CN112853947A - Prestress connecting device of railway prefabricated pier - Google Patents

Prestress connecting device of railway prefabricated pier Download PDF

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Publication number
CN112853947A
CN112853947A CN202110304182.1A CN202110304182A CN112853947A CN 112853947 A CN112853947 A CN 112853947A CN 202110304182 A CN202110304182 A CN 202110304182A CN 112853947 A CN112853947 A CN 112853947A
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China
Prior art keywords
prefabricated
prestressed
section
pier body
prefabricated hollow
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CN202110304182.1A
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Inventor
张振钛
徐镭
张予欣
张学斌
袁国涛
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Xinjiang Railway Survey & Design Institute Co ltd
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Xinjiang Railway Survey & Design Institute Co ltd
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Priority to CN202110304182.1A priority Critical patent/CN112853947A/en
Publication of CN112853947A publication Critical patent/CN112853947A/en
Pending legal-status Critical Current

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    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D19/00Structural or constructional details of bridges
    • E01D19/02Piers; Abutments ; Protecting same against drifting ice
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D21/00Methods or apparatus specially adapted for erecting or assembling bridges
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D2101/00Material constitution of bridges
    • E01D2101/20Concrete, stone or stone-like material
    • E01D2101/24Concrete
    • E01D2101/26Concrete reinforced
    • E01D2101/28Concrete reinforced prestressed

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Bridges Or Land Bridges (AREA)

Abstract

The invention discloses a prestress connecting device for a railway prefabricated pier, and particularly relates to a device for pre-anchoring prestress steel bars to a pier foundation and penetrating through a prestressed pore channel of a prefabricated pier and a prefabricated cross beam, applying prestress on a pre-reserved tensioning notch of the prefabricated cross beam through a tensioning prestress steel strand, and finally performing pressure drop and anchor sealing on a prestressed pipeline to complete connection of the prefabricated pier, belonging to the technical field of bridge and culvert engineering. The prestress connecting device of the railway prefabricated pier is a connecting and anchoring system, effectively realizes the connection of a foundation, a pier body and a cross beam, eliminates the crack at the spliced joint by applying prestress, and ensures the durability and the normal use of the pier.

