R-UHPC transversely-connected assembly type steel-concrete composite beam section

Abstract

The utility model belongs to the technical field of bridge engineering, and particularly relates to an R-UHPC transversely-connected assembly type steel-concrete composite beam section. According to the R-UHPC transverse connection assembly type steel-concrete composite beam section, the steel-concrete composite sections, the longitudinal bridge direction prestress steel strands, the R-UHPC wet joint units, the connecting plate units and the transverse bridge direction prestress steel strands are arranged on the concrete sections, so that all the steel-concrete composite sections arranged in the transverse bridge direction can be connected into a whole, and the concrete sections are connected into a whole; and therefore, enough mounting stability can be obtained on the concrete section.

Description

Technical Field

[0001] The utility model belongs to the technical field of bridge engineering, and in particular relates to an assembled steel-concrete composite beam section with R-UHPC transverse connections. Background Art

[0002] The beam sections of a large-span steel-concrete composite cable-stayed bridge generally include: concrete sections, steel beam sections, and steel-concrete composite sections. The steel beam section is the main beam of the cable-stayed bridge.

[0003] The concrete section, on the other hand, is a commonly used reinforced concrete structure. The steel beam section is typically a box beam structure. The steel-concrete composite section typically consists of a box beam filled with concrete. Furthermore, the prefabricated steel-concrete composite beam section is one in which the concrete and steel-concrete composite sections are independent of each other, prefabricated in a factory and assembled on site, resulting in relatively high construction efficiency.

[0004] It's important to note that the steel-concrete junction, typically the transition zone between the concrete section and the steel beam, experiences relatively complex stresses and is a critical component in the design and construction of these cable-stayed bridges. Only by first and stably installing the steel-concrete junction on the concrete section can a high-strength structural foundation be provided for the steel beam.

[0005] For example, the Chinese invention patent application with application publication number CN117626786A and application publication date 2024.03.01 discloses an assembled steel-concrete composite beam, whose structure includes: a steel beam section, a steel-concrete composite section and a concrete section connected longitudinally in sequence, and transverse prestressed steel strands are distributed in the steel-concrete composite section and the concrete section, and the ends of the prestressed steel strands are anchored in the steel beam section.

[0006] The steel-concrete composite beam in the invention patent application has the following general structural principles and advantages: it adopts a cavity structure, sets up two layers of inner and outer steel shells, and combines the steel shells with concrete to form a steel-concrete structure, which reduces the deadweight of the structure, increases the cross-sectional area, gives full play to the performance of the two materials, improves the structural bearing capacity, and is suitable for the construction of large-span hybrid bridges.

[0007] However, in the actual construction and use process of the steel-concrete composite beam, there are at least the following deficiencies, which are also the technical problems to be solved by the present utility model, namely:

[0008] When there are at least two steel-concrete joint sections arranged in the transverse direction of the bridge, there is a lack of necessary and sufficient transverse reinforcement structure between the steel-concrete joint sections, which will indirectly lead to the installation structure of the steel-concrete joint sections on the concrete section being not strong enough.

[0009] Therefore, in summary, there is an urgent need for a high-strength connection between the steel-concrete composite section and the concrete section, and multiple steel-concrete composite sections can also be connected to form a whole transversely connected steel-concrete composite beam section in the transverse bridge upward direction. Utility Model Content

[0010] The utility model provides an assembled steel-concrete composite beam section with R-UHPC transverse connection. By arranging steel-concrete composite sections, longitudinal bridge prestressed steel strands, R-UHPC wet joint units, connecting plate units, and transverse bridge prestressed steel strands on the concrete section, all the steel-concrete composite sections arranged in the transverse bridge direction can be connected as a whole, thereby obtaining sufficient installation stability on the concrete section.

