CN114000416A - Segment-replaceable prefabricated assembled mixed pier and construction method thereof - Google Patents
Segment-replaceable prefabricated assembled mixed pier and construction method thereof Download PDFInfo
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- CN114000416A CN114000416A CN202111299026.7A CN202111299026A CN114000416A CN 114000416 A CN114000416 A CN 114000416A CN 202111299026 A CN202111299026 A CN 202111299026A CN 114000416 A CN114000416 A CN 114000416A
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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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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/42—Foundations for poles, masts or chimneys
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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
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
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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
- E01D2101/00—Material constitution of bridges
- E01D2101/30—Metal
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/20—Miscellaneous comprising details of connection between elements
Abstract
The invention relates to a prefabricated and assembled mixed pier with replaceable segments, which comprises a pier body consisting of an upper reinforced concrete pier column segment, a concrete-filled steel tube core column and a replaceable lower prefabricated hollow thin-wall steel pier segment, wherein the upper reinforced concrete pier column segment and the concrete-filled steel tube core column are prefabricated into a whole and are inserted into a cup groove reserved in a bearing platform, and the lower prefabricated hollow thin-wall steel pier segment, the upper reinforced concrete pier column segment and the bearing platform are connected through high-strength bolts. The structure atress is clear and definite, and it is reliable to pass power, and has the removable festival section of meeting with strong earthquake effect after damaging, the characteristic of quick recovery function, has solved that the traditional prefabrication is assembled pier power consumption ability relatively poor, is difficult to restore the scheduling problem after the earthquake damage.
Description
Technical Field
The invention relates to a prefabricated and assembled mixed pier with replaceable segments and a construction method thereof, and belongs to the technical field of design and construction of prefabricated and assembled piers in bridge engineering.
Background
The bridge pier is not only a main component of the bridge, but also plays a vital role in the seismic performance of the bridge. According to the current highway bridge anti-seismic design specification in China, a bridge adopting the ductile anti-seismic design should select a pier as a ductile member. Thus, when subjected to a strong earthquake, concrete piers are often severely damaged or even irreparably destroyed, thereby severely affecting the service function of the bridge and even causing long-term interruption of road traffic, resulting in immeasurable economic losses.
On the other hand, in recent years, bridge construction has been changed from a traditional cast-in-place construction mode to a green construction mode, and the synchronous prefabrication and assembly construction technology of the upper and lower structures of the bridge is rapidly developed. At present, the prefabrication and assembly construction technology of the bridge superstructure tends to be mature, however, how to ensure that the prefabricated assembled pier has the performance of an integral cast-in-place pier is the problem which needs to be solved for realizing the full prefabrication and assembly construction of the bridge superstructure and substructure at present. The traditional prefabricated pier stud assembling process comprises grouting sleeve connection, grouting metal corrugated pipe connection, socket joint type connection, slot type connection, post-tensioned prestressed rib connection, flange connection and the like, but the conventional connection structure has the problems of difficult construction, difficult grouting quality detection, poor energy consumption capability under the action of an earthquake, difficult repair after earthquake damage and the like, and the development and application of the construction technology of the fully prefabricated assembled bridge are limited, particularly the popularization and application in high-intensity earthquake areas.
In recent years, the bridge seismic design concept has been developed from seismic resistance, seismic isolation and reduction to post-seismic restorable design. The anti-seismic design with the recoverable function ensures that the structure can be recovered to be normally used after the earthquake without repairing or slightly repairing, and reduces the influence caused by functional interruption after the earthquake. At present, there are various technical approaches to achieve post-earthquake recoverability of bridges, including a sway structure, a self-resetting structure, a replaceable member structure, and the like. The advantages of the prefabricated assembled pier technology and the recoverable function seismic structure are combined, the prefabricated assembled mixed pier with the replaceable segments and the implementation scheme of the prefabricated assembled mixed pier are provided, the problems that the traditional prefabricated assembled pier is poor in energy consumption capability under the action of an earthquake, is not easy to repair after the earthquake damage and the like are solved, and the application requirements of engineering can be met.
