UHPC inverted fish-belly prestressed truss girder bridge

Abstract

This utility model discloses a UHPC inverted fish-belly prestressed truss bridge, comprising two sets of oppositely arranged inverted fish-belly truss beams, multiple support legs connected to the inner side of the inverted fish-belly truss beams, a bridge deck supported on the support legs, and transverse connectors for connecting the two sets of inverted fish-belly truss beams. The bridge deck is connected to the inverted fish-belly truss beams by cast concrete. The inverted fish-belly truss beams, support legs, bridge deck, and transverse connectors are all cast from UHPC. The UHPC inverted fish-belly prestressed truss bridge provided by this utility model features prefabricated structure, high strength, high toughness, light structural weight, and low maintenance.

Description

Technical Field

[0001] This utility model relates to the field of beam bridge technology, specifically to a UHPC inverted fish belly type prestressed truss beam bridge. Background Technology

[0002] With the further advancement of bridge industrialization, the construction method has gradually shifted from the traditional method of casting all components on-site to the method of prefabricating some or most components in factories and then transporting them to the site for installation. Compared with traditional construction methods, industrial prefabrication has greatly accelerated the construction speed of bridges and reduced the adverse impact of bridge construction on traffic and the environment.

[0003] Traditional precast concrete structures are heavy and have limited structural options, making it difficult to achieve novel and lightweight bridge structures. Furthermore, the large weight and relatively low tensile strength of ordinary concrete structures result in a significant proportion of their own weight being accounted for by the design load. When applied to long-span truss bridges, this leads to a higher proportion of dead loads, and these effects become more pronounced with larger spans. In contrast, truss bridges are significantly lighter than ordinary concrete beam bridges.

[0004] Currently, the truss beams used in bridges are mainly steel structure truss beams. However, steel is prone to rust in humid environments, especially in environments with corrosive media, and must be painted or galvanized, and should also be regularly maintained during use.

[0005] Therefore, the purpose of this utility model is to provide a UHPC inverted fish belly type prestressed truss beam bridge to solve the above-mentioned technical problems. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide a UHPC inverted fish belly type prestressed truss bridge, which has the characteristics of prefabricated structure, high strength, high toughness, light structural weight and low maintenance.

[0007] The technical solution of this utility model is as follows:

[0008] A UHPC inverted fish-belly prestressed truss bridge includes two sets of inverted fish-belly truss beams arranged opposite each other, multiple support legs connected to the inner side of the inverted fish-belly truss beams, a bridge deck supported on the support legs, and transverse connectors for connecting the two sets of inverted fish-belly truss beams. The bridge deck is connected to the inverted fish-belly truss beams by pouring concrete. The inverted fish-belly truss beams, support legs, bridge deck, and transverse connectors are all cast from UHPC.

[0009] Furthermore, the inverted fish-belly truss beam includes a first main beam and a second main beam spaced apart, an arch rib connected to the first main beam, a first web member connecting the first main beam and the arch rib, and a second web member connecting the first main beam and the second main beam. The bridge deck is connected to the first main beam.

[0010] Furthermore, there is a gap between the bridge deck and the first main beam, and steel bars are pre-embedded on the connection surface between the first main beam and the bridge deck. Concrete is filled in the gap to connect the bridge deck with the UHPC inverted fish belly truss beam.

[0011] Furthermore, the supporting leg is connected to the inverted fish-belly truss by closely welded steel bars.

[0012] Furthermore, the multiple supporting legs are symmetrically distributed.

[0013] Furthermore, the transverse connecting member includes multiple I-beams spaced apart within the bridge span, and end beams located at both ends of the bridge span. The I-beams, the end beams, and the inverted fish-belly truss beam are connected by bolts.

[0014] Furthermore, the upper part of the end crossbeam is flush with the bottom surface of the bridge deck, and the lower part is connected to the second main beam.

[0015] Furthermore, the end beam is X-shaped.

[0016] Compared with the prior art, the UHPC inverted fish-belly type prestressed truss bridge provided by this utility model has the following advantages:

[0017] I. The UHPC inverted fish-belly type prestressed truss bridge provided by this utility model adopts a full UHPC structure, which has the advantages of high tensile and compressive strength, high elastic modulus, high toughness and low creep, making it very suitable for the construction of large bridges. At the same time, UHPC components have high durability, outstanding resistance to external damage, high strength and are not prone to cracking. Meanwhile, due to the excellent material properties of UHPC itself, the probability of UHPC components developing defects is small, which can reduce the probability of later maintenance, thereby reducing the cost of later maintenance and secondary pollution to the environment to a certain extent.

