CN212641180U - Large cantilever cover beam type pier - Google Patents

Large cantilever cover beam type pier Download PDF

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Publication number
CN212641180U
CN212641180U CN202020389423.8U CN202020389423U CN212641180U CN 212641180 U CN212641180 U CN 212641180U CN 202020389423 U CN202020389423 U CN 202020389423U CN 212641180 U CN212641180 U CN 212641180U
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China
Prior art keywords
pier
section
bent cap
top section
steel
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Withdrawn - After Issue
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CN202020389423.8U
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Chinese (zh)
Inventor
叶伟
王雷
丘燊
罗火生
徐东进
段银龙
梁传波
王同
杨钻
韩金豹
盛捷
蔡小瑾
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Guangdong communication Planning and Design Institute Group Co Ltd
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Guangdong Province Communications Planning & Design Institute Co ltd
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Priority to CN202020389423.8U priority Critical patent/CN212641180U/en
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Abstract

The utility model discloses a big cantilever bent cap formula pier, including the bent cap, pier stud and basis, the bent cap is big cantilever bent cap, stretch out the section including pier top section and two, two sections of stretching out are connected respectively on the both ends of pier top section, the top surface of pier top section is the epirelief curved surface, the top surface of stretching out the section is the horizontal plane, the bottom surface of bent cap is from the inclined plane of pier towards both sides tilt up, there is the steel bundle along the cross-bridge to the anchor on the bent cap, the linear bundle of steel bundle is identical, the part of steel bundle in the pier top section is the epirelief curve that suits with the top surface of pier top section in order to provide internal prestress of body, pier top section slope is worn out respectively to extend downwards to the top of stretching out the section and the anchor is in order to provide external prestressing force at the tip of stretching out the section at the both ends of steel bundle. The utility model discloses save material, the pier is whole slim and graceful penetrating, and the view is good, has addd the mechanics aesthetic feeling, just the utility model discloses space utilization is high, still can reduce prestressing loss, is convenient for inspect, maintain and change the prestressing force bundle. The construction period can be shortened, and the bridge type is more suitable.

