CN111254815A - Self-resetting prefabricated pier structure for single-pile foundation and assembling method thereof - Google Patents
Self-resetting prefabricated pier structure for single-pile foundation and assembling method thereof Download PDFInfo
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- CN111254815A CN111254815A CN202010142156.9A CN202010142156A CN111254815A CN 111254815 A CN111254815 A CN 111254815A CN 202010142156 A CN202010142156 A CN 202010142156A CN 111254815 A CN111254815 A CN 111254815A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/02—Piers; Abutments ; Protecting same against drifting ice
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
- E02D27/12—Pile foundations
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/08—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against transmission of vibrations or movements in the foundation soil
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
Abstract
The invention discloses a self-resetting prefabricated pier structure for a single-pile foundation and an assembling method thereof, wherein the self-resetting prefabricated pier structure comprises a pile foundation, a prefabricated pile top platform, a prefabricated pier with a base and energy consumption ribs; assembling the pile foundation and the precast pile top platform by using connecting longitudinal bars; the prefabricated bridge pier is arranged in a groove at the top of the pile top platform; the energy dissipation muscle is connected precast pile top platform and pier base. The invention is constructed by using a prefabrication and assembly technology, and has short construction period and little environmental pollution. In addition, the invention realizes self-resetting by utilizing the swinging of the pier on the pile top platform, can remarkably reduce or eliminate the residual deformation of the bridge after earthquake by utilizing the yield dissipation of the energy consumption rib to input the earthquake energy of the structure, ensures the normal use of the bridge after the earthquake, can quickly recover the earthquake resistance of the bridge by replacing the energy consumption rib, and has wide applicability and positive social and scientific meanings.
Description
Technical Field
The invention belongs to the technical field of prefabricated bridge structures, and particularly relates to a self-resetting prefabricated pier structure for a single-pile foundation and an assembling method thereof.
Background
It is well known that earthquakes pose a serious threat to bridge safety. The conventional bridge usually utilizes the cracking and crushing of concrete in the plastic hinge area at the tail end of a pier and the yielding of reinforcing steel bars to dissipate the earthquake energy input into a structure, so that the bridge is prevented from being damaged and collapsed. However, the traditional earthquake-proof design method lacks attention to the using function of the bridge after the earthquake, the plastic hinge area of the pier damaged in the earthquake is possibly difficult to repair or needs to be repaired for a long time, and the pier can have larger residual displacement, so that the bridge loses the using capability, and the disaster relief work of the disaster area after the earthquake is greatly influenced. The bridge with residual displacement can also be dismantled because of being unable to be repaired or uneconomical to repair, which causes huge economic loss and brings obstacles to the recovery of the traffic function in disaster areas.
In order to achieve the purpose of rapidly recovering the normal use function of the bridge after strong earthquake, domestic and foreign scholars propose a self-resetting structure and make a plurality of attempts on the application of the self-resetting structure in the field of bridge engineering. Even if the ideal self-resetting structure undergoes larger deformation under the action of strong shock, the self-restoring force can be utilized to eliminate residual displacement, and the original use function can be restored quickly. The self-reset structure usually needs an additional energy dissipation mechanism which can be conveniently replaced after an earthquake, so that the energy dissipation capability of the structure is compensated. The existing self-resetting bridge pier structure is mainly designed aiming at a pile group foundation or an enlarged foundation, but a structural form which meets the engineering practical requirements is lacked for a single pile foundation which is used in a large amount in bridge construction. In addition, the existing self-resetting bridge pier has a complex structure and high on-site construction difficulty, and the repairability and the long-term use performance of the existing self-resetting bridge pier are still to be improved.
Under the prerequisite of guaranteeing structure safety and durability, still need to reduce the interference to current traffic at present bridge construction, improve construction safety, reduce environmental pollution, improve construction quality for construction speed reduces the life cycle cost. A plurality of practical results at home and abroad show that the prefabrication and assembly technology is an effective way for achieving the aim. Therefore, engineering technicians are dedicated to popularizing and using the prefabrication and assembly technology in future bridge construction.
