CN109797788A - A kind of reinforcement means for reinforcing underwater concrete structure using ultra-high performance concrete - Google Patents
A kind of reinforcement means for reinforcing underwater concrete structure using ultra-high performance concrete Download PDFInfo
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- CN109797788A CN109797788A CN201910082284.6A CN201910082284A CN109797788A CN 109797788 A CN109797788 A CN 109797788A CN 201910082284 A CN201910082284 A CN 201910082284A CN 109797788 A CN109797788 A CN 109797788A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention belongs to maintenance of concrete structure and reinforcement technique field, more particularly to a kind of reinforcement means using ultra-high performance concrete reinforcing underwater concrete structure, it is characterised in that specific reinforcement means comprises the step of: after stabilization zone removing surface, after which the basis cleaning of reinforced concrete structure, steel reinforcement cage are placed, template is installed, topple over demoulding after fast hard mortar, perfusion ultra-high performance concrete and maintenance under rubble and aggregate chips, priming petock.The present invention has many advantages, such as reinforcement means simplicity, and bearing capacity of concrete structure and durability significantly improve after reinforcing.
Description
Technical field
The invention belongs to maintenance of concrete structure and reinforcement technique field, and in particular to a kind of to be added using ultra-high performance concrete
The reinforcement means of concrete structure under solid water.
Background technique
Underwater concrete structure is subject to be damaged due to by reasons such as water flow erosion, harmful ion erosion and collisions, especially
It is that the infringement such as alternation of wetting and drying and Frozen-thawed cycled may also suffer, therefore its damage situations is even more serious, in turn for SEA LEVEL VARIATION area
Cause underwater concrete structural bearing capacity and durability to reduce, threatens the safe handling of upper part structure.Currently, for underwater mixed
The maintenance of solidifying soil damaged part reinforces the method mainly used as Enlargement of Section, and the means specifically used include cofferdam post-reinforcing
And the anti-dispersion coagulation local method of underwater grouting is reinforced, and although the former consolidation effect is preferable, long construction period and costly, and the latter
It needs to build the operation side of larger area, and the globality in order to guarantee reinforcement material and bridge pier, usually also needs to carry out
Underwater bar planting operation, technique is relatively complicated, and its consolidation effect by construction technology and anti-washout concrete performance influenced compared with
Greatly.
It is strong that ultra-high performance concrete (UltraHighPerformanceConcrete, abbreviation UHPC) is that one kind has superelevation
The novel concrete based composites of degree, superhigh tenacity and high-durability.Existing research the result shows that, ultra-high performance concrete with it is general
The adhesive property of logical concrete is excellent, is a kind of ideal maintenance of concrete structure reinforcement material.It is answered when using with high stretching
When becoming the ultra-high performance concrete of reinforcing property to concrete structure progress packaging type maintenance reinforcing, even if not to concrete structure
Bar planting operation is carried out, also can guarantee the globality of ultra-high performance concrete and concrete structure, and then simplifies reinforcement operation
Technique.On this basis, the underwater anti-dispersibility for further increasing ultra-high performance concrete, i.e., using very-high performance coagulation
Safe and efficient reinforcing of the soil to underwater concrete structure.For this reason, it is necessary to develop a kind of utilization ultra-high performance concrete reinforcing water
The reinforcement means of lower concrete structure.
Summary of the invention
The present invention there are long construction period, operating expenses height and reinforces effect for existing reinforcing underwater concrete structural approach
The problems such as fruit is undesirable discloses a kind of reinforcement means that underwater concrete structure is reinforced using ultra-high performance concrete, this hair
It is bright have many advantages, such as reinforcement means is easy, reinforce after bearing capacity of concrete structure and durability significantly improve.
To achieve the goals above, technical scheme is as follows: a kind of to be reinforced under water using ultra-high performance concrete
The reinforcement means of concrete structure, it is characterised in that specific reinforcement means includes the following steps:
Step 1: to stabilization zone removing surface；
Step 2: the basis cleaning to reinforced concrete structure；
Step 3: steel reinforcement cage is placed, and steel reinforcement cage is placed in on the basis of reinforced concrete structure, and should at least cover to
Stabilization zone；
Step 4: template installation, template are placed in on the basis of reinforced concrete structure, and are located on the outside of steel reinforcement cage；
Step 5: rubble and aggregate chips are toppled over, to template and to carry out toppling over rubble and stone in the gap of reinforced concrete structure
Bits；
Step 6: fast hard mortar under priming petock；
Step 7: perfusion ultra-high performance concrete；
Step 8: demoulding after maintenance.
