Prefabricated bridge deck, composite beam and construction method thereof

Abstract

The present application relates to the technical field of bridge engineering. Embodiments of the present application provide a prefabricated bridge deck, a composite beam, and a construction method thereof. The prefabricated bridge deck is installed on a load-bearing beam and has a first spliced ​​end coupled to the load-bearing beam. The first spliced ​​end is spaced apart to form a plurality of grooves with an open top and a closed bottom. One end of each groove extends a first preset distance inwardly of the first spliced ​​end, and the other end passes through the first spliced ​​end. By providing a groove at the first spliced ​​end and not providing steel bars extending from the first spliced ​​end, when the prefabricated bridge deck is installed on the load-bearing beam to form a composite beam, the problem of collision between the protruding steel bars and the shear connectors on the load-bearing beam is avoided, thereby achieving rapid construction.

Description

Technical Field

[0001] The present application relates to the field of bridge engineering technology, and in particular to prefabricated bridge decks, composite beams and construction methods thereof. Background Art

[0002] Steel-concrete composite bridges are beam bridges composed of exposed steel beams or steel trusses connected to a reinforced concrete deck via connectors. Steel-concrete composite beam decks are often prefabricated in factories and assembled on-site. The wet joints between the prefabricated decks are the most vulnerable and complex to construct.

[0003] Currently, wet joints are mostly formed by protruding steel bars from the ends of prefabricated bridge decks and post-cast concrete. Rebar lap splices are the most commonly used wet joint connection method, with the rebars connected by tying or welding. During the erection of steel-concrete composite beam bridge decks, shear connectors are typically installed on the top surfaces of the steel beams to ensure effective shear force transfer between the prefabricated deck and the steel beams and prevent relative slippage between the deck and the steel beams. However, during construction using existing technologies, collisions between the protruding steel bars from the deck and the shear connectors are common. Summary of the Invention

[0004] In view of this, embodiments of the present application provide a precast bridge deck, a composite beam, and a construction method thereof to solve the problem of collision between the steel bars extending from the precast bridge deck and the shear connectors in the precast bridge deck connection structure.

[0005] To solve the above technical problems, the technical solution of the embodiment of the present application is implemented as follows:

[0006] A first aspect of an embodiment of the present application provides a prefabricated bridge deck panel, which is installed on a load-bearing beam and has a first splicing end combined with the load-bearing beam. The first splicing end is formed with a plurality of grooves that are open at the top and closed at the bottom. One end of each of the grooves extends a first preset distance toward the inside of the first splicing end, and the other end passes through the first splicing end.

[0007] Furthermore, the two side walls of the prefabricated bridge deck located at the groove are respectively configured to be alternately concave and convex along the length direction of the groove.

[0008] Furthermore, the prefabricated bridge deck is formed with a pipe communicating with the groove, and the pipe extends along the inner side of the first splicing end for a second preset distance.

[0009] Furthermore, the prefabricated bridge deck is formed with a slurry outlet hole, and the slurry outlet hole is connected to the pipeline from the upper end of the prefabricated bridge deck.

[0010] Furthermore, the prefabricated bridge deck has first embedded bars spaced apart in parallel with the first splicing end edge or perpendicular to the length direction of the groove, and the first embedded bars are at least partially exposed in the groove.

[0011] Furthermore, the prefabricated bridge deck has a second splicing end that is not combined with the load-bearing beam, and the second splicing end is formed with a slot that is open at the top and closed at the bottom. The slot is arranged along the edge of the second splicing end, and the slot is opened toward one side of the second splicing end.

[0012] Furthermore, the prefabricated bridge deck has second embedded bars spaced apart along the second splicing end, and the exposed ends of the second embedded bars are closed ends, passing through the notch and protruding out of the notch.

[0013] A second aspect of an embodiment of the present application provides a composite beam, comprising: a load-bearing beam having a support surface and a shear connector arranged on the support surface; the prefabricated bridge deck in the above embodiment, wherein a plurality of the prefabricated bridge decks are spliced ​​and arranged on the load-bearing beam, the first spliced ​​ends of two adjacent prefabricated bridge decks are spaced apart on the support surface, a first seam is formed between the two first spliced ​​ends, and the shear connector is located in the first seam; a first connector is arranged in the first seam and in the two grooves corresponding to the two adjacent prefabricated bridge decks; a first casting body is cast in the first seam and the groove to connect the two adjacent prefabricated bridge decks with the load-bearing beam.