Description

Large cantilever cover beam type pier
Technical Field
The utility model belongs to the technical field of bridge engineering, in particular to big cantilever bent cap formula pier.
Background
The development of cities is always limited by limited land and space, and with the increase of population and traffic flow, the existing urban viaduct is difficult to meet the increasing traffic demand. How to construct the bridge fast under the condition of not interrupting the traffic, avoid the pier to invade the road to can compromise pleasing to the eye, improve the land utilization in city simultaneously, these problems await urgent need people to seek an efficient, reliable solution.
In order to fully utilize the land and the space, pier pillars can be arranged in the central separation zone of the road, and the pier pillars are connected with large cantilever capping beams to erect the upper structure of the bridge. At present, the large cantilever cover beam type bridge pier mainly has a steel structure and a prestressed concrete structure. The steel structure pier has light dead weight and quick factory processing, but has the defects of high construction cost and later maintenance cost, instability, fatigue and the like; the prestressed concrete structure pier is low in manufacturing cost, good in moldability and durability and widely applied to engineering, the most common prestressed concrete structure pier is an inverted T hidden capping beam pier which has good visual field and passing clearance, but the prestressed concrete structure pier is only suitable for a simple beam and is not suitable for a continuous beam, the capping beam is high in section and weight, the requirement on construction equipment is high, and the prestressed concrete structure pier is not favorable for rapid construction.
In addition, the top of the existing cover beam is basically planar, and the vertical section of the cover beam is high, so that the passing clearance of a traffic lane below the cover beam is compressed, and the visual field is not wide enough.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a save material, have the mechanics aesthetic feeling, the bridge bottom headroom is big, reducible prestressing loss, be convenient for the inspection, maintain and change, be suitable for the bridge type extensive, improve the big cantilever bent cap formula pier of efficiency of construction.
The purpose of the utility model is realized through the following technical measures: a large cantilever capping beam type pier comprises a capping beam, a pier stud and a foundation, wherein the pier stud is arranged on the foundation, the capping beam is arranged on the top end of the pier stud, the capping beam is a large cantilever capping beam, the large cantilever capping beam comprises a pier top section for setting a first new bridge and two extension sections for setting a second new bridge, the two extension sections are respectively connected to two ends of the pier top section, the top surface of the pier top section is an upward convex curved surface, the top surface of the extension section is a horizontal plane, the top surface of the extension section is lower than the top surface of the pier top section, the bottom surface of the capping beam is an inclined plane which inclines upwards from the pier to two sides, a steel beam is anchored on the capping beam along a transverse bridge direction, the linear shape of the steel beam is an inosculation beam, and the part of the steel beam in the pier top section is an upward convex curved line adaptive to the top surface of the pier top section so as to provide internal prestress, and two ends of the steel bundle respectively penetrate through the pier top section and obliquely extend downwards to the upper part of the extending section and are anchored at the end part of the extending section to provide external prestress.
The utility model discloses the linear bundle that is identical of steel bundle, the whole profile shape of bent cap coincide with the moment of flexure graph under the loading effect, have saved the material, and in addition, the pier wholly seems merrily and lightheartedly penetrating, and the view is better, and the bent cap profile is unanimous with the coordination of internal force line, has increased the mechanics aesthetic feeling. And simultaneously, the utility model discloses a top surface of bent cap is the curved surface, and bent cap cross-section height is low, and the bridge bottom headroom is big, and the field of vision is wide, and space utilization is high, has practiced thrift city soil and space resources. The utility model discloses a lid roof beam prestressing force is taken the external mode that sets up that combines together with internal according to the atress needs to realize the regulation of prestressing force through increasing or reducing steel bundle quantity, reducible prestressing loss is convenient for inspect, maintain and change the prestressing force bundle. In addition, the height of the cross section of the cover beam is low, the weight of a single cover beam is small, the cover beam can be hoisted at one time, the construction speed is accelerated, the construction period is shortened, and the comprehensive benefits of the society and the environment are improved. The utility model discloses it is many to be suitable for the bridge type, including simple beam and continuous beam, add the newly-built double width bridge in track traffic special line and existing old bridge below for double width bridge central authorities, provide the pier scheme that three width of bridges superstructure were arranged according to the article font.
As an improvement of the utility model pre-buried bellows in the mound top section, the both ends of bellows are provided with the connector, the steel beam passes behind bellows and the connector and locates to grout at the both ends of mound top section and seal the anchor.
