CN114808928A - Connecting joint of assembled pile plate structure and construction method - Google Patents

Abstract

The invention discloses an assembled pile plate structure connecting node which comprises a precast concrete plate positioned on the upper part, a precast pile plate joint positioned below the precast concrete plate, and a precast PRC (prestressed concrete) tubular pile connected with the bottom of the precast pile plate joint; the construction method of the assembled pile-plate structure connecting node comprises the following steps of: s1, preliminarily determining structural materials, arrangement sizes and quantity; s2, prefabricating a component; s3, splicing and connecting the prefabricated PRC pipe pile and a prefabricated pile plate joint; s4, splicing and connecting the precast pile plate joint with the precast concrete plate; and S5, sealing the cover. The invention integrally adopts a prefabricated construction mode, can realize the high-efficiency construction of the pile plate structure node, improve the earthquake energy consumption capability of the pile plate structure, realize the earthquake self-resetting function of the pile plate connecting node and reduce the repair work and cost after the earthquake.

Description

A kind of prefabricated pile-plate structure connecting node and construction method

technical field

The invention relates to the field of assembled pile-slab roadbed structures, in particular to a connection node of an assembled pile-slab structure and a construction method.

Background technique

The prefabricated pile-slab subgrade structure has been gradually applied in the field of highway construction in my country in recent years. The structure is mainly composed of a frame structure system consisting of prefabricated pile foundations, prefabricated slabs and pile-slab joints. Compared with the traditional subgrade, it replaces the original filling. The soil subgrade realizes the rapid industrial construction of the subgrade, and has the advantages of saving land resources, shortening the construction period, reducing the project cost, and small settlement of the subgrade structure.

Since the pile-slab roadbed is a new type of roadbed, it is rarely used in highway engineering at present. The structure adopts the prefabricated pipe pile foundation to extend directly above the ground to support the prefabricated plate, so the prefabricated pipe pile should have the function of connecting the top and bottom of the foundation, and at the same time It also needs to have the bearing effect of the bridge pier, that is, it should have a certain compressive resistance, bending resistance and strong shear bearing capacity.

However, the existing commonly used pile-slab structures are still insufficient in terms of structural earthquake resistance. They use the pipe piles above the ground as capacity protection components, and design the cast-in-place joints of the piles as plastic hinges to form an energy dissipation mechanism. The ductile deformation of the plate connection node achieves the purpose of energy consumption. Under the action of the earthquake load, the damage of the plate pile connection node generally occurs on the pipe pile. When the pipe pile is seriously damaged, it may lead to the collapse of the superstructure. When the pipe pile is not damaged, the later stage The repair structure also needs to replace the whole pipe pile, and the repair cost is high, so this design brings new problems to the node repair and replacement of the post-earthquake assembled pile-slab structure; at the same time, the existing pile-slab structure has not considered the pile-slab connection node The earthquake self-resetting function design is designed to reduce the damage of pile-slab joints under earthquake action and the repair work of pile-slab joints after earthquakes; The construction of semi-rigid joints of cross-steel plate joints and pile-to-plate joints requires cast-in-place concrete, which affects the construction efficiency.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the deficiencies in the prior art, and to provide a prefabricated pile-slab structure connection node and a construction method. Construction, improve the seismic energy dissipation capacity of the pile-plate structure, realize the seismic self-reset function of the pile-plate connection node, and effectively reduce the repair work and component replacement cost of the post-earthquake structure.

In order to achieve the above purpose, the present invention adopts the following technical scheme: a prefabricated pile-slab structure connection node, comprising a prefabricated concrete slab located at the upper part, a prefabricated pile-slab joint located below the prefabricated concrete slab, and a bottom connection with the prefabricated pile-slab joint. The prefabricated PRC pipe pile; the middle part of the prefabricated concrete slab is provided with a reserved hole whose cross section is circular and penetrates up and down, and the reserved hole includes a large-diameter hole in the upper part and a small-diameter hole in the lower part. The height is less than the height of the small-diameter hole, the prefabricated pile-plate joint includes a pile-plate joint cylinder located in a cylindrical shape at the lower part and a conical joint boss at the upper part, and the upper surface of the pile-plate joint cylinder is connected to the joint boss. The bottom surface of the joint is fixedly connected, the joint boss is inserted into the small diameter hole, an elastic washer is arranged between the precast concrete slab and the prefabricated pile joint, the bottom surface of the gasket is fixed with the upper surface of the pile joint cylinder, the gasket The upper surface of the pile is in contact with the bottom surface of the precast concrete slab, the washer is set on the outside of the joint boss in a circular shape, the diameter of the washer is the same as the diameter of the pile-to-plate joint cylinder, and the large-diameter hole is along the outer circumference of the small-diameter hole, etc. There are prestressed pipes buried in the distance, and the prestressed pipes pass downward through the pile-plate joint cylinder and are inserted into the interior of the prefabricated PRC pipe piles. The prestressed pipes are provided with prestressed steel bundles. The prestressed hole through which the prestressed pipeline passes, and the rubber cushion is filled between the joint boss and the small diameter hole.