[0014] Furthermore, the shear connectors and the first connectors are arranged alternately.

[0015] Furthermore, the prefabricated bridge deck has first embedded bars spaced apart parallel to the edge of the first splicing end or perpendicular to the length direction of the groove, a pipe connected to the groove, and a slurry outlet connected to the pipe, the first embedded bars are at least partially exposed in the groove, the first embedded bars are arranged in at least two layers, and the pipe extends a second preset distance along the inner side of the first splicing end;

[0016] The first connecting member includes a plurality of first connecting ribs arranged under the first embedded ribs in the lower layer, a plurality of second connecting ribs arranged on the first embedded ribs in the upper layer, and a plurality of third connecting ribs arranged parallel to and spaced apart from the first embedded ribs. The first connecting ribs are configured to be at least partially passable through the pipe, both ends of the second connecting ribs are bent downward respectively, the third connecting ribs are located in the first joint, and the number of layers of the third connecting ribs is the same as the number of layers of the first embedded ribs.

[0017] Furthermore, the composite beam further includes: a first sealing member, disposed between the first spliced ​​end and the supporting surface to seal the lower portion of the first joint.

[0018] Furthermore, the prefabricated bridge deck has a second splicing end that is not combined with the load-bearing beam, and the second splicing end is formed with a notch that is open at the top and closed at the bottom, the notch being arranged along an edge of the second splicing end and opening toward one side of the second splicing end;

[0019] The two adjacent second splicing ends are butt-jointed, and the two notches form a second joint. The composite beam further includes a second connecting member and a second casting body. A plurality of the second connecting members are spaced apart in the second joint, and the second casting body is cast in the second joint to connect the two adjacent prefabricated bridge panels.

[0020] Furthermore, the prefabricated bridge deck has second embedded reinforcements spaced apart along the second splicing end, and the exposed ends of the second embedded reinforcements are closed ends, passing through the notch and protruding out of the notch;

[0021] The exposed ends of the second embedded reinforcements are located in the second joint, and the exposed ends of the second embedded reinforcements on both sides of the second joint are interlaced and arranged, and the exposed ends of the second embedded reinforcements on both sides form a closed loop, and the second connecting parts are provided inside and outside the closed loop.

[0022] Furthermore, the second connecting members are arranged at intervals along the inner side of the closed ring.

[0023] Furthermore, the composite beam further includes: a second sealing member, disposed between the two second spliced ​​ends to seal the lower portion of the second joint.

[0024] A third aspect of the embodiments of the present application provides a construction method of a composite beam, which is applied to the composite beam described in the above embodiments, comprising:

[0025] S1: splicing and installing a plurality of the prefabricated bridge panels on the load-bearing beam;

[0026] S2: placing the first connecting member in the first joint and in the two grooves corresponding to the two adjacent prefabricated bridge decks;

[0027] S3: Casting the first casting body to connect the two adjacent prefabricated bridge decks and the load-bearing beam.

[0028] Furthermore, step S1 includes: placing the first connecting rib of the first connecting member in the pipe of the prefabricated bridge deck.

[0029] Furthermore, step S2 includes: removing the first connecting bar from the pipe, placing it in the first joint and the groove corresponding to the two adjacent prefabricated bridge decks, below the first embedded bar of the lower layer of the prefabricated bridge deck; placing the third connecting bar of the first connecting piece in the first joint, and the third connecting bar is arranged parallel to the first embedded bar at intervals; placing the second connecting bar above the first embedded bar of the upper layer of the prefabricated bridge deck.

[0030] The prefabricated bridge deck provided in the embodiment of the present application, by providing a groove at the first splicing end and not providing steel bars extending out of the first splicing end, can avoid the collision problem between the extending steel bars and the shear connectors on the load-bearing beam when the prefabricated bridge deck is installed on the load-bearing beam to form a composite beam, thereby achieving rapid construction.