In the present invention, in the step 1 to stabilization zone be concrete structure damaged part and its upper and lower 20cm range inner region
Domain is treated stabilization zone surface using giant by diver and is cleared up, mainly removal surface contaminants and the coagulation of loosening
Soil.
In the present invention, the step 2 by diver complete to surface mud on the basis of reinforced concrete structure and other
The removing of sundries guarantees that surface of base is smooth.
In the present invention, the steel reinforcement cage in the step 3 is according to the shape to reinforced concrete structure by two symmetrical structures
The mode for being banded or welding is formed by connecting, and steel reinforcement cage is made of transverse steel and longitudinal reinforcement, and transverse steel is on the outside, steel
Muscle cage is placed in on the basis of reinforced concrete structure, and distance is 20~30mm between template inner wall.
In the present invention, the template in the step 4 is passed through according to the shape to reinforced concrete structure by two symmetrical structures
Bolt fastening forms, and template is placed in on the basis of reinforced concrete structure.
In the present invention, the step 5 by first topple over the sequence that aggregate chips is toppled over after rubble to template with to reinforced concrete knot
Toppled in the gap of structure.Rubble selects continuous grading, and maximum particle diameter must not exceed and reinforce the 1/3 of thickness, and the amount of toppling over is answered
Guarantee that aggregate chips particle size range is 2-10mm away to 300~400mm below stabilization zone at the top of metalling, topple over a thickness of 100~
150mm。
In the present invention, underwater fast hard mortar compression strength after 3h has been perfused that the step 6 is selected reaches 10MPa or more,
Material filling mouth should keep fast hard mortar slurry face under water hereinafter, perfusion is with a thickness of 200~250mm in filling process.
In the present invention, the step 7 should carry out after step 6 completes 3h, and material filling mouth should be maintained at superelevation in filling process
Under performance concrete slurry face >=200mm at.
In the present invention, the ultra-high performance concrete that the step 7 is selected has high elongation strain reinforcing property and good
Underwater dispersion resistance energy, and it is the above-mentioned characteristic for realizing ultra-high performance concrete, the raw material group of the ultra-high performance concrete
At include: cement, miberal powder, flyash, silicon ash, quartz sand, silica flour, agstone, steel fibre, viscosity modifier, water-reducing agent,
Defoaming agent and water, each raw-material weight ratio are as follows:
Further, cement used is one of portland cement or ordinary portland cement, and strength grade is
One of 42.5 grades or 52.5 grades.
Further, miberal powder used is one of S95 grades or S105 grades miberal powders.
Further, flyash used is level-one flyash.
Further, silicon ash specific surface area >=20000m used2/ kg, and dioxide-containing silica >=90%.
Further, quartzy grain fineness number used is 20~50 mesh, and quartz powder fineness used is 120~200 mesh, lime used
Mountain flour fineness is 400 mesh.
Further, steel fibre used is the high-strength steel fibre of tensile strength >=2500MPa, and long straight or end hook can be selected
One or both of shape is used in mixed way, and long straight length of steel fiber used is 16~22mm, and diameter is 0.18~0.25mm, institute
It is 13~22mm with end hook type steel fibre length, diameter is 0.20~0.30mm.
Further, viscosity modifier used be hydroxypropyl methyl cellulose ether, k value be 8000MPas or
40000MPa·s。
Further, water-reducing agent used is poly carboxylic acid series water reducer, and water-reducing rate is not less than 25%, and defoaming agent used is ether
Class defoaming agent.
Further, water used is tap water.
In the present invention, preparation process that ultra-high performance concrete needed for preparation step 7 is taken are as follows: weigh in proportion each
Raw material, it is first that all dry material premixings are uniform, then by water or be mixed with the water of water-reducing agent and defoaming agent mix, object to be mixed is added
When in uniform fluidised form shape, steel fibre is added thereto and continues to be stirred until homogeneous.