Description

Prestress connecting device of railway prefabricated pier
Technical Field
The invention relates to a prestress connecting device for a railway prefabricated pier, in particular to a device for pre-anchoring prestress steel bars to a pier foundation, penetrating through a prefabricated pier and a prestress pore channel of a prefabricated cross beam, applying prestress on a pre-reserved tensioning notch of the prefabricated cross beam through a tensioning prestress steel strand, and finally performing pressure drop and anchor sealing on the prestress pore channel to complete the connection of the prefabricated pier, belonging to the technical field of bridge and culvert engineering.
Background
The traditional railway pier adopts cast-in-place construction, a large amount of supports, templates and binding reinforcing steel bars need to be erected on a construction site manually, the process is complex, the environmental pollution is high, the construction time is long, the efficiency is low, the construction noise cannot be effectively controlled, the construction equipment and auxiliary facilities need to be repeatedly configured, and the problems of high resource and energy consumption and the like are caused. The railway prefabricated pier construction technology can realize the green construction targets of standardized prefabrication of component factories, on-site mechanical assembly, shortening of construction period and reduction of adverse effects on the environment.
The traditional cast-in-situ bridge pier for the railway is of a concrete structure or a reinforced concrete structure and belongs to an eccentric compression member. The common design idea of the prefabricated assembled railway bridge pier is that the cast-in-place bridge pier is divided into blocks according to the requirements of factory prefabrication and assembly, the blocks are connected in a grouting sleeve, a spigot-and-socket type, a metal corrugated pipe or a high-performance concrete wet joint mode, the connection mode does not change the component type and the stress characteristic of the bridge pier, the splicing joint of the bridge pier is in a tensile state under the action of horizontal force, the concrete cracks, oxygen, water molecules and carbon dioxide in the air invade the cracks, the splicing joint and the bridge pier steel bars generate iron rust through electrochemical reaction (the main components are a mixture of ferric oxide, ferric hydroxide, a small amount of ferrous carbonate and the like), and the volume expansion of the generated iron rust is increased by about 7-. The expansion force caused by volume expansion causes the concrete bonded with the steel bars to crack and peel, and the rust is loose in texture, so that air continuously enters concrete gaps caused by rust expansion, the steel bar corrosion process is aggravated, and the pier body section is continuously reduced from the surface to the inside; the section of the steel bar is continuously reduced from the surface to the inside; the bond strength between the steel bars and the concrete is reduced. The diseases affect the normal use of the bridge pier, and reduce the durability of the bridge pier and the whole service life of the bridge pier.
Disclosure of Invention
The invention aims to provide a prestress connecting device of a railway prefabricated pier, which provides effective connecting and anchoring performance for the railway prefabricated pier.
The invention aims to realize the aim, and the adopted technical scheme is that the prestressed connecting device of the railway prefabricated assembly type pier comprises a single-end tensioning anchor, cast-in-place solid section concrete, embedded steel bars, a prefabricated hollow pier body, a prestressed duct, prestressed steel bars, grouting holes, pier positioning dowels, prefabricated cross beams, cross beam positioning dowels, sealant, a sealing gasket, a mortar cushion layer and a foundation, wherein the embedded steel bars are embedded in the position of the foundation corresponding to the cast-in-place solid section concrete of the hollow pier, the single-end tensioning anchor is embedded in a foundation anchor recess after being provided with the prestressed steel bars, the prestressed steel bars are connected by using steel wires, the first section of the prefabricated hollow pier body is horizontally arranged, the steel wires penetrate into the prestressed duct on the bottom surface of the first section of the prefabricated hollow pier body and are led out from the prestressed duct on the top surface, and the prestressed steel bars are pulled; vertically suspending the prefabricated hollow pier body by using one crane, and drawing prestressed steel bars by using the other crane; pouring a mortar cushion layer on the top surface of the anchor recess, assembling a first section of prefabricated hollow pier body, and adjusting the position of the prefabricated hollow pier body to enable the pier body to be in a horizontal state; horizontally placing the second section of prefabricated hollow pier body, penetrating a steel wire rope into the prestress pore channel on the bottom surface of the second section of prefabricated hollow pier body, leading out the steel wire rope from the prestress pore channel on the top surface, and drawing