CN110541354B - Single-section prefabricated anti-seismic pier and construction method thereof - Google Patents

Single-section prefabricated anti-seismic pier and construction method thereof Download PDF

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CN110541354B
CN110541354B CN201910937757.6A CN201910937757A CN110541354B CN 110541354 B CN110541354 B CN 110541354B CN 201910937757 A CN201910937757 A CN 201910937757A CN 110541354 B CN110541354 B CN 110541354B
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pier
prefabricated
steel sleeve
steel
bearing platform
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CN110541354A (en
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邱文亮
汪振国
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Dalian University of Technology
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Dalian University of Technology
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    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D19/00Structural or constructional details of bridges
    • E01D19/02Piers; Abutments ; Protecting same against drifting ice
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D21/00Methods or apparatus specially adapted for erecting or assembling bridges

Abstract

The invention discloses a single-section prefabricated anti-seismic pier which comprises a cast-in-place bearing platform structure, prefabricated pier columns, non-bonding prestressed reinforcements and a ductile steel sleeve group, wherein the cast-in-place bearing platform structure is provided with a plurality of steel sleeve groups; the ductile steel sleeve is packaged on the surface of the joint of the cast-in-place cushion cap structure and the prefabricated pier stud; the non-bonding prestressed reinforcement is anchored at the bottom of the cast-in-place bearing platform structure and tensioned at the top of the prefabricated pier column so as to provide self-resetting capability for the single-section prefabricated anti-seismic pier. This prefabricated pier is in order to weaken the pier stud damage after shaking, reduces the pier residual deformation after shaking and is the access point to combine to sway mound anti-seismic performance characteristics, can improve the anti-seismic performance of prefabricated pier by a wide margin.

Description

Single-section prefabricated anti-seismic pier and construction method thereof
Technical Field
The invention belongs to the technical field of bridge structure design, and particularly relates to a single-section prefabricated anti-seismic pier and a construction method thereof.
Background
Pier column earthquake damage is the most common earthquake damage form of a bridge structure after an earthquake occurs. The bridge pier column can be divided into a cast-in-place concrete pier and a prefabricated pier according to a construction method, and the rapid development of the bridge industry makes two pier column systems more and more perfect in various aspects such as design, construction, application and the like. At present, various shock absorption and reinforcement technologies are applied to bridge pier column systems, so that a good anti-seismic effect is achieved, but meanwhile, some problems to be solved exist. The cast-in-place concrete pier mainly shows shear failure and bending collapse in the plastic hinge area under the earthquake action, although the existing earthquake-resistant technology can reduce the damage degree of the pier, the damage of the pier column cannot be thoroughly avoided, and the pier column is seriously damaged under strong earthquake or the damage in the pier is difficult to repair after the earthquake. In addition, the cast-in-place concrete pier can produce residual deformation under the action of earthquake, and the bridge can lose the traffic function due to excessive residual deformation, and can not be repaired after the earthquake.
Compared with the traditional cast-in-place concrete bridge pier, the prefabricated bridge pier system is developed later, is applied to a non-seismic area or a low-intensity area, and can be divided into two types according to different seismic performance characteristics of the bridge piers, namely 'equivalent cast-in-place' prefabricated bridge piers and 'non-equivalent cast-in-place' prefabricated bridge piers (swing piers). The 'equivalent cast-in-place' prefabricated bridge pier has the seismic performance equivalent to that of a cast-in-place concrete bridge pier by processing the joint. The swing interface is arranged between the non-equivalent cast-in-place prefabricated pier (swing pier) and the bearing platform, the swing pier and the bearing platform are connected into a whole through the cohesionless prestressed bundles, the swing pier is mainly a pressed component, the damage of the swing pier can be controlled on the swing interface, the damage of a pier main body is further avoided, the swing pier has good self-resetting capability, meanwhile, the pier is extremely suitable for application of prefabricated assembly technology, the energy consumption of the pier is poor, and the energy consumption capability of the pier is improved by adding an energy consumption device.
Compare traditional cast in situ concrete pier, prefabricated pier has that construction period is short, and pier overall quality is high, reduces a great deal of advantages such as construction interference, however, the anti-seismic performance of all kinds of prefabricated piers is different, and engineering personnel can't select suitable prefabricated pier in order to satisfy engineering antidetonation needs according to the antidetonation demand, and this makes the application of prefabricated pier in the district of shaking not extensive.
