CN109779370A - A kind of underwater antiknock composite protection structure and its construction method based on hollow glass micropearl - Google Patents
A kind of underwater antiknock composite protection structure and its construction method based on hollow glass micropearl Download PDFInfo
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- CN109779370A CN109779370A CN201910141107.0A CN201910141107A CN109779370A CN 109779370 A CN109779370 A CN 109779370A CN 201910141107 A CN201910141107 A CN 201910141107A CN 109779370 A CN109779370 A CN 109779370A
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Abstract
The invention discloses a kind of underwater antiknock composite protection structure and its construction method based on hollow glass micropearl.The composite protection structure is formed by being arranged in the basalt fibre high-strength concrete layer for building surface cast-in-place construction of paddling and mixing hollow glass micropearl concrete layer.Short distance underwater explosion is born using the superhigh intensity for mixing basalt fibre Reactive Powder Concrete to hit, and solves the problems, such as reinforcing bar durability decline after by the corrosion of water body intermediate ion in main structure；Simultaneously using the wave impedance mismatch properties of sealing gas and surrounding medium in hollow glass micropearl, realizes the reflection of underwater blast wave, slow down the propagation of stress wave in the structure.The composite protection structure effectively prevent destruction of the explosion wave to building of paddling by cutting energy step by step.In addition, composite protection structure corrosion resistance, impermeability, the durability etc. are functional, the underwater antiknock protection of all kinds of buildings of paddling can be widely used for.
Description
Technical field
The invention belongs to aniknock technology field, the underwater antiknock protection field for the building that is related to paddling, and in particular to a kind of
Underwater antiknock composite protection structure and its construction method based on hollow glass micropearl.Antiknock suitable for general structure is protected,
Be particularly suitable for paddling the antiknock protection of building.
Background technique
Building of paddling not only includes the big library of high dam, river-spanning bridge, takes water diversion project, further includes naval port harbour, submarine hole
Library, all sea island reefs etc., it is closely bound up with livehood economy, the national defense safety of country.In recent years, water environment complicates, paddles
The quantity of the aging of building material itself and destruction, underwater demolition engineering increasingly increases, international relations anxiety, the attack of terrorism
Constantly occur with accidental explosion event, occurs the great impaired accident of various heavy constructions both at home and abroad, cause huge safety
Problem and economic loss.
A variety of be directed to is proposed in order to improve security performances, the domestic and foreign scholars such as the shock resistance of heavy construction, antiknock, wear-resistant
Safeguard procedures under the conditions of aerial and penetration and explosion, such as foamed material (foam concrete, foamed aluminium, foamed plastics, foamed ceramics
Deng), blast wall, the super high strength concrete based on fiber, honeycomb sandwich construction etc..However for building of paddling, there is protection
The problems such as installation, erosion, the infiltration of measure are intake, it is difficult to directly use underwater antiknock protection.As foam concrete is placed on water
When lower, due to the infiltration of seawater, hole will be filled up by water, lose slicing protective performance, and foam concrete intensity it is low be difficult to
Anti- short distance underwater explosion strike.
Basalt fibre is basalt building stones after 1450~1500 DEG C of meltings, by continuous fine made of high speed pulling
Dimension, can within the scope of -269~700 DEG C continuous work, there are the spies such as tensile strength is higher, corrosion-resistant, high temperature resistant, cracking resistance
Point, be widely used in work China Democratic National Construction Association, bridge, road engineering Crack Control in.
Hollow glass micropearl is a kind of micron order new lightweight material, and density is in 0.2~0.6g/cm3, partial size is 2~130
Between μm, have the characteristics that thermal coefficient is low, compression strength is high, good fluidity, good dispersion.However at present to based on hollow glass
Its macroscopic property is focused in the research of the cement-base composite material of microballon mostly, if marquis's wind et al. is to high-performance hollow glass micropearl
The research of cement-base composite material compression strength；Wu Yongjie et al. proposes to prepare using high-performance hollow glass micropearl and haydite light
Matter high-strength concrete；Influence of the Wang Qing et al. to hollow glass micropearl to foam concrete performance is studied.It is rare about
The research of hollow glass micropearl resistance underwater blast wave.
