CN111894204A - Steel pipe concrete composite column construction method - Google Patents
Steel pipe concrete composite column construction method Download PDFInfo
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- CN111894204A CN111894204A CN202010586179.9A CN202010586179A CN111894204A CN 111894204 A CN111894204 A CN 111894204A CN 202010586179 A CN202010586179 A CN 202010586179A CN 111894204 A CN111894204 A CN 111894204A
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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
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/42—Foundations for poles, masts or chimneys
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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
- E04G21/02—Conveying or working-up concrete or similar masses able to be heaped or cast
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Abstract
The invention discloses a construction method of a concrete filled steel tube composite column, which comprises the following steps: s1: carrying out deepening design on a steel structure of the superposed column to manufacture a steel pipe column; s2: measuring and positioning and embedding foundation bolts at the construction position of the superposed column; s3: pouring a concrete bearing platform; s4: installing and correcting a steel pipe column on the bearing platform; s5: performing non-shrinkage concrete crack pouring between the top surface of the bearing platform and the column base of the steel pipe column; the stirrup connecting plate is arranged on the outer wall of the steel pipe in the column base range, so that the construction problem that the embedded column base stirrups are connected with the steel pipe is solved, and the stress transmission of the structure is ensured. The process non-woven fabric flexible conduit is adopted to replace a rigid conduit, so that the problems that steel bars of the steel tube concrete composite column are dense, and the conduit cannot convey concrete to the bottom of the column are solved, and the pouring quality of the concrete is guaranteed. And transverse positioning steel bars are welded on the steel pipe column, so that the longitudinal stressed steel bars are prevented from deviating in the construction process, and the thickness of the steel bar protective layer is ensured.
Description
Technical Field
The invention belongs to the technical field of buildings, and particularly relates to a construction method of a concrete filled steel tube composite column.
Background
The steel pipe concrete superposed column is a superposed component with steel pipe concrete arranged in the middle of the section of the steel pipe concrete column, and forms a structural system which is independently developed in China. Compared with reinforced concrete columns and steel pipe concrete columns, the reinforced concrete column has better compression resistance and seismic resistance, can greatly reduce the section size of the column, promotes the using space of buildings, has good economic benefit and practical value, and is widely applied to large-scale public building projects and super high-rise projects. The height of a cover plate layer at the throat area of a six-wire side slope vehicle section of a Western-Ann subway is 10.0m, the height of a garage layer at two layers is 5.0-5.970 m, 3-4 layers of schools and office rooms are developed on an upper cover, the height of the layer is 4.20m, all the layers adopt frame structures, and partial frame columns of the schools and the office rooms adopt beam type conversion at the top of the garage. The first-layer column is located in a track turnout area and is influenced by the limitation of a train, and the position and the section of the column are limited.
In order to meet the requirement of structural calculation under the limited cross section of a frame column, the circular steel tube is arranged in the middle of the reinforced concrete column, so that the requirements of high compression resistance and high ductility of a high-rise building can be met, and the seismic performance of the whole structure is improved. The construction of the steel pipe concrete composite column is complex, the quality requirement is high, the safety of the whole structure is directly influenced by the construction quality of the steel pipe concrete composite column, and the construction process is the key point of construction control.
Disclosure of Invention
The invention provides a construction method of a steel tube concrete composite column, aiming at solving the existing problems.
The invention is realized in this way, a construction method of the steel tube concrete superposed column comprises the following steps:
s1: carrying out deepening design on a steel structure of the superposed column to manufacture a steel pipe column;
s2: measuring and positioning and embedding foundation bolts at the construction position of the superposed column;
s3: pouring a concrete bearing platform;
s4: installing and correcting a steel pipe column on the bearing platform;
s5: performing non-shrinkage concrete crack pouring between the top surface of the bearing platform and the column base of the steel pipe column;
s6: installing embedded column base reinforcing steel bars and pouring concrete;
s7: installing the superposed column steel bars;
s8: installing a superposed column template;
s9: pouring concrete of the superposed columns;
s10: and (4) processing the steel bars of the joint of the concrete beam and the steel pipe column of the composite column.