[0031] The composite beam and construction method provided in the embodiment of the present application replace the protruding steel bars of the prefabricated bridge panels in the prior art by arranging a first connecting member in the first joint between two adjacent prefabricated bridge panels and in two grooves corresponding to the two adjacent prefabricated bridge panels. This eliminates the need to control the positioning of the protruding steel bars of the prefabricated bridge panels, reduces construction accuracy, and improves construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0033] Figure 1 This is a schematic structural diagram of a composite beam according to an embodiment of the present application, showing a prefabricated bridge deck spliced ​​onto a load-bearing beam;

[0034] Figure 2 This is a schematic structural diagram of a composite beam according to a first embodiment of the present application, showing a first spliced ​​end of a prefabricated bridge deck coupled to a load-bearing beam, and a first connecting member and a first cast body provided;

[0035] Figure 3 for Figure 2 Middle AA cross-sectional view;

[0036] Figure 4 for Figure 2 Schematic diagram of the BB cross section;

[0037] Figure 5 for Figure 2 Schematic diagram of CC cross section;

[0038] Figure 6 This is a schematic structural diagram of the composite beam according to the second embodiment of the present application. Figure 2 The third connecting bar is shown on the basis;

[0039] Figure 7 This is a schematic structural diagram of a composite beam according to an embodiment of the present application, wherein a second splicing end of a prefabricated bridge deck is shown, which is not combined with a load-bearing beam, and a second connecting member and a second cast body are provided;

[0040] Figure 8 for Figure 7 Schematic top view of ; and

[0041] Figure 9 This is a flow chart of the construction method of the composite beam according to an embodiment of the present application.

[0042] Description of reference numerals:

[0043] 1. Precast bridge deck, 2. Load-bearing beam, 3. Shear connector, 4. First joint, 5. First connector, 6. First casting, 7. First seal, 8. Second joint, 9. Second connector, 10. Second casting, 11. Second seal;

[0044] 101. Groove, 102. Pipe, 103. Slurry outlet hole, 104. First embedded reinforcement, 105. Notch, 106. Second embedded reinforcement, 201. Support surface, 501. First connecting reinforcement, 502. Second connecting reinforcement, 503. Third connecting reinforcement. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0046] The various specific technical features described in the specific embodiments may be combined in any suitable manner, unless they are inconsistent. For example, different embodiments and technical solutions may be formed by combining different specific technical features. To avoid unnecessary repetition, the various possible combinations of the specific technical features in this application will not be described separately.

[0047] In the following description, the terms "first\second\third" are only used to distinguish different objects and do not mean that there is any similarity or connection between the two.

[0048] The present application provides a composite beam, such as Figure 1As shown, multiple precast bridge panels 1 are spliced ​​on the load-bearing beam 2. The precast bridge panels 1 have a first splicing end combined with the load-bearing beam 2. The load-bearing beam 2 has a support surface 201. Multiple precast bridge panels 1 are spliced ​​and set on the load-bearing beam 2. The first splicing ends of two adjacent precast bridge panels 1 are spaced apart on the support surface 201, and a first joint 4 is formed between the two first splicing ends. The precast bridge panels 1 can be made of reinforced concrete structure, and the load-bearing beam 2 can be a bridge structure in an elevated section, such as a steel beam structure in a steel-concrete composite beam. Furthermore, the steel beam structure can be a trough steel beam, an I-shaped steel beam, or a steel truss beam. Correspondingly, the support surface 201 can be the upper flange plate of the steel beam. The two precast bridge panels 1 can be spliced ​​along the longitudinal direction of the composite beam or along the transverse direction of the composite beam.

[0049] like Figures 2 and 3 As shown, the load-bearing beam 2 has a shear connector 3 arranged on the support surface 201; the shear connector 3 is located in the first joint 4, and the shear connector 3 arranged on the support surface 201 can be a shear nail or a shear bolt, etc. The specific type can be selected according to actual construction requirements.

