CN115370070A - Prefabricated assembled concrete and square steel pipe combined column and construction method thereof - Google Patents
Prefabricated assembled concrete and square steel pipe combined column and construction method thereof Download PDFInfo
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- CN115370070A CN115370070A CN202211087840.7A CN202211087840A CN115370070A CN 115370070 A CN115370070 A CN 115370070A CN 202211087840 A CN202211087840 A CN 202211087840A CN 115370070 A CN115370070 A CN 115370070A
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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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Abstract
The invention provides a prefabricated assembled concrete and square steel pipe combined column and a construction method thereof, 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 bearing capacity reduction caused by hollow section of the square steel pipe 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 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.
Description
Technical Field
The invention relates to the technical field of construction and building, in particular to a prefabricated assembled concrete and square steel pipe combined column and a construction method thereof.
Background
The assembly type structure is a structure which is 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. A large amount of hoisting operation is needed in the site construction of the fabricated building structure, the dead weight of the solid prefabricated column is usually large, large requirements are provided for hoisting equipment, 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 concrete and square steel tube combination column and a construction method thereof to solve the above problems.
The invention adopts the following scheme:
the application provides a construction method of a prefabricated assembled concrete and square steel pipe combined column, which comprises the following steps:
s1: bending the steel bar section for multiple times to finish the prefabrication of the tie bar;
s2: performing hole opening operation on the stiffening rib according to the preset hole penetrating position and the hole diameter size;
s3: welding the square steel pipe and the stiffening ribs along each side of the column within the range of one time of the height of the column section size at the upper end and the lower end of the square steel pipe;
s4: 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; a screw rod penetrates through the bolt hole of the upper end plate, and a nut arranged on one side of the lower surface of the upper end plate is screwed tightly so as to longitudinally fix the screw rod;
s5: penetrating longitudinal bars into the outer side of the square steel pipe along the bottom of the column, sleeving stirrups, and binding the stirrups and the longitudinal bars together according to a preset interval to form a steel reinforcement framework;
s6: penetrating the tie bar into the opening of the stiffening rib and binding the tie bar with the stirrup, and welding the lower end plate and 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;
s7: and (3) supporting a template between the upper end plate and the lower end plate along the longitudinal direction of the column, reserving a grouting space at the bottom of the column, and pouring and maintaining the ultrahigh-performance concrete of the combined column from bottom to top to finish the prefabrication of the combined column.
As a further improvement, the method also comprises the following steps:
s8: carrying out construction operation on site through the prefabricated combined column;
s9: bending a 90-degree hook on a straight section of the tie bar, which passes through the hole on the stiffening rib, by using a round steel pipe with the diameter equivalent to that of the tie bar; 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 longitudinal rib of a node area, 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;
s10: 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;
s11: pouring a cushion layer of the node area, enabling a screw 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 a screw of the lower combined column into a bolt hole of a lower end plate of the upper combined column, and screwing a nut arranged above the lower end plate of the upper combined column to fix the screw;
s12: and (3) reserving a formwork around a grouting position at the column bottom of the upper combination column, performing operation of pouring coarse aggregate-free ultrahigh-performance concrete at the connection position connected by the bolts, wherein grouting ports and grout outlets are respectively formed in two opposite sides of the formwork, grouting is performed from one side during construction, and construction is stopped when grout flows out from the other side.
As a further improvement, in step S9, the method includes: and butting the longitudinal ribs of the node area superposed above the upper end plate and the bottom longitudinal ribs of the prefabricated part of the superposed beam together in a mechanical connection mode.
As a further improvement, in step S10, 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 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.
As a further improvement, in step S1, the method includes: the concrete steps of bending the linear reinforcing steel bar section into the tie bar are as follows: the two ends of the steel bar section are respectively bent by 90 degrees in the axial plane of the steel bar section, and then two 90-degree hooks are respectively bent at the trisection point of the middle straight line steel bar section along the outside direction of the plane, and the directions of the two hooks are consistent.
As a further improvement, in step S6, the method includes: and the upper end and the lower end of the tie bar penetrate into the opening of the stiffening rib, the tie bar and two adjacent stirrups are bound together, and the two corners of the middle section of the tie bar are clamped on the corresponding stirrups.
