A simple sightseeing platform added to an existing lower crossbeam and its construction method

Abstract

A simple sightseeing platform added to an existing lower crossbeam and its construction method provided by the present invention. The sightseeing platform includes a platform beam body, a glass panel arranged above the platform beam body, and a fixing seat for connecting the platform beam body to the existing lower crossbeam. The simple sightseeing platform provided by the present invention is added to an existing steel truss bridge, increasing the movable space for tourists to view the scenery on the bridge, enabling them to view the local scenery more comprehensively from different angles; moreover, the platform structure is simple and easy to install, and mechanized installation is not required during the construction process, and all installation processes can be completed manually; at the same time, the sightseeing platform is fixedly connected to the existing lower crossbeam through the fixing method combining the steel-bonding glue and the lower connecting bolts on the fixing seat, while achieving stable installation, minimizing the influence of the platform on the stress of relevant members of the steel truss bridge, ensuring both the structural safety of the platform and the personal safety of tourists, and facilitating later removal.

Description

Technical Field

[0001] The present invention relates to the field of bridge design, and particularly to an observation platform added to an existing lower cross beam and a construction method thereof. Background Art

[0002] A truss bridge refers to a bridge that uses a truss as the main load-bearing member of the upper structure. Generally, it consists of a main bridge truss, upper and lower horizontal longitudinal bracing systems, portal frames, intermediate cross bracing frames, and a deck system. In a truss, the chord members are the members that form the periphery of the truss, including the upper chord and the lower chord. The members connecting the upper and lower chords are called web members, and are further divided into diagonal members and vertical members according to the direction of the web members. The plane where the chord members and the web members are located is called the main truss plane. The bridge height of a long-span bridge truss changes along the span direction, forming a curved chord truss; for medium and small spans, a constant truss height is adopted, that is, the so-called flat chord truss or straight chord truss.

[0003] With the development of the tourism industry, some natural landscapes such as steep deep mountain valleys and large rivers have become popular tourist destinations. Due to the steep terrain in such places, steel truss bridges with high safety factors are mostly used as carriers for high-speed transportation or viewing channels for tourists. However, since there are many members erected above the steel truss bridge, the line of sight of tourists viewing the scenery on the bridge is usually blocked, thus affecting the sense of experience of the visit. Currently, people add simple observation platforms on the steel truss bridges in the above-mentioned places, so that tourists can have a larger space to view the scenery from various angles on the truss bridge. However, due to the complex mechanical structure of the observation platform, on-site construction is difficult and the installation is more difficult; and because the existing observation platforms are directly welded or bolted to the steel truss girder, factors such as welding shrinkage deformation or drilling after long-term use will cause uncontrollable risks to the steel truss girder.

[0004] In view of this, it is necessary to provide a simple observation platform added to an existing lower cross beam to solve the problems that the truss of the steel truss bridge blocks the line of sight of tourists and affects the sense of experience of the visit, and the existing observation platforms are difficult to construct due to their complex structures. Summary of the Invention

[0005] The main object of the present invention is to provide a simple observation platform added to an existing lower cross beam, aiming to solve the problems in the prior art that the truss of the steel truss bridge blocks the line of sight of tourists and affects the sense of experience of the visit, and the existing observation platforms are difficult to construct due to their complex structures.

[0006] To achieve the above object, the present invention provides a simple sightseeing platform added to an existing lower cross beam. The sightseeing platform is erected on the existing lower cross beam, and the existing lower cross beam is located between the truss beam and the pedestrian passage and connects the truss beam and the pedestrian passage; the sightseeing platform includes a platform beam body, a glass panel arranged above the platform beam body, and a fixing seat for connecting the platform beam body and the existing lower cross beam; wherein, the platform beam body includes at least two I-shaped longitudinal beams arranged along the bridge length direction, at least three I-shaped cross beams connected between the I-shaped longitudinal beams, and several I-shaped secondary cross beams;

[0007] At the position where each I-shaped cross beam correspondingly connects the I-shaped longitudinal beam, a fixing seat is fixedly installed; the fixing seat is fixedly connected to the I-shaped cross beam and the I-shaped longitudinal beam at the same time. Among them, the fixing seat includes a connecting piece, a bottom edge steel plate, and at least two pairs of lower connecting bolts; the connecting piece is connected between the I-shaped cross beam and the existing lower cross beam, and the connecting piece includes an upper connecting steel plate, a lower connecting steel plate, and a connecting part fixedly connecting the upper connecting steel plate and the lower connecting steel plate. The upper connecting steel plate is fixedly connected to the I-shaped cross beam and the I-shaped longitudinal beam, and the lower connecting steel plate and the bottom edge steel plate are clamped on the existing lower cross beam through the cooperation of the lower connecting bolts.