However, the effect that hollow glass micropearl resists underwater blast wave is extremely significant.When shock motion to two media
When interface, it may occur that reflection and transmission phenomenon, and the ratio between wave impedance of two media shock wave is propagated with important shadow
It rings.Since the wave impedance ratio water of air in hollow glass micropearl is much smaller, when underwater blast wave travels to the boundary of air and water
When face, underwater blast wave will mainly reflect at dielectric interface, and transmission coefficient is smaller, only small part energy transmission
To in air dielectric, underwater blast wave can be effectively buffered.
Summary of the invention
Technical problems based on background technology, the underwater antiknock based on hollow glass micropearl that the present invention provides a kind of
Composite protection structure and its construction method, to solve the problems, such as that underwater antiknock effect is bad in the prior art.
For the above-mentioned technical deficiency of solution, reach technical purpose and effect, the specific technical solution of the present invention is as follows:
A kind of underwater antiknock composite protection structure based on hollow glass micropearl, it is characterised in that: the composite protection structure
Shock wave by being arranged in building surface of paddling resists layer and shock reflection layer forms, and it is at least that the shock wave, which resists layer,
One layer is located at external concrete layer, and the shock reflection layer is at least one layer of internally positioned and doped hollow glass microballoon
Concrete layer.The underwater antiknock composite protection structure is in building surface arrangement of paddling.By cutting energy step by step, it effectively prevent
Destruction of the explosion wave to building of paddling.
As an improvement, the shock reflection layer is the Reactive Powder Concrete of doped hollow glass microballoon.Using hollow
The wave impedance mismatch properties of sealing gas and surrounding medium, realize the reflection of underwater blast wave, slow down and answer in glass microballoon
The propagation of Reeb in the structure.Structure is increased substantially to the anti-detonation of underwater blast wave.Paddle the second level of building
Antiknock protection.
As an improvement, it is the Reactive Powder Concrete for adulterating basalt fibre that the shock wave, which resists layer,.It is profound using mixing
Concrete superelevation epistasis after military rock fiber can make structure bear underwater short distance or contact explositions strike, can effectively solve simultaneously
It paddles the problem of armored concrete is caused durability to decline by the corrosion of water body intermediate ion in building.Paddle the one of building
Grade antiknock protection.
As an improvement, the Reactive Powder Concrete adds water to mix by portland cement, quartz sand, silicon powder and high efficiency water reducing agent
Composition is solidified after conjunction.
As an improvement, the shock wave, which is resisted, mixes the volume fraction of basalt fibre as 2%-12% in layer, basalt is fine
Dimension length is 12~20mm.
As an improvement, the high efficiency water reducing agent uses high-efficiency water-reducing agent of poly-carboxylic acid.
As an improvement, hollow glass micropearl is mixed for replacing this layer of reactive powder in equal volume in the shock reflection layer
Quartz sand in solidifying soil, the hollow glass micropearl are 15%-50% to the replacement rate of quartz sand.
As an improvement, the hollow glass micropearl main component is SiO2And Al2O3, there is filling gas CO in inside2, true
Density is 0.32~0.6g/cm3, compression strength >=25MPa, partial size is 2~120 μm.
As an improvement, the portland cement, quartz sand, silicon powder and high efficiency water reducing agent mass fraction range be followed successively by
40-60 parts, 50-80 parts, 10-20 parts, 1-3 parts.
As an improvement, volume fraction, hollow glass micropearl that the basalt fibre in the composite protection structure mixes are selected
Concrete model resists layer and shock reflection layer point instead of the ratio of quartz sand, shock wave in Reactive Powder Concrete with isometric
Other thickness should be determined according to factors such as security level, body size, the water quality geological conditions of different buildings of paddling.
