A nested modular guide beam structure and its assembling and erecting method

Abstract

The present application relates to a kind of nested modular guide beam structures, which is composed of several guide beam standard segments and a guide beam lifting segment connected at both ends to form a guide beam structure, both ends of the guide beam structure are guide beam standard segments;The guide beam standard segment is a box girder structure with closed ends and vertical end faces to the bottom surface;The guide beam lifting segment, which is the same height as the guide beam standard segment, is also a box girder structure with closed ends, its top is shorter than the bottom, and the front end face is perpendicular to the bottom surface;Both end faces of the guide beam standard segment and the front end face of the guide beam lifting segment are equipped with the same joint assembly, and the joint assemblies can be connected by locking assemblies when they are arbitrarily connected to each other;The bottom of the rear end face of the guide beam lifting segment is hinged to the end face of the guide beam standard segment, and the top of the rear end face of the guide beam lifting segment is connected to the top of the end face of the guide beam standard segment through an angle adjusting mechanism;The angle between the guide beam standard segment and the guide beam lifting segment is variable.The present application can solve the problem of narrow space for guide beam assembly and effectively improve the speed of bridge erection.

Description

Technical Field

[0001] This invention relates to the field of prefabricated highway steel bridge technology, and in particular to a nested modular guide beam structure and its assembly and erection method. Background Technology

[0002] Prefabricated steel highway bridges play an important role in disaster relief and rescue. Existing prefabricated steel highway bridges use a front-end double main beam truss structure for auxiliary bridge erection during cantilever construction, which has the following drawbacks: the structure is scattered, there are many types and numbers of components, the height of the truss makes manual operation inconvenient, the labor intensity is high, the required length of the erection site is long, the assembly and erection speed is slow, and after the bridge is pushed to the other side, the front-end double main beam truss structure must be completely dismantled before the bridge end columns can be installed before the bridge span can be lowered onto the bridge supports. The bridge placement speed is slow, time-consuming and labor-intensive, and it is not suitable for the rapid requirements of war and emergency rescue conditions.

[0003] Currently, to improve bridge erection speed, new prefabricated highway steel bridges require a new structural form. Standard bridge segments utilize prefabricated trusses, crossbeams, and bridge decks, assembled as a single unit in the factory. The existing auxiliary bridge erection technology using a front-end double-main-girder truss structure for piecework assembly is no longer applicable, as its erection method hinders bridge erection speed. However, the limited space in new prefabricated highway steel bridge structures makes the structural form and assembly method of the guide beams a key technical challenge for successful implementation. The limited assembly space for the guide beams, coupled with the requirement for high structural rigidity, light weight, and rapid assembly, necessitates a completely new technical solution. Summary of the Invention

[0004] In view of this, the present invention provides a nested modular guide beam structure and its assembly and erection method, which can solve the problem of limited space for guide beam assembly and effectively improve the bridge erection speed.

[0005] This invention is achieved through the following technical solution: a nested modular guide beam structure, comprising a guide beam structure consisting of several standard guide beam segments and a guide beam upturned segment connected end to end, with both ends of the guide beam structure being standard guide beam segments; the standard guide beam segments are box girder structures with closed ends and both end faces perpendicular to the bottom surface; the guide beam upturned segment, at the same height as the standard guide beam segments, is a box girder structure with closed ends and its top shorter than its bottom, with the front end face of the guide beam upturned segment perpendicular to the bottom surface; both end faces of the standard guide beam segments and the front end face of the guide beam upturned segment are fixed with corresponding... The same joint components can be connected to each other by locking components; the bottom of the rear end face of the guide beam lifting segment is hinged to the bottom of the end face of the connected guide beam standard segment, and the top of the rear end face of the guide beam lifting segment is connected to the top of the end face of the connected guide beam standard segment through an angle adjustment mechanism, and the included angle between the guide beam standard segment and the guide beam lifting segment is variable; both sides of the guide beam standard segment and the guide beam lifting segment are provided with grooves for cooperating with the support rollers inside the bridge standard segment, so that the guide beam structure can slide within the bridge standard segment.

[0006] Furthermore, the standard segment of the guide beam includes a rectangular plate, a crossbeam, and longitudinal beam I. Two parallel rectangular plates are fixed together by crossbeams evenly distributed along their length, and both ends of the rectangular plates are provided with crossbeams. The longitudinal beam I is the same length as the rectangular plate, and four longitudinal beams I are fixed to the bottom and top of the opposite sides of the two rectangular plates, respectively. The longitudinal beams I are aligned with the edges of the rectangular plates, and the space between the rectangular plates and the two longitudinal beams I fixed thereon forms a groove. The guide beam lifting segment includes a trapezoidal plate, longitudinal beam II, a front end plate, a rear end plate, and a double-ear connector. Head Ⅰ consists of two parallel trapezoidal plates fixedly connected by a front end plate and a rear end plate. Two longitudinal beams Ⅱ, with the same length as the long side of the trapezoidal plates, are fixed to the bottom of the opposite sides of the two trapezoidal plates, with the bottom edge of the longitudinal beams Ⅱ aligned with the bottom edge of the trapezoidal plates. Two double-eared connectors Ⅰ, with the same length as the short side of the trapezoidal plates, are fixed to the top of the opposite sides of the two trapezoidal plates, with the opening of the double-eared connectors Ⅰ facing the rear end plate and the top edge of the double-eared connectors Ⅰ aligned with the top edge of the trapezoidal plates. The space between the trapezoidal plates and the double-eared connectors Ⅰ and longitudinal beams Ⅱ fixed thereon forms a groove.

[0007] Furthermore, the joint assembly includes two double-eared joints III and two single-eared joints III; the two double-eared joints III on both ends of the standard segment of the guide beam are respectively fixed to two diagonally opposite longitudinal beams I, and the two single-eared joints III are respectively fixed to two other longitudinal beams I; on the front end of the guide beam lifting segment, the two double-eared joints III are respectively fixed to the diagonally opposite longitudinal beam II and the closed end of the double-eared joint I, and the two single-eared joints III are respectively fixed to another longitudinal beam II and the closed end of another double-eared joint I; on the rear end of the guide beam lifting segment, the longitudinal beam II with the single-eared joint III fixed at the front end is fixed to the rear end of the longitudinal beam II, and the longitudinal beam II with the double-eared joint III fixed at the front end is fixed to the rear end of the single-eared joint II, and the double-eared joints II and the single-eared joints II are respectively connected to the single-eared joints III and double-eared joints III at the corresponding positions of the connected standard segment of the guide beam.

