Prefabricated bridge deck wet joint structure and construction method thereof

Abstract

The present invention relates to the technical field of bridge engineering, and discloses a prefabricated bridge deck wet joint structure and a construction method thereof, wherein the wet joint structure comprises a plurality of prefabricated bridge decks, adjacent prefabricated bridge decks are spaced to form joints, the prefabricated bridge decks on both sides are provided with a plurality of steel bar assemblies extending to the outside of the prefabricated bridge decks near the joints, the steel bar assemblies comprise long spliced ​​steel bars and short spliced ​​steel bars distributed along the thickness direction of the prefabricated bridge decks, the long spliced ​​steel bars on both sides overlap with each other to form a main ring-shaped steel bar frame, and the short spliced ​​steel bars on one side overlap with the long spliced ​​steel bars on the other side to form a secondary ring-shaped steel bar frame. After the long spliced ​​steel bars and the short spliced ​​steel bars of the present invention are overlapped, a closed ring steel bar frame is formed, and a force transmission path is clear; no welding is required on site, which shortens the construction period; no transverse through steel bars need to be placed on site, which improves the construction efficiency, and the overall performance is better, which improves the bearing capacity of the wet joint.

Description

Technical Field

[0001] The invention relates to the technical field of bridge engineering, in particular to a prefabricated bridge deck wet joint structure and a construction method thereof. Background Art

[0002] The speed of bridge construction, especially the time for bridge replacement and bridge repair, has become a key issue to reduce the time of traffic and trade interruption. For rapid construction, a promising system is prefabricated assembled bridges. This type of bridge is prefabricated in the factory and transported to the construction site to connect the prefabricated bridge panels through wet joints. The prefabricated bridge panels are connected through wet joints.

[0003] Traditional prefabricated bridge decks are often welded at wet joints, which requires a lot of construction work. For U-shaped steel bar wet joints, after the U-shaped steel bars are spliced ​​on site, transverse through-steel bars need to be placed and tied to strengthen the connection for overall stress, which reduces construction efficiency and results in poor bearing capacity of the wet joints. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the defects in the prior art that the wet joints of prefabricated bridge decks are tied with transverse penetrating steel bars, resulting in poor bearing capacity of the wet joints and low construction efficiency, and to provide a prefabricated bridge deck wet joint structure and a construction method thereof.

[0005] The present invention solves the above technical problems through the following technical solutions:

[0006] A prefabricated bridge deck wet joint structure comprises a plurality of prefabricated bridge decks, wherein adjacent prefabricated bridge decks are spaced to form joints, and the prefabricated bridge decks on both sides are provided with a plurality of steel bar assemblies extending to the outside of the prefabricated bridge decks near the joints, and the plurality of steel bar assemblies are distributed transversely along the prefabricated bridge decks, wherein the steel bar assemblies each comprise long spliced ​​steel bars and short spliced ​​steel bars distributed along the thickness direction of the prefabricated bridge decks, the long spliced ​​steel bars on both sides are overlapped with each other to form a main annular steel bar frame, the short spliced ​​steel bars on one side are overlapped with the long spliced ​​steel bars on the other side to form a secondary annular steel bar frame, and the prefabricated bridge decks on both sides and the main annular steel bar frame and the secondary annular steel bar frame are formed as a whole by pouring concrete.

[0007] In this scheme, the steel bar assembly includes long spliced ​​steel bars and short spliced ​​steel bars distributed along the thickness direction of the prefabricated bridge deck, which can form a double-layer steel bar distributed along the thickness direction of the prefabricated bridge deck, and the long spliced ​​steel bars on both sides are overlapped to form a main ring-shaped steel bar frame, and the short spliced ​​steel bars on one side and the long spliced ​​steel bars on the other side are overlapped to form a secondary ring-shaped steel bar frame. The double steel bar frame of the main ring-shaped steel bar frame and the secondary ring-shaped steel bar frame is used to improve the bearing capacity in the wet joint; the traditional process of tying horizontal through steel bars is reduced, and the construction efficiency is improved.

[0008] Preferably, the long spliced ​​steel bars and the short spliced ​​steel bars each include two straight sections, two bent sections and an equivalent transverse reinforcement section, the two bent sections are respectively connected to the ends of the two straight sections, the equivalent transverse reinforcement section extends in the transverse direction of the prefabricated bridge deck, and the two ends of the equivalent transverse reinforcement section are respectively connected to the ends of the two bent sections.

