CN117027036A - Construction method for reinforcing steel bar support of large-volume concrete bottom plate - Google Patents
Construction method for reinforcing steel bar support of large-volume concrete bottom plate Download PDFInfo
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- CN117027036A CN117027036A CN202311009288.4A CN202311009288A CN117027036A CN 117027036 A CN117027036 A CN 117027036A CN 202311009288 A CN202311009288 A CN 202311009288A CN 117027036 A CN117027036 A CN 117027036A
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- 238000010276 construction Methods 0.000 title claims abstract description 71
- 239000004567 concrete Substances 0.000 title claims abstract description 29
- 229910001294 Reinforcing steel Inorganic materials 0.000 title claims description 47
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 176
- 239000010959 steel Substances 0.000 claims abstract description 176
- 238000003466 welding Methods 0.000 claims abstract description 52
- 238000000034 method Methods 0.000 claims abstract description 39
- 239000000463 material Substances 0.000 claims abstract description 30
- 230000008569 process Effects 0.000 claims abstract description 20
- 238000002360 preparation method Methods 0.000 claims abstract description 16
- 108010068370 Glutens Proteins 0.000 claims abstract description 11
- 235000021312 gluten Nutrition 0.000 claims abstract description 11
- 238000012360 testing method Methods 0.000 claims description 23
- 239000010410 layer Substances 0.000 claims description 15
- 238000012545 processing Methods 0.000 claims description 15
- 238000005520 cutting process Methods 0.000 claims description 9
- 238000009412 basement excavation Methods 0.000 claims description 7
- 238000007689 inspection Methods 0.000 claims description 7
- 238000005070 sampling Methods 0.000 claims description 7
- 238000005452 bending Methods 0.000 claims description 6
- 239000011449 brick Substances 0.000 claims description 6
- 238000012547 material qualification Methods 0.000 claims description 6
- 238000005259 measurement Methods 0.000 claims description 6
- 238000000465 moulding Methods 0.000 claims description 6
- 239000003973 paint Substances 0.000 claims description 6
- 238000011014 quality assurance certificate Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 230000003014 reinforcing effect Effects 0.000 claims description 5
- 230000007547 defect Effects 0.000 claims description 4
- 230000002159 abnormal effect Effects 0.000 claims description 3
- 238000013461 design Methods 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims description 3
- 238000012797 qualification Methods 0.000 claims description 3
- 239000002023 wood Substances 0.000 claims description 3
- 238000013459 approach Methods 0.000 claims description 2
- 238000004364 calculation method Methods 0.000 claims description 2
- 239000011241 protective layer Substances 0.000 claims description 2
- 230000002787 reinforcement Effects 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 8
- 238000004458 analytical method Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000011150 reinforced concrete Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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
- E02D27/01—Flat foundations
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/16—Auxiliary parts for reinforcements, e.g. connectors, spacers, stirrups
- E04C5/18—Spacers of metal or substantially of metal
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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
- E04G21/12—Mounting of reinforcing inserts; Prestressing
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/08—Lining with building materials with preformed concrete slabs
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/12—Temporary supports for use during building; Accessories
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0004—Synthetics
- E02D2300/0018—Cement used as binder
- E02D2300/002—Concrete
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- Engineering & Computer Science (AREA)
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- Architecture (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Paleontology (AREA)
- Conveying And Assembling Of Building Elements In Situ (AREA)
Abstract
The invention discloses a construction method for a large-volume concrete bottom plate steel bar support, which comprises the following steps: s1: preparing a construction plan; s2: preparing a construction machine; s3: excavating; s4: positioning an upright post; s5: welding the upright post seat cushion; s6: welding the stand column; s7: welding an intermediate structural layer; s8: welding of gluten brackets. According to the method for constructing the large-volume concrete bottom plate steel bar support, the binding quality of the bottom plate steel bar and the operation safety of the bottom plate construction can be ensured, and through preparation of a construction technology, whether the construction technology is available or not in the construction process can be ensured, so that each constructor can clear and know the construction technology, the construction precision is ensured, meanwhile, the material is processed according to the specification, the construction precision can be ensured, the problem of subsequent reworking can be avoided, and the upright post can be flexibly adjusted according to the actual condition of the site.