A kind of construction method of above-mentioned underwater antiknock composite protection structure, which comprises the following steps:
Step 1, while gravity dam Roadway Design, design the composite protection structure in upstream face, reserve respectively
Shock wave resists the thickness D1 of layer and the thickness D2 of shock reflection layer out；
Step 2 builds the template that casting shock wave resists layer and shock reflection layer；
Step 3 constructs the composite protection structure and the gravity dam main structure same period using cast in situs mode, pours first
Infuse simultaneously curing concrete gravity dam；
Step 4 is poured and conserves shock reflection layer, when casting, mixes hollow glass micropearl in shock reflection layer
Quartz sand is replaced in equal volume；
Step 5 is poured and conserves shock wave and resists layer, when casting, resists in layer in shock wave and mixes basalt fibre, supports
After shield, that is, complete the construction of underwater antiknock composite protection structure.
Compared with prior art, the method have the advantages that:
(1) by basalt fibre in conjunction with Reactive Powder Concrete, the superelevation that impact strength can achieve 1+1 > 2 is strong
Effect, can be used as shock wave and resists layer, extremely efficient resists short distance underwater explosion or contact explositions strike, builds as paddling
Build the level-one antiknock protection of object.The building appearance layer in addition, this layer is paddled, utilizes the corrosion resistance of basalt fibre, energy
Corrosion of the chloride ion to reinforcing bar in building of paddling in water body is effectively reduced, the durability for building of paddling is increased substantially.
(2) hollow glass micropearl can not only apply to the heat preservation and insulation field of engineering, resist the effect of underwater blast wave
Fruit is also extremely significant.Sealing gas and surrounding medium work as explosion wave there are wave impedance mismatch properties in hollow glass micropearl
When traveling to two media interface, it may occur that reflection and transmission phenomenon.When shock wave, which fails, damages hollow glass micropearl,
Reflection wave energy offsets energy dissipating with the shock wave transmitted；When shock wave damages hollow glass micropearl, destructive process can also be carried out
Energy dissipating, to significantly slow down the propagation of stress wave in the structure.
(3) one aspect of the present invention is high-strength using the superhigh intensity progress level-one for the Reactive Powder Concrete for mixing basalt fibre
Degree resists antiknock, and it is anti-on the other hand to carry out secondary reflex wave using the sealing gas in the hollow glass micropearl mixed in concrete
It is quick-fried.It is achieved in energy dissipating step by step, effectively prevent destruction of the explosion wave to building of paddling.
(4) since the present invention is to reserve certain thickness simultaneous construction when paddling architecture construction to form, there is no protection
The installation of measure is complicated, connection is fragile, water body corrodes, permeates the problems such as water inlet, for the hollow of reflection stress wave in concrete
Glass microballoon will not be filled up by water, and slicing protective performance is ensured, can be directly used for underwater antiknock protection, and effective protection is large-scale
It paddles the long-term safety of building.
(5) present invention is beaten using the superhigh intensity receiving short distance underwater explosion for mixing basalt fibre Reactive Powder Concrete
It hits, and solves the problems, such as reinforcing bar durability decline after by the corrosion of water body intermediate ion in main structure；It is micro- using hollow glass simultaneously
The wave impedance mismatch properties of sealing gas and surrounding medium, realize the reflection of underwater blast wave in pearl, slow down stress wave and exist
Propagation in structure.The composite protection structure effectively prevent destruction of the explosion wave to building of paddling by cutting energy step by step.
In addition, composite protection structure corrosion resistance, impermeability, the durability etc. are functional, it can be widely used for all kinds of buildings of paddling
Underwater antiknock protection.