Disclosure of Invention
In view of the defects of the prior art, the technical problem to be solved by the invention is to provide a prefabricated assembled mixed pier with replaceable segments and a construction method thereof.
In order to solve the technical problems, the technical scheme of the invention is as follows: the prefabricated assembled mixed pier with the replaceable segments comprises a pier body which is composed of an upper reinforced concrete pier column segment, a steel pipe concrete core column and a replaceable lower prefabricated hollow thin-wall steel pier segment, wherein the upper reinforced concrete pier column segment and the steel pipe concrete core column are prefabricated into a whole and are inserted into a cup groove reserved in a bearing platform, and the lower prefabricated hollow thin-wall steel pier segment is connected with the upper reinforced concrete pier column segment and the bearing platform through high-strength bolts.
Preferably, the bottom of the cup groove is provided with an embedded steel plate to meet the requirement of local pressure bearing of the pier bottom; gaps around the concrete filled steel tube core column and the cup groove are filled with asphalt burlap cutters, and a simple pier bottom hinge structure is formed.
Preferably, the lower section of the prefabricated hollow thin-wall steel pier is made of common steel or low-yield-point steel, the section of the prefabricated hollow thin-wall steel pier is in a box shape, longitudinal stiffening ribs and perforated transverse clapboards are arranged in the steel box section, a lower flange is welded at the top of the prefabricated hollow thin-wall steel pier, and a toe board is welded at the bottom of the prefabricated hollow thin-wall steel pier; the lower flange is welded with the lower section of the prefabricated hollow thin-wall steel pier through a first stiffening rib, the column foot plate is welded with the lower section of the prefabricated hollow thin-wall steel pier through a second stiffening rib, and the lower section of the prefabricated hollow thin-wall steel pier is reliably anchored and connected with the bearing platform through the column foot plate, an anchoring steel plate embedded in the bearing platform and a first high-strength bolt.
Preferably, the bottom of the upper section of the reinforced concrete pier stud is provided with an upper flange, and the upper section of the reinforced concrete pier stud is reliably screwed with the lower section of the prefabricated hollow thin-wall steel pier through the upper flange, the lower flange and the second high-strength bolt, so that the mixed pier stud is formed; and a rubber gasket is arranged between the upper flange and the lower flange so as to reduce the axial pressure borne by the lower section of the prefabricated hollow thin-wall steel pier.
Preferably, the upper section of the reinforced concrete pier stud is internally provided with a longitudinal stressed steel bar and a transverse stirrup, the bottom of the upper section of the reinforced concrete pier stud is provided with an upper flange with an opening, and the bottom of the longitudinal stressed steel bar is connected with the upper surface of the upper flange in a welding manner; the steel pipe concrete core column is a circular high-strength steel pipe concrete column, and a bin sealing steel plate is arranged at the bottom of the steel pipe concrete core column; the concrete-filled steel tube core column penetrates through the upper flange with the opening to enter the upper section of the reinforced concrete pier column, the upper flange and the high-strength steel tube at the periphery of the concrete-filled steel tube core column are connected into a whole through welding, and a third stiffening rib is arranged between the concrete-filled steel tube core column and the upper flange; the concrete filled steel tube core column entering the upper section of the reinforced concrete pier stud is provided with shear nails so as to realize reliable transmission of internal force.
Preferably, the column foot plate welded at the bottom of the lower section of the prefabricated hollow thin-wall steel pier is made of a high-strength steel plate, and bolt holes arranged in an array are formed in the plate.
Preferably, the anchoring steel plate pre-embedded in the bearing platform is formed by processing a high-strength steel plate, and bolt holes arranged in an array are formed in the anchoring steel plate; and a high-strength nut sleeve is arranged at the position corresponding to the bolt hole and is connected with the bottom surface of the anchoring steel plate in a welding manner.
Preferably, the annular arrangement mode of the bolt holes formed in the anchoring steel plate is the same as the arrangement mode of the bolt holes formed in the column foot plate, and the bolt holes correspond to the bolt holes in the column foot plate one to one.
