A widened bridge adjacent new and old main beam diaphragm splicing structure

Abstract

The utility model relates to a kind of widening bridge adjacent new and old main beam diaphragm splicing structure, especially in bridge construction technical field.The utility model includes the steel-UHPC combined diaphragm of prior forming and the middle late UHPC of pouring in the steel-UHPC combined diaphragm of prior forming, give full play to the high tensile capacity of steel plate and reinforcing bar and the superhigh strength of UHPC, make existing bridge and expansion new bridge adjacent new and old main beam by diaphragm temporary splicing into whole, meet the diaphragm transverse tension and vertical shearing requirement after splicing, temporarily form weak vertical rigidity and lateral rigidity again, coordinate the larger transverse bridge deformation and vertical warping generated by concrete shrinkage and creep difference after splicing;Not only simple structure, reasonable in design, convenient construction, shorten splicing time, can be widely used in widening expansion project existing bridge and expansion new bridge adjacent new and old main beam diaphragm splicing, improve construction efficiency.

Description

Technical Field

[0001] This utility model relates to the field of bridge construction technology, and in particular to a structure for splicing transverse diaphragms of adjacent new and old main beams of a bridge. Background Technology

[0002] With the rapid growth of traffic volume in my country, the insufficient capacity of highways and urban roads has become increasingly prominent, necessitating urgent widening and reconstruction. When widening highways by widening both sides as a whole, the splicing of old and new bridges is crucial. The existing bridges have already completed concrete shrinkage and creep, while the new bridges have largely not yet completed this process. This difference in concrete shrinkage and creep at the splicing point means that the axial deformation of the new bridge will affect the deformation of the existing bridge. Therefore, the splicing of adjacent new and old main beams is often a key control point in widening and reconstruction projects. Furthermore, the foundation settlement of existing bridges has been completed after several years of operation, while foundation settlement of the new bridges is unavoidable during reconstruction. The difference in vertical deflection of the main beams caused by the foundation settlement of the new bridge will be constrained by the existing bridge, adversely affecting the stress on the spliced ​​structure. In most cases, to ensure that the existing bridge and the new bridge can be connected as a whole and share the load, several transverse diaphragms are installed between adjacent new and old main beams for connection. The aforementioned differences in transverse deformation and vertical deflection need to be coordinated through the deformation of the diaphragms. Therefore, the diaphragms between adjacent new and old main beams should have strong tensile strength and weak transverse and longitudinal stiffness to accommodate the aforementioned differences in transverse deformation and vertical deflection. Utility Model Content

[0003] (1) Technical solution This utility model provides a structure for widening the cross diaphragm splicing between adjacent new and old main beams of a bridge. It includes an integral steel-UHPC composite cross diaphragm structure for connecting adjacent newly constructed and existing main beams. The integral steel-UHPC composite cross diaphragm structure is a post-formed steel-UHPC composite cross diaphragm. The post-formed steel-UHPC composite cross diaphragm includes a pre-formed steel-UHPC composite cross diaphragm and a central post-formed UHPC poured into the pre-formed steel-UHPC composite cross diaphragm. The pre-formed steel-UHPC composite cross diaphragm includes a steel plate frame, internal ordinary reinforcing bars and internal fine-rolled threaded reinforcing bars set within the steel plate frame, and pre-formed UHPC poured between the outer walls of both sides of the steel plate frame and the new and existing main beams. The steel plate frame is assembled from a left steel plate, a right steel plate, a bottom steel plate, a front steel plate, and a rear steel plate.

[0004] Preferably, the internal ordinary reinforcing bars include a plurality of internal transverse reinforcing bars, internal vertical reinforcing bars, and internal shear reinforcing bars.

[0005] Preferably, several of the internal transverse reinforcing bars extend from the adjacent newly built main beams and existing main beams and penetrate transversely into the steel plate frame and are connected by butt welding.

[0006] Preferably, a plurality of internal shear-resistant reinforcing bars are vertically welded onto the bottom steel plate, the front steel plate, and the rear steel plate.

[0007] Preferably, the internal fine-rolled threaded steel bars extend from the adjacent newly built main beams and existing main beams and penetrate laterally into the steel plate frame, and are connected by threaded sleeves.

