CN116517191A - Mixed reinforcement precast concrete column with spiral stirrup core column and assembly method thereof - Google Patents
Mixed reinforcement precast concrete column with spiral stirrup core column and assembly method thereof Download PDFInfo
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- CN116517191A CN116517191A CN202310780533.5A CN202310780533A CN116517191A CN 116517191 A CN116517191 A CN 116517191A CN 202310780533 A CN202310780533 A CN 202310780533A CN 116517191 A CN116517191 A CN 116517191A
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- 239000011178 precast concrete Substances 0.000 title claims abstract description 140
- 230000002787 reinforcement Effects 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 12
- 239000011374 ultra-high-performance concrete Substances 0.000 claims abstract description 37
- 239000004567 concrete Substances 0.000 claims abstract description 29
- 239000011151 fibre-reinforced plastic Substances 0.000 claims description 81
- 229910000831 Steel Inorganic materials 0.000 claims description 38
- 239000010959 steel Substances 0.000 claims description 38
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 34
- 230000003014 reinforcing effect Effects 0.000 claims description 5
- 238000003466 welding Methods 0.000 claims description 5
- 239000004918 carbon fiber reinforced polymer Substances 0.000 claims description 4
- 239000011152 fibreglass Substances 0.000 claims description 4
- 241001270131 Agaricus moelleri Species 0.000 claims description 3
- 229920002748 Basalt fiber Polymers 0.000 claims description 3
- 102100024452 DNA-directed RNA polymerase III subunit RPC1 Human genes 0.000 claims description 3
- 101000689002 Homo sapiens DNA-directed RNA polymerase III subunit RPC1 Proteins 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000007788 roughening Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 11
- 229920002430 Fibre-reinforced plastic Polymers 0.000 description 78
- 238000010276 construction Methods 0.000 description 9
- 230000007797 corrosion Effects 0.000 description 6
- 238000005260 corrosion Methods 0.000 description 6
- 230000008901 benefit Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000011150 reinforced concrete Substances 0.000 description 3
- 238000005266 casting Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000000452 restraining effect Effects 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 238000003491 array Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/30—Columns; Pillars; Struts
- E04C3/34—Columns; Pillars; Struts of concrete other stone-like material, with or without permanent form elements, with or without internal or external reinforcement, e.g. metal coverings
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/38—Connections for building structures in general
- E04B1/58—Connections for building structures in general of bar-shaped building elements
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/92—Protection against other undesired influences or dangers
- E04B1/98—Protection against other undesired influences or dangers against vibrations or shocks; against mechanical destruction, e.g. by air-raids
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/14—Conveying or assembling building elements
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
- E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
- E04H9/021—Bearing, supporting or connecting constructions specially adapted for such buildings
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
- E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
- E04H9/025—Structures with concrete columns
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Mechanical Engineering (AREA)
- Reinforcement Elements For Buildings (AREA)
- Rod-Shaped Construction Members (AREA)
Abstract
The invention discloses a mixed reinforcement precast concrete column with a spiral stirrup core column and an assembly method thereof, and belongs to the field of underground or underwater structures. The shear force and the axial force can be effectively transmitted through the ultra-high performance concrete pouring connection area, the bearing capacity of the column is improved, and the deformation capacity of the column is ensured. In addition, the prefabricated concrete column and the connecting component can be prefabricated and processed in factories and assembled on site; on the basis of guaranteeing connection strength and quality, the length of the splicing section of the rib material can be shortened by adopting ultra-high-performance concrete, the consumption of the rib material is reduced, the cost is saved, and the assembly efficiency is improved.
Description
Technical Field
The invention relates to the field of underground or underwater structures, in particular to a mixed reinforcement precast concrete column with a spiral stirrup core column and an assembly method thereof, which are suitable for underground or underwater corrosive environments.
Background
At present, the reinforced concrete structure is greatly influenced by environmental corrosion, and for underground or underwater structures, seawater, salt lake water, deicing salt, saline soil and the like can have higher corrosiveness, so that different degrees of corrosion effects are generated on the reinforced concrete.
