CN115749342A - Bank protection crack defect repairing process under surge and impact load - Google Patents
Bank protection crack defect repairing process under surge and impact load Download PDFInfo
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- CN115749342A CN115749342A CN202211241532.5A CN202211241532A CN115749342A CN 115749342 A CN115749342 A CN 115749342A CN 202211241532 A CN202211241532 A CN 202211241532A CN 115749342 A CN115749342 A CN 115749342A
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Abstract
The invention provides a bank protection crack defect repairing process under surge and impact load, which comprises the following steps: step one, preparing magnetic concrete; secondly, detecting the width, depth, length and location of the crack, and performing surface debridement; placing a fiber net at the hole of the crack, wherein the fiber net has magnetism, the end part of the magnetic anchor rod adsorbs magnetic concrete, and the fiber net is pushed into the hole of the crack through the magnetic anchor rod so as to be attached to the inner wall of the hole of the crack; and step four, placing the concrete pouring guide pipe on one side of the magnetic anchor rod, pouring the magnetic concrete, and simultaneously adjusting the magnetic strength of the magnetic anchor rod to cause magnetic field oscillation. The process enables the magnetic concrete to gather at the crack defect position, improves the shearing resistance of the magnetic concrete, and fully fills the gap.
Description
Technical Field
The invention relates to the field of crack repair, in particular to a bank protection crack defect repair process under surge and impact load.
Background
Traditional concrete has self shortcoming, and some buildings are under the load effect, and concrete itself also can expend with heat and contract with cold under extreme weather effect, because the inhomogeneous settlement of ground, some factors of construction process quality all can cause the crack. The traditional crack repairing scheme has the defects that the surface repairing method and the local repairing method are complex in process and long in time, and new cracks can appear after a certain time. The viscosity of the concrete can not be regulated and controlled in real time, the durability is poor, the concrete is easy to scour and run off, the concrete water body can not be fully discharged, and the shearing resistance and the segregation of the concrete are poor.
The surge is a common ocean dynamic action phenomenon, impact load can be generated under the action of the surge, and when the surge is transmitted into a shallow water area from a deep water area, the surge is affected by regional terrain change, so that the phenomena of shallowness, shore protection breakage and the like can occur, and the phenomena are the key point in ocean dynamic research. The ocean terrain is different from common slowly-varying terrain, the water depth changes violently, and the characteristics of strong nonlinear change are realized when the surge interacts with the ocean terrain. Causing huge damage to the revetment under the surge and impact load. The traditional concrete material repair has the defects of serious concrete loss under the action of surge and impact load, prolonged construction period, high cost, complex concrete construction process, poor effect, difficult injection of micro-crack concrete and high plugging difficulty. The concrete has the defects of insufficient shear resistance, easy segregation and the like. New cracks may appear over time. The viscosity of the concrete can not be regulated and controlled in real time, the durability is poor, the concrete is easy to be washed away and lost, and the water body of the concrete can not be fully discharged.
CN113250483A discloses a magnetic force-based embedded and prefabricated magnetic attraction end-oriented device and method for repairing a crack of a building, which improve the crack filling effect of the building through magnetic concrete, but the prior art does not disclose a magnetic concrete repairing process under the action of an impact load.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a bank protection crack defect repairing process under surge and impact load, so that magnetic concrete is gathered at the crack defect position, the shear resistance of the magnetic concrete is improved, and all gaps are fully filled.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a bank protection crack defect repairing process under surge and impact load comprises the following steps:
step one, preparing magnetic concrete;
secondly, detecting the width, depth length and positioning of the crack, and performing surface debridement;
placing a fiber net at the hole of the crack, wherein the fiber net has magnetism, the end part of the magnetic anchor rod adsorbs magnetic concrete, and the fiber net is pushed into the hole of the crack through the magnetic anchor rod so as to be attached to the inner wall of the hole of the crack;
and step four, placing the concrete pouring conduit on one side of the magnetic anchor rod, pouring the magnetic concrete, and simultaneously adjusting the magnetic strength of the magnetic anchor rod to cause magnetic field oscillation.
