CN116044204A - Method for reinforcing concrete floor slab with seriously rusted steel bar - Google Patents
Method for reinforcing concrete floor slab with seriously rusted steel bar Download PDFInfo
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- CN116044204A CN116044204A CN202310130146.7A CN202310130146A CN116044204A CN 116044204 A CN116044204 A CN 116044204A CN 202310130146 A CN202310130146 A CN 202310130146A CN 116044204 A CN116044204 A CN 116044204A
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- 230000003014 reinforcing effect Effects 0.000 title claims abstract description 157
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 106
- 239000010959 steel Substances 0.000 title claims abstract description 105
- 238000000034 method Methods 0.000 title claims abstract description 47
- 239000004567 concrete Substances 0.000 title claims abstract description 29
- 239000000463 material Substances 0.000 claims abstract description 86
- 230000007246 mechanism Effects 0.000 claims abstract description 34
- 239000010410 layer Substances 0.000 claims abstract description 25
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims abstract description 24
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims abstract description 23
- 230000008569 process Effects 0.000 claims abstract description 18
- 239000003112 inhibitor Substances 0.000 claims abstract description 6
- 239000011241 protective layer Substances 0.000 claims abstract description 5
- 238000012544 monitoring process Methods 0.000 claims abstract description 3
- 230000001680 brushing effect Effects 0.000 claims abstract 2
- 230000007797 corrosion Effects 0.000 claims description 15
- 238000005260 corrosion Methods 0.000 claims description 15
- 230000008859 change Effects 0.000 claims description 4
- 238000004873 anchoring Methods 0.000 claims description 3
- 239000011150 reinforced concrete Substances 0.000 abstract description 19
- 238000010276 construction Methods 0.000 abstract description 11
- 238000005034 decoration Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 5
- 238000006073 displacement reaction Methods 0.000 abstract 1
- 230000007613 environmental effect Effects 0.000 abstract 1
- 230000002787 reinforcement Effects 0.000 description 8
- 238000005336 cracking Methods 0.000 description 6
- 230000006872 improvement Effects 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 3
- 230000001788 irregular Effects 0.000 description 3
- 229920000049 Carbon (fiber) Polymers 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 230000000740 bleeding effect Effects 0.000 description 2
- 239000004917 carbon fiber Substances 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 238000009415 formwork Methods 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- 239000011449 brick Substances 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
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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
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
- E04G23/0237—Increasing or restoring the load-bearing capacity of building construction elements of storey floors
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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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- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
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- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Working Measures On Existing Buildindgs (AREA)
Abstract
The method for reinforcing the concrete floor slab with the seriously rusted steel bars comprises the steps of unloading a plate to be reinforced; chiseling a plastering layer and a protective layer at the bottom of a plate to be reinforced, removing a rust layer of steel bars in the plate, and brushing a rust inhibitor; a newly added floor slab reinforcing steel bar is implanted on the beam; the bottom of the template is provided with a valve hole, and a pouring valve is arranged; a template is supported, and a vertical supporting mechanism comprising a lifting threaded rod is arranged at the lower part of the template; arranging an infrared measuring ruler, and monitoring displacement deformation of the bottom of the template; the grouting material pipe is connected with a pressurizing pump through a valve, the valve is closed after grouting material is poured to the designed thickness, and the grouting material pipe is taken down; after the grouting material is initially set, the template is synchronously and integrally moved upwards by adjusting the screw rod; maintaining grouting material until the design age, and removing the vertical supporting mechanism; and (5) flattening the grouting material from the grouting valve to the bottom of the plate. The reinforcing method does not need to remove the decoration layer on the upper part of the floor slab, has the advantages of short operation period, quick effect, simple construction process, small influence on the original reinforced concrete slab, environmental protection, economy and applicability.
Description
Technical Field
The invention belongs to the technical field of building reinforcement, and particularly relates to a method for reinforcing a concrete floor slab with seriously rusted steel bars.
Background
For the purpose of reconstruction or for the reason that the building structure has reached the design life, it is often necessary to reinforce the building structure. In various projects of structural reinforcement, reinforced concrete floors often have cracking of the concrete at the bottom of the slab and rust of the steel bars due to long service life, corrosive ions contained in the concrete material, irregular construction method or unreasonable structural design. The corrosion of the floor steel bars also can lead to the decrease of the bonding strength between the steel bars and the floor, so that the tensile strength of the steel bars cannot be effectively transferred to the floor. The large-volume corrosion products generated by the corrosion of the steel bars can be accumulated in the floor slab concrete and the steel bars, so that the extrusion stress of the concrete is gradually increased to accelerate the cracking of the floor slab, and the normal use of the floor slab can be gradually influenced. The corrosion of the reinforced concrete slab may cause the durability and the bearing capacity of the reinforced concrete slab to be reduced, thereby causing damage to the reinforced concrete slab. Therefore, the floor bottom reinforcement and the plate bottom reinforcement treatment are the problems to be solved.