Description
Technical Field
The invention relates to the field of building construction, in particular to a method for supporting and constructing a large-volume concrete bottom plate steel bar.
Background
The concrete bottom plate steel bar support is a support built by prefabricated reinforced concrete members or poured reinforced concrete, has the advantages of high bearing capacity, capacity of bearing two hundred tons per support, difficult deformation and low repair rate, and is mainly used for supporting deep well soft salt tunnels, underground yards and air houses.
When carrying out the construction of bulky concrete bottom plate reinforcing bar support, because the engineering volume of bottom plate reinforcing bar is great, consider that the distance between raft bottom bar and the gluten is great, ordinary support, split heads etc. have been unable to use to this lacks comparatively effectual construction scheme and guarantees the ligature quality of bottom plate reinforcing bar and the operation safety of bottom plate construction.
Disclosure of Invention
The invention mainly aims to provide a large-volume concrete bottom plate steel bar support construction method which can effectively solve the problems in the background technology.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a construction method for a large-volume concrete bottom plate steel bar support comprises the following operation steps:
s1: preparation of a construction plan: the construction plan comprises technical preparation and material preparation, wherein the technical preparation comprises that all construction technicians participating in construction must be familiar with drawings and site conditions in advance, blanking processing is carried out on materials of a steel bar support frame in advance, safe technical bottom-crossing work is carried out according to design drawings, construction specifications and construction scheme requirements, each concrete operator is ensured to know a technological operation process, key procedure operators master operation rules and operation processes, measurement paying-off personnel pay out axes, walls and column position lines according to the drawings, obvious marks are used for paint, and report construction units for checking and rechecking, meanwhile pay out steel bar support frame positioning lines, reasonable arrangement of steel bar supports is ensured, steel bar approach is carried out, steel bar material proof and timely recheck are carried out, the technical sampling test work of welding test pieces is carried out in advance according to the specification requirements, the material preparation needs to check each frequent material, and material qualification proof and delivery quality assurance certificate are required;
s2: preparing a construction machine: the device comprises a steel bar cutting machine, a grinding wheel cutting machine, a steel bar bending machine, a steel bar straightening machine, a steel bar numerical control forming machine, a steel bar numerical control bending machine, a metal section bar cutting machine, an electric welding machine, a total station and a leveling instrument;
s3: and (3) excavation: after the foundation slab and the bearing platform earthwork are excavated, a C20 concrete cushion layer with the thickness of 200 percent is poured in time, a bearing platform brick moulding bed is built, the earth side of the pit bottom is not disturbed, after the brick moulding bed and the pile foundation are detected, binding of reinforcing steel bars at the bottom of the base slab is carried out according to the drawing requirements, the reinforcing steel bars at the bottom of the base slab are pushed to ramp openings from the periphery as a whole according to the flowing water construction principle, and the reinforcing steel bar binding of a deep foundation pit is synchronously carried out;
s4: positioning an upright post: firstly, accurately positioning a support upright post according to a deepening drawing, and marking positioning on a bottom steel bar by using red paint;
s5: welding a stand column seat cushion: welding a column seat made of 8# channel steel to a bottom reinforcing steel bar on a channel steel column positioning point in the super-thick raft area of the core tube;
s6: welding stand columns: according to different thicknesses, the core tube super-thick raft area takes 8# channel steel with different calculated lengths as a support upright post, the bottom of the core tube super-thick raft area is welded and fixed with the 8# channel steel seat cushion, and the upright post is temporarily and obliquely fixed by steel bars or angle steel;
s7: welding an intermediate structural layer: l50x5 angle steel is used as a longitudinal and transverse horizontal support, an intermediate structural layer of the bracket is welded, a wood scaffold board is required to be placed on a next structural layer when the upper layer horizontal support is welded, and a simple horizontal support welding operation table is built;
s8: welding of gluten brackets: and (3) the upper node of the support is welded and fixed with the upright column by using L50x5 angle steel, then the upper 8# channel steel beam is welded, the main stress beam 8# channel steel is required to be perpendicular to the arrangement direction of the reinforcing steel bars at the bottommost row, the binding operation of the bottom plate reinforcing steel bars is carried out on the support body after the whole welding of the support body is finished, the safety of the reinforcing steel bar support frame is considered, the temporary concentrated stacking of the reinforcing steel bars is strictly forbidden on the upper part of the support frame, and when the concrete horizontal pump pipe is arranged on the upper part of the bottom plate reinforcing steel bar, an upright column is additionally arranged between the two upright columns of the reinforcing steel bar support frame in the range below the pump pipe for reinforcement.