Preferably, a cup groove for inserting and installing the concrete filled steel tube core column is reserved at the upper part of the bearing platform, the shape of the cup groove is the same as that of the concrete filled steel tube core column, and a certain gap is reserved between the inner surface of the cup groove and the concrete filled steel tube core column to allow the pier body to rotate.
A construction method of a segment-replaceable prefabricated assembled mixed pier is carried out according to the following steps: the construction method comprises two situations that a newly-built bridge and an existing bridge are damaged after earthquake and need to be replaced:
for a newly-built bridge, the main construction method is as follows:
(1) constructing a foundation at the bottom of the pier body, binding a bearing platform steel bar, accurately lofting and installing an anchoring steel plate in the bearing platform, an embedded steel plate at the bottom of the cup groove and other embedded parts, installing a bearing platform template, pouring bearing platform concrete and maintaining the concrete to the strength required by the design; in the process of foundation construction, the integrated prefabrication of the upper section of the reinforced concrete pier column and the concrete-filled steel tube core column and the prefabrication of the lower section of the prefabricated hollow thin-wall steel pier are carried out in parallel;
(2) mounting the lower section of the prefabricated hollow thin-wall steel pier, and primarily screwing a first high-strength bolt between the column foot plate and the anchoring steel plate; in order to facilitate installation and replacement, the lower section of the prefabricated hollow thin-wall steel pier is divided into two symmetrical left and right half steel box sections for processing when being manufactured, the left and right half steel box sections are welded, after the welding is finished, a rubber gasket is arranged on a lower flange, and proper limiting measures are taken to prevent the rubber gasket from shifting;
(3) the asphalt hemp cutter cushion layer between the bottom of the cup groove and the side wall of the cup groove is reserved on the construction bearing platform;
(4) hoisting the upper section of the reinforced concrete pier stud and the concrete-filled steel tube core column, screwing a second high-strength bolt between the upper flange and the lower flange after the upper section of the reinforced concrete pier stud and the concrete-filled steel tube core column are in place, and finally screwing a first high-strength bolt between the column foot plate and the anchoring steel plate;
(5) installing the upper structure of the bridge, and constructing a bridge deck system and auxiliary facilities thereof;
for the situation that the earthquake is damaged and needs to be replaced, the main construction method is as follows:
judging whether the prefabricated hollow thin-wall steel pier needs to be replaced according to the damage condition of the lower segment of the prefabricated hollow thin-wall steel pier, and performing the following treatment on the prefabricated hollow thin-wall steel pier needing to be replaced:
(1) temporary oblique supports are erected around the upper sections of the reinforced concrete pier columns, so that the safety and stability of the pier bodies in the replacement process are guaranteed;
(2) removing a second high-strength bolt between the upper flange and the lower flange and a first high-strength bolt between the column foot plate and the anchoring steel plate, cutting and removing a lower section of the prefabricated hollow thin-wall steel pier to be replaced, wherein the steel pipe concrete core column plays a role in supporting an upper structure at the moment, and a temporary vertical supporting system is not required to be erected;
(3) hoisting a new lower section of the prefabricated hollow thin-wall steel pier, primarily screwing a first high-strength bolt between a column foot plate and an anchoring steel plate as required, and welding a left half steel box section and a right half steel box section;
(4) and after welding, screwing the second high-strength bolt between the upper flange and the lower flange, and finally screwing the first high-strength bolt between the column foot plate and the anchoring steel plate to complete replacement of the lower section of the prefabricated hollow thin-wall steel pier.
Compared with the prior art, the invention has the following beneficial effects: the structure atress is clear and definite, and it is reliable to pass power, and has the removable festival section of meeting with strong earthquake effect after damaging, the characteristic of quick recovery function, has solved that the traditional prefabrication is assembled pier power consumption ability relatively poor, is difficult to restore the scheduling problem after the earthquake damage.
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Drawings
Fig. 1 is an overall structural view of a mixing pier of the present invention.
Fig. 2 is a top view of the overall construction of the mixing pier of the present invention.
Fig. 3 is a sectional view taken along line a-a of fig. 1.
Fig. 4 is a sectional view taken along line B-B of fig. 1.