As the utility model discloses an improve be provided with shockproof dog on the outer end top surface of stretching out the section, the both ends of steel bundle are anchored respectively on two shockproof dogs, the mound top section forms vertical fender face with the combination department of stretching out the section, the new bridge of second is spacing between shockproof dog and vertical fender face, avoids the lateral displacement, prevents that the new bridge of second from dropping under accidental action such as earthquake, striking.
The utility model discloses a change the quantity that penetrates to the steel bundle in the pre-buried bellows and realize the regulation of prestressing force.
As the improvement of the utility model, the steel bundle is located the part cover above the extension section is equipped with the HDPE sleeve pipe.
As the improvement of the utility model, the pier stud is assembled by the prefabricated segment of a plurality of and is constituteed, and the bent cap is prefabricated according to single component, and the two all adopts prefabricated segment to assemble the method construction, has shortened construction cycle greatly.
As the utility model discloses a preferred embodiment, the pier stud is located road central division strip, just the mound top segment is located central division strip, the both ends of bent cap are stretched out respectively to the both sides of road central division strip.
Compared with the prior art, the utility model has the advantages of following showing:
the utility model discloses the linear of steel bundle is for the identical bundle, and the whole profile shape of bent cap is identical with the moment of flexure graph under the load effect, has saved the material, and moreover, the pier wholly seems merrily and lightheartedly penetrating, and the view is better, and the bent cap profile is harmonious unanimous with the internal force line, has added the mechanics aesthetic feeling.
Do a little the utility model discloses a top surface of bent cap is the curved surface, and the bent cap cross-section height is low, and the bridge bottom headroom is big, and the field of vision is wide, and space utilization is high, has practiced thrift city soil and space resources.
The utility model discloses a setting mode that the external and internal combination of body is taken according to the atress needs to the bent cap prestressing force, and the setting mode that the external and internal combination is taken according to the atress needs to the bent cap prestressing force, and the external prestressing force is arranged and is reduced the pipeline and rubbed and hinder the loss, can control and timing steel strand stress, is convenient for detect, maintain and change the prestressed beam; meanwhile, the manufacturing cost is economic, the superiority of the material of the steel bundle under tension and the concrete under compression is fully exerted, and compared with the same type of inverted T hidden bent cap, the concrete material is saved by about 30-50 percent, the dead weight is greatly reduced, and the manufacturing cost can be effectively reduced.
The utility model discloses the bent cap cross-section height is low, and single pin bent cap weight is little, can hoist once, is favorable to accelerating construction speed, shortens the construction period, improves the comprehensive benefits of society and environment.
The utility model discloses it is many to be suitable for the bridge type, including simple beam and continuous roof beam, add track traffic special line and the newly-built double width of cloth bridge in existing old bridge below for double width of cloth bridge central authorities, provide the pier scheme that three width of cloth bridge superstructure was arranged according to the article font.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings.
Fig. 1 is a schematic cross-sectional view of the present invention;
FIG. 2 is a schematic cross-sectional view of the utility model applied to a double bridge with a special track traffic line in the center;
fig. 3 is a schematic cross-sectional view of the present invention, which is suitable for building a new double-width bridge under an existing bridge;
fig. 4 is a schematic side view of the utility model is suitable for a newly-built double width bridge of existing bridge below.
Detailed Description
As shown in fig. 1, the utility model relates to a big cantilever bent cap formula pier, including bent cap 30, pier stud 20 and the basis that from top to bottom sets gradually. In order to save urban land and space resources, pier pillars can be arranged in the central separation zone of the road, and the pier pillars are connected with large cantilever capping beams to erect the upper structure of the bridge, so that the cantilever length of the capping beam 30 is large. When the bent cap 30 is of equal section, the relationship between the bending moment M of the section under the action of dead weight, the weight q per linear meter and the cantilever length l is 1/2ql2The shearing force F is ql, and the bending moment diagram and the shearing diagram are respectively a parabola and an oblique straight line. The closer the capping beam 30 section is to the pier stud 20, the greater the bending moment and shear, and the greater the bending moment of inertia and shear cross-sectional area requirements, so the top and bottom profile shapes of the capping beam 30 can be matched to the internal force under load. Lowering the height of the capping beam 30 facilitates reducing the weight and increasing the clearance at the bottom of the bridge, and also saves material, so that the top and bottom profiles of the capping beam 30 can be arranged in a parabolic and diagonal variation, respectively. The prestress line shape is arranged according to the stress characteristics of the bent cap 30, and the support height of the main beam is highThe external prestress mode is adopted within the range of degree and is arranged according to an inclined straight line; the pier top is arranged in a curve by adopting an in-vivo prestress mode.
