Spring prestressed tendon elastic concrete energy dissipation connecting joint suitable for pile-slab structure and construction method of spring prestressed tendon elastic concrete energy dissipation connecting joint

Abstract

The invention discloses a spring prestressed tendon elastic concrete energy dissipation connection node suitable for a pile-slab structure and a construction method thereof, and the spring prestressed tendon elastic concrete energy dissipation connection node comprises a prefabricated pavement slab, a connection pier column, a prefabricated pipe pile, a lock catch type mechanical connection device, an upper anchor plate, a lower anchor plate, a prestressed reinforcement externally sleeved with an energy dissipation spring, and elastic concrete poured in a through hole channel, the connecting pier column is arranged between the lower prefabricated pipe pile and the upper prefabricated pavement slab and connected with the prefabricated pipe pile through the lock catch type mechanical connecting device, a vertically-through hole channel is formed among the upper pavement slab, the connecting pier column and the lower prefabricated pipe pile, and elastic concrete is poured into the hole channel. Prestressed steel bars penetrate through the hole channels filled with the elastic concrete and connect the prefabricated pavement slabs with the connecting pier columns through the upper anchor plates and the lower anchor plates. The connecting node can effectively reduce the rigidity of the connecting node, solves the problem of stress concentration of the pile plate node caused by vibration of the pavement slab during operation, is mainly used for dissipating energy, is quick to assemble, saves materials, and greatly improves the construction efficiency of a pile plate type roadbed structure.

Description

Technical Field

[0001] The invention relates to the technical field of road and bridge construction, and in particular to a spring prestressed tendon elastic concrete energy dissipation connection node suitable for a pile-sheet overhead soilless roadbed structure with high seismic intensity in plain areas. Background Art

[0002] With the rapid economic development and continuous social progress in my country, low-carbon, environmentally friendly and high-quality sustainable construction concepts have become the basic guiding ideology in the field of transportation construction. However, the current situation of no land to occupy and no soil to use is getting worse. In order to improve the durability, environmental protection and landscape of highways, a new type of land-saving pile-slab overhead roadbed structure has been developed and applied in the practice of highway widening and new construction projects. It is mainly composed of integrated piles, prefabricated ribbed panels and pile-slab connection parts. Compared with traditional fill roadbed, this structure has high overall stiffness, good smoothness, and small post-construction settlement. There is no roadbed soil filling and slope, which effectively alleviates the problem of land acquisition difficulties.

[0003] In the new type of land-saving pile-slab overhead roadbed structure, the connection nodes between the prefabricated pipe piles and the upper pile-slab often play a decisive role in the structural integrity, vibration durability, and structural stiffness. At present, it is more common to use traditional steel cage wet connection or I-beam cast-in-place concrete node connection between prefabricated pipe piles and pile-slabs. However, the highway pile-slab structure has a long mileage. It is very costly to use steel concrete to connect the bridge deck and pipe piles, which is less economical and has a low degree of intensiveness. It will also lead to a larger stiffness of the connection node, which is not conducive to energy consumption in earthquake resistance and is prone to brittle fracture. The present invention provides a spring prestressed tendon elastic concrete energy-absorbing connection node and construction method suitable for a pile-slab structure. In view of the large difference between the pile diameter of the lower pipe pile and the pipe diameter of the upper panel, a connecting pier is used to replace the steel frame in the traditional method, and a locking connection device is used to replace the traditional steel cage, thereby eliminating the disadvantages of the traditional cast-in-place concrete connection structure with many temporary facilities and heavy on-site workload. The installation and disassembly of the components are relatively convenient, which greatly improves the construction efficiency of the pile-slab assembly, is beneficial to daily use, maintenance and inspection, and the elastic concrete used can effectively solve the problem of node stress concentration, thereby providing a new method for the reliable connection between the prefabricated pipe pile and the upper road panel. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a spring prestressed tendon elastic concrete energy-absorbing connection node suitable for pile-plate structures. The purpose of the present invention is to reduce the stress concentration problem of the pile-plate nodes caused by the vibration of the road panel during operation through energy consumption, effectively improve the efficiency of assembly construction, and greatly save energy and resource consumption, so that the entire project complies with the national strategies of "green construction" and "dual carbon goals".

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A spring prestressed tendon elastic concrete energy-absorbing connection node suitable for a pile-plate structure, characterized in that it comprises a prefabricated road panel, a connecting pier, a prefabricated pipe pile, a locking mechanical connection device, upper and lower anchor plates, prestressed steel bars with energy-absorbing springs on the outside, and elastic concrete poured in a through channel, wherein the connecting pier is arranged between the lower prefabricated pipe pile and the upper prefabricated road panel, and is connected to the prefabricated pipe pile through the locking mechanical connection device, upper and lower anchor plates are respectively provided on the upper part of the prefabricated road panel and inside the prefabricated pipe pile, an up and down through channel is provided between the upper road panel, the connecting pier and the lower prefabricated pipe pile, the elastic concrete is poured inside the channel, the prestressed steel bars pass through the channel poured with the elastic concrete and connect the prefabricated road panel to the connecting pier through the upper and lower anchor plates.

