CN108951608A - Reinforce Diaphragm Wall Wharf underwater concrete structure construction engineering method - Google Patents

Abstract

The invention discloses reinforce Diaphragm Wall Wharf underwater concrete structure construction engineering method, including the following steps: marine organisms are cleared up in area to be repaired submarine inspection, area to be repaired, loose concrete chisel removal, underwater reinforcing bar repair welding reinforcing, underwater drilling are laid form tie, underwater formwork erection and sealing, underwater grouting and demoulding and checked and accepted in area to be repaired.Advantages of the present invention: having many advantages, such as that repairing and reinforcement is high-efficient, easy to operate, safe and reliable, and repairing and reinforcement effect is easy to that detection, repair materials intensity height, repair materials low cost, that damaged face cleaning efficiency is high, template support is solid and reliable, pressure grouting is guaranteed the quality is efficient.

Description

Reinforce Diaphragm Wall Wharf underwater concrete structure construction engineering method

Technical field

The present invention relates to underwater concrete structural strengthening and recovery technique field, in particular to reinforce Diaphragm Wall Wharf Underwater concrete structure construction engineering method.

Background technique

In recent years, diaphram wall sheet pile harbour due to its exclusive land construction, construction equipment is simple, speed of application Fastly, the relatively low a variety of advantages of small, cost being influenced by weather and being able to more application and development, the country mainly uses reinforcing bar Concrete ground connects wall construction, but since ground-connecting-wall wall construction is mainly constructed in underground excavation slot section, it will usually there is dew Two kinds of common quality defects of seam hidden danger of muscle and wall.It detects unit and underwater conventional detection is carried out to Jingdang Port ground-connecting-wall harbour When, it has been found that this kind of defect, or even there is local seam crossing rear stockyard filler leakage, there are larger security risk, while steel Muscle is exposed in the seawater, and corrosion rate is high, and the durability of reinforcing bar is unable to get guarantee, and eventually leading to wall stress not can guarantee.

Summary of the invention

The present invention is above-mentioned various in order to solve the problems, such as, provide a kind of repairing and reinforcement is high-efficient, easy to operate, safety can It leans on, the reinforcing Diaphragm Wall Wharf underwater concrete structure construction engineering method that repairing and reinforcement effect is easy to detect.

In order to solve the above technical problems, technical solution provided by the invention are as follows: reinforce the underwater coagulation of Diaphragm Wall Wharf Soil structure construction, including following construction procedure:

A, area to be repaired submarine inspection: at preliminary cleaning damaged area after marine organisms, the progress of subaqueous survey net is laid It measures and files measurement data；

B, marine organisms are cleared up in area to be repaired: according to data measured by step A, determining what marine organisms need to clear up Range is simultaneously cleaned out marine growth from area to be repaired using high-pressure rotary-spray jet apparatus, exposes concrete base layer；

C, loose concrete chisel removal in area to be repaired: 10 are relaxed to damaged area each side of the edge and is used to 15cm range Hydraulic pick carries out dabbing processing, is cut under water to concrete loose in restoring area using Hydraulic pick, edge uses Hydraulic chain saw carry out excision and it is straight；

D, underwater reinforcing bar repair welding is reinforced: first measure bar diameter, after design requirement is less than to diameter reinforcing bar be welded with New reinforcing bar operation；If reinforcing bar large area corrode, need it is prefabricated by land be welded into reinforced mesh, then hang in water with original steel Muscle net mutually welds；

E, underwater drilling lays form tie: hydraulic drilling device is used, is drilled on horizontal and vertical every 30cm, drilling Partial hole afterwards is implanted into an anchoring reinforcing bar, installation template mechanical swelling pull rod in another part hole；

F, formwork erection underwater formwork erection and sealing: is carried out using glued board when damaged area height is less than 1.5m；Work as damage zone Formwork erection is carried out using steel template when domain height is greater than 1.5m, being all made of the materials such as flitch, sealing brown piece, sealing cotton after formwork erection makes Formwork seal is good；

G, grout hole underwater grouting: is reserved and by Grouting Pipe from lower from template by Underwater Concrete mix conveying integrated machine Upper injection is inserted into bottom from the reserved grouting mouth in template top using by Grouting Pipe, and marginal not slurry side, which is promoted, is in the milk；

H, demoulding is checked and accepted: after underwater grouting completes 72h, underwater demolition template is carried out form tie protruding parts underwater Excision carries out preservative treatment to pull rod part exsertion part after excision.After being disposed, subaqueous survey net is laid again, to repairing Multiple outer dimension repetition measurement forms as-constructed plan record.