[0008] Preferably, a number of internal vertical reinforcing bars are vertically arranged inside the steel plate frame, and the vertical reinforcing bars are tied and fixed with the internal transverse reinforcing bars and the internal fine-rolled threaded reinforcing bars.

[0009] Preferably, both the left and right steel plates have a number of reserved holes for the internal transverse reinforcing bars and the internal fine-rolled threaded reinforcing bars to pass through, and the number and spacing of the reserved holes are consistent with the number and spacing of the internal transverse reinforcing bars and the internal fine-rolled threaded reinforcing bars.

[0010] Preferably, a left-side pre-casting zone is formed between the left-side steel plate, the bottom steel plate, the front steel plate, the rear steel plate, and the existing main beam; a right-side pre-casting zone is formed between the right-side steel plate, the bottom steel plate, the front steel plate, the rear steel plate, and the newly constructed main beam; and a central late-casting zone is formed between the left-side steel plate, the right-side steel plate, the bottom steel plate, the front steel plate, and the rear steel plate. The central late-casting zone is filled with the central late-casting UHPC. The pre-casting UHPC includes a left-side pre-casting UHPC and a right-side pre-casting UHPC. The left-side pre-casting zone is filled with the left-side pre-casting UHPC, and the right-side pre-casting zone is filled with the right-side pre-casting UHPC.

[0011] Preferably, the front steel plates corresponding to the left pre-grouting zone, the right pre-grouting zone, and the middle post-grouting zone, as well as the rear steel plate corresponding to the middle post-grouting zone, are all provided with grouting holes and grout outlet holes. The grouting holes are respectively located on the lower part of the front steel plate and the rear steel plate, and the grout outlet holes are respectively located on the upper part of the front steel plate and the rear steel plate.

[0012] A method for splicing transverse diaphragms of adjacent new and old main beams of a bridge, comprising the following steps: (1) Make the left side steel plate, right side steel plate, bottom steel plate, front side steel plate and rear side steel plate. The width and height of the left side steel plate, right side steel plate and bottom steel plate are consistent with the width and height of the transverse diaphragm in the design. The length and height of the front side steel plate and rear side steel plate are consistent with the length and height of the transverse diaphragm in the design. (2) Holes are reserved in both the left and right steel plates. The number and spacing of the reserved holes are consistent with the number and spacing of the internal transverse steel bars and the internal fine-rolled threaded steel bars. (3) Vertically weld internal shear reinforcement bars onto the bottom steel plate, front steel plate and rear steel plate; (4) The left and right steel plates pass through the internal transverse reinforcement bars to a distance from the corresponding side main beam; (5) Butt weld the internal transverse steel bars extending from the adjacent new main beam and the existing main beam, tension the internal fine-rolled threaded steel bars extending from the adjacent new main beam and the existing main beam and connect them with threaded sleeves, and tie the internal vertical steel bars. (6) Assemble the bottom steel plate, front steel plate and rear steel plate respectively, and weld them together with the left steel plate and right steel plate; (7) Grout the left-side pre-UHPC and the right-side pre-UHPC through the grouting holes of the front steel plate respectively; (8) After a period of time, the difference in concrete shrinkage and creep becomes smaller and the transverse deformation of the bridge ends, the intermediate and late-stage UHPC is injected through the grouting hole of the rear steel plate to form an integral steel-UHPC composite diaphragm structure.

[0013] (2) Beneficial effects This utility model proposes a diaphragm splicing structure for adjacent new and old main beams of bridges undergoing widening. Compared with existing technologies, this utility model has the following advantages: It fully utilizes the high tensile strength of steel plates and reinforcing bars and the ultra-high strength of UHPC (ultra-high-strength concrete), allowing adjacent new and old main beams of existing bridges and expanded bridges to be temporarily spliced ​​into a whole through diaphragms. This satisfies the requirements for lateral tension and vertical shear of the spliced ​​diaphragms, while temporarily creating relatively weak vertical and lateral stiffness to coordinate the large transverse deformation and vertical warping caused by the poor shrinkage and creep of concrete after splicing. After a period of time, when the difference in concrete shrinkage and creep decreases and the transverse deformation ends, the internal UHPC is then poured to form an integral steel-UHPC composite diaphragm structure. Furthermore, this utility model has a simple structure, reasonable design, and convenient construction, shortening the splicing time. It can be widely applied in the splicing of diaphragms between adjacent new and old main beams of existing bridges and expanded bridges in widening and expansion projects, improving construction efficiency. Attached Figure Description