In the present invention, the internal diameter of material filling hose should be fibre length in ultra-high performance concrete in the step 6 and step 7
2~3 times.
In the present invention, the maintenance work of the step 8 can carry out striking job not less than for 24 hours later.
In the present invention, using concrete structure damaged part and its upper and lower 20cm range inner region as to stabilization zone, simultaneously
The dirt on stabilization zone surface is treated using giant and loosens concrete and is purged, and its purpose is to improve to reinforce effect
Fruit.
In the present invention, surface carries out mud and the removing of other sundries on the basis for the treatment of reinforced concrete structure, makes base
Plinth surfacing is and then to guarantee pouring quality and consolidation effect to guarantee that subsequent steel reinforcement cage and template are placed steady.
In the present invention, steel reinforcement cage and template are all in accordance with shape two symmetrical structure groups of selection to reinforced concrete structure
At, the installation of steel reinforcement cage and template is facilitated, and steel reinforcement cage is 20-30mm away from distance between template inner wall, the purpose is to guarantee one
Fixed thickness of protection tier.
In the present invention, by first topple over sequence that aggregate chips is toppled over after rubble to template in the gap of reinforced concrete structure
Toppled over.Rubble selects continuous grading, and maximum particle diameter must not exceed and reinforce the 1/3 of thickness, and the purpose is to guarantee rubble energy
Enough smoothly to fall and accumulate closely, aggregate chips particle size range is 2-10mm, is toppled over a thickness of 100-150mm, the purpose is in rubble
Layer top forms the close aggregate chips layer of layer heap product, guarantees that mortar is non-leakage when fast hard mortar under subsequent priming petock.
In the present invention, underwater fast hard mortar compression strength after 3h has been perfused of selection reaches 10MPa or more, and the purpose is to protect
The perfusion of subsequent ultra-high performance concrete is demonstrate,proved, improves and reinforces efficiency.
In the present invention, selecting, there is high elongation strain reinforcing and the ultra-high performance concrete of underwater anti-dispersing characteristic to carry out water
The reinforcing of lower concrete structure improves ultra-high performance concrete and globality to reinforced concrete structure, compensate for not into
The deficiency of row bar planting operation.
In the present invention, by the rational design to ultra-high performance concrete match ratio, ultra-high performance concrete is realized
High elongation strain strengthens and underwater anti-dispersing characteristic.In mix-design, reasonably optimizing cementitious material (cement, miberal powder, fine coal
Ash and silicon ash) proportion, not only realize the closestpacking of gelling material particles, it is ensured that good between hardened paste and steel fibre
Good adhesion strength, while steel fiber types and parameter are reasonably selected, it ensure that the high elongation strain of ultra-high performance concrete is strong
Change characteristic.And select the hydroxypropyl methyl cellulose ether that k value is 8000MPas or 40000MPas as viscosity-adjusting agent
Agent can significantly improve the underwater anti-dispersibility of ultra-high performance concrete, while will not significantly reduce the power of ultra-high performance concrete
Learn performance.
In the present invention, the material filling inner diameter for hard mortar fast under priming petock and ultra-high performance concrete should be superelevation
2~3 times of length of steel fiber in energy concrete, the purpose is to guarantee the smooth perfusion of two kinds of materials.
In the present invention, ultra-high performance concrete is completed to conserve after being perfused can no less than carry out demoulding for 24 hours, specific to conserve
Duration should be determined according to the strength development situation of ultra-high performance concrete.In general, strength development is fast when environment temperature is higher, ring
Then strength development is slow when border temperature is lower.
The present invention has the advantages that compared with existing underwater concrete structural maintenance reinforcement means
1) it selects the ultra-high performance concrete with tension stiffening characteristic to treat reinforced concrete structure to be reinforced, remove from
To bar planting operation on reinforced concrete structure, reinforcement means is easy；
2) ultra-high performance concrete with it is good to reinforced concrete structure adhesive property, ensure that consolidation effect；
3) ultra-high performance concrete has high mechanical property and extremely low impermeability, thus after significantly improving reinforcing
Structural bearing capacity and durability.
