foot segment 111, the arch foot arch rib transition segment 112, the overall arch rib segment 113, and the split arch rib segment 114; then the key points are measured, and the steel arch segment is roughly positioned and installed to confirm whether it meets the positioning requirements. The key points are selected for measurement and the difference between the measured points and the theoretical coordinate values ​​is evaluated before precise adjustment. More than two control points are selected for each steel arch segment to cooperate with the determination of the support point elevation value Zi on the steel arch assembly bracket to ensure the accurate installation of the steel arch segment; such as Figure 16 and Figure 17As shown, when more than two control points 210 are selected for each steel arch segment, the control points 210 of the arch foot and arch rib transition section 112 and the integral arch rib section 113 are the nodes of the lower hanger rod, and the midpoint of the line connecting the center lines of the two pins of the lower hanger rod on the outer wall of the ear plate and the center point of the lower arch bottom plate port are selected as the control points 210; Figure 18 and Figure 19 As shown, the upper arch of the split arch rib segment 114 uses the center points of the two pin lug pins as the control point 210, and the lower arch of the split arch rib segment 114 uses the midpoint of the line connecting the center lines of the two pins of the two lower suspenders on the outer wall of the lug as the control point 210. Finally, precise adjustment is performed, and the actual coordinate value of the control point of the steel arch segment is measured to be A1 (X1, Y1, Z1). The theoretical coordinate value of the control point is obtained by the three-dimensional model, and the X-direction deviation ΔX = X1-X0, the Y-direction deviation ΔY = Y1-Y0, and the Z-direction deviation ΔZ = Z1-Z0 are calculated. The X-direction deviation ΔX and the Y-direction deviation ΔY are adjusted in sequence. The Z-direction deviation ΔZ = 0 is determined according to the bracket elevation.

[0087] The steel frame 120 is installed by sequentially installing the steel frame columns 122 with the steel frame base point M (Xm, Ym, Zm) and the beam base point N (Xn, Yn, Zn) as the upper and lower positioning reference points, and then installing the steel frame beam 121 with the two steel frame columns 122 as support;

[0088] Installation of the steel cross-joint 130. When manufacturing the steel cross-joint 130, a joint is reserved on the steel frame column 122. The cut of the joint is parallel to the direction of the steel frame column 122. When installing the steel cross-joint 130, first connect one side of the pin shaft opening. After the pin shaft is installed, rotate the steel cross-joint 130 with the pin shaft as the center to the fracture to complete the connection with the steel frame 120.

[0089] During the installation of the hangers, the steel arch assembly bracket is retained when installing the inner hanger 190 and the outer hanger 200, and the tension of the inner hanger 190 and the outer hanger 200 is calculated to ensure that the transverse bridge force exerted by the inner hanger 190 and the outer hanger 200 on the steel frame 120 maintains real-time dynamic balance. At the same time, the inner hanger 190 and the outer hanger 200 are tensioned until the entire steel arch and steel frame spatial structure system landscape bridge system is fully balanced, and then the steel arch assembly bracket is removed.

[0090] The installation method of the steel arch steel frame space structure system landscape bridge provided in the embodiment of the present application establishes a three-dimensional model of the overall steel arch steel frame space structure system landscape bridge structure, which is convenient for obtaining the theoretical data of the control nodes in the space of each installation segment, and completes the reasonable division of the lifting segments of the spatial special-shaped structure based on the three-dimensional model, fully considering the arrangement of lifting points during segment loading and on-site installation, and at the same time systematically numbering the lifting components of the steel arch steel frame space structure system landscape bridge structure, effectively solving the problem of difficulty in matching installation after shipment, and realizing the precise positioning of each segment through the five-step process of bracket erection, rough positioning installation, key point measurement, precise adjustment and welding construction during bridge construction, ensuring that the three-dimensional model theoretical data of the steel arch steel frame space structure system landscape bridge structure is applicable to the positioning relationship during structural installation, and effectively solving the influence of external factors such as dead load and hanger installation on the installation of the structural system.

