Large-span assembled continuous pile plate structure adopting UHPC (Ultra High Performance Concrete) assembly plates and assembly construction method

Abstract

The invention relates to the technical field of bridge engineering, in particular to a large-span assembly continuous pile plate structure adopting UHPC assembly plates and an assembly construction method. A large-span assembly continuous pile-plate structure of a UHPC assembly plate is adopted, and the middle prefabricated pipe pile is located between the two end prefabricated pipe piles; precast concrete main body bridge deck slabs are respectively erected between the two end precast pipe piles and the middle precast pipe piles; u-shaped crossed steel bars are arranged at the tops of the middle prefabricated pipe piles, and U-shaped longitudinal connecting steel bars are arranged at the ends, opposite to the prefabricated concrete main bridge deck slab, of the prefabricated UHPC assembly plates correspondingly; the U-shaped longitudinal connecting steel bars are arranged in a staggered manner and are inserted with transverse steel bars; the prefabricated pipe piles located in the middle and the prefabricated concrete body bridge deck slab are connected in a pouring mode through the prefabricated UHPC assembly plates to form a continuous pile-slab structure. According to the large-span assembly continuous pile plate structure adopting the UHPC assembly plates and the construction method, the overall rigidity and the spanning capacity of the assembly pile plate structure are improved, the bad aesthetic effect caused by small-span dense pile plates is improved, and the large-span assembly continuous pile plate structure has the advantages of being convenient to construct, environmentally friendly, economical and high in economical efficiency of the assembly pile plate 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 a UHPC assembly plate and an assembly construction method. Background Art

[0002] The assembled pile-slab structure is a high-strength frame structure system. It is a new frame structure system formed by reasonable connection of factory-prefabricated bridge decks and pipe piles. It can not only transmit vertical loads well, but also adapt to horizontal loads such as temperature and automobile braking force. It has a light structure and moderate cost. It is a new structure between traditional bridges and roadbeds. The assembled pile-slab structure has multiple spans and one connection. Multiple rows of prefabricated pipe piles are set horizontally. The whole is limited by group piers or resistance piers. In this way, it replaces the fill roadbed with a fill height of 3 to 8m and the roadbed width splicing, solving the contradiction between transportation construction and land resource protection. It can be used in the construction of highways, urban roads, bridges and other fields, especially suitable for the reconstruction and expansion of existing highways. Compared with the traditional roadbed solution, the assembled pile-slab structure has the advantages of convenient construction, environmental protection, and strong economy.

[0003] At present, with the continuous development of highway construction, the assembled pile-slab structure, as a new type of structure, has been applied in many highway reconstruction and expansion projects at home and abroad. Its engineering application has gone through the stages of trial, promotion, and large-scale application, and some technical attempts and applications have been made. However, the currently more mature assembled pile-slab structures for highways are mostly 6m span simply supported pile-slab structures. In practical applications, the 6m span pile-slab structure has many limitations: when the local road is too wide, obliquely intersects with the route, or navigation restrictions need to be considered, the 6m span often cannot meet the requirements; when the pile-slab structure invades the river channel, its span design must also take into account the hydrological conditions to reduce the impact of the river channel. In addition, the expectation of aesthetics in modern urban construction also puts higher requirements on the span and structure of the pile-slab structure. 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 an assembly construction method using UHPC assembly plates. By setting the middle prefabricated pipe piles, the mid-span bending moment of the structure at the same span is reduced, and the spanning capacity of the structure is improved. The middle prefabricated pipe piles are vertically connected to the bridge deck by pre-embedded U-shaped cross steel bars and cast-in-place concrete. The precast concrete bridge deck adopts the form of square solid end plates at both ends of the Π-shaped plate to replace the traditional cap beam, realize the direct connection between the precast bridge deck and the pipe piles, simplify the construction process, reduce the project cost, and improve the structural aesthetic effect.