[0014] Figure 1 This is a schematic cross-sectional view of the splicing structure of the new and old main beam transverse diaphragms in an embodiment of this utility model; Figure 2 This is a schematic diagram of the longitudinal section of the splicing structure of the new and old main beam transverse diaphragms in an embodiment of this utility model; Figure 3 This is a schematic elevation view of the splicing structure of the new and old main beam transverse diaphragms in an embodiment of this utility model; Figure 4This is a schematic diagram of the overall steel-UHPC combined diaphragm structure of an embodiment of the present utility model; Figure 5 This is a schematic diagram of the front steel plate structure of an embodiment of the present utility model; Figure 6 This is a schematic diagram of the rear steel plate structure according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the left steel plate structure in an embodiment of the present invention; Figure 8 This is a schematic diagram of the bottom steel plate structure according to an embodiment of the present invention; The attached diagram is labeled as follows: 1-Left side steel plate; 2-Right side steel plate; 3-Bottom steel plate; 4-Front side steel plate; 5-Rear side steel plate; 6-Internal ordinary reinforcing bars; 7-Internal fine-rolled threaded reinforcing bars; 8-Left side initial UHPC; 9-Right side initial UHPC; 10-Middle section later UHPC; 11-Reserved holes; 12-Left side initial grouting area; 13-Right side initial grouting area; 14-Middle section later grouting area; 51-Grouting hole; 52-Grouting outlet hole; 61-Internal transverse reinforcing bars; 62-Internal vertical reinforcing bars; 63-Internal shear reinforcing bars; 100-Integral steel-UHPC composite diaphragm structure; 101-Initially formed steel-UHPC composite diaphragm; 102-Later formed steel-UHPC composite diaphragm; 200-New main beam; 300-Existing main beam. Detailed Implementation

[0015] The present invention will be further described in conjunction with the accompanying drawings and embodiments.

[0016] like Figures 1-8 As shown, the present invention discloses a crossbeam splicing structure for widening adjacent new and old main beams of a bridge, comprising an integral steel-UHPC composite crossbeam structure 100 (a steel-UHPC composite structure formed in two stages) for connecting adjacent newly built main beams 200 and existing main beams 300. The integral steel-UHPC composite crossbeam structure 100 is a later-formed steel-UHPC composite crossbeam 102, which includes the earlier-formed steel-UHPC composite crossbeam 101 and... The pre-formed steel-UHPC composite diaphragm 101 contains a mid-stage UHPC 10. The pre-formed steel-UHPC composite diaphragm 101 includes a steel plate frame, internal ordinary steel bars 6 and internal fine-rolled threaded steel bars 7 set in the steel plate frame, and pre-formed UHPC poured between the outer walls of both sides of the steel plate frame and the newly built main beam 200 and the existing main beam 300. The steel plate frame is assembled from a left steel plate 1, a right steel plate 2, a bottom steel plate 3, a front steel plate 4, and a rear steel plate 5.

[0017] The internal ordinary steel reinforcement 6 includes several internal transverse steel reinforcements 61, internal vertical steel reinforcements 62, and internal shear steel reinforcements 63.

[0018] Several internal transverse reinforcing bars 61 extend from the adjacent newly built main beam 200 and existing main beam 300 and penetrate transversely into the steel plate frame and are connected by butt welding.

[0019] Several internal shear-resistant steel bars 63 are vertically welded to the bottom steel plate 3, the front steel plate 4, and the rear steel plate 5 to enhance the shear-resistant connection between the steel plates and the UHPC.

[0020] The internal fine-rolled threaded steel bars 7 extend from the adjacent newly built main beam 200 and existing main beam 300 and penetrate laterally into the steel plate frame and are connected by threaded sleeves.