Fig. 5 is a cross-sectional view of the C-C section of fig. 1.
Fig. 6 is a cross-sectional view taken along line D-D of fig. 1.
Detailed Description
The invention is further explained below with reference to the drawings and the embodiments.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As shown in fig. 1 to 6, the embodiment provides a prefabricated assembled hybrid pier with replaceable segments, which includes a pier body composed of an upper reinforced concrete pier column segment 1, a concrete-filled steel tube core column 2 and a lower replaceable prefabricated hollow thin-wall steel pier segment 4, wherein the upper reinforced concrete pier column segment 1 and the concrete-filled steel tube core column 2 are prefabricated into a whole and are inserted into a cup groove reserved in a bearing platform 10, and the lower prefabricated hollow thin-wall steel pier segment 4 is connected with the upper reinforced concrete pier column segment 1 and the bearing platform 10 through high-strength bolts. In the aspect of structural stress, the concrete-filled steel tube core column 2 mainly bears and transmits axial force, the lower section 4 of the prefabricated hollow thin-wall steel pier mainly bears and transmits horizontal shearing force and bending moment, and the force transmission mechanism is clear and easy to realize.
In the embodiment of the invention, in order to facilitate installation and replacement, the lower section 4 of the prefabricated hollow thin-wall steel pier is divided into two symmetrical left and right half steel box sections for processing; when the left and right half steel box sections are installed, the left and right half steel box sections are welded by adopting a single-side groove weld joint, and the abutted seams of the top lower flange 18 and the bottom column foot plate 19 can be not welded.
In the embodiment of the invention, the bottom of the cup groove is provided with the embedded steel plate 9 so as to meet the requirement of local pressure bearing of the pier bottom; gaps around the concrete filled steel tube core column 2 and the cup groove are filled with asphalt pockmarks 8, and a simple pier bottom hinge structure is formed.
In the embodiment of the invention, the lower section 4 of the prefabricated hollow thin-wall steel pier is made of common steel or low-yield-point steel, the section of the prefabricated hollow thin-wall steel pier is in a box shape, a longitudinal stiffening rib 7 and a perforated diaphragm plate 16 are arranged in the steel box section, a lower flange 18 is welded at the top of the prefabricated hollow thin-wall steel pier, and a toe board 19 is welded at the bottom of the prefabricated hollow thin-wall steel pier; a first stiffening rib 14 is welded between the lower flange 18 and the lower section 4 of the prefabricated hollow thin-wall steel pier, a second stiffening rib 12 is welded between the column foot plate 19 and the lower section 4 of the prefabricated hollow thin-wall steel pier, and reliable anchoring connection is carried out between the lower section 4 of the prefabricated hollow thin-wall steel pier and the bearing platform 10 through the column foot plate 19, the anchoring steel plate 5 pre-embedded in the bearing platform 10 and the first high-strength bolt 15.
In the embodiment of the invention, the upper flange 3 is arranged at the bottom of the reinforced concrete pier stud upper section 1, and the reinforced concrete pier stud upper section 1 is reliably screwed with the prefabricated hollow thin-wall steel pier lower section 4 through the upper flange, the lower flange and the second high-strength bolt 13, so that the mixed pier stud is formed; and a rubber gasket 20 is arranged between the upper flange and the lower flange to reduce the axial pressure borne by the lower section 4 of the prefabricated hollow thin-wall steel pier. When the strong earthquake action is encountered, only the lower section 4 of the prefabricated hollow thin-wall steel pier in the mixed pier column is subjected to yield and plastic deformation, the good plastic deformation capacity of steel is utilized to dissipate earthquake energy, and the upper section 1 of the reinforced concrete pier column and the concrete-filled steel tube core column 2 are always kept in an elastic undamaged state.
