U-shaped steel pouring jacket composite beam bridge deck slab widening structure

Abstract

The utility model relates to the field of bridge reconstruction and expansion in bridge engineering, in particular to a U-shaped steel pouring jacket composite beam bridge deck slab widening structure. The problems of insufficient beam length and insufficient bearing capacity when the bridge floor of the tied-arch bridge is widened are solved. The widening structure is subjected to widening transformation based on an original bridge end cross beam, an original middle cross beam and an original bridge deck slab, the widening steel cross beam is composed of a U-shaped steel sleeve box and an I-shaped steel cross beam, the steel cross beam is longitudinally connected through an I-shaped steel longitudinal beam to form a beam lattice system, and the composite beam is formed by post-pouring of the U-shaped steel sleeve box cross beam, the U-shaped steel sleeve box longitudinal beam and the prefabricated bridge deck slab. Anchoring of lengthening of the cross beams is achieved through the U-shaped steel sleeve boxes, combination with the bridge deck is enhanced through a beam lattice system formed by the steel longitudinal beams and the cross beams, and the bridge deck widening structure which is small in self weight and good in overall performance is formed.

Description

Technical Field

[0001] The utility model relates to the field of bridge reconstruction and expansion of bridge engineering, in particular to a U-shaped steel box composite beam bridge deck widening structure. Background Art

[0002] Mid-span and bottom-span arch bridges are widely used in railway and highway projects. With the continuous increase in highway traffic volume, many in-service bridges have failed to meet current traffic demands due to low design standards and insufficient lane width. On the one hand, the economic cost of bridge reconstruction is high, and on the other hand, the bridge reconstruction process faces great traffic pressure. By widening and splicing, increasing the width of the bridge deck can reduce project investment while meeting existing traffic volume, becoming the preferred solution for highway bridge reconstruction and expansion projects.

[0003] However, in traditional reconstruction design, cast-in-place concrete is mainly used to widen the arch bridge beam, and a concrete bridge deck is set on it to widen the existing bridge. However, traditional widening technology still has some problems: (1) The cast-in-place concrete widening beam is heavy; (2) There is a lack of connection measures at the junction of the new and old concrete, and the connection is poor; (3) The construction is difficult and it is difficult to set up the formwork; (4) The reconstruction period is long, which affects traffic. Utility Model Content

[0004] The utility model provides a U-shaped steel box composite beam bridge deck structure for bridge deck widening, which reduces the deadweight of the widening crossbeam, effectively solves the problem of insufficient crossbeam length and bearing capacity when the bridge deck is widened, and can make up for the defects of high cost, heavy deadweight, complex construction process and long construction period of the conventional bridge deck widening and reconstruction scheme. The U-shaped steel box composite beam bridge deck structure for bridge deck widening of the present application is provided by arranging U-shaped steel boxes on the original bridge crossbeams, connecting them with the widening steel crossbeams, arranging steel longitudinal beams between the steel crossbeams, connecting them to each other to form a longitudinal and transverse beam system, arranging precast concrete bridge decks on the longitudinal and transverse beams, forming a longitudinal and transverse beam system composite bridge deck, thereby achieving the purpose of bridge deck widening.

[0005] The technical solution of the utility model is as follows:

[0006] A U-shaped steel box composite beam bridge deck widening structure, the widening structure is installed and widened based on the original bridge end beam 1, the original bridge middle beam 2, and the 1# original bridge deck 8-1 and the 2# original bridge deck 8-2, characterized in that the widening structure includes:

[0007] Widen the concrete cross beam 3, wherein the widened concrete cross beam 3 is connected to the original bridge end cross beam 1 by a 1# U-shaped steel casing 6-1 and a steel belt 10 through anchor bolts 11;

[0008] Widen the steel cross beam 4, wherein the widened steel cross beam 4 is connected to the original bridge middle cross beam 2 by a 2# U-shaped steel casing 6-2 and a steel belt 10 through an anchor bolt 11;

