Middle support area structure of continuous composite beam bridge and continuous composite beam bridge

Abstract

The middle support area structure comprises two narrow steel boxes which are arranged in parallel in the bridge direction, each narrow steel box comprises a middle support section and midspan sections located on the two sides of the middle support section, and the bottom of the inner side of each middle support section is filled with concrete; a bridge deck slab is poured between the tops of the two narrow steel boxes, and ultra-high performance concrete is poured on the upper layer of the bridge deck slab and located above the middle support section. The invention has the following beneficial effects: the hogging moment area has the dual combination effect of the narrow steel box filled with concrete and the ultra-high performance concrete bridge deck slab, so that the hogging moment and shearing resistance of the section of the middle support section is improved, and the stress performance is improved; the situation that the bearing capacity and durability of a middle support area of an existing narrow steel box-concrete continuous composite beam bridge are insufficient is overcome, inward bending of the middle support area is limited by filled concrete, the local stability is greatly improved, and arrangement of web plates and bottom plate stiffening ribs can be reduced.

Description

Technical Field

[0001] The invention relates to the field of bridge engineering, and in particular to a middle support area structure of a continuous composite beam bridge and a continuous composite beam bridge. Background Art

[0002] A continuous beam is a beam with three or more supports in construction, bridges and other projects. The area of ​​0.15-0.2 times the span on both sides of the middle support is called the middle support area. A composite beam is a beam made of two different materials or different processes.

[0003] The combination of the middle support area of ​​the existing narrow steel box-concrete continuous composite beam bridge is unreasonable. Under negative bending moment, the steel beam is subjected to bending pressure, which causes premature local buckling of the bottom plate and web; the ordinary reinforced concrete bridge deck is subjected to bending tension, causing the concrete slab in the negative bending moment area to easily crack, resulting in the degradation of structural stiffness, corrosion of steel bars, shear connectors and steel beams, and affecting the durability of the structure.

[0004] Therefore, the bearing capacity and crack control issues in the middle support area are bottlenecks restricting the design and application of narrow steel box-concrete continuous beam bridges. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a middle support area structure and a continuous composite beam bridge with stronger bearing capacity and good structural strength.

[0006] The technical solution of the present invention to solve the above technical problems is as follows: a middle support area structure of a continuous composite beam bridge, comprising at least two narrow steel boxes arranged in parallel along the bridge direction, the narrow steel boxes comprising a plurality of middle support sections and mid-span sections located on both sides of the middle support section in the length direction and open at the top, the inner bottom of the middle support section is filled with concrete;

[0007] A bridge deck is cast between the tops of the two narrow steel boxes, and the upper layer of the bridge deck is cast with ultra-high performance concrete, and the ultra-high performance concrete is located above the middle support section.

[0008] The beneficial effects of the present invention are: 1. The negative bending moment zone is formed by the dual combination of a narrow steel box filled with concrete and an ultra-high performance concrete bridge deck, which improves the ability of the cross-section of the middle support section to resist negative bending moments and shear forces, and the stress performance is improved, overcoming the problem of insufficient bearing capacity and durability of the middle support area of ​​existing narrow steel box-concrete continuous composite beam bridges. In addition, the inward bending of the middle support section is restricted by the filled concrete, and the local stability is greatly improved, which can reduce the arrangement of web and bottom plate stiffening ribs.

[0009] 2. The overall structural weight is reduced and the structural ductility is improved, which improves the structural seismic performance and the fatigue resistance of the narrow steel box.

[0010] 3. The improvement of the bending and shearing capacity of the middle support section makes it better adapt to the internal force distribution characteristics of the continuous beam structure than the traditional steel-concrete composite continuous beam bridge.

[0011] Based on the above technical solution, the present invention can also be improved as follows.

[0012] Furthermore, two inclined partitions are relatively fixedly provided on the inner bottom surface of the middle support section, and the space between the inclined partitions is filled with concrete.

[0013] The beneficial effect of adopting the above further solution is that the inclined partition restricts the position of the concrete in the narrow steel box, thereby improving the strength of the narrow steel box.

[0014] Furthermore, a cover plate is fixedly provided between the top surfaces of the two inclined partitions, and a casting hole is opened on the cover plate.