Patent document CN105442590a discloses an active powder concrete casing concrete column, which adopts Fiber Reinforced Plastic (FRP) bars to replace reinforcing steel bars, so that the problem of reinforcing steel bar corrosion can be well solved, but the Fiber Reinforced Plastic (FRP) bar concrete structure has poor ductility and relatively weak earthquake resistance. Therefore, the ductility performance of the Fiber Reinforced Plastic (FRP) bar-steel bar mixed reinforcement can be effectively improved.
Patent document CN114004085a discloses a FRP composite spiral stirrup constraint concrete column, adopts the square stirrup of inside FRP spiral stirrup and outside FRP, and the longitudinal reinforcement adopts selecting reinforcement, FRP and reinforcing bar mixed reinforcement and full FRP longitudinal reinforcement, and outside longitudinal reinforcement and the square stirrup of outside are nearest to concrete surface, suffer from the environmental corrosion first in actual engineering, adopt outside FRP longitudinal reinforcement and the square stirrup effect of outside better, and inside spiral stirrup and inside longitudinal reinforcement are far away from concrete surface and full FRP reinforcement component ductility and shock resistance are relatively poor. In addition, the FRP composite spiral stirrup constraint concrete column is fixed in size, but not assembled, and the practicability is poor.
The prefabricated building structure can be divided into two main types according to the different node connection construction modes: dry connections and wet connections. The dry connection is generally performed by welding, bolts, or the like. The connection of the steel bar welding and the steel plate welding easily causes stress concentration, and the stress mode of the prefabricated frame column is changed; the prefabricated frame column-column node dry connection mode has the advantages of complex structure, more embedded parts, inconvenient construction and higher manufacturing cost. The main modes of wet connection are slurry anchor connection, mortar connection and sleeve connection. When the wet-type connection prefabricated assembly type structure is adopted, the working procedure is complex, the connection nodes also need time maintenance, the quick construction is not facilitated, the reserved steel bars of the components are too long, the transportation is not facilitated, and the waste of the steel bars and the increase of the material cost are caused.
Therefore, the invention provides a novel prefabricated frame column-column connection mode, namely a mixed reinforcement prefabricated concrete column with a spiral stirrup core column, and an assembly method on the basis of integrating a plurality of prefabricated frame column-column connection modes.
Disclosure of Invention
The invention aims to provide a mixed reinforcement precast concrete column with a spiral stirrup core column and an assembly method thereof, wherein an upper precast concrete column and a lower precast concrete column are vertically overlapped, a vertical diagonal bracing reinforcement connecting column body achieves the aim of supporting an upper precast concrete column shaft, additional stirrups are arranged at intervals to be connected with longitudinal ribs to play a role of restraining a connecting node core column, finally Ultra-high performance concrete (Ultra-High Performance Concrete, UHPC) is poured in a connecting area to complete splicing of the precast concrete column, the problems that an existing underwater or underground reinforced concrete structure is easy to be corroded by salt, the problem that the existing FRP reinforcement concrete column is poor in ductility and the problem that the existing FRP-reinforcement mixed reinforcement concrete column is complex to connect and difficult to guarantee construction quality are solved, the precast concrete column is guaranteed to have excellent durability, stress performance and deformation performance, and meanwhile construction efficiency is improved.