Disclosure of Invention
In order to solve the problems, the invention discloses a self-resetting prefabricated bridge pier structure for a single-pile foundation and an assembling method thereof, wherein the safety of a bridge main body structure under the action of an earthquake is ensured through the swinging between a bridge pier and a pile top platform; self-reset is realized by the self-weight of the structure and the constant-load gravity of the upper part, and the earthquake energy input into the structure is dissipated by the yield of energy dissipation ribs connecting the bridge pier and the pile top platform, so that the residual displacement of the bridge after the earthquake is remarkably reduced or eliminated, and the normal use of the bridge after the earthquake is ensured; the construction quality is improved, the construction speed is accelerated and the environmental pollution is reduced by utilizing the prefabrication and assembly technology; the energy consumption rib meets the requirement of structural energy consumption, is easy to replace, is convenient for rapidly recovering the seismic performance of the bridge after strong earthquake, has wide applicability and positive social and scientific meanings, and fills the gap of the conventional single-pile foundation self-resetting bridge pier structure.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a self-resetting prefabricated assembly type bridge pier structure for a single-pile foundation comprises a bored cast-in-place pile foundation, a prefabricated pile top platform and a prefabricated bridge pier with a base; a groove is preset at the top of the precast pile top platform, and a through-length reserved hole channel I is arranged in the middle of the precast pile top platform; the connecting longitudinal bar at the top of the bored pile foundation is embedded into a prefabricated hole channel I in the middle of the pile top platform to complete the connection between the pile foundation and the pile top platform; the prefabricated bridge pier base is arranged in a groove at the top of the pile top platform; the energy consumption rib penetrates through a reserved hole channel II in the pier manufacturing base to connect the pile top platform and the pier base; and the energy dissipation ribs are detached from the prefabricated pier base through the reserved hole channel II after the earthquake, and are flexible and replaceable.
As an improvement of the invention, a grout blanket poured by early strength slurry or ultra-high performance concrete (UHPC) is arranged between the pile foundation and the precast pile top platform, the full-length reserved hole channel I is made of a steel corrugated pipe, the pile top connecting longitudinal rib is inserted into a gap behind the reserved hole channel I, and the early strength non-shrinkage grouting material or the ultra-high performance concrete (UHPC) is poured for filling.
As another improvement, the energy consumption rib is provided with a buckling-restrained sleeve, the energy consumption rib deforms in an earthquake, and the buckling-restrained sleeve can provide restraint for the energy consumption rib and restrain the energy consumption rib from buckling under pressure; an energy consumption rib threaded anchorage is pre-buried in the pile top platform, threads matched with the energy consumption rib are arranged at the bottom of the energy consumption rib, and the energy consumption rib penetrates through the reserved hole channel II and is connected into the threaded anchorage in the pile top platform through the threads; the top end of the energy consumption rib is also provided with threads, and the circular insert and the fixed steel plate, the center of which is provided with a threaded hole, are connected with the upper part of the pier base.
As another improvement of the invention, a round nest is arranged at the top of the second reserved hole channel of the prefabricated pier base, and a round insert is arranged in the round nest during assembly; threaded rods for installing and fixing steel plates are embedded around the circular pits.