The prior reinforcing method of the reinforced concrete floor slab mainly comprises a reinforcing method for increasing the section, a reinforcing method for pasting carbon fibers or steel plates, a reinforcing method for additionally arranging steel beam supports at the bottom of the slab, and a floor slab supporting method. However, the method for reinforcing the enlarged section is required to change the arrangement of the upper part of the original floor or carry out perforating operation on the floor, and the method for reinforcing the glued carbon fiber or the steel plate is not suitable to be used under the condition that the original floor is longer in service time or deeper in carbonization depth, and the conditions that the floor surface of the floor is cracked can occur due to the additionally arranged steel beam supporting and reinforcing method and the additionally arranged floor supporting method. The common reinforcing method for increasing the thickness of the floor slab at the upper part of the floor needs to dismantle the original floor bricks, needs to be decorated again, has long construction period, further can influence normal use and increases economic investment. Therefore, there is a need for a reinforced concrete slab reinforcement method with short working period, quick effect, simple construction process and wide application range, which is used for treating the concrete cracking phenomenon caused by the factors of expiration of the design service life, limited material characteristics, nonstandard construction method, unreasonable structural design and the like, and the damage caused by the reduction of the durability and bearing capacity of the slab due to corrosion of the concrete steel bars at the bottom of the slab, so as to realize simple, efficient, environment-friendly and economic reinforcement.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention provides a method for reinforcing the concrete floor slab with severely rusted steel bars, which does not need to dismantle the concrete floor slab with rusted steel bars, does not need to dismantle a decoration layer on the upper part of the floor slab, does not need to consider the bearing capacity of the concrete floor slab with rusted steel bars, has the advantages of short operation period, quick effect and simple construction process, can effectively solve the problems of cracking of the bottom of the reinforced concrete floor slab and rusted steel bars, enhances the durability and bearing capacity of the reinforced concrete floor slab, saves decoration cost, and can realize the simple, efficient, environment-friendly and economic repair of the concrete floor slab with rusted steel bars.
In order to achieve the above purpose, the invention provides a method for reinforcing a concrete floor slab with severely rusted steel bars, which comprises the following steps;
step one: unloading the plate to be reinforced;
the load above the plate to be reinforced is removed completely, so that the bearing of the stress of the plate to be reinforced is reduced;
step two: chiseling a plastering layer and a protective layer at the bottom of the plate to be reinforced, and carrying out rust removal treatment on the steel bars of the plate to be reinforced;
s21: dividing a plate to be reinforced into a plurality of sections along the length direction, and supporting a group of vertical steel pipes below each section, wherein the top ends of the vertical steel pipes are abutted with the lower end surface of the plate to be reinforced through an upper base plate, so that the lower ends of the vertical steel pipes are abutted with a floor slab below the plate to be reinforced through a lower base plate;
s22: starting chiseling a plurality of sections one by one from one end;
firstly removing a group of vertical steel pipes in an operation section, then chiseling a plastering layer and a protective layer at the bottom of a plate to be reinforced in the section by using tools to expose the steel bars of the plate to be reinforced at the bottom of the plate to be reinforced in the section, then chiseling the next operation section according to the method until all the sections are processed, and ensuring that the steel bars of the plate to be reinforced at the lower part of the plate to be reinforced are exposed;
s23: derusting the exposed plate steel bars to be reinforced;
the exposed steel bars of the plate to be reinforced are subjected to rust removal treatment according to the rust condition, the steel bars of the plate to be reinforced with serious rust are removed, the steel bars of the plate to be reinforced with the same specification are replaced by new steel bars, the steel bars are fixedly connected with the original steel bar meshes, and the steel bars of the plate to be reinforced with lighter rust are removed and coated with a rust inhibitor;
step three: binding reinforcing plate steel bars;
binding reinforcing plate steel bars of a newly added floor slab below the bottom of the plate to be reinforced, connecting the reinforcing plate steel bars with the exposed reinforcing plate steel bars, and anchoring the end parts of the reinforcing plate steel bars into the beams at the plate ends so as to enhance the bearing capacity of the plate to be reinforced by using the reinforcing plate steel bars;
