Long-span assembled continuous pile-slab structure using UHPC assembled panels and assembly construction method

Abstract

The present invention relates to the field of bridge engineering technology, and in particular to a long-span assembled continuous pile-slab structure using UHPC assembly plates and an assembly construction method. In the long-span assembled continuous pile-slab structure using UHPC assembly plates, a central precast pipe pile is located between two end precast pipe piles; a precast concrete main bridge deck is respectively erected between the two end precast pipe piles and the central precast pipe pile; a U-shaped cross steel bar is provided at the top of the central precast pipe pile, and a precast UHPC assembly plate (opposite ends of the precast concrete main bridge deck) is respectively provided with a U-shaped longitudinal connecting steel bar; the U-shaped longitudinal connecting steel bars are arranged in an alternating pattern and interspersed with transverse steel bars; the central precast pipe pile and the precast concrete main bridge deck are connected by casting the precast UHPC assembly plate to form a continuous pile-slab structure. The long-span assembled continuous pile-slab structure and construction method using UHPC assembly plates provided by the present invention improve the overall stiffness and spanning capacity of the assembled pile-slab structure, improve the undesirable aesthetic effect caused by small-span dense pile plates, and combine the advantages of convenient construction, environmental protection, and high economy of the assembled pile-slab structure.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge engineering, and in particular to a long-span assembled continuous pile-plate structure using UHPC assembly plates and an assembly construction method. Background Art

[0002] The prefabricated pile-and-slab structure is a high-strength frame system composed of prefabricated, factory-fabricated bridge decks and pipe piles, formed through a rational connection. This innovative frame system effectively transmits vertical loads while also adapting to horizontal loads such as temperature and vehicle braking forces. Its lightweight structure and affordable construction price place it between traditional bridges and roadbeds. The prefabricated pile-and-slab structure features multiple spans in a single unit, with multiple rows of prefabricated pipe piles arranged horizontally. The structure is stabilized by clusters of piers or resistance piers. This structure replaces earth-filled roadbeds with heights of 3 to 8 meters and roadbed widening, resolving the conflict between transportation construction and land conservation. It can be used in highway, urban road, and bridge construction, and is particularly well-suited for the renovation and expansion of existing expressways. Compared to traditional roadbed solutions, the prefabricated pile-and-slab structure offers advantages such as ease of construction, environmental conservation, and economic efficiency.

[0003] With the continuous development of highway construction, prefabricated pile-and-slab structures, as a new structural form, have been applied in numerous highway reconstruction and expansion projects both domestically and internationally. Their engineering applications have progressed through stages of testing, promotion, and large-scale application, with some technical trials and applications already underway. However, the most mature prefabricated pile-and-slab structures currently in use are mostly simply supported pile-and-slab structures with a span of 6m. In practical applications, these 6m spans often present limitations: When local roads are too wide, intersect with routes at an angle, or navigation restrictions are required, a 6m span often fails to meet the requirements. When the pile-and-slab structure intrudes into a river channel, its span design must also take into account hydrological conditions to minimize impacts. Furthermore, the aesthetic expectations of modern urban construction have also placed higher demands on the span and construction of pile-and-slab structures. Summary of the Invention

[0004] In order to overcome the difficulties mentioned in the above background technology, the present invention provides a large-span assembled continuous pile-slab structure and assembly construction method using UHPC assembly plates. By setting up prefabricated pipe piles in the middle, the mid-span bending moment of the structure at the same span is reduced, thereby improving the span capacity of the structure. The prefabricated pipe piles in the middle are connected vertically to the bridge deck through pre-embedded U-shaped cross steel bars and cast-in-place concrete. The precast concrete bridge deck adopts the form of a Π-shaped plate with square solid end plates at both ends, thereby replacing the traditional cap beam, realizing a direct connection between the precast bridge deck and the pipe piles, simplifying the construction process, reducing the project cost, and improving the aesthetic effect of the structure.

[0005] The structure of the precast bridge deck connection at the top of the continuous piles was optimized. Precast UHPC assembly plates were installed in the tension zone at the upper edge of the bridge deck in the negative bending moment area to improve the tensile performance of the tension zone. At the same time, the concrete connection sections were located at locations with relatively low structural stress levels. The connections between the precast concrete bridge deck, precast UHPC assembly plates, and central precast pipe piles were formed by embedding U-shaped connecting steel bars, lifting ring steel bars, and cast-in-place concrete to form concrete connection sections, effectively ensuring the reliability of the connection and the integrity of the structure.