In the embodiment of the invention, the upper section 1 of the reinforced concrete pier column is designed according to a conventional reinforced concrete pier, a longitudinal stress steel bar 17 and a transverse stirrup 22 are arranged in the upper section 1, an upper flange 3 with an opening is arranged at the bottom of the upper section, and the bottom of the longitudinal stress steel bar 17 is connected with the upper surface of the upper flange 3 in a welding manner; the steel pipe concrete core column 2 is designed according to an axial compression member, a round high-strength steel pipe concrete column is adopted, and a bin sealing steel plate is arranged at the bottom of the round high-strength steel pipe concrete column; the concrete-filled steel tube core column 2 penetrates through the upper flange 3 with the opening to enter the upper section 1 of the reinforced concrete pier column, the upper flange 3 and a high-strength steel tube at the periphery of the concrete-filled steel tube core column 2 are connected into a whole by welding, and a third stiffening rib 21 is arranged between the concrete-filled steel tube core column 2 and the upper flange 3; the concrete filled steel tube core column 2 entering the upper section 1 of the reinforced concrete pier column is provided with the shear nails 11 so as to realize the reliable transmission of internal force.
In the embodiment of the invention, the column foot plate 19 welded at the bottom of the lower section 4 of the prefabricated hollow thin-wall steel pier is made of a high-strength steel plate, and bolt holes arranged in an array are formed in the plate. The lower segment 4 of the prefabricated hollow thin-wall steel pier is designed according to a bending component and mainly bears and transmits horizontal shearing force and bending moment.
In the embodiment of the invention, the anchoring steel plate 5 pre-embedded in the bearing platform 10 is formed by processing a high-strength steel plate, and bolt holes arranged in an array are formed in the anchoring steel plate; and a high-strength nut sleeve 6 is arranged at the position corresponding to the bolt hole, and the high-strength nut sleeve 6 is connected with the bottom surface of the anchoring steel plate 5 in a welding manner. The verticality of the nut sleeve is strictly controlled in the welding process.
In the embodiment of the present invention, the bolt holes formed in the anchor steel plate 5 are arranged in the same ring shape as the bolt holes formed in the toe plate 19, and the bolt holes correspond to the bolt holes one to one. And strictly lofting according to requirements.
In the embodiment of the invention, a cup groove for inserting and installing the concrete filled steel tube core column 2 is reserved at the upper part of the bearing platform 10, the shape of the cup groove is the same as that of the concrete filled steel tube core column 2, and a certain gap is reserved between the inner surface of the cup groove and the concrete filled steel tube core column 2 to allow the pier body to rotate.
A construction method of a segment-replaceable prefabricated assembled mixed pier is carried out according to the following steps: the construction method comprises two situations that a newly-built bridge and an existing bridge are damaged after earthquake and need to be replaced:
for a newly-built bridge, the main construction method is as follows:
(1) constructing a foundation at the bottom of the pier body, binding a bearing platform steel bar, accurately lofting and installing an anchoring steel plate 5 in the bearing platform, an embedded steel plate 9 at the bottom of the cup groove and other embedded parts, installing a bearing platform template, pouring bearing platform concrete and maintaining the concrete to the strength required by the design; in the process of foundation construction, the integrated prefabrication of the upper section 1 of the reinforced concrete pier column and the concrete filled steel tube core column 2 and the prefabrication of the lower section 4 of the prefabricated hollow thin-wall steel pier are carried out in parallel;
(2) mounting the lower section 4 of the prefabricated hollow thin-wall steel pier, and primarily screwing a first high-strength bolt 15 between the column foot plate 19 and the anchoring steel plate 5; for convenience of installation and replacement, the lower section 4 of the prefabricated hollow thin-wall steel pier is divided into two symmetrical left and right half steel box sections for processing when being manufactured, the left and right half steel box sections are welded, after the welding is finished, a rubber gasket 20 is placed on the lower flange 18, and a proper limiting measure is adopted to prevent the rubber gasket 20 from shifting;
(3) the construction bearing platform 10 is reserved with an asphalt hemp cutter 8 cushion layer between the bottom of the cup groove and the side wall of the cup groove;
(4) hoisting the upper section 1 of the reinforced concrete pier stud and the concrete-filled steel tube core column 2, screwing the second high-strength bolt 13 between the upper flange 3 and the lower flange 18 after the upper section 1 and the concrete-filled steel tube core column are in place, and finally screwing the first high-strength bolt 15 between the column foot plate 19 and the anchoring steel plate 5;
