CN113668368B - Plastic hinge area enlarged section assembled type swing pier and construction method thereof - Google Patents
Plastic hinge area enlarged section assembled type swing pier and construction method thereof Download PDFInfo
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- CN113668368B CN113668368B CN202111055134.XA CN202111055134A CN113668368B CN 113668368 B CN113668368 B CN 113668368B CN 202111055134 A CN202111055134 A CN 202111055134A CN 113668368 B CN113668368 B CN 113668368B
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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
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/04—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means
- F16F15/08—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means with rubber springs ; with springs made of rubber and metal
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
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Abstract
The invention relates to an assembly type swing pier with an enlarged cross section in a plastic hinge area and a construction method thereof, wherein the assembly type swing pier comprises square prefabricated pier columns and bearing platforms with unequal cross sections; the prefabricated spliced section of the structure adopts dry joint splicing, namely the pier bottom section is an enlarged section in a plastic hinge fragile area at the pier bottom, energy-consuming steel bar set PVC reserved pore canal is arranged on four sides of the enlarged section, the prefabricated spliced pier bottom section and the bearing platform are anchored and spliced through unbonded energy-consuming steel bars and prestressed bars, and the pier bottom section and the upper section are connected in an unbonded mode through the prestressed bars. An annular rubber cushion layer is arranged at the contact surface between the enlarged part of the bridge pier bottom segment and the bearing platform. The invention can ensure that the bridge pier has good energy consumption capability under the earthquake action, can effectively reduce the severe crushing of concrete in the plastic hinge area of the bottom section, and can realize the rapid repair of the bridge pier by replacing unbonded energy consumption steel bars after the earthquake.
Description
Technical Field
The invention relates to an assembly type swing pier with an enlarged cross section in a plastic hinge area and a construction method thereof, and belongs to the technical field of prefabricated bridge structures.
Background
In recent years, earthquake frequently occurs in China, and earthquake disasters form a serious threat to bridge safety. Conventional bridges typically utilize cracking and crushing of concrete at the end of the bridge pier in the plastic hinge region and yielding of the steel reinforcement to dissipate the seismic energy input into the structure. The bridge pier is used as an important component of a bridge structure, once damaged, the stability and normal use function of the bridge can be seriously affected, so that the anti-seismic performance of the bridge pier is an important factor affecting the safety of the whole bridge structure. With the development of bridge structures, the traditional anti-seismic design method lacks attention on the use function of the bridge after earthquake, the damaged pier plastic hinge area in the earthquake can be difficult to repair or needs to be repaired for a long time, the bridge with serious damage after earthquake can be removed due to incapability of repairing or uneconomical repair, huge economic loss is caused, and the recovery of traffic functions in disaster areas is hindered.
In order to achieve the purpose of quickly recovering the normal use function of the bridge after strong earthquake, the application of the self-resetting swing pier structure in the field of bridge engineering is focused by a plurality of students. Even if the self-resetting swinging structure is subjected to larger deformation under the action of strong earthquake, the swinging of the structure can be utilized to dissipate earthquake energy, and the self-restoring force of the structure can eliminate residual displacement and restore the original use function of the structure through quick restoration. However, the energy consumption capability of the swing structure is poor due to small damage, so the swing structure generally needs to be additionally provided with an energy consumption device which can be conveniently replaced after earthquake, and the energy consumption capability of the swing structure is further compensated. The existing swing pier has complex structure, high field construction difficulty, difficult replacement of energy consumption devices, repairability and long-term use performance, and the like.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides an assembly type swing pier with an enlarged section in a plastic hinge area and a construction method thereof, which are used for solving the problems of self-resetting, energy consumption and quick recovery of the seismic performance of a bridge after strong earthquake.
