Prefabricated Steel-Concrete Hybrid Cantilever Structural System for Road Widening and Construction Method

Abstract

The present invention discloses a prefabricated steel-concrete hybrid cantilever structure system for road widening, which relates to the field of steel-concrete hybrid structures in road structures. It includes a cantilever cross beam, and the cantilever cross beam includes a first section of concrete precast block, a third section of concrete precast block, a second section of concrete precast block, and a plurality of steel member joint devices; steel member joint devices are arranged at both ends of the second section of concrete precast block; the first section of concrete precast block is connected to the steel member joint device at one end of the second section of concrete precast block, and the third section of concrete precast block is connected to the steel member joint device at the other end of the second section of concrete precast block. In the present invention, the cantilever cross beam is cut and precast in blocks, and the weight of each block after segmentation can be controlled as required, solving the problems of difficult selection of storage sites, transportation equipment, and hoisting equipment due to excessive weight and size. The present invention also relates to a construction method of this prefabricated steel-concrete hybrid cantilever structure system for road widening.

Description

Technical Field

[0001] The present invention relates to the field of steel-concrete hybrid structures in road structures, and more specifically, it is a prefabricated and assembled steel-concrete hybrid cantilever structure system for widening roads. The present invention also relates to a construction method for such a prefabricated and assembled steel-concrete hybrid cantilever structure system for widening roads. Background Art

[0002] In road widening projects, due to construction and terrain restrictions (such as a mountain on one side and a gully on the other side in mountainous areas; or a building on one side and a river on the other side of an urban road), it is very difficult to widen the road. Generally, a cantilever structure can be used to cantilever the sidewalk or the roadway; the cantilever structure solves problems such as difficult expansion, restricted flood discharge cross-section of the river, and difficult land expropriation and demolition, providing a very good solution for the increasingly demanding road widening projects.

[0003] However, the establishment of a cantilever structure system is another major problem: some solutions use the form of adding anchor cables at the root of the cantilever structure; some other solutions use larger and heavier cantilever beams; since the cantilever structure faces the problem of overturning during design, the greater the length of the outer cantilever section, the greater the cost paid for anti-overturning; using the form of adding anchor cables at the root of the cantilever structure requires good anchoring conditions provided by the embankment foundation, and the reliability and durability of the anchor cables both decrease continuously over time; using a larger beam can ensure reliability and durability, but an overly large beam will face the problem of having to use in-situ casting, which has a long construction period, or the problem of difficult transportation of overly heavy precast beams.

[0004] Therefore, it is necessary to develop a cantilever structure system with strong durability, simple on-site installation, reliable connection, capable of large-area standardized construction in segments, and fast construction speed. Summary of the Invention

[0005] The first object of the present invention is to overcome the deficiencies of the above background art, and provide a prefabricated and assembled steel-concrete hybrid cantilever structure system for widening roads.

[0006] The second object of the present invention is to provide a construction method for such a prefabricated and assembled steel-concrete hybrid cantilever structure system for widening roads.

[0007] To achieve the above first object, the technical solution of the present invention is: a prefabricated and assembled steel-concrete hybrid cantilever structure system for widening roads, characterized in that: it includes a cantilever beam, and the cantilever beam includes a first section of concrete precast block, a third section of concrete precast block, a second section of concrete precast block located between the first section of concrete precast block and the third section of concrete precast block, and a plurality of steel member joint devices;

[0008] Steel member joint devices are provided at both ends of the second-section concrete precast block; the first-section concrete precast block is connected to the steel member joint device at one end of the second-section concrete precast block through the steel member joint device, and the third-section concrete precast block is connected to the steel member joint device at the other end of the second-section concrete precast block through the steel member joint device;

[0009] The steel member joint device includes a top plate and a bottom plate; the top plate and the bottom plate are horizontally connected by a web, and the top plate and the bottom plate are vertically connected by a bearing plate; the web is divided into an outer web and an inner web by the bearing plate; between multiple steel member joint devices are connected by the top plate, the bottom plate and the outer web, and the inner web is located within the first-section concrete precast block, the second-section concrete precast block and the third-section concrete precast block.