[0015] The beneficial effect of adopting the above further solution is that the cover plate and the inner wall of the narrow steel box form a box-shaped section, so that the filling concrete and the narrow steel box are better integrated, the concrete strength is increased, and the ductility is improved.

[0016] Furthermore, a plurality of first bolts are fixedly provided on the inner side of the bottom plate and the inner sides of the two side plates of the middle support section, and the first bolts are located between the two inclined partitions.

[0017] The beneficial effect of adopting the above further solution is that it is easy to combine the concrete with the narrow steel box.

[0018] Furthermore, a plurality of reserved grooves are opened on the bridge deck along the transverse direction of the bridge, the reserved grooves are located directly above the middle support section, and the ultra-high performance concrete is located in the reserved grooves.

[0019] The beneficial effect of adopting the above further solution is that the bridge deck has a reserved position for ultra-high performance concrete, which is poured in two steps to form a composite bridge deck.

[0020] Furthermore, the bridge deck is made of ordinary concrete.

[0021] The beneficial effect of adopting the above further solution is: reducing construction costs.

[0022] Furthermore, a plurality of second bolts are fixedly provided on the middle support section and the top surface of the mid-span section.

[0023] The beneficial effect of adopting the above further solution is that it is easy to combine the middle support section and the mid-span section with the bridge deck.

[0024] Furthermore, a plurality of stiffening plates are fixedly provided at the opening at the top of the mid-span section.

[0025] The beneficial effect of adopting the above further solution is to improve the structural strength of the narrow steel box.

[0026] Furthermore, a plurality of stiffening ribs are provided on the outer side walls of the middle support section and the mid-span section.

[0027] The beneficial effect of adopting the above further solution is to improve the structural strength of the narrow steel box.

[0028] A continuous composite beam bridge comprises the middle support area structure described in any one of the above items.

[0029] The beneficial effects of this solution are as follows: the negative bending moment zone of the bridge is loaded by a double section consisting of a narrow steel box filled with concrete and an ultra-high performance concrete composite bridge deck, and the stress performance of the negative bending moment zone is improved, overcoming the problem of insufficient bearing capacity and durability of the support area in the existing narrow steel box-concrete continuous composite beam bridge. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic elevation diagram of the narrow steel box of the present invention.

[0031] Figure 2 It is a schematic elevation diagram of the narrow steel box-concrete continuous composite beam of the present invention.

[0032] Figure 3 It is a schematic diagram of a narrow steel box of a single middle support section of the present invention.

[0033] Figure 4 It is a schematic diagram of a bridge deck with a single middle support section according to the present invention.

[0034] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0035] 1. Narrow steel box; 2. Bridge deck; 3. Ultra-high performance concrete; 4. Inclined diaphragm; 5. Cover plate; 6. Casting hole; 7. First bolt; 8. Second bolt; 9. Reinforced plate;

[0036] 101. Middle support section; 102. Mid-span section. DETAILED DESCRIPTION

[0037] The principles and features of the present invention are described below. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0038] Example 1

[0039] like Figures 1 to 4As shown, a middle support area structure of a continuous composite beam bridge comprises at least two narrow steel boxes 1 arranged in parallel along the longitudinal direction of the bridge, wherein the narrow steel boxes 1 comprise a plurality of middle support sections 101 and mid-span sections 102 located on both sides of the middle support sections 101 in the length direction and open at the top, and the inner bottom of the middle support sections 101 is filled with concrete;

[0040] A bridge deck 2 is cast between the tops of the two narrow steel boxes 1 , and ultra-high performance concrete 3 is cast on the upper layer of the bridge deck 2 . The ultra-high performance concrete 3 is located above the middle support section 101 .

[0041] The beneficial effects of this embodiment are: 1. The negative bending moment area is formed by the dual combination of the narrow steel box filled with concrete and the ultra-high performance concrete bridge deck, which improves the ability of the cross-section of the middle support section 101 to resist negative bending moments and shear forces, and the stress performance is improved, overcoming the problem of insufficient bearing capacity and durability of the middle support area of ​​the existing narrow steel box-concrete continuous composite beam bridge. In addition, the inward bending of the middle support section 101 is restricted by the filled concrete, and the local stability is greatly improved, which can reduce the arrangement of the web and bottom plate stiffening ribs.