In order to solve the problems, the invention adopts the following technical scheme:
the plastic hinge area enlarged section assembled type swinging pier comprises a bearing platform, wherein a prefabricated assembly pier bottom section and a prefabricated assembly pier upper section are sequentially arranged on the bearing platform; a rubber cushion layer is arranged between the bearing platform and the bottom section of the prefabricated assembly pier; the bottom section of the prefabricated spliced pier is in a convex shape, and comprises an enlarged section of a plastic hinge area of the bottom section of the prefabricated spliced pier and an upper section of the middle section of the bottom section of the prefabricated spliced pier; the upper section of the prefabricated assembly pier is inverted convex; the PVC reserved pore canal is vertically and correspondingly arranged in the middle of the bearing platform, the upper section of the prefabricated spliced pier bottom section and the middle of the upper section of the prefabricated spliced pier and is used for penetrating a prestressed reinforcement, so that the bearing platform, the prefabricated spliced pier bottom section and the upper section of the prefabricated spliced pier are connected into a whole in an unbonded anchoring manner, and the bottom and the top of the prestressed reinforcement are respectively provided with a prestressed reinforcement fixed end anchor and a prestressed reinforcement tensioning end anchor; in addition, a plurality of PVC reserved holes are correspondingly formed in the expansion section of the plastic hinge region of the bottom section of the prefabricated spliced pier and the bearing platform, and are used for penetrating energy-consuming steel bar sets, so that the expansion section of the plastic hinge region of the bottom section of the prefabricated spliced pier and the bearing platform are connected into a whole without bonding, and the top and the bottom of the energy-consuming steel bar sets are respectively provided with a top nut of the energy-consuming steel bar set and a self-locking one-way bolt anchoring end; grooves are formed in the bottom of the bearing platform and the top of the upper section of the prefabricated assembly pier, and a first square steel backing plate and a second square steel backing plate are respectively arranged in the grooves; the prestress steel bar fixed end anchor and the prestress steel bar tensioning end anchor are respectively arranged at the outer sides of the first square steel backing plate and the second square steel backing plate and are used for tensioning and anchoring through the jack; the top of the enlarged section of the plastic hinge area of the bottom section of the prefabricated spliced pier is also paved with an annular steel backing plate, and the top nuts of the energy-consumption steel bar sets are fixed on the annular steel backing plate in a torsion mode.
Further, the plastic hinge area expansion section size of the bottom section of the prefabricated spliced pier is larger than the upper section size of the bottom section of the middle prefabricated spliced pier, and the upper section size of the bottom section of the middle prefabricated spliced pier is equal to the bottom size of the upper section of the prefabricated spliced pier.
Further, a protective cover is arranged at the top of the plastic hinge area of the bottom section of the prefabricated spliced pier for preventing rainwater from penetrating.
Further, the protective cover is in a frustum shape, and the middle of the protective cover is sleeved on the upper section of the bottom section of the prefabricated assembly pier.
Further, cross sections of the bearing platform, the prefabricated spliced pier bottom section and the prefabricated spliced pier upper section are square.
Further, the rubber cushion layer is annular, the annular area of the rubber cushion layer is the same as the area of the enlarged section of the plastic hinge area of the bottom section of the prefabricated spliced pier, the rubber cushion layer is paved at the contact surface of the bearing platform and the enlarged section of the plastic hinge area of the bottom section of the prefabricated spliced pier, and the rubber cushion layer is used for reducing the contact rigidity of the bottom of the pier, so that when the pier swings under the strong earthquake effect, the local damage of the concrete of the pier at the bottom can be reduced, and the earthquake energy effect of the dissipation part is achieved.
Further, the thicknesses of the first square steel backing plate, the annular steel backing plate and the second square steel backing plate are 5-20mm, and the first square steel backing plate, the annular steel backing plate and the second square steel backing plate are used for preventing the damage of the concrete contact surface of the assembly member in the anchoring process.
Further, the sizes of the first square steel backing plate and the second square steel backing plate are respectively the same as the sizes of the grooves at the bottom of the bearing platform and the top of the prefabricated assembly pier upper section.
Further, the PVC reserved pore canals and the energy-consumption reinforcing steel bar sets penetrating through the PVC reserved pore canals are arranged at equal intervals and symmetrically.