The prior art is as follows: 1. the patent document with application number 201810928354.0 discloses an anti-seismic pier of a rigid frame bridge and a construction method thereof, which is a cast-in-place concrete pier, and has no self-resetting capability after earthquake, and if the pier column has large residual deformation after strong earthquake, the later repair process is extremely difficult; meanwhile, in order to solve the problem of repairing the damaged pier, the literature mentions that a processing mode of chiseling out the damaged outer coating layer and pouring the concrete at the position has great potential safety hazard. The document aims to enhance the seismic performance of the pier in the plastic hinge region of the connection region between the pier column and the beam body and between the pier column and the bearing platform, and the plastic hinge region of the pier column structure can be transferred under the action of strong shock. The construction period is long, and the construction method is complicated. 2. The patent document with the application number of 201910595530.8 discloses an assembled anti-seismic pier, wherein horizontal dampers are arranged at sections, only transverse shock absorption is considered, vertical shock absorption is not considered, large corners can be generated between pier column sections under the action of strong shock, and concrete at the joint of the sections can be crushed due to interaction between the two sections; simultaneously, its attenuator setting is in the pier stud, and the later stage is difficult to the maintenance of attenuator to be changed and is realized. If a strong earthquake occurs, the residual deformation of the structure is too large, so that the post-earthquake repair is difficult; meanwhile, the prefabricated sections of the pier columns are complex in structure, and once the structure is damaged, the pier columns are difficult to repair.
Disclosure of Invention
In order to overcome the defects in the prior art, the application provides a single-section prefabricated anti-seismic pier and a construction method thereof. This prefabricated pier is in order to weaken the pier stud damage after shaking, reduces the pier residual deformation after shaking and is the access point to combine to sway mound anti-seismic performance characteristics, can improve the anti-seismic performance of prefabricated pier by a wide margin.
In order to achieve the purpose, the technical scheme of the application is as follows: a single-section prefabricated anti-seismic pier comprises a cast-in-place bearing platform structure, a prefabricated pier column, a non-bonding prestressed reinforcement and a ductile steel sleeve group; the ductile steel sleeve is packaged on the surface of the joint of the cast-in-place cushion cap structure and the prefabricated pier stud; the non-bonding prestressed reinforcement is anchored at the bottom of the cast-in-place bearing platform structure and tensioned at the top of the prefabricated pier column so as to provide self-resetting capability for the single-section prefabricated anti-seismic pier.
Further, the ductile steel sleeve group comprises a connecting pier outer wrapping steel sleeve, a prefabricated pier outer wrapping steel sleeve and an elastic bolt; shear keys (which can be four rows) are arranged on the inner surface of the ductile steel sleeve group, and a certain distance is reserved between every two adjacent shear keys to enable the steel bars to pass through; a plurality of bolt holes (eight bolt holes can be provided) are formed in the top of the connecting pier outer wrapping steel sleeve and the bottom of the prefabricated pier outer wrapping steel sleeve; and the elastic bolt penetrates through the corresponding bolt hole to fixedly connect the pier outer wrapping steel sleeve and the prefabricated pier outer wrapping steel sleeve.
Further, the cast-in-place bearing platform structure comprises a bearing platform and concrete filled steel tubes; the bearing platform is cast with connecting piers at the designed assembling positions of the prefabricated pier columns, and prestressed pipelines (four pipes can be embedded inside the bearing platform); the steel pipe concrete is positioned at the center of the pier and is formed by pouring high-strength concrete in a hollow steel pipe, one third of the length of the lower part of the steel pipe concrete is embedded in the bearing platform, and the prestressed pipelines are distributed on the periphery of the steel pipe concrete; the steel sleeve wrapped outside the connecting pier completely wraps the connecting pier.
Further, the prefabricated pier column comprises pier column prefabricated components; the bottom of the pier stud prefabricated part is provided with a steel pipe concrete placing space, the length of the steel pipe concrete placing space is two-thirds of the length of the steel pipe concrete, and the diameter of the steel pipe concrete placing space is slightly larger than the diameter of the steel pipe concrete; the placing space of the steel tube concrete is communicated with the outside through a grouting hole and a grout outlet, and the grout outlet is positioned above the grouting hole; pre-stressed pipelines (four can be reserved) are reserved in the pier stud prefabricated component; the steel sleeve wrapped outside the prefabricated pier is positioned at the lower part of the prefabricated pier stud, and the bottom of the steel sleeve is flush with the bottom of the prefabricated pier stud; the length and the inner diameter of the steel sleeve wrapped outside the prefabricated pier are the same as those of the steel sleeve wrapped outside the connecting pier.