[0011] The technical solution adopted by the present invention to solve the above-mentioned problems is: an R-UHPC transversely connected prefabricated steel-concrete composite beam section, the structure of which includes a concrete section, a plurality of steel-concrete composite sections arranged in the transverse bridge direction, and prestressed steel strands in the longitudinal bridge direction, and also includes an R-UHPC wet joint unit arranged between two adjacent steel-concrete composite sections, a connecting plate unit arranged at the upper and lower sides of the R-UHPC wet joint unit, and a transverse bridge prestressed steel strand arranged on all the concrete sections and passing through the R-UHPC wet joint units.

[0012] A further preferred technical solution is that the R-UHPC wet joint unit includes embedded steel bars arranged on the side of the steel-concrete joint section, and a UHPC cast-in-place block arranged between two adjacent steel-concrete joint sections and containing the embedded steel bars.

[0013] A further preferred technical solution is that the R-UHPC wet joint unit further includes a protruding block arranged on the side of the steel-concrete joint section and located within the UHPC cast-in-place block.

[0014] A further preferred technical solution is that a reserved groove for arranging the UHPC cast-in-place block is further provided on the longitudinal bridge end surface of the concrete segment.

[0015] A further preferred technical solution is that the connecting plate unit includes a bottom formwork arranged on the lower surfaces of two adjacent steel-concrete combined sections, and a top cover plate arranged on the upper surfaces of two adjacent steel-concrete combined sections.

[0016] A further preferred technical solution is that the end of the bottom formwork is arranged on the lower surface of the concrete segment.

[0017] A further preferred technical solution is that the transverse bridge dimension of the top cover plate is larger than that of the bottom template.

[0018] A further preferred technical solution is that: the two steel-concrete joint sections at the side positions are also provided with prestressed anchor heads for tensioning the transverse bridge prestressed steel strands.

[0019] A further preferred technical solution is that the number of the transverse bridge prestressed steel strands is two rows.

[0020] A further preferred technical solution is that: the reserved groove is further provided with auxiliary steel bars for connecting the UHPC cast-in-place blocks. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic structural diagram of the present invention from a top view.

[0022] Figure 2 This is a schematic diagram of the positions of the transverse bridge prestressed steel strands and the longitudinal bridge prestressed steel strands in the present invention from a top-down perspective.

[0023] Figure 3 It is a schematic diagram of the position structure of the connecting plate unit in the present invention on the transverse bridge section.

[0024] Figure 4 This is a schematic diagram of the position structure of the R-UHPC wet joint unit in the present invention.

[0025] Figure 5 This is a schematic diagram of a transverse cross-sectional shape of the concrete section in the present utility model.

[0026] Figure 6 This is a schematic diagram of the position and shape of the reserved groove in the present invention when viewed from a top view.

[0027] Figure 7 This is a schematic diagram of the shape of the reserved groove in the utility model, which is also a tooth-shaped structure.

[0028] Figure 8 This is a schematic diagram of the structure of the steel-concrete combined section in the utility model.

[0029] In the figure, the meanings of the marks are as follows:

[0030] Concrete section 11, steel-concrete composite section 12, longitudinal prestressed steel strands 13;

[0031] R-UHPC wet joint unit 1, connection plate unit 2, transverse bridge prestressed steel strand 3, reserved groove 4, prestressed anchor head 5, auxiliary steel bar 6;

[0032] Embedded steel bars 101 , UHPC cast-in-place blocks 102 , protruding blocks 103 , bottom formwork 201 , and top cover plate 202 . DETAILED DESCRIPTION

[0033] The following description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the present invention.

[0034] As attached Figure 1-8 As shown, an R-UHPC transversely connected prefabricated steel-concrete composite beam section comprises a concrete section 11, a plurality of steel-concrete composite sections 12 arranged in a transverse bridge direction, and a longitudinal bridge direction prestressed steel strand 13. The section also comprises an R-UHPC wet joint unit 1 arranged between two adjacent steel-concrete composite sections 12, a connecting plate unit 2 arranged at the upper and lower sides of the R-UHPC wet joint unit 1, and a transverse bridge direction prestressed steel strand 3 arranged on all the concrete sections 11 and passing through the R-UHPC wet joint unit 1.