[0005] The structure of the precast bridge deck connection at the top of the continuous piles is optimized. The tensile performance of the tensile zone is improved by setting precast UHPC assembly plates in the tensile zone at the upper edge of the bridge deck in the negative bending moment zone. At the same time, the concrete connection sections are all located at positions with relatively low structural stress levels. The connections between the precast concrete bridge deck, precast UHPC assembly plates, and the middle precast pipe piles are formed by using pre-buried U-shaped connecting steel bars, eye 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.

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

[0007] A large-span assembled continuous pile-slab structure using UHPC assembly plates, comprising end precast pipe piles, middle precast pipe piles, and precast concrete main bridge deck; the middle precast pipe piles are located between two end precast pipe piles; precast concrete main 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 top of the middle precast pipe piles is provided with U-shaped cross steel bars, and the opposite ends of the precast UHPC assembly plates and the precast concrete main bridge deck are respectively provided with U-shaped longitudinal connecting steel bars; the U-shaped longitudinal connecting steel bars are arranged in a staggered manner and are interspersed with transverse steel bars; the middle precast pipe piles and the precast concrete main 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 the simply supported ends and continuous ends of the structure. The precast pipe piles at both ends of the overall structure are end precast pipe piles, and the vertical end faces of the top of the end precast pipe piles are provided with simply supported bearings, which are used to support the square concrete end plates of the precast concrete bridge deck; the precast pipe piles in the middle of the overall structure are middle precast pipe piles, and the vertical end faces of the top of the middle precast pipe piles are provided with U-shaped cross steel bars, which are used to realize the vertical connection between the middle precast pipe piles and the bridge deck through U-shaped cross steel bars 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, thereby replacing the traditional cap beam and realizing the 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, which 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 that of 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 that of the web of the Π-shaped plate.

[0011] The transverse end face 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 have a 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 surface of the square concrete end pad of the precast concrete bridge deck is provided with lifting eye reinforcements arranged in a horizontal straight line, and the lifting eye reinforcements have a 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 arranged at the head and tail ends of the prefabricated UHPC assembly plate in the longitudinal direction, 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 interlaced, 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 by 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 plate in the negative bending moment area are staggered and interlaced, and transverse steel bars are placed in the connection structure of the U-shaped longitudinal connecting steel bars. The precast concrete bridge deck is respectively connected to the front and rear ends of the precast UHPC assembly plate in the negative bending moment area through U-shaped longitudinal connecting steel bars, transverse steel bars and cast-in-place concrete to form a precast UHPC assembly plate longitudinal connection concrete connection section.

[0019] The pre-embedded lifting eye reinforcement on the square concrete end pad of the precast concrete bridge deck extends into the vertical square hole of the precast UHPC assembly plate, and then concrete is poured in the vertical square hole to form a vertical connection concrete connection section of the precast UHPC assembly plate.

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

[0021] S1. According to the design parameters and actual construction conditions of the bridge, determine the sizes of the end precast pipe piles, the middle precast pipe piles, the precast concrete main bridge deck, and the precast UHPC assembly plate, and determine the materials, sizes, and positions of ordinary steel bars, U-shaped cross steel bars, U-shaped longitudinal connecting steel bars, eye steel bars, and transverse steel bars;

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

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

[0024] S4, erecting 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 at the connection of the square concrete end pad are arranged in a staggered and interlaced manner; the U-shaped cross steel bars at the top of the middle prefabricated pipe pile are interlaced in the U-shaped longitudinal connecting steel bars arranged in a staggered and interlaced manner;

[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 pad, and forming a middle prefabricated pipe pile concrete connection section by pouring;

[0028] S6. Place the prefabricated UHPC assembly plate on the square concrete end pads of the two prefabricated concrete bridge decks (on top; ensure that the pre-buried lifting ring steel bars on the square concrete end pads extend into the vertical square holes;

[0029] S7. The U-shaped longitudinal connecting steel bars at both ends of the prefabricated UHPC assembly plate and the U-shaped longitudinal connecting steel bars of the Π-shaped plate are arranged in an interlaced manner.