[0008] Preferably, the I-shaped longitudinal beam includes several longitudinal beam segments spliced end to end along the bridge length direction; each longitudinal beam segment includes a first upper flange plate, a first web plate, and a first lower flange plate. The two first upper flange plates of two adjacent longitudinal beam segments are fixedly welded in the bridge length direction, the two first web plates of two adjacent longitudinal beam segments are fixedly connected by bolts in the bridge length direction, and the two first lower flange plates of two adjacent longitudinal beam segments are fixedly connected by bolts in the bridge length direction.

[0009] Preferably, the I-shaped cross beam includes a second upper flange plate, a second web plate, and a second lower flange plate. The second upper flange plate and the I-shaped longitudinal beam are fixedly welded in the bridge width direction, the second lower flange plate and the I-shaped longitudinal beam are fixedly welded in the bridge width direction, and the second web plate and the I-shaped longitudinal beam are fixedly connected by bolts in the bridge width direction.

[0010] Preferably, the I-shaped secondary cross beam includes a third upper flange plate and a third web plate. The third upper flange plate and the I-shaped longitudinal beam are fixedly connected by welding in the bridge width direction, and the third web plate and the I-shaped longitudinal beam are fixedly connected by bolts in the bridge width direction.

[0011] Preferably, the glass panel is a double-layer tempered glass structure.

[0012] Preferably, the fixing seat further includes a leveling steel plate and a stiffening plate. The leveling steel plate is disposed between the upper connecting steel plate and the platform girder, and the stiffening plate is fixedly arranged on the side surface of the bottom edge steel plate away from the connecting member.

[0013] Preferably, the fixing seat further includes at least two pairs of upper connecting bolts. The upper connecting steel plate is fixedly connected to the I-shaped cross beam and the I-shaped longitudinal beam through the cooperation of the upper connecting bolts.

[0014] Preferably, bonding steel adhesives are coated on the opposite side surfaces of the lower connecting steel plate and the bottom edge steel plate.

[0015] The present invention also provides a construction method for a simple sightseeing platform added to an existing lower cross beam. The construction steps of the simple sightseeing platform added to the existing lower cross beam are as follows:

[0016] (1) Assemble at least two of the I-shaped longitudinal beams and determine the dimensions of the I-shaped longitudinal beams.

[0017] (2) According to the dimensions of the I-shaped longitudinal beams in the bridge length direction, determine the connection positions of each I-shaped cross beam, and fixedly install the fixing seat at the connection positions of the I-shaped longitudinal beam and the I-shaped cross beam on the existing lower cross beam. The installation of the fixing seat includes the following steps:

[0018] First, initially clamp the fixing seat on the existing lower cross beam through the bonding steel adhesives on the opposite side surfaces of the lower connecting steel plate and the bottom edge steel plate. Then, by tightening the lower connecting bolts, fixedly clamp the lower connecting steel plate and the bottom edge steel plate on the existing lower cross beam.

[0019] (3) Assemble the I-shaped cross beam, connect the I-shaped longitudinal beam with the I-shaped cross beam, and fixedly connect the I-shaped longitudinal beam and the I-shaped cross beam to the corresponding upper connecting steel plate through the upper connecting bolts, so as to fixedly connect the I-shaped longitudinal beam and the I-shaped cross beam to the existing lower cross beam.

[0020] (4) Assemble the I-shaped secondary cross beam and fixedly connect the I-shaped secondary cross beam to the I-shaped longitudinal beam.

[0021] (5) Fix and lay the glass panel on the platform girder.