2. The construction method for supporting steel bars of a large-volume concrete floor according to claim 1, wherein the steel bars for supporting at the same time are required to have a material qualification certificate and a delivery quality assurance certificate, the materials of the construction party, a quality member, a steel bar responsibility engineer and a supervision are used for checking, checking the specification, the model, the performance, the quantity and the identification of the steel bars, checking the appearance quality and whether the steel bars are damaged in the transportation process, checking the product qualification certificate and the delivery inspection report, immediately reporting the related personnel to treat the steel bars according to the unqualified products once the obvious appearance defect or the steel bars which are not in compliance with the requirements are found, the related records are made by project materials, the steel bars are required to be hung with no less than two labels on each bundle when delivered, marks such as a manufacturer mark, a steel number, a furnace number, a diameter and the like are printed, the steel bars without label bundles cannot be received and used, when the steel bar enters a construction site, the steel bar should be checked and accepted in batches, and in the processing process of the steel bar, if the brittle failure, poor welding performance or remarkable abnormal mechanical performance of the steel bar are found, the steel bar should be immediately stopped, the chemical composition analysis is needed, the steel bar can be continuously used after being confirmed to be qualified, the surface of the steel bar should not be cracked, folded, scarred, eared and slag-clamped, the protruding blocks on the surface of the ribbed steel bar should not exceed the height of the transverse rib, the mechanical property and weight deviation test is carried out on the incoming steel bars according to standard sampling of the specification, the steel bars can be used after being qualified, the sampling inspection quantity of the steel bars is not more than 60t per batch, the steel bars can be used after being qualified through repeated tests, if the steel bars are unqualified, the double number of test pieces are taken from the same batch for the reworking test, and if the test pieces are still unqualified, the steel bars are unqualified and cannot be directly used in engineering.
Preferably, the construction site needs to be provided with at least 3 tower cranes, the hoisting radius covers the whole construction area and peripheral material yards, the horizontal material transportation requirement is met, and meanwhile, corresponding numbers of steel bar binding workers, welding workers and profile steel processing workers are needed to be prepared.
Preferably, because more water pits and elevator foundation pits exist on the foundation slab during excavation, the positions of the column and the cross rod of the support frame are required to be considered, and the positioning deepening treatment is required to be carried out on the support column of the ultra-thick bottom slab of the core tube.
Preferably, the upper node of the core tube ultra-thick bottom plate steel bar support is provided with a main stress beam 8# channel steel which is required to be perpendicular to the arrangement direction of the bottom row of the gluten, the specific elevation of the bottom row of the gluten is determined by the work length of the site steel bars, and the theoretical elevation of the top of the main stress beam = the elevation of the bottom plate surface-the thickness of the protective layer-the gluten thickness.
Preferably, the stand column positioning of the support is accurately fixed by measurement, and attention needs to be paid to the fact that the on-site dewatering well possibly collides with the stand column positioning point, so that the stand column positioning can be flexibly adjusted on site according to conditions.
Preferably, the welding requirements of the bracket channel steel and the angle steel are four-side girth welding, the welding is full, the height of the welding seam is 6mm, and the width is more than or equal to 8mm.
Preferably, the upright posts are arranged on the bottom plate steel bars through the base, and the bottom plate steel bars are different in height, so that the length of the upright posts is slightly longer than the calculated theoretical length when the upright posts are fed, and after the bracket is welded, the upright posts are leveled by measuring uniform elastic wires and are higher than part of channel steel to be cut off, so that the leveling of the upper parts of the bracket is ensured.
Preferably, when the soleplate is bound, the problems of the basic form and the on-site elevation of the soleplate, the lofting of the reinforcing steel bar and the processing difficulty are required to be paid attention to, so that the binding quality is required to be ensured.