[0009] 1# steel longitudinal beam 5-1 and 2# steel longitudinal beam 5-2, wherein the 1# steel longitudinal beam 5-1 and 2# steel longitudinal beam 5-2 are connected to the widening steel cross beam 4 by bolts via a connecting steel plate 13;

[0010] A longitudinal beam joint 5-3, wherein the longitudinal beam joint 5-3 is connected to the 1# steel longitudinal beam 5-1 by a connecting steel plate 13 through bolts;

[0011] 1# prefabricated bridge deck 7-1, wherein the 1# prefabricated bridge deck 7-1 is arranged between the widened concrete cross beam 3 and the widened steel cross beam 4;

[0012] 2# prefabricated bridge deck 7-2, wherein the 2# prefabricated bridge deck 7-2 is arranged between the widened steel beams 4.

[0013] Furthermore, the widened steel beam 4 is composed of a widened steel beam top plate 4-1, a widened steel beam web plate 4-2 and a widened steel beam bottom plate 4-3, and a widened steel beam stiffening rib 4-4 is arranged on the widened steel beam web plate 4-2.

[0014] Furthermore, the 1# U-shaped steel casing 6-1 is welded by a 1# steel casing web 6-1-1 and a 1# steel casing bottom plate 6-1-2.

[0015] Furthermore, the 2# U-shaped steel casing 6-2 is welded together by a 2# steel casing top plate 6-2-1, a 2# steel casing web plate 6-2-2, a 2# steel casing bottom plate 6-2-3 and a 2# steel casing end plate 6-2-4. The 2# U-shaped steel casing 6-2 is mounted on the end of the original bridge center beam 2 through anchor bolts 11, and longitudinal and transverse stiffening ribs 6-2-5 are arranged on the outer side of the 2# steel casing end plate 6-2-4.

[0016] Furthermore, the longitudinal beam joint 5-3 is composed of a joint end plate 5-3-1, a joint top plate 5-3-2 and a joint web 5-3-3. Shear nails 12 are arranged on the joint end plate 5-3-1 and the joint top plate 5-3-2 and are embedded in the widened concrete beam 3.

[0017] Furthermore, shear nails 12 are set on the top surfaces of the widened steel crossbeam top plate 4-1, 1# steel longitudinal beam 5-1, and 2# steel longitudinal beam 5-2, and the 1# prefabricated bridge deck 7-1 is connected with the 1# steel longitudinal beam 5-1 and 1# U-shaped steel casing 6-1 through the wet joint 9, and the 2# prefabricated bridge deck 7-2 is connected with the 2# steel longitudinal beam 5-2 and 2# U-shaped steel casing 6-2 through the wet joint 9 to form a combined bridge deck.

[0018] Furthermore, wet joints 9 are formed between the 1# precast bridge deck 7-1 and the widened concrete cross beam 3, between the 1# precast bridge deck 7-1 and the 1# original bridge deck 8-1, between the 2# precast bridge deck 7-2, between the 2# precast bridge deck 7-2 and the 2# original bridge deck 8-2, and between the 1# steel longitudinal beam 5-1 and the 2# steel longitudinal beam 5-2, and UHPC is poured in the wet joints 9 to form a composite bridge deck of the longitudinal and transverse beam system.

[0019] The beneficial effects of the utility model are as follows: first, the structure has a light deadweight, and compared with the traditional transformation scheme, the deadweight load is reduced;

[0020] Second, a U-shaped steel box was installed at the end of the original bridge beam to connect with the widened beam to enhance the reliability of the connection between the new and old structures;

[0021] Third, the widened part of the bridge deck, longitudinal beams and transverse beams are all prefabricated structures, which greatly shortens the construction period, reduces construction difficulty and lowers project investment.