In order to achieve the purpose, the invention also adopts the technical scheme that: the assembling method of the self-resetting prefabricated pier structure for the single-pile foundation comprises the following steps:
s1, after the foundation of the bored pile is built, breaking the concrete of the pile head, and straightening the exposed connecting longitudinal bars;
s2, pouring a grout blanket on the top of the pile foundation, hoisting the prefabricated pile top platform to the pile foundation, inserting the connecting longitudinal bars into the through-length reserved hole channel I in the prefabricated pile top platform, and filling gaps between the connecting longitudinal bars and the reserved hole channel I by using early-strength non-shrinkage grouting material or ultra-high performance concrete (UHPC);
s3, after the grout of the grout blanket and the grout of the pore canal filler reach the design strength, hoisting the prefabricated bridge pier to the pile top platform, and ensuring that the prefabricated bridge pier base is arranged in the groove at the top of the pile top platform;
s4, screwing the threads at the bottom ends of the energy consumption ribs into energy consumption rib thread anchors pre-embedded in the pile top platform through a reserved hole channel II in the pier base;
s5, screwing the circular insert with the threaded hole in the center to the threaded connection section at the top of the energy consumption rib, placing the circular insert in the circular nest at the top of the second reserved hole channel of the pier base, and ensuring firm contact between the circular insert and concrete on the bottom surface of the circular nest; a threaded rod pre-embedded in a pier base penetrates through a punch on the fixed steel plate, and the fixed steel plate is fastened on the round insert by using a hexagon nut;
and S6, adding a protective cover to complete assembly.
In order to achieve the purpose, the invention also adopts the technical scheme that: a self-resetting prefabricated pier structure for a single-pile foundation is prepared as opening protective cover after pier base is subjected to rotation displacement and energy dissipation rib yielding under earthquake action, dismounting fixing steel plate and circular embedded piece, screwing out yielding energy dissipation rib from screw anchor in pile top platform, screwing new energy dissipation rib into anchor, reinstalling circular embedded piece and fixing steel plate, and adding protective cover to complete restoration work.
The invention has the beneficial effects that:
(1) the construction is convenient: the prefabricated parts are used to the maximum extent, and the threaded connection and the early strength slurry are utilized to simplify the construction process, improve the construction quality, accelerate the construction speed and reduce the environmental pollution.
(2) The structure is simple: the self-restoring force is provided by the self-weight of the structure and the upper constant-load gravity, so that an additional prestressed inhaul cable is avoided, the structural reliability is improved, and the daily maintenance work of the bridge is simplified.
(3) The cost is low: the construction and repair cost is reduced by using the energy consumption ribs with relatively low price, the maintenance operation of the bridge is reduced by using the prefabricated parts with more controllable quality, the life cycle cost is reduced, and the economic efficiency is reduced.
(4) The durability is high: compared with the traditional cast-in-place concrete part, the prefabricated part has better durability; the energy dissipation ribs are subjected to rust prevention treatment, and a protective cover is additionally arranged at the top of the pier base, so that the durability of connection between the energy dissipation ribs and the pier base is ensured.
(5) Self-resetting property: the self-resetting is realized by utilizing the self weight of the structure and the upper constant load gravity, the residual deformation of the bridge structure after the earthquake is eliminated or reduced, the plastic hinge structure is different from the traditional structure, and the components except the energy consumption rib yield are not damaged under the earthquake action, so that the using function of the bridge after the earthquake is ensured.
(6) Easy repairability: the yielding energy dissipation ribs can be quickly replaced after the earthquake, the replacement process does not influence the normal use of the bridge, and the original earthquake resistant performance of the bridge can be timely recovered after the earthquake.
(7) High bearing capacity: compared with an enlarged foundation, the bored pile foundation has higher bearing capacity, so that the bored pile foundation is widely applicable to different soil body conditions and different types of bridges.
Drawings
FIG. 1 is an overall structural view of a self-restoring prefabricated pier structure for a single pile foundation according to the present invention;
fig. 2 is a structural view of a precast pile top platform according to the present invention;
FIG. 3 is a structural diagram of a prefabricated pier with a base according to the present invention;
fig. 4 is a detailed view of the connection between the energy dissipation rib and the prefabricated pier base.