In order to achieve the above object, the technical scheme of the present invention is as follows:
on one hand, the invention provides a mixed reinforcement precast concrete column with a spiral stirrup core column, which comprises an upper precast concrete column, a lower precast concrete column, post-cast area additional stirrups, vertical diagonal bracing steel bars and post-cast UHPC connecting parts; wherein:
the upper precast concrete column is a lower convex column body, a first FRP stirrup, a first FRP longitudinal bar, a first steel bar longitudinal bar and a first spiral stirrup are arranged in the upper precast concrete column, and the first FRP longitudinal bar is positioned at the edge of the column body and bound and fixed by the first FRP stirrup; the first steel bar longitudinal bars are positioned in the center of the column body and are bound and fixed by the first spiral stirrups to form a first spiral stirrup core column; the first FRP longitudinal ribs protrude out of the lower surface of the upper precast concrete column, the first steel bar longitudinal ribs protrude out of the lower convex surface of the upper precast concrete column and are flush with the lower ends of the first FRP longitudinal ribs, and the cross section of the lower convex shape is circular;
the lower precast concrete column is a flat-top column, and is internally provided with a second FRP stirrup, a second FRP longitudinal bar, a second steel bar longitudinal bar and a second spiral stirrup, wherein the second FRP longitudinal bar is positioned at the edge of the column and is bound and fixed by the second FRP stirrup; the second steel bar longitudinal bars are positioned in the center of the column body and are bound and fixed by the second spiral stirrups to form a second spiral stirrup core column; the second FRP longitudinal bars and the second reinforcing steel bar longitudinal bars are protruded out of the upper surface of the lower precast concrete column, and the upper ends of the second FRP longitudinal bars are higher than the second reinforcing steel bar longitudinal bars;
the upper precast concrete column and the lower precast concrete column are connected and supported through the vertical diagonal bracing steel bars, the lower end of the first FRP longitudinal bar is overlapped with the upper end of the second FRP longitudinal bar, then reinforcing and connecting are carried out through the additional stirrups of the post-cast area, at the moment, a connecting area is formed between the upper precast concrete column and the lower precast concrete column, a post-cast UHPC connecting part is formed in the connecting area through casting UHPC, and then the upper precast concrete column is connected with the lower precast concrete column.
Further, the upper precast concrete column and the lower precast concrete column are made of common concrete with the strength grade between C35 and C80.
Further, the post-cast UHPC connecting part adopts ultra-high performance concrete with the strength grade between C100 and C160.
Further, the post-cast area additional stirrup comprises an FRP additional stirrup and a reinforcing steel bar additional stirrup, the first FRP longitudinal bars and the second FRP longitudinal bars are vertically staggered and stacked and connected through the FRP additional stirrup, and the first reinforcing steel bar longitudinal bars and the second reinforcing steel bar longitudinal bars are vertically staggered and stacked and connected through the reinforcing steel bar additional stirrup.
Further, the FRP additional stirrup and the steel bar additional stirrup are closed stirrups or spiral stirrups, are in a multi-limb hooping mode, and are uniformly distributed along the axial direction of the column body.
Further, the first FRP longitudinal bars, the first reinforcing steel bars, the second FRP longitudinal bars and the second reinforcing steel bars are all arranged into a plurality of circumferentially distributed arrays.
Further, the first FRP stirrup and the second FRP stirrup are closed stirrups or spiral stirrups, are in a multi-limb hoop mode, and are uniformly distributed along the axial direction of the column body.
Further, the lap joint length of the first FRP longitudinal ribs and the second FRP longitudinal ribs is 15dm-20dm; the overlap joint length of the first longitudinal steel bar and the second longitudinal steel bar is 5dm-8dm.
Further, the first FRP longitudinal rib and the second FRP longitudinal rib adopt one of glass fiber reinforced plastic rib materials, basalt fiber reinforced plastic rib materials and carbon fiber reinforced plastic rib materials.
In a first aspect, the present invention also provides a method for assembling a hybrid reinforced precast concrete column with a spiral stirrup core column as set forth in any one of the above, comprising the steps of:
s1, prefabricating an upper precast concrete column, a lower precast concrete column and additional stirrups in a post-pouring area in a factory, and roughening the bottoms of the upper precast concrete column and the tops of the lower precast concrete column;
s2, sequentially penetrating additional stirrups of the post-cast area from top to bottom through the outer sides of longitudinal ribs extending out of the lower precast concrete column;
s3, vertically hoisting an upper precast concrete column, stacking the upper precast concrete column and a lower precast concrete column up and down, aligning and leveling the central lines of the upper column and the lower column, and welding vertical diagonal bracing steel bars on four sides of reserved longitudinal bars of the first spiral stirrup core column to temporarily support the column shaft of the upper precast concrete column; then binding and fixing the vertical bars which are overlapped up and down and extend out of the precast concrete column by using the sleeved additional stirrups of the post-pouring area;