[0008] Furthermore, the top of the rear end face of the guide beam lifting segment is connected to the top of the end face of the connected guide beam standard segment via two angle adjustment mechanisms. Each of the two angle adjustment mechanisms has a single-ear connector I with several connecting holes at its front end. The connecting holes at the same position on both angle adjustment mechanisms are detachably connected to two double-ear connectors I at the top of the guide beam lifting segment via pins. The rear end of the angle adjustment mechanism on the same side as the longitudinal beam II with single-ear connectors II has double-ear connectors II, and the rear end of the angle adjustment mechanism on the same side as the longitudinal beam II with double-ear connectors II has single-ear connectors II. The double-ear connectors II and single-ear... Connector II is connected to the single-ear connector III and double-ear connector III at the corresponding positions of the standard sections of the guide beam respectively; among the several connecting holes of the single-ear connector I of the angle adjustment mechanism, there is a connecting hole A, which is L1 away from the connection point at the rear end of the angle adjustment mechanism; the center line of the connecting hole of the double-ear connector I at the top of the guide beam lifting section is L2 away from the front end face of the guide beam lifting section; the distance between the hinge point at the bottom of the guide beam lifting section and the front end face of the guide beam lifting section is L3, L1+L2=L3. When connecting hole A is connected to the double-ear connector I, the standard section of the guide beam and the lifting section of the guide beam are on the same horizontal line.

[0009] Furthermore, the locking assembly includes a rack pin, a guide seat, and a pin-shifting mechanism. The guide seat is a tubular structure with an axial through hole, and the tube wall has an opening that engages with the pin-shifting mechanism. The rack pin engages with the through hole, and one end of the rack pin has a rack that engages with the teeth of the pin-shifting mechanism. Two guide seats are fixed to one side of the standard section of the guide beam and the front end of the upturned section of the guide beam. The through holes of the guide seats engage with the double-ear connector III connection hole and the single-ear connector III connection hole on that side, respectively. When connecting the components, the four rack pins are inserted into the through holes of the guide seats from the double-ear connector III connection hole and the single-ear connector III connection hole, respectively, and the rack engages with the pin-shifting mechanism.

[0010] Furthermore, the guide seat is equipped with a fixing plate, and the pin mechanism is equipped with a clamp seat; the fixing plate and the clamp seat are fixedly connected to the two ends of the standard section of the guide beam or the front end of the upturned section of the guide beam.

[0011] A method for assembling and erecting nested modular guide beams, employing the nested modular guide beam structure described above, comprises the following steps:

[0012] S1: A single guide beam standard segment is inserted into a single bridge standard segment. The groove of the guide beam standard segment cooperates with the support roller on the inner side of the bridge standard segment, and the guide beam standard segment and the bridge standard segment form a combined body. A fixing pin is inserted into the crossbeam of the guide beam standard segment from the top of the bridge standard segment, so that the guide beam standard segment is limited within the bridge standard segment. Several combined bodies are transported to the construction site for assembly.

[0013] S2: Rollers are set up on the bank at the construction site. The assembly is placed on the rollers. When splicing any two assemblies, the locking components are used to connect the connecting components first to complete the assembly between the standard segments of the guide beam, and then the two standard segments of the bridge are connected.

[0014] S3: When assembling the composite body with the rear end face of the guide beam lifting segment, hinge the bottom of the rear end face of the guide beam lifting segment to the bottom of the end face of any guide beam standard segment, and connect the top of the rear end face of the guide beam lifting segment and the top of the end face of the guide beam standard segment through the angle adjustment mechanism, so that the guide beam lifting segment and the guide beam standard segment are on the same straight line. Release the fixing pin on the composite body and push the guide beam lifting segment into the bridge standard segment; then proceed to assemble the next composite body with the front end face of the guide beam lifting segment. First, use the locking component to connect the connecting components on the end face of the guide beam standard segment and the front end face of the guide beam lifting segment of the composite body, and then connect the two bridge standard segments.

[0015] S4: After several components are assembled one by one, several standard guide beam segments and one guide beam lifting segment are assembled into a guide beam structure, and several standard bridge sections are assembled into a bridge structure; the guide beam structure can be pushed out of the bridge structure by supporting rollers until the guide beam lifting segment is pushed out.

[0016] S5: Disconnect the front end of the angle adjustment mechanism from the top of the guide beam lifting segment; lift the standard segment of the guide beam connected to the rear end of the guide beam lifting segment, change its angle with the guide beam lifting segment, reconnect the front end of the angle adjustment mechanism to the top of the guide beam lifting segment, and finally fix the beam standard segment and the guide beam lifting segment at a relatively fixed angle.

[0017] S6: Continue pushing the guide beam structure out until two-thirds of the guide beam structure is pushed out of the bridge structure as a cantilever section, and the remaining one-third of the guide beam structure is limited within the bridge structure using fixed pins; push the guide beam structure and the bridge structure as a whole structure to the opposite bank with the support of rollers, and the front end of the guide beam structure reaches the opposite bank to set up rollers.

[0018] S7: Continue pushing the overall structure until the bridge structure is safely pushed to the bridge position; release the connection between the front end of the angle adjustment mechanism and the top of the guide beam lifting segment, flatten the standard segment of the guide beam connected to the rear end of the guide beam lifting segment, so that the guide beam lifting segment and the standard segment of the guide beam are on the same straight line, and reconnect the front end of the angle adjustment mechanism to the top of the guide beam lifting segment; release the fixing pin and push the guide beam structure back into the bridge structure;

[0019] S8: Use fixing pins to fix the guide beam structure to the bridge structure to form the main body of the bridge; finally, assemble the two ends of the bridge to complete the erection.

[0020] Furthermore, the splicing process of any two components in S2 is as follows: Place any end of the guide beam standard segment of any two components opposite each other, and the double-ear connector III and single-ear connector III on the end face of the two guide beam standard segments cooperate with each other. The four rack pins are inserted into the guide seat through hole from the connection hole of the double-ear connector III and the connection hole of the single-ear connector III, respectively. The rack and gear engage to complete the connection of the two guide beam standard segments.