[0050] The composite beam also includes a first connector 5 and a first cast body 6. The first connector 5 is disposed within the first joint 4 and within the two corresponding grooves 101 of the adjacent precast bridge decks 1. The first cast body 6 is cast within the first joint 4 and the grooves 101 to connect the two adjacent precast bridge decks 1 with the load-bearing beam 2. The provision of the first connector 5 and the first cast body 6 to connect the two adjacent precast bridge decks 1 with the load-bearing beam 2 avoids the problem of on-site welding between the steel bars, enabling rapid construction. The first connector 5 can preferably be made of ribbed threaded steel bars or steel rods to enhance connectivity with the first cast body 6. The first cast body 6 can be made of ultra-high performance concrete.

[0051] Shear connectors 3 are positioned on support surface 201 and embedded in first cast body 6. They effectively transmit shear forces, prevent relative slippage between precast bridge deck 1 and load-bearing beam 2, and ensure a reliable structural connection. It should be noted that the term "joined" refers to the precast bridge deck 1 and load-bearing beam 2 being joined together into a single, load-bearing structure via first connector 5, shear connectors 3, and first cast body 6.

[0052] In the existing technology, when prefabricated bridge panels are manufactured in the factory, steel bars are extended, and there is a problem of collision with shear connectors when the prefabricated bridge panels are installed. In addition, in order to effectively transmit force between the steel bars, appropriate connection measures are generally taken for the steel bars, such as welding and binding, and sufficient anchorage length or overlap length needs to be provided for the steel bars, which has the disadvantage of a large workload for on-site steel bar connection.

[0053] Therefore, an embodiment of the present application provides a prefabricated bridge deck having a first splicing end combined with a load-bearing beam 2, and the first splicing end is spaced apart to form a plurality of grooves 101 with an upper open portion and a lower closed portion, one end of each groove 101 extends a first preset distance toward the inside of the first splicing end, and the other end passes through the first splicing end.

[0054] By setting a groove 101 at the first splicing end of the prefabricated bridge panel 1 and not setting a steel bar extending out of the first splicing end, a first connecting member, such as a steel bar or a steel rod, is placed in the first joint 4 and in the two grooves 101 corresponding to the two adjacent prefabricated bridge panels 1 to replace the protruding steel bars of the prefabricated bridge panel in the prior art. There is no need to control the positioning of the protruding steel bars of the prefabricated bridge panel, thereby improving the installation efficiency of the prefabricated bridge panel 1 and reducing the construction accuracy requirements.

[0055] Furthermore, the shear connectors 3 and the first connectors 5 are arranged alternately, so that when the prefabricated bridge deck 1 is installed on the load-bearing beam 2 to form a composite beam, the collision problem between the protruding steel bars and the shear connectors on the load-bearing beam can be effectively avoided, and the alternating arrangement facilitates the laying of the first connector 5 in the first joint 4 and the two grooves 101.

[0056] Furthermore, a plurality of shear connectors 3 can be provided on the supporting surface 201 of the first joint 4 , with each adjacent shear connector 3 being spaced apart. In this way, the plurality of shear connectors 3 can be arranged in a matrix.

[0057] Furthermore, pouring the first casting body 6 into the groove 101 increases the contact area between the grouting material and the precast bridge deck 1, compared to pouring only the first joint 4 area between the two first spliced ​​ends. This effectively connects the load-bearing beam 2 and the two adjacent precast bridge decks 1, improving structural safety. In one embodiment, the side walls of the precast bridge deck 1 located in the groove 101 are configured to have alternating concave and convex shapes along the length of the groove 101. The side walls of the groove 101 can be serrated or gourd-shaped, further increasing the contact area between the precast bridge deck 1 and the grouting material and enhancing bonding strength.

[0058] It should be noted that the specifications of the first connector 5 and the first preset distance of the grooves 101 are determined based on structural calculations. The first preset distance is greater than 20d, where d is the diameter of the first connector 5. To minimize excessive weakening of the precast bridge deck 1 due to the notching, the width of each groove is set to 5 to 8 cm. The shear connectors 3 and first connectors 5 are arranged alternately, and the spacing of the grooves 101 must match that of the shear connectors 3, at least not less than the width of the shear connectors 3. A suitable spacing of 15 to 20 cm is recommended.

