CN104863063A - Bridge underwater structure cofferdam-free fast reinforcing method based on PVC composite formwork - Google Patents
Bridge underwater structure cofferdam-free fast reinforcing method based on PVC composite formwork Download PDFInfo
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- CN104863063A CN104863063A CN201510279538.5A CN201510279538A CN104863063A CN 104863063 A CN104863063 A CN 104863063A CN 201510279538 A CN201510279538 A CN 201510279538A CN 104863063 A CN104863063 A CN 104863063A
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- composite shuttering
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
- E02D27/12—Pile foundations
Abstract
The invention discloses a bridge underwater structure cofferdam-free fast reinforcing method based on a PVC (Polyvinyl Chloride) composite formwork. The method comprises the following concrete steps of construction platform building, underwater pile foundation surface treatment, FRP (Fiber Reinforce Plastic) basalt grid installation, PVC composite formwork installation and concrete casting. The bridge underwater structure cofferdam-free fast reinforcing method is based on the PVC composite formwork which replaces a conventional set-shaped formwork; the PVC composite formwork has the advantages that the manufacturing cost is lower, and the installation can be completed only through manual cooperation in the installation process; the novel technical scheme suitable for practical use is provided on the basis; the safety of construction personnel is improved; the construction quality is ensured; the construction period is shortened; and the investment cost is reduced.
Description
Technical field
The present invention relates to a kind of bridge underwater structures and exempt from cofferdam method for rapidly reinforcing, particularly relate to a kind of bridge underwater structures based on PVC composite shuttering and exempt from cofferdam method for rapidly reinforcing, belong to underwater project construction technical field.
Background technology
At present, under domestic water, the reinforcing major part of bridge pier shaft, pile foundation adopts that draw water in traditional cofferdam, steel form builds concrete construction process, and drawing water in cofferdam needs a large amount of construction periods, accounts for 60% of total lever factor, and cofferdam costly, construction risk is very large; Though the set shaped steel formwork that pier shaft, pile foundation reinforcement adopt can reuse, single form cost is high, need machinery to coordinate when installing, during operation at sea to the area of operation platform and requirement for bearing capacity higher.
Summary of the invention
In order to the weak point in solving the problem, the invention provides a kind of bridge underwater structures based on PVC composite shuttering and exempt from cofferdam method for rapidly reinforcing.
For solving above fixation problem, the solution that the present invention adopts is: cofferdam method for rapidly reinforcing exempted from by a kind of bridge underwater structures based on PVC composite shuttering, and concrete step of reinforcing is as follows:
I, operation platform are set up
Utilize steel pipe in the outside of circular pier, fastener sets up three-back-shaped scaffolding platform, width 130cm, the closest approach of the inner side distance bridge pier of scaffolding platform is 50cm, and longitudinal width of scaffolding platform endoporus is 220cm, and scaffolding platform length and wide size are 480cm;
II, underwater pile surfacing
A, disease incidence are examined
Before construction, first the disease incidence of underwater foundation pile foundation is examined;
B, underwater pile surfacing
Underwater pile process mainly comprises two aspects: one is process pile foundation surface; Two is carry out smooth to pile foundation bottom periphery riverbed;
Pile body is cleared up to pile body surface before reinforcing;
Check that pile body surface leaks outside reinforcing bar, to exposed steel bar processing of rust removing;
Stake bottom reason;
C, FRP basalt grid is installed
Underwater pile facing operation can carry out the installation work of FRP basalt grid, after FRP basalt grid is transported to scene, is centered around pile body surrounding after checking and accepting, and utilizing tied silk its colligation to be become, diameter 1.7m's is cylindrical, girth 5.34m; FRP basalt grid, single size of mesh opening is 10cm × 5cm, and overall dimensions is 1 × 6m, three pieces of FRP basalt grid transverse laps are needed to make FRP basalt grid cage altogether, every block FRP basalt grid laterally around pile body one week, vertical lap length 70cm, transverse lap length 10cm; In overlapping regions, all grid nodes all adopt tied silk colligation firm;
Every segment distance colligation stop and a concrete pad on FRP basalt grid cage, stop be vertically spaced apart 0.8m, horizontal spacing 0.8m, be advisable equidistantly to lay around pile body direction; Stop adopts precast concrete cushion block, size 10 × 5 × 10cm, as the stopping means of FRP basalt grid and PVC composite shuttering; In case FRP basalt grid and pile body, space between PVC composite shuttering are too small, setting is close together;
