CN108824852B - Large-scale arc-shaped steel frame stand space positioning and mounting construction method - Google Patents
Large-scale arc-shaped steel frame stand space positioning and mounting construction method Download PDFInfo
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- CN108824852B CN108824852B CN201810535419.5A CN201810535419A CN108824852B CN 108824852 B CN108824852 B CN 108824852B CN 201810535419 A CN201810535419 A CN 201810535419A CN 108824852 B CN108824852 B CN 108824852B
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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
- E04H3/00—Buildings or groups of buildings for public or similar purposes; Institutions, e.g. infirmaries or prisons
- E04H3/10—Buildings or groups of buildings for public or similar purposes; Institutions, e.g. infirmaries or prisons for meetings, entertainments, or sports
- E04H3/12—Tribunes, grandstands or terraces for spectators
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- Engineering & Computer Science (AREA)
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Abstract
The invention discloses a space positioning and installation construction method for a large arc-shaped steel frame grandstand, which comprises the following steps of: s1. mounting a stand steel structure; s2, installing a profiled steel sheet; s3. binding the steel bars of the inclined grandstand and pouring concrete; s4. mounting a stand steel frame; s5. construction of stand platform; s6. seat positioning and air opening; the arc-shaped steel frame stand is spatially positioned and installed, compared with a concrete stand, the construction speed is high, the construction period of the stand is saved through the technology, and a working surface is created for the interpenetration of other subsequent processes; saving cost and having good economic and social benefits.
Description
Technical Field
The invention relates to the field of steel frame stand construction, in particular to a space positioning and installation construction method for a large arc-shaped steel frame stand.
Background
In recent years, with the continuous development of economy, domestic large-scale venues, theaters and the like are continuously upgraded and updated, and most of the steel structures are steel structures. For satisfying spectator's field of vision and comfort level, the bleacher is mostly arc step bleacher, and each step height is all inequality, and the accuracy of bleacher construction location is especially important.
In the project of a faithful county electric competition venue, the inclined platform of the indoor grandstand is of a steel structure and concrete combined structure, and the arc-shaped step type audience grandstand is of a steel frame and concrete structure. 6000 seats are arranged in the venue, the maximum circular arc radius of the platform is 41m, and 4500 independent air supply outlets are arranged below the seats. The heights of the stands are different in each step, the air supply outlets are embedded, the positioning requirement is high, and the positioning difficulty of the inclined platforms is high. After various factors are comprehensively considered, a set of systematic and complete construction technology, namely a large-scale arc-shaped steel frame grandstand space positioning and mounting construction technology, is formed in the indoor grandstand construction process.
Disclosure of Invention
In view of the above, the present invention provides a space positioning and installation construction method for a large arc-shaped steel frame grandstand.
The invention discloses a space positioning and installation construction method of a large-scale arc-shaped steel frame grandstand, which comprises the following steps: s1. mounting a stand steel structure; s2, installing a profiled steel sheet; s3. binding the steel bars of the inclined grandstand and pouring concrete; s4. mounting a stand steel frame; s5. construction of stand platform; s6. seat positioning and air opening;
further, in step s1, manufacturing and transporting factory parts to a construction site, erecting a truss assembling jig frame on the site to assemble the steel truss, and then integrally hoisting;
further, in step s2, in the construction of laying and installing the profiled steel sheets, the main profiled steel sheets are laid firstly in a large area, and then the auxiliary edge sealing and end plugging plates are laid and installed;
further, in step s2, the installation steps of the peg are: s21, placing the stud in a clamping device of the welding gun, placing a protective porcelain ring with a corresponding diameter on the base material, and inserting the stud into the porcelain ring and contacting the base material; s22, pressing a power switch, automatically lifting the stud and exciting an electric arc; s23, increasing welding current to melt the end part of the stud and the base metal; s24, automatically pressing the stud into the base metal after the set arc combustion time is reached; s25, cutting off the current, solidifying the molten metal and keeping the welding gun still; and S26, after cooling, forming uniform annular weld reinforcement on the end surface of the stud, breaking and removing the protective ceramic ring.