As a further improvement, in step S4 and step S6, the method includes: when the upper end plate or the lower end plate is welded, a gap is reserved between the stiffening rib and the adjacent end plate, so that the stiffening rib does not bear vertical load.
As a further improvement, in step S4, 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.
The application also provides a hollow combined column of prefabricated assembled concrete and square steel pipes, which is obtained by the construction method; the composite column comprises: the upper end plate, the square steel pipe, the tie bar, the stirrup, the longitudinal bar and the lower end plate; the stiffening ribs are welded on the outer side walls of the tubes of the square steel tubes, the stiffening ribs are longitudinally welded on each of the side walls of the upper end and the lower end of each square steel tube, and the number of the stiffening ribs is determined according to the constraint requirement of concrete; end plates are welded at two ends of the square steel pipe, the end plates are not in contact with the stiffening ribs, a plurality of longitudinal ribs are distributed at intervals along the longitudinal direction in a space formed by the two opposite end plates, and a plurality of stirrups bound with the longitudinal ribs are distributed at intervals along the transverse direction to form an internal steel bar framework; the stiffening ribs are provided with openings, the upper ends and the lower ends of the tie bars which are bent for multiple times are inserted into the openings of the stiffening ribs in the prefabrication stage of the combined column, and are bound with two adjacent stirrups which are regularly arranged in the plastic hinge area at the column end, so that the hoops and the stiffening ribs are tied; during field construction, a circular steel tube with the diameter equivalent to that of the tie bar is bent to form a 90-degree hook on a straight section of the tie bar penetrating through the hole on the stiffening rib, so that the stiffening rib is prevented from being separated from the tie bar; 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; a longitudinal template is butted between an upper end plate and a lower end plate of the combined column, and a grouting space is reserved between the lower end plate and the supported template, so that the pouring of the ultrahigh-performance concrete is performed from bottom to top, and the operations of supporting the template and pouring the ultrahigh-performance concrete without coarse aggregate are performed on the connecting positions of the upper combined column and the lower combined column which are connected by bolts.
As a further improvement, the combined column further 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 prefabricated concrete and square steel pipe combined column and the construction method thereof can greatly reduce the dead weight of the prefabricated column, further reduce the construction cost of a 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. The stiffening ribs are welded with the square steel pipes outside the pipes, are discontinuous along the longitudinal direction of the combined column, are only arranged in a plastic hinge area at the column end, are provided with holes for connecting and penetrating the tie bars, are not contacted with the end plates, and leave gaps between the stiffening ribs and the end plates, so that the stiffening ribs do not bear vertical loads. Particularly, the tie bars are arranged in the holes in a penetrating mode, the tie bars and the stirrups are bound together, the tie bars are clamped on the corresponding stirrups at two corners of the middle section, and the tie bars and the stiffening ribs are tied through the structure and the configuration, so that the tie bars and the stiffening ribs are restrained, and the ductility of the combined column is improved.
3. 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 is penetrated through a bolt hole at the upper end of the column in advance and is fixed, and the distance of the screw extending out of the end plate is greater than the height of the node area, so that the subsequent smooth splicing between the upper combination column and the lower combination column is facilitated. Meanwhile, a certain space is reserved at the bottom of the plastic hinge area at the lower end of the combined column, and after the upper combined column and the lower combined column are connected through bolts, formwork supporting and pouring of the ultra-high performance concrete without the coarse aggregate are carried out to the connecting position of the bolt connection.
4. 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.
5. 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 combined column has the advantages that the dead weight is greatly reduced, 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 combined column is convenient and rapid to connect.