Detailed description of the invention
Fig. 1 is the schematic diagram that underwater concrete structure is reinforced using ultra-high performance concrete.In figure, 0 is water；1 is to be added
Concrete structure under solid water, 1-1 are to stabilization zone；2 be the basis to reinforced concrete structure；3 be steel reinforcement cage, and 3-1 is laterally
Reinforcing bar, 3-2 are longitudinal reinforcement；4 be template；5 be metalling；6 be aggregate chips layer；7 be underwater fast hard mortar；8 is mixed for very-high performance
Solidifying soil；9 be material filling hose.
Fig. 2 is the front view that ultra-high performance concrete axis draws test sample structure.
Fig. 3 is the side view of Fig. 2.
Fig. 4 is the top view of Fig. 2.
Fig. 5 is 1 gained ultra-high performance concrete 28d age tensile stress-strain curve of embodiment.
Fig. 6 is 2 gained ultra-high performance concrete 28d age tensile stress-strain curve of embodiment.
Fig. 7 is 3 gained ultra-high performance concrete 28d age tensile stress-strain curve of embodiment.
Specific embodiment
Below in conjunction with attached drawing and specific embodiment to proposed by the present invention a kind of underwater using ultra-high performance concrete reinforcing
The reinforcement means of concrete structure is described in further detail, it should be understood that specific embodiment described herein is only used
To explain the present invention, it is not intended to limit the present invention.
As shown in Figure 1, being completed to stabilization zone 1-1 surface contaminants by diver and being loosened the removing work of concrete, simultaneously
2 surface of basis to reinforced concrete structure is cleared up, guarantees basic 2 surfacings, then by steel reinforcement cage 3 and template 4
2 surface of basis to reinforced concrete structure is installed and be placed in respectively, and graded broken stone is poured into coagulation under solid water to be added
In the gap of soil structure 1 and template 4, form metalling 5,5 upper surface of metalling away to 300~400mm below the 1-1 of stabilization zone,
Then aggregate chips is poured into again to form aggregate chips layer 6, with a thickness of 100~150mm.By mortar 7 fast hard under 9 priming petock of material filling hose,
The port of material filling hose 9 should be located at underwater fast hard 7 slurry face of mortar hereinafter, after underwater fast hard mortar 7 pours and finishes 3h, continue
Ultra-high performance concrete 8 is perfused, the port of material filling hose 9 should be located under 8 slurry face of ultra-high performance concrete >=200mm, superelevation
Performance concrete 8 should carry out maintenance no less than for 24 hours after the completion of being perfused, then carry out demoulding.So far, very-high performance coagulation is utilized
The reinforcement that soil reinforces underwater concrete structure is completed.
To realize that there is a kind of ultra-high performance concrete for reinforcing underwater concrete structure high elongation strain to strengthen and underwater
The preparation of anti-dispersing characteristic, the ultra-high performance concrete can be said by following examples 1, embodiment 2 and embodiment 3
It is bright.
Embodiment 1, a kind of ultra-high performance concrete for reinforcing underwater concrete structure, by cement (42.5 grades of silicate cements
Mud) 100, miberal powder (S105 grades) 25, flyash 15, silicon ash 15, quartz sand 55, silica flour 36, agstone 25, steel fibre (length
Spend 18mm, the end hook type steel fibre of diameter 0.25mm) 17.8, (k value is the hydroxypropyl first of 8000MPas to viscosity modifier
Base cellulose ether) 0.06, the weight ratio of water-reducing agent (powdery) 1.5, defoaming agent (powdery) 0.2 and water 27 weighs raw material respectively,
Again together by cement, miberal powder, flyash, silicon ash, quartz sand, silica flour, agstone, viscosity modifier, water-reducing agent, defoaming agent
It is added to premixing in forced stirrer to mix, then disposably adds water in agitated kettle and continue to stir, to mixture in equal
It is uniform to mixture stirring in steel fibre addition mixture, will to be continued when uniform flow state shape, ultra-high performance concrete is obtained, is denoted as U-
1；
Embodiment 2, a kind of ultra-high performance concrete for reinforcing underwater concrete structure, by cement (52.5 grades of silicate cements
Mud) 100, miberal powder (S95 grades) 40, flyash 17, silicon ash 32, quartz sand 75, silica flour 50, agstone 30, steel fibre (length
The long straight steel fibre of 19mm, diameter 0.22mm) 30.5, (k value is the hydroxypropyl methyl of 8000MPas to viscosity modifier