step four: a hole is formed in the bottom of the reinforcing plate template, and a grouting material pouring valve is arranged;
firstly, a tool is used for forming a hole on the reinforcing plate template according to the size of a grouting material pouring valve, and then the grouting material pouring valve is installed on the hole;
step five: supporting a reinforcing plate template and installing a vertical supporting mechanism;
s51: installing a reinforcing plate template below the bound reinforcing plate steel bars, and enabling the reinforcing plate template to be positioned 20-25 mm below the designed height;
s52: a plurality of vertical supporting mechanisms are supported below the reinforcing plate template, each vertical supporting mechanism consists of a first base plate, a liftable screw, a connecting piece, a steel strut and a second base plate, wherein the first base plate, the liftable screw, the connecting piece, the steel strut and the second base plate are sequentially distributed from top to bottom, the lower end of the steel strut is abutted with a floor slab below the plate to be reinforced through the second base plate, the upper end of the steel strut is fixedly connected with the lower end of the liftable screw through the connecting piece, and the upper end of the liftable screw is abutted with the lower end face of the reinforcing plate template through the first base plate;
step six: arranging an infrared measuring ruler, and monitoring the height of the reinforcing plate template;
taking a central point at the bottom of the reinforcing plate template and a middle point at the root of four sides of the reinforcing plate template as measuring points, and fixedly arranging an infrared measuring ruler under each measuring point so as to record the height data of the bottom of the reinforcing plate template by using the infrared measuring ruler;
step seven: pouring grouting material through a grouting material pouring valve;
s71: establishing connection between a grouting material pouring valve and a pressurizing pump by using a grouting material pipe;
s72: firstly, closing a grouting material pouring valve, and then adding grouting material into a pressurizing pump;
s73: opening a grouting material pouring valve, starting a pressurizing pump, pouring grouting material above the reinforcing plate template until the poured grouting material reaches the designed thickness, closing the grouting material pouring valve, and taking down the grouting material pipe;
step eight: enabling the reinforcing plate template to synchronously and integrally move upwards;
when the grouting material poured in the seventh step reaches the initial setting time, synchronously adjusting a lifting screw rod at the upper part of the steel support column to enable the whole reinforcing plate template to synchronously and upwards jack 1-3 mm, wherein the jacking process is divided into a plurality of times, the jacking distance of the reinforcing plate template is the same each time, the jacking distance is controlled by comparing the numerical value of an infrared measuring ruler, and the whole reinforcing plate template is ensured to be horizontal in the jacking process;
step nine: removing the vertical supporting mechanism and detecting the strength;
removing the vertical supporting mechanism after curing the grouting material poured in the step seven to the design age, comparing and observing the numerical value of the infrared measuring ruler before and after removing, recovering the vertical supporting mechanism if the numerical value has excessive change, removing the vertical supporting mechanism after deformation tends to be stable, removing the reinforcing plate template after removing the vertical supporting mechanism, detecting the strength of the newly poured reinforcing plate, reworking the step seven if the strength does not meet the requirement, and carrying out the step ten if the strength meets the requirement;
step ten: treating grouting materials at the bottom of the plate;
and (3) removing the grouting material from the grouting material valve to the bottom of the reinforcing plate template plate, and ensuring the flatness of the bottom of the reinforcing plate template plate.
In the fourth step, the number of the vertical supporting mechanisms is set according to the load and deformation calculation result.
Further, in order to make the structure of liftable screw rod simpler, simultaneously, in order to make its bearing capacity more reliable and more stable, in step five, liftable screw rod comprises the support sleeve that is located the lower part and the support body of rod that is located upper portion, the internal thread hole has been seted up to support telescopic upper portion axle center department, has seted up external screw thread structure on the shaft of support body of rod, and the lower part of support body of rod passes through screw-thread fit connection in support telescopic internal thread hole, the outside fixedly connected with regulating block of upper end of support body of rod, the cross section of regulating block is regular polygon.
Preferably, in step one, it is ensured that the finishing layer of the upper part of the floor to be reinforced is not damaged during the unloading process.
Further, in order to improve the chipping efficiency, the chipping operation in step ten is performed using a cutter.