In a preferred embodiment, in the first step, the magnetic concrete is prepared as follows:
s1, filling cement and a water reducing agent into a container, stirring to uniformly mix the cement and the water reducing agent, and then adding water to enable the cement and the water to generate a hydration reaction;
s2, adding epoxy resin into a container filled with magnetic powder, stirring and mixing, then adding a flocculating agent and iron sand, and stirring fully;
and S3, mixing the slurry prepared in the S1 with the slurry prepared in the S2, and then adding the aggregate to stir.
In a preferable scheme, in the S1, the mass percentage of the water reducing agent is 0.5%.
In a preferred scheme, in the step S2, the mass ratio of the magnetic powder, the epoxy resin, the flocculating agent and the iron sand is 2:1:1:6.
in a preferred embodiment, in S3, the ratio of the slurry prepared in S1 to the slurry prepared in S2 is 1.
In the preferable scheme, in S3, the aggregate is selected from ceramsite, foam, waste concrete, iron ore or slag and crushed stone.
In a preferred scheme, in the third step, the magnetic anchor rod comprises a hollow anchor rod, and an electromagnet is arranged in a hollow cavity of the hollow anchor rod.
The bank protection crack defect repairing process under surge and impact load has the following beneficial effects:
1. the traditional construction method needs formwork support, steel bar binding and concrete pouring, needs a large amount of materials and labor cost, and the concrete is easy to wash during underwater construction, the compactness and the fluidity of the concrete cannot be guaranteed, and the shearing resistance of the concrete is insufficient. The magnetic concrete preparation method does not need a large number of templates and reinforcing steel bars, the construction process is simple, the viscosity of the magnetic concrete can be regulated and controlled in real time through the adjustment of the proportion of the magnetic concrete and the size of a magnetic field, and the magnetic concrete is resistant to dispersion, erosion and rapid condensation in a water environment and has larger shear resistance.
2. The magnetic anchor rod adsorbs the magnetic concrete end, and the magnetic anchor rod adjusts the magnetic strength thereof to cause the magnetic field to vibrate, and the drainage and the exhaust of the pouring process are completed, so that the compact effect is achieved. The strength of the magnetic field can be controlled when the magnetic concrete is poured, the magnetic concrete is gathered at the magnetic concrete pouring port, the shearing resistance of the magnetic concrete is improved, the magnetic field intensity is reduced, the fluidity of the magnetic concrete is increased, all pores are fully filled, the magnetic concrete is adsorbed by arranging the fiber net with magnetism, and the magnetic concrete can be fully filled in the pores.
3. The magnetic concrete can be filled in a counter-gravity mode, the content of magnetic substances is increased by adjusting the proportion of the magnetic concrete, the magnetic adsorption effect is enhanced, the gravity of the magnetic concrete is overcome, the counter-gravity magnetic concrete is realized, and the underwater construction environment can resist a high water head.
4. The electromagnet is arranged in the hollow anchor rod and is positioned in the center of the hollow anchor rod, the current magnetic field intensity is gradually increased by adjusting the magnetic field intensity of the electromagnet, magnetic concrete is injected into the pouring guide pipe, and the magnetic concrete is gathered around the hollow anchor rod under the action of the magnetic field.
Drawings
The invention is further illustrated with reference to the accompanying drawings and examples:
FIG. 1 is a schematic structural view of a magnetic anchor;
FIG. 2 is a process diagram of a bank protection crack defect repairing process;
FIG. 3 is a schematic view of the magnetic field influencing induction lines of the magnetic anchor;
FIG. 4 is a graph showing the variation of the adsorption diameter under different magnetic field strengths;
FIG. 5 is a schematic view of a structure of the diameter of the magnetic concrete;
FIG. 6 is a schematic view of the self-polymerization capability of the magnetically self-polymerized slurry;
FIG. 7 is a graph showing a comparison of the filling areas of magnetically self-polymerized slurry and normal slurry;
FIG. 8 is a graph of the change in void area and void count for different magnetic field strengths;
in the figure: the magnetic anchor rod comprises an electromagnet 1, a hollow anchor rod 2, a fiber net 3, a hole 4, a pouring conduit 5, magnetic concrete 6, magnetic induction lines 7, a magnetic anchor rod 8, an effective magnetization area 9 and an unmagnetized area 10.
