A precast concrete bridge deck continuous connection plate structure and its construction method

Abstract

The present invention discloses a precast concrete bridge deck continuous connecting plate structure and a construction method thereof, comprising a support system, a simply supported beam system, an ultra-high performance concrete connecting plate, and a bridge deck layer system disposed on the simply supported beam system; the connecting plate is in a stepped shape, with two rows of through holes reserved in the anchoring area of the connecting plate, which is connected to the simply supported beam system via pre-embedded bolts. The excellent deformation capacity and high compressive strength of ultra-high performance concrete can effectively prevent the connecting plate from cracking, and the ultra-high performance concrete connecting plate prefabricated by pressurization and steam curing can better exert the mechanical property advantages of the ultra-high performance concrete material and eliminate the adverse effects of shrinkage. The connecting plate in the present invention utilizes the superior mechanical properties of ultra-high performance concrete to meet the needs of expansion and contraction of simply supported beams, is easy to construct, reduces labor costs, shortens the construction period, facilitates rapid replacement, and better achieves bridge deck continuity.

Description

Technical Field

[0001] The present invention relates to the technical field of bridges, and in particular to a precast concrete bridge deck continuous connecting plate structure and a construction method thereof. Background Art

[0002] The continuous deck structure of simply supported beam bridges was proposed in the 1970s to connect two adjacent spans of bridges. Although the bridge panels or deck pavements of two adjacent simply supported beam bridges are connected into one, the characteristics of simply supported stress are retained, expansion joints are reduced or eliminated, and a longer continuous bridge deck is obtained, but because the continuous deck structure generally uses reinforced concrete, its deformation capacity is insufficient. Under the action of negative bending moment at the main beam joint, it is difficult to avoid cracking. In addition, due to the influence of factors such as temperature changes, vehicle loads and uneven settlement of supports, the continuous structure concrete is prone to cracking, potholes and other defects in actual use. Not only does it destroy the smoothness of the bridge deck and aggravate the impact of wheels, it also fails to play a role in anti-seepage. Rainwater infiltration not only damages the supports, but also corrodes the steel bars inside the continuous structure itself, causing freeze-thaw damage to the concrete, further accelerating the damage of the continuous structure and affecting the service life of the continuous structure.

[0003] The Chinese invention patent with announcement number CN 109853377A discloses a continuous bridge deck connection structure using ultra-high performance concrete and its construction method. It meets the deformation and stress requirements of the bridge deck by giving full play to the excellent mechanical properties and deformation capacity of ultra-high performance concrete materials. However, it has defects. There is a sudden change in stiffness at the interface between concrete and ultra-high performance concrete. Under the action of temperature or load, the deformation of the two is not coordinated. The interface is a weak point and gaps will appear, and rainwater will seep through the gaps. Secondly, the structure requires the steel bars to be welded to the prefabricated or cast-in-place simply supported beam steel skeleton in advance, and the beam ends need to be embedded with angle steel. Screws are welded above the angle steel. The screws must pass through the bolt holes reserved on the ultra-high performance concrete connecting plate, and then the nuts are screwed into the screws. The construction process is complex and the production precision requirements are high, which is not conducive to promotion and application. Summary of the Invention

[0004] The purpose of the present invention is to provide a precast concrete bridge deck continuous connecting plate structure and a construction method thereof, so as to overcome the defects of the prior art such as sudden stiffness change at the interface of different materials, complex connecting plate construction process, and high construction precision requirements.

[0005] To achieve the above-mentioned object, the present invention provides the following solution: The present invention provides a precast concrete bridge deck continuous connection plate structure, comprising a support system, a simply supported beam system, an ultra-high performance concrete connection plate, and a bridge deck system disposed on the simply supported beam system; the support system comprises supports; the simply supported beam system comprises simply supported beams and studs; and the bridge deck system comprises a concrete bridge deck;

[0006] The ultra-high performance concrete connecting plate includes an anchoring area and a debonding area; the anchoring area is located between the concrete bridge deck and the debonding area, and the anchoring area and the simply supported beam are connected by bolts; the anchoring area and the debonding area are prefabricated with ultra-high performance concrete, and a non-bonding layer is provided between the debonding area and the top of the simply supported beam.

[0007] Preferably, the ultra-high performance concrete connecting plate is an ultra-high performance concrete connecting plate prefabricated in a factory.

[0008] Preferably, two rows of bolt through holes are reserved in the anchoring area of the ultra-high performance concrete connecting plate.

[0009] Preferably, the studs are shear studs.

[0010] Preferably, the simply supported beam is a steel beam or a reinforced concrete main beam, and the steel beam or the reinforced concrete main beam is erected on the support.

[0011] Preferably, the non-adhesive layer is a thin film non-adhesive layer.