[0059] In order to increase the connectivity between the two prefabricated bridge panels 1, in one embodiment, Figures 4 and 5As shown, the precast bridge deck 1 has first embedded bars 104 spaced parallel to the edge of the first splicing end. The first embedded bars 104 are at least partially exposed within the groove 101, ensuring a tight connection between the first cast body 6 and the first embedded bars 104, thereby enhancing the overall rigidity of the structure. In other embodiments, if the edge of the first splicing end is irregularly shaped, the first embedded bars 104 may be arranged perpendicular to the length of the groove 101.

[0060] Specifically, the first embedded reinforcement 104 is provided in at least two layers. Figure 4 As shown, at least one layer is provided on the prefabricated bridge deck 1 exposed at the lower portion of the groove 101, and another layer is provided at the lower portion of the interval exposed at the upper portion of the groove 101. Of course, multiple layers can also be provided between the two layers to enhance the structural stress reliability.

[0061] In one embodiment, Figure 4 As shown, the first connecting member 5 includes a plurality of first connecting ribs 501 arranged under the lower first embedded ribs 104, a plurality of second connecting ribs 502 arranged on the upper first embedded ribs 104, and a plurality of third connecting ribs 503 arranged parallel to the first embedded ribs 104 and spaced apart.

[0062] Specifically, the first connecting rib 501, the second connecting rib 502, and the third connecting rib 503 are arranged in layers. With the position of the first embedded rib 104 as a reference, the first connecting rib 501 is set at the bottom of the first embedded rib 104. The third connecting rib 503 can be arranged at intervals on the upper end of the first connecting rib 501 in a direction parallel to the first embedded rib 104. The third connecting rib 503 is arranged alternately with the shear connector 3 in a direction parallel to the first embedded rib 104. A layer of steel bars parallel to the first connecting rib 501 can be set on the upper end of the third connecting rib 503, and stacked layer by layer. According to the spatial range, multiple layers of reinforcing ribs, such as steel bars, can be set in the horizontal and vertical directions of the first joint 4. Among them, the multiple layers of steel bars may include the second connecting rib 502 set on the upper first embedded rib 104.

[0063] Furthermore, both ends of the second connecting rib 502 are bent downwards to form a nearly closed loop with the first connecting rib 501. The two ends bent downwards can abut against the sidewalls of the groove 101, so as to firmly clamp the second connecting rib in the groove 101.

[0064] Further, if Figures 5 and 6 As shown, the third connecting rib 503 is located in the first joint 4, so as to be arranged in a multi-layer stack with the first connecting rib 501 and the second connecting rib 502.

[0065] Furthermore, the number of layers of the third connecting bars 503 can be the same as or different from the number of layers of the first pre-embedded bars 104, depending on actual construction needs. It should be noted that the number of layers of the third connecting bars 503 is preferably at least two, corresponding to the lower and upper layers of the first pre-embedded bars 104, respectively. This facilitates the overlapping arrangement of the first connecting bars 501 and the second connecting bars 502, thereby increasing the structural reliability of the connection.

[0066] Since the first connecting rib 501 is arranged below the first embedded rib 104, after the adjacent two prefabricated bridge panels are installed, the first connecting rib 501 is blocked by the first embedded rib 104 or the third connecting rib 503 and cannot be placed below. Figure 4 As shown, the prefabricated bridge deck 1 is formed with a pipe 102 connected to the groove 101. The pipe 102 extends along the inner side of the first splicing end for a second preset distance. When the first connecting bar 501 is configured to be at least partially passable within the pipe 102, the first connecting bar 501 can be a straight bar. The pipe 102 can serve as a temporary placement channel for the first connecting bar 501. The second preset distance is not less than the length of the first connecting bar 501. Here, the second preset distance should be understood as the sum of the first preset distance and the length of the pipe 102, measured from the edge of the first splicing end. The diameter of the pipe 102 is not less than the diameter of the first connecting bar 501 and can be selected to be 5 cm.

[0067] By setting up the pipe 102, when a prefabricated bridge deck 1 is installed on the load-bearing beam 2, the first connecting reinforcement 501 is placed in the pipe 102. When another prefabricated bridge deck is installed on the load-bearing beam to form a first joint with the previous prefabricated bridge deck, the first connecting reinforcement 501 can be removed from the pipe 102 and placed in two corresponding grooves 101.