[0009] In this scheme, the equivalent transverse reinforcement segment can be equivalent to the transverse penetrating reinforcement of the traditional U-shaped reinforcement. The transverse penetrating reinforcement of the traditional U-shaped reinforcement is tied and connected with the longitudinal U reinforcement, while the equivalent transverse reinforcement segment of this scheme is an integral reinforcement with the longitudinal reinforcement (straight section of short spliced ​​reinforcement / long spliced ​​reinforcement). The overall bending stiffness and crack resistance are improved, the integrity is better, the bearing capacity can be improved, and the seismic performance of the structure is better.

[0010] Preferably, in the steel bar assembly, at least one of the equivalent transverse reinforcement segment of the short spliced ​​steel bars and the equivalent transverse reinforcement segment of the long spliced ​​steel bars is located on the circumferential surface of the closed ring steel bar frame.

[0011] In this solution, the equivalent transverse reinforcement segment is arranged on the circumferential surface of the closed ring steel frame, and the equivalent transverse reinforcement segment can enhance the shear failure resistance of the core concrete column in the closed ring steel frame.

[0012] Preferably, each equivalent transverse reinforcement segment in the closed ring-shaped steel reinforcement frame is evenly distributed along the circumferential direction of the circumferential surface of the closed ring-shaped steel reinforcement frame.

[0013] In this scheme, the steel bars are more evenly distributed in the thickness direction of the precast bridge deck, which can improve the bearing capacity of the structure and effectively control the width of concrete cracks.

[0014] Preferably, in the two overlapping steel bar assemblies, the long spliced ​​steel bars of one of the steel bar assemblies are located above the short spliced ​​steel bars, and the long spliced ​​steel bars of the other steel bar assembly are located below the short spliced ​​steel bars.

[0015] In this solution, the long spliced ​​steel bars and the short spliced ​​steel bars in each steel bar assembly are arranged up and down, and two adjacent prefabricated bridge panels can be spliced ​​by left-right alignment, which makes the splicing operation convenient.

[0016] Preferably, the long spliced ​​steel bars on one side of the prefabricated bridge deck are all located above the short spliced ​​steel bars, and the long spliced ​​steel bars on the other side are all located below the short spliced ​​steel bars.

[0017] In this scheme, the long spliced ​​steel bars and the short spliced ​​steel bars on both sides of the precast bridge deck are arranged in the same manner, so that when the precast bridge deck is installed, all the long spliced ​​steel bars / short spliced ​​steel bars on the same side of the precast bridge deck can be spliced ​​with all the short spliced ​​steel bars / long spliced ​​steel bars on the same side of the other precast bridge deck.

[0018] Preferably, the bending sections are all semicircular.

[0019] In this solution, two semicircular bending sections can form a closed annular space after being spliced ​​together.

[0020] Preferably, the height of the bent section of the short spliced ​​steel bar along the thickness direction of the prefabricated bridge deck is 1 / 2 of the height of the bent section of the long spliced ​​steel bar along the thickness direction of the prefabricated bridge deck.

[0021] In this solution, it is convenient to realize that the equivalent transverse reinforcement section of the short spliced ​​reinforcement is located in the middle of the height position of the closed ring reinforcement frame.

[0022] Preferably, the horizontal projection of the bent section of the short spliced ​​steel bars is attached to the inner side of the horizontal projection of the bent section of the long spliced ​​steel bars.

[0023] In this solution, after the left and right steel bar components are spliced, the side of the bent section of the short spliced ​​steel bar is just attached to the inner side of the long spliced ​​steel bar, which is convenient for binding the spliced ​​long spliced ​​steel bar and the short spliced ​​steel bar.

[0024] Preferably, the closed ring steel bar frame is located in the middle of the wet joint along the direction along the bridge.

[0025] In this solution, the forces in the wet joint are more balanced.

[0026] A construction method of a wet joint structure, used for the construction of the wet joint structure of a prefabricated bridge deck, is characterized by comprising the following steps:

[0027] Step 1, prefabricating a bridge deck in a factory, and pre-embedding the long spliced ​​steel bars and the short spliced ​​steel bars transversely along the prefabricated bridge deck;

[0028] Step 2: transport the prefabricated bridge deck to the site and hoist it, and align and splice two adjacent prefabricated bridge decks;

[0029] Step 3: Use steel bar tying wire to tie and connect the long spliced ​​steel bars and the short spliced ​​steel bars on both sides one by one;

[0030] Step 4: Cast concrete between the precast bridge panels to form the overall structure of the precast bridge panels.