[0035] In this embodiment, the number of the concrete segment 11 is 1, and the number of the steel-concrete combination segments 12 is 2-4.

[0036] The combination of the R-UHPC wet joint unit 1, the connection plate unit 2 and the transverse bridge prestressed steel strands 3 enables all the prefabricated and assembled steel-concrete combined sections 12 to be connected into a whole with high strength, achieving the bridge strength required for a long-span steel-concrete combined beam cable-stayed bridge.

[0037] On the contrary, the above-mentioned "combining parts into a whole" connection method allows the original plan that requires prefabricating a whole steel-concrete joint section of a wider size to be improved to prefabricating 2-4 steel-concrete joint sections of a narrower size. This can greatly reduce the difficulty of prefabrication in the factory and the difficulty of transporting the steel-concrete joint sections.

[0038] Finally, the method of tightening the concrete section 11 and the steel-concrete combined section 12 in the longitudinal bridge direction prestressed steel strands 13 is the existing technology. The longitudinal bridge direction prestressed steel strands 13 are distributed as evenly as possible on the transverse bridge section of the concrete section 11 to ensure a high-stability longitudinal bridge connection effect with sufficient strength and as large an effective connection area as possible.

[0039] The R-UHPC wet joint unit 1 includes embedded steel bars 101 arranged on the side of the steel-concrete joint section 12, and a UHPC cast-in-place block 102 arranged between two adjacent steel-concrete joint sections 12 and containing the embedded steel bars 101.

[0040] In the existing technology, the "R" in the R-UHPC structure refers to steel bars, and the "UHPC" refers to ultra-high performance concrete.

[0041] In this embodiment, the embedded steel bars 101 are placed in the outer concrete area of the steel-concrete joint section 12. The UHPC cast-in-place blocks 102 are poured starting at the level of the lower surface of the steel-concrete joint section 12 and continuing until they reach the level of the upper surface of the steel-concrete joint section 12. The longitudinal length of the UHPC cast-in-place blocks 102 is set as needed and is generally greater than or equal to the longitudinal length of the steel-concrete joint section 12.

[0042] The R-UHPC wet joint unit 1 further includes a protruding block 103 disposed on a side of the steel-concrete joint section 12 and located within the UHPC cast-in-place block 102 .

[0043] In this embodiment, the protruding block 103 may be continuous in the longitudinal bridge direction, and a plurality of protruding blocks 103 are provided in the vertical direction, corresponding to the tooth joint structure in the prior art.

[0044] In addition, the structure of the steel-concrete combined section 12 is shown in the attached Figure 8 The structure primarily consists of two inner and outer steel rings, as well as three concrete structures within the inner steel ring, between the inner and outer steel rings, and on one side of the wet joint. The concrete structures on the wet joint side are precisely what makes the protruding blocks 103 so effective. In other words, the protruding blocks 103 and the concrete structures on the wet joint side are cast and cured together.

[0045] On the other hand, the embedded steel bar 101 is arranged on the concrete structure on one side of the wet joint. The embedded steel bar 101 is arranged horizontally, and one end thereof located in the concrete is welded to the outer ring steel structure, thereby improving the structural strength of the R-UHPC wet joint unit 1 and the entire steel-concrete joint section.

[0046] A reserved groove 4 for arranging the UHPC cast-in-place block 102 is further provided on the longitudinal bridge end surface of the concrete segment 11 .

[0047] In this embodiment, the transverse bridge position of the reserved groove 4 corresponds to the wet joint position reserved between the two adjacent steel-concrete combined sections 12, ultimately ensuring that the UHPC cast-in-place block 102 can connect the two adjacent steel-concrete combined sections 12 and the concrete section 11 together.

[0048] At this time, the R-UHPC wet joint unit 1 can not only connect the steel-concrete combined section 12 in the transverse bridge direction, but also connect the concrete section 11 and the steel-concrete combined section 12 in the longitudinal bridge direction, that is, the R-UHPC wet joint unit 1 can also serve as an auxiliary structure of the longitudinal bridge direction prestressed steel strands 13, and the two together reinforce the longitudinal bridge direction structure of the large-span steel-concrete combined beam cable-stayed bridge.

