CN115370071A - Prefabricated assembly type hoop confined concrete and square steel pipe combined column and construction method - Google Patents
Prefabricated assembly type hoop confined concrete and square steel pipe combined column and construction method Download PDFInfo
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- CN115370071A CN115370071A CN202211087857.2A CN202211087857A CN115370071A CN 115370071 A CN115370071 A CN 115370071A CN 202211087857 A CN202211087857 A CN 202211087857A CN 115370071 A CN115370071 A CN 115370071A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 234
- 239000010959 steel Substances 0.000 title claims abstract description 234
- 238000010276 construction Methods 0.000 title claims abstract description 43
- 239000004567 concrete Substances 0.000 title claims abstract description 39
- 239000011374 ultra-high-performance concrete Substances 0.000 claims abstract description 42
- 238000003466 welding Methods 0.000 claims description 38
- 239000002131 composite material Substances 0.000 claims description 27
- 238000000034 method Methods 0.000 claims description 18
- 230000000149 penetrating effect Effects 0.000 claims description 15
- 230000035515 penetration Effects 0.000 claims description 11
- 239000006260 foam Substances 0.000 claims description 9
- 210000001503 joint Anatomy 0.000 claims description 9
- 230000002787 reinforcement Effects 0.000 claims description 9
- 230000002457 bidirectional effect Effects 0.000 claims description 8
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 238000009417 prefabrication Methods 0.000 claims description 6
- 238000009415 formwork Methods 0.000 claims description 4
- 239000011440 grout Substances 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 239000002002 slurry Substances 0.000 claims description 3
- 239000004574 high-performance concrete Substances 0.000 claims description 2
- 239000011150 reinforced concrete Substances 0.000 abstract description 5
- 239000007787 solid Substances 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 230000000452 restraining effect Effects 0.000 description 3
- 238000005336 cracking Methods 0.000 description 2
- 238000005266 casting Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000003351 stiffener Substances 0.000 description 1
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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
- E04C3/32—Columns; Pillars; Struts of metal
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- 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
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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
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- 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
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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
- E04H9/021—Bearing, supporting or connecting constructions specially adapted for such buildings
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention provides a prefabricated assembled hoop restrained concrete and square steel tube combined column and a construction method, and relates to the technical field of construction and construction. In addition, the combined column has the advantages of high bearing capacity, good anti-seismic performance and durability, convenience in splicing and the like, and has a good engineering application prospect. And moreover, by adopting the ultra-high performance concrete, the problem of reduced bearing capacity caused by hollow cross sections of the square steel pipes can be solved. Compared with a prefabricated solid reinforced concrete column, the self weight of the combined column is greatly reduced, and meanwhile, due to the fact that extra constraint is carried out on a plastic hinge area at the column end, the anti-seismic performance of the combined column is good. And the connection of the combination column is more convenient and faster.
Description
Technical Field
The invention relates to the technical field of construction and construction, in particular to a prefabricated assembled hoop confined concrete and square steel pipe combined column and a construction method.
Background
The assembly type structure is a structure formed by assembling prefabricated components serving as main stress components on site. Because the cast-in-place operation is less, the assembled structure has the advantages of high production efficiency, energy conservation, environmental protection, low manufacturing cost and the like, and is one of the important development directions of the building structure in China. The site operation of the fabricated building structure needs a large amount of hoisting operation, and the dead weight of the solid prefabricated column is usually larger, so that the hoisting equipment is required to be larger, the construction cost is increased, and the construction speed is reduced.
Disclosure of Invention
In view of the above, the present invention provides a prefabricated assembled hoop reinforced concrete and square steel pipe combination column and a construction method thereof, so as to solve the above problems.
The invention adopts the following scheme:
the application provides a construction method of a prefabricated assembled hoop confined concrete and square steel pipe combined column, which comprises the following steps:
s1: welding the square steel pipe and the stiffening ribs along each side wall of the square steel pipe in the height range of the section size of the combined column which is one time of the lower end of the square steel pipe, namely in the range of the column end plastic hinge area, and transversely arranging stirrups which are not configured in the column end plastic hinge area outside the square steel pipe at intervals along the longitudinal direction;
s2: the upper end plate and the lower end plate are provided with bolt holes and welding studs, the upper end plate is welded with the top of the square steel pipe, and the centers of the upper end plate and the lower end plate are positioned on the same plumb line; then, within the range of the height of the section size of the combined column which is one time of the upper end of the square steel pipe, welding the square steel pipe and the stiffening ribs along each side wall of the square steel pipe, penetrating a screw rod into a bolt hole of the upper end plate, and simultaneously screwing a nut arranged on one side of the lower surface of the upper end plate so as to longitudinally fix the screw rod;
s3: in the plastic hinge area of the column end, welding stiffening ribs and steel plate hoops along each side of the column, reserving grouting space at the bottom of the column, and filling foam in gaps between adjacent steel plate hoops; penetrating a longitudinal bar from the outer side of the bottom of the square steel pipe, and binding the stirrups and the longitudinal bar together according to a preset interval to form a steel reinforcement framework between the plastic hinge areas at the two column ends;
s4: welding the lower end plate with the bottom of the square steel pipe, wherein the centers of the lower end plate and the square steel pipe are positioned on the same plumb line;
s5: and (3) butting the longitudinal templates in the region without the steel plate hoops between the upper end plate and the lower end plate, pouring the ultrahigh-performance concrete of the combined column from bottom to top, stopping pouring when the ultrahigh-performance concrete is poured to be level with the bottom surface of the steel plate hoop on the outermost side of the lower end of the column, and maintaining to finish prefabrication of the combined column.