[0042] Second, the overall structural weight is reduced and the structural ductility is improved, thereby improving the structural seismic performance and the fatigue resistance of the narrow steel box 1.

[0043] 3. The improvement of the bending and shearing capacity of the cross section 101 in the middle support section makes it better adapted to the internal force distribution characteristics of the continuous beam structure than the traditional steel-concrete composite continuous beam bridge.

[0044] Specifically, a continuous beam bridge has multiple support points along the length of each beam. The middle support is the middle support, and the area between the two supports is the mid-span area. The number of middle supports of a continuous beam bridge varies according to the distance, such as Figure 1 and Figure 3 As shown, a two-span beam has only one intermediate support, a three-span beam has two intermediate supports, and so on;

[0045] The longitudinal direction is the length direction of the central axis of the bridge, and the transverse direction is the direction perpendicular to the central axis of the bridge. Two narrow steel boxes 1 are arranged along the longitudinal direction as the main beams of the bridge, and the bridge deck 2 is cast on the top of the two rows of narrow steel boxes 1. Two narrow steel boxes 1 are generally used for bridges with a width of less than 20 meters. The number of main beams can be increased for wider bridges.

[0046] The narrow steel box 1 is supported by the middle support section 101, and the top surface of the mid-span section 102 is compressed by a concrete bridge slab to save steel, and the mid-span section 102 is opened to facilitate pouring concrete inside.

[0047] Example 2

[0048] like Figures 1 to 4As shown, preferably, on the basis of Example 1, two inclined partitions 4 are relatively fixedly provided on the inner bottom surface of the middle support section 101, and the space between the inclined partitions 4 is filled with concrete.

[0049] The beneficial effect of adopting the preferred solution in the above embodiment is that the inclined partition 4 constrains the position of the concrete in the narrow steel box 1, thereby improving the strength of the narrow steel box 1.

[0050] Preferably, a cover plate 5 is fixedly provided between the top surfaces of the two inclined partitions 4 , and a casting hole 6 is opened on the cover plate 5 .

[0051] The beneficial effects of adopting the preferred solution in the above embodiment are: the cover plate 5 and the inner wall of the narrow steel box 1 form a box-shaped section, so that the filling concrete and the narrow steel box 1 are better bonded, the concrete strength is increased, and the ductility is improved.

[0052] Preferably, a plurality of first bolts 7 are fixedly provided on the inner side of the bottom plate and the inner sides of the two side plates of the middle support section 101 , and the first bolts 7 are located between the two inclined partitions 4 .

[0053] The beneficial effect of adopting the preferred solution in the above embodiment is that it is easy to fill concrete and combine with the narrow steel box 1.

[0054] Specifically, the cover plate 5 and the inclined partition plate 4 are first welded in the narrow steel box 1, and then concrete is poured through the pouring holes 6, which has good bonding properties.

[0055] Example 3

[0056] like Figures 1 to 4 As shown, preferably, on the basis of Embodiment 1-2, a plurality of reserved grooves are opened on the bridge deck 2 along the transverse direction of the bridge, the reserved grooves are located directly above the middle support section 101, and the ultra-high performance concrete 3 is located in the reserved grooves.

[0057] The beneficial effect of adopting the preferred solution in the above embodiment is that the bridge deck 2 reserves a space for the ultra-high performance concrete 3, and the composite bridge deck is cast in two times.

[0058] Preferably, the bridge deck 2 is made of ordinary concrete.

[0059] The beneficial effect of adopting the preferred solution in the above embodiment is: reducing construction costs.

[0060] Specifically, in this embodiment, the bridge deck 2 is normal concrete (Normal Concrete, also known as NC), the bridge deck 2 is cast on site, the middle support section 101 and the mid-span section 102 are cast simultaneously, and then ultra-high performance concrete 3 (Ultra-High Performance Concrete, also known as UHPC) is cast using the bridge deck 2 as a template to form a composite bridge deck.

[0061] Example 4

[0062] like Figures 1 to 4 As shown, preferably, on the basis of embodiments 1-3, a plurality of second bolts 8 are fixedly provided on the top surfaces of the middle support section 101 and the mid-span section 102 .

[0063] The beneficial effect of adopting the preferred solution in the above embodiment is that it facilitates the combination of the middle support section 101 and the mid-span section 102 with the bridge deck 2.