[0030] Transverse reinforcement is arranged in the connection structure, and a prefabricated UHPC assembly panel longitudinal connection concrete connection section is cast;

[0031] S8, pouring concrete in the vertical square hole to form a vertical connection concrete connection section of the prefabricated UHPC assembly plate;

[0032] S9. After the curing of cast-in-place concrete is completed, the temporary simply supported supports are removed to make the structure a continuous system.

[0033] Beneficial Effects

[0034] 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.

[0035] 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, thereby replacing the traditional cap beam, realizing the 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, and significantly improves 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-slab 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.

[0036] 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.

[0037] Strong spanning capacity: On the one hand, the present invention reduces the mid-span bending moment of the structure at the same span compared with the simply supported assembled 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 on the upper edge of the bridge deck in the negative bending moment area to improve the tensile performance of the tension zone, and improves the crack resistance of the structure in the negative bending moment area by adopting high-strength UHPC materials, thereby improving the overall stiffness and spanning capacity of the assembled pile-plate structure, thereby expanding the application scope of the assembled pile-plate structure and improving the undesirable aesthetic effect brought by small-span dense pile plates.

[0038] Good overall working performance: In the present invention, a prefabricated UHPC assembly plate is arranged 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 arranged at positions where the structural stress level is relatively low. The connection between the prefabricated concrete bridge deck, the prefabricated UHPC assembly plate, and the middle prefabricated pipe piles adopts pre-buried U-shaped connecting steel bars, eye steel bars and cast-in-place concrete to form a concrete connection section, which effectively ensures the reliability of the connection and the integrity of the structure.

[0039] 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 to achieve 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.

[0040] Environmental protection and conservation: The large-span assembled continuous pile-slab structure provided by the present invention is produced in advance through factory prefabrication. The factory production process is more environmentally friendly, reducing the use of raw materials such as sand, gravel, and cement, and reducing resource consumption. At the same time, waste on the construction site can also be effectively controlled, thereby reducing environmental pollution from on-site construction. The assembled pile-slab structure of the highway has a greater competitive advantage in saving resources and protecting the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 The bending moment diagram of the continuous beam structure provided by the present invention;

[0042] Figure 2 A three-dimensional schematic diagram of the overall structure of the large-span assembled continuous pile-plate structure of the present invention;

[0043] Figure 3 A schematic diagram of the structural construction of the present invention;

[0044] Figure 4 (a) A three-dimensional schematic diagram of the top connection structure of the middle prefabricated pipe pile for the large-span continuous pile-slab structure of the invention Figure 1 (b) is a three-dimensional schematic diagram of the top connection structure of the middle prefabricated pipe pile of the large-span continuous pile-slab structure Figure 2 ;

[0045] Figure 5 A top view of a bridge deck connection structure of a large-span continuous pile-slab structure according to the present invention;

[0046] 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-slab structure of the present invention;

[0047] Figure 7 A three-dimensional schematic diagram of a precast concrete bridge deck in a large-span assembled continuous pile-slab structure of the present invention;

[0048] Figure 8 A cross-sectional view of a Π-shaped plate of a precast concrete bridge deck in a large-span continuous pile-plate structure of the present invention;

[0049] Fig. 9 It 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;

[0050] Fig.10 A three-dimensional schematic diagram of a prefabricated UHPC assembly plate in a large-span assembly continuous pile-plate structure of the present invention;

[0051] Fig.11 This is a cross-sectional view of a prefabricated UHPC assembly plate in the large-span assembled continuous pile-plate structure of the present invention.

[0052] 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 U-shaped cross steel bar, 9 is U-shaped longitudinal connection steel bar, 10 is eye steel bar, 11 is transverse steel bar, 12 is Π-shaped plate, 13 is square concrete end plate, 14 is square concrete end pad, and 15 is vertical square hole. DETAILED DESCRIPTION

[0053] In order to make the purpose and technical solution of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment 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.