[0021] Furthermore, the assembly process of the combined body and the rear end face of the guide beam lifting segment in S3 is as follows: the connecting holes A of the single-ear connector I at the front end of the two angle adjustment mechanisms are respectively connected to the two double-ear connectors I at the top of the rear end face of the guide beam lifting segment by means of pins; the single-ear connectors II and double-ear connectors II at the rear end of the two angle adjustment mechanisms and at the bottom of the rear end face of the guide beam lifting segment are matched with the double-ear connectors III and single-ear connectors III of the guide beam standard segment; the double-ear connectors III and single-ear connectors III on the side where the guide seat of the guide beam standard segment is located are respectively inserted into the through holes of the guide seat by two rack pins, and are connected by the engagement of the rack and gear; the double-ear connectors III and single-ear connectors III on the other side of the guide beam standard segment are respectively connected by means of pins.

[0022] Furthermore, when the span between the two banks is less than three times the length of the combined structure, step S7 can be replaced by the following steps: stop pushing the overall structure, disconnect the front end of the angle adjustment mechanism from the top of the guide beam lifting segment, flatten the standard segment of the guide beam connected to the rear end of the guide beam lifting segment, reconnect the front end of the angle adjustment mechanism to the top of the guide beam lifting segment, so that the guide beam lifting segment and the standard segment of the guide beam are on the same straight line; fix the front end of the guide beam structure on the opposite bank, and push the bridge structure under the support of the support rollers until the bridge structure is safely pushed to the bridge position.

[0023] Compared with existing technologies, the beneficial effects of this invention are:

[0024] 1. The standard segments of the guide beam of this invention can be nested into the standard segments of the bridge for transportation and assembly as a whole, solving the problem of limited space for guide beam assembly and reducing the length requirements of the erection site; the guide beam lifting segment and angle adjustment mechanism have a simple structure, making lifting convenient and labor-saving; the joint components of the two end faces of the standard segment of the guide beam and the front end face of the lifting segment of the guide beam can be connected to each other through locking components, which can effectively improve the bridge erection speed.

[0025] 2. The standard segment and the curved segment of the guide beam of this invention are made of high-strength thin steel plates by forming and welding, which has high rigidity, light structure, good torsional and bending resistance, and improves structural stability.

[0026] 3. The standard segment of the guide beam of the present invention is provided with orthogonal anisotropic connection joints at both ends, regardless of the first and last end faces, and the assembly does not require inspection or reversing, and has excellent connection and interchangeability performance.

[0027] 4. The standard segment and the raised segment of the guide beam in this invention ensure that the groove is flat and the lower edge is flush. The standard segment of the guide beam is nested in the standard segment of the bridge through the grooves on both sides and the supporting rollers, ensuring that the guide beam structure is smoothly pushed in the bridge structure.

[0028] 5. According to different bridge lengths and lifting height requirements, the lifting segment of the guide beam can be inserted between standard guide beam segments of different numbers. Several standard guide beam segments can be connected to the rear end face of the lifting segment. At the same time, the number and position of the connecting holes on the angle adjustment mechanism can be adjusted to achieve different lifting height requirements, which is highly adaptable.

[0029] 6. This invention has a high degree of modularity and excellent connectivity and interchangeability. Attached Figure Description

[0030] Figure 1 The diagram shows the structural diagram of a standard guide beam segment, where (a) is the elevation view of the standard guide beam segment, (b) is the top view of the standard guide beam segment, (c) is the A-A sectional view of the standard guide beam segment, (d) is the B-B sectional view of the standard guide beam segment, (e) is the E-direction view of the standard guide beam segment, and (f) is the K-direction view of the standard guide beam segment.

[0031] Figure 2 The diagram shows the structure of the locking components, where (a) is the structure of the rack and pin, (b) is the structure of the guide seat, and (c) is the structure of the pin mechanism.

[0032] Figure 3 The diagram shows the structure of the guide beam lifting segment, where (a) is the elevation view of the guide beam lifting segment, (b) is the C-C sectional view of the guide beam lifting segment, (c) is the D-D sectional view of the guide beam lifting segment, and (d) is the F-direction view of the guide beam lifting segment.

[0033] Figure 4 The drawings show the assembly of the standard segments of the guide beam and the standard segments of the bridge, where (a) is the assembly elevation view and (b) is the E-E sectional view of the assembly of the standard segments of the guide beam and the standard segments of the bridge.

[0034] Figure 5 The diagram shows the assembly of the guide beam lifting segment and the guide beam standard segment. (a) shows the state of the guide beam lifting segment before it is pushed into the bridge standard segment, (b) shows the state of the guide beam lifting segment after it is pushed into the bridge standard segment, and (c) shows the F-F sectional view of the assembly of the guide beam lifting segment and the guide beam standard segment.

[0035] Figure 6 This is an assembly diagram of the guide beam structure and the bridge structure.

[0036] Figure 7 This is a diagram showing the warped state of a standard segment of the guide beam.

[0037] Figure 8 This is a magnified view of a section of the guide beam that is tilting upwards.

[0038] Figure 9 This is a diagram of the setup process.

[0039] Among them, 1 - standard segment of guide beam, 2 - guide beam lifting segment, 3 - standard segment of bridge, 4 - roller, 101 - longitudinal beam I, 102 - rectangular plate, 103 - crossbeam, 104 - double-eared joint III, 105 - single-eared joint III, 110 - rack and pinion pin, 111 - pin body, 112 - baffle, 113 - screw I, 114 - rack and pinion, 120 - guide seat, 121 - guide sleeve, 122 - fixing plate, 1 30 - Pin mechanism, 131 - Gear lever, 132 - Clamp seat, 133 - Clamp, 134 - Screw II, 201 - Single-ear connector I, 202 - Double-ear connector I, 203 - Trapezoidal plate, 204 - Longitudinal beam II, 205 - Rear end plate, 206 - Front end plate, 210 - Single-ear connector II, 220 - Double-ear connector II, 230 - Pin, 240 - Pin I, 301 - Fixing pin, 310 - Support roller. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0041] This invention provides a nested modular guide beam structure, such as Figure 6 As shown, the guide beam structure consists of several standard guide beam segments 1 and a guide beam lifting segment 2 connected end to end. Both ends of the guide beam structure are standard guide beam segments 1, and the guide beam lifting segment 2 can be located at any position other than the beginning and end of the guide beam structure.

[0042] The standard guide beam segment 1 is a box girder structure with both ends closed and both end faces perpendicular to the bottom surface. The guide beam upturned segment 2, at the same height as the standard guide beam segment 1, is also a box girder structure with both ends closed and its top shorter than its bottom. The front end face of the upturned guide beam segment 2 is perpendicular to the bottom surface. Both end faces of the standard guide beam segment 1 and the front end face of the upturned guide beam segment 2 are fixed with identical joint components, and any interlocking joint components can be connected by locking components. The bottom of the rear end face of the upturned guide beam segment 2 is hinged to the bottom of the end face of the connected standard guide beam segment 1. The top of the rear end face of the upturned guide beam segment 2 is connected to the top of the end face of the connected standard guide beam segment 1 through an angle adjustment mechanism. The front end of the angle adjustment mechanism is connected to the top of the rear end face of the upturned guide beam segment 1, and the rear end of the angle adjustment mechanism is connected to the top of the end face of the connected standard guide beam segment 1. The included angle between the standard guide beam segment 1 and the upturned guide beam segment 2 is variable.