Further, in step s4, the steel frame construction method includes the following steps:
s41, basic layer measurement plate: the width, the height and the whole arc shape of the stand are arranged, the positions of the walkway steps are reserved, and the neat, beautiful and smooth effect after construction is ensured;
s42, blanking the steel skeleton of the stand by arranging the BIM and the stand subarea inside to ensure the finished surface elevation of the stand; performing cold bending treatment on the horizontal rectangular pipe;
s43. snapping line: before the ground keel is installed, popping up a bottom row altitude on the ground, making a control line on the ground, and popping up a dividing line according to the typesetting size; before the keel on the platform is installed, a line is bounced according to a row plate by adopting a ground back projection method;
and s44, installing a buried plate: the buried plate adopts 200 × 10mm galvanized steel plates and is fixed by 4M 12 chemical anchor bolts;
s45, fully welding a steel skeleton and a buried plate by adopting a 60 x 5mm galvanized rectangular pipe, ensuring the straightness and the verticality, filling a welding line, coating anti-rust paint at the welding line, coating silver paint at the welding line, and cleaning welding slag before coating the anti-rust paint;
s46, fixing the self-tapping screws of the double-layer 18mm fireproof plates as the side surfaces on the side steel frames, and keeping the elevation consistent with that of the self-leveling terrace;
and s47, welding a pattern steel plate with the thickness of 2mm above the steel skeleton on the steel skeleton, and keeping the steel plate horizontal.
Further, in step s5, the reinforced concrete base layer construction method includes the steps of:
s511, cleaning up sundries such as floating soil, oil stains and the like on the surface of the steel plate; when the surface of the building is greasy, the building is cleaned by using 5% -10% caustic soda solution;
s512, the steel bars are arranged in a phi 6.5@100 two-way mode and are welded and fixed with the steel plates;
step 513, before concrete pouring and tamping, watering and wetting;
s514, adopting C20 fine-stone concrete as concrete;
step s515, after concrete is tamped, a flat vibrator is used for vibrating and compacting;
s516, leveling by using an aluminum alloy scraper to ensure that no raised ground can be formed;
s517, before final setting of concrete, collecting slurry by using an iron plate, and performing press polishing;
and S518, curing the concrete after pouring for 24 hours, and controlling the water evaporated by the self hydration heat of the concrete not to be lost by adopting a plastic film covering method, so that the aim of curing is fulfilled, and the curing time is more than 7 days.
Further, in step s5, the self-leveling construction process includes the following steps:
s521, coating one layer of water-based primer before self-leveling construction, uniformly mixing the two components according to a ratio, adding a certain proportion of water, and uniformly mixing for use;
s522, starting self-leveling construction after the base primer is dried; pouring 6 liters of clean cold water into a stirring barrel, slowly adding the powder, stirring by using a stirrer with stirring slurry while stirring until the powder is uniform and free of agglomeration, wherein the stirring is carried out for about 2 minutes, and the stirring is stopped for about 30 seconds and then slowly stirred for about 30 seconds; during stirring, wood chips are used for scraping residual cement blocks into the barrel along the barrel wall;
s523, conveying the mixture to a region needing to be paved, pouring the mixture on a base layer according to workload, and uniformly paving the mixture by using a trowel or a special scraping tooth; if possible, should be coated to the required thickness in one step; defoaming the self-leveling by using a defoaming roller along with laying;
s524, if the construction cannot be completed in the same day and a working seam needs to be reserved, performing slope type seam treatment on the working seam;
s525, mixing the thick mixture, adding the coarse quartz sand, wherein the ratio can reach 2: 1;
s526.24-48 hours later, polishing and dust collection can be carried out; grinding with No. 40-60 abrasive paper according to different conditions to improve the surface effect and the absorptivity; poor ventilation environment and lower temperatures can significantly affect drying time.