[0022] Compared with the prior art, the simple sightseeing platform added to an existing lower cross beam and its construction method provided by the present invention have the following beneficial effects:

[0023] First, the sightseeing platform is added to the existing steel truss bridge, increasing the movable space for tourists to view the scenery on the bridge, enabling them to view the local scenery more comprehensively from different angles and enhancing the tourists' viewing experience of the local scenery;

[0024] Second, the platform has a simple structure, light weight, and simple construction method, which is convenient for installation. During the construction process, mechanized installation is not required, and all installation procedures can be completed manually;

[0025] Third, during the installation process, a fixed seat is used to connect the platform to the existing lower cross beam of the steel truss bridge, and it is fixedly connected to the existing lower cross beam through structural adhesive, minimizing the influence on the stress of the relevant members of the truss bridge. Moreover, a double connection method combining structural adhesive fixation and bolt fixation is used to fix the fixed seat on the existing lower cross beam, ensuring both structural safety and facilitating later demolition. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0027] Figure 1 It is a top view of a simple sightseeing platform added to the existing lower cross beam of the present invention;

[0028] Figure 2 It is a bottom view of a simple sightseeing platform added to the existing lower cross beam of the present invention;

[0029] Figure 3 It is an A-A cross-sectional view of a simple sightseeing platform added to the existing lower cross beam of the present invention;

[0030] Figure 4 It is a B-B cross-sectional view of a simple sightseeing platform added to the existing lower cross beam of the present invention.

[0031] EXPLANATION OF THE REFERENCE NUMERALS IN THE DRAWINGS:

[0032]

[0033]

[0034] The realization of the object, functional features, and advantages of the present invention will be further described in conjunction with the embodiments with reference to the drawings. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0035] Next, in combination with the accompanying drawings in the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0036] It should be noted that all directional indications (such as up, down...) in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If this specific posture changes, the directional indications will also change accordingly.

[0037] In addition, in the present invention, descriptions such as "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features.

[0038] Moreover, the technical solutions between various embodiments of the present invention can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0039] As Figures 1-4 shown, the present invention provides a simple sightseeing platform added to an existing lower cross beam. The sightseeing platform (not marked in the figure) is erected on the existing lower cross beam 100. The existing lower cross beam 100 is located between the truss beam (not marked in the figure) and the pedestrian passage 200, and connects the truss beam and the pedestrian passage 200. The sightseeing platform includes a platform beam body 300, a glass panel 400 arranged above the platform beam body 300, and a fixing seat 500 for connecting the platform beam body 300 and the existing lower cross beam 100. Among them, the platform beam body 300 includes at least two I-shaped longitudinal beams 310 arranged along the bridge length direction, at least three I-shaped cross beams 320 connected between the I-shaped longitudinal beams 310, and several I-shaped secondary cross beams 330.

[0040] At least two I-shaped secondary cross beams 330 connect two adjacent I-shaped longitudinal beams 310 and are evenly arranged between the two adjacent I-shaped longitudinal beams 310.

[0041] A fixing seat 500 is fixedly installed at the position where each I-shaped cross beam 320 corresponds to and connects with the I-shaped longitudinal beam 310. The fixing seat 500 is fixedly connected to both the I-shaped cross beam 320 and the I-shaped longitudinal beam 310. Among them;

[0042] The fixed seat 500 includes a connecting member 510, a bottom edge steel plate 520, and at least two pairs of lower connecting bolts 530; the connecting member 510 is connected between the I-shaped cross beam 320 and the existing lower cross beam 100. The connecting member 510 includes an upper connecting steel plate 511, a lower connecting steel plate 512, and a connecting portion 513 fixedly connecting the upper connecting steel plate 511 and the lower connecting steel plate 512. The upper connecting steel plate 511 is fixedly connected to the I-shaped cross beam 320 and the I-shaped longitudinal beam 310. The lower connecting steel plate 512 and the bottom edge steel plate 520 are clamped on the existing lower cross beam 100 through the cooperation of the lower connecting bolts 530.

[0043] In this application, the simple sightseeing platform is added on the existing lower cross beam 100. The platform beam body 300 is erected on the existing lower cross beam 100 through the fixed seat 500. A transparent glass panel 400 is fixedly arranged above the platform beam body 300 to form a passage for tourists to walk on, so that tourists have a larger movable space and a better viewing field of vision. At the same time, each part of the sightseeing platform is a detachable structure, which is convenient for transportation and installation, and makes the maintenance and replacement of subsequent components more convenient. Moreover, the sightseeing platform erected on the existing lower cross beam 100 not only saves resources but also has a good support structure, with higher safety performance.