[0018] II. The UHPC inverted fish belly type prestressed truss bridge provided by this utility model has most of its components prefabricated in the factory, which can realize batch prefabrication, construction efficiency and convenience, and facilitate transportation, hoisting and splicing. It can also ensure the construction accuracy of the structure and has good economic benefits and practical value.

[0019] Third, the UHPC inverted fish-belly prestressed truss bridge provided by this utility model has a smooth fish-belly bridge cross-section, a smooth and clean bottom surface, smooth lines, and good landscape effect. At the same time, the prestressing of the first and second main beams of the UHPC inverted fish-belly truss bridge can make full use of the material properties, resulting in good crack resistance of the bridge, which can increase the span and extend the structural life.

[0020] IV. The UHPC inverted fish-belly prestressed truss bridge provided by this utility model only requires casting according to the formwork. Necessary procedures such as horizontal construction, hoisting, and assembly can be completed on-site, eliminating the need for scaffolding and secondary formwork removal. This makes construction more convenient and avoids the problem of large-scale foundation treatment work associated with scaffolding. Furthermore, compared to ordinary steel trusses, the integral concrete casting method is less prone to joint damage. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a structural schematic diagram of the UHPC inverted fish belly type prestressed truss beam bridge of this utility model;

[0023] Figure 2 yes Figure 1 The diagram shows the structure of the inverted fish-belly truss beam in the UHPC inverted fish-belly prestressed truss beam bridge.

[0024] Figure 3 yes Figure 1 The diagram shows the cross-sectional structure of the UHPC inverted fish belly type prestressed truss bridge.

[0025] Figure 4 This is a partial schematic diagram of the connection between the inverted fish-belly truss beam and the bridge deck;

[0026] Figure 5 This is a partial schematic diagram of the connection between the inverted fish-belly truss beam and the I-beam crossbeam. Detailed Implementation

[0027] To enable those skilled in the art to better understand the technical solutions in the embodiments of this utility model, and to make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be further described below in conjunction with the accompanying drawings.

[0028] It should be noted that the descriptions of these embodiments are for the purpose of aiding understanding of the present invention, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0029] Please refer to the following: Figures 1 to 5 ,in Figure 1 This is a structural schematic diagram of the UHPC inverted fish belly type prestressed truss beam bridge of this utility model; Figure 2 yes Figure 1 The diagram shows the structure of the inverted fish-belly truss beam in the UHPC inverted fish-belly prestressed truss beam bridge. Figure 3 yes Figure 1 The diagram shows the cross-sectional structure of the UHPC inverted fish belly type prestressed truss bridge. Figure 4 This is a partial schematic diagram of the connection between the inverted fish-belly truss beam and the bridge deck; Figure 5 This is a partial schematic diagram of the connection between the inverted fish-belly truss beam and the I-beam crossbeam. The UHPC inverted fish-belly prestressed truss beam bridge of this utility model includes two sets of inverted fish-belly truss beams 1 arranged opposite each other, multiple support legs 2 connected to the inner side of the inverted fish-belly truss beams, a bridge deck 3 supported on the support legs, and transverse connectors (unlabeled) for connecting the two sets of inverted fish-belly truss beams. The bridge deck 3 is connected to the inverted fish-belly truss beams 1 by pouring concrete. The inverted fish-belly truss beams 1, support legs 2, bridge deck 3, and transverse connectors are all cast from UHPC, making the beam bridge a full UHPC structure.

[0030] In this utility model, the inverted fish belly truss beam 1 includes a first main beam 11 and a second main beam 12 arranged at intervals, an arch rib 13 connected to the first main beam 11, a first web member 14 connecting the first main beam 11 and the arch rib 13, and a second web member 15 connecting the first main beam 11 and the second main beam 12.

[0031] One side of the support leg 2, which connects to the inverted fish-belly truss beam 1, is equipped with closely welded studs 21. The support leg 2 and the UHPC inverted fish-belly truss 1 are connected by closely welded studs 21. In this embodiment, the support leg 2 is a corbel structure, which connects to the second web member, or simultaneously to the first main beam 11 and the second web member 15. The support legs 2 are symmetrically distributed, and the spacing between the support legs is set according to the span of the beam bridge.

[0032] The bridge deck 3 is supported on the support legs 2, and the width of the bridge deck is less than the distance between the two sets of inverted fish belly truss beams, so that there are gaps between the two sides of the bridge deck 3 and the inverted fish belly truss beams. The bridge deck is connected to the inverted fish belly truss beams by filling the gaps with concrete.