Detailed description of the invention
Fig. 1 is that the present invention is based on the underwater antiknock composite protection structure of hollow glass micropearl shocks under water
Under structural schematic diagram；
Fig. 2 is that the present invention is based on the underwater antiknock composite protection structure schematic diagrames of hollow glass micropearl；
Fig. 3 is that the present invention is based on the underwater antiknock composite protection structures of hollow glass micropearl to be applied to coagulation in embodiment 1
The schematic diagram of the underwater antiknock of native gravity dam；
In figure: 1- shock wave resistance layer, 2- shock reflection layer, 3- gravity dam main body, 4- water body, 5- underwater explosion source,
6- incident blast wave, 7- reflected shock wave, 8- basalt fibre, 9- hollow glass micropearl.
Specific embodiment
Present invention will be further described below with reference to the accompanying drawings and specific embodiments.
As shown in Fig. 2, a kind of underwater antiknock composite protection structure based on hollow glass micropearl, the composite protection structure by
The shock wave for being arranged in building surface of paddling resists layer 1 and shock reflection layer 2 forms, and it is position that the shock wave, which resists layer 1,
In the Reactive Powder Concrete of external doping basalt fibre 8, the shock reflection layer 2 is internally positioned and doping is empty
The Reactive Powder Concrete of heart glass microballoon 9, the Reactive Powder Concrete by portland cement, quartz sand, silicon powder and efficiently
Water-reducing agent solidifies composition after adding water to mix.
It is 2%-12%, 8 length of basalt fibre that the shock wave, which is resisted and mixes the volume fraction of basalt fibre 8 in layer 1,
For 12~20mm.The high efficiency water reducing agent uses high-efficiency water-reducing agent of poly-carboxylic acid.In the shock reflection layer 2, hollow glass is micro-
Pearl 9 is used to replace the quartz sand in this layer of Reactive Powder Concrete, replacement of the hollow glass micropearl 9 to quartz sand in equal volume
Rate is 15%-50%.
9 main component of hollow glass micropearl is SiO2And Al2O3, there is filling gas CO in inside2, real density is
0.32~0.6g/cm3, compression strength >=25MPa, partial size is 2~120 μm.
As a preference, the portland cement, quartz sand, silicon powder and high efficiency water reducing agent mass fraction range successively
It is 40-60 parts, 50-80 parts, 10-20 parts, 1-3 parts.
A kind of construction method of above-mentioned underwater antiknock composite protection structure, comprising the following steps:
Step 1, while gravity dam 3 engineering design of main body, design the composite protection structure in upstream face, reserve respectively
Shock wave resists the thickness D1 of layer 1 and the thickness D2 of shock reflection layer 2 out；
Step 2 builds the template that casting shock wave resists layer 1 and shock reflection layer 2；
Step 3 constructs the composite protection structure and the 3 structure same period of gravity dam main body using cast in situs mode, first
It is poured simultaneously curing concrete gravity dam；
Step 4 is poured and conserves shock reflection layer 2, and when casting, it is micro- that hollow glass is mixed in shock reflection layer 2
Pearl 9 replaces quartz sand in equal volume；
Step 5 is poured and conserves shock wave and resists layer 1, when casting, resists in layer 1 in shock wave and mixes basalt fibre
8, after maintenance, that is, complete the construction of underwater antiknock composite protection structure.
The composite protection structure should be in architecture construction phase synchronous construction of paddling, the volume that wherein basalt fibre 8 mixes
Rate, hollow glass micropearl 9 resist the thickness D1 of layer 1 instead of the ratio of quartz sand, shock wave in Reactive Powder Concrete in equal volume
Thickness D2 with shock reflection layer 2 is by factors such as the security level for building 3 of paddling, body size, water quality geological conditions
It determines.
To determine 8 volume volume of best proportion basalt fibre to reach excellent antiknock effect, as shown in Figure 1, making respectively
Make conventional concrete test specimen, Reactive Powder Concrete test specimen, incorporation 8 volume fraction of basalt fibre be 2%, 4%, 6%, 8%,
10% Reactive Powder Concrete test specimen, test specimen size are 500mm × 500mm × 100mm, carry out underwater explosion examination respectively
It tests: Reactive Powder Concrete test specimen is fixed on bracket, the explosive as underwater explosion source 5 is fixed on reactive powder coagulation
In water body in front of native test specimen center, the water surface is away from Reactive Powder Concrete test specimen top surface 1.5m, emulsion 11.5g, networking
Detonation.