As an improvement, the subaqueous survey net is the dedicated subaqueous survey net of BND type and specification is 500mm × 500mm, institute The lower suspension for the subaqueous survey net stated is equipped with weight.

As an improvement, the surge of the high-pressure rotary-spray jet apparatus is 16 to 20MPa, band angle can be formed and cut Power removes marine organisms.

As an improvement, being adopted after the grouting material of reparation is not by dispersing flocculants, special-type grouting material and tap water match under water It is continuously stirred and is conveyed with dedicated Underwater Concrete mix conveying integrated machine and poured.

The advantages of the present invention over the prior art are that: repairing and reinforcement generallys use underwater formwork and carries out grouting reparation, The method has repairing and reinforcement high-efficient, easy to operate, safe and reliable, and repairing and reinforcement effect is easy to detect, and eliminating, underground is continuous There is very big economic benefit, environmental benefit and social benefit in terms of two kinds of common quality defects of wall dock structure；While the engineering method is also With repair materials intensity height, repair materials low cost, damaged face cleaning efficiency is high, template support is solid and reliable, pressure grouting It guarantees the quality the advantages that efficient.

Detailed description of the invention

Fig. 1 is the non-dispersible underwater concrete that the present invention reinforces Diaphragm Wall Wharf underwater concrete structure construction engineering method Underwater pouring shaping schematic view.

Specific embodiment

Present invention will be described in further detail below with reference to the accompanying drawings.

Technological principle of the invention: the cardinal principle for the repairing and reinforcement that is in the milk is by configuring the grouting of organic or inorganic Material is poured into crack or the hole of object to be reinforced using force feeds equipment such as grouting pumps using hydraulic principle, makes slurries in quilt Fill and permeate in carrier, spread, fill, be gelled and solidified after a certain period of time, the water of fault location and hole are squeezed exclude until Grouting material is filled in completely to be full of, thus the purpose of realizing antiseepage, leak stopping and reinforcing.Concrete operations technological principle is: passing through high pressure Whirl spraying fluidics is clean to marine growth thorough cleaning on the concrete surface and reinforcing bar of damaged area and restoring area to be reinforced, Followed by hydraulic diamond chain saw or Hydraulic pick to concrete loose around region, then punched by hydraulic drill embedded By dies plate tap after mechanical swelling pull rod, restoring area sealing is in the milk into restoring area, to under the conditions of test block reach design Demoulding inspection after intensity.

Specific implementation step of the invention:

A, area to be repaired submarine inspection: the mass defect region, that is, submerged structure damaged area provided according to detection unit Position, preliminary to clear up defect nearby after marine organisms, flaw size can be observed by reaching.It lays under BND type dedicated water Net is measured, survey grid is distributed using 500mm × 500mm grid, lower suspension weight, it is ensured that survey grid is along wall vertical run, net Lattice point of intersection reference mark point.Diver enters water, is recorded a video using underwater video recording to entire area to be repaired, is measured after video recording Deep three parameters of defect whole region length and width, draw defect area schematic diagram after water outlet, schematic diagram at least (should be embodied and be lacked comprising main view Fall into length and width dimensions) and sectional view (embodying depth of defect).Schematic diagram should by diver, after documenter and field engineer's signature and Video recording forms data backup, as final archive file.

B, marine growth is cleared up in area to be repaired: by first step process measurement data, determining marine growth cleanup area.It is logical Normal, marine growth will become important barrier of the repair materials with the guarantee of steel mesh bond stress and in conjunction with old metope, meanwhile, no Marine growth on reinforcing bar can be cleaned out, reinforcing bar will be unable to be passivated again under alkaline environment.Using high-pressure rotary-spray jet apparatus Band angle water flow cutting is formed in high speed whirl spraying using water, surge can be up to 16 to 20MPa, can by marine growth from Area to be repaired separates.The cleaning of high-pressure rotary-spray jet stream with high-efficient, clears up thorough advantage than conventional cleaning.