After the installation of basalt grid, water can be descended in place;
D, PVC composite shuttering is installed
Determine that PVC composite shuttering adopts the thick PVC board of 1.0cm to make the column type template of internal diameter 1.9m height 3m according to disease incidence, FRP basalt grid underwater structures; For convenience of assembled, PVC composite shuttering is divided into four pieces high 1.5m semicolumn section mould plates, the flange that half and half column type template adopts PVC board bar to make coordinates high-strength bolt to connect, and for strengthening the rigidity of PVC composite shuttering, outside template, arranges one iron belt every 30cm;
PVC composite shuttering adopt prefabrication, prefabricated complete after, first carry out assembled examination, for subsequent use to job site through logistics transportation after examination;
After treating that bridge pier FRP basalt grid is in place, the on-site consolidation of PVC composite shuttering can be carried out;
First adopt hand fit Chain block, that head is saved PVC composite shuttering by wire rope is in place on operation platform, PVC composite shuttering is assembled to be completed to utilize high-strength bolt, pad to be saved by head, and iron belt is tightened in the outside of first joint PVC composite shuttering; Assembled complete after ensure first joint template end face be same level, be beneficial to the assembled of second section PVC composite shuttering;
Head is saved PVC composite shuttering submerged, to be positioned under operation platform till edge until its end face, to facilitate the assembled of second section PVC composite shuttering; Utilize artificial being moved to by second section PVC composite shuttering above first joint PVC compound die template, the bolt hole of alignment lateral connection flange, tights a bolt after penetrating bolt, then carries out the connection work of vertical adpting flange;
Second section PVC composite shuttering is assembled complete after, the assembled checking and accepting of whole PVC composite shuttering can be carried out; After examination, that carries out PVC composite shuttering enters water work in place;
When PVC composite shuttering enters water, utilize iron plate to make four suspension centres and be arranged symmetrically in middle and upper part outside second section PVC composite shuttering, sunk by Chain block lifting, the underwater guide of diver, basalt grid can be avoided and concrete pad sinks under water in place smoothly; Adopt weight such as straw bag parcel graded broken stone etc. template to be buried bottom PVC composite shuttering, running pulp when preventing concreting, buried depth is advisable with 30 ~ 40cm, buries underground two-layer inside and outside straw bag;
PVC composite shuttering is in place complete, through submarine inspection, after examination, can carry out underwater concreting work;
E, concreting
The concrete of perfusion adopts non-dispersible underwater concrete;
Concrete mixing adopts concrete mixer to carry out mix, often organizes duration of mixing and is about 10min;
Filling concrete adopts underwater grouting, utilizes the pvc pipe of 10cm × 4m to coordinate PVC funnel, joint etc. to make underwater grouting conduit; Conduit I and conduit II is inserted inside template respectively, pile foundation reinforcement region outside FRP basalt grid, apart from riverbed 10cm at the bottom of conduit; First carry out back cover to casting area in template to build, build height 10 ~ 15cm, in case during monobloc cast, it is excessive that pressure is born in substrate, causes the generation of frost boiling, template cracking phenomena bottom template;
Can formally build after 12h built by back cover; Consider mobility, self compacting ability in the water of non-dispersible underwater concrete, formally build and adopt DLC underwater grouting, be arranged symmetrically in pile foundation periphery by two cover conduits, pour into simultaneously;
The circular hole that the concrete mixed mixes feed hopper bottom through self-control flows into PVC funnel, pours into underwater pile reinforcing area through pvc pipe;
In filling process, according to filling concrete amount, depth of tremie situation, tube drawing, brachymemma process are carried out to conduit, make concrete buried depth be not more than 1.5 ~ 2m;
After concreting to design height, slowly upwards pull up conduit, until conduit ground is a little less than concrete surface, slow concreting is until underwater concrete overflows PVC composite shuttering; Extract conduit again, rely on concrete self mobility, self compacting ability, complete under water after Self-leveling, diver clears up PVC composite shuttering end face, outside concrete, makes that the concrete surface of newly building is smooth, clean outside template;
Health; Carry out health after concreting completes, treat that concrete strength acquires a certain degree rear collapsible die inspection;
In casting process, field fabrication concrete sample in the concrete mixed, health under on-the-spot synchronous condition, to be onstructed complete after 7d test specimen is taken back laboratory and carries out standard curing, and carry out the experiment of 7d, 28d concrete strength.
