Bridge seamless structure and bridge

Abstract

The invention discloses a bridge seamless structure and a bridge, the bridge seamless structure comprises a sliding isolation layer, a target concrete layer and a surface concrete layer, the sliding isolation layer is laid on the top side of a bridge abutment back wall, the target concrete layer is laid on the top side of the sliding isolation layer and the top side of a main beam, and the surface concrete layer is laid on the top side of the target concrete layer. The target concrete layer is made of reactive powder concrete, and the surface concrete layer is laid on the top side of the target concrete layer. According to the seamless bridge structure, the sliding isolation layer is laid on the back wall of the bridge abutment, the target concrete layer and the surface concrete layer are sequentially laid on the sliding isolation layer and the main beam, the original expansion joint design in the cross section direction between the beam end and the back wall is replaced, and therefore the integrity and durability of a bridge floor are improved; and the phenomenon of vehicle bumping at the expansion joint is eliminated through the seamless design, the smoothness and comfort of driving are improved, and meanwhile the maintenance cost and time consumption are reduced.

Description

Technical Field

[0001] This invention relates to the field of bridge structure design technology, and in particular to a seamless bridge structure and a bridge. Background Technology

[0002] Currently, in conventional concrete bridge design, in order to adapt to the deformation of the bridge structure caused by temperature changes, concrete shrinkage and creep, and vehicle loads, cross-sectional expansion joints are usually set at both ends of small box girders or hollow slab girders to absorb longitudinal deformation caused by temperature, shrinkage and creep, and vehicle loads.

[0003] However, steel or rubber seals in bridge expansion joints are prone to fatigue, aging, and damage, requiring regular replacement and maintenance, resulting in high maintenance costs throughout the entire life cycle. Furthermore, expansion joints can cause vehicle bouncing, affecting ride smoothness and comfort, and create abrupt stiffness changes at the bridge abutments, further accelerating bridge structural damage.

[0004] Therefore, improving the smoothness and comfort of driving on bridges, and reducing the cost and time of bridge maintenance, has become an urgent problem to be solved. Summary of the Invention

[0005] This invention discloses a seamless bridge structure and bridge, which can replace the original cross-sectional expansion joint design, thereby improving the integrity and stability of the bridge surface section. The seamless design eliminates the vehicle bouncing phenomenon at the expansion joint, improving the smoothness and comfort of driving, while reducing maintenance costs and time.

[0006] To achieve the above objectives, this invention discloses a seamless bridge structure applied to a bridge, the bridge comprising an abutment back wall and a main beam; the seamless bridge structure includes: A sliding isolation layer is laid on the top side of the bridge abutment back wall; The target concrete layer is laid on the top side of the sliding isolation layer and on the top side of the main beam near the abutment back wall. The target concrete layer is made of reactive powder concrete. A surface concrete layer is laid on the top side of the target concrete layer.

[0007] As an optional implementation, in an embodiment of the first aspect of the present invention, the sliding isolation layer includes: A steel plate layer, which is laid on the top side of the bridge abutment back wall, is made of stainless steel. The target tar paper layer is disposed between the target concrete layer and the steel plate layer.

[0008] As an optional implementation, in an embodiment of the first aspect of the present invention, the target tarpaulin layer comprises two tarpaulin layers, which are sequentially laid on the top side of the steel plate layer.

[0009] As an optional implementation, in an embodiment of the first aspect of the present invention, a beam-wall gap with a preset distance is provided between the bridge abutment back wall and the main beam, the beam-wall gap is filled with joint sizing foam, and the top of the joint sizing foam is flush with the top surface of the bridge abutment back wall.

[0010] As an optional implementation, in an embodiment of the first aspect of the present invention, the seamless bridge structure further includes: Multiple main beam anchoring nails are provided, each of which is sequentially inserted into the main beam, the target concrete layer, and the surface concrete layer, and the main beam anchoring nails are arranged in a quincunx pattern on the top surface of the main beam.