Further, in step s5, the rubber floor construction process includes the steps of:
s531, after the rubber floor is transported to the site, the rubber floor is placed on the site for more than 24 hours, so that the memory of the material is restored, and the temperature is consistent with that of the construction site;
s532; before the construction of the rubber floor, the self-leveling is subjected to fine grinding polishing treatment, and the requirement is to polish the self-leveling surface to a large-area floodlight state to expose a solid surface;
s533, after self-leveling polishing, sealing the polishing pad, and sucking dust by using a dust collector to keep the ground clean;
s534, pre-laying the rubber floor, wherein the pre-laying aims to find whether the rubber floor has the defects of color difference, different sizes and the like;
s535, coating and scraping the adhesive; the adhesive is prepared in proportion and is uniformly coated and scraped on the self-leveling surface, and when the adhesive is coated and scraped, the adhesive is uniform and has moderate component; after the binder is dried, the rubber floor is paved;
s536, when the rubber floor is laid, the arrow direction of the back of the rubber floor is kept consistent, and the seamless laying of the rubber floor is achieved as far as possible;
s537, rolling the paved rubber floor back and forth by using a 50kg steel press roller to discharge air so as to fully bond the rubber floor and the base layer; pressing the small rollers with hand to spread and press the joints and corners of the rubber floor to make the joints smooth;
s538, after paving is finished, pedestrians can use the paving tool after 24 hours; before use, the surface is cleaned and coated with liquid wax for three times;
further, in step s6, after the construction of the rubber floor of the platform is completed, a total station and a theodolite are adopted to position the seats of the stand, the positions of the seats are 400mm away from the inner side of the platform, and the horizontal distance is 600 mm; and after the seat is accurately positioned, positioning the platform air port again, and drilling holes by using water after the air port is positioned.
The invention has the beneficial effects that: according to the invention, the air port is reserved on the stand, so that the profiled steel plate is adopted, the steel bar truss floor bearing plate cannot meet the requirement, if the audience stand adopts a solid concrete structure, the load of a steel structure foundation of the stand is increased, the material waste is caused, meanwhile, the step heights of each step are different, the loss rate of the template is increased, the template is difficult to reinforce, the quality of the concrete finish surface is difficult to ensure, the concrete finish surface is optimized into a steel frame and concrete structure form, under the condition of meeting the functional requirement, the using amount of concrete is saved, the load of the steel structure foundation of the stand is reduced, the overall safety of the structure is increased, meanwhile, BIM modeling and three-dimensional positioning are adopted, the flatness and the verticality of the finish surface of the stand are greatly improved, the elevation of the stand is more accurately controlled, and the visual field requirement of the audience is met.
Drawings
FIG. 1 is a flow chart of the overall construction process of the present invention;
FIG. 2 is a schematic view showing a deepening laying direction of a profiled steel sheet according to the present invention;
FIG. 3 is a schematic view of longitudinal butt joint of profiled steel sheets according to the present invention;
fig. 4 is a schematic view of the lateral overlapping fixing manner of the profiled steel sheet of the present invention.
FIG. 5 is a schematic view of the edge folding of the profiled steel sheet and the steel beam according to the present invention;
FIG. 6 is a flow chart of the stud installation of the present invention;
FIG. 7 is a schematic view of the installation of the peg of the present invention;
FIG. 8 is a schematic view of the stand reinforcement of the present invention;
FIG. 9 is a basic view of the stand of the present invention;
FIG. 10 is a layout of a steel frame of the stand of the present invention;
FIG. 11 is a diagram of the stand template positioning of the present invention.
Detailed Description
The construction method of the embodiment comprises the following specific steps:
s1, mounting of steel structures of stands
According to the characteristics of the engineering truss, most truss structures need to be assembled on site, so factory spare parts are manufactured and transported to a construction site, truss assembling bed-jigs are erected on site to assemble the steel truss, and then the steel truss is integrally hoisted.
The assembling sequence should be ahead of the hoisting sequence, but the using number of the assembling jig frames should be saved, two factors are comprehensively considered, and the construction cost is saved to the maximum extent and the construction period is shortened.
Installation process: job preparation → small splicing unit → middle splicing unit → assembly acceptance → delivery and hoisting → welding → post-repair rod installation.
S2, installation of profiled steel sheets
1) Order of installation
When the profiled steel sheets in the same floor plane are laid, the laying is carried out according to the principle of firstly laying a main radiation road inside and outside; for the unit structure layer with a plurality of floors, a method of pre-laying profiled steel sheets is adopted, namely, a top layer is laid firstly, and a lower layer is laid secondly, so that the safety of lower layer installation construction is ensured.
The construction sequence of laying and installing the profiled steel sheets can be executed according to the principle of 'big first and small second, long first and short second, main first and auxiliary second'.
Big first and small last: namely, firstly paving a large-area and then paving a small-area;
length first and short second: namely, the profiled steel sheets are paved firstly, and then are paved, wherein the length of the profiled steel sheets is long, and the length of the profiled steel sheets is relatively short;
primary and secondary: namely, the main profiled steel sheet is paved firstly, and then the auxiliary sealing edge, the auxiliary plugging plate and the like are paved and installed.