[0091] The embodiments described above are part of the embodiments of the present application, rather than all of the embodiments. The detailed description of the embodiments of the present application is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

Claims

The bridge is connected to the upper and lower ends of the steel frame by a plurality of steel cross links, the steel frame being connected to the lower and upper ends of the steel frame by a plurality of steel cross links. The installation method of the steel arch steel frame space structure system landscape bridge comprises the following steps: The three-dimensional model of the landscape bridge structure of the steel arch and steel frame spatial structure system is established based on the steel main beam, including the following steps: Establish a structural system benchmark; take the intersection of the theoretical guide line of the arch box section and the center line of the support as the benchmark origin O (0, 0, 0), and establish an overall coordinate system with the longitudinal bridge direction as the X axis, the transverse bridge direction as the Y axis, and the vertical plane as the Z axis; Establish a theoretical guide line for the steel arch, with the vertex of the vertical projection of the guide line of the upper arch as the origin, the direction of the arch foot of the upper arch as the positive X direction, and the downward direction of the plumb bob as the positive Y direction. Take the bridge deck as the reference and model the steel arch system from the bridge deck to perform the coordinate system transformation. The design coordinate system is (X, Y), and the new coordinate system is (X1, Z1), X=-(X1+D1 / 2-D2), Y=-(Z1+D3), D1 is the longitudinal length of the steel main beam, D2 is the distance between the center line of the arch box section support and the end face of the steel main beam at the corresponding end, and D3 is the distance between the steel main beam and the upper arch guide line; establish the vertical line type of the steel arch, and divide the steel arch into an arch box section with a standard circular curve vertical surface, Xo<X<Xa, Xa'<X<Xo', and an arch rib section with a parabola vertical surface, Xa<X<Xa'. The parabolic equations of the upper arches GL1 and GL2 are Y=4f1 / (L1 2 )X 2 The parabolic equation of the lower arch GL3 is Y=4f2 / (L2 2 )X 2 +c, where f, L, and c are constants. The modeling line type according to the coordinate transformation is: The upper arch facade equation is: Z1=-4f1 / (L1 2 )(X1+D1 / 2-D2) 2 -D3, Xa<X1<Xa', the equation of the lower arch facade: Z1=-4f2 / (L2 2 )X1 2 +c-D3, Xa<X1<Xa'; establish the spatial line type of the steel arch, with the plane projection of the guide line of the arch box section as a straight line, the plane projection of the arch guide line of the upper arches GL1 and GL2 as a circular arc line, the center line plane of the lower arch as a straight line, and the plane curves of the upper arches GL1 and GL2 symmetrically arranged relative to the lower arch GL3. First, draw the vertical line type of the steel arch after adding pre-arch in the XZ plane, and then draw the plane circular arc line type of the arch guide line of the upper arches GL1 and GL2 in the XY plane, and fit them into the two spatial line types of the upper arches GL1 and GL2 in the three-dimensional software; Establish a steel arch model, using the coordinates of the X-axis of each node plane AA of the steel arch as a reference, positioning and establishing the node ear plates and common partitions of the upper arch on the guide line of the steel arch, wherein the node ear plates of the upper arch are established with a plumb bob in the XY plane, and the common partitions are established with the guide line of the steel arch as a normal line, and the node ear plates of the lower arch are established in the XZ plane with the center line located in the node plane AA, and then generating the overall outer contour of the steel arch based on the outer contours of all partitions and the guide line of the steel arch; Establish a steel frame model, and calculate the steel frame base point M (Xm, Ym, Zm) and the crossbeam base point N (Xn, Yn, Zn) based on the base point O1 (X1, Y1, Z1) of the steel main beam, the distance d1 between the steel frame and the base point of the steel main beam in the vertical plane, and the theoretical height dj of the steel frame, where Xm=X1, Ym=Y1+d1, Zm=Z1-di=Z1-d1×i%, i=2-8; Xn=X1, Yn=Y1+d1, Zm=Z1-d1×i%+dj; then complete the three-dimensional modeling of the steel frame based on the steel frame base point M (Xm, Ym, Zm) and the crossbeam base point N (Xn, Yn, Zn); Establish a steel cross-connection model, starting with the ear plate base point P (Xp, Yp, Zp) of the ear plate pin hole on the steel arch side and ending with the beam base point N (Xn, Yn, Zn) on the steel frame side, and calculate the baseline direction of the steel cross-connection (Xn-Xp, Yn-Yp, Zn-Zp), and use this to build a three-dimensional model; Divide the hoisting component segments of the landscape bridge of the steel arch and steel frame spatial structure system based on the established three-dimensional model, and complete the setting and numbering of the hoisting point segments of the hoisting component segments; An overall coordinate system is established on site according to the three-dimensional model, and the inner hanger longitudinal baseline, steel frame longitudinal baseline, and outer hanger longitudinal baseline are drawn along the longitudinal direction of the bridge, and the hanger node transverse baseline is drawn along the transverse direction of the bridge. A bracket is set up to install the steel arch steel frame space structure system landscape bridge, and after the inner hanger and the outer hanger are installed, they are tensioned and lifted simultaneously until the entire steel arch steel frame space structure system landscape bridge system completes force balance, and then the steel arch assembly bracket is dismantled.