The construction method of the plastic hinge area enlarged section assembled type swinging pier comprises the following steps:
step one: and (3) construction of a bearing platform: binding bearing platform steel bars to form a steel bar net, binding local encryption steel bars, fixing a first square steel backing plate at the bottom groove of the bearing platform according to design requirements, embedding PVC pipelines in PVC reserved pore channels, ensuring the positions of the energy-consuming steel bar groups, the first square steel backing plate and the PVC pipelines to be correct, and pouring bearing platform concrete;
step two: prefabricating a pier body: the method comprises the steps that pouring of a prefabricated assembly pier bottom section and a prefabricated assembly pier upper section is completed in a component processing field, the prefabricated assembly pier bottom section is designed into a convex shape, a plastic hinge area of the prefabricated assembly pier bottom section is enlarged in cross section, a PVC reserved pore canal is arranged at the position of the upper section of the prefabricated assembly pier bottom section, and the center of the prefabricated assembly pier upper section is provided with the PVC reserved pore canal;
step three: hoisting the prefabricated spliced pier bottom section and the prefabricated spliced pier upper section: the method comprises the steps of installing a rubber cushion layer at a designated position on the top surface of a bearing platform, installing a bottom section of a prefabricated assembly pier at an aligned position on the bearing platform, hoisting an upper section of the prefabricated assembly pier to the bottom section of the prefabricated assembly pier, paving an annular steel backing plate at the upper position of a plastic hinge area enlarged section of the bottom section of the prefabricated assembly pier, paving a second square steel backing plate at a groove at the top of the upper section of the prefabricated assembly pier, and ensuring that all reserved PVC pore channels of the whole prefabricated assembly structure and openings of the corresponding steel backing plates are on the same vertical line in the hoisting process;
step four: connecting prefabricated spliced pier segments: connecting a prefabricated assembly pier body and a bearing platform through prestressed reinforcement anchoring, wherein the prestressed reinforcement passes through the PVC reserved pore canal, a prestressed reinforcement fixed end anchorage is installed at a groove at the bottom of the bearing platform, a prestressed reinforcement stretching end anchorage is installed on the second square steel backing plate paved at the top end of the upper section of the prefabricated assembly pier, and stretching and anchoring of the prestressed reinforcement are implemented by using a jack; the energy-consuming steel bar sets are anchored and installed through PVC reserved pore canals arranged around the enlarged section of the plastic hinge area of the bottom section of the prefabricated spliced pier, the bottom end of the energy-consuming steel bar sets is fixed at the groove at the bottom of the bearing platform, self-locking one-way bolts are adopted for anchoring the anchoring ends, and the top ends of the energy-consuming steel bar sets are twisted and fixed on the annular steel backing plates paved on the enlarged section of the plastic hinge area of the bottom section of the prefabricated spliced pier by using nuts at the top ends of the energy-consuming steel bar sets;
step five: after the connection construction among the bottom section of the prefabricated spliced pier, the upper section of the prefabricated spliced pier and the bearing platform is completed, a protective cover is additionally arranged at the top end of the energy-consuming steel bar set, and finally the integral installation of the plastic hinge area expansion section fabricated swing pier is completed.
The invention has the following technical effects:
1) The construction is simple and convenient: the prefabricated assembly structural component is used, the prefabricated assembly pier components are connected in a connecting mode by adopting a dry joint, the prefabricated assembly pier components are connected into a whole through the prestressed rib group, the pouring connection of the prefabricated assembly components is not needed on a construction site, the construction process is simple, the construction quality is improved, the construction speed is accelerated, and the environmental pollution is reduced.
2) The cost is saved: the energy-consumption steel bar with relatively low price can reduce the construction and repair cost, and the prefabricated assembly pier component is simple in design and installation process, so that bridge maintenance operation is reduced, and the installation and repair cost is reduced.
3) High durability: compared with the traditional cast-in-place concrete component, the prefabricated assembly pier component has better durability; the energy-consuming steel bars are subjected to rust prevention treatment, and a protective cover is additionally arranged at the top of the energy-consuming steel bar set to prevent rainwater from penetrating and ensure the durability of the energy-consuming steel bars in the use process.
4) Self-reset: the invention discloses a bridge post-earthquake use function, which is characterized in that a bridge structure is self-restored after earthquake action by utilizing tension force of prestressed reinforcement, self-weight of the structure and secondary constant load, so that residual deformation of the bridge structure after earthquake is eliminated or reduced, an annular rubber cushion layer is paved between an enlarged part of a plastic hinge area of a precast spliced pier bottom section and a bearing platform, contact rigidity of the pier bottom can be effectively reduced, the pier swings and dissipates earthquake energy, local damage of concrete at the pier bottom is reduced, and yield of energy-consuming reinforcement can dissipate most earthquake energy.
5) Easy repairability: when an earthquake happens, the yielding energy-consuming steel bars can be quickly replaced after the earthquake, the protective cover is opened, the electric spark machine is utilized to take out the energy-consuming steel bar groups damaged by yielding in the PVC pipe, the new energy-consuming steel bars are installed, the normal use of the bridge is not influenced in the replacement process, and the original earthquake resistance of the bridge is recovered in time after the earthquake.
Drawings
For a clearer description of the solution of the invention, the following brief description of the drawings is given for the required drawings of the solution:
FIG. 1 is a front view of an assembled swing pier with an enlarged cross section of a plastic hinge area according to the present invention;
FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;
FIG. 3 is a plan view of the platform according to the present invention;
FIG. 4 is a plan view of a prefabricated bottom pier segment in accordance with the present invention;
fig. 5 is a plan view of a prefabricated upper pier segment according to the present invention.