C, loose concrete chisel removal in area to be repaired: loose concrete is also a weight for influencing concrete repairing quality The rate-determining steps wanted relax 10 to damaged area each side of the edge and carry out dabbing processing using Hydraulic pick to 15cm range, to repairing Loose concrete is cut under water using Hydraulic pick in multiple region, edge using hydraulic chain saw carry out excision with it is straight.

D, underwater reinforcing bar repair welding is reinforced: if lower section, which has reinforcing bar to expose reinforcing bar simultaneously, has occurred and that corrosion, measurement reinforcing bar is straight Diameter, if steel area loss is smaller, diameter meets design requirement, and then be used directly original reinforcing bar, if original bar diameter is not Meet design requirement, then needs to be welded with new reinforcing bar on original reinforcing bar.If reinforcing bar large area is corroded, prefabricated weldering by land is needed Be connected into reinforced mesh, reinforcing bar arrangement of reinforcement when material with former diaphram wall steel mesh.Then the reinforced mesh that land fabrication is good It hangs in water, diver binds and welds with original reinforcing bar under water.Welding ensures effectively to weld with original steel mesh, guarantees new Continuity between old reinforced mesh.

E, underwater drilling lays form tie: hydraulic drilling device is used, in horizontal and vertical each 30cm drilling, drilling Partial hole is implanted into an anchoring reinforcing bar afterwards, on the one hand ensures the binding force in new-old concrete face, after on the other hand also can be used as Mend the drawknot node of reinforced mesh, installation template mechanical swelling pull rod in another part hole, drawknot node when to template support.It is above-mentioned After the completion of work, diver leaves and takes photologging using underwater video recording, retains as quality examination and concealment acceptance data.

F, underwater formwork erection and sealing: before selecting template, according to engineering experience and template bearing load capacity calculation, steel is chosen Two kinds of materials of pallet and glued board, damaged area height use glued board when being less than 1.5m；Damaged area height is greater than 1.5m Shi Caiyong steel template.

1) plywood form installs main points:

1. being installed using the technique that layering installs, is made and installed by actual repair area, every layer of template is most Big height 80cm, maximum width 200cm, two connection part of templates are reinforced using reinforcing strip.Template thickness is 10mm, in template Side brushing high polymer release agent, it is insoluble which meets water, it can be ensured that stripping result and does not influence institute's casting concrete Quality.

2. using channel steel reinforcing template on the outside of template to prevent template to be split up by concrete, channel steel length is larger than mould Board width, every 30cm install an emissions groove steel (channel steel model 10# channel steel), and template is fixed to be consolidated using the method for screwed connection It is fixed, by screw rod by being soldered to reinforcing bar, beat expansion bolt under water and be fixed on two methods in concrete and fix, then screw thread will be had The channel steel in hole is threadedly coupled with the screw rod fixed, can be by screw rod after the completion of concreting using detachable screw rod It removes, and removes the hole left after screw rod using same type of material reparation.

3. formwork erection is installed, it is higher by former ground-connecting-wall sea side 8cm on the inside of template, template is in damaged area surrounding 10cm is had more respectively, keeps formwork seal good using materials such as flitch, sealing brown piece, sealing cottons in the bottom surface of template and 2 sides It is good.

4. after template is installed, diving operation squad leader copes with the sealing situation of template surrounding and the weldering of channel steel, template Binding is connect to be checked, if the unqualified timely progress template reparation of discovery, and writing record and underwater camera are carried out, form money Material.

2) steel template installs main points

1. using plane combined steel formwork, template thickness 3mm, the high 55mm of rib, form height and length foundation are actually repaired Coverlay product carries out live processing.Every layer of steel form maximum height is 1.5m, maximum width 5m.Connection type between template is adopted With the U-shaped card of Ф 12.Brushing high polymer release agent on the inside of template, it is insoluble which meets water, it can be ensured that stripping result and The quality of institute's casting concrete is not influenced.Template to the progress mechanical grinding derusting of template outer surface, and on surface before use, apply Brush antirust agent coating, application process are land dry construction, and zinc content reaches 96% or more in dry coating, can possess with The same rust-proof effect of hot galvanizing, zinc and iron in film directly contact, and utilize electrochemical principle anti-corrosion.