Further, in step S1, Tekla Structure software is used to perform detail drawing deepening and Structure decomposition on the steel Structure, including node assembling general diagram, node assembling sequence diagram, rod diagram, node diagram and material detail table, and perform computer assembling simulation on the nodes; cutting a plate by using a numerical control precision cutting device, and performing grooving, pipe coiling and assembly welding, wherein the longitudinal seam on the inner side of the steel pipe column is automatically submerged-arc welded, the inner circular seam is CO2 gas shielded welding, and the outer circular seam catching groove is automatically submerged-arc welded.
Further, in step S2, measuring a cross control line of a positioning center of the steel pipe column, nailing cement nails at four corresponding positions, drawing the control line, placing positioning sleeve plates with bolt holes and the same size as those of the steel pipe column base, preferentially installing four corner embedded bolts according to the bolt holes reserved on the steel plate, measuring elevation control points, and welding for fixing; and after the completion, installing the residual bolts according to the positions of the bolt holes in the embedded steel plate.
Further, in step S3, checking is performed before concrete is poured, and the position, elevation, and fixing state are confirmed; when concrete is poured and tamped, the concrete pouring of the bearing platform is carried out from the periphery to the middle, and the vibrating rod does not contact the bolt embedded part; reserving 50-60mm at the column base part when pouring concrete, and adjusting the verticality of the column; and after concrete is poured and pounded, rechecking the elevation and the axis position of the embedded part, and simultaneously cleaning the residual concrete on the embedded bolt rod and the screw port.
Further, in step S4, before installation, the overall dimensions of the steel pipe column, bolt hole diameters and positions, connector positions and angles, welds, stud welds, and paint on the surfaces of the high strength bolt joint friction surface finish quality studs are inspected; checking the serial number of the steel pipe column according to an installation drawing, checking the specification, the size and the open pore position of the steel pipe column, and hoisting in place by using a reserved hoisting hole on the steel pipe column as a hoisting point after the steel pipe column is checked to be correct; after the steel column is in place, the elevation is adjusted firstly, then the torsion is adjusted, and finally the verticality is adjusted, and the axis, the elevation, the verticality, the displacement and the dislocation are corrected by using a laser theodolite and a total station through a relative elevation control method.
Further, in step S5, performing secondary grouting on a gap between the top surface of the bearing platform and the column base of the steel pipe column by using non-shrinkage fine aggregate concrete; and (3) cleaning the surface of the concrete bearing platform during grouting, removing accumulated water, then pouring concrete, pouring and vibrating from one side until the other side overflows and is obviously higher than the lower surface of the base plate when the non-shrinkage fine-stone concrete is poured, and continuously pouring after the pouring is started.
Further, in step S6, after the steel pipe column is installed and the column base non-shrinkage concrete crack pouring is completed, the embedded column base steel bar is installed, the position of the column base stirrup is determined in advance, a full-length stirrup connecting plate is arranged at the corresponding position of the steel pipe column along the column height direction, and stirrup connecting holes are formed in the connecting plate.
Further, in step S9, the concrete composite column is cast by dividing the concrete inside the steel tube into concrete inside the steel tube and concrete outside the steel tube.
Further, the concrete in the steel pipe is discharged by adopting a guide pipe, the concrete is directly vibrated by a vibrating rod, the vibrating time is not less than 30s each time, the casting height of one time is not more than 2m, the concrete in each section of the steel pipe is cast to a position 8OOmm away from the pipe opening, clean stones with large particle diameters are implanted on the surface of the concrete, the large head is upward, about 1/3 is exposed, the knot of new and old concrete on the upper layer and the lower layer of a construction joint is enhanced, water storage maintenance is carried out after the concrete is finally set, and the upper opening is sealed by plastic cloth.
Further, blanking concrete outside the steel pipe by adopting a technical non-woven fabric flexible conduit pipe, blocking the hole when the concrete is poured to the height of the hole, and sequentially carrying out quick insertion and slow pulling on a vibrating rod during vibrating; and after concrete outside the steel pipe is poured, maintaining by adopting a plastic film, and protecting the column base by using a waste template.
Compared with the prior art, the invention has the beneficial effects that:
the optimization of column foot elevation of tubular column to the column foot elevation is located the bearing platform middle part condition, can combine ground (track) elevation position relation, carries out optimization adjustment, through the mode that sets up second order bearing platform (short column) that has the structure reinforcing bar measure, sets up the column foot on the bearing platform top surface, satisfies when burying the degree of depth, reduces the process link of secondary pouring to shorten the time limit for a project.