[0031] Preferably, in step 2, during hoisting, the long spliced ​​steel bars are installed first at the bottom and the short spliced ​​steel bars are installed at the top.

[0032] In this solution, it is more convenient to operate when the long spliced ​​steel bars on both sides overlap each other.

[0033] The positive and progressive effects of the present invention are: after the steel bar components on both sides are overlapped, a main ring steel bar frame and a secondary ring steel bar frame are formed, and the force transmission path is clear; no welding is required on site, which shortens the construction period; no horizontal through steel bars are required on site, which improves construction efficiency, and the overall performance is better, the overall bending stiffness and crack resistance are improved, and the bearing capacity of the wet joint is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a structural effect diagram of the prefabricated bridge deck after wet joint splicing of the present invention.

[0035] Figure 2 This is a structural rendering of the prefabricated bridge deck before wet joint splicing of the present invention.

[0036] Figure 3 This is a vertical view of the prefabricated bridge deck after wet joint splicing of the present invention.

[0037] Figure 4 This is a vertical view of the prefabricated bridge deck before wet joint splicing of the present invention.

[0038] Figure 5 This is a plan view of the prefabricated bridge deck after wet joint splicing of the present invention.

[0039] Reference numerals:

[0040] Precast bridge deck 1

[0041] Long spliced ​​steel bar 2

[0042] Short spliced ​​steel bar 3

[0043] Cast-in-place concrete 4 DETAILED DESCRIPTION

[0044] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples.

[0045] A precast bridge deck wet joint structure, such as Figures 1 to 5 As shown, it comprises a plurality of prefabricated bridge panels 1, and adjacent prefabricated bridge panels 1 are spaced apart to form joints along the direction of the bridge.

[0046] The precast bridge deck 1 is provided with a plurality of steel bar assemblies extending to the outside of the precast bridge deck 1 near the joint side. The plurality of steel bar assemblies are distributed transversely along the precast bridge deck 1. Each steel bar assembly includes a long spliced ​​steel bar 2 and a short spliced ​​steel bar 3. The long spliced ​​steel bar 2 and the short spliced ​​steel bar 3 are pre-buried in the precast bridge deck 1 in advance. Figure 2 As shown, the long spliced ​​steel bars 2 and the short spliced ​​steel bars 3 on one side of the precast bridge deck 1 are arranged in such a way that the long spliced ​​steel bars 2 are at the bottom and the short spliced ​​steel bars 3 are at the top, while the arrangement on the other side is the opposite.

[0047] After the precast bridge panels 1 are transported to the site, they are hoisted one by one, and the long spliced ​​steel bars 2 and the short spliced ​​steel bars 3 are tied and connected by using binding wires, and concrete 4 is cast between the precast bridge panels 1 to form an integral structure.

[0048] The long spliced ​​steel bars 2 and the short spliced ​​steel bars 3 both extend out of the near-joint side of the prefabricated bridge deck 1. The shapes and structures of the two are as follows: Figure 2 and Figure 3 As shown: the extended part of the long spliced ​​steel bar 2 includes two straight sections, two bent sections and an equivalent transverse reinforcement section. The two straight sections extend along the direction of the bridge; the two bent sections are semicircular, and the two bent sections are respectively connected to the ends of the two straight sections; the equivalent transverse reinforcement section extends in the transverse direction of the prefabricated bridge deck 1, and the two ends of the equivalent transverse reinforcement section are respectively connected to the ends of the two bent sections. Among them, in each steel bar assembly, the bent section of the long spliced ​​steel bar 2 is bent in the direction close to the short spliced ​​steel bar 3, and the bent section of the short spliced ​​steel bar 3 is bent in the direction close to the long spliced ​​steel bar 2, and the bent section of the short spliced ​​steel bar 3 is located inside the bent section of the long spliced ​​steel bar 2.

