CN104746890B - Method for strengthening dense-rib hollow brick floor slab - Google Patents
Method for strengthening dense-rib hollow brick floor slab Download PDFInfo
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- CN104746890B CN104746890B CN201510046759.8A CN201510046759A CN104746890B CN 104746890 B CN104746890 B CN 104746890B CN 201510046759 A CN201510046759 A CN 201510046759A CN 104746890 B CN104746890 B CN 104746890B
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- reinforcing bar
- girt strip
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- hollow brick
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Abstract
The invention discloses a method for strengthening a dense-rib hollow brick floor slab. The method comprises the following steps that (1) a local decoration layer of the bottom of the floor slab is shoveled away, concrete at the bottom of a ribbed beam is exposed, and a structural damage area is determined; (2) the structure, at the bottom of the ribbed beam, of the structural damage area is scraped and chiseled, and exposed former steel ribs with the rusting phenomenon are completely exposed; (3) new steel ribs are used for replacing the exposed former steel ribs with the rusting phenomenon, and the two ends of the new steel ribs are fixed to the original structure; (4) a plurality of J-shaped shearing force pins are implanted in the steel rib replacing area at the bottom of the ribbed beam to hook the new steel ribs; (5) polymer mortar is pressed and plastered layer by layer till the polymer mortar is flush with the designed elevation of the bottom face of a concrete protection layer of the bottom of the ribbed beam; (6) the damaged decoration layer is restored. The method has the advantages that pertinence is high, the influence on the original building structure is small, the strengthening effect is good, and the engineering manufacturing cost is low.
Description
Technical field
The present invention relates to a kind of floor reinforcement means, particularly a kind of close rib hollow brick floor reinforcement means.
Background technology
Part floor in historical sites and landmark adopts close rib hollow brick floor.Close rib hollow brick floor is by one
The hollow brick composition filled between the relatively thin armoured concrete slab of layer or concrete slab and intensive armored concrete girt strip and girt strip.
The hollow brick filled between girt strip be able to can meet in building structure again as the template of top (reinforcing bar) concrete slab and girt strip
Sound insulation and insulation requirement.At present, there is different degrees of structural failure in the close rib hollow brick floor in part in above-mentioned building, mainly
Phenomenon is the protective layer peeling of girt strip lower concrete, reinforcing steel bars exposed, corrosion etc..
Traditional reinforcement means of close rib hollow brick superstructure is：Monolayer arrangement of reinforcement grouting material is poured in close rib hollow brick floor bottom
Layer.The program needs to root out the original finishing layer of close rib hollow brick floor face, also needs to be recovered after the completion of reinforcing；In order to protect
The pouring quality of the card grouting bed of material, needs to punch floor；Floor clear height will at least reduce 60mm after the completion of strengthening construction, right
Space has affected, while floor deadweight will increase after reinforcing.In sum, traditional reinforcement means is to existing building structure
Destroy larger and complicated construction technique.
The content of the invention
The present invention provides a kind of close rib hollow brick floor reinforcement means to solve technical problem present in known technology,
The method has the advantages that with strong points, little to existing building structure influence, consolidation effect is good and low engineering cost.
The present invention is adopted the technical scheme that to solve technical problem present in known technology：A kind of close rib hollow brick
Floor reinforcement means, using following steps：1) presence of correspondence girt strip bottom exposes and the old reinforcing bar failure area of corrosion phenomena is shoveled
Except layer is fitted up in the local of floor slab bottoms, the exposed concrete of girt strip bottom is made, determine structural failure region；2) chisel structural failure is picked
The structure of region girt strip bottom, exposes presence and the old reinforcing bar of corrosion phenomena exposes completely；3) replaced using new reinforcing bar and existed
Expose and corrosion phenomena old reinforcing bar, and two ends of new reinforcing bar is fixed on original structure；4) replace in girt strip bottom
Reinforcing bar region is implanted into multiple " J " shape shear pins, and new reinforcing bar is hooked on into girt strip bottom；5) reinforcing bar region is replaced in girt strip bottom
After visual concrete is with water moistening, polymer mortar is smeared using pressure is manually layered in one direction, until polymer mortar and rib
The floor design absolute altitude of the concrete cover of beam bottom is equal；6) destroyed finishing layer is restored.
