CN106437191B - A kind of special-shaped bracing means and its construction method of beams of concrete - Google Patents
A kind of special-shaped bracing means and its construction method of beams of concrete Download PDFInfo
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- CN106437191B CN106437191B CN201610891583.0A CN201610891583A CN106437191B CN 106437191 B CN106437191 B CN 106437191B CN 201610891583 A CN201610891583 A CN 201610891583A CN 106437191 B CN106437191 B CN 106437191B
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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
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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
- E04G23/0244—Increasing or restoring the load-bearing capacity of building construction elements of beams at places of holes, e.g. drilled in them
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- Engineering & Computer Science (AREA)
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
Abstract
The invention discloses a kind of special-shaped bracing means of beams of concrete, the bracing means is the aluminium alloy groove body for having a groove；The cross sectional shape of the aluminium alloy groove body is abnormity, which is fixedly attached to beams of concrete bottom outer.The special-shaped bracing means section form multiplicity of beams of concrete of the present invention, structure stress is more scientific and reasonable, high-strength light, and durability is more preferable, fire resistance is good, promotes beam body bending stiffness, and construction is simple is at low cost.
Description
Technical field
The invention belongs to bridge structure technical field, in particular to the special-shaped bracing means of a kind of beams of concrete and its construction
Method.
Background technique
Currently, the method that concrete girder is reinforced mainly has bonding steel plate method and pasting carbon fiber composite material material method.
Bonding steel plate method is by realizing the raising of joist support loading capability being reinforced beam body bottom affixing steel plate.It pastes
Steel plate method ruggedized construction is in the form of a single, and ruggedized construction reasonability is to be improved, cannot give full play to the mechanics material property of steel；
There is steel plate corrosion, especially coastal area in bonding steel plate method, the service life of bonding steel plate method is directly affected, after increase
Phase derusting maintenance cost；Steel plate density is 7850kg/m3, affixing steel plate is affected to dead load.
Pasting carbon fiber composite material material method is by realizing joist support being reinforced beam bottom portion pasting carbon fiber composite material material
The raising of loading capability.There are under durability and problem of aging, especially complexity adverse circumstances for carbon fibre composite method；Carbon fiber
Composite material not fire resisting, fire will lead to bearing capacity forfeiture；The bearing capacity that sticking carbon fiber material improves beam body is lower, carbon
The rate of utilization of strength of fibrous material is not high.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of section form multiplicity, and structure stress is more scientific and reasonable, lightweight
High-strength, durability is more preferable, fire resistance is good, promotes beam body bending stiffness, and the abnormity of construction is simple, beams of concrete at low cost is reinforced
Device and its construction method.
The present invention solves above-mentioned technical problem using following technical scheme:
A kind of special-shaped bracing means of beams of concrete, the bracing means are the aluminium alloy groove body for having a groove；The aluminium closes
The cross sectional shape of golden groove body is abnormity, which is fixedly attached to beams of concrete bottom outer.
The outer surface of the groove inner surface and beams of concrete bottom is bolted by structure glue connection, the side wall of groove
Beams of concrete.
A kind of construction method of the special-shaped bracing means of beams of concrete, steps are as follows:
1. concrete beam strengthening area is surface-treated:
The surface layer mortar for cutting concrete beam strengthening area forms smooth rough surface and cleans out, again with toluene or work
Industry acetone wipes stabilization zone surface；
2. drilling: in the two sides of beams of concrete, the bolt corresponding to bracing means connects drilling；It is bored on bracing means
Hole for injecting glue；
3. installing bracing means:
The bracing means is processed according to design requirement, the groove inner surface of bracing means is subjected to derusting and coarse processing
And it cleans out；Bracing means is covered outside beams of concrete bottom and is bolted, the groove inner surface and coagulation of bracing means
There are the gaps of 1~3mm between the outer surface Tu Liang；
4. edge sealing: exhaust pipe is inserted into bracing means apical margin, with closing glue closed reinforcement device edge；
5. preparing structure glue；
6. perfusion: structure glue being filled into the gap of bracing means and beams of concrete by hole for injecting glue, until exhaust pipe
There is glue outflow.