out prestressed steel bars; vertically suspending a second section of prefabricated hollow pier body by using one crane, and drawing prestressed steel bars by using the other crane; coating sealant on the top surface of the pier body of the first section of prefabricated hollow pier, and installing a sealing washer at the prestressed pore channel of the joint surface; assembling a second section of prefabricated hollow pier body by taking the pier positioning falcon as a reference, and adjusting the position of the second section of prefabricated hollow pier body to enable the second section of prefabricated hollow pier body to be in a horizontal state; penetrating a steel wire rope into the bottom surface prestress pore channel of the prefabricated crossbeam, leading out the steel wire rope from the top surface prestress pore channel, and drawing out a prestress steel bar; vertically suspending the prefabricated beam by using one crane, and drawing the prestressed reinforcement led out from the prestressed pore channel on the top surface of the prefabricated beam by using the other crane; coating sealant on the top surface of the pier body of the second section of prefabricated hollow pier, installing a sealing washer at the prestress pore channel of the joint surface, assembling the cross beam by taking the cross beam positioning tenon as a reference, and adjusting the position of the cross beam to enable the prefabricated cross beam to be in a horizontal state; tensioning prestressed reinforcement and sealing an anchor; pressing mortar into the mortar pressing hole at the bottom of the pier body to seal the prestressed reinforcement; and (5) pouring concrete into the solid section through the grouting hole.
According to the invention, the mortar cushion layer is arranged, so that the first section of prefabricated hollow pier body is closely adhered to the foundation, and the prefabricated hollow pier body is in a horizontal state through adjustment. Through setting up pier location falcon, guarantee the prefabricated hollow mound body accurate positioning of second festival, eliminated the horizontal deviation between the prefabricated hollow mound body, eliminated the annex moment of flexure that the pier body was assembled and is produced. Through setting up prefabricated bent cap location falcon, guaranteed prefabricated crossbeam accurate positioning, eliminated the horizontal deviation of prefabricated crossbeam and the prefabricated hollow mound pier shaft of second section. By arranging the sealing washer, the gap at the prestressed duct of the splicing seam is eliminated, and the prestressed duct is ensured not to leak slurry. Through setting up the grout hole for the solid section concrete is pour to prefabricated hollow mound pier shaft after assembling, has reduced the solid end interference power of hollow mound through pouring solid section concrete, has guaranteed structural safety. The solid section concrete is compensation shrinkage concrete, and the solid section concrete is guaranteed to be closely adhered and bonded with the prefabricated hollow pier, so that the inner wall of the pier at the bottom of the prefabricated hollow pier body is integrated with the post-cast solid section concrete. Through setting up the mud jacking hole, realized prestressed pipe mud jacking, guaranteed prestressing steel and prefabricated hollow pier shaft, prefabricated crossbeam and basis atress in coordination. Through setting up prestressing steel, exert prestressing force to prefabricated hollow pier shaft, make pier shaft cross-section pressurized, eliminate the crack of splice joint, block aggressive substance and invade the pier shaft, guaranteed the durability and the holistic normal use state of pier of splice joint department. By adopting the special hydraulic steel template, the sizes of the prefabricated hollow pier body and the positioning falcon are ensured to meet the requirement of assembly precision. The specially-made hydraulic steel formwork is beneficial to prefabricating the hollow pier and demoulding the positioning tenon inner die. Through adopting embedded steel bar, strengthened cast-in-place entity section concrete and the connection of basis and prefabricated hollow pier shaft, strengthened three's wholeness.
Drawings
The present invention will be described in further detail below with reference to the accompanying drawings.
Fig. 1 is a schematic structural view of the connecting device of the present invention after being disassembled.
Fig. 2 is a schematic structural diagram of the connecting device of the invention after splicing.
Detailed Description