[0012] The present invention also provides a construction method for a precast concrete bridge deck continuous connecting plate, which is applied to the above-mentioned precast concrete bridge deck continuous connecting plate structure and comprises the following steps:

[0013] (1) Prefabricated stepped ultra-high performance concrete connecting plate. During the prefabrication process, through holes are reserved in the anchoring areas at both ends of the connecting plate.

[0014] (2) When using steel beams, directly weld the studs to the upper flange of the steel beams; when using reinforced concrete main beams, directly pour the concrete of the main beams, and then set the studs on the upper flange of the reinforced concrete main beams;

[0015] (3) Arrange a non-bonded layer in the non-bonded area of the contact interface between the connection plate and the steel beam or reinforced concrete main beam;

[0016] (4) The prefabricated ultra-high performance concrete connecting plate is laid on the unbonded layer at the opposite ends of the adjacent steel beams or reinforced concrete main beams, and the pre-embedded bolts on the steel beams or reinforced concrete main beams pass through the through holes in the anchoring areas at both ends of the connecting plate;

[0017] (5) Cast in-situ concrete bridge deck above the steel beam or reinforced concrete main beam, so that the gaps between the bolts and the reserved through holes in the anchorage area are filled with concrete, and the embedded bolts on the prefabricated connecting plate are fully bonded to the concrete.

[0018] Preferably, in step (1), the prefabricated stepped ultra-high performance concrete connecting plate is prefabricated in a factory and pressurized and steam-cured in the factory to ensure that its curing time is not less than 15 days so that the ultra-high performance concrete can complete early shrinkage and creep; two rows of bolt through holes are reserved in the anchoring area of the connecting plate during the prefabrication process.

[0019] Preferably, the studs in step (2) are shear-resistant studs; and the non-adhesive layer in step (3) is a thin film non-adhesive layer.

[0020] Preferably, a support is provided at the bottom of the steel beam or reinforced concrete main beam, and the steel beam or reinforced concrete main beam is erected on the support.

[0021] Compared with the prior art, the present invention has achieved the following beneficial technical effects:

[0022] This invention replaces ordinary concrete with ultra-high-performance concrete within the continuous bridge deck structure. An anchoring zone is provided between the ordinary concrete bridge deck and the debonding zone. The ultra-high-performance concrete withstands environmental thermal expansion and contraction, and its excellent tensile properties improve the fatigue performance of the continuous bridge deck structure. This significantly improves the performance of the bridge deck, extending its service life and reducing maintenance frequency and costs. Compared to existing technologies, this new connecting plate offers the following key advantages:

[0023] (1) Reducing the cross-section thickness in the anchoring area can weaken the bending bearing capacity of the cross-section at this location and reduce the bending moment in the connecting plate caused by the rotation of the main beam end. At the same time, the stiffness changes more evenly, the internal force of the connecting plate is reduced, and it is more conducive to controlling the width of the crack.

[0024] (2) The construction process is simple and does not require steam curing at the construction site. The construction accuracy requirements are relatively low. Compared with the traditional cast-in-place concrete connecting plate structure, the new connecting plate can realize the rapid construction and replacement of the connecting plate structure, save labor costs, and shorten the construction period.

[0025] (3) The post-casting of the connecting plate makes the contact surface between the new and old concrete a weak surface. Under the action of tension, stress concentration is prone to occur at the interface, leading to cracking and, in turn, water seepage. The shape of the contact surface is changed from the traditional straight line to a Z-shape, which increases the contact area. The stepped shape can make the interface connection more secure, and the pre-embedded bolts increase the interaction between the two materials, solving the problem of easy cracking of the interface. At the same time, the staggered joint position improves the anti-seepage ability of the connecting plate. In order to increase the bonding effect between the two materials, a tooth-shaped joint or notch can also be made on the contact surface.

[0026] (4) The tensile strain of ultra-high performance concrete materials is generally around 0.1%, or even higher. Using ultra-high performance concrete to make connecting plates can meet the deformation requirements of bridge decks.

[0027] (5) Ultra-high performance concrete itself has excellent crack control capabilities. Compared with concrete connecting plates, it does not require as many steel bars to achieve the purpose of limiting crack width.