[0054] like Figure 1 As shown in FIG. 1 , the moment diagram of the continuous beam structure provided by the embodiment of the present invention is shown, and the middle support point and the areas near both sides are negative moment areas. On the bridge deck section in the negative moment area, the tensile stress is mainly borne by the upper edge, and the closer to the lower edge, the smaller the tensile stress.

[0055] 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 decks 3, precast UHPC assembly panels 4, middle precast pipe pile concrete connecting sections 5, precast UHPC assembly panel longitudinal connecting concrete connecting sections 6, precast UHPC assembly panel vertical connecting concrete connecting sections 7, U-shaped cross steel bars 8, U-shaped longitudinal connecting steel bars 9, eye steel bars 10, and transverse steel bars 11.

[0056] like Figure 7As shown, the precast pipe piles are respectively applied to the simply supported end and the continuous end of the structure. The precast pipe piles arranged at both ends of the overall structure are the end precast pipe piles 1, and the vertical end surface of the pile top of the end precast pipe pile 1 is provided with a simply supported support, and the precast pipe piles support the square concrete end plate 13 of the precast concrete bridge deck 3 through the simply supported support; the precast pipe piles arranged in the middle of the overall structure are the middle precast pipe piles 2, and the vertical end surface of the pile top of the middle precast pipe pile 2 is provided with a U-shaped cross steel bar 8, and the middle precast pipe pile 2 is vertically connected to the bridge deck through the U-shaped cross steel bar 8 and cast-in-place concrete.

[0057] like Figure 8 , 9 As shown in FIG. 10 , the precast concrete bridge deck 3 adopts the form of a square solid end plate at both ends of a Π-shaped plate, thereby replacing the traditional cap beam, realizing the direct connection between the precast bridge deck and the pipe pile, simplifying the construction process, reducing the project cost, and improving the structural aesthetic effect. The precast concrete bridge deck 3 is composed of a Π-shaped plate 12, a square concrete end plate 13, and a square concrete end pad 14, which are precast and cast as one;

[0058] The main part is a Π-shaped plate 3; a square concrete end plate 13 is provided at one end near the end precast pipe pile 1, and its height is flush with that of the Π-shaped plate 12; a square concrete end pad 14 is provided at one end near the middle precast pipe pile 2, and its height is flush with that of the web of the Π-shaped plate 12. The transverse end face 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 transverse straight line, and the U-shaped longitudinal connecting steel bars 9 have a longitudinal connection function. The transverse end face 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 vertical straight line, and the U-shaped longitudinal connecting steel bars 9 have a longitudinal connection function; the vertical end face of the square concrete end pad 14 of the precast concrete bridge deck 3 is provided with eye reinforcement bars 10 arranged in a transverse straight line, and the eye reinforcement bars 10 have a vertical connection function.

[0059] like Fig.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.

[0060] 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 arranged in a staggered and interlaced manner, and the 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, the transverse steel bars 11 and the 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 the cast-in-place concrete.

[0061] like Figure 2 , 3 As shown in , 4a, 4b, 5, and 6, the precast UHPC assembly plate 4 is placed on the square concrete end pads 14 of the two precast concrete bridge decks 3. The pre-buried eye reinforcement 10 on the square concrete end pads 14 of the precast concrete bridge deck 3 extends into the vertical square hole 15 of the precast UHPC assembly plate 4, and then the concrete in the vertical square hole 10 is poured to form the precast concrete bridge deck-precast UHPC assembly plate vertical connection concrete connection section 7.

[0062] like Figure 2 , 3 As shown in , 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 plate 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 plate 4 in the negative bending moment area through the U-shaped longitudinal connecting steel bars 9, the transverse steel bars 11 and the UHPC assembly plate longitudinally connected concrete connecting section 6.