[0006] The present invention adopts the following technical solutions:

[0007] A large-span assembled continuous pile-slab structure using UHPC assembly plates includes end precast pipe piles, middle precast pipe piles, and precast concrete bridge decks; the middle precast pipe piles are located between two end precast pipe piles; precast concrete bridge decks are respectively erected between the two end precast pipe piles and the middle precast pipe piles; the structure also includes precast UHPC assembly plates, U-shaped cross steel bars, U-shaped longitudinal connecting steel bars, and transverse steel bars; the tops of the middle precast pipe piles are provided with U-shaped cross steel bars, and the opposite ends of the precast UHPC assembly plates and the precast concrete bridge decks are respectively provided with U-shaped longitudinal connecting steel bars; the U-shaped longitudinal connecting steel bars are arranged in an alternating manner and interspersed with transverse steel bars; the middle precast pipe piles and the precast concrete bridge deck are connected by casting through the precast UHPC assembly plates to form a continuous pile-slab structure.

[0008] Precast pipe piles are used at both the simply supported and continuous ends of the structure. The precast pipe piles located at both ends of the structure are called end precast pipe piles. Simply supported bearings are installed on the vertical end faces of the pile tops, supporting the square concrete end plates of the precast concrete bridge deck. The precast pipe piles located in the middle of the structure are called middle precast pipe piles. U-shaped cross reinforcement is installed on the vertical end faces of the pile tops, connecting the piles to the bridge deck vertically through U-shaped cross reinforcement and cast-in-place concrete.

[0009] The precast concrete bridge deck adopts the form of a Π-shaped plate with square solid end plates at both ends, replacing the traditional cap beam to achieve a direct connection between the precast bridge deck and the pipe piles.

[0010] The precast concrete bridge deck consists of a Π-shaped plate, a square concrete end plate, and a square concrete end pad. The three are precast and cast as one: the main part is a Π-shaped plate; a square concrete end plate is provided at the end close to the end precast pipe pile, and its height is flush with the Π-shaped plate; a square concrete end pad is provided at the end close to the middle precast pipe pile, and its height is flush with the web of the Π-shaped plate.

[0011] The transverse end surface of the upper flange of the Π-shaped plate of the precast concrete bridge deck near the middle precast pipe pile is provided with U-shaped longitudinal connecting steel bars arranged along a transverse straight line, and the U-shaped longitudinal connecting steel bars perform the longitudinal connection function.

[0012] The transverse end surface of the square concrete end pad of the precast concrete bridge deck is provided with U-shaped longitudinal connecting steel bars arranged along a vertical straight line, and the U-shaped longitudinal connecting steel bars assume the longitudinal connection function.

[0013] The vertical end faces of the square concrete end pads of the precast concrete bridge deck are provided with lifting ring steel bars arranged in a horizontal straight line, and the lifting ring steel bars have the vertical connection function.

[0014] The vertical end surface of the prefabricated UHPC assembly plate is provided with a through vertical square hole.

[0015] U-shaped longitudinal connecting steel bars are respectively provided at the longitudinal ends of the prefabricated UHPC assembly plate, and the U-shaped longitudinal connecting steel bars are arranged in a straight line along the transverse end surface of the prefabricated UHPC assembly plate.

[0016] The precast UHPC assembly panels in the negative bending moment area are placed on the square concrete end pads of the two precast concrete bridge decks.

[0017] At the connection between the two precast concrete bridge decks, the embedded U-shaped longitudinal connecting steel bars are staggered and interspersed, and transverse steel bars are arranged in the U-shaped longitudinal connecting steel connection structure; in the middle precast pipe pile concrete connection section formed by cast-in-place concrete, the two precast concrete bridge decks are longitudinally connected by U-shaped longitudinal connecting steel bars, transverse steel bars and cast-in-place concrete, and the middle precast pipe piles are vertically connected to the bridge deck through U-shaped cross steel bars and cast-in-place concrete.

[0018] The U-shaped longitudinal connecting steel bars embedded in the precast concrete bridge deck and the U-shaped longitudinal connecting steel bars embedded in the front and rear ends of the precast UHPC assembly panels in the negative bending moment area are staggered and interlaced. Transverse steel bars are placed in the connection structure of the U-shaped longitudinal connecting steel bars. The precast concrete bridge deck is connected to the front and rear ends of the precast UHPC assembly panels in the negative bending moment area through U-shaped longitudinal connecting steel bars, transverse steel bars and cast-in-place concrete to form the precast UHPC assembly panel longitudinal connection concrete connection sections.