As a further improvement, the method also comprises the following steps:
s6: carrying out construction operation on site through the prefabricated combined column;
s7: installing a longitudinal and transverse bidirectional superposed beam prefabricated part at the node of the combined column, connecting a bottom longitudinal rib of the prefabricated part of the superposed beam with a node area longitudinal rib, and binding a longitudinal rib of a cast-in-place part of the superposed beam, which penetrates through the node, with a stirrup of the prefabricated part;
s8: overlapping templates and pouring concrete at the cast-in-place part of the composite beam, and then overlapping templates and pouring ultrahigh-performance concrete at the node area of the composite column;
s9: pouring a cushion layer of the node area, enabling a screw rod on the combined column to penetrate through the cushion layer and be at least partially exposed outside, aligning the centroids of the upper combined column and the lower combined column, penetrating the screw rod of the lower combined column into a bolt hole of a lower end plate of the upper combined column, and screwing a nut to enable the screw rod to penetrate and be fixed in the lower end plate of the upper combined column;
s10: reserving a grouting position at the column bottom of the upper combined column, respectively welding two steel plates with holes in the middle and two steel plates without holes with stiffening ribs, wherein the two steel plates with holes are oppositely arranged, welding the four steel plates in pairs at the corner positions by adopting full penetration welding seams to form steel plate hoops, and filling foam in gaps between the steel plate hoops and the upper adjacent steel plate hoops; and then pouring the super-high performance concrete without coarse aggregate into the connection position of the upper and lower combined columns connected by the bolts, grouting into the hole on one side during construction, and stopping construction when slurry flows out from the hole on the other side.
As a further improvement, in step S7, the method includes: and butt-jointing the longitudinal ribs of the node area superposed above the upper end plate and the longitudinal ribs at the bottom of the prefabricated part of the superposed beam together in a mechanical connection mode.
As a further improvement, in step S8, the method includes: the side parts of the stirrups extending out of the top surface of the prefabricated part of the superposed beam and the longitudinal steel bars bound with the stirrups and the longitudinal steel bars of the longitudinal and transverse bidirectional through nodes are matched with the prefabricated part to lap the template, and the side part of the post-cast slot above the combined column is lapped with the template; and reserving a post-pouring slot at the joint of the combined column and the superposed beam, wherein the concrete in the post-pouring slot is ultra-high performance concrete.
As a further improvement, in the column end plastic hinge area, a plurality of steel plate hoops are welded in a wrapping mode, and the gap between every two adjacent steel plate hoops is configured to be smaller than the width of each steel plate hoop; after the upper and lower combined columns are connected by bolts, the upper and lower combined columns are sealed by using the mode of manufacturing steel plate hoops on site, namely two steel plates with holes in the middle and two steel plates without holes are respectively welded with stiffening ribs, wherein the two steel plates with holes are oppositely arranged, and four steel plates are welded in pairs at the corner positions by adopting full penetration welding seams to form the steel plate hoops; two holes opened on a pair of edges of the steel plate hoop are respectively a grouting opening and a grout outlet, so that the ultrahigh-performance concrete without coarse aggregate can be poured in the following process.
As a further improvement, in step S2, the method includes: the studs are welded on the inner surfaces of the upper end plate and the lower end plate and extend into the combined column, the studs and the bolt holes are arranged in a avoiding mode, the bolt holes are regularly arranged on the periphery of the end plate, and the studs are regularly welded on the end face of the outer peripheral side of the end plate.
As a further improvement, in step S3, the method includes: the reinforcing steel bar framework is supported and arranged in a non-plastic hinge area in the middle of the combined column, and the width of the reinforcing steel bar framework is smaller than that of the steel plate hoops in a surrounding mode, so that the butt joint of the follow-up template between the two column end plastic hinge areas is facilitated.
The application further provides a prefabricated assembled hoop confined concrete and square steel tube combined column, which is constructed by the construction method, and comprises the following steps: the steel plate hoop comprises an upper end plate, a square steel pipe, a stiffening rib, a steel plate hoop, a stirrup, a longitudinal bar and a lower end plate; the stiffening ribs are welded on the outer side wall of the pipe of the square steel pipe, each side wall of the upper end and the lower end of the square steel pipe is longitudinally welded with the stiffening rib, and the number of the stiffening ribs is determined according to the constraint requirement of concrete; a plurality of steel plate hoops welded and enclosed on the stiffening ribs are arranged in the column end plastic hinge area along the longitudinal direction at intervals so as to realize the pulling connection of the square steel pipe and the steel plate hoops; two ends of the square steel pipe are respectively welded with the upper end plate and the lower end plate, the end plates are not in contact with the stiffening ribs, a plurality of longitudinal ribs are arranged in a space of a non-plastic hinge area formed between the two column end plastic hinge areas at intervals along the vertical direction, and a plurality of stirrups bound with the longitudinal ribs are arranged at intervals along the transverse direction, so that an internal steel reinforcement framework is formed; the bolt nails are welded on the inner surfaces of the upper end plate and the lower end plate, bolt holes are reserved in the upper end plate and the lower end plate and used for penetrating through the screw rods, and at least part of the screw rods extend to the inner surfaces of the end plates; installing a longitudinal template in an area of the combined column without the steel plate hoop, and reserving a grouting position at the bottom of a plastic hinge area at the lower end of the combined column so as to pour the ultrahigh-performance concrete from bottom to top and perform the following operations: and welding two steel plates with holes in the middle and two steel plates without holes with stiffening ribs respectively, wherein the two steel plates with holes are oppositely arranged, welding every two of the four steel plates at the corner position by adopting a full penetration welding seam to form a steel plate hoop, and then pouring the ultrahigh-performance concrete without coarse aggregate into the position where the upper and lower combined columns are connected by using bolts.