[0010] In the above technical solution, there are a sidewalk slab and a carriageway slab on the cantilever beam; the sidewalk slab is located on the side of the first-section concrete precast block away from the second-section concrete precast block; the carriageway slab is located on the second-section concrete precast block, the third-section concrete precast block, and the side of the first-section concrete precast block close to the second-section concrete precast block.

[0011] In the above technical solution, the sidewalk slab is located between the steel anti-collision guardrail and the sidewalk railing; the steel anti-collision guardrail is located between the sidewalk slab and the carriageway slab; the sidewalk railing is located at one end of the first-section concrete precast block away from the second-section concrete precast block.

[0012] In the above technical solution, a plurality of bolt holes are opened on the outer web, and the outer webs are connected by bolts; the top plate and the bottom plate are connected by welding.

[0013] In the above technical solution, shear studs are provided on both sides of the inner web, on the side of the top plate close to the bottom plate, on the side of the bottom plate close to the top plate, and on the side of the bearing plate close to the inner web.

[0014] In the above technical solution, rib plates are provided on the side of the top plate close to the bottom plate and on the side of the bottom plate close to the top plate.

[0015] In the above technical solution, there are pads on both sides at the bottom of the cantilever beam.

[0016] In the above technical solution, the sidewalk slab includes a plurality of precast sidewalk slab components and a cast-in-place joint located between the plurality of precast sidewalk slab components.

[0017] In order to achieve the above second object, the technical solution of the present invention is: a construction method for a prefabricated steel-concrete hybrid cantilever structure system for road widening, which is characterized by including the following steps:

[0018] Step 1: Fabricate the steel component joint device, precast the first section of concrete precast block, the second section of concrete precast block, and the third section of concrete precast block, and precast multiple sidewalk slab precast components;

[0019] Step 2: Conduct the excavation for the leveling of the existing road site and pour the cushion blocks on-site;

[0020] Step 3: After hoisting the first section of concrete precast block, the second section of concrete precast block, and the third section of concrete precast block into place, carry out the bolt connection and welding construction at the steel component joint device on-site;

[0021] Step 4: Backfill, level the subgrade between the first section of concrete precast block, the second section of concrete precast block, and the third section of concrete precast block, and pour the carriageway slab on-site;

[0022] Step 5: Hoist the sidewalk slab precast components into place for installation, and pour the cast-in-place joints between multiple sidewalk slab precast components to form an integral whole for multiple sidewalk slab precast components;

[0023] Step 6: Construct the steel anti-collision guardrail, sidewalk railing, and other auxiliary facilities to complete the construction.

[0024] Compared with the prior art, the present invention has the following advantages:

[0025] 1) The present invention uses a prefabricated and assembled cantilever beam as the main load-bearing component to bear the loads transmitted from the green belt, sidewalk, carriageway, etc.; to prevent possible uneven settlement on the carriageway side, a reinforced concrete carriageway slab is provided on the top of the cross beam on the carriageway side.

[0026] 2) As the most important component of the system of the present invention, the cantilever beam is finely designed; considering the problems that the weight of a whole precast cross beam is too large and inconvenient for transportation, and the curing time of in-situ casting is too long and not convenient for standardized production, etc., the present invention cuts and prefabricates the cantilever beam in blocks, and the weight of each block after segmentation can be controlled as needed, solving the problems of difficult selection of storage sites, transportation equipment, and hoisting equipment caused by excessive weight and size.

[0027] 3) To ensure the standardization and reliability of on-site installation, the first section of concrete precast block, the second section of concrete precast block, and the third section of concrete precast block are connected by a steel component joint device. Part of the steel component joint device is buried in the concrete during the precasting of the concrete precast block, and the other part is exposed on the outside for convenient welding and bolt connection.