The foundation includes a pile foundation 102 and a cap 101 positioned on the pile foundation 102. The pier column 20 is located in the central separation zone, the bottom of the pier column 20 and the bearing platform 101 are poured into a whole, the middle of the bottom of the bent cap 30 is fixedly connected to the top of the pier column 20, and two ends of the bent cap 30 extend out of two sides of the central separation zone respectively. The capping beam 30 comprises a pier top section 301 and extension sections 302 connected at both ends of the pier top section 301. The top surface of the pier top section 301 is an upward convex curved surface, the top surface of the extending section 302 is a horizontal surface, the top surface of the extending section 302 is lower than the top surface of the pier top section 301, the bottom surface of the cap beam 30 is inclined upward from a pier to two sides to form an inclined surface, a plurality of steel bundles 305 are anchored on the cap beam 30, wherein the part of the steel bundles 305 in the pier top section 301 is anchored into an upward convex curve shape matched with the top surface of the pier top section 301 to provide internal prestress, and two ends of the steel bundles 305 penetrate through the pier top section 301 respectively and are inclined downward to extend above the extending section 302 and anchored at the end part of the extending section 302 to provide external prestress.
A plurality of corrugated pipes are embedded in the pier top section 301, connectors are arranged at two ends of the corrugated pipes, and steel bundles 305 penetrate through the corrugated pipes and the connectors and then are grouted and anchored at two ends of the pier top section 301. The number of the embedded corrugated pipes is enough, the number of the anchoring steel bundles 305 depends on the stress condition of the cover beam 30, and the anchoring number of the steel bundles 305 is selected according to the actual condition. The part of the steel bundle 305 above the extension 302 is sleeved with an HDPE sleeve or a hot extruded HDPE for outer protection.
The top surface of the outer end of the extending section 302 is provided with a shockproof stop 303, and two ends of the steel bundle 305 are anchored on the shockproof stop 303. The pier top section 301 and the overhanging section 302 form a vertical stop 304 at the junction.
The pier stud 20 and the bent cap 30 are respectively mainly assembled by a plurality of prefabricated sections, and the pier stud and the bent cap can be constructed by adopting a prefabricated section assembling method, so that the construction period is greatly shortened.
The construction method of the large cantilever cover beam type bridge pier comprises the following steps:
the method comprises the steps of firstly, constructing a foundation part on site, wherein the foundation part comprises a bearing platform 101 and a pile foundation 102;
the pier stud 20 and the capping beam 30 are prefabricated in a factory in a segmented mode, wherein the capping beam 30 is prefabricated according to a single component; and (5) after prefabrication is finished, transporting to a construction site.
Thirdly, assembling the prefabricated section positioned at the bottommost part on the bearing platform 101, and then sequentially assembling other prefabricated sections of the pier column from bottom to top until all the pier columns 20 are assembled;
and fourthly, assembling the hoisting bent cap 30 and the pier stud 20.
Fifthly, a connector is installed at the anchoring position of the top section 301 of the coping 30, the steel bundle 305 penetrates through the corrugated pipe and the connector which are pre-embedded in the top section 301 of the coping 30, and grouting and anchor sealing are carried out after the steel bundle 305 is tensioned, so that internal prestress of the body is provided.
Sixthly, stretching the part of the steel bundle 305 above the extending section 302 and anchoring two ends of the steel bundle 305 on a shockproof stop block 303 to provide external prestress. And when the steel bundle 305 is positioned at the part above the extending section 302, the symmetrical tensioning manner is adopted until the whole pier construction is completed. Wherein, the part of the steel bundle 305 in the pier top section 301 adopts a two-end tensioning mode, and the part of the steel bundle 305 above the extending section 302 adopts a single-end tensioning mode.
The adjustment of the prestress can be achieved by increasing or decreasing the amount of the steel bundles 305 penetrating into the pre-embedded corrugated pipe.
Since the number of the steel bundles 305 is plural, the tensile anchoring can be performed in batches. Moreover, the construction of the upper structure of the bridge should be symmetrically performed to prevent the cap beam 30 from generating a large eccentric bending moment under the constant load.
Please refer to fig. 2, for the utility model is suitable for an embodiment of the central track traffic special line that adds of double width bridge, cushion cap 101 is located below ground 6, in this embodiment, new bridge 402 (the track traffic train 4 that traveles on the bridge floor) is placed on the top surface of mound top section 301, new bridge 401 (the car 5 that traveles on the bridge floor) is placed on the top surface of stretching out section 302, new bridge 401 is restricted between shockproof dog 303 and vertical fender face 304 to avoid lateral displacement, prevent that new bridge 401 from dropping under the accidental action such as earthquake, striking.
Referring to fig. 3 and 4, in order to implement the embodiment of the present invention suitable for newly building a double bridge below an existing bridge, in this embodiment, the pier top section 301 is located right below the existing bridge 7, and the new bridge 401 is placed on the top surface of the extension section 302.
The embodiments of the present invention are not limited to the above, according to the above-mentioned contents of the present invention, according to the common technical knowledge and the conventional means in the field, without departing from the basic technical idea of the present invention, the present invention can also make other modifications, replacements or changes in various forms, all falling within the scope of the present invention.