s4, cleaning a connecting area, erecting a template in the connecting area, reserving a pouring opening, pouring ultra-high performance concrete, and removing the template after the concrete is hardened, wherein a post-pouring UHPC connecting part is formed between the upper precast concrete column and the lower precast concrete column, so that the assembly of the mixed reinforcement precast concrete column with the spiral stirrup core column is completed.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the mixed reinforcement precast concrete column with the spiral reinforcement core column and the assembly method thereof, the spiral reinforcement core column is formed inside the column by adopting the inner reinforcement longitudinal bars and the inner reinforcement spiral reinforcement, so that the ductility performance of the column is ensured, the FRP reinforcement materials are adopted for the column outer longitudinal bars and the outer square reinforcement, corrosion of the reinforcement materials can not occur even if chloride ion permeation occurs, corrosion damage of the column can be delayed, meanwhile, the combined structure of the FRP reinforcement-reinforcement mixed reinforcement and a UHPC connection node is formed by matching with the utilization of ultra-high performance concrete (UHPC), the problem that concrete is corroded can be further solved, the durability and the stress performance of an underground or underwater structure can be effectively improved, and the mixed reinforcement precast concrete column is suitable for underground or underwater corroded environments. 2. Compared with the traditional concrete, the ultra-high performance concrete (UHPC) has high strength, high compactness, excellent durability and high toughness, so that the lap joint length of the reserved reinforcing steel bars is shortened, the lap joint length can be shortened to 10 times of the diameter of the reserved reinforcing steel bars from 35 times of the diameter of the existing reserved reinforcing steel bars, the lengths of different types of longitudinal bars of the prefabricated columns can be reserved reasonably, the ultra-high performance concrete (UHPC) is used for pouring a connecting area, the purpose of shortening the length of the lap joint connecting section of the reinforcing steel bars on the basis of ensuring the connecting strength and the quality is realized, the consumption of the reinforcing steel bars is reduced, the cost is saved, the construction efficiency is improved, the shearing force and the axial force can be effectively transmitted, the bearing capacity of the column is improved, the deformation capacity of the column is guaranteed, and the prefabricated column with excellent bearing performance and anti-seismic performance is formed. 3. The invention adopts an assembled concrete structure and has the advantages of high construction efficiency, low environmental pollution, low energy consumption, obvious economic benefit and the like.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings may be obtained according to these drawings for a person having ordinary skill in the art.
FIG. 1 is a schematic plan view of a precast concrete column and assembly of the present invention;
FIG. 2 is a schematic plan view of an upper precast concrete column of the present invention;
FIG. 3 is a schematic plan view of a lower precast concrete column of the present invention;
FIG. 4 is a schematic plan view of the post-cast region additional stirrup of the present invention;
FIG. 5 is a schematic longitudinal cross-sectional view of a post-cast UHPC of the present invention.
Reference numerals illustrate:
1. an upper precast concrete column; 11. the first FRP stirrup; 12. a first FRP longitudinal bar; 13. a first reinforcing steel bar longitudinal bar; 14. a first helical stirrup; 2. a lower precast concrete column; 21. the second FRP stirrup; 22. second FRP longitudinal ribs; 23. a second reinforcing steel bar longitudinal bar; 24. a second helical stirrup; 3. adding stirrups in the post-pouring area; 31. FRP additional stirrups; 32. reinforcing steel bars are added with stirrups; 4. vertical diagonal bracing steel bars; 5. post-cast UHPC connection.
Detailed Description
In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be described in further detail with reference to examples and drawings. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The experimental methods in the following examples are conventional methods unless otherwise specified. The test materials used in the examples described below, unless otherwise specified, were purchased from conventional biochemical reagent stores.
Example 1
The invention provides a mixed reinforcement precast concrete column with a spiral stirrup core column, which comprises an upper precast concrete column 1, a lower precast concrete column 2, post-cast area additional stirrups 3, vertical diagonal bracing steel bars 4 and post-cast UHPC connecting parts 5, and is described with reference to figures 1-5. Wherein: the upper precast concrete column 1 and the lower precast concrete column 2 can adopt common concrete with the strength grade between C35 and C80 according to design requirements. The post-cast UHPC connecting part 5 can adopt ultra-high performance concrete (UHPC) with the strength grade between C100 and C160 according to design requirements. Compared with the traditional concrete, the ultra-high performance concrete has high strength, high compactness, excellent durability and high toughness.