[0068] In one embodiment, the precast bridge deck 1 is formed with a grouting hole 103, which connects to the pipe 102 from the upper end of the precast bridge deck 1. When the first casting body 6 is poured into the first joint 4, the grouting hole 103 connected to the pipe 102 can be checked to determine whether the pipe 102 has been filled with concrete, thereby preventing the problem of poor connection strength that may occur due to the placement of the pipe hole.

[0069] In one embodiment, Figures 4 and 5 As shown, the composite beam further includes a first sealing member 7 disposed between the first spliced ​​end and the support surface 201 to seal the lower portion of the first joint 4. The width of the first sealing member 7 is set according to the combined width of the precast bridge deck 1 and the load-bearing beam 2, which is generally about 5 cm.

[0070] In existing steel-concrete composite beam structures, the portion between adjacent bridge decks not connected to the steel beam is often constructed using the hanging formwork method, which requires extensive on-site formwork installation and removal. Furthermore, the wet weather during the rainy season can easily dampen the wooden formwork, affecting the setting of the concrete components and resulting in uneven and pitted surfaces when the formwork is removed.

[0071] In order to solve the above problems, the present invention also provides a composite beam. Figure 1 As shown, the prefabricated bridge deck 1 has a second splicing end that is not combined with the load-bearing beam 2, and the two adjacent second splicing ends are butt-jointed to form a second joint 8 between the two second splicing ends; the composite beam also includes a second connecting member 9 and a second casting body 10, and a plurality of second connecting members 9 are spaced apart in the second joint 8, and the second casting body 10 is cast in the second joint 8 to connect the two adjacent prefabricated bridge decks 1.

[0072] Specifically, such as Figure 7 As shown, the second splicing end of the precast bridge deck 1 that is not connected to the load-bearing beam 2 is formed with a notch 105 that is open at the top and closed at the bottom. The notch 105 is set along the edge of the second splicing end, and the notch 105 is set to open on one side of the second splicing end. The two adjacent second splicing ends are butt-jointed, and the two notches 105 form a second joint 8. The notch shape is not restricted and can be semi-U-shaped or L-shaped. In the embodiment of the present application, by providing a notch 105 that is open at the top and closed at the bottom at the second splicing end, the two adjacent notches 105 can be directly butted together to form the second joint 8. There is no need to set up a template. By setting a second connecting member 9 in the second joint 8 and casting a second casting body 10, the two adjacent precast bridge decks 1 can be effectively connected, thereby speeding up the construction progress.

[0073] Different from the first joint end of the prefabricated bridge deck 1 and the load-bearing beam 2, in this embodiment, the second joint end is not connected to the load-bearing beam. When two adjacent second joint ends are butt-jointed, there is no need to consider the problem of collision with the shear connector 3. In this way, a protruding rib can be provided to strengthen the connection of the second joint. In one embodiment, Figures 7 and 8 As shown, the prefabricated bridge deck 1 has second embedded bars 106 spaced apart along the second splicing end. The second embedded bars 106 pass through the notch 105 and protrude out of the notch.

[0074] Furthermore, the exposed end of the second embedded reinforcement 106 is a closed end, which can be J-shaped or U-shaped, for example, a ring reinforcement. Compared with straight reinforcement, the ring reinforcement has greater rigidity and higher connection structure strength.

[0075] When the two adjacent second splicing ends are butt-jointed, the exposed ends of the second embedded bars 106 are located inside the second seam 8, and the exposed ends of the second embedded bars 106 on both sides of the second seam 8 are interlaced and staggered. The exposed ends of the second embedded bars 106 on both sides form a closed loop, and second connectors 9 are provided inside and outside the closed loop. The spacing distance between the second embedded bars 106 is at least the diameter distance of one second embedded bar 106, so that the second embedded bars 106 on both sides of the second seam 8 are interlaced and staggered, which is convenient for buckling and overlapping each other. It is beneficial to further improve the structural firmness and stability of the second seam 8. In addition, the second connector 9 can be set inside the closed loop according to construction needs, can be set outside the closed loop, or can be set inside and outside the closed loop. For example, in one embodiment, the second connector 9 is spaced apart on the inner side of the closed loop.