List of reference numerals:
1-drilling a cast-in-place pile foundation, 2-prefabricating a pile top platform, 3-prefabricating a pier, 4-prefabricating a pier base, 5-exposing and connecting longitudinal ribs at the top of the pile foundation, 6-sitting a grout layer, 7-leading-length reserved hole channel I, 8-groove at the top of the pile top platform, 9-energy-consuming rib threaded anchorage, 10-leading-length reserved hole channel II, 11-energy-consuming ribs, 12-top circular nest of the reserved hole channel II, 13-threaded rod, 14-round insert with a threaded hole in the center, 15-fixing steel plate, 16-protective cover and 17-ground.
Detailed Description
The present invention will be further illustrated with reference to the accompanying drawings and specific embodiments, which are to be understood as merely illustrative of the invention and not as limiting the scope of the invention. It should be noted that the terms "front," "back," "left," "right," "upper" and "lower" used in the following description refer to directions in the drawings, and the terms "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.
Example 1
The self-resetting prefabricated assembly type bridge pier structure for the single-pile foundation comprises a drilling cast-in-place pile foundation 1, a prefabricated pile top platform 2 and a prefabricated bridge pier 3 with a base 4; as shown in fig. 2, a groove 8 is reserved at the top of the precast pile top platform 2, a through-length reserved hole channel I7 made of a steel corrugated pipe is arranged in the middle, the reserved hole channel I7 is annularly arranged, the position of the through-length reserved hole channel I is aligned with the connecting longitudinal rib 5 at the top of the pile foundation 1, an energy-consuming rib threaded anchorage device 9 is also pre-embedded in the precast pile top platform 2, and the threaded anchorage device 9 is annularly arranged at the outer edge of the pile top platform 2; as shown in fig. 1, a pile foundation 1 is located below a precast pile top platform 2, bears the weight of the precast pile top platform 2 and the static and dynamic load of a bridge, and a grout blanket 6 is poured between the pile foundation 1 and the precast pile top platform 2, so that the full contact between the pile foundation 1 and the precast pile top platform 2 is ensured; and the connecting longitudinal ribs 5 exposed out of the top of the pile foundation 1 are inserted into the corresponding reserved hole channels I7, and early-strength non-shrinkage grouting material or Ultra High Performance Concrete (UHPC) is poured to fill gaps between the connecting longitudinal ribs 5 and the reserved hole channels I7.
As shown in fig. 3, a through-length reserved hole channel two 10 is arranged in a prefabricated pier base 4, the reserved hole channel two 10 is annularly arranged, the position of the reserved hole channel two 10 is aligned with an energy-consuming rib threaded anchorage device 9 pre-embedded in a pile top platform 2, a round pit 12 is arranged at the top of the reserved hole channel two 10, the depth of the round pit 12 is slightly smaller than the thickness of a round insert 14 with a threaded hole in the center, and threaded rods 13 are pre-embedded around the round pit 12 and used for installing and fixing steel plates 15; the prefabricated bridge pier 3 with the base 4 is hung on the pile top platform 2, and the bridge pier base 4 is arranged in the groove 8 at the top of the pile top platform 2, so that the base 4 is ensured not to horizontally displace relative to the pile top platform 2 when swinging under the action of an earthquake;
the energy consumption rib 11 is positioned in the reserved hole channel II 10, as shown in fig. 1, the energy consumption rib 11 is provided with a buckling-preventing sleeve to provide restraint for the energy consumption rib 11 and inhibit the energy consumption rib from buckling under pressure; the energy consumption bar 11 is connected to an energy consumption bar thread anchorage device 9 pre-embedded in the pile top platform 2 through threads at the bottom of the energy consumption bar; the connection of the energy consumption rib 11 and the pier base 4 can refer to an attached drawing 4, a circular insert 14 with a threaded hole in the center is screwed to a threaded connection section at the top of the energy consumption rib 11, the circular insert is arranged in a circular nest 12 at the top of a reserved hole channel II 10 of the pier base, firm contact between the circular insert 14 and bottom concrete of the circular nest 12 is guaranteed, a threaded rod 13 pre-embedded in the pier base penetrates through a punch hole in a fixed steel plate 15, the fixed steel plate 15 is fastened on the circular insert 14 through a hexagon nut, and finally a protective cover 16 is additionally arranged to guarantee the durability of the connection of the energy consumption rib 11; the energy consumption rib 11 can be detached from the pier base 4 through the reserved hole channel II 10 and is flexible and replaceable.