According to the invention, the load above the plate to be reinforced is removed before the chiseling operation, so that the plate to be reinforced with reduced bearing capacity due to the action of the load in the chiseling operation process can be prevented from being damaged; in the chiseling operation process, the bottom plastering layer and the protection layer of the plate to be reinforced are chiseled in sections, and meanwhile, the chiseling operation can be effectively reduced by adopting a mode of chiseling while supporting and unloading, so that the damage to the upper structure of the plate to be reinforced can be greatly reduced. When handling the reinforcing plate reinforcing bar that exposes outside, replace the serious reinforcing bar of corrosion, not only can effectively increase original steel bar structure's bearing capacity, can also effectively improve original steel bar structure and concrete grouting's binding capacity, remove and brush the rust inhibitor to the corrosion layer on the lighter reinforcing bar surface of corrosion, not only can avoid the follow-up circumstances that takes place to rust once more, also can be favorable to improving its and follow-up concrete grouting's binding capacity, like this, through the holistic joint strength of reinforcing back floor of improvement that rust cleaning is handled, make the tensile strength of reinforcing bar can effectually transmit for the floor, and then can the bearing capacity of reinforcing back floor of improvement by a wide margin. Holes are formed in the reinforcing plate templates, and the grouting material pouring valve is connected with the pressurizing pump by using the grouting material pipes, so that the subsequent grouting material pouring process is more convenient. The reinforcing plate template is supported below the bound reinforcing plate steel bars, and the height of the reinforcing plate template is 20-25 mm lower than the design height of the reinforcing plate template, so that more grouting materials can be poured into the reinforcing plate template, and the bound reinforcing plate steel bars, exposed reinforcing plate steel bars to be reinforced and concrete at the lower part of the reinforcing plate can be fully connected by using the grouting materials, so that the integral bonding strength of the reinforced floor slab is effectively improved. The rigid supporting part of the vertical supporting mechanism consists of a liftable threaded rod and a steel strut, so that the bearing strength can be ensured, and the vertical supporting mechanism can have liftable capacity. When the poured grouting material reaches the initial setting time, the whole reinforcing plate template is synchronously jacked upwards by 1-3 mm, so that gaps caused by top floating paste and bleeding can be relieved, the grouting material is more solidified, binding reinforcing plate reinforcing steel bars, exposed reinforcing plate reinforcing steel bars to be reinforced and concrete at the lower part of the reinforcing plate can be effectively promoted to be combined into a whole, and the bearing capacity of the reinforced floor slab can be remarkably improved. The strength detection is carried out after the grouting material is cured to the design age, and the reliability of the reinforced floor slab can be ensured by a more scientific means. The reinforcing method does not need to dismantle the decoration layer on the upper part of the floor slab, has the advantages of short whole operation period, simple construction process, good reinforcing effect, quick effect, small influence on the upper structure of the original reinforced concrete slab, wider application range and no need to consider the bearing capacity of the original reinforced concrete slab, effectively solves the problems of cracking, collapsing, overlarge deformation or insufficient bearing capacity of the reinforced concrete slab caused by factors such as expiration of the design service life, limited material characteristics, irregular construction method, unreasonable structural design and the like, and realizes the simple, efficient, economic and safe repairing and reinforcing treatment of the reinforced concrete slab.
Drawings
FIG. 1 is a bottom plan view of an original reinforced concrete slab reinforced front panel of the present invention;
FIG. 2 is a cross-sectional view taken along the direction A-A in FIG. 1;
FIG. 3 is a plan view of the bottom of the original reinforced concrete slab reinforced in the present invention;
FIG. 4 is a cross-sectional view taken along the direction B-B in FIG. 3;
FIG. 5 is a schematic view of the structure of the vertical steel pipes supported below the plate to be reinforced;
FIG. 6 is a schematic view of the structure of reinforcement bar binding and reinforcement formwork support in accordance with the present invention;
FIG. 7 is a schematic view of a structure of the vertical supporting mechanism supported below the plate to be reinforced;
FIG. 8 is a schematic illustration of a grouting material casting process according to the present invention;
FIG. 9 is a schematic view of the front face of the grouting valve of the present invention;
FIG. 10 is a schematic diagram of the construction of the side of the grout valve of the present invention;
FIG. 11 is a schematic view of the support state of the reinforcing plate template before jacking in the present invention;
FIG. 12 is a schematic view of the support state of the reinforcing plate formwork of the present invention after jacking;
fig. 13 is a schematic view of the structure of the liftable screw in the present invention.
In the figure: 1. the steel plate comprises a plate to be reinforced, 2, a plate reinforcing steel bar to be reinforced, 3, a reinforcing plate reinforcing steel bar, 4, a reinforcing plate template, 5, a beam at the plate end, 6, a grouting material pouring valve, 7, a steel strut, 8, a liftable screw, 9, a connecting piece, 10, a first base plate, 11, an infrared measuring ruler, 12, a grouting material pipe, 13, a booster pump, 14, a reinforcing plate, 15, a second base plate, 16, a supporting sleeve, 17, a supporting rod body, 18, an adjusting block, 19, a vertical steel pipe, 20, an upper base plate, 21 and a lower base plate.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1 to 13, the present invention provides a method for reinforcing a concrete floor slab in which a reinforcing bar is severely rusted, comprising the steps of;
step one: unloading the plate 1 to be reinforced;
removing all the loads (such as various furniture, equipment and the like) above the plate 1 to be reinforced so as to reduce the bearing of the stress of the plate 1 to be reinforced; during unloading, it is ensured that the finishing layer on the upper part of the floor slab 1 to be reinforced is not destroyed.