[0076] In one embodiment, the composite beam further includes: a second sealing member 11 , disposed between the two second spliced ​​ends to seal the lower portion of the second joint 8 .

[0077] The third aspect of the present application provides a construction method for one of the above composite beams, such as Figure 9 Shown, including:

[0078] S1: splicing and installing a plurality of the prefabricated bridge panels on the load-bearing beam;

[0079] S2: placing the first connecting member in the first joint and in the two grooves corresponding to the two adjacent prefabricated bridge decks;

[0080] S3: Casting the first casting body to connect the two adjacent prefabricated bridge decks and the load-bearing beam.

[0081] Step S1 specifically includes: placing the first connecting bar of the first connecting member in the pipe of the prefabricated bridge deck, so that after the two prefabricated bridge decks 1 are spliced ​​together, the first connecting member 5 cannot be placed under the first embedded bar 104 of the lower layer.

[0082] Step S2 specifically includes: removing the first connecting bar from the pipe and placing it in the first joint and the corresponding grooves of the two adjacent prefabricated bridge panels, below the first embedded bar of the lower layer of the prefabricated bridge panels; placing the third connecting bar of the first connecting member at the upper end of the connecting bar in the first joint, and the third connecting bar is arranged parallel to the first embedded bar at intervals; placing the second connecting bar above the first embedded bar on the upper layer of the upper prefabricated bridge panel.

[0083] Specifically, when installing prefabricated bridge panels, when one prefabricated bridge panel 1 is installed on the load-bearing beam 2, the first connecting rib 501 is placed in the pipe 102. When another prefabricated bridge panel is installed on the load-bearing beam 2 to form a first joint 4 with the previous prefabricated bridge panel 1, the first connecting rib 501 can be removed from the pipe 102 and placed in two corresponding grooves 101, and then the third connecting rib 503 is placed.

[0084] The first connecting rib 501, the second connecting rib 502 and the third connecting rib 503 are arranged in layers. The third connecting rib 503 can be arranged at intervals on the upper end of the first connecting rib 501 parallel to the direction of the first embedded rib 104, and multiple layers of steel bars can be arranged between the first connecting rib 501 and the second connecting rib 502.

[0085] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the above embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the above embodiments, or to replace some of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions claimed to be protected by the present application.

Claims

1. A prefabricated bridge deck, mounted on a load-bearing beam, characterized in that: It has a first splicing end combined with the load-bearing beam, and the first splicing end is formed with a plurality of grooves with an open upper portion and a closed lower portion at intervals, one end of each of the grooves extends a first preset distance toward the inner side of the first splicing end, and the other end passes through the first splicing end; the prefabricated bridge deck is formed with a pipe connected to the groove, and the pipe extends a second preset distance along the inner side of the first splicing end; the prefabricated bridge deck has a second splicing end that is not combined with the load-bearing beam, and the second splicing end is formed with a notch with an open upper portion and a closed lower portion, the notch is arranged along the edge of the second splicing end, and the notch is arranged to open toward one side of the second splicing end; the first splicing end is not provided with a steel bar extending out of the first splicing end.

2. The prefabricated bridge deck according to claim 1, characterized in that: The two side walls of the prefabricated bridge deck located at the groove are respectively configured to be alternately concave and convex along the length direction of the groove.

3. The prefabricated bridge deck according to claim 1, characterized in that: The prefabricated bridge deck is formed with a slurry outlet hole, and the slurry outlet hole is connected to the pipeline from the upper end of the prefabricated bridge deck.

4. The prefabricated bridge deck according to claim 1, characterized in that: The prefabricated bridge deck has first embedded bars spaced apart in parallel with the first splicing end edge or perpendicular to the length direction of the groove, and the first embedded bars are at least partially exposed in the groove.

5. The prefabricated bridge deck according to claim 1, characterized in that: The prefabricated bridge deck has second embedded reinforcements spaced apart along the second splicing end, and the exposed ends of the second embedded reinforcements are closed ends, passing through the notches and protruding out of the notches.

