CN1635223A - Bridge cofferdam waterstop construction process - Google Patents
Bridge cofferdam waterstop construction process Download PDFInfo
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- CN1635223A CN1635223A CN 200310122854 CN200310122854A CN1635223A CN 1635223 A CN1635223 A CN 1635223A CN 200310122854 CN200310122854 CN 200310122854 CN 200310122854 A CN200310122854 A CN 200310122854A CN 1635223 A CN1635223 A CN 1635223A
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- air bag
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Abstract
The invention relates to a bridge cofferdam water stopping construction technique, comprising: making water stopping air-bag, opening a handle hole, mounting the water stopping air-bag, adjusting the air-bag to the suitable position, detecting the gas tightness of the air-bag, inflating the air-bag, processing keep-together cement slurry pressing injection utilizing the air-bag as template, employing pressing injection for 2~3 times and reserving until the water stopping is finished. The invention has advantages of easily operation, high efficiency, low cost, especially adapted to the bridge cofferdam water stopping construction under environmental extremes.
Description
Technical field
What the present invention relates to is a kind of bridge foundation construction technology, and particularly a kind of prefabricated casing cushion cap sealing construction technology belongs to building engineering field.
Background technology
At present, often adopt prefabricated cofferdam construction method in the bridge construction, the cofferdam sealing adopts usually in construction: at execution conditions not too under the complicated situation, by the stifled space of diver's underwater operation, cast does not disperse concrete under water or adopts the expanded rubber leak stopping, perhaps carries out the job practices of the shutoff of Polyurethane foaming under water.The subject matter that the job practices of prior art exists is for the abominable engineering of execution conditions, because wave is high, current are anxious, differential water pressures is big, cause the situation that efficiency of construction is low, the shutoff sealing is failed to occur easily, and it is bigger for the sealing hole, construct under the situation of the darker inconvenient workman's underwater operation of hole, construction period is longer, construction cost is very high.Particularly the job site is positioned at certain sea, the depth of water reaches about 11 meters, head difference reaches 5 meters, and need the pore size inequality of sealing, width does not wait from 1～14 meter, needs sealing place be about 12 meters away from deck, and personnel can not direct control, adopt existing common job practices to be difficult to reach the stagnant water effect of expection, directly have influence on the construction of bridge.
Summary of the invention
The present invention is directed to the deficiencies in the prior art and defective, a kind of bridge cofferdam sealing construction technology under severe construction conditions is provided, its easy construction, efficiency of construction height, construction cost are low, under the construction environment that differential water pressures is big inside and outside big for hole especially, the hole good cofferdam sealing construction effect are arranged.
The present invention is achieved by the following technical solutions, and concrete construction technology of the present invention is as follows:
(1) making of sealing air bag;
(2) offer handle hole, the sealing air bag is installed;
(3) adjust air bag to the appropriate location, check the air bag tightness, airbag aeration;
(4) utilize air bag to serve as template action, carry out not dispersed cement slurry pressure injection;
(5) adopt 2～3 mud jacking, and maintain to sealing and finish.
Below the present invention is described in further detail:
(1) preparation method of sealing air bag is specific as follows:
Adopt the banded airtight air bag of Ferrari 502/8100 material; Bond by ten suspension ring of Ferrari 502/8100 material with PVC Instant cement disposed at equal distance on the air bag.
(2) offer handle hole, the method that the sealing air bag is installed is specific as follows:
Circumference is offered several handle holes in upper edge, drilled pile catheter wall appropriate location, in handle hole, air bag is pierced in the space of conduit and casing, suspension ring are adjusted to the handle hole position, overlapping the opening with iron wire of the suspension ring of balloon ends tightened, paste with sponge-rubber pad in the scope of air bag end, the upper limb of air bag withstands with the roof pressure reinforcing bar.
(3) adjust air bag to the appropriate location, check the air bag tightness, specific as follows to the method for airbag aeration:
With there being the scale iron wire to connect air bag, the air bag bottom utilizes the scale iron wire evenly to transfer simultaneously with hanging counterweight, and with the degree of depth that scale control is transferred, air bag is put into assigned address, and the upper limb of air bag withstands with the roof pressure reinforcing bar.To airbag aeration, the air bag tightness is checked in pressurize, and air bag finally is inflated to 0.28Mpa with air compressor machine.