2) The requirements for field cutting are as follows
3) Profiled steel sheet construction method
Before laying, steel beam surface dirt should be cleaned, and the lifting lug cutting area is polished, so that the profiled steel sheet is ensured to be attached to the steel beam. And (4) correcting the profiled steel sheet with bending and twisting, wherein the gap between the plate surface warping and the top surface of the steel beam is controlled within 1 mm.
After the surface of the steel beam is processed, the central line of the steel beam needs to be popped out in a plate paving area to be used as a control line for paving the fixed position of the profiled steel plate. And controlling the lapping width of the profiled steel sheet lapping steel beam by the central line, and determining the welding spot position of the profiled steel sheet and the steel beam in fusion welding.
As shown in fig. 2, when laying the profiled steel sheet, laying is performed according to the layout drawing with the female rib as a starting edge. Laying the profiled steel sheet from one end to the other end, and taking the last profiled steel sheet as an adjusting plate. In the laying process, spot welding is carried out in time for fixation, so as to prevent loosening and slipping. The fixed profiled steel sheet can be used as a channel for manually carrying the profiled steel sheet.
As shown in fig. 3, when the profiled steel sheet is laid, the adjacent span needs to adjust the plate ribs while laying, and the position of the profiled steel sheet is corrected in time. The lap joint of profiled steel sheet and girder steel is not less than 50mm, and the spot welding interval is fixed once for every rib groove spot welding. When the profiled steel sheet is supported on the angle steel, the profiled steel sheet and the angle steel need to be welded firmly. When welding, a thin welding rod and a small current are adopted to prevent the profiled steel sheet from being burnt into holes.
As shown in FIG. 4, the side lap joints between the profiled steel sheet plates are "male-female joint", and in order to prevent the steel sheets from separating due to load, the side lap joints should be fixed or spot-welded with #12(φ 5) self-tapping screws, with a maximum pitch of 900 mm. Angle steel supports are arranged at the joint of the profiled steel sheet and the steel column and at the plate end according to a design drawing, so that a stable and reliable system is formed. The stair edge, the stair hole and the outer frame overhanging part need to be sealed by the edge baffle for plugging treatment, so that the concrete is prevented from falling.
For the part of the profiled steel sheet in the local area, which cannot meet the load requirement in the construction stage, needing to be erected with the temporary support, the temporary support is erected in time before the profiled steel sheet is laid, and the transverse support distance is determined according to the size of the sleeper and the load borne by each support.
And ejecting a cutting line after the profiled steel sheet is positioned, and cutting along the line. The position of the cutting line should be checked by referring to the floor hole-reserving drawing and the arrangement drawing; if the profiled steel sheet is damaged due to wrong cutting, the plate shape and the plate length are recorded and a supplier is informed of replenishment in time; the on-site corners, the pillar edges and the reinforcing plates need to be cut. A plasma cutting machine is required to be adopted for field cutting of the profiled steel sheet, the cutting surface is as flat as possible, flame cutting is forbidden, and the damage to the surface zinc coating of the profiled steel sheet is avoided.
As shown in fig. 5, in the laying process of the profiled steel sheet, because the size of the steel beam and the specification of the profiled steel sheet do not have the same modulus, a certain gap exists at the edge of the steel beam, and the part with the gap distance larger than 200mm is sealed by cutting the profiled steel sheet; and for the part with the gap distance less than 200mm, a special edge closing plate is adopted for sealing.
Before the concrete is not poured, any construction on the finished surface of the profiled steel sheet should be absolutely prohibited from damaging the sectional shape of the profiled steel sheet, so as not to reduce the load-bearing capacity of the profiled steel sheet.
When concrete is poured, the outlet position of a concrete pumping pipe is arranged at the position with a steel beam below. The concrete must be spread at any time, and the concrete should not be locally piled up to prevent the profiled steel sheet from collapsing.
After the concrete is poured, if the material is to be stacked on the floor, the material should be supported by the pallet to avoid concentrated load and should be placed above the main structural rod.