[0028] (6) Compared with ordinary concrete, ultra-high performance concrete has excellent durability. The new ultra-high performance concrete bridge deck continuous connection plate solves the problem of poor durability of traditional connection plates. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 This is a side structural diagram of a continuous bridge deck structure when steel beams are used;

[0031] Figure 2 This is a side structural diagram of a continuous bridge deck structure when reinforced concrete main beams are used;

[0032] Figure 3 It is a top view of the continuous structure of the bridge deck;

[0033] Figure 4 yes Figure 1 Sectional view at AA of the continuous structure of the middle bridge deck;

[0034] Figure 5 yes Figure 1 or Figure 2 Cross-section view at BB of the continuous structure of the middle bridge deck;

[0035] Figure 6 This is a schematic diagram of the side structure of a prefabricated stepped ultra-high performance concrete connecting plate;

[0036] Figure 7 This is a schematic diagram of the three-dimensional structure of a prefabricated stepped ultra-high performance concrete connecting plate;

[0037] Figure 8 This is a schematic diagram of step (1) of the construction process of an embodiment of the present invention;

[0038] Figure 9 Schematic diagram of step (2) of the construction process of an embodiment of the present invention;

[0039] Figure 10 Schematic diagram of step (3) of the construction process of an embodiment of the present invention;

[0040] Figure 11 Schematic diagram of step (4) of the construction process of an embodiment of the present invention;

[0041] Figure 12 Schematic diagram of step (5) of the construction process of an embodiment of the present invention;

[0042] In the figure: 1-support; 2-simply supported beam (steel beam or reinforced concrete beam); 3-concrete bridge deck; 4-stud; 5-anchorage area; 6-debonding area; 7-unbonded layer; 8-longitudinal reinforcement; 9-transverse reinforcement. DETAILED DESCRIPTION

[0043] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0044] The purpose of the present invention is to provide a precast concrete bridge deck continuous connecting plate structure and a construction method thereof, so as to overcome the defects of the prior art such as sudden stiffness change at the interface of different materials, complex connecting plate construction process, and high construction precision requirements.

[0045] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0046] like Figure 1-12 As shown, this embodiment provides a prefabricated stepped ultra-high performance concrete bridge deck continuous connection plate structure, including a support system, a simply supported beam system (i.e., a steel beam or reinforced concrete main beam), and a bridge deck layer system arranged on the simply supported beam system. The support system is composed of supports 1; the simply supported beam system is composed of simply supported beams 2 and bolts 4; and the bridge deck layer system includes a concrete bridge deck 3. The prefabricated stepped ultra-high performance concrete connection plate includes an anchoring area 5 and a debonding area 6; the anchoring area 5 is located between the concrete bridge deck 3 and the debonding area 6, and the anchoring area 5 and the simply supported beam 2 are connected by bolts 4; the anchoring area 5 and the debonding area 6 are prefabricated from ultra-high performance concrete, and a non-adhesive layer 7 is provided between the debonding area 6 and the top of the simply supported beam 2 using a film.

[0047] The method for constructing the connecting plate structure comprises the following steps:

[0048] (1) Prefabricated stepped ultra-high performance concrete connecting plate, during the prefabrication process of the connecting plate, through holes are reserved in the anchoring areas 5 at both ends;

[0049] (2) When a steel beam is used, the studs 4 are directly welded to the upper flange of the steel beam; when a reinforced concrete main beam is used, the concrete of the main beam is directly poured, and then the studs 4 are set at the upper flange of the reinforced concrete main beam;

[0050] (3) Arranging a non-bonding layer 7 in the non-bonding area of the contact interface between the connecting plate and the steel beam or reinforced concrete main beam;

[0051] (4) The prefabricated ultra-high performance concrete connecting plate is laid on the unbonded layer 7 at the opposite ends of the adjacent steel beams or reinforced concrete main beams, and the pre-embedded bolts 4 on the steel beams or reinforced concrete main beams are passed through the through holes of the anchoring areas 5 at both ends of the connecting plate;

[0052] (5) Cast a concrete bridge deck 3 above the steel beam or reinforced concrete main beam, fill the gaps between the bolts 4 and the reserved through holes in the anchoring area 5 with concrete, and ensure that the embedded bolts 4 on the prefabricated connecting plate are fully bonded to the concrete.

[0053] Specifically, the construction method is applied to a prefabricated stepped ultra-high performance concrete bridge deck connection plate structure, which includes a support system, a simply supported beam system (i.e., a steel beam or reinforced concrete main beam) and a bridge deck layer system arranged on the simply supported beam system.

[0054] During construction, the support system is completed first, and then the simply supported beam 2 is erected. After the simply supported beam system is erected, a thin film non-adhesive layer is laid on the non-adhesive layer 7, and then the prefabricated stepped ultra-high performance concrete connecting plate is installed in the predetermined position. Finally, the concrete bridge deck 3 is poured to complete the construction of a prefabricated concrete bridge deck continuous connecting plate structure.

[0055] In this embodiment, shear studs are used to connect the top of the simply supported beam 2 to the concrete bridge deck 3 and anchorage area 5. This ensures sufficient shear force between the simply supported beam 2 and the bridge deck to prevent slippage and separation. The debonding area connecting plate and the simply supported beam 2 are not connected, and a non-bonding layer 7 is provided between them. Some of the shear studs are welded to the top of the steel beam, while others are embedded in the precast connecting plate anchorage area 5.