2. The method for installing a landscape bridge with a steel arch and steel frame spatial structure system according to claim 1, characterized in that: Dividing the segments of the hoisting components of the landscape bridge of the steel arch and steel frame spatial structure system and setting the hoisting points based on the established three-dimensional model includes the following steps: According to the structural characteristics of the steel arch, the steel arch is divided into an arch foot section, an arch foot and arch rib transition section, an integral arch rib section, and a split arch rib section for segmental hoisting; Dividing the steel frame into columns and steel frame beams for segmental hoisting; The steel cross-connection with a length greater than 16,000 mm is divided into two installation segments for hoisting, and the steel cross-connection with a length less than 16,000 mm is hoisted as an integral segment.

3. The method for installing a landscape bridge with a steel arch and steel frame spatial structure system according to claim 1, characterized in that: When setting the lifting points of the lifting component segments of the steel arch steel frame spatial structure system landscape bridge based on the established three-dimensional model, two lifting processes need to be completed: the first is loading and lifting, and the second is installation on the project site; The first loading and lifting operation must ensure that the segment is parallel to the transport vehicle. The wire ropes are symmetrically arranged based on the segment's center of gravity. The wire rope length is selected as L1. The lifting lugs are set on the outside of the segment's web. After the wire ropes are installed, the included angle is θ, 20°<θ<45°, θ=α, β, γ. The installation direction of the lifting lugs must ensure that the lug plate and the wire rope are in the same direction. The second on-site installation of the project needs to ensure the bridge position of the segment. The length of the low-point wire rope is lengthened based on the high-point wire rope length L1. At the same time, the installation direction of the lifting lug is changed so that the lug plate and the wire rope are in the same direction.

4. The method for installing a landscape bridge with a steel arch and steel frame spatial structure system according to claim 2, characterized in that: The numbering process for the segments of the hoisting components of the landscape bridge of the steel arch and steel frame spatial structure system based on the established three-dimensional model includes the following steps: The steel arches are numbered. Since the steel arch is designed as a longitudinally symmetrical structure, the steel arch is divided into a small pile number 0# side and a large pile number 1# side. The middle section of the steel arch is numbered as ZG-1, the section from the mid-span to the small pile number section is set as ZG-i-0#, and the section from the mid-span to the large pile number section is set as ZG-i-1#, where i=2~8; wherein the split arch rib section includes divergent arch ribs and cross-connections between arch ribs, the upper left arch is numbered as ZG-1-Z, ZG-Ok#-Z, O=2~5, k=0 or 1; the upper right arch is numbered as ZG-1-Y, ZG-Pk#-Y, P=2~5, k=0 or 1; the lower arch is numbered as ZG-1-X, ZG-Qk#-X, Q=2~5, k=0 or 1, and 0# and 1# are engraved on the top plates at both ends of the steel arch to distinguish them. The installation direction of the steel arch at the project site is divided into the connecting rods between the arch ribs, which are divided into flat connecting rods, left oblique connecting rods, and right oblique connecting rods. The middle hanger node of the steel arch is j=1, and k=0 or 1 is used to distinguish the small pile number side and the large pile number side. The flat connecting rods are numbered PL-1, PL-jk#, j=2~9; the left oblique connecting rods are numbered XL-1-Z, XL-jk#-Z, j=2~9; the right oblique connecting rods are numbered XL-1-Y, XL-jk#-Y, j=2~9. Z is engraved at the connecting port between the flat connecting rod and the left upper arch, and Y is engraved at the connecting port between the flat connecting rod and the right upper arch; Z is engraved at the connecting port between the left oblique connecting rod and the left upper arch, and X is engraved at the connecting port between the flat connecting rod and the lower arch; Y is engraved at the connecting port between the right oblique connecting rod and the right upper arch, and X is engraved at the connecting port between the flat connecting rod and the lower arch; The steel frame is numbered and divided into two parts: columns and steel frame beams. The columns correspond to the hanger nodes, with the middle hanger node of the steel arch being j=1, and k=0 or 1 being used to distinguish the small pile number side from the large pile number side. The steel frame columns on the left are numbered LZ-1-Z, LZ-jk#-Z, with j=2~9; the steel frame columns on the right are numbered LZ-1-Y, LZ-jk#-Y, with j=2~9; the steel frame beams are numbered symmetrically from the middle of the bridge span to both sides, with the steel frame beams on the left being numbered HL-mk#-Z, and the steel frame beams on the right being numbered HL-mk#-Y, with m=1~9. 0# and 1# are engraved on the top plates at both ends of the steel frame beams to distinguish the installation direction of the ports at the project site. The steel cross-connections are numbered. The steel cross-connections are divided into inner steel cross-connections and outer steel cross-connections, and the number corresponds to the hanger nodes. The middle hanger node of the steel arch is j=1, and k=0 or 1 is used to distinguish the small pile number side and the large pile number side. The inner steel cross-connections on the left are numbered NHL-1-Z, NHL-jk#-Z, j=2~9; the outer steel cross-connections on the left are numbered WHL-1-Z, WHL-jk#-Z, j=2~9; the inner steel cross-connections on the right are numbered NHL-1-Y, NHL-jk#-Y, j=2~9; the outer steel cross-connections on the right are numbered WHL-1-Y, WHL-jk#-Y, j=2~9.