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 concrete and square steel pipes according to an embodiment of the present invention;
FIG. 2 is a flow chart of on-site construction of joint splicing of a composite column in the construction method of the prefabricated concrete and square steel tube composite column according to the embodiment of the present invention;
fig. 3 is a three-dimensional structural view of the prefabricated concrete and square steel pipe combined column according to the embodiment of the present invention (before the ultra-high performance concrete is poured outside the pipe);
FIG. 4 is a configuration diagram of FIG. 3 from a front perspective;
FIG. 5 is a three-dimensional structural view of a prefabricated concrete and square steel tube composite column according to an embodiment of the present invention (after casting of extra-high performance concrete outside the tube);
FIG. 6 is a configuration diagram of FIG. 5 from a front perspective;
FIG. 7 is a schematic view of a tie bar of a prefabricated concrete and square steel pipe combined column according to an embodiment of the present invention after being bent again in site;
FIG. 8 is a detailed view of the plastic hinge area structure of the column end of the prefabricated concrete and square steel tube combined column according to the embodiment of the present invention;
fig. 9 is a construction diagram of the prefabricated assembled concrete and square steel pipe combined column according to the construction method 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 longitudinal bar of the node area;
fig. 10 is a structural diagram of a combined column node after ultra-high performance concrete is poured in the construction method of the prefabricated concrete and square steel pipe combined column according to the embodiment of the present invention;
fig. 11 is a schematic view of a combined column node after splicing in the construction method of the prefabricated concrete and square steel tube combined column according to the embodiment of the present invention;
fig. 12 is a reinforcing diagram of a composite girder according to the method for constructing a prefabricated concrete and square steel pipe composite column according to the embodiment of the present invention.
Illustration of the drawings: 1-square steel tube; 2-ultra high performance concrete; 3-a stiffening rib; 4-stretching the rib; 5-upper end plate; 6-lower end plate; 7-longitudinal bars of the composite column; 8-stirrup of combined column; 9-screw rod; 10-a nut; 11-a stud; 12-bolt holes; 13-cast-in-place part of the composite beam; 14-prefabricated parts of superposed beams; 15-a laminated beam; 16-a cushion layer; 17-super high performance concrete without coarse aggregate; 18-longitudinal ribs of the nodal region; 19-top longitudinal bars of the cast-in-place part of the superposed beam; 20-stirrups of the superposed beams; 21-mechanical connection joint; 22-top longitudinal bars of the prefabricated part of the superposed beam; 23-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 12, the present embodiment provides a construction method of a prefabricated concrete and square steel tube combined column, including the following steps:
s1: bending the steel bar section for multiple times to complete the prefabrication of the tie bar 4;
s2: performing a hole forming operation on the stiffening rib 3 according to a preset hole forming position and the size of the hole diameter;
s3: welding a square steel pipe 2 and a stiffening rib 3 along each side of the column within the range of the height of the column section size which is one time of the upper end and the lower end of the square steel pipe 1;
s4: the upper end plate 5 and the lower end plate 6 are provided with bolt holes 12 and welding studs 11, the upper end plate 5 is welded with the top of the square steel pipe 1, and the centers of the upper end plate and the square steel pipe are positioned on the same plumb line; a screw 9 is arranged in a bolt hole 12 of the upper end plate 5 in a penetrating way, and a nut 10 arranged on one side of the lower surface of the upper end plate 5 is screwed tightly so as to fix the screw 9 longitudinally;
s5: penetrating a longitudinal bar 7 from the bottom of the column outside the square steel tube 1, sleeving a stirrup 8, and binding the stirrup 8 and the longitudinal bar 7 together according to a preset interval to form a steel bar framework;
s6: penetrating the tie bar 4 into the opening of the stiffening rib 3 and binding the tie bar 8, welding the lower end plate 6 with the bottom of the square steel tube 1, and positioning the centers of the two on the same plumb line;
s7: and (3) supporting a template between the upper end plate 5 and the lower end plate 6 along the longitudinal direction of the column, reserving a grouting space at the bottom of the column, pouring the ultrahigh-performance concrete 2 of the combined column from bottom to top, and maintaining to finish the 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 through prefabricating the combined column of the prefabricated concrete and the square steel pipe and the construction method thereof, 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.
Further, in step S1, the method includes: the concrete steps of bending the straight reinforcing steel bar section into the tie bar 4 are as follows: and two ends of the steel bar section are respectively bent by 90 degrees in an axis plane of the steel bar section, and then two 90-degree hooks are respectively bent at trisection points of the middle linear steel bar section along the outside direction of the plane, and the directions of the two hooks are consistent.