Step two: chiseling a bottom plastering layer and a protective layer of the plate to be reinforced 1, and carrying out rust removal treatment on the reinforcing steel bars 2 of the plate to be reinforced;
s21: dividing the plate 1 to be reinforced into a plurality of sections along the length direction, and supporting a group of vertical steel pipes 19 below each section, wherein the top ends of the vertical steel pipes 19 are abutted with the lower end surface of the plate 1 to be reinforced through upper base plates 20, so that the lower ends of the vertical steel pipes 19 are abutted with a floor slab below the plate 1 to be reinforced through lower base plates 21;
preferably, the upper pad 20 and the lower pad 21 are wood pads;
s22: starting chiseling a plurality of sections one by one from one end;
firstly, removing a group of vertical steel pipes 19 in an operation section, then chiseling a plastering layer and a protection layer at the bottom of a plate 1 to be reinforced in the section by using tools to expose the steel bars 2 to be reinforced at the bottom of the plate 1 to be reinforced in the section, then chiseling the next operation section according to the method until all the sections are processed, and ensuring that the steel bars 2 to be reinforced at the lower part of the plate 1 to be reinforced are all exposed;
s23: derusting the exposed reinforcing steel bars 2 of the plate to be reinforced;
the exposed reinforcing steel bars 2 of the plate to be reinforced are subjected to rust removal treatment according to the rust condition, the reinforcing steel bars 2 of the plate to be reinforced with serious rust are removed, the reinforcing steel bars are replaced by new reinforcing steel bars with the same specification and are fixedly connected with the original reinforcing steel bar net, and the rust layer on the surface of the reinforcing steel bars 2 of the plate to be reinforced with lighter rust is removed and coated with a rust inhibitor;
step three: binding reinforcing plate steel bars 3;
binding reinforcing plate steel bars 3 of a newly added floor slab under the bottom of the plate 1 to be reinforced, connecting the reinforcing plate steel bars 3 with the reinforcing plate steel bars 2 exposed outside, and anchoring the end parts of the reinforcing plate steel bars 3 into the beams 5 at the plate ends so as to enhance the bearing capacity of the plate 1 to be reinforced by using the reinforcing plate steel bars 3;
step four: the bottom of the reinforcing plate template 4 is provided with a hole, and a grouting material pouring valve 6 is arranged;
firstly, a tool is used for forming holes on the reinforcing plate template 4 according to the size of the grouting material pouring valve 6, and then the grouting material pouring valve 6 is installed on the hole;
as one preference, the number of vertical support mechanisms is set according to the load and deformation calculation results.
Step five: supporting a reinforcing plate template 4 and installing a vertical supporting mechanism;
s51: installing a reinforcing plate template 4 below the bound reinforcing plate steel bars 3, and enabling the reinforcing plate template 4 to be positioned 20-25 mm below the designed height;
s52: a plurality of vertical supporting mechanisms are supported below the reinforcing plate template 4, each vertical supporting mechanism consists of a first base plate 10, a liftable screw rod 8, a connecting piece 9, a steel support column 7 and a second base plate 15 which are sequentially distributed from top to bottom, wherein the lower end of the steel support column 7 is abutted with a floor slab below the reinforcing plate 1 through the second base plate 15, the upper end of the steel support column 7 is fixedly connected with the lower end of the liftable screw rod 8 through the connecting piece 9, and the upper end of the liftable screw rod 8 is abutted with the lower end face of the reinforcing plate template 4 through the first base plate 10;
preferably, the lower part of the connecting piece 9 is provided with a threaded hole, the outer part of the upper end of the steel support column 7 is provided with external threads, and the connecting piece 9 is fixedly sleeved outside the upper end of the steel support column 7 through threaded fit.
In order to make the structure of liftable screw rod simpler, simultaneously, in order to make its bearing capacity more reliable and stable, liftable screw rod 8 comprises the support sleeve 16 that is located the lower part and the support body of rod 17 that is located the upper portion, the internal thread hole has been seted up to the upper portion axle center department of support sleeve 16, has seted up external screw thread structure on the shaft of support body of rod 17, and the lower part of support body of rod 17 passes through screw-thread fit connection in the internal thread hole of support sleeve 16, the outside fixedly connected with regulating block 18 of upper end of support body of rod 17, the cross section of regulating block 18 is regular polygon. Preferably, the outer section of the connecting piece 9 is regular polygon, so that when the height of the liftable screw 8 needs to be adjusted, one wrench can be used to fix the connecting piece 9, and the other wrench can be used to rotate the adjusting block 18, so that the height of the liftable screw 8 can be conveniently adjusted.