[0019] The pre-embedded lifting ring steel bars on the square concrete end pads of the precast concrete bridge deck extend into the vertical square holes of the precast UHPC assembly panels, and then concrete is poured into the vertical square holes to form the vertical connection concrete connection sections of the precast UHPC assembly panels.

[0020] The assembly construction method of a long-span continuous pile-slab structure using UHPC assembly panels is as follows:

[0021] S1. Determine the dimensions of the end precast pipe piles, middle precast pipe piles, precast concrete bridge deck, and precast UHPC assembly panels based on the bridge's design parameters and actual construction conditions. Also determine the materials, dimensions, and locations of ordinary steel bars, U-shaped cross bars, U-shaped longitudinal connecting bars, eye bars, and transverse bars.

[0022] S2. Prefabricate the end precast pipe piles, middle precast pipe piles, precast concrete bridge deck, and precast UHPC assembly panels according to the materials, sizes, and positions determined in step S1;

[0023] S3. Drive the end precast pipe piles and the middle precast pipe piles into the corresponding bearing layers, set corresponding simply supported supports on the vertical end faces of the tops of the end precast pipe piles, and set temporary simply supported supports at the bottom of the square concrete end pads of the precast concrete bridge deck according to the length of the precast concrete bridge deck;

[0024] S4. Install the bottom of the square concrete end plate of the precast concrete bridge deck on the simply supported support at the top of the precast pipe pile at the end;

[0025] The bottom of the square concrete end pads of the precast concrete bridge deck are supported by temporary simply supported bearings, so that the structure forms multiple simply supported systems;

[0026] The U-shaped longitudinal connecting steel bars embedded in the connection of the square concrete end pads are staggered and interlaced; the U-shaped cross steel bars at the top of the middle prefabricated pipe piles are interlaced in the staggered and interlaced U-shaped longitudinal connecting steel bars;

[0027] S5. After step S4, arranging transverse steel bars in the U-shaped longitudinal connecting steel bar connection structure embedded at the connection of the square concrete end pads, and forming a middle prefabricated pipe pile concrete connection section by pouring;

[0028] S6. Place the precast UHPC assembly plate on the square concrete end pads of the two precast concrete bridge decks; ensure that the pre-embedded eye reinforcement on the square concrete end pads extends into the vertical square holes;

[0029] S7. The U-shaped longitudinal connecting steel bars at both ends of the precast UHPC assembly panel are staggered and interlaced with the U-shaped longitudinal connecting steel bars of the Π-shaped panel. After the arrangement is completed, transverse steel bars are arranged in the connection structure, and concrete connecting sections for longitudinal connection of the precast UHPC assembly panel are cast.

[0030] S8. pouring concrete in the vertical square hole to form a vertical connection concrete connection section of the prefabricated UHPC assembly panel;

[0031] S9. After the curing of cast-in-place concrete is completed, the temporary simply supported supports are removed to form a continuous system of structures.

[0032] Beneficial effects

[0033] The large-span assembled continuous pile-plate structure and construction method using UHPC assembly plates provided by the present invention improve the overall stiffness and spanning capacity of the assembled pile-plate structure, improve the undesirable aesthetic effect caused by small-span dense pile-plates, and have the advantages of convenient construction, environmental protection, and strong economy of the assembled pile-plate structure.

[0034] The precast concrete bridge deck of the present invention adopts the form of a Π-shaped plate with square solid end plates at both ends, thereby replacing the traditional cap beam, realizing a direct connection between the precast bridge deck and the pipe piles, reducing the project cost, and improving the aesthetic effect of the structure; secondly, the present invention adopts UHPC in the local structure, significantly improving the crack resistance and spanning capacity of the structure with a lower amount of UHPC material, so that the economy is guaranteed; finally, the large-span assembled continuous pile-plate structure provided by the present invention can save the land acquisition area to a large extent, reduce the amount of roadbed widening and filling, thereby reducing the land acquisition cost and filling cost; in the renovation and expansion project, it can make full use of the existing drainage system, avoid the extension of structures such as culverts, and further save the project cost.

[0035] Strong applicability: The lower structure of the assembled pile-slab structure mainly uses prefabricated pipe piles driven into the corresponding bearing layer, which provides greater vertical stiffness and stable support, which is conducive to improving the post-construction settlement problem. It can effectively reduce the settlement difference between the widened roadbed of the expansion and reconstruction project and the original roadbed, and improve the longitudinal cracking problem. Its characteristics determine that it is suitable for various complex geological conditions and different highway grades.