Further, the height of the large-diameter hole does not exceed 1/4 of the height of the precast concrete slab where it is located, and the diameter of the large-diameter hole is not less than the diameter of the pile-plate joint cylinder.

Further, the height of the pile-plate joint cylinder is equal to 1-2 times the diameter, the diameter of the pile-plate joint cylinder is the same as the diameter of the prefabricated PRC pipe pile, and the height of the joint boss is the same as the height of the small diameter hole. , the concrete strength grade of the prefabricated pile-plate joint is not less than the concrete strength grade of the prefabricated PRC pipe pile.

Further, the joint boss and the pile-plate joint cylinder are provided with longitudinal reinforcement of the steel cage in the joint and circumferential spiral stirrup similar to the conventional pile foundation, and the circumferential spiral stirrup is located outside the prestressed pipe.

Further, the bottom of the pile plate joint cylinder and the top of the prefabricated PRC pipe pile are each fixedly connected with an end plate with a through hole in the middle, the two end plates are connected by fillet welding, and a ferrule is fixed on the outside of the end plate. , the end plate is also provided with prestressed holes for the prestressed pipes to pass through, and the end plate is circular in cross section and the diameter is the same as the diameter of the pile-plate joint cylinder.

Further, the prefabricated PRC pipe pile is provided with a circular prestressed anchoring plate with a through hole in the middle at 1.4-1.6m downward, the thickness of the prefabricated anchoring plate is 5mm, and the prefabricated PRC pipe pile is provided with a pipe pile. The outer ring longitudinal reinforcement, the outer ring longitudinal reinforcement of the pipe pile is fixedly connected with the pipe pile stirrup, the prestressed anchoring plate is inscribed in the outer ring longitudinal reinforcement of the pipe pile, and the prestressed anchoring plate is connected with the outer ring longitudinal reinforcement of the pipe pile and the pipe pile hoop. The rib is welded as a whole, and the prestressed anchor plate is provided with a pipe pile reinforced longitudinal reinforcement within the range of the pile diameter below the prestressed anchor plate. The stress anchoring plate is provided with holes for the passage of the intensified longitudinal bars and prestressed holes for the passage of the prestressed pipes, and the prestressed holes are located between the intensified longitudinal bars of the pipe pile and the outer ring longitudinal bars of the pipe pile.

Further, the outer side of the prestressed anchor plate is longitudinally fixed with prestressed steel bars on the outer ring of the pipe pile, and the prestressed steel bars on the outer ring of the pipe pile and the longitudinal bars of the outer ring of the pipe pile are staggered along the outer side of the prestressed anchor plate. The upper ring is equidistantly distributed with prestressed steel bundles, the prestressed steel bundles are sheathed with plastic sleeves, and the top end is located in the large-diameter hole after passing through the prestressed hole and the prestressed pipe upward, and concrete is poured in the large-diameter hole.

The construction method of the above-mentioned prefabricated pile-plate structure connection node includes the following steps:

S1. Preliminary determination of structural materials, layout size and quantity: Preliminarily determine the geometry of the pile-to-plate joint column and joint boss according to the geometrical dimensions, material parameters and superstructure load of the precast concrete slab and prefabricated PRC pipe pile required for the actual erection position Size; determine the respective quantity and arrangement of the longitudinal reinforcement of the steel cage and the circumferential spiral stirrup in the joint; preliminarily determine the area, arrangement position and tension control force of the prestressed steel bundle required for the connection between the pile and plate; determine the lower prefabricated PRC pipe The size, material and position of the prestressed anchoring plate added inside the pile, determine the respective quantity and arrangement of the pipe pile dense longitudinal reinforcement, the pipe pile outer ring longitudinal reinforcement, the pipe pile stirrup and the pipe pile outer ring prestressed reinforcement;

S2. Prefabricated component stage: Prefabricated prefabricated concrete slabs need to be accurately opened with reserved holes. At the same time, prestressed pipes are evenly embedded in the circumferential direction in the large-diameter holes. The size of the large-diameter holes must be able to meet the tension and Anchorage space requirements; in the process of manufacturing prefabricated PRC pipe piles, at the stage of tying steel bars, prestressed anchor plates are added to the design positions in the prefabricated PRC pipe piles, and are connected with the outer ring longitudinal bars of the surrounding pipe piles, pipe pile stirrups and pipe piles The outer ring prestressed steel bars are welded and fixed to form a steel skeleton. On the prestressed anchor plate and the lower area, the pipe pile reinforced longitudinal bars and stirrups are added to form an ordinary steel reinforcement area. Welding and fixing, the spacing of the circumferential spiral stirrups is densified. At the same time, the prestressed anchoring plate needs to reserve the holes through which the longitudinal reinforcement of the pipe piles pass through and the prestressed holes during processing. The size matches the diameter of the prestressed steel bundle, and the position is accurate; one end of the prestressed steel bundle is anchored on the prestressed anchoring plate, and covered with a plastic sleeve, and the other end of the prestressed steel bundle extends vertically to the pile head of the prefabricated PRC pipe pile Externally, positioning steel bars can be used to accurately position the prestressed pipes to prevent deflection; after all the components are positioned accurately in the stage of binding steel bars and the binding and welding are completed, then the prefabricated PRC pipe pile concrete is poured and cured until the concrete reaches the design strength; The pile-plate joint can be prefabricated according to the design size, and attention should be paid to the accuracy of the positioning of the prestressed pipe in it;