The holes (except for steel beams and concrete baffles) on the floor slab are reserved, the surrounding formwork is firstly carried out, and after the concrete is poured and the strength reaches 75%, profiled steel plates can be cut. The periphery of the opening is provided with reinforcing steel bars according to the structural design according to the reinforcing mode of the reinforced concrete opening. The spool, upper and lower water and the fire control pipeline that pass the floor should trompil in advance, if destroy the slab rib, in order to prevent that the construction stage concreting from making the steel carrier plate local collapse, should add the angle steel reinforcement in the hole both sides perpendicular to slab rib direction before concreting.
2. Stud construction
1) Mounting method
Stud installation method
2) Description of the installation method
The stud is welded after being connected with a proper power supply by adopting an automatic adjusting welding device, and the stud is required to be supplied with power by adopting an independent power supply.
If two or more bolt guns are used on the same power supply, a linkage is used to ensure that only one bolt gun can be used at a time. Thus, the power supply can start the next welding after one bolt is welded. The welding voltage, current, time and the parameters of the pin gun lifting and inserting need to be adjusted to the optimal state. This will be done based on past experience and specifications of the peg manufacturer and the equipment manufacturer.
Each pin is provided with a ceramic ring to protect the heat of the arc and stabilize the arc. The arc protection ceramic ring is kept dry, and if the surface has dew and rain traces, the arc protection ceramic ring is dried in a drier at 120 ℃ for 2 hours and then is used.
Where the studs are welded, there should be no rust, dust, dew or other substances which are harmful to the production of a satisfactory weld.
During operation, the nail gun can be moved after the to-be-welded seam is solidified. After welding, the ceramic ring is removed for inspection. Manual arc welding may be used if the nail gun is not available for use or for rework of an insufficient stud. The concrete construction method is shown in fig. 7.
S3. binding of reinforcing steel bars of inclined bleachers and concrete pouring
1. Binding of reinforcing steel bars
After the profiled steel sheets and the studs are installed, the steel bars can be bound, and the arrangement of the stand steel bars is shown in figure 8. The inclined plates in the area of the 1-4 layers of the stand are made of profiled steel plates, double-sided hot-dip galvanized steel plates are adopted, the height of wave crests is 65mm, the distance between wave crests is 185mm, the thickness of a floor slab is 150mm, and the strength grade of concrete is C35.
2. Air port pre-embedding
In order to consider the vision of audiences, the elevation of each step of the step type grandstand is different, the requirement on the elevation is strict in the construction process, and the paying-off is required to be accurate. In order to ensure the measurement paying-off precision, a reference of the project is firstly established, the project takes the center of a circle in a venue as the reference, the project is divided into zones in a divergent mode, and a second-level control network is established after the project is repeatedly confirmed to be error-free through an outdoor control network. According to the datum points and the lines, the geometric relationship between the point lines and the geometric dimension between the point lines are checked by the total station through the prism in consideration of the error of the temperature difference to the measurement and the error caused by uneven ground, and the construction precision of the grandstand is improved through the precision of the point lines.
And partitioning the arc-shaped stand by taking the circle center as a reference point and the center line of the stand walkway as an auxiliary line, marking coordinates on each partition line through a CAD drawing, and establishing a secondary measurement control network by combining the reference point. Determining the side line of each step and the central line of the air port through a total station and a theodolite, and pre-embedding the air port opening by adopting a PVC pipe according to the requirement of the air port interval 600.
3. Concrete pouring of grandstand
1) Distributing pipe arrangement
The stand plate is an inclined plate, the slump of concrete is small, preferably about 170, and the concrete is conveyed and poured by a concrete land pump. The free height of concrete falling from the opening of the pump pipe is not more than 2m, and measures such as pipe stringing, chute and the like must be taken when the pouring exceeds 3 m.
2) Pouring sequence
The concrete pouring of the stand inclined plate is performed by parallel subsection from bottom to top, and uniform blanking is strictly forbidden at one place. The method comprises the following steps of firstly pouring bottom platform concrete, and secondly pouring the upper part from the sloping position of the sloping plate in a co-working mode. The concrete sloping plate of the stand must be continuously poured.
S4, mounting of steel frame of stand
The stand steel frame adopts a 60 × 5 rectangular pipe, the upper part of the stand steel frame adopts a galvanized steel plate with the thickness of 2mm, and the steel frame and the sloping platform structure are fixed by adopting a steel plate and chemical bolts, which is specifically shown in fig. 9.