The step 1. in cut the surface layer mortar of concrete beam strengthening area 2~5mm thickness.
The structure glue pump of the step 6. is perfused with the pressure of 0.2~0.4MPa from hole for injecting glue.
The beneficial effects of the present invention are:
(1) in terms of structure type.Compared with affixing steel plate and pasting carbon fiber composite material material, reinforcing dress of the invention
It sets, section form is varied, and structure stress is more scientific and reasonable, and the high-strength light that can fully play aluminum alloy materials is special
Property, and advantage reasonable in design can be utilized well.
(2) in terms of durability.Compared with bonding steel plate method, the corrosion of structure is not present using bracing means of the invention
Problem, adaptation range is wider, especially the beams of concrete structure of coastal area, does not need additional corrosion-proof coating, Neng Goujie
About a large amount of maintenance costs；Compared with pasting carbon fiber composite material material, there is no the problem of aging under Sunlight Action, and durability is more
It is good.
(3) in terms of fire resistance.Sticking FRP method there is a problem of one it is significant be exactly that fire resistance is poor, under fire effect
Moment bearing capacity can be lost, and bracing means of the invention is still able to maintain original bearing capacity under fire effect.
(4) in terms of being influenced on structure.Since the density of aluminium alloy is steel density 1/3, compared with bonding steel plate method,
Under the same volume, the influence of bracing means of the invention to dead load is smaller.
(5) in terms of stock utilization.Due to bonding steel plate method and the reinforcement form of pasting carbon fiber composite material material method and
Section is relatively simple, and bracing means not high to the utilization rate of material, of the invention can be preferably by the change of cross sectional shape
Realize the promotion to beam body bending stiffness.
(6) in terms of structure stress.The different cross section shape of bracing means of the invention is able to achieve different beam body bearing capacities
Promote the requirement of grade.
(7) bracing means structure of the present invention is simple, and construction method is simple to operation, at low cost.
Detailed description of the invention
Fig. 1 is the structural schematic diagram after the special-shaped bracing means installation of 1 beams of concrete of the embodiment of the present invention, in figure, 1: mixed
Solidifying Tu Liang, 2: bracing means, 3: bolt.
Fig. 2 is the structural schematic diagram after the special-shaped bracing means installation of 2 beams of concrete of the embodiment of the present invention, in figure, 1: mixed
Solidifying Tu Liang, 2: bracing means, 3: bolt.
Fig. 3 is the structural schematic diagram after the special-shaped bracing means installation of 3 beams of concrete of the embodiment of the present invention, in figure, 1: mixed
Solidifying Tu Liang, 2: bracing means, 3: bolt.
Fig. 4 is the structural schematic diagram after the special-shaped bracing means installation of 4 beams of concrete of the embodiment of the present invention, in figure, 1: mixed
Solidifying Tu Liang, 2: bracing means, 3: bolt.
Fig. 5 is the structural schematic diagram after the special-shaped bracing means installation of 5 beams of concrete of the embodiment of the present invention, in figure, 1: mixed
Solidifying Tu Liang, 2: bracing means, 3: bolt.
Specific embodiment
It elaborates, but does not constitute to this to a specific embodiment of the invention below in conjunction with the drawings and specific embodiments
The limitation of invention claims.
Embodiment 1:
As shown in Figure 1, a kind of special-shaped bracing means of beams of concrete, the bracing means 2 is the aluminium alloy for having a groove
Groove body；The cross sectional shape of the aluminium alloy groove body are as follows: top is rectangular recess shape, and lower part is irpiciform.The groove inner surface with
The outer surface of 1 bottom of beams of concrete connects beams of concrete 1 by bolt 3 by structure glue connection, the side wall of groove.
The construction method of the special-shaped bracing means of above-mentioned beams of concrete, steps are as follows:
1. concrete beam strengthening area is surface-treated: being released on the surface of beams of concrete and reinforce position full-page proof, cut stabilization zone
The surface layer mortar of 2~5mm of surface thickness, makes exposed concrete, and forms smooth rough surface, whole with diamond bit soft peening at uneven surface
It is flat.Surface laitance is removed with wire wheel again, surface layer loose matter is rejected, finally blows off surface dust with compressed air, and use toluene
Or industrial acetone wipes stabilization zone surface.It is smooth using polymer cement mortar reparation after processing to the layer inferior of larger area,
It is scrubbed before reinforcing with acetone.