[0036] Strong spanning capacity: On the one hand, the present invention reduces the mid-span bending moment of the structure at the same span compared to the simply supported prefabricated pile-plate structure by arranging prefabricated pipe piles in the middle, thereby effectively improving the spanning capacity of the structure; on the other hand, the present invention arranges prefabricated UHPC assembly plates in the tension zone of the upper edge of the bridge deck in the negative bending moment area to improve the tensile performance of the tension zone. By adopting high-strength UHPC materials, the crack resistance of the structure in the negative bending moment area is improved, and the overall stiffness and spanning capacity of the prefabricated pile-plate structure are improved, thereby expanding the application scope of the prefabricated pile-plate structure and improving the undesirable aesthetic effect caused by dense pile plates with small spans.

[0037] Good overall working performance: In the present invention, prefabricated UHPC assembly plates are set in the tension zone on the upper edge of the bridge deck in the negative bending moment area where the structural stress level is relatively high to improve the local tensile performance, and the concrete connection sections are all set at positions where the structural stress level is relatively low. The connections between the prefabricated concrete bridge deck, prefabricated UHPC assembly plates, and the central prefabricated pipe piles are formed by pre-buried U-shaped connecting steel bars, hanging ring steel bars and cast-in-place concrete to form concrete connection sections, which effectively ensure the reliability of the connection and the integrity of the structure.

[0038] Convenient construction: First, the large-span assembled continuous pile-slab structure provided by the present invention has a high degree of assembly and adopts factory-prefabricated components, which greatly shortens the time for on-site pouring and ensures the controllability of component quality; secondly, the precast concrete bridge deck of the present invention adopts the form of square solid end plates at both ends of the Π-shaped plate, which realizes the direct connection between the precast bridge deck and the pipe piles. There is no need to erect a cap beam during the construction process, and the construction process is simplified; finally, the construction process of each link of the structure is simple, which can greatly shorten the overall construction period, can greatly reduce the impact on existing traffic, ensure road operation and safety during construction, and improve the feasibility of the project.

[0039] Environmental Conservation: The large-span assembled continuous pile-and-slab structure provided by this invention is prefabricated in a factory, resulting in an environmentally friendly production process that reduces the use of raw materials such as sand, gravel, and cement, thereby lowering resource consumption. Furthermore, waste at the construction site can be effectively controlled, thereby reducing environmental pollution from on-site construction. This assembled pile-and-slab highway structure offers significant competitive advantages in terms of resource conservation and environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 Bending moment diagram of the continuous beam structure provided by the present invention;

[0041] Figure 2 A three-dimensional schematic diagram of the overall structure of the large-span assembled continuous pile-plate structure of the present invention;

[0042] Figure 3 A schematic diagram of the structural construction of the present invention;

[0043] Figure 4 (a) 3D schematic diagram of the top connection structure of the middle prefabricated pipe pile for the large-span continuous pile-slab structure invented Figure 1 (b) 3D schematic diagram of the top connection structure of the middle prefabricated pipe piles in the large-span continuous pile-slab structure Figure 2 ;

[0044] Figure 5 A top view of a bridge deck connection structure for assembling a continuous pile-slab structure for a long span according to the present invention;

[0045] Figure 6 It is a three-dimensional schematic diagram of the end prefabricated pipe piles and the middle prefabricated pipe piles in the large-span assembled continuous pile-plate structure of the present invention;

[0046] Figure 7 A three-dimensional schematic diagram of a precast concrete bridge deck in a long-span assembled continuous pile-slab structure according to the present invention;

[0047] Figure 8 A cross-sectional view of a Π-shaped plate of a precast concrete bridge deck in a long-span assembled continuous pile-plate structure of the present invention;

[0048] Figure 9 This is a cross-sectional view of a square concrete end pad of a precast concrete bridge deck in the large-span assembled continuous pile-slab structure of the present invention;

[0049] Figure 10 A three-dimensional schematic diagram of a prefabricated UHPC assembly plate in a large-span assembled continuous pile-plate structure of the present invention;

[0050] Figure 11 This is a cross-sectional view of the prefabricated UHPC assembly plate in the large-span assembled continuous pile-plate structure of the present invention.