[0011] As an optional implementation, in an embodiment of the first aspect of the present invention, the bridge further includes an abutment approach slab, the abutment approach slab being disposed at the end of the abutment back wall away from the main beam; the seamless bridge structure further includes: A slab concrete layer is laid on the top side of the bridge approach slab, and the top surface of the slab concrete layer is flush with the top surface of the surface concrete layer. The construction joints are provided between the slab concrete layer and the target concrete layer and the surface concrete layer at preset intervals. The construction joints are filled with composite polyurethane material, and the top of the composite polyurethane material is flush with the top surface of the slab concrete layer and the top surface of the surface concrete layer, respectively.

[0012] As an optional implementation, in an embodiment of the first aspect of the present invention, an inorganic waterproofing agent is used to isolate the main beam from the target concrete layer, and an inorganic waterproofing agent is used to isolate the bridge approach slab from the approach slab concrete layer.

[0013] As an optional implementation, in an embodiment of the first aspect of the present invention, the thickness of the target concrete layer ranges from 6 cm to 10 cm, and the thickness of the surface concrete layer ranges from 8 cm to 14 cm.

[0014] As an optional implementation, in an embodiment of the first aspect of the present invention, the compressive strength of the target concrete layer is not less than 120 MPa, the flexural tensile strength of the target concrete layer is not less than 14 MPa, and the compressive strength of the surface concrete layer is not less than 50 MPa.

[0015] Secondly, the present invention discloses a bridge, comprising: Bridge abutment back wall; Main beam; As described in the first aspect embodiment above, in the seamless bridge structure, the target concrete layer is laid on the top side of the sliding isolation layer and the top side of the main beam near the abutment back wall, and the surface concrete layer is laid on the top side of the target concrete layer.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: The seamless bridge structure provided by this invention replaces the original transverse expansion joint design by laying a sliding isolation layer on the abutment back wall, followed by a target concrete layer and a surface concrete layer sequentially laid on the sliding isolation layer and the main beam. This improves the overall integrity and durability of the bridge deck, and the seamless design eliminates the bouncing phenomenon at expansion joints, improving driving smoothness and comfort, while also reducing maintenance costs and time. Furthermore, the target concrete layer uses ultra-high performance reactive powder concrete, which has excellent flexural tensile properties, thus overcoming the bending moment caused by the gap between the beam ends and the back wall of the original bridge, enhancing the durability and crack resistance of the pavement layer, and extending the service life of the bridge.

[0017] The bridge provided by this invention adopts the aforementioned seamless bridge structure. By laying a sliding isolation layer on the abutment back wall, and then sequentially laying a target concrete layer and a surface concrete layer on the sliding isolation layer and the main beam, it replaces the original cross-sectional expansion joint design. This improves the overall integrity and durability of the bridge deck. Furthermore, the seamless design eliminates the bouncing phenomenon at expansion joints, improving driving smoothness and comfort, and reducing maintenance costs and time. Simultaneously, the target concrete layer uses ultra-high performance reactive powder concrete, which has excellent flexural tensile properties, thus overcoming the bending moment generated by the gap between the beam ends and the back wall of the original bridge, enhancing the durability and crack resistance of the pavement layer, and extending the service life of the bridge. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a specific embodiment of the seamless bridge structure in this invention; Figure 2 This is a cross-sectional view of a specific embodiment of the bridge in this invention; Figure 3 for Figure 2 Enlarged view of region A in the cross-sectional structure shown; Figure 4 for Figure 2 An enlarged view of region B in the cross-sectional structure shown.

[0019] The meanings of the reference numerals in the attached figures are as follows: Bridge abutment back wall 01, main beam 02, main beam anchor nail 021, bridge abutment body 03, bridge approach slab 04, sliding isolation layer 100, target concrete layer 200, surface concrete layer 300, approach slab concrete layer 400, joint slurry foam 500, foam board 501, polyurethane foam adhesive 502, composite polyurethane material 600. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing the invention and its embodiments, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to be constructed and operated in a specific orientation.