Detailed Description
Example 1: a bank protection crack defect repairing process under surge and impact load comprises the following steps:
step one, preparing magnetic concrete, wherein the preparation operation is as follows:
s1, filling cement and a water reducing agent into a container for stirring, wherein the mass ratio of the water reducing agent is 0.5%, the water reducing agent is a naphthalene-based high-efficiency water reducing agent, quickly stirring to uniformly mix the water reducing agent and the naphthalene-based high-efficiency water reducing agent, and then adding water to enable the cement and the water to generate hydration reaction. The water reducing agent is beneficial to improving the fluidity of the magnetic concrete, so that the structure is more stable, the strength is improved, and meanwhile, the cement consumption can be saved under the condition of not changing the strength of the magnetic concrete.
S2, adding epoxy resin into a container filled with magnetic powder, stirring and mixing, wherein oily epoxy resin can be used for underwater crack repair, water-based epoxy resin can be used for pavement crack repair, and epoxy resin magnetic concrete can enable the crack filling area to be high under the induction of magnetic force.
The epoxy resin and the magnetic powder are mixed, so that the magnetic powder is fully wrapped by the epoxy resin, the contact between the magnetic powder and the outside is reduced, and the durability of the magnetic concrete is enhanced. The magnetic particles need to be uniformly suspended in the magnetic concrete, and the magnetic concrete is driven to controllably flow under the action of magnetic force, so that the magnetic particles can be prevented from being separated out under the induction of the magnetic force.
Then adding a flocculating agent and iron sand, and fully stirring, wherein the mass ratio of the magnetic powder to the epoxy resin to the flocculating agent to the iron sand is 2:1:1:6.
and S3, mixing the slurry prepared in the S1 with the slurry prepared in the S2, fully mixing the two slurries together, rapidly stirring and vibrating to force the fluidity of the mixed slurry to be increased, discharging air and redundant moisture in the mixed magnetic concrete, being beneficial to reducing the porosity of the magnetic concrete and preventing honeycomb holes from occurring. And then adding aggregate to stir, wherein the ratio of the slurry prepared in the step S1 to the slurry prepared in the step S2 is 1:2.
the aggregate is made of ceramsite or foam or waste concrete or iron ore or slag macadam.
When the aggregate is foam, the weight is light, and a large magnetic force can be generated under the action of a magnetic field without overcoming the dead weight to drive the surrounding magnetic concrete to move together. The iron ore, the broken iron blocks and the iron slag are used as aggregates, the magnetic concrete can be magnetized, the aggregates are tightly adsorbed to the periphery of the hollow anchor rod, and the aggregates are not easy to lose under the action of sea wave load. The ceramsite is used as a coarse aggregate, and the roundness is large, so that the fluidity of the magnetic concrete can be increased, and the compactness of the magnetic concrete is better. The slag macadam is used as aggregate, the magnetic concrete has good corrosion resistance, the aggregate is easy to obtain, and the price is low.
The shape of the aggregate design can be designed to be round, polygonal, concave polygon and the like. The larger the specific surface area of the aggregate is, the more magnetic concrete slurry can be adsorbed on the surface, and the magnetic concrete directionally moves under the action of a magnetic field.
And secondly, detecting the width, depth length and positioning of the crack, and performing surface debridement.