Wherein, in step S6, the method comprises: the upper end and the lower end of the tie bar 4 penetrate into the opening of the stiffening rib 3, the tie bar 4 and the two adjacent stirrups 8 are bound together, and the two corners of the tie bar 4 at the middle section are clamped on the corresponding stirrups 8.
Wherein, in step S4 and step S6, the method includes: when welding the upper end plate 5 or the lower end plate 6, a gap is left between the stiffening rib 3 and the adjacent end plate, so that the stiffening rib 3 does not bear a vertical load.
Wherein, in step S4, the method includes: the stud 11 welds in the internal surface of upper end plate and lower end plate and extends to inside the combination post, and the setting is dodged mutually to stud 11 and bolt hole 12, and a plurality of bolt holes 12 are regularly seted up around the end plate, and a plurality of studs 11 are regularly welded on the terminal surface of the periphery side of end plate.
Therefore, the stiffening ribs 3 are welded with the square steel pipe 1 outside the pipe, are discontinuous along the longitudinal direction of the combined column and are only arranged in the plastic hinge area of the column end, the stiffening ribs 3 are provided with openings for connecting the tie bars 4, the stiffening ribs 3 are not contacted with the end plate, and a gap is left between the stiffening ribs 3 and the end plate, so that the stiffening ribs do not bear vertical load. Particularly, the tie bar 4 is arranged in the hole in a penetrating manner, the tie bar 4 and the stirrups 8 are bound together, and the tie bar 4 is clamped on the corresponding stirrups 8 at two corners of the middle section, so that the tie bar 4 and the stiffening ribs 3 are tied through the structure and the configuration, the constraint on the ultra-high performance concrete (UHPC) outside the pipe is enhanced, and the ductility of the combined column is improved.
In addition, 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, the studs 11 are welded on the lower surface of the upper end plate 5 and the upper surface of the lower end plate 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 penetrates through a bolt hole 12 at the upper end of the column in advance and is fixed, and the distance of the screw 9 extending out of the end plate is larger than the height of the node area, so that the subsequent upper combination column and the lower combination column can be smoothly spliced. Meanwhile, a certain space is reserved at the bottom of the plastic hinge area at the lower end of the combined column, and after the upper combined column and the lower combined column are connected through bolts, formwork supporting and pouring of the ultrahigh-performance concrete 17 without coarse aggregate are carried out until the ultrahigh-performance concrete reaches the connection position of the bolt connection.
As shown in fig. 2 to 12, in this embodiment, after the factory prefabrication stage, a site construction stage is further implemented, which specifically includes the following steps:
s8: carrying out construction operation on site through the prefabricated combined column;
s9: a round steel pipe with the diameter equivalent to that of the tie bar 4 is bent to form a 90-degree hook on a straight section of the tie bar 4 penetrating through the hole on the stiffening rib 3; installing a longitudinal and transverse bidirectional superposed beam prefabricated part 14 at the node of the combined column, connecting a bottom longitudinal rib of the prefabricated part 14 of the superposed beam with a longitudinal rib 18 of a node area, and binding a longitudinal rib 18 of a cast-in-place part 13 of the superposed beam, which penetrates through the node area, with a stirrup of the prefabricated part;
s10: overlapping templates and pouring concrete in the cast-in-place part 13 of the composite beam, and then overlapping templates and pouring ultrahigh-performance concrete in the node area of the composite column;
s11: pouring a cushion layer 16 of the node area, enabling the screw 9 on the combined column to penetrate through the cushion layer 16 and be at least partially exposed outside, aligning the centroids of the upper combined column and the lower combined column, enabling the screw 9 of the lower combined column to penetrate into the bolt hole 12 of the lower end plate of the upper combined column, and screwing the nut 10 arranged above the lower end plate of the upper combined column to fix the screw 9;
s12: and (3) reserving a formwork around a grouting position at the bottom of the upper combination column, pouring coarse aggregate-free ultrahigh-performance concrete 17 into a connection position connected by a bolt 9, respectively forming a grouting opening and a grout outlet on two opposite sides of the formwork, grouting from one side during construction, and stopping construction when grout flows out from the other side.