[0007] Furthermore, the upper road panel is provided with a first hole, and the connecting pier is provided with a second hole. The first hole and the second hole are the same in shape and size and are connected vertically.

[0008] Furthermore, a pad is provided between the upper road panel and the connecting pier to reduce the node stiffness.

[0009] Furthermore, the connecting pier is connected to the lower prefabricated pipe pile by a locking mechanical connection device, wherein a female buckle of the locking device is provided at the lower end of the connecting pier, and a male lock of the locking device is provided at the upper end of the prefabricated pipe pile. The two are automatically connected by inserting the male lock head into the female buckle, and a spring and a small slot are provided in the middle of the female buckle of the locking device to facilitate connection and fixation.

[0010] Furthermore, the elastic concrete uses an elastic body with certain strength and ductility, such as rubber concrete and filled polymer, to reduce the rigidity of the connection between the pile and the plate.

[0011] Furthermore, the energy-absorbing spring is sleeved on the outside of the prestressed steel bar and is mainly used for absorbing energy, which can effectively reduce the stress concentration problem of the pile-plate node caused by the vibration of the road panel during operation.

[0012] Furthermore, the prestressed steel bar passes through the holes filled with elastic concrete reserved in the prefabricated road panel, the connecting pier and the prefabricated pipe piles, and one end is anchored to the lower anchor plate arranged at the bottom of the elastic concrete through an anchor nut. Then, the prestressed steel bar is tensioned at the other end, and the end is anchored to the upper anchor plate on the upper part of the prefabricated road panel with an anchor nut.

[0013] A method for assembling a spring prestressed tendon elastic concrete energy dissipation connection node applicable to a pile-slab structure, specifically comprising the following steps:

[0014] S1. After the prefabricated pipe piles are driven, the lower end of the prestressed steel bar is fixed to the lower anchor plate with anchor nuts in advance, and then lowered to the specified elevation in the prefabricated pipe piles and fixed.

[0015] S2. Hoist the connecting pier column above the prefabricated pipe pile and connect it to the prefabricated pipe pile through a locking mechanical connection device, while ensuring that the prestressed steel bar passes through the second channel.

[0016] S3. A pad is arranged at the upper end of the connecting pier, and an upper road panel is erected on the pad, so that the first connecting hole of the prefabricated road panel is aligned with the second connecting hole of the connecting pier up and down to form a through channel.

[0017] S4. Install the energy-absorbing spring on the outside of the prestressed steel bar through the through hole.

[0018] S5. Pour elastic concrete in the through-hole. When the elastic concrete reaches the designed strength, place the upper anchor plate above the upper road panel and apply prestress to the prestressed steel bars. After the designed prestress is reached, tighten and fix them on the upper anchor plate with anchor nuts.

[0019] S6. Cast the pavement post-casting layer on the prefabricated pavement panel.

[0020] Compared with the existing technology, the present invention has the following beneficial effects:

[0021] 1. The present invention adopts elastic concrete, energy-absorbing springs and prestressed steel bars in the node parts. The springs play a role in reducing the stress concentration problem at the pile-plate nodes caused by the vibration of the road slab during operation, and are mainly used for energy consumption; the prestressed steel bars play a role in enhancing the connection stiffness of the pile-plate, ensuring the reliability of the force performance of the pile-plate connection node, and limiting the large misalignment of the pile-plate; the elastic concrete is conducive to the application of prestress by the prestressed steel bars, and plastic deformation can occur when vibrating at the node, thereby consuming energy; the invention effectively solves the problem of excessive node stiffness and brittleness caused by the wet connection of the steel cage in the traditional method, and improves the energy consumption and fatigue damage resistance of the connection structure in earthquakes.

[0022] 2. The connecting pier column of the present invention is connected to the lower prefabricated pipe pile by a locking mechanical connecting device, which replaces the traditional welding, steel cage and steel plate anchoring connection method. It has a compact structure and exquisite design, eliminating the disadvantages of the traditional cast-in-place concrete connection structure with many temporary facilities and heavy on-site workload. The installation and disassembly of the components are relatively convenient, which greatly improves the construction efficiency of the pile-plate assembly and is beneficial to daily use, maintenance and inspection.