[0022] Fourth, UHPC materials with ultra-high compressive strength are placed at the connection of the bridge deck, which not only connects the prefabricated bridge deck of the widened part with the longitudinal and transverse beams to coordinate the force, but also strengthens the integrity of the original bridge deck and the widened bridge deck, and optimizes the overall force performance of the bridge deck after widening.

[0023] In summary, the combined bridge deck of the present application optimizes the overall stress form of the bridge after the widening of the deck of the mid-span and bottom-span arch bridges, shortens the construction period, reduces the construction difficulty, and enables the structure to have good stress performance and certain economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1-a This is the longitudinal section of the original bridge;

[0025] Figure 1-b To widen the longitudinal section of the structure;

[0026] Figure 1-c To widen the structural plan;

[0027] Figure 2-a This is a schematic diagram of the widening of the end beam;

[0028] Figure 2-b Widen the cross-section view for the end beam;

[0029] Figure 3-a This is a schematic diagram of widening the middle beam;

[0030] Figure 3-b To widen the top plan of the middle beam;

[0031] Figure 3-c To widen the bottom plan of the middle beam;

[0032] Figure 3-dPaste the steel strip plan drawing on the top of the middle cross beam;

[0033] Figure 4 This is a structural diagram of 1# steel longitudinal beam 5-1;

[0034] Figure 5 This is a schematic diagram of the 2# steel longitudinal beam structure;

[0035] As shown in the figure: original bridge end beam 1, original bridge middle beam 2, widened concrete beam 3, widened steel beam 4, widened steel beam top plate 4-1, widened steel beam web 4-2, widened steel beam bottom plate 4-3, widened steel beam stiffening rib 4-4, 1# steel longitudinal beam 5-1, 2# steel longitudinal beam 5-2, longitudinal beam joint 5-3, joint end plate 5-3-1, joint top plate 5-3-2, joint web 5-3-3, 1# U-shaped steel casing 6-1, 1# steel casing web 6-1-1, 1# steel casing bottom plate 6-1-2, 2# U-shaped steel casing 6-2, 2# steel casing top plate 6-2-1, 2# steel casing web plate 6-2-2, 2# steel casing bottom plate 6-2-3, 2# steel casing end plate 6-2-4, 2# steel casing stiffening rib 6-2-5, 1# precast bridge deck 7-1, 2# precast bridge deck 7-2, 1# original bridge deck 8-1, 2# original bridge deck 8-2, wet joint 9, steel belt 10, anchor bolt 11, shear nail 12, connecting steel plate 13. DETAILED DESCRIPTION

[0036] The technical solution of the utility model is further described below with reference to the accompanying drawings and through specific embodiments:

[0037] Example 1

[0038] As shown Figure 1-a , Figure 1-b and Figure 1-c As shown, the utility model provides a U-shaped steel box composite beam bridge deck structure for widening a bridge deck, including a widening concrete cross beam 3, a widening steel cross beam 4, a 1# steel longitudinal beam 5-1, a 2# steel longitudinal beam 5-2, a longitudinal beam joint 5-3, a 1# U-shaped steel box 6-1, a 2# U-shaped steel box 6-2, a 1# prefabricated bridge deck 7-1, and a 2# prefabricated bridge deck 7-2.

[0039] The widened concrete beam 3 is connected to the original bridge end beam 1 by the 1# U-shaped steel casing 6-1 and the steel belt 10. The widened steel beam 4 is connected to the original bridge middle beam 2 by the 2# U-shaped steel casing 6-2 and the steel belt 10. The longitudinal beam joint 5-3 is embedded in the widened concrete beam 3, and the 1# steel longitudinal beam 5-1 and the longitudinal beam joint 5-3, the 1# steel longitudinal beam 5-1 and the widened steel beam 4, and the widened steel beam 4 and the 2# steel longitudinal beam 5-2 are all connected by connecting steel plates 13 to form a longitudinal and transverse beam system. The 1# precast bridge deck 7-1 and the 2# precast bridge deck 7-2 form a combined bridge deck with the longitudinal and transverse beams through the wet joints 9, and the 1# precast bridge deck 7-1 and the 2# precast bridge deck 7-2 are connected to the original bridge deck through the wet joints 9 to form a whole.