Preferably, the connecting piece 9, the first pad plate 10 and the second pad plate 15 are all wood pad plates;
step six: an infrared measuring ruler 11 is arranged to monitor the height of the reinforcing plate template 4;
taking a central point at the bottom of the reinforcing plate template 4 and a middle point at the root of four sides of the reinforcing plate template 4 as measuring points, and fixedly arranging an infrared measuring ruler 11 under each measuring point so as to record the height data of the bottom of the reinforcing plate template 4 by utilizing the infrared measuring ruler 11;
step seven: pouring grouting material through a grouting material pouring valve 6;
s71: the connection between the grouting material pouring valve 6 and the pressurizing pump 13 is established by using the grouting material pipe 12;
s72: firstly, closing a grouting material pouring valve 6, and then adding grouting material into a pressurizing pump 13;
s73: opening a grouting material pouring valve 6, starting a pressurizing pump 13, pouring grouting material above the reinforcing plate template 4 until the poured grouting material reaches the designed thickness, closing the grouting material pouring valve 6, and taking down a grouting material pipe 12; as a preference, the booster pump 13 is removed from the floor below the panel 1 to be reinforced;
step eight: synchronously and integrally moving the reinforcing plate template 4 upwards;
when the grouting material poured in the step seven reaches the initial setting time, synchronously adjusting the lifting screw rods 8 at the upper parts of the steel struts 7, so that the whole reinforcing plate template 4 is synchronously lifted upwards by 1-3 mm, the lifting process is divided into a plurality of times, the lifting distance of the reinforcing plate template 4 is the same each time, the lifting distance is controlled by comparing the numerical value of the infrared measuring ruler 11, and the whole reinforcing plate template 4 is ensured to be horizontal in the lifting process;
step nine: removing the vertical supporting mechanism and detecting the strength;
removing the vertical supporting mechanism after curing the grouting material poured in the step seven to the design age, comparing and observing the numerical value of the infrared measuring ruler 11 before and after removing, recovering the vertical supporting mechanism if the numerical value has excessive change, removing the vertical supporting mechanism after deformation tends to be stable, removing the reinforcing plate template 4 after removing the vertical supporting mechanism, detecting the strength of the newly poured reinforcing plate 14, reworking the step seven if the strength does not meet the requirement, and carrying out the step ten if the strength meets the requirement;
step ten: treating grouting materials at the bottom of the plate;
and removing grouting materials from the grouting material valve 6 to the bottom of the reinforcing plate template 4, and ensuring the flatness of the bottom of the reinforcing plate template 4.
Preferably, the cutting operation is performed by a cutter during the cutting operation in order to improve the cutting efficiency.
According to the invention, the load above the plate to be reinforced is removed before the chiseling operation, so that the plate to be reinforced with reduced bearing capacity due to the action of the load in the chiseling operation process can be prevented from being damaged; in the chiseling operation process, the bottom plastering layer and the protection layer of the plate to be reinforced are chiseled in sections, and meanwhile, the chiseling operation can be effectively reduced by adopting a mode of chiseling while supporting and unloading, so that the damage to the upper structure of the plate to be reinforced can be greatly reduced. When handling the reinforcing plate reinforcing bar that exposes outside, replace the serious reinforcing bar of corrosion, not only can effectively increase original steel bar structure's bearing capacity, can also effectively improve original steel bar structure and concrete grouting's binding capacity, remove and brush the rust inhibitor to the corrosion layer on the lighter reinforcing bar surface of corrosion, not only can avoid the follow-up circumstances that takes place to rust once more, also can be favorable to improving its and follow-up concrete grouting's binding capacity, like this, through the holistic joint strength of reinforcing back floor of improvement that rust cleaning is handled, make the tensile strength of reinforcing bar can effectually transmit for the floor, and then can the bearing capacity of reinforcing back floor of improvement by a wide margin. Holes are formed in the reinforcing plate templates, and the grouting material pouring valve is connected with the pressurizing pump by using the grouting material pipes, so that the subsequent grouting material pouring process is more convenient. The reinforcing plate template is supported below the bound reinforcing plate steel bars, and the height of the reinforcing plate template is 20-25 mm lower than the design height of the reinforcing plate template, so that more grouting materials can be poured into the reinforcing plate template, and the bound reinforcing plate steel bars, exposed reinforcing plate steel bars to be reinforced and concrete at the lower part of the reinforcing plate can be fully connected by using the grouting materials, so that the integral bonding strength of the reinforced floor slab is effectively improved. The rigid supporting part of the vertical supporting mechanism consists of a liftable threaded rod and a steel strut, so that the bearing strength can be ensured, and the vertical supporting mechanism can have liftable capacity. When the poured grouting material reaches the initial setting time, the whole reinforcing plate template is synchronously jacked upwards by 1-3 mm, so that gaps caused by top floating paste and bleeding can be relieved, the grouting material is more solidified, binding reinforcing plate reinforcing steel bars, exposed reinforcing plate reinforcing steel bars to be reinforced and concrete at the lower part of the reinforcing plate can be effectively promoted to be combined into a whole, and the bearing capacity of the reinforced floor slab can be remarkably improved. The strength detection is carried out after the grouting material is cured to the design age, and the reliability of the reinforced floor slab can be ensured by a more scientific means. The reinforcing method does not need to dismantle the decoration layer on the upper part of the floor slab, has the advantages of short whole operation period, simple construction process, good reinforcing effect, quick effect, small influence on the upper structure of the original reinforced concrete slab, wider application range and no need to consider the bearing capacity of the original reinforced concrete slab, effectively solves the problems of cracking, collapsing, overlarge deformation or insufficient bearing capacity of the reinforced concrete slab caused by factors such as expiration of the design service life, limited material characteristics, irregular construction method, unreasonable structural design and the like, and realizes the simple, efficient, economic and safe repairing and reinforcing treatment of the reinforced concrete slab.