[0051] In the figure, 1 is the end precast pipe pile, 2 is the middle precast pipe pile, 3 is the precast concrete bridge deck, 4 is the precast UHPC assembly plate, 5 is the middle precast pipe pile concrete connection section, 6 is the precast UHPC assembly plate longitudinal connection concrete connection section, 7 is the precast UHPC assembly plate vertical connection concrete connection section, 8 is the U-shaped cross steel bar, 9 is the U-shaped longitudinal connection steel bar, 10 is the eye steel bar, 11 is the transverse steel bar, 12 is the Π-shaped plate, 13 is the square concrete end plate, 14 is the square concrete end pad, and 15 is the vertical square hole. DETAILED DESCRIPTION

[0052] To make the purpose and technical solutions of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0053] like Figure 1 The figure shows the bending moment diagram of the continuous beam structure provided by an embodiment of the present invention. The mid-support and the area near both sides are the negative bending moment zone. On the bridge deck section in the negative bending moment zone, the tensile stress is mainly borne by the upper edge, and the tensile stress decreases as it approaches the lower edge.

[0054] like Figure 2 、 Figure 3 As shown, the large-span assembled continuous pile-slab structure includes end precast pipe piles 1, middle precast pipe piles 2, precast concrete bridge deck 3, precast UHPC assembly plate 4, middle precast pipe pile concrete connecting section 5, precast UHPC assembly plate longitudinal connecting concrete connecting section 6, precast UHPC assembly plate vertical connecting concrete connecting section 7, U-shaped cross steel bars 8, U-shaped longitudinal connecting steel bars 9, eye steel bars 10, and transverse steel bars 11.

[0055] like Figure 7As shown, precast tubular piles are used at both the simply supported and continuous ends of the structure. The precast tubular piles at both ends of the structure are end precast tubular piles 1. Simply supported bearings are installed on the vertical end faces of the pile tops, supporting the square concrete end plates 13 of the precast concrete bridge deck 3. The precast tubular piles located in the middle of the structure are central precast tubular piles 2. U-shaped cross bars 8 are installed on the vertical end faces of the pile tops of the central precast tubular piles 2. These U-shaped cross bars and cast-in-place concrete provide a vertical connection to the bridge deck.

[0056] like Figure 8 、 9 As shown in Figures 10 and 10, the precast concrete bridge deck 3 utilizes a Π-shaped plate with square solid end plates at each end, replacing the traditional cap beam. This allows for direct connection between the precast bridge deck and the piles, simplifying the construction process, reducing project costs, and enhancing the structural aesthetics. The precast concrete bridge deck 3 comprises a Π-shaped plate 12, square concrete end plates 13, and square concrete end pads 14, all precast and cast as one piece.

[0057] The main body is a Π-shaped plate 3; a square concrete end plate 13 is provided at the end near the end precast pipe pile 1, and its height is flush with the Π-shaped plate 12; a square concrete end pad 14 is provided at the end near the middle precast pipe pile 2, and its height is flush with the web of the Π-shaped plate 12. The transverse end surface of the upper flange of the Π-shaped plate 12 near the middle precast pipe pile of the precast concrete bridge deck 3 is provided with U-shaped longitudinal connecting steel bars 9 arranged in a straight transverse direction. These U-shaped longitudinal connecting steel bars 9 provide a longitudinal connection function. The transverse end surface of the square concrete end pad 14 of the precast concrete bridge deck 3 is provided with U-shaped longitudinal connecting steel bars 9 arranged in a straight vertical direction. These U-shaped longitudinal connecting steel bars 9 provide a longitudinal connection function. The vertical end surface of the square concrete end pad 14 of the precast concrete bridge deck 3 is provided with eye bars 10 arranged in a straight transverse direction. These eye bars 10 provide a vertical connection function.

[0058] like Figure 10 、 11 As shown, the vertical end surface of the prefabricated UHPC assembly plate 4 is provided with a through vertical square hole 15; the longitudinal ends of the prefabricated UHPC assembly plate 4 are respectively provided with U-shaped longitudinal connecting steel bars 9, and the U-shaped longitudinal connecting steel bars 9 are arranged in a straight line along the transverse end surface of the prefabricated UHPC assembly plate 4.

[0059] like Figure 2 、 3As shown in Figures 4, 5, and 6, at the connection of the precast concrete bridge deck 3, the embedded U-shaped longitudinal connecting steel bars 9 are staggered and interspersed, and transverse steel bars 11 are arranged in the connection structure of the U-shaped longitudinal connecting steel bars 9; in the middle precast pipe pile concrete connection section 5 formed by cast-in-place concrete, the two precast concrete bridge decks 3 are longitudinally connected by the U-shaped longitudinal connecting steel bars 9, transverse steel bars 11 and cast-in-place concrete, and the middle precast pipe piles 2 are vertically connected to the bridge deck by the U-shaped cross steel bars 8 and cast-in-place concrete.