[0049] The short spliced ​​steel bars 3 and the long spliced ​​steel bars 2 have the same shape and structure, but are different in size, specifically: Figure 3 As shown, the bending radius of the bending portion of the short spliced ​​steel bar 3 is 1 / 2 of the bending radius of the bending section of the long spliced ​​steel bar 2, and the joint width is the sum of the straight section length of the short spliced ​​steel bar 3, the straight section length of the long spliced ​​steel bar 2 and the radius length of the long spliced ​​steel bar 2; combined with Figure 1 and Figure 5 As shown, the width of the short spliced ​​steel bars 3 along the transverse direction of the precast bridge deck 1 is the width of the long spliced ​​steel bars 2 along the transverse direction of the precast bridge deck 1 minus twice the diameter of the long spliced ​​steel bars 2 .

[0050] After the long spliced ​​steel bars 2 and the short spliced ​​steel bars 3 are overlapped, a closed ring steel bar frame is formed, that is, each steel bar assembly has a closed ring steel bar frame, and the equivalent transverse reinforcement sections of the long spliced ​​steel bars 2 and the short spliced ​​steel bars 3 are all located on the circumferential surface of the closed ring steel bar frame, and the four equivalent transverse reinforcements in each steel bar assembly are evenly distributed along the circumferential surface of the closed ring steel bar frame. Specifically, in the closed ring steel bar frame, the long spliced ​​steel bars on both sides overlap each other to form a main ring steel bar frame, and the short spliced ​​steel bars on one side overlap each other with the long spliced ​​steel bars on the other side to form a secondary ring steel bar frame.

[0051] The joint is filled with cast-in-place concrete 4, and two adjacent prefabricated bridge decks 1 and the main ring steel frame and the auxiliary ring steel frame are connected into a whole through the adjacent cast-in-place concrete 4. The strength of the cast-in-place concrete 4 is C40-C60 or ultra-high performance concrete.

[0052] Compared with the traditional U-shaped steel bar binding method using transversely penetrating steel bars, the advantages of the present invention are as follows:

[0053] (1) The equivalent transverse reinforcement section of the present invention can be equivalent to the transverse through-steel reinforcement of the traditional U-shaped reinforcement. The transverse through-steel reinforcement of the traditional U-shaped reinforcement is tied and connected with the longitudinal U-steel, while the equivalent transverse reinforcement section of the present invention is an integral steel bar with the longitudinal steel bar (the straight section of the short spliced ​​steel bar 3 / long spliced ​​steel bar 2), which has better integrity and can improve the bearing capacity. (2) The steel bars of the present invention are more evenly distributed in the thickness direction of the prefabricated bridge deck 1, which can improve the structural bearing capacity and effectively control the width of concrete cracks.

[0054] The construction method of the above-mentioned prefabricated bridge deck wet joint structure comprises the following steps:

[0055] Step 1, prefabricating a bridge deck 1 in a factory, and pre-embedding long splicing steel bars 2 and short splicing steel bars 3 transversely along the prefabricated bridge deck 1;

[0056] Step 2, transport the prefabricated bridge deck 1 to the site, install the long spliced ​​steel bars 2 at the bottom and the short spliced ​​steel bars 3 at the top first during hoisting, and then align and splice in sequence (in other embodiments, theoretically, each prefabricated bridge deck 1 can also be align-and-splice in the air, and this situation is not limited to the long spliced ​​steel bars 2 at the bottom and the short spliced ​​steel bars 3 at the top first. The splicing order can be arbitrarily selected, but in the actual construction process, the prefabricated bridge deck 1 is usually installed by hoisting a single piece. Therefore, in this embodiment, the long spliced ​​steel bars 2 at the bottom and the short spliced ​​steel bars 3 at the top are installed first during hoisting, which is the best installation method);

[0057] Step 3, use the steel bar wire to tie and connect the long spliced ​​steel bars 2 and the short spliced ​​steel bars 3 one by one, and tie four parts (the long spliced ​​steel bars 2 on the left and the short spliced ​​steel bars 3 on the right, the short spliced ​​steel bars 3 on the left and the long spliced ​​steel bars 2 on the right, the long spliced ​​steel bars 2 on the left and the long spliced ​​steel bars 2 on the right are tied at the top, and the long spliced ​​steel bars 2 on the left and the long spliced ​​steel bars 2 on the right are tied at the bottom);

[0058] Step 4: cast concrete 4 between the prefabricated bridge panels 1 to form the overall structure of the bridge panel, which can be put into use after curing as required.

