Ultra-wide large-span composite beam bridge

Abstract

The utility model provides an ultra-wide large-span composite beam bridge which comprises a foundation, two side piers, two middle piers and a steel concrete composite beam, the steel concrete composite beam is composed of a steel main beam, a UHPC bridge deck slab and concrete, and the steel main beam is erected on the side piers and the middle piers; the thickness of the UHPC bridge deck slab is 6-10 cm, the steel main beam comprises a closed steel box and a cantilever arm, a motor vehicle lane and a pedestrian and non-motor vehicle lane are arranged on the UHPC bridge deck slab, and steel beam bottom plates of the two middle piers are combined with concrete. The utility model provides an ultra-wide and large-span combined beam bridge which can be suitable for a highway-rail combined bridge with the span of more than 200m and the ultra-wide bridge width, the bridge width meets the requirements of two-way eight-lane and two-lane light rails, a pedestrian and non-motorized vehicle lane can be arranged, the utilization efficiency of the bridge is improved, and the beam bridge structure is more attractive; and the development of the ultra-wide and large-span composite beam bridge is promoted.

Description

Technical Field

[0001] The utility model belongs to the technical field of bridge engineering, and in particular relates to an ultra-wide and large-span composite beam bridge. Background Art

[0002] The long-span steel-concrete composite box girder bridge has experienced decades of development, especially since the 1980s, European countries have done a lot of work in the research, design and construction of steel-concrete composite box girders. With the deepening of basic theoretical research and the advancement of design theory and design methods, a large number of highway and railway long-span composite box girder continuous girder bridges have been built. These bridges concentrate on new research results, new design methods and new construction processes. For example, the Caroni Bridge in Venezuela has a main span of 213.75m and a bridge deck width of 30.4m. The construction of these bridges fully demonstrates the competitiveness of composite structure bridges in terms of economy, durability and bridge aesthetics.

[0003] For some areas, due to the limitation of aviation clear height or the requirement of coordination with the surrounding landscape and buildings or the limitation of connection with the main bridge, when the span of the bridge is greater than 200m, the bridge cannot be designed as a cable-supported structure or a truss structure, and a continuous beam bridge is required to cross the structure or river. When the span exceeds 200m, most of the continuous beams built in China currently use steel box beams, and the fatigue problem of steel box beam bridge decks has always been urgently needed to be solved. For composite beams, due to the heavy weight of concrete, the stress on the main beam is increased, which limits the development of the span of composite continuous beams. In order to save resources and improve the utilization efficiency of bridges, most bridges are currently built by combining highways and non-motorized lanes, or by combining highways and rails. The width of the bridge deck is large, and the lateral stress problem is more prominent. The increase in lateral materials increases the longitudinal stress on the main beam. Therefore, how to solve the stress of ultra-wide and large-span composite beam bridges and balance the mechanics and aesthetics of wide bridge decks and high beams has always been a key issue in this field. Utility Model Content

[0004] In order to overcome the shortcomings of the prior art, the utility model provides an ultra-wide and large-span composite beam bridge, which is applicable to spans of more than 200m. The bridge width is ultra-wide and can be applicable to road-rail combined bridges. The bridge width meets the requirements of eight lanes in both directions, two-lane light rail, and pedestrian and non-motorized vehicle lanes. The composite beam bridge of the utility model improves the utilization efficiency of the bridge while making the beam bridge structure more beautiful, thereby promoting the development of ultra-wide and large-span composite beam bridges.

[0005] The technical solution adopted by the utility model to achieve the above-mentioned purpose is: an ultra-wide and large-span composite beam bridge, comprising a foundation 1, two side piers 2, two middle piers 3 and a steel-concrete composite beam, wherein the steel-concrete composite beam is composed of a steel main beam 4, a UHPC bridge deck 7 and concrete 8, and the steel main beam 4 is erected on the side piers 2 and the middle pier 3.

[0006] Preferably, the thickness of the UHPC bridge deck 7 is 6 to 10 cm.

[0007] Preferably, the steel main beam 4 includes a closed steel box 5 and a cantilever arm 6.