The steel pipes are connected one by one, so that the hoisting times and splicing times are reduced, the steel consumption and welding quantity of the connecting plates are reduced, the construction period is shortened, and the cost is reduced.
The circumferential steel bars welded on the outer wall of the steel pipe replace the studs, the problem of collision between the column stirrups and the studs is solved, and the concrete pouring quality outside the steel pipe is effectively improved.
The stirrup connecting plate is arranged on the outer wall of the steel pipe in the column base range, so that the construction problem that the embedded column base stirrups are connected with the steel pipe is solved, and the stress transmission of the structure is ensured.
The process non-woven fabric flexible conduit is adopted to replace a rigid conduit, so that the problems that steel bars of the steel tube concrete composite column are dense, and the conduit cannot convey concrete to the bottom of the column are solved, and the pouring quality of the concrete is guaranteed.
And transverse positioning steel bars are welded on the steel pipe column, so that the longitudinal stressed steel bars are prevented from deviating in the construction process, and the thickness of the steel bar protective layer is ensured.
Modeling each steel pipe column through Tekla Structure (steel Structure detailed diagram design software), drawing node big samples of steel bars passing through the steel pipe column positions for embedded column base stirrups, upper beams and column nodes, and reserving stirrup connecting plates, beam column node beam steel bars passing through steel pipe hole positions and hole reinforcing conditions on the steel pipes in advance.
Three-dimensional modeling is carried out through Tekla Structure (steel Structure detailed diagram design software) and BIM technology, the Structure is pre-assembled, the steel pipe is manufactured in a factory, the size precision of steel pipe component processing and manufacturing is improved, the workload of on-site deviation correction and hole supplement is avoided, and the quality and the construction progress are guaranteed.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a technical scheme that:
the steel tube concrete composite column structural member is formed by combining a steel tube, a main reinforcement, a stirrup and a concrete structure. During construction, steel pipes are machined in advance by a steel structure processing factory meeting qualification requirements according to design drawing requirements, then are hoisted and installed by a professional steel structure installation team, and then are delivered to a civil construction team for reinforced concrete construction after the steel pipes are installed and installed.
The construction of the steel pipe concrete superposed column structure comprises the steps of steel pipe column manufacturing and installation, grouting material crack plugging, steel bar binding, template installation, concrete pouring, concrete maintenance, butt welding of the steel pipe columns and the like.
The construction process flow of the steel pipe concrete composite column comprises the following steps:
the method comprises the steps of steel structure deepening design node diagrams → steel pipe column manufacturing, transportation → steel pipe column measurement and positioning → anchor bolt embedding → cushion cap template installation and concrete pouring → steel pipe installation and correction (axis and verticality) → column base shrinkage-free concrete pouring → embedded column base steel bar installation → column base template installation, concrete pouring → column steel bar installation → column template installation → column concrete pouring (pouring to the beam bottom) → disc buckle type full hall support erection → beam bottom die installation → beam steel bar installation → beam side mold and plate template installation → plate steel bar installation → beam and plate concrete pouring.
In the embodiment, the steel Structure deepening design and manufacturing adopts Tekla Structure software to deepen detailed diagrams and decompose structures, the detailed diagrams include a node assembly general diagram, a node assembly sequence diagram, a rod diagram, a node diagram, a material detail table and the like, computer assembly simulation is carried out on complex nodes, a data file is sent to a numerical control precision cutting device to cut plates, grooving, pipe coiling and assembly welding work are carried out, longitudinal joints on the inner side of a column pipe are subjected to automatic submerged arc welding, inner joints are subjected to CO2 gas shielded welding, and outer joint buckling grooves are subjected to submerged arc automatic welding.
And 4 steel plates are welded on the radial double-sided fillet weld of the steel pipe and used for connecting the upper layer steel pipe column and the lower layer steel pipe column, and the width of the steel plate extends out of the outer side of the steel pipe column by 12 mm. Two ends of the column tube are cut into 4 slots (the width is larger than the thickness of the fins by 2mm) along the axis, and the fin cores are inserted into the slots of the column tube and welded along the whole length of the connecting part, so that the same roundness of the fin cores is ensured, and stress concentration is eliminated.