As a further improvement, the combined column also comprises a superposed beam arranged on the combined column; the construction of the cast-in-place part of the superposed beam on the combined column is implemented through a steel reinforcement framework of the superposed beam, and after the superposed beam and a node area of the combined column are subjected to formwork erection and pouring, a screw rod is arranged on a cushion layer between the superposed beam and a lower end plate of an upper combined column in a penetrating mode and is used for butt joint matching between the lower combined column and the upper combined column.
By adopting the technical scheme, the invention can obtain the following technical effects:
1. the combined column of the prefabricated hoop confined concrete and the square steel pipe and the construction method can greatly reduce the dead weight of the prefabricated column, further reduce the construction cost of the prefabricated building and improve the construction efficiency. In addition, the combined column has the advantages of high bearing capacity, good anti-seismic performance and durability, convenience in splicing and the like, and has a good engineering application prospect.
2. In the invention, the steel plate hoop and the stiffening rib are discontinuous along the longitudinal direction of the column and are only arranged in the plastic hinge area at the column end, one end of the stiffening rib is welded with the built-in square steel pipe, and the other end of the stiffening rib is welded with the steel plate hoop, so that the steel plate hoop and the steel plate hoop are tied, the constraint on the ultra-high performance concrete (UHPC) outside the pipe is enhanced, and the ductility of the combined column is improved.
3. And when the ultrahigh-performance concrete outside the pouring pipe is filled with foam, the steel plate hoops only play a role of circumferential restraint and do not bear vertical load.
4. Longitudinal bars are arranged in the extra-pipe ultrahigh-performance concrete along the longitudinal direction of the combined column, stirrups are arranged in the non-plastic hinge area, the longitudinal bars of the combined column are constructional steel bars, only play a role in cracking resistance, do not penetrate through joints, do not consider the role of bearing vertical loads, and have the diameter equivalent to that of the stirrups.
5. In order to realize splicing at the node between the combined columns which are configured up and down, the upper end and the lower end of each combined column are respectively welded with an end plate, bolt holes are reserved in the end plates, and meanwhile, studs are welded on the lower surface of the upper end plate and the upper surface of the lower end plate, so that the end plates and surrounding ultrahigh-performance concrete can work in a cooperative mode. Before the external ultrahigh-performance concrete is poured, a screw rod is penetrated through a bolt hole in the upper end of the combined column in advance and is fixed, and the distance of the screw rod extending out of the end plate is larger than the height of the node area, so that the subsequent upper combined column and the lower combined column can be spliced smoothly. Meanwhile, a certain space is reserved at the bottom of the plastic hinge area at the lower end of the combined column, after the upper combined column and the lower combined column are connected through bolts, the two steel plates with holes in the middle and the two steel plates without holes are respectively welded with the stiffening rib, and the two steel plates with holes are oppositely arranged. After the four steel plates are welded with the stiffening ribs, welding the four steel plates in pairs at the corner positions by adopting full penetration welding seams to form the steel plate hoop. The holes formed in the steel plate hoops are used for pouring the ultra-high performance concrete without coarse aggregate to the connection positions of the upper and lower combined column bolt connections.
6. And a rear pouring groove opening is reserved in a node area between the combined column and the superposed beam, the concrete in the rear pouring groove opening is made of ultra-high performance concrete, and the stirrups of the prefabricated part of the superposed beam extend out of the top surface of the prefabricated part of the superposed beam and are bound with the top longitudinal reinforcements of the cast-in-place part. The bottom embedded mechanical connecting joint of the prefabricated part of the longitudinal and transverse bidirectional superposed beam in the node area is used for connecting the bottom longitudinal rib and the node area longitudinal rib to enable the bottom longitudinal rib and the node area longitudinal rib to penetrate through the node. And the top longitudinal bar of the cast-in-place part of the superposed beam also needs to be arranged in a penetrating way so as to meet the requirement of earthquake resistance. Meanwhile, at the node, a cushion layer is arranged between the lower end plate of the upper combination column and the floor slab, and the leveling effect is achieved.
7. The combined column adopts ultra-high performance concrete, and can solve the problem of bearing capacity reduction caused by hollow section of a square steel pipe. Compared with a prefabricated solid reinforced concrete column, the self weight of the combined column is greatly reduced, and meanwhile, due to the fact that extra restraint is carried out on a column end plastic hinge area, the anti-seismic performance of the combined column is good. And the connection of the combined column is more convenient and quicker.