(5) installing the upper structure of the bridge, and constructing a bridge deck system and auxiliary facilities thereof;
for the situation that the earthquake is damaged and needs to be replaced, the main construction method is as follows:
judging whether the prefabricated hollow thin-wall steel pier needs to be replaced according to the damage condition of the lower segment 4 of the prefabricated hollow thin-wall steel pier, and performing the following treatment on the prefabricated hollow thin-wall steel pier that needs to be replaced:
(1) a temporary oblique support is erected around the upper section 1 of the reinforced concrete pier stud to ensure the safety and stability of the pier body in the replacement process;
(2) the second high-strength bolt 13 between the upper flange 3 and the lower flange 18 and the first high-strength bolt 15 between the toe plate 19 and the anchoring steel plate 5 are removed, the lower section 4 of the prefabricated hollow thin-wall steel pier needing to be replaced is cut and removed, and the concrete-filled steel tube core column 2 plays a role in supporting an upper structure at the moment, and a temporary vertical supporting system does not need to be erected;
(3) hoisting a new lower section 4 of the prefabricated hollow thin-wall steel pier, primarily screwing a first high-strength bolt 15 between a column foot plate 19 and an anchoring steel plate 5 as required, and welding a left half steel box section and a right half steel box section;
(4) and after welding, screwing the second high-strength bolt 13 between the upper flange 3 and the lower flange 18, and finally screwing the first high-strength bolt 15 between the column foot plate 19 and the anchoring steel plate 5 to complete replacement of the lower section 4 of the prefabricated hollow thin-wall steel pier.
In the aspect of construction, the integrally prefabricated reinforced concrete pier column upper section 1 and the steel pipe concrete core column 2 are inserted into a reserved cup groove of a bearing platform to form a simple pier bottom hinge structure; the lower section 4 of the prefabricated hollow thin-wall steel pier is connected with the upper section 1 of the reinforced concrete pier column and the bearing platform through high-strength bolts, the structural design is simple, the installation and the replacement are easy, and the technical problems that the conventional prefabricated assembled pier connection structure is difficult to construct, the grouting quality is difficult to detect and the like are solved. In design, the upper section 1 of the reinforced concrete pier column is designed according to a conventional reinforced concrete pier, the concrete-filled steel tube core column 2 is designed according to an axial compression component, the bearing axial force is taken as a main part, the lower section 4 of the prefabricated hollow thin-wall steel pier is designed according to a bending component, the shearing force and the bending moment are mainly borne, the structural stress is clear, and the force transmission is reliable. Particularly, when the strong earthquake action is encountered, only the lower section 4 of the prefabricated hollow thin-wall steel pier in the mixed pier column is subjected to yield and plastic deformation, the good plastic deformation capacity of steel is utilized to dissipate earthquake energy, and the upper section 1 of the reinforced concrete pier column and the concrete-filled steel tube core column 2 are always kept in an elastic undamaged state; after the earthquake, whether the prefabricated hollow thin-wall steel pier lower segment 4 needs to be replaced or not is judged according to the damage condition of the prefabricated hollow thin-wall steel pier lower segment 4, in the replacement process, the steel pipe concrete core column 2 plays a role in supporting an upper structure, a strong temporary vertical supporting system does not need to be additionally erected, the replacement process is safe, convenient and efficient, the quick recovery of the using function of the bridge after the earthquake can be realized, and the technical problems that the conventional prefabricated assembled pier is poor in energy consumption capacity under the earthquake action, and is not easy to repair after the earthquake damage are solved.
The foregoing is directed to preferred embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope of the technical solution of the present invention.
Claims (10)
1. The utility model provides a mixed mound is assembled in prefabrication of removable festival section which characterized in that: the prefabricated hollow steel pier comprises a pier body which is composed of a reinforced concrete pier column upper section (1), a steel pipe concrete core column (2) and a replaceable prefabricated hollow thin-wall steel pier lower section (4), wherein the reinforced concrete pier column upper section (1) and the steel pipe concrete core column (2) are prefabricated into a whole and are inserted into a cup groove reserved in a bearing platform (10), and the prefabricated hollow thin-wall steel pier lower section (4) is connected with the reinforced concrete pier column upper section (1) and the bearing platform (10) through high-strength bolts.