1. Steel frame construction process
1) Base layer measurement row board: the width, the height and the whole arc arrangement of the stand reserve the positions of the walkway steps, and ensure the neat, beautiful and smooth effect after construction.
2) The steel framework of the stand is blanked by internally installing the BIM and the stand subarea, so that the finished surface elevation of the stand is ensured. And performing cold bending treatment on the horizontal rectangular pipe.
3) Line snapping:
firstly, popping up a bottom row altitude on the ground before the ground keel is installed, making a control line on the ground, and popping up a dividing line according to the typesetting size.
Secondly, line snapping is carried out according to a ground inverse projection method before keel installation on the platform.
4) Installing a buried plate: the buried plate was made of 200 × 10mm galvanized steel and fixed by 4M 12 chemical anchors.
5) The steel skeleton adopts 60 × 5mm galvanized rectangular pipes, and is fully welded with the buried plate, so that the straightness and the perpendicularity are ensured, the welding seam is full, the welding seam is coated with the anti-rust paint once, the silver paint once, and welding slag must be cleaned before the anti-rust paint is coated.
6) The self-tapping screws of the double-layer 18mm fireproof plate are used as the side surface and fixed on the side steel frame, and the elevation is kept consistent with that of the self-leveling terrace.
7) And a steel plate with a pattern of 2mm thickness above the steel skeleton is welded on the steel skeleton to keep the steel plate horizontal.
S5, stand platform construction
1. Reinforced concrete base layer construction process
1) Cleaning up sundries such as floating soil, oil stains and the like on the surface of the steel plate; when the surface of the building is greasy, the building is cleaned by using 5% -10% caustic soda solution.
2) The steel bars are arranged in a phi 6.5@100 two-way mode and are welded and fixed with the steel plates.
3) Before concrete is concreted, water is firstly sprayed for moistening.
4) The concrete is C20 fine-stone concrete.
5) After concrete is poured and tamped, a flat vibrator is used for vibrating and compacting.
6) And the aluminum alloy scraper is used for scraping, so that the condition that no convex ground exists is ensured.
7) Before final setting of concrete, the slurry is collected by an iron plate and is polished.
8) And (3) curing the concrete after 24 hours of pouring, and controlling the water evaporated by the self hydration heat of the concrete not to be lost by adopting a plastic film covering method so as to achieve the purpose of curing, wherein the curing time is more than 7 days.
2. Self-leveling construction process
1) Before construction self-leveling, firstly brushing one time with a water-based primer, uniformly mixing the two components according to a ratio, adding a certain proportion of water, and uniformly mixing for use;
2) and starting self-leveling construction after the base primer is dried. 6 liters of clean cold water is poured into a stirring barrel, the powder is slowly added, a stirrer with stirring slurry is used for stirring while stirring until the powder is uniform and has no agglomeration, the stirring is carried out for about 2 minutes, and the stirring is stopped for about 30 seconds and then slowly stirred for about 30 seconds. The residual cement cake was scraped into the drum along the drum wall using wood chips while stirring.
3) The mixture is transported to the area to be laid and poured onto the substrate according to the workload, and is spread evenly with trowels (when the substrate is uneven) or special scraping teeth (when the substrate is relatively flat). If possible, should be applied in one pass to the desired thickness. Defoaming is carried out on the self-leveling by using a defoaming roller along with laying.
4) If the construction can not be completed in the day and a working seam needs to be reserved, the working seam is subjected to slope type seam treatment.
5) To prepare a thicker mixture, mixing the mixture, and then adding coarse quartz sand, wherein the proportion can reach 2: 1.
6) and polishing and dust collection can be carried out after 24-48 hours. And according to different conditions, the surface effect and the absorptivity are improved by adopting No. 40-60 abrasive paper for polishing. Poor ventilation environment and lower temperatures can significantly affect drying time.
3. Rubber floor construction process
1) After the rubber floor is transported to the site, the rubber floor is placed on the site for more than 24 hours, so that the memory of the material is restored, and the temperature is consistent with that of the construction site.
2) Before the construction of the rubber floor, the self-leveling is subjected to fine grinding polishing treatment, and the requirement is to polish the self-leveling surface to a large area for floodlight to expose a solid surface.
3) After self-leveling polishing, the self-leveling polishing machine is sealed, and a dust collector is used for collecting dust to keep the ground clean.