[0040] like Figure 2-a , Figure 2-b As shown, the 1# U-shaped steel casing 6-1 is welded by the 1# steel casing web 6-1-1 and the bottom plate 6-1-2, and the widened concrete beam 3 is connected to the original bridge end beam 1 by the 1# U-shaped steel casing 6-1 and the top steel belt 10 through the anchor bolts 11.

[0041] like Figure 3-a , Figure 3-b , Figure 3-c , Figure 3-d As shown, the widened steel beam top plate 4-1, the widened steel beam web plate 4-2 and the widened steel beam bottom plate 4-3 constitute the steel beam 4, the widened steel beam stiffening rib 4-4 is arranged on the widened steel beam web plate 4-2, and the widened steel beam 4 is connected to the original bridge center beam 2 by a 2# U-shaped steel casing 6-2 and a top steel belt 10 through anchor bolts 11.

[0042] like Figure 3-a , Figure 3-b , Figure 3-c , Figure 3-d As shown, the 2# U-shaped steel casing 6-2 is welded together by a 2# steel casing top plate 6-2-1, a 2# steel casing web plate 6-2-2, a 2# steel casing bottom plate 6-2-3 and a 2# steel casing end plate 6-2-4. The 2# U-shaped steel casing 6-2 is sleeved on the end of the original bridge center beam 2 by anchor bolts 11, and longitudinal and transverse 2# steel casing stiffening ribs 6-2-5 are arranged on the outer side of the 2# steel casing end plate 6-2-4.

[0043] like Figure 4 , Figure 5 As shown, the longitudinal beam joint 5-3 is composed of a joint end plate 5-3-1, a joint top plate 5-3-2 and a joint web 5-3-3. Shear nails 12 are arranged on the joint end plate 5-3-1 and the joint top plate 5-3-2, and are embedded in the widened concrete beam 3; the 1# steel longitudinal beam 5-1 and the longitudinal beam joint 5-3, the 1# steel longitudinal beam 5-1 and the steel cross beam 4, and the steel cross beam 4 and the 2# steel longitudinal beam 5-2 are all connected by connecting steel plates 13 through bolts.

[0044] The specific construction method is:

[0045] According to the size and stress conditions of the original bridge beam, the sizes of the steel beam 4, 1# steel longitudinal beam 5-1, 2# steel longitudinal beam 5-2, longitudinal beam joint 5-3, 1# U-shaped steel casing 6-1, and 2# U-shaped steel casing 6-2 are determined, and the above steel components are prefabricated in the factory. According to the size and installation position of the steel beam and steel longitudinal beam, the sizes of the 1# prefabricated bridge deck 7-1 and the 2# prefabricated bridge deck 7-2 are determined, and the bridge deck is prefabricated in the factory. The prefabricated 1# U-shaped steel casing 6-1 is anchored to the end of the original bridge end beam 1 through anchor bolts 7, and the 1# U-shaped steel casing 6-1 is anchored to the end of the original bridge middle beam 2 through anchor bolts 7. After the longitudinal beam joint 5-3 is embedded, the widened concrete end beam 3 is poured on site, and the steel beam 4 and the 2# U-shaped steel casing 6-2 are welded at the same time. After the widening of the cross beam is completed, the crane is used to symmetrically hoist the 1# steel longitudinal beams 5-1 and 5-2, and the cross beams and longitudinal beams are connected to each other with connecting steel plates 13. After the longitudinal and transverse beams are formed, the crane is used to hoist the 1# prefabricated bridge deck 7-1 and the 2# prefabricated bridge deck 7-2. Before hoisting, the concrete part of the 1# original bridge deck 8-1 and the 2# original bridge deck 8-2 is chiseled out to expose the bridge deck steel bars, which are connected with the prefabricated bridge deck steel bars. The bridge deck is laid on the longitudinal and transverse beams by the crane, so that the shear nails 12 are placed in the groove of the wet joint 9. After the bridge deck of the entire bridge is accurately positioned and installed, UHPC is poured in the wet joint 9 to seal the mouth and realize the widening of the bridge deck.