Drawings
Fig. 1 is a flow chart of factory prefabrication of a composite column in a construction method of prefabricating a composite column of prefabricated hoop confined concrete and square steel pipes according to an embodiment of the present invention;
FIG. 2 is a flow chart of the on-site construction of the joint splicing of the combination column in the construction method of the combination column of the prefabricated hoop restraining concrete and the square steel pipe according to the embodiment of the invention;
fig. 3 is a three-dimensional structural view of a prefabricated assembled hoop confined concrete and square steel pipe combined column according to an embodiment of the present invention (before pouring of external ultra-high performance concrete);
FIG. 4 is a constructional view of FIG. 3 in a front view;
fig. 5 is a three-dimensional structural view of a prefabricated assembled hoop confined concrete and square steel pipe composite column according to an embodiment of the present invention (after casting external ultra-high performance concrete);
FIG. 6 is a configuration diagram of FIG. 5 in a front view;
fig. 7 is a construction diagram of the prefabricated assembled hoop restraining concrete and square steel pipe combined column according to the embodiment of the present invention, in which the prefabricated part of the composite beam is installed, the top longitudinal bar of the cast-in-place part of the composite beam is bound, and the bottom longitudinal bar of the prefabricated part of the composite beam is mechanically connected to the node area longitudinal bar;
fig. 8 is a structural diagram of a combination column node after pouring ultra-high performance concrete in the construction method of the combination column of prefabricated hoop restraining concrete and square steel tubes according to the embodiment of the invention;
fig. 9 is a schematic diagram illustrating a spliced combined column node in the construction method of the prefabricated hoop confined concrete and square steel pipe combined column according to the embodiment of the present invention;
fig. 10 is a diagram of reinforcing bars of a composite column of prefabricated hoop reinforced concrete and square steel pipes according to an embodiment of the present invention.
Illustration of the drawings: 1-square steel tube; 2-ultra high performance concrete; 3-a stiffening rib; 4-a steel plate hoop; 5-upper end plate; 6-lower end plate; 7-longitudinal ribs of the composite column; 8-stirrup of combined column; 9-screw rod; 10-a nut; 11-a stud; 12-filled foam; 13-bolt holes; 14-cast-in-place part of the composite beam; 15-prefabricated parts of the superposed beams; 16-a laminated beam; 17-a cushion layer; 18-ultra high performance concrete without coarse aggregate; 19-grouting holes; 20-node area longitudinal bars; 21-top longitudinal bars of the cast-in-place part of the superposed beam; 22-stirrups of the superposed beams; 23-mechanical connection joints; 24-top longitudinal bars of the prefabricated part of the superposed beam; 25-bottom longitudinal ribs of the prefabricated part of the superposed beam.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Examples
Referring to fig. 1 to 10, the present embodiment provides a construction method of a prefabricated assembled hoop confined concrete and square steel pipe combined column, including:
s1: in the range of the height of the section size of the combined column doubled at the lower end of the square steel pipe 1, namely in the range of the column end plastic hinge area, welding the square steel pipe and the stiffening ribs 3 along each side wall of the square steel pipe, and transversely arranging stirrups 8 configured in the non-column end plastic hinge area outside the square steel pipe 1 at intervals along the longitudinal direction;
s2: forming bolt holes 13 and welding studs 11 on the upper end plate 5 and the lower end plate 6, welding the upper end plate 5 with the top of the square steel tube 1, and enabling the centers of the upper end plate and the square steel tube to be located on the same plumb line; then, in the range of the height of the section size of the combined column which is one time of the upper end of the square steel pipe 1, welding the square steel pipe 1 and the stiffening ribs 3 along each side wall of the square steel pipe 1, penetrating a screw 9 in a bolt hole 13 of the upper end plate 5, and simultaneously screwing a nut 10 arranged on one side of the lower surface of the upper end plate 5 so as to longitudinally fix the screw 9;
s3: in the plastic hinge area of the column end, welding stiffening ribs 3 and steel plate hoops 4 along each side of the column, reserving grouting space at the bottom of the column, and filling foam in gaps between the adjacent steel plate hoops 4; penetrating a longitudinal bar 7 from the outer side of the bottom of the square steel pipe 1, and binding a stirrup 8 and the longitudinal bar 7 together according to a preset interval to form a steel bar framework between the plastic hinge areas at the two column ends;
s4: welding a lower end plate 6 with the bottom of the square steel pipe 1, wherein the centers of the lower end plate and the square steel pipe are positioned on the same plumb line;
s5: and (3) butting longitudinal formworks in the region without the steel plate hoop 4 between the upper end plate 5 and the lower end plate 6, pouring the ultrahigh-performance concrete 2 of the combined column from bottom to top, stopping pouring when the pouring is level to the bottom surface of the steel plate hoop 4 at the outermost side of the lower end of the column, and maintaining to finish prefabrication of the combined column.
In the factory prefabrication stage of the combined column, the self weight of the prefabricated column can be greatly reduced by prefabricating the combined column of the prefabricated hoop constraint concrete and the square steel pipe and the construction method, so that the construction cost of the prefabricated building is reduced, and the construction efficiency is improved. In addition, the combined column has the advantages of high bearing capacity, good anti-seismic performance and durability, convenience in splicing and the like, and has a good engineering application prospect.
Still further, in other embodiments, comprising: four steel plates with the same rule are welded with the stiffening ribs 3, and the steel plates are welded together in pairs at the corners by full penetration welding seams to form an integral steel plate hoop 4. Specifically, in the column end plastic hinge region, a plurality of steel plate hoops 4 are welded in a wrapping manner, and the gap between every two adjacent steel plate hoops 4 is configured to be smaller than the width of the steel plate hoops 4; after the upper and lower combined columns are connected by bolts, the connection positions of the upper and lower combined columns connected by the bolts are sealed by adopting a mode of manufacturing steel plate hoops on site, namely two steel plates with holes in the middle and two steel plates without holes are respectively welded with the stiffening ribs 3, wherein the two steel plates with holes are oppositely arranged, and four steel plates are welded in pairs at the corner positions by adopting full penetration welding seams to form steel plate hoops 4; two holes opened on a pair of edges of the steel plate hoop 4 are a grouting hole and a grout outlet (a grouting hole 19 shown in the figure) respectively, so that the ultrahigh-performance concrete 18 without coarse aggregate can be poured in the following process.