[0043] Both sides of the standard guide beam segment 1 and the guide beam lifting segment 2 are provided with grooves for cooperating with the support rollers 310 on the inner side of the standard bridge segment 3, so that the guide beam structure can slide within the standard bridge segment 3.

[0044] The top of the guide beam lifting segment 2 is shorter than the bottom. When the distance between the two connection points of the angle adjustment mechanism is equal to the difference in length between the top and bottom of the guide beam lifting segment 2, the end face of the guide beam standard segment 1 connected to the rear end face of the guide beam lifting segment 2 is perpendicular to the bottom face of the guide beam lifting segment 2. That is, the guide beam standard segment 1 and the guide beam lifting segment 2 are located on the same horizontal line with an included angle of 0°. Disconnect the front end of the angle adjustment mechanism from the top of the rear end face of the guide beam lifting segment 2, and lift the standard segment 1 of the guide beam (rotate upwards with the hinge point at the bottom of the rear end face of the standard segment 1 and the lifting segment 2 as the fulcrum), so that the angle between the standard segment 1 and the lifting segment is a°, and the distance between the top of the end face of the standard segment 1 and the top of the rear end face of the lifting segment 2 changes. Reconnect the front end of the angle adjustment mechanism to the top of the rear end face of the lifting segment 2, and finally the standard segment 1 and the lifting segment 2 are relatively fixed, maintaining an angle of a°, and the lifting action is completed.

[0045] like Figure 1 As shown, in this embodiment, the standard segment 1 of the guide beam includes a rectangular plate 102, a crossbeam 103, and a longitudinal beam I 101. Two parallel rectangular plates 102 are fixedly connected by crossbeams 103 evenly distributed along their length. Both ends of the rectangular plate 102 are provided with crossbeams 103. The crossbeams 103 at both ends close the two ends of the standard segment 1 of the guide beam, and their outer end faces serve as the front and rear end faces of the standard segment 1 of the guide beam, respectively. The longitudinal beam I 101 is the same length as the rectangular plate 102. Four longitudinal beams I 101 are fixed to the bottom and top of the opposite sides of the two rectangular plates 102, respectively. The longitudinal beams I 101 are aligned with the edges of the rectangular plate 102. The space between the rectangular plate 102 and the two longitudinal beams I 101 fixed thereon forms a groove.

[0046] like Figure 3 As shown, the guide beam lifting segment 2 includes a trapezoidal plate 203, longitudinal beam II 204, front end plate 206, rear end plate 205, and double-ear connector I 202. Two parallel trapezoidal plates 203 are fixedly connected by the front end plate 205 and the rear end plate 206. Two longitudinal beams II 204, which are of equal length to the long side of the trapezoidal plate 203, are respectively fixed to the bottom of the opposite sides of the two trapezoidal plates 203, with the bottom edge of the longitudinal beam II 204 aligned with the bottom edge of the trapezoidal plate 203. Two double-ear connectors I 202, which are of equal length to the short side of the trapezoidal plate 203, are respectively fixed to the top of the opposite sides of the two trapezoidal plates 203. The opening of the double-ear connector I 202 faces the rear end plate 205, and the top edge of the double-ear connector I 202 is aligned with the top edge of the trapezoidal plate 203. The center line of the connecting hole of the double-ear connector I 202 is perpendicular to the trapezoidal plate 203. The space between the trapezoidal plate 203 and the double-ear connector I 202 and longitudinal beam II 204 fixed thereon forms a groove.

[0047] The trapezoidal plate 203 can be integrally formed from a short rectangular plate, a right-angled trapezoidal plate, and a long rectangular plate. The short rectangular plate and the right-angled trapezoidal plate have the same short side length, and the long rectangular plate and the right-angled trapezoidal plate have the same long side length. The double-ear joint I 202 is fixed on the short rectangular plate, the longitudinal beam II 204 is fixed on the long rectangular plate, and the rear end plate 205 is a folded edge plate corresponding to the rear end face.

[0048] The rectangular plate 102, trapezoidal plate 203, crossbeam 103, longitudinal beam I 101, longitudinal beam II 204, rear end plate 205, and front end plate 206 can all be made of high-strength thin steel through shearing or forming. Crossbeam 103 and longitudinal beams I 101 and II 204 are formed by forming thin steel into a channel beam structure, i.e., all are open-sided columnar structures. The opening of crossbeam 103 faces the bottom, the opening of longitudinal beam I 101 faces the rectangular plate 102, and the opening of longitudinal beam II 204 faces the trapezoidal plate 203. The surfaces of crossbeam 103, rear end plate 205, and front end plate 206 can all be hollow. The high-strength thin steel standard segment 1 and the guide beam upturned segment 2 have high stiffness, are lightweight, have good torsional and bending resistance, and high structural stability. The flush lower edge and flat groove edge of the assembled guide beam structure ensure smooth movement of the guide beam structure within the bridge standard segment 3.

[0049] As an improvement, such as Figure 1 , 3 As shown, the connector assembly includes two double-ear connectors Ⅲ104 and two single-ear connectors Ⅲ105; the two double-ear connectors Ⅲ104 on both ends of the standard segment 1 of the guide beam are respectively fixed on two diagonally opposite longitudinal beams Ⅰ101, and the two single-ear connectors Ⅲ105 are respectively fixed on two other longitudinal beams Ⅰ101; the two double-ear connectors Ⅲ104 on the front end of the lifting segment 2 of the guide beam are respectively fixed on the diagonally opposite longitudinal beams Ⅱ204 and the closed end of double-ear connectors Ⅰ202, and the two single-ear connectors Ⅲ105 are respectively fixed on another longitudinal beam Ⅱ204 and the closed end of another double-ear connector Ⅰ202. On the rear end face of the guide beam lifting segment, the longitudinal beam II204, with a single-ear connector III105 fixed at the front end, is fixed with a double-ear connector II220 at the rear end. The longitudinal beam II204, with a double-ear connector III104 fixed at the front end, is fixed with a single-ear connector II210 at the rear end. Both double-ear connectors II220 and single-ear connectors II210 connect to the corresponding single-ear connectors III105 and double-ear connectors III104 on the connected standard guide beam segments. That is, the double-ear connector II220 on the rear end face of the guide beam lifting segment is located at the same position as the double-ear connectors III104 on both ends of the standard guide beam segment 1 and on the front end face of the guide beam lifting segment 2. The centerlines of the connecting holes of double-ear connector III104, single-ear connector III105, double-ear connector II220, and single-ear connector II210 are all parallel to the centerline of the connecting hole of double-ear connector I202.