[0049] The connecting plate unit 2 includes a bottom formwork 201 provided on the lower surfaces of two adjacent steel-concrete combined sections 12 , and a top cover plate 202 provided on the upper surfaces of two adjacent steel-concrete combined sections 12 .

[0050] In this embodiment, the word "formwork" of the bottom formwork 201 refers to that one of its functions is to serve as a concrete support base plate when the UHPC cast-in-place block 102 is cast and formed, thereby eliminating the need for additional support formwork, which is very convenient.

[0051] The bottom formwork 201 and top cover plate 202 are both steel plates, welded and / or bolted to the outer steel structure of the steel-concrete joint section 12. Furthermore, the longitudinal length of the bottom formwork 201 and top cover plate 202 is at least greater than that of the UHPC cast-in-place block 102, ensuring complete coverage of the vertically centered cast-in-place concrete structure.

[0052] The end of the bottom formwork 201 is located on the lower surface of the concrete segment 11 .

[0053] In this embodiment, the end of the bottom formwork 201 is screwed to the lower surface of the concrete segment 11. That is, at this end in the longitudinal direction of the bridge, the UHPC cast-in-place block 102 is more protruding than the steel-concrete combined segment 12, and the bottom formwork 201 is more protruding than the UHPC cast-in-place block 102, ultimately resulting in:

[0054] 1. The bottom formwork 201 can more fully support the concrete required for casting the UHPC cast-in-place block 102, thereby preventing the concrete from leaking downwards;

[0055] 2. The bottom formwork 201 becomes the third longitudinal bridge reinforcement connection position after the longitudinal bridge prestressed steel strands 13 and the UHPC cast-in-place blocks 102 , connecting the concrete section 11 and the steel-concrete combined section 12 .

[0056] The transverse dimension of the top cover plate 202 is larger than that of the bottom template 201 .

[0057] In this embodiment, the top cover plate 202 is wider than the bottom formwork 201 in order to more fully cover and protect the UHPC cast-in-place block 102 .

[0058] The end of the top cover plate 202 may or may not be connected to the upper surface of the concrete segment 11. Therefore, the longitudinal length relationship between the top cover plate 202 and the bottom formwork 201 is not fixed.

[0059] The two steel-concrete joint sections 12 at the side positions are further provided with prestressed anchoring heads 5 for tensioning the transverse bridge prestressed steel strands 3 .

[0060] In this embodiment, the prestressed anchor head 5 is a commercially available product, which is arranged on the outer ring steel structure of the steel-concrete joint section 12. The prestressed steel strand 3 in the transverse bridge direction can be tensioned by post-tensioning, thereby reinforcing all the steel-concrete joint sections 12 connected upward in the transverse bridge direction.

[0061] Among them, the post-tensioning method of using the transverse bridge prestressed steel strands 3 in conjunction with the prestressed anchor heads 5 is carried out in accordance with existing process requirements. For example, after the UHPC cast-in-place blocks 102 reach 75% of the design strength, the transverse bridge prestressed steel strands 3 are tensioned to form a prestressed steel-concrete composite structure.

[0062] The number of the transverse bridge prestressed steel strands 3 is two rows.

[0063] In this embodiment, the length direction of the transverse bridge prestressed steel strands 3 is generally transverse, and the arrangement direction is longitudinal. There are two rows in total, and the number of strands in each row ranges from a dozen to dozens, or even hundreds.

[0064] The two upper and lower groups of transverse bridge prestressed steel strands 3 are located between the inner and outer ring steel structures of the steel-concrete combined section 12. The steel structure and concrete structure of the steel-concrete combined section 12 are both provided with channels for the transverse bridge prestressed steel strands 3. For details, please refer to the attached Figure 8 .

[0065] Among them, all the transverse bridge prestressed steel strands 3 pass through all the R-UHPC wet joint units 1.