4) The rubber floor is pre-laid, and the purpose of pre-laying is to find whether the rubber floor has the defects of color difference, different sizes and the like.
5) And (4) coating and scraping the adhesive. The adhesive is prepared according to the proportion, is uniformly coated and scraped on the self-leveling surface, and when coating and scraping are carried out, the uniform and moderate component is required. After the adhesive dries (generally, it is preferable not to stick to the hands), the rubber floor begins to be laid.
6) When the rubber floor is paved, the arrow direction on the back of the rubber floor is kept consistent, and the seamless paving of the rubber floor is achieved as far as possible.
7) Rolling the laid rubber floor back and forth by using a 50kg steel press roller, and exhausting air to fully bond the rubber floor and the base layer; the small rollers are pressed by hand to spread and press the joint seam and the edge of the rubber floor, so that the joint seam is smooth.
8) After the pavement is finished, the pedestrian can use the electric blanket 24 hours later. Before use, the surface is cleaned and coated with liquid wax for three times.
Seat positioning and air opening
After the construction of platform rubber floor is accomplished, adopt total powerstation and theodolite to fix a position stand seat, 400mm, horizontal interval 600mm in the seat position apart from the platform. And after the seat is accurately positioned, positioning the platform air port again, and drilling holes by using water after the air port is positioned.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (2)
1. A space positioning and installation construction method for a large arc-shaped steel frame bleacher is characterized in that: the method comprises the following steps:
s1. mounting a stand steel structure;
s2, installing a profiled steel sheet;
s3. binding the steel bars of the inclined grandstand and pouring concrete;
s4. mounting a stand steel frame;
s5. construction of stand platform;
s6. seat positioning and air opening;
in step s1, manufacturing and transporting factory parts to a construction site, erecting a truss assembling jig frame on the site to assemble a steel truss, and then integrally hoisting;
in the step s2, in the construction of laying and installing the profiled steel sheets, firstly laying a large area of the main profiled steel sheet, and then laying and installing auxiliary edge sealing and end plugging plates;
in step s2, the installation steps of the peg are:
s21, placing the stud in a clamping device of the welding gun, placing a protective porcelain ring with a corresponding diameter on the base material, and inserting the stud into the porcelain ring and contacting the base material;
s22, pressing a power switch, automatically lifting the stud and exciting an electric arc;
s23, increasing welding current to melt the end part of the stud and the base metal;
s24, automatically pressing the stud into the base metal after the set arc combustion time is reached;
s25, cutting off the current, solidifying the molten metal and keeping the welding gun still;
s26, after cooling, forming uniform annular weld reinforcement on the surface of the end part of the stud, breaking and removing the protective ceramic ring;
in step s4, the steel frame construction method includes the following steps:
s41, basic layer measurement plate: the width, the height and the whole arc shape of the stand are arranged, the positions of the walkway steps are reserved, and the neat, beautiful and smooth effect after construction is ensured;
s42, blanking the steel skeleton of the stand by arranging the BIM and the stand subarea inside to ensure the finished surface elevation of the stand; performing cold bending treatment on the horizontal rectangular pipe;
s43. snapping line: before the ground keel is installed, popping up a bottom row altitude on the ground, making a control line on the ground, and popping up a dividing line according to the typesetting size; before the keel on the platform is installed, a line is bounced according to a row plate by adopting a ground back projection method;
and s44, installing a buried plate: the buried plate adopts 200 × 10mm galvanized steel plates and is fixed by 4M 12 chemical anchor bolts;
s45, fully welding a steel skeleton and a buried plate by adopting a 60 x 5mm galvanized rectangular pipe, ensuring the straightness and the verticality, filling a welding line, coating anti-rust paint at the welding line, coating silver paint at the welding line, and cleaning welding slag before coating the anti-rust paint;
s46, fixing the self-tapping screws of the double-layer 18mm fireproof plates as the side surfaces on the side steel frames, and keeping the elevation consistent with that of the self-leveling terrace;
s47, welding a pattern steel plate with the thickness of 2mm above the steel skeleton on the steel skeleton, and keeping the steel plate horizontal;
in step s5, the reinforced concrete base layer construction method comprises the following steps:
s511, cleaning up the floating soil and oil stain sundries on the surface of the steel plate; when the surface of the building is greasy, the building is cleaned by using 5% -10% caustic soda solution;