[0028] 4) The main load-bearing components of the present invention adopt the prefabricated and assembled method, and the weights of each precast component can be controlled within a reasonable range, having the advantages of simple transportation and installation, reliable force-bearing, convenient for standardized production in the factory, and convenient for large-area standardized construction in sections.

[0029] 5) The present invention can not only be used in road widening projects, but can also be used to replace the outer support structure when the site is limited and the outer support structure cannot be adopted. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic structural view of the present invention.

[0031] Figure 2 It is a schematic structural view of the cantilever beam.

[0032] Figure 3 It is a schematic structural view of the first concrete precast block.

[0033] Figure 4 It is a schematic structural view of the second concrete precast block.

[0034] Figure 5 It is a schematic structural view of the third concrete precast block.

[0035] Figure 6 It is a schematic structural view of the steel member joint device.

[0036] Wherein, 1 - cantilever beam, 11 - the first concrete precast block, 12 - the second concrete precast block, 13 - the third concrete precast block, 2 - steel member joint device, 21 - top plate, 22 - bottom plate, 231 - outer web, 232 - inner web, 24 - bearing plate, 25 - shear stud, 26 - rib plate, 27 - bolt hole, 3 - sidewalk slab, 31 - sidewalk slab precast member, 32 - cast-in-place joint, 4 - carriageway slab, 51 - steel anti-collision guardrail, 52 - sidewalk railing, 6 - cushion block, 7 - inner sidewalk. DETAILED DESCRIPTION OF THE INVENTION

[0037] The following will describe in detail the implementation of the present invention with reference to the drawings. However, they do not constitute a limitation to the present invention and are only for illustration purposes. At the same time, the advantages of the present invention will become clearer and easier to understand through the description.

[0038] Referring to the drawings, it can be seen that the prefabricated steel-concrete hybrid cantilever structure system for widening roads includes a cantilever beam 1. The cantilever beam 1 includes a first concrete precast block 11, a third concrete precast block 13, a second concrete precast block 12 located between the first concrete precast block 11 and the third concrete precast block 13, and a plurality of steel member joint devices 2;

[0039] Steel member joint devices 2 are provided at both ends of the second concrete precast block 12; the first concrete precast block 11 is connected to the steel member joint device 2 at one end of the second concrete precast block 12 through the steel member joint device 2, and the third concrete precast block 13 is connected to the steel member joint device 2 at the other end of the second concrete precast block 12 through the steel member joint device 2;

[0040] The steel member joint device 2 includes a top plate 21 and a bottom plate 22; the top plate 21 and the bottom plate 22 are horizontally connected by a web, and the top plate 21 and the bottom plate 22 are vertically connected by a bearing plate 24; the web is divided into an outer web 231 and an inner web 232 by the bearing plate 24; multiple steel member joint devices 2 are connected by the outer web 231, and the inner web 232 is located inside the first concrete precast block 11, the second concrete precast block 12, and the third concrete precast block 13.

[0041] The cantilever beam 1 is provided with a sidewalk slab 3 and a carriageway slab 4; the sidewalk slab 3 is located on the side of the first concrete precast block 11 away from the second concrete precast block 12; the carriageway slab 4 is located on the second concrete precast block 12, the third concrete precast block 13, and on the side of the first concrete precast block 11 close to the second concrete precast block 12.

[0042] The sidewalk slab 3 is located between the steel anti-collision guardrail 51 and the sidewalk railing 52; the steel anti-collision guardrail 51 is located between the sidewalk slab 3 and the carriageway slab 4; the sidewalk railing 52 is located at one end of the first concrete precast block 11 away from the second concrete precast block 12.

[0043] A plurality of bolt holes 27 are formed in the outer web 231, and the outer webs 231 are connected by bolts; the top plate 21 and the bottom plate 22 are connected by welding.

[0044] Shear studs 25 are provided on both sides of the inner web 232, on the side of the top plate 21 close to the bottom plate 22, on the side of the bottom plate 22 close to the top plate 21, and on the side of the bearing plate 24 close to the inner web 232.