Preferably, the processing heights of the steel bar supports and the split heads accurately calculate the processing heights of the supporting frames used in different positions according to the specifications of the upper and lower rows of steel bars and the thickness of the protective layer and marks respectively, so that the steel bar supports and the split heads are convenient to take.
Compared with the prior art, the invention has the following beneficial effects:
the method can ensure the binding quality of the bottom plate reinforcing steel bars and the operation safety of the bottom plate construction, and can ensure that each constructor can clear the construction process by preparing the construction technology and whether the construction technology is available or not in the construction process, so that the construction precision is ensured, meanwhile, the material treatment is carried out according to the specification, the construction precision is ensured, and the problem of subsequent reworking can be avoided.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention relates to a construction method for a large-volume concrete bottom plate steel bar support, which comprises the following operation steps:
s1: preparation of a construction plan: the construction plan comprises technical preparation and material preparation, wherein the technical preparation comprises that all construction technicians participating in construction are required to be familiar with drawings and site conditions in advance, blanking processing is carried out on materials of the steel bar support frame in advance, safe technical interchange work is carried out according to design drawings, construction specifications and construction scheme requirements, each specific operation worker is ensured to know the technological operation process, key procedure operation workers master operation rules and operation processes, measurement paying-off workers pay-off axes, walls and column position lines according to the drawings, the obvious identification of paint is carried out, the construction units are reported to carry out inspection and recheck, meanwhile, the steel bar support frame positioning lines are paid-out, reasonable arrangement of the steel bar support frame is ensured, steel bar access is carried out, steel bar material evidence is submitted and rechecked in time, the process sampling test work of a welding test piece is carried out in a straight thread connection mode strictly according to the specification requirement before a large number of steel bars are processed, the material preparation needs to check each frequent material, a material qualification certificate and a delivery quality assurance certificate are needed, meanwhile, the supporting steel bars at the entrance are needed to have the material qualification certificate and the delivery quality assurance certificate, the materials, the quality personnel and the steel bar responsibility engineers of the construction party and the supervision are used for checking and checking the specification, model, performance, quantity and identification of the steel bars, checking the appearance quality and whether the steel bars are damaged in the transportation process, checking the product qualification certificate and the delivery inspection report, once the steel bars with obvious appearance defects or inconsistent requirements are found, the related personnel should be immediately reported to process according to the unqualified products, the project materials are needed to make related records, the steel bars are needed to be hung with at least two labels on each bundle when leaving the factory, marks such as a factory label, a steel number, a furnace number, a diameter and the like are printed, the steel bars without the bundle of labels cannot be received and used, when the steel bar enters a construction site, the steel bar should be checked and accepted in batches, and in the processing process of the steel bar, if the brittle failure, poor welding performance or remarkable abnormal mechanical performance of the steel bar are found, the steel bar should be immediately stopped, the chemical composition analysis is needed, the steel bar can be continuously used after being confirmed to be qualified, the surface of the steel bar should not be cracked, folded, scarred, eared and slag-clamped, the protruding blocks on the surface of the ribbed steel bar should not exceed the height of the transverse rib, the mechanical property and weight deviation test is carried out on the incoming steel bars according to standard sampling of the specification, the steel bars can be used after being qualified, the sampling inspection quantity of the steel bars is not more than 60t per batch, the steel bars can be used after being qualified through repeated tests, if the steel bars are unqualified, the double number of test pieces are taken from the same batch for the reworking test, and if the test pieces are still unqualified, the steel bars are unqualified and cannot be directly used in engineering.
S2: preparing a construction machine: the steel bar straightening machine comprises a steel bar cutting machine, a grinding wheel cutting machine, a steel bar bending machine, a steel bar straightening machine, a steel bar numerical control forming machine, a steel bar numerical control bending machine, a metal section cutting machine, an electric welding machine, a total station and a level gauge, wherein at least 3 tower cranes are required to be arranged on a construction site, the hoisting radius covers the whole construction area and a peripheral material storage yard, the horizontal transportation requirement of materials is met, and meanwhile, corresponding numbers of steel bar binding workers, welding workers and profile steel processing workers are required to be prepared.