Claims (7)

1. A large cantilever capping beam type pier comprises a capping beam, a pier stud and a foundation, wherein the pier stud is arranged on the foundation, the capping beam is arranged on the top end of the pier stud, the capping beam is a large cantilever capping beam, the large cantilever capping beam comprises a pier top section for setting a first new bridge and two extension sections for setting a second new bridge, the two extension sections are respectively connected to two ends of the pier top section, the top surface of the pier top section is an upward convex curved surface, the top surface of the extension section is a horizontal plane, the top surface of the extension section is lower than the top surface of the pier top section, the bottom surface of the capping beam is an inclined plane which inclines upwards from the pier to two sides, a steel beam is anchored on the capping beam along a transverse bridge direction, the linear shape of the steel beam is an inosculation beam, and the part of the steel beam in the pier top section is an upward convex curved line adaptive to the top surface of the pier top section so as to provide internal prestress, and two ends of the steel bundle respectively penetrate through the pier top section and obliquely extend downwards to the upper part of the extending section and are anchored at the end part of the extending section to provide external prestress.
2. The large cantilever bent cap pier according to claim 1, wherein: the corrugated pipe is embedded in the pier top section, connectors are arranged at two ends of the corrugated pipe, and the steel bundles penetrate through the corrugated pipe and the connectors and then are grouted and anchored at two ends of the pier top section.
3. The large cantilever bent cap pier according to claim 2, wherein: and the top surface of the outer end of the extending section is provided with a shockproof stop block, two ends of the steel bundle are respectively anchored on the two shockproof stop blocks, the joint of the pier top section and the extending section forms a vertical stop surface, and the second new bridge is limited between the shockproof stop block and the vertical stop surface.
4. The large cantilever bent cap pier according to claim 3, wherein: the prestress can be adjusted by changing the number of the steel bundles penetrating into the embedded corrugated pipe.
5. The large cantilever bent cap pier according to claim 4, wherein: and the part of the steel bundle above the extending section is sleeved with an HDPE sleeve.
6. The large cantilever bent cap pier according to claim 5, wherein: the pier stud is assembled by a plurality of prefabricated sections, and the bent cap is prefabricated according to a single component.
7. The large cantilever bent cap type pier according to any one of claims 1 to 6, wherein: the pier column is located in the central road partition, the pier top section is located in the central road partition, and two ends of the bent cap respectively extend out of two sides of the central road partition.
CN202020389423.8U 2020-03-24 2020-03-24 Large cantilever cover beam type pier Withdrawn - After Issue CN212641180U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202020389423.8U CN212641180U (en) 2020-03-24 2020-03-24 Large cantilever cover beam type pier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202020389423.8U CN212641180U (en) 2020-03-24 2020-03-24 Large cantilever cover beam type pier

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111455830A (en) * 2020-03-24 2020-07-28 广东省交通规划设计研究院股份有限公司 Large cantilever cover beam type bridge pier and construction method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111455830A (en) * 2020-03-24 2020-07-28 广东省交通规划设计研究院股份有限公司 Large cantilever cover beam type bridge pier and construction method thereof
CN111455830B (en) * 2020-03-24 2024-07-02 广东省交通规划设计研究院集团股份有限公司 Large cantilever cover beam type bridge pier and construction method thereof

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Address after: No.146, huangbian North Road, Baiyun District, Guangzhou, Guangdong 510440

Patentee after: Guangdong transportation planning and Design Institute Group Co.,Ltd.

Address before: No.22 Xinghua Road, Tianhe District, Guangzhou City, Guangdong Province

Patentee before: GUANGDONG PROVINCE COMMUNICATIONS PLANNING & DESIGN INSTITUTE Co.,Ltd.

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Granted publication date: 20210302

Effective date of abandoning: 20240702

AV01 Patent right actively abandoned

Granted publication date: 20210302

Effective date of abandoning: 20240702