Wherein, in step S9, the method includes: and the longitudinal ribs 18 of the node area superposed above the upper end plate are butted with the bottom longitudinal ribs 23 of the prefabricated part of the superposed beam in 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 22 and the bottom longitudinal bar 23 of the prefabricated part of the composite beam and the stirrup 20 of the composite beam together to form a reinforcement framework, overlapping templates at the bottom, the side and the middle of the reinforcement framework, and pouring concrete until the concrete does not pass through the limiting template positioned in the middle to form the prefabricated part 14 of the composite beam.
Wherein, in step S10, the method includes: the side parts of the stirrups extending out of the top surface of the prefabricated part 14 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 combined column and the superposed beam 15, wherein the concrete in the post-pouring groove opening is ultra-high performance concrete.
In the above, the matching operation of the prefabricated combination column and the superposed beam 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, the concrete in the post-pouring groove opening is made of ultra-high performance concrete, and the stirrup 20 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 19 of the cast-in-place part. The bottom embedded mechanical connecting joint 21 of the prefabricated part 14 of the longitudinal and transverse bidirectional superposed beam of the node area is used for connecting the bottom longitudinal rib 23 and the node area longitudinal rib 18 to enable the bottom longitudinal rib to penetrate through the node. And, the top longitudinal bar 19 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 16 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 solve the problem of bearing capacity reduction caused by 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 the plastic hinge area at the column end is additionally restrained, the combined column is good in anti-seismic performance and convenient and rapid to connect.
With reference to fig. 3 to 12, the present embodiment further provides a prefabricated assembled concrete and square steel tube combined column, which is obtained by the construction method described above; the composite column comprises: the steel pipe comprises an upper end plate 5, a square steel pipe 1, tie bars 4, stirrups 8, longitudinal bars 7 and a lower end plate 6; the stiffening ribs 3 are welded on the outer side wall of the pipe of the square steel pipe 1, the stiffening ribs 3 are welded on each side wall of the upper end and each side wall of the lower end of the square steel pipe 1 along the longitudinal direction, and the number of the stiffening ribs 3 can be determined according to the constraint requirement of concrete. End plates are welded at two ends of the square steel pipe 1, the end plates are not in contact with the stiffening ribs 3, a plurality of longitudinal ribs 7 are distributed at intervals along the longitudinal direction in a space formed by the two opposite end plates, and a plurality of stirrups 8 bound with the longitudinal ribs 7 are distributed at intervals along the transverse direction to form an internal steel bar framework; stiffening rib 3 wears to be equipped with the trompil, and in the prefabricated stage of combination post, the upper and lower both ends of the lacing wire 4 after will bending many times penetrate stiffening rib 3's trompil to with two adjacent stirrup 8 ligatures, regularly arrange simultaneously in the toe portion plastic hinge district, with the lacing that realizes stirrup 8 and stiffening rib 3. During site operation, a round steel pipe with the diameter equivalent to that of the tie bar 4 is bent to form a 90-degree hook on a straight section of the tie bar 4 penetrating through the hole formed by the stiffening rib 3, so that the stiffening rib 3 is prevented from being separated from the tie bar 4. The bolt pins 11 are welded on the inner surfaces of the upper end plate 5 and the lower end plate 6, bolt holes 12 are reserved in the upper end plate 5 and the lower end plate 6 and used for penetrating the screw 9, and at least part of the screw 9 extends to the inner surface of the end plate; longitudinal formworks are butted between the upper end plate 5 and the lower end plate 6 of the composite column, and a grouting space is reserved between the lower end plate 6 and the supported formworks, so that the ultrahigh-performance concrete 2 is poured from bottom to top, and the formwork supporting and the pouring of the ultrahigh-performance concrete 17 without coarse aggregate are performed at the joint position where the upper composite column and the lower composite column are connected by bolts.
In this embodiment, the present invention further includes a composite beam 15 disposed on the composite column; the construction of the cast-in-place part of the composite column is implemented by the superposed beam 15 through a steel reinforcement framework of the superposed beam, and after the superposed beam 15 and a node area of the composite column are subjected to formwork erection and pouring, a screw 9 penetrates through a cushion layer 16 between the superposed beam 15 and the lower end plate 6 of the upper composite column and is used for butt joint matching between the lower composite column and the upper composite column.