Almost total cross-section demolishs conventional concrete test specimen when by underwater contact explosion；Reactive Powder Concrete test specimen exists
It is about the 60% of conventional concrete by section damage area when underwater contact explosion；Mixing 8 volume fraction of basalt fibre is
2%, section damage area rate is about when by underwater contact explosion for 4%, 6%, 8%, 10% Reactive Powder Concrete test specimen
Respectively 10%, 7%, 5%, 6%, 7%.
Therefore, the optimum adding quantity of pulverized that 8 volume fraction of basalt fibre is mixed in above-described embodiment is 6%.
To determine that best proportion hollow glass micropearl 9 reaches excellent antiknock effect to isometric replacement rate of quartz sand,
Make conventional concrete test specimen, Reactive Powder Concrete test specimen, incorporation hollow glass micropearl 9 respectively is to quartz sand replacement rate
15%, 20%, 25%, 30%, 35%, 40%, 50% Reactive Powder Concrete test specimen, test specimen size be 500mm ×
500mm × 100mm carries out Underwater Explosion test respectively: Reactive Powder Concrete test specimen is fixed on bracket, it will be as underwater
The explosive of explosive source 5 is fixed in the water body in front of Reactive Powder Concrete test specimen center, and the water surface is away from Reactive Powder Concrete
Test specimen top surface 1.5m, emulsion 11.5g, networked detonation.
Almost total cross-section demolishs conventional concrete test specimen when by underwater contact explosion；Reactive Powder Concrete test specimen exists
It is about the 60% of conventional concrete by section damage area when underwater contact explosion；Hollow glass micropearl 9 is mixed to quartz sand
The Reactive Powder Concrete test specimen that replacement rate is 15%, 20%, 25%, 30%, 35%, 40%, 50% is contacted under water
Explosion time section damage area rate is about respectively 7%, 6%, 4%, 6%, 7%, 8%, 10%.
Therefore, hollow glass micropearl 9 is mixed in above-described embodiment is 25% to the optimal of quartz sand replacement rate.
It should to the preparation of quartz sand replacement rate using 6% 8 volume fraction of incorporation basalt fibre and 25% hollow glass micropearl 9
The Reactive Powder Concrete test specimen of composite protection structure, part size are 500mm × 500mm × 100mm, are carried out respectively underwater quick-fried
Fried test: Reactive Powder Concrete test specimen is fixed on bracket, the explosive as underwater explosion source 5 is fixed on reactive powder
In water body in front of concrete sample center, water-filling, the water surface is away from Reactive Powder Concrete test specimen top surface 1.5m, emulsion
11.5g, networked detonation, test result show that the shock reflection layer 2 of internal layer is intact.
Embodiment 1:
As shown in figure 3, being applied to one for the 100m high concrete gravity dam built by the composite protection structure, specifically
Implementation steps are as follows:
While gravity dam 3 engineering design of main body, the composite protection structure is designed in upstream face, reserves impact respectively
Wave resists the thickness D1 (60cm) of layer 1 and the thickness D2 (40cm) of shock reflection layer 2.Pacify after making the template of the composite construction
Dress is constructed with the 3 structure same period of gravity dam main body using cast in situs mode.The main structure of dam and 2 phase of shock reflection layer
Neighbour, shock reflection layer 2 resist layer 1 outside for shock wave.
Above-mentioned shock wave resists layer 1 with ordinary portland cement, quartz sand, silicon powder, high efficiency water reducing agent, basalt fibre 8
For main raw material(s), the Reactive Powder Concrete of incorporation basalt fibre 8 is made.In every cube of concrete: normal silicate water
Mud (model P.O52.5) 750kg/m3；Quartz sand 1030kg/m3, silicon powder 225kg/m3, high efficiency water reducing agent 16kg/m3, water
190kg/m3, i.e. each component weight ratio are as follows: 1:1.373:0.3:0.021:0.253；88 length of basalt fibre is 12~20mm,
The volume fraction of incorporation be 6%, high efficiency water reducing agent use solid content for 20% high-efficiency water-reducing agent of poly-carboxylic acid.