[0050] As an improvement, the top of the rear end face of the guide beam lifting segment 2 is connected to the top of the end face of the connected guide beam standard segment 1 via two angle adjustment mechanisms. The two angle adjustment mechanisms are respectively connected to two double-eared connectors I202 on the rear end face of the guide beam lifting segment 2. Each of the two angle adjustment mechanisms has a single-eared connector I201 with several connecting holes at its front end. The distance between the connecting holes at different positions and the connection points at the rear end of the angle adjustment mechanism is different. The connecting holes at the same position on both angle adjustment mechanisms are detachably connected to the two double-eared connectors I202 at the top of the guide beam lifting segment 2 via pins 230. On the same side as the longitudinal beam II204 with single-eared connectors II210, the rear end of the angle adjustment mechanism has a double-eared connector II220, and on the same side as the longitudinal beam II204 with double-eared connectors II220, the rear end of the angle adjustment mechanism has a single-eared connector II210. The double-eared connectors II220 and the single-eared connectors II210 are respectively connected to the single-eared connectors III105 and double-eared connectors III104 at corresponding positions on the connected guide beam standard segment.

[0051] Among the several connection ports of the single-ear connector I201 of the angle adjustment mechanism, there is one connection hole A. The distance between A and the connection point at the rear end of the angle adjustment mechanism is L1. The distance between the center line of the connection hole of the double-ear connector I202 at the top of the guide beam lifting segment 2 and the front end face of the guide beam lifting segment 2 is L2. The distance between the hinge point at the bottom of the guide beam lifting segment 2 and the front end face of the guide beam lifting segment 2 is L3, where L1 + L2 = L3. When connection hole A is connected to the double-ear connector I202, the standard segment 1 of the guide beam and the lifting segment 2 of the guide beam are on the same horizontal line. By setting the number and position of the connection holes on the angle adjustment mechanism, the requirements for different lifting heights can be met.

[0052] In this embodiment, on the front face (viewed from front to back) of the standard guide beam segment 1, the double-eared connector III 104 is located at the upper left and lower right corners, and the single-eared connector III 105 is located at the upper right and lower left corners; similarly, on the rear face (viewed from back to front) of the standard guide beam segment 1, the double-eared connector III 104 is located at the upper left and lower right corners, and the single-eared connector III 105 is located at the upper right and lower left corners. The front and rear end faces of the standard guide beam segment 1 are orthogonal anisotropic connection joints, meaning that the standard guide beam segment 1 does not have a beginning and end segment distinction. During assembly, any end face of any standard guide beam segment 1 can be connected to each other without inspection or reversal adjustment, greatly improving work efficiency and further meeting the requirements of confined working spaces. At the same time, the connector assembly layout of the front face of the guide beam lifting segment 2 is completely consistent with that of the end face of the standard guide beam segment 1, and the front face of the guide beam lifting segment 2 can be connected to any end face of any standard guide beam segment 1. The lower left corner of the rear end face of the guide beam lifting segment 2 (viewed from back to front) is a single-ear connector II 210, and the lower right corner is a double-ear connector II 220. The rear end of the angle adjustment mechanism above the single-ear connector II 210 is a double-ear connector II 220, and the rear end of the angle adjustment mechanism above the double-ear connector II 220 is a single-ear connector II 210, ensuring that it can be connected to any end face of the guide beam standard segment 1.

[0053] As a further improvement, such as Figure 2 As shown, the locking assembly includes a rack and pin 110, a guide seat 120, and a pin-shifting mechanism 130. The guide seat 120 is a tubular structure with an axial through hole, and the tube wall has an opening that engages with the pin-shifting mechanism 130. The rack and pin 110 is inserted into the through hole, and one end of the rack and pin 110 has a rack 114 that engages with the teeth of the pin-shifting mechanism 130. Two guide seats 120 are fixed to one side of the two end faces of the standard section 1 of the guide beam and one side of the front end face of the upturned section 2 of the guide beam. The through holes of the guide seats 120 engage with the connecting holes of the double-ear connector III 104 and the single-ear connector III 105 on the same side, respectively. When connecting the components, the four rack and pin 110 are inserted into the through holes of the guide seats 120 from the connecting holes of the double-ear connector III 104 and the single-ear connector III 105, respectively, and the rack 114 engages with the pin-shifting mechanism 130. The rear ends of the two angle adjustment mechanisms are connected to the single-ear connector II 210 and double-ear connector II 220 at the bottom of the rear end face of the guide beam lifting segment 2, and the double-ear connector III 104 and single-ear connector III 105 on the side where the guide seat of the standard segment 1 of the guide beam is located, respectively, by inserting two rack pins into the through holes of the guide seat, and are connected by the engagement of the rack and gear; the rear ends of the two angle adjustment mechanisms are connected to the single-ear connector II 210 and double-ear connector II 220 at the bottom of the rear end face of the guide beam lifting segment 2, and the double-ear connector III 104 and single-ear connector III 105 on the side of the standard segment 1 of the guide beam where the guide seat is not fixed, by pin I 240.

[0054] In this embodiment, the rack and pin 110 is assembled from the pin body 111, the baffle 112, and the screw 113. A rack 114 is machined at the mid-diameter of a section of the axial length of the pin body 111. The guide seat 120 is welded from the guide sleeve 121 and the fixing plate 122. The fixing plate 122 is welded and fixed to both ends of the standard section 1 of the guide beam or the front end of the upturned section 2 of the guide beam. The guide sleeve 121 has an opening in the radial direction along a section of the axial length, which cooperates with the pin-shifting mechanism 130. The pin-shifting mechanism 130 is composed of a gear lever 131, a clamp seat 132, a clamp 133, and a screw 134. Two gears are fixed at the upper and lower ends of the gear lever 131. The middle section of the gear lever (between the two gears) is an optical shaft, which is fixed to the clamp 133 through the clamp seat 132 and assembled on the gear lever 131 through the screw 134. The clamp seat 132 is welded to both ends of the standard section 1 of the guide beam or the front end of the upturned section 2 of the guide beam. The pin mechanism 130 is vertically assembled, with two gears engaging with the openings of two guide sleeves 121 respectively. The pin mechanism 130 simultaneously controls the pull-out and insertion of two rack pins 110.