S3: and (3) excavation: after foundation slab and cushion cap earthwork excavation are completed, 200 thick C20 concrete cushion layers are poured in time, cushion cap brick moulding bed is built, pit bottom earth side is not disturbed, after brick moulding bed and pile foundation detection are completed, binding of bottom plate bottom reinforcing steel bars is carried out according to drawing requirements, bottom plate bottom reinforcing steel bars are pushed in all around to ramp openings according to flowing water construction principle, reinforcing steel bar binding of deep foundation pit is carried out synchronously, and during excavation, more water collecting pits and elevator foundation pits exist on the foundation slab, so that the positions of column and cross rod supports of a support frame are needed to be considered, and positioning deep treatment is needed to be carried out on the support column of the ultra-thick bottom plate of a core tube.
S4: positioning an upright post: firstly, accurately positioning the stand column of the bracket according to a deepening drawing, and marking the positioning on the steel bar at the bottom by using red paint.
S5: welding a stand column seat cushion: on the core tube ultra-thick raft area channel steel column positioning points, a column seat made of 8# channel steel is welded to bottom reinforcing steel bars, the upper node of a core tube ultra-thick bottom plate reinforcing steel bar support is welded, the 8# channel steel of a main stress beam is required to be perpendicular to the arrangement direction of the reinforcing steel bars in the bottommost row of the reinforcing steel bars, the specific elevation of the reinforcing steel bars in the bottommost row of the reinforcing steel bars is determined by the work length of the field reinforcing steel bars, and the theoretical elevation of the top of the main stress beam = the elevation of the bottom plate surface-the thickness of the protective layer-the thickness of the reinforcing steel bars.
S6: welding stand columns: according to different thicknesses, the core tube super-thick raft area takes 8# channel steel with different calculation lengths as a support stand column, the bottom of the core tube super-thick raft area is welded and fixed with the 8# channel steel seat cushion, the stand column is temporarily inclined and fixed by steel bars or angle steel, the support stand column is positioned by a precise measurement fixed point, and attention is required to be paid to the fact that a site dewatering well possibly collides with stand column positioning points, so that the stand column positioning can be flexibly adjusted according to conditions on site.
S7: welding an intermediate structural layer: the L50x5 angle steel is used as a longitudinal and transverse horizontal support, an intermediate structural layer of the bracket is welded, when an upper layer of horizontal support is welded, a wood scaffold board is required to be placed on a next structural layer, and a simple horizontal support welding operation table is erected.
S8: welding of gluten brackets: the method comprises the steps of firstly welding and fixing angle steel with an L50x5 angle steel and an upright column, then welding an upper 8# channel steel beam, enabling a main stress beam 8# channel steel to be perpendicular to the arrangement direction of the lowest row of the reinforcing steel bars, carrying out binding operation of the reinforcing steel bars of the bottom plate on the support body after the whole welding of the support body is completed, taking the safety of a reinforcing steel support frame into consideration, strictly forbidden to carry out temporary concentrated stacking of the reinforcing steel bars on the upper portion of the support body, adding an upright column between two upright columns of the reinforcing steel support frame in the lower range of a pump pipe to strengthen the reinforcing steel bars of the bottom plate when the upper portion of the reinforcing steel bar of the bottom plate is provided with a concrete horizontal pump pipe, enabling the welding requirements of the channel steel and the angle steel to be four-sided girth welding, enabling the welding to be full, enabling the welding height to be 6mm, enabling the width to be larger than or equal to 8mm, enabling the length to be slightly longer than the theoretical length when the upright column is arranged on the reinforcing steel bars, enabling the length to be slightly longer when the blanking of the reinforcing steel bars to be calculated, enabling the support frame to be finished after the welding to be completed, and enabling the upper portion of the reinforcing steel bars to be cut off to be uniformly, enabling the supporting steel bars to be higher than the portion to be flat, enabling the base steel bar to be required to pay attention to be measured, and the standard to be equal to the standard, and the quality of the reinforcing steel bar to be different from the quality to be measured to be different from the quality.