(4) utilize air bag to serve as template action, the method for carrying out dispersed cement slurry pressure injection not is specific as follows:
Dispersed cement slurry does not stir with No. 425 cement by the match ratio of Admixture (HLC-IV) volume of 0.5 water/binder ratio and 9% under water, close air bag top, madjack pipe position.
(5) adopt 2～3 mud jacking, and it is specific as follows to maintain the method for finishing to sealing:
Adopt 2～3 times mud jacking, the time interval of per twice mud jacking is no less than 20 hours, and maintains to sealing and finish, and keeps the air bag internal gas pressure constant therebetween.
The present invention has substantive distinguishing features and marked improvement, and is with strong points, is specially adapted under the adverse circumstances bridge cofferdam sealing construction.Adopt construction technology of the present invention to carry out sealing construction, easy construction, efficient height, cost are low, especially under the excessive execution conditions of differential water pressures, have good sealing construction effect inside and outside big for hole, the hole, solved the deficiency and the defective of existing construction technology.
Description of drawings
Fig. 1 to Fig. 3 is a cofferdam of the present invention sealing construction process schematic representation;
Fig. 4 is that sealing construction used air bag in cofferdam of the present invention is made schematic diagram.
The specific embodiment
With certain bridge cofferdam sealing construction is that the present invention is described in further detail in conjunction with the accompanying drawings for example.
Certain bridge respectively has 38 bored piles at its (pm335, pm336) main pier, and the casing of double-walled steel cofferdam as operation platform and construction adopted in construction.In the double-walled steel cofferdam, the drilled pile casing is to set in the conduit of reserving on steel besieges the weir, and the shutoff sealing construction is to carry out in the annular space between casing and conduit, and institute's shutoff sealing scope is flooded in water always.For overcoming above-mentioned difficulties, the cofferdam sealing construction technology of employing, step is: air bag making-scene preparation-air bag installation-airbag aeration-under water is the dispersed cement slurry pressure injection not.
(1) making of air bag (as shown in Figure 4): adopt Ferrari 502/8100 material to make long 10.3m, the footpath is 20 banded airtight air bag 1; Use ten suspension ring 2 of 10 bondings of PVC Instant cement disposed at equal distance on the air bag 1, and prepare the first-class accessory kit of valve, tracheae and pipe clamp by Ferrari 502/8100 material.
(2) the on-the-spot preparation: on-the-spot preparation mainly contains: air bag 1 constructing operation hole is set up, opened to the configuration of material and facility, construction pin hand on conduit 3 walls.The pin hand of wherein constructing sets up on conduit+and 3.00 positions set up ease of Use pin hand with shaped steel and springboard; Open air bag 1 handle hole: on catheter wall+3.20 positions open 8 handle holes along circumference, and handle hole size 400 * 400 also is uniformly distributed along the circumference.
(3) air bag is installed (as shown in Figure 1): in handle hole air bag pierced in the space of conduit 3 and casing, suspension ring 2 are adjusted to the handle hole position, the suspension ring 2 at air bag 1 two ends are overlapping and tighten with iron wire 4, and air bag 1 end scope is interior pastes with sponge-rubber pad.Ring connects graduated iron wire 4 on air bag suspension ring 2, hangs up counterweight steel plate 9 at the following ring of suspension ring 2; The valve of air bag 2 is connected with air inlet pipe 6 and clamps with the tracheae chuck, the other end of tracheae 6 is connected with air gauge 6 and air compressor machine 7 with threeway.Adjust air bag 1 position (as shown in Figure 2), 8 have scale iron wire 4 evenly to transfer simultaneously, and the degree of depth of transferring with scale control is put into assigned address (air bag 1 lower edge apart from cofferdam at the bottom of 30mm) with air bag 1, and iron wire 4 is tightened near handle hole; Inject roof pressure reinforcing bar 8 from handle hole, the upper limb of air bag 1 is withstood in the end, roof pressure reinforcing bar 8 is welded on (as shown in Figure 3) on the casing after very good.