The steel structure hole of the steel pipe superposed column is mainly a bolt and steel bar through hole, and is drilled and processed by a numerical control machine; accurate lofting of a computer is carried out before steel pipe bar penetrating holes are formed, and installation positioning lines are arranged on the steel pipes, so that the difficulty in penetrating bars caused by installation errors is avoided.
When the positioning and the embedding of foundation bolts are measured, after the installation of steel bars at the bottom of a bearing platform is finished, firstly measuring a cross control line of a positioning center of a pay-off steel column, nailing cement nails at corresponding four positions, drawing the control line, placing positioning sleeve plates with bolt holes and the same size as those of a steel column base, preferentially installing four corner embedded bolts according to the reserved bolt holes on a steel plate, measuring elevation control points, and welding for fixing; and after the completion, residual bolts are installed according to the positions of the bolt holes in the embedded steel plate, and the verticality of the embedded bolts is controlled by paying attention in the construction process.
When the concrete of the bearing platform is poured, the concrete is rechecked before the concrete is poured, and the pouring process can be carried out after the position and the elevation of the concrete are confirmed to be accurate and the concrete is firmly fixed. When concrete is poured and tamped, concrete pouring of a bearing platform is carried out from the periphery to the middle, the vibrating rods cannot touch the bolt embedded parts, experienced specially-assigned persons are dispatched to monitor the embedded parts, and deviation is found and is timely processed.
When pouring the foundation concrete, the column base part is reserved with 50-60mm (compared with the designed elevation of the bottom of the steel column) for adjusting the verticality of the column. And after the foundation concrete is tamped, re-checking the elevation and the axis position of the embedded part to ensure that the embedded part has no displacement in the concrete pouring process. And simultaneously cleaning the residual concrete on the embedded bolt rod and the screw hole.
The installation and correction of the steel pipe column are carried out, before the installation, the overall inspection of the paint on the surfaces of the bolt parts, which is used for processing the overall dimension, the bolt hole diameter and the position of the component, the position and the angle of the connecting piece, the welding seam, the bolt welding and the high-strength bolt joint friction surface processing quality, of the component is carried out, and the installation work can be carried out only after the requirements of design documents and related standards are met.
And checking the number of the steel column according to an installation drawing, checking whether the specification, the size and the opening position of the steel pipe column meet the requirements of a design drawing, and after checking that the steel pipe column is correct, using a reserved hoisting hole on the steel pipe column as a hoisting point to hoist in place. After the steel column is in place, the elevation is adjusted firstly, then the torsion is adjusted, and finally the verticality is adjusted, and the axis, the elevation, the verticality, the displacement and the dislocation are corrected by using a laser theodolite and a total station through a relative elevation control method.
In the present embodiment, when the toe non-shrinkage concrete is grouted, the gap between the top surface of the bearing platform and the toe is secondarily grouted using non-shrinkage (one strength level higher than that of the base concrete) fine aggregate concrete. And (3) cleaning the surface of the foundation concrete during grouting, removing accumulated water, then pouring concrete, pouring and vibrating from one side when pouring the shrinkage-free fine-stone concrete until the other side overflows and is obviously higher than the lower surface of the base plate, and strictly pouring in turn from more than two directions. The pouring must be carried out continuously after the start of pouring, without interruption and with as short pouring times as possible.
Buryying formula column base steel bar installation and concrete placement, steel-pipe column installation and the column base do not have to bury formula column base steel bar installation after the shrinkage concrete crack pouring is accomplished, according to the design requirement, buryying formula column base should be reliably connected with the steel-pipe column, for the installation quality of guaranteeing steel-pipe column and column base reinforcing bar, in carrying out the secondary design process of deepening, confirm column base stirrup position in advance, set up logical long hoop stirrup connecting plate along the column height direction in the steel-pipe column department of correspondence, connect and set up the hoop reinforcement connecting hole. The embedded column foot concrete pouring is used for reinforcing the vibration of the periphery of the steel pipe column and ensuring the concrete pouring quality of the steel pipe column stiffening plate and the connecting plate.
When the column steel bars are installed, the steel bar binding of the concrete filled steel tube composite column is basically the same as that of a common concrete column. The column main reinforcement is mainly four-grade steel of 36 and 40, and adopts straight thread connection, and because of single heavy, the installation often uses machinery or fixed pulley to lift by crane the cooperation installation.