The present invention is based on PVC composite shuttering and replace traditional set shaped steel formwork, PVC composite shuttering cost is lower, only need hand fit and achievable advantage when installing, propose on this basis to be suitable for practical new technical scheme, improve the safety of constructor, ensure the quality of construction, reduction of erection time, save input cost.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
Fig. 1 is the schematic diagram that operation platform of the present invention is set up.
Fig. 2 is that FPR basalt grid of the present invention arranges structural representation.
Fig. 3 is that PVC composite shuttering of the present invention is installed.
Fig. 4 is concreting perfusion plan view.
In figure: 1, scaffolding platform; 2, bridge pier; 3, stop; 4, FRP basalt grid; 5, high-strength bolt; 6, PVC composite shuttering; 7, conduit I; 8, conduit II.
Detailed description of the invention
Strengthening flow process of the present invention, specifically comprises the following steps:
1, operation platform is set up
As shown in Figure 1, utilize steel pipe, fastener etc. to set up three-back-shaped scaffolding platform 1 in the outside of circular pier 2, width 130cm (also can determine by the width of the plank bought), the closest approach of the inner side distance bridge pier 2 of scaffolding platform 1 is about 50cm, longitudinal width of scaffolding platform 1 endoporus is 220cm, and scaffolding platform length and wide size are 480cm.
2, underwater foundation primary surface process
2.1, disease incidence is examined
Before construction, first to disease (breakage of pile foundation concrete, the corrosion of underwater foundation pile foundation, pile foundation reinforcing steel bars exposed, corrosion of steel bar, reinforcing bar rupture, pile foundation undergauge, wash away and empty) situation examines, and according to disease actual conditions, water level actual conditions, carry out construction technology adjustment.
For Bei Gang lake, Jiujiang City underwater foundation base stabilization works (24-1# stake).
24-1# bridge pier disease is checked: (1) this within the scope of the above 2m in riverbed 2/3 and 50cm within the scope of 1/3 topping have obscission, maximum area 20cm × 30cm; (2) reveal muscle phenomenon general, there is the gap can stretching into whole palm at vertical muscle place; (3) stirrup seriously corroded, the even fracture had; (4) pile foundation and bridge pier junction have dislocation phenomenon, platform Breadth Maximum 25cm, minimum widith 10cm; (5) riverbed out-of-flatness, maximum discrepancy in elevation 20cm.
Measure 24-1# stake underwater foundation long: the water surface to bed level is 3.7m, 3.7m, 3.5m, 3.65m.The water surface to stake heights of roofs is 0.4m.Namely underwater foundation is about as 3.3m
2.2, underwater foundation primary surface process
The process of underwater foundation base mainly comprises two aspects: one is process pile foundation surface; Two is carry out smooth to pile foundation bottom periphery riverbed.
(1) bridge pier pile body is cleared up to bridge pier pile body surface before reinforcing.Utilize the impurity such as the aquatile of underwater cleaning device clear body structure surface, mud.
(2) check that bridge pier pile body surface leaks outside reinforcing bar, to exposed steel bar processing of rust removing.
(3) stake bottom reason.The situation that ditch, hole etc. affect strengthening construction is existed for stake bottom perimeter, adopts burying method, utilize graded sand and stone to its row landfill compacting, finally undertaken levelling by diver, make basic maintenance bottom pile foundation smooth-going.Affect the dead meals such as the concrete of strengthening construction to what be scattered around pile foundation, before reinforcing, underwater construction operation face is cleared up, remove and affect rejected material in the water such as concrete, stone of construction operation, build good underwater operation environment.
2.3, FRP basalt grid is installed
FRP: glass fiber reinforced plastic (Fiber Reinforced Plastic, FRP) also known as glass fiber reinforced plastic or glass-steel reinforced plastic, be a kind of be matrix with macromolecule epoxy resin, glass fiber reinforced plastic or carbon fiber etc. are reinforcement, the composite material made through combination process.