Claims (5)
1. A method for reinforcing a concrete floor slab with seriously rusted steel bars is characterized by comprising the following steps of;
step one: unloading the plate (1) to be reinforced;
the load above the plate (1) to be reinforced is removed completely, so that the bearing of the stress of the plate (1) to be reinforced is reduced;
step two: chiseling a bottom plastering layer and a protective layer of the plate (1) to be reinforced, and carrying out rust removal treatment on the steel bars (2) of the plate to be reinforced;
s21: dividing the plate (1) to be reinforced into a plurality of sections along the length direction, and supporting a group of vertical steel pipes (19) below each section, wherein the top ends of the vertical steel pipes (19) are abutted with the lower end surface of the plate (1) to be reinforced through upper base plates (20), so that the lower ends of the vertical steel pipes (19) are abutted with a floor slab below the plate (1) to be reinforced through lower base plates (21);
s22: starting chiseling a plurality of sections one by one from one end;
firstly removing a group of vertical steel pipes (19) of an operation section, then chiseling a plastering layer and a protection layer at the bottom of a plate (1) to be reinforced in the section by using tools to expose the steel bars (2) of the plate to be reinforced at the bottom of the plate (1) to be reinforced in the section, then chiseling the next operation section according to the method until all the sections are processed, and ensuring that the steel bars (2) of the plate to be reinforced at the lower part of the plate (1) to be reinforced are all exposed;
s23: derusting the exposed reinforcing steel bars (2) of the plate to be reinforced;
derusting the exposed reinforcing steel bars (2) of the plate to be reinforced according to the corrosion condition, removing the reinforcing steel bars (2) of the plate to be reinforced with serious corrosion, replacing the reinforcing steel bars with new reinforcing steel bars with the same specification, fixedly connecting the reinforcing steel bars with an original reinforcing steel bar net, removing a corrosion layer on the surface of the reinforcing steel bars (2) of the plate to be reinforced with lighter corrosion, and brushing a rust inhibitor;
step three: binding reinforcing plate steel bars (3);
binding reinforcing plate steel bars (3) of a newly added floor slab under the bottom of the plate (1) to be reinforced, connecting the reinforcing plate steel bars (3) with the reinforcing plate steel bars (2) exposed outside, and anchoring the end parts of the reinforcing plate steel bars (3) into the beams (5) at the plate ends so as to enhance the bearing capacity of the plate (1) to be reinforced by using the reinforcing plate steel bars (3);
step four: a hole is formed at the bottom of the reinforcing plate template (4), and a grouting material pouring valve (6) is arranged;
firstly, a tool is used for forming a hole on the reinforcing plate template (4) according to the size of a grouting material pouring valve (6), and then the grouting material pouring valve (6) is installed on the hole;
step five: supporting a reinforcing plate template (4) and installing a vertical supporting mechanism;
s51: installing a reinforcing plate template (4) below the bound reinforcing plate steel bars (3), and enabling the reinforcing plate template (4) to be positioned 20-25 mm below the designed height;
s52: a plurality of vertical supporting mechanisms are supported below the reinforcing plate templates (4), each vertical supporting mechanism consists of a first base plate (10), a lifting screw (8), a connecting piece (9), a steel support column (7) and a second base plate (15) which are distributed in sequence from top to bottom, wherein the lower end of the steel support column (7) is abutted with a floor slab below the reinforcing plate (1) to be reinforced through the second base plate (15), the upper end of the steel support column (7) is fixedly connected with the lower end of the lifting screw (8) through the connecting piece (9), and the upper end of the lifting screw (8) is abutted with the lower end face of the reinforcing plate templates (4) through the first base plate (10);
step six: arranging an infrared measuring ruler (11) and monitoring the height of the reinforcing plate template (4);
taking a central point at the bottom of the reinforcing plate template (4) and a middle point at the root of four sides of the reinforcing plate template (4) as measuring points, and fixedly arranging an infrared measuring ruler (11) under each measuring point so as to record the height data of the bottom of the reinforcing plate template (4) by using the infrared measuring ruler (11);
step seven: pouring grouting material through a grouting material pouring valve (6);
s71: the grouting material pipe (12) is utilized to establish the connection between the grouting material pouring valve (6) and the pressurizing pump (13);