[0044] Furthermore, the I-shaped longitudinal beam 310 includes a number of longitudinal beam segments (not marked in the figure) spliced end to end along the bridge length direction; each longitudinal beam segment includes a first upper flange plate (not marked in the figure), a first web plate (not marked in the figure), and a first lower flange plate (not marked in the figure). The two first upper flange plates of two adjacent longitudinal beam segments are fixedly welded in the bridge length direction. The two first web plates of two adjacent longitudinal beam segments are fixedly connected by bolts in the bridge length direction. The two first lower flange plates of two adjacent longitudinal beam segments are fixedly connected by bolts in the bridge length direction. Specifically, when installing the sightseeing platform, first transport the first upper flange plate, the first web plate, and the first lower flange plate of each longitudinal beam segment to a specific location, and then perform the overall assembly of the I-shaped longitudinal beam 310, so as to save the transportation difficulties caused by the volume problem during the transportation of the longitudinal beam. At the same time, in order to reduce the welding workload on site, the two first web plates in two adjacent longitudinal beam segments are connected by bolts in the bridge length direction, and the two first lower flange plates in two adjacent longitudinal beam segments are also connected by bolts in the bridge length direction. However, in order to ensure the flatness of the top surface of the I-shaped longitudinal beam, the connection of the two first upper flange plates in two adjacent longitudinal beam segments in the bridge length direction is welded and fixed. As a specific embodiment, since the splicing part of each longitudinal beam segment is not as strong as the middle part of the longitudinal beam segment, when segmenting the I-shaped longitudinal beam 310, attention should be paid to avoiding the unfavorable stress positions of the longitudinal beam to improve the service life of the sightseeing platform.

[0045] Further, the I-shaped cross beam 320 includes a second upper flange plate (not labeled in the figure), a second web plate (not labeled in the figure), and a second lower flange plate (not labeled in the figure). The second upper flange plate and the I-shaped longitudinal beam 310 are fixedly welded in the bridge width direction. The second lower flange plate and the I-shaped longitudinal beam 310 are fixedly welded in the bridge width direction. The second web plate and the I-shaped longitudinal beam 310 are fixedly connected by bolts in the bridge width direction. Specifically, the second upper flange plate is fixedly connected to the first upper flange plate of the I-shaped longitudinal beam 310. The second lower flange plate is fixedly connected to the first lower flange plate of the I-shaped longitudinal beam 310. The second web plate is fixedly connected to the first web plate of the I-shaped longitudinal beam 310.

[0046] Further, the I-shaped secondary cross beam 330 includes a third upper flange plate (not labeled in the figure) and a third web plate (not labeled in the figure). The third upper flange plate and the I-shaped longitudinal beam 310 are fixedly welded in the bridge width direction. The third web plate and the I-shaped longitudinal beam 310 are fixedly connected by bolts in the bridge width direction. Specifically, the third upper flange plate is fixedly connected to the first upper flange plate of the I-shaped longitudinal beam 310. The third web plate is fixedly connected to the first web plate of the I-shaped longitudinal beam 310.

[0047] Further, the glass panel 400 has a double-layer tempered glass structure. Specifically, tempered glass is a kind of prestressed glass. To improve the strength of the glass, chemical or physical methods are usually used to form compressive stress on the glass surface. When the glass bears external force, the surface stress is offset first, thereby improving the bearing capacity, enhancing the wind resistance, cold and heat resistance, impact resistance, etc. of the glass itself; its strength is several times higher than that of ordinary glass, and it has good bending resistance. Its bearing capacity greatly improves the fragile nature of the glass. Its resistance to sudden cooling and sudden heating has increased by 3 to 5 times compared with ordinary glass. Generally, it can withstand temperature differences of more than 250 degrees, and it has an obvious effect on preventing thermal cracking.

[0048] Further, the fixing seat 500 further includes a leveling steel plate 540 and a stiffening plate 550. The leveling steel plate 540 is padded between the upper connecting steel plate 511 and the platform beam body 300. The stiffening plate 550 is fixedly arranged on the side of the bottom edge steel plate 520 away from the connecting piece 510. Specifically, the leveling steel plate 540 is padded between the upper connecting steel plate 511 and the platform beam body 300, so that the platform beam body 300 is flatly connected to the existing lower cross beam 100. The stiffening plate 550 is arranged on the side of the bottom edge steel plate 520 away from the connecting piece 510 to play a certain strengthening role on the bottom edge steel plate 520. As a specific embodiment, the stiffening plate 550 and the bottom edge steel plate 520 are fixedly welded, and the stiffening plate 550 and the bottom edge steel plate 520 are in a T-shaped structure in the bridge length direction.