2. The segment replaceable prefabricated building hybrid pier of claim 1, wherein: the bottom of the cup groove is provided with an embedded steel plate (9) to meet the requirement of local bearing of the pier bottom; gaps around the concrete filled steel tube core column (2) and the cup groove are filled with asphalt pockmarks (8), and a simple pier bottom hinge structure is formed.
3. The segment replaceable prefabricated building hybrid pier of claim 1, wherein: the lower section (4) of the prefabricated hollow thin-wall steel pier is made of common steel or low-yield-point steel, the section of the lower section is in a box shape, a longitudinal stiffening rib (7) and a perforated diaphragm plate (16) are arranged in the steel box section, a lower flange (18) is welded at the top of the lower section, and a toe board (19) is welded at the bottom of the lower section; the lower flange (18) and the lower section (4) of the prefabricated hollow thin-wall steel pier are welded with a first stiffening rib (14), the column foot plate (19) and the lower section (4) of the prefabricated hollow thin-wall steel pier are welded with a second stiffening rib (12), and the lower section (4) of the prefabricated hollow thin-wall steel pier and the bearing platform (10) are reliably anchored and connected through the column foot plate (19), an anchoring steel plate (5) embedded in the bearing platform (10) and a first high-strength bolt (15).
4. The segment replaceable prefabricated building hybrid pier of claim 3, wherein: the bottom of the reinforced concrete pier stud upper section (1) is provided with an upper flange (3), and the reinforced concrete pier stud upper section (1) is reliably screwed with the prefabricated hollow thin-wall steel pier lower section (4) through the upper flange, the lower flange and a second high-strength bolt (13), so that a mixed pier stud is formed; a rubber gasket (20) is arranged between the upper flange and the lower flange so as to reduce the axial pressure borne by the lower segment (4) of the prefabricated hollow thin-wall steel pier.
5. The segment replaceable prefabricated building hybrid pier of claim 1, wherein: the reinforced concrete pier stud upper segment (1) is internally provided with a longitudinal stress steel bar (17) and a transverse stirrup (22), the bottom of the reinforced concrete pier stud upper segment is provided with an upper flange (3) with an opening, and the bottom of the longitudinal stress steel bar (17) is connected with the upper surface of the upper flange (3) in a welding manner; the steel tube concrete core column (2) adopts a circular high-strength steel tube concrete column, and a bin sealing steel plate is arranged at the bottom of the steel tube concrete core column; the concrete-filled steel tube core column (2) penetrates through the upper flange (3) with the opening to enter the upper section (1) of the reinforced concrete pier column, the upper flange (3) and a high-strength steel tube on the periphery of the concrete-filled steel tube core column (2) are connected into a whole through welding, and a third stiffening rib (21) is arranged between the concrete-filled steel tube core column (2) and the upper flange (3); the concrete filled steel tube core column (2) entering the upper section (1) of the reinforced concrete pier column is provided with the shear nails (11) so as to realize the reliable transmission of internal force.
6. The segment replaceable prefabricated building hybrid pier of claim 1, wherein: a column foot plate (19) welded at the bottom of the lower section (4) of the prefabricated hollow thin-wall steel pier is made of a high-strength steel plate, and bolt holes arranged in an array are formed in the plate.
7. The segment replaceable prefabricated building hybrid pier of claim 6, wherein: the anchoring steel plate (5) pre-embedded in the bearing platform (10) is formed by processing a high-strength steel plate, and bolt holes which are arranged in an array are formed in the anchoring steel plate; and a high-strength nut sleeve (6) is arranged at the position corresponding to the bolt hole, and the high-strength nut sleeve (6) is connected with the bottom surface of the anchoring steel plate (5) in a welding manner.