[0023] 3. The present invention adopts connecting piers to transfer force between the prefabricated pipe piles and the upper road panel, replacing the traditional method of erecting a steel frame, greatly saving material usage, achieving higher economic benefits and less environmental pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the axial cross-sectional structure of the connection structure of the present invention;

[0025] Figure 2 It is a structural schematic diagram of the prefabricated road panel of the present invention;

[0026] Figure 3 It is a schematic diagram of the structure of the connecting pier column of the present invention;

[0027] Figure 4 It is a structural schematic diagram of the prefabricated pipe pile of the present invention;

[0028] In the figure: 1. post-cast layer of road surface, 2. upper anchor plate, 3. anchor nut, 4. prefabricated road surface panel, 5. energy-absorbing spring, 6. pad, 7. locking-type mechanical connection device, 8. prestressed steel bar, 9. elastic concrete, 10. lower anchor plate, 11. anchor nut, 12. prefabricated pipe pile, 13. first channel, 14. connecting pier, 15. female buckle of locking-type mechanical connection device, 16. second channel, 17. male lock of locking-type mechanical connection device. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] Example 1

[0031] A spring prestressed tendon elastic concrete energy-absorbing connection node suitable for a pile-plate structure, characterized in that it comprises a prefabricated road panel 4, a connecting pier 14, a prefabricated pipe pile 12, a locking mechanical connection device 7, upper and lower anchor plates 2, 10, a prestressed steel bar 8 with an energy-absorbing spring 5 on the outside, and elastic concrete 9 poured in a through channel, wherein the connecting pier 14 is arranged between the lower prefabricated pipe pile 12 and the upper prefabricated road panel 4, and is connected to the prefabricated pipe pile 12 through the locking mechanical connection device 7, upper and lower anchor plates 2, 10 are respectively provided on the upper part of the prefabricated road panel 4 and inside the prefabricated pipe pile 12, a vertical through channel is provided between the upper road panel 4, the connecting pier 14 and the lower prefabricated pipe pile 12, the elastic concrete 9 is poured inside the channel, the prestressed steel bar 8 passes through the channel poured with the elastic concrete 9 and connects the prefabricated road panel 4 to the connecting pier 14 through the upper and lower anchor plates 2, 10.

[0032] In this embodiment, the upper road panel 4 is provided with a first hole 13, and the connecting pier 14 is provided with a second hole 16. The first hole 13 and the second hole 16 have the same shape and size and are connected vertically.

[0033] In this embodiment, a pad 6 is provided between the upper road panel 4 and the connecting pier 14 to reduce the node stiffness.

[0034] In this embodiment, the connecting pier 14 is connected to the lower prefabricated pipe pile 12 through a locking type mechanical connecting device 7, wherein the lower end of the connecting pier 14 is provided with a female buckle 15 of the locking device, and the upper end of the prefabricated pipe pile 12 is provided with a male lock 17 of the locking device. The two are automatically connected by inserting the locking head of the male lock 17 into the female buckle 15. A spring and a small slot are provided in the middle of the female buckle 15 of the locking device to facilitate connection and fixation.

[0035] In this embodiment, the elastic concrete 9 is made of an elastic body with certain strength and ductility, such as rubber concrete and filled polymer, and is used to reduce the rigidity of the connection between the pile and the plate.

[0036] In this embodiment, the energy-absorbing spring 5 is sleeved on the outside of the prestressed steel bar 8 and is mainly used for absorbing energy, which can effectively reduce the stress concentration problem of the pile-plate node caused by the vibration of the road panel during operation.

[0037] In this embodiment, the prestressed steel bar 8 passes through the reserved holes filled with elastic concrete 9 of the prefabricated road panel 4, the connecting pier 14 and the prefabricated pipe piles 12, and one end is anchored to the lower anchor plate 10 arranged at the bottom of the elastic concrete 9 through the anchor nut 11. Then, the prestressed steel bar 8 is tensioned at the other end and anchored to the upper anchor plate 2 on the upper part of the prefabricated road panel 4 with the anchor nut 3.

[0038] Example 2

[0039] A method for assembling spring prestressed tendon elastic concrete energy dissipation connection nodes suitable for pile-slab structures, such as Figure 1-4 As shown, it specifically includes the following steps:

[0040] S1. After the prefabricated pipe pile 12 is driven, the lower end of the prestressed steel bar 8 is fixed to the lower anchor plate 10 with the anchor nut 11 in advance, and is lowered to the prefabricated pipe pile 12 at a specified elevation and fixed.

[0041] S2, hoisting the connecting pier 14 above the prefabricated pipe pile 12 and connecting it to the prefabricated pipe pile 12 through the locking mechanical connecting device 7, while ensuring that the prestressed steel bar 8 passes through the second channel 16.

[0042] S3. A pad 6 is provided at the upper end of the connecting pier 14, and an upper road panel 4 is mounted on the pad 6, so that the first connecting hole 13 of the prefabricated road panel is aligned with the second connecting hole 16 of the connecting pier to form a through channel.

[0043] S4, sleeve the energy-absorbing spring 5 onto the outside of the prestressed steel bar 8 through the through hole.