[0045] Rib plates 26 are provided on the side of the top plate 21 close to the bottom plate 22 and on the side of the bottom plate 22 close to the top plate 21; the middle of the outer web 231 and the middle of the side of the bearing plate 24 close to the outer web 231 are connected by rib plates 26.

[0046] There are cushion blocks 6 on both sides at the bottom of the cantilever beam 1.

[0047] The sidewalk slab 3 includes a plurality of sidewalk slab precast members 31 and a cast-in-place joint 32 located between the plurality of sidewalk slab precast members 31.

[0048] Construction method of prefabricated steel-concrete hybrid cantilever structure system for road widening, characterized by including the following steps:

[0049] Step 1: Fabricate the steel component joint device 2, precast the first section of concrete precast block 11, the second section of concrete precast block 12, and the third section of concrete precast block 13, and precast multiple sidewalk precast components 31;

[0050] Step 2: Conduct site leveling excavation of the existing road and pour pads on-site;

[0051] Step 3: After hoisting the first section of concrete precast block 11, the second section of concrete precast block 12, and the third section of concrete precast block 13 into place, carry out bolt connection and welding construction at the steel component joint device 2 on-site;

[0052] Step 4: Backfill and level the subgrade between the first section of concrete precast block 11, the second section of concrete precast block 12, and the third section of concrete precast block 13, and pour the carriageway slab 4 on-site;

[0053] Step 5: Hoist the sidewalk precast components 31 into place for installation, and pour the cast-in-place joints 32 between multiple sidewalk precast components 31 to make multiple sidewalk precast components 31 form an integral whole;

[0054] Step 6: Construct the steel anti-collision guardrail 51, the sidewalk railing 52, and other ancillary facilities to complete the construction.

[0055] In actual use, the cantilever beam 1 serves as the main load-bearing member, providing support for the sidewalk slab 3 and the carriageway slab 4, and transferring the upper structure load to the pad 6; the cantilever beam 1 adopts a steel-concrete hybrid structural form, with the concrete structure being the first section of concrete precast block 11, the second section of concrete precast block 12, and the third section of concrete precast block 13, and the steel structure being the steel component joint device 2; the first section of concrete precast block 11, the second section of concrete precast block 12, and the third section of concrete precast block 13 are designed according to the required cantilever length and the need to maintain structural stability; there is an inner sidewalk 7 between the third section of concrete precast block 13 and the building.

[0056] The pad 6 serves as a basic component, mainly providing good support for the cantilever beam 1, improving the force transmission of the beam, and preventing uneven settlement problems caused by the beam being simply placed on the embankment.

[0057] The steel component joint device 2 mainly plays a connecting role. A part of the steel component joint device 2 is buried in the concrete during the precasting of the concrete precast member, and the other part is exposed. After all the components are transported to the site for assembly, on-site welding and bolt connection are carried out; the shear studs 25 ensure the reliability of the connection between the steel structure and the concrete structure; the bolt holes 27 provide conditions for bolt connection.

[0058] The sidewalk slabs adopt precast sidewalk slab components 31, which are installed on the first-section concrete precast blocks 11, and multiple precast sidewalk slab components 31 are longitudinally connected into a whole by cast-in-place joints 32.

[0059] There is a certain interval between the two cantilever beams 2. The stiffness of the roadbed is relatively large at the positions of the beams, while the stiffness of the roadbed between the beams is relatively small. To prevent uneven settlement of the road surface, the top of the side beam on the driving lane adopts the driving lane slab 4, which is a cast-in-place reinforced concrete slab, and the driving lane slab 4 is also laid between the two beams.

[0060] Other parts not described belong to the prior art.