Step three, as shown in fig. 2, a fiber net is placed at the hole of the crack, the fiber net has magnetism, the end part of the magnetic anchor rod adsorbs magnetic concrete and gathers at the periphery of the magnetic anchor rod under the action of a magnetic field, and the diameter of the magnetic anchor rod is d B The diameter of the magnetic concrete is d, and the height of the magnetic concrete is h, as shown in fig. 5.
In going into fissured hole with the fibre web top through the magnetism stock, put into the hole with other stocks according to certain spacing distance, the interval distance is confirmed according to magnetism stock magnetism influence scope, and the hole is all pushed into to the fibre web, makes and better laminating with the pore wall.
Preferably, as shown in fig. 1, the magnetic anchor rod includes a hollow anchor rod, an electromagnet is disposed in a hollow cavity of the hollow anchor rod, and the electromagnet is connected to the controllable switch through a wire. Through setting up the electro-magnet, magnetic force can be adjusted between magnetic concrete and the cavity stock, can accomplish the drainage exhaust to its pouring process by the magnetic field oscillation frequency or the amplitude of attraction end when annotating magnetic concrete stiff end and pouring, reachs closely knit effect. The viscosity of the magnetic concrete can be regulated and controlled in real time, and the shear strength of the magnetic concrete is improved.
And step four, placing the concrete pouring guide pipe on one side of the magnetic anchor rod, pouring magnetic concrete, adjusting the magnetic strength of the magnetic anchor rod to cause magnetic field oscillation, and adsorbing the magnetic concrete by the fiber net to fill the hole wall pores to ensure that the magnetic concrete fills the holes.
As shown in fig. 3 and 6, the magnetic anchor rod adsorbs the magnetic concrete end, and the magnetic anchor rod adjusts the magnetic strength thereof to cause the magnetic field to vibrate, so as to complete the drainage and exhaust in the casting process, thereby achieving the effect of compaction. The strength of the magnetic field can be controlled while the magnetic concrete is poured, so that the magnetic concrete is gathered at the opening of the magnetic concrete, the shearing resistance of the magnetic concrete is improved, the magnetic field intensity is reduced, the fluidity of the magnetic concrete is increased, and all pores are fully filled.
The magnetic concrete can be filled in a counter-gravity mode, the content of magnetic substances is increased by adjusting the proportion of the magnetic concrete, the magnetic adsorption effect is enhanced, the gravity of the magnetic concrete is overcome, the counter-gravity magnetic concrete is realized, and the underwater construction environment can resist a high water head.
In the oily epoxy resin test, a magnetic powder doping amount of the oily epoxy resin test is 30%, and the diameter d of the magnetic concrete adsorbed under different magnetic field strengths is measured, with the change trend of the diameter as shown in fig. 4. Under the condition of the same magnetic powder content, the diameter of self-aggregation of the adsorption is gradually increased along with the increase of the magnetic field intensity.
The concrete structure is 30cm long and 20cm wide. The filling areas of the magnetic self-polymerization grout and the common grout are calculated by adopting an image seepage area digital self-recognition technology, and as shown in figure 7, the filling area of the magnetic self-polymerization grout is 549.12cm 2 The filling area of the common slurry is 232.98cm 2 The filling rate can be calculated by calculating the filling area of the slurry. The calculation shows that the local filling rate of the magnetic self-polymerization slurry is 91.5 percent, the local filling rate of the common slurry is 38.8 percent, and the lateral filling rate of the magnetic self-polymerization slurry is improved by more than 1 time compared with the common slurry.
When the magnetic field strength is increased from 400GS to 6000GS, the reduction rate of the pore area reaches 77.6%, and the reduction rate of the number of pores reaches 76.8%, as shown in FIG. 8.
Example 2: the difference from the embodiment 1 is that in the second step, for large-scale defects, the gravity flow type magnetic concrete is firstly adopted for filling, then secondary detection is carried out on the defects which cannot be completed by the gravity flow type magnetic concrete for repairing, drilling of a corresponding number of embedded holes is carried out at specific positions in the cavity according to the embedded number in the repairing scheme, and then the subsequent operations of the third step, the fourth step are carried out on the embedded holes.