Wherein, in step S2, the method includes: the studs 11 are welded on the inner surfaces of the upper end plate 5 and the lower end plate 6 and extend into the combined column, the studs 11 and the bolt holes 13 are arranged in a mutually avoiding mode, the bolt holes 13 are regularly arranged on the periphery of the end plate, and the studs 11 are regularly welded on the end face of the outer peripheral side of the end plate.
Wherein, in step S3, the method includes: the reinforcing steel bar framework is supported and configured in a non-plastic hinge area in the middle of the combined column, and the width dimension of the reinforcing steel bar framework is configured to be smaller than the width dimension enclosed by the steel plate hoops 4, so that the butt joint of the follow-up template between the two column end plastic hinge areas is facilitated.
Therefore, the middle steel plate hoop 4 and the stiffening rib 3 are discontinuous along the longitudinal direction of the column and are only arranged in the plastic hinge area at the column end, one end of the stiffening rib 3 is welded with the built-in square steel pipe 1, and the other end of the stiffening rib is welded with the steel plate hoop 4, so that the steel plate hoop 4 and the square steel pipe 1 are tied, the constraint of Ultra High Performance Concrete (UHPC) outside the pipe is enhanced, and the ductility of the combined column is improved.
And a gap is reserved between the stiffening rib 3 and the adjacent end plate, and a gap is also reserved between the stiffening rib and the steel plate hoop 4 in the column end plastic hinge area, and when the external ultrahigh-performance concrete is poured, the foam is filled, so that the steel plate hoop 4 only plays a role in circumferential restraint, and does not bear vertical load.
In addition, longitudinal bars are arranged in the extra-pipe ultrahigh-performance concrete along the longitudinal direction of the combined column, stirrups are arranged in the non-plastic hinge area, the longitudinal bars of the combined column are constructional steel bars, only play a role in cracking resistance, do not penetrate through joints, do not consider the role of bearing vertical load, and have the diameter equivalent to that of the stirrups.
In addition, in order to realize splicing at a node between the vertically arranged combined columns, end plates are respectively welded at the upper ends and the lower ends of the combined columns, bolt holes 13 are reserved in the end plates, and studs 11 are welded on the lower surfaces of the upper end plates 5 and the upper surfaces of the lower end plates 6, so that the end plates and surrounding ultrahigh-performance concrete can work cooperatively. Before the external ultrahigh-performance concrete is poured, a screw 9 is penetrated through a bolt hole 13 at the upper end of the combined column in advance and is fixed, and the distance of the screw 9 extending out of the end plate is greater than the height of the node area, so that the subsequent upper combined column and the lower combined column can be spliced smoothly. Meanwhile, a certain space is reserved at the bottom of the plastic hinge area at the lower end of the combined column, after the upper combined column and the lower combined column are connected through bolts, the two steel plates with holes in the middle and the two steel plates without holes are respectively welded with the stiffening ribs 3, and the two steel plates with holes are oppositely arranged. After the four steel plates are welded with the stiffening ribs 3, the four steel plates are welded pairwise at the corner positions by full penetration welding seams to form steel plate hoops 4. The holes on the steel plate hoops 4 are used for pouring ultra-high performance concrete (without coarse aggregate 18) to the connection positions of the upper and lower combination column bolt connections.
As shown in fig. 2 to 10, in this embodiment, after the factory prefabrication stage, a site construction stage is further implemented, which specifically includes the following steps:
s6: carrying out construction operation on site through the prefabricated combined column;
s7: installing a longitudinal and transverse bidirectional superposed beam prefabricated part at the node of the combined column, connecting a bottom longitudinal rib of the prefabricated part of the superposed beam with a node area longitudinal rib, and binding a longitudinal rib of a cast-in-place part 14 of the superposed beam, which penetrates through the node, with a stirrup of a prefabricated part 15;
s8: overlapping templates and pouring concrete in the cast-in-place part 14 of the composite beam, and then overlapping templates and pouring ultrahigh-performance concrete in the node area of the composite column;
s9: pouring a cushion layer of the node area, enabling the screw rod 9 on the combined column to penetrate through the cushion layer 17 and be at least partially exposed outside, aligning the centroids of the upper combined column and the lower combined column, enabling the screw rod 9 of the lower combined column to penetrate into the bolt hole 13 of the lower end plate 6 of the upper combined column, and screwing the nut 10 to enable the screw rod 9 to penetrate and be fixed in the lower end plate 6 of the upper combined column;
s10: reserving a grouting position at the column bottom of the upper combined column, respectively welding two steel plates with holes in the middle and two steel plates without holes with stiffening ribs 3, wherein the two steel plates with holes are oppositely arranged, welding the four steel plates in pairs at the corner positions by adopting full penetration welding seams to form steel plate hoops 4, and filling foam in gaps between the steel plate hoops and the upper adjacent steel plate hoops 4; and then pouring coarse aggregate-free ultrahigh-performance concrete 18 into the connection position of the upper combined column and the lower combined column which are connected by the bolts, grouting into the hole on one side during construction, and stopping construction when slurry flows out from the hole on the other side.