Claims

1. A prefabricated steel-concrete hybrid cantilever structural system for road widening, characterized in that: It includes a cantilever cross beam (1), and the cantilever cross beam (1) includes a first section of precast concrete block (11), a third section of precast concrete block (13), a second section of precast concrete block (12) located between the first section of precast concrete block (11) and the third section of precast concrete block (13), and a plurality of steel member joint devices (2); Steel member joint devices (2) are provided at both ends of the second section of precast concrete block (12); the first section of precast concrete block (11) is connected to the steel member joint device (2) at one end of the second section of precast concrete block (12) through the steel member joint device (2), and the third section of precast concrete block (13) is connected to the steel member joint device (2) at the other end of the second section of precast concrete block (12) through the steel member joint device (2); The steel member joint device (2) includes a top plate (21) and a bottom plate (22); the top plate (21) and the bottom plate (22) are horizontally connected by a web, and the top plate (21) and the bottom plate (22) are vertically connected by a bearing plate (24); the web is divided into an outer web (231) and an inner web (232) by the bearing plate (24); a plurality of the steel member joint devices (2) are connected through the outer web (231), and the inner web (232) is located inside the first section of precast concrete block (11), the second section of precast concrete block (12), and the third section of precast concrete block (13); The first section of precast concrete block, the second section of precast concrete block, and the third section of precast concrete block are connected by steel member joint devices. Part of the steel member joint devices are buried in the concrete during the precasting of the precast concrete blocks, and the other part is exposed on the outside for welding and bolt connection; A plurality of bolt holes (27) are formed in the outer web (231), and the outer webs (231) are connected by bolts; Shear studs (25) are provided on both sides of the inner web (232), on the side of the top plate (21) close to the bottom plate (22), on the side of the bottom plate (22) close to the top plate (21), and on the side of the bearing plate (24) close to the inner web (232); Reinforcing plates (26) are provided on the side of the top plate (21) close to the bottom plate (22) and on the side of the bottom plate (22) close to the top plate (21); 2. The prefabricated steel-concrete hybrid cantilever structural system for road widening according to claim 1, characterized in that: A sidewalk slab (3) and a roadway slab (4) are provided on the cantilever cross beam (1); the sidewalk slab (3) is located on the side of the first section of precast concrete block (11) away from the second section of precast concrete block (12); the roadway slab (4) is located on the second section of precast concrete block (12), on the third section of precast concrete block (13), and on the side of the first section of precast concrete block (11) close to the second section of precast concrete block (12); 3. The prefabricated steel-concrete hybrid cantilever structural system for widening roads according to claim 2, wherein: The sidewalk slab (3) is located between the steel anti-collision guardrail (51) and the sidewalk railing (52); the steel anti-collision guardrail (51) is located between the sidewalk slab (3) and the roadway slab (4); the sidewalk railing (52) is located at one end of the first section of precast concrete block (11) away from the second section of precast concrete block (12); 4. The prefabricated steel-concrete hybrid cantilever structural system for widening roads according to claim 3, characterized in that: Pads (14) are provided on both sides of the bottom of the cantilever cross beam (1).

5. The prefabricated steel-concrete hybrid cantilever structural system for widening roads according to claim 4, characterized in that: The sidewalk slab (3) includes a plurality of precast members (31) and a cast-in-place joint (32) located between the plurality of precast members (31).

6. The construction method of the prefabricated steel-concrete hybrid cantilever structural system for widening roads according to any one of claims 1-5, characterized in that, It includes the following steps: Step 1: Fabricate the steel member joint device (2), precast the first-section concrete precast block (11), the second-section concrete precast block (12), and the third-section concrete precast block (13), and precast a plurality of precast members (31); Step 2: Conduct the excavation of the existing road site leveling and cast the sleeper beam on-site; Step 3: After hoisting the first-section concrete precast block (11), the second-section concrete precast block (12), and the third-section concrete precast block (13) into place, conduct the bolt connection and welding construction at the steel member joint device (2) on-site; Step 4: Backfill and level the subgrade between the first-section concrete precast block (11), the second-section concrete precast block (12), and the third-section concrete precast block (13), and cast the precast members (31) on-site; Step 5: Hoist the precast members (31) into place and cast the cast-in-place joint (32) between the plurality of precast members (31) so that the plurality of precast members (31) form an integral whole; Step 6: Pave the steel anti-collision guardrail (51), the sidewalk railing (52), and the asphalt to complete the construction.

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