[0008] Preferably, the UHPC bridge deck 7 is provided with a motor vehicle lane and a pedestrian and non-motor vehicle lane.

[0009] Preferably, the steel beam bottom plates of the two middle piers 3 are combined with concrete 8 .

[0010] Compared with the prior art, the at least one technical solution adopted in the embodiments of this specification can achieve the following beneficial effects:

[0011] (1) The utility model adopts 6-10 cm thick UHPC bridge deck and steel beam bottom plate combined with concrete at the middle pier support point, which reduces the deadweight of the main beam and improves the bending bearing capacity of the composite beam and the fatigue resistance of the bridge deck;

[0012] (2) The steel main beam of the utility model includes a closed steel box and a cantilever. The height of the closed steel box varies longitudinally, and the cantilever has the same height and width in the longitudinal direction of the bridge. The height of the main box chamber is increased, and large cantilevers of the same height are adopted to widen the bridge deck width of the box beam, which can simultaneously meet the needs of eight lanes in both directions, two light rails and pedestrian and non-motorized vehicle lanes, thereby improving the utilization efficiency of the bridge and making the bridge structure more beautiful, thereby promoting the development of ultra-wide and large-span composite beam bridges. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without paying creative work.

[0014] Figure 1 This is a schematic diagram of the structure of the ultra-wide and large-span composite beam bridge of the utility model;

[0015] Figure 2 This is a schematic diagram of the cross-sectional structure at the mid-span of the ultra-wide and large-span composite beam bridge of the utility model;

[0016] Figure 3 This is a schematic diagram of the cross-sectional structure of the middle pier of the ultra-wide and large-span composite beam bridge of the utility model;

[0017] Figure 4 It is a schematic diagram of the construction process of the ultra-wide and large-span composite beam bridge of the utility model;

[0018] Figure 5 It is a schematic diagram of the AA section of the scattered support structure of the ultra-wide and large-span composite beam bridge of the utility model;

[0019] Figure 6 It is a schematic diagram of the BB section of the scattered support structure of the ultra-wide and large-span composite beam bridge of the utility model;

[0020] Figure 7 It is a schematic diagram of the cantilever arm assembly and positioning device of the ultra-wide and large-span composite beam bridge of the utility model.

[0021] Description of Reference Numerals

[0022] 1. Foundation; 2. Side pier; 3. Middle pier; 4. Steel main beam; 5. Closed steel box; 6. Cantilever; 7. UHPC bridge deck; 8. Concrete; 9. Temporary pier; 10. Scrapped bracket; 11. Reaction seat; 12. Three-way jack; 13. Small steel beam; 14. Steel longitudinal beam; 15. Distribution steel beam; 16. Steel column; 17. Steel horizontal brace; 18. Steel diagonal brace; 19. Expanded foundation; 21. Guide bracket; 22. Temporary matching parts. DETAILED DESCRIPTION

[0023] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0024] The following describes the implementation methods of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific implementation methods, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, in the absence of conflict, the following embodiments and the features in the embodiments can be combined with each other. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work belong to the scope of protection of the present application.

[0025] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0026] Example 1

[0027] See also Figure 1-3The utility model provides a technical solution: an ultra-wide large-span composite beam bridge, comprising a foundation 1, two side piers 2, two middle piers 3 and a steel-concrete composite beam, wherein the steel-concrete composite beam is composed of a steel main beam 4, a UHPC bridge deck 7 and concrete 8, and the steel main beam 4 is erected on the side piers 2 and the middle pier 3; wherein the thickness of the UHPC bridge deck 7 is 6 to 10 cm, and a motor vehicle lane and a pedestrian non-motor vehicle lane are provided on the UHPC bridge deck 7; the steel main beam 4 comprises a closed steel box 5 and a cantilever 6, the height of the closed steel box 5 varies longitudinally, and the cantilever 6 has the same height and width in the longitudinal direction of the bridge; the bottom plate of the steel beam of the middle pier 3 is combined with concrete 8. The selection of the 6 to 10 cm thick UHPC bridge deck 7 and the setting of the bottom plate of the steel beam of the middle pier 3 combined with concrete 8 improve the bending bearing capacity of the composite beam while reducing the dead weight of the main beam, and improve the fatigue resistance of the bridge deck.