[0055] This invention provides a method for assembling and erecting nested modular guide beams, employing the nested modular guide beam structure described above, with the following steps:

[0056] S1: As Figure 4As shown, a single guide beam standard segment 1 is inserted into a single bridge standard segment 3. The groove of the guide beam standard segment 1 cooperates with the support roller 310 on the inner side of the bridge standard segment 3, forming a combined structure with the bridge standard segment 3. A fixing pin 310 is inserted into the crossbeam of the guide beam standard segment 1 from the top of the bridge standard segment 3, thus limiting the guide beam standard segment 1 within the bridge standard segment 3. Several combined structures are transported to the construction site for assembly. Inserting the guide beam standard segment 1 into the bridge standard segment 3 reduces the transport volume of the bridge structure, lowers the length requirements of the bridge erection site, and facilitates on-site assembly and erection.

[0057] S2: Rollers 4 are set up on the bank at the construction site. The assembly is placed on the rollers 4. When splicing any two assemblies, the connecting components are first connected using locking components to complete the assembly between the standard segments 1 of the guide beam, and then the two standard bridge segments 3 are connected. In this embodiment, any end of the standard segments 1 of the guide beam of any two assemblies is placed opposite each other. The double-eared joints Ⅲ104 and single-eared joints Ⅲ105 on the end faces of the two standard segments 1 of the guide beam cooperate with each other. The four rack pins 110 are inserted into the through holes of the guide seat 120 from the connecting holes of the double-eared joints Ⅲ104 and the single-eared joints Ⅲ105, respectively. The rack 114 engages with the gear to complete the connection of the two standard segments 1 of the guide beam.

[0058] S3: As Figure 5 As shown, when assembling the composite body with the rear end face of the guide beam lifting segment 2, the bottom of the rear end face of the guide beam lifting segment 2 is hinged to the bottom of any end face of the guide beam standard segment 1. The top of the rear end face of the guide beam lifting segment 2 and the top of the end face of the guide beam standard segment 1 are connected by the angle adjustment mechanism, so that the guide beam lifting segment 2 and the guide beam standard segment 1 are on the same straight line. The connection on the composite body is released (the fixing pin 301 is pulled out), and the guide beam lifting segment 2 is pushed into the bridge standard segment 3. Then, the next composite body is assembled with the front end face of the guide beam lifting segment 2. First, the locking component is used to connect the connecting components on the end face of the guide beam standard segment 1 and the front end face of the guide beam lifting segment 2, and then the two bridge standard segments 3 are connected.

[0059] In this embodiment, the single-ear connector I201 connection hole A at the front end of the two angle adjustment mechanisms is connected to the two double-ear connectors I202 at the top of the rear end face of the guide beam lifting segment 2 via pins 230; the single-ear connectors II210 and double-ear connectors II220 at the rear end of the two angle adjustment mechanisms and at the bottom of the rear end face of the guide beam lifting segment 2 are connected to the double-ear connectors III104 and single-ear connectors III105 of the guide beam standard segment 1. The connection holes of the double-ear connectors III104 and single-ear connectors III105 on the side where the guide seat of the guide beam standard segment 1 is located are respectively inserted into the through holes of the guide seat 120 via two rack pins 110, and the connection is achieved by the rack 114 engaging with the gear; the connection holes of the double-ear connectors III104 and single-ear connectors III105 on the other side of the guide beam standard segment 1 are respectively connected via pins I240, thus completing the assembly of the rear end face of the guide beam lifting segment 2 with the guide beam standard segment 1.

[0060] S4: As Figure 6 As shown, after several components are assembled one by one to reach the required bridge length, several standard guide beam segments 1 and one guide beam lifting segment 2 are assembled into a single unit to form the guide beam structure. Several standard bridge sections are then assembled into a single unit to form the bridge structure. The guide beam structure can be pushed out of the bridge structure by support rollers 310 until the lifting segment 2 is pushed out. Depending on the different bridge lengths and lifting height requirements, the lifting segment 2 can be inserted between different numbers of standard guide beam segments 1, meaning that the right side of the lifting segment 2 can be several standard guide beam segments 1.

[0061] S5: As Figure 7 , 8 As shown, disconnect the front end of the angle adjustment mechanism from the top of the guide beam lifting segment 2 (pull out the pin 230); lift the standard segment 1 of the guide beam connected to the rear end face of the guide beam lifting segment 2, change its angle with the guide beam lifting segment 2, select a suitable distance for the single-ear connector I201 connection hole, and reconnect the front end of the angle adjustment mechanism to the top of the guide beam lifting segment 2 (re-insert the pin 230), so that the standard segment 1 of the guide beam and the guide beam lifting segment 2 are finally fixed at an angle.

[0062] S6: As Figure 9 As shown, the guide beam structure continues to extend until two-thirds of the guide beam structure extends out of the bridge structure as a cantilever section. The fixing pin 301 is then reinserted into the remaining one-third of the guide beam structure to confine it within the bridge structure. The guide beam structure and the bridge structure are then pushed to the opposite bank as a whole under the support of the roller 4. The front end of the guide beam structure reaches the opposite bank and is placed on the roller 4.

[0063] S7: Continue pushing the overall structure until the bridge structure is safely pushed to the bridge position; the overall rigidity of the guide beam structure is high, meeting the large force requirements of the nested consolidation; the nested modular guide beam structure is lightweight and can prevent the bridge cantilever from tilting longitudinally. Disconnect the front end of the angle adjustment mechanism from the top of the guide beam lifting segment 2 (pull out the pin 230), and lay the guide beam standard segment 1, which is connected to the rear end of the guide beam lifting segment 2, flatten it so that the guide beam lifting segment 2 and the guide beam standard segment 1 are on the same straight line. At the same time, select the connection hole A of the single-ear connector I201 of the angle adjustment mechanism and reconnect the front end of the angle adjustment mechanism to the top of the guide beam lifting segment 2 (re-insert the pin 230); pull out the fixing pin 301 and push the guide beam structure back into the bridge structure.

[0064] S8: Insert fixing pins 301 to fix the guide beam structure to the bridge structure to form the main body of the bridge; finally, assemble the two ends of the bridge to complete the erection.