1 way of positioning stirrup is welded on the steel pipe column at intervals of 1.5m along the height direction of the column, longitudinal steel bars and the positioning stirrups are bound firmly, and the longitudinal stressed steel bars of the column are prevented from being disturbed and deviating when concrete is poured.
The stirrup is an important steel bar component which plays a role in restraining concrete in the steel tube concrete laminated structure, and must be completely closed and firmly connected with the main bar. The binding edge column stirrup consists of a rectangular stirrup and a tie bar, the stirrup is designed into phi 12, 14 and 16 steel bars, the hardness is high, and the adjustability is poor. The blanking length and the bending angle are strictly controlled during the steel bar processing, and the smooth installation of the finished stirrup is ensured. In order to accelerate the progress of engineering and facilitate construction, a U-shaped or L-shaped opening stirrup is commonly used, and then the U-shaped or L-shaped opening stirrup is welded into a closed stirrup on site. The welding position should avoid the main rib to avoid damaging the main rib. The main reinforcement connecting screw head is required to be protected in the installation process of the stirrup, and once the main reinforcement connecting screw head is damaged, the main reinforcement connecting screw head cannot be repaired.
When the column template is installed, the section of the engineering concrete filled steel tube composite column is a cylinder, and the steel template is completely prepared for the column in consideration of the characteristics of large height and large section size of the column. After the steel bars are installed, the vertical structure template is installed after the steel bars are approved to be concealed by the inspection and acceptance of a supervisory unit, the construction of the steel pipe concrete composite column concrete structure template is basically the same as that of a common reinforced concrete structure template, the pouring junction surface of the previous procedure (bearing platform) needs to be pre-leveled, column template positioning measures are set, gaps are filled with mortar or foam to be compact, and root rot is prevented.
When the concrete of the column is poured, the concrete filled steel tube composite column is poured by the concrete inside the steel tube and the concrete outside the steel tube 2. The concrete compactness of the steel pipe concrete composite column is guaranteed, and the phenomenon that the concrete is separated due to high throwing is avoided, so that the concrete compactness of the steel pipe concrete composite column is guaranteed through concrete raw material selection, optimization of a pouring method, control of the concrete falling height and adoption of a secondary pouring method.
Concrete pouring is carried out in the superposed column pipe, the concrete in the pipe is fed through a guide pipe, a vibrating rod directly vibrates the concrete, the vibrating time is not less than 30s each time, the pouring height of one time is not more than 2m, the concrete in each section of steel pipe is poured to a position 8OOmm away from the pipe opening, clean stones with large particle sizes are implanted into the surface of the concrete, the large head is upward, about 1/3 is exposed, the knot of new and old concrete on the upper layer and the lower layer of a construction joint is enhanced, water storage maintenance is carried out after the concrete is finally set, the upper opening is sealed by plastic cloth, and construction waste is prevented from entering the inside of the steel pipe.
For preventing that the concrete from leading to the concrete to appear the segregation problem because of the free fall height is too big when pouring, guarantee that the concrete can accurately get into the region that needs pour, cloth pole increases 1 non-woven fabrics hose at its pump line discharge gate, and hose discharge gate and intraductal concrete distance remain throughout about lm, both made things convenient for the control of pouring in-process to the concrete placement and made things convenient for the hose to remove when the concrete is poured in succession again.
Before a section of steel column is installed, accumulated water and sundries in the pipe are removed completely. The quality of concrete pouring in the pipe can be checked by knocking the steel pipe, ultrasonic detection can be carried out if the concrete pouring quality is abnormal, a drilling and grouting method is adopted to reinforce the non-compact part, and then the drilling hole is subjected to repair welding and sealing.
Concrete outside the laminated column tube is poured, the thickness of the concrete outside the steel tube is only 200mm, the hooping outside the steel tube is dense, and the blanking funnel cannot go deep into the interior, so that the technical non-woven fabric flexible conduit is adopted to replace a rigid conduit for blanking. And (5) blocking the holes when the concrete is poured to the height of the holes. During vibration, the vibrating rod adopts quick insertion and slow pulling, and the operation is carried out in sequence, so that the leakage vibration is prevented, and the collision between the vibrating rod and the stirrup is prevented during vibration.