[0022] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in certain situations to indicate a dependency or connection. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0023] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0024] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0025] The technical solution of the present invention will be further described below with reference to the embodiments and accompanying drawings.

[0026] Currently, in conventional concrete bridge design, in order to adapt to the deformation of the bridge structure caused by temperature changes, concrete shrinkage and creep, and vehicle loads, cross-sectional expansion joints are usually set at both ends of small box girders or hollow slab girders to absorb longitudinal deformation caused by temperature, shrinkage and creep, and vehicle loads.

[0027] However, steel or rubber seals in bridge expansion joints are prone to fatigue, aging, and damage, requiring regular replacement and maintenance, resulting in high maintenance costs throughout the entire life cycle. Furthermore, expansion joints can cause vehicle bouncing, affecting ride smoothness and comfort, and create abrupt stiffness changes at the bridge abutments, further accelerating bridge structural damage.

[0028] Therefore, improving the smoothness and comfort of driving on bridges, and reducing the cost and time of bridge maintenance, has become an urgent problem to be solved.

[0029] In response, embodiments of the present invention provide a seamless bridge structure and bridge, which can improve the integrity and stability of the bridge surface section, improve the smoothness and comfort of driving, and at the same time reduce maintenance costs and time consumption.

[0030] like Figure 1 As shown, this invention discloses a seamless bridge structure applied to a bridge, which includes an abutment back wall 01 and a main beam 02. The seamless bridge structure includes: a sliding isolation layer 100, a target concrete layer 200, and a surface concrete layer 300. The sliding isolation layer 100 is laid on the top side of the abutment back wall 01; the target concrete layer 200 is laid on the top side of the sliding isolation layer 100 and on the top side of the main beam 02 near the end of the abutment back wall 01, and the target concrete layer 200 is made of reactive powder concrete; the surface concrete layer 300 is laid on the top side of the target concrete layer 200.

[0031] In this embodiment, refer to Figure 2 The bridge includes an approach slab 04, an abutment body 03, an abutment back wall 01, and a main beam 02. The upper end of the abutment body 03 is the abutment back wall 01, which supports the end of the main beam 02 near the abutment back wall 01. The abutment back wall 01 is located between the main beam 02 and the approach slab 04. For example, in a specific embodiment, the bridge is designed to meet Highway-II load requirements, with a bridge deck width of 10 meters and a length of 54.04 meters. The upper main beam 02 can be a three-span 16-meter box girder, and the lower structure consists of column piers.

[0032] Reference Figure 1 A sliding isolation layer 100 is first laid on the upper side of the bridge abutment back wall 01. The sliding isolation layer 100 can reduce the impact of the stress from above on the bridge abutment back wall 01 below, and play a role in isolation and protection.

[0033] A target concrete layer 200 is laid on the upper side of the sliding isolation layer 100 and the upper side of the main beam 02. The target concrete layer 200 is made of ultra-high performance concrete (UHPC) reactive powder concrete. The steel fiber content of the target concrete layer 200 is no less than 2.5%, and the water-cement ratio ranges from 0.18 to 0.2. The target concrete layer 200 can be naturally cured using a membrane and geotextile, with a water curing time of no less than 72 hours. Ultra-high performance concrete enhances the durability and crack resistance of this pavement layer, thereby extending the service life of the bridge.

[0034] A surface concrete layer 300 is laid on the upper side of the target concrete layer 200. The surface concrete layer 300 can be made of conventional types of concrete such as C50. The specific type can be selected according to actual needs.