Detailed Description
The invention will be further described with reference to fig. 1-5.
As shown in fig. 1-5, the plastic hinge area enlarged section fabricated swing pier comprises a bearing platform 1, wherein a prefabricated assembly pier bottom section 3 and a prefabricated assembly pier upper section 4 are sequentially arranged on the bearing platform 1. A rubber cushion layer 2 is arranged between the bearing platform 1 and the precast spliced pier bottom segment 3. The prefabricated assembly pier bottom section 3 is in a convex shape and comprises an enlarged section 3-1 of a plastic hinge area of the prefabricated assembly pier bottom section at the bottom and an upper section 3-2 of the prefabricated assembly pier bottom section in the middle. The prefabricated assembly pier upper section 4 is inverted convex. The PVC reserved duct 7 is vertically and correspondingly arranged in the middle of the bearing platform 1, the precast spliced pier bottom section upper section 3-2 in the middle of the precast spliced pier bottom section 3 and the precast spliced pier upper section 4 and is used for penetrating the prestressed reinforcement 5 to connect the bearing platform 1, the precast spliced pier bottom section 3 and the precast spliced pier upper section 4 into a whole in an unbonded anchoring manner, and the bottom and the top of the prestressed reinforcement 5 are respectively provided with the prestressed reinforcement fixed end anchorage 5-1 and the prestressed reinforcement tensioning end anchorage 5-2. In addition, a plurality of PVC reserved holes 7 are correspondingly formed in the plastic hinge area expanded section 3-1 of the prefabricated assembly pier bottom section at the bottom of the prefabricated assembly pier bottom section 3 and the bearing platform 1, and are used for penetrating the energy consumption steel bar group 6, so that the plastic hinge area expanded section 3-1 of the prefabricated assembly pier bottom section and the bearing platform 1 are integrally connected without bonding, and the top and the bottom of the energy consumption steel bar group 6 are respectively provided with an energy consumption steel bar group top end nut 6-1 and a self-locking one-way bolt anchoring end 6-2. In this embodiment, the PVC reserved tunnels 7 and the energy-dissipating reinforcing steel sets 6 penetrating therein are installed at equal intervals and symmetrically.
Grooves are formed in the bottom of the bearing platform 1 and the top of the prefabricated assembly pier upper section 4, and a first square steel backing plate 8-1 and a second square steel backing plate 8-3 are respectively arranged in the grooves. The prestressed reinforcement fixed end anchorage 5-1 and the prestressed reinforcement tensioning end anchorage 5-2 are respectively arranged at the outer sides of the first square steel backing plate 8-1 and the second square steel backing plate 8-3 and are used for tensioning and anchoring through a jack. The top of the plastic hinge area enlarged section 3-1 of the bottom section of the prefabricated assembly pier is also paved with an annular steel backing plate 8-2, and the top nuts 6-1 of the energy-consumption reinforcing steel bar groups are fixed on the annular steel backing plate 8-2 in a twisting manner. The thicknesses of the first square steel backing plate 8-1, the annular steel backing plate 8-2 and the second square steel backing plate 8-3 are 5-20mm, and the first square steel backing plate, the annular steel backing plate and the second square steel backing plate are used for preventing the damage of the concrete contact surface of the assembly member in the anchoring process. In addition, the dimensions of the first square steel backing plate 8-1 and the second square steel backing plate 8-3 are respectively the same as the dimensions of the grooves at the bottom of the bearing platform 1 and the top of the prefabricated assembly pier upper section 4.
As shown in fig. 4, the enlarged section 3-1 of the plastic hinge area of the bottom section of the prefabricated spliced pier is larger than the upper section 3-2 of the bottom section of the middle prefabricated spliced pier. The size of the upper section 3-2 of the middle prefabricated spliced pier bottom section is equal to the size of the bottom of the upper section 4 of the prefabricated spliced pier, the prefabricated spliced pier bottom section 3 is hoisted to enable the PVC reserved pore canal 7 of the prefabricated spliced pier bottom section to be in the same straight line with the reserved pore canal 7 of the bearing platform 1 and the prefabricated spliced pier bottom section 3, the prestressed reinforcement 5 is guaranteed to be capable of realizing unbonded anchoring connection through the reserved PVC reserved pore canal 7 without barriers, and all the prefabricated spliced pier sections are connected into an integral structure.