6. A composite beam, characterized in that: include: A load-bearing beam having a support surface and a shear connector disposed on the support surface; The prefabricated bridge deck according to claim 1 or 2, wherein a plurality of the prefabricated bridge decks are spliced ​​and arranged on the load-bearing beam, the first spliced ​​ends of two adjacent prefabricated bridge decks are spaced apart on the support surface, a first joint is formed between the two first spliced ​​ends, and the shear connector is located in the first joint; A first connecting member is provided in the first joint and in the two grooves corresponding to the two adjacent prefabricated bridge decks; a first casting body, cast in the first joint and the groove to connect two adjacent prefabricated bridge decks and the load-bearing beam; The first connecting rib of the first connecting member is placed in the pipe and is movable relative to the pipe; The shear connectors and the first connectors are arranged alternately.

7. The composite beam according to claim 6, wherein: The prefabricated bridge deck has first embedded bars spaced parallel to the edge of the first splicing end or perpendicular to the length direction of the groove, a pipe connected to the groove, and a slurry outlet connected to the pipe, the first embedded bars are at least partially exposed in the groove, the first embedded bars are arranged in at least two layers, and the pipe extends along the inner side of the first splicing end for a second preset distance; The first connecting member includes a plurality of first connecting ribs arranged under the first embedded ribs in the lower layer, a plurality of second connecting ribs arranged on the first embedded ribs in the upper layer, and a plurality of third connecting ribs arranged parallel to and spaced apart from the first embedded ribs. The first connecting ribs are configured to be at least partially passable through the pipe, both ends of the second connecting ribs are bent downward respectively, the third connecting ribs are located in the first joint, and the number of layers of the third connecting ribs is the same as the number of layers of the first embedded ribs.

8. The composite beam according to claim 6, wherein: The composite beam further comprises: A first sealing member is provided between the first splicing end and the supporting surface to seal the lower portion of the first seam.

9. The composite beam according to claim 6, wherein: The prefabricated bridge deck has a second splicing end that is not combined with the load-bearing beam, and the second splicing end is formed with a notch that is open at the top and closed at the bottom, the notch being arranged along an edge of the second splicing end and opening toward one side of the second splicing end; The two adjacent second splicing ends are butt-jointed, and the two notches form a second joint. The composite beam further includes a second connecting member and a second casting body. A plurality of the second connecting members are spaced apart in the second joint, and the second casting body is cast in the second joint to connect the two adjacent prefabricated bridge panels.

10. The composite beam according to claim 9, wherein: The prefabricated bridge deck has second embedded reinforcements spaced apart along the second splicing end, the exposed ends of the second embedded reinforcements being closed ends, passing through the notches and protruding out of the notches; The exposed ends of the second embedded reinforcements are located in the second joint, and the exposed ends of the second embedded reinforcements on both sides of the second joint are interlaced and staggered, forming a closed loop, and the second connecting piece is provided inside and outside the closed loop.

11. The composite beam according to claim 10, wherein: The second connecting members are arranged at intervals along the inner side of the closed ring.

12. The composite beam according to claim 9, wherein: The composite beam further comprises: A second sealing member is provided between the two second splicing ends to seal the lower portion of the second seam.

13. A construction method for a composite beam, characterized in that: The composite beam according to claim 7 comprises: S1: splicing and installing a plurality of the prefabricated bridge panels on the load-bearing beam, and placing the first connecting rib of the first connecting member into the pipe of the prefabricated bridge panel; S2: placing the first connecting member in the first joint and in the two grooves corresponding to the two adjacent prefabricated bridge decks; S3: Casting the first casting body to connect the two adjacent prefabricated bridge decks and the load-bearing beam.

14. The construction method according to claim 13, characterized in that: Step S2 includes: Remove the first connecting reinforcement from the pipe and place it in the first joint and the grooves corresponding to the two adjacent prefabricated bridge decks, below the first embedded reinforcement in the lower layer of the prefabricated bridge deck; Placing a third connecting rib of the first connecting member in the first joint, wherein the third connecting rib is arranged parallel to and spaced apart from the first embedded rib; The second connecting reinforcement is placed above the first embedded reinforcement on the upper layer of the prefabricated bridge deck.

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