Through the control to the concrete mix proportion and the vibration of reinforcing concrete in the steel pipe to the cooperation mallet strikes steel-pipe column outer wall all around, has guaranteed the closely knit nature of the inside concrete of steel pipe, thereby has improved the intensity of concrete and steel pipe concrete's rigidity and stability greatly. After the construction method is adopted, the concrete filled steel tube composite column is subjected to knocking method inspection and ultrasonic detection, and the compactness of concrete in the steel tube meets the design requirement.
And after the concrete in the pipe is poured, covering the exposed part of the upper part, and watering and maintaining. After the concrete outside the pipe is poured, a plastic film is covered for maintenance, and the column base is protected by a waste template. When the concrete in the steel tube is poured in winter, the temperature of the concrete in the steel tube is higher than 15 ℃. When the outdoor temperature is lower than 5 ℃ and higher than-10 ℃, the steel pipe is heated and wrapped and covered before the concrete is poured.
The method is characterized in that steel bars of concrete beams and steel pipe column joints are processed, and the superposed column joints in the engineering adopt wound steel bar joints.
The reinforced concrete ring beam node is applied to a steel pipe concrete structure more frequently, and because reinforced concrete still exists outside the pipe of the steel pipe concrete composite column, the adoption of the reinforced concrete ring beam node in the composite column structure is more beneficial. According to the engineering beam column joint, beam part main reinforcements are bent in a beam 1:6 natural bending mode to wind off steel pipes, part of the main reinforcements are anchored into a ring beam, three-dimensional lofting is carried out on the arrangement of the ring reinforcements and stirrups, various dimensional relationships are determined, and large and accumulated blanking is carried out after no error is confirmed. And (3) arranging a ring beam processing area at the first floor on the site, binding the ring beam in advance, wherein the ring rib adopts a welding and sealing mode, hoisting a reinforcement cage for positioning after the bottom die of the ring beam is finished, and constructing other frame beams around. The stirrup in the core area range of the beam column node plays an important role in improving the ductility of a concrete filled steel tube frame and the seismic capacity of the node, so the structure requirement of the stirrup is very important, the construction of the closed stirrup is very difficult, and therefore the column stirrup is processed into a U-shaped open stirrup by adopting the method, and the closed stirrup is welded.
The longitudinal and transverse beam steel bars pass through the steel pipe column in a staggered manner, and the insertion sequence of various steel bars is comprehensively considered in construction so as to facilitate better and rapid construction.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The construction method of the steel pipe concrete composite column is characterized by comprising the following steps of:
s1: carrying out deepening design on a steel structure of the superposed column to manufacture a steel pipe column;
s2: measuring and positioning and embedding foundation bolts at the construction position of the superposed column;
s3: pouring a concrete bearing platform;
s4: installing and correcting a steel pipe column on the bearing platform;
s5: performing non-shrinkage concrete crack pouring between the top surface of the bearing platform and the column base of the steel pipe column;
s6: installing embedded column base reinforcing steel bars and pouring concrete;
s7: installing the superposed column steel bars;
s8: installing a superposed column template;
s9: pouring concrete of the superposed columns;
s10: and (4) processing the steel bars of the joint of the concrete beam and the steel pipe column of the composite column.
2. The construction method according to claim 1, wherein in step S1, Tekla Structure software is used to perform detail map deepening and Structure decomposition on the steel Structure, including node assembling general map, node assembling sequence map, rod member map, node map and material detail table, and perform computer assembling simulation on the nodes; cutting plates by using a numerical control precision cutting device, and performing groove opening, pipe coiling and assembly welding, wherein the longitudinal seam on the inner side of the steel pipe column is subjected to automatic submerged arc welding, and the inner circumferential seam is subjected to CO welding2And gas shielded welding, wherein the outer annular seam catching groove is automatically submerged arc welding.
3. The construction method according to claim 1, wherein in step S2, a cross control line for positioning center of the steel pipe column is measured, cement nails are nailed into corresponding four positions, the control line is pulled, a positioning sleeve plate with the same bolt holes and size as those of the steel pipe column base is placed, four corner embedded bolts are preferentially installed according to the reserved bolt holes on the steel plate, and elevation control points are measured and fixed by welding; and after the completion, installing the residual bolts according to the positions of the bolt holes in the embedded steel plate.
