CN221297563U - Light truss bridge with cooperative stress of pedestrian guardrails - Google Patents

Abstract

The utility model relates to a light truss bridge cooperatively stressed by a pedestrian guardrail, which comprises a railing part and a main truss part, wherein the main truss part comprises a first part and a second part, and the first part and the second part are connected through a lower web plate which is arranged in a triangle; the railing part is located at the top of the main truss part and comprises an upper chord member and an upper web member, wherein the upper chord member and the upper web member are arranged in a triangular truss form which is adaptive to the main truss part and are stressed cooperatively with the main truss part. Compared with the prior art, the utility model can further reduce the control beam height of the main truss, has high material utilization rate and is economical in manufacturing cost.

Description

Light truss bridge with cooperative stress of pedestrian guardrails

Technical Field

The utility model relates to the technical field of bridges, in particular to a light truss bridge with cooperative stress of pedestrian guardrails.

Background

The pedestrian overpass is one of important traffic facilities for relieving the problem of road contention between people and vehicles and ensuring smooth and effective urban traffic, and is widely used in recent years due to the advantages of easy up and down of pedestrians, convenient installation and the like. In a conventional pedestrian overpass with a limited girder height, the bridge structure is often unfavorable to be in a structural form with an overhead bridge due to the requirements of pedestrian vision, overall landscape and economy, so that the upper structure is usually in a structural form of a steel box girder, and the structural control height of the upper structure can only be controlled to be 1/25-1/30. However, many factors such as road traffic arrangement, land parcel planning and the like can increase the height of the steel box girder, and the scheme is possibly infeasible or the landscape effect is poor. For example, under the influence of river channel flood level, when a pedestrian passageway is connected with the embankments at two sides, the embankments can be raised too high, and the safety in use of the embankments and the normal use of the passageway are greatly influenced; after crossing the road, the pedestrian path may not be engaged with the structure or ground due to the control beam height being too high. The steel box girder has the advantages that the control height is too high, so that not only is the landscape effect poor, but also the engagement engineering quantity is increased, the construction economy is affected, and the use comfort is reduced. The Chinese patent CN105714670B discloses a single-piece truss type annular pedestrian overpass, which adopts a single-piece annular truss girder as a main stress structure of the overpass, and has stronger capability of adapting to span change; the stress structure is mostly arranged on the bridge deck, so that the bridge deck elevation can be effectively reduced, the engineering cost is saved, and the overall landscape is good. However, in the structure, the pedestrian guard serves as an auxiliary facility only, and becomes a secondary load to act on the main beam, so that the material utilization rate is low. Therefore, a truss bridge needs to be designed, so that the requirements of economy are met while the height of the control beam is effectively reduced and the stable and reliable structure is maintained.

Disclosure of utility model

The utility model aims to overcome the defects of the prior art and provide the light truss bridge with the cooperative stress of the pedestrian guardrails, which reduces the height of the control beam and improves the utilization rate of materials.

The aim of the utility model can be achieved by the following technical scheme:

The light truss bridge comprises a railing part and a main truss part, wherein the main truss part comprises a first part and a second part, and the first part and the second part are connected through a lower web plate which is arranged in a triangle;

The railing part is located at the top of the main truss part and comprises an upper chord member and an upper web member, wherein the upper chord member and the upper web member are arranged in a triangular truss form which is adaptive to the main truss part and are stressed cooperatively with the main truss part.

Further, a local stiffening plate is arranged in the upper chord member at the joint of the upper chord member and the upper web member, and a local node plate is arranged in the upper web member.

Further, the first portion includes a center chord and a center cross member, the center cross member being disposed uniformly perpendicular to the center chord.

Further, the first portion includes a middle diagonal strut, the middle diagonal strut and the middle cross beam forming a triangular arrangement.

Further, the second portion comprises a lower chord member, a bottom cross beam and a bottom diagonal brace, wherein the bottom cross beam is perpendicular to the lower chord member and is uniformly arranged, and the bottom diagonal brace and the bottom cross beam form triangular arrangement.

Further, the middle cross beam (200) and the bottom cross beam are connected through cross bar diagonal braces arranged in a triangle.

Further, a vertical rod diagonal bracing is clamped and arranged between the cross rod diagonal bracing in the triangular arrangement.

Further, the main girder part is a single-span steel girder or a multi-span steel girder.

Further, each rod piece adopts a round section or an I-shaped section and is connected in a welding mode.

Further, the lightweight truss bridge adopts Q235 and above grade steel.

Compared with the prior art, the utility model has the following advantages:

1. In the utility model, the railing part is positioned at the top of the main truss part and comprises the upper chord member and the upper web member, the upper chord member and the upper web member are arranged in a triangular truss form which is suitable for the main truss part, the railing part is used as a conventional pedestrian railing and also participates in the integral stress of the truss, the control beam height of the main truss can be further reduced, the material utilization rate is high, and the manufacturing cost is economical.

2. In the utility model, the local stiffening plate is arranged in the upper chord member at the joint of the upper chord member and the upper web member, and the local node plate is arranged in the upper web member, and meanwhile, most rod members are arranged in a triangle shape, so that the stability and durability of structural connection are improved.

3. In the utility model, each rod piece adopts a circular section or an I-shaped section, and the main truss part can be single-span or multi-span and can be matched with the stress and landscape requirements; the utility model adopts Q235 and the steel with the grade above, and the vertical rigidity, the torsional rigidity and the transverse rigidity of the structure are more advantageous than those of an aluminum alloy structure.