[0021] Several internal vertical reinforcing bars 62 are vertically arranged inside the steel plate frame. The vertical reinforcing bars are tied and fixed together with the internal horizontal reinforcing bars 61 and the internal fine-rolled threaded reinforcing bars 7.

[0022] Both the left steel plate 1 and the right steel plate 2 have a number of reserved holes 11 for the internal transverse reinforcing bars 61 and the internal fine-rolled threaded reinforcing bars 7 to pass through. The number and spacing of the reserved holes 11 are consistent with the number and spacing of the internal transverse reinforcing bars 61 and the internal fine-rolled threaded reinforcing bars 7, which facilitates the insertion of the left steel plate 1 and the right steel plate 2.

[0023] The left-side steel plate 1, the bottom steel plate 3, the front steel plate 4, the rear steel plate 5, and the existing main beam 300 form a left-side pre-grouting zone 12. The right-side steel plate 2, the bottom steel plate 3, the front steel plate 4, the rear steel plate 5, and the newly built main beam 200 form a right-side pre-grouting zone 13. The left-side steel plate 1, the right-side steel plate 2, the bottom steel plate 3, the front steel plate 4, and the rear steel plate 5 form a middle-side post-grouting zone 14. The middle-side post-grouting zone 14 is filled with the middle-side post-grouting UHPC 10. The pre-grouting UHPC includes a left-side pre-grouting UHPC 8 and a right-side pre-grouting UHPC 9. The left-side pre-grouting zone 12 is filled with the left-side pre-grouting UHPC 8, and the right-side pre-grouting zone 13 is filled with the right-side pre-grouting UHPC 9.

[0024] Grouting holes 51 and grout outlet holes 52 are provided on the front steel plate 4 corresponding to the left pre-grouting zone 12, the right pre-grouting zone 13, and the middle post-grouting zone 14, and on the rear steel plate 5 corresponding to the middle post-grouting zone 14. The grouting holes 51 are respectively located on the lower part of the front steel plate 4 and the rear steel plate 5, and the grout outlet holes 52 are respectively located on the upper part of the front steel plate 4 and the rear steel plate 5.

[0025] A method for splicing transverse diaphragms of adjacent new and old main beams of a bridge, comprising the following steps: (1) Fabricate the left steel plate 1, right steel plate 2, bottom steel plate 3, front steel plate 4 and rear steel plate 5. The width and height of the left steel plate 1, right steel plate 2 and bottom steel plate 3 are consistent with the width and height of the transverse diaphragm in the design. The length and height of the front steel plate 4 and rear steel plate 5 are consistent with the length and height of the transverse diaphragm in the design. The length, width and height of the transverse diaphragm in the design are designed based on the spacing between the adjacent newly built main beam 200 and the existing main beam 300 and the beam height.

[0026] (2) Both the left steel plate 1 and the right steel plate 2 have reserved holes 11. The number and spacing of the reserved holes 11 are consistent with the number and spacing of the internal transverse steel bars 61 and the internal fine-rolled threaded steel bars 7. (3) Vertically weld internal shear reinforcement 63 onto the bottom steel plate 3, the front steel plate 4 and the rear steel plate 5; (4) The left steel plate 1 and the right steel plate 2 pass through the internal transverse steel bars 61 to a distance from the corresponding side main beam to form the left pre-pouring zone 127 and the right pre-pouring zone 138; (5) Butt weld the internal transverse steel bars 61 extending from the adjacent newly built main beam 200 and the existing main beam 300, tension the internal fine-rolled threaded steel bars 7 extending from the adjacent newly built main beam 200 and the existing main beam 300 and connect them with threaded sleeves, and tie the internal vertical steel bars 62. (6) Assemble the bottom steel plate 3, the front steel plate 4 and the rear steel plate 5 respectively, and weld them together with the left steel plate 1 and the right steel plate 2; (7) Grout the left-side pre-existing UHPC8 and the right-side pre-existing UHPC9 through the grouting hole 51 of the front steel plate 4 respectively; (8) After a period of time, the difference in concrete shrinkage and creep becomes smaller and the transverse deformation of the bridge ends, the intermediate and late-stage UHPC is injected through the grouting hole 51 of the rear steel plate 5 to form an integral steel-UHPC composite diaphragm structure 100.