The anti-seismic working principle of the single-section prefabricated anti-seismic pier is as follows: when the inertia force generated by the earthquake action acts on the bridge pier, the damage of the bridge pier can be controlled on the joint surface of the prefabricated pier column and the cast-in-place bearing platform; under the action of earthquake inertia force, the ductile steel sleeve group can play a role of restraining concrete, and also shares certain pressure for the concrete at the pressed side, and meanwhile, the elastic bolt consumes energy to dissipate earthquake energy; under the action of earthquake inertia force, the non-bonding prestressed reinforcement provides self-resetting capability for the prefabricated pier stud; the steel pipe concrete resists shearing force and bending moment generated by earthquake inertia force, increases lateral rigidity of the pier stud, and simultaneously plays a role in limiting relative displacement between the prefabricated pier stud and a cast-in-place bearing platform structure.
The application also provides a construction method of the single-section prefabricated anti-seismic pier, which comprises the following steps:
(1) constructing a cast-in-place bearing platform structure: installing a cushion cap template, placing common steel bars, pouring steel pipe concrete at the center of the pier, and wrapping the connecting pier with a steel sleeve outside to wrap the outer wall of the connecting pier; one end of the non-bonded prestressed steel bar is anchored with the fixed-end anchorage device, the fixed-end anchorage device is placed in a reserved groove of the bearing platform template, the other end of the non-bonded prestressed steel bar penetrates out of a corresponding prestressed pipeline, then concrete is poured, and the template is removed when the strength of the concrete meets the design requirement;
(2) installing the prefabricated pier stud: hoisting the prefabricated pier stud to be positioned above the bearing platform, and enabling the non-bonding prestressed reinforcement to penetrate through a prestressed pipeline in the prefabricated pier stud; and (3) lowering the prefabricated pier stud to align the bolt holes on the prefabricated pier stud and the prestressed pipeline and the ductile steel sleeve set of the cast-in-place cushion cap structure, then injecting cement mortar from the grouting hole, stopping grouting after the cement mortar overflows from the grout outlet hole, and finishing the installation of the prefabricated pier stud.
(3) Installing a non-cohesive prestressed reinforcement and ductile steel sleeve set: tensioning the top of the prefabricated pier stud without bonding prestressed reinforcements, and pouring concrete for anchoring after the tensioning is finished; and fixedly connecting the pier outer wrapping steel sleeve with the prefabricated pier outer wrapping steel sleeve by using an elastic bolt to complete the installation of the ductility steel sleeve group.
Due to the adoption of the technical scheme, the invention can obtain the following technical effects:
(1) the design is flexible: the invention aims to weaken the damage of the pier column after the earthquake and reduce the residual deformation of the pier after the earthquake, and is designed by combining the advantage of the earthquake resistance of the swinging pier. Compared with the traditional cast-in-place concrete pier, the pier column self-resetting device can realize pier column self-resetting, the pier damage can be controlled on the joint surface of the prefabricated pier and the bearing platform structure, and the damage degree of the pier column after the earthquake can be greatly reduced by utilizing the constraint and compression resistance characteristics of the steel sleeve; compare in rocking the mound, the setting of steel core concrete can greatly increase the pier stud shear and bending resistance, simultaneously, the steel sleeve that utilizes elastic bolt to connect has very big ductility, when prefabricated pier stud takes place to rock, steel core concrete and steel sleeve combined action retrain and dissipate the vibrations energy to the pier.
(2) Economical and practical: compared with the prior art, the method can greatly reduce the damage of the pier stud after the earthquake, can avoid the serious damage or overlarge residual deformation of the pier stud after the earthquake to cause the bridge to lose the traffic function, and greatly reduces the repair cost of the pier after the earthquake; in addition, the invention combines the prefabricated pier stud construction technology for construction, has small interference to the surrounding environment of the construction site and small social influence.
(3) The construction period is short: the prefabricated pier stud can be prefabricated in a factory building in advance, and can be installed after the bearing platform structure is poured, compared with a cast-in-place concrete pier, the method saves the processes of binding, pouring and maintaining the concrete on-site reinforcement of the pier stud, shortens the construction period, is simple and convenient, does not need complex operation, and further reduces the construction time.
(4) The applicability is strong: the structural form, the anti-seismic method and the construction method are not only suitable for the cylindrical pier, but also suitable for other section types of pier columns.
Drawings
Fig. 1 is a structural elevation view of a single-segment prefabricated anti-seismic pier of the invention.