Above-mentioned shock reflection layer 2 is with the high property of steel in ordinary portland cement, quartz sand, silicon powder, high efficiency water reducing agent, H60
Energy hollow glass micropearl 9 is main raw material(s), and the Reactive Powder Concrete based on hollow glass micropearl 9 is made.Normal silicate
Cement (model P.O 52.5) 750kg/m3；Quartz sand 772.5kg/m3, silicon powder 225kg/m3, high efficiency water reducing agent 16kg/m3, water
190kg/m3, i.e. each component weight ratio are as follows: 1:1.03:0.3:0.021:0.253；High efficiency water reducing agent uses solid content for 20%
High-efficiency water-reducing agent of poly-carboxylic acid.Wherein, hollow glass micropearl 9 is steel high-performance hollow glass micropearl in H60, steel high-performance in H60
Sealing gas is CO in hollow glass micropearl2, Average Particle Diameters are 40~80 μm, real density 0.6g/cm3, compression strength is
68.90MPa.Directly with hollow glass micropearl 9 in equal volume instead of the quartz sand in Reactive Powder Concrete, hollow glass micropearl 9
Volume ratio with quartz sand is 0.25:0.75.
During on-site construction, since concrete gravity dam, from inside to outside carry out main structure, shock reflection layer 2 with
Shock wave resist layer 1 the stone that puts in storage, close a position vibrate, hierarchical block pours and conserves.
Explosion-proof principle of the composite protection structure on this 100m high concrete gravity dam is as follows:
As shown in Figure 1, when explosive source is ignited under water, to all directions incident blast wave 6.Wherein, to concrete gravity
The shock wave that the incident blast wave 6 in dam direction touches the composite protection structure first resists layer 1；
Layer 1 is resisted for shock wave, since basalt fibre 8 is in conjunction with Reactive Powder Concrete, extexine shock resistance is strong
Degree can achieve the potent fruit of superelevation of 1+1 > 2, to carry out shock wave resistance.Incident blast wave 6 resists layer 1 by shock wave
Level-one energy dissipating effect, energy reduce, and are gradually passed to shock reflection layer 2.
Disappear due to the presence of hollow glass micropearl 9 using wave impedance mismatch principle for shock reflection layer 2
Can: incident blast wave 6 passes to the sealing gas encountered in hollow glass micropearl 9 from surrounding concrete medium, and wave impedance occurs and loses
Effector ligand.When incident blast wave 6 fails to damage hollow glass micropearl 9, sealed gas effect generates reflected shock wave 7, rises
It is acted on to energy dissipating；When incident blast wave 6 damages hollow glass micropearl 9, which can also carry out energy dissipating.Pass through impact
The second level energy dissipating of wave reflection layer 2 acts on, and significantly slows down the propagation of stress wave in the structure.
In the above-described embodiments, building is paddled by taking the concrete gravity dam in dam as an example.In the present invention, paddles and may be used also
Think other types.Such as large reservoir, river-spanning bridge, take water diversion project, naval port harbour, submarine cave depot, all sea island reefs etc..This
Invention can guarantee the underwater good capability of antidetonance of these engineerings by energy dissipating step by step.
Similarly, the tool of basalt fibre 8 mixes in the composite protection structure volume fraction, the selection of hollow glass micropearl 9
Figure number is with isometric instead of the ratio of quartz sand, shock wave resist floor 1 in Reactive Powder Concrete and shock reflection floor 2 divides
Other thickness should be determined according to factors such as security level, body size, the water quality geological conditions of different buildings of paddling, be not limited to
Specific value in upper embodiment.