Wherein, in step S7, the method includes: and butting the node area longitudinal rib 20 superposed above the upper end plate 5 and the bottom longitudinal rib 25 of the prefabricated part of the superposed beam together by adopting a mechanical connection mode. Specifically, the specific manufacturing method of the precast part of the superposed beam is as follows: and binding the top longitudinal bar 24 and the bottom longitudinal bar 25 of the prefabricated part of the superposed beam together with the stirrups 22 to form a reinforced skeleton, overlapping templates at the bottom, the side and the middle of the reinforced skeleton, and pouring concrete until the concrete does not pass through the limiting template positioned in the middle to form the prefabricated part 15 of the superposed beam.
Wherein, in step S8, the method includes: the side parts of the stirrups extending out of the top surface of the prefabricated part 15 of the superposed beam and the longitudinal steel bars 20 bound with the stirrups and the longitudinal and transverse bidirectional through nodes are matched with the prefabricated part to lap the template, and the side part of the post-cast groove above the combined column is lapped with the template; and reserving a post-pouring slot at the joint of the combined column and the superposed beam, wherein the concrete in the post-pouring slot is ultra-high performance concrete.
In the above, the matching operation of the prefabricated combination column and the superposed beam 16 in the construction stage is further realized. Wherein, a post-pouring groove opening is reserved in a node area between the combination column and the superposed beam 16, the concrete in the post-pouring groove opening is made of ultra-high performance concrete, and the stirrup 22 of the prefabricated part of the superposed beam extends out of the top surface of the superposed beam and is bound with the top longitudinal bar 21 of the cast-in-place part. The bottom embedded mechanical connecting joint 23 of the prefabricated part of the longitudinal and transverse bidirectional superposed beam in the node area is used for connecting the bottom longitudinal bar 25 with the node area longitudinal bar 20 so as to penetrate through the node. And, the top longitudinal bar 21 of the cast-in-place part of the composite beam also needs to be arranged in a penetrating way so as to meet the requirement of earthquake resistance. Meanwhile, at the node, a cushion layer 17 is arranged between the lower end plate 6 of the upper combination column and the floor slab, and the leveling effect is achieved.
In addition, the combined column adopts ultra-high performance concrete, and can make up for the problem of bearing capacity reduction caused by the hollow section of the square steel pipe. Compared with a prefabricated solid reinforced concrete column, the combined column has the advantages that the self weight is greatly reduced, and meanwhile, due to the fact that extra restraint is carried out on a plastic hinge area at the column end, the combined column is good in anti-seismic performance, and the combined column is convenient and rapid to connect.
With reference to fig. 3 to 10, the present embodiment further provides a prefabricated assembled hoop-confined concrete and square steel pipe combined column, which is constructed by the above construction method, and includes: the steel plate comprises an upper end plate 5, a square steel pipe 1, a stiffening rib 3, a steel plate hoop 4, a stirrup 8, a longitudinal rib 7 and a lower end plate 6; wherein, the welding of stiffening rib 3 is on the outside of tubes lateral wall of square steel pipe 1, and the upper end and the lower extreme of square steel pipe 1 all have stiffening rib 3 along vertical welding, and the quantity of stiffening rib 3 is confirmed according to the restraint demand of concrete. Wherein, a column end plastic hinge area with the section size and height range doubled is formed at the two ends of the square steel tube 1, and a plurality of steel plate hoops 4 welded and enclosed on the stiffening ribs 3 are arranged in the plastic hinge area along the longitudinal direction at intervals.
A plurality of steel plate hoops 4 welded and enclosed on the stiffening ribs 3 are arranged in the column end plastic hinge area along the longitudinal direction at intervals so as to realize the drawknot of the square steel pipe 1 and the steel plate hoops 4; the two ends of the square steel pipe 1 are respectively welded with an upper end plate 5 and a lower end plate 6, the end plates are not in contact with the stiffening ribs 3, a plurality of longitudinal ribs 7 are vertically arranged at intervals in a space of a non-plastic hinge area formed between the two column end plastic hinge areas, and a plurality of stirrups 8 bound with the longitudinal ribs are transversely arranged at intervals to form an internal steel reinforcement framework; the inner surfaces of the upper end plate and the lower end plate are welded with studs 11, bolt holes 13 are reserved in the upper end plate and the lower end plate and used for penetrating through the screw 9, and at least part of the screw 9 extends to the inner surface of the end plate; installing a longitudinal template in an area of the combined column, which is not provided with the steel plate hoop 4, and reserving a grouting position at the bottom of a plastic hinge area at the lower end of the combined column so as to pour the ultrahigh-performance concrete from bottom to top and perform the following operations: two steel plates with holes in the middle and two steel plates without holes are respectively welded with the stiffening ribs 3, wherein the two steel plates with holes are oppositely arranged, the four steel plates are welded in pairs at the corner positions by adopting full penetration welding seams to form steel plate hoops 4, and then the parts of the upper and lower combination columns which are connected by bolts are poured with the ultrahigh-performance concrete 18 without coarse aggregate.
In the present embodiment, the present invention further includes a composite beam 16 disposed on the composite column; the construction of the cast-in-place part 14 on the combined column is implemented by the superposed beam through a steel reinforcement framework of the superposed beam, and after the superposed beam 16 and a node area of the combined column are subjected to formwork erection and pouring, a screw 9 is arranged on a cushion layer 17 between the superposed beam and the lower end plate 6 of the upper combined column in a penetrating way and is used for butt joint matching between the lower combined column and the upper combined column.