The sectional dimension of the combination column is determined by the axial pressure ratio limit value, and the function of the square steel tube 1 is considered when the axial 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 1 needs to meet the width-to-thickness ratio limit requirement, the width of the stiffening rib 3 is the difference between the cross-sectional dimension of the column and the cross-sectional dimension of the built-in square steel tube 1, the thickness of the stiffening rib is the same as that of the square steel tube, and the number of the stiffening ribs 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 arranged along the longitudinal direction of the composite column, namely the range of the plastic hinge area at the column end, can be approximately 1 time of the cross-sectional dimension of the composite column.
Preferably, the gap between the stiffener 1 and the upper and lower end plates 5, 6 may be taken to be 20mm. Because per two stirrups 8 and the ligature of lacing wire 4, consequently, the interval of holing on the corresponding stiffening rib 3 is stirrup 8 interval plus one times's stirrup 8 diameter, and the aperture ratio lacing wire 4's diameter is 2 to 4mm bigger, and the center of trompil is located the vertical central line of stiffening rib 3.
The space reserved at the bottom of the column end plastic hinge area below the combined column can be 50-100 mm, and the diameter of the longitudinal rib 7 of the combined column can be 8-12 mm. The stirrup 8 is a double-limb hoop, the diameter of which is 8 to 10mm, and the distance between which is 100 to 200mm. The diameter of the lacing wire 4 is 6mm. 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 rod 9 can be about 1/20 of the section size of the column, and the aperture of the bolt hole 12 and the aperture of the nut 10 are matched with the diameter of the screw rod. 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 diameter of the studs 11 welded to the end plates can be 13 to 19mm, the length of the studs can be 80mm, and the distance between the studs can be 1/5 of the side length of the end plates and arranged along the periphery of the end plates.
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 (10)
1. A construction method for a prefabricated assembled concrete and square steel tube combined column is characterized by comprising the following steps:
s1: bending the steel bar section for multiple times to finish the prefabrication of the tie bar;
s2: performing hole opening operation on the stiffening rib according to the preset hole punching position and the hole diameter size;
s3: welding the square steel pipe and the stiffening ribs along each side of the column within the range of the height of the column section size which is one time of the upper end and the lower end of the square steel pipe;
s4: 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; a screw rod penetrates through the bolt hole of the upper end plate, and a nut arranged on one side of the lower surface of the upper end plate is screwed tightly so as to longitudinally fix the screw rod;
s5: penetrating longitudinal bars into the outer side of the square steel pipe from the bottom of the column, sleeving the stirrups, and binding the stirrups and the longitudinal bars together according to a preset interval to form a steel reinforcement framework;
s6: penetrating the tie bar into the opening of the stiffening rib and binding the tie bar with the stirrup, and welding the lower end plate and 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;
s7: and (3) supporting a template between the upper end plate and the lower end plate along the longitudinal direction of the column, reserving a grouting space at the bottom of the column, and pouring and maintaining the ultrahigh-performance concrete of the combined column from bottom to top to finish the prefabrication of the combined column.
2. The construction method of the prefabricated assembled concrete and square steel pipe combined column according to claim 1, further comprising the steps of:
s8: carrying out construction operation on site through the prefabricated combined column;
s9: bending a 90-degree hook on a straight section of the tie bar, which passes through the hole on the stiffening rib, by using a round steel pipe with the diameter equivalent to that of the tie bar; 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 longitudinal rib of a node area, 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;
s10: 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;
s11: pouring a cushion layer of the node area, enabling a screw 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 a screw of the lower combined column into a bolt hole of a lower end plate of the upper combined column, and screwing a nut arranged above the lower end plate of the upper combined column to fix the screw;
s12: and (3) reserving a peripheral formwork at a grouting position at the column bottom of the upper combined column, performing operation of pouring coarse aggregate-free ultrahigh-performance concrete at the connection position connected by bolts, wherein grouting openings and grout outlets are respectively formed in two opposite sides of the formwork, grouting is performed from one side during construction, and the construction is stopped when grout flows out from the other side.