[0033] Specifically, the bridge deck 3 is connected to the first main beam 11. During the prefabrication of the bridge deck 3 and the inverted fish belly truss beam 1, steel bars are pre-embedded on both sides of the bridge deck 3 and the inner side of the first main beam 11. After filling the gap with concrete, the connection between the two can be improved. Preferably, the gap is filled with ultra-high performance concrete.

[0034] Lateral connectors are used to improve the stability of the bridge. They include multiple I-beams 41 spaced apart within the bridge span, and end beams 42 located at both ends of the bridge span. The I-beams 41 and end beams 42 are bolted to the inverted fish-belly truss beam 1. Figure 5 As shown.

[0035] Specifically, the I-beam crossbeam 41 is connected to the second main beam 12 by bolts, and the spacing between two adjacent I-beam crossbeams 41 is set according to the span of the beam bridge.

[0036] The upper part of the end crossbeam 42 is flush with the bottom surface of the bridge deck 3, and the lower part is connected to the second main beam 12. Preferably, the end crossbeam 42 is X-shaped.

[0037] The construction method of the UHPC inverted fish-belly type prestressed truss bridge of this utility model is as follows:

[0038] First, the templates, precast bridge decks, support legs for supporting the bridge decks, and transverse connectors are made for casting the inverted fish-belly truss beams. The bridge decks, support legs, and transverse connectors are all cast from UHPC material.

[0039] The formwork was used to pour ultra-high performance concrete on site for horizontal construction, and prestressed tendons were tensioned at the bottom of the inverted fish belly truss beam. At the same time, support leg structure sections with closely welded steel bars were inserted into appropriate positions of the inverted fish belly truss beam, and steel bars were pre-embedded in appropriate positions of the UHPC inverted fish belly truss beam for connection with the bridge deck.

[0040] Cast the arch base;

[0041] When the cured concrete reaches at least 75% of its design strength, the prestressing tendons are loosened. After the truss beam structure has cured and formed, a large crane is used to turn the truss over and erect it on the corresponding arch abutments.

[0042] The precast bridge deck is transported to the construction site, hoisted, and placed on the support legs, leaving gaps between the bridge deck and the truss beams on both sides.

[0043] After the bridge deck is laid, concrete is poured into the gaps to connect them into a whole.

[0044] The I-beams and end beams of the transverse connecting members are connected to the truss structure by bolts.

[0045] The embodiments of this utility model have been described in detail above with reference to the accompanying drawings, but this utility model is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations made to these embodiments without departing from the principles and spirit of this utility model still fall within the protection scope of this utility model.

Claims

1. A UHPC inverted-f prestressed truss girder bridge, characterized in that, The bridge deck is connected with the inverted fish-belly truss girder by pouring concrete, and the inverted fish-belly truss girder, the support leg, the bridge deck and the transverse connecting piece are all formed by pouring UHPC.

2. The UHPC inverted-fish prestressed truss girder bridge according to claim 1, characterized in that, The inverted fish-belly truss girder comprises a first main girder and a second main girder arranged at intervals, an arch rib connected with the first main girder, a first web strut connecting the first main girder and the arch rib, and a second web strut connecting the first main girder and the second main girder, and the bridge deck is connected with the first main girder.

3. The UHPC inverted-fish prestressed truss girder bridge according to claim 2, characterized in that, The bridge deck and the first main girder have a gap therebetween, the connecting surface of the first main girder and the bridge deck is embedded with steel bars, and the gap is filled with concrete to connect the bridge deck with the UHPC inverted fish-belly truss girder.

4. The UHPC inverted-fish prestressed truss girder bridge of claim 1, wherein, The support leg is connected with the inverted fish-belly truss by tightly welding steel bars.

5. The UHPC inverted-fish prestressed truss girder bridge according to claim 4, characterized in that, A plurality of support legs are symmetrically distributed.

6. The UHPC inverted-fish prestressed truss girder bridge of claim 2, wherein, The transverse connecting piece comprises a plurality of I-beam cross beams arranged at intervals in the bridge span and end cross beams arranged at the two ends of the bridge span, and the I-beam cross beams and the end cross beams are connected with the inverted fish-belly truss girder by bolts.

7. The UHPC inverted-fish prestressed truss girder bridge according to claim 6, characterized in that, The upper part of the end cross beam is flush with the bottom surface of the bridge deck, and the lower part is connected with the second main girder.

8. The UHPC inverted-fish prestressed truss girder bridge according to claim 6, characterized in that, The end cross beam is in the shape of X. The end cross beam is in the shape of X.

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