Cellulose ether) 0.11, the weight ratio of water-reducing agent (liquid) 2.0, defoaming agent (liquid) 0.3 and water 36 weighs raw material respectively, then
Cement, miberal powder, flyash, silicon ash, quartz sand, silica flour, agstone and viscosity modifier are added to action of forced stirring together
Premixing mixes in machine, and then the water for being mixed with water-reducing agent and defoaming agent is added at one time in agitated kettle and continues to stir, to mix
It is uniform to mixture stirring in steel fibre addition mixture, will to be continued when object is in uniform fluidised form shape, obtains ultra-high performance concrete,
It is denoted as U-2；
Embodiment 3, a kind of ultra-high performance concrete for reinforcing underwater concrete structure, by cement (52.5 grades of common silicic acid
Salt cement) 100, miberal powder (S95 grades) 50, flyash 20, silicon ash 40, quartz sand 90, silica flour 60, agstone 44, steel fibre
(the long straight steel fibre and length 16mm of length 16mm, diameter 0.18mm, the end hook type steel fibre of diameter 0.20mm is by 4:6's
Weight ratio is used in mixed way) 38.5, viscosity modifier (hydroxypropyl methyl cellulose ether that k value is 40000MPas) 0.16,
The weight ratio of water-reducing agent (liquid) 2.4, defoaming agent (liquid) 0.4 and water 39 weighs raw material respectively, then by cement, miberal powder, powder
Coal ash, silicon ash, quartz sand, silica flour, agstone and viscosity modifier are added to premixing in forced stirrer together and mix, with
The water for being mixed with water-reducing agent and defoaming agent is added at one time in agitated kettle afterwards and continues to stir, when mixture is in uniform fluidised form shape
It is uniform to mixture by stirring in steel fibre addition mixture, is continued, ultra-high performance concrete is obtained, U-3 is denoted as；
Three kinds of ultra-high performance concretes that embodiment 1 is obtained into embodiment 3 carry out the production of tensile sample, sample shape
Shape and size are provided by Fig. 2~Fig. 4, wherein R=62.5mm, a1=50mm, a2=25mm, a=100mm, b=100mm, h=
500mm, h1=100mm, h2=150mm；Standard curing is carried out to sample and tensile property test is carried out to 28d age sample,
The tensile stress-strain curve for obtaining 3 groups of samples carries out sample test result in figure respectively as shown in Fig. 5, Fig. 6 and Fig. 7
Statistics, the results are shown in Table 1.
The statistics of ultra-high performance concrete 28d age extension test result obtained by 1 embodiment of table
The tensile stress-strain curve of the sample obtained by three groups of embodiments it can be seen from Fig. 5, Fig. 6 and Fig. 7 and combination table 1
Apparent tension stiffening characteristic is shown, and work-hardening exponential is high, limit tensile strain is big.Thus illustrate, the present invention is real
It applies ultra-high performance concrete obtained by example and all has high elongation strain reinforcing property.
It should be noted that the application of the present invention is not limited to the above for those of ordinary skills can
With improvement or transformation based on the above description, all these modifications and variations all should belong to the guarantor of appended claims of the present invention
Protect range.
Claims (10)
1. a kind of reinforcement means for reinforcing underwater concrete structure using ultra-high performance concrete, it is characterised in that specific reinforcing side
Method includes the following steps:
Step 1: to stabilization zone removing surface；
Step 2: the basis cleaning to reinforced concrete structure；
Step 3: steel reinforcement cage is placed, and steel reinforcement cage is placed in on the basis of reinforced concrete structure, and should at least be covered wait reinforce
Area；
Step 4: template installation, template are placed in on the basis of reinforced concrete structure, and are located on the outside of steel reinforcement cage；
Step 5: rubble and aggregate chips are toppled over, to template and to carry out toppling over rubble and aggregate chips in the gap of reinforced concrete structure；
Step 6: fast hard mortar under priming petock；
Step 7: perfusion ultra-high performance concrete；
Step 8: demoulding after maintenance.
2. a kind of reinforcement means that underwater concrete structure is reinforced using ultra-high performance concrete according to claim 1,
It is characterized in that stabilization zone be damaged part to reinforced concrete structure and its upper and lower 20cm range inner region in step 1,
Stabilization zone surface is treated using giant by diver to clear up, and removes the concrete of surface contaminants and loosening.