2. drilling
Prepare: checking whether beams of concrete surface is intact, visits instrument detection with reinforcing bar and find out that reinforcing bar is distributed, verification label anchor bolt
Position；
Drilling: requiring according to Bolt sizes and bracing means connection design requirement drills respectively in beams of concrete two sides；
Borehole cleaning: it is blown three times, it is ensured that hole wall is dustless using compressed air borehole cleaning with hairbrush brush three times.It can be used when necessary clean
Cotton is stained with a small amount of acetone or wipes of alcohol clear opening wall.
The abnormal phenomenon such as confirmation anchoring packet, medicament solidification damaged without appearance, put it into hole and are pushed into bottom hole.
Using electric hammer or electric drill and dedicated installs fixture, bolt strength is rotatably inserted into until bottom hole, smashes glass to reach
Glass pipe and strength mix the purpose of anchoring packet medicament.The revolving speed of electric hammer or electric drill should be adjusted to shelves at a slow speed, and should not use impact side
Formula.
It when being threaded to mark position on bottom hole or bolt, stops rotating at once, removes installs fixture, to completely solid after gel
It avoids disturbing before change.Time-out rotation will lead to glue loss, influence anchor force.
Whether visual examination solidification is normal.The bolt of significant points need to carry out live pullout tests, its anchor force is examined to be
It is no to meet design requirement, the construction of next process can be carried out after qualified.
3. installing bracing means
Practical setting-out according to on-site concrete beam carries out the blanking and processing of the bracing means, and 2. existing according to step
Plant the bolt that buries, mating punching carried out to bracing means, then by the groove inner surface of bracing means polishing abrasive machine or
Steel wire brush grinding machine carries out derusting and coarse processing, and polishing roughness is the bigger the better, and polishing lines should be with bracing means Impact direction
Vertically.Groove inner surface wiped clean of the acetone by bracing means is stained with absorbent cotton.Bracing means is fixed on bolt, and is protected
The gap of bracing means and beams of concrete outer surface is demonstrate,proved in 1~3mm, to ensure that the thickness of glue-line is perfused.
4. edge sealing:
Hole for injecting glue is bored on bracing means；Injecting socket is bonded in the hole for injecting glue of bracing means, in bracing means apical margin
It is inserted into exhaust pipe, exhaust outlet should be higher than that bracing means；Closing glue is smeared on bolt head and covers upper teabowl with a cover, is then used and is reinforced
Edge sealing is completed in device edge sealing adhesive closed reinforcement device edge.
5. structure glue is prepared:
Structure glue is prepared as required, and structure glue low-speed agitator stirs evenly, is finished within working life.Structure glue
Should edge sealing complete and bracing means edge sealing adhesive reach enough intensity has been fully cured after prepared and used again.
6. being perfused
Structure glue is filled into the gap between bracing means and beams of concrete from hole for injecting glue with pump, until all exhausts
Guan Jun has glue outflow.In filling process, it is closely knit to be confirmed whether to be perfused to beat bracing means with rubber hammer.It is required that perfusion
Structure glue is pressed by preceding pressure testing of first ventilating with the pressure of 0.2~0.4MPa from injecting socket, stops adding after slurries occurs in exhaust pipe
Pressure, with edge sealing adhesive plug-hole, then with lower pressure maintenance 10 minutes or more, until slurries are from the top hole for injecting glue or exhaust pipe stream
Out.
Embodiment 2:
As shown in Fig. 2, a kind of special-shaped bracing means of beams of concrete, the bracing means 2 is the aluminium alloy for having a groove
Groove body；The cross sectional shape of the aluminium alloy groove body are as follows: top is rectangular recess shape, and lower part is four square grids side by side, wherein often
The bottom of a side's grid is jagged.Remaining is the same as embodiment 1.
Embodiment 3:
As shown in figure 3, a kind of special-shaped bracing means of beams of concrete, the bracing means 2 is the aluminium alloy for having a groove
Groove body；The cross sectional shape of the aluminium alloy groove body are as follows: top is rectangular recess shape, and lower part is four square grids side by side.Remaining is same
Embodiment 1.