Wherein, the prefabricated section size of the combined column is determined by the axle pressure ratio limit value, and the function of the square steel tube 1 is considered when the axle pressure ratio is calculated. Obviously, the cross-sectional dimension of the square steel tube 1 can be determined according to the bearing capacity requirement, meanwhile, the thickness of the square steel tube needs to meet the requirement of the width-thickness ratio limit, the width of the stiffening rib 3 is the clear distance between the built-in square steel tube and the steel plate hoop 4, and the thickness of the stiffening rib is equivalent to that of the square steel tube. The number of the stiffening ribs 3 welded on each side of the square steel tube 1 can be determined according to the constraint requirement of concrete. The length of the stiffening ribs 3 in the longitudinal direction of the composite column, i.e. the extent of the plastic hinge region at the column end, may be taken to be approximately 1 times the cross-sectional dimension of the composite column.
Preferably, the gap between the stiffener 3 and the upper and lower end plates 5, 6 may be taken to be 20mm. The steel plate hoop 4 has the same sectional size as the composite column, has the same thickness as the square steel pipe, and has a height of 1/10 to 1/5 of the sectional size. The spacing between the steel hoops 4 may be 1/5 of the longitudinal width of the steel hoops 4 along the composite column, and the distribution height of the steel hoops along the longitudinal direction of the composite column may also be 1 times the section size of the composite column. And taking the height of the steel plate hoop 4 which is one time and the gap distance between the steel plate hoops 4 which is one time as the space reserved at the bottom of the plastic hinge area at the lower end of the combined column.
In this height range, the steel plate hoop 4 is not welded at first when the composite column is prefabricated, and the diameter of the longitudinal rib 7 may be 8 to 12mm. The stirrups 8 adopt a double-limb hoop, the diameter of which is 8-10 mm, and the distance between adjacent stirrups can be 100-200 mm. The length and width of the two end plates are the same as the cross-sectional dimension of the combined column, and the thickness of the two end plates can be 20mm. The combination column is connected by high-strength bolts when being spliced, the diameter of the screw 9 can be about 1/20 of the section size of the column, and the aperture of the bolt hole 13 and the aperture of the nut 10 are matched with the diameter of the screw 9. The screw 9 should pass through the nodal region, and on the side where the nut 10 is present, the length of the screw 9 extending out of the surface of the end plate may be 50mm, so that the length of the screw 9 is the height of the nodal region plus 2 times the thickness of the end plate and 2 times the height of the nut plus 100mm. The studs 11 welded to the end plates may have a diameter of 13 to 19mm, a length of 80mm, and a spacing of 1/5 of the length of the end plate and arranged around the end plate.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention.
Claims (9)
1. A construction method for a prefabricated assembled hoop confined concrete and square steel tube combined column is characterized by comprising the following steps:
s1: welding the square steel pipe and the stiffening ribs along each side wall of the square steel pipe in the range of one time of the sectional dimension and height of the combined column at the lower end of the square steel pipe, namely in the range of the plastic hinge area at the column end, and transversely arranging stirrups configured in the non-plastic hinge area outside the square steel pipe at intervals along the longitudinal direction;
s2: the upper end plate and the lower end plate are provided with bolt holes and welding studs, the upper end plate is welded with the top of the square steel pipe, and the centers of the upper end plate and the lower end plate are positioned on the same plumb line; then, within the range of the height of the section size of the combined column which is one time of the upper end of the square steel pipe, welding the square steel pipe and the stiffening ribs along each side wall of the square steel pipe, penetrating a screw rod into a bolt hole of the upper end plate, and simultaneously screwing a nut arranged on one side of the lower surface of the upper end plate so as to longitudinally fix the screw rod;
s3: in the plastic hinge area of the column end, welding stiffening ribs and steel plate hoops along each side of the column, reserving grouting space at the bottom of the column, and filling foam in gaps between adjacent steel plate hoops; penetrating a longitudinal bar from the outer side of the bottom of the square steel pipe, and binding the stirrups and the longitudinal bar together according to a preset interval to form a steel reinforcement framework between the plastic hinge areas at the two column ends;
s4: welding the lower end plate with the bottom of the square steel pipe, wherein the centers of the lower end plate and the square steel pipe are positioned on the same plumb line;
s5: and (3) butting the longitudinal templates in the region without the steel plate hoops between the upper end plate and the lower end plate, pouring the ultrahigh-performance concrete of the combined column from bottom to top, stopping pouring when the ultrahigh-performance concrete is poured to be level with the bottom surface of the steel plate hoop on the outermost side of the lower end of the column, and maintaining to finish prefabrication of the combined column.
2. The method for constructing a prefabricated assembled hoop confined concrete and square steel pipe combined column according to claim 1, further comprising the steps of:
s6: carrying out construction operation on site through the prefabricated combined column;
s7: installing a longitudinal and transverse bidirectional superposed beam prefabricated part at the node of the combined column, connecting a bottom longitudinal rib of the prefabricated part of the superposed beam with a node area longitudinal rib, and binding a longitudinal rib of a cast-in-place part of the superposed beam, which penetrates through the node, with a stirrup of the prefabricated part;
s8: overlapping templates and pouring concrete at the cast-in-place part of the composite beam, and then overlapping templates and pouring ultrahigh-performance concrete at the node area of the composite column;
s9: pouring a cushion layer of the node area, enabling a screw rod on the combined column to penetrate through the cushion layer and be at least partially exposed outside, aligning centroids of the upper combined column and the lower combined column, penetrating the screw rod of the lower combined column into a bolt hole of a lower end plate of the upper combined column, and screwing a nut to enable the screw rod to penetrate and be fixed in the lower end plate of the upper combined column;
s10: reserving a grouting position at the column bottom of the upper combined column, respectively welding two steel plates with holes in the middle and two steel plates without holes with stiffening ribs, wherein the two steel plates with holes are oppositely arranged, welding the four steel plates in pairs at the corner positions by adopting full penetration welding seams to form steel plate hoops, and filling foam in gaps between the steel plate hoops and the upper adjacent steel plate hoops; and then pouring the super-high performance concrete without coarse aggregate into the connection position of the upper and lower combined columns connected by the bolts, grouting into the hole on one side during construction, and stopping construction when slurry flows out from the hole on the other side.