[0035] As can be seen, the seamless bridge structure of the present invention forms an integral seamless bridge surface structure by laying a sliding isolation layer 100 on the abutment back wall 01, and then sequentially laying a target concrete layer 200 and a surface concrete layer 300 on the sliding isolation layer 100 and the main beam 02. This replaces the original cross-sectional expansion joint design, thereby improving the integrity and durability of the bridge deck. The integral seamless bridge surface structure design can also eliminate the bumping phenomenon of the original expansion joint, improve the smoothness and comfort of driving, and reduce maintenance costs and time. At the same time, the target concrete layer 200 uses ultra-high performance active powder concrete, which has excellent flexural tensile properties, thereby overcoming the bending moment generated by the gap between the beam end and the back wall of the original bridge, enhancing the durability and crack resistance of the pavement layer, and extending the service life of the bridge.

[0036] In one specific embodiment, the thickness of the target concrete layer 200 ranges from 6 cm to 10 cm, and the thickness of the surface concrete layer 300 ranges from 8 cm to 14 cm. To ensure that the target concrete layer 200 has suitable durability and crack resistance, the laying thickness of the target concrete layer 200 is set to 6 cm to 10 cm, and to ensure that the surface concrete layer 300 has sufficient load-bearing capacity, the laying thickness of the target concrete layer 200 is set to 8 cm to 14 cm. In yet another embodiment, the compressive strength of the target concrete layer 200 is not less than 120 MPa, the flexural tensile strength of the target concrete layer 200 is not less than 14 MPa, and the compressive strength of the surface concrete layer 300 is not less than 50 MPa.

[0037] like Figure 3As shown, in an optional embodiment, the sliding isolation layer 100 includes a steel plate layer and a target tarpaulin layer. The steel plate layer is laid on the top side of the abutment back wall 01 and is made of stainless steel; the target tarpaulin layer is disposed between the target concrete layer 200 and the steel plate layer.

[0038] In this optional embodiment, the sliding isolation layer 100 on the upper side of the abutment backwall 01 is specifically divided into a steel plate layer and a target asphalt felt layer. The upper side of the abutment backwall 01 is first laid with a steel plate layer, which is made of stainless steel and can be fixed to the abutment backwall 01 using anchoring nails. The stainless steel thickness of the steel plate layer can be selected as 1 mm. The target asphalt felt layer is laid on top of the steel plate layer, which serves to adapt to bridge structural deformation and isolate loads.

[0039] In one specific embodiment, the target asphalt felt layer comprises two asphalt felt layers, which are laid sequentially on the top side of the steel plate layer. By setting two layers of asphalt felt, the bridge's ability to adapt to deformation and isolate loads can be further ensured.

[0040] like Figure 3 As shown, in an optional embodiment, a beam-wall gap with a preset distance is provided between the bridge abutment back wall 01 and the main beam 02, and the beam-wall gap is filled with joint sizing foam 500, the top of the joint sizing foam 500 being flush with the top surface of the bridge abutment back wall 01.

[0041] In this optional embodiment, refer to Figure 3 The abutment back wall 01 and the main beam 02 are spaced at a preset distance, C1, which can be set to 4cm. The gap in the beam-wall gap C1 is filled with sealant foam 500, and the upper end of the sealant foam 500 is flush with the top surface of the abutment back wall 01. This ensures that no pits appear between the top surfaces of the abutment back wall 01 and the main beam 02, thus ensuring that the concrete of the target concrete layer 200 does not sink into the beam-wall gap C1 when it is laid. The sealant foam 500 can be composed of foam board and polyurethane foam adhesive, for example... Figure 3 The foam board has a vertical length of 20cm, and the bottom end of the foam board is fitted with 5cm of polyurethane foam to limit and fix the foam board.

[0042] like Figure 2 As shown, in an optional embodiment, the seamless bridge structure further includes a plurality of main beam anchor bolts 021. Each main beam anchor bolt 021 is sequentially inserted into the main beam 02, the target concrete layer 200, and the surface concrete layer 300, and the main beam anchor bolts 021 are arranged in a quincunx pattern on the top surface of the main beam 02.