2. vertically every 30cm, the reserved diameter of lateral every 100cm are observation fabrication hole 1 of 5cm to template, fabrication hole can be closed And unlatching, to observe grouting material casting situation.

It is fixed 3. template is fixed using the method for screwed connection, by screw rod by being soldered to reinforcing bar, playing expansion under water Bolt is fixed on two methods in concrete and fixes, then the rigid template with threaded bore is carried out screw thread company with the screw rod fixed It connects, using detachable screw rod, after remove screw rod after the completion of concreting, and after use same type of material reparation dismounting screw rod The hole left.After pull rod passes through template preformed hole, water stop gel ring is installed on pull rod, prevents grouting liquid from flowing from form tie hole Out, then the fixation tabletting of installation pull rod and nut, next use hydraulic spanner at the beginning of nut thoroughly fasten, it is ensured that peripheral water stopping adhesive tape With the complete gluing, sealing of metope.

4. formwork erection is installed, it is higher by former ground-connecting-wall sea side 10cm on the inside of template, template is in damaged area four Week has more 10cm respectively, makes formwork seal using materials such as flitch, sealing brown piece, sealing cottons in the bottom surface of template and 2 sides Well.

5. it is 4.5m that template maximum, which installs height, when there is the case where damaged height is greater than 4.5m, construct in batches.

After 6. template is installed, diving operation squad leader should the sealing situation to template surrounding check, if discovery Unqualified timely progress template replacement and reparation, and writing record and underwater camera are carried out, form data.

G, underwater grouting: the grouting material of reparation is by not dispersing flocculants under water: special-type grouting material: after tap water matches, After being continuously stirred using Special pulping equipment, grout hole is reserved by template by grouting pump and is injected from bottom to top by Grouting Pipe Or it is inserted into bottom from the reserved grouting mouth in template top using by Grouting Pipe, marginal not is starched side and is promoted.This grouting way is being repaired Original structure component strength grade can be higher than in terms of the intensity of position, while fluidity is relatively large, it is ensured that rejected region institute Some gaps are all filled, while being not necessarily to vibration compacting, Self-leveling, self-compaction.

H, demoulding is checked and accepted: after underwater grouting completes 72h, underwater demolition template is carried out form tie protruding parts underwater Excision carries out preservative treatment to pull rod part exsertion part after excision.After being disposed, lays surveyed under BND type dedicated water again Net is measured, to restoration contour size repetition measurement, forms as-constructed plan record, while being recorded a video under water, all data are by diver, data After member and field engineer sign and video recording forms data backup, as final archive file.

The material and equipment that the specific embodiment of the invention is used:

1. material

1) flocculant material specification and performance

2) grouting material material specification and performance

High Strength Non-shrinking Filling Material the key technical indexes

2. capital equipment

1) diving apparatus: screw air compressor, underwater video recorder, diving suit etc.

2) marine growth cleaning and grinding apparatus: underwater whirl spraying jet cleaning equipment, marine growth special shovel.

3) underwater concrete is cut and punch device: hydraulic workstation, hydraulic diamond chain saw, Hydraulic pick, hydraulic drill.

4) underwater reinforcement welding equipment: underwater electric welding machine and cutting machine

5) dies plate tap equipment: hydraulic spanner.

The quality of material and work progress of the present invention controls

1. Material quality control

1) selection of flocculant

When concrete works select additive, should according to the performance requirement of concrete, construction technology and weather conditions, in conjunction with The raw material property of concrete, match ratio and to factors such as the adaptability of cement, pass through to test and determine its kind and volume.No It should store, mark respectively with kind additive, must not be polluted when transport is with storage.

2) selection of grouting material

Carefully verification producer's product certificate and third party's examining report are needed when grouting material admission, are used and are said according to product Bright configuration is simultaneously sampled and is sent to laboratory inspection, and product can use after the assay was approved.

3) selection of reinforcing bar

When the entering of reinforcing steel bar, work certificate and Delivery Inspection Report should be checked, and carry out appearance by the regulation of relevant criterion And intensity sampling observation, it is ensured that quality is met the requirements.