Example 3: compared with the embodiment 1, the difference is that different repairing modes are adopted for cavities with different elutriation depths on the bank protection structure, and the gravity flow type magnetic concrete is firstly adopted to fill in the area with smaller gradient; in the region with larger gradient, a free section extending out of the slope is sleeved with a film bag, a building block is placed into the film bag for treatment, the treated fixed end of the magnetic concrete is arranged in an embedding hole, and meanwhile, the magnetic concrete is injected into the film bag for embedding. After the strength is generated, a certain number of test blocks are taken out at the fixed end of the magnetic concrete to carry out cavity primary filling so as to reduce the use cost of the magnetic concrete, and after the primary filling is completed, the operation of the following steps three-four is carried out on the cavity so that the magnetic concrete can fully fill the test block cracks and other small cavities which are not filled yet.
Example 4: for larger-volume elutriation damage, according to the position and the shape of the damage, one or more materials such as block stones, bagged sand filled with certain cement paste, prefabricated bagged concrete and the like can be adopted for initial filling, a cover net is used for covering the initial filling, the fixed cover net is positioned and poured by combining the embedding and fixing technology of the fixed end of the magnetic concrete, finally, the operation of the following steps of three to four is carried out at the proper position around the cover net, the gap between the initial filling is filled, and the integrity of the embedded solid and the repaired object is improved.
Claims (7)
1. A bank protection crack defect repairing process under surge and impact load is characterized by comprising the following steps:
step one, preparing magnetic concrete;
secondly, detecting the width, depth length and positioning of the crack, and performing surface debridement;
placing a fiber net at the hole of the crack, wherein the fiber net has magnetism, the end part of the magnetic anchor rod adsorbs magnetic concrete, and the fiber net is pushed into the hole of the crack through the magnetic anchor rod so as to be attached to the inner wall of the hole of the crack;
and step four, placing the concrete pouring conduit on one side of the magnetic anchor rod, pouring the magnetic concrete, and simultaneously adjusting the magnetic strength of the magnetic anchor rod to cause magnetic field oscillation.
2. The bank protection crack defect repairing process under surge and impact load according to claim 1, wherein in the first step, the magnetic concrete preparation operation is as follows:
s1, filling cement and a water reducing agent into a container, stirring to uniformly mix the cement and the water reducing agent, and then adding water to enable the cement and the water to generate a hydration reaction;
s2, adding epoxy resin into a container filled with magnetic powder, stirring and mixing, then adding a flocculating agent and iron sand, and stirring fully;
and S3, mixing the slurry prepared in the S1 with the slurry prepared in the S2, and then adding the aggregate to stir.
3. The revetment crack defect repair process under surge and impact load according to claim 2, wherein in S1, the mass ratio of the water reducing agent is 0.5%.
4. The revetment crack defect repair process under surge and impact load according to claim 2, wherein in the step S2, the mass ratio of magnetic powder, epoxy resin, flocculant and iron sand is 2:1:1:6.
5. the revetment crack defect repair process under surge and impact load according to claim 2, wherein the ratio of the slurry prepared in S3 and the slurry prepared in S2 is 1:2.
6. the revetment crack defect repair process under surge and impact load according to claim 2, wherein in S3, the aggregate is selected from ceramsite, foam, waste concrete, iron ore or crushed slag.
7. The bank protection crack defect repairing process under surge and impact load according to claim 1, wherein in the third step, the magnetic anchor rod comprises a hollow anchor rod, and an electromagnet is arranged in a hollow cavity of the hollow anchor rod.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116332576A (en) * | 2023-03-14 | 2023-06-27 | 三峡大学 | Preparation of magnetic concrete and crack repairing process thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116332576A (en) * | 2023-03-14 | 2023-06-27 | 三峡大学 | Preparation of magnetic concrete and crack repairing process thereof |
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