As shown in fig. 2, the upper precast concrete column 1 is a lower convex column, and is internally provided with a first FRP stirrup 11, a first FRP longitudinal bar 12, a first reinforcing bar longitudinal bar 13 and a first spiral stirrup 14, wherein the first FRP longitudinal bar 12 is positioned at the edge of the column and is bound and fixed by the first FRP stirrup 11; the first steel bar longitudinal bar 13 is positioned in the center of the column body and is bound and fixed by the first spiral stirrup 14 to form a first spiral stirrup core column; the first FRP longitudinal ribs 12 protrude out of the lower surface of the upper precast concrete column 1, the first steel bar longitudinal ribs 13 protrude out of the lower convex surface of the upper precast concrete column and are flush with the lower ends of the first FRP longitudinal ribs 12, and the cross section shape of the lower convex is circular.
As shown in fig. 3, the lower precast concrete column 2 is a flat top column, and is internally provided with a second FRP stirrup 21, a second FRP longitudinal bar 22, a second reinforcing bar longitudinal bar 23 and a second spiral stirrup 24, wherein the second FRP longitudinal bar 22 is positioned at the edge of the column and is bound and fixed by the second FRP stirrup 21; the second longitudinal reinforcement bar 23 is positioned in the center of the column and is bound and fixed by the second spiral stirrup 24 to form a second spiral stirrup core column; the second FRP longitudinal bars 22 and the second reinforcing steel bar longitudinal bars 23 are protruded out of the upper surface of the lower precast concrete column 2, and the upper ends of the second FRP longitudinal bars 22 are higher than the second reinforcing steel bar longitudinal bars 23.
Specifically, the first FRP longitudinal ribs 12, the first reinforcing steel bar longitudinal ribs 13, the second FRP longitudinal ribs 22 and the second reinforcing steel bar longitudinal ribs 23 are all arranged as a plurality of circumferentially arrayed and distributed bars. The first FRP stirrup 11 and the second FRP stirrup 21 are closed stirrups or spiral stirrups, are in a multi-limb hooping mode, and are uniformly distributed along the axial direction of the column body. The first and second FRP longitudinal ribs 12 and 22 are one of Glass Fiber Reinforced Plastic (GFRP) ribs, basalt Fiber Reinforced Plastic (BFRP) ribs and Carbon Fiber Reinforced Plastic (CFRP) ribs.
The upper precast concrete column 1 and the lower precast concrete column 2 are connected and supported through the vertical diagonal bracing steel bars 4, the lower end of the first FRP longitudinal bar 12 is overlapped with the upper end of the second FRP longitudinal bar 22, the lower end of the first FRP longitudinal bar 13 is overlapped with the upper end of the second FRP longitudinal bar 23, and specifically, the overlapping length of the first FRP longitudinal bar 12 and the second FRP longitudinal bar 22 is 15dm-20dm; the overlap length of the first longitudinal reinforcement 13 and the second longitudinal reinforcement 23 is 5dm-8dm. Because UHPC is adopted, compared with the traditional concrete, the UHPC has high strength, high compactness, excellent durability and high toughness, so that the lap joint length of the reserved steel bars is shortened, and the lap joint length can be shortened from 35 times of the diameter of the original reserved steel bars to 10 times of the diameter of the reserved steel bars.
Then, reinforcement connection is performed through the post-cast area additional stirrup 3, specifically, as shown in fig. 4, the post-cast area additional stirrup 3 includes an FRP additional stirrup 31 and a reinforcing steel bar additional stirrup 32, the first FRP longitudinal bars 12 and the second FRP longitudinal bars 22 are stacked up and down in a staggered manner and are connected through the FRP additional stirrup 31, and the first reinforcing steel bar longitudinal bars 13 and the second reinforcing steel bar longitudinal bars 23 are stacked up and down in a staggered manner and are connected through the reinforcing steel bar additional stirrup 32. The FRP additional stirrup 31 and the steel bar additional stirrup 32 are closed stirrups or spiral stirrups, are in a multi-limb hooping mode, and are uniformly distributed along the axial direction of the column body.
At this time, a connection area is formed between the upper precast concrete column 1 and the lower precast concrete column 2, and a post-cast UHPC connection part 5 is formed by casting UHPC in the connection area, as shown in fig. 5, so that the upper precast concrete column 1 and the lower precast concrete column 2 are connected.