(4) airbag aeration: air bag 1 final the blowing pressure is 0.28Mpa, controls air bag 1 internal gas pressure with pressure meter 6, valve during on-the-spot the inflation.Utilize air compressor machine 7 keep air bags 1 internal gas pressure (0.2Mpa～～0.28Mpa) 48 hours, in case air bag 1 long-time gas leakage and do not play the rest cement paste.
(5) dispersed cement slurry pressure injection not under water
Cement paste water/binder ratio 0.5, cement adopts No. 425 cement, Admixture (HLC-IV) volume 9%.Do not disperse clean slurry in suitable mortar mixer, to prepare under water, the accurately weighing in proportion of cement, Admixture and water, cement and HLC-IV concrete underwater undispersing agent are done the companion earlier evenly, add water again and stir.Cement paste often stirs before use with in the mud jacking process, and the slurry that stirs generally should use up in 30-40min.Mud jacking can adopt piston type mortar pump or squeeze mortar pump, and slurry was wanted screen cloth before from the mixer to the mudjack, removed coarse granule, blocked mudjack with face.
Madjack pipe is arranged: be full of the gap of conduit 3 and casing for guaranteeing slurry, should arrange four madjack pipes on the annulus of gap, stamp should be tried one's best near air bag 1 top under the madjack pipe, and energy while mud jacking, and the slurry face is evenly risen.Before the beginning mud jacking madjack pipe is full of in advance and does not disperse clean slurry under water.Because in the forming process, slurry is drainage subsidence gradually, the mud jacking amount should exceed requirement height about 10% to the slurry face.Inject three to four madjack pipes in from the casing top toward the space, divide two to three times the pressure injection cement paste, the time interval of twice mud jacking is no less than 20 hours, and maintains to sealing and finish, and will keep air bag 1 internal gas pressure constant therebetween.
Claims (6)
1. bridge cofferdam sealing construction technology is characterized in that concrete technology is as follows:
(1) making of sealing air bag;
(2) offer handle hole, the sealing air bag is installed;
(3) adjust air bag to the appropriate location, check the air bag tightness, airbag aeration;
(4) utilize air bag to serve as template action, carry out not dispersed cement slurry pressure injection;
(5) adopt 2～3 mud jacking, and maintain to sealing and finish.
2. this bridge according to claim 1 cofferdam sealing construction technology is characterized in that the preparation method of sealing air bag is specific as follows: adopt the banded airtight air bag (1) of Ferrari 502/8100 material; Air bag (1) is gone up with ten suspension ring (2) of PVC Instant cement disposed at equal distance bonding by Ferrari 502/8100 material.
3. this bridge according to claim 1 cofferdam sealing construction technology, it is characterized in that offering handle hole, the method that the sealing air bag is installed is specific as follows: circumference is offered several handle holes in upper edge, drilled pile conduit (3) wall appropriate location, in handle hole, air bag (1) is pierced in the space of conduit (3) and casing, suspension ring (2) are adjusted to the handle hole position, overlapping the opening with iron wire (4) of the suspension ring at air bag (1) two ends tightened, paste with sponge-rubber pad in the scope of air bag (1) end.
4. this bridge according to claim 1 cofferdam sealing construction technology is characterized in that adjusting air bag to the appropriate location, checks the air bag tightness, and is specific as follows to the method for airbag aeration:
With there being scale iron wire (4) to connect air bag (1), air bag (1) bottom utilizes scale iron wire (4) evenly to transfer simultaneously, and controls the degree of depth of transferring with scale with hanging counterweight, air bag (1) is put into assigned address, and the upper limb of air bag (1) withstands with roof pressure reinforcing bar (8).To air bag (1) inflation, air bag (1) tightness is checked in pressurize, and air bag (1) finally is inflated to 0.28Mpa with air compressor machine (7).
5. this bridge according to claim 1 cofferdam sealing construction technology is characterized in that utilizing air bag to serve as template action, and the method for carrying out dispersed cement slurry pressure injection not is specific as follows:
Dispersed cement slurry does not stir with No. 425 cement by the match ratio of Admixture (HLC-IV) volume of 0.5 water/binder ratio and 9% under water, close air bag (1) top, madjack pipe position.
6. this bridge according to claim 1 cofferdam sealing construction technology, it is characterized in that adopting mud jacking 2～3 times, and it is specific as follows to maintain the method for finishing to sealing: adopt 2～3 times mud jacking, the time interval of per twice mud jacking is no less than 20 hours, and maintain to sealing and finish, keep air bag (1) internal gas pressure constant therebetween.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310122854 CN1635223A (en) | 2003-12-26 | 2003-12-26 | Bridge cofferdam waterstop construction process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310122854 CN1635223A (en) | 2003-12-26 | 2003-12-26 | Bridge cofferdam waterstop construction process |
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|---|---|
| CN1635223A true CN1635223A (en) | 2005-07-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200310122854 Pending CN1635223A (en) | 2003-12-26 | 2003-12-26 | Bridge cofferdam waterstop construction process |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1837511B (en) * | 2006-04-07 | 2010-06-02 | 上海市政工程设计研究总院 | Double-rowed cofferdam and method for manufacturing the same |
| CN101812841A (en) * | 2010-02-10 | 2010-08-25 | 郭振国 | Conduit for pile casting of pile foundation engineering |
| CN102518146A (en) * | 2011-11-18 | 2012-06-27 | 钟爱民 | Connecting way of cofferdam and bearing platform |
| CN102828521A (en) * | 2012-08-16 | 2012-12-19 | 中交第二航务工程局有限公司 | Underwater water-stopping method for precast pile caps |
| CN102852094A (en) * | 2012-08-31 | 2013-01-02 | 中交第二航务工程局有限公司 | Construction method for prefabricating composite structure of pier mounting plate pile under open marine environment |
| CN103015441A (en) * | 2012-12-06 | 2013-04-03 | 上海市基础工程有限公司 | Floating water stop device for bridge bearing platform or construction platform |
| CN104631479A (en) * | 2014-12-23 | 2015-05-20 | 中冶天工集团有限公司 | Soil-removal-and-replacement stirring method for constructing waterproof curtain |
| CN105735332A (en) * | 2014-12-23 | 2016-07-06 | 中冶天工集团有限公司 | Soil changing mixing waterproof curtain construction method based on pebbles |
-
2003
- 2003-12-26 CN CN 200310122854 patent/CN1635223A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1837511B (en) * | 2006-04-07 | 2010-06-02 | 上海市政工程设计研究总院 | Double-rowed cofferdam and method for manufacturing the same |
| CN101812841A (en) * | 2010-02-10 | 2010-08-25 | 郭振国 | Conduit for pile casting of pile foundation engineering |
| CN102518146A (en) * | 2011-11-18 | 2012-06-27 | 钟爱民 | Connecting way of cofferdam and bearing platform |
| CN102828521A (en) * | 2012-08-16 | 2012-12-19 | 中交第二航务工程局有限公司 | Underwater water-stopping method for precast pile caps |
| CN102828521B (en) * | 2012-08-16 | 2014-09-10 | 中交第二航务工程局有限公司 | Underwater water-stopping method for precast pile caps |
| CN102852094A (en) * | 2012-08-31 | 2013-01-02 | 中交第二航务工程局有限公司 | Construction method for prefabricating composite structure of pier mounting plate pile under open marine environment |
| CN102852094B (en) * | 2012-08-31 | 2015-03-18 | 中交第二航务工程局有限公司 | Construction method for prefabricating composite structure of pier mounting plate pile under open marine environment |
| CN103015441A (en) * | 2012-12-06 | 2013-04-03 | 上海市基础工程有限公司 | Floating water stop device for bridge bearing platform or construction platform |
| CN104631479A (en) * | 2014-12-23 | 2015-05-20 | 中冶天工集团有限公司 | Soil-removal-and-replacement stirring method for constructing waterproof curtain |
| CN105735332A (en) * | 2014-12-23 | 2016-07-06 | 中冶天工集团有限公司 | Soil changing mixing waterproof curtain construction method based on pebbles |
| CN104631479B (en) * | 2014-12-23 | 2016-08-31 | 中冶天工集团有限公司 | The construction method of the water-stop curtain of soil removal and replacement stirring |
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