[0046] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention.

[0047] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A U-shaped steel box composite beam bridge deck widening structure, the widening structure is based on the original bridge end beam, the original bridge middle beam and the 1# original bridge deck and the 2# original bridge deck installation widening, characterized in that: The widening structure comprises: Widen the concrete beam, wherein the widened concrete beam is connected to the original bridge end beam by a 1# U-shaped steel casing and a steel belt through anchor bolts; Widen the steel cross beam, wherein the widened steel cross beam is connected to the original bridge middle cross beam through a 2# U-shaped steel casing and a steel belt through anchor bolts; 1# steel longitudinal beam and 2# steel longitudinal beam, wherein the 1# steel longitudinal beam and 2# steel longitudinal beam are connected to the widened steel cross beam by connecting steel plates through bolts; A longitudinal beam joint, wherein the longitudinal beam joint is connected to the 1# steel longitudinal beam by a connecting steel plate through bolts; 1# prefabricated bridge deck, the 1# prefabricated bridge deck is arranged between the widened concrete beam and the widened steel beam; 2# prefabricated bridge deck, wherein the 2# prefabricated bridge deck is arranged between the widened steel beams.

2. The U-shaped steel box composite beam bridge deck widening structure according to claim 1 is characterized by: The widened steel beam is composed of a widened steel beam top plate, a widened steel beam web plate and a widened steel beam bottom plate, and the widened steel beam web plate is provided with widened steel beam stiffening ribs.

3. The U-shaped steel box composite beam bridge deck widening structure according to claim 1 is characterized by: The 1# U-shaped steel casing is formed by welding a 1# steel casing web and a 1# steel casing bottom plate.

4. The U-shaped steel box composite beam bridge deck widening structure according to claim 1 is characterized by: The 2# U-shaped steel box is welded together by a 2# steel box top plate, a 2# steel box web plate, a 2# steel box bottom plate and a 2# steel box end plate. The 2# U-shaped steel box is sleeved on the end of the original bridge center beam through anchor bolts, and longitudinal and transverse stiffening ribs are arranged on the outer side of the 2# steel box end plate.

5. The U-shaped steel box composite beam bridge deck widening structure according to claim 1 is characterized by: The longitudinal beam joint is composed of a joint end plate, a joint top plate and a joint web plate. Shear nails are arranged on the joint end plate and the joint top plate and are pre-embedded in the widened concrete beam.

6. The U-shaped steel box composite beam bridge deck widening structure according to claim 2 is characterized by: Shear nails (12) are arranged on the top surfaces of the widened steel cross beam top plate 4-1, the 1# steel longitudinal beam 5-1 and the 2# steel longitudinal beam 5-2, and the 1# prefabricated bridge deck 7-1 is connected with the 1# steel longitudinal beam 5-1 and the 1# U-shaped steel casing 6-1 through a wet joint (9), and the 2# prefabricated bridge deck 7-2 is connected with the 2# steel longitudinal beam 5-2 and the 2# U-shaped steel casing 6-2 through a wet joint (9) to form a combined bridge deck.

7. The U-shaped steel box composite beam bridge deck widening structure according to claim 1 is characterized by: Wet joints are formed between the 1# precast bridge deck and the widened concrete cross beam, between the 1# precast bridge deck and the 1# original bridge deck, between the 2# precast bridge decks, between the 2# precast bridge decks and the 2# original bridge decks, and between the 1# steel longitudinal beam and the 2# steel longitudinal beam, and UHPC is poured in the wet joints to form a composite bridge deck of the longitudinal and transverse beam system.

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