The step 4)：Make to be located at all " J " shape shear pins that floor end is not more than in the range of 1/4 floor span according to
The spacing of 200mm is arranged, and all " J " the shape shear pins in the range of remaining are arranged according to the spacing of 500mm.
The step 2)：Counter structure failure area, picks structure wall of the chisel below girt strip two ends, forms grouting
Hole；Pick the concrete of chisel girt strip bottom, expose presence and the old reinforcing bar of corrosion phenomena along its, span direction is elongated exposes；It is described
Step 3)：Using along the elongated arrangement in span direction new reinforcing bar replace exist expose and corrosion phenomena old reinforcing bar, the new steel
The two ends of muscle are equipped with the anchoring section of downward 90-degree bent, grouting material is poured into grout hole and forms girt strip pad, make the two ends of new reinforcing bar
Anchoring section is anchored in girt strip pad.
The step 2)：Counter structure failure area, picks chisel and is located at structure of the girt strip below structural failure area end
Body of wall, forms grout hole, picks the local concrete of chisel girt strip bottom, expose presence and corrosion phenomena old reinforcing bar along its span
Expose direction local；The step 3)：Presence is replaced using the new reinforcing bar arranged along span direction local to expose and corrosion phenomena
Old reinforcing bar, one end of the new reinforcing bar is provided with the anchoring section of downward 90-degree bent, grouting material is poured into grout hole and forms girt strip
Pad, the anchoring section for making new reinforcing bar is anchored in girt strip pad, and the other end of the new reinforcing bar is provided with down and bends up lap segment, the new steel
Curved lap segment with girt strip with the end of the reinforcing bar of corrosion weld by original not exposing under muscle.
The step 2)：Counter structure failure area, picks the local concrete of chisel girt strip bottom, exposes presence and corrosion
The old reinforcing bar of phenomenon exposes along span direction local；The step 3)：Replaced using the new reinforcing bar arranged along span direction local
Presence expose and corrosion phenomena old reinforcing bar, the two ends of the new reinforcing bar are equipped with down curved lap segment, curved under the new reinforcing bar
Original not exposing is welded with the end of the reinforcing bar of corrosion with girt strip to play lap segment.
The step 3) in new reinforcing bar diameter expose with the presence replaced by it and corrosion phenomena old reinforcing bar it is straight
Footpath is identical.
The anchorage length of the anchoring section of the new reinforcing bar is not less than 120mm.
The overlap joint weld length that lap segment is bent up under the new reinforcing bar is not less than 6 times of new bar diameters.
The bar planting depth of " J " the shape shear pin is counted not from the floor design absolute altitude of the lower concrete protective layer of girt strip
Less than 120mm, the vertical segment length of eave tile of " J " the shape shear pin is not less than 20mm.
The step 5), the polymer mortar that layering pressure is smeared, every layer of THICKNESS CONTROL is in 10mm.
The present invention has the advantages and positive effects that：Girt strip for there is structural failure phenomenon is reinforced, and is passed through
Old reinforcing bar is replaced using new reinforcing bar and the bearing capacity and stiffness for strengthening close rib hollow brick floor is set up by the way of shear pin, after smear poly-
Compound mortar is good with girt strip concrete binding effect, cracking resistance and excellent in durability, can effectively suppress the corrosion of new reinforcing bar；
And floor clear height is constant after the completion of strengthening construction, and space is not affected.The research of Jing situ loadings and engineering reality
Proof is trampled, compared with traditional reinforcement means, the present invention has with strong points, little to existing building structure influence, consolidation effect
Well, the advantages of low engineering cost.