Referring to fig. 1 and 2, the prestress connecting device for the railway prefabricated pier comprises a single-end tensioning anchorage device 1, cast-in-place solid section concrete 2, embedded steel bars 3, a prefabricated hollow pier body 4, a prestress hole channel 5, prestress steel bars 6, grouting holes 7, grouting holes 8, pier positioning dowels 9, prefabricated cross beams 10, cross beam positioning dowels 11, sealing glue 12, sealing gaskets 13, mortar cushion layers 14 and a foundation 15. The embedded steel bars 3 are embedded in the part, corresponding to the cast-in-place solid section concrete 2, of the prefabricated hollow pier body 4 of the foundation 15, the single-end tensioning anchorage device 1 is embedded in an anchor socket of the foundation after being provided with the prestressed steel bars 6 and is connected with the prestressed steel bars 6 through steel wire ropes, the first prefabricated hollow pier body 4 is horizontally arranged, the steel wire ropes penetrate into the prestressed pore channels 5 on the bottom surface of the first prefabricated hollow pier body 6 and are led out from the prestressed pore channels 5 on the top surface, and the prestressed steel bars 6 are pulled out; vertically suspending a prefabricated hollow pier body 4 by using one crane, and drawing prestressed reinforcement 6 by using the other crane; pouring a mortar cushion layer 14 on the top surface of the anchor recess, assembling the first section of prefabricated hollow pier body 4, and adjusting the position of the first section of prefabricated hollow pier body 4 to enable the first section of prefabricated hollow pier body 4 to be in a horizontal state; horizontally placing a second section of prefabricated hollow pier body 4, penetrating a steel wire rope into a prestress pore channel 5 at the bottom surface of the second section of prefabricated hollow pier body 4, leading out the steel wire rope from the prestress pore channel 5 at the top surface, and drawing out a prestress steel bar 6; vertically suspending a second section of prefabricated hollow pier body 4 by using one crane, and drawing prestressed reinforcement 6 by using the other crane; coating a sealant 12 on the top surface of the first section of prefabricated hollow pier body 4, and installing a sealing washer 13 at the position of the joint surface prestress pore channel 5; assembling the second section of prefabricated hollow pier body 4 by taking the pier positioning falcon 9 as a reference, and adjusting the position of the second section of prefabricated hollow pier body 4 to enable the second section of prefabricated hollow pier body 4 to be in a horizontal state; penetrating a steel wire rope into the bottom prestressed duct 5 of the prefabricated beam 10, leading out the top prestressed duct 5 and drawing out a prestressed steel bar 6; vertically suspending the prefabricated beam 10 by using one crane, and drawing the prestressed reinforcement 6 led out from the prestressed pore channel 5 on the top surface of the prefabricated beam 10 by using the other crane; coating a sealant 12 on the top surface of the second section of the prefabricated hollow pier body 4, installing a sealing washer 13 at the joint surface prestress pore channel 5, assembling the prefabricated cross beam 10 by taking the cross beam positioning tenon 11 as a reference, and adjusting the position to enable the prefabricated cross beam 10 to be in a horizontal state; tensioning the prestressed reinforcement 6 and sealing the anchor; the mortar pressing hole 8 is positioned at the lower part of the pier body 4, mortar is pressed in through the mortar pressing hole 8, and the prestressed reinforcement 6 is sealed; the grouting holes 7 are located above the grouting holes 8 and are filled with the solid section concrete 2 through the grouting holes 7, and the pier positioning falcon 9 is vertically arranged at intervals and prefabricated with the prefabricated hollow pier body 4 at the same time; the beam positioning tenons 11 are prefabricated simultaneously with the erection of the prefabricated beams 10.
The prefabricated hollow pier body 4 is made of high-performance concrete, and the high-performance concrete meets the regulations of the existing industry regulation 'high-performance concrete application technical regulation' (CECS 207), the existing industry regulation 'railway concrete' (TB/T3275) and the 'railway concrete structure durability design regulation' (TB 10005).
The mortar cushion layer 14 is made of high-strength non-shrinkage mortar, the 28d compressive strength of the mortar cushion layer is not less than 60MPa and is higher than the strength grade of a connected member by one grade (7MPa), and the material strength of a joint is ensured; the mortar cushion layer is preferably made of medium sand which is hard in texture and good in gradation, the fineness modulus is not less than 2.6, the 28d vertical expansion rate is controlled to be 0.02-0.10%, the volume stability of the joint material is ensured, and the prestress loss is effectively reduced; the initial setting time of the mortar cushion layer 14 is preferably longer than 2h, the installation operation time of the prefabricated hollow pier body 4 is ensured, and the installation precision is ensured. The characteristics all guarantee the high durability and the structural safety of the seam of the prefabricated assembly type railway pier.
The extrudability and chemical stability of the sealant 12 are measured before construction, and the test method and various technical standards of the sealant 12 meet the requirements of the existing industry standard of temporary technical conditions for prefabricating and assembling simple supported beams of prestressed concrete sections for railways (TJ/GW 162). The sealant 12 is easy to coat and scrape without sagging during construction, and has good aging resistance and strong alkali corrosion resistance.
The standard strength of the prestressed reinforcement 6 is 1860 MPa.