S3. Assembled connection of prefabricated PRC pipe piles and prefabricated pile-plate joints: Drive each segment of prefabricated PRC pipe piles into the ground to the design elevation, and complete the connection between the prefabricated PRC pipe piles in the top section and the prefabricated PRC pipe piles in the lower section. The pile-slab joint is suspended above the prefabricated PRC pipe pile at the top section, and the prestressed steel bundle reserved at the top is passed through the pre-stressed pipe preset in the prefabricated pile-slab joint, and then the prefabricated pile-slab joint is slowly dropped and moved. It is placed on the prefabricated PRC pipe pile, and finally the end plate under the pile-plate joint column is connected with the top plate of the prefabricated PRC pipe pile by fillet weld;

S4. Assembled connection of prefabricated pile-slab joint and prefabricated concrete slab: Suspend the prefabricated concrete slab above the prefabricated pile-slab joint, put a washer on the top of the pile-slab joint column, wrap the rubber cushion around the joint boss, and put the The prestressed steel bundles protruding from the top of the precast pile-slab joints pass through the prestressed pipes set in the precast concrete slabs above, and then slowly drop the precast concrete slabs and place them on the precast pile-slab joints. The gaps between the small-diameter holes are filled up. After the positions of the prefabricated PRC pipe piles, prefabricated pile-slab joints, and prefabricated concrete slabs at the top section are adjusted and stabilized, the prestressed steel bundles are tensioned and anchored in batches on the top of the prefabricated concrete slabs. , the tension control force is strictly in accordance with the design value;

S5. Covering: Finally, pour concrete above the reserved holes of the precast concrete slab to cover the reserved holes.

其中，σ_con为预应力张拉控制应力；σ_p为预制PRC管桩内已配预应力钢筋在截面内产生的压应力；N为单根管桩承受的轴力；M为单根管桩承受的弯矩；A为管桩截面面积；W为管桩截面模量；f_tk为管桩混凝土材料抗拉强度标准值。Further, the determination formula of the tension control force in the step S4 is:

Among them, σ _con is the prestressed tension control stress; σ _p is the compressive stress generated by the prestressed steel bars in the prefabricated PRC pipe pile in the section; N is the axial force borne by a single pipe pile; M is the single pipe pile Bending moment; A is the section area of the pipe pile; W is the section modulus of the pipe pile; f _tk is the standard value of the tensile strength of the concrete material of the pipe pile.

The beneficial effects of the present invention are:

1. Set up prefabricated pile-slab joints between prefabricated PRC pipe piles and prefabricated concrete slabs, and design them as reinforced concrete ductile members. Under the action of earthquake loads, the prefabricated pile-slab joints can occur ductile deformation or ductile deformation when the sheet pile joints are damaged. The staggered movement consumes more seismic energy, so that more joint damage occurs on the precast pile-slab joints, and avoids damage to the pipe piles, and then the post-earthquake structural repair only needs to repair and replace the precast concrete joints, which is convenient for construction , Save repair costs, facilitate post-disaster repair and have good economic benefits.

2. The rubber cushion and gasket set between the prefabricated pile plates allow the relative elastic deformation between the prefabricated pile plate joints and the prefabricated concrete plates, and under the action of earthquake loads, the prefabricated joints have good energy dissipation and shock absorption; in addition , the connection between the prefabricated joint and the prefabricated pipe pile is weak, and the reciprocating horizontal shear dislocation can occur between the two under strong earthquake action, and then the seismic energy consumption can be converted into potential energy. Under the action of vertical prestressed back tension, it can effectively enhance the horizontal shear dislocation reset ability between the concrete slab, the joint and the pipe pile, thereby reducing the replacement and repair work of the prefabricated joint after the disaster. Therefore, the assembled pile-sheet connection node has a good seismic self-resetting function, and the sheet pile node has good seismic performance.

3. The rubber cushion and gasket set between the prefabricated pile-slab joint and the prefabricated concrete slab can make the connection between the two between consolidation and hinge, and a certain elastic deformation is allowed between the two. There are concrete wet joints, which can effectively reduce the additional internal forces generated in the structure such as temperature, settlement, and concrete shrinkage and creep, and further effectively reduce the occurrence of cracks in the upper structure.

4. The present invention uses prefabricated concrete joints for pile-to-plate connection. The concrete joints can be prefabricated in the factory, and the pile-to-plate connection can be completed by simply assembling and connecting at the construction site. Compared with the existing cast-in-place concrete rigid joint construction, the construction of on-site concrete Pouring and curing time, speed up the construction progress and improve the construction efficiency.