[0060] like Figure 2 、 3 As shown in Figures 4a, 4b, 5, and 6, the precast UHPC assembly panel 4 is placed on the square concrete end pads 14 of the two precast concrete bridge decks 3. The precast eye reinforcement 10 embedded in the square concrete end pads 14 of the precast concrete bridge decks 3 extends into the vertical square holes 15 of the precast UHPC assembly panel 4. Concrete is then poured into the vertical square holes 10 to form the vertical concrete connection section 7 between the precast concrete bridge deck and the precast UHPC assembly panel.

[0061] like Figure 2 、 3 As shown in Figures 4a, 4b, 5, and 6, the U-shaped longitudinal connecting steel bars 9 embedded in the precast concrete bridge deck 3 and the U-shaped longitudinal connecting steel bars 9 embedded in the head and tail ends of the precast UHPC assembly plates 4 in the negative bending moment area are staggered and interlaced, and transverse steel bars 11 are placed in the connection structure of the U-shaped longitudinal connecting steel bars 9. The precast concrete bridge deck 3 is respectively connected to the head and tail ends of the precast UHPC assembly plates 4 in the negative bending moment area through the U-shaped longitudinal connecting steel bars 9, the transverse steel bars 11, and the longitudinal concrete connecting sections 6 of the UHPC assembly plates.

[0062] Assembly construction example 1:

[0063] The large-span assembled continuous pile-plate structure of the invention is assembled and constructed by the method of first simply supporting and then continuous. The construction method can be carried out according to the following steps:

[0064] 1) Based on the bridge calculation and analysis results and the actual project conditions, determine the materials and dimensions of the end precast pipe piles 1, the middle precast pipe piles 2, the precast concrete bridge deck 3, and the precast UHPC assembly plate 4. Also determine the materials, dimensions, and locations of the ordinary steel bars, U-shaped cross bars 8, U-shaped longitudinal connecting bars 9, eye bars 10, and transverse bars 11.

[0065] 2) Based on the materials, sizes, and positions of the end precast tubular piles 1, middle precast tubular piles 2, precast concrete bridge deck 3, precast UHPC assembly plate 4, ordinary steel bars, U-shaped cross steel bars 8, U-shaped longitudinal connecting steel bars 9, and eye bars 10 determined in step 1), precast end precast tubular piles 1, middle precast tubular piles 2, precast concrete bridge deck 3, and precast UHPC assembly plate 4 are precast at the beam yard.

[0066] 3) The prefabricated end prefabricated pipe piles 1, the middle prefabricated pipe piles 2, the prefabricated concrete bridge deck 3, and the prefabricated UHPC assembly panels 4 are transported to the site.

[0067] 4) According to the requirements of the specifications, drive the end precast pipe piles 1 and the middle precast pipe piles 2 into the corresponding bearing layers, set the corresponding simply supported supports on the vertical end face of the top of the end precast pipe pile 1, and determine the position of the temporary simply supported support at the other end of the bridge deck according to the length of the precast concrete bridge deck 3 (it should be located at the bottom of the square concrete end pad 14 of the precast concrete bridge deck 3), and set the temporary simply supported support.

[0068] 5) Erect the precast concrete bridge decks 3 as required. The bottoms of the square concrete end plates 13 of the precast concrete bridge decks 3 are supported by simply supported supports at the tops of the precast tubular piles 1 at the ends. The bottoms of the square concrete end pads 14 of the precast concrete bridge decks 3 are supported by temporary simply supported supports, forming multiple simply supported systems. At the junction of the two precast concrete bridge decks 3, pre-embedded U-shaped longitudinal connecting steel bars 9 are staggered and interspersed.

[0069] 6) As required, transverse reinforcement 11 is placed within the pre-staggered, interlaced U-shaped longitudinal connecting reinforcement 9 between the top of the central precast pipe pile and the two precast concrete deck panels (3). The precast concrete deck-central precast pipe pile concrete connection section 5 is then cast. The cast-in-place concrete should strictly adhere to the mix ratio, carefully controlling slump, air content, water-cement ratio, and admixtures. To avoid shrinkage cracks in the concrete connection section and reduce thermal stress within the beam at this location, the concrete should be poured at the lowest temperature of the day. Vibration should be performed using an inserted vibrator, strictly avoiding missed or excessive vibrations. Vibration should cease when the concrete surface stops sinking, begins to return to the slurry, and no large bubbles are seen.