Under the conditions of normal driving, wind load and frequent earthquakes, the matching surface of the pier base 4 and the pile top platform 2 has no relative displacement. Under the action of design or rare earthquake, the pier base 4 swings on the pile top platform 2, one side of the pier base 4 lifts away from the pile top platform 2, and the energy dissipation ribs 11 connected between the pier base 4 and the pile top platform 2 are stretched and yield to generate plastic deformation and dissipate earthquake input energy. After the direction of the earthquake force is reversed, the lifted pier base 4 on one side falls back to the pile top platform 2 again, the energy dissipation ribs 11 subjected to tensile plastic deformation are subjected to compression yielding, and the buckling-preventing sleeve provides restraint for the energy dissipation ribs 11 and inhibits the energy dissipation ribs from being subjected to compression buckling. In the earthquake process, only the energy consumption ribs 11 are subjected to plastic deformation, the pile foundation 1, the pile top platform 2, the pier 3 and the pier base 4 are not damaged, and the pier 3 and the pier base 4 can be subjected to self-resetting through the self-weight of the structure and the dead load gravity, so that the normal use of the bridge after the earthquake is ensured. The replacement process of the energy consumption ribs 11 does not affect the normal use of the bridge, and the original anti-seismic performance of the bridge can be recovered after the energy consumption ribs 11 are replaced. The numerical simulation research result shows that the force-displacement hysteresis relation is a typical flag shape, and the flag-shaped magnetic suspension has good self-resetting capability and stable energy consumption performance. Different from the traditional pier plastic hinge with the structure which is difficult to repair under the action of an earthquake, the pier plastic hinge has no damage to other parts except the energy consumption rib 11 after the earthquake, and has good repairability.
Example 2
The assembling method of the self-resetting prefabricated pier structure for the single-pile foundation comprises the following steps:
the preparation method comprises the following steps: when the pile top platform 2 and the pier base 4 are prefabricated, a reserved hole channel I7, an energy-consuming rib threaded anchorage device 9 and a reserved hole channel II 10 are arranged according to a design scheme strictly, and the positions of the reserved hole channel I7, the energy-consuming rib threaded anchorage device 9 and the reserved hole channel II are checked and confirmed. The pile top platform 2 and the pier base 4 are prefabricated in a matched mode, so that the contact surfaces of the pile top platform and the pier base are matched, and the position alignment of the reserved hole channel II 10 and the energy-consuming rib threaded anchorage device 9 is guaranteed. The reserved hole I7 is made of a steel corrugated pipe so as to ensure the effective transmission of internal force. And the connecting longitudinal bar 5 at the top of the pile foundation reinforcement cage is positioned by using a template, so that the position of the connecting longitudinal bar corresponds to the position of the reserved hole channel I7.