Description of drawings

Fig. 1 is the front view structure schematic diagram of the present invention;

Fig. 2 is the precast concrete slab reserved hole position structure schematic diagram of the present invention;

Figure 3 is a schematic diagram of the structure of the gasket of the present invention;

Fig. 4 is the structural schematic diagram of the prefabricated pile-plate joint of the present invention;

5 is a schematic diagram of the arrangement structure of common steel bars inside the prefabricated pile-to-plate joint of the present invention;

Fig. 6 is the top structure schematic diagram of the lower prefabricated PRC pipe pile of the present invention;

Fig. 7 is the structural schematic diagram of the lower prefabricated PRC pipe pile of the present invention;

Figure 8 is a schematic diagram of the structure of the internal steel reinforcement at the top of the lower prefabricated PRC pipe pile of the present invention;

FIG. 9 is a schematic diagram of the cross-sectional structure of A-A in FIG. 8 .

In the figure: 1. Prefabricated concrete slab; 2. Prefabricated pile-slab joint; 3. Prefabricated PRC pipe pile; 4. Washer; 5. Prestressed anchor plate; 6. Prestressed steel bundle; Stress pipeline; 9. Joint boss; 10. End plate; 11. Pile-plate joint column; 12. Prestressed hole; 13. Intensified longitudinal reinforcement of pipe pile; 14. Longitudinal reinforcement of outer ring of pipe pile; 15. Pipe pile hoop 16. Longitudinal reinforcement of steel cage in the joint; 17. Circumferential spiral stirrup; 18. Prestressed steel bar in the outer ring of the pipe pile 19. Rubber cushion.

Detailed ways

The present invention will be further explained below with reference to the accompanying drawings and specific embodiments.

Example:

As shown in Figures 1-9, a prefabricated pile-slab structure connection node includes a precast concrete slab 1 located at the upper part, a prefabricated pile-slab joint 2 located below the prefabricated concrete slab 1, and a prefabricated pile-slab joint 2 connected to the bottom. Prefabricated PRC pipe pile 3; the middle of the prefabricated concrete slab 1 is provided with a reserved hole 7 whose cross section is circular and penetrates up and down. The reserved hole 7 includes a large diameter hole in the upper part and a small diameter hole in the lower part. The height of the large diameter hole It is 120mm, and the prefabricated pile joint 2 includes a pile joint cylinder 11 that is cylindrical in the lower part and a conical joint boss 9 on the upper part. The upper surface of the pile joint cylinder 11 is fixedly connected to the bottom surface of the joint boss 9 , the joint boss 9 is inserted into the small diameter hole, an elastic washer 4 is arranged between the prefabricated concrete slab 1 and the prefabricated pile slab joint 2, the washer 4 is selected from elastic deformation materials, and rubber or modified polyurethane material can be selected; The rubber cushion 19 and the gasket 4 arranged between the plate joint 2 and the precast concrete plate 1 can make the connection between the two between consolidation and hinge, and allow a certain elastic deformation between the two. Compared with the existing Concrete wet joints can effectively reduce the additional internal forces caused by temperature, settlement, concrete shrinkage and creep, etc., and then effectively reduce the occurrence of cracking of the upper structure. At the same time, under the action of vehicles or earthquakes, the elastic deformation of rubber can effectively consume vibration energy. Reduce the degree of structural vibration; the bottom surface of the washer 4 is fixed with the upper surface of the pile-plate joint cylinder 11, the upper surface of the washer 4 is in contact with the bottom surface of the precast concrete slab 1, and the washer 4 is circularly sleeved on the outer side of the joint boss 9, The diameter of the gasket 4 is the same as the diameter of the pile-plate joint cylinder 11, and the prestressed pipes 8 are embedded in the large-diameter hole at equal distances along the outer circumference of the small-diameter hole. The prestressed pipes 8 pass downward through the pile-plate joint cylinder 11 and are inserted into Inside the prefabricated PRC pipe pile 3, the prestressed pipe 8 is provided with a prestressed steel bundle 6, and the washer 4 is provided with prestressed holes 12 for the prestressed pipe 8 to pass through at an equal distance. The space is filled with a rubber cushion 19;

A prefabricated pile-slab joint 2 is arranged between the prefabricated PRC pipe pile 3 and the prefabricated concrete slab 1, and it is designed as a ductile member of a reinforced concrete member. Under the action of the earthquake load, the prefabricated pile-slab joint 2 can occur when the sheet pile joint is damaged. Ductile deformation or dislocation can consume more seismic energy, so that more joint damage occurs on the prefabricated pile-slab joint 2, while avoiding damage to the pipe pile, and then the post-earthquake structural repair only needs to repair and replace the prefabricated pile-slab joint 2 is enough, the construction is convenient, the repair cost is saved, the post-disaster repair is convenient, and it has good economic benefits; the rubber cushion 19 and the gasket 4 arranged between the prefabricated pile plates allow the prefabricated pile plate joint 2 and the prefabricated concrete plate 1 There is a relative relationship between them. Elastic deformation, under the action of earthquake load, makes the prefabricated joint have good energy dissipation and shock absorption; in addition, the connection between the prefabricated pile-plate joint 2 and the prefabricated PRC pipe pile 3 is weak, and under strong earthquake action, the two Reciprocating horizontal shear dislocation can occur between them, and then the seismic energy consumption can be converted into potential energy. At the same time, under the action of vertical prestressed back tension, it can effectively strengthen the precast concrete slab 1 and the precast pile-slab joints. 2 and the prefabricated PRC pipe pile 3, the horizontal shear dislocation reset ability, which in turn reduces the replacement and repair work of the prefabricated joint after the disaster. Therefore, the assembled pile-plate connection node has a good earthquake self-resetting function, and the sheet pile node Good seismic performance.