[0028] like Figure 4 As shown, the construction process of the composite beam bridge includes the following steps:

[0029] S1: construct foundation 1, two side piers 2, two middle piers 3, and construct several temporary piers 9 and several loose support brackets 10 between the piers;

[0030] S2: Splice the steel main beam 4 on the temporary pier 9 and the loose assembly support 10. After the steel main beam 4 is constructed to the joint section, pour the steel beam bottom plate combined with concrete 8 at the middle pier support point;

[0031] S3: Remove the loose support 10, apply pre-loading force on the top of the temporary pier 9, adjust the line shape of the steel beam, and install the mid-span closure section;

[0032] S4: Cast the UHPC bridge deck 7 at the middle of the main span and the end of the side span beam. After the UHPC bridge deck 7 is combined with the steel main beam 4, the temporary pier 9 is removed;

[0033] S5: pour the remaining UHPC bridge deck 7 from the mid-span and the side span beam ends to the middle pier 3;

[0034] S6: Construction of all the bridge's ancillary works.

[0035] like Figure 5As shown, in the construction process S2, the loose assembly bracket 10 adopts a three-way adjustable loose assembly bracket, and the loose assembly bracket 10 is composed of a number of reaction seats 11, three-way jacks 12, small steel beams 13, steel longitudinal beams 14, distribution steel beams 15, steel columns 16, steel cross braces 17, steel diagonal braces 18 and expanded foundations 19. The reaction seat 11 and the three-way jack 12 are placed on the top of the distribution steel beam 15, the reaction seat 11 corresponds to the steel beam diaphragm, and the three-way jack 12 corresponds to the steel beam web. The closed steel box 5 is assembled on the small steel beam 13. After the segment assembly is completed, the steel box segment is lifted up by the three-way jack 12 and adjusted in three directions. After the adjustment is completed, the steel box segment is mounted on the reaction seat 11, and a circumferential seam is applied with the previous segment at an appropriate temperature. In order to adapt to the longitudinal deformation of the steel beam under temperature, two stainless steel slideways are set between the reaction seat 11 and the distribution steel beam 15;

[0036] like Figure 6 As shown, for the steel main beam 4, utilizing the characteristics of the steel box straight web becoming higher while the cantilever arm remains unchanged, first the closed steel box 5 is segmentally spliced, and then the cantilever arm 6 is installed segmentally, and the temporary matching parts 22 and the guide brackets 21 between the middle closed box body 5 and the cantilever arm 6 segments are used as guide devices for the installation and positioning of the cantilever arm 6 segments, and the segments are roughly positioned, and then the punch pins on the connecting parts are used to temporarily fix the installed cantilever arm 6 segments through the connecting parts with bolts, and then permanently welded.

[0037] In construction process S3, a jack is installed on the top of temporary pier 9 to control the reaction force at the temporary pier through active jacking, and actively control the internal force of the continuous beam bridge with a span of more than 200m to meet the design requirements.

[0038] In construction process S4, the casting length of the UHPC bridge deck 7 at the side span beam end along the bridge direction is 0.4 to 0.5 times the span of the side span, and the casting length of the UHPC bridge deck 7 in the middle of the main span along the bridge direction is 0.5 to 0.6 times the span of the middle span.

[0039] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable ordinary technicians in the field to understand the content of the utility model and implement it accordingly, and they cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the essence of the content of the utility model should be included in the protection scope of the utility model.

Claims

1. An ultra-wide long-span composite beam bridge, comprising a foundation (1), two side piers (2), two middle piers (3) and a steel-concrete composite beam, characterized in that: The steel-concrete composite beam is composed of a steel main beam (4), a UHPC bridge deck (7) and concrete (8); the steel main beam (4) is erected on the side pier (2) and the middle pier (3); the thickness of the UHPC bridge deck (7) is 6 to 10 cm; the steel main beam (4) includes a closed steel box (5) and a cantilever arm (6); a motor vehicle lane and a pedestrian non-motor vehicle lane are provided on the UHPC bridge deck (7); the steel beam bottom plates of the two middle piers (3) are combined with concrete (8).

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