Embodiment 4:
As shown in figure 4, a kind of special-shaped bracing means of beams of concrete, the bracing means 2 is the aluminium alloy for having a groove
Groove body；The cross sectional shape of the aluminium alloy groove body are as follows: top is rectangular recess shape, and lower part is spliced into big for multiple right angled triangles
Grid.Remaining is the same as embodiment 1.
Embodiment 5:
As shown in figure 5, a kind of special-shaped bracing means of beams of concrete, the bracing means 2 is the aluminium alloy for having a groove
Groove body；The cross sectional shape of the aluminium alloy groove body are as follows: top is rectangular recess shape, and lower part is inverted triangle shape grid.Remaining is the same as implementation
Example 1.
Consolidation effect:
One, force analysis is carried out to the special-shaped bracing means of beams of concrete, reinforcing effect is carried out using the small example of 10m long T beam
Fruit assessment, establishes structural finite element model using ANSYS finite element software.
(1) material property
Concrete uses C30, density 2710kg/m3, Poisson's ratio 0.3, elasticity modulus 30GPa；
Aluminium alloy is 6061-T6, with a thickness of 1cm, density 2710kg/m3, Poisson's ratio 0.3, elasticity modulus 72GPa.
(2) the way of restraint
It is constrained in the form of simply supported beam.
(3) load
Dead load, acceleration of gravity 9.8m/s2。
(2) model screenshot: as shown in Figure 4.
Two, calculated result
(1) front and back self-vibration characteristic comparison is reinforced
It reinforces front and back self-vibration characteristic calculated result and is shown in Table 1, as can be seen from Table 1, the natural frequency of vibration of T beam obtains after reinforcing
The rigidity of different degrees of raising, i.e. T beam is improved.
Table 1 reinforces front and back self-vibration characteristic calculated result comparison
| Serial number | Natural frequency of vibration order | The natural frequency of vibration before reinforcing | The natural frequency of vibration after reinforcing | Variable quantity |
| 1 | Single order | 11.145 | 11.801 | 0.656 |
| 2 | Second order | 22.455 | 22.932 | 0.477 |
| 3 | Three ranks | 28.259 | 30.451 | 2.192 |
| 4 | Quadravalence | 34.296 | 37.481 | 3.185 |
| 5 | Five ranks | 57.043 | 60.517 | 3.474 |
| 6 | Six ranks | 63.277 | 64.901 | 1.624 |
| 7 | Seven ranks | 64.959 | 66.383 | 1.424 |
| 8 | Eight ranks | 76.654 | 76.748 | 0.094 |
(2) front and back amount of deflection comparison is reinforced
Under gravity load effect, static analysis is carried out, the results are shown in Table 2, as can be seen from Table 2, amount of deflection improves after reinforcing
10%, it is practical to reinforce, increase and decrease and the aluminium alloy of corresponding number of grid can be carried out according to bearing power increase requirement is reinforced
The increase and decrease of plate thickness.
Table 2 reinforces front and back amount of deflection and calculates Comparative result
(3) front and back stress comparison is reinforced
Under gravity load effect, static analysis is carried out, the results are shown in Table 3, T beam bottom portion after being reinforced it can be seen from table 2-3
The longitudinal tension stress of concrete obtains different degrees of reduction, average in 20% or so, practical reinforcing, can be held according to reinforcing
It carries power and improves requirement, carry out the increase and decrease of corresponding number of grid and the increase and decrease of aluminium alloy plate thickness.