(1) after the work for the treatment of of underwater foundation primary surface is checked and accepted, the installation work of FRP basalt grid 4 can be carried out, after FRP basalt grid is transported to scene, be centered around bridge pier pile body surrounding, utilize tied silk its colligation to be become cylindrical (the girth 5.34m) of diameter 1.7m.FRP basalt grid (each grid is of a size of 10cm × 5cm) size 1 × 6m, three pieces of FRP basalt grid transverse laps are needed to make FRP basalt grid cage altogether, every block FRP basalt grid is laterally around bridge pier pile body one week, vertical lap length 70cm, transverse lap length 10cm.In overlapping regions, all grid nodes all adopt tied silk colligation firm.
(2) on FRP basalt grid cage every a segment distance colligation stop 3 (concrete pad), stop 3 be vertically spaced apart 0.8m, horizontal spacing 0.8m, be advisable equidistantly to lay around bridge pier pile body direction.Stop adopts precast concrete cushion block, size 10 × 5 × 10cm, as the stopping means of FRP basalt grid and PVC composite shuttering.In case basalt grid and bridge pier pile body, space between PVC composite shuttering are too small, setting is close together.
(3), after the installation of basalt grid, water can be descended in place.
2.4, PVC composite shuttering is installed
(1) determine that PVC composite shuttering 6 adopts the thick PVC board of 1.0cm to make the column type template of internal diameter 1.9m height 3m according to disease incidence, FRP basalt grid underwater structures reinforcing technique.For convenience of assembled, PVC composite shuttering is divided into four pieces high 1.5m semicolumn section mould plates, the flange that half and half column type template adopts PVC board bar to make coordinates high-strength bolt to connect.For strengthening the rigidity of PVC composite shuttering, outside template, one iron belt is set every 30cm.Template concrete shape as shown in Figure 3.
(2) PVC composite shuttering adopt prefabrication, prefabricated complete after, first carry out assembled examination, for subsequent use to job site through logistics transportation after examination.
(3), after treating that 24-1# bridge pier FRP basalt grid is in place, the on-site consolidation of PVC composite shuttering can be carried out.
(4) first adopt hand fit Chain block, that head is saved PVC composite shuttering by wire rope is in place on operation platform, PVC composite shuttering is assembled to be completed to utilize high-strength bolt, pad to be saved by head, and iron belt is tightened in the outside of first joint PVC composite shuttering.Assembled complete after ensure first joint template end face be same level, be beneficial to the assembled of second section PVC compound die.
(5) head is saved PVC composite shuttering submerged, to be positioned under operation platform till edge until its end face, to facilitate the assembled of second section PVC composite shuttering.Utilize artificial being moved to by second section PVC composite shuttering above first joint template, the bolt hole of the lateral connection flange that aligns, tights a bolt after penetrating bolt, then carries out the connection work of vertical adpting flange.If any template gap, then eliminate template gap by second section PVC composite shuttering lateral rotation in a small amount.
(6) second section PVC composite shuttering is assembled complete after, the assembled checking and accepting of whole PVC composite shuttering can be carried out.After examination, that carries out PVC composite shuttering enters water work in place.
(7) when PVC composite shuttering enters water, utilize iron plate to make four suspension centres and be arranged symmetrically in middle and upper part outside second section PVC composite shuttering, sunk by Chain block lifting, the underwater guide of diver, basalt grid can be avoided and concrete pad sinks under water in place smoothly.Adopt weight such as straw bag parcel graded broken stone etc. template to be buried bottom PVC composite shuttering, running pulp when preventing concreting, buried depth is advisable with 30 ~ 40cm, buries underground two-layer inside and outside straw bag.
(8) PVC composite shuttering is in place complete, through submarine inspection, after examination, can carry out underwater concreting work.
The concrete technical indicator of PVC composite shuttering:
1, cylindrical form diameter 1.9m, radius 0.95m, girth 5.966m.Make half range 2.983+0.1=3.083m (every side adds the floor of 5cm)
2, PVC composite shuttering floor junction is evenly arranged 1 ~ 2 reinforcement PVC bar between two bolts hole, adopts two-sided welding.