[0059] In the description of the present invention, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings of the devices or components, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the devices or components referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0060] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that this is only for illustration and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A prefabricated bridge deck wet joint structure, comprising a plurality of prefabricated bridge decks, wherein adjacent prefabricated bridge decks are spaced apart to form joints, characterized in that: The prefabricated bridge decks on both sides are provided with a plurality of steel bar assemblies extending to the outside of the prefabricated bridge decks near the joints, and the plurality of steel bar assemblies are distributed transversely along the prefabricated bridge decks, wherein the steel bar assemblies each include long spliced ​​steel bars and short spliced ​​steel bars distributed along the thickness direction of the prefabricated bridge decks, the long spliced ​​steel bars on both sides are overlapped with each other to form a main ring-shaped steel bar frame, the short spliced ​​steel bars on one side and the long spliced ​​steel bars on the other side are overlapped with each other to form a secondary ring-shaped steel bar frame, the main ring-shaped steel bar frame and the secondary ring-shaped steel bar frame constitute a closed ring-shaped steel bar frame, and the prefabricated bridge decks on both sides and the main ring-shaped steel bar frame and the secondary ring-shaped steel bar frame are formed as a whole by pouring concrete; The long spliced ​​steel bars and the short spliced ​​steel bars each include two straight sections, two bent sections and an equivalent transverse reinforcement section. The two bent sections are respectively connected to the ends of the two straight sections. The equivalent transverse reinforcement section extends in the transverse direction of the prefabricated bridge deck, and the two ends of the equivalent transverse reinforcement section are respectively connected to the ends of the two bent sections.

2. The prefabricated bridge deck wet joint structure according to claim 1, characterized in that: In the steel bar assembly, at least one of the equivalent transverse reinforcement segment of the short spliced ​​steel bars and the equivalent transverse reinforcement segment of the long spliced ​​steel bars is located on the circumferential surface of the closed ring steel bar frame.

3. The prefabricated bridge deck wet joint structure according to claim 2, characterized in that: The equivalent transverse reinforcement segments in the closed ring steel reinforcement frame are evenly distributed along the circumferential direction of the circumferential surface of the closed ring steel reinforcement frame.

4. The prefabricated bridge deck wet joint structure according to claim 1, characterized in that: In two overlapping steel bar components, the long spliced ​​steel bars of one steel bar component are located above the short spliced ​​steel bars, and the long spliced ​​steel bars of the other steel bar component are located below the short spliced ​​steel bars.

5. The prefabricated bridge deck wet joint structure according to claim 4, characterized in that: The long spliced ​​steel bars on one side of the prefabricated bridge deck are all located above the short spliced ​​steel bars, and the long spliced ​​steel bars on the other side are all located below the short spliced ​​steel bars.

6. The prefabricated bridge deck wet joint structure according to claim 1, characterized in that: The bending sections are all semicircular.

7. The prefabricated bridge deck wet joint structure according to claim 6, characterized in that: The height of the bent section of the short spliced ​​steel bar along the thickness direction of the prefabricated bridge deck is 1 / 2 of the height of the bent section of the long spliced ​​steel bar along the thickness direction of the prefabricated bridge deck.

8. The prefabricated bridge deck wet joint structure according to claim 7, characterized in that: The horizontal projection of the bending section of the short spliced ​​steel bar is attached to the inner side of the horizontal projection of the bending section of the long spliced ​​steel bar.

9. The prefabricated bridge deck wet joint structure according to any one of claims 1 to 8, characterized in that: The closed ring steel bar frame is located in the middle of the wet joint along the direction along the bridge.

10. A construction method of a wet joint structure, used for the construction of a prefabricated bridge deck wet joint structure according to any one of claims 1 to 9, characterized in that: The steps include: Step 1, prefabricating a bridge deck in a factory, and pre-embedding the long spliced ​​steel bars and the short spliced ​​steel bars transversely along the prefabricated bridge deck; Step 2: transport the prefabricated bridge deck to the site and hoist it, and align and splice two adjacent prefabricated bridge decks; Step 3: Use steel bar tying wire to tie and connect the long spliced ​​steel bars and the short spliced ​​steel bars on both sides one by one; Step 4: Cast concrete between the precast bridge panels to form the overall structure of the precast bridge panels.

11. The construction method of the wet joint structure according to claim 10, characterized in that: In step 2, during hoisting, the long spliced ​​steel bars are installed first at the bottom and the short spliced ​​steel bars are installed at the top.

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