The height of the large-diameter hole does not exceed 1/4 of the height of the precast concrete slab 1 where it is located, and the diameter of the large-diameter hole is not less than the diameter of the pile-plate joint column 11 .

The height of the pile-plate joint cylinder 11 is equal to 1 to 2 times the diameter, the diameter of the pile-plate joint cylinder 11 is the same as the diameter of the prefabricated PRC pipe pile 3, and the height of the joint boss 9 is the same as the height of the small diameter hole. The concrete strength grade of plate joint 2 is not less than that of prefabricated PRC pipe pile 3 concrete strength grade.

The joint boss 9 and the pile-plate joint cylinder 11 are provided with inner-joint steel cage longitudinal bars 16 and circumferential spiral stirrups 17 similar to conventional pile foundations.

The bottom of the pile plate joint cylinder 11 and the top of the prefabricated PRC pipe pile 3 are each fixedly connected with an end plate 10 with a through hole in the middle, the two end plates 10 are connected by fillet welding, and the outer side of the end plate 10 is fixed with a ferrule , the end plate 10 is also provided with prestressed holes 12 for the prestressed pipes 8 to pass through.

The prefabricated PRC pipe pile 3 is provided with a circular prestressed anchoring plate 5 with a through hole in the middle at a position of 1.5m downward. The thickness of the prestressed anchoring plate 5 is 5mm. The rib 14, the outer ring longitudinal rib 14 of the pipe pile is fixedly connected with the pipe pile stirrup 15, the prestressed anchor plate 5 is inscribed in the outer ring longitudinal rib 14 of the pipe pile, and the prestressed anchor plate 5 is connected with the pipe pile outer ring longitudinal rib 14 It is welded with the pipe pile stirrups 15 as a whole, and the prestressed anchoring plate 5 is provided with a pipe pile intensified longitudinal reinforcement 13 within the range of twice the pile diameter. The anchoring plate 5 is welded, and the prestressed anchoring plate 5 is also provided with holes for the dense longitudinal bars to pass through and the prestressed holes 12 for the prestressed pipes 8 to pass through. Between the longitudinal bars 14 of the outer ring of the pipe pile.

The outer side of the prestressed anchoring plate 5 is longitudinally fixed with a prestressed steel bar 18 on the outer ring of the pipe pile. The prestressed steel bundles 6 are distributed equidistantly in the ring. The prestressed steel bundles 6 are covered with plastic sleeves, and the top end is located in the large diameter hole after passing through the prestressed hole 12 and the prestressed pipe 8 upward, and concrete is poured in the large diameter hole.

The construction method of the above-mentioned prefabricated pile-plate structure connection node includes the following steps:

S1. Preliminary determination of structural materials, layout size and quantity: Preliminarily determine the pile-plate joint column 11 and joint convexity according to the geometric dimensions, material parameters and superstructure load of the precast concrete slab 1 and the prefabricated PRC pipe pile 3 required for the actual erection position The geometric dimensions of the platform 9; determine the respective quantity and arrangement of the longitudinal bars 16 of the reinforcing cage and the circumferential spiral stirrups 17 in the joint; preliminarily determine the area, arrangement position and tension control of the prestressed steel bundles 6 required for the pile-to-plate connection node Determine the size, material and position of the prestressed anchoring plate 5 added inside the lower prefabricated PRC pipe pile, determine the pipe pile dense longitudinal reinforcement 13, the pipe pile outer ring longitudinal reinforcement 14, the pipe pile stirrup 15 and the pipe pile outer ring prestress The respective quantity and arrangement of the reinforcing bars 18;

S2. Prefabricated component stage: Prefabricated concrete slab 1 needs to be accurately opened with reserved holes 7 during prefabrication. At the same time, prestressed pipes 8 are evenly embedded in the large-diameter hole along the circumferential direction. The size of the large-diameter hole needs to meet the prestressed steel bundle Tensioning and anchoring space requirements; in the process of manufacturing the prefabricated PRC pipe pile 3, at the stage of tying the steel bars, the prestressed anchoring plate 5 is added to the design position in the prefabricated PRC pipe pile 3, and is connected with the outer ring longitudinal bars 14 and 14 of the surrounding pipe pile. The pipe pile stirrup 15 and the pipe pile outer ring prestressed steel bar 18 are welded and fixed to form a steel skeleton, and the pipe pile encrypted longitudinal reinforcement 13 and the encrypted stirrup are added to the upper and lower areas of the prestressed anchor plate 5 to form a common steel reinforcement area, and the pipe pile is encrypted. The longitudinal bars 13 need to pass through the prestressed anchoring plate 5 and be fixed by welding, and the circumferential spiral stirrups 17 are densely spaced. Stress hole 12, the diameter of the hole needs to match the longitudinal reinforcement, the diameter of the prestressed hole 12 matches the diameter of the prestressed steel bundle 6, and the position is accurate; Anchor one end of the prestressed steel bundle 6 on the prestressed anchor plate 5 , and jacketed with plastic casing, the other end of the prestressing extends vertically to the outside of the pile head of the prefabricated PRC pipe pile 3. At this time, positioning steel bars can be used to accurately position the prestressed pipe 8 to prevent deflection; all components in the stage of binding steel bars After the positioning is accurate and the binding and welding are completed, the concrete of the prefabricated PRC pipe pile 3 is poured and cured until the concrete reaches the design strength; the prefabricated pile-to-plate joint 2 can be prefabricated according to the design size, and attention should be paid to the precise positioning of the prestressed pipe 8 in it. sex;