[0049] Further, the fixing base 500 further includes at least two pairs of upper connecting bolts 560. The upper connecting steel plate 511 is fixedly connected to the I-shaped cross beam 320 and the I-shaped longitudinal beam 310 through the cooperation of the upper connecting bolts 560. As a specific embodiment, the connection between the upper connecting steel plate 511 of the fixing base 500 and the I-shaped cross beam 320 and the I-shaped longitudinal beam 310 includes, but is not limited to, bolt connection. For example, welding, rivet connection, etc. can also be used.

[0050] Preferably, bonding adhesives 570 are coated on the opposite two side surfaces of the lower connecting steel plate 512 and the bottom edge steel plate 520. Specifically, the bonding adhesives 570 can clamp the lower connecting steel plate 512 and the bottom edge steel plate 520 to the existing lower cross beam 100 before the lower connecting bolts 530 lock the lower connecting steel plate 512 and the bottom edge steel plate 520, so as to play a role in basic fixing for the subsequent installation of the platform. Those skilled in the art should know that the bonding adhesives 570 are special building structure adhesives, which have super strong adhesion, strong shear force, anti-aging, good resistance to media (acid, alkali, water), strong impact resistance, room temperature curing, small shrinkage during the hardening process, no flow during construction, no volatile solvents, non-toxic and convenient construction, etc. They can be constructed within a relatively wide temperature range, without precipitation, and are almost applicable to all building substrates, and are specifically used for the bonding between steel plates.

[0051] The present invention also provides a construction method for a simple sightseeing platform added to an existing lower cross beam. The construction steps of the simple sightseeing platform added to the existing lower cross beam 100 are as follows:

[0052] (1) Assemble at least two I-shaped longitudinal beams 310 and determine the dimensions of the I-shaped longitudinal beams 310;

[0053] (2) According to the dimensions of the I-shaped longitudinal beams 310 in the bridge length direction, determine the connection positions of each I-shaped cross beam 320, and fixedly install the fixing base 500 at the connection positions of the I-shaped longitudinal beams 310 and the I-shaped cross beams 320 on the existing lower cross beam 100. The installation of the fixing base 500 includes the following steps:

[0054] First, preliminarily clamp the fixing base 500 on the existing lower cross beam 100 through the bonding adhesives 570 on the opposite two side surfaces of the lower connecting steel plate 512 and the bottom edge steel plate 520, and then, by tightening the lower connecting bolts 530, fixedly clamp the lower connecting steel plate 512 and the bottom edge steel plate 520 on the existing lower cross beam 100;

[0055] (3), Assemble the I-shaped cross beam 320, connect the I-shaped longitudinal beam 310 with the I-shaped cross beam 320, and at the same time, fixedly connect the I-shaped longitudinal beam 310 and the I-shaped cross beam 320 to the corresponding upper connecting steel plate 511 through connection methods such as upper connecting bolts 560, so that the I-shaped longitudinal beam 310 and the I-shaped cross beam 320 are fixedly connected to the existing lower cross beam 100;

[0056] (4), Assemble the I-shaped secondary cross beam 330, and fixedly connect the I-shaped secondary cross beam 330 with the I-shaped longitudinal beam 310;

[0057] (5), Fix and lay the glass panel 400 on the platform beam body 300.

[0058] In the above technical solution of the present invention, the above is only the preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structural transformation made by using the description and drawings of the present invention under the technical concept of the present invention, or direct / indirect application in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A simple sightseeing platform added to an existing lower cross beam, characterized in that, The sightseeing platform is erected on the existing lower cross beam, which is located between the truss beam and the pedestrian passage and connects the truss beam and the pedestrian passage; the sightseeing platform includes a platform beam body, a glass panel arranged above the platform beam body, and a fixing seat for connecting the platform beam body and the existing lower cross beam; wherein, the platform beam body includes at least two I-shaped longitudinal beams arranged along the bridge length direction, at least three I-shaped cross beams connected between the I-shaped longitudinal beams, and several I-shaped secondary cross beams; At least two of the I-shaped secondary cross beams connect two adjacent I-shaped longitudinal beams and are evenly arranged between two adjacent I-shaped cross beams; One fixing seat is fixedly installed at the position where each I-shaped cross beam correspondingly connects to the I-shaped longitudinal beam; The fixing seat is fixedly connected to the I-shaped cross beam and the I-shaped longitudinal beam at the same time. Among them, the fixing seat includes a connecting piece, a bottom edge steel plate, and at least two pairs of lower connecting bolts; the connecting piece is connected between the I-shaped cross beam and the existing lower cross beam, and the connecting piece includes an upper connecting steel plate, a lower connecting steel plate, and a connecting part fixedly connecting the upper connecting steel plate and the lower connecting steel plate. The upper connecting steel plate is fixedly connected to the I-shaped cross beam and the I-shaped longitudinal beam, and the lower connecting steel plate and the bottom edge steel plate are clamped on the existing lower cross beam through the cooperation of the lower connecting bolts; The glass panel is of a double-layer toughened glass structure; The opposite side surfaces of the lower connecting steel plate and the bottom edge steel plate are both coated with bonding steel adhesive.