3. The method of constructing a prefabricated concrete and square steel pipe combined column according to claim 2, wherein the step S9 comprises:
and butting the longitudinal ribs of the node area superposed above the upper end plate and the bottom longitudinal ribs of the prefabricated part of the superposed beam together in a mechanical connection mode.
4. The method of constructing a prefabricated concrete and square steel pipe combined column according to claim 3, wherein the step S10 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 combined 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 concrete and square steel pipe combined column according to claim 1, wherein the step S1 comprises:
the concrete steps of bending the linear reinforcing steel bar section into the tie bar are as follows: the two ends of the steel bar section are respectively bent by 90 degrees in the axial plane of the steel bar section, and then two 90-degree hooks are respectively bent at the trisection point of the middle straight line steel bar section along the outside direction of the plane, and the directions of the two hooks are consistent.
6. The method of constructing a prefabricated concrete and square steel pipe combined column according to claim 5, wherein the step S6 comprises:
and the upper end and the lower end of the tie bar penetrate into the opening of the stiffening rib, the tie bar and two adjacent stirrups are bound together, and the two corners of the middle section of the tie bar are clamped on the corresponding stirrups.
7. The method of constructing a prefabricated concrete and square steel pipe combined column according to claim 1, wherein in the steps S4 and S6, the method comprises:
when the upper end plate or the lower end plate is welded, a gap is reserved between the stiffening rib and the adjacent end plate, so that the stiffening rib does not bear vertical load.
8. The method of constructing a prefabricated concrete and square steel pipe combined column according to claim 1, wherein the step S4 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.
9. A prefabricated assembled concrete and square steel pipe combined column obtained by the construction method according to any one of claims 1 to 8; the integrated column comprises: the upper end plate, the square steel pipe, the tie bar, the stirrup, the longitudinal bar and the lower end plate;
the stiffening ribs are welded on the outer side wall of the square steel pipe, and each side wall of the upper end and the lower end of the square steel pipe is longitudinally welded with the stiffening ribs;
end plates are welded at two ends of the square steel pipe, the end plates are not in contact with the stiffening ribs, a plurality of longitudinal ribs are arranged in a space formed by the two opposite end plates at intervals along the longitudinal 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 stiffening ribs are provided with openings, in the prefabrication stage of the combined column, the upper ends and the lower ends of the tie bars which are bent for multiple times are penetrated into the openings of the stiffening ribs, bound with two adjacent stirrups and regularly arranged in the plastic hinge area at the column end; during field construction, a circular steel tube with the diameter equivalent to that of the tie bar is bent to form a 90-degree hook on a straight section of the tie bar, which penetrates through the hole on the stiffening rib;
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;
a longitudinal template is butted between an upper end plate and a lower end plate of the combined column and used for pouring the ultra-high performance concrete, and a grouting space is reserved between the lower end plate and the supported template, so that the ultra-high performance concrete is poured from bottom to top, and the template supporting and coarse aggregate-free ultra-high performance concrete pouring operation are carried out on the connecting position of the upper combined column and the lower combined column which are connected by bolts.
10. The fabricated concrete and square steel tube composite column of claim 9, further comprising a composite beam disposed on the composite 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.
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| CN202211087840.7A CN115370070B (en) | 2022-09-07 | 2022-09-07 | Prefabricated assembled concrete and square steel pipe combined column and construction method thereof |
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| CN103422620A (en) * | 2013-08-27 | 2013-12-04 | 陕西建科兴业钢结构有限公司 | Prefabricated hollow steel-reinforced concrete column and splicing structure and splicing method thereof |
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| CN113638487A (en) * | 2021-05-10 | 2021-11-12 | 中国建筑第五工程局有限公司 | Local superposed beam and prefabricated column joint reinforcing steel bar staggered connection structure and construction method thereof |
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| CN103422620A (en) * | 2013-08-27 | 2013-12-04 | 陕西建科兴业钢结构有限公司 | Prefabricated hollow steel-reinforced concrete column and splicing structure and splicing method thereof |
| CN203583780U (en) * | 2013-10-31 | 2014-05-07 | 中国航空规划建设发展有限公司 | Assembled type bracket-less framework long column |
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