As shown in fig. 1, a protective cover 9 is further arranged at the top of the plastic hinge area enlarged section 3-1 of the bottom section of the prefabricated assembly pier for preventing rainwater from penetrating. The protective cover 9 is in a frustum shape, and is sleeved on the upper section 3-2 of the prefabricated spliced pier bottom section at the middle.
As shown in fig. 2-5, the cross sections of the bearing platform 1, the prefabricated assembly pier bottom section 3 and the prefabricated assembly pier upper section 4 are square. The rubber cushion layer 2 is annular, the annular area of the rubber cushion layer 2 is the same as the area of the enlarged section 3-1 of the plastic hinge area of the bottom section of the prefabricated assembly pier, the rubber cushion layer 2 is paved at the contact surface of the enlarged section 3-1 of the plastic hinge area of the bottom section of the bearing platform 1 and the prefabricated assembly pier, and is used for reducing the contact rigidity of the bottom of the pier, and when the pier swings under the strong earthquake effect, the local damage of the concrete of the bottom pier can be reduced, so that the earthquake energy of a part is dissipated.
Working principle:
under normal use state, the section of the plastic hinge area at the bottom of the prefabricated assembly pier bottom section 3 is enlarged, so that the rigidity of the bridge structure under normal use state can be ensured, the bridge can be prevented from swinging under the condition of slight disturbance due to the self weight of the upper structure and the constraint force of the prestressed reinforcement 5, and the stability of the pier is maintained.
When the small earthquake occurs, the pre-stressed steel bars 5 are connected with the swing structure of the prefabricated assembly bridge pier into a whole through unbonded connection, so that the integrity of the bridge pier is ensured, and the self weight of the upper structure enables the bridge structure to be kept stable.
When the middle and large earthquake occurs, the pier structure can swing under the action of the earthquake force because the bearing platform 1, the prefabricated assembly pier bottom section 3 and the prefabricated assembly pier upper section 4 are connected by dry joints. The rubber cushion layer 2 is paved at the contact surface of the expansion section 3-1 of the plastic hinge area of the precast spliced pier bottom section and the bearing platform 1, is in an annular design, reduces the contact rigidity of the pier bottom, enables the pier to swing better, extrudes the rubber cushion layer 2 at the bottom end of the precast spliced pier bottom section 3 in the pier swinging process, slows down the local destruction of the concrete of the pier bottom section, and when the pier inclines, the energy-consuming steel bar group 6 connecting the bearing platform 1 and the precast spliced pier bottom section 3 plays a role in dissipating most of earthquake energy. The structure has stronger self-resetting capability due to the gravity of the bridge superstructure and the restoring force provided by the prestressed reinforcement 5. Due to the connection effect of the prestressed reinforcement 5, the swing amplitude of the structure is controllable, and meanwhile, the energy consumption and shock absorption purposes are realized through the swinging of the bridge pier. After earthquake, the energy-consumption steel bar set 6 after yielding can be replaced quickly, so that the bridge is guaranteed to recover to the normal use state.
The construction method of the plastic hinge area enlarged section assembled type swinging pier comprises the following steps:
step one: and (3) construction of a bearing platform 1: binding reinforcing steel bars of the bearing platform 1 to form a reinforcing steel bar net, binding local encryption reinforcing steel bars, fixing the first square steel backing plate 8-1 according to design requirements on the bottom groove of the bearing platform 1, embedding PVC pipelines in the PVC reserved pore canal 7, ensuring the positions of the energy-consuming reinforcing steel bar group 6, the first square steel backing plate 8-1 and the PVC pipelines to be correct, and pouring concrete of the bearing platform 1.
Step two: prefabricating a pier body: and (3) pouring the bottom section 3 of the prefabricated spliced pier and the upper section 4 of the prefabricated spliced pier in a component processing field, designing the bottom section 3 of the prefabricated spliced pier into a convex shape, expanding the section 3-1 of the plastic hinge area of the bottom section of the prefabricated spliced pier and arranging a PVC reserved duct 7 at the position of the section 3-2 of the upper section of the bottom section of the prefabricated spliced pier, and arranging the PVC reserved duct 7 at the center of the upper section 4 of the prefabricated spliced pier.
Step three: hoisting the prefabricated spliced pier bottom section 3 and the prefabricated spliced pier upper section 4: the method comprises the steps of mounting a rubber cushion layer 2 on a designated position on the top surface of a bearing platform 1, mounting a prefabricated assembly pier bottom section 3 on the bearing platform 1 in an aligned position, hoisting a prefabricated assembly pier upper section 4 on the prefabricated assembly pier bottom section 3, paving an annular steel backing plate 8-2 at the upper position of a plastic hinge area enlarged section 3-1 of the prefabricated assembly pier bottom section, paving a second square steel backing plate 8-3 at the groove position on the top of the prefabricated assembly pier upper section 4, and ensuring that all reserved PVC reserved pore channels 7 of the integral prefabricated assembly structure and openings of corresponding steel backing plates are on the same vertical line in the hoisting process.