s512, the steel bars are arranged in a phi 6.5@100 two-way mode and are welded and fixed with the steel plates;
step 513, before concrete pouring and tamping, watering and wetting;
s514, adopting C20 fine-stone concrete as concrete;
step s515, after concrete is tamped, a flat vibrator is used for vibrating and compacting;
s516, leveling by using an aluminum alloy scraper to ensure that no raised ground can be formed;
s517, before final setting of concrete, collecting slurry by using an iron plate, and performing press polishing;
s518, curing the concrete after pouring for 24 hours, and controlling the water evaporated by the self hydration heat of the concrete not to be lost by adopting a plastic film covering method so as to achieve the purpose of curing, wherein the curing time is more than 7 days;
in step s5, the self-leveling construction process comprises the following steps:
s521, coating one layer of water-based primer before self-leveling construction, uniformly mixing the two components according to a ratio, adding a certain proportion of water, and uniformly mixing for use;
s522, starting self-leveling construction after the base primer is dried; pouring 6 liters of clean cold water into a stirring barrel, slowly adding the powder, stirring by using a stirrer with stirring slurry while stirring until the powder is uniform and free of agglomeration, wherein the stirring is carried out for about 2 minutes, and the stirring is stopped for about 30 seconds and then slowly stirred for about 30 seconds; during stirring, wood chips are used for scraping residual cement blocks into the barrel along the barrel wall;
s523, conveying the mixture to a region needing to be paved, pouring the mixture on a base layer according to workload, and uniformly paving the mixture by using a trowel or a special scraping tooth; if possible, should be coated to the required thickness in one step; defoaming the self-leveling by using a defoaming roller along with laying;
s524, if the construction cannot be completed in the same day and a working seam needs to be reserved, performing slope type seam treatment on the working seam;
s525, mixing the thick mixture, adding the coarse quartz sand, wherein the ratio can reach 2: 1;
s526.24-48 hours later, polishing and dust collection can be carried out; grinding with No. 40-60 abrasive paper according to different conditions to improve the surface effect and the absorptivity; poor ventilation environment and lower temperatures can significantly affect drying time;
in step s5, the rubber floor construction process includes the steps of:
s531, after the rubber floor is transported to the site, the rubber floor is placed on the site for more than 24 hours, so that the memory of the material is restored, and the temperature is consistent with that of the construction site;
s532; before the construction of the rubber floor, the self-leveling is subjected to fine grinding and polishing treatment, and the self-leveling surface is required to be polished to be floodlight in a large area to expose a solid surface;
s533, after self-leveling polishing, sealing the polishing pad, and sucking dust by using a dust collector to keep the ground clean;
s534, pre-laying the rubber floor, wherein the pre-laying aims to find whether the rubber floor has the defects of color difference and inconsistent size;
s535, coating and scraping the adhesive; the adhesive is prepared in proportion and is uniformly coated and scraped on the self-leveling surface, and when the adhesive is coated and scraped, the adhesive is uniform and has moderate component; after the binder is dried, the rubber floor is paved;
s536, when the rubber floor is laid, the arrow direction of the back of the rubber floor is kept consistent, and the seamless laying of the rubber floor is achieved as far as possible;
s537, rolling the paved rubber floor back and forth by using a 50kg steel press roller to discharge air so as to fully bond the rubber floor and the base layer; pressing the small rollers with hand to spread and press the joints and corners of the rubber floor to make the joints smooth;
s538, after paving is finished, pedestrians can use the paving tool after 24 hours; before use, the surface is cleaned and coated with liquid wax for three times.
2. The method of claim 1, wherein in step s6, after the rubber floor construction of the platform is completed, a total station and a theodolite are used to position the seats of the grandstand, the positions of the seats are 400mm from the inner edge of the platform and the horizontal distance is 600 mm; and after the seat is accurately positioned, positioning the platform air port again, and drilling holes by using water after the air port is positioned.
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| CN114991376B (en) * | 2022-07-27 | 2022-11-04 | 中国建筑第二工程局有限公司 | Installation structure of corridor-containing comprehensive hall based on BIM technology and construction method thereof |
| CN116752678B (en) * | 2023-06-20 | 2023-12-05 | 广东省建筑工程集团有限公司 | Pouring molding construction process for recycled aggregate blocks of inclined plates of steel bar truss floor support plates |
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