[0070] 7) As required, the negative moment zone precast UHPC assembly plate 4 is placed on the square concrete end pads 14 of the two precast concrete bridge decks 3. The pre-embedded eye reinforcement 10 on the square concrete end pads 14 of the precast concrete bridge decks 3 is extended into the vertical square holes 10 of the precast UHPC assembly plate 4.

[0071] 8) Transverse reinforcement 11 is placed within the staggered, interlaced U-shaped longitudinal connecting reinforcement 9 connecting the precast concrete deck 3 and the precast UHPC assembly panels 4 in the negative moment zone. Ordinary concrete is poured at this connection to form the precast concrete deck-precast UHPC assembly panel longitudinal connection concrete segment 6. Cast-in-place concrete should be carefully prepared according to the mix ratio, carefully controlling slump, air content, water-cement ratio, and admixtures. To avoid shrinkage cracks in the concrete connection segment and reduce thermal stress within the beam at this location, pour the concrete at the lowest temperature of the day. Use an inserted vibrator for vibrating, strictly avoiding missed or excessive vibrations. Vibration should cease when the concrete surface stops sinking, begins to return to the slurry, and no large bubbles are visible.

[0072] 9) Pour concrete into the vertical square holes 10 to form the vertical connection 7 between the precast concrete bridge deck and the precast UHPC assembly panel. Cast-in-place concrete should strictly adhere to the mix ratio, carefully controlling slump, air content, water-cement ratio, and admixtures. To avoid shrinkage cracks in the concrete connection and reduce thermal stress within the beam at this location, pour the concrete at the lowest temperature of the day. Use an insert vibrator for vibrating, strictly avoiding missed or over-vibration. Stop vibrating when the concrete surface stops sinking, begins to return to the slurry, and no large bubbles are released.

[0073] 10) After the cast-in-place concrete is cured, remove the temporary supports to form a continuous system.

[0074] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A long-span assembled continuous pile-slab structure using UHPC assembly plates, comprising end prefabricated pipe piles (1), middle prefabricated pipe piles (2), and prefabricated concrete bridge decks (3); the middle prefabricated pipe piles (2) are located between two end prefabricated pipe piles (1); and prefabricated concrete bridge decks (3) are respectively erected between the two end prefabricated pipe piles (1) and the middle prefabricated pipe piles (2); the characteristics are: It also includes a prefabricated UHPC assembly plate (4), U-shaped cross steel bars (8), U-shaped longitudinal connecting steel bars (9), and transverse steel bars (11); the top of the middle prefabricated pipe pile (2) is provided with a U-shaped cross steel bar (8), and the opposite ends of the prefabricated UHPC assembly plate (4) and the prefabricated concrete bridge deck (3) are respectively provided with U-shaped longitudinal connecting steel bars (9); the U-shaped longitudinal connecting steel bars (9) are arranged in a staggered manner and interspersed with transverse steel bars (11); the prefabricated pipe pile (2) and the prefabricated concrete bridge deck (3) in the middle are cast and connected through the prefabricated UHPC assembly plate (4) to form a continuous pile-plate structure; The precast concrete bridge deck (3) comprises a Π-shaped plate (12), a square concrete end plate (13), and a square concrete end pad (14); the Π-shaped plate (12), the square concrete end plate (13), and the square concrete end pad (14) are cast into an integrated structure; A square concrete end plate (13) is provided at one end of the Π-shaped plate (12), and the upper plane of the square concrete end plate (13) is flush with the top plane of the Π-shaped plate (12); The other end of the Π-shaped plate (12) is provided with a square concrete end pad (14), and the upper plane of the square concrete end pad (14) is flush with the web of the Π-shaped plate (12); The Π-shaped plate (12) is located at one end of the square concrete end pad (14), and is provided with U-shaped longitudinal connecting steel bars (9) arranged in a straight line along the end surface; the U-shaped longitudinal connecting steel bars (9) are located above the square concrete end pad (14); The U-shaped longitudinal connecting steel bars (9) between the square concrete end pads (14) and the U-shaped cross steel bars (8) of the middle prefabricated pipe piles (2) are cast to form a middle prefabricated pipe pile concrete connecting section (5), thereby achieving a longitudinal connection with the bridge deck.