s72: firstly, closing a grouting material pouring valve (6), and then adding grouting material into a pressurizing pump (13);
s73: opening a grouting material pouring valve (6), starting a pressurizing pump (13), pouring grouting material above the reinforcing plate template (4) until the poured grouting material reaches the designed thickness, closing the grouting material pouring valve (6), and taking down a grouting material pipe (12);
step eight: synchronously and integrally moving the reinforcing plate template (4) upwards;
when the grouting material poured in the step seven reaches the initial setting time, synchronously adjusting a lifting screw (8) at the upper part of the steel support column (7), so that the whole reinforcing plate template (4) is synchronously lifted upwards by 1-3 mm, the lifting process is divided into a plurality of times, the lifting distance of the reinforcing plate template (4) upwards is the same each time, the lifting distance is controlled by comparing the numerical value of the infrared measuring ruler (11), and the whole reinforcing plate template (4) is ensured to be horizontal in the lifting process;
step nine: removing the vertical supporting mechanism and detecting the strength;
removing the vertical supporting mechanism after curing the grouting material poured in the step seven to the design age, comparing and observing the numerical value of the infrared measuring ruler (11) before and after removing, recovering the vertical supporting mechanism if the numerical value has excessive change, removing the vertical supporting mechanism after deformation tends to be stable, removing the reinforcing plate template (4) after removing the vertical supporting mechanism, detecting the strength of the newly poured reinforcing plate (14), reworking the step seven if the strength does not meet the requirement, and carrying out the step ten if the strength meets the requirement;
step ten: treating grouting materials at the bottom of the plate;
and (3) removing grouting materials from the grouting material valve (6) to the bottom of the reinforcing plate template (4) to ensure the flatness of the bottom of the reinforcing plate template (4).
2. A method of reinforcing a concrete floor slab severely rusted with steel bars according to claim 1, wherein in step four, the number of vertical supporting mechanisms is set according to the calculation result of the load and deformation.
3. The method for reinforcing the concrete floor slab severely rusted by the steel bar according to claim 1 or 2, characterized in that in the fifth step, the liftable screw rod (8) is composed of a supporting sleeve (16) positioned at the lower part and a supporting rod body (17) positioned at the upper part, an internal thread hole is formed in the upper axis of the supporting sleeve (16), an external thread structure is formed on the rod body of the supporting rod body (17), the lower part of the supporting rod body (17) is connected in the internal thread hole of the supporting sleeve (16) through thread matching, an adjusting block (18) is fixedly connected to the outer part of the upper end of the supporting rod body (17), and the cross section of the adjusting block (18) is in a regular polygon shape.
4. A method of reinforcing a concrete floor slab in which the reinforcing bars are severely rusted according to claim 3, wherein in step one, the unloading is performed while ensuring that the finishing layer of the upper portion of the floor slab (1) to be reinforced is not damaged.
5. The method for reinforcing a concrete floor slab severely rusted with steel bars according to claim 4, wherein the removing operation in the step ten is performed by using a cutter.
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Citations (4)
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|---|---|---|---|---|
| CN103375031A (en) * | 2012-04-11 | 2013-10-30 | 中冶建筑研究总院有限公司 | Rust inhibition repairing method for rusted concrete structures |
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| CN213898251U (en) * | 2020-11-30 | 2021-08-06 | 华北科技学院 | Horizontal structure reinforcing steel bar compensation reinforced structure |
| CN115234025A (en) * | 2022-07-20 | 2022-10-25 | 中建八局西南建设工程有限公司 | Concrete floor thickening construction method |
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- 2023-02-17 CN CN202310130146.7A patent/CN116044204A/en active Pending
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| CN103375031A (en) * | 2012-04-11 | 2013-10-30 | 中冶建筑研究总院有限公司 | Rust inhibition repairing method for rusted concrete structures |
| KR20190091397A (en) * | 2018-01-27 | 2019-08-06 | 양병진 | Grouting method for joint portion of concrete structure in construction and top-down joint grouting method for underground structure using the same |
| CN213898251U (en) * | 2020-11-30 | 2021-08-06 | 华北科技学院 | Horizontal structure reinforcing steel bar compensation reinforced structure |
| CN115234025A (en) * | 2022-07-20 | 2022-10-25 | 中建八局西南建设工程有限公司 | Concrete floor thickening construction method |
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