Step four: connecting prefabricated spliced pier segments: the prefabricated assembly pier body is connected with a bearing platform through the anchoring of the prestressed reinforcement 5, the prestressed reinforcement 5 passes through a PVC reserved pore channel 7, a prestressed reinforcement fixed end anchor 5-1 is installed at a groove at the bottom of the bearing platform 1, a prestressed reinforcement tensioning end anchor 5-2 is installed on a second square steel backing plate 8-3 paved at the top end of the upper section 4 of the prefabricated assembly pier, and the tensioning and anchoring of the prestressed reinforcement 5 are implemented by using a jack. The energy-consumption steel bar set 6 completes anchoring installation through PVC reserved pore canal 7 arranged around the expansion section 3-1 of the plastic hinge area of the segment at the bottom of the prefabricated assembly pier, the bottom end of the energy-consumption steel bar set is fixed at the groove at the bottom of the bearing platform 1, the self-locking unidirectional bolt anchoring end 6-2 is adopted for anchoring, and the top end of the energy-consumption steel bar set is twisted and fixed on an annular steel backing plate 8-2 paved on the expansion section 3-1 of the plastic hinge area of the segment at the bottom of the prefabricated assembly pier by using a nut 6-1 at the top end of the energy-consumption steel bar set.
Step five: after the connection construction among the prefabricated assembly pier bottom segment 3, the prefabricated assembly pier upper segment 4 and the bearing platform 1 is completed, a protective cover 9 is additionally arranged at the top end of the energy-consumption reinforcing steel bar group 6, and finally the integral installation of the plastic hinge area expansion section fabricated swing pier is completed.
In view of the foregoing, it will be appreciated that in the embodiments of the invention described above, those skilled in the art will appreciate that the foregoing embodiments are illustrative and that the present invention is not to be construed as limited thereto, and that various changes, modifications, substitutions and alterations can be made without departing from the spirit and scope of the present invention.
Claims (8)
1. The utility model provides a plastic hinge district enlarges assembled pier that sways of cross-section, includes cushion cap (1), its characterized in that: the bearing platform (1) is sequentially provided with a prefabricated assembly pier bottom section (3) and a prefabricated assembly pier upper section (4); a rubber cushion layer (2) is arranged between the bearing platform (1) and the prefabricated assembly pier bottom section (3); the prefabricated spliced pier bottom section (3) is in a convex shape and comprises an enlarged section (3-1) of a plastic hinge area of the prefabricated spliced pier bottom section at the bottom and an upper section (3-2) of the prefabricated spliced pier bottom section in the middle; the prefabricated spliced pier upper section (4) is inverted-convex; a PVC reserved hole channel (7) is vertically and correspondingly arranged in the middle of each of the bearing platform (1), the precast spliced pier bottom section (3-2) and the precast spliced pier top section (4) and is used for penetrating a prestressed reinforcement (5) so as to realize unbonded anchoring connection of the bearing platform (1), the precast spliced pier bottom section (3) and the precast spliced pier top section (4) into a whole, and a prestressed reinforcement fixed end anchor (5-1) and a prestressed reinforcement tensioning end anchor (5-2) are respectively arranged at the bottom and the top of each prestressed reinforcement (5); in addition, a plurality of PVC reserved holes (7) are correspondingly arranged on the plastic hinge area expanded section (3-1) of the prefabricated spliced pier bottom section (3) at the bottom of the prefabricated spliced pier bottom section and the bearing platform (1) and are used for penetrating the energy-consumption steel bar group (6) to enable the plastic hinge area expanded section (3-1) of the prefabricated spliced pier bottom section and the bearing platform (1) to be in unbonded connection into a whole, and the top and the bottom of the energy-consumption steel bar group (6) are respectively provided with an energy-consumption steel bar group top end nut (6-1) and a self-locking one-way bolt anchoring end (6-2); grooves are formed in the bottom of the bearing platform (1) and the top of the prefabricated assembly pier upper section (4), and a first square steel backing plate (8-1) and a second square steel backing plate (8-3) are respectively arranged in the grooves; the prestressed reinforcement fixed end anchorage device (5-1) and the prestressed reinforcement tensioning end anchorage device (5-2) are respectively arranged at the outer sides of the first square steel backing plate (8-1) and the second square steel backing plate (8-3) and are used for tensioning and anchoring through a jack; an annular steel base plate (8-2) is paved at the top of the plastic hinge area enlarged section (3-1) of the bottom section of the prefabricated spliced pier, and the top nuts (6-1) of the energy-consumption reinforcing steel bar groups are fixed on the annular steel base plate (8-2) in a twisting manner;
the size of the enlarged section (3-1) of the plastic hinge area of the bottom section of the prefabricated pier is larger than the size of the upper section (3-2) of the bottom section of the middle prefabricated pier, and the size of the upper section (3-2) of the bottom section of the middle prefabricated pier is equal to the bottom size of the upper section (4) of the prefabricated pier; the thickness of the first square steel backing plate (8-1), the annular steel backing plate (8-2) and the second square steel backing plate (8-3) is 5-20mm, and the first square steel backing plate, the annular steel backing plate and the second square steel backing plate are used for preventing the damage of the concrete contact surface of the assembly member in the anchoring process.