Description of the drawings
Fig. 1-1 is the structural representation of the embodiment of the present invention 1；
Fig. 1-2 is the structural representation of the embodiment of the present invention 2；
Fig. 1-3 is the structural representation of the embodiment of the present invention 3；
Fig. 2 is Fig. 1-1, the sectional view of Fig. 1-2 and Fig. 1-3；
Fig. 3 is that the new reinforcing bar of the present invention welds schematic diagram with original not exposing with the bar splicing of corrosion；
Fig. 4 is using the bread board band load-mid-span deflection curve chart of the present invention.
In figure：1st, girt strip；2nd, girt strip pad；3rd, new reinforcing bar；4th, " J " shape shear pin；5th, polymer mortar；6th, it is original not expose
With the reinforcing bar of corrosion.
Specific embodiment
For the content of the invention, feature and effect of the present invention can be further appreciated that, following examples are hereby enumerated, and coordinate accompanying drawing
Describe in detail as follows：
Refer to accompanying drawing, a kind of close rib hollow brick floor reinforcement means, using following steps：
1) correspondence girt strip 1 bottom exists and exposes and the old reinforcing bar failure area of corrosion phenomena roots out the local dress of floor slab bottoms
Layer is repaiied, the exposed concrete of the bottom of girt strip 1 is made, structural failure region is determined；2) knot of the bottom of chisel structural failure region girt strip 1 is picked
Structure, exposes presence and the old reinforcing bar of corrosion phenomena exposes completely；3) replace to exist using new reinforcing bar 3 and expose and corrosion phenomena
Old reinforcing bar, and two ends of new reinforcing bar 3 is fixed on original structure；4) implantation of reinforcing bar region is replaced in the bottom of girt strip 1 many
Individual " J " shape shear pin 4, by new reinforcing bar 3 bottom of girt strip 1 is hooked on；5) bottom of girt strip 1 is replaced the visual concrete in reinforcing bar region
After with water moistening, polymer mortar 5 is smeared using pressure is manually layered in one direction, until polymer mortar and the bottom of girt strip 1
The floor design absolute altitude of concrete cover is equal；6) destroyed finishing layer is restored.
According to the principle that beam slab end needs to strengthen, in above-mentioned steps 4) in：Make to be not more than 1/4 floor positioned at floor end
All " J " shape shear pins in span scope are arranged according to the spacing of 200mm, and all " J " the shape shear pins in the range of remaining are pressed
Arrange according to the spacing of 500mm.
In the bottom of girt strip 1, presence exposes and the old reinforcing bar failure area of corrosion phenomena divides three kinds of situations：
Fig. 1-1 and Fig. 2 is referred to, the first situation：Along span direction, elongated presence exposes and corrosion the old reinforcing bar of girt strip 1
Phenomenon.For this kind of situation, above-mentioned steps 2) further specific practice be：Counter structure failure area, picks chisel and is located at girt strip 1
Structure wall below two ends, forms grout hole；Pick the concrete of chisel girt strip 1 bottom, expose presence and corrosion phenomena it is old
Span direction is elongated exposes completely along its for reinforcing bar；Above-mentioned steps 3) further specific practice be：Using elongated along span direction
Arrangement new reinforcing bar replace exist expose and corrosion phenomena old reinforcing bar, the two ends of the new reinforcing bar are equipped with downward 90-degree bent
Anchoring section, grouting material is poured into grout hole and forms girt strip pad 2, the two ends anchoring section for making new reinforcing bar 3 is anchored in girt strip pad 2.