The method can ensure the binding quality of the bottom plate reinforcing steel bars and the operation safety of the bottom plate construction, and can ensure that each constructor can clear the construction process by preparing the construction technology and whether the construction technology is available or not in the construction process, so that the construction precision is ensured, meanwhile, the material treatment is carried out according to the specification, the construction precision is ensured, and the problem of subsequent reworking can be avoided.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A method for constructing a large-volume concrete bottom plate steel bar support is characterized by comprising the following steps: the method comprises the following operation steps:
s1: preparation of a construction plan: the construction plan comprises technical preparation and material preparation, wherein the technical preparation comprises that all construction technicians participating in construction must be familiar with drawings and site conditions in advance, blanking processing is carried out on materials of a steel bar support frame in advance, safe technical bottom-crossing work is carried out according to design drawings, construction specifications and construction scheme requirements, each concrete operator is ensured to know a technological operation process, key procedure operators master operation rules and operation processes, measurement paying-off personnel pay out axes, walls and column position lines according to the drawings, obvious marks are used for paint, and report construction units for checking and rechecking, meanwhile pay out steel bar support frame positioning lines, reasonable arrangement of steel bar supports is ensured, steel bar approach is carried out, steel bar material proof and timely recheck are carried out, the technical sampling test work of welding test pieces is carried out in advance according to the specification requirements, the material preparation needs to check each frequent material, and material qualification proof and delivery quality assurance certificate are required;
s2: preparing a construction machine: the device comprises a steel bar cutting machine, a grinding wheel cutting machine, a steel bar bending machine, a steel bar straightening machine, a steel bar numerical control forming machine, a steel bar numerical control bending machine, a metal section bar cutting machine, an electric welding machine, a total station and a leveling instrument;
s3: and (3) excavation: after the foundation slab and the bearing platform earthwork are excavated, a C20 concrete cushion layer with the thickness of 200 percent is poured in time, a bearing platform brick moulding bed is built, the earth side of the pit bottom is not disturbed, after the brick moulding bed and the pile foundation are detected, binding of reinforcing steel bars at the bottom of the base slab is carried out according to the drawing requirements, the reinforcing steel bars at the bottom of the base slab are pushed to ramp openings from the periphery as a whole according to the flowing water construction principle, and the reinforcing steel bar binding of a deep foundation pit is synchronously carried out;
s4: positioning an upright post: firstly, accurately positioning a support upright post according to a deepening drawing, and marking positioning on a bottom steel bar by using red paint;
s5: welding a stand column seat cushion: welding a column seat made of 8# channel steel to a bottom reinforcing steel bar on a channel steel column positioning point in the super-thick raft area of the core tube;
s6: welding stand columns: according to different thicknesses, the core tube super-thick raft area takes 8# channel steel with different calculated lengths as a support upright post, the bottom of the core tube super-thick raft area is welded and fixed with the 8# channel steel seat cushion, and the upright post is temporarily and obliquely fixed by steel bars or angle steel;
s7: welding an intermediate structural layer: l50x5 angle steel is used as a longitudinal and transverse horizontal support, an intermediate structural layer of the bracket is welded, a wood scaffold board is required to be placed on a next structural layer when the upper layer horizontal support is welded, and a simple horizontal support welding operation table is built;
s8: welding of gluten brackets: and (3) the upper node of the support is welded and fixed with the upright column by using L50x5 angle steel, then the upper 8# channel steel beam is welded, the main stress beam 8# channel steel is required to be perpendicular to the arrangement direction of the reinforcing steel bars at the bottommost row, the binding operation of the bottom plate reinforcing steel bars is carried out on the support body after the whole welding of the support body is finished, the safety of the reinforcing steel bar support frame is considered, the temporary concentrated stacking of the reinforcing steel bars is strictly forbidden on the upper part of the support frame, and when the concrete horizontal pump pipe is arranged on the upper part of the bottom plate reinforcing steel bar, an upright column is additionally arranged between the two upright columns of the reinforcing steel bar support frame in the range below the pump pipe for reinforcement.