3, must arrange weld seam as made template, be then set to transverse weld, outside is evenly arranged reinforcement welding rod, and welding rod is unsuitable long, need avoid steel band position.
4, high-strength bolt is 8.8 grades, diameter 14cm, template is arranged the bolt hole of diameter 16cm.
5, template longitudinally adds iron belt (thick 3mm, wide 5cm) reinforcing every 30cm, is connected by high-strength bolt.
2.5, concreting
(1), the concrete of perfusion adopts non-dispersible underwater concrete, be configured in strict accordance with design mixture proportion, the batch qualities such as the cement selected, admixture, aggregate, Admixture must meet the relevant regulations of existing national standards, and its quality requirement is stablized and had inspection certificate of quanlity.Match ratio must meet the requirement of concrete design strength, land and water strength ratio, under water dispersion resistance, durability and construction workability, and answers economical rationality.
(2), concrete mixing adopt concrete mixer carry out mix, often organize duration of mixing be about 10min.
(3), filling concrete adopts underwater grouting, utilizes the pvc pipe of 10cm × 4m to coordinate PVC funnel, joint etc. to make underwater grouting conduit.Conduit I7 and conduit II8 is inserted inside template respectively, pile foundation reinforcement region outside FRP basalt grid, apart from riverbed 10cm at the bottom of conduit.First carry out back cover to casting area in template to build, build height 10 ~ 15cm, in case during monobloc cast, it is excessive that pressure is born in substrate, to cause bottom template the phenomenon generations such as frost boiling, template cracking.
(4) can formally build after, 12h built by back cover.Consider mobility, self compacting ability in the water of non-dispersible underwater concrete, formally build and adopt DLC underwater grouting, be arranged symmetrically in pile foundation periphery by two cover conduits, pour into simultaneously.Pour into plan view as shown in Figure 4:
The circular hole that the concrete mixed mixes feed hopper bottom through self-control flows into PVC funnel, pours into underwater foundation base reinforcing area through PVC conduit.
In filling process, according to filling concrete amount, depth of tremie situation, tube drawing, brachymemma process are carried out to PVC conduit, make concrete buried depth be not more than 1.5 ~ 2m.
After concreting to design height, slowly upwards pull up conduit, until conduit ground is a little less than concrete surface, slow concreting is until underwater concrete overflows PVC composite shuttering.Extract conduit again, rely on concrete self mobility, self compacting ability, complete under water after Self-leveling, diver clears up PVC composite shuttering end face, outside concrete, makes that the concrete surface of newly building is smooth, clean outside template.
(7), health.Carry out health after concreting completes, treat that concrete strength acquires a certain degree rear collapsible die inspection.The template of this demonstration project does not need form removal, through i.e. referable examination after the assay was approved.
(8), in casting process, field fabrication concrete sample in the concrete mixed, health under on-the-spot synchronous condition, to be onstructed complete after (about after 7d) test specimen is taken back laboratory and carries out standard curing, and carry out 7d, 28d concrete strength and test.
Non-dispersible underwater concrete test piece intensity
Patent of invention adopts PVC composite shuttering to replace conventional steel template, FRP basalt grid to replace reinforcing bar, can carry out installation exercise under water quickly and easily, effectively save the construction period, decreases operating expenses.
PVC composite shuttering should can single use, and after concreting completes, PVC composite shuttering need not be removed, and forms new topping, prevent current from again washing away concrete or corrode on young concrete surface.
Above-mentioned embodiment is not limitation of the present invention; the present invention is also not limited in above-mentioned citing; the change that those skilled in the art make within the scope of technical scheme of the present invention, remodeling, interpolation or replacement, also all belong to protection scope of the present invention.