2. work progress quality controls

1) underwater cleaning quality

Underwater cleaning quality is mainly recorded a video according to diver under water to be judged, because in conjunction with subaqueous survey net, for clear The range and cleaning quality of reason intuitively can calculate and see.Reinforcing bar will derust to ST2 grades, and especially marine organisms need It cleans out.

2) anchor bolt and template support inspection

After the completion of anchor bolt and template support, water is grown by operation group group and is checked, to the peace of anchor bolt Holding position and quantity are checked, while whether having been covered all damaged area and template to template range and having been repaired position original Structure fitting situation is checked, is allowed for access after passed examination and is constructed in next step.And writing record is formed simultaneously to inspection result Label take as data it is for future reference.

3) underwater grouting material match ratio inspection

The underwater grouting material product determined according to project carries out mix using match ratio, carries out before mix to material therefor amount It checks, mix can be carried out after meeting the requirements, while should check the actual conditions of mix material, not special conditions of contract Under the influence of, it must not arbitrarily adjust each material utilization amount in match ratio.

4) underwater grouting material strength checking

In order to be detected to underwater grouting material intensity, when being poured non-dispersible underwater concrete simultaneously preparation under water regardless of Concrete sample is dissipated, test method is detailed in:

1. underwater grouting material shaping method of specimen

Testing equipment:

A die trial size takes 150mmx 150mm x 150mm；

B standard curing room is not less than 95% controlled at (20 ± 2) DEG C, relative humidity, when there is no standard curing room, Test specimen allows to conserve in the hydrostatic of (20 ± 2) DEG C, and indicates in report；

C tank height can guarantee test during die trial top surface with headwater depth maintain 150mm, water tank length and width according to Test it needs to be determined that.

Underwater molded test step:

The die trial of underwater molding is placed in water tank by a, and water is added to the die trial top surface with headwater depth 150mm, keeps it Water temperature is in (20 ± 2) DEG C；

B is poured into die trial, each inventory is examination for shoveling underwater grouting material mix from falling from the water surface into water 1/10 or so of mould volume, continuous dosing are 0.5-lmin, underwater pouring to die trial surface, the charging time of each die trial is exceeded Method is as shown in Fig. 1；

C takes out die trial from water, stands 5-l0min；

D promotes draining with two sides that wooden mallet touches die trial, is then placed back into water；

E is smoothed out before initial set with spatula beyond the concrete of die trial, is placed 2d demoulding, is carried out standard curing in water, Certain distance is kept between test specimen, each age is with 3 test specimens for one group；

F takes out test specimen from water when reaching predetermined age, is tested.

2. land molded test step:

The die trial of land molding is placed in air by a, and room temperature should be maintained at (20 ± 2) DEG C；

B is for shoveling grouting material mix does not pour into die trial continuously under water, and continuous dosing is to die trial surface is exceeded, each The skill material time of die trial is 0.5-lmin；

C is smoothed out before initial set with spatula beyond the concrete of die trial, is placed 2d demoulding, is carried out standard curing in water, Certain distance should be kept between test specimen, each age is with 3 test specimens for one group；

D takes out test specimen test when reaching predetermined age from water.

3. non-dispersible underwater concrete land and water compressive strength rate measuring method

Testing equipment should meet following requirements:

The test error of indication of a pressure testing machine is not more than ± the 2% of standard value；

B pressurization back plate sizes are had a competition, and part pressure-bearing surface is slightly larger, and surface smoothness is within 0.02mm；

C die trial size takes 150mmx 150mm x 150mm.

Test should follow these steps to carry out:

A test specimen when maintenance to regulation age, prevents from doing after taking out in water in the water of (20 ± 2) DEG C with wet cloth covering It is dry；

By test specimen wiped clean before b test, appearance is measured size and checked, sample dimensions measurement is accurate to lmm；

The center of the upper and lower end face of c test specimen is directed at the center of upper lower platen, and testing machine pressing plate and test specimen compression face coincide；

Continuously and uniformly until test specimen destroys, loading speed is determined according to test piece intensity for loading when d is tested, and strength grade is small Take 0.3-0.5MPa/s when C30, when C30 or more takes 0.5-0.8MPa/s.