5. The method for installing a landscape bridge with a steel arch and steel frame spatial structure system according to claim 2, characterized in that: When setting up the support and installing the landscape bridge of the steel arch steel frame space structure system, the following steps are included: For steel arch installation, the bracket is first erected. A steel arch assembly bracket is set up at the X-axis docking port of the overall coordinate system of the steel arch segment. The support points of the steel arch assembly bracket for the steel arch segment are set at 500mm on both sides of the docking port. The spatial coordinates Di (Xi, Yi, Zi) of the contact points between the support points of each steel arch segment and the bottom surface of the steel arch are extracted from the established three-dimensional model. The elevation value Zi of each support point is determined by the relative position relationship between different spatial coordinates Di and the reference point O (0, 0, 0) of the entire system; then rough positioning and installation are carried out, and the steel arch segments transported to the project site are hoisted onto the steel arch assembly bracket. The steel arch segments are assembled for the first time in the correct port docking order. The elevation value Zi of the steel arch segment is first controlled by the elevation of the support point of the steel arch assembly bracket to meet the theoretical requirements. The overall installation sequence is designed to transition from the arch foot segment, arch foot and arch rib The segments, integral arch rib segments, and split arch rib segments are installed in sequence; then, key point measurements are performed, and after rough positioning and installation of the steel arch segments, it is confirmed whether the positioning requirements are met. Key points are selected for measurement, and the difference between the measured points and the theoretical coordinate values ​​is evaluated before precise adjustment is performed. More than two control points are selected for each steel arch segment to cooperate with the determination of the support point elevation Zi on the steel arch assembly bracket to ensure the accurate installation of the steel arch segment; finally, precise adjustment is performed, and the actual coordinate value of the control point of the steel arch segment is measured to be A1 (X1, Y1, Z1), and the theoretical coordinate value of the control point is obtained by the three-dimensional model A0 (X0, Y0, Z0), and the X-direction deviation ΔX=X1-X0, Y-direction deviation ΔY=Y1-Y0, and Z-direction deviation ΔZ=Z1-Z0 are calculated, and the X-direction deviation ΔX and Y-direction deviation ΔY are adjusted in sequence. The Z-direction deviation ΔZ=0 is determined according to the bracket elevation; For steel frame installation, use the steel frame base point M (Xm, Ym, Zm) and the beam base point N (Xn, Yn, Zn) as the upper and lower positioning reference points to install the steel frame columns in sequence, and then use the two steel frame columns as support to install the steel frame beams; Installation of steel cross-joints: When manufacturing the steel cross-joints, a joint is reserved on the steel frame column. The cut of the joint is parallel to the direction of the steel frame column. When installing the steel cross-joints, first connect one side of the pin shaft opening. After the pin shaft is installed, rotate the steel cross-joint with the pin shaft as the center of the circle to the fracture to complete the connection with the steel frame opening. During the installation of the hangers, the steel arch assembly bracket is retained when installing the inner and outer hangers, and the tension of the inner and outer hangers is calculated to keep the transverse bridge force of the inner and outer hangers on the steel frame in real-time dynamic balance. The inner and outer hangers are tensioned at the same time until the entire steel arch and steel frame spatial structure system landscape bridge system completes the force balance, and then the steel arch assembly bracket is removed.

6. The method for installing a landscape bridge with a steel arch and steel frame spatial structure system according to claim 5, characterized in that: When more than two control points are selected for each steel arch segment, the control points of the arch foot and arch rib transition section and the integral arch rib section are the lower hanger nodes, and the midpoint of the line connecting the center lines of the two pins of the lower hanger on the outer wall of the ear plate and the center point of the port of the lower arch bottom plate are selected as control points; the upper arch of the split arch rib section uses the center points of the two pins of the ear plate as control points, and the lower arch of the split arch rib section uses the midpoint of the line connecting the center lines of the two pins of the two lower hangers on the outer wall of the ear plate as control points.

Images