Fig. 2 is a cross-sectional view taken along line a-a of fig. 1.
FIG. 3 is a structural elevation view of a cast-in-place cap structure of the present invention.
Fig. 4 is a construction elevation view of the prefabricated pier stud of the present invention.
FIG. 5 is a three dimensional view of a ductile steel sleeve set in accordance with the present invention.
Fig. 6 is a structural elevation view of the elastic bolt of the present invention.
Fig. 7 is a schematic view of the anti-seismic working principle of the single-section prefabricated anti-seismic pier.
Fig. 8 is an enlarged view at B in fig. 7.
Fig. 9 is a schematic view of construction steps of the single-section prefabricated anti-seismic pier of the invention.
The sequence numbers in the figures illustrate: 1, a cast-in-place bearing platform structure; 2, prefabricating a pier stud; 3, no bonding prestressed reinforcement; 4, a ductile steel sleeve group; 5, bearing platform; 6, concrete-filled steel tubes; 7, prestressed pipelines; 8, pier column prefabricated parts; 9, placing space of the steel pipe concrete; 10 grouting holes; 11, a slurry outlet; 12 a shear key; 13 bolt holes; 14 a screw cap; 15, a screw rod; 16 nuts; 17 an elastomeric material; 18 steel bars (main bars and stirrups); 41, wrapping a steel sleeve outside the connecting pier; 42, wrapping a steel sleeve outside the prefabricated pier; 43 resilient bolts.
Detailed Description
The embodiments of the present invention are implemented on the premise of the technical solution of the present invention, and detailed embodiments and specific operation procedures are given, but the scope of the present invention is not limited to the following embodiments.
Example 1: as shown in fig. 1 and 2, the embodiment specifically relates to a single-section prefabricated anti-seismic pier, which includes a cast-in-situ bearing platform structure 1, a prefabricated pier stud 2, a non-bonded prestressed reinforcement 3 and a ductile steel sleeve group 4; the surface of the joint of the cast-in-place cushion cap structure 1 and the prefabricated pier stud 2 is coated with a ductile steel sleeve group 4; the non-bonding prestressed reinforcement 3 is anchored at the bottom of the cast-in-place bearing platform structure 1 and is stretched at the top of the prefabricated pier stud 2 so as to provide self-resetting capability for the single-section prefabricated anti-seismic pier.
As shown in fig. 3, the cast-in-place bearing platform structure 1 comprises a bearing platform 5 and concrete-filled steel tubes 6; the bearing platform 5 pours a connecting pier at the designed assembly position of the prefabricated pier stud 2, the cross section area of the connecting pier is the same as that of the prefabricated pier stud 2, the height of the connecting pier is h, and the value of h is determined according to the length of a pier and is not less than 0.3 m; the steel pipe concrete 6 is positioned at the center of the pier and is formed by pouring high-strength concrete in a hollow steel pipe, the length of the steel pipe concrete is determined according to the length of the pier, the diameter of the pier is not less than three times that of the pier, the top surface of a connecting pier is used as a boundary, and one third of the length of the steel pipe concrete 6 is embedded into a bearing platform; the steel sleeve 41 for wrapping the connecting pier is positioned outside the connecting pier to completely wrap the connecting pier, the inner diameter of the connecting pier is the diameter of the pier, and the height of the connecting pier is the height h of the connecting pier; four prestressed pipelines 7 are pre-buried in the bearing platform 5.
As shown in fig. 2 and 4, the prefabricated pier stud 2 comprises a pier stud prefabricated part 8; the bottom of the pier stud prefabricated part 8 is provided with a placement space 9 of the concrete-filled steel tube 6, the length of the placement space is two-thirds of the length of the concrete-filled steel tube 6, and the diameter of the placement space is slightly larger than that of the concrete-filled steel tube 6; the placing space 9 of the steel tube concrete 6 is communicated with the outside through a grouting hole 10 and a grout outlet 11; four prestressed pipelines 7 are reserved in the pier stud prefabricated part 8; the prefabricated pier steel-encased sleeve 42 is positioned at the lower part of the prefabricated pier stud 2, the bottom of the prefabricated pier steel-encased sleeve is flush with the bottom of the prefabricated pier stud 2, and the length and the inner diameter of the prefabricated pier steel-encased sleeve 42 are the same as those of the connecting pier steel-encased sleeve 41.