2. The plastic hinge area enlarged-section fabricated swing pier according to claim 1, wherein: the top of the plastic hinge area enlarged section (3-1) of the bottom section of the prefabricated spliced pier is also provided with a protective cover (9) for preventing rainwater from penetrating.
3. The plastic hinge area enlarged-section fabricated swing pier according to claim 2, wherein: the protective cover (9) is in a frustum shape, and is sleeved on the upper section (3-2) of the prefabricated assembly pier bottom section at the middle part.
4. The plastic hinge area enlarged-section fabricated swing pier according to claim 2, wherein: the cross sections of the bearing platform (1), the prefabricated assembly pier bottom section (3) and the prefabricated assembly pier upper section (4) are square.
5. The plastic hinge area enlarged-section fabricated swing pier according to claim 4, wherein: the rubber cushion layer (2) is annular, the annular area of the rubber cushion layer is the same as the area of the enlarged section (3-1) of the plastic hinge area of the bottom section of the prefabricated assembly pier, the rubber cushion layer (2) is paved at the contact surface of the bearing platform (1) and the enlarged section (3-1) of the plastic hinge area of the bottom section of the prefabricated assembly pier, and is used for reducing the contact rigidity of the bottom of the pier, and when the pier swings under the action of strong earthquake, the local damage of the concrete of the pier at the bottom can be reduced, so that the earthquake energy of the part can be dissipated.
6. The plastic hinge area enlarged-section fabricated swing pier according to claim 5, wherein: the sizes of the first square steel backing plate (8-1) and the second square steel backing plate (8-3) are respectively the same as the sizes of grooves at the bottom of the bearing platform (1) and the top of the prefabricated assembly pier upper section (4).
7. The plastic hinge area enlarged-section fabricated swing pier according to claim 6, wherein: the PVC reserved pore channels (7) and the energy-consumption reinforcing steel bar sets (6) penetrating through the PVC reserved pore channels are arranged at equal intervals and symmetrically.
8. A construction method of a plastic hinge area enlarged section fabricated swing pier according to claim 7, comprising the steps of:
step one: and (3) construction of a bearing platform (1): binding reinforcing steel bars of a bearing platform (1) to form a reinforcing steel bar net, binding local encryption reinforcing steel bars, fixing a first square steel backing plate (8-1) at the bottom groove of the bearing platform (1) according to design requirements, embedding PVC pipelines in PVC reserved holes (7), ensuring the positions of the energy-consuming reinforcing steel bar groups (6), the first square steel backing plate (8-1) and the PVC pipelines to be correct, and pouring concrete of the bearing platform (1);
step two: prefabricating a pier body: pouring of a prefabricated spliced pier bottom section (3) and a prefabricated spliced pier upper section (4) is completed in a component processing field, the prefabricated spliced pier bottom section (3) is designed into a convex shape, a PVC reserved pore channel (7) is arranged at a plastic hinge area enlarged section (3-1) of the prefabricated spliced pier bottom section and an upper section (3-2) of the prefabricated spliced pier bottom section, and the PVC reserved pore channel (7) is arranged at the center of the prefabricated spliced pier upper section (4);
step three: hoisting a prefabricated spliced pier bottom section (3) and a prefabricated spliced pier upper section (4): the method comprises the steps of mounting a rubber cushion layer (2) on a designated position of the top surface of a bearing platform (1), mounting a precast spliced pier bottom section (3) on the bearing platform (1) in an aligned position, hoisting a precast spliced pier upper section (4) on the precast spliced pier bottom section (3), paving an annular steel backing plate (8-2) at the upper position of an enlarged section (3-1) of a plastic hinge area of the precast spliced pier bottom section, paving a second square steel backing plate (8-3) at the position of a groove at the top of the precast spliced pier upper section (4), and ensuring that all reserved PVC reserved pore channels (7) of the whole precast spliced structure and openings of corresponding steel backing plates are on the same vertical line in the hoisting process;