[0064] Example 5

[0065] like Figures 1 to 4 As shown, preferably, on the basis of embodiments 1-4, a plurality of stiffening plates 9 are fixedly provided at the opening at the top of the mid-span section 102 .

[0066] The beneficial effect of adopting the preferred solution in the above embodiment is: improving the structural strength of the narrow steel box 1.

[0067] Preferably, a plurality of stiffening ribs are provided on the outer side walls of the middle support section 101 and the mid-span section 102 .

[0068] The beneficial effect of adopting the preferred solution in the above embodiment is: improving the structural strength of the narrow steel box 1.

[0069] Example 6

[0070] A continuous composite beam bridge comprises the middle support area structure described in any one of the above items.

[0071] The beneficial effects of this solution are as follows: the negative bending moment zone of the bridge is supported by a double composite section consisting of a narrow steel box 1 filled with concrete and a composite bridge deck of ultra-high performance concrete 3, and the stress performance of the negative bending moment zone is improved, thus overcoming the problem of insufficient bearing capacity and durability of the support area in the existing narrow steel box-concrete continuous composite beam bridge.

[0072] The specific construction steps are:

[0073] 1. First, weld the first bolt 7, the inclined partition 4 and the cover plate 5 on the inner side of the middle support section 101, and erect the narrow steel box 1 continuous beam;

[0074] 2. Pour concrete through the pouring holes 6 of the cover plate 5;

[0075] 3. Casting the bridge deck 2 on top of the narrow steel box 1;

[0076] 4. Pour ultra-high performance concrete 3 on the bridge deck 2.

[0077] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0078] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0079] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0080] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0081] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0082] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A middle support area structure of a continuous composite beam bridge, characterized in that: The invention comprises at least two narrow steel boxes (1) arranged in parallel along the longitudinal direction of the bridge, wherein the narrow steel boxes (1) comprise a plurality of middle support sections (101) and mid-span sections (102) located on both sides of the middle support sections (101) in the longitudinal direction and open at the top, and the inner bottom of the middle support sections (101) is filled with concrete; A bridge deck (2) is cast between the tops of the two narrow steel boxes (1), and ultra-high performance concrete (3) is cast on the upper layer of the bridge deck (2), and the ultra-high performance concrete (3) is located above the middle support section (101).

2. The middle support area structure of a continuous composite beam bridge according to claim 1, characterized in that: Two inclined partitions (4) are relatively fixedly arranged on the inner bottom surface of the middle support section (101), and the space between the inclined partitions (4) is filled with concrete.

3. The middle support area structure of a continuous composite beam bridge according to claim 2, characterized in that: A cover plate (5) is fixedly arranged between the top surfaces of the two inclined partition plates (4), and a casting hole (6) is opened on the cover plate (5).

4. The middle support area structure of a continuous composite beam bridge according to claim 2, characterized in that: A plurality of first bolts (7) are fixedly provided on the inner side of the bottom plate and the inner sides of the two side plates of the middle support section (101), and the first bolts (7) are located between the two inclined partitions (4).

5. The middle support area structure of a continuous composite beam bridge according to claim 1, characterized in that: A plurality of reserved grooves are provided on the bridge deck (2) along the transverse direction of the bridge, the reserved grooves are located directly above the middle support section (101), and the ultra-high performance concrete (3) is located in the reserved grooves.

6. The middle support area structure of a continuous composite beam bridge according to claim 5, characterized in that: The bridge deck (2) is made of ordinary concrete.

7. The middle support area structure of a continuous composite beam bridge according to claim 1, characterized in that: A plurality of second bolts (8) are fixedly provided on the top surfaces of the middle support section (101) and the mid-span section (102).

8. The middle support area structure of a continuous composite beam bridge according to any one of claims 1 to 7, characterized in that: A plurality of stiffening plates (9) are fixedly provided at the opening at the top of the mid-span section (102).

9. A middle support area structure of a continuous composite beam bridge according to any one of claims 1 to 7, characterized in that: A plurality of stiffening ribs are arranged on the outer side walls of the middle support section (101) and the mid-span section (102).

10. A continuous composite beam bridge, characterized in that: It comprises the middle support area structure as claimed in any one of claims 1 to 9.

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