As shown in fig. 2, 5 and 6, the ductile steel sleeve set 4 includes a connecting pier outer sheath steel sleeve 41, a prefabricated pier outer sheath steel sleeve 42 and an elastic bolt 43; four rows of shear keys 12 are arranged on the inner surface of the ductile steel sleeve group 4, and enough distance is reserved between every two shear keys 12 to enable the steel bars 18 to pass through; eight bolt holes 13 are formed in the joint surface of the cast-in-place cushion cap structure 1 and the prefabricated pier stud 2 of the ductile steel sleeve group 4; the elastic bolt 43 is used for fixing the two outer steel sleeve 41 and 42, the elastic bolt comprises a nut 14, a screw 15, a nut 16 and an elastic material 17, the nut 14 is arranged at the top end of the screw 15, the nut 16 is connected to the lower portion of the screw 15, and the elastic material 17 is sleeved on the upper portion of the screw 15.
Example 2: as shown in fig. 7 and 8, the embodiment specifically relates to an anti-seismic working principle of a single-segment prefabricated anti-seismic pier, which is composed of the following parts:
(1) when the inertia force generated by the earthquake acts on the pier, the damage of the pier can be controlled on the joint surface of the prefabricated pier column and the cast-in-place bearing platform.
(2) Under the action of earthquake inertia force, the prefabricated pier stud 2 swings, concrete on one side of a joint surface is pressed, at the moment, the ductile steel sleeve group 4 can play a role of restraining the concrete and prevent the concrete from being crushed, and meanwhile, the two outer-coated steel sleeves 41 and 42 are also extruded at the position and can share certain pressure for the concrete on the side; the concrete on the other side is far away from each other, and the elastic bolt 43 on the ductile steel sleeve group 4 is deformed under pressure, so that the relative motion of the concrete on the other side is restrained, and the function of dissipating seismic energy is also achieved.
(3) Under the action of earthquake inertia force, the prefabricated pier stud 2 swings, the cohesionless prestressed reinforcement 3 deviates from the initial position, and the pre-tensioning stress in the prefabricated pier stud can force the prefabricated pier stud to return to the initial position, so that the self-resetting effect of the prefabricated pier stud 2 is achieved.
(4) The concrete-filled steel tube 6 is mainly used for resisting shearing force and bending moment generated by earthquake inertia force, increasing the lateral rigidity of the pier column and simultaneously playing a role in limiting the relative displacement between the prefabricated pier column 2 and the cast-in-place bearing platform structure 1.
Example 3: as shown in fig. 9, the embodiment specifically relates to a construction method of a single-section prefabricated anti-seismic pier, which comprises the following steps:
(1) and constructing a cast-in-place bearing platform structure 1. Installing a bearing platform template, placing common steel bars, pouring concrete filled steel tubes 6, placing the concrete filled steel tubes 6 and steel sleeves 41 wrapping the connecting piers at designed positions and fixing; 3 one end of non-cohesive prestressed reinforcement and the anchor of fixed end anchor, place the fixed end anchor in cushion cap template reservation notch, the 3 other ends of non-cohesive prestressed reinforcement wear out prestressed pipe 7, and prestressed pipe 7 is fixed according to the design position, later concreting, wait to carry out the form removal when the concrete strength reaches the designing requirement.
(2) And (5) mounting the prefabricated pier stud 2. Prefabricating a pier column structure according to a design drawing, namely prefabricating a pier column 2, transporting the pier column to a construction site, hoisting the pier column to be positioned above a bearing platform 5, and penetrating a non-bonding prestressed reinforcement 3 through a prestressed pipeline 7 in the prefabricated pier column 2; and (3) lowering the prefabricated pier stud 2, aligning the prefabricated pier stud 2 with the prestressed pipeline 7 of the cast-in-place pile cap structure 1 and the bolt hole 13 in the ductile steel sleeve 4, then injecting cement mortar from the grouting hole 10, stopping grouting after the grout outlet hole 11 overflows the cement mortar, and completing the installation of the prefabricated pier stud 2.