Refer to Fig. 1-2, Fig. 2 and Fig. 3, second situation：There is exposing near structure wall in the old reinforcing bar of girt strip 1
And corrosion phenomena.For this kind of situation, above-mentioned steps 2) further specific practice be：Counter structure failure area, picks chisel position
In structure wall of the girt strip below structural failure area end, grout hole is formed, picks the local concrete of chisel girt strip 1 bottom,
Expose presence and the old reinforcing bar of corrosion phenomena exposes along its span direction local；The step 3) further specific practice
For：Using along span direction local arrange new reinforcing bar 3 replace exist expose and corrosion phenomena old reinforcing bar, the new reinforcing bar 3
One end be provided with the anchoring section of downward 90-degree bent, grouting material is poured into grout hole and forms girt strip pad 2, make the anchoring section of new reinforcing bar 3
Be anchored in girt strip pad 2, the other end of the new reinforcing bar 3 is provided with down and bends up lap segment, under the new reinforcing bar 3 curved lap segment with
Original not exposing is welded with the end of the reinforcing bar 6 of corrosion in girt strip 1.
In above-mentioned the first situation and second situation, the anchorage length of the anchoring section of the new reinforcing bar 3 is not less than
120mm。
Fig. 1-3, Fig. 2 and Fig. 3 are referred to, the third situation：The old reinforcing bar of girt strip 1 exists in the middle part of its span and exposes and become rusty
Erosion phenomenon.For this kind of situation, the step 2) further specific practice be：Counter structure failure area, picks chisel girt strip 1 bottom
The local concrete in portion, exposes presence and the old reinforcing bar of corrosion phenomena exposes along span direction local；Above-mentioned steps 3) enter
One step specific practice is：Using along span direction local arrange new reinforcing bar 3 replace exist expose and corrosion phenomena old reinforcing bar,
The two ends of the new reinforcing bar 3 are equipped with down curved lap segment, bend up that lap segment is original with girt strip not to be exposed under the new reinforcing bar 3
Weld with the end of the reinforcing bar 6 of corrosion.
In above-mentioned second situation and the third situation, the overlap welding spreading of lap segment is bent up under the new reinforcing bar 3
Degree is not less than 6 times of new bar diameters, it is ensured that new reinforcing bar 3 can effective force with the reinforcing bar 6 of corrosion with original not exposing.
In above-mentioned three kinds of situations, the bar planting depth of " J " shape shear pin 4 is from the bottom surface of the lower concrete protective layer of girt strip
Designed elevation is counted not less than 120mm, and the vertical segment length of eave tile of " J " shape shear pin 4 is not less than 20mm, so that the energy of shear pin 4
Enough fix new reinforcing bar 3.The diameter of new reinforcing bar 3 expose with the presence replaced by it and corrosion phenomena old reinforcing bar diameter it is identical.
The polymer mortar that layering pressure is smeared, every layer of THICKNESS CONTROL is in 10mm.In the present embodiment polymer mortar adopts I grade of polymer sand
Slurry.
The application example of the present invention：
The close rib hollow brick floor of certain office building carries out test construction and situ loading using above-mentioned reinforcement means.Examination
Test plate I and bread board and be 4.2m with II span, width is 900mm, and girt strip centre-to-centre spacing is each about 300mm, girt strip width
Between 60mm～75mm, girt strip clear height is each about 100mm, and thereon reinforced concrete floor thickness is about 70mm.Each rib
Beam bottom is provided with the corrugated bar of 1 a diameter of 16mm.Wherein bread board is with I reinforcing mode is for elongated replacement reinforcing bar and increases
If smearing polymer mortar situation after shear pin, bread board is replaced reinforcing bar and is set up after shear pin and smears with II reinforcing mode for local
Polymer mortar situation.
Test is proved：After, can effectively prevent reinforce after close rib good with former girt strip concrete binding effect of smearing polymer mortar
Hollow brick floor ftractures.Local replace reinforcing bar can be connected to become with raw steel muscle it is overall and can be in effective force under load action.