Example two
The invention provides an assembly method of the mixed reinforcement precast concrete column with the spiral stirrup core column, which comprises the following steps:
s1, prefabricating an upper precast concrete column 1, a lower precast concrete column 2 and additional stirrups 3 in a post-cast area in a factory, and roughening the bottom of the upper precast concrete column 1 and the top of the lower precast concrete column 2;
s2, sequentially penetrating the additional stirrups 3 of the post-cast area from top to bottom through the outer sides of the longitudinal ribs extending out of the lower precast concrete column 2;
s3, vertically hoisting the upper precast concrete column 1 (before hoisting the upper precast concrete column 1, checking whether a hoisting ring in an embedded member is intact, and ensuring correct specification, model and position, wherein the upper precast concrete column 1 is not more than 0.5m from the ground when in test hoisting, the hoisting of the upper precast concrete column 1 should be performed in a slow hoisting, fast hoisting and slow releasing operation mode, the hoisting should be sequentially and gradually increased in speed and should not be performed in a gear-crossing operation mode), and when the upper precast concrete column 1 is hoisted and descends, mooring a cable rope at the root of the column so as to control the rotation of the column, thereby ensuring that the column is in place stably; the upper precast concrete column 1 and the lower precast concrete column 2 are vertically stacked, a gap of 20mm is kept between the bottom of a spiral stirrup core column of the upper precast concrete column 1 and the top of the lower precast concrete column 2, cushion blocks with different thicknesses of 10-20 mm are used in the gap, the vertical components are ensured to be installed in place and conform to the design elevation, when the upper precast concrete column 1 is about 1.5m away from the lower precast concrete column 2, the upper precast concrete column 1 is adjusted to the installation position at a low speed, and when the upper precast concrete column 1 is about 30cm away from the lower precast concrete column 2, an installer is assisted to lightly push the main body or a crowbar is adopted to perform preliminary positioning according to the positioning line. After the upper precast concrete columns 1 are basically positioned according to the axes, component side lines and measurement control lines, the upper precast concrete columns 1 are temporarily fixed by utilizing adjustable inclined supports, each upper precast concrete column 1 is fixed by using at least 2 inclined supports, the inclined supports are arranged on the same side of the whole body, and the horizontal included angle between each inclined support and the vertical surface is not smaller than 60 degrees. The installer rotates the diagonal bracing to enable the upper precast concrete column 1 and the lower precast concrete column 2 to keep basically vertical, measures vertical deviation on the side face of the column by using the guiding rule, accurately corrects the column verticality by using the plumb bob or the level bar, and finely adjusts the middle steel tube of the rotation adjustable diagonal bracing until the upper precast concrete column 1 ensures the verticality. And correcting the flatness between planes of the prefabricated columns by using a 2m long guiding rule and a feeler gauge, so as to ensure that the flatness of the column axes and the column surfaces meets the quality requirement. After the central lines of the upper precast concrete column 1 and the lower precast concrete column 2 are aligned and leveled, vertical diagonal bracing steel bars 4 are welded on four sides of reserved longitudinal bars of the first spiral stirrup core column to temporarily support the column shaft of the upper precast concrete column 1, so that additional stirrups in the post-pouring area are conveniently arranged to be connected with the longitudinal bars; then binding and fixing the vertical bars which extend out of the precast concrete column and are overlapped up and down by using the sleeved post-pouring area additional stirrups 3; the post-cast area additional stirrups 3 are arranged at intervals along the vertical direction of the longitudinal stirrups, and then the FRP additional stirrups 31 and the reinforcing steel bar additional stirrups 32 are bound successively. S4, cleaning a connecting area, namely, a roughened cylindrical surface, reserved longitudinal ribs and post-cast area additional stirrups 3, then erecting a template at the connecting area, leaving a pouring port, pouring ultra-high performance concrete, removing the mould after the concrete is hardened, and forming a post-cast UHPC connecting part 5 between the upper precast concrete column 1 and the lower precast concrete column 2 at the moment, so as to complete the assembly of the mixed reinforcement precast concrete column with the spiral stirrup core column.