S1, after the construction of the bored pile foundation 1 is completed, pile head concrete is broken, and exposed connecting longitudinal bars 5 are straightened;
s2, pouring a grout blanket 6 on the top of the pile foundation 1, hoisting the precast pile top platform 2 to the pile foundation 1, inserting the connecting longitudinal ribs 6 into a through-length reserved hole channel I7 in the precast pile top platform, and during the hoisting process, paying attention to prevent the connecting longitudinal ribs 5 from colliding with the pile top platform 2 to cause bending, wherein the position deviation of the hoisted pile top platform 2 is ensured to be within a design allowable range; filling a gap between the connecting longitudinal bar 5 and the reserved hole channel I7 with early-strength non-shrinkage grouting material or Ultra High Performance Concrete (UHPC), wherein the grouting process needs to ensure that the slurry in the reserved hole channel I7 is filled compactly;
s3, after the grout of the grout blanket and the grout of the pore channel filling reach the design strength, hoisting the prefabricated pier 3 and the base 4 to the pile top platform 2, wherein the hoisting process is to ensure that the prefabricated pier base 4 is arranged in the groove 8 at the top of the pile top platform and the reserved pore channel II 10 corresponds to the energy-consuming rib threaded anchorage device 9; the prefabricated pier base 4 and the prefabricated pier 3 can be integrally cast and then hoisted at one time, and can also be separately cast and then hoisted and connected into a whole;
s4, screwing the threads at the bottom ends of the energy consumption ribs into the energy consumption rib thread anchors pre-embedded in the pile top platform 9 through the second reserved hole channels 10 in the pier base;
s5, screwing the circular insert 14 with the threaded hole in the center to the threaded connection section at the top of the energy consumption rib, placing the circular insert in the circular nest 12 at the top of the reserved hole channel II of the pier base, and ensuring firm contact between the circular insert 14 and concrete on the bottom surface of the circular nest; the threaded rod 13 pre-embedded in the pier base penetrates through the hole in the fixed steel plate, and the fixed steel plate 15 is fastened on the round insert 14 by using a hexagon nut;
and S6, adding the protective cover 16 to finish assembly.
The pile top platform 2, the pier base 4 and the pier 3 are all prefabricated in a factory, and work of binding reinforcing steel bars on site, building a mold and the like is avoided. The construction slurry can reach the strength of common concrete within 24 hours, thereby ensuring that the connection between the pile top platform 2 and the pile foundation 1 is completed within one day. The pier base 4 is directly placed on the pile top platform 2 and is matched with the energy consumption ribs 11 in threaded connection, so that the construction steps are simplified, the construction speed is accelerated, the construction quality is improved, and the environmental pollution is reduced. Meanwhile, energy consumption components with relatively low price are used for reducing the construction and maintenance cost, and the maintenance operation is reduced by using prefabricated parts with more controllable quality, so that the life cycle cost is reduced, and the energy-saving type building block is economical and economical.
Example 3
A self-resetting prefabricated pier structure repairing method for a single-pile foundation comprises the following steps that when a pier base undergoes rotation displacement under the action of an earthquake:
s1, opening the protective cover 16, detaching the fixed steel plate 15 and the round insert 14, and screwing the yielding energy consumption rib 11 out of the energy consumption rib threaded anchorage device 9 in the pile top platform;
s2, screwing the new energy consumption rib 11 into the energy consumption rib threaded anchorage device 9, reinstalling the circular insert 14 and the fixed steel plate 15, then installing the protective cover 16, completing the repair work, and immediately recovering the anti-seismic performance of the bridge.
The invention has no damage to other parts except the energy consumption rib yielding under the action of earthquake, thereby ensuring the using function of the bridge after the earthquake. The yielding energy dissipation ribs can be quickly replaced after the earthquake, the replacement process does not influence the normal use of the bridge, and the original earthquake resistant performance of the bridge can be timely recovered after the earthquake.
The technical means disclosed in the invention scheme are not limited to the technical means disclosed in the above embodiments, but also include the technical scheme formed by any combination of the above technical features.
Claims (5)
1. A prefabricated assembled pier structure from restoring to throne for single pile foundation, including pile foundation, precast pile top platform and have the prefabricated pier of base, its characterized in that:
the pile foundation is positioned below the precast pile top platform and bears static and dynamic loads of the bridge;
the middle part of the precast pile top platform is annularly provided with a through-length reserved hole channel I, and the position of the through-length reserved hole channel I corresponds to the connecting longitudinal bar at the top of the pile foundation; a grout blanket is poured between the pile foundation and the precast pile top platform, and connecting longitudinal bars at the top of the pile foundation are embedded into the reserved hole channels I;
the pier base is arranged in a groove at the top of the pile top platform;
the energy dissipation rib is connected with the pier base and the pile top platform through a reserved hole channel II in the pier base.