After being reinforced using the method, the bearing capacity and rigidity of floor increase.Fig. 4 is referred to, internal loading grade is fitted in Fig. 4 brackets
Situation before reinforcing with I for bread board.From fig. 4, it can be seen that for before and after the reinforcing of bread board band I, first order load
(1.2kN/m2) to fourth stage load (4.8kN/m2) load-mid-span deflection curve it is linear and basically identical, show bread board
Rigidity is basically identical in elastic stage and before and after reinforcing for band I；It is loaded onto level V load (6.0kN/m2) when, bread board band I
Mid-span deflection before and after reinforcing is respectively 3.43mm and 3.02mm, reduces before mid-span deflection is than reinforcing after the reinforcing of bread board band I
12%, show that bread board increases with the rigidity after I reinforcing.After reinforcing with bread board band II after bread board band I is reinforced
For, in whole loading procedure, the mid-span deflection after bread board is reinforced with II is significantly less than the span centre after bread board is reinforced with I
Amount of deflection, test in loading procedure after the mid-span deflection after strip II is reinforced is reinforced than test strip I and reduce 43.2% respectively～
55.3%.
Although being described to the preferred embodiments of the present invention above in conjunction with accompanying drawing, the invention is not limited in
The specific embodiment stated, above-mentioned specific embodiment is only schematic, be not it is restricted, this area it is common
Technical staff in the case of without departing from present inventive concept and scope of the claimed protection, may be used also under the enlightenment of the present invention
To make many forms, these are belonged within protection scope of the present invention.
Claims (10)
1. a kind of close rib hollow brick floor reinforcement means, it is characterised in that adopt following steps：
1) correspondence girt strip bottom exists and exposes and the old reinforcing bar failure area of corrosion phenomena roots out the local finishing layer of floor slab bottoms,
The exposed concrete of girt strip bottom is made, structural failure region is determined；
2) structure of chisel structural failure region girt strip bottom is picked, presence is exposed and the old reinforcing bar of corrosion phenomena is exposed completely；
3) using new reinforcing bar replace exist expose and corrosion phenomena old reinforcing bar, and make new reinforcing bar two ends be fixed on it is original
In structure；
4) replace reinforcing bar region in girt strip bottom and be implanted into multiple " J " shape shear pins, new reinforcing bar is hooked on into girt strip bottom；
5) after the visual concrete in girt strip bottom replacement reinforcing bar region is moistened with water, smeared using pressure is manually layered in one direction
Polymer mortar, until polymer mortar is equal with the floor design absolute altitude of the concrete cover of girt strip bottom；
6) destroyed finishing layer is restored.
2. close rib hollow brick floor reinforcement means according to claim 1, it is characterised in that the step 4)：Make to be located at
Floor end is not more than all " J " the shape shear pins in the range of 1/4 floor span and arranges according to the spacing of 200mm, remaining scope
Interior all " J " shape shear pins are arranged according to the spacing of 500mm.
3. close rib hollow brick floor reinforcement means according to claim 2, it is characterised in that the step 2)：Correspondence knot
Structure failure area, picks structure wall of the chisel below girt strip two ends, forms grout hole；The concrete of chisel girt strip bottom is picked, is made
Presence expose and the old reinforcing bar of corrosion phenomena along its, span direction is elongated exposes；
The step 3)：Using along the elongated arrangement in span direction new reinforcing bar replace exist expose and corrosion phenomena old reinforcing bar,
The two ends of the new reinforcing bar are equipped with the anchoring section of downward 90-degree bent, grouting material is poured into grout hole and forms girt strip pad, make new steel
The two ends anchoring section of muscle is anchored in girt strip pad.
4. close rib hollow brick floor reinforcement means according to claim 2, it is characterised in that the step 2)：Correspondence knot
Structure failure area, picks chisel and is located at structure wall of the girt strip below structural failure area end, forms grout hole, picks chisel girt strip bottom
The local concrete in portion, exposes presence and the old reinforcing bar of corrosion phenomena exposes along its span direction local；
The step 3)：Using along span direction local arrange new reinforcing bar replace exist expose and corrosion phenomena old reinforcing bar,
One end of the new reinforcing bar is provided with the anchoring section of downward 90-degree bent, grouting material is poured into grout hole and forms girt strip pad, makes new reinforcing bar
Anchoring section be anchored in girt strip pad, the other end of the new reinforcing bar is provided with down and bends up lap segment, curved under the new reinforcing bar to take
Original not exposing is welded with the end of the reinforcing bar of corrosion with girt strip to connect section.