In the scheme disclosed by the embodiment of the invention, the longitudinal ribs of the upper precast concrete column 1 and the lower precast concrete column 2 are vertically overlapped, the purpose of supporting the column body of the upper precast concrete column is achieved by connecting the columns through the vertical diagonal bracing steel bars, the additional stirrups are arranged at intervals to strengthen the connection of the longitudinal ribs, so that the effect of restraining transverse shearing force is achieved, and finally, ultra-high performance concrete (UHPC) is poured in a connecting area to finish the splicing of the precast concrete columns. The prefabricated concrete column and the connecting member can be prefabricated and processed in factories, so that the on-site installation and construction are facilitated, and the construction speed is improved. The mixed reinforcement precast concrete column with the built-in spiral stirrup core column provided by the invention shortens the length of the overlap joint connection section of the reinforcement material, reduces the consumption of the reinforcement material and saves the cost by reasonably reserving the lengths of different types of longitudinal ribs of the precast column on the basis of ensuring the connection strength and the quality; by using ultra-high performance concrete (UHPC) in the post-cast strip region, shear force and axial force can be effectively transferred, the bearing capacity of the post is improved, the deformability of the post is ensured, and better anti-seismic performance is achieved. In summary, the invention provides a precast concrete column with both durability and stress performance and an assembly method thereof, which are suitable for underground or underwater corrosive environments.
While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that modifications may be made to the described embodiments in various different ways without departing from the spirit and scope of the invention. Accordingly, the drawings and description are to be regarded as illustrative in nature and not as restrictive of the scope of the invention, which is defined by the appended claims.
Claims (10)
1. The mixed reinforcement precast concrete column with the spiral stirrup core column is characterized by comprising an upper precast concrete column (1), a lower precast concrete column (2), post-cast area additional stirrups (3), vertical diagonal bracing steel bars (4) and post-cast UHPC connecting parts (5); wherein:
the upper precast concrete column (1) is a lower convex column body, a first FRP stirrup (11), a first FRP longitudinal bar (12), a first steel bar longitudinal bar (13) and a first spiral stirrup (14) are arranged in the upper precast concrete column, and the first FRP longitudinal bar (12) is positioned at the edge of the column body and bound and fixed by the first FRP stirrup (11); the first steel bar longitudinal bar (13) is positioned at the center of the column body and is bound and fixed by the first spiral stirrup (14) to form a first spiral stirrup core column; the first FRP longitudinal ribs (12) protrude out of the lower surface of the upper precast concrete column (1), the first steel bar longitudinal ribs (13) protrude out of the lower convex surface of the upper precast concrete column (1) and are flush with the lower ends of the first FRP longitudinal ribs (12), and the cross section shape of the lower convex is round;
the lower precast concrete column (2) is a flat-top column, a second FRP stirrup (21), a second FRP longitudinal bar (22), a second steel bar longitudinal bar (23) and a second spiral stirrup (24) are arranged in the lower precast concrete column, and the second FRP longitudinal bar (22) is positioned at the edge of the column and bound and fixed by the second FRP stirrup (21); the second steel bar longitudinal bar (23) is positioned at the center of the column body and is bound and fixed by the second spiral stirrup (24) to form a second spiral stirrup core column; the second FRP longitudinal ribs (22) and the second steel bar longitudinal ribs (23) are protruded out of the upper surface of the lower precast concrete column (2), and the upper ends of the second FRP longitudinal ribs (22) are higher than the second steel bar longitudinal ribs (23);
the upper prefabricated concrete column (1) and the lower prefabricated concrete column (2) are connected and supported through the vertical diagonal bracing steel bars (4) at first, the lower end of the first FRP longitudinal bars (12) is overlapped with the upper end of the second FRP longitudinal bars (22), the lower end of the first FRP longitudinal bars (13) is overlapped with the upper end of the second FRP longitudinal bars (23), then reinforcing and connecting are carried out through the post-pouring zone additional stirrups (3), at this moment, a connecting zone is formed between the upper prefabricated concrete column (1) and the lower prefabricated concrete column (2), and the connecting zone forms a post-pouring UHPC connecting part (5) through pouring UHPC, so that the upper prefabricated concrete column (1) is connected with the lower prefabricated concrete column (2).