(3) The non-bonding prestressed reinforcement 3 and the ductile steel sleeve group 4 are installed. Tensioning the top of the pier stud without bonding prestressed reinforcement 3 according to the design requirement, and pouring concrete for sealing the anchor after the tensioning is finished; the two steel jacket sleeves 41 and 42 are fixed by the elastic bolts 43, and the assembly of the ductile steel sleeve group 4 is completed.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, it should be noted that, for those skilled in the art, many modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims (3)

1. A single-section prefabricated anti-seismic pier is characterized by comprising a cast-in-place bearing platform structure, prefabricated pier columns, non-bonding prestressed reinforcements and a ductile steel sleeve group; the ductile steel sleeve is packaged on the surface of the joint of the cast-in-place cushion cap structure and the prefabricated pier stud; the non-cohesive prestressed reinforcement is anchored at the bottom of the cast-in-place bearing platform structure and is stretched at the top of the prefabricated pier stud;
the ductile steel sleeve group comprises a connecting pier outer wrapping steel sleeve, a prefabricated pier outer wrapping steel sleeve and an elastic bolt; shear keys are arranged on the inner surface of the ductile steel sleeve group, and a certain distance is reserved between every two adjacent shear keys to enable the steel bars to pass through; a plurality of bolt holes are formed in the top of the connecting pier outer wrapping steel sleeve and the bottom of the prefabricated pier outer wrapping steel sleeve; the elastic bolt penetrates through the corresponding bolt hole to fixedly connect the pier outer wrapping steel sleeve and the prefabricated pier outer wrapping steel sleeve;
the cast-in-place bearing platform structure comprises a bearing platform and concrete filled steel tubes; the bearing platform is cast with a connecting pier at the designed assembling position of the prefabricated pier stud, and a prestressed pipeline is pre-embedded in the bearing platform; the steel pipe concrete is positioned at the center of the pier and is formed by pouring high-strength concrete in a hollow steel pipe, one third of the length of the lower part of the steel pipe concrete is embedded in the bearing platform, and the prestressed pipelines are distributed on the periphery of the steel pipe concrete; the steel sleeve wrapped outside the connecting pier completely wraps the connecting pier.
2. The single-section prefabricated earthquake-resistant pier is characterized in that the prefabricated pier column comprises a pier column prefabricated component; the bottom of the pier stud prefabricated part is provided with a steel pipe concrete placing space, the length of the steel pipe concrete placing space is two-thirds of the length of the steel pipe concrete, and the diameter of the steel pipe concrete placing space is slightly larger than the diameter of the steel pipe concrete; the placing space of the steel tube concrete is communicated with the outside through a grouting hole and a grout outlet, and the grout outlet is positioned above the grouting hole; a prestressed pipeline is reserved in the pier stud prefabricated component; the steel sleeve wrapped outside the prefabricated pier is positioned at the lower part of the prefabricated pier stud, and the bottom of the steel sleeve is flush with the bottom of the prefabricated pier stud; the length and the inner diameter of the steel sleeve wrapped outside the prefabricated pier are the same as those of the steel sleeve wrapped outside the connecting pier.
3. A construction method of a single-segment precast seismic pier according to claim 1 or 2, comprising the steps of:
(1) constructing a cast-in-place bearing platform structure: installing a bearing platform template, placing a steel bar, pouring steel pipe concrete at the center of the pier, placing the steel pipe concrete and a steel sleeve wrapping the connecting pier at a designed position and fixing; one end of the non-bonded prestressed steel bar is anchored with the fixed-end anchorage device, the fixed-end anchorage device is placed in a reserved groove of the bearing platform template, the other end of the non-bonded prestressed steel bar penetrates out of a corresponding prestressed pipeline, then concrete is poured, and the template is removed when the strength of the concrete meets the design requirement;
(2) installing the prefabricated pier stud: hoisting the prefabricated pier stud to be positioned above the bearing platform, and enabling the non-bonding prestressed reinforcement to penetrate through a prestressed pipeline in the prefabricated pier stud; lowering the prefabricated pier stud to align the bolt holes of the prefabricated pier stud and the prestressed pipeline and the ductile steel sleeve set of the cast-in-place cushion cap structure, then injecting cement mortar from the grouting hole, stopping grouting after the cement mortar overflows from the grout outlet hole, and finishing the installation of the prefabricated pier stud;
(3) installing a non-cohesive prestressed reinforcement and ductile steel sleeve set: tensioning the top of the prefabricated pier stud without bonding prestressed reinforcements, and pouring concrete for anchoring after the tensioning is finished; and fixedly connecting the pier outer wrapping steel sleeve with the prefabricated pier outer wrapping steel sleeve by using an elastic bolt to complete the installation of the ductility steel sleeve group.
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CN112982829B (en) * 2021-03-04 2022-07-19 北京工业大学 Assembled ECC-RC mixed column connected by grouting sleeve
CN114000416A (en) * 2021-11-04 2022-02-01 福州大学 Segment-replaceable prefabricated assembled mixed pier and construction method thereof

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