3. a kind of reinforcement means that underwater concrete structure is reinforced using ultra-high performance concrete according to claim 1,
It is characterized in that the steel reinforcement cage in step 3 is banded or is welded by two symmetrical structures according to the shape to reinforced concrete structure
Mode be formed by connecting, steel reinforcement cage is made of transverse steel and longitudinal reinforcement, and transverse steel is on the outside, steel reinforcement cage be placed in
On the basis of reinforced concrete structure.
4. a kind of reinforcement means that underwater concrete structure is reinforced using ultra-high performance concrete according to claim 1,
It is characterized in that template in step 4 according to the shape to reinforced concrete structure by two symmetrical structures through bolt fastening and
It is placed at, template on the basis of reinforced concrete structure, and distance is 20 ~ 30mm between template inner wall and steel reinforcement cage.
5. a kind of reinforcement means that underwater concrete structure is reinforced using ultra-high performance concrete according to claim 1,
It is characterized in that step 5 by first topple over the sequence that aggregate chips is toppled over after rubble to template in the gap of reinforced concrete structure into
Row is toppled over, and rubble selects continuous grading, and maximum particle diameter must not exceed and reinforce the 1/3 of thickness, and the amount of toppling over should ensure that metalling top
Away to 300 ~ 400mm below stabilization zone, aggregate chips particle size range is 2-10mm in portion, is toppled over a thickness of 100 ~ 150mm.
6. a kind of reinforcement means that underwater concrete structure is reinforced using ultra-high performance concrete according to claim 1,
It is characterized in that underwater fast hard mortar compression strength after 3h has been perfused that step 6 is selected reaches 10MPa or more, filled in filling process
Material mouth should keep fast hard mortar slurry face under water hereinafter, perfusion is with a thickness of 200 ~ 250mm；The very-high performance that step 7 is selected is mixed
Solidifying soil, perfusion should carry out after step 6 completes 3h, and material filling mouth should be maintained under ultra-high performance concrete slurry face in filling process
At >=200mm.
7. a kind of reinforcement means that underwater concrete structure is reinforced using ultra-high performance concrete according to claim 1,
It is characterized in that the ultra-high performance concrete that the step 7 is selected has high elongation strain reinforcing property and underwater anti-point good
Dissipate performance.
8. a kind of reinforcement means that underwater concrete structure is reinforced using ultra-high performance concrete according to claim 7,
It is characterized in that the raw material composition of the ultra-high performance concrete includes: cement, miberal powder, flyash, silicon ash, quartz sand, stone
Ying Fen, agstone, steel fibre, viscosity modifier, water-reducing agent, defoaming agent and water, each raw-material weight ratio are as follows:
Cement 100
Miberal powder 25-50
Flyash 15-20
Silicon ash 15-40
Quartz sand 55-90
Silica flour 36-60
Agstone 25-44
Steel fibre 17.8-38.5
Viscosity modifier 0.06-0.16
Water-reducing agent 1.1-2.4
Defoaming agent 0.2-0.4
Water 26-39.
9. a kind of reinforcement means that underwater concrete structure is reinforced using ultra-high performance concrete according to claim 1,
It is characterized in that carrying out material filling using material filling hose in step 6 and step 7, the internal diameter of material filling hose should be ultra-high performance concrete
2 ~ 3 times of middle fibre length.
10. a kind of reinforcement means that underwater concrete structure is reinforced using ultra-high performance concrete according to claim 1,
Step 8 is characterized in that carry out after ultra-high performance concrete completes perfusion not less than maintenance for 24 hours, followed by demoulding.
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| CN113482053A (en) * | 2021-07-12 | 2021-10-08 | 上海东华建设管理有限公司 | Caisson connecting section triangular area underwater concrete construction structure and construction method |
| TWI765776B (en) * | 2021-07-12 | 2022-05-21 | 李嘉峻 | Circular water injection cleaning and cofferdam construction methods |
| CN115288126A (en) * | 2022-08-01 | 2022-11-04 | 广州市市政工程设计研究总院有限公司 | UHPC (ultra high performance concrete) reinforced pile foundation and reinforcing method thereof |
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