2. The mixed reinforcement precast concrete column with the spiral stirrup core column according to claim 1, wherein the upper precast concrete column (1) and the lower precast concrete column (2) are made of common concrete with the strength grade between C35 and C80.
3. The mixed reinforcement precast concrete column with the spiral stirrup core column according to claim 1, wherein the post-cast UHPC connecting part (5) adopts ultra-high performance concrete with the strength grade between C100 and C160.
4. The mixed reinforcement precast concrete column with the spiral stirrup core column according to claim 1, wherein the post-cast area additional stirrup (3) comprises an FRP additional stirrup (31) and a reinforcing steel bar additional stirrup (32), the first FRP longitudinal bars (12) and the second FRP longitudinal bars (22) are vertically staggered and are connected through the FRP additional stirrup (31), and the first reinforcing steel bar longitudinal bars (13) and the second reinforcing steel bar longitudinal bars (23) are vertically staggered and are connected through the reinforcing steel bar additional stirrup (32).
5. The mixed reinforced precast concrete column with the spiral stirrup core column according to claim 4, wherein the FRP additional stirrup (31) and the reinforcing steel bar additional stirrup (32) are closed stirrups or spiral stirrups, are in the form of multi-limb stirrups and are uniformly distributed along the axial direction of the column.
6. The mixed reinforcement precast concrete column with the spiral stirrup core column according to claim 1, wherein the first FRP longitudinal bars (12), the first reinforcing steel bar longitudinal bars (13), the second FRP longitudinal bars (22) and the second reinforcing steel bar longitudinal bars (23) are all arranged into a plurality of circumferentially arrayed and distributed bars.
7. The mixed reinforcement precast concrete column with the spiral stirrup core column according to claim 1, wherein the first FRP stirrup (11) and the second FRP stirrup (21) are closed stirrups or spiral stirrups, are in a multi-limb hooping form and are uniformly distributed along the axial direction of the column.
8. The mixed reinforced precast concrete column with spiral stirrup core column according to claim 1, characterized in that the overlap length of the first FRP longitudinal bars (12) and the second FRP longitudinal bars (22) is 15dm-20dm; the overlap joint length of the first longitudinal reinforcement (13) and the second longitudinal reinforcement (23) is 5dm-8dm.
9. The hybrid reinforced precast concrete column with the spiral stirrup core column according to claim 1, wherein the first FRP longitudinal ribs (12) and the second FRP longitudinal ribs (22) are one of glass fiber reinforced plastic ribs, basalt fiber reinforced plastic ribs and carbon fiber reinforced plastic ribs.
10. Method for assembling a hybrid reinforced precast concrete column with spiral stirrup core according to any one of claims 1 to 9, characterized in that it comprises the following steps:
s1, prefabricating an upper precast concrete column (1), a lower precast concrete column (2) and additional stirrups (3) in a post-pouring area in a factory, and roughening the bottom of the upper precast concrete column (1) and the top of the lower precast concrete column (2);
s2, sequentially penetrating the additional stirrups (3) of the post-cast area from top to bottom through the outer sides of the longitudinal ribs extending out of the lower precast concrete column (2);
s3, vertically hoisting the upper precast concrete column (1), stacking the upper precast concrete column (1) and the lower precast concrete column (2) up and down, aligning and leveling the central lines of the upper precast concrete column (1) and the lower precast concrete column (2), and welding vertical diagonal bracing steel bars (4) on four sides of reserved longitudinal bars of the first spiral stirrup core column for temporarily supporting the column shaft of the upper precast concrete column (1); then binding and fixing longitudinal ribs which are respectively stretched out of the upper precast concrete column (1) and the lower precast concrete column (2) and vertically lapped outside by using the sleeved additional stirrups (3) of the post-pouring area;
s4, cleaning a connecting area, erecting a template in the connecting area, reserving a pouring opening, pouring ultra-high performance concrete, and removing the template after the concrete is hardened, wherein a post-pouring UHPC connecting part (5) is formed between the upper precast concrete column (1) and the lower precast concrete column (2), so that the assembly of the mixed reinforcement precast concrete column with the spiral stirrup core column is completed.
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