5. close rib hollow brick floor reinforcement means according to claim 2, it is characterised in that the step 2)：Correspondence knot
Structure failure area, picks the local concrete of chisel girt strip bottom, expose presence and corrosion phenomena old reinforcing bar along span direction office
Expose in portion；
The step 3)：Using along span direction local arrange new reinforcing bar replace exist expose and corrosion phenomena old reinforcing bar,
The two ends of the new reinforcing bar are equipped with down curved lap segment, bend up under the new reinforcing bar in lap segment and girt strip it is original do not expose and
The end welding of the reinforcing bar of corrosion.
6. close rib hollow brick floor reinforcement means according to claim 1, it is characterised in that the step 3) in new steel
The diameter of muscle expose with the presence replaced by it and corrosion phenomena old reinforcing bar diameter it is identical.
7. the close rib hollow brick floor reinforcement means according to claim 3 or 4, it is characterised in that the anchor of the new reinforcing bar
Gu the anchorage length of section is not less than 120mm.
8. the close rib hollow brick floor reinforcement means according to claim 4 or 5, it is characterised in that under the new reinforcing bar
The overlap joint weld length for bending up lap segment is not less than 6 times of new bar diameters.
9. close rib hollow brick floor reinforcement means according to claim 1, it is characterised in that " J " the shape shear pin
Bar planting depth is counted not less than 120mm from the floor design absolute altitude of the lower concrete protective layer of girt strip, " J " the shape shear pin
The vertical segment length of eave tile be not less than 20mm.
10. close rib hollow brick floor reinforcement means according to claim 1, it is characterised in that the step 5), layering pressure
The polymer mortar smeared, every layer of THICKNESS CONTROL is in 10mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510046759.8A CN104746890B (en) | 2015-01-29 | 2015-01-29 | Method for strengthening dense-rib hollow brick floor slab |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510046759.8A CN104746890B (en) | 2015-01-29 | 2015-01-29 | Method for strengthening dense-rib hollow brick floor slab |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104746890A CN104746890A (en) | 2015-07-01 |
| CN104746890B true CN104746890B (en) | 2017-04-12 |
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| CN201510046759.8A Expired - Fee Related CN104746890B (en) | 2015-01-29 | 2015-01-29 | Method for strengthening dense-rib hollow brick floor slab |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107447902A (en) * | 2017-09-21 | 2017-12-08 | 中标建设集团股份有限公司 | A kind of prefabricated arch hollow block and its joist cast-in-situ monoblock type floor construction |
| CN109914842A (en) * | 2017-12-12 | 2019-06-21 | 中冶建筑研究总院（上海）有限公司 | A kind of concrete floor structure and its reinforcement means with secondary beam |
| CN111719883B (en) * | 2020-03-21 | 2021-08-31 | 东莞市大乘建筑工程技术有限公司 | Joint structure for reinforcing new and old concrete by increasing section and construction method |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0065089B1 (en) * | 1981-05-18 | 1984-12-05 | Carl, Heinz, Ing.grad. | Displacement body |
| JP3770772B2 (en) * | 2000-05-25 | 2006-04-26 | 泰稔 山本 | Concrete wall reinforcement structure |
| CN201261924Y (en) * | 2008-09-17 | 2009-06-24 | 新蒲建设集团有限公司 | Anticracking prefabricated floor cover board |
| CN201554235U (en) * | 2009-10-12 | 2010-08-18 | 上海维固工程实业有限公司 | Polymer modified cement mortar reinforcement mesh surface layer reinforcing structure |
| CN201778501U (en) * | 2010-08-23 | 2011-03-30 | 华侨大学 | Slabstone floor system reinforcing structure |
| CN103161322B (en) * | 2011-12-16 | 2016-08-03 | 贵州中建建筑科研设计院有限公司 | The reinforcement means of a kind of improvement of original construction floor and ruggedized construction |
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