[0056] The prefabricated stepped ultra-high performance concrete connecting plate is prefabricated in the factory and steam-cured at high temperature and pressure in the factory to ensure that its curing time is not less than 15 days to allow the ultra-high performance concrete to complete early shrinkage and creep. During the prefabrication process of the ultra-high performance concrete connecting plate, two rows of bolt through holes are reserved in the anchoring area 5.

[0057] The structure is constructed by assuming a prefabricated or cast-in-place simply supported beam system. After the concrete is formed, the prefabricated stepped ultra-high performance concrete connecting plates are installed in place, and then the concrete bridge deck 3 is cast on site.

[0058] It should be noted that 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 essential characteristics of the present invention. Therefore, from all perspectives, the embodiments should be regarded as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the foregoing description. It is intended that all changes that fall within the meaning and range of equivalents of the claims be included in the present invention, and any reference signs in the claims should not be construed as limiting the claims to which they relate.

[0059] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A method for constructing a continuous connecting plate of a precast concrete bridge deck, characterized in that: The following steps are involved: (1) Prefabricated stepped ultra-high performance concrete connecting plate. During the prefabrication process, through holes are reserved in the anchoring areas at both ends of the connecting plate. (2) When using steel beams, directly weld the studs to the upper flange of the steel beams; when using reinforced concrete main beams, directly pour the concrete of the main beams, and then set the studs on the upper flange of the reinforced concrete main beams; (3) Arrange a non-bonded layer in the non-bonded area of the contact interface between the connection plate and the steel beam or reinforced concrete main beam; (4) The prefabricated ultra-high performance concrete connecting plate is laid on the unbonded layer at the opposite ends of the adjacent steel beams or reinforced concrete main beams, and the pre-embedded bolts on the steel beams or reinforced concrete main beams pass through the through holes in the anchoring areas at both ends of the connecting plate; (5) Cast in-situ concrete bridge deck above the steel beam or reinforced concrete main beam, so that the gaps between the bolts and the reserved through holes in the anchorage area are filled with concrete, and the embedded bolts on the prefabricated connecting plate are fully bonded to the concrete; A precast concrete bridge deck continuous connection plate structure applied to a precast concrete bridge deck continuous connection plate construction method comprises a support system, a simply supported beam system, an ultra-high performance concrete connection plate, and a bridge deck system disposed on the simply supported beam system; the support system comprises supports; the simply supported beam system comprises simply supported beams and studs; and the bridge deck system comprises a concrete bridge deck; The ultra-high performance concrete connecting plate includes an anchoring area and a debonding area; the anchoring area is located between the concrete bridge deck and the debonding area, and the anchoring area and the simply supported beam are connected by bolts; the anchoring area and the debonding area are prefabricated from ultra-high performance concrete, and a non-bonding layer is provided between the debonding area and the top of the simply supported beam; the anchoring area of the ultra-high performance concrete connecting plate is reserved with two rows of bolt through holes.

2. The method for constructing a precast concrete bridge deck continuous connecting plate according to claim 1, characterized in that: The ultra-high performance concrete connecting plate is an ultra-high performance concrete connecting plate prefabricated in a factory.

3. The method for constructing a continuous precast concrete bridge deck connection plate according to claim 1, characterized in that: The studs are shear-resistant studs.

4. The method for constructing a continuous precast concrete bridge deck connection plate according to claim 1, characterized in that: The simply supported beam is a steel beam or a reinforced concrete main beam, and the steel beam or the reinforced concrete main beam is erected on the support.

5. The method for constructing a continuous connecting plate of a precast concrete bridge deck according to claim 1, characterized in that: The non-adhesive layer is a thin film non-adhesive layer.

6. The method for constructing a continuous connecting plate of a precast concrete bridge deck according to claim 1, characterized in that: In step (1), the prefabricated stepped ultra-high performance concrete connecting plate is prefabricated in a factory and pressurized and steam-cured in the factory to ensure that the curing time is not less than 15 days so that the ultra-high performance concrete can complete early shrinkage and creep; two rows of bolt through holes are reserved in the anchoring area of the connecting plate during the prefabrication process.

7. The method for constructing a continuous precast concrete bridge deck connection plate according to claim 1, characterized in that: The studs in step (2) are shear-resistant studs; the non-adhesive layer in step (3) is a thin film non-adhesive layer.

8. The method for constructing a precast concrete bridge deck continuous connection plate according to claim 1, characterized in that: A support is provided at the bottom of the steel beam or reinforced concrete main beam, and the steel beam or reinforced concrete main beam is erected on the support.

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