2. The self-restoring prefabricated pier structure for a mono-pile foundation of claim 1, wherein:
the reserved hole channel I is made of a steel corrugated pipe;
the sitting slurry layer is poured by early strength slurry or ultrahigh performance concrete; the gap between the connecting longitudinal bar and the reserved hole channel I is filled with early-strength non-shrinkage grouting material or ultra-high performance concrete,
energy-consuming rib threaded anchorage devices are embedded in the precast pile top platform in an annular mode; the position of a through-length reserved hole channel II in the prefabricated pier base is aligned with the energy-consuming rib threaded anchorage;
threads are arranged at two ends of the energy consumption rib, the energy consumption rib penetrates through the reserved hole channel II and is connected with an energy consumption rib thread anchorage device in the pile top platform by utilizing the bottom end threads; the top end of the energy consumption rib is connected with the upper part of the pier base through a round insert and a fixed steel plate, wherein the center of the round insert is provided with a threaded hole.
3. The self-restoring prefabricated pier structure for a single-pile foundation according to claim 2, wherein:
the top of the reserved hole channel II is provided with a round pit, and the depth of the round pit is 1-10mm smaller than the thickness of the round insert; threaded rods are embedded around the round pits;
the circular insert with the threaded hole in the center is screwed to the threaded connection section at the top of the energy consumption rib, is placed in the circular nest and is firmly contacted with concrete on the bottom surface of the circular nest; the threaded rod penetrates through the punched hole in the fixed steel plate, and the fixed steel plate is fastened on the circular insert by using the hexagon nut;
and the top of the fixed steel plate is provided with a protective cover.
4. The assembling method of the self-resetting prefabricated pier structure for the single-pile foundation is characterized by comprising the following steps of:
s1, after the foundation of the bored pile is built, breaking the concrete of the pile head, and straightening the exposed connecting longitudinal bars;
s2, pouring a grout blanket on the top of the pile foundation, hoisting the prefabricated pile top platform to the pile foundation, inserting the connecting longitudinal bars into the through-length reserved hole channel I in the prefabricated pile top platform, and filling gaps between the connecting longitudinal bars and the reserved hole channel I by using early-strength non-shrinkage grouting materials or ultra-high performance concrete;
s3, after the grout of the grout blanket and the grout of the pore canal filler reach the design strength, hoisting the prefabricated bridge pier to the pile top platform, and ensuring that the prefabricated bridge pier base is arranged in the groove at the top of the pile top platform;
s4, screwing the bottom end screw thread of the energy consumption rib into an energy consumption rib screw anchor device pre-embedded in the pile top platform through a reserved hole channel II in the pier base;
s5, screwing the circular insert with the threaded hole in the center to the threaded connection section at the top of the energy consumption rib, placing the circular insert in the circular nest at the top of the second reserved hole channel of the pier base, and ensuring firm contact between the circular insert and concrete on the bottom surface of the circular nest; a threaded rod pre-embedded in a pier base penetrates through a punch on the fixed steel plate, and the fixed steel plate is fastened on the round insert by using a hexagon nut;
and S6, adding a protective cover to complete assembly.
5. A repair method for a self-resetting prefabricated pier structure of a single-pile foundation is characterized by comprising the following steps of: and after the pier base undergoes rotational displacement and the energy dissipation ribs are buckled under the action of an earthquake, opening the protective cover, detaching the fixed steel plate and the circular insert, screwing the buckled energy dissipation ribs out of the threaded anchorage in the pile top platform, screwing the new energy dissipation ribs into the anchorage, reinstalling the circular insert and the fixed steel plate, and adding the protective cover to complete bridge repair work.
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