[0027] The embodiments described above are merely preferred embodiments of the present invention, and are described in a relatively specific and detailed manner. However, the present invention is not limited to these embodiments. It should be noted that for those skilled in the art, any improvements made without departing from the spirit of the present invention fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A structure for splicing transverse diaphragms between adjacent old and new main beams of a bridge, characterized in that, The system includes an integral steel-UHPC composite diaphragm structure for connecting adjacent newly constructed main beams and existing main beams. The integral steel-UHPC composite diaphragm structure is a post-formed steel-UHPC composite diaphragm. The post-formed steel-UHPC composite diaphragm includes a pre-formed steel-UHPC composite diaphragm and a central post-formed UHPC poured into the pre-formed steel-UHPC composite diaphragm. The pre-formed steel-UHPC composite diaphragm includes a steel plate frame, internal ordinary steel bars and internal fine-rolled threaded steel bars set in the steel plate frame, and pre-formed UHPC poured between the outer walls of both sides of the steel plate frame and the newly constructed main beam and the existing main beam. The steel plate frame is assembled from a left steel plate, a right steel plate, a bottom steel plate, a front steel plate, and a rear steel plate.

2. The bridge diaphragm splicing structure for widening adjacent old and new main beams according to claim 1, characterized in that, The internal ordinary steel reinforcement includes several internal transverse steel bars, internal vertical steel bars, and internal shear steel bars.

3. The bridge diaphragm splicing structure for widening adjacent old and new main beams according to claim 2, characterized in that, Several internal transverse steel bars extend from the adjacent newly built main beams and existing main beams and penetrate transversely into the steel plate frame and are connected by butt welding.

4. The bridge diaphragm splicing structure for widening adjacent old and new main beams according to claim 2, characterized in that, Several internal shear-resistant steel bars are vertically welded onto the bottom steel plate, the front steel plate, and the rear steel plate.

5. The cross diaphragm splicing structure for widening adjacent old and new main beams of a bridge according to claim 2, characterized in that, The internal fine-rolled threaded steel bars extend from the adjacent newly built main beams and existing main beams and penetrate laterally into the steel plate frame, and are connected by threaded sleeves.

6. The bridge diaphragm splicing structure for widening adjacent old and new main beams according to claim 5, characterized in that, The steel plate frame has several internal vertical reinforcing bars, which are tied and fixed together with the internal horizontal reinforcing bars and the internal fine-rolled threaded reinforcing bars.

7. A bridge diaphragm splicing structure for widening adjacent old and new main beams according to claim 5, characterized in that, Both the left and right steel plates have a number of reserved holes for the internal transverse reinforcing bars and the internal fine-rolled threaded reinforcing bars to pass through. The number and spacing of the reserved holes are consistent with the number and spacing of the internal transverse reinforcing bars and the internal fine-rolled threaded reinforcing bars.

8. The bridge diaphragm splicing structure for widening adjacent old and new main beams according to claim 1, characterized in that, The left-side pre-casting zone is formed between the left-side steel plate, the bottom steel plate, the front steel plate, the rear steel plate, and the existing main beam. The right-side pre-casting zone is formed between the right-side steel plate, the bottom steel plate, the front steel plate, the rear steel plate, and the newly built main beam. The middle post-casting zone is formed between the left-side steel plate, the right-side steel plate, the bottom steel plate, the front steel plate, and the rear steel plate. The middle post-casting zone is filled with the middle post-casting UHPC. The pre-casting UHPC includes left-side pre-casting UHPC and right-side pre-casting UHPC. The left-side pre-casting zone is filled with the left-side pre-casting UHPC, and the right-side pre-casting zone is filled with the right-side pre-casting UHPC.

9. A bridge diaphragm splicing structure for widening adjacent old and new main beams according to claim 8, characterized in that, Grouting holes and grout outlet holes are provided on the front steel plates corresponding to the left pre-grouting zone, the right pre-grouting zone, and the middle post-grouting zone, as well as on the rear steel plate corresponding to the middle post-grouting zone. The grouting holes are respectively located on the lower part of the front steel plate and the rear steel plate, and the grout outlet holes are respectively located on the upper part of the front steel plate and the rear steel plate.

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