8. The segment replaceable prefabricated building hybrid pier of claim 7, wherein: the annular arrangement mode of the bolt holes formed in the anchoring steel plate (5) is the same as the arrangement mode of the bolt holes formed in the column foot plate (19), and the bolt holes correspond to the bolt holes in one-to-one mode.
9. The segment replaceable prefabricated building hybrid pier of claim 1, wherein: the upper portion of the bearing platform (10) is reserved with a cup groove for the concrete filled steel tube core column (2) to be inserted and installed, the shape of the cup groove is the same as that of the concrete filled steel tube core column (2), and a certain gap is reserved between the inner surface of the cup groove and the concrete filled steel tube core column (2) to allow the pier body to rotate.
10. A method of constructing a prefabricated segment ready-to-assemble hybrid pier of replaceable segments, according to any of claims 1 to 9, comprising the following steps: the construction method comprises two situations that a newly-built bridge and an existing bridge are damaged after earthquake and need to be replaced:
for a newly-built bridge, the main construction method is as follows:
(1) constructing a foundation at the bottom of the pier body, binding a bearing platform steel bar, accurately lofting and installing an anchoring steel plate (5) in the bearing platform, an embedded steel plate (9) at the bottom of the cup groove and other embedded parts, installing a bearing platform template, pouring bearing platform concrete and maintaining the concrete to the strength required by the design; in the process of foundation construction, the integrated prefabrication of the upper section (1) of the reinforced concrete pier column and the concrete filled steel tube core column (2) and the prefabrication of the lower section (4) of the prefabricated hollow thin-wall steel pier are carried out in parallel;
(2) the lower section (4) of the prefabricated hollow thin-wall steel pier is installed, and a first high-strength bolt (15) between a column foot plate (19) and an anchoring steel plate (5) is initially screwed; for convenience of installation and replacement, the lower section (4) of the prefabricated hollow thin-wall steel pier is divided into two symmetrical left and right half steel box sections for processing when being manufactured, the left and right half steel box sections are welded, after the welding is finished, a rubber gasket (20) is placed on the lower flange (18), and a proper limiting measure is adopted to prevent the rubber gasket (20) from shifting;
(3) a cushion layer of an asphalt hemp cutter (8) between the bottom of the cup groove and the side wall of the cup groove is reserved on the construction bearing platform (10);
(4) hoisting the upper section (1) of the reinforced concrete pier stud and the concrete-filled steel tube core column (2), screwing a second high-strength bolt (13) between the upper flange (3) and the lower flange (18) after the upper section and the concrete-filled steel tube core column are in place, and finally screwing a first high-strength bolt (15) between the column foot plate (19) and the anchoring steel plate (5);
(5) installing the upper structure of the bridge, and constructing a bridge deck system and auxiliary facilities thereof;
for the situation that the earthquake is damaged and needs to be replaced, the main construction method is as follows:
judging whether the lower segment (4) of the prefabricated hollow thin-wall steel pier needs to be replaced according to the damage condition of the lower segment, and performing the following treatment on the lower segment which needs to be replaced:
(1) temporary oblique supports are erected around the upper section (1) of the reinforced concrete pier stud, so that the safety and stability of the pier body in the replacement process are guaranteed;
(2) the second high-strength bolt (13) between the upper flange (3) and the lower flange (18) and the first high-strength bolt (15) between the column foot plate (19) and the anchoring steel plate (5) are removed, the lower section (4) of the prefabricated hollow thin-wall steel pier needing to be replaced is cut and removed, the concrete-filled steel tube core column (2) plays a role in supporting an upper structure at the moment, and a temporary vertical supporting system does not need to be erected;
(3) hoisting a new lower section (4) of the prefabricated hollow thin-wall steel pier, primarily screwing a first high-strength bolt (15) between a column foot plate (19) and an anchoring steel plate (5) as required, and welding a left half steel box section and a right half steel box section;
(4) and after welding, screwing down the second high-strength bolt (13) between the upper flange (3) and the lower flange (18), and finally screwing down the first high-strength bolt (15) between the column foot plate (19) and the anchoring steel plate (5) to finish the replacement of the lower section (4) of the prefabricated hollow thin-wall steel pier.
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