S3. Assemble and connect the prefabricated PRC pipe pile 3 and the prefabricated pile-plate joint 2: drive the prefabricated PRC pipe pile 3 of each segment into the ground to the design elevation, and complete the connection between the prefabricated PRC pipe pile in the top section and the prefabricated PRC pipe pile 3 in the lower section Then, the prefabricated pile-slab joint 2 is suspended above the prefabricated PRC pipe pile 3 at the top section, and the pre-stressed steel bundle 6 reserved at the top is passed through the preset pre-stressed pipe 8 in the prefabricated pile-slab joint 2, and then Slowly drop the prefabricated pile plate joint 2 and place it on the prefabricated PRC pipe pile 3, and finally use the fillet weld to connect the end plate 10 under the pile plate joint cylinder 11 with the prefabricated PRC pipe pile 3 pile top plate 10;

S4. The prefabricated pile-slab joint 2 is assembled and connected with the prefabricated concrete slab 1: the prefabricated concrete slab 1 is suspended above the prefabricated pile-slab joint 2, the washer 4 is put on the top of the pile-slab joint cylinder 11, and the periphery of its joint boss 9 The rubber cushion layer 19 is wrapped, and the prestressed steel bundle 6 extending from the top of the precast pile-slab joint 2 is passed through the prestressed pipe 8 provided in the precast concrete slab 1 above, and then the precast concrete slab 1 is slowly dropped and placed on the precast pile. On the plate joint 2, the rubber cushion 19 is used to fill the gap between the joint boss 9 and the small diameter hole, and the position of the three components of the prefabricated PRC pipe pile 3, the prefabricated pile-to-plate joint 2, and the prefabricated concrete slab 1 of the top section is adjusted. After the stabilization, the prestressed steel bundles 6 are tensioned and anchored in batches on the top of the precast concrete slab 1, and the tension control force is strictly carried out according to the design value;

其中，σ_con-为预应力张拉控制应力；σ_p-为预制PRC管桩内已配预应力钢筋在截面内产生的压应力；N-单根管桩承受的轴力；M-单根管桩承受的弯矩；A-管桩截面面积；W-管桩截面模量；f_tk-管桩混凝土材料抗拉强度标准值。The prestressed tension control force is determined by calculation. The specific calculation process is as follows: through the structural analysis in the early stage, considering the effect of each load action on the structure including the earthquake action effect, and carrying out the load action of the normal service limit state, permanent state and transient state, etc. Effect combination, the prestressed tension control stress is based on the tension of the concrete material of the pipe pile as the criterion, and the following relationship should be satisfied:

Among them, σ _con - is the prestressed tension control stress; σ _p - is the compressive stress generated in the section by the prestressed steel bars in the prefabricated PRC pipe pile; N - the axial force of a single pipe pile; M - a single pipe pile Bending moment of pipe pile; A-pipe pile section area; W-pipe pile section modulus; f _tk - standard value of tensile strength of pipe pile concrete material.

S5. Covering: Finally, pour concrete above the reserved holes 7 of the precast concrete slab 1 to cover the reserved holes 7 .

The invention adopts prefabricated concrete joints for pile-plate connection, the concrete joints can be prefabricated in the factory, and the pile-plate connection can be completed by simply assembling and connecting at the construction site. The maintenance time is shortened, the construction progress is accelerated, and the construction efficiency is improved.

The above is only used to illustrate the technical solution of the present invention and not to limit it. Other modifications or equivalent replacements made by those of ordinary skill in the art to the technical solution of the present invention, as long as they do not depart from the spirit and scope of the technical solution of the present invention, should be Included within the scope of the claims of the present invention.

Claims (9)