Table 3 reinforces front and back stress calculating results comparison
Claims (4)
1. a kind of special-shaped bracing means of beams of concrete, which is characterized in that the bracing means is the aluminum alloy trough for having a groove
Body；
The cross sectional shape of the aluminium alloy groove body is abnormity, which is fixedly attached to beams of concrete bottom outer；It is described
The outer surface of groove inner surface and beams of concrete bottom is bolted beams of concrete by structure glue connection, the side wall of groove；
The cross sectional shape of the aluminium alloy groove body are as follows: top is rectangular recess shape, and lower part is irpiciform；
Or the cross sectional shape of the aluminium alloy groove body are as follows: top is rectangular recess shape, and lower part is four square grids side by side,
In each side's grid bottom it is jagged；
Or the cross sectional shape of the aluminium alloy groove body are as follows: top is rectangular recess shape, and lower part is four square grids side by side, bottom
Portion's closing；
Or the cross sectional shape of the aluminium alloy groove body are as follows: top is rectangular recess shape, and lower part is the splicing of multiple right angled triangles
At block plaid；
Or the cross sectional shape of the aluminium alloy groove body are as follows: top is rectangular recess shape, and lower part is inverted triangle shape grid.
2. a kind of construction method of the special-shaped bracing means of beams of concrete as described in claim 1, which is characterized in that step is such as
Under:
1. concrete beam strengthening area is surface-treated:
The surface layer mortar for cutting concrete beam strengthening area forms smooth rough surface and cleans out, again with toluene or industry third
Ketone wipes stabilization zone surface；
2. drilling: in the two sides of beams of concrete, the bolt corresponding to bracing means connects drilling；Injecting glue is bored on bracing means
Hole；
3. installing bracing means:
The bracing means is processed according to design requirement, the groove inner surface of bracing means is subjected to derusting and coarse processing and clear
Reason is clean；Bracing means is covered outside beams of concrete bottom and is bolted, the groove inner surface and beams of concrete of bracing means
There are the gaps of 1~3mm between outer surface；
4. edge sealing: exhaust pipe is inserted into bracing means apical margin, with closing glue closed reinforcement device edge；
5. preparing structure glue；
6. perfusion: structure glue being filled into the gap of bracing means and beams of concrete by hole for injecting glue, until exhaust pipe has glue
Liquid stream goes out.
3. a kind of construction method of the special-shaped bracing means of beams of concrete as claimed in claim 2, which is characterized in that the step
Suddenly 1. in cut the surface layer mortar of concrete beam strengthening area 2~5mm thickness.
4. a kind of construction method of the special-shaped bracing means of beams of concrete as claimed in claim 2, which is characterized in that the step
Suddenly structure glue pump 6. is perfused with the pressure of 0.2~0.4MPa from hole for injecting glue.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001288899A (en) * | 2000-04-04 | 2001-10-19 | Kajima Corp | Cross section repairing method for structural member |
| CN201771201U (en) * | 2010-05-24 | 2011-03-23 | 深圳大学 | Reinforced concrete structure |
| JP2014074299A (en) * | 2012-10-04 | 2014-04-24 | Ohbayashi Corp | Method for evaluating effect of shear reinforcement of concrete beam with opening |
| CN204252572U (en) * | 2014-11-27 | 2015-04-08 | 苏州中固建筑科技有限公司 | A kind of ruggedized construction of outer side bar concrete structure |
| CN104863379A (en) * | 2015-05-11 | 2015-08-26 | 河南理工大学 | Strengthening member for special reinforced concrete beam, effective strengthening method and application thereof |
| CN206091359U (en) * | 2016-10-12 | 2017-04-12 | 广西大学 | Concrete beam's special -shaped reinforcing apparatus |
-
2016
- 2016-10-12 CN CN201610891583.0A patent/CN106437191B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001288899A (en) * | 2000-04-04 | 2001-10-19 | Kajima Corp | Cross section repairing method for structural member |
| CN201771201U (en) * | 2010-05-24 | 2011-03-23 | 深圳大学 | Reinforced concrete structure |
| JP2014074299A (en) * | 2012-10-04 | 2014-04-24 | Ohbayashi Corp | Method for evaluating effect of shear reinforcement of concrete beam with opening |
| CN204252572U (en) * | 2014-11-27 | 2015-04-08 | 苏州中固建筑科技有限公司 | A kind of ruggedized construction of outer side bar concrete structure |
| CN104863379A (en) * | 2015-05-11 | 2015-08-26 | 河南理工大学 | Strengthening member for special reinforced concrete beam, effective strengthening method and application thereof |
| CN206091359U (en) * | 2016-10-12 | 2017-04-12 | 广西大学 | Concrete beam's special -shaped reinforcing apparatus |
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