[0043] In this optional embodiment, before laying the target concrete layer 200 and the surface concrete layer 300, multiple main beam anchor nails 021 are pre-embedded on the upper surface of the main beam 02 near the abutment back wall 01, i.e., the bottom part of each main beam anchor nail 021 is embedded in the main beam 02. The multiple main beam anchor nails 021 are arranged in a quincunx pattern in plan view, with the spacing between two adjacent main beam anchor nails 021 being 30cm in the longitudinal direction of the bridge and 10cm in the transverse direction of the bridge, and the embedment depth in the main beam 02 being 14cm. After laying the target concrete layer 200 and the surface concrete layer 300, the middle part of each main beam anchor nail 021 passes through the target concrete layer 200, and the upper part is embedded in the surface concrete layer 300, thereby achieving the function of fixing the main beam 02, the target concrete layer 200, and the surface concrete layer 300. The main beam anchor nail 021 can be made of HRB400 steel bars.

[0044] As can be seen, this optional embodiment can also achieve the fixing effect between the main beam 02, the target concrete layer 200 and the surface concrete layer 300 by using multiple main beam anchoring nails 021 at one end of the main beam 02 near the abutment back wall 01, thereby further improving the stability of the beam end structure of the main beam 02.

[0045] like Figure 2 and Figure 4 As shown, in an optional embodiment, the bridge further includes an approach slab 04, which is disposed at the end of the abutment back wall 01 away from the main beam 02. The seamless bridge structure also includes an approach slab concrete layer 400. The approach slab concrete layer 400 is laid on the top side of the approach slab 04, and the top surface of the approach slab concrete layer 400 is flush with the top surface of the surface concrete layer 300. Construction joints with preset intervals are provided between the approach slab concrete layer 400 and the target concrete layer 200 and the surface concrete layer 300, respectively. The construction joints are filled with composite polyurethane material 600, and the top of the composite polyurethane material 600 is flush with the top surface of the approach slab concrete layer 400 and the top surface of the surface concrete layer 300, respectively.

[0046] In this optional embodiment, refer to Figure 2 and Figure 4 A concrete layer 400 is laid on the upper side of the bridge approach slab 04. There is a gap between the bridge approach slab 04 and the bridge abutment back wall 01. In the above embodiment, the sliding isolation layer 100 laid on the bridge abutment back wall 01 can also be continuously laid in the gap. The right end of the concrete layer 400 can also cover the top of the gap.

[0047] The slab concrete layer 400 can be made of conventional type concrete such as C50. The thickness of the slab concrete layer 400 is equal to the sum of the thicknesses of the target concrete layer 200 and the surface concrete layer 300. Referring to the thicknesses of the target concrete layer 200 and the surface concrete layer 300 listed in the above embodiment, the thickness of the slab concrete layer 400 is set to 15cm. The slab concrete layer 400 and the surface concrete layer 300 are spaced apart by a preset distance, and the width of the construction joint C2 can be set to 2cm to 2.5cm. The construction joint C2 is filled with a highly elastic composite polyurethane material 600, and the upper end of the composite polyurethane material 600 is flush with the top surface of the slab concrete layer 400 and the surface concrete layer 300.

[0048] In an optional embodiment, an inorganic waterproofing agent is used to isolate the main beam 02 from the target concrete layer 200, and an inorganic waterproofing agent is used to isolate the abutment slab 04 from the abutment slab concrete layer 400. In this optional embodiment, before laying the target concrete layer 200 and the abutment slab concrete layer 400, a water-based penetrating inorganic waterproofing agent is first applied to the upper surface of the main beam 02 and the upper surface of the abutment slab 04 to prevent water from seeping into the main beam 02 and the abutment slab 04.

[0049] The present invention also discloses a bridge, comprising: an abutment back wall 01, a main beam 02, and the seamless bridge structure described in the above embodiments of the present invention, wherein a target concrete layer 200 is laid on the top side of the sliding isolation layer 100 and the top side of the main beam 02 near the abutment back wall 01, and a surface concrete layer 300 is laid on the top side of the target concrete layer 200.