[0065] In specific implementation, when constructing a small-span bridge, for example when the span between the two banks is less than three times the length of the combined structure, after the front end of the guide beam structure reaches the roller 4 on the opposite bank, the following steps can replace S7 above: disconnect the front end of the angle adjustment mechanism from the top of the guide beam lifting segment 2 (pull out the pin 230), lay the standard segment 1 of the guide beam connected to the rear end face of the guide beam lifting segment 2 flat, and reconnect the front end of the angle adjustment mechanism to the top of the guide beam lifting segment 2 (the single-ear connector I201 connection hole A of the front end of the two angle adjustment mechanisms respectively connects with the two double-ear connectors I202 at the top of the rear end face of the guide beam lifting segment 2), so that the guide beam lifting segment and the standard segment 1 of the guide beam are on the same straight line; fix the front end of the guide beam structure on the opposite bank, and push the bridge structure under the support of the support roller 310 until the bridge structure is safely pushed to the bridge position.

[0066] The guide beam in this invention is a single guide beam structure, which is compact and lightweight, and can be assembled in confined spaces. The box girder structure has high rigidity, light weight, good torsional and bending resistance, and good structural stability. The number of components is small, the guide beam lifting structure is simple and labor-saving, the structure has a high degree of modularity, and has good connection performance, interchangeability and adaptability. The erection method is simple and quick, which can effectively improve the bridge erection speed. It solves the technical problem of assembling guide beams in confined spaces for new prefabricated highway steel bridges, while reducing the length requirements of the erection site.

[0067] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A nested modular guide beam structure, characterized in that, The guide beam structure is composed of several standard guide beam segments and a guide beam lifting segment connected end to end, with both ends of the guide beam structure being standard guide beam segments; The standard guide beam segment is a box girder structure with both ends closed and both end faces perpendicular to the bottom surface; the guide beam upturned segment, which is at the same height as the standard guide beam segment, is also a box girder structure with both ends closed and its top shorter than its bottom, with the front end face of the guide beam upturned segment perpendicular to the bottom surface; both end faces of the standard guide beam segment and the front end face of the guide beam upturned segment are fixed with the same joint assembly, and any interlocking joint assembly can be connected by a locking assembly; the bottom of the rear end face of the guide beam upturned segment is hinged to the bottom of the end face of the connected standard guide beam segment, and the top of the rear end face of the guide beam upturned segment is connected to the top of the end face of the connected standard guide beam segment through an angle adjustment mechanism, and the included angle between the standard guide beam segment and the guide beam upturned segment is variable; Both sides of the standard segment and the rising segment of the guide beam are provided with grooves for cooperating with the support rollers on the inner side of the standard segment of the bridge, so that the guide beam structure can slide within the standard segment of the bridge.

2. The nested modular guide beam structure as described in claim 1, characterized in that, The standard segment of the guide beam includes a rectangular plate, a crossbeam, and a longitudinal beam I. Two parallel rectangular plates are fixed together by crossbeams evenly distributed along their length, and both ends of the rectangular plates are provided with crossbeams. The longitudinal beam I is the same length as the rectangular plate, and four longitudinal beams I are fixed to the bottom and top of the opposite sides of the two rectangular plates respectively. The longitudinal beams I are aligned with the edges of the rectangular plates, and the space between the rectangular plate and the two longitudinal beams I fixed on it forms a groove. The guide beam lifting segment includes a trapezoidal plate, longitudinal beam II, front end plate, rear end plate, and double-ear joint I. Two parallel trapezoidal plates are fixedly connected by the front end plate and the rear end plate. Two longitudinal beams II, which are of equal length to the long side of the trapezoidal plates, are fixed to the bottom of the opposite sides of the two trapezoidal plates respectively, with the bottom edge of the longitudinal beam II aligned with the bottom edge of the trapezoidal plate. Two double-eared connectors I, each with the same length as the short side of the trapezoidal plate, are fixed to the top of the opposite sides of the two trapezoidal plates. The openings of the double-eared connectors I face the rear end plate, and the top edge of the double-eared connectors I is aligned with the top edge of the trapezoidal plate. The space between the trapezoidal plate and the double-eared connector I and the longitudinal beam II fixed on it forms a groove.

3. The nested modular guide beam structure as described in claim 2, characterized in that, The connector assembly includes two double-ear connectors III and two single-ear connectors III; the two double-ear connectors III on both ends of the standard section of the guide beam are respectively fixed on two diagonally opposite longitudinal beams I, and the two single-ear connectors III are respectively fixed on two other longitudinal beams I; the two double-ear connectors III on the front end of the guide beam lifting section are respectively fixed on the diagonally opposite longitudinal beam II and the closed end of the double-ear connector I, and the two single-ear connectors III are respectively fixed on another longitudinal beam II and the closed end of another double-ear connector I; On the rear end face of the guide beam lifting segment, the longitudinal beam II with a single-ear joint Ⅲ fixed at the front end is fixed with a double-ear joint Ⅱ at the rear end, and the longitudinal beam II with a double-ear joint Ⅲ fixed at the front end is fixed with a single-ear joint Ⅱ at the rear end. The double-ear joint Ⅱ and the single-ear joint Ⅱ are respectively connected to the single-ear joint Ⅲ and the double-ear joint Ⅲ at the corresponding positions of the connected guide beam standard segment.

4. The nested modular guide beam structure as described in claim 3, characterized in that, The top of the rear end face of the guide beam lifting segment is connected to the top of the end face of the connected guide beam standard segment through two angle adjustment mechanisms. The front end of each of the two angle adjustment mechanisms is provided with a single-ear connector I with several connection holes. The connection holes at the same position of the two angle adjustment mechanisms are respectively connected to the two double-ear connectors I at the top of the guide beam lifting segment through pins to achieve detachable connection. The rear end of the angle adjustment mechanism on the same side as the longitudinal beam II with single-ear connector II is provided with double-ear connector II, and the rear end of the angle adjustment mechanism on the same side as the longitudinal beam II with double-ear connector II is provided with single-ear connector II. The double-ear connector II and the single-ear connector II are respectively connected to the single-ear connector III and the double-ear connector III at the corresponding positions of the connected guide beam standard segment. Among the several connecting holes of the single-ear connector I of the angle adjustment mechanism, there is a connecting hole A. The distance between A and the connection point at the rear end of the angle adjustment mechanism is L1. The distance between the center line of the connecting hole of the double-ear connector I at the top of the guide beam lifting segment and the front end face of the guide beam lifting segment is L2. The distance between the hinge point at the bottom of the guide beam lifting segment and the front end face of the guide beam lifting segment is L3. L1+L2=L3. When connecting hole A is connected to the double-ear connector I, the standard segment of the guide beam and the lifting segment of the guide beam are on the same horizontal line.