1. A prefabricated pile-slab structure connection node, characterized in that: it comprises a prefabricated concrete slab (1) located on the upper part, a prefabricated pile slab joint (2) located below the prefabricated concrete slab (1), and a prefabricated pile slab joint (2). (2) A prefabricated PRC pipe pile (3) connected at the bottom; the middle of the prefabricated concrete slab (1) is provided with a reserved hole (7) which is circular in cross section and penetrates up and down, and the reserved hole (7) It comprises a large-diameter hole in the upper part and a small-diameter hole in the lower part, the height of the large-diameter hole is smaller than the height of the small-diameter hole, and the prefabricated pile-to-plate joint (2) comprises a cylindrical pile-to-plate joint cylinder (11) and A joint boss (9) with a circular truncated upper part, the upper surface of the pile-plate joint cylinder (11) is fixedly connected with the bottom surface of the joint boss (9), and the joint boss (9) is inserted into the inside of the small diameter hole , an elastic washer (4) is provided between the precast concrete slab (1) and the prefabricated pile-slab joint (2), the bottom surface of the washer (4) is fixed with the upper surface of the pile-slab joint cylinder (11), and the washer The upper surface of (4) is in contact with the bottom surface of the precast concrete slab (1), the washer (4) is circularly sleeved on the outer side of the joint boss (9), and the diameter of the washer (4) is the same as that of the pile-plate joint cylinder (11). ) of the same diameter, the large-diameter holes are equidistantly embedded with prestressed pipes (8) along the outer circumference of the small-diameter holes, and the prestressed pipes (8) pass downward through the pile-plate joint cylinder (11) and insert Inside the prefabricated PRC pipe pile (3), the prestressed pipe (8) is provided with a prestressed steel bundle (6), and the gasket (4) is provided with prestressed pipes (8) through which the prestressed pipe (8) passes through. A hole (12), a rubber cushion (19) is filled between the joint boss (9) and the small-diameter hole. 2. An assembled pile-slab structure connection node according to claim 1, characterized in that: the height of the large-diameter hole does not exceed 1/4 of the height of the precast concrete slab (1) where it is located, and the diameter of the large-diameter hole Not less than the diameter of the pile-plate joint cylinder (11). 3. An assembled pile-slab structure connection node according to claim 2, characterized in that: the height of the pile-slab joint cylinder (11) is equal to 1 to 2 times the diameter, and the pile-slab joint cylinder (11) ) is the same as the diameter of the prefabricated PRC pipe pile (3), the height of the joint boss (9) is the same as the height of the small diameter hole, and the concrete strength grade of the prefabricated pile-to-plate joint (2) is not less than that of the prefabricated PRC Pipe pile (3) concrete strength grade. 4. An assembled pile-slab structure connection node according to claim 3, wherein the joint boss (9) and the pile-slab joint cylinder (11) are provided with joints similar to conventional pile foundations Longitudinal reinforcement (16) and circumferential spiral stirrups (17) in the inner reinforcement cage, and the circumferential spiral stirrups (17) are located outside the prestressed pipeline (8). 5. An assembled pile-plate structure connection node according to claim 4, characterized in that: the bottom of the pile-plate joint cylinder (11) and the top of the prefabricated PRC pipe pile (3) are each fixedly connected with a middle part An end plate (10) with a through hole is provided, the two end plates (10) are connected by full welding with fillet welds, a ferrule is fixed on the outer side of the end plate (10), and the end plate (10) is also provided with annular and equidistant rings. For the prestressed hole (12) through which the prestressed pipe (8) passes, the end plate (10) has a circular cross-section and the diameter is the same as that of the pile-plate joint cylinder (11). 6 . The prefabricated pile-plate structure connection node according to claim 5 , wherein the prefabricated PRC pipe pile ( 3 ) is provided with a circle 1.4-1.6 m downwards and a through hole is opened in the middle. 7 . The prestressed anchoring plate (5) is 5mm thick, and the prefabricated PRC pipe pile (3) is provided with an outer ring longitudinal reinforcement (14) of the pipe pile, and the outer ring longitudinal reinforcement of the pipe pile (14) The pipe pile stirrup (15) is fixedly connected, the prestressed anchor plate (5) is inscribed in the pipe pile outer ring longitudinal reinforcement (14), and the prestressed anchor plate (5) is connected to the pipe pile outer ring longitudinal reinforcement (14) and The pipe pile stirrups (15) are welded as a whole, and the pipe pile reinforced longitudinal reinforcement (13) is provided within the range of the upper and lower pile diameters of the prestressed anchor plate (5), and the pipe pile reinforced longitudinal reinforcement (13) penetrates through the prestressing force. The anchoring plate (5) is welded with the prestressed anchoring plate (5) around it, and the prestressed anchoring plate (5) is provided with holes for the passage of the intensified longitudinal bars and for the passage of the prestressed pipes (8) at the same distance. The prestressed hole (12) is located between the pipe pile dense longitudinal reinforcement (13) and the pipe pile outer ring longitudinal reinforcement (14). 