[0066] The reserved groove 4 is also provided with auxiliary steel bars 6 for connecting the UHPC cast-in-place blocks 102 .

[0067] In this embodiment, the function of the auxiliary steel bars 6 is the same as that of the embedded steel bars 101 , and the auxiliary steel bars 6 can also be connected to the steel mesh cage inside the concrete segment 11 .

[0068] On the other hand, a protruding structure having the same function as the protruding block 103 can be further provided on the reserved groove 4 to also form a tooth joint structure, thereby directly increasing the connection strength between the concrete segment 11 and the UHPC cast-in-place block 102, and ultimately strengthening the connection between the concrete segment 11 and the steel-concrete combined segment 12.

[0069] While the embodiments of the present invention have been described in detail above with reference to the accompanying drawings, the present invention is not limited to the embodiments described above. Various modifications are possible within the scope of knowledge possessed by a person skilled in the art without departing from the spirit of the present invention. These modifications are non-inventive and are protected by patent law as long as they fall within the scope of the claims of the present invention.

Claims

1. An R-UHPC transversely connected assembled steel-concrete composite beam segment, comprising a concrete segment (11), a plurality of steel-concrete composite segments (12) arranged transversely to the bridge, and prestressed steel strands (13) arranged longitudinally to the bridge, characterized in that: It also includes an R-UHPC wet joint unit (1) arranged between two adjacent steel-concrete combined sections (12), a connecting plate unit (2) arranged at upper and lower sides of the R-UHPC wet joint unit (1), and a transverse bridge prestressed steel strand (3) arranged on all the concrete sections (11) and passing through the R-UHPC wet joint unit (1).

2. The R-UHPC transversely connected prefabricated steel-concrete composite beam segment according to claim 1, characterized in that: The R-UHPC wet joint unit (1) comprises embedded steel bars (101) arranged on the side of the steel-concrete joint section (12), and a UHPC cast-in-place block (102) arranged between two adjacent steel-concrete joint sections (12) and comprising the embedded steel bars (101).

3. The R-UHPC transversely connected prefabricated steel-concrete composite beam segment according to claim 2, characterized in that: The R-UHPC wet joint unit (1) further comprises a protruding block (103) arranged on a side of the steel-concrete joint section (12) and located within the UHPC cast-in-place block (102).

4. The R-UHPC transversely connected prefabricated steel-concrete composite beam segment according to claim 2, characterized in that: A reserved groove (4) for arranging the UHPC cast-in-place block (102) is also provided on the longitudinal bridge end surface of the concrete segment (11).

5. The R-UHPC transversely connected prefabricated steel-concrete composite beam segment according to claim 1, characterized in that: The connecting plate unit (2) comprises a bottom template (201) provided on the lower surface of two adjacent steel-concrete combined sections (12), and a top cover plate (202) provided on the upper surface of two adjacent steel-concrete combined sections (12).

6. The R-UHPC transversely connected prefabricated steel-concrete composite beam segment according to claim 5, characterized in that: The end position of the bottom formwork (201) is arranged on the lower surface of the concrete segment (11).

7. The R-UHPC transversely connected prefabricated steel-concrete composite beam segment according to claim 5, characterized in that: The transverse dimension of the top cover plate (202) is larger than that of the bottom template (201).

8. The R-UHPC transversely connected prefabricated steel-concrete composite beam segment according to claim 1, characterized in that: Prestressed anchoring heads (5) for tensioning the transverse bridge prestressed steel strands (3) are also provided on the two steel-concrete combined sections (12) at the side positions.

9. The R-UHPC transversely connected prefabricated steel-concrete composite beam segment according to claim 1, characterized in that: The number of the transverse bridge prestressed steel strands (3) is two rows.

10. The R-UHPC transversely connected prefabricated steel-concrete composite beam segment according to claim 4, characterized in that: Auxiliary steel bars (6) for connecting the UHPC cast-in-place blocks (102) are also provided on the reserved groove (4).

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