Test result calculates:

A concrete crushing strength is calculated as follows:

F in formula_cuOne concrete crushing strength (MPa), calculating are accurate to 0.1MPa；

Mono- failing load of P (kN)；

Mono- test specimen bearing area (mm2) of A.

B compression strength value takes the arithmetic mean of instantaneous value of 3 test piece intensities of group.When the maximum value in 3 test piece intensities or most When the difference of small value and median is more than the 15% of median, median is taken；When in 3 test piece intensities maximum value and minimum value with When the difference of median is more than the 15% of median, this group of test result is cancelled；

The land and water c compressive strength rate is the ratio of underwater shaping test piece compression strength and land shaping test piece compression strength, meter It calculates result and is accurate to 1%.

5) repairing quality inspection

Measurement net video recording twice, the i.e. comparison of reparation antero-posterior extent can be compared to the inspection of repair coverage.

Appearance can be checked by video recording by repairing grouting material Forming Quality.

Intensity carries out mechanical property inspection by core boring sampling.

Claims (4)

1. reinforcing Diaphragm Wall Wharf underwater concrete structure construction engineering method, it is characterised in that: including following construction procedure:

A, it area to be repaired submarine inspection: at preliminary cleaning damaged area after marine organisms, lays subaqueous survey net and measures And measurement data is filed；

B, marine organisms are cleared up in area to be repaired: according to data measured by step A, determining the range that marine organisms need to clear up And cleaned out marine growth from area to be repaired using high-pressure rotary-spray jet apparatus, expose concrete base layer；

C, 10 loose concrete chisel removal in area to be repaired: are relaxed to 15cm range using hydraulic to damaged area each side of the edge Pick carries out dabbing processing, is cut under water to concrete loose in restoring area using Hydraulic pick, edge is using hydraulic Chain saw carry out excision and it is straight；

D, underwater reinforcing bar repair welding is reinforced: first measure bar diameter, after design requirement is less than to diameter reinforcing bar carry out being welded with new steel Muscle operation；If reinforcing bar large area corrode, need it is prefabricated by land be welded into reinforced mesh, then hang in water with original steel mesh Mutually weld；

E, underwater drilling lays form tie: using hydraulic drilling device, drills on horizontal and vertical every 30cm, after drilling Partial hole is implanted into an anchoring reinforcing bar, installation template mechanical swelling pull rod in another part hole；

F, formwork erection underwater formwork erection and sealing: is carried out using glued board when damaged area height is less than 1.5m；When damaged area height Formwork erection is carried out using steel template when degree is greater than 1.5m, being all made of the materials such as flitch, sealing brown piece, sealing cotton after formwork erection makes template Good seal；

G, underwater grouting: grout hole is reserved from template by Underwater Concrete mix conveying integrated machine and is infused from bottom to top by Grouting Pipe Enter or be inserted into bottom from the reserved grouting mouth in template top using by Grouting Pipe, marginal not slurry side, which is promoted, is in the milk；

H, demoulding is checked and accepted: after underwater grouting completes 72h, underwater demolition template cuts off form tie protruding parts under water, Preservative treatment is carried out to pull rod part exsertion part after excision.After being disposed, subaqueous survey net is laid again, to restoration contour Size repetition measurement forms as-constructed plan record.

2. reinforcing Diaphragm Wall Wharf underwater concrete structure construction engineering method according to claim 1, it is characterised in that: The subaqueous survey net is the dedicated subaqueous survey net of BND type and specification is 500mm × 500mm, the subaqueous survey net Lower suspension is equipped with weight.

3. reinforcing Diaphragm Wall Wharf underwater concrete structure construction engineering method according to claim 1, it is characterised in that: The surge of the high-pressure rotary-spray jet apparatus is 16 to 20MPa, can form band angle cutting force and remove marine organisms.

4. reinforcing Diaphragm Wall Wharf underwater concrete structure construction engineering method according to claim 1, it is characterised in that: After the grouting material of reparation is not by dispersing flocculants, special-type grouting material and tap water match under water, using dedicated Underwater Concrete mix Conveying integrated machine is continuously stirred and is conveyed and pours.