step four: connecting prefabricated spliced pier segments: connecting a prefabricated assembled pier body and a bearing platform through anchoring of a prestressed reinforcement (5), wherein the prestressed reinforcement (5) passes through the PVC reserved pore canal (7), a prestressed reinforcement fixed end anchor (5-1) is installed at a groove at the bottom of the bearing platform (1), a prestressed reinforcement tensioning end anchor (5-2) is installed on a second square steel backing plate (8-3) paved at the top end of the upper section (4) of the prefabricated assembled pier, and tensioning and anchoring of the prestressed reinforcement (5) are implemented by using a jack; the energy-consuming steel bar set (6) is anchored and installed through PVC reserved holes (7) which are formed in the periphery of the expansion section (3-1) of the section plastic hinge area at the bottom of the prefabricated spliced pier, the bottom end of the energy-consuming steel bar set is fixed at the groove at the bottom of the bearing platform (1) and anchored by adopting a self-locking one-way bolt anchoring end (6-2), and the top end of the energy-consuming steel bar set is twisted and fixed on the annular steel base plate (8-2) paved on the expansion section (3-1) of the section plastic hinge area at the bottom of the prefabricated spliced pier by utilizing energy-consuming steel bar set top end nuts (6-1);
step five: after the connection construction among the prefabricated spliced pier bottom section (3), the prefabricated spliced pier upper section (4) and the bearing platform (1) is completed, a protective cover (9) is additionally arranged at the top end of the energy-consumption reinforcing steel bar group (6), and finally the integral installation of the plastic hinge area expansion section fabricated swing pier is completed.
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| CN114561867B (en) * | 2022-03-10 | 2024-03-15 | 广州市市政工程设计研究总院有限公司 | Sectional type self-resetting bridge pier with replaceable energy consumption piece after earthquake |
| CN114753272A (en) * | 2022-05-05 | 2022-07-15 | 中交路桥华东工程有限公司 | Construction method of prestressed bearing platform for bridge pier repair |
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| JPH10266125A (en) * | 1997-03-26 | 1998-10-06 | Hitachi Zosen Corp | Bridge pier structure of highway bridge |
| CN105755952B (en) * | 2016-04-15 | 2017-12-22 | 柳州欧维姆机械股份有限公司 | Implanted elastic caoutchouc stand apparatus and its construction method being connected for prefabricated concrete bridge pier stud with cushion cap |
| CN206109970U (en) * | 2016-08-31 | 2017-04-19 | 南京理工大学 | Prefabricated assembled pier suitable for well meizoseismal area |
| CN209227365U (en) * | 2018-11-29 | 2019-08-09 | 福州大学 | The Self-resetting assembled bridge pier of replaceable additional mild steel |
| CN110468694B (en) * | 2019-09-06 | 2024-04-30 | 郑州大学 | Socket type self-resetting multi-section prefabricated pier and assembly method thereof |
| CN211621177U (en) * | 2019-10-16 | 2020-10-02 | 中铁第四勘察设计院集团有限公司 | Upright post segment, assembled pier upright post and bridge lower part structure |
| CN110777661B (en) * | 2019-10-29 | 2021-02-02 | 北京交通大学 | Flange connection prefabricated assembly pier structure and construction method thereof |
| CN212834959U (en) * | 2020-04-16 | 2021-03-30 | 连云港市建筑设计研究院有限责任公司 | Self-reset single pier column structure utilizing steel plate to dissipate energy |
| CN213038180U (en) * | 2020-06-23 | 2021-04-23 | 陕西省建筑科学研究院有限公司 | Pier is assembled to dry joint unbonded prestressing force recycled concrete festival section |
| CN111764303A (en) * | 2020-07-06 | 2020-10-13 | 中设设计集团股份有限公司 | Connecting structure and construction method of prefabricated pier stand column and bearing platform |
| CN113186812A (en) * | 2021-05-26 | 2021-07-30 | 南京理工大学 | Prestressed segment assembled pier with SMA energy dissipation reinforcing steel bars at bottom and assembling method |
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