2. The simple sightseeing platform added to the existing lower cross beam according to claim 1, characterized in that, The I-shaped longitudinal beam includes several longitudinal beam segments spliced end to end along the bridge length direction; each longitudinal beam segment includes a first upper flange plate, a first web plate, and a first lower flange plate. The two first upper flange plates of two adjacent longitudinal beam segments are fixedly welded in the bridge length direction, the two first web plates of two adjacent longitudinal beam segments are fixedly connected by bolts in the bridge length direction, and the two first lower flange plates of two adjacent longitudinal beam segments are fixedly connected by bolts in the bridge length direction.

3. The simple sightseeing platform added to the existing lower cross beam according to claim 1, characterized in that, The I-shaped cross beam includes a second upper flange plate, a second web plate, and a second lower flange plate. The second upper flange plate is welded and fixed to the I-shaped longitudinal beam in the bridge width direction, the second lower flange plate is welded and fixed to the I-shaped longitudinal beam in the bridge width direction, and the second web plate is fixedly connected to the I-shaped longitudinal beam by bolts in the bridge width direction.

4. The simple sightseeing platform added to an existing lower cross beam according to claim 1, characterized in that, The I-shaped secondary cross beam includes a third upper flange plate and a third web plate. The third upper flange plate is welded and fixed to the I-shaped longitudinal beam in the bridge width direction, and the third web plate is fixedly connected to the I-shaped longitudinal beam by bolts in the bridge width direction.

5. A simple sightseeing platform added to an existing lower cross beam according to claim 1, characterized in that, The fixing seat further includes a leveling steel plate and a stiffening plate. The leveling steel plate is padded between the upper connecting steel plate and the platform beam body, and the stiffening plate is fixedly arranged on the side surface of the bottom edge steel plate away from the connecting piece.

6. The simple sightseeing platform added to the existing lower cross beam according to claim 1, characterized in that, The fixing seat further includes at least two pairs of upper connecting bolts. The upper connecting steel plate is fixedly connected to the I-shaped cross beam and the I-shaped longitudinal beam through the cooperation of the upper connecting bolts.

7. A construction method for a simple sightseeing platform added to an existing lower cross beam, characterized in that, The construction steps of the simple sightseeing platform added on the existing lower cross beam as described in claim 6 include: (1) Assembling at least two of the I-shaped longitudinal beams and determining the dimensions of the I-shaped longitudinal beams; (2) Determining the connection positions of each I-shaped cross beam according to the dimensions of the I-shaped longitudinal beams in the bridge length direction, and fixedly installing the fixing seats at the joints of the I-shaped longitudinal beams and the I-shaped cross beams on the existing lower cross beam. The installation of the fixing seats includes the following steps: First, preliminarily clamp the fixing seat on the existing lower cross beam through the bonding agent on the opposite side surfaces of the lower connecting steel plate and the bottom edge steel plate, and then, by tightening the lower connecting bolts, fixedly clamp the lower connecting steel plate and the bottom edge steel plate on the existing lower cross beam; (3) Assembling the I-shaped cross beams, connecting the I-shaped longitudinal beams and the I-shaped cross beams, and fixedly connecting the I-shaped longitudinal beams and the I-shaped cross beams to the corresponding upper connecting steel plates through the upper connecting bolts, so as to fixedly connect the I-shaped longitudinal beams and the I-shaped cross beams to the existing lower cross beam; (4) Assembling the I-shaped secondary cross beams and fixedly connecting the I-shaped secondary cross beams to the I-shaped longitudinal beams; (5) Fixing and laying the glass panels on the platform beam body.

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