7. An assembled pile-plate structure connection node according to claim 6, characterized in that: the outer side of the prestressed anchoring plate (5) is longitudinally fixed with a pipe pile outer ring prestressed steel bar (18), The annular prestressed reinforcing bars (18) and the outer annular longitudinal bars (14) of the pipe piles are arranged in a staggered manner along the outer side of the prestressed anchoring plate (5). ), the prestressed steel bundle (6) is sheathed with a plastic sleeve, and passes upward through the prestressed hole (12) and the prestressed pipe (8), and the top is located in the large-diameter hole, and concrete is poured in the large-diameter hole. 8. The construction method of the above-mentioned prefabricated pile-plate structure connection node is characterized in that, comprises the following steps: S1. Preliminary determination of structural materials, layout size and quantity: Preliminarily determine the pile-plate joint column according to the geometric dimensions, material parameters and superstructure load of the precast concrete slab (1) and prefabricated PRC pipe piles (3) required for the actual erection position (11) and the geometric dimensions of the joint boss (9); determine the respective quantity and arrangement of the longitudinal reinforcement (16) of the steel cage and the circumferential spiral stirrup (17) in the joint; preliminarily determine the prestressed steel required for the connection between the pile and plate The area, arrangement position and tension control force of the bundle (6); determine the size, material and position of the prestressed anchor plate (5) added inside the lower prefabricated PRC pipe pile, determine the pipe pile densified longitudinal reinforcement (13), the pipe pile The respective quantity and arrangement of the outer ring longitudinal reinforcement (14), the pipe pile stirrup (15) and the pipe pile outer ring prestressing reinforcement (18); S2. Prefabricated component stage: Prefabricated concrete slabs (1) should be prefabricated accurately with reserved holes (7), and prestressed pipes (8) should be evenly embedded in the large-diameter holes along the circumferential direction. The size of the large-diameter holes needs to be It can meet the requirements of prestressed steel bundle tensioning and anchoring space; in the process of manufacturing the prefabricated PRC pipe pile (3), in the stage of tying steel bars, the prestressed anchor plate (5) is added to the design position in the prefabricated PRC pipe pile (3). , and are welded and fixed with the outer ring longitudinal reinforcement (14), the pipe pile stirrup (15) and the outer ring prestressed steel bar (18) of the surrounding pipe pile to form a steel skeleton, and the upper and lower areas of the prestressed anchor plate (5) The addition of the pipe pile reinforced longitudinal bars (13) and stirrups forms an ordinary reinforcement reinforcement area. The pipe pile densified longitudinal bars (13) need to pass through the prestressed anchor plate (5) and be fixed by welding. The circumferential spiral stirrups (17) The spacing is tightened, and the prestressed anchor plate (5) needs to be reserved for the holes through which the longitudinal reinforcement (13) of the pipe pile passes through and the prestressed holes (12). The diameter of the holes should match the longitudinal reinforcement, and the prestressed holes (12) The diameter matches the diameter of the prestressed steel bundle (6), and the position is accurate; one end of the prestressed steel bundle (6) is anchored on the prestressed anchoring plate (5), and a plastic sleeve is sheathed, and the prestressed The other end extends vertically to the outside of the pile head of the prefabricated PRC pipe pile (3). At this time, positioning steel bars can be used to accurately position the prestressed pipe (8) to prevent deflection; at the stage of binding steel bars, all components are positioned accurately and bound and welded. After completion, the prefabricated PRC pipe piles (3) are then poured concrete and cured until the concrete reaches the design strength; the prefabricated pile-plate joints (2) can be prefabricated according to the design size, and attention should be paid to the positioning of the prestressed pipes (8) in them. accuracy; S3. The prefabricated PRC pipe piles (3) are assembled and connected with the prefabricated pile-plate joints (2): drive the prefabricated PRC pipe piles (3) of each segment into the ground to the design elevation, and complete the prefabricated PRC pipe piles of the top section and the lower section. After the prefabricated PRC pipe piles (3) are connected, the prefabricated pile-sheet joints (2) are suspended above the prefabricated PRC pipe piles (3) at the top section, and the prestressed steel bundles (6) reserved at the top are passed through the prefabricated PRC pipe piles (3). The pre-stressed pipe (8) is preset in the pile-slab joint (2), and then the pre-fabricated pile-slab joint (2) is slowly dropped and placed on the prefabricated PRC pipe pile (3), and finally the pile plate is welded with fillet welds. The end plate (10) below the joint cylinder (11) is connected with the top end plate (10) of the prefabricated PRC pipe pile (3); S4. The prefabricated pile-slab joint (2) is assembled and connected with the prefabricated concrete slab (1): the prefabricated concrete slab (1) is suspended above the prefabricated pile-slab joint (2), and sleeved over the pile-slab joint column (11) A washer (4) wraps a rubber cushion (19) around its joint boss (9), and passes the prestressed steel bundle (6) protruding from the top of the prefabricated pile-slab joint (2) through the prefabricated concrete slab (1) above ) inside the prestressed pipe (8), then slowly drop the precast concrete slab (1) and place it on the precast pile-slab joint (2), and use a rubber cushion (19) to connect the joint boss (9) with the small diameter The gaps between the holes are filled, and after the three components of the prefabricated PRC pipe pile (3), the prefabricated pile-slab joint (2), and the prefabricated concrete slab (1) at the top section are adjusted and stabilized, the top part of the prefabricated concrete slab (1) is placed The prestressed steel bundles (6) are tensioned symmetrically in batches and anchored, and the tension control force is strictly in accordance with the design value; S5. Covering: Finally, concrete is poured above the reserved holes (7) of the precast concrete slab (1) to cover the reserved holes (7). 9. The construction method of the prefabricated pile-plate structure connection node according to claim 6, wherein: the determination formula of the tension control force in the step S4 is:

Among them, σ _con is the prestressed tension control stress; σ _p is the compressive stress generated by the prestressed steel bars in the prefabricated PRC pipe pile in the section; N is the axial force borne by a single pipe pile; M is the single pipe pile Bending moment; A is the section area of the pipe pile; W is the section modulus of the pipe pile; f _tk is the standard value of the tensile strength of the concrete material of the pipe pile.

Images