[0063] Assembly construction example 1:

[0064] The large-span assembled continuous pile-plate structure of the present invention is assembled and constructed by a simple support-first-continuous-second method, and the construction method can be carried out according to the following steps:

[0065] 1) According to the calculation and analysis results of the bridge and the actual situation of the project, the materials and 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 are determined, and 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 are determined.

[0066] 2) Based on the materials, sizes and positions of the end precast pipe piles 1, the middle precast pipe piles 2, the precast concrete bridge deck 3, the precast UHPC assembly plate 4, the ordinary steel bars, the U-shaped cross steel bars 8, the U-shaped longitudinal connecting steel bars 9 and the eye steel bars 10 determined in step 1), 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 are precast in the beam yard.

[0067] 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.

[0068] 4) According to the requirements of the specifications, the end precast pipe piles 1 and the middle precast pipe piles 2 are driven into the corresponding bearing layers, and the corresponding simply supported supports are set on the vertical end face of the top of the end precast pipe piles 1. According to the length of the precast concrete bridge deck 3, the position of the temporary simply supported support at the other end of the bridge deck is determined (it should be set at the bottom of the square concrete end pad 14 of the precast concrete bridge deck 3), and the temporary simply supported support is set.

[0069] 5) Precast concrete bridge decks 3 are erected as required, the bottom of the square concrete end plates 13 of the precast concrete bridge decks 3 is supported by the simple support at the top of the precast pipe piles 1 at the end, and the bottom of the square concrete end pads 14 of the precast concrete bridge decks 3 is supported by temporary simple support, so that the structure forms multiple simple support systems. At the connection of the two precast concrete bridge decks 3, the embedded U-shaped longitudinal connecting steel bars 9 are staggered and interlaced.

[0070] 6) According to the requirements, transverse steel bars 11 are arranged in the connection structure of the embedded U-shaped longitudinal connecting steel bars 9 arranged staggered and interlaced between the top of the middle precast pipe pile concrete pile and the two precast concrete bridge decks 3, and the precast concrete bridge deck-middle precast pipe pile concrete connection section 5 is cast. The cast-in-place concrete should be made strictly according to the mix ratio, and the slump, air content, water-cement ratio, admixture and other indicators should be controlled. In order to avoid shrinkage cracks in the concrete connection section and reduce the temperature stress in the beam body at the concrete connection section, the lowest temperature of the day is selected for concrete pouring, and an inserted vibrator is used for vibration. Missing vibration and over-vibration are strictly prohibited. When the concrete surface stops sinking and starts to return to slurry, and no large bubbles overflow, the vibration can be stopped.

[0071] 7) As required, the negative moment zone prefabricated UHPC assembly plate 4 is placed on the square concrete end pads 14 of the two prefabricated concrete bridge decks 3, and the pre-embedded lifting eye steel bars 10 on the square concrete end pads 14 of the prefabricated concrete bridge decks 3 extend into the vertical square holes 10 of the prefabricated UHPC assembly plate 4.

[0072] 8) Transverse reinforcement 11 is arranged in the connection structure of the embedded U-shaped longitudinal connection reinforcement 9 arranged at both ends of the precast concrete bridge deck 3 and the precast UHPC assembly plate 4 in the negative bending moment area, and ordinary concrete is poured at the connection structure to form the precast concrete bridge deck-precast UHPC assembly plate longitudinal connection concrete connection section 6. The cast-in-place concrete should be made strictly according to the mix ratio, and the slump, air content, water-cement ratio, admixture and other indicators should be controlled. In order to avoid shrinkage cracks in the concrete connection section and reduce the temperature stress in the beam body at the concrete connection section, the lowest temperature of the day is selected for concrete pouring, and an inserted vibrator is used for vibration. Missing vibration and over-vibration are strictly prohibited. When the concrete surface stops sinking and starts to return to slurry, and no large bubbles overflow, the vibration can be stopped.