2. The method for constructing the steel bar support of the large-volume concrete bottom plate according to claim 1, which is characterized by comprising the following steps: the supporting steel bar entering the site simultaneously must have a material qualification certificate and a delivery quality assurance certificate, a constructor, a quality person, a steel bar responsibility engineer and a supervision check together to check the specification, the model, the performance, the quantity and the identification of the steel bar, check whether the appearance quality and the transportation process are damaged, check the product qualification certificate and the delivery inspection report, once the steel bar with obvious appearance defects or unsatisfactory requirements is found, the personnel should be immediately reported to process according to the unqualified products, project material person makes relevant records, when the steel bar leaves the site, no less than two labels are hung on each bundle, marks such as the factory marks, the steel numbers, the furnace numbers and the diameters are printed, no label bundles of the steel bar cannot be received and used, the steel bar enters the construction site to be accepted in batches, when the steel bar is found to be brittle, the welding performance is poor or the mechanical performance is obviously abnormal in the processing process of the steel bar, the steel bar must be immediately stopped to be used, the steel bar can be continuously used after the inspection, the surface is not provided with obvious appearance defects or the steel bar which is required to be in the unsatisfactory, the project material quality is required to be processed according to the unqualified products, the quality test is repeated, the quality of the test is required to be the quality of the steel bar is required to be directly qualified in the quality test, and the quality of the test is not to be the qualified test is the qualified for the quality of the steel bar, and the quality is not required to be the qualified in the qualified test is the qualified test of the quality.
3. The method for constructing the steel bar support of the large-volume concrete bottom plate according to claim 1, which is characterized by comprising the following steps: at least 3 tower cranes are required to be arranged on the construction site, the hoisting radius covers the whole construction area and peripheral material yards, the horizontal transportation requirement of materials is met, and meanwhile, corresponding numbers of steel bar binding workers, welding workers and profile steel processing workers are required to be prepared.
4. The method for constructing the steel bar support of the large-volume concrete bottom plate according to claim 1, which is characterized by comprising the following steps: during excavation, as more water pits and elevator foundation pits exist on the foundation slab, the positions of column foot supports are required to be considered for the column and cross rod positioning of the support frame, and positioning deepening treatment is required to be carried out on the support column of the core tube ultra-thick base slab.
5. The method for constructing the steel bar support of the large-volume concrete bottom plate according to claim 1, which is characterized by comprising the following steps: the upper node of the core tube ultra-thick bottom plate steel bar support is provided with a main stress beam 8# channel steel which is required to be perpendicular to the arrangement direction of the bottom row of the gluten, the specific elevation of the bottom row of the gluten is determined by the work length of the site steel bars, and the theoretical elevation of the top of the main stress beam = the elevation of the bottom plate surface-the thickness of the protective layer-the thickness of the gluten.
6. The method for constructing the steel bar support of the large-volume concrete bottom plate according to claim 1, which is characterized by comprising the following steps: the stand column positioning of the support is accurately fixed by measurement, and attention needs to be paid to the fact that a site dewatering well possibly collides with the stand column positioning point, so that the stand column positioning can be flexibly adjusted on site according to conditions.
7. The method for constructing the steel bar support of the large-volume concrete bottom plate according to claim 1, which is characterized by comprising the following steps: the welding requirements of the support channel steel and the angle steel are four-side girth welding, the welding is full, the welding seam height is 6mm, and the width is more than or equal to 8mm.
8. The method for constructing the steel bar support of the large-volume concrete bottom plate according to claim 1, which is characterized by comprising the following steps: because the stand passes through the base and places on the bottom plate reinforcing bar, and bottom plate reinforcing bar height is different, consequently, in order to guarantee pole setting length, when carrying out the pole setting unloading, length can be longer than calculation theoretical length slightly, after the support welding is accomplished, by measuring unified elastic wire leveling, the higher part channel-section steel cuts off, ensures the level of support upper portion.
9. The method for constructing the steel bar support of the large-volume concrete bottom plate according to claim 1, which is characterized by comprising the following steps: when the bottom plate is bound, the problems of foundation form and on-site elevation change of the bottom plate, steel bar lofting and processing difficulty are required to be paid attention to, so that the binding quality is required to be ensured.
10. The method for constructing the steel bar support of the large-volume concrete bottom plate according to claim 1, which is characterized by comprising the following steps: the processing heights of the steel bar supports and the split heads are calculated accurately according to the specifications of the upper and lower rows of steel bars and the thickness of the protective layer according to the difference of the heights of the bottom plates, and the processing heights of the supporting frames used in different positions are respectively identified and are convenient to take.
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| CN114370188A (en) * | 2022-03-01 | 2022-04-19 | 安徽省工业设备安装有限公司 | Construction method for public pipe gallery of industrial plant area in severe cold region |
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