2. The large-span assembled continuous pile-plate structure using UHPC assembly plates according to claim 1, characterized in that: The transverse end surface of the square concrete end pad (14) facing outward is provided with U-shaped longitudinal connecting steel bars (9) arranged in a straight line; the U-shaped longitudinal connecting steel bars (9) realize the longitudinal connection function.

3. The large-span assembled continuous pile-plate structure using UHPC assembly plates according to claim 1, characterized in that: A prefabricated UHPC assembly plate (4) is placed on a square concrete end pad (14) of a prefabricated concrete bridge deck (3); the U-shaped longitudinal connecting steel bars (9) of the prefabricated UHPC assembly plate (4) and the U-shaped longitudinal connecting steel bars (9) of the Π-shaped plate (12) are arranged in a staggered and interlaced manner, and transverse steel bars (11) are provided between the mutually arranged U-shaped longitudinal connecting steel bars (9); and a prefabricated UHPC assembly plate longitudinal connecting concrete connecting section (6) is formed by pouring.

4. The large-span assembled continuous pile-plate structure using UHPC assembly plates according to claim 3, characterized in that: A lifting ring steel bar (10) is provided on the upper surface of the square concrete end pad (14); a vertical square hole (15) for the lifting ring steel bar (10) to pass through is provided on the prefabricated UHPC assembly plate (4), and the lifting ring steel bar (10) performs a vertical connection function.

5. The assembly construction method of a large-span continuous pile-plate structure using UHPC assembly plates according to claim 4, characterized in that: Here are the steps: S1. Based on the design parameters of the bridge and the actual construction conditions, determine the sizes of the end precast pipe piles (1), the middle precast pipe piles (2), the precast concrete bridge deck (3), and the precast UHPC assembly plate (4), and determine the materials, sizes, and positions of the ordinary steel bars, U-shaped cross steel bars (8), U-shaped longitudinal connecting steel bars (9), eye bars (10), and transverse steel bars (11); S2. Prefabrication of the end prefabricated pipe piles (1), the middle prefabricated pipe piles (2), the prefabricated concrete bridge deck (3), and the prefabricated UHPC assembly panels (4) is performed according to the materials, sizes, and positions determined in step S1; S3, driving the end prefabricated pipe piles (1) and the middle prefabricated pipe piles (2) into the corresponding bearing layers, setting corresponding simply supported supports on the vertical end faces of the pile tops of the end prefabricated pipe piles (1), and setting temporary simply supported supports at the bottom of the square concrete end pads (14) of the prefabricated concrete bridge deck (3) according to the length of the prefabricated concrete bridge deck (3); S4, placing the bottom of the square concrete end plate (13) of the precast concrete bridge deck (3) on the simply supported support at the top of the precast pipe pile (1) at the end; The bottom of the square concrete end pad (14) of the precast concrete bridge deck (3) is supported by a temporary simply supported support, so that the structure forms a plurality of simply supported systems; The U-shaped longitudinal connecting steel bars (9) embedded at the connection of the square concrete end pads (14) are arranged in a staggered and interlaced manner; the U-shaped cross steel bars (8) at the top of the middle prefabricated pipe piles (2) are interlaced in the U-shaped longitudinal connecting steel bars (9) arranged in a staggered and interlaced manner; S5. After step S4, arranging transverse steel bars (11) in the connection structure of the U-shaped longitudinal connecting steel bars (9) pre-buried at the connection of the square concrete end pad (14), and forming the middle prefabricated pipe pile concrete connection section (5) by pouring; S6. Place the prefabricated UHPC assembly plate (4) on the square concrete end pads (14) of the two prefabricated concrete bridge decks (3); ensure that the pre-embedded eye reinforcement (10) on the square concrete end pads (14) extend into the vertical square holes (15); S7, the U-shaped longitudinal connecting steel bars (9) at both ends of the prefabricated UHPC assembly plate (4) and the U-shaped longitudinal connecting steel bars (9) of the Π-shaped plate (12) are staggered and interlaced. After the arrangement is completed Arranging transverse reinforcement (11) in the connection structure and pouring a prefabricated UHPC assembly plate longitudinal connection concrete connection section (6); S8, pouring concrete in the vertical square hole (15) to form a prefabricated UHPC assembly plate vertical connection concrete connection section (7); S9. After the curing of cast-in-place concrete is completed, the temporary simply supported supports are removed to form a continuous system of structures.

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