4. The construction method according to claim 1, wherein in step S3, the concrete is rechecked before casting, and the position, elevation and fixing state are confirmed; when concrete is poured and tamped, the concrete pouring of the bearing platform is carried out from the periphery to the middle, and the vibrating rod does not contact the bolt embedded part; reserving 50-60mm at the column base part when pouring concrete, and adjusting the verticality of the column; and after concrete is poured and pounded, rechecking the elevation and the axis position of the embedded part, and simultaneously cleaning the residual concrete on the embedded bolt rod and the screw port.
5. The construction method according to claim 1, wherein in step S4, before installation, the overall dimensions of the steel pipe column, bolt hole diameter and position, joint position and angle, weld, stud welding, paint on the surface of the high strength bolt joint friction surface finish quality stud is inspected; checking the serial number of the steel pipe column according to an installation drawing, checking the specification, the size and the open pore position of the steel pipe column, and hoisting in place by using a reserved hoisting hole on the steel pipe column as a hoisting point after the steel pipe column is checked to be correct; after the steel column is in place, the elevation is adjusted firstly, then the torsion is adjusted, and finally the verticality is adjusted, and the axis, the elevation, the verticality, the displacement and the dislocation are corrected by using a laser theodolite and a total station through a relative elevation control method.
6. The construction method according to claim 1, wherein in step S5, the gap between the top surface of the bearing platform and the column foot of the steel pipe column is secondarily grouted with non-shrinkage fine aggregate concrete; and (3) cleaning the surface of the concrete bearing platform during grouting, removing accumulated water, then pouring concrete, pouring and vibrating from one side until the other side overflows and is obviously higher than the lower surface of the base plate when the non-shrinkage fine-stone concrete is poured, and continuously pouring after the pouring is started.
7. The construction method according to claim 1, wherein in step S6, after the steel pipe column is installed and the toe non-shrinkage concrete is grouted, the embedded toe rebar is installed, the toe stirrup position is determined in advance, a full-length stirrup connecting plate is arranged at the position corresponding to the steel pipe column along the column height direction, and the stirrup connecting plate is provided with a stirrup connecting hole.
8. The construction method according to claim 1, wherein the concrete composite column is cast by dividing the concrete inside the steel pipe into concrete inside the steel pipe and concrete outside the steel pipe at step S9.
9. The construction method according to claim 8, wherein the concrete inside the steel tube is discharged by a guide tube, the concrete is directly vibrated by a vibrating rod for not less than 30s each time, the height of one casting is ensured to be not more than 2m, the concrete in each section of the steel tube is cast to a position 8OOmm away from the tube opening, clean stones with large grain size are implanted on the surface of the concrete, the large head is upward, about 1/3 is exposed, the Here junction of new and old concrete on the upper layer and the lower layer of a construction joint is enhanced, water storage maintenance is carried out after the concrete is finally set, and the upper opening is sealed by plastic cloth.
10. The construction method according to claim 9, wherein concrete outside the steel pipe is fed by a technical non-woven fabric flexible conduit pipe, the hole is sealed when the concrete is poured to the height of the hole, and the vibrating rod is pulled by fast insertion and slow pulling during vibrating; and after concrete outside the steel pipe is poured, maintaining by adopting a plastic film, and protecting the column base by using a waste template.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010586179.9A CN111894204A (en) | 2020-06-24 | 2020-06-24 | Steel pipe concrete composite column construction method |
Applications Claiming Priority (1)
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| CN113356634A (en) * | 2021-07-05 | 2021-09-07 | 中铁上海设计院集团有限公司 | Bar planting connection method applied to vehicle section upper cover development |
| CN114016621A (en) * | 2021-11-26 | 2022-02-08 | 中铁十局集团城建工程有限公司 | Reinforced concrete beam and assembly type structure construction method thereof |
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| CN114182581A (en) * | 2021-12-27 | 2022-03-15 | 中铁二局集团有限公司 | Accurate positioning die for reserved bolt hole and positioning method thereof |
| CN115055857A (en) * | 2022-06-30 | 2022-09-16 | 重庆中环建设有限公司 | Method for embedding rail of cement mineral aggregate blanking bin |
| CN115478696A (en) * | 2022-08-31 | 2022-12-16 | 重庆建工住宅建设有限公司 | Construction method of steel pipe concrete composite column |
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