The above, optimal specific embodiment only of the invention, is not intended to limit the present invention in any form,
Any simple modification, equivalent change and modification done according to the technical essence of the invention to the above example, still fall within
Within protection scope of the present invention.
Claims (10)
1. a kind of underwater antiknock composite protection structure based on hollow glass micropearl, it is characterised in that: the composite protection structure by
The shock wave for being arranged in building surface of paddling resists layer and shock reflection layer composition, and it is at least one that the shock wave, which resists layer,
Layer is located at external concrete layer, and the shock reflection layer is at least one layer of internally positioned and doped hollow glass microballoon
Concrete layer.
2. underwater antiknock composite protection structure as described in claim 1, it is characterised in that: the shock reflection layer is doping
The Reactive Powder Concrete of hollow glass micropearl.
3. underwater antiknock composite protection structure as claimed in claim 1 or 2, it is characterised in that: the shock wave resists layer and is
Adulterate the Reactive Powder Concrete of basalt fibre.
4. underwater antiknock composite protection structure as claimed in claim 3, it is characterised in that: the Reactive Powder Concrete is by silicon
Acid salt cement, quartz sand, silicon powder and high efficiency water reducing agent solidify composition after adding water to mix.
5. underwater antiknock composite protection structure as claimed in claim 4, it is characterised in that: the shock wave is resisted to be mixed in layer
The volume fraction of basalt fibre is 2%-12%, and basalt fibre length is 12~20mm.
6. underwater antiknock composite protection structure as claimed in claim 4, it is characterised in that: the high efficiency water reducing agent uses poly- carboxylic
Sour high efficiency water reducing agent.
7. underwater antiknock composite protection structure as claimed in claim 4, it is characterised in that: empty in the shock reflection layer
Heart glass microballoon is used to replace the quartz sand in this layer of Reactive Powder Concrete in equal volume, and the hollow glass micropearl is to quartz sand
Replacement rate be 15%-50%.
8. antiknock composite protection structure as claimed in claim 4 underwater, it is characterised in that: the hollow glass micropearl mainly at
Dividing is SiO2And Al2O3, there is filling gas CO in inside2, real density is 0.32~0.6g/cm3, compression strength >=25MPa, partial size
It is 2~120 μm.
9. antiknock composite protection structure as claimed in claim 4 underwater, it is characterised in that: the portland cement, quartz sand,
The mass fraction range of silicon powder and high efficiency water reducing agent is followed successively by 40-60 parts, 50-80 parts, 10-20 parts, 1-3 parts.
10. a kind of construction method of underwater antiknock composite protection structure as claimed in claim 4, which is characterized in that including following
Step:
Step 1, while gravity dam Roadway Design, design the composite protection structure in upstream face, reserve punching respectively
It hits wave and resists the thickness D1 of layer and the thickness D2 of shock reflection layer；
Step 2 builds the template that casting shock wave resists layer and shock reflection layer；
Step 3 constructs the composite protection structure and the gravity dam main structure same period using cast in situs mode, is poured first simultaneously
Curing concrete gravity dam；
Step 4 is poured and conserves shock reflection layer, and when casting, the bodies such as hollow glass micropearl are mixed in shock reflection layer
Product replaces quartz sand；
Step 5 is poured and conserves shock wave and resists layer, when casting, resists in layer in shock wave and mixes basalt fibre, conserves
Afterwards, that is, the construction of underwater antiknock composite protection structure is completed.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111795625A (en) * | 2020-07-27 | 2020-10-20 | 武汉大学 | Method and device for protecting shock waves in water of blasting excavation of seabed foundation pit |
| CN116007462A (en) * | 2023-02-15 | 2023-04-25 | 武汉大学 | Hole bottom buffering energy dissipation method for underwater blasting |
| CN116461645A (en) * | 2023-06-08 | 2023-07-21 | 华中科技大学 | Repeatable trans-scale solid-liquid composite energy-absorbing protective tank structure |
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