Claims (1)
1. a cofferdam method for rapidly reinforcing exempted from by the bridge underwater structures based on PVC composite shuttering, it is characterized in that: concrete step of reinforcing is as follows:
I, operation platform are set up
Utilize steel pipe in the outside of circular pier (2), fastener sets up three-back-shaped scaffolding platform (1), width 130cm, the closest approach of inner side distance bridge pier (2) of scaffolding platform (1) is 50cm, longitudinal width of scaffolding platform (1) endoporus is 220cm, and scaffolding platform length and wide size are 480cm;
II, underwater pile surfacing
A, disease incidence are examined
Before construction, first the disease incidence of underwater foundation pile foundation is examined;
B, underwater pile surfacing
Underwater pile process mainly comprises two aspects: one is process pile foundation surface; Two is carry out smooth to pile foundation bottom periphery riverbed;
Pile body is cleared up to pile body surface before reinforcing;
Check that pile body surface leaks outside reinforcing bar, to exposed steel bar processing of rust removing;
Stake bottom reason;
C, FRP basalt grid is installed
After underwater pile facing operation is checked and accepted, the installation work of FRP basalt grid (4) can be carried out, after FRP basalt grid is transported to scene, be centered around pile body surrounding, utilizing tied silk its colligation to be become, diameter 1.7m's is cylindrical, girth 5.34m; FRP basalt grid, single size of mesh opening is 10cm × 5cm, and overall dimensions is 1 × 6m, three pieces of FRP basalt grid transverse laps are needed to make FRP basalt grid cage altogether, every block FRP basalt grid laterally around pile body one week, vertical lap length 70cm, transverse lap length 10cm; In overlapping regions, all grid nodes all adopt tied silk colligation firm;
Every segment distance colligation stop (3) i.e. concrete pad on FRP basalt grid cage, stop (3) be vertically spaced apart 0.8m, horizontal spacing 0.8m, be advisable equidistantly to lay around pile body direction; Stop adopts precast concrete cushion block, size 10 × 5 × 10cm, as the stopping means of FRP basalt grid and PVC composite shuttering; In case FRP basalt grid and pile body, space between PVC composite shuttering are too small, setting is close together;
After the installation of basalt grid, water can be descended in place;
D, PVC composite shuttering is installed
Determine that PVC composite shuttering (6) adopts the thick PVC board of 1.0cm to make the column type template of internal diameter 1.9m height 3m according to disease incidence, FRP basalt grid underwater structures; For convenience of assembled, PVC composite shuttering is divided into four pieces high 1.5m semicolumn section mould plates, the flange that half and half column type template adopts PVC board bar to make coordinates high-strength bolt to connect, and for strengthening the rigidity of PVC composite shuttering, outside template, arranges one iron belt every 30cm;
PVC composite shuttering adopt prefabrication, prefabricated complete after, first carry out assembled examination, for subsequent use to job site through logistics transportation after examination;
After treating that bridge pier FRP basalt grid is in place, the on-site consolidation of PVC composite shuttering can be carried out;
First adopt hand fit Chain block, that head is saved PVC composite shuttering by wire rope is in place on operation platform, PVC composite shuttering is assembled to be completed to utilize high-strength bolt, pad to be saved by head, and iron belt is tightened in the outside of first joint PVC composite shuttering; Assembled complete after ensure first joint template end face be same level, be beneficial to the assembled of second section PVC composite shuttering;
Head is saved PVC composite shuttering submerged, to be positioned under operation platform till edge until its end face, to facilitate the assembled of second section PVC composite shuttering; Utilize artificial being moved to by second section PVC composite shuttering above first joint PVC compound die template, the bolt hole of alignment lateral connection flange, tights a bolt after penetrating bolt, then carries out the connection work of vertical adpting flange;
Second section PVC composite shuttering is assembled complete after, the assembled checking and accepting of whole PVC composite shuttering can be carried out; After examination, that carries out PVC composite shuttering enters water work in place;
When PVC composite shuttering enters water, utilize iron plate to make four suspension centres and be arranged symmetrically in middle and upper part outside second section PVC composite shuttering, sunk by Chain block lifting, the underwater guide of diver, basalt grid can be avoided and concrete pad sinks under water in place smoothly; Adopt weight such as straw bag parcel graded broken stone etc. template to be buried bottom PVC composite shuttering, running pulp when preventing concreting, buried depth is advisable with 30 ~ 40cm, buries underground two-layer inside and outside straw bag;