Claims (3)

1. The utility model provides a prestressing force connecting device of prefabricated assembled pier of railway, includes single-end stretch-draw ground tackle (1), cast-in-place entity section concrete (2), embedded bar (3), prefabricated hollow pier shaft (4), prestressing force pore canal (5), prestressing steel (6), grout hole (7), grout pressing hole (8), pier location falcon (9), prefabricated crossbeam (10), crossbeam location falcon (11), sealed glue (12), seal ring (13), mortar bed course (14), basis (15), characterized by: the method comprises the following steps that pre-embedded steel bars (3) are pre-embedded at the position, corresponding to a prefabricated hollow pier body (4), of a foundation, solid concrete (2) is cast in place, a single-end tensioning anchorage device (1) is pre-embedded in an anchor socket of the foundation after being provided with prestressed steel bars (6), the prestressed steel bars (6) are connected through steel wire ropes, the first prefabricated hollow pier body (4) is horizontally arranged, the steel wire ropes penetrate into prestressed pore channels (5) on the bottom surface of the first prefabricated hollow pier body (4), are led out from the prestressed pore channels (5) on the top surface, and are pulled out of the prestressed steel bars (6); vertically suspending a prefabricated hollow pier body (4) by using one crane, and drawing prestressed steel bars (6) by using the other crane; pouring a mortar cushion layer (14) on the top surface of the anchor recess, assembling a first section of prefabricated hollow pier body (4), and adjusting the position of the first section of prefabricated hollow pier body to enable the first section of prefabricated hollow pier body (4) to be in a horizontal state; horizontally placing the second section of the prefabricated hollow pier body (4), penetrating a steel wire rope into the bottom surface prestress pore channel (5) of the second section of the prefabricated hollow pier body (4), leading out the steel wire rope from the top surface prestress pore channel (5), and drawing out a prestress steel bar (6); vertically suspending a second section of prefabricated hollow pier body (4) by using one crane, and drawing prestressed steel bars (6) by using the other crane; coating a sealant (12) on the top surface of the first section of prefabricated hollow pier body (4), and installing a sealing washer (13) at the position of the joint surface prestress pore channel (5); assembling the second section of prefabricated hollow pier body (4) by taking the pier positioning falcon (9) as a reference, and adjusting the position of the second section of prefabricated hollow pier body to enable the second section of prefabricated hollow pier body (4) to be in a horizontal state; penetrating a steel wire rope into the bottom prestressed duct (5) of the prefabricated beam (10), leading out the steel wire rope from the top prestressed duct (5), and drawing out a prestressed steel bar (6); vertically suspending the prefabricated beam (10) by using one crane, and drawing the prestressed reinforcement (6) led out from the prestressed pore channel (5) on the top surface of the prefabricated beam (10) by using the other crane; coating a sealant (12) on the top surface of the second section of prefabricated hollow pier body (4), installing a sealing washer (13) at the position of a joint surface prestress pore channel (5), assembling the prefabricated cross beam (10) by taking the cross beam positioning falcon (11) as a reference, and adjusting the position to enable the prefabricated cross beam (10) to be in a horizontal state; tensioning the prestressed reinforcement (6) and sealing the anchor; the mortar pressing hole (8) is positioned at the lower part of the pier body (4) and mortar is pressed in through the mortar pressing hole (8) to seal the prestressed reinforcement (6); the grouting holes (7) are positioned above the grouting holes (8) and filled with the solid section concrete (2) through the grouting holes (7), and the pier positioning falcons (9) are vertically arranged at intervals and prefabricated with the prefabricated hollow pier bodies (4) at the same time; crossbeam location falcon (11) prefabricate simultaneously with assembling prefabricated crossbeam (10).
2. The prestressed connecting device of a prefabricated assembled railway pier of claim 1, wherein: the mortar cushion layer (14) is made of high-strength shrinkage-free mortar, the 28d compressive strength of the mortar cushion layer is not less than 60MPa and is 7MPa higher than the strength grade of a connected member, the mortar cushion layer is made of medium sand with hard texture and good gradation, the fineness modulus is not less than 2.6, the 28d vertical expansion rate is controlled to be 0.02-0.10%, and the initial setting time of the mortar cushion layer (14) is more than 2 hours.
3. The prestressed connecting device of a prefabricated assembled railway pier of claim 1, wherein: the standard strength of the prestressed reinforcement (6) is 1860 MPa.
CN202110304182.1A 2021-03-22 2021-03-22 Prestress connecting device of railway prefabricated pier Pending CN112853947A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110304182.1A CN112853947A (en) 2021-03-22 2021-03-22 Prestress connecting device of railway prefabricated pier

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Application Number Priority Date Filing Date Title
CN202110304182.1A CN112853947A (en) 2021-03-22 2021-03-22 Prestress connecting device of railway prefabricated pier

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CN112853947A true CN112853947A (en) 2021-05-28

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113818352A (en) * 2021-09-29 2021-12-21 湖南交通国际经济工程合作有限公司 Soft foundation high pier curve cast-in-situ box girder bridge and construction method thereof
CN115075146A (en) * 2022-07-22 2022-09-20 北京城建设计发展集团股份有限公司 Method for connecting prefabricated capping beam through prestressed tendons and steel bars

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113818352A (en) * 2021-09-29 2021-12-21 湖南交通国际经济工程合作有限公司 Soft foundation high pier curve cast-in-situ box girder bridge and construction method thereof
CN115075146A (en) * 2022-07-22 2022-09-20 北京城建设计发展集团股份有限公司 Method for connecting prefabricated capping beam through prestressed tendons and steel bars
CN115075146B (en) * 2022-07-22 2023-04-07 北京城建设计发展集团股份有限公司 Method for connecting prefabricated bent cap through prestressed tendons and steel bars

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