[0044] S5. Pour elastic concrete 9 in the through-hole. After the elastic concrete 9 reaches the designed strength, arrange the upper anchor plate 2 above the upper road panel 4, and tension the prestressed steel bars 8 to apply prestress. After reaching the designed prestress, tighten and fix them on the upper anchor plate 2 with anchor nuts 3.

[0045] S6. Casting the pavement post-casting layer 1 on the prefabricated pavement panel 4.

Claims

1. A spring prestressed tendon elastic concrete energy dissipation connection node suitable for pile-slab structure, characterized in that: It includes a prefabricated road panel, a connecting pier, a prefabricated pipe pile, a locking mechanical connection device, upper and lower anchor plates, prestressed steel bars with energy-absorbing springs on the outside, and elastic concrete poured in a through channel. The connecting pier is arranged between the lower prefabricated pipe pile and the upper prefabricated road panel, and is connected to the prefabricated pipe pile through the locking mechanical connection device. Upper and lower anchor plates are respectively provided on the upper part of the prefabricated road panel and inside the prefabricated pipe pile. A through channel is provided between the upper road panel, the connecting pier and the lower prefabricated pipe pile, and the elastic concrete is poured inside the channel. The prestressed steel bars pass through the channel poured with the elastic concrete and connect the prefabricated road panel to the connecting pier through the upper and lower anchor plates.

2. The spring prestressed tendon elastic concrete energy dissipation connection node suitable for pile-slab structure according to claim 1, characterized in that: The upper road panel is provided with a first hole, and the connecting pier is provided with a second hole. The first hole and the second hole are the same in shape and size and are connected vertically.

3. The spring prestressed tendon elastic concrete energy dissipation connection node suitable for pile-slab structure according to claim 1, characterized in that: A pad is provided between the upper road panel and the connecting pier to reduce the node stiffness.

4. The spring prestressed tendon elastic concrete energy dissipation connection node suitable for pile-slab structure according to claim 1, characterized in that: The connecting pier column and the lower prefabricated pipe pile are connected by a locking mechanical connecting device, wherein the lower end of the connecting pier column is provided with a female buckle of the locking device, and the upper end of the prefabricated pipe pile is provided with a male lock of the locking device, and the two are automatically connected by inserting the male lock head into the female buckle, and a spring and a small slot are provided in the middle of the female buckle of the locking device to facilitate connection and fixation.

5. The spring prestressed tendon elastic concrete energy dissipation connection node suitable for pile-slab structure according to claim 1, characterized in that: The energy dissipation spring is sleeved on the outside of the prestressed steel bar and is mainly used for dissipating energy, which can effectively reduce the stress concentration problem of the pile-plate node caused by the vibration of the road panel during operation.

6. The spring prestressed tendon elastic concrete energy dissipation connection node suitable for pile-slab structure according to claim 1, characterized in that: The elastic concrete adopts elastic bodies with certain strength and ductility, such as rubber concrete and filled polymer, to reduce the rigidity of the connection part between the pile column and the plate.

7. The spring prestressed tendon elastic concrete energy dissipation connection node suitable for pile-slab structure according to claim 1, characterized in that: The prestressed steel bar passes through the holes filled with elastic concrete reserved in the prefabricated road panel, the connecting pier and the prefabricated pipe piles, and one end is anchored to the lower anchor plate arranged at the bottom of the elastic concrete through an anchor nut. Then, the prestressed steel bar is tensioned at the other end and anchored to the upper anchor plate on the upper part of the prefabricated road panel with an anchor nut.

8. The method for assembling spring prestressed tendon elastic concrete energy dissipation connection nodes suitable for pile-slab structures according to claims 1-6, characterized in that: The specific steps include the following: S1. After the prefabricated pipe piles are driven, the lower end of the prestressed steel bar is fixed to the lower anchor plate with anchor nuts in advance, and then lowered to the specified elevation in the prefabricated pipe piles and fixed. S2. Hoist the connecting pier column above the prefabricated pipe pile and connect it to the prefabricated pipe pile through a locking mechanical connection device, while ensuring that the prestressed steel bar passes through the second channel. S3. A pad is arranged at the upper end of the connecting pier, and an upper road panel is erected on the pad, so that the first connecting hole of the prefabricated road panel is aligned with the second connecting hole of the connecting pier up and down to form a through channel. S4. Install the energy-absorbing spring on the outside of the prestressed steel bar through the through hole. S5. Pour elastic concrete in the through-hole. When the elastic concrete reaches the designed strength, place the upper anchor plate above the upper road panel and apply prestress to the prestressed steel bars. After the designed prestress is reached, tighten and fix them on the upper anchor plate with anchor nuts. S6. Cast the pavement post-casting layer on the prefabricated pavement panel.

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