5. The nested modular guide beam structure as described in claim 4, characterized in that, The locking assembly includes a rack and pin, a guide seat, and a pin mechanism. The guide seat is a tubular structure with an axial through hole and an opening in the tube wall to engage with the pin mechanism. The rack and pin engages with the through hole, and one end of the rack and pin has a rack that engages with the teeth of the pin mechanism. Two guide seats are fixed on one side of the standard section of the guide beam and the front end of the section of the guide beam. The through holes of the guide seats are respectively engaged with the double-ear connector III connection hole and the single-ear connector III connection hole on the same side. When connecting the components, the four rack pins are inserted into the through holes of the guide seats from the double-ear connector III connection hole and the single-ear connector III connection hole respectively, and the rack engages with the pin mechanism.

6. The nested modular guide beam structure as described in claim 4 or 5, characterized in that, The guide seat is equipped with a fixing plate, and the pin mechanism is equipped with a clamp seat; the fixing plate and the clamp seat are fixedly connected to the two ends of the standard section of the guide beam or the front end of the upturned section of the guide beam.

7. A method for assembling and erecting nested modular guide beams, characterized in that, The nested modular guide beam structure as described in claim 5 or 6 is adopted, and the steps are as follows: S1: A single guide beam standard segment is inserted into a single bridge standard segment. The groove of the guide beam standard segment cooperates with the support roller on the inner side of the bridge standard segment, and the guide beam standard segment and the bridge standard segment form a combined body. A fixing pin is inserted into the crossbeam of the guide beam standard segment from the top of the bridge standard segment, so that the guide beam standard segment is limited within the bridge standard segment. Several combined bodies are transported to the construction site for assembly. S2: Rollers are set up on the bank at the construction site. The assembly is placed on the rollers. When splicing any two assemblies, the locking components are used to connect the connecting components first to complete the assembly between the standard segments of the guide beam, and then the two standard segments of the bridge are connected. S3: When assembling the composite body with the rear end face of the guide beam lifting segment, hinge the bottom of the rear end face of the guide beam lifting segment to the bottom of the end face of any guide beam standard segment, and connect the top of the rear end face of the guide beam lifting segment and the top of the end face of the aforementioned guide beam standard segment through the angle adjustment mechanism, so that the guide beam lifting segment and the guide beam standard segment are on the same straight line. Release the fixing pin on the composite body and push the guide beam lifting segment into the bridge standard segment; Next, assemble the next assembly with the front end face of the guide beam lifting segment. First, use locking components to connect the end face of the guide beam standard segment and the connecting components on the front end face of the guide beam lifting segment of the assembly, and then connect the two bridge standard segments. S4: After several components are assembled one by one, several standard guide beam segments and one guide beam lifting segment are assembled into a guide beam structure, and several standard bridge sections are assembled into a bridge structure; the guide beam structure can be pushed out of the bridge structure by supporting rollers until the guide beam lifting segment is pushed out. S5: Disconnect the front end of the angle adjustment mechanism from the top of the guide beam lifting segment; lift the standard segment of the guide beam connected to the rear end of the guide beam lifting segment, change its angle with the guide beam lifting segment, reconnect the front end of the angle adjustment mechanism to the top of the guide beam lifting segment, and finally fix the beam standard segment and the guide beam lifting segment at a relatively fixed angle. S6: Continue pushing the guide beam structure out until two-thirds of the guide beam structure is pushed out of the bridge structure as a cantilever section, and the remaining one-third of the guide beam structure is limited within the bridge structure using fixed pins; push the guide beam structure and the bridge structure as a whole structure to the opposite bank with the support of rollers, and the front end of the guide beam structure reaches the opposite bank to set up rollers. S7: Continue pushing the overall structure until the bridge structure is safely pushed to the bridge position; release the connection between the front end of the angle adjustment mechanism and the top of the guide beam lifting segment, flatten the standard segment of the guide beam connected to the rear end of the guide beam lifting segment, so that the guide beam lifting segment and the standard segment of the guide beam are on the same straight line, and reconnect the front end of the angle adjustment mechanism to the top of the guide beam lifting segment; release the fixing pin and push the guide beam structure back into the bridge structure; S8: Use fixing pins to fix the guide beam structure to the bridge structure to form the main body of the bridge; finally, assemble the two ends of the bridge to complete the erection.

8. The nested modular guide beam assembly and erection method as described in claim 7, characterized in that, The splicing process of any two components in S2 is as follows: Place any end of the guide beam standard segment of any two components opposite each other, and the double-ear joint III and single-ear joint III on the end face of the two guide beam standard segments cooperate with each other. The four rack pins are inserted into the guide seat through hole from the double-ear joint III connection hole and the single-ear joint III connection hole respectively. The rack and gear engage to complete the connection of the two guide beam standard segments.

9. The nested modular guide beam assembly and erection method as described in claim 7, characterized in that, The assembly process of the combined body and the rear end face of the guide beam lifting segment in S3 is as follows: The single-ear connector I connecting hole A at the front end of the two angle adjustment mechanisms is connected to the two double-ear connectors I at the top of the rear end face of the guide beam lifting segment by means of pins; the single-ear connector II and double-ear connector II at the rear end of the two angle adjustment mechanisms and at the bottom of the rear end face of the guide beam lifting segment are matched with the double-ear connector III and single-ear connector III of the guide beam standard segment; the double-ear connector III and single-ear connector III on the side where the guide seat of the guide beam standard segment is located are respectively inserted into the through hole of the guide seat by two rack pins, and the connection is achieved by the rack and gear engaging; the double-ear connector III and single-ear connector III on the other side of the guide beam standard segment are respectively connected by pins.

10. The method for assembling and erecting nested modular guide beams as described in any one of claims 7-9, characterized in that, When the span between the two banks is less than three times the length of the combined structure, step S7 can be replaced by the following steps: Stop pushing the overall structure, disconnect the front end of the angle adjustment mechanism from the top of the guide beam lifting segment, flatten the standard segment of the guide beam connected to the rear end of the guide beam lifting segment, reconnect the front end of the angle adjustment mechanism to the top of the guide beam lifting segment, so that the guide beam lifting segment and the standard segment of the guide beam are on the same straight line; fix the front end of the guide beam structure to the opposite bank, and push the bridge structure with the support of the support rollers until the bridge structure is safely pushed to the bridge position.

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