PVC composite shuttering is in place complete, through submarine inspection, after examination, can carry out underwater concreting work;
E, concreting
The concrete of perfusion adopts non-dispersible underwater concrete;
Concrete mixing adopts concrete mixer to carry out mix, often organizes duration of mixing and is about 10min;
Filling concrete adopts underwater grouting, utilizes the pvc pipe of 10cm × 4m to coordinate PVC funnel, joint etc. to make underwater grouting conduit; Conduit I and conduit II is inserted inside template respectively, pile foundation reinforcement region outside FRP basalt grid, apart from riverbed 10cm at the bottom of conduit; First carry out back cover to casting area in template to build, build height 10 ~ 15cm, in case during monobloc cast, it is excessive that pressure is born in substrate, causes the generation of frost boiling, template cracking phenomena bottom template;
Can formally build after 12h built by back cover; Consider mobility, self compacting ability in the water of non-dispersible underwater concrete, formally build and adopt DLC underwater grouting, be arranged symmetrically in pile foundation periphery by two cover conduits, pour into simultaneously;
The circular hole that the concrete mixed mixes feed hopper bottom through self-control flows into PVC funnel, pours into underwater pile reinforcing area through pvc pipe;
In filling process, according to filling concrete amount, depth of tremie situation, tube drawing, brachymemma process are carried out to conduit, make concrete buried depth be not more than 1.5 ~ 2m;
After concreting to design height, slowly upwards pull up conduit, until conduit ground is a little less than concrete surface, slow concreting is until underwater concrete overflows PVC composite shuttering; Extract conduit again, rely on concrete self mobility, self compacting ability, complete under water after Self-leveling, diver clears up PVC composite shuttering end face, outside concrete, makes that the concrete surface of newly building is smooth, clean outside template;
Health; Carry out health after concreting completes, treat that concrete strength acquires a certain degree rear collapsible die inspection;
In casting process, field fabrication concrete sample in the concrete mixed, health under on-the-spot synchronous condition, to be onstructed complete after 7d test specimen is taken back laboratory and carries out standard curing, and carry out the experiment of 7d, 28d concrete strength.
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| CN201510279538.5A CN104863063B (en) | 2015-05-28 | 2015-05-28 | Cofferdam method for rapidly reinforcing is exempted from based on the bridge submerged structure of PVC composite shuttering |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105113524A (en) * | 2015-09-09 | 2015-12-02 | 曹禹韬 | Rapid underwater cofferdam and construction method |
| CN105369771A (en) * | 2015-11-11 | 2016-03-02 | 安徽理工大学 | Underwater concrete building reinforcing method |
| CN106939559A (en) * | 2017-04-01 | 2017-07-11 | 核工业西南勘察设计研究院有限公司 | Strengthen the technological method for processing of installing pipe |
| CN108222089A (en) * | 2018-02-08 | 2018-06-29 | 中交四航工程研究院有限公司 | A kind of underwater wet method prosthetic device of concrete-pile defect and restorative procedure |
| CN108824228A (en) * | 2018-08-28 | 2018-11-16 | 南京林业大学 | A kind of method of bamboo combined housing reinforced bridge pier |
| CN112982923A (en) * | 2021-03-11 | 2021-06-18 | 西南交通建设集团股份有限公司 | Pile foundation construction platform |
| CN113481883A (en) * | 2021-07-17 | 2021-10-08 | 山东省高速路桥养护有限公司 | Reinforcing and reinforcing construction method for bridge underwater structure |
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| CN105113524A (en) * | 2015-09-09 | 2015-12-02 | 曹禹韬 | Rapid underwater cofferdam and construction method |
| CN105369771A (en) * | 2015-11-11 | 2016-03-02 | 安徽理工大学 | Underwater concrete building reinforcing method |
| CN106939559A (en) * | 2017-04-01 | 2017-07-11 | 核工业西南勘察设计研究院有限公司 | Strengthen the technological method for processing of installing pipe |
| CN108222089A (en) * | 2018-02-08 | 2018-06-29 | 中交四航工程研究院有限公司 | A kind of underwater wet method prosthetic device of concrete-pile defect and restorative procedure |
| CN108824228A (en) * | 2018-08-28 | 2018-11-16 | 南京林业大学 | A kind of method of bamboo combined housing reinforced bridge pier |
| CN112982923A (en) * | 2021-03-11 | 2021-06-18 | 西南交通建设集团股份有限公司 | Pile foundation construction platform |
| CN113481883A (en) * | 2021-07-17 | 2021-10-08 | 山东省高速路桥养护有限公司 | Reinforcing and reinforcing construction method for bridge underwater structure |
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