3. The method for constructing a prefabricated assembled hoop restrained concrete and square steel pipe combined column according to claim 2, wherein the step S7 comprises:
and butt-jointing the longitudinal ribs of the node area superposed above the upper end plate and the longitudinal ribs at the bottom of the prefabricated part of the superposed beam together in a mechanical connection mode.
4. The method for constructing a prefabricated assembled hoop restrained concrete and square steel pipe combined column according to claim 3, wherein the step S8 comprises:
the side parts of the stirrups extending out of the top surface of the prefabricated part of the superposed beam and the longitudinal steel bars bound with the stirrups and the longitudinal steel bars of the longitudinal and transverse bidirectional through nodes are matched with the prefabricated part to lap the template, and the side part of the post-cast groove above the combined column is lapped with the template; and reserving a post-pouring groove opening at the joint of the combination column and the superposed beam, wherein the concrete in the post-pouring groove opening is ultra-high performance concrete.
5. The method of constructing a prefabricated assembled hoop confined concrete and square steel pipe combination column according to claim 4,
in the column end plastic hinge area, a plurality of steel plate hoops are welded in a wrapping mode, and a gap between every two adjacent steel plate hoops is configured to be smaller than the width of each steel plate hoop; after the upper and lower combined columns are connected by bolts, the upper and lower combined columns are sealed by using the mode of manufacturing steel plate hoops on site, namely two steel plates with holes in the middle and two steel plates without holes are respectively welded with stiffening ribs, wherein the two steel plates with holes are oppositely arranged, and four steel plates are welded in pairs at the corner positions by adopting full penetration welding seams to form the steel plate hoops; two holes opened on a pair of edges of the steel plate hoop are respectively a grouting opening and a grout outlet, so that the ultrahigh-performance concrete without coarse aggregate can be poured in the following process.
6. The method for constructing a prefabricated assembled hoop restrained concrete and square steel pipe combined column according to claim 1, wherein the step S2 comprises:
the studs are welded on the inner surfaces of the upper end plate and the lower end plate and extend into the combined column, the studs and the bolt holes are arranged in a avoiding mode, the bolt holes are regularly arranged on the periphery of the end plate, and the studs are regularly welded on the end face of the outer peripheral side of the end plate.
7. The method for constructing a prefabricated assembled hoop restrained concrete and square steel pipe combined column according to claim 1, wherein the step S3 comprises:
the reinforcing steel bar framework is supported and arranged in a non-plastic hinge area in the middle of the combined column, and the width of the reinforcing steel bar framework is smaller than that of the steel plate hoops in a surrounding mode, so that the butt joint of the follow-up template between the two column end plastic hinge areas is facilitated.
8. A prefabricated assembled hoop confined concrete and square steel pipe composite column constructed by the construction method as claimed in any one of claims 1 to 7, comprising: the steel plate hoop comprises an upper end plate, a square steel pipe, a stiffening rib, a steel plate hoop, a stirrup, a longitudinal bar and a lower end plate; wherein,
the stiffening ribs are welded on the outer side walls of the tubes of the square steel tubes, and the stiffening ribs are welded on each of the side walls of the upper end and the lower end of each square steel tube along the longitudinal direction; a plurality of steel plate hoops welded and enclosed on the stiffening ribs are arranged in the column end plastic hinge area along the longitudinal direction at intervals; two ends of the square steel pipe are respectively welded with the upper end plate and the lower end plate, the end plates are not in contact with the stiffening ribs, a plurality of longitudinal ribs are longitudinally distributed at intervals in a space of a non-plastic hinge area formed between the two column end plastic hinge areas, and a plurality of stirrups bound with the longitudinal ribs are transversely distributed at intervals to form an internal steel reinforcement framework;
the bolt pins are welded on the inner surfaces of the upper end plate and the lower end plate, bolt holes are reserved in the upper end plate and the lower end plate and used for penetrating through the screw rods, and at least part of the screw rods extend to the inner surfaces of the end plates;
and (3) installing a longitudinal template in the area of the combined column without the steel plate hoop, and reserving a grouting position at the bottom of the plastic hinge area at the lower end of the combined column so as to pour the ultra-high performance concrete from bottom to top.
9. The prefabricated assembled hoop confined concrete and square steel pipe combination column as claimed in claim 8, further comprising a composite beam disposed on the combination column; the construction of a cast-in-place part on the combined column is implemented by the superposed beam through a steel reinforcement framework of the superposed beam, and after the superposed beam and a node area of the combined column are subjected to formwork erection and pouring, a screw rod penetrates through a cushion layer between the superposed beam and a lower end plate of an upper combined column and is used for butt joint matching between the lower combined column and the upper combined column.
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