[0073] 9) Pour concrete in the vertical square hole 10 to form the precast concrete bridge deck-precast UHPC assembly plate vertical connection concrete connection section 7. The cast-in-place concrete should be made strictly according to the mix ratio, and the slump, air content, water-cement ratio, admixture and other indicators should be controlled. In order to avoid shrinkage cracks in the concrete connection section and reduce the temperature stress in the beam body at the concrete connection section, the lowest temperature of the day should be selected for concrete pouring, and an inserted vibrator should be used for vibration. Missing vibration and over-vibration are strictly prohibited. When the concrete surface stops sinking and starts to return to slurry, and no large bubbles overflow, the vibration can be stopped.

[0074] 10) After the cast-in-place concrete is cured, remove the temporary supports to form a continuous system.

[0075] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A long-span assembled continuous pile-slab structure using UHPC assembly plates, comprising end precast pipe piles (1), middle precast pipe piles (2), and precast concrete main bridge deck (3); the middle precast pipe piles (2) are located between two end precast pipe piles (1); precast concrete main bridge decks (3) are respectively set between the two end precast pipe piles (1) and the middle precast 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 main 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 are interspersed with transverse steel bars (11); the prefabricated pipe pile (2) in the middle and the prefabricated concrete main bridge deck (3) are cast and connected through the prefabricated UHPC assembly plate (4) to form a continuous pile-plate structure.

2. The large-span assembled continuous pile-plate structure using UHPC assembly plates according to claim 1, characterized in that: The precast concrete main 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); A square concrete end pad (14) is provided at the other end of the Π-shaped plate (12), and the upper plane of the square concrete end pad (14) is flush with the web of the Π-shaped plate (12).

3. The large-span assembled continuous pile-plate structure using UHPC assembly plates according to claim 2, characterized in that: The Π-shaped plate (12) is provided with a U-shaped longitudinal connecting steel bar (9) arranged in a straight line along the end surface at one end of the square concrete end pad (14); the U-shaped longitudinal connecting steel bar (9) is located above the square concrete end pad (14).

4. The large-span assembled continuous pile-plate structure using UHPC assembly plates according to claim 2, 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.

5. The large-span assembled continuous pile-plate structure using UHPC assembly plates according to claim 2 or 3, characterized in that: A prefabricated UHPC assembly plate (4) is placed on a square concrete end pad (14) of a prefabricated concrete main 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 an offset 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 connection section (6) is formed by casting.

6. The large-span assembled continuous pile-plate structure using UHPC assembly plates according to claim 5, 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.

7. The large-span assembled continuous pile-plate structure using UHPC assembly plates according to claim 1 or 3, characterized in that: 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) to achieve longitudinal connection with the bridge deck.

8. The assembly construction method of a long-span assembly continuous pile-plate structure using a UHPC assembly plate according to any one of claims 1 to 7, characterized in that: Here are the steps: S1. According to the design parameters of the bridge and the actual construction conditions, the sizes of the end precast pipe piles (1), the middle precast pipe piles (2), the precast concrete main bridge deck (3), and the precast UHPC assembly plate (4) are determined, and 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) are determined; S2, according to the materials, sizes and positions determined in step S1, prefabrication of end prefabricated pipe piles (1), middle prefabricated pipe piles (2), prefabricated concrete main bridge deck (3), and prefabricated UHPC assembly panels (4) is performed; S3, driving the end prefabricated pipe piles (1) and the middle prefabricated pipe piles (2) into the corresponding bearing layers, setting corresponding simply supported bearings on the vertical end faces of the tops of the end prefabricated pipe piles (1), and setting temporary simply supported bearings at the bottom of the square concrete end pads (14) of the prefabricated concrete main bridge deck (3) according to the length of the prefabricated concrete bridge deck (3); S4, erecting 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) pre-buried at the connection of the square concrete end pad (14) are arranged in a staggered and interlaced manner; the U-shaped cross steel bars (8) at the top of the middle prefabricated pipe pile (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-buried lifting 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 arranged in an interlaced manner. Arranging transverse steel bars (11) in the connection structure, and casting to form 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 make the structure a continuous system.

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