[0050] As can be seen, in this embodiment, the bridge adopts the aforementioned seamless bridge structure. By laying a sliding isolation layer 100 on the abutment back wall 01, and then sequentially laying a target concrete layer 200 and a surface concrete layer 300 on the sliding isolation layer 100 and the main beam 02, the original cross-sectional expansion joint design is replaced. This improves the integrity and stability of the bridge surface section, and the seamless design eliminates the bouncing phenomenon at the expansion joints, improving the smoothness and comfort of driving, and reducing maintenance costs and time. Simultaneously, the target concrete layer 200 uses ultra-high performance reactive powder concrete, enhancing the durability and crack resistance of the pavement layer and extending the service life of the bridge.

[0051] The technical means disclosed in this invention are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this invention, and these improvements and modifications are also considered within the scope of protection of this invention.

Claims

1. A bridge seamless structure, characterized by, The bridge comprises an abutment back wall and a main beam; the seamless structure of the bridge comprises: a sliding isolation layer laid on the top side of the abutment back wall; a target concrete layer laid on the top side of the sliding isolation layer and the top side of one end of the main beam close to the abutment back wall, the target concrete layer being made of reactive powder concrete; a surface concrete layer laid on the top side of the target concrete layer.

2. The bridge seamless structure according to claim 1, characterized by, The sliding isolation layer comprises: a steel plate layer laid on the top side of the abutment back wall, the steel plate layer being made of stainless steel material; a target oil felt layer arranged between the target concrete layer and the steel plate layer.

3. The bridge seamless structure according to claim 2, characterized by, The target oil felt layer comprises two oil felt layers laid on the top side of the steel plate layer in sequence.

4. The bridge seamless structure according to claim 1, characterized by, A beam wall interval with a preset distance is arranged between the abutment back wall and the main beam, and the beam wall interval is filled with joint filling foam, the top end of the joint filling foam being flush with the top surface of the abutment back wall.

5. The bridge seamless structure according to claim 1, characterized by The seamless structure of the bridge further comprises: a plurality of main beam anchoring nails, each of which is sequentially arranged in the main beam, the target concrete layer and the surface concrete layer, and each of the main beam anchoring nails is arranged in a plum blossom shape on the top surface plane of the main beam.

6. The bridge seamless structure according to claim 1, wherein The bridge further comprises a bridge head apron arranged at one end of the abutment back wall away from the main beam; the seamless structure of the bridge further comprises: a apron concrete layer laid on the top side of the bridge head apron, the top surface of the apron concrete layer being flush with the top surface of the surface concrete layer; wherein a construction joint with a preset interval is arranged between the apron concrete layer and the target concrete layer and the surface concrete layer respectively, the construction joint being filled with a composite polyurethane material, the top end of the composite polyurethane material being flush with the top surface of the apron concrete layer and the top surface of the surface concrete layer respectively.

7. The seamless structure of the bridge according to claim 6, an inorganic waterproof agent is arranged between the main beam and the target concrete layer, and an inorganic waterproof agent is arranged between the bridge head apron and the apron concrete layer.

8. The bridge seamless structure according to any one of claims 1 to 7, characterized by, The thickness of the target concrete layer ranges from 6 cm to 10 cm, and the thickness of the surface concrete layer ranges from 8 cm to 14 cm.

9. The bridge seamless structure according to any one of claims 1 to 7, characterized in that, The compressive strength of the target concrete layer is not less than 120 MPa, and the flexural tensile strength of the target concrete layer is not less than 14 MPa; the compressive strength of the surface concrete layer is not less than 50 MPa.

10. A bridge, characterized by The bridge comprises: an abutment back wall; a main beam; the seamless structure of the bridge according to any one of claims 1 to 9, the target concrete layer being laid on the top side of the sliding isolation layer and the top side of one end of the main beam close to the abutment back wall, and the surface concrete layer being laid on the top side of the target concrete layer.

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