Drawings

FIG. 1 is an elevation view of the present utility model;

FIG. 2 is a mid-plane view of the present utility model;

FIG. 3 is a bottom plan view of the present utility model;

FIG. 4 is a cross-sectional view of the present utility model;

FIG. 5 is a schematic diagram of the structure of a large sample A;

FIG. 6 is a schematic cross-sectional structure of bulk sample A;

Wherein: 1. a rail portion; 2. a main girder portion; 3. a main beam center line; 4. large sample A; 110. an upper chord; 120. an upper web member; 130. a middle chord; 140. a lower web; 150. a lower chord; 160. a bottom cross beam; 170. a bottom diagonal brace; 180. a cross bar diagonal bracing; 190. middle diagonal bracing; 200. a middle cross beam; 210. a local stiffening plate; 220. a local gusset.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.

In the description of the present utility model, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present utility model and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present utility model. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

Examples:

The embodiment provides a light truss bridge cooperatively stressed by a pedestrian guardrail, which comprises a railing part 1 and a main truss part 2, wherein the main truss part 2 can be a single-span steel truss or a multi-span steel truss, and the single-span steel truss is taken as an example in the embodiment. As shown in fig. 1, the main girder portion 2 comprises a first portion and a second portion, which are connected by a lower web 140 arranged in a triangle. As shown in fig. 2, the first portion includes the middle chord 130, the middle diagonal brace 190 and the middle cross member 200, the middle cross member 200 is uniformly disposed perpendicular to the middle chord 130, the middle diagonal brace 190 and the middle cross member 200 form a triangular arrangement, and the middle diagonal brace can be simplified or eliminated according to the stress in case of sufficient torsional rigidity. As shown in fig. 3, the second portion includes a bottom chord 150, a bottom cross member 160, and a bottom diagonal brace 170, the bottom cross member 160 being uniformly disposed perpendicular to the bottom chord 150, the bottom diagonal brace 170 and the bottom cross member 160 forming a triangular arrangement. As shown in fig. 4, the middle rail 200 and the bottom rail 160 are connected by a rail diagonal brace 180 in a triangular arrangement. In a preferred embodiment, the cross bar diagonal braces 180 arranged in a triangle shape can be clamped and provided with vertical bar diagonal braces, so that the reliability of the structure is further improved.

The railing part 1 is located at the top of the main truss part 2, and comprises an upper chord 110 and an upper web member 120 which are arranged in a triangular truss form and are matched with the main truss part 2, so that the cooperative stress of the railing part 1 and the main truss part 2 is realized, the control beam height of the main truss can be further reduced, and the utilization rate of materials is improved.

Each rod piece can adopt other proper section forms, such as an I-shaped section or a circular section, according to stress and landscape requirements; all the members can be welded, as shown in fig. 5, at the joint of the upper chord member 110 and the upper web member 120, the upper chord member 110 is provided with a local stiffening plate 210, and the upper web member 120 is provided with a local gusset plate 220, so that the connection is more stable.

The utility model can adopt Q235 and above grade steel, and the connection mode is flexible. Besides welding, bolting meeting the stress requirement can be adopted, and according to the actual engineering situation, the structure can be welded into sections by adopting partial factories and is bolted section by section on site, and the construction section is basically not limited in particular. The vertical rigidity, torsional rigidity and transverse rigidity of the structure are more advantageous than those of an aluminum alloy structure, so that the utility model has wider application scenes and more economic engineering cost.

While the utility model has been described with reference to certain preferred embodiments, it will be understood by those skilled in the art that various changes and substitutions of equivalents may be made and equivalents will be apparent to those skilled in the art without departing from the scope of the utility model. Therefore, the protection scope of the utility model is subject to the protection scope of the claims.

Claims (10)

1. The light truss bridge is characterized by comprising a railing part (1) and a main truss part (2), wherein the main truss part (2) comprises a first part and a second part, and the first part and the second part are connected through a lower web (140) which is arranged in a triangle;

The railing part (1) is located at the top of the main truss part (2) and comprises an upper chord member (110) and an upper web member (120), wherein the upper chord member (110) and the upper web member (120) are arranged in a triangular truss form which is matched with the main truss part (2) and are stressed cooperatively with the main truss part (2).

2. The light truss bridge cooperatively stressed by pedestrian guardrails according to claim 1, wherein a local stiffening plate (210) is arranged in the upper chord (110) at the joint of the upper chord (110) and the upper web member (120), and a local gusset plate (220) is arranged in the upper web member (120).

3. The cooperatively stressed lightweight truss bridge of claim 1, wherein said first section includes a center chord (130) and a center cross member (200), said center cross member (200) being disposed uniformly perpendicular to said center chord (130).

4. A cooperatively stressed lightweight truss bridge according to claim 3, characterized in that said first section includes a middle diagonal (190), said middle diagonal (190) and said middle cross member (200) forming a triangular arrangement.

5. A cooperatively stressed lightweight truss bridge according to claim 3, wherein said second portion comprises a bottom chord (150), a bottom cross member (160) and bottom diagonal braces (170), said bottom cross member (160) being disposed uniformly perpendicular to said bottom chord (150), said bottom diagonal braces (170) and said bottom cross member (160) forming a triangular arrangement.

6. A cooperatively stressed lightweight truss bridge according to claim 5, wherein said middle girder (200) and said bottom girder (160) are connected by triangularly arranged cross-bar diagonal braces (180).

7. The cooperatively stressed light truss bridge of claim 6, wherein said triangularly arranged cross-bar braces (180) are sandwiched between vertical-bar braces.

8. A cooperatively stressed light truss bridge according to claim 1, characterized in that said main truss section (2) is a single-span or multi-span steel truss.

9. A cooperatively stressed light truss bridge according to any one of claims 1-8, wherein each rod is welded to each other in a circular or i-shaped cross-section.

10. A light truss bridge cooperatively stressed by a pedestrian safety barrier according to any one of claims 1-8, wherein the light truss bridge is made of steel of grade Q235 and above.