CN106939555A - A kind of Maintenance in Winter method of slug matching box girder construction - Google Patents
A kind of Maintenance in Winter method of slug matching box girder construction Download PDFInfo
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- CN106939555A CN106939555A CN201710169208.XA CN201710169208A CN106939555A CN 106939555 A CN106939555 A CN 106939555A CN 201710169208 A CN201710169208 A CN 201710169208A CN 106939555 A CN106939555 A CN 106939555A
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- box beam
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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
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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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
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
- E01D2/04—Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/24—Safety or protective measures preventing damage to building parts or finishing work during construction
- E04G21/246—Safety or protective measures preventing damage to building parts or finishing work during construction specially adapted for curing concrete in situ, e.g. by covering it with protective sheets
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- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
A kind of Maintenance in Winter method of slug matching box girder construction of the present invention, belongs to engineering construction field, it is step（1）Pour box girder webs, step（2）Pour box beam top board isothermal holding, step（3）After pouring box beam intensity and reaching requirement, box beam will be poured and move to matched position, as matching box beam, and pouring place's repeat step（1）、（2）Make and new pour box beam；Step（4）Match box beam isothermal holding, step（5）After temperature is reached in stay-warm case, the multi-layer heat preserving on stay-warm case, matching box back plate is handled and removed, matching box beam is met after room temperature lifting, and the new box beam that pours is passed through into step（3）It is used as new matching box beam, subsequent repeat step（4）、（5）, so as to complete the Maintenance in Winter of slug matching box girder construction.Using the technical program so that box beam surface is not likely to produce contraction crack, quality is guaranteed, while box beam is set rationally, simply during construction and maintenance, saves the duration.
Description
Technical field
The present invention relates to Construction Technology field, more specifically to a kind of winter of slug matching box girder construction
Season maintenance process.
Background technology
In concrete construction, construction quality is limited by environment temperature, particularly winter construction, because environment temperature is low,
Larger is influenceed on whole construction and maintenance, quality etc.；Temperature and humidity is should ensure that in its maintenance processes after concrete cast, if protected
Shield measure is not in place, by low temperature effect, and the hydration of cement is hindered, and the free moisture in concrete starts to freeze, body
Product increase, then easily cause concrete cracking, have a strong impact on construction quality.It is less than 5 within continuous 5 days when outdoor daily mean temperature
DEG C when, that is, belong to winter construction, the northern area of China height above sea level is higher, dry, there is strong wind weather throughout the year, winter construction basis
Maintenance is particularly critical.
At present, the maintenance of winter construction box beam is more is warmed up using building canopy, and uses in brooder the heat temperature raisings such as coal stove, maintenance
Period domestic demand consumes the fuel such as substantial amounts of oil, coal, while moisturizing equipment need to be set to keep the humidity in brooder, adds work people
There is certain potential safety hazard in member's labor intensity, work progress, while box girder construction is long in time limit, box beam surface, which is also easy to produce, to be split
Line, surface quality is poor.
Through retrieval, Chinese Patent Application No.：2012105847405, the applying date：On December 30th, 2012, innovation and creation name
Referred to as：Prefabricated box -beam steam curing equipment and health-preserving method.Northern China winter temperature is relatively low, but the prefabricated limit of many bridge beam slabs
In construction period, it is necessary to carry out winter construction.Under low-temperature condition, the low intensity of concrete formation, the date of template turnover is long,
It is unfavorable for improving prefabricated box -beam construction speed.The composition of this application case includes：Be provided with inside box beam, box beam steam curing pipe,
Temperature control sensing element, steam curing pipe is connected by jet chimney with steam engine, and temperature control sensing element is connected with thermometric instrument.Should
Application case is used for prefabricated box -beam steam curing, but this application case temperature control sensing element is in wet environment susceptible, easily to construction
Progress brings influence.
Chinese Patent Application No.：2008100449994, the applying date：On March 17th, 2008, invention and created name is：It is prefabricated
Beam curing means and its maintenance process, this application case are related to a kind of precast beam maintaining apparatus, and the device is by steam-cured frame and covering
In the curing cover of the tarpaulin composition of frame surrounding, frame includes setting temperature control device in rigid backbone and cover plate, curing cover and added
Wet device, temperature control device includes temperature-adjusting device and temperature measuring equipment；This application case further relates to the maintenance process of precast beam,
The curing temperature of moisture-heat preservation is controlled at 30-35 DEG C, and watering ensures that concrete surface keeps moistening；Using the device of this application case
And maintenance process, conveniently, during maintenance, temperature difference between inside and outside concrete is small, and concrete strength develops for lifting, and the internal model dismounting time carries
Before, accelerating construction progress improves efficiency of construction, it is ensured that prefabricated box -beam quality, while cost has been saved, but the construction of this application case
Efficiency is low.
The content of the invention
1. the invention technical problem to be solved
It is an object of the invention to overcome in the prior art box girder construction it is long in time limit, box beam surface is also easy to produce crackle, surface quality
The deficiency of poor the problems such as is there is provided a kind of Maintenance in Winter method of slug matching box girder construction, using the technical side of the present invention
Case make it that box beam surface is not likely to produce contraction crack, and surface quality is guaranteed, while box beam is set during construction and maintenance
Rationally, simply, the duration is saved.
2. technical scheme
To reach above-mentioned purpose, the technical scheme that the present invention is provided is：
A kind of Maintenance in Winter method of slug matching box girder construction of the present invention, it is in short-term matching box girder prefabricated pedestal
Maintenance process,
Its step is as follows：
Step（1）Pour box girder webs：At the place of pouring, progress pours box girder webs, and it pours box girder formwork and is steel form, and
The all standing of steel form outer surface has insulation material, while inserting thermometer in steel form insulation material；
Step（2）Pour box beam top board isothermal holding：Multi-layer heat preserving processing is carried out pouring box beam top board, and in top board and multilayer
Insertion thermometer in the cotton-wadded quilt of insulation, 35h ~ 40h isothermal holding is carried out to pouring box beam；
Step（3）Match box beam：After pouring box beam intensity and reaching the 50% of design requirement, steel form thereon is removed, then will
Pour box beam and move to matched position, the matching box beam constructed as slug matching, and pouring place's repeat step（1）, step
（2）Operation make and new pour box beam；
Step（4）Match box beam isothermal holding：Matching box beam is put into stay-warm case, and utilizes electricity steaming of the rated power for 48KW
Boiler furnace carries out steam insulation, and the place suspension that steam does not reach in the matching flange plate of box beam, inner chamber to matching box beam
Thermometer, when box beam intensity to be matched reaches the 80% of design requirement, the vapor (steam) temperature being passed through in stay-warm case is diminished step by step, most
Electric steam boiler is turned off afterwards；
Step（5）Match box beam lifting：After uniform temperature is reached in stay-warm case, stay-warm case is removed, and by matching box back
Multi-layer heat preserving processing on plate is removed, after the temperature of box beam to be matched reaches that room temperature is lifted by crane, and the new box beam that pours is passed through
Step（3）After move to matched position, the new matching box beam constructed as slug matching, subsequent repeat step（4）, step
（5）, so as to complete the Maintenance in Winter of whole slug matching box girder construction.
As further improvement of the present invention, the step（1）In insulation material be rubber-plastic sponge.
As further improvement of the present invention, the step（2）In multi-layer heat preserving be processed as pouring box beam first
Cover top surface sprays curing fluid, makes its cover top surface formation diaphragm, and the geotextiles for reusing moistening are covered, then
Layer of plastic film is covered again, and last all standing cotton-wadded quilt is incubated.
As further improvement of the present invention, the step（2）The thickness of middle geotextiles is 3 mm ~ 4mm.
As further improvement of the present invention, the step（4）Match in box beam isothermal holding, electric jet chimney is equal
It is even to be arranged in matching box beam bottom and inner chamber, and air-locked waterproof cloth is used as the stay-warm case of matching box beam.
As further improvement of the present invention, the step（4）Matching box beam isothermal holding include heating, constant temperature,
Cool three phases：
Temperature rise period：The temperature in stay-warm case is risen to 15 DEG C ~ 20 DEG C first in 40min ~ 50min, then 50min ~
The temperature in stay-warm case is risen to 25 DEG C ~ 30 DEG C in 70min；
The constant temperature stage：Matching box beam insulation is carried out using 80% ~ 90% relative humidity, 25 DEG C ~ 30 DEG C of temperature in stay-warm case,
Soaking time is 28 h ~ 32h；
Temperature-fall period：The temperature in stay-warm case is down to 15 DEG C ~ 20 DEG C first in 50min ~ 70min, then 40min ~
The temperature in stay-warm case is down to 4 DEG C ~ 5 DEG C in 50min.
It is used as further improvement of the present invention, step（5）In after insulation case temperature be reduced to 4 DEG C ~ 5 DEG C after, will protect
Temperature cover is removed, and removes the isothermal holding on matching box back plate.
3. beneficial effect
The technical scheme provided using the present invention, compared with prior art, with following remarkable result：
（1）A kind of Maintenance in Winter method of slug matching box girder construction of the present invention, carries out box beam by slug matching and applies
Work simultaneously carries out Maintenance in Winter to it, after pouring box beam intensity and reaching the 50% of design requirement, you can satisfaction will pour box beam and move to
Matched position, the matching box beam constructed as slug matching, and the matching box beam positioned at matched position now ought be met
Its intensity, which reaches, can be met during the 80% of design requirement that lifting is required, can so move to the box beam that pours at cast
Matched position, the new matching box beam constructed as slug matching, and the new box beam that pours can be poured into a mould at cast, with
Just new can be poured box beam as matching box beam, box beam, the conversion of matching box beam mutual alignment is poured like this, is exactly based on
Rational isothermal holding is carried out to pouring box beam, matching box beam, makes to pour box beam, matching box beam just and meets slug matching
A construction requirement, while pour the isothermal holding process of box beam has good in time with matching the isothermal holding process of box beam
Linking, that is, when pouring box beam intensity and reaching the 50% of design requirement, matching box beam meets its intensity and reaches design requirement just
When 80% lifting requirement, and pour box beam to match box beam only need maintenance 3 ~ 4 days, you can meet matching box beam lifting, significantly
The efficiency of construction of box beam is improved, this process sets reasonable, the duration is saved, while ensure that the quality of box beam.
（2）A kind of Maintenance in Winter method of slug matching box girder construction of the present invention, wherein, by pouring box beam top
Plate upper surface is sequentially provided with diaphragm, the geotextiles of moistening, layer of plastic film, cotton-wadded quilt, first with the diaphragm of curing fluid
Conserved to pouring box beam top board, the geotextiles for reusing moistening carry out moistening processing to pouring box beam top board, then utilize
Layer of plastic film carries out moisturizing processing to pouring box beam top board, is carried out finally by cotton-wadded quilt to pouring box beam top board at insulation
Reason, the present invention is handled by maintenance, moisturizing, the combination of three aspects of insulation, is effectively guaranteed the quality for pouring box beam top board,
Avoid the appearance for pouring crackle on box beam top board.
Embodiment
To further appreciate that present disclosure, the present invention is described in detail in conjunction with the embodiments.
Embodiment 1
A kind of Maintenance in Winter method of slug matching box girder construction of the present embodiment, it is in short-term matching box girder prefabricated pedestal
Interior maintenance process,
Its step is as follows：
Step（1）Pour box girder webs：At the place of pouring, progress pours box girder webs, and it pours box girder formwork and is steel form, and
The all standing of steel form outer surface has insulation material, while insert thermometer in steel form insulation material, specifically the present embodiment
Middle step（1）In insulation material be rubber-plastic sponge, can be effectively by having insulation material in all standing of steel form outer surface
Avoid pouring that box beam internal-external temperature difference is larger, cause to pour the phenomenon that box beam cracks and occur；
Step（2）Pour box beam top board isothermal holding：Multi-layer heat preserving processing is carried out pouring box beam top board, specifically the present embodiment
Step（2）In multi-layer heat preserving be processed as first pouring box beam cover top surface sprinkling curing fluid, make its cover top surface shape
Into diaphragm, the geotextiles for reusing moistening are covered, and layer of plastic film is then covered again, and last all standing cotton-wadded quilt is carried out
Insulation, specifically the thickness of the geotextiles of the present embodiment is 3 mm ~ 4mm, what deserves to be explained is：The present embodiment is by pouring
Box beam cover top surface is sequentially provided with diaphragm, the geotextiles of moistening, layer of plastic film, cotton-wadded quilt, first with curing fluid
Diaphragm is conserved to pouring box beam top board, and the geotextiles for reusing moistening carry out moistening processing to pouring box beam top board, so
Moisturizing processing is carried out to pouring box beam top board using layer of plastic film afterwards, is protected finally by cotton-wadded quilt to pouring box beam top board
Temperature processing, the present embodiment is handled by maintenance, moisturizing, the combination of three aspects of insulation, is effectively guaranteed and is poured box beam top board
Quality, it is to avoid pour the appearance of crackle on box beam top board.
Thermometer is inserted in the cotton-wadded quilt for pouring box beam top board and multi-layer heat preserving, 35h ~ 40h guarantor is carried out to pouring box beam
Temperature processing, the present embodiment in steel form insulation material by inserting thermometer, and pours box beam top board and multi-layer heat preserving
Insertion thermometer in cotton-wadded quilt so that the temperature for pouring box beam and its top board can be in time monitored by thermometer, so as to
Take effective measures in time and carry out isothermal holding to pouring box beam and its top board, to ensure to pour box beam and its matter of top board
Amount, is prevented effectively from and pours box beam and its top board is cracked, while avoiding bringing delay to engineering construction and bringing unnecessary
Significant cost input；
Step（3）Match box beam：After pouring box beam intensity and reaching the 50% of design requirement, steel form thereon is removed, then will
Pour box beam and move to matched position, the matching box beam constructed as slug matching, and pouring place's repeat step（1）, step
（2）Operation make and new pour box beam；
Step（4）Match box beam isothermal holding：Matching box beam is put into stay-warm case, specifically the present embodiment step（4）Matching
In box beam isothermal holding, electric jet chimney is evenly arranged in matching box beam bottom and inner chamber, and uses air-locked waterproof cloth
It is used as the stay-warm case of matching box beam；
Steam insulation is carried out to matching box beam for 48KW electric steam boiler using rated power, and on the edge of a wing of matching box beam
The place suspension thermometer that steam does not reach in plate, inner chamber, when box beam intensity to be matched reaches the 80% of design requirement, will be passed through
Vapor (steam) temperature in stay-warm case diminishes step by step, finally turns off electric steam boiler；
Specifically the step of the present embodiment（4）Matching box beam isothermal holding includes heating, constant temperature, cooling three phases：
Temperature rise period：The temperature in stay-warm case is risen to 15 DEG C ~ 20 DEG C first in 40min ~ 50min, then 50min ~
The temperature in stay-warm case is risen to 25 DEG C ~ 30 DEG C in 70min；
The constant temperature stage：Matching box beam insulation is carried out using 80% ~ 90% relative humidity, 25 DEG C ~ 30 DEG C of temperature in stay-warm case,
Soaking time is 28 h ~ 32h；
Temperature-fall period：The temperature in stay-warm case is down to 15 DEG C ~ 20 DEG C first in 50min ~ 70min, then 40min ~
The temperature in stay-warm case is down to 4 DEG C ~ 5 DEG C in 50min.
What deserves to be explained is：The present embodiment is carried out at insulation by heating, constant temperature, cooling three phases to matching box beam
The reason and vapor (steam) temperature become step by step in big and stay-warm case by the vapor (steam) temperature in stay-warm case diminishes step by step, and by
Setting with the suitable programming rate of box beam, and cooling rate, it is final make it that matching box beam has good quality
Step（5）Match box beam lifting：After uniform temperature is reached in stay-warm case, stay-warm case is removed, and by matching box back
Multi-layer heat preserving processing on plate is removed, specific the present embodiment step（5）In after insulation case temperature be reduced to 4 DEG C ~ 5 DEG C after,
Stay-warm case is removed, and removes the isothermal holding on matching box back plate, the temperature of box beam to be matched reaches that room temperature is lifted by crane
Afterwards, the new box beam that pours is passed through into step（3）After move to matched position, the new matching box beam constructed as slug matching,
Subsequent repeat step（4）, step（5）, so as to complete the Maintenance in Winter of whole slug matching box girder construction.
The present embodiment carries out box girder construction by slug matching and carries out Maintenance in Winter to it, is reached when pouring box beam intensity
To after the 50% of design requirement, you can satisfaction will pour box beam and move to matched position, the matching box constructed as slug matching
Beam, and the matching box beam positioned at matched position now can have been met when meeting its intensity and reaching the 80% of design requirement
Requirement is hung, so the box beam that pours at cast matched position can be moved to, new constructed as slug matching
With box beam, and the new box beam that pours can be poured into a mould at cast, so as to which new is poured into box beam as box beam is matched, just
Box beam, the conversion of matching box beam mutual alignment are so poured, the present embodiment is exactly based on to be carried out rationally to pouring box beam, matching box beam
Isothermal holding, make to pour box beam, matching box beam just and meet the construction requirement of slug matching, while pouring the insulation of box beam
Processing procedure with match the isothermal holding process of box beam have in time it is good be connected, that is, pour box beam intensity and reach design
It is required that 50% when, matching box beam meets lifting requirement when its intensity reaches the 80% of design requirement just, and pours box beam
Maintenance is only needed to matching box beam 3 ~ 4 days, you can is met matching box beam lifting, is substantially increased the efficiency of construction of box beam, this mistake
Journey sets reasonable, the duration is saved, while ensure that the quality of box beam.
Claims (7)
1. a kind of Maintenance in Winter method of slug matching box girder construction, it is characterised in that：It is to match prefabricated box -beam in short-term
Maintenance process in pedestal,
Its step is as follows：
Step（1）Pour box girder webs：At the place of pouring, progress pours box girder webs, and it pours box girder formwork and is steel form, and
The all standing of steel form outer surface has insulation material, while inserting thermometer in steel form insulation material；
Step（2）Pour box beam top board isothermal holding：Multi-layer heat preserving processing is carried out pouring box beam top board, and in top board and multilayer
Insertion thermometer in the cotton-wadded quilt of insulation, 35h ~ 40h isothermal holding is carried out to pouring box beam；
Step（3）Match box beam：After pouring box beam intensity and reaching the 50% of design requirement, steel form thereon is removed, then will
Pour box beam and move to matched position, the matching box beam constructed as slug matching, and pouring place's repeat step（1）, step
（2）Operation make and new pour box beam；
Step（4）Match box beam isothermal holding：Matching box beam is put into stay-warm case, and utilizes electricity steaming of the rated power for 48KW
Boiler furnace carries out steam insulation, and the place suspension that steam does not reach in the matching flange plate of box beam, inner chamber to matching box beam
Thermometer, when box beam intensity to be matched reaches the 80% of design requirement, the vapor (steam) temperature being passed through in stay-warm case is diminished step by step, most
Electric steam boiler is turned off afterwards；
Step（5）Match box beam lifting：After uniform temperature is reached in stay-warm case, stay-warm case is removed, and by matching box back
Multi-layer heat preserving processing on plate is removed, after the temperature of box beam to be matched reaches that room temperature is lifted by crane, and the new box beam that pours is passed through
Step（3）After move to matched position, the new matching box beam constructed as slug matching, subsequent repeat step（4）, step
（5）, so as to complete the Maintenance in Winter of whole slug matching box girder construction.
2. a kind of Maintenance in Winter method of slug matching box girder construction according to claim 1, it is characterised in that：It is described
Step（1）In insulation material be rubber-plastic sponge.
3. a kind of Maintenance in Winter method of slug matching box girder construction according to claim 1, it is characterised in that：It is described
Step（2）In multi-layer heat preserving be processed as first pouring box beam cover top surface sprinkling curing fluid, make its cover top surface shape
Into diaphragm, the geotextiles for reusing moistening are covered, and layer of plastic film is then covered again, and last all standing cotton-wadded quilt is carried out
Insulation.
4. a kind of Maintenance in Winter method of slug matching box girder construction according to claim 3, it is characterised in that：It is described
Step（2）The thickness of middle geotextiles is 3 mm ~ 4mm.
5. a kind of Maintenance in Winter method of slug matching box girder construction according to claim 1, it is characterised in that：It is described
Step（4）Match in box beam isothermal holding, electric jet chimney is evenly arranged in matching box beam bottom and inner chamber, and using not
Ventilative waterproof cloth is used as the stay-warm case for matching box beam.
6. a kind of Maintenance in Winter method of slug matching box girder construction according to claim 5, it is characterised in that：It is described
Step（4）Matching box beam isothermal holding includes heating, constant temperature, cooling three phases：
Temperature rise period：The temperature in stay-warm case is risen to 15 DEG C ~ 20 DEG C first in 40min ~ 50min, then 50min ~
The temperature in stay-warm case is risen to 25 DEG C ~ 30 DEG C in 70min；
The constant temperature stage：Matching box beam insulation is carried out using 80% ~ 90% relative humidity, 25 DEG C ~ 30 DEG C of temperature in stay-warm case,
Soaking time is 28 h ~ 32h；
Temperature-fall period：The temperature in stay-warm case is down to 15 DEG C ~ 20 DEG C first in 50min ~ 70min, then 40min ~
The temperature in stay-warm case is down to 4 DEG C ~ 5 DEG C in 50min.
7. a kind of Maintenance in Winter method of slug matching box girder construction according to claim 6, it is characterised in that：Step
（5）In after insulation case temperature be reduced to 4 DEG C ~ 5 DEG C after, stay-warm case is removed, and removes at the insulation on matching box back plate
Reason.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112854748A (en) * | 2021-03-10 | 2021-05-28 | 中铁二十局集团第六工程有限公司 | Maintenance method for construction of suspension casting box girder in winter |
| CN113463934A (en) * | 2021-07-20 | 2021-10-01 | 江西省交通工程集团建设有限公司 | Temperature-control anti-cracking curing method for mass concrete |
| CN114855569A (en) * | 2022-05-20 | 2022-08-05 | 山西机械化建设集团有限公司 | Low-temperature health preserving method for airport pavement concrete in plateau area by distributing two concrete layers and one concrete layer |
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| CN112854748A (en) * | 2021-03-10 | 2021-05-28 | 中铁二十局集团第六工程有限公司 | Maintenance method for construction of suspension casting box girder in winter |
| CN113463934A (en) * | 2021-07-20 | 2021-10-01 | 江西省交通工程集团建设有限公司 | Temperature-control anti-cracking curing method for mass concrete |
| CN114855569A (en) * | 2022-05-20 | 2022-08-05 | 山西机械化建设集团有限公司 | Low-temperature health preserving method for airport pavement concrete in plateau area by distributing two concrete